|
- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
- /* ====================================================================
- * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
- /* ====================================================================
- * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
- * ECC cipher suite support in OpenSSL originally developed by
- * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
- */
- /* ====================================================================
- * Copyright 2005 Nokia. All rights reserved.
- *
- * The portions of the attached software ("Contribution") is developed by
- * Nokia Corporation and is licensed pursuant to the OpenSSL open source
- * license.
- *
- * The Contribution, originally written by Mika Kousa and Pasi Eronen of
- * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
- * support (see RFC 4279) to OpenSSL.
- *
- * No patent licenses or other rights except those expressly stated in
- * the OpenSSL open source license shall be deemed granted or received
- * expressly, by implication, estoppel, or otherwise.
- *
- * No assurances are provided by Nokia that the Contribution does not
- * infringe the patent or other intellectual property rights of any third
- * party or that the license provides you with all the necessary rights
- * to make use of the Contribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
- * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
- * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
- * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
- * OTHERWISE.
- */
-
- #ifndef OPENSSL_HEADER_SSL_INTERNAL_H
- #define OPENSSL_HEADER_SSL_INTERNAL_H
-
- #include <openssl/base.h>
-
- #include <stdlib.h>
-
- #include <limits>
- #include <new>
- #include <type_traits>
- #include <utility>
-
- #include <openssl/aead.h>
- #include <openssl/err.h>
- #include <openssl/lhash.h>
- #include <openssl/mem.h>
- #include <openssl/ssl.h>
- #include <openssl/span.h>
- #include <openssl/stack.h>
-
- #include "../crypto/err/internal.h"
- #include "../crypto/internal.h"
-
-
- #if defined(OPENSSL_WINDOWS)
- // Windows defines struct timeval in winsock2.h.
- OPENSSL_MSVC_PRAGMA(warning(push, 3))
- #include <winsock2.h>
- OPENSSL_MSVC_PRAGMA(warning(pop))
- #else
- #include <sys/time.h>
- #endif
-
-
- namespace bssl {
-
- struct SSL_CONFIG;
- struct SSL_HANDSHAKE;
- struct SSL_PROTOCOL_METHOD;
- struct SSL_X509_METHOD;
-
- // C++ utilities.
-
- // New behaves like |new| but uses |OPENSSL_malloc| for memory allocation. It
- // returns nullptr on allocation error. It only implements single-object
- // allocation and not new T[n].
- //
- // Note: unlike |new|, this does not support non-public constructors.
- template <typename T, typename... Args>
- T *New(Args &&... args) {
- void *t = OPENSSL_malloc(sizeof(T));
- if (t == nullptr) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return nullptr;
- }
- return new (t) T(std::forward<Args>(args)...);
- }
-
- // Delete behaves like |delete| but uses |OPENSSL_free| to release memory.
- //
- // Note: unlike |delete| this does not support non-public destructors.
- template <typename T>
- void Delete(T *t) {
- if (t != nullptr) {
- t->~T();
- OPENSSL_free(t);
- }
- }
-
- // All types with kAllowUniquePtr set may be used with UniquePtr. Other types
- // may be C structs which require a |BORINGSSL_MAKE_DELETER| registration.
- namespace internal {
- template <typename T>
- struct DeleterImpl<T, typename std::enable_if<T::kAllowUniquePtr>::type> {
- static void Free(T *t) { Delete(t); }
- };
- }
-
- // MakeUnique behaves like |std::make_unique| but returns nullptr on allocation
- // error.
- template <typename T, typename... Args>
- UniquePtr<T> MakeUnique(Args &&... args) {
- return UniquePtr<T>(New<T>(std::forward<Args>(args)...));
- }
-
- #if defined(BORINGSSL_ALLOW_CXX_RUNTIME)
- #define HAS_VIRTUAL_DESTRUCTOR
- #define PURE_VIRTUAL = 0
- #else
- // HAS_VIRTUAL_DESTRUCTOR should be declared in any base class which defines a
- // virtual destructor. This avoids a dependency on |_ZdlPv| and prevents the
- // class from being used with |delete|.
- #define HAS_VIRTUAL_DESTRUCTOR \
- void operator delete(void *) { abort(); }
-
- // PURE_VIRTUAL should be used instead of = 0 when defining pure-virtual
- // functions. This avoids a dependency on |__cxa_pure_virtual| but loses
- // compile-time checking.
- #define PURE_VIRTUAL { abort(); }
- #endif
-
- // CONSTEXPR_ARRAY works around a VS 2015 bug where ranged for loops don't work
- // on constexpr arrays.
- #if defined(_MSC_VER) && !defined(__clang__) && _MSC_VER < 1910
- #define CONSTEXPR_ARRAY const
- #else
- #define CONSTEXPR_ARRAY constexpr
- #endif
-
- // Array<T> is an owning array of elements of |T|.
- template <typename T>
- class Array {
- public:
- // Array's default constructor creates an empty array.
- Array() {}
- Array(const Array &) = delete;
- Array(Array &&other) { *this = std::move(other); }
-
- ~Array() { Reset(); }
-
- Array &operator=(const Array &) = delete;
- Array &operator=(Array &&other) {
- Reset();
- other.Release(&data_, &size_);
- return *this;
- }
-
- const T *data() const { return data_; }
- T *data() { return data_; }
- size_t size() const { return size_; }
- bool empty() const { return size_ == 0; }
-
- const T &operator[](size_t i) const { return data_[i]; }
- T &operator[](size_t i) { return data_[i]; }
-
- T *begin() { return data_; }
- const T *cbegin() const { return data_; }
- T *end() { return data_ + size_; }
- const T *cend() const { return data_ + size_; }
-
- void Reset() { Reset(nullptr, 0); }
-
- // Reset releases the current contents of the array and takes ownership of the
- // raw pointer supplied by the caller.
- void Reset(T *new_data, size_t new_size) {
- for (size_t i = 0; i < size_; i++) {
- data_[i].~T();
- }
- OPENSSL_free(data_);
- data_ = new_data;
- size_ = new_size;
- }
-
- // Release releases ownership of the array to a raw pointer supplied by the
- // caller.
- void Release(T **out, size_t *out_size) {
- *out = data_;
- *out_size = size_;
- data_ = nullptr;
- size_ = 0;
- }
-
- // Init replaces the array with a newly-allocated array of |new_size|
- // default-constructed copies of |T|. It returns true on success and false on
- // error.
- //
- // Note that if |T| is a primitive type like |uint8_t|, it is uninitialized.
- bool Init(size_t new_size) {
- Reset();
- if (new_size == 0) {
- return true;
- }
-
- if (new_size > std::numeric_limits<size_t>::max() / sizeof(T)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return false;
- }
- data_ = reinterpret_cast<T*>(OPENSSL_malloc(new_size * sizeof(T)));
- if (data_ == nullptr) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return false;
- }
- size_ = new_size;
- for (size_t i = 0; i < size_; i++) {
- new (&data_[i]) T;
- }
- return true;
- }
-
- // CopyFrom replaces the array with a newly-allocated copy of |in|. It returns
- // true on success and false on error.
- bool CopyFrom(Span<const T> in) {
- if (!Init(in.size())) {
- return false;
- }
- OPENSSL_memcpy(data_, in.data(), sizeof(T) * in.size());
- return true;
- }
-
- private:
- T *data_ = nullptr;
- size_t size_ = 0;
- };
-
- // CBBFinishArray behaves like |CBB_finish| but stores the result in an Array.
- OPENSSL_EXPORT bool CBBFinishArray(CBB *cbb, Array<uint8_t> *out);
-
-
- // Protocol versions.
- //
- // Due to DTLS's historical wire version differences and to support multiple
- // variants of the same protocol during development, we maintain two notions of
- // version.
- //
- // The "version" or "wire version" is the actual 16-bit value that appears on
- // the wire. It uniquely identifies a version and is also used at API
- // boundaries. The set of supported versions differs between TLS and DTLS. Wire
- // versions are opaque values and may not be compared numerically.
- //
- // The "protocol version" identifies the high-level handshake variant being
- // used. DTLS versions map to the corresponding TLS versions. Draft TLS 1.3
- // variants all map to TLS 1.3. Protocol versions are sequential and may be
- // compared numerically.
-
- // ssl_protocol_version_from_wire sets |*out| to the protocol version
- // corresponding to wire version |version| and returns true. If |version| is not
- // a valid TLS or DTLS version, it returns false.
- //
- // Note this simultaneously handles both DTLS and TLS. Use one of the
- // higher-level functions below for most operations.
- bool ssl_protocol_version_from_wire(uint16_t *out, uint16_t version);
-
- // ssl_get_version_range sets |*out_min_version| and |*out_max_version| to the
- // minimum and maximum enabled protocol versions, respectively.
- bool ssl_get_version_range(const SSL_HANDSHAKE *hs, uint16_t *out_min_version,
- uint16_t *out_max_version);
-
- // ssl_supports_version returns whether |hs| supports |version|.
- bool ssl_supports_version(SSL_HANDSHAKE *hs, uint16_t version);
-
- // ssl_method_supports_version returns whether |method| supports |version|.
- bool ssl_method_supports_version(const SSL_PROTOCOL_METHOD *method,
- uint16_t version);
-
- // ssl_add_supported_versions writes the supported versions of |hs| to |cbb|, in
- // decreasing preference order.
- bool ssl_add_supported_versions(SSL_HANDSHAKE *hs, CBB *cbb);
-
- // ssl_negotiate_version negotiates a common version based on |hs|'s preferences
- // and the peer preference list in |peer_versions|. On success, it returns true
- // and sets |*out_version| to the selected version. Otherwise, it returns false
- // and sets |*out_alert| to an alert to send.
- bool ssl_negotiate_version(SSL_HANDSHAKE *hs, uint8_t *out_alert,
- uint16_t *out_version, const CBS *peer_versions);
-
- // ssl_protocol_version returns |ssl|'s protocol version. It is an error to
- // call this function before the version is determined.
- uint16_t ssl_protocol_version(const SSL *ssl);
-
- // ssl_is_draft28 returns whether the version corresponds to a draft28 TLS 1.3
- // variant.
- bool ssl_is_draft28(uint16_t version);
-
- // Cipher suites.
-
- } // namespace bssl
-
- struct ssl_cipher_st {
- // name is the OpenSSL name for the cipher.
- const char *name;
- // standard_name is the IETF name for the cipher.
- const char *standard_name;
- // id is the cipher suite value bitwise OR-d with 0x03000000.
- uint32_t id;
-
- // algorithm_* determine the cipher suite. See constants below for the values.
- uint32_t algorithm_mkey;
- uint32_t algorithm_auth;
- uint32_t algorithm_enc;
- uint32_t algorithm_mac;
- uint32_t algorithm_prf;
- };
-
- namespace bssl {
-
- // Bits for |algorithm_mkey| (key exchange algorithm).
- #define SSL_kRSA 0x00000001u
- #define SSL_kECDHE 0x00000002u
- // SSL_kPSK is only set for plain PSK, not ECDHE_PSK.
- #define SSL_kPSK 0x00000004u
- #define SSL_kGENERIC 0x00000008u
-
- // Bits for |algorithm_auth| (server authentication).
- #define SSL_aRSA 0x00000001u
- #define SSL_aECDSA 0x00000002u
- // SSL_aPSK is set for both PSK and ECDHE_PSK.
- #define SSL_aPSK 0x00000004u
- #define SSL_aGENERIC 0x00000008u
-
- #define SSL_aCERT (SSL_aRSA | SSL_aECDSA)
-
- // Bits for |algorithm_enc| (symmetric encryption).
- #define SSL_3DES 0x00000001u
- #define SSL_AES128 0x00000002u
- #define SSL_AES256 0x00000004u
- #define SSL_AES128GCM 0x00000008u
- #define SSL_AES256GCM 0x00000010u
- #define SSL_eNULL 0x00000020u
- #define SSL_CHACHA20POLY1305 0x00000040u
-
- #define SSL_AES (SSL_AES128 | SSL_AES256 | SSL_AES128GCM | SSL_AES256GCM)
-
- // Bits for |algorithm_mac| (symmetric authentication).
- #define SSL_SHA1 0x00000001u
- // SSL_AEAD is set for all AEADs.
- #define SSL_AEAD 0x00000002u
-
- // Bits for |algorithm_prf| (handshake digest).
- #define SSL_HANDSHAKE_MAC_DEFAULT 0x1
- #define SSL_HANDSHAKE_MAC_SHA256 0x2
- #define SSL_HANDSHAKE_MAC_SHA384 0x4
-
- // An SSLCipherPreferenceList contains a list of SSL_CIPHERs with equal-
- // preference groups. For TLS clients, the groups are moot because the server
- // picks the cipher and groups cannot be expressed on the wire. However, for
- // servers, the equal-preference groups allow the client's preferences to be
- // partially respected. (This only has an effect with
- // SSL_OP_CIPHER_SERVER_PREFERENCE).
- //
- // The equal-preference groups are expressed by grouping SSL_CIPHERs together.
- // All elements of a group have the same priority: no ordering is expressed
- // within a group.
- //
- // The values in |ciphers| are in one-to-one correspondence with
- // |in_group_flags|. (That is, sk_SSL_CIPHER_num(ciphers) is the number of
- // bytes in |in_group_flags|.) The bytes in |in_group_flags| are either 1, to
- // indicate that the corresponding SSL_CIPHER is not the last element of a
- // group, or 0 to indicate that it is.
- //
- // For example, if |in_group_flags| contains all zeros then that indicates a
- // traditional, fully-ordered preference. Every SSL_CIPHER is the last element
- // of the group (i.e. they are all in a one-element group).
- //
- // For a more complex example, consider:
- // ciphers: A B C D E F
- // in_group_flags: 1 1 0 0 1 0
- //
- // That would express the following, order:
- //
- // A E
- // B -> D -> F
- // C
- struct SSLCipherPreferenceList {
- static constexpr bool kAllowUniquePtr = true;
-
- SSLCipherPreferenceList() = default;
- ~SSLCipherPreferenceList();
-
- bool Init(UniquePtr<STACK_OF(SSL_CIPHER)> ciphers,
- Span<const bool> in_group_flags);
-
- UniquePtr<STACK_OF(SSL_CIPHER)> ciphers;
- bool *in_group_flags = nullptr;
- };
-
- // ssl_cipher_get_evp_aead sets |*out_aead| to point to the correct EVP_AEAD
- // object for |cipher| protocol version |version|. It sets |*out_mac_secret_len|
- // and |*out_fixed_iv_len| to the MAC key length and fixed IV length,
- // respectively. The MAC key length is zero except for legacy block and stream
- // ciphers. It returns true on success and false on error.
- bool ssl_cipher_get_evp_aead(const EVP_AEAD **out_aead,
- size_t *out_mac_secret_len,
- size_t *out_fixed_iv_len, const SSL_CIPHER *cipher,
- uint16_t version, int is_dtls);
-
- // ssl_get_handshake_digest returns the |EVP_MD| corresponding to |version| and
- // |cipher|.
- const EVP_MD *ssl_get_handshake_digest(uint16_t version,
- const SSL_CIPHER *cipher);
-
- // ssl_create_cipher_list evaluates |rule_str|. It sets |*out_cipher_list| to a
- // newly-allocated |SSLCipherPreferenceList| containing the result. It returns
- // true on success and false on failure. If |strict| is true, nonsense will be
- // rejected. If false, nonsense will be silently ignored. An empty result is
- // considered an error regardless of |strict|.
- bool ssl_create_cipher_list(UniquePtr<SSLCipherPreferenceList> *out_cipher_list,
- const char *rule_str, bool strict);
-
- // ssl_cipher_get_value returns the cipher suite id of |cipher|.
- uint16_t ssl_cipher_get_value(const SSL_CIPHER *cipher);
-
- // ssl_cipher_auth_mask_for_key returns the mask of cipher |algorithm_auth|
- // values suitable for use with |key| in TLS 1.2 and below.
- uint32_t ssl_cipher_auth_mask_for_key(const EVP_PKEY *key);
-
- // ssl_cipher_uses_certificate_auth returns whether |cipher| authenticates the
- // server and, optionally, the client with a certificate.
- bool ssl_cipher_uses_certificate_auth(const SSL_CIPHER *cipher);
-
- // ssl_cipher_requires_server_key_exchange returns whether |cipher| requires a
- // ServerKeyExchange message.
- //
- // This function may return false while still allowing |cipher| an optional
- // ServerKeyExchange. This is the case for plain PSK ciphers.
- bool ssl_cipher_requires_server_key_exchange(const SSL_CIPHER *cipher);
-
- // ssl_cipher_get_record_split_len, for TLS 1.0 CBC mode ciphers, returns the
- // length of an encrypted 1-byte record, for use in record-splitting. Otherwise
- // it returns zero.
- size_t ssl_cipher_get_record_split_len(const SSL_CIPHER *cipher);
-
-
- // Transcript layer.
-
- // SSLTranscript maintains the handshake transcript as a combination of a
- // buffer and running hash.
