/* * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. * Copyright 2005 Nokia. All rights reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "ssl_local.h" #include "record/record_local.h" #include "internal/ktls.h" #include "internal/cryptlib.h" #include #include #include #include #include #include #include /* seed1 through seed5 are concatenated */ static int tls1_PRF(SSL *s, const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, const void *seed5, size_t seed5_len, const unsigned char *sec, size_t slen, unsigned char *out, size_t olen, int fatal) { const EVP_MD *md = ssl_prf_md(s); EVP_KDF *kdf; EVP_KDF_CTX *kctx = NULL; OSSL_PARAM params[8], *p = params; const char *mdname; if (md == NULL) { /* Should never happen */ if (fatal) SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR); else SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR); return 0; } kdf = EVP_KDF_fetch(NULL, OSSL_KDF_NAME_TLS1_PRF, NULL); if (kdf == NULL) goto err; kctx = EVP_KDF_CTX_new(kdf); EVP_KDF_free(kdf); if (kctx == NULL) goto err; mdname = EVP_MD_name(md); *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, (char *)mdname, strlen(mdname) + 1); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET, (unsigned char *)sec, (size_t)slen); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED, (void *)seed1, (size_t)seed1_len); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED, (void *)seed2, (size_t)seed2_len); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED, (void *)seed3, (size_t)seed3_len); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED, (void *)seed4, (size_t)seed4_len); *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED, (void *)seed5, (size_t)seed5_len); *p = OSSL_PARAM_construct_end(); if (EVP_KDF_CTX_set_params(kctx, params) && EVP_KDF_derive(kctx, out, olen)) { EVP_KDF_CTX_free(kctx); return 1; } err: if (fatal) SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR); else SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR); EVP_KDF_CTX_free(kctx); return 0; } static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num) { int ret; /* Calls SSLfatal() as required */ ret = tls1_PRF(s, TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3.server_random, SSL3_RANDOM_SIZE, s->s3.client_random, SSL3_RANDOM_SIZE, NULL, 0, NULL, 0, s->session->master_key, s->session->master_key_length, km, num, 1); return ret; } #ifndef OPENSSL_NO_KTLS /* * Count the number of records that were not processed yet from record boundary. * * This function assumes that there are only fully formed records read in the * record layer. If read_ahead is enabled, then this might be false and this * function will fail. */ static int count_unprocessed_records(SSL *s) { SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer); PACKET pkt, subpkt; int count = 0; if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left)) return -1; while (PACKET_remaining(&pkt) > 0) { /* Skip record type and version */ if (!PACKET_forward(&pkt, 3)) return -1; /* Read until next record */ if (PACKET_get_length_prefixed_2(&pkt, &subpkt)) return -1; count += 1; } return count; } #endif int tls1_change_cipher_state(SSL *s, int which) { unsigned char *p, *mac_secret; unsigned char *ms, *key, *iv; EVP_CIPHER_CTX *dd; const EVP_CIPHER *c; #ifndef OPENSSL_NO_COMP const SSL_COMP *comp; #endif const EVP_MD *m; int mac_type; size_t *mac_secret_size; EVP_MD_CTX *mac_ctx; EVP_PKEY *mac_key; size_t n, i, j, k, cl; int reuse_dd = 0; #ifndef OPENSSL_NO_KTLS struct tls12_crypto_info_aes_gcm_128 crypto_info; BIO *bio; unsigned char geniv[12]; int count_unprocessed; int bit; #endif c = s->s3.tmp.new_sym_enc; m = s->s3.tmp.new_hash; mac_type = s->s3.tmp.new_mac_pkey_type; #ifndef OPENSSL_NO_COMP comp = s->s3.tmp.new_compression; #endif if (which & SSL3_CC_READ) { if (s->ext.use_etm) s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ; else