|
- /* 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 <limits.h>
-
- #include <openssl/ec.h>
- #include <openssl/ec_key.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
- #include <openssl/type_check.h>
- #include <openssl/x509.h>
- #include <openssl/x509v3.h>
-
- #include "internal.h"
-
-
- static int ssl_set_cert(CERT *c, X509 *x509);
- static int ssl_set_pkey(CERT *c, EVP_PKEY *pkey);
-
- static int is_key_type_supported(int key_type) {
- return key_type == EVP_PKEY_RSA || key_type == EVP_PKEY_EC;
- }
-
- int SSL_use_certificate(SSL *ssl, X509 *x) {
- if (x == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- return ssl_set_cert(ssl->cert, x);
- }
-
- int SSL_use_certificate_ASN1(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;
- X509 *x509 = d2i_X509(NULL, &p, (long)der_len);
- if (x509 == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- X509_free(x509);
- return 0;
- }
-
- int ret = SSL_use_certificate(ssl, x509);
- X509_free(x509);
- return ret;
- }
-
- int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa) {
- EVP_PKEY *pkey;
- int ret;
-
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- pkey = EVP_PKEY_new();
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- RSA_up_ref(rsa);
- EVP_PKEY_assign_RSA(pkey, rsa);
-
- ret = ssl_set_pkey(ssl->cert, pkey);
- EVP_PKEY_free(pkey);
-
- return ret;
- }
-
- static int ssl_set_pkey(CERT *c, EVP_PKEY *pkey) {
- if (!is_key_type_supported(pkey->type)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- return 0;
- }
-
- X509 *x509_leaf = c->x509_leaf;
- if (x509_leaf != NULL) {
- /* Sanity-check that the private key and the certificate match, unless the
- * key is opaque (in case of, say, a smartcard). */
- if (!EVP_PKEY_is_opaque(pkey) &&
- !X509_check_private_key(x509_leaf, pkey)) {
- X509_free(c->x509_leaf);
- c->x509_leaf = NULL;
- return 0;
- }
- }
-
- EVP_PKEY_free(c->privatekey);
- EVP_PKEY_up_ref(pkey);
- c->privatekey = pkey;
-
- return 1;
- }
-
- int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) {
- RSA *rsa = RSA_private_key_from_bytes(der, der_len);
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- int ret = SSL_use_RSAPrivateKey(ssl, rsa);
- RSA_free(rsa);
- return ret;
- }
-
- int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey) {
- int ret;
-
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- ret = ssl_set_pkey(ssl->cert, pkey);
- return ret;
- }
-
- 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;
- EVP_PKEY *pkey = d2i_PrivateKey(type, NULL, &p, (long)der_len);
- if (pkey == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- EVP_PKEY_free(pkey);
- return 0;
- }
-
- int ret = SSL_use_PrivateKey(ssl, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x) {
- if (x == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- return ssl_set_cert(ctx->cert, x);
- }
-
- static int ssl_set_cert(CERT *c, X509 *x) {
- EVP_PKEY *pkey = X509_get_pubkey(x);
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_X509_LIB);
- return 0;
- }
-
- if (!is_key_type_supported(pkey->type)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- EVP_PKEY_free(pkey);
- return 0;
- }
-
- /* An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA
- * certificates, so sanity-check the key usage extension. */
- if (pkey->type == EVP_PKEY_EC) {
- /* This call populates extension flags (ex_flags). */
- X509_check_purpose(x, -1, 0);
- if ((x->ex_flags & EXFLAG_KUSAGE) &&
- !(x->ex_kusage & X509v3_KU_DIGITAL_SIGNATURE)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- EVP_PKEY_free(pkey);
- return 0;
- }
- }
-
- if (c->privatekey != NULL) {
- /* Sanity-check that the private key and the certificate match, unless the
- * key is opaque (in case of, say, a smartcard). */
- if (!EVP_PKEY_is_opaque(c->privatekey) &&