- class SSLTranscript {
- public:
- SSLTranscript();
- ~SSLTranscript();
-
- // Init initializes the handshake transcript. If called on an existing
- // transcript, it resets the transcript and hash. It returns true on success
- // and false on failure.
- bool Init();
-
- // InitHash initializes the handshake hash based on the PRF and contents of
- // the handshake transcript. Subsequent calls to |Update| will update the
- // rolling hash. It returns one on success and zero on failure. It is an error
- // to call this function after the handshake buffer is released.
- bool InitHash(uint16_t version, const SSL_CIPHER *cipher);
-
- // UpdateForHelloRetryRequest resets the rolling hash with the
- // HelloRetryRequest construction. It returns true on success and false on
- // failure. It is an error to call this function before the handshake buffer
- // is released.
- bool UpdateForHelloRetryRequest();
-
- // CopyHashContext copies the hash context into |ctx| and returns true on
- // success.
- bool CopyHashContext(EVP_MD_CTX *ctx);
-
- Span<const uint8_t> buffer() {
- return MakeConstSpan(reinterpret_cast<const uint8_t *>(buffer_->data),
- buffer_->length);
- }
-
- // FreeBuffer releases the handshake buffer. Subsequent calls to
- // |Update| will not update the handshake buffer.
- void FreeBuffer();
-
- // DigestLen returns the length of the PRF hash.
- size_t DigestLen() const;
-
- // Digest returns the PRF hash. For TLS 1.1 and below, this is
- // |EVP_md5_sha1|.
- const EVP_MD *Digest() const;
-
- // Update adds |in| to the handshake buffer and handshake hash, whichever is
- // enabled. It returns true on success and false on failure.
- bool Update(Span<const uint8_t> in);
-
- // GetHash writes the handshake hash to |out| which must have room for at
- // least |DigestLen| bytes. On success, it returns true and sets |*out_len| to
- // the number of bytes written. Otherwise, it returns false.
- bool GetHash(uint8_t *out, size_t *out_len);
-
- // GetFinishedMAC computes the MAC for the Finished message into the bytes
- // pointed by |out| and writes the number of bytes to |*out_len|. |out| must
- // have room for |EVP_MAX_MD_SIZE| bytes. It returns true on success and false
- // on failure.
- bool GetFinishedMAC(uint8_t *out, size_t *out_len, const SSL_SESSION *session,
- bool from_server);
-
- private:
- // buffer_, if non-null, contains the handshake transcript.
- UniquePtr<BUF_MEM> buffer_;
- // hash, if initialized with an |EVP_MD|, maintains the handshake hash.
- ScopedEVP_MD_CTX hash_;
- };
-
- // tls1_prf computes the PRF function for |ssl|. It fills |out|, using |secret|
- // as the secret and |label| as the label. |seed1| and |seed2| are concatenated
- // to form the seed parameter. It returns true on success and false on failure.
- bool tls1_prf(const EVP_MD *digest, Span<uint8_t> out,
- Span<const uint8_t> secret, Span<const char> label,
- Span<const uint8_t> seed1, Span<const uint8_t> seed2);
-
-
- // Encryption layer.
-
- // SSLAEADContext contains information about an AEAD that is being used to
- // encrypt an SSL connection.
- class SSLAEADContext {
- public:
- SSLAEADContext(uint16_t version, bool is_dtls, const SSL_CIPHER *cipher);
- ~SSLAEADContext();
- static constexpr bool kAllowUniquePtr = true;
-
- SSLAEADContext(const SSLAEADContext &&) = delete;
- SSLAEADContext &operator=(const SSLAEADContext &&) = delete;
-
- // CreateNullCipher creates an |SSLAEADContext| for the null cipher.
- static UniquePtr<SSLAEADContext> CreateNullCipher(bool is_dtls);
-
- // Create creates an |SSLAEADContext| using the supplied key material. It
- // returns nullptr on error. Only one of |Open| or |Seal| may be used with the
- // resulting object, depending on |direction|. |version| is the normalized
- // protocol version, so DTLS 1.0 is represented as 0x0301, not 0xffef.
- static UniquePtr<SSLAEADContext> Create(enum evp_aead_direction_t direction,
- uint16_t version, int is_dtls,
- const SSL_CIPHER *cipher,
- Span<const uint8_t> enc_key,
- Span<const uint8_t> mac_key,
- Span<const uint8_t> fixed_iv);
-
- // SetVersionIfNullCipher sets the version the SSLAEADContext for the null
- // cipher, to make version-specific determinations in the record layer prior
- // to a cipher being selected.
- void SetVersionIfNullCipher(uint16_t version);
-
- // ProtocolVersion returns the protocol version associated with this
- // SSLAEADContext. It can only be called once |version_| has been set to a
- // valid value.
- uint16_t ProtocolVersion() const;
-
- // RecordVersion returns the record version that should be used with this
- // SSLAEADContext for record construction and crypto.
- uint16_t RecordVersion() const;
-
- const SSL_CIPHER *cipher() const { return cipher_; }
-
- // is_null_cipher returns true if this is the null cipher.
- bool is_null_cipher() const { return !cipher_; }
-
- // ExplicitNonceLen returns the length of the explicit nonce.
- size_t ExplicitNonceLen() const;
-
- // MaxOverhead returns the maximum overhead of calling |Seal|.
- size_t MaxOverhead() const;
-
- // SuffixLen calculates the suffix length written by |SealScatter| and writes
- // it to |*out_suffix_len|. It returns true on success and false on error.
- // |in_len| and |extra_in_len| should equal the argument of the same names
- // passed to |SealScatter|.
- bool SuffixLen(size_t *out_suffix_len, size_t in_len,
- size_t extra_in_len) const;
-
- // CiphertextLen calculates the total ciphertext length written by
- // |SealScatter| and writes it to |*out_len|. It returns true on success and
- // false on error. |in_len| and |extra_in_len| should equal the argument of
- // the same names passed to |SealScatter|.
- bool CiphertextLen(size_t *out_len, size_t in_len, size_t extra_in_len) const;
-
- // Open authenticates and decrypts |in| in-place. On success, it sets |*out|
- // to the plaintext in |in| and returns true. Otherwise, it returns
- // false. The output will always be |ExplicitNonceLen| bytes ahead of |in|.
- bool Open(Span<uint8_t> *out, uint8_t type, uint16_t record_version,
- const uint8_t seqnum[8], Span<const uint8_t> header,
- Span<uint8_t> in);
-
- // Seal encrypts and authenticates |in_len| bytes from |in| and writes the
- // result to |out|. It returns true on success and false on error.
- //
- // If |in| and |out| alias then |out| + |ExplicitNonceLen| must be == |in|.
- bool Seal(uint8_t *out, size_t *out_len, size_t max_out, uint8_t type,
- uint16_t record_version, const uint8_t seqnum[8],
- Span<const uint8_t> header, const uint8_t *in, size_t in_len);
-
- // SealScatter encrypts and authenticates |in_len| bytes from |in| and splits
- // the result between |out_prefix|, |out| and |out_suffix|. It returns one on
- // success and zero on error.
- //
- // On successful return, exactly |ExplicitNonceLen| bytes are written to
- // |out_prefix|, |in_len| bytes to |out|, and |SuffixLen| bytes to
- // |out_suffix|.
- //
- // |extra_in| may point to an additional plaintext buffer. If present,
- // |extra_in_len| additional bytes are encrypted and authenticated, and the
- // ciphertext is written to the beginning of |out_suffix|. |SuffixLen| should
- // be used to size |out_suffix| accordingly.
- //
- // If |in| and |out| alias then |out| must be == |in|. Other arguments may not
- // alias anything.
- bool SealScatter(uint8_t *out_prefix, uint8_t *out, uint8_t *out_suffix,
- uint8_t type, uint16_t record_version,
- const uint8_t seqnum[8], Span<const uint8_t> header,
- const uint8_t *in, size_t in_len, const uint8_t *extra_in,
- size_t extra_in_len);
-
- bool GetIV(const uint8_t **out_iv, size_t *out_iv_len) const;
-
- private:
- // GetAdditionalData returns the additional data, writing into |storage| if
- // necessary.
- Span<const uint8_t> GetAdditionalData(uint8_t storage[13], uint8_t type,
- uint16_t record_version,
- const uint8_t seqnum[8],
- size_t plaintext_len,
- Span<const uint8_t> header);
-
- const SSL_CIPHER *cipher_;
- ScopedEVP_AEAD_CTX ctx_;
- // fixed_nonce_ contains any bytes of the nonce that are fixed for all
- // records.
- uint8_t fixed_nonce_[12];
- uint8_t fixed_nonce_len_ = 0, variable_nonce_len_ = 0;
- // version_ is the wire version that should be used with this AEAD.
- uint16_t version_;
- // is_dtls_ is whether DTLS is being used with this AEAD.
- bool is_dtls_;
- // variable_nonce_included_in_record_ is true if the variable nonce
- // for a record is included as a prefix before the ciphertext.
- bool variable_nonce_included_in_record_ : 1;
- // random_variable_nonce_ is true if the variable nonce is
- // randomly generated, rather than derived from the sequence
- // number.
- bool random_variable_nonce_ : 1;
- // xor_fixed_nonce_ is true if the fixed nonce should be XOR'd into the
- // variable nonce rather than prepended.
- bool xor_fixed_nonce_ : 1;
- // omit_length_in_ad_ is true if the length should be omitted in the
- // AEAD's ad parameter.
- bool omit_length_in_ad_ : 1;
- // omit_ad_ is true if the AEAD's ad parameter should be omitted.
- bool omit_ad_ : 1;
- // ad_is_header_ is true if the AEAD's ad parameter is the record header.
- bool ad_is_header_ : 1;
- };
-
-
- // DTLS replay bitmap.
-
- // DTLS1_BITMAP maintains a sliding window of 64 sequence numbers to detect
- // replayed packets. It should be initialized by zeroing every field.
- struct DTLS1_BITMAP {
- // map is a bit mask of the last 64 sequence numbers. Bit
- // |1<<i| corresponds to |max_seq_num - i|.
- uint64_t map = 0;
- // max_seq_num is the largest sequence number seen so far as a 64-bit
- // integer.
- uint64_t max_seq_num = 0;
- };
-
-
- // Record layer.
-
- // ssl_record_sequence_update increments the sequence number in |seq|. It
- // returns one on success and zero on wraparound.
- int ssl_record_sequence_update(uint8_t *seq, size_t seq_len);
-
- // ssl_record_prefix_len returns the length of the prefix before the ciphertext
- // of a record for |ssl|.
- //
- // TODO(davidben): Expose this as part of public API once the high-level
- // buffer-free APIs are available.
- size_t ssl_record_prefix_len(const SSL *ssl);
-
- enum ssl_open_record_t {
- ssl_open_record_success,
- ssl_open_record_discard,
- ssl_open_record_partial,
- ssl_open_record_close_notify,
- ssl_open_record_error,
- };
-
- // tls_open_record decrypts a record from |in| in-place.
- //
- // If the input did not contain a complete record, it returns
- // |ssl_open_record_partial|. It sets |*out_consumed| to the total number of
- // bytes necessary. It is guaranteed that a successful call to |tls_open_record|
- // will consume at least that many bytes.
- //
- // Otherwise, it sets |*out_consumed| to the number of bytes of input
- // consumed. Note that input may be consumed on all return codes if a record was
- // decrypted.
- //
- // On success, it returns |ssl_open_record_success|. It sets |*out_type| to the
- // record type and |*out| to the record body in |in|. Note that |*out| may be
- // empty.
- //
- // If a record was successfully processed but should be discarded, it returns
- // |ssl_open_record_discard|.
- //
- // If a record was successfully processed but is a close_notify, it returns
- // |ssl_open_record_close_notify|.
- //
- // On failure or fatal alert, it returns |ssl_open_record_error| and sets
- // |*out_alert| to an alert to emit, or zero if no alert should be emitted.
- enum ssl_open_record_t tls_open_record(SSL *ssl, uint8_t *out_type,
- Span<uint8_t> *out, size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
-
- // dtls_open_record implements |tls_open_record| for DTLS. It only returns
- // |ssl_open_record_partial| if |in| was empty and sets |*out_consumed| to
- // zero. The caller should read one packet and try again.
- enum ssl_open_record_t dtls_open_record(SSL *ssl, uint8_t *out_type,
- Span<uint8_t> *out,
- size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
-
- // ssl_seal_align_prefix_len returns the length of the prefix before the start
- // of the bulk of the ciphertext when sealing a record with |ssl|. Callers may
- // use this to align buffers.
- //
- // Note when TLS 1.0 CBC record-splitting is enabled, this includes the one byte
- // record and is the offset into second record's ciphertext. Thus sealing a
- // small record may result in a smaller output than this value.
- //
- // TODO(davidben): Is this alignment valuable? Record-splitting makes this a
- // mess.
- size_t ssl_seal_align_prefix_len(const SSL *ssl);
-
- // tls_seal_record seals a new record of type |type| and body |in| and writes it
- // to |out|. At most |max_out| bytes will be written. It returns one on success
- // and zero on error. If enabled, |tls_seal_record| implements TLS 1.0 CBC 1/n-1
- // record splitting and may write two records concatenated.
- //
- // For a large record, the bulk of the ciphertext will begin
- // |ssl_seal_align_prefix_len| bytes into out. Aligning |out| appropriately may
- // improve performance. It writes at most |in_len| + |SSL_max_seal_overhead|
- // bytes to |out|.
- //
- // |in| and |out| may not alias.
- int tls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
- uint8_t type, const uint8_t *in, size_t in_len);
-
- enum dtls1_use_epoch_t {
- dtls1_use_previous_epoch,
- dtls1_use_current_epoch,
- };
-
- // dtls_max_seal_overhead returns the maximum overhead, in bytes, of sealing a
- // record.
- size_t dtls_max_seal_overhead(const SSL *ssl, enum dtls1_use_epoch_t use_epoch);
-
- // dtls_seal_prefix_len returns the number of bytes of prefix to reserve in
- // front of the plaintext when sealing a record in-place.
- size_t dtls_seal_prefix_len(const SSL *ssl, enum dtls1_use_epoch_t use_epoch);
-
- // dtls_seal_record implements |tls_seal_record| for DTLS. |use_epoch| selects
- // which epoch's cipher state to use. Unlike |tls_seal_record|, |in| and |out|
- // may alias but, if they do, |in| must be exactly |dtls_seal_prefix_len| bytes
- // ahead of |out|.
- int dtls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
- uint8_t type, const uint8_t *in, size_t in_len,
- enum dtls1_use_epoch_t use_epoch);
-
- // ssl_process_alert processes |in| as an alert and updates |ssl|'s shutdown
- // state. It returns one of |ssl_open_record_discard|, |ssl_open_record_error|,
- // |ssl_open_record_close_notify|, or |ssl_open_record_fatal_alert| as
- // appropriate.
- enum ssl_open_record_t ssl_process_alert(SSL *ssl, uint8_t *out_alert,
- Span<const uint8_t> in);
-
-
- // Private key operations.
-
- // ssl_has_private_key returns one if |cfg| has a private key configured and
- // zero otherwise.
- int ssl_has_private_key(const SSL_CONFIG *cfg);
-
- // ssl_private_key_* perform the corresponding operation on
- // |SSL_PRIVATE_KEY_METHOD|. If there is a custom private key configured, they
- // call the corresponding function or |complete| depending on whether there is a
- // pending operation. Otherwise, they implement the operation with
- // |EVP_PKEY|.
-
- enum ssl_private_key_result_t ssl_private_key_sign(
- SSL_HANDSHAKE *hs, uint8_t *out, size_t *out_len, size_t max_out,
- uint16_t sigalg, Span<const uint8_t> in);
-
- enum ssl_private_key_result_t ssl_private_key_decrypt(SSL_HANDSHAKE *hs,
- uint8_t *out,
- size_t *out_len,
- size_t max_out,
- Span<const uint8_t> in);
-
- // ssl_private_key_supports_signature_algorithm returns whether |hs|'s private
- // key supports |sigalg|.
- bool ssl_private_key_supports_signature_algorithm(SSL_HANDSHAKE *hs,
- uint16_t sigalg);
-
- // ssl_public_key_verify verifies that the |signature| is valid for the public
- // key |pkey| and input |in|, using the signature algorithm |sigalg|.
- bool ssl_public_key_verify(SSL *ssl, Span<const uint8_t> signature,
- uint16_t sigalg, EVP_PKEY *pkey,
- Span<const uint8_t> in);
-
-
- // Key shares.
-
- // SSLKeyShare abstracts over Diffie-Hellman-like key exchanges.
- class SSLKeyShare {
- public:
- virtual ~SSLKeyShare() {}
- static constexpr bool kAllowUniquePtr = true;
- HAS_VIRTUAL_DESTRUCTOR
-
- // Create returns a SSLKeyShare instance for use with group |group_id| or
- // nullptr on error.