s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ; if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM; else s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM; if (s->enc_read_ctx != NULL) { reuse_dd = 1; } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); goto err; } else { /* * make sure it's initialised in case we exit later with an error */ EVP_CIPHER_CTX_reset(s->enc_read_ctx); } dd = s->enc_read_ctx; mac_ctx = ssl_replace_hash(&s->read_hash, NULL); if (mac_ctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } #ifndef OPENSSL_NO_COMP COMP_CTX_free(s->expand); s->expand = NULL; if (comp != NULL) { s->expand = COMP_CTX_new(comp->method); if (s->expand == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, SSL_R_COMPRESSION_LIBRARY_ERROR); goto err; } } #endif /* * this is done by dtls1_reset_seq_numbers for DTLS */ if (!SSL_IS_DTLS(s)) RECORD_LAYER_reset_read_sequence(&s->rlayer); mac_secret = &(s->s3.read_mac_secret[0]); mac_secret_size = &(s->s3.read_mac_secret_size); } else { s->statem.enc_write_state = ENC_WRITE_STATE_INVALID; if (s->ext.use_etm) s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE; else s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE; if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM; else s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM; if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) { reuse_dd = 1; } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); goto err; } dd = s->enc_write_ctx; if (SSL_IS_DTLS(s)) { mac_ctx = EVP_MD_CTX_new(); if (mac_ctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); goto err; } s->write_hash = mac_ctx; } else { mac_ctx = ssl_replace_hash(&s->write_hash, NULL); if (mac_ctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); goto err; } } #ifndef OPENSSL_NO_COMP COMP_CTX_free(s->compress); s->compress = NULL; if (comp != NULL) { s->compress = COMP_CTX_new(comp->method); if (s->compress == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, SSL_R_COMPRESSION_LIBRARY_ERROR); goto err; } } #endif /* * this is done by dtls1_reset_seq_numbers for DTLS */ if (!SSL_IS_DTLS(s)) RECORD_LAYER_reset_write_sequence(&s->rlayer); mac_secret = &(s->s3.write_mac_secret[0]); mac_secret_size = &(s->s3.write_mac_secret_size); } if (reuse_dd) EVP_CIPHER_CTX_reset(dd); p = s->s3.tmp.key_block; i = *mac_secret_size = s->s3.tmp.new_mac_secret_size; /* TODO(size_t): convert me */ cl = EVP_CIPHER_key_length(c); j = cl; /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ /* If GCM/CCM mode only part of IV comes from PRF */ if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) k = EVP_GCM_TLS_FIXED_IV_LEN; else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) k = EVP_CCM_TLS_FIXED_IV_LEN; else k = EVP_CIPHER_iv_length(c); if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || (which == SSL3_CHANGE_CIPHER_SERVER_READ)) { ms = &(p[0]); n = i + i; key = &(p[n]); n += j + j; iv = &(p[n]); n += k + k; } else { n = i; ms = &(p[n]); n += i + j; key = &(p[n]); n += j + k; iv = &(p[n]); n += k; } if (n > s->s3.tmp.key_block_length) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } memcpy(mac_secret, ms, i); if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) { /* TODO(size_t): Convert this function */ mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret, (int)*mac_secret_size); if (mac_key == NULL || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) { EVP_PKEY_free(mac_key); SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } EVP_PKEY_free(mac_key); } OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "which = %04X, mac key:\n", which); BIO_dump_indent(trc_out, ms, i, 4); } OSSL_TRACE_END(TLS); if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) { if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE)) || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k, iv)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) { int taglen; if (s->s3.tmp. new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8)) taglen = EVP_CCM8_TLS_TAG_LEN; else taglen = EVP_CCM_TLS_TAG_LEN; if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE)) || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL) || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL) || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv) || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } } else { if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } } /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */ if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY, (int)*mac_secret_size, mac_secret)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } #ifndef OPENSSL_NO_KTLS if (s->compress) goto skip_ktls; if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX)) || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX))) goto skip_ktls; /* ktls supports only the maximum fragment size */ if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH) goto skip_ktls; /* check that cipher is AES_GCM_128 */ if (EVP_CIPHER_nid(c) != NID_aes_128_gcm || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE || EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE) goto skip_ktls; /* check version is 1.2 */ if (s->version != TLS1_2_VERSION) goto skip_ktls; if (which & SSL3_CC_WRITE) bio = s->wbio; else bio = s->rbio; if (!ossl_assert(bio != NULL)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */ if (which & SSL3_CC_WRITE) { if (BIO_flush(bio) <= 0) goto skip_ktls; } /* ktls doesn't support renegotiation */ if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) || (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) { SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); goto err; } memset(&crypto_info, 0, sizeof(crypto_info)); crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128; crypto_info.info.version = s->version; EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV, EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN, geniv); memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN, TLS_CIPHER_AES_GCM_128_IV_SIZE); memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE); memcpy(crypto_info.key, key, EVP_CIPHER_key_length(c)); if (which & SSL3_CC_WRITE) memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence, TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); else memcpy(crypto_info.rec_seq, &s->rlayer.read_sequence, TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); if (which & SSL3_CC_READ) { count_unprocessed = count_unprocessed_records(s); if (count_unprocessed < 0) goto skip_ktls; /* increment the crypto_info record sequence */ while (count_unprocessed) { for (bit = 7; bit >= 0; bit--) { /* increment */ ++crypto_info.rec_seq[bit]; if (crypto_info.rec_seq[bit] != 0) break; } count_unprocessed--; } } /* ktls works with user provided buffers directly */ if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) { if (which & SSL3_CC_WRITE) ssl3_release_write_buffer(s); SSL_set_options(s, SSL_OP_NO_RENEGOTIATION); } skip_ktls: #endif /* OPENSSL_NO_KTLS */ s->statem.enc_write_state = ENC_WRITE_STATE_VALID; OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "which = %04X, key:\n", which); BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4); BIO_printf(trc_out, "iv:\n"); BIO_dump_indent(trc_out, iv, k, 4); } OSSL_TRACE_END(TLS); return 1; err: return 0; } int tls1_setup_key_block(SSL *s) { unsigned char *p; const EVP_CIPHER *c; const EVP_MD *hash; SSL_COMP *comp; int mac_type = NID_undef; size_t num, mac_secret_size = 0; int ret = 0; if (s->s3.tmp.key_block_length != 0) return 1; if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size, &comp, s->ext.use_etm)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); return 0; } s->s3.tmp.new_sym_enc = c; s->s3.tmp.new_hash = hash; s->s3.tmp.new_mac_pkey_type = mac_type; s->s3.tmp.new_mac_secret_size = mac_secret_size; num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c); num *= 