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- /* 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.] */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
-
- #include <openssl/ec.h>
- #include <openssl/ec_key.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
-
- #include "internal.h"
- #include "../crypto/internal.h"
-
-
- BSSL_NAMESPACE_BEGIN
-
- bool ssl_is_key_type_supported(int key_type) {
- return key_type == EVP_PKEY_RSA || key_type == EVP_PKEY_EC ||
- key_type == EVP_PKEY_ED25519;
- }
-
- static bool ssl_set_pkey(CERT *cert, EVP_PKEY *pkey) {
- if (!ssl_is_key_type_supported(pkey->type)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- return false;
- }
-
- if (cert->chain != nullptr &&
- sk_CRYPTO_BUFFER_value(cert->chain.get(), 0) != nullptr &&
- // Sanity-check that the private key and the certificate match.
- !ssl_cert_check_private_key(cert, pkey)) {
- return false;
- }
-
- cert->privatekey = UpRef(pkey);
- return true;
- }
-
- typedef struct {
- uint16_t sigalg;
- int pkey_type;
- int curve;
- const EVP_MD *(*digest_func)(void);
- bool is_rsa_pss;
- } SSL_SIGNATURE_ALGORITHM;
-
- static const SSL_SIGNATURE_ALGORITHM kSignatureAlgorithms[] = {
- {SSL_SIGN_RSA_PKCS1_MD5_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_md5_sha1,
- false},
- {SSL_SIGN_RSA_PKCS1_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_sha1, false},
- {SSL_SIGN_RSA_PKCS1_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256, false},
- {SSL_SIGN_RSA_PKCS1_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384, false},
- {SSL_SIGN_RSA_PKCS1_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512, false},
-
- {SSL_SIGN_RSA_PSS_RSAE_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256, true},
- {SSL_SIGN_RSA_PSS_RSAE_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384, true},
- {SSL_SIGN_RSA_PSS_RSAE_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512, true},
-
- {SSL_SIGN_ECDSA_SHA1, EVP_PKEY_EC, NID_undef, &EVP_sha1, false},
- {SSL_SIGN_ECDSA_SECP256R1_SHA256, EVP_PKEY_EC, NID_X9_62_prime256v1,
- &EVP_sha256, false},
- {SSL_SIGN_ECDSA_SECP384R1_SHA384, EVP_PKEY_EC, NID_secp384r1, &EVP_sha384,
- false},
- {SSL_SIGN_ECDSA_SECP521R1_SHA512, EVP_PKEY_EC, NID_secp521r1, &EVP_sha512,
- false},
-
- {SSL_SIGN_ED25519, EVP_PKEY_ED25519, NID_undef, nullptr, false},
- };
-
- static const SSL_SIGNATURE_ALGORITHM *get_signature_algorithm(uint16_t sigalg) {
- for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kSignatureAlgorithms); i++) {
- if (kSignatureAlgorithms[i].sigalg == sigalg) {
- return &kSignatureAlgorithms[i];
- }
- }
- return NULL;
- }
-
- bool ssl_has_private_key(const SSL_HANDSHAKE *hs) {
- if (hs->config->cert->privatekey != nullptr ||
- hs->config->cert->key_method != nullptr ||
- ssl_signing_with_dc(hs)) {
- return true;
- }
-
- return false;
- }
-
- static bool pkey_supports_algorithm(const SSL *ssl, EVP_PKEY *pkey,
- uint16_t sigalg) {
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg == NULL ||
- EVP_PKEY_id(pkey) != alg->pkey_type) {
- return false;
- }
-
- if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
- // RSA keys may only be used with RSA-PSS.
- if (alg->pkey_type == EVP_PKEY_RSA && !alg->is_rsa_pss) {
- return false;
- }
-
- // EC keys have a curve requirement.
