/* 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 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. */ #include #include #include #include #include #include #include #include #include #include #include "internal.h" /* tls1_P_hash computes the TLS P_ function as described in RFC 5246, * section 5. It XORs |out_len| bytes to |out|, using |md| as the hash and * |secret| as the secret. |seed1| through |seed3| are concatenated to form the * seed parameter. It returns one on success and zero on failure. */ static int tls1_P_hash(uint8_t *out, size_t out_len, const EVP_MD *md, const uint8_t *secret, size_t secret_len, const uint8_t *seed1, size_t seed1_len, const uint8_t *seed2, size_t seed2_len, const uint8_t *seed3, size_t seed3_len) { HMAC_CTX ctx, ctx_tmp, ctx_init; uint8_t A1[EVP_MAX_MD_SIZE]; unsigned A1_len; int ret = 0; size_t chunk = EVP_MD_size(md); HMAC_CTX_init(&ctx); HMAC_CTX_init(&ctx_tmp); HMAC_CTX_init(&ctx_init); if (!HMAC_Init_ex(&ctx_init, secret, secret_len, md, NULL) || !HMAC_CTX_copy_ex(&ctx, &ctx_init) || !HMAC_Update(&ctx, seed1, seed1_len) || !HMAC_Update(&ctx, seed2, seed2_len) || !HMAC_Update(&ctx, seed3, seed3_len) || !HMAC_Final(&ctx, A1, &A1_len)) { goto err; } for (;;) { unsigned len; uint8_t hmac[EVP_MAX_MD_SIZE]; if (!HMAC_CTX_copy_ex(&ctx, &ctx_init) || !HMAC_Update(&ctx, A1, A1_len) || /* Save a copy of |ctx| to compute the next A1 value below. */ (out_len > chunk && !HMAC_CTX_copy_ex(&ctx_tmp, &ctx)) || !HMAC_Update(&ctx, seed1, seed1_len) || !HMAC_Update(&ctx, seed2, seed2_len) || !HMAC_Update(&ctx, seed3, seed3_len) || !HMAC_Final(&ctx, hmac, &len)) { goto err; } assert(len == chunk); /* XOR the result into |out|. */ if (len > out_len) { len = out_len; } unsigned i; for (i = 0; i < len; i++) { out[i] ^= hmac[i]; } out += len; out_len -= len; if (out_len == 0) { break; } /* Calculate the next A1 value. */ if (!HMAC_Final(&ctx_tmp, A1, &A1_len)) { goto err; } } ret = 1; err: HMAC_CTX_cleanup(&ctx); HMAC_CTX_cleanup(&ctx_tmp); HMAC_CTX_cleanup(&ctx_init); OPENSSL_cleanse(A1, sizeof(A1)); return ret; } static int tls1_prf(const SSL *ssl, uint8_t *out, size_t out_len, const uint8_t *secret, size_t secret_len, const char *label, size_t label_len, const uint8_t *seed1, size_t seed1_len, const uint8_t *seed2, size_t seed2_len) { if (out_len == 0) { return 1; } memset(out, 0, out_len); uint32_t algorithm_prf = ssl_get_algorithm_prf(ssl); if (algorithm_prf == SSL_HANDSHAKE_MAC_DEFAULT) { /* If using the MD5/SHA1 PRF, |secret| is partitioned between SHA-1 and * MD5, MD5 first. */ size_t secret_half = secret_len - (secret_len / 2); if (!tls1_P_hash(out, out_len, EVP_md5(), secret, secret_half, (const uint8_t *)label, label_len, seed1, seed1_len, seed2, seed2_len)) { return 0; } /* Note that, if |secret_len| is odd, the two halves share a byte. */ secret = secret + (secret_len - secret_half); secret_len = secret_half; } if (!tls1_P_hash(out, out_len, ssl_get_handshake_digest(algorithm_prf), secret, secret_len, (const uint8_t *)label, label_len, seed1, seed1_len, seed2, seed2_len)) { return 0; } return 1; } static int tls1_setup_key_block(SSL *ssl) { if (ssl->s3->hs->key_block_len != 0) { return 1; } SSL_SESSION *session = ssl->session; if (ssl->s3->new_session != NULL) { session = ssl->s3->new_session; } const EVP_AEAD *aead = NULL; size_t mac_secret_len, fixed_iv_len; if (session->cipher == NULL || !ssl_cipher_get_evp_aead(&aead, &mac_secret_len, &fixed_iv_len, session->cipher, ssl3_protocol_version(ssl))) { OPENSSL_PUT_ERROR(SSL, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); return 0; } size_t key_len = EVP_AEAD_key_length(aead); if (mac_secret_len > 0) { /* For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the * key length reported by |EVP_AEAD_key_length| will include the MAC