- !X509_check_private_key(x, c->privatekey)) {
- /* don't fail for a cert/key mismatch, just free current private key
- * (when switching to a different cert & key, first this function should
- * be used, then ssl_set_pkey */
- EVP_PKEY_free(c->privatekey);
- c->privatekey = NULL;
- /* clear error queue */
- ERR_clear_error();
- }
- }
-
- EVP_PKEY_free(pkey);
-
- X509_free(c->x509_leaf);
- X509_up_ref(x);
- c->x509_leaf = x;
-
- return 1;
- }
-
- int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len,
- const uint8_t *der) {
- if (der_len > LONG_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- const uint8_t *p = der;
- X509 *x509 = d2i_X509(NULL, &p, (long)der_len);
- if (x509 == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- X509_free(x509);
- return 0;
- }
-
- int ret = SSL_CTX_use_certificate(ctx, x509);
- X509_free(x509);
- return ret;
- }
-
- int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa) {
- int ret;
- EVP_PKEY *pkey;
-
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- pkey = EVP_PKEY_new();
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- RSA_up_ref(rsa);
- EVP_PKEY_assign_RSA(pkey, rsa);
-
- ret = ssl_set_pkey(ctx->cert, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const uint8_t *der,
- size_t der_len) {
- RSA *rsa = RSA_private_key_from_bytes(der, der_len);
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- int ret = SSL_CTX_use_RSAPrivateKey(ctx, rsa);
- RSA_free(rsa);
- return ret;
- }
-
- 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, 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;
- EVP_PKEY *pkey = d2i_PrivateKey(type, NULL, &p, (long)der_len);
- if (pkey == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- EVP_PKEY_free(pkey);
- return 0;
- }
-
- int ret = SSL_CTX_use_PrivateKey(ctx, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- void SSL_set_private_key_method(SSL *ssl,
- const SSL_PRIVATE_KEY_METHOD *key_method) {
- ssl->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 int set_signing_algorithm_prefs(CERT *cert, const uint16_t *prefs,
- size_t num_prefs) {
- OPENSSL_free(cert->sigalgs);
-
- cert->num_sigalgs = 0;
- cert->sigalgs = BUF_memdup(prefs, num_prefs * sizeof(prefs[0]));
- if (cert->sigalgs == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- cert->num_sigalgs = num_prefs;
-
- return 1;
- }
-
- int SSL_CTX_set_signing_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
- size_t num_prefs) {
- return set_signing_algorithm_prefs(ctx->cert, prefs, num_prefs);
- }
-
-
- int SSL_set_signing_algorithm_prefs(SSL *ssl, const uint16_t *prefs,
- size_t num_prefs) {
- return set_signing_algorithm_prefs(ssl->cert, prefs, num_prefs);
- }
-
- OPENSSL_COMPILE_ASSERT(sizeof(int) >= 2 * sizeof(uint16_t),
- digest_list_conversion_cannot_overflow);
-
- int SSL_set_private_key_digest_prefs(SSL *ssl, const int *digest_nids,
- size_t num_digests) {
- OPENSSL_free(ssl->cert->sigalgs);
-
- ssl->cert->num_sigalgs = 0;
- ssl->cert->sigalgs = OPENSSL_malloc(sizeof(uint16_t) * 2 * num_digests);
- if (ssl->cert->sigalgs == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
-
- /* Convert the digest list to a signature algorithms list.
- *
- * TODO(davidben): Replace this API with one that can express RSA-PSS, etc. */
- for (size_t i = 0; i < num_digests; i++) {
- switch (digest_nids[i]) {
- case NID_sha1:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA1;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] = SSL_SIGN_ECDSA_SHA1;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha256:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA256;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP256R1_SHA256;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha384:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA384;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP384R1_SHA384;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha512:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA512;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP521R1_SHA512;
