/* * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved * * Licensed under the OpenSSL license (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 #include #include "../ssl_local.h" #include "statem_local.h" #include "internal/cryptlib.h" #include #include #include #include /* * Map error codes to TLS/SSL alart types. */ typedef struct x509err2alert_st { int x509err; int alert; } X509ERR2ALERT; /* Fixed value used in the ServerHello random field to identify an HRR */ const unsigned char hrrrandom[] = { 0xcf, 0x21, 0xad, 0x74, 0xe5, 0x9a, 0x61, 0x11, 0xbe, 0x1d, 0x8c, 0x02, 0x1e, 0x65, 0xb8, 0x91, 0xc2, 0xa2, 0x11, 0x16, 0x7a, 0xbb, 0x8c, 0x5e, 0x07, 0x9e, 0x09, 0xe2, 0xc8, 0xa8, 0x33, 0x9c }; /* * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or * SSL3_RT_CHANGE_CIPHER_SPEC) */ int ssl3_do_write(SSL *s, int type) { int ret; size_t written = 0; #ifndef OPENSSL_NO_QUIC if (SSL_IS_QUIC(s)) { if (type == SSL3_RT_HANDSHAKE) { ret = s->quic_method->add_handshake_data(s, s->quic_write_level, (const uint8_t*)&s->init_buf->data[s->init_off], s->init_num); if (!ret) { ret = -1; /* QUIC can't sent anything out sice the above failed */ SSLerr(SSL_F_SSL3_DO_WRITE, ERR_R_INTERNAL_ERROR); } else { written = s->init_num; } } else { /* QUIC doesn't use ChangeCipherSpec */ ret = -1; SSLerr(SSL_F_SSL3_DO_WRITE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); } } else #endif ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off], s->init_num, &written); if (ret < 0) return -1; if (type == SSL3_RT_HANDSHAKE) /* * should not be done for 'Hello Request's, but in that case we'll * ignore the result anyway * TLS1.3 KeyUpdate and NewSessionTicket do not need to be added */ if (!SSL_IS_TLS13(s) || (s->statem.hand_state != TLS_ST_SW_SESSION_TICKET && s->statem.hand_state != TLS_ST_CW_KEY_UPDATE && s->statem.hand_state != TLS_ST_SW_KEY_UPDATE)) if (!ssl3_finish_mac(s, (unsigned char *)&s->init_buf->data[s->init_off], written)) return -1; if (written == s->init_num) { if (s->msg_callback) s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); return 1; } s->init_off += written; s->init_num -= written; return 0; } int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype) { size_t msglen; if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt)) || !WPACKET_get_length(pkt, &msglen) || msglen > INT_MAX) return 0; s->init_num = (int)msglen; s->init_off = 0; return 1; } int tls_setup_handshake(SSL *s) { if (!ssl3_init_finished_mac(s)) { /* SSLfatal() already called */ return 0; } /* Reset any extension flags */ memset(s->ext.extflags, 0, sizeof(s->ext.extflags)); if (s->server) { STACK_OF(SSL_CIPHER) *ciphers = SSL_get_ciphers(s); int i, ver_min, ver_max, ok = 0; /* * Sanity check that the maximum version we accept has ciphers * enabled. For clients we do this check during construction of the * ClientHello. */ if (ssl_get_min_max_version(s, &ver_min, &ver_max, NULL) != 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_SETUP_HANDSHAKE, ERR_R_INTERNAL_ERROR); return 0; } for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i); if (SSL_IS_DTLS(s)) { if (DTLS_VERSION_GE(ver_max, c->min_dtls) && DTLS_VERSION_LE(ver_max, c->max_dtls)) ok = 1; } else if (ver_max >= c->min_tls && ver_max <= c->max_tls) { ok = 1; } if (ok) break; } if (!ok) { SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_SETUP_HANDSHAKE, SSL_R_NO_CIPHERS_AVAILABLE); ERR_add_error_data(1, "No ciphers enabled for max supported " "SSL/TLS version"); return 0; } if (SSL_IS_FIRST_HANDSHAKE(s)) { /* N.B. s->session_ctx == s->ctx here */ tsan_counter(&s->session_ctx->stats.sess_accept); } else { /* N.B. s->ctx may not equal s->session_ctx */ tsan_counter(&s->ctx->stats.sess_accept_renegotiate); s->s3->tmp.cert_request = 0; } } else { if (SSL_IS_FIRST_HANDSHAKE(s)) tsan_counter(&s->session_ctx->stats.sess_connect); else tsan_counter(&s->session_ctx->stats.sess_connect_renegotiate); /* mark client_random uninitialized */ memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); s->hit = 0; s->s3->tmp.cert_req = 0; if (SSL_IS_DTLS(s)) s->statem.use_timer = 1; } return 1; } /* * Size of the to-be-signed TLS13 data, without the hash size itself: * 64 bytes of value 32, 33 context bytes, 1 byte separator */ #define TLS13_TBS_START_SIZE 64 #define TLS13_TBS_PREAMBLE_SIZE (TLS13_TBS_START_SIZE + 33 + 1) static int