2; ssl3_cleanup_key_block(s); if ((p = OPENSSL_malloc(num)) == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE); goto err; } s->s3.tmp.key_block_length = num; s->s3.tmp.key_block = p; OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "client random\n"); BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4); BIO_printf(trc_out, "server random\n"); BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4); BIO_printf(trc_out, "master key\n"); BIO_dump_indent(trc_out, s->session->master_key, s->session->master_key_length, 4); } OSSL_TRACE_END(TLS); if (!tls1_generate_key_block(s, p, num)) { /* SSLfatal() already called */ goto err; } OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "key block\n"); BIO_dump_indent(trc_out, p, num, 4); } OSSL_TRACE_END(TLS); if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) && s->method->version <= TLS1_VERSION) { /* * enable vulnerability countermeasure for CBC ciphers with known-IV * problem (http://www.openssl.org/~bodo/tls-cbc.txt) */ s->s3.need_empty_fragments = 1; if (s->session->cipher != NULL) { if (s->session->cipher->algorithm_enc == SSL_eNULL) s->s3.need_empty_fragments = 0; #ifndef OPENSSL_NO_RC4 if (s->session->cipher->algorithm_enc == SSL_RC4) s->s3.need_empty_fragments = 0; #endif } } ret = 1; err: return ret; } size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen, unsigned char *out) { size_t hashlen; unsigned char hash[EVP_MAX_MD_SIZE]; if (!ssl3_digest_cached_records(s, 0)) { /* SSLfatal() already called */ return 0; } if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) { /* SSLfatal() already called */ return 0; } if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0, s->session->master_key, s->session->master_key_length, out, TLS1_FINISH_MAC_LENGTH, 1)) { /* SSLfatal() already called */ return 0; } OPENSSL_cleanse(hash, hashlen); return TLS1_FINISH_MAC_LENGTH; } int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, size_t len, size_t *secret_size) { if (s->session->flags & SSL_SESS_FLAG_EXTMS) { unsigned char hash[EVP_MAX_MD_SIZE * 2]; size_t hashlen; /* * Digest cached records keeping record buffer (if present): this wont * affect client auth because we're freezing the buffer at the same * point (after client key exchange and before certificate verify) */ if (!ssl3_digest_cached_records(s, 1) || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) { /* SSLfatal() already called */ return 0; } OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "Handshake hashes:\n"); BIO_dump(trc_out, (char *)hash, hashlen); } OSSL_TRACE_END(TLS); if (!tls1_PRF(s, TLS_MD_EXTENDED_MASTER_SECRET_CONST, TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, hash, hashlen, NULL, 0, NULL, 0, NULL, 0, p, len, out, SSL3_MASTER_SECRET_SIZE, 1)) { /* SSLfatal() already called */ return 0; } OPENSSL_cleanse(hash, hashlen); } else { if (!tls1_PRF(s, TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, s->s3.client_random, SSL3_RANDOM_SIZE, NULL, 0, s->s3.server_random, SSL3_RANDOM_SIZE, NULL, 0, p, len, out, SSL3_MASTER_SECRET_SIZE, 1)) { /* SSLfatal() already called */ return 0; } } OSSL_TRACE_BEGIN(TLS) { BIO_printf(trc_out, "Premaster Secret:\n"); BIO_dump_indent(trc_out, p, len, 4); BIO_printf(trc_out, "Client Random:\n"); BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4); BIO_printf(trc_out, "Server Random:\n"); BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4); BIO_printf(trc_out, "Master Secret:\n"); BIO_dump_indent(trc_out, s->session->master_key, SSL3_MASTER_SECRET_SIZE, 4); } OSSL_TRACE_END(TLS); *secret_size = SSL3_MASTER_SECRET_SIZE; return 1; } int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, const char *label, size_t llen, const unsigned char *context, size_t contextlen, int use_context) { unsigned char *val = NULL; size_t vallen = 0, currentvalpos; int rv; /* * construct PRF arguments we construct the PRF argument ourself rather * than passing separate values into