- ssl->cert->num_sigalgs += 2;
- break;
- }
- }
-
- return 1;
- }
-
- int ssl_has_private_key(const SSL *ssl) {
- return ssl->cert->privatekey != NULL || ssl->cert->key_method != NULL;
- }
-
- int ssl_is_ecdsa_key_type(int type) {
- switch (type) {
- /* TODO(davidben): Remove support for |EVP_PKEY_EC| key types. */
- case EVP_PKEY_EC:
- case NID_X9_62_prime256v1:
- case NID_secp384r1:
- case NID_secp521r1:
- return 1;
- default:
- return 0;
- }
- }
-
- int ssl_private_key_type(SSL *ssl) {
- if (ssl->cert->key_method != NULL) {
- return ssl->cert->key_method->type(ssl);
- }
- switch (EVP_PKEY_id(ssl->cert->privatekey)) {
- case EVP_PKEY_RSA:
- return NID_rsaEncryption;
- case EVP_PKEY_EC:
- return EC_GROUP_get_curve_name(
- EC_KEY_get0_group(EVP_PKEY_get0_EC_KEY(ssl->cert->privatekey)));
- default:
- return NID_undef;
- }
- }
-
- size_t ssl_private_key_max_signature_len(SSL *ssl) {
- if (ssl->cert->key_method != NULL) {
- return ssl->cert->key_method->max_signature_len(ssl);
- }
- return EVP_PKEY_size(ssl->cert->privatekey);
- }
-
- /* TODO(davidben): Forbid RSA-PKCS1 in TLS 1.3. For now we allow it because NSS
- * has yet to start doing RSA-PSS, so enforcing it would complicate interop
- * testing. */
- static int is_rsa_pkcs1(const EVP_MD **out_md, uint16_t sigalg) {
- switch (sigalg) {
- case SSL_SIGN_RSA_PKCS1_MD5_SHA1:
- *out_md = EVP_md5_sha1();
- return 1;
- case SSL_SIGN_RSA_PKCS1_SHA1:
- *out_md = EVP_sha1();
- return 1;
- case SSL_SIGN_RSA_PKCS1_SHA256:
- *out_md = EVP_sha256();
- return 1;
- case SSL_SIGN_RSA_PKCS1_SHA384:
- *out_md = EVP_sha384();
- return 1;
- case SSL_SIGN_RSA_PKCS1_SHA512:
- *out_md = EVP_sha512();
- return 1;
- default:
- return 0;
- }
- }
-
- static int ssl_sign_rsa_pkcs1(SSL *ssl, uint8_t *out, size_t *out_len,
- size_t max_out, const EVP_MD *md,
- const uint8_t *in, size_t in_len) {
- EVP_MD_CTX ctx;
- EVP_MD_CTX_init(&ctx);
- *out_len = max_out;
- int ret = EVP_DigestSignInit(&ctx, NULL, md, NULL, ssl->cert->privatekey) &&
- EVP_DigestSignUpdate(&ctx, in, in_len) &&
- EVP_DigestSignFinal(&ctx, out, out_len);
- EVP_MD_CTX_cleanup(&ctx);
- return ret;
- }
-
- static int ssl_verify_rsa_pkcs1(SSL *ssl, const uint8_t *signature,
- size_t signature_len, const EVP_MD *md,
- EVP_PKEY *pkey, const uint8_t *in,
- size_t in_len) {
- if (pkey->type != EVP_PKEY_RSA) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- EVP_MD_CTX md_ctx;
- EVP_MD_CTX_init(&md_ctx);
- int ret = EVP_DigestVerifyInit(&md_ctx, NULL, md, NULL, pkey) &&
- EVP_DigestVerifyUpdate(&md_ctx, in, in_len) &&
- EVP_DigestVerifyFinal(&md_ctx, signature, signature_len);
- EVP_MD_CTX_cleanup(&md_ctx);
- return ret;
- }
-
- static int is_ecdsa(int *out_curve, const EVP_MD **out_md, uint16_t sigalg) {
- switch (sigalg) {
- case SSL_SIGN_ECDSA_SHA1:
- *out_curve = NID_undef;
- *out_md = EVP_sha1();
- return 1;
- case SSL_SIGN_ECDSA_SECP256R1_SHA256:
- *out_curve = NID_X9_62_prime256v1;
- *out_md = EVP_sha256();
- return 1;
- case SSL_SIGN_ECDSA_SECP384R1_SHA384:
- *out_curve = NID_secp384r1;
- *out_md = EVP_sha384();
- return 1;
- case SSL_SIGN_ECDSA_SECP521R1_SHA512:
- *out_curve = NID_secp521r1;
- *out_md = EVP_sha512();
- return 1;
- default:
- return 0;
- }
- }
-
- static int ssl_sign_ecdsa(SSL *ssl, uint8_t *out, size_t *out_len,
- size_t max_out, int curve, const EVP_MD *md,
- const uint8_t *in, size_t in_len) {
- EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(ssl->cert->privatekey);