key * bytes and initial implicit IV. */ if (key_len < mac_secret_len + fixed_iv_len) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return 0; } key_len -= mac_secret_len + fixed_iv_len; } assert(mac_secret_len < 256); assert(key_len < 256); assert(fixed_iv_len < 256); ssl->s3->tmp.new_mac_secret_len = (uint8_t)mac_secret_len; ssl->s3->tmp.new_key_len = (uint8_t)key_len; ssl->s3->tmp.new_fixed_iv_len = (uint8_t)fixed_iv_len; size_t key_block_len = SSL_get_key_block_len(ssl); uint8_t *keyblock = OPENSSL_malloc(key_block_len); if (keyblock == NULL) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); return 0; } if (!SSL_generate_key_block(ssl, keyblock, key_block_len)) { OPENSSL_free(keyblock); return 0; } assert(key_block_len < 256); ssl->s3->hs->key_block_len = (uint8_t)key_block_len; ssl->s3->hs->key_block = keyblock; return 1; } int tls1_change_cipher_state(SSL *ssl, int which) { /* Ensure the key block is set up. */ if (!tls1_setup_key_block(ssl)) { return 0; } /* is_read is true if we have just read a ChangeCipherSpec message - i.e. we * need to update the read cipherspec. Otherwise we have just written one. */ const char is_read = (which & SSL3_CC_READ) != 0; /* use_client_keys is true if we wish to use the keys for the "client write" * direction. This is the case if we're a client sending a ChangeCipherSpec, * or a server reading a client's ChangeCipherSpec. */ const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE || which == SSL3_CHANGE_CIPHER_SERVER_READ; size_t mac_secret_len = ssl->s3->tmp.new_mac_secret_len; size_t key_len = ssl->s3->tmp.new_key_len; size_t iv_len = ssl->s3->tmp.new_fixed_iv_len; assert((mac_secret_len + key_len + iv_len) * 2 == ssl->s3->hs->key_block_len); const uint8_t *key_data = ssl->s3->hs->key_block; const uint8_t *client_write_mac_secret = key_data; key_data += mac_secret_len; const uint8_t *server_write_mac_secret = key_data; key_data += mac_secret_len; const uint8_t *client_write_key = key_data; key_data += key_len; const uint8_t *server_write_key = key_data; key_data += key_len; const uint8_t *client_write_iv = key_data; key_data += iv_len; const uint8_t *server_write_iv = key_data; key_data += iv_len; const uint8_t *mac_secret, *key, *iv; if (use_client_keys) { mac_secret = client_write_mac_secret; key = client_write_key; iv = client_write_iv; } else { mac_secret = server_write_mac_secret; key = server_write_key; iv = server_write_iv; } SSL_AEAD_CTX *aead_ctx = SSL_AEAD_CTX_new(is_read ? evp_aead_open : evp_aead_seal, ssl3_protocol_version(ssl), ssl->s3->tmp.new_cipher, key, key_len, mac_secret, mac_secret_len, iv, iv_len); if (aead_ctx == NULL) { return 0; } if (is_read) { return ssl->method->set_read_state(ssl, aead_ctx); } return ssl->method->set_write_state(ssl, aead_ctx); } size_t SSL_get_key_block_len(const SSL *ssl) { return 2 * ((size_t)ssl->s3->tmp.new_mac_secret_len + (size_t)ssl->s3->tmp.new_key_len + (size_t)ssl->s3->tmp.new_fixed_iv_len); } int SSL_generate_key_block(const SSL *ssl, uint8_t *out, size_t out_len) { return ssl->s3->enc_method->prf( ssl, out, out_len, SSL_get_session(ssl)->master_key, SSL_get_session(ssl)->master_key_length, TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, ssl->s3->server_random, SSL3_RANDOM_SIZE, ssl->s3->client_random, SSL3_RANDOM_SIZE); } static int append_digest(const EVP_MD_CTX *ctx, uint8_t *out, size_t *out_len, size_t max_out) { int ret = 0; EVP_MD_CTX ctx_copy; EVP_MD_CTX_init(&ctx_copy); if (EVP_MD_CTX_size(ctx) > max_out) { OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFER_TOO_SMALL); goto err; } unsigned len; if (!EVP_MD_CTX_copy_ex(&ctx_copy, ctx) || !EVP_DigestFinal_ex(&ctx_copy, out, &len)) { goto err; } assert(len == EVP_MD_CTX_size(ctx)); *out_len = len; ret = 1; err: EVP_MD_CTX_cleanup(&ctx_copy); return