- static UniquePtr<SSLKeyShare> Create(uint16_t group_id);
-
- // Create deserializes an SSLKeyShare instance previously serialized by
- // |Serialize|.
- static UniquePtr<SSLKeyShare> Create(CBS *in);
-
- // GroupID returns the group ID.
- virtual uint16_t GroupID() const PURE_VIRTUAL;
-
- // Offer generates a keypair and writes the public value to
- // |out_public_key|. It returns true on success and false on error.
- virtual bool Offer(CBB *out_public_key) PURE_VIRTUAL;
-
- // Accept performs a key exchange against the |peer_key| generated by |offer|.
- // On success, it returns true, writes the public value to |out_public_key|,
- // and sets |*out_secret| the shared secret. On failure, it returns false and
- // sets |*out_alert| to an alert to send to the peer.
- //
- // The default implementation calls |Offer| and then |Finish|, assuming a key
- // exchange protocol where the peers are symmetric.
- virtual bool Accept(CBB *out_public_key, Array<uint8_t> *out_secret,
- uint8_t *out_alert, Span<const uint8_t> peer_key);
-
- // Finish performs a key exchange against the |peer_key| generated by
- // |Accept|. On success, it returns true and sets |*out_secret| to the shared
- // secret. On failure, it returns zero and sets |*out_alert| to an alert to
- // send to the peer.
- virtual bool Finish(Array<uint8_t> *out_secret, uint8_t *out_alert,
- Span<const uint8_t> peer_key) PURE_VIRTUAL;
-
- // Serialize writes the state of the key exchange to |out|, returning true if
- // successful and false otherwise.
- virtual bool Serialize(CBB *out) { return false; }
-
- // Deserialize initializes the state of the key exchange from |in|, returning
- // true if successful and false otherwise. It is called by |Create|.
- virtual bool Deserialize(CBS *in) { return false; }
- };
-
- // ssl_nid_to_group_id looks up the group corresponding to |nid|. On success, it
- // sets |*out_group_id| to the group ID and returns one. Otherwise, it returns
- // zero.
- int ssl_nid_to_group_id(uint16_t *out_group_id, int nid);
-
- // ssl_name_to_group_id looks up the group corresponding to the |name| string
- // of length |len|. On success, it sets |*out_group_id| to the group ID and
- // returns one. Otherwise, it returns zero.
- int ssl_name_to_group_id(uint16_t *out_group_id, const char *name, size_t len);
-
-
- // Handshake messages.
-
- struct SSLMessage {
- bool is_v2_hello;
- uint8_t type;
- CBS body;
- // raw is the entire serialized handshake message, including the TLS or DTLS
- // message header.
- CBS raw;
- };
-
- // SSL_MAX_HANDSHAKE_FLIGHT is the number of messages, including
- // ChangeCipherSpec, in the longest handshake flight. Currently this is the
- // client's second leg in a full handshake when client certificates, NPN, and
- // Channel ID, are all enabled.
- #define SSL_MAX_HANDSHAKE_FLIGHT 7
-
- extern const uint8_t kHelloRetryRequest[SSL3_RANDOM_SIZE];
- extern const uint8_t kDraftDowngradeRandom[8];
-
- // ssl_max_handshake_message_len returns the maximum number of bytes permitted
- // in a handshake message for |ssl|.
- size_t ssl_max_handshake_message_len(const SSL *ssl);
-
- // tls_can_accept_handshake_data returns whether |ssl| is able to accept more
- // data into handshake buffer.
- bool tls_can_accept_handshake_data(const SSL *ssl, uint8_t *out_alert);
-
- // tls_has_unprocessed_handshake_data returns whether there is buffered
- // handshake data that has not been consumed by |get_message|.
- bool tls_has_unprocessed_handshake_data(const SSL *ssl);
-
- // dtls_has_unprocessed_handshake_data behaves like
- // |tls_has_unprocessed_handshake_data| for DTLS.
- bool dtls_has_unprocessed_handshake_data(const SSL *ssl);
-
- // tls_flush_pending_hs_data flushes any handshake plaintext data.
- bool tls_flush_pending_hs_data(SSL *ssl);
-
- struct DTLS_OUTGOING_MESSAGE {
- DTLS_OUTGOING_MESSAGE() {}
- DTLS_OUTGOING_MESSAGE(const DTLS_OUTGOING_MESSAGE &) = delete;
- DTLS_OUTGOING_MESSAGE &operator=(const DTLS_OUTGOING_MESSAGE &) = delete;
- ~DTLS_OUTGOING_MESSAGE() { Clear(); }
-
- void Clear();
-
- uint8_t *data = nullptr;
- uint32_t len = 0;
- uint16_t epoch = 0;
- bool is_ccs = false;
- };
-
- // dtls_clear_outgoing_messages releases all buffered outgoing messages.
- void dtls_clear_outgoing_messages(SSL *ssl);
-
-
- // Callbacks.
-
- // ssl_do_info_callback calls |ssl|'s info callback, if set.
- void ssl_do_info_callback(const SSL *ssl, int type, int value);
-
- // ssl_do_msg_callback calls |ssl|'s message callback, if set.
- void ssl_do_msg_callback(SSL *ssl, int is_write, int content_type,
- Span<const uint8_t> in);
-
-
- // Transport buffers.
-
- class SSLBuffer {
- public:
- SSLBuffer() {}
- ~SSLBuffer() { Clear(); }
-
- SSLBuffer(const SSLBuffer &) = delete;
- SSLBuffer &operator=(const SSLBuffer &) = delete;
-
- uint8_t *data() { return buf_ + offset_; }
- size_t size() const { return size_; }
- bool empty() const { return size_ == 0; }
- size_t cap() const { return cap_; }
-
- Span<uint8_t> span() { return MakeSpan(data(), size()); }
-
- Span<uint8_t> remaining() {
- return MakeSpan(data() + size(), cap() - size());
- }
-
- // Clear releases the buffer.
- void Clear();
-
- // EnsureCap ensures the buffer has capacity at least |new_cap|, aligned such
- // that data written after |header_len| is aligned to a
- // |SSL3_ALIGN_PAYLOAD|-byte boundary. It returns true on success and false
- // on error.
- bool EnsureCap(size_t header_len, size_t new_cap);
-
- // DidWrite extends the buffer by |len|. The caller must have filled in to
- // this point.
- void DidWrite(size_t len);
-
- // Consume consumes |len| bytes from the front of the buffer. The memory
- // consumed will remain valid until the next call to |DiscardConsumed| or
- // |Clear|.
- void Consume(size_t len);
-
- // DiscardConsumed discards the consumed bytes from the buffer. If the buffer
- // is now empty, it releases memory used by it.
- void DiscardConsumed();
-
- private:
- // buf_ is the memory allocated for this buffer.
- uint8_t *buf_ = nullptr;
- // offset_ is the offset into |buf_| which the buffer contents start at.
- uint16_t offset_ = 0;
- // size_ is the size of the buffer contents from |buf_| + |offset_|.
- uint16_t size_ = 0;
- // cap_ is how much memory beyond |buf_| + |offset_| is available.
- uint16_t cap_ = 0;
- };
-
- // ssl_read_buffer_extend_to extends the read buffer to the desired length. For
- // TLS, it reads to the end of the buffer until the buffer is |len| bytes
- // long. For DTLS, it reads a new packet and ignores |len|. It returns one on
- // success, zero on EOF, and a negative number on error.
- //
- // It is an error to call |ssl_read_buffer_extend_to| in DTLS when the buffer is
- // non-empty.
- int ssl_read_buffer_extend_to(SSL *ssl, size_t len);
-
- // ssl_handle_open_record handles the result of passing |ssl->s3->read_buffer|
- // to a record-processing function. If |ret| is a success or if the caller
- // should retry, it returns one and sets |*out_retry|. Otherwise, it returns <=
- // 0.
- int ssl_handle_open_record(SSL *ssl, bool *out_retry, ssl_open_record_t ret,
- size_t consumed, uint8_t alert);
-
- // ssl_write_buffer_flush flushes the write buffer to the transport. It returns
- // one on success and <= 0 on error. For DTLS, whether or not the write
- // succeeds, the write buffer will be cleared.
- int ssl_write_buffer_flush(SSL *ssl);
-
-
- // Certificate functions.
-
- // ssl_has_certificate returns one if a certificate and private key are
- // configured and zero otherwise.
- int ssl_has_certificate(const SSL_CONFIG *cfg);
-
- // ssl_parse_cert_chain parses a certificate list from |cbs| in the format used
- // by a TLS Certificate message. On success, it advances |cbs| and returns
- // true. Otherwise, it returns false and sets |*out_alert| to an alert to send
- // to the peer.
- //
- // If the list is non-empty then |*out_chain| and |*out_pubkey| will be set to
- // the certificate chain and the leaf certificate's public key
- // respectively. Otherwise, both will be set to nullptr.
- //
- // If the list is non-empty and |out_leaf_sha256| is non-NULL, it writes the
- // SHA-256 hash of the leaf to |out_leaf_sha256|.
- bool ssl_parse_cert_chain(uint8_t *out_alert,
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> *out_chain,
- UniquePtr<EVP_PKEY> *out_pubkey,
- uint8_t *out_leaf_sha256, CBS *cbs,
- CRYPTO_BUFFER_POOL *pool);
-
- // ssl_add_cert_chain adds |hs->ssl|'s certificate chain to |cbb| in the format
- // used by a TLS Certificate message. If there is no certificate chain, it emits
- // an empty certificate list. It returns one on success and zero on error.
- int ssl_add_cert_chain(SSL_HANDSHAKE *hs, CBB *cbb);
-
- // ssl_cert_check_digital_signature_key_usage parses the DER-encoded, X.509
- // certificate in |in| and returns one if doesn't specify a key usage or, if it
- // does, if it includes digitalSignature. Otherwise it pushes to the error
- // queue and returns zero.
- int ssl_cert_check_digital_signature_key_usage(const CBS *in);
-
- // ssl_cert_parse_pubkey extracts the public key from the DER-encoded, X.509
- // certificate in |in|. It returns an allocated |EVP_PKEY| or else returns
- // nullptr and pushes to the error queue.
- UniquePtr<EVP_PKEY> ssl_cert_parse_pubkey(const CBS *in);
-
- // ssl_parse_client_CA_list parses a CA list from |cbs| in the format used by a
- // TLS CertificateRequest message. On success, it returns a newly-allocated
- // |CRYPTO_BUFFER| list and advances |cbs|. Otherwise, it returns nullptr and
- // sets |*out_alert| to an alert to send to the peer.
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> ssl_parse_client_CA_list(SSL *ssl,
- uint8_t *out_alert,
- CBS *cbs);
-
- // ssl_has_client_CAs returns there are configured CAs.
- bool ssl_has_client_CAs(const SSL_CONFIG *cfg);
-
- // ssl_add_client_CA_list adds the configured CA list to |cbb| in the format
- // used by a TLS CertificateRequest message. It returns one on success and zero
- // on error.
- int ssl_add_client_CA_list(SSL_HANDSHAKE *hs, CBB *cbb);
-
- // ssl_check_leaf_certificate returns one if |pkey| and |leaf| are suitable as
- // a server's leaf certificate for |hs|. Otherwise, it returns zero and pushes
- // an error on the error queue.
- int ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey,
- const CRYPTO_BUFFER *leaf);
-
- // ssl_on_certificate_selected is called once the certificate has been selected.
- // It finalizes the certificate and initializes |hs->local_pubkey|. It returns
- // one on success and zero on error.
- int ssl_on_certificate_selected(SSL_HANDSHAKE *hs);
-
-
- // TLS 1.3 key derivation.
-
- // tls13_init_key_schedule initializes the handshake hash and key derivation
- // state, and incorporates the PSK. The cipher suite and PRF hash must have been
- // selected at this point. It returns one on success and zero on error.
- int tls13_init_key_schedule(SSL_HANDSHAKE *hs, const uint8_t *psk,
- size_t psk_len);
-
- // tls13_init_early_key_schedule initializes the handshake hash and key
- // derivation state from the resumption secret and incorporates the PSK to
- // derive the early secrets. It returns one on success and zero on error.
- int tls13_init_early_key_schedule(SSL_HANDSHAKE *hs, const uint8_t *psk,
- size_t psk_len);
-
- // tls13_advance_key_schedule incorporates |in| into the key schedule with
- // HKDF-Extract. It returns one on success and zero on error.
- int tls13_advance_key_schedule(SSL_HANDSHAKE *hs, const uint8_t *in,
- size_t len);
-
- // tls13_set_traffic_key sets the read or write traffic keys to
- // |traffic_secret|. It returns one on success and zero on error.
- int tls13_set_traffic_key(SSL *ssl, enum evp_aead_direction_t direction,
- const uint8_t *traffic_secret,
- size_t traffic_secret_len);
-
- // tls13_derive_early_secrets derives the early traffic secret. It returns one
- // on success and zero on error.
- int tls13_derive_early_secrets(SSL_HANDSHAKE *hs);
-
- // tls13_derive_handshake_secrets derives the handshake traffic secret. It
- // returns one on success and zero on error.
- int tls13_derive_handshake_secrets(SSL_HANDSHAKE *hs);
-
- // tls13_rotate_traffic_key derives the next read or write traffic secret. It
- // returns one on success and zero on error.
- int tls13_rotate_traffic_key(SSL *ssl, enum evp_aead_direction_t direction);
-
- // tls13_derive_application_secrets derives the initial application data traffic
- // and exporter secrets based on the handshake transcripts and |master_secret|.
- // It returns one on success and zero on error.
- int tls13_derive_application_secrets(SSL_HANDSHAKE *hs);
-
- // tls13_derive_resumption_secret derives the |resumption_secret|.
- int tls13_derive_resumption_secret(SSL_HANDSHAKE *hs);
-
- // tls13_export_keying_material provides an exporter interface to use the
- // |exporter_secret|.
- int tls13_export_keying_material(SSL *ssl, Span<uint8_t> out,
- Span<const uint8_t> secret,
- Span<const char> label,
- Span<const uint8_t> context);
-
- // tls13_finished_mac calculates the MAC of the handshake transcript to verify
- // the integrity of the Finished message, and stores the result in |out| and
- // length in |out_len|. |is_server| is 1 if this is for the Server Finished and
- // 0 for the Client Finished.
- int tls13_finished_mac(SSL_HANDSHAKE *hs, uint8_t *out,
- size_t *out_len, int is_server);
-
- // tls13_derive_session_psk calculates the PSK for this session based on the
- // resumption master secret and |nonce|. It returns true on success, and false
- // on failure.
- bool tls13_derive_session_psk(SSL_SESSION *session, Span<const uint8_t> nonce);
-
- // tls13_write_psk_binder calculates the PSK binder value and replaces the last
- // bytes of |msg| with the resulting value. It returns 1 on success, and 0 on
- // failure.
- int tls13_write_psk_binder(SSL_HANDSHAKE *hs, uint8_t *msg, size_t len);
-
- // tls13_verify_psk_binder verifies that the handshake transcript, truncated
- // up to the binders has a valid signature using the value of |session|'s
- // resumption secret. It returns 1 on success, and 0 on failure.
- int tls13_verify_psk_binder(SSL_HANDSHAKE *hs, SSL_SESSION *session,
- const SSLMessage &msg, CBS *binders);
-
-
- // Handshake functions.
-
- enum ssl_hs_wait_t {
- ssl_hs_error,
- ssl_hs_ok,
- ssl_hs_read_server_hello,
- ssl_hs_read_message,
- ssl_hs_flush,
- ssl_hs_certificate_selection_pending,
- ssl_hs_handoff,
- ssl_hs_handback,
- ssl_hs_x509_lookup,
- ssl_hs_channel_id_lookup,
- ssl_hs_private_key_operation,
- ssl_hs_pending_session,
- ssl_hs_pending_ticket,
- ssl_hs_early_return,
- ssl_hs_early_data_rejected,
- ssl_hs_read_end_of_early_data,
- ssl_hs_read_change_cipher_spec,
- ssl_hs_certificate_verify,
- };
-
- enum ssl_grease_index_t {
- ssl_grease_cipher = 0,
- ssl_grease_group,
- ssl_grease_extension1,
- ssl_grease_extension2,
- ssl_grease_version,
- ssl_grease_ticket_extension,
- ssl_grease_last_index = ssl_grease_ticket_extension,
- };
-
- enum tls12_server_hs_state_t {
- state12_start_accept = 0,
- state12_read_client_hello,
- state12_select_certificate,
- state12_tls13,
- state12_select_parameters,
- state12_send_server_hello,
- state12_send_server_certificate,
- state12_send_server_key_exchange,
- state12_send_server_hello_done,
- state12_read_client_certificate,
- state12_verify_client_certificate,
- state12_read_client_key_exchange,
- state12_read_client_certificate_verify,
- state12_read_change_cipher_spec,
- state12_process_change_cipher_spec,
- state12_read_next_proto,
- state12_read_channel_id,
- state12_read_client_finished,
- state12_send_server_finished,
- state12_finish_server_handshake,
- state12_done,
- };
-
- // handback_t lists the points in the state machine where a handback can occur.