the TLS PRF to ensure that the * concatenation of values does not create a prohibited label. */ vallen = llen + SSL3_RANDOM_SIZE * 2; if (use_context) { vallen += 2 + contextlen; } val = OPENSSL_malloc(vallen); if (val == NULL) goto err2; currentvalpos = 0; memcpy(val + currentvalpos, (unsigned char *)label, llen); currentvalpos += llen; memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE); currentvalpos += SSL3_RANDOM_SIZE; memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE); currentvalpos += SSL3_RANDOM_SIZE; if (use_context) { val[currentvalpos] = (contextlen >> 8) & 0xff; currentvalpos++; val[currentvalpos] = contextlen & 0xff; currentvalpos++; if ((contextlen > 0) || (context != NULL)) { memcpy(val + currentvalpos, context, contextlen); } } /* * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited * label len) = 15, so size of val > max(prohibited label len) = 15 and * the comparisons won't have buffer overflow */ if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0) goto err1; if (memcmp(val, TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE) == 0) goto err1; if (memcmp(val, TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE) == 0) goto err1; if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST, TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0) goto err1; if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) goto err1; rv = tls1_PRF(s, val, vallen, NULL, 0, NULL, 0, NULL, 0, NULL, 0, s->session->master_key, s->session->master_key_length, out, olen, 0); goto ret; err1: SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); rv = 0; goto ret; err2: SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE); rv = 0; ret: OPENSSL_clear_free(val, vallen); return rv; } int tls1_alert_code(int code) { switch (code) { case SSL_AD_CLOSE_NOTIFY: return SSL3_AD_CLOSE_NOTIFY; case SSL_AD_UNEXPECTED_MESSAGE: return SSL3_AD_UNEXPECTED_MESSAGE; case SSL_AD_BAD_RECORD_MAC: return SSL3_AD_BAD_RECORD_MAC; case SSL_AD_DECRYPTION_FAILED: return TLS1_AD_DECRYPTION_FAILED; case SSL_AD_RECORD_OVERFLOW: return TLS1_AD_RECORD_OVERFLOW; case SSL_AD_DECOMPRESSION_FAILURE: return SSL3_AD_DECOMPRESSION_FAILURE; case SSL_AD_HANDSHAKE_FAILURE: return SSL3_AD_HANDSHAKE_FAILURE; case SSL_AD_NO_CERTIFICATE: return -1; case SSL_AD_BAD_CERTIFICATE: return SSL3_AD_BAD_CERTIFICATE; case SSL_AD_UNSUPPORTED_CERTIFICATE: return SSL3_AD_UNSUPPORTED_CERTIFICATE; case SSL_AD_CERTIFICATE_REVOKED: return SSL3_AD_CERTIFICATE_REVOKED; case SSL_AD_CERTIFICATE_EXPIRED: return SSL3_AD_CERTIFICATE_EXPIRED; case SSL_AD_CERTIFICATE_UNKNOWN: return SSL3_AD_CERTIFICATE_UNKNOWN; case SSL_AD_ILLEGAL_PARAMETER: return SSL3_AD_ILLEGAL_PARAMETER; case SSL_AD_UNKNOWN_CA: return TLS1_AD_UNKNOWN_CA; case SSL_AD_ACCESS_DENIED: return TLS1_AD_ACCESS_DENIED; case SSL_AD_DECODE_ERROR: return TLS1_AD_DECODE_ERROR; case SSL_AD_DECRYPT_ERROR: return TLS1_AD_DECRYPT_ERROR; case SSL_AD_EXPORT_RESTRICTION: return TLS1_AD_EXPORT_RESTRICTION; case SSL_AD_PROTOCOL_VERSION: return TLS1_AD_PROTOCOL_VERSION; case SSL_AD_INSUFFICIENT_SECURITY: return TLS1_AD_INSUFFICIENT_SECURITY; case SSL_AD_INTERNAL_ERROR: return TLS1_AD_INTERNAL_ERROR; case SSL_AD_USER_CANCELLED: return TLS1_AD_USER_CANCELLED; case SSL_AD_NO_RENEGOTIATION: return TLS1_AD_NO_RENEGOTIATION; case SSL_AD_UNSUPPORTED_EXTENSION: return TLS1_AD_UNSUPPORTED_EXTENSION; case SSL_AD_CERTIFICATE_UNOBTAINABLE: return TLS1_AD_CERTIFICATE_UNOBTAINABLE; case SSL_AD_UNRECOGNIZED_NAME: return TLS1_AD_UNRECOGNIZED_NAME; case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE; case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE; case SSL_AD_UNKNOWN_PSK_IDENTITY: return TLS1_AD_UNKNOWN_PSK_IDENTITY; case SSL_AD_INAPPROPRIATE_FALLBACK: return TLS1_AD_INAPPROPRIATE_FALLBACK; case SSL_AD_NO_APPLICATION_PROTOCOL: return TLS1_AD_NO_APPLICATION_PROTOCOL; case SSL_AD_CERTIFICATE_REQUIRED: return SSL_AD_HANDSHAKE_FAILURE; default: return -1; } }