get_cert_verify_tbs_data(SSL *s, unsigned char *tls13tbs, void **hdata, size_t *hdatalen) { #ifdef CHARSET_EBCDIC static const char servercontext[] = { 0x54, 0x4c, 0x53, 0x20, 0x31, 0x2e, 0x33, 0x2c, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x43, 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x56, 0x65, 0x72, 0x69, 0x66, 0x79, 0x00 }; static const char clientcontext[] = { 0x54, 0x4c, 0x53, 0x20, 0x31, 0x2e, 0x33, 0x2c, 0x20, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x20, 0x43, 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x56, 0x65, 0x72, 0x69, 0x66, 0x79, 0x00 }; #else static const char servercontext[] = "TLS 1.3, server CertificateVerify"; static const char clientcontext[] = "TLS 1.3, client CertificateVerify"; #endif if (SSL_IS_TLS13(s)) { size_t hashlen; /* Set the first 64 bytes of to-be-signed data to octet 32 */ memset(tls13tbs, 32, TLS13_TBS_START_SIZE); /* This copies the 33 bytes of context plus the 0 separator byte */ if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY || s->statem.hand_state == TLS_ST_SW_CERT_VRFY) strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, servercontext); else strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, clientcontext); /* * If we're currently reading then we need to use the saved handshake * hash value. We can't use the current handshake hash state because * that includes the CertVerify itself. */ if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY || s->statem.hand_state == TLS_ST_SR_CERT_VRFY) { memcpy(tls13tbs + TLS13_TBS_PREAMBLE_SIZE, s->cert_verify_hash, s->cert_verify_hash_len); hashlen = s->cert_verify_hash_len; } else if (!ssl_handshake_hash(s, tls13tbs + TLS13_TBS_PREAMBLE_SIZE, EVP_MAX_MD_SIZE, &hashlen)) { /* SSLfatal() already called */ return 0; } *hdata = tls13tbs; *hdatalen = TLS13_TBS_PREAMBLE_SIZE + hashlen; } else { size_t retlen; long retlen_l; retlen = retlen_l = BIO_get_mem_data(s->s3->handshake_buffer, hdata); if (retlen_l <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_GET_CERT_VERIFY_TBS_DATA, ERR_R_INTERNAL_ERROR); return 0; } *hdatalen = retlen; } return 1; } int tls_construct_cert_verify(SSL *s, WPACKET *pkt) { EVP_PKEY *pkey = NULL; const EVP_MD *md = NULL; EVP_MD_CTX *mctx = NULL; EVP_PKEY_CTX *pctx = NULL; size_t hdatalen = 0, siglen = 0; void *hdata; unsigned char *sig = NULL; unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE]; const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg; if (lu == NULL || s->s3->tmp.cert == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } #ifndef OPENSSL_NO_DELEGATED_CREDENTIAL if (s->delegated_credential_tag & DC_HAS_BEEN_USED_FOR_SIGN) pkey = s->s3->tmp.cert->dc_privatekey; else #endif pkey = s->s3->tmp.cert->privatekey; if (pkey == NULL || !tls1_lookup_md(lu, &md)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } mctx = EVP_MD_CTX_new(); if (mctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } #ifndef OPENSSL_NO_SM2 if (EVP_PKEY_is_sm2(pkey)) { if (pkey != NULL) { pctx = EVP_PKEY_CTX_new(pkey, NULL); if (EVP_PKEY_CTX_set1_id(pctx, HANDSHAKE_SM2_ID, HANDSHAKE_SM2_ID_LEN) != 1) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } EVP_MD_CTX_set_pkey_ctx(mctx, pctx); } } #endif /* Get the data to be signed */ if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) { /* SSLfatal() already called */ goto err; } if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } siglen = EVP_PKEY_size(pkey); sig = OPENSSL_malloc(siglen); if (sig == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } { if (EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } if (lu->sig == EVP_PKEY_RSA_PSS) { if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } } } if (s->version == SSL3_VERSION) { if (EVP_DigestSignUpdate(mctx, hdata, hdatalen) <= 0 || !