- // These are the different points at which key material is no longer needed.
- enum handback_t {
- handback_after_session_resumption,
- handback_after_ecdhe,
- handback_after_handshake,
- };
-
- struct SSL_HANDSHAKE {
- explicit SSL_HANDSHAKE(SSL *ssl);
- ~SSL_HANDSHAKE();
- static constexpr bool kAllowUniquePtr = true;
-
- // ssl is a non-owning pointer to the parent |SSL| object.
- SSL *ssl;
-
- // config is a non-owning pointer to the handshake configuration.
- SSL_CONFIG *config;
-
- // wait contains the operation the handshake is currently blocking on or
- // |ssl_hs_ok| if none.
- enum ssl_hs_wait_t wait = ssl_hs_ok;
-
- // state is the internal state for the TLS 1.2 and below handshake. Its
- // values depend on |do_handshake| but the starting state is always zero.
- int state = 0;
-
- // tls13_state is the internal state for the TLS 1.3 handshake. Its values
- // depend on |do_handshake| but the starting state is always zero.
- int tls13_state = 0;
-
- // min_version is the minimum accepted protocol version, taking account both
- // |SSL_OP_NO_*| and |SSL_CTX_set_min_proto_version| APIs.
- uint16_t min_version = 0;
-
- // max_version is the maximum accepted protocol version, taking account both
- // |SSL_OP_NO_*| and |SSL_CTX_set_max_proto_version| APIs.
- uint16_t max_version = 0;
-
- size_t hash_len = 0;
- uint8_t secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t early_traffic_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t client_handshake_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t server_handshake_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t client_traffic_secret_0[EVP_MAX_MD_SIZE] = {0};
- uint8_t server_traffic_secret_0[EVP_MAX_MD_SIZE] = {0};
- uint8_t expected_client_finished[EVP_MAX_MD_SIZE] = {0};
-
- union {
- // sent is a bitset where the bits correspond to elements of kExtensions
- // in t1_lib.c. Each bit is set if that extension was sent in a
- // ClientHello. It's not used by servers.
- uint32_t sent = 0;
- // received is a bitset, like |sent|, but is used by servers to record
- // which extensions were received from a client.
- uint32_t received;
- } extensions;
-
- // retry_group is the group ID selected by the server in HelloRetryRequest in
- // TLS 1.3.
- uint16_t retry_group = 0;
-
- // error, if |wait| is |ssl_hs_error|, is the error the handshake failed on.
- UniquePtr<ERR_SAVE_STATE> error;
-
- // key_share is the current key exchange instance.
- UniquePtr<SSLKeyShare> key_share;
-
- // transcript is the current handshake transcript.
- SSLTranscript transcript;
-
- // cookie is the value of the cookie received from the server, if any.
- Array<uint8_t> cookie;
-
- // key_share_bytes is the value of the previously sent KeyShare extension by
- // the client in TLS 1.3.
- Array<uint8_t> key_share_bytes;
-
- // ecdh_public_key, for servers, is the key share to be sent to the client in
- // TLS 1.3.
- Array<uint8_t> ecdh_public_key;
-
- // peer_sigalgs are the signature algorithms that the peer supports. These are
- // taken from the contents of the signature algorithms extension for a server
- // or from the CertificateRequest for a client.
- Array<uint16_t> peer_sigalgs;
-
- // peer_supported_group_list contains the supported group IDs advertised by
- // the peer. This is only set on the server's end. The server does not
- // advertise this extension to the client.
- Array<uint16_t> peer_supported_group_list;
-
- // peer_key is the peer's ECDH key for a TLS 1.2 client.
- Array<uint8_t> peer_key;
-
- // negotiated_token_binding_version is used by a server to store the
- // on-the-wire encoding of the Token Binding protocol version to advertise in
- // the ServerHello/EncryptedExtensions if the Token Binding extension is to be
- // sent.
- uint16_t negotiated_token_binding_version;
-
- // cert_compression_alg_id, for a server, contains the negotiated certificate
- // compression algorithm for this client. It is only valid if
- // |cert_compression_negotiated| is true.
- uint16_t cert_compression_alg_id;
-
- // server_params, in a TLS 1.2 server, stores the ServerKeyExchange
- // parameters. It has client and server randoms prepended for signing
- // convenience.
- Array<uint8_t> server_params;
-
- // peer_psk_identity_hint, on the client, is the psk_identity_hint sent by the
- // server when using a TLS 1.2 PSK key exchange.
- UniquePtr<char> peer_psk_identity_hint;
-
- // ca_names, on the client, contains the list of CAs received in a
- // CertificateRequest message.
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> ca_names;
-
- // cached_x509_ca_names contains a cache of parsed versions of the elements of
- // |ca_names|. This pointer is left non-owning so only
- // |ssl_crypto_x509_method| needs to link against crypto/x509.
- STACK_OF(X509_NAME) *cached_x509_ca_names = nullptr;
-
- // certificate_types, on the client, contains the set of certificate types
- // received in a CertificateRequest message.
- Array<uint8_t> certificate_types;
-
- // local_pubkey is the public key we are authenticating as.
- UniquePtr<EVP_PKEY> local_pubkey;
-
- // peer_pubkey is the public key parsed from the peer's leaf certificate.
- UniquePtr<EVP_PKEY> peer_pubkey;
-
- // new_session is the new mutable session being established by the current
- // handshake. It should not be cached.
- UniquePtr<SSL_SESSION> new_session;
-
- // early_session is the session corresponding to the current 0-RTT state on
- // the client if |in_early_data| is true.
- UniquePtr<SSL_SESSION> early_session;
-
- // new_cipher is the cipher being negotiated in this handshake.
- const SSL_CIPHER *new_cipher = nullptr;
-
- // key_block is the record-layer key block for TLS 1.2 and earlier.
- Array<uint8_t> key_block;
-
- // scts_requested is true if the SCT extension is in the ClientHello.
- bool scts_requested:1;
-
- // needs_psk_binder is true if the ClientHello has a placeholder PSK binder to
- // be filled in.
- bool needs_psk_binder:1;
-
- bool received_hello_retry_request:1;
- bool sent_hello_retry_request:1;
-
- // handshake_finalized is true once the handshake has completed, at which
- // point accessors should use the established state.
- bool handshake_finalized:1;
-
- // accept_psk_mode stores whether the client's PSK mode is compatible with our
- // preferences.
- bool accept_psk_mode:1;
-
- // cert_request is true if a client certificate was requested.
- bool cert_request:1;
-
- // certificate_status_expected is true if OCSP stapling was negotiated and the
- // server is expected to send a CertificateStatus message. (This is used on
- // both the client and server sides.)
- bool certificate_status_expected:1;
-
- // ocsp_stapling_requested is true if a client requested OCSP stapling.
- bool ocsp_stapling_requested:1;
-
- // should_ack_sni is used by a server and indicates that the SNI extension
- // should be echoed in the ServerHello.
- bool should_ack_sni:1;
-
- // in_false_start is true if there is a pending client handshake in False
- // Start. The client may write data at this point.
- bool in_false_start:1;
-
- // in_early_data is true if there is a pending handshake that has progressed
- // enough to send and receive early data.
- bool in_early_data:1;
-
- // early_data_offered is true if the client sent the early_data extension.
- bool early_data_offered:1;
-
- // can_early_read is true if application data may be read at this point in the
- // handshake.
- bool can_early_read:1;
-
- // can_early_write is true if application data may be written at this point in
- // the handshake.
- bool can_early_write:1;
-
- // next_proto_neg_seen is one of NPN was negotiated.
- bool next_proto_neg_seen:1;
-
- // ticket_expected is true if a TLS 1.2 NewSessionTicket message is to be sent
- // or received.
- bool ticket_expected:1;
-
- // extended_master_secret is true if the extended master secret extension is
- // negotiated in this handshake.
- bool extended_master_secret:1;
-
- // pending_private_key_op is true if there is a pending private key operation
- // in progress.
- bool pending_private_key_op:1;
-
- // grease_seeded is true if |grease_seed| has been initialized.
- bool grease_seeded:1;
-
- // handback indicates that a server should pause the handshake after
- // finishing operations that require private key material, in such a way that
- // |SSL_get_error| returns |SSL_HANDBACK|. It is set by |SSL_apply_handoff|.
- bool handback:1;
-
- // cert_compression_negotiated is true iff |cert_compression_alg_id| is valid.
- bool cert_compression_negotiated:1;
-
- // client_version is the value sent or received in the ClientHello version.
- uint16_t client_version = 0;
-
- // early_data_read is the amount of early data that has been read by the
- // record layer.
- uint16_t early_data_read = 0;
-
- // early_data_written is the amount of early data that has been written by the
- // record layer.
- uint16_t early_data_written = 0;
-
- // session_id is the session ID in the ClientHello, used for the experimental
- // TLS 1.3 variant.
- uint8_t session_id[SSL_MAX_SSL_SESSION_ID_LENGTH] = {0};
- uint8_t session_id_len = 0;
-
- // grease_seed is the entropy for GREASE values. It is valid if
- // |grease_seeded| is true.
- uint8_t grease_seed[ssl_grease_last_index + 1] = {0};
-
- // dummy_pq_padding_len, in a server, is the length of the extension that
- // should be echoed in a ServerHello, or zero if no extension should be
- // echoed.
- uint16_t dummy_pq_padding_len = 0;
- };
-
- UniquePtr<SSL_HANDSHAKE> ssl_handshake_new(SSL *ssl);
-
- // ssl_check_message_type checks if |msg| has type |type|. If so it returns
- // one. Otherwise, it sends an alert and returns zero.
- bool ssl_check_message_type(SSL *ssl, const SSLMessage &msg, int type);
-
- // ssl_run_handshake runs the TLS handshake. It returns one on success and <= 0
- // on error. It sets |out_early_return| to one if we've completed the handshake
- // early.
- int ssl_run_handshake(SSL_HANDSHAKE *hs, bool *out_early_return);
-
- // The following are implementations of |do_handshake| for the client and
- // server.
- enum ssl_hs_wait_t ssl_client_handshake(SSL_HANDSHAKE *hs);
- enum ssl_hs_wait_t ssl_server_handshake(SSL_HANDSHAKE *hs);
- enum ssl_hs_wait_t tls13_client_handshake(SSL_HANDSHAKE *hs);
- enum ssl_hs_wait_t tls13_server_handshake(SSL_HANDSHAKE *hs);
-
- // The following functions return human-readable representations of the TLS
- // handshake states for debugging.
- const char *ssl_client_handshake_state(SSL_HANDSHAKE *hs);
- const char *ssl_server_handshake_state(SSL_HANDSHAKE *hs);
- const char *tls13_client_handshake_state(SSL_HANDSHAKE *hs);
- const char *tls13_server_handshake_state(SSL_HANDSHAKE *hs);
-
- // tls13_post_handshake processes a post-handshake message. It returns one on
- // success and zero on failure.
- int tls13_post_handshake(SSL *ssl, const SSLMessage &msg);
-
- int tls13_process_certificate(SSL_HANDSHAKE *hs, const SSLMessage &msg,
- int allow_anonymous);
- int tls13_process_certificate_verify(SSL_HANDSHAKE *hs, const SSLMessage &msg);
-
- // tls13_process_finished processes |msg| as a Finished message from the
- // peer. If |use_saved_value| is one, the verify_data is compared against
- // |hs->expected_client_finished| rather than computed fresh.
- int tls13_process_finished(SSL_HANDSHAKE *hs, const SSLMessage &msg,
- int use_saved_value);
-
- int tls13_add_certificate(SSL_HANDSHAKE *hs);
-
- // tls13_add_certificate_verify adds a TLS 1.3 CertificateVerify message to the
- // handshake. If it returns |ssl_private_key_retry|, it should be called again
- // to retry when the signing operation is completed.
- enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs);
-
- int tls13_add_finished(SSL_HANDSHAKE *hs);
- int tls13_process_new_session_ticket(SSL *ssl, const SSLMessage &msg);
-
- bool ssl_ext_key_share_parse_serverhello(SSL_HANDSHAKE *hs,
- Array<uint8_t> *out_secret,
- uint8_t *out_alert, CBS *contents);
- bool ssl_ext_key_share_parse_clienthello(SSL_HANDSHAKE *hs, bool *out_found,
- Array<uint8_t> *out_secret,
- uint8_t *out_alert, CBS *contents);
- bool ssl_ext_key_share_add_serverhello(SSL_HANDSHAKE *hs, CBB *out);
-
- bool ssl_ext_pre_shared_key_parse_serverhello(SSL_HANDSHAKE *hs,
- uint8_t *out_alert,
- CBS *contents);
- bool ssl_ext_pre_shared_key_parse_clienthello(
- SSL_HANDSHAKE *hs, CBS *out_ticket, CBS *out_binders,
- uint32_t *out_obfuscated_ticket_age, uint8_t *out_alert, CBS *contents);
- bool ssl_ext_pre_shared_key_add_serverhello(SSL_HANDSHAKE *hs, CBB *out);
-
- // ssl_is_sct_list_valid does a shallow parse of the SCT list in |contents| and
- // returns whether it's valid.
- bool ssl_is_sct_list_valid(const CBS *contents);
-
- int ssl_write_client_hello(SSL_HANDSHAKE *hs);
-
- enum ssl_cert_verify_context_t {
- ssl_cert_verify_server,
- ssl_cert_verify_client,
- ssl_cert_verify_channel_id,
- };
-
- // tls13_get_cert_verify_signature_input generates the message to be signed for
- // TLS 1.3's CertificateVerify message. |cert_verify_context| determines the
- // type of signature. It sets |*out| to a newly allocated buffer containing the
- // result. This function returns true on success and false on failure.
- bool tls13_get_cert_verify_signature_input(
- SSL_HANDSHAKE *hs, Array<uint8_t> *out,
- enum ssl_cert_verify_context_t cert_verify_context);
-
- // ssl_is_alpn_protocol_allowed returns whether |protocol| is a valid server
- // selection for |hs->ssl|'s client preferences.
- bool ssl_is_alpn_protocol_allowed(const SSL_HANDSHAKE *hs,
- Span<const uint8_t> protocol);
-
- // ssl_negotiate_alpn negotiates the ALPN extension, if applicable. It returns
- // true on successful negotiation or if nothing was negotiated. It returns false
- // and sets |*out_alert| to an alert on error.
- bool ssl_negotiate_alpn(SSL_HANDSHAKE *hs, uint8_t *out_alert,
- const SSL_CLIENT_HELLO *client_hello);
-
- struct SSL_EXTENSION_TYPE {
- uint16_t type;
- bool *out_present;
- CBS *out_data;
- };
-
- // ssl_parse_extensions parses a TLS extensions block out of |cbs| and advances
- // it. It writes the parsed extensions to pointers denoted by |ext_types|. On
- // success, it fills in the |out_present| and |out_data| fields and returns one.
- // Otherwise, it sets |*out_alert| to an alert to send and returns zero. Unknown
- // extensions are rejected unless |ignore_unknown| is 1.
- int ssl_parse_extensions(const CBS *cbs, uint8_t *out_alert,
- const SSL_EXTENSION_TYPE *ext_types,
- size_t num_ext_types, int ignore_unknown);
-
- // ssl_verify_peer_cert verifies the peer certificate for |hs|.
- enum ssl_verify_result_t ssl_verify_peer_cert(SSL_HANDSHAKE *hs);
-
- enum ssl_hs_wait_t ssl_get_finished(SSL_HANDSHAKE *hs);
- bool ssl_send_finished(SSL_HANDSHAKE *hs);
- bool ssl_output_cert_chain(SSL_HANDSHAKE *hs);
-
- // SSLKEYLOGFILE functions.
-
- // ssl_log_secret logs |secret| with label |label|, if logging is enabled for
- // |ssl|. It returns one on success and zero on failure.
- int ssl_log_secret(const SSL *ssl, const char *label, const uint8_t *secret,
- size_t secret_len);
-
-
- // ClientHello functions.
-
- bool ssl_client_hello_init(SSL *ssl, SSL_CLIENT_HELLO *out,
- const SSLMessage &msg);
-
- bool ssl_client_hello_get_extension(const SSL_CLIENT_HELLO *client_hello,
- CBS *out, uint16_t extension_type);
-
- bool ssl_client_cipher_list_contains_cipher(
- const SSL_CLIENT_HELLO *client_hello, uint16_t id);
-
-
- // GREASE.
-
- // ssl_get_grease_value returns a GREASE value for |hs|. For a given
- // connection, the values for each index will be deterministic. This allows the
- // same ClientHello be sent twice for a HelloRetryRequest or the same group be
- // advertised in both supported_groups and key_shares.
- uint16_t ssl_get_grease_value(SSL_HANDSHAKE *hs, enum ssl_grease_index_t index);
-
-
- // Signature algorithms.
-
- // tls1_parse_peer_sigalgs parses |sigalgs| as the list of peer signature
- // algorithms and saves them on |hs|. It returns true on success and false on
- // error.