- if (alg->pkey_type == EVP_PKEY_EC &&
- (alg->curve == NID_undef ||
- EC_GROUP_get_curve_name(
- EC_KEY_get0_group(EVP_PKEY_get0_EC_KEY(pkey))) != alg->curve)) {
- return false;
- }
- }
-
- return true;
- }
-
- static bool setup_ctx(SSL *ssl, EVP_MD_CTX *ctx, EVP_PKEY *pkey,
- uint16_t sigalg, bool is_verify) {
- if (!pkey_supports_algorithm(ssl, pkey, sigalg)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return false;
- }
-
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- const EVP_MD *digest = alg->digest_func != NULL ? alg->digest_func() : NULL;
- EVP_PKEY_CTX *pctx;
- if (is_verify) {
- if (!EVP_DigestVerifyInit(ctx, &pctx, digest, NULL, pkey)) {
- return false;
- }
- } else if (!EVP_DigestSignInit(ctx, &pctx, digest, NULL, pkey)) {
- return false;
- }
-
- if (alg->is_rsa_pss) {
- if (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
- !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1 /* salt len = hash len */)) {
- return false;
- }
- }
-
- return true;
- }
-
- 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) {
- SSL *const ssl = hs->ssl;
- const SSL_PRIVATE_KEY_METHOD *key_method = hs->config->cert->key_method;
- EVP_PKEY *privatekey = hs->config->cert->privatekey.get();
- if (ssl_signing_with_dc(hs)) {
- key_method = hs->config->cert->dc_key_method;
- privatekey = hs->config->cert->dc_privatekey.get();
- }
-
- if (key_method != NULL) {
- enum ssl_private_key_result_t ret;
- if (hs->pending_private_key_op) {
- ret = key_method->complete(ssl, out, out_len, max_out);
- } else {
- ret = key_method->sign(ssl, out, out_len, max_out,
- sigalg, in.data(), in.size());
- }
- if (ret == ssl_private_key_failure) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PRIVATE_KEY_OPERATION_FAILED);
- }
- hs->pending_private_key_op = ret == ssl_private_key_retry;
- return ret;
- }
-
- *out_len = max_out;
- ScopedEVP_MD_CTX ctx;
- if (!setup_ctx(ssl, ctx.get(), privatekey, sigalg, false /* sign */) ||
- !EVP_DigestSign(ctx.get(), out, out_len, in.data(), in.size())) {
- return ssl_private_key_failure;
- }
- return ssl_private_key_success;
- }
-
- bool ssl_public_key_verify(SSL *ssl, Span<const uint8_t> signature,
- uint16_t sigalg, EVP_PKEY *pkey,
- Span<const uint8_t> in) {
- ScopedEVP_MD_CTX ctx;
- return setup_ctx(ssl, ctx.get(), pkey, sigalg, true /* verify */) &&
- EVP_DigestVerify(ctx.get(), signature.data(), signature.size(),
- in.data(), in.size());
- }
-
- 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 *const ssl = hs->ssl;
- if (hs->config->cert->key_method != NULL) {
- enum ssl_private_key_result_t ret;
- if (hs->pending_private_key_op) {
- ret = hs->config->cert->key_method->complete(ssl, out, out_len, max_out);
- } else {
- ret = hs->config->cert->key_method->decrypt(ssl, out, out_len, max_out,
- in.data(), in.size());
- }
- if (ret == ssl_private_key_failure) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PRIVATE_KEY_OPERATION_FAILED);
- }
- hs->pending_private_key_op = ret == ssl_private_key_retry;
- return ret;
- }
-
- RSA *rsa = EVP_PKEY_get0_RSA(hs->config->cert->privatekey.get());
- if (rsa == NULL) {
- // Decrypt operations are only supported for RSA keys.
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return ssl_private_key_failure;
- }
-
- // Decrypt with no padding. PKCS#1 padding will be removed as part of the
- // timing-sensitive code by the caller.
- if (!RSA_decrypt(rsa, out_len, out, max_out, in.data(), in.size(),
- RSA_NO_PADDING)) {
- return ssl_private_key_failure;
- }
- return ssl_private_key_success;
- }
-
- bool ssl_private_key_supports_signature_algorithm(SSL_HANDSHAKE *hs,
- uint16_t sigalg) {
- SSL *const ssl = hs->ssl;
- if (!pkey_supports_algorithm(ssl, hs->local_pubkey.get(), sigalg)) {
- return false;
- }
-
- // Ensure the RSA key is large enough for the hash. RSASSA-PSS requires that
- // emLen be at least hLen + sLen + 2. Both hLen and sLen are the size of the
- // hash in TLS. Reasonable RSA key sizes are large enough for the largest
- // defined RSASSA-PSS algorithm, but 1024-bit RSA is slightly too small for
- // SHA-512. 1024-bit RSA is sometimes used for test credentials, so check the
- // size so that we can fall back to another algorithm in that case.