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, (int)s->session->master_key_length, s->session->master_key) || EVP_DigestSignFinal(mctx, sig, &siglen) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } } else { if (EVP_DigestSign(mctx, sig, &siglen, hdata, hdatalen) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } } #ifndef OPENSSL_NO_GOST { int pktype = lu->sig; if (pktype == NID_id_GostR3410_2001 || pktype == NID_id_GostR3410_2012_256 || pktype == NID_id_GostR3410_2012_512) BUF_reverse(sig, NULL, siglen); } #endif if (!WPACKET_sub_memcpy_u16(pkt, sig, siglen)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } /* Digest cached records and discard handshake buffer */ if (!ssl3_digest_cached_records(s, 0)) { /* SSLfatal() already called */ goto err; } OPENSSL_free(sig); EVP_MD_CTX_free(mctx); #ifndef OPENSSL_NO_SM2 if (pkey != NULL && EVP_PKEY_is_sm2(pkey)) { /*other sig call EVP_PKEY_CTX_free there may cause segfault */ EVP_PKEY_CTX_free(pctx); } #endif return 1; err: OPENSSL_free(sig); EVP_MD_CTX_free(mctx); #ifndef OPENSSL_NO_SM2 if (pkey != NULL && EVP_PKEY_is_sm2(pkey)) EVP_PKEY_CTX_free(pctx); #endif return 0; } MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) { EVP_PKEY *pkey = NULL; const unsigned char *data; #ifndef OPENSSL_NO_GOST unsigned char *gost_data = NULL; #endif MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR; int j; unsigned int len; X509 *peer; const EVP_MD *md = NULL; size_t hdatalen = 0; void *hdata; unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE]; EVP_MD_CTX *mctx = EVP_MD_CTX_new(); EVP_PKEY_CTX *pctx = NULL; if (mctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } peer = s->session->peer; pkey = X509_get0_pubkey(peer); #ifndef OPENSSL_NO_DELEGATED_CREDENTIAL if (s->delegated_credential_tag & DC_HAS_BEEN_USED_FOR_VERIFY_PEER) { if (s->session->peer_dc == NULL) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } pkey = DC_get0_publickey(s->session->peer_dc); } #endif if (pkey == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } #ifndef OPENSSL_NO_SM2 if (EVP_PKEY_is_sm2(pkey)) { if (!EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } } #endif if (ssl_cert_lookup_by_pkey(pkey, NULL) == NULL) { SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); goto err; } if (SSL_USE_SIGALGS(s)) { unsigned int sigalg; if (!PACKET_get_net_2(pkt, &sigalg)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_PACKET); goto err; } if (tls12_check_peer_sigalg(s, sigalg, pkey) <= 0) { /* SSLfatal() already called */ goto err; } #ifndef OPENSSL_NO_DELEGATED_CREDENTIAL /* * Verify that dc expected_cert_verify_algorithm matches the scheme * indicated in the server's CertificateVerify message. */ if (s->delegated_credential_tag & DC_HAS_BEEN_USED_FOR_VERIFY_PEER) { if (s->session->peer_dc == NULL) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } if (DC_get_expected_cert_verify_algorithm(s->session->peer_dc) != sigalg) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } } #endif } else if (!tls1_set_peer_legacy_sigalg(s, pkey)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } if (!tls1_lookup_md(s->s3->tmp.peer_sigalg, &md)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } #ifdef SSL_DEBUG if (SSL_USE_SIGALGS(s)) fprintf(stderr, "USING TLSv1.2 HASH %s\n", md == NULL ? "n/a" : EVP_MD_name(md)); #endif /* Check for broken implementations of GOST ciphersuites */ /* * If key is GOST and len is exactly 64 or 128, it is signature without * length field (CryptoPro implementations at least till TLS 1.2) */ #ifndef OPENSSL_NO_GOST if (!SSL_USE_SIGALGS(s) && ((PACKET_remaining(pkt) == 64 && (EVP_PKEY_id(pkey) == NID_id_GostR3410_2001 || EVP_PKEY_id(pkey) == NID_id_GostR3410_2012_256)) || (PACKET_remaining(pkt) == 128 && EVP_PKEY_id(pkey) == NID_id_GostR3410_2012_512))) { len = PACKET_remaining(pkt); } else #endif if (!PACKET_get_net_2(pkt, &len)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); goto err; } j = EVP_PKEY_size(pkey); if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) || (PACKET_remaining(pkt) == 0)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); goto err; } if (!PACKET_get_bytes(pkt, &data, len)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); goto err; } if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) { /* SSLfatal() already called */ goto err; } #ifdef SSL_DEBUG fprintf(stderr, "Using client verify alg %s\n", md == NULL ? "n/a" : EVP_MD_name(md)); #endif #ifndef OPENSSL_NO_SM2 if (EVP_PKEY_is_sm2(pkey)) { pctx = EVP_PKEY_CTX_new(pkey, NULL); if (EVP_PKEY_CTX_set1_id(pctx, HANDSHAKE_SM2_ID, HANDSHAKE_SM2_ID_LEN) != 1) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); } EVP_MD_CTX_set_pkey_ctx(mctx, pctx); } #endif if (EVP_DigestVerifyInit(mctx, &pctx, md, NULL, pkey) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } #ifndef OPENSSL_NO_GOST { int pktype = EVP_PKEY_id(pkey); if (pktype == NID_id_GostR3410_2001 || pktype == NID_id_GostR3410_2012_256 || pktype == NID_id_GostR3410_2012_512) { if ((gost_data = OPENSSL_malloc(len)) == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } BUF_reverse(gost_data, data, len); data = gost_data; } } #endif if (SSL_USE_PSS(s)) { if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } } if (s->version == SSL3_VERSION) { if (EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0 || !