- bool tls1_parse_peer_sigalgs(SSL_HANDSHAKE *hs, const CBS *sigalgs);
-
- // tls1_get_legacy_signature_algorithm sets |*out| to the signature algorithm
- // that should be used with |pkey| in TLS 1.1 and earlier. It returns true on
- // success and false if |pkey| may not be used at those versions.
- bool tls1_get_legacy_signature_algorithm(uint16_t *out, const EVP_PKEY *pkey);
-
- // tls1_choose_signature_algorithm sets |*out| to a signature algorithm for use
- // with |hs|'s private key based on the peer's preferences and the algorithms
- // supported. It returns true on success and false on error.
- bool tls1_choose_signature_algorithm(SSL_HANDSHAKE *hs, uint16_t *out);
-
- // tls12_add_verify_sigalgs adds the signature algorithms acceptable for the
- // peer signature to |out|. It returns true on success and false on error. If
- // |for_certs| is true, the potentially more restrictive list of algorithms for
- // certificates is used. Otherwise, the online signature one is used.
- bool tls12_add_verify_sigalgs(const SSL *ssl, CBB *out, bool for_certs);
-
- // tls12_check_peer_sigalg checks if |sigalg| is acceptable for the peer
- // signature. It returns true on success and false on error, setting
- // |*out_alert| to an alert to send.
- bool tls12_check_peer_sigalg(const SSL *ssl, uint8_t *out_alert,
- uint16_t sigalg);
-
- // tls12_has_different_verify_sigalgs_for_certs returns whether |ssl| has a
- // different, more restrictive, list of signature algorithms acceptable for the
- // certificate than the online signature.
- bool tls12_has_different_verify_sigalgs_for_certs(const SSL *ssl);
-
-
- // Underdocumented functions.
- //
- // Functions below here haven't been touched up and may be underdocumented.
-
- #define TLSEXT_CHANNEL_ID_SIZE 128
-
- // From RFC4492, used in encoding the curve type in ECParameters
- #define NAMED_CURVE_TYPE 3
-
- struct CERT {
- static constexpr bool kAllowUniquePtr = true;
-
- explicit CERT(const SSL_X509_METHOD *x509_method);
- ~CERT();
-
- UniquePtr<EVP_PKEY> privatekey;
-
- // chain contains the certificate chain, with the leaf at the beginning. The
- // first element of |chain| may be NULL to indicate that the leaf certificate
- // has not yet been set.
- // If |chain| != NULL -> len(chain) >= 1
- // If |chain[0]| == NULL -> len(chain) >= 2.
- // |chain[1..]| != NULL
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain;
-
- // x509_chain may contain a parsed copy of |chain[1..]|. This is only used as
- // a cache in order to implement “get0” functions that return a non-owning
- // pointer to the certificate chain.
- STACK_OF(X509) *x509_chain = nullptr;
-
- // x509_leaf may contain a parsed copy of the first element of |chain|. This
- // is only used as a cache in order to implement “get0” functions that return
- // a non-owning pointer to the certificate chain.
- X509 *x509_leaf = nullptr;
-
- // x509_stash contains the last |X509| object append to the chain. This is a
- // workaround for some third-party code that continue to use an |X509| object
- // even after passing ownership with an “add0” function.
- X509 *x509_stash = nullptr;
-
- // key_method, if non-NULL, is a set of callbacks to call for private key
- // operations.
- const SSL_PRIVATE_KEY_METHOD *key_method = nullptr;
-
- // x509_method contains pointers to functions that might deal with |X509|
- // compatibility, or might be a no-op, depending on the application.
- const SSL_X509_METHOD *x509_method = nullptr;
-
- // sigalgs, if non-empty, is the set of signature algorithms supported by
- // |privatekey| in decreasing order of preference.
- Array<uint16_t> sigalgs;
-
- // Certificate setup callback: if set is called whenever a
- // certificate may be required (client or server). the callback
- // can then examine any appropriate parameters and setup any
- // certificates required. This allows advanced applications
- // to select certificates on the fly: for example based on
- // supported signature algorithms or curves.
- int (*cert_cb)(SSL *ssl, void *arg) = nullptr;
- void *cert_cb_arg = nullptr;
-
- // Optional X509_STORE for certificate validation. If NULL the parent SSL_CTX
- // store is used instead.
- X509_STORE *verify_store = nullptr;
-
- // Signed certificate timestamp list to be sent to the client, if requested
- UniquePtr<CRYPTO_BUFFER> signed_cert_timestamp_list;
-
- // OCSP response to be sent to the client, if requested.
- UniquePtr<CRYPTO_BUFFER> ocsp_response;
-
- // sid_ctx partitions the session space within a shared session cache or
- // ticket key. Only sessions with a matching value will be accepted.
- uint8_t sid_ctx_length = 0;
- uint8_t sid_ctx[SSL_MAX_SID_CTX_LENGTH] = {0};
- };
-
- // |SSL_PROTOCOL_METHOD| abstracts between TLS and DTLS.
- struct SSL_PROTOCOL_METHOD {
- bool is_dtls;
- bool (*ssl_new)(SSL *ssl);
- void (*ssl_free)(SSL *ssl);
- // get_message sets |*out| to the current handshake message and returns true
- // if one has been received. It returns false if more input is needed.
- bool (*get_message)(SSL *ssl, SSLMessage *out);
- // next_message is called to release the current handshake message.
- void (*next_message)(SSL *ssl);
- // Use the |ssl_open_handshake| wrapper.
- ssl_open_record_t (*open_handshake)(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
- // Use the |ssl_open_change_cipher_spec| wrapper.
- ssl_open_record_t (*open_change_cipher_spec)(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert,
- Span<uint8_t> in);
- // Use the |ssl_open_app_data| wrapper.
- ssl_open_record_t (*open_app_data)(SSL *ssl, Span<uint8_t> *out,
- size_t *out_consumed, uint8_t *out_alert,
- Span<uint8_t> in);
- int (*write_app_data)(SSL *ssl, bool *out_needs_handshake, const uint8_t *buf,
- int len);
- int (*dispatch_alert)(SSL *ssl);
- // init_message begins a new handshake message of type |type|. |cbb| is the
- // root CBB to be passed into |finish_message|. |*body| is set to a child CBB
- // the caller should write to. It returns true on success and false on error.
- bool (*init_message)(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
- // finish_message finishes a handshake message. It sets |*out_msg| to the
- // serialized message. It returns true on success and false on error.
- bool (*finish_message)(SSL *ssl, CBB *cbb, bssl::Array<uint8_t> *out_msg);
- // add_message adds a handshake message to the pending flight. It returns
- // true on success and false on error.
- bool (*add_message)(SSL *ssl, bssl::Array<uint8_t> msg);
- // add_change_cipher_spec adds a ChangeCipherSpec record to the pending
- // flight. It returns true on success and false on error.
- bool (*add_change_cipher_spec)(SSL *ssl);
- // add_alert adds an alert to the pending flight. It returns true on success
- // and false on error.
- bool (*add_alert)(SSL *ssl, uint8_t level, uint8_t desc);
- // flush_flight flushes the pending flight to the transport. It returns one on
- // success and <= 0 on error.
- int (*flush_flight)(SSL *ssl);
- // on_handshake_complete is called when the handshake is complete.
- void (*on_handshake_complete)(SSL *ssl);
- // set_read_state sets |ssl|'s read cipher state to |aead_ctx|. It returns
- // true on success and false if changing the read state is forbidden at this
- // point.
- bool (*set_read_state)(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx);
- // set_write_state sets |ssl|'s write cipher state to |aead_ctx|. It returns
- // true on success and false if changing the write state is forbidden at this
- // point.
- bool (*set_write_state)(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx);
- };
-
- // The following wrappers call |open_*| but handle |read_shutdown| correctly.
-
- // ssl_open_handshake processes a record from |in| for reading a handshake
- // message.
- ssl_open_record_t ssl_open_handshake(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
-
- // ssl_open_change_cipher_spec processes a record from |in| for reading a
- // ChangeCipherSpec.
- ssl_open_record_t ssl_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert,
- Span<uint8_t> in);
-
- // ssl_open_app_data processes a record from |in| for reading application data.
- // On success, it returns |ssl_open_record_success| and sets |*out| to the
- // input. If it encounters a post-handshake message, it returns
- // |ssl_open_record_discard|. The caller should then retry, after processing any
- // messages received with |get_message|.
- ssl_open_record_t ssl_open_app_data(SSL *ssl, Span<uint8_t> *out,
- size_t *out_consumed, uint8_t *out_alert,
- Span<uint8_t> in);
-
- struct SSL_X509_METHOD {
- // check_client_CA_list returns one if |names| is a good list of X.509
- // distinguished names and zero otherwise. This is used to ensure that we can
- // reject unparsable values at handshake time when using crypto/x509.
- int (*check_client_CA_list)(STACK_OF(CRYPTO_BUFFER) *names);
-
- // cert_clear frees and NULLs all X509 certificate-related state.
- void (*cert_clear)(CERT *cert);
- // cert_free frees all X509-related state.
- void (*cert_free)(CERT *cert);
- // cert_flush_cached_chain drops any cached |X509|-based certificate chain
- // from |cert|.
- // cert_dup duplicates any needed fields from |cert| to |new_cert|.
- void (*cert_dup)(CERT *new_cert, const CERT *cert);
- void (*cert_flush_cached_chain)(CERT *cert);
- // cert_flush_cached_chain drops any cached |X509|-based leaf certificate
- // from |cert|.
- void (*cert_flush_cached_leaf)(CERT *cert);
-
- // session_cache_objects fills out |sess->x509_peer| and |sess->x509_chain|
- // from |sess->certs| and erases |sess->x509_chain_without_leaf|. It returns
- // one on success or zero on error.
- int (*session_cache_objects)(SSL_SESSION *session);
- // session_dup duplicates any needed fields from |session| to |new_session|.
- // It returns one on success or zero on error.
- int (*session_dup)(SSL_SESSION *new_session, const SSL_SESSION *session);
- // session_clear frees any X509-related state from |session|.
- void (*session_clear)(SSL_SESSION *session);
- // session_verify_cert_chain verifies the certificate chain in |session|,
- // sets |session->verify_result| and returns one on success or zero on
- // error.
- int (*session_verify_cert_chain)(SSL_SESSION *session, SSL_HANDSHAKE *ssl,
- uint8_t *out_alert);
-
- // hs_flush_cached_ca_names drops any cached |X509_NAME|s from |hs|.
- void (*hs_flush_cached_ca_names)(SSL_HANDSHAKE *hs);
- // ssl_new does any neccessary initialisation of |hs|. It returns one on
- // success or zero on error.
- int (*ssl_new)(SSL_HANDSHAKE *hs);
- // ssl_free frees anything created by |ssl_new|.
- void (*ssl_config_free)(SSL_CONFIG *cfg);
- // ssl_flush_cached_client_CA drops any cached |X509_NAME|s from |ssl|.
- void (*ssl_flush_cached_client_CA)(SSL_CONFIG *cfg);
- // ssl_auto_chain_if_needed runs the deprecated auto-chaining logic if
- // necessary. On success, it updates |ssl|'s certificate configuration as
- // needed and returns one. Otherwise, it returns zero.
- int (*ssl_auto_chain_if_needed)(SSL_HANDSHAKE *hs);
- // ssl_ctx_new does any neccessary initialisation of |ctx|. It returns one on
- // success or zero on error.
- int (*ssl_ctx_new)(SSL_CTX *ctx);
- // ssl_ctx_free frees anything created by |ssl_ctx_new|.
- void (*ssl_ctx_free)(SSL_CTX *ctx);
- // ssl_ctx_flush_cached_client_CA drops any cached |X509_NAME|s from |ctx|.
- void (*ssl_ctx_flush_cached_client_CA)(SSL_CTX *ssl);
- };
-
- // ssl_crypto_x509_method provides the |SSL_X509_METHOD| functions using
- // crypto/x509.
- extern const SSL_X509_METHOD ssl_crypto_x509_method;
-
- // ssl_noop_x509_method provides the |SSL_X509_METHOD| functions that avoid
- // crypto/x509.
- extern const SSL_X509_METHOD ssl_noop_x509_method;
-
- struct TicketKey {
- static constexpr bool kAllowUniquePtr = true;
-
- uint8_t name[SSL_TICKET_KEY_NAME_LEN] = {0};
- uint8_t hmac_key[16] = {0};
- uint8_t aes_key[16] = {0};
- // next_rotation_tv_sec is the time (in seconds from the epoch) when the
- // current key should be superseded by a new key, or the time when a previous
- // key should be dropped. If zero, then the key should not be automatically
- // rotated.
- uint64_t next_rotation_tv_sec = 0;
- };
-
- struct CertCompressionAlg {
- static constexpr bool kAllowUniquePtr = true;
-
- ssl_cert_compression_func_t compress = nullptr;
- ssl_cert_decompression_func_t decompress = nullptr;
- uint16_t alg_id = 0;
- };
-
- } // namespace bssl
-
- DECLARE_LHASH_OF(SSL_SESSION)
-
- DEFINE_NAMED_STACK_OF(CertCompressionAlg, bssl::CertCompressionAlg);
-
- namespace bssl {
-
- // An ssl_shutdown_t describes the shutdown state of one end of the connection,
- // whether it is alive or has been shutdown via close_notify or fatal alert.
- enum ssl_shutdown_t {
- ssl_shutdown_none = 0,
- ssl_shutdown_close_notify = 1,
- ssl_shutdown_error = 2,
- };
-
- struct SSL3_STATE {
- static constexpr bool kAllowUniquePtr = true;
-
- SSL3_STATE();
- ~SSL3_STATE();
-
- uint8_t read_sequence[8] = {0};
- uint8_t write_sequence[8] = {0};
-
- uint8_t server_random[SSL3_RANDOM_SIZE] = {0};
- uint8_t client_random[SSL3_RANDOM_SIZE] = {0};
-
- // read_buffer holds data from the transport to be processed.
- SSLBuffer read_buffer;
- // write_buffer holds data to be written to the transport.
- SSLBuffer write_buffer;
-
- // pending_app_data is the unconsumed application data. It points into
- // |read_buffer|.
- Span<uint8_t> pending_app_data;
-
- // partial write - check the numbers match
- unsigned int wnum = 0; // number of bytes sent so far
- int wpend_tot = 0; // number bytes written
- int wpend_type = 0;
- int wpend_ret = 0; // number of bytes submitted
- const uint8_t *wpend_buf = nullptr;
-
- // read_shutdown is the shutdown state for the read half of the connection.
- enum ssl_shutdown_t read_shutdown = ssl_shutdown_none;
-
- // write_shutdown is the shutdown state for the write half of the connection.
- enum ssl_shutdown_t write_shutdown = ssl_shutdown_none;
-
- // read_error, if |read_shutdown| is |ssl_shutdown_error|, is the error for
- // the receive half of the connection.
- UniquePtr<ERR_SAVE_STATE> read_error;
-
- int alert_dispatch = 0;
-
- int total_renegotiations = 0;
-
- // This holds a variable that indicates what we were doing when a 0 or -1 is
- // returned. This is needed for non-blocking IO so we know what request
- // needs re-doing when in SSL_accept or SSL_connect
- int rwstate = SSL_NOTHING;
-
- // early_data_skipped is the amount of early data that has been skipped by the
- // record layer.
- uint16_t early_data_skipped = 0;
-
- // empty_record_count is the number of consecutive empty records received.
- uint8_t empty_record_count = 0;
-
- // warning_alert_count is the number of consecutive warning alerts
- // received.
- uint8_t warning_alert_count = 0;
-
- // key_update_count is the number of consecutive KeyUpdates received.
- uint8_t key_update_count = 0;
-
- // The negotiated Token Binding key parameter. Only valid if
- // |token_binding_negotiated| is set.
- uint8_t negotiated_token_binding_param = 0;
-
- // skip_early_data instructs the record layer to skip unexpected early data
- // messages when 0RTT is rejected.
- bool skip_early_data:1;
-
- // have_version is true if the connection's final version is known. Otherwise
- // the version has not been negotiated yet.
- bool have_version:1;
-
- // v2_hello_done is true if the peer's V2ClientHello, if any, has been handled
- // and future messages should use the record layer.
- bool v2_hello_done:1;
-
- // is_v2_hello is true if the current handshake message was derived from a
- // V2ClientHello rather than received from the peer directly.
- bool is_v2_hello:1;
-
- // has_message is true if the current handshake message has been returned
- // at least once by |get_message| and false otherwise.
- bool has_message:1;
-
- // initial_handshake_complete is true if the initial handshake has
- // completed.
- bool initial_handshake_complete:1;
-
- // session_reused indicates whether a session was resumed.
- bool session_reused:1;
-
- bool send_connection_binding:1;
-
- // In a client, this means that the server supported Channel ID and that a
- // Channel ID was sent. In a server it means that we echoed support for
- // Channel IDs and that |channel_id| will be valid after the handshake.