- if (ec_key == NULL) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- /* In TLS 1.3, the curve is also specified by the signature algorithm. */
- if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION &&
- (curve == NID_undef ||
- EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key)) != curve)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- EVP_MD_CTX ctx;
- EVP_MD_CTX_init(&ctx);
- *out_len = max_out;
- int ret = EVP_DigestSignInit(&ctx, NULL, md, NULL, ssl->cert->privatekey) &&
- EVP_DigestSignUpdate(&ctx, in, in_len) &&
- EVP_DigestSignFinal(&ctx, out, out_len);
- EVP_MD_CTX_cleanup(&ctx);
- return ret;
- }
-
- static int ssl_verify_ecdsa(SSL *ssl, const uint8_t *signature,
- size_t signature_len, int curve, const EVP_MD *md,
- EVP_PKEY *pkey, const uint8_t *in, size_t in_len) {
- EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey);
- if (ec_key == NULL) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- /* In TLS 1.3, the curve is also specified by the signature algorithm. */
- if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION &&
- (curve == NID_undef ||
- EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key)) != curve)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- EVP_MD_CTX md_ctx;
- EVP_MD_CTX_init(&md_ctx);
- int ret = EVP_DigestVerifyInit(&md_ctx, NULL, md, NULL, pkey) &&
- EVP_DigestVerifyUpdate(&md_ctx, in, in_len) &&
- EVP_DigestVerifyFinal(&md_ctx, signature, signature_len);
- EVP_MD_CTX_cleanup(&md_ctx);
- return ret;
- }
-
- static int is_rsa_pss(const EVP_MD **out_md, uint16_t sigalg) {
- switch (sigalg) {
- case SSL_SIGN_RSA_PSS_SHA256:
- *out_md = EVP_sha256();
- return 1;
- case SSL_SIGN_RSA_PSS_SHA384:
- *out_md = EVP_sha384();
- return 1;
- case SSL_SIGN_RSA_PSS_SHA512:
- *out_md = EVP_sha512();
- return 1;
- default:
- return 0;
- }
- }
-
- static int ssl_sign_rsa_pss(SSL *ssl, uint8_t *out, size_t *out_len,
- size_t max_out, const EVP_MD *md,
- const uint8_t *in, size_t in_len) {
- EVP_MD_CTX ctx;
- EVP_MD_CTX_init(&ctx);
- *out_len = max_out;
- EVP_PKEY_CTX *pctx;
- int ret =
- EVP_DigestSignInit(&ctx, &pctx, md, NULL, ssl->cert->privatekey) &&
- EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) &&
- EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1 /* salt len = hash len */) &&
- EVP_DigestSignUpdate(&ctx, in, in_len) &&
- EVP_DigestSignFinal(&ctx, out, out_len);
- EVP_MD_CTX_cleanup(&ctx);
- return ret;
- }
-
- static int ssl_verify_rsa_pss(SSL *ssl, const uint8_t *signature,
- size_t signature_len, const EVP_MD *md,
- EVP_PKEY *pkey, const uint8_t *in,
- size_t in_len) {
- if (pkey->type != EVP_PKEY_RSA) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- EVP_MD_CTX md_ctx;
- EVP_MD_CTX_init(&md_ctx);
- EVP_PKEY_CTX *pctx;
- int ret =
- EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey) &&
- EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) &&
- EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1 /* salt len = hash len */) &&
- EVP_DigestVerifyUpdate(&md_ctx, in, in_len) &&
- EVP_DigestVerifyFinal(&md_ctx, signature, signature_len);
- EVP_MD_CTX_cleanup(&md_ctx);
- return ret;
- }
-
- enum ssl_private_key_result_t ssl_private_key_sign(
- SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
- uint16_t signature_algorithm, const uint8_t *in, size_t in_len) {
- if (ssl->cert->key_method != NULL) {
- if (ssl->cert->key_method->sign != NULL) {
- return ssl->cert->key_method->sign(ssl, out, out_len, max_out,
- signature_algorithm, in, in_len);
- }
-
- /* TODO(davidben): Remove support for |sign_digest|-only
- * |SSL_PRIVATE_KEY_METHOD|s. */
- const EVP_MD *md;
- int curve;
- if (!is_rsa_pkcs1(&md, signature_algorithm) &&
- !is_ecdsa(&curve, &md, signature_algorithm)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_PROTOCOL_FOR_CUSTOM_KEY);
- return ssl_private_key_failure;