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg->is_rsa_pss && (size_t)EVP_PKEY_size(hs->local_pubkey.get()) <
- 2 * EVP_MD_size(alg->digest_func()) + 2) {
- return false;
- }
-
- return true;
- }
-
- BSSL_NAMESPACE_END
-
- using namespace bssl;
-
- int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa) {
- if (rsa == NULL || ssl->config == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- UniquePtr<EVP_PKEY> pkey(EVP_PKEY_new());
- if (!pkey ||
- !EVP_PKEY_set1_RSA(pkey.get(), rsa)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- return ssl_set_pkey(ssl->config->cert.get(), pkey.get());
- }
-
- int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) {
- UniquePtr<RSA> rsa(RSA_private_key_from_bytes(der, der_len));
- if (!rsa) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- return SSL_use_RSAPrivateKey(ssl, rsa.get());
- }
-
- int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey) {
- if (pkey == NULL || ssl->config == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- return ssl_set_pkey(ssl->config->cert.get(), pkey);
- }
-
- int SSL_use_PrivateKey_ASN1(int type, SSL *ssl, const uint8_t *der,
- size_t der_len) {
- if (der_len > LONG_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- const uint8_t *p = der;
- UniquePtr<EVP_PKEY> pkey(d2i_PrivateKey(type, NULL, &p, (long)der_len));
- if (!pkey || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- return SSL_use_PrivateKey(ssl, pkey.get());
- }
-
- int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa) {
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- UniquePtr<EVP_PKEY> pkey(EVP_PKEY_new());
- if (!pkey ||
- !EVP_PKEY_set1_RSA(pkey.get(), rsa)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- return ssl_set_pkey(ctx->cert.get(), pkey.get());
- }
-
- int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const uint8_t *der,
- size_t der_len) {
- UniquePtr<RSA> rsa(RSA_private_key_from_bytes(der, der_len));
- if (!rsa) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- return SSL_CTX_use_RSAPrivateKey(ctx, rsa.get());
- }
-
- int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey) {
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- return ssl_set_pkey(ctx->cert.get(), pkey);
- }
-
- int SSL_CTX_use_PrivateKey_ASN1(int type, SSL_CTX *ctx, const uint8_t *der,
- size_t der_len) {
- if (der_len > LONG_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- const uint8_t *p = der;
- UniquePtr<EVP_PKEY> pkey(d2i_PrivateKey(type, NULL, &p, (long)der_len));
- if (!pkey || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- return SSL_CTX_use_PrivateKey(ctx, pkey.get());
- }
-
- void SSL_set_private_key_method(SSL *ssl,
- const SSL_PRIVATE_KEY_METHOD *key_method) {
- if (!ssl->config) {
- return;
- }
- ssl->config->cert->key_method = key_method;
- }
-
- void SSL_CTX_set_private_key_method(SSL_CTX *ctx,
- const SSL_PRIVATE_KEY_METHOD *key_method) {
- ctx->cert->key_method = key_method;
- }
-
- static constexpr size_t kMaxSignatureAlgorithmNameLen = 23;
-
- // This was "constexpr" rather than "const", but that triggered a bug in MSVC
- // where it didn't pad the strings to the correct length.