- bool channel_id_valid:1;
-
- // key_update_pending is true if we have a KeyUpdate acknowledgment
- // outstanding.
- bool key_update_pending:1;
-
- // wpend_pending is true if we have a pending write outstanding.
- bool wpend_pending:1;
-
- // early_data_accepted is true if early data was accepted by the server.
- bool early_data_accepted:1;
-
- // draft_downgrade is whether the TLS 1.3 anti-downgrade logic would have
- // fired, were it not a draft.
- bool draft_downgrade:1;
-
- // token_binding_negotiated is set if Token Binding was negotiated.
- bool token_binding_negotiated:1;
-
- // hs_buf is the buffer of handshake data to process.
- UniquePtr<BUF_MEM> hs_buf;
-
- // pending_hs_data contains the pending handshake data that has not yet
- // been encrypted to |pending_flight|. This allows packing the handshake into
- // fewer records.
- UniquePtr<BUF_MEM> pending_hs_data;
-
- // pending_flight is the pending outgoing flight. This is used to flush each
- // handshake flight in a single write. |write_buffer| must be written out
- // before this data.
- UniquePtr<BUF_MEM> pending_flight;
-
- // pending_flight_offset is the number of bytes of |pending_flight| which have
- // been successfully written.
- uint32_t pending_flight_offset = 0;
-
- // ticket_age_skew is the difference, in seconds, between the client-sent
- // ticket age and the server-computed value in TLS 1.3 server connections
- // which resumed a session.
- int32_t ticket_age_skew = 0;
-
- // aead_read_ctx is the current read cipher state.
- UniquePtr<SSLAEADContext> aead_read_ctx;
-
- // aead_write_ctx is the current write cipher state.
- UniquePtr<SSLAEADContext> aead_write_ctx;
-
- // hs is the handshake state for the current handshake or NULL if there isn't
- // one.
- UniquePtr<SSL_HANDSHAKE> hs;
-
- uint8_t write_traffic_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t read_traffic_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t exporter_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t early_exporter_secret[EVP_MAX_MD_SIZE] = {0};
- uint8_t write_traffic_secret_len = 0;
- uint8_t read_traffic_secret_len = 0;
- uint8_t exporter_secret_len = 0;
- uint8_t early_exporter_secret_len = 0;
-
- // Connection binding to prevent renegotiation attacks
- uint8_t previous_client_finished[12] = {0};
- uint8_t previous_client_finished_len = 0;
- uint8_t previous_server_finished_len = 0;
- uint8_t previous_server_finished[12] = {0};
-
- uint8_t send_alert[2] = {0};
-
- // established_session is the session established by the connection. This
- // session is only filled upon the completion of the handshake and is
- // immutable.
- UniquePtr<SSL_SESSION> established_session;
-
- // Next protocol negotiation. For the client, this is the protocol that we
- // sent in NextProtocol and is set when handling ServerHello extensions.
- //
- // For a server, this is the client's selected_protocol from NextProtocol and
- // is set when handling the NextProtocol message, before the Finished
- // message.
- Array<uint8_t> next_proto_negotiated;
-
- // ALPN information
- // (we are in the process of transitioning from NPN to ALPN.)
-
- // In a server these point to the selected ALPN protocol after the
- // ClientHello has been processed. In a client these contain the protocol
- // that the server selected once the ServerHello has been processed.
- Array<uint8_t> alpn_selected;
-
- // hostname, on the server, is the value of the SNI extension.
- UniquePtr<char> hostname;
-
- // For a server:
- // If |channel_id_valid| is true, then this contains the
- // verified Channel ID from the client: a P256 point, (x,y), where
- // each are big-endian values.
- uint8_t channel_id[64] = {0};
-
- // Contains the QUIC transport params received by the peer.
- Array<uint8_t> peer_quic_transport_params;
-
- // srtp_profile is the selected SRTP protection profile for
- // DTLS-SRTP.
- const SRTP_PROTECTION_PROFILE *srtp_profile = nullptr;
- };
-
- // lengths of messages
- #define DTLS1_COOKIE_LENGTH 256
-
- #define DTLS1_RT_HEADER_LENGTH 13
-
- #define DTLS1_HM_HEADER_LENGTH 12
-
- #define DTLS1_CCS_HEADER_LENGTH 1
-
- #define DTLS1_AL_HEADER_LENGTH 2
-
- struct hm_header_st {
- uint8_t type;
- uint32_t msg_len;
- uint16_t seq;
- uint32_t frag_off;
- uint32_t frag_len;
- };
-
- // An hm_fragment is an incoming DTLS message, possibly not yet assembled.
- struct hm_fragment {
- static constexpr bool kAllowUniquePtr = true;
-
- hm_fragment() {}
- hm_fragment(const hm_fragment &) = delete;
- hm_fragment &operator=(const hm_fragment &) = delete;
-
- ~hm_fragment();
-
- // type is the type of the message.
- uint8_t type = 0;
- // seq is the sequence number of this message.
- uint16_t seq = 0;
- // msg_len is the length of the message body.
- uint32_t msg_len = 0;
- // data is a pointer to the message, including message header. It has length
- // |DTLS1_HM_HEADER_LENGTH| + |msg_len|.
- uint8_t *data = nullptr;
- // reassembly is a bitmask of |msg_len| bits corresponding to which parts of
- // the message have been received. It is NULL if the message is complete.
- uint8_t *reassembly = nullptr;
- };
-
- struct OPENSSL_timeval {
- uint64_t tv_sec;
- uint32_t tv_usec;
- };
-
- struct DTLS1_STATE {
- static constexpr bool kAllowUniquePtr = true;
-
- DTLS1_STATE();
- ~DTLS1_STATE();
-
- // has_change_cipher_spec is true if we have received a ChangeCipherSpec from
- // the peer in this epoch.
- bool has_change_cipher_spec:1;
-
- // outgoing_messages_complete is true if |outgoing_messages| has been
- // completed by an attempt to flush it. Future calls to |add_message| and
- // |add_change_cipher_spec| will start a new flight.
- bool outgoing_messages_complete:1;
-
- // flight_has_reply is true if the current outgoing flight is complete and has
- // processed at least one message. This is used to detect whether we or the
- // peer sent the final flight.
- bool flight_has_reply:1;
-
- uint8_t cookie[DTLS1_COOKIE_LENGTH] = {0};
- size_t cookie_len = 0;
-
- // The current data and handshake epoch. This is initially undefined, and
- // starts at zero once the initial handshake is completed.
- uint16_t r_epoch = 0;
- uint16_t w_epoch = 0;
-
- // records being received in the current epoch
- DTLS1_BITMAP bitmap;
-
- uint16_t handshake_write_seq = 0;
- uint16_t handshake_read_seq = 0;
-
- // save last sequence number for retransmissions
- uint8_t last_write_sequence[8] = {0};
- UniquePtr<SSLAEADContext> last_aead_write_ctx;
-
- // incoming_messages is a ring buffer of incoming handshake messages that have
- // yet to be processed. The front of the ring buffer is message number
- // |handshake_read_seq|, at position |handshake_read_seq| %
- // |SSL_MAX_HANDSHAKE_FLIGHT|.
- UniquePtr<hm_fragment> incoming_messages[SSL_MAX_HANDSHAKE_FLIGHT];
-
- // outgoing_messages is the queue of outgoing messages from the last handshake
- // flight.
- DTLS_OUTGOING_MESSAGE outgoing_messages[SSL_MAX_HANDSHAKE_FLIGHT];
- uint8_t outgoing_messages_len = 0;
-
- // outgoing_written is the number of outgoing messages that have been
- // written.
- uint8_t outgoing_written = 0;
- // outgoing_offset is the number of bytes of the next outgoing message have
- // been written.
- uint32_t outgoing_offset = 0;
-
- unsigned mtu = 0; // max DTLS packet size
-
- // num_timeouts is the number of times the retransmit timer has fired since
- // the last time it was reset.
- unsigned num_timeouts = 0;
-
- // Indicates when the last handshake msg or heartbeat sent will
- // timeout.
- struct OPENSSL_timeval next_timeout = {0, 0};
-
- // timeout_duration_ms is the timeout duration in milliseconds.
- unsigned timeout_duration_ms = 0;
- };
-
- // SSL_CONFIG contains configuration bits that can be shed after the handshake
- // completes. Objects of this type are not shared; they are unique to a
- // particular |SSL|.
- //
- // See SSL_shed_handshake_config() for more about the conditions under which
- // configuration can be shed.
- struct SSL_CONFIG {
- static constexpr bool kAllowUniquePtr = true;
-
- explicit SSL_CONFIG(SSL *ssl_arg);
- ~SSL_CONFIG();
-
- // ssl is a non-owning pointer to the parent |SSL| object.
- SSL *const ssl = nullptr;
-
- // conf_max_version is the maximum acceptable protocol version configured by
- // |SSL_set_max_proto_version|. Note this version is normalized in DTLS and is
- // further constrainted by |SSL_OP_NO_*|.
- uint16_t conf_max_version = 0;
-
- // conf_min_version is the minimum acceptable protocol version configured by
- // |SSL_set_min_proto_version|. Note this version is normalized in DTLS and is
- // further constrainted by |SSL_OP_NO_*|.
- uint16_t conf_min_version = 0;
-
- X509_VERIFY_PARAM *param = nullptr;
-
- // crypto
- UniquePtr<SSLCipherPreferenceList> cipher_list;
-
- // This is used to hold the local certificate used (i.e. the server
- // certificate for a server or the client certificate for a client).
- UniquePtr<CERT> cert;
-
- int (*verify_callback)(int ok,
- X509_STORE_CTX *ctx) =
- nullptr; // fail if callback returns 0
-
- enum ssl_verify_result_t (*custom_verify_callback)(
- SSL *ssl, uint8_t *out_alert) = nullptr;
- // Server-only: psk_identity_hint is the identity hint to send in
- // PSK-based key exchanges.
- UniquePtr<char> psk_identity_hint;
-
- unsigned (*psk_client_callback)(SSL *ssl, const char *hint, char *identity,
- unsigned max_identity_len, uint8_t *psk,
- unsigned max_psk_len) = nullptr;
- unsigned (*psk_server_callback)(SSL *ssl, const char *identity, uint8_t *psk,
- unsigned max_psk_len) = nullptr;
-
- // for server side, keep the list of CA_dn we can use
- UniquePtr<STACK_OF(CRYPTO_BUFFER)> client_CA;
-
- // cached_x509_client_CA is a cache of parsed versions of the elements of
- // |client_CA|.
- STACK_OF(X509_NAME) *cached_x509_client_CA = nullptr;
-
- uint16_t dummy_pq_padding_len = 0;
- Array<uint16_t> supported_group_list; // our list
-
- // The client's Channel ID private key.
- UniquePtr<EVP_PKEY> channel_id_private;
-
- // For a client, this contains the list of supported protocols in wire
- // format.
- Array<uint8_t> alpn_client_proto_list;
-
- // Contains a list of supported Token Binding key parameters.
- Array<uint8_t> token_binding_params;
-
- // Contains the QUIC transport params that this endpoint will send.
- Array<uint8_t> quic_transport_params;
-
- // verify_sigalgs, if not empty, is the set of signature algorithms
- // accepted from the peer in decreasing order of preference.
- Array<uint16_t> verify_sigalgs;
-
- // srtp_profiles is the list of configured SRTP protection profiles for
- // DTLS-SRTP.
- UniquePtr<STACK_OF(SRTP_PROTECTION_PROFILE)> srtp_profiles;
-
- // verify_mode is a bitmask of |SSL_VERIFY_*| values.
- uint8_t verify_mode = SSL_VERIFY_NONE;
-
- // Enable signed certificate time stamps. Currently client only.
- bool signed_cert_timestamps_enabled:1;
-
- // ocsp_stapling_enabled is only used by client connections and indicates
- // whether OCSP stapling will be requested.
- bool ocsp_stapling_enabled:1;
-
- // channel_id_enabled is copied from the |SSL_CTX|. For a server, means that
- // we'll accept Channel IDs from clients. For a client, means that we'll
- // advertise support.
- bool channel_id_enabled:1;
-
- // retain_only_sha256_of_client_certs is true if we should compute the SHA256
- // hash of the peer's certificate and then discard it to save memory and
- // session space. Only effective on the server side.
- bool retain_only_sha256_of_client_certs:1;
-
- // handoff indicates that a server should stop after receiving the
- // ClientHello and pause the handshake in such a way that |SSL_get_error|
- // returns |SSL_HANDOFF|. This is copied in |SSL_new| from the |SSL_CTX|
- // element of the same name and may be cleared if the handoff is declined.
- bool handoff:1;
-
- // shed_handshake_config indicates that the handshake config (this object!)
- // should be freed after the handshake completes.
- bool shed_handshake_config : 1;
- };
-
- // From draft-ietf-tls-tls13-18, used in determining PSK modes.
- #define SSL_PSK_DHE_KE 0x1
-
- // From draft-ietf-tls-tls13-16, used in determining whether to respond with a
- // KeyUpdate.
- #define SSL_KEY_UPDATE_NOT_REQUESTED 0
- #define SSL_KEY_UPDATE_REQUESTED 1
-
- // kMaxEarlyDataAccepted is the advertised number of plaintext bytes of early
- // data that will be accepted. This value should be slightly below
- // kMaxEarlyDataSkipped in tls_record.c, which is measured in ciphertext.
- static const size_t kMaxEarlyDataAccepted = 14336;
-
- UniquePtr<CERT> ssl_cert_dup(CERT *cert);
- void ssl_cert_clear_certs(CERT *cert);
- int ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer);
- int ssl_is_key_type_supported(int key_type);
- // ssl_compare_public_and_private_key returns one if |pubkey| is the public
- // counterpart to |privkey|. Otherwise it returns zero and pushes a helpful
- // message on the error queue.
- int ssl_compare_public_and_private_key(const EVP_PKEY *pubkey,
- const EVP_PKEY *privkey);
- int ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey);
- int ssl_get_new_session(SSL_HANDSHAKE *hs, int is_server);
- int ssl_encrypt_ticket(SSL_HANDSHAKE *hs, CBB *out, const SSL_SESSION *session);
- int ssl_ctx_rotate_ticket_encryption_key(SSL_CTX *ctx);
-
- // ssl_session_new returns a newly-allocated blank |SSL_SESSION| or nullptr on
- // error.
- UniquePtr<SSL_SESSION> ssl_session_new(const SSL_X509_METHOD *x509_method);
-
- // ssl_hash_session_id returns a hash of |session_id|, suitable for a hash table
- // keyed on session IDs.
- uint32_t ssl_hash_session_id(Span<const uint8_t> session_id);
-
- // SSL_SESSION_parse parses an |SSL_SESSION| from |cbs| and advances |cbs| over
- // the parsed data.
- OPENSSL_EXPORT UniquePtr<SSL_SESSION> SSL_SESSION_parse(
- CBS *cbs, const SSL_X509_METHOD *x509_method, CRYPTO_BUFFER_POOL *pool);
-
- // ssl_session_serialize writes |in| to |cbb| as if it were serialising a
- // session for Session-ID resumption. It returns one on success and zero on
- // error.
- OPENSSL_EXPORT int ssl_session_serialize(const SSL_SESSION *in, CBB *cbb);
-
- // ssl_session_is_context_valid returns one if |session|'s session ID context
- // matches the one set on |hs| and zero otherwise.
- int ssl_session_is_context_valid(const SSL_HANDSHAKE *hs,
- const SSL_SESSION *session);
-
- // ssl_session_is_time_valid returns one if |session| is still valid and zero if
- // it has expired.
- int ssl_session_is_time_valid(const SSL *ssl, const SSL_SESSION *session);
-
- // ssl_session_is_resumable returns one if |session| is resumable for |hs| and
- // zero otherwise.
- int ssl_session_is_resumable(const SSL_HANDSHAKE *hs,
- const SSL_SESSION *session);
-
- // ssl_session_protocol_version returns the protocol version associated with
- // |session|. Note that despite the name, this is not the same as
- // |SSL_SESSION_get_protocol_version|. The latter is based on upstream's name.
- uint16_t ssl_session_protocol_version(const SSL_SESSION *session);
-
- // ssl_session_get_digest returns the digest used in |session|.
- const EVP_MD *ssl_session_get_digest(const SSL_SESSION *session);
-
- void ssl_set_session(SSL *ssl, SSL_SESSION *session);
-
- // ssl_get_prev_session looks up the previous session based on |client_hello|.
- // On success, it sets |*out_session| to the session or nullptr if none was
- // found. If the session could not be looked up synchronously, it returns
- // |ssl_hs_pending_session| and should be called again. If a ticket could not be
- // decrypted immediately it returns |ssl_hs_pending_ticket| and should also
- // be called again. Otherwise, it returns |ssl_hs_error|.