ret; } /* tls1_handshake_digest calculates the current handshake hash and writes it to * |out|, which has space for |out_len| bytes. It returns the number of bytes * written or -1 in the event of an error. This function works on a copy of the * underlying digests so can be called multiple times and prior to the final * update etc. */ int tls1_handshake_digest(SSL *ssl, uint8_t *out, size_t out_len) { size_t md5_len = 0; if (EVP_MD_CTX_md(&ssl->s3->handshake_md5) != NULL && !append_digest(&ssl->s3->handshake_md5, out, &md5_len, out_len)) { return -1; } size_t len; if (!append_digest(&ssl->s3->handshake_hash, out + md5_len, &len, out_len - md5_len)) { return -1; } return (int)(md5_len + len); } static int tls1_final_finish_mac(SSL *ssl, int from_server, uint8_t *out) { /* At this point, the handshake should have released the handshake buffer on * its own. */ assert(ssl->s3->handshake_buffer == NULL); const char *label = TLS_MD_CLIENT_FINISH_CONST; size_t label_len = TLS_MD_SERVER_FINISH_CONST_SIZE; if (from_server) { label = TLS_MD_SERVER_FINISH_CONST; label_len = TLS_MD_SERVER_FINISH_CONST_SIZE; } uint8_t buf[EVP_MAX_MD_SIZE]; int digests_len = tls1_handshake_digest(ssl, buf, sizeof(buf)); if (digests_len < 0) { return 0; } static const size_t kFinishedLen = 12; if (!ssl->s3->enc_method->prf(ssl, out, kFinishedLen, SSL_get_session(ssl)->master_key, SSL_get_session(ssl)->master_key_length, label, label_len, buf, digests_len, NULL, 0)) { return 0; } return (int)kFinishedLen; } int tls1_generate_master_secret(SSL *ssl, uint8_t *out, const uint8_t *premaster, size_t premaster_len) { if (ssl->s3->tmp.extended_master_secret) { uint8_t digests[EVP_MAX_MD_SIZE]; int digests_len = tls1_handshake_digest(ssl, digests, sizeof(digests)); if (digests_len == -1) { return 0; } if (!ssl->s3->enc_method->prf(ssl, out, SSL3_MASTER_SECRET_SIZE, premaster, premaster_len, TLS_MD_EXTENDED_MASTER_SECRET_CONST, TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests, digests_len, NULL, 0)) { return 0; } } else { if (!ssl->s3->enc_method->prf(ssl, out, SSL3_MASTER_SECRET_SIZE, premaster, premaster_len, TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, ssl->s3->client_random, SSL3_RANDOM_SIZE, ssl->s3->server_random, SSL3_RANDOM_SIZE)) { return 0; } } return SSL3_MASTER_SECRET_SIZE; } int SSL_export_keying_material(SSL *ssl, uint8_t *out, size_t out_len, const char *label, size_t label_len, const uint8_t *context, size_t context_len, int use_context) { if (!ssl->s3->have_version || ssl->version == SSL3_VERSION) { return 0; } /* Exporters may not be used in the middle of a renegotiation. */ if (SSL_in_init(ssl) && !SSL_in_false_start(ssl)) { return 0; } if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) { return tls13_export_keying_material(ssl, out, out_len, label, label_len, context, context_len, use_context); } size_t seed_len = 2 * SSL3_RANDOM_SIZE; if (use_context) { if (context_len >= 1u << 16) { OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); return 0; } seed_len += 2 + context_len; } uint8_t *seed = OPENSSL_malloc(seed_len); if (seed == NULL) { OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); return 0; } memcpy(seed, ssl->s3->client_random, SSL3_RANDOM_SIZE); memcpy(seed + SSL3_RANDOM_SIZE, ssl->s3->server_random, SSL3_RANDOM_SIZE); if (use_context) { seed[2 * SSL3_RANDOM_SIZE] = (uint8_t)(context_len >> 8); seed[2 * SSL3_RANDOM_SIZE + 1] = (uint8_t)context_len; memcpy(seed + 2 * SSL3_RANDOM_SIZE + 2, context, context_len); } int ret = ssl->s3->enc_method->prf(ssl, out, out_len, SSL_get_session(ssl)->master_key, SSL_get_session(ssl)->master_key_length, label, label_len, seed, seed_len, NULL, 0); OPENSSL_free(seed); return ret; } const SSL3_ENC_METHOD TLSv1_enc_data = { tls1_prf, tls1_final_finish_mac, };