- static const struct {
- uint16_t signature_algorithm;
- const char name[kMaxSignatureAlgorithmNameLen];
- } kSignatureAlgorithmNames[] = {
- {SSL_SIGN_RSA_PKCS1_MD5_SHA1, "rsa_pkcs1_md5_sha1"},
- {SSL_SIGN_RSA_PKCS1_SHA1, "rsa_pkcs1_sha1"},
- {SSL_SIGN_RSA_PKCS1_SHA256, "rsa_pkcs1_sha256"},
- {SSL_SIGN_RSA_PKCS1_SHA384, "rsa_pkcs1_sha384"},
- {SSL_SIGN_RSA_PKCS1_SHA512, "rsa_pkcs1_sha512"},
- {SSL_SIGN_ECDSA_SHA1, "ecdsa_sha1"},
- {SSL_SIGN_ECDSA_SECP256R1_SHA256, "ecdsa_secp256r1_sha256"},
- {SSL_SIGN_ECDSA_SECP384R1_SHA384, "ecdsa_secp384r1_sha384"},
- {SSL_SIGN_ECDSA_SECP521R1_SHA512, "ecdsa_secp521r1_sha512"},
- {SSL_SIGN_RSA_PSS_RSAE_SHA256, "rsa_pss_rsae_sha256"},
- {SSL_SIGN_RSA_PSS_RSAE_SHA384, "rsa_pss_rsae_sha384"},
- {SSL_SIGN_RSA_PSS_RSAE_SHA512, "rsa_pss_rsae_sha512"},
- {SSL_SIGN_ED25519, "ed25519"},
- };
-
- const char *SSL_get_signature_algorithm_name(uint16_t sigalg,
- int include_curve) {
- if (!include_curve) {
- switch (sigalg) {
- case SSL_SIGN_ECDSA_SECP256R1_SHA256:
- return "ecdsa_sha256";
- case SSL_SIGN_ECDSA_SECP384R1_SHA384:
- return "ecdsa_sha384";
- case SSL_SIGN_ECDSA_SECP521R1_SHA512:
- return "ecdsa_sha512";
- }
- }
-
- for (const auto &candidate : kSignatureAlgorithmNames) {
- if (candidate.signature_algorithm == sigalg) {
- return candidate.name;
- }
- }
-
- return NULL;
- }
-
- int SSL_get_signature_algorithm_key_type(uint16_t sigalg) {
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- return alg != nullptr ? alg->pkey_type : EVP_PKEY_NONE;
- }
-
- const EVP_MD *SSL_get_signature_algorithm_digest(uint16_t sigalg) {
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg == nullptr || alg->digest_func == nullptr) {
- return nullptr;
- }
- return alg->digest_func();
- }
-
- int SSL_is_signature_algorithm_rsa_pss(uint16_t sigalg) {
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- return alg != nullptr && alg->is_rsa_pss;
- }
-
- int SSL_CTX_set_signing_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
- size_t num_prefs) {
- return ctx->cert->sigalgs.CopyFrom(MakeConstSpan(prefs, num_prefs));
- }
-
- int SSL_set_signing_algorithm_prefs(SSL *ssl, const uint16_t *prefs,
- size_t num_prefs) {
- if (!ssl->config) {
- return 0;
- }
- return ssl->config->cert->sigalgs.CopyFrom(MakeConstSpan(prefs, num_prefs));
- }
-
- static constexpr struct {
- int pkey_type;
- int hash_nid;
- uint16_t signature_algorithm;
- } kSignatureAlgorithmsMapping[] = {
- {EVP_PKEY_RSA, NID_sha1, SSL_SIGN_RSA_PKCS1_SHA1},
- {EVP_PKEY_RSA, NID_sha256, SSL_SIGN_RSA_PKCS1_SHA256},
- {EVP_PKEY_RSA, NID_sha384, SSL_SIGN_RSA_PKCS1_SHA384},
- {EVP_PKEY_RSA, NID_sha512, SSL_SIGN_RSA_PKCS1_SHA512},
- {EVP_PKEY_RSA_PSS, NID_sha256, SSL_SIGN_RSA_PSS_RSAE_SHA256},
- {EVP_PKEY_RSA_PSS, NID_sha384, SSL_SIGN_RSA_PSS_RSAE_SHA384},
- {EVP_PKEY_RSA_PSS, NID_sha512, SSL_SIGN_RSA_PSS_RSAE_SHA512},
- {EVP_PKEY_EC, NID_sha1, SSL_SIGN_ECDSA_SHA1},
- {EVP_PKEY_EC, NID_sha256, SSL_SIGN_ECDSA_SECP256R1_SHA256},
- {EVP_PKEY_EC, NID_sha384, SSL_SIGN_ECDSA_SECP384R1_SHA384},
- {EVP_PKEY_EC, NID_sha512, SSL_SIGN_ECDSA_SECP521R1_SHA512},
- {EVP_PKEY_ED25519, NID_undef, SSL_SIGN_ED25519},
- };
-