- }
-
- uint8_t hash[EVP_MAX_MD_SIZE];
- unsigned hash_len;
- if (!EVP_Digest(in, in_len, hash, &hash_len, md, NULL)) {
- return ssl_private_key_failure;
- }
-
- return ssl->cert->key_method->sign_digest(ssl, out, out_len, max_out, md,
- hash, hash_len);
- }
-
- const EVP_MD *md;
- if (is_rsa_pkcs1(&md, signature_algorithm) &&
- ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- return ssl_sign_rsa_pkcs1(ssl, out, out_len, max_out, md, in, in_len)
- ? ssl_private_key_success
- : ssl_private_key_failure;
- }
-
- int curve;
- if (is_ecdsa(&curve, &md, signature_algorithm)) {
- return ssl_sign_ecdsa(ssl, out, out_len, max_out, curve, md, in, in_len)
- ? ssl_private_key_success
- : ssl_private_key_failure;
- }
-
- if (is_rsa_pss(&md, signature_algorithm)) {
- return ssl_sign_rsa_pss(ssl, out, out_len, max_out, md, in, in_len)
- ? ssl_private_key_success
- : ssl_private_key_failure;
- }
-
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return ssl_private_key_failure;
- }
-
- int ssl_public_key_verify(SSL *ssl, const uint8_t *signature,
- size_t signature_len, uint16_t signature_algorithm,
- EVP_PKEY *pkey, const uint8_t *in, size_t in_len) {
- const EVP_MD *md;
- if (is_rsa_pkcs1(&md, signature_algorithm) &&
- ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- return ssl_verify_rsa_pkcs1(ssl, signature, signature_len, md, pkey, in,
- in_len);
- }
-
- int curve;
- if (is_ecdsa(&curve, &md, signature_algorithm)) {
- return ssl_verify_ecdsa(ssl, signature, signature_len, curve, md, pkey, in,
- in_len);
- }
-
- if (is_rsa_pss(&md, signature_algorithm)) {
- return ssl_verify_rsa_pss(ssl, signature, signature_len, md, pkey, in,
- in_len);
- }
-
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- enum ssl_private_key_result_t ssl_private_key_decrypt(
- SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out,
- const uint8_t *in, size_t in_len) {
- if (ssl->cert->key_method != NULL) {
- return ssl->cert->key_method->decrypt(ssl, out, out_len, max_out, in,
- in_len);
- }
-
- RSA *rsa = EVP_PKEY_get0_RSA(ssl->cert->privatekey);
- 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, in_len, RSA_NO_PADDING)) {
- return ssl_private_key_failure;
- }
- return ssl_private_key_success;
- }
-
- enum ssl_private_key_result_t ssl_private_key_complete(SSL *ssl, uint8_t *out,
- size_t *out_len,
- size_t max_out) {
- /* Only custom keys may be asynchronous. */
- return ssl->cert->key_method->complete(ssl, out, out_len, max_out);
- }
-
- int ssl_private_key_supports_signature_algorithm(SSL *ssl,
- uint16_t signature_algorithm) {
- const EVP_MD *md;
- if (is_rsa_pkcs1(&md, signature_algorithm) &&
- ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- return ssl_private_key_type(ssl) == NID_rsaEncryption;
- }
-
- int curve;
- if (is_ecdsa(&curve, &md, signature_algorithm)) {
- int type = ssl_private_key_type(ssl);
- if (!ssl_is_ecdsa_key_type(type)) {
- return 0;
- }
-
- /* Prior to TLS 1.3, ECDSA curves did not match the signature algorithm. */
- if (ssl3_protocol_version(ssl) < TLS1_3_VERSION) {
- return 1;
- }
-
- return curve != NID_undef && type == curve;
- }
-
- if (is_rsa_pss(&md, signature_algorithm)) {
- if (ssl_private_key_type(ssl) != NID_rsaEncryption) {
- return 0;
- }
-
- /* 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 large for
- * SHA-512. 1024-bit RSA is sometimes used for test credentials, so check
- * the size to fall back to another algorithm. */
- if (ssl_private_key_max_signature_len(ssl) < 2 * EVP_MD_size(md) + 2) {
- return 0;
- }
-
- /* RSA-PSS is only supported by message-based private keys. */
- if (ssl->cert->key_method != NULL && ssl->cert->key_method->sign == NULL) {
- return 0;
- }
-
- return 1;
- }
-
- return 0;
- }
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