- enum ssl_hs_wait_t ssl_get_prev_session(SSL_HANDSHAKE *hs,
- UniquePtr<SSL_SESSION> *out_session,
- bool *out_tickets_supported,
- bool *out_renew_ticket,
- const SSL_CLIENT_HELLO *client_hello);
-
- // The following flags determine which parts of the session are duplicated.
- #define SSL_SESSION_DUP_AUTH_ONLY 0x0
- #define SSL_SESSION_INCLUDE_TICKET 0x1
- #define SSL_SESSION_INCLUDE_NONAUTH 0x2
- #define SSL_SESSION_DUP_ALL \
- (SSL_SESSION_INCLUDE_TICKET | SSL_SESSION_INCLUDE_NONAUTH)
-
- // SSL_SESSION_dup returns a newly-allocated |SSL_SESSION| with a copy of the
- // fields in |session| or nullptr on error. The new session is non-resumable and
- // must be explicitly marked resumable once it has been filled in.
- OPENSSL_EXPORT UniquePtr<SSL_SESSION> SSL_SESSION_dup(SSL_SESSION *session,
- int dup_flags);
-
- // ssl_session_rebase_time updates |session|'s start time to the current time,
- // adjusting the timeout so the expiration time is unchanged.
- void ssl_session_rebase_time(SSL *ssl, SSL_SESSION *session);
-
- // ssl_session_renew_timeout calls |ssl_session_rebase_time| and renews
- // |session|'s timeout to |timeout| (measured from the current time). The
- // renewal is clamped to the session's auth_timeout.
- void ssl_session_renew_timeout(SSL *ssl, SSL_SESSION *session,
- uint32_t timeout);
-
- void ssl_update_cache(SSL_HANDSHAKE *hs, int mode);
-
- int ssl_send_alert(SSL *ssl, int level, int desc);
- bool ssl3_get_message(SSL *ssl, SSLMessage *out);
- ssl_open_record_t ssl3_open_handshake(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
- void ssl3_next_message(SSL *ssl);
-
- int ssl3_dispatch_alert(SSL *ssl);
- ssl_open_record_t ssl3_open_app_data(SSL *ssl, Span<uint8_t> *out,
- size_t *out_consumed, uint8_t *out_alert,
- Span<uint8_t> in);
- ssl_open_record_t ssl3_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert,
- Span<uint8_t> in);
- int ssl3_write_app_data(SSL *ssl, bool *out_needs_handshake, const uint8_t *buf,
- int len);
-
- bool ssl3_new(SSL *ssl);
- void ssl3_free(SSL *ssl);
-
- bool ssl3_init_message(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
- bool ssl3_finish_message(SSL *ssl, CBB *cbb, Array<uint8_t> *out_msg);
- bool ssl3_add_message(SSL *ssl, Array<uint8_t> msg);
- bool ssl3_add_change_cipher_spec(SSL *ssl);
- bool ssl3_add_alert(SSL *ssl, uint8_t level, uint8_t desc);
- int ssl3_flush_flight(SSL *ssl);
-
- bool dtls1_init_message(SSL *ssl, CBB *cbb, CBB *body, uint8_t type);
- bool dtls1_finish_message(SSL *ssl, CBB *cbb, Array<uint8_t> *out_msg);
- bool dtls1_add_message(SSL *ssl, Array<uint8_t> msg);
- bool dtls1_add_change_cipher_spec(SSL *ssl);
- bool dtls1_add_alert(SSL *ssl, uint8_t level, uint8_t desc);
- int dtls1_flush_flight(SSL *ssl);
-
- // ssl_add_message_cbb finishes the handshake message in |cbb| and adds it to
- // the pending flight. It returns true on success and false on error.
- bool ssl_add_message_cbb(SSL *ssl, CBB *cbb);
-
- // ssl_hash_message incorporates |msg| into the handshake hash. It returns true
- // on success and false on allocation failure.
- bool ssl_hash_message(SSL_HANDSHAKE *hs, const SSLMessage &msg);
-
- ssl_open_record_t dtls1_open_app_data(SSL *ssl, Span<uint8_t> *out,
- size_t *out_consumed, uint8_t *out_alert,
- Span<uint8_t> in);
- ssl_open_record_t dtls1_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert,
- Span<uint8_t> in);
-
- int dtls1_write_app_data(SSL *ssl, bool *out_needs_handshake,
- const uint8_t *buf, int len);
-
- // dtls1_write_record sends a record. It returns one on success and <= 0 on
- // error.
- int dtls1_write_record(SSL *ssl, int type, const uint8_t *buf, size_t len,
- enum dtls1_use_epoch_t use_epoch);
-
- int dtls1_retransmit_outgoing_messages(SSL *ssl);
- bool dtls1_parse_fragment(CBS *cbs, struct hm_header_st *out_hdr,
- CBS *out_body);
- bool dtls1_check_timeout_num(SSL *ssl);
-
- void dtls1_start_timer(SSL *ssl);
- void dtls1_stop_timer(SSL *ssl);
- bool dtls1_is_timer_expired(SSL *ssl);
- unsigned int dtls1_min_mtu(void);
-
- bool dtls1_new(SSL *ssl);
- void dtls1_free(SSL *ssl);
-
- bool dtls1_get_message(SSL *ssl, SSLMessage *out);
- ssl_open_record_t dtls1_open_handshake(SSL *ssl, size_t *out_consumed,
- uint8_t *out_alert, Span<uint8_t> in);
- void dtls1_next_message(SSL *ssl);
- int dtls1_dispatch_alert(SSL *ssl);
-
- // tls1_configure_aead configures either the read or write direction AEAD (as
- // determined by |direction|) using the keys generated by the TLS KDF. The
- // |key_block_cache| argument is used to store the generated key block, if
- // empty. Otherwise it's assumed that the key block is already contained within
- // it. Returns one on success or zero on error.
- int tls1_configure_aead(SSL *ssl, evp_aead_direction_t direction,
- Array<uint8_t> *key_block_cache,
- const SSL_CIPHER *cipher,
- Span<const uint8_t> iv_override);
-
- int tls1_change_cipher_state(SSL_HANDSHAKE *hs, evp_aead_direction_t direction);
- int tls1_generate_master_secret(SSL_HANDSHAKE *hs, uint8_t *out,
- Span<const uint8_t> premaster);
-
- // tls1_get_grouplist returns the locally-configured group preference list.
- Span<const uint16_t> tls1_get_grouplist(const SSL_HANDSHAKE *ssl);
-
- // tls1_check_group_id returns whether |group_id| is consistent with locally-
- // configured group preferences.
- bool tls1_check_group_id(const SSL_HANDSHAKE *ssl, uint16_t group_id);
-
- // tls1_get_shared_group sets |*out_group_id| to the first preferred shared
- // group between client and server preferences and returns true. If none may be
- // found, it returns false.
- bool tls1_get_shared_group(SSL_HANDSHAKE *hs, uint16_t *out_group_id);
-
- // tls1_set_curves converts the array of NIDs in |curves| into a newly allocated
- // array of TLS group IDs. On success, the function returns true and writes the
- // array to |*out_group_ids|. Otherwise, it returns false.
- bool tls1_set_curves(Array<uint16_t> *out_group_ids, Span<const int> curves);
-
- // tls1_set_curves_list converts the string of curves pointed to by |curves|
- // into a newly allocated array of TLS group IDs. On success, the function
- // returns true and writes the array to |*out_group_ids|. Otherwise, it returns
- // false.
- bool tls1_set_curves_list(Array<uint16_t> *out_group_ids, const char *curves);
-
- // ssl_add_clienthello_tlsext writes ClientHello extensions to |out|. It returns
- // true on success and false on failure. The |header_len| argument is the length
- // of the ClientHello written so far and is used to compute the padding length.
- // (It does not include the record header.)
- bool ssl_add_clienthello_tlsext(SSL_HANDSHAKE *hs, CBB *out, size_t header_len);
-
- bool ssl_add_serverhello_tlsext(SSL_HANDSHAKE *hs, CBB *out);
- bool ssl_parse_clienthello_tlsext(SSL_HANDSHAKE *hs,
- const SSL_CLIENT_HELLO *client_hello);
- bool ssl_parse_serverhello_tlsext(SSL_HANDSHAKE *hs, CBS *cbs);
-
- #define tlsext_tick_md EVP_sha256
-
- // ssl_process_ticket processes a session ticket from the client. It returns
- // one of:
- // |ssl_ticket_aead_success|: |*out_session| is set to the parsed session and
- // |*out_renew_ticket| is set to whether the ticket should be renewed.
- // |ssl_ticket_aead_ignore_ticket|: |*out_renew_ticket| is set to whether a
- // fresh ticket should be sent, but the given ticket cannot be used.
- // |ssl_ticket_aead_retry|: the ticket could not be immediately decrypted.
- // Retry later.
- // |ssl_ticket_aead_error|: an error occured that is fatal to the connection.
- enum ssl_ticket_aead_result_t ssl_process_ticket(
- SSL_HANDSHAKE *hs, UniquePtr<SSL_SESSION> *out_session,
- bool *out_renew_ticket, const uint8_t *ticket, size_t ticket_len,
- const uint8_t *session_id, size_t session_id_len);
-
- // tls1_verify_channel_id processes |msg| as a Channel ID message, and verifies
- // the signature. If the key is valid, it saves the Channel ID and returns true.
- // Otherwise, it returns false.
- bool tls1_verify_channel_id(SSL_HANDSHAKE *hs, const SSLMessage &msg);
-
- // tls1_write_channel_id generates a Channel ID message and puts the output in
- // |cbb|. |ssl->channel_id_private| must already be set before calling. This
- // function returns true on success and false on error.
- bool tls1_write_channel_id(SSL_HANDSHAKE *hs, CBB *cbb);
-
- // tls1_channel_id_hash computes the hash to be signed by Channel ID and writes
- // it to |out|, which must contain at least |EVP_MAX_MD_SIZE| bytes. It returns
- // true on success and false on failure.
- bool tls1_channel_id_hash(SSL_HANDSHAKE *hs, uint8_t *out, size_t *out_len);
-
- // tls1_record_handshake_hashes_for_channel_id records the current handshake
- // hashes in |hs->new_session| so that Channel ID resumptions can sign that
- // data.
- bool tls1_record_handshake_hashes_for_channel_id(SSL_HANDSHAKE *hs);
-
- // ssl_do_channel_id_callback checks runs |hs->ssl->ctx->channel_id_cb| if
- // necessary. It returns true on success and false on fatal error. Note that, on
- // success, |hs->ssl->channel_id_private| may be unset, in which case the
- // operation should be retried later.
- bool ssl_do_channel_id_callback(SSL_HANDSHAKE *hs);
-
- // ssl_can_write returns whether |ssl| is allowed to write.
- bool ssl_can_write(const SSL *ssl);
-
- // ssl_can_read returns wheter |ssl| is allowed to read.
- bool ssl_can_read(const SSL *ssl);
-
- void ssl_get_current_time(const SSL *ssl, struct OPENSSL_timeval *out_clock);
- void ssl_ctx_get_current_time(const SSL_CTX *ctx,
- struct OPENSSL_timeval *out_clock);
-
- // ssl_reset_error_state resets state for |SSL_get_error|.
- void ssl_reset_error_state(SSL *ssl);
-
- // ssl_set_read_error sets |ssl|'s read half into an error state, saving the
- // current state of the error queue.
- void ssl_set_read_error(SSL* ssl);
-
- } // namespace bssl
-
-
- // Opaque C types.
- //
- // The following types are exported to C code as public typedefs, so they must
- // be defined outside of the namespace.
-
- // ssl_method_st backs the public |SSL_METHOD| type. It is a compatibility
- // structure to support the legacy version-locked methods.
- struct ssl_method_st {
- // version, if non-zero, is the only protocol version acceptable to an
- // SSL_CTX initialized from this method.
- uint16_t version;
- // method is the underlying SSL_PROTOCOL_METHOD that initializes the
- // SSL_CTX.
- const bssl::SSL_PROTOCOL_METHOD *method;
- // x509_method contains pointers to functions that might deal with |X509|
- // compatibility, or might be a no-op, depending on the application.
- const bssl::SSL_X509_METHOD *x509_method;
- };
-
- struct ssl_ctx_st {
- explicit ssl_ctx_st(const SSL_METHOD *ssl_method);
- ssl_ctx_st(const ssl_ctx_st &) = delete;
- ssl_ctx_st &operator=(const ssl_ctx_st &) = delete;
-
- const bssl::SSL_PROTOCOL_METHOD *method = nullptr;
- const bssl::SSL_X509_METHOD *x509_method = nullptr;
-
- // lock is used to protect various operations on this object.
- CRYPTO_MUTEX lock;
-
- // conf_max_version is the maximum acceptable protocol version configured by
- // |SSL_CTX_set_max_proto_version|. Note this version is normalized in DTLS
- // and is further constrainted by |SSL_OP_NO_*|.
- uint16_t conf_max_version = 0;
-
- // conf_min_version is the minimum acceptable protocol version configured by
- // |SSL_CTX_set_min_proto_version|. Note this version is normalized in DTLS
- // and is further constrainted by |SSL_OP_NO_*|.
- uint16_t conf_min_version = 0;
-
- // tls13_variant is the variant of TLS 1.3 we are using for this
- // configuration.
- tls13_variant_t tls13_variant = tls13_default;
-
- bssl::UniquePtr<bssl::SSLCipherPreferenceList> cipher_list;
-
- X509_STORE *cert_store = nullptr;
- LHASH_OF(SSL_SESSION) *sessions = nullptr;
- // Most session-ids that will be cached, default is
- // SSL_SESSION_CACHE_MAX_SIZE_DEFAULT. 0 is unlimited.
- unsigned long session_cache_size = SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
- SSL_SESSION *session_cache_head = nullptr;
- SSL_SESSION *session_cache_tail = nullptr;
-
- // handshakes_since_cache_flush is the number of successful handshakes since
- // the last cache flush.
- int handshakes_since_cache_flush = 0;
-
- // This can have one of 2 values, ored together,
- // SSL_SESS_CACHE_CLIENT,
- // SSL_SESS_CACHE_SERVER,
- // Default is SSL_SESSION_CACHE_SERVER, which means only
- // SSL_accept which cache SSL_SESSIONS.
- int session_cache_mode = SSL_SESS_CACHE_SERVER;
-
- // session_timeout is the default lifetime for new sessions in TLS 1.2 and
- // earlier, in seconds.
- uint32_t session_timeout = SSL_DEFAULT_SESSION_TIMEOUT;
-
- // session_psk_dhe_timeout is the default lifetime for new sessions in TLS
- // 1.3, in seconds.
- uint32_t session_psk_dhe_timeout = SSL_DEFAULT_SESSION_PSK_DHE_TIMEOUT;
-
- // If this callback is not null, it will be called each time a session id is
- // added to the cache. If this function returns 1, it means that the
- // callback will do a SSL_SESSION_free() when it has finished using it.
- // Otherwise, on 0, it means the callback has finished with it. If
- // remove_session_cb is not null, it will be called when a session-id is
- // removed from the cache. After the call, OpenSSL will SSL_SESSION_free()
- // it.
- int (*new_session_cb)(SSL *ssl, SSL_SESSION *sess) = nullptr;
- void (*remove_session_cb)(SSL_CTX *ctx, SSL_SESSION *sess) = nullptr;
- SSL_SESSION *(*get_session_cb)(SSL *ssl, const uint8_t *data, int len,
- int *copy) = nullptr;
-
- CRYPTO_refcount_t references = 1;
-
- // if defined, these override the X509_verify_cert() calls
- int (*app_verify_callback)(X509_STORE_CTX *store_ctx, void *arg) = nullptr;
- void *app_verify_arg = nullptr;
-
- ssl_verify_result_t (*custom_verify_callback)(SSL *ssl,
- uint8_t *out_alert) = nullptr;
-
- // Default password callback.
- pem_password_cb *default_passwd_callback = nullptr;
-
- // Default password callback user data.
- void *default_passwd_callback_userdata = nullptr;
-
- // get client cert callback
- int (*client_cert_cb)(SSL *ssl, X509 **out_x509, EVP_PKEY **out_pkey) = nullptr;
-
- // get channel id callback
- void (*channel_id_cb)(SSL *ssl, EVP_PKEY **out_pkey) = nullptr;
-
- CRYPTO_EX_DATA ex_data;
-
- // Default values used when no per-SSL value is defined follow
-
- void (*info_callback)(const SSL *ssl, int type, int value) = nullptr;
-
- // what we put in client cert requests
- bssl::UniquePtr<STACK_OF(CRYPTO_BUFFER)> client_CA;
-
- // cached_x509_client_CA is a cache of parsed versions of the elements of
- // |client_CA|.
- STACK_OF(X509_NAME) *cached_x509_client_CA = nullptr;
-
-
- // Default values to use in SSL structures follow (these are copied by
- // SSL_new)
-
- uint32_t options = 0;
- // Disable the auto-chaining feature by default. wpa_supplicant relies on this
- // feature, but require callers opt into it.