- static bool parse_sigalg_pairs(Array<uint16_t> *out, const int *values,
- size_t num_values) {
- if ((num_values & 1) == 1) {
- return false;
- }
-
- const size_t num_pairs = num_values / 2;
- if (!out->Init(num_pairs)) {
- return false;
- }
-
- for (size_t i = 0; i < num_values; i += 2) {
- const int hash_nid = values[i];
- const int pkey_type = values[i+1];
-
- bool found = false;
- for (const auto &candidate : kSignatureAlgorithmsMapping) {
- if (candidate.pkey_type == pkey_type && candidate.hash_nid == hash_nid) {
- (*out)[i / 2] = candidate.signature_algorithm;
- found = true;
- break;
- }
- }
-
- if (!found) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("unknown hash:%d pkey:%d", hash_nid, pkey_type);
- return false;
- }
- }
-
- return true;
- }
-
- static int compare_uint16_t(const void *p1, const void *p2) {
- uint16_t u1 = *((const uint16_t *)p1);
- uint16_t u2 = *((const uint16_t *)p2);
- if (u1 < u2) {
- return -1;
- } else if (u1 > u2) {
- return 1;
- } else {
- return 0;
- }
- }
-
- static bool sigalgs_unique(Span<const uint16_t> in_sigalgs) {
- if (in_sigalgs.size() < 2) {
- return true;
- }
-
- Array<uint16_t> sigalgs;
- if (!sigalgs.CopyFrom(in_sigalgs)) {
- return false;
- }
-
- qsort(sigalgs.data(), sigalgs.size(), sizeof(uint16_t), compare_uint16_t);
-
- for (size_t i = 1; i < sigalgs.size(); i++) {
- if (sigalgs[i - 1] == sigalgs[i]) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DUPLICATE_SIGNATURE_ALGORITHM);
- return false;
- }
- }
-
- return true;
- }
-
- int SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *values, size_t num_values) {
- Array<uint16_t> sigalgs;
- if (!parse_sigalg_pairs(&sigalgs, values, num_values) ||
- !sigalgs_unique(sigalgs)) {
- return 0;
- }
-
- if (!SSL_CTX_set_signing_algorithm_prefs(ctx, sigalgs.data(),
- sigalgs.size()) ||
- !ctx->verify_sigalgs.CopyFrom(sigalgs)) {
- return 0;
- }
-
- return 1;
- }
-
- int SSL_set1_sigalgs(SSL *ssl, const int *values, size_t num_values) {
- if (!ssl->config) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
-
- Array<uint16_t> sigalgs;
- if (!parse_sigalg_pairs(&sigalgs, values, num_values) ||
- !sigalgs_unique(sigalgs)) {
- return 0;
- }
-
- if (!SSL_set_signing_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size()) ||
- !ssl->config->verify_sigalgs.CopyFrom(sigalgs)) {
- return 0;
- }
-
- return 1;
- }
-
- static bool parse_sigalgs_list(Array<uint16_t> *out, const char *str) {
- // str looks like "RSA+SHA1:ECDSA+SHA256:ecdsa_secp256r1_sha256".
-
- // Count colons to give the number of output elements from any successful
- // parse.
- size_t num_elements = 1;
- size_t len = 0;
- for (const char *p = str; *p; p++) {
- len++;
- if (*p == ':') {
- num_elements++;
- }
- }
-
- if (!out->Init(num_elements)) {
- return false;
- }
- size_t out_i = 0;
-
- enum {
- pkey_or_name,
- hash_name,
- } state = pkey_or_name;
-
- char buf[kMaxSignatureAlgorithmNameLen];
- // buf_used is always < sizeof(buf). I.e. it's always safe to write
- // buf[buf_used] = 0.
- size_t buf_used = 0;
-
- int pkey_type = 0, hash_nid = 0;
-
- // Note that the loop runs to len+1, i.e. it'll process the terminating NUL.
- for (size_t offset = 0; offset < len+1; offset++) {
- const char c = str[offset];
-
- switch (c) {
- case '+':
- if (state == hash_name) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("+ found in hash name at offset %zu", offset);
- return false;
- }
- if (buf_used == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("empty public key type at offset %zu", offset);
- return false;
- }
- buf[buf_used] = 0;
-
- if (strcmp(buf, "RSA") == 0) {
- pkey_type = EVP_PKEY_RSA;
- } else if (strcmp(buf, "RSA-PSS") == 0 ||
- strcmp(buf, "PSS") == 0) {
- pkey_type = EVP_PKEY_RSA_PSS;
- } else if (strcmp(buf, "ECDSA") == 0) {
- pkey_type = EVP_PKEY_EC;
- } else {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("unknown public key type '%s'", buf);
- return false;
- }
-
- state = hash_name;
- buf_used = 0;
- break;
-
- case ':':
- OPENSSL_FALLTHROUGH;
- case 0:
- if (buf_used == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("empty element at offset %zu", offset);
- return false;
- }
-
- buf[buf_used] = 0;
-
- if (state == pkey_or_name) {
- // No '+' was seen thus this is a TLS 1.3-style name.
- bool found = false;
- for (const auto &candidate : kSignatureAlgorithmNames) {
- if (strcmp(candidate.name, buf) == 0) {
- assert(out_i < num_elements);
- (*out)[out_i++] = candidate.signature_algorithm;
- found = true;
- break;
- }
- }
-
- if (!found) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("unknown signature algorithm '%s'", buf);
- return false;
- }
- } else {
- if (strcmp(buf, "SHA1") == 0) {
- hash_nid = NID_sha1;
- } else if (strcmp(buf, "SHA256") == 0) {
- hash_nid = NID_sha256;
- } else if (strcmp(buf, "SHA384") == 0) {
- hash_nid = NID_sha384;
- } else if (strcmp(buf, "SHA512") == 0) {
- hash_nid = NID_sha512;
- } else {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("unknown hash function '%s'", buf);
- return false;
- }
-
- bool found = false;
- for (const auto &candidate : kSignatureAlgorithmsMapping) {
- if (candidate.pkey_type == pkey_type &&
- candidate.hash_nid == hash_nid) {
- assert(out_i < num_elements);
- (*out)[out_i++] = candidate.signature_algorithm;
- found = true;
- break;
- }
- }
-
- if (!found) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("unknown pkey:%d hash:%s", pkey_type, buf);
- return false;
- }
- }
-
- state = pkey_or_name;
- buf_used = 0;
- break;
-
- default:
- if (buf_used == sizeof(buf) - 1) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("substring too long at offset %zu", offset);
- return false;
- }
-
- if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
- (c >= 'A' && c <= 'Z') || c == '-' || c == '_') {
- buf[buf_used++] = c;
- } else {
- OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
- ERR_add_error_dataf("invalid character 0x%02x at offest %zu", c,
- offset);
- return false;
- }
- }
- }
-
- assert(out_i == out->size());
- return true;
- }
-
- int SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str) {
- Array<uint16_t> sigalgs;
- if (!parse_sigalgs_list(&sigalgs, str) ||
- !sigalgs_unique(sigalgs)) {
- return 0;
- }
-
- if (!SSL_CTX_set_signing_algorithm_prefs(ctx, sigalgs.data(),
- sigalgs.size()) ||
- !ctx->verify_sigalgs.CopyFrom(sigalgs)) {
- return 0;
- }
-
- return 1;
- }
-
- int SSL_set1_sigalgs_list(SSL *ssl, const char *str) {
- if (!ssl->config) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
-
- Array<uint16_t> sigalgs;
- if (!parse_sigalgs_list(&sigalgs, str) ||
- !sigalgs_unique(sigalgs)) {
- return 0;
- }
-
- if (!SSL_set_signing_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size()) ||
- !ssl->config->verify_sigalgs.CopyFrom(sigalgs)) {
- return 0;
- }
-
- return 1;
- }
-
- int SSL_CTX_set_verify_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
- size_t num_prefs) {
- return ctx->verify_sigalgs.CopyFrom(MakeConstSpan(prefs, num_prefs));
- }
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