- uint32_t mode = SSL_MODE_NO_AUTO_CHAIN;
- uint32_t max_cert_list = SSL_MAX_CERT_LIST_DEFAULT;
-
- bssl::UniquePtr<bssl::CERT> cert;
-
- // callback that allows applications to peek at protocol messages
- void (*msg_callback)(int write_p, int version, int content_type,
- const void *buf, size_t len, SSL *ssl, void *arg) = nullptr;
- void *msg_callback_arg = nullptr;
-
- int verify_mode = SSL_VERIFY_NONE;
- int (*default_verify_callback)(int ok, X509_STORE_CTX *ctx) =
- nullptr; // called 'verify_callback' in the SSL
-
- X509_VERIFY_PARAM *param = nullptr;
-
- // select_certificate_cb is called before most ClientHello processing and
- // before the decision whether to resume a session is made. See
- // |ssl_select_cert_result_t| for details of the return values.
- ssl_select_cert_result_t (*select_certificate_cb)(const SSL_CLIENT_HELLO *) =
- nullptr;
-
- // dos_protection_cb is called once the resumption decision for a ClientHello
- // has been made. It returns one to continue the handshake or zero to
- // abort.
- int (*dos_protection_cb) (const SSL_CLIENT_HELLO *) = nullptr;
-
- // Maximum amount of data to send in one fragment. actual record size can be
- // more than this due to padding and MAC overheads.
- uint16_t max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
-
- // TLS extensions servername callback
- int (*servername_callback)(SSL *, int *, void *) = nullptr;
- void *servername_arg = nullptr;
-
- // RFC 4507 session ticket keys. |ticket_key_current| may be NULL before the
- // first handshake and |ticket_key_prev| may be NULL at any time.
- // Automatically generated ticket keys are rotated as needed at handshake
- // time. Hence, all access must be synchronized through |lock|.
- bssl::UniquePtr<bssl::TicketKey> ticket_key_current;
- bssl::UniquePtr<bssl::TicketKey> ticket_key_prev;
-
- // Callback to support customisation of ticket key setting
- int (*ticket_key_cb)(SSL *ssl, uint8_t *name, uint8_t *iv,
- EVP_CIPHER_CTX *ectx, HMAC_CTX *hctx, int enc) = nullptr;
-
- // Server-only: psk_identity_hint is the default identity hint to send in
- // PSK-based key exchanges.
- bssl::UniquePtr<char> psk_identity_hint;
-
- unsigned (*psk_client_callback)(SSL *ssl, const char *hint, char *identity,
- unsigned max_identity_len, uint8_t *psk,
- unsigned max_psk_len) = nullptr;
- unsigned (*psk_server_callback)(SSL *ssl, const char *identity, uint8_t *psk,
- unsigned max_psk_len) = nullptr;
-
-
- // Next protocol negotiation information
- // (for experimental NPN extension).
-
- // For a server, this contains a callback function by which the set of
- // advertised protocols can be provided.
- int (*next_protos_advertised_cb)(SSL *ssl, const uint8_t **out,
- unsigned *out_len, void *arg) = nullptr;
- void *next_protos_advertised_cb_arg = nullptr;
- // For a client, this contains a callback function that selects the
- // next protocol from the list provided by the server.
- int (*next_proto_select_cb)(SSL *ssl, uint8_t **out, uint8_t *out_len,
- const uint8_t *in, unsigned in_len,
- void *arg) = nullptr;
- void *next_proto_select_cb_arg = nullptr;
-
- // ALPN information
- // (we are in the process of transitioning from NPN to ALPN.)
-
- // For a server, this contains a callback function that allows the
- // server to select the protocol for the connection.
- // out: on successful return, this must point to the raw protocol
- // name (without the length prefix).
- // outlen: on successful return, this contains the length of |*out|.
- // in: points to the client's list of supported protocols in
- // wire-format.
- // inlen: the length of |in|.
- int (*alpn_select_cb)(SSL *ssl, const uint8_t **out, uint8_t *out_len,
- const uint8_t *in, unsigned in_len,
- void *arg) = nullptr;
- void *alpn_select_cb_arg = nullptr;
-
- // For a client, this contains the list of supported protocols in wire
- // format.
- bssl::Array<uint8_t> alpn_client_proto_list;
-
- // SRTP profiles we are willing to do from RFC 5764
- bssl::UniquePtr<STACK_OF(SRTP_PROTECTION_PROFILE)> srtp_profiles;
-
- // Defined compression algorithms for certificates.
- bssl::UniquePtr<STACK_OF(CertCompressionAlg)> cert_compression_algs;
-
- // Supported group values inherited by SSL structure
- bssl::Array<uint16_t> supported_group_list;
-
- // The client's Channel ID private key.
- bssl::UniquePtr<EVP_PKEY> channel_id_private;
-
- // keylog_callback, if not NULL, is the key logging callback. See
- // |SSL_CTX_set_keylog_callback|.
- void (*keylog_callback)(const SSL *ssl, const char *line) = nullptr;
-
- // current_time_cb, if not NULL, is the function to use to get the current
- // time. It sets |*out_clock| to the current time. The |ssl| argument is
- // always NULL. See |SSL_CTX_set_current_time_cb|.
- void (*current_time_cb)(const SSL *ssl, struct timeval *out_clock) = nullptr;
-
- // pool is used for all |CRYPTO_BUFFER|s in case we wish to share certificate
- // memory.
- CRYPTO_BUFFER_POOL *pool = nullptr;
-
- // ticket_aead_method contains function pointers for opening and sealing
- // session tickets.
- const SSL_TICKET_AEAD_METHOD *ticket_aead_method = nullptr;
-
- // legacy_ocsp_callback implements an OCSP-related callback for OpenSSL
- // compatibility.
- int (*legacy_ocsp_callback)(SSL *ssl, void *arg) = nullptr;
- void *legacy_ocsp_callback_arg = nullptr;
-
- // verify_sigalgs, if not empty, is the set of signature algorithms
- // accepted from the peer in decreasing order of preference.
- bssl::Array<uint16_t> verify_sigalgs;
-
- // retain_only_sha256_of_client_certs is true if we should compute the SHA256
- // hash of the peer's certificate and then discard it to save memory and
- // session space. Only effective on the server side.
- bool retain_only_sha256_of_client_certs:1;
-
- // quiet_shutdown is true if the connection should not send a close_notify on
- // shutdown.
- bool quiet_shutdown:1;
-
- // ocsp_stapling_enabled is only used by client connections and indicates
- // whether OCSP stapling will be requested.
- bool ocsp_stapling_enabled:1;
-
- // If true, a client will request certificate timestamps.
- bool signed_cert_timestamps_enabled:1;
-
- // channel_id_enabled is whether Channel ID is enabled. For a server, means
- // that we'll accept Channel IDs from clients. For a client, means that we'll
- // advertise support.
- bool channel_id_enabled:1;
-
- // grease_enabled is whether draft-davidben-tls-grease-01 is enabled.
- bool grease_enabled:1;
-
- // allow_unknown_alpn_protos is whether the client allows unsolicited ALPN
- // protocols from the peer.
- bool allow_unknown_alpn_protos:1;
-
- // ed25519_enabled is whether Ed25519 is advertised in the handshake.
- bool ed25519_enabled:1;
-
- // rsa_pss_rsae_certs_enabled is whether rsa_pss_rsae_* are supported by the
- // certificate verifier.
- bool rsa_pss_rsae_certs_enabled:1;
-
- // false_start_allowed_without_alpn is whether False Start (if
- // |SSL_MODE_ENABLE_FALSE_START| is enabled) is allowed without ALPN.
- bool false_start_allowed_without_alpn:1;
-
- // handoff indicates that a server should stop after receiving the
- // ClientHello and pause the handshake in such a way that |SSL_get_error|
- // returns |SSL_HANDOFF|.
- bool handoff:1;
-
- // If enable_early_data is true, early data can be sent and accepted.
- bool enable_early_data : 1;
-
- private:
- ~ssl_ctx_st();
- friend void SSL_CTX_free(SSL_CTX *);
- };
-
- struct ssl_st {
- explicit ssl_st(SSL_CTX *ctx_arg);
- ssl_st(const ssl_st &) = delete;
- ssl_st &operator=(const ssl_st &) = delete;
- ~ssl_st();
-
- // method is the method table corresponding to the current protocol (DTLS or
- // TLS).
- const bssl::SSL_PROTOCOL_METHOD *method = nullptr;
-
- // config is a container for handshake configuration. Accesses to this field
- // should check for nullptr, since configuration may be shed after the
- // handshake completes. (If you have the |SSL_HANDSHAKE| object at hand, use
- // that instead, and skip the null check.)
- bssl::UniquePtr<bssl::SSL_CONFIG> config;
-
- // version is the protocol version.
- uint16_t version = 0;
-
- uint16_t max_send_fragment = 0;
-
- // There are 2 BIO's even though they are normally both the same. This is so
- // data can be read and written to different handlers
-
- bssl::UniquePtr<BIO> rbio; // used by SSL_read
- bssl::UniquePtr<BIO> wbio; // used by SSL_write
-
- // do_handshake runs the handshake. On completion, it returns |ssl_hs_ok|.
- // Otherwise, it returns a value corresponding to what operation is needed to
- // progress.
- bssl::ssl_hs_wait_t (*do_handshake)(bssl::SSL_HANDSHAKE *hs) = nullptr;
-
- bssl::SSL3_STATE *s3 = nullptr; // TLS variables
- bssl::DTLS1_STATE *d1 = nullptr; // DTLS variables
-
- // callback that allows applications to peek at protocol messages
- void (*msg_callback)(int write_p, int version, int content_type,
- const void *buf, size_t len, SSL *ssl,
- void *arg) = nullptr;
- void *msg_callback_arg = nullptr;
-
- // session info
-
- // initial_timeout_duration_ms is the default DTLS timeout duration in
- // milliseconds. It's used to initialize the timer any time it's restarted.
- //
- // RFC 6347 states that implementations SHOULD use an initial timer value of 1
- // second.
- unsigned initial_timeout_duration_ms = 1000;
-
- // tls13_variant is the variant of TLS 1.3 we are using for this
- // configuration.
- tls13_variant_t tls13_variant = tls13_default;
-
- // session is the configured session to be offered by the client. This session
- // is immutable.
- bssl::UniquePtr<SSL_SESSION> session;
-
- void (*info_callback)(const SSL *ssl, int type, int value) = nullptr;
-
- bssl::UniquePtr<SSL_CTX> ctx;
-
- // session_ctx is the |SSL_CTX| used for the session cache and related
- // settings.
- bssl::UniquePtr<SSL_CTX> session_ctx;
-
- // extra application data
- CRYPTO_EX_DATA ex_data;
-
- uint32_t options = 0; // protocol behaviour
- uint32_t mode = 0; // API behaviour
- uint32_t max_cert_list = 0;
- bssl::UniquePtr<char> hostname;
-
- // renegotiate_mode controls how peer renegotiation attempts are handled.
- ssl_renegotiate_mode_t renegotiate_mode = ssl_renegotiate_never;
-
- // server is true iff the this SSL* is the server half. Note: before the SSL*
- // is initialized by either SSL_set_accept_state or SSL_set_connect_state,
- // the side is not determined. In this state, server is always false.
- bool server : 1;
-
- // quiet_shutdown is true if the connection should not send a close_notify on
- // shutdown.
- bool quiet_shutdown : 1;
-
- // did_dummy_pq_padding is only valid for a client. In that context, it is
- // true iff the client observed the server echoing a dummy PQ padding
- // extension.
- bool did_dummy_pq_padding:1;
-
- // If enable_early_data is true, early data can be sent and accepted.
- bool enable_early_data : 1;
- };
-
- struct ssl_session_st {
- explicit ssl_session_st(const bssl::SSL_X509_METHOD *method);
- ssl_session_st(const ssl_session_st &) = delete;
- ssl_session_st &operator=(const ssl_session_st &) = delete;
-
- CRYPTO_refcount_t references = 1;
- uint16_t ssl_version = 0; // what ssl version session info is being kept in here?
-
- // group_id is the ID of the ECDH group used to establish this session or zero
- // if not applicable or unknown.
- uint16_t group_id = 0;
-
- // peer_signature_algorithm is the signature algorithm used to authenticate
- // the peer, or zero if not applicable or unknown.
- uint16_t peer_signature_algorithm = 0;
-
- // master_key, in TLS 1.2 and below, is the master secret associated with the
- // session. In TLS 1.3 and up, it is the resumption secret.
- int master_key_length = 0;
- uint8_t master_key[SSL_MAX_MASTER_KEY_LENGTH] = {0};
-
- // session_id - valid?
- unsigned session_id_length = 0;
- uint8_t session_id[SSL_MAX_SSL_SESSION_ID_LENGTH] = {0};
- // this is used to determine whether the session is being reused in
- // the appropriate context. It is up to the application to set this,
- // via SSL_new
- uint8_t sid_ctx_length = 0;
- uint8_t sid_ctx[SSL_MAX_SID_CTX_LENGTH] = {0};
-
- bssl::UniquePtr<char> psk_identity;
-
- // certs contains the certificate chain from the peer, starting with the leaf
- // certificate.
- bssl::UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs;
-
- const bssl::SSL_X509_METHOD *x509_method = nullptr;
-
- // x509_peer is the peer's certificate.
- X509 *x509_peer = nullptr;
-
- // x509_chain is the certificate chain sent by the peer. NOTE: for historical
- // reasons, when a client (so the peer is a server), the chain includes
- // |peer|, but when a server it does not.
- STACK_OF(X509) *x509_chain = nullptr;
-
- // x509_chain_without_leaf is a lazily constructed copy of |x509_chain| that
- // omits the leaf certificate. This exists because OpenSSL, historically,
- // didn't include the leaf certificate in the chain for a server, but did for
- // a client. The |x509_chain| always includes it and, if an API call requires
- // a chain without, it is stored here.
- STACK_OF(X509) *x509_chain_without_leaf = nullptr;
-
- // verify_result is the result of certificate verification in the case of
- // non-fatal certificate errors.
- long verify_result = X509_V_ERR_INVALID_CALL;
-
- // timeout is the lifetime of the session in seconds, measured from |time|.
- // This is renewable up to |auth_timeout|.
- uint32_t timeout = SSL_DEFAULT_SESSION_TIMEOUT;
-
- // auth_timeout is the non-renewable lifetime of the session in seconds,
- // measured from |time|.
- uint32_t auth_timeout = SSL_DEFAULT_SESSION_TIMEOUT;
-
- // time is the time the session was issued, measured in seconds from the UNIX
- // epoch.
- uint64_t time = 0;
-
- const SSL_CIPHER *cipher = nullptr;
-
- CRYPTO_EX_DATA ex_data; // application specific data
-
- // These are used to make removal of session-ids more efficient and to
- // implement a maximum cache size.
- SSL_SESSION *prev = nullptr, *next = nullptr;
-
- bssl::Array<uint8_t> ticket;
-
- bssl::UniquePtr<CRYPTO_BUFFER> signed_cert_timestamp_list;
-
- // The OCSP response that came with the session.
- bssl::UniquePtr<CRYPTO_BUFFER> ocsp_response;
-
- // peer_sha256 contains the SHA-256 hash of the peer's certificate if
- // |peer_sha256_valid| is true.
- uint8_t peer_sha256[SHA256_DIGEST_LENGTH] = {0};
-
- // original_handshake_hash contains the handshake hash (either SHA-1+MD5 or
- // SHA-2, depending on TLS version) for the original, full handshake that
- // created a session. This is used by Channel IDs during resumption.
- uint8_t original_handshake_hash[EVP_MAX_MD_SIZE] = {0};
- uint8_t original_handshake_hash_len = 0;
-
- uint32_t ticket_lifetime_hint = 0; // Session lifetime hint in seconds
-
- uint32_t ticket_age_add = 0;
-
- // ticket_max_early_data is the maximum amount of data allowed to be sent as
- // early data. If zero, 0-RTT is disallowed.
- uint32_t ticket_max_early_data = 0;
-
- // early_alpn is the ALPN protocol from the initial handshake. This is only
- // stored for TLS 1.3 and above in order to enforce ALPN matching for 0-RTT
- // resumptions.
- bssl::Array<uint8_t> early_alpn;
-
- // extended_master_secret is whether the master secret in this session was
- // generated using EMS and thus isn't vulnerable to the Triple Handshake
- // attack.
- bool extended_master_secret:1;
-
- // peer_sha256_valid is whether |peer_sha256| is valid.
- bool peer_sha256_valid:1; // Non-zero if peer_sha256 is valid
-
- // not_resumable is used to indicate that session resumption is disallowed.
- bool not_resumable:1;
-
- // ticket_age_add_valid is whether |ticket_age_add| is valid.
- bool ticket_age_add_valid:1;
-
- // is_server is whether this session was created by a server.
- bool is_server:1;
-
- private:
- ~ssl_session_st();
- friend void SSL_SESSION_free(SSL_SESSION *);
- };
-
-
- #endif // OPENSSL_HEADER_SSL_INTERNAL_H
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