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, (int)s->session->master_key_length, s->session->master_key)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); goto err; } if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) { SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); goto err; } } else { j = EVP_DigestVerify(mctx, data, len, hdata, hdatalen); if (j <= 0) { SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); goto err; } } /* * In TLSv1.3 on the client side we make sure we prepare the client * certificate after the CertVerify instead of when we get the * CertificateRequest. This is because in TLSv1.3 the CertificateRequest * comes *before* the Certificate message. In TLSv1.2 it comes after. We * want to make sure that SSL_get_peer_certificate() will return the actual * server certificate from the client_cert_cb callback. */ if (!s->server && SSL_IS_TLS13(s) && s->s3->tmp.cert_req == 1) ret = MSG_PROCESS_CONTINUE_PROCESSING; else ret = MSG_PROCESS_CONTINUE_READING; err: BIO_free(s->s3->handshake_buffer); s->s3->handshake_buffer = NULL; EVP_MD_CTX_free(mctx); #ifndef OPENSSL_NO_GOST OPENSSL_free(gost_data); #endif #ifndef OPENSSL_NO_SM2 if (pkey != NULL && EVP_PKEY_is_sm2(pkey)) { /*other sig call EVP_PKEY_CTX_free there may cause segfault */ EVP_PKEY_CTX_free(pctx); } #endif return ret; } int tls_construct_finished(SSL *s, WPACKET *pkt) { size_t finish_md_len; const char *sender; size_t slen; /* This is a real handshake so make sure we clean it up at the end */ if (!s->server && s->post_handshake_auth != SSL_PHA_REQUESTED) s->statem.cleanuphand = 1; /* * We only change the keys if we didn't already do this when we sent the * client certificate */ if (SSL_IS_TLS13(s) && !s->server && s->s3->tmp.cert_req == 0 && (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE))) {; /* SSLfatal() already called */ return 0; } if (s->server) { sender = s->method->ssl3_enc->server_finished_label; slen = s->method->ssl3_enc->server_finished_label_len; } else { sender = s->method->ssl3_enc->client_finished_label; slen = s->method->ssl3_enc->client_finished_label_len; } finish_md_len = s->method->ssl3_enc->final_finish_mac(s, sender, slen, s->s3->tmp.finish_md); if (finish_md_len == 0) { /* SSLfatal() already called */ return 0; } s->s3->tmp.finish_md_len = finish_md_len; if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, finish_md_len)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); return 0; } /* * Log the master secret, if logging is enabled. We don't log it for * TLSv1.3: there's a different key schedule for that. */ if (!SSL_IS_TLS13(s) && !ssl_log_secret(s, MASTER_SECRET_LABEL, s->session->master_key, s->session->master_key_length)) { /* SSLfatal() already called */ return 0; } /* * Copy the finished so we can use it for renegotiation checks */ if (!ossl_assert(finish_md_len <= EVP_MAX_MD_SIZE)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); return 0; } if (!s->server) { memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, finish_md_len); s->s3->previous_client_finished_len = finish_md_len; } else { memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, finish_md_len); s->s3->previous_server_finished_len = finish_md_len; } return 1; } int tls_construct_key_update(SSL *s, WPACKET *pkt) { #ifndef OPENSSL_NO_QUIC if (SSL_IS_QUIC(s)) { /* TLS KeyUpdate is not used for QUIC, so this is an error. */ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_KEY_UPDATE, ERR_R_INTERNAL_ERROR); return 0; } #endif if (!WPACKET_put_bytes_u8(pkt, s->key_update)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_KEY_UPDATE, ERR_R_INTERNAL_ERROR); return 0; } s->key_update = SSL_KEY_UPDATE_NONE; return 1; } MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt) { unsigned int updatetype; /* * A KeyUpdate message signals a key change so the end of the message must * be on a record boundary. */ if (RECORD_LAYER_processed_read_pending(&s->rlayer)) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_KEY_UPDATE, SSL_R_NOT_ON_RECORD_BOUNDARY); return MSG_PROCESS_ERROR; } #ifndef OPENSSL_NO_QUIC if (SSL_is_quic(s)) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_KEY_UPDATE, SSL_R_UNEXPECTED_MESSAGE); return MSG_PROCESS_ERROR; } #endif if (!PACKET_get_1(pkt, &updatetype) || PACKET_remaining(pkt) != 0) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_UPDATE, SSL_R_BAD_KEY_UPDATE); return MSG_PROCESS_ERROR; } /* * There are only two defined key update types. Fail if we get a value we * didn't recognise. */ if (updatetype != SSL_KEY_UPDATE_NOT_REQUESTED && updatetype != SSL_KEY_UPDATE_REQUESTED) { SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_KEY_UPDATE, SSL_R_BAD_KEY_UPDATE); return MSG_PROCESS_ERROR; } /* * If we get a request for us to update our sending keys too then, we need * to additionally send a KeyUpdate message. However that message should * not also request an update (otherwise we get into an infinite loop). */ if (updatetype == SSL_KEY_UPDATE_REQUESTED) s->key_update = SSL_KEY_UPDATE_NOT_REQUESTED; if (!tls13_update_key(s, 0)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } return MSG_PROCESS_FINISHED_READING; } /* * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen * to far. */ int ssl3_take_mac(SSL *s) { const char *sender; size_t slen; if (!s->server) { sender = s->method->ssl3_enc->server_finished_label; slen = s->method->ssl3_enc->server_finished_label_len; } else { sender = s->method->ssl3_enc->client_finished_label; slen = s->method->ssl3_enc->client_finished_label_len; } s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, sender, slen, s->s3->tmp.peer_finish_md); if (s->s3->tmp.peer_finish_md_len == 0) { /* SSLfatal() already called */ return 0; } return 1; } MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) { size_t remain; remain = PACKET_remaining(pkt); /* * 'Change Cipher Spec' is just a single byte, which should already have * been consumed by ssl_get_message() so there should be no bytes left, * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes */ if (SSL_IS_DTLS(s)) { if ((s->version == DTLS1_BAD_VER && remain != DTLS1_CCS_HEADER_LENGTH + 1) || (s->version != DTLS1_BAD_VER && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_BAD_CHANGE_CIPHER_SPEC); return MSG_PROCESS_ERROR; } } else { if (remain != 0) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_BAD_CHANGE_CIPHER_SPEC); return MSG_PROCESS_ERROR; } } /* Check we have a cipher to change to */ if (s->s3->tmp.new_cipher == NULL) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); return MSG_PROCESS_ERROR; } s->s3->change_cipher_spec = 1; if (!ssl3_do_change_cipher_spec(s)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); return MSG_PROCESS_ERROR; } if (SSL_IS_DTLS(s)) { dtls1_reset_seq_numbers(s, SSL3_CC_READ); if (s->version == DTLS1_BAD_VER) s->d1->handshake_read_seq++; #ifndef OPENSSL_NO_SCTP /* * Remember that a CCS has been received, so that an old key of * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no * SCTP is used */ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); #endif } return MSG_PROCESS_CONTINUE_READING; } MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) { size_t md_len; /* This is a real handshake so make sure we clean it up at the end */ if (s->server) { /* * To get this far we must have read encrypted data from the client. We * no longer tolerate unencrypted alerts. This value is ignored if less * than TLSv1.3 */ s->statem.enc_read_state = ENC_READ_STATE_VALID; if (s->post_handshake_auth != SSL_PHA_REQUESTED) s->statem.cleanuphand = 1; if (SSL_IS_TLS13(s) && !tls13_save_handshake_digest_for_pha(s)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } } /* * In TLSv1.3 a Finished message signals a key change so the end of the * message must be on a record boundary. */ if (SSL_IS_TLS13(s) && RECORD_LAYER_processed_read_pending(&s->rlayer)) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_FINISHED, SSL_R_NOT_ON_RECORD_BOUNDARY); return MSG_PROCESS_ERROR; } /* If this occurs, we have missed a message */ if (!SSL_IS_TLS13(s) && !s->s3->change_cipher_spec) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); return MSG_PROCESS_ERROR; } s->s3->change_cipher_spec = 0; md_len = s->s3->tmp.peer_finish_md_len; if (md_len != PACKET_remaining(pkt)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); return MSG_PROCESS_ERROR; } if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, md_len) != 0) { SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); return MSG_PROCESS_ERROR; } /* * Copy the finished so we can use it for renegotiation checks */ if (!ossl_assert(md_len <= EVP_MAX_MD_SIZE)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_FINISHED, ERR_R_INTERNAL_ERROR); return MSG_PROCESS_ERROR; } if (s->server) { memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, md_len); s->s3->previous_client_finished_len = md_len; } else { memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, md_len); s->s3->previous_server_finished_len = md_len; } /* * In TLS1.3 we also have to change cipher state and do any final processing * of the initial server flight (if we are a client) */ if (SSL_IS_TLS13(s)) { if (s->server) { if (s->post_handshake_auth != SSL_PHA_REQUESTED && !s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_READ)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } } else { /* TLS 1.3 gets the secret size from the handshake md */ size_t dummy; if (!s->method->ssl3_enc->generate_master_secret(s, s->master_secret, s->handshake_secret, 0, &dummy)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_READ)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } if (!tls_process_initial_server_flight(s)) { /* SSLfatal() already called */ return MSG_PROCESS_ERROR; } } } return MSG_PROCESS_FINISHED_READING; } int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) { if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); return 0; } return 1; } /* Add a certificate to the WPACKET */ static int ssl_add_cert_to_wpacket(SSL *s, WPACKET *pkt, X509 *x, int chain) { int len; unsigned char *outbytes; len = i2d_X509(x, NULL); if (len < 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_TO_WPACKET, ERR_R_BUF_LIB); return 0; } if (!WPACKET_sub_allocate_bytes_u24(pkt, len, &outbytes) || i2d_X509(x, &outbytes) != len) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_TO_WPACKET, ERR_R_INTERNAL_ERROR); return 0; } if (SSL_IS_TLS13(s) && !tls_construct_extensions(s, pkt, SSL_EXT_TLS1_3_CERTIFICATE, x, chain)) { /* SSLfatal() already called */ return 0; } return 1; } /* Add certificate chain to provided WPACKET */ static int ssl_add_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) { int i, chain_count; X509 *x; STACK_OF(X509) *extra_certs; STACK_OF(X509) *chain = NULL; X509_STORE *chain_store; if (cpk == NULL || cpk->x509 == NULL) return 1; x = cpk->x509; /* * If we have a certificate specific chain use it, else use parent ctx. */ if (cpk->chain != NULL) extra_certs = cpk->chain; else extra_certs = s->ctx->extra_certs; if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs) chain_store = NULL; else if (s->cert->chain_store) chain_store = s->cert->chain_store; else chain_store = s->ctx->cert_store; if (chain_store != NULL) { X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new(); if (xs_ctx == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); return 0; } if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) { X509_STORE_CTX_free(xs_ctx); SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_X509_LIB); return 0; } /* * It is valid for the chain not to be complete (because normally we * don't include the root cert in the chain). Therefore we deliberately * ignore the error return from this call. We're not actually verifying * the cert - we're just building as much of the chain as we can */ (void)X509_verify_cert(xs_ctx); /* Don't leave errors in the queue */ ERR_clear_error(); chain = X509_STORE_CTX_get0_chain(xs_ctx); i = ssl_security_cert_chain(s, chain, NULL, 0); if (i != 1) { #if 0 /* Dummy error calls so mkerr generates them */ SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK); #endif X509_STORE_CTX_free(xs_ctx); SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN, i); return 0; } chain_count = sk_X509_num(chain); for (i = 0; i < chain_count; i++) { x = sk_X509_value(chain, i); if (!ssl_add_cert_to_wpacket(s, pkt, x, i)) { /* SSLfatal() already called */ X509_STORE_CTX_free(xs_ctx); return 0; } } X509_STORE_CTX_free(xs_ctx); } else { i = ssl_security_cert_chain(s, extra_certs, x, 0); if (i != 1) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN, i); return 0; } if (!ssl_add_cert_to_wpacket(s, pkt, x, 0)) { /* SSLfatal() already called */ return 0; } for (i = 0; i < sk_X509_num(extra_certs); i++) { x = sk_X509_value(extra_certs, i); if (!ssl_add_cert_to_wpacket(s, pkt, x, i + 1)) { /* SSLfatal() already called */ return 0; } } } return 1; } unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) { if (!WPACKET_start_sub_packet_u24(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); return 0; } if (!ssl_add_cert_chain(s, pkt, cpk)) return 0; if (!WPACKET_close(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); return 0; } return 1; } /* * Tidy up after the end of a handshake. In the case of SCTP this may result * in NBIO events. If |clearbufs| is set then init_buf and the wbio buffer is * freed up as well. */ WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs, int stop) { void (*cb) (const SSL *ssl, int type, int val) = NULL; int cleanuphand = s->statem.cleanuphand; #ifndef OPENSSL_NO_GLOBAL_SESSION_CACHE if (s->global_session_state == SSL_SESS_STAT_WAITING_NEW) goto new_session_reentry; #endif if (clearbufs) { if (!SSL_IS_DTLS(s) #ifndef OPENSSL_NO_SCTP /* * RFC6083: SCTP provides a reliable and in-sequence transport service for DTLS * messages that require it. Therefore, DTLS procedures for retransmissions * MUST NOT be used. * Hence the init_buf can be cleared when DTLS over SCTP as transport is used. */ || BIO_dgram_is_sctp(SSL_get_wbio(s)) #endif ) { /* * We don't do this in DTLS over UDP because we may still need the init_buf * in case there are any unexpected retransmits */ BUF_MEM_free(s->init_buf); s->init_buf = NULL; } if (!ssl_free_wbio_buffer(s)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_FINISH_HANDSHAKE, ERR_R_INTERNAL_ERROR); return WORK_ERROR; } s->init_num = 0; } if (SSL_IS_TLS13(s) && !s->server && s->post_handshake_auth == SSL_PHA_REQUESTED) s->post_handshake_auth = SSL_PHA_EXT_SENT; /* * Only set if there was a Finished message and this isn't after a TLSv1.3 * post handshake exchange */ if (cleanuphand) { /* skipped if we just sent a HelloRequest */ s->renegotiate = 0; s->new_session = 0; s->statem.cleanuphand = 0; s->ext.ticket_expected = 0; ssl3_cleanup_key_block(s); if (s->server) { #ifndef OPENSSL_NO_GLOBAL_SESSION_CACHE new_session_reentry: #endif /* * In TLSv1.3 we update the cache as part of constructing the * NewSessionTicket */ #ifndef OPENSSL_NO_GLOBAL_SESSION_CACHE if (!SSL_IS_TLS13(s)) { ssl_update_cache(s, SSL_SESS_CACHE_SERVER); if (s->global_session_state == SSL_SESS_STAT_WAITING_NEW) return WORK_FINISHED_PAUSE_NEW_SESSION; } #else if (!SSL_IS_TLS13(s)) ssl_update_cache(s, SSL_SESS_CACHE_SERVER); #endif /* N.B. s->ctx may not equal s->session_ctx */ tsan_counter(&s->ctx->stats.sess_accept_good); s->handshake_func = ossl_statem_accept; } else { if (SSL_IS_TLS13(s)) { /* * We encourage applications to only use TLSv1.3 tickets once, * so we remove this one from the cache. */ if ((s->session_ctx->session_cache_mode & SSL_SESS_CACHE_CLIENT) != 0) SSL_CTX_remove_session(s->session_ctx, s->session); } else { /* * In TLSv1.3 we update the cache as part of processing the * NewSessionTicket */ ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); } if (s->hit) tsan_counter(&s->session_ctx->stats.sess_hit); s->handshake_func = ossl_statem_connect; tsan_counter(&s->session_ctx->stats.sess_connect_good); } if (SSL_IS_DTLS(s)) { /* done with handshaking */ s->d1->handshake_read_seq = 0; s->d1->handshake_write_seq = 0; s->d1->next_handshake_write_seq = 0; dtls1_clear_received_buffer(s); } } if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; /* The callback may expect us to not be in init at handshake done */ ossl_statem_set_in_init(s, 0); if (cb != NULL) { if (cleanuphand || !SSL_IS_TLS13(s) || SSL_IS_FIRST_HANDSHAKE(s)) cb(s, SSL_CB_HANDSHAKE_DONE, 1); } if (!stop) { /* If we've got more work to do we go back into init */ ossl_statem_set_in_init(s, 1); return WORK_FINISHED_CONTINUE; } return WORK_FINISHED_STOP; } int tls_get_message_header(SSL *s, int *mt) { /* s->init_num < SSL3_HM_HEADER_LENGTH */ int skip_message, i, recvd_type; unsigned char *p; size_t l, readbytes; p = (unsigned char *)s->init_buf->data; do { while (s->init_num < SSL3_HM_HEADER_LENGTH) { /* QUIC: either create a special ssl_read_bytes... or if/else this */ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, &p[s->init_num], SSL3_HM_HEADER_LENGTH - s->init_num, 0, &readbytes); if (i <= 0) { s->rwstate = SSL_READING; return 0; } if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { /* * A ChangeCipherSpec must be a single byte and may not occur * in the middle of a handshake message. */ if (s->init_num != 0 || readbytes != 1 || p[0] != SSL3_MT_CCS) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_BAD_CHANGE_CIPHER_SPEC); return 0; } if (s->statem.hand_state == TLS_ST_BEFORE && (s->s3->flags & TLS1_FLAGS_STATELESS) != 0) { /* * We are stateless and we received a CCS. Probably this is * from a client between the first and second ClientHellos. * We should ignore this, but return an error because we do * not return success until we see the second ClientHello * with a valid cookie. */ return 0; } s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; s->init_num = readbytes - 1; s->init_msg = s->init_buf->data; s->s3->tmp.message_size = readbytes; return 1; } else if (recvd_type != SSL3_RT_HANDSHAKE) { SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); return 0; } s->init_num += readbytes; } skip_message = 0; if (!s->server) if (s->statem.hand_state != TLS_ST_OK && p[0] == SSL3_MT_HELLO_REQUEST) /* * The server may always send 'Hello Request' messages -- * we are doing a handshake anyway now, so ignore them if * their format is correct. Does not count for 'Finished' * MAC. */ if (p[1] == 0 && p[2] == 0 && p[3] == 0) { s->init_num = 0; skip_message = 1; if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, SSL3_HM_HEADER_LENGTH, s, s->msg_callback_arg); } } while (skip_message); /* s->init_num == SSL3_HM_HEADER_LENGTH */ *mt = *p; s->s3->tmp.message_type = *(p++); if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { /* * Only happens with SSLv3+ in an SSLv2 backward compatible * ClientHello * * Total message size is the remaining record bytes to read * plus the SSL3_HM_HEADER_LENGTH bytes that we already read */ l = RECORD_LAYER_get_rrec_length(&s->rlayer) + SSL3_HM_HEADER_LENGTH; s->s3->tmp.message_size = l; s->init_msg = s->init_buf->data; s->init_num = SSL3_HM_HEADER_LENGTH; } else { n2l3(p, l); /* BUF_MEM_grow takes an 'int' parameter */ if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); return 0; } s->s3->tmp.message_size = l; s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; s->init_num = 0; } return 1; } int tls_get_message_body(SSL *s, size_t *len) { size_t n, readbytes; unsigned char *p; int i; if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { /* We've already read everything in */ *len = (unsigned long)s->init_num; return 1; } p = s->init_msg; n = s->s3->tmp.message_size - s->init_num; while (n > 0) { i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, &p[s->init_num], n, 0, &readbytes); if (i <= 0) { s->rwstate = SSL_READING; *len = 0; return 0; } s->init_num += readbytes; n -= readbytes; } /* * If receiving Finished, record MAC of prior handshake messages for * Finished verification. */ if (*(s->init_buf->data) == SSL3_MT_FINISHED && !ssl3_take_mac(s)) { /* SSLfatal() already called */ *len = 0; return 0; } /* Feed this message into MAC computation. */ if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num)) { /* SSLfatal() already called */ *len = 0; return 0; } if (s->msg_callback) s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, (size_t)s->init_num, s, s->msg_callback_arg); } else { /* * We defer feeding in the HRR until later. We'll do it as part of * processing the message * The TLsv1.3 handshake transcript stops at the ClientFinished * message. */ #define SERVER_HELLO_RANDOM_OFFSET (SSL3_HM_HEADER_LENGTH + 2) /* KeyUpdate and NewSessionTicket do not need to be added */ if (!SSL_IS_TLS13(s) || (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET && s->s3->tmp.message_type != SSL3_MT_KEY_UPDATE)) { if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO || s->init_num < SERVER_HELLO_RANDOM_OFFSET + SSL3_RANDOM_SIZE || memcmp(hrrrandom, s->init_buf->data + SERVER_HELLO_RANDOM_OFFSET, SSL3_RANDOM_SIZE) != 0) { if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + SSL3_HM_HEADER_LENGTH)) { /* SSLfatal() already called */ *len = 0; return 0; } } } if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, s->msg_callback_arg); } *len = s->init_num; return 1; } static const X509ERR2ALERT x509table[] = { {X509_V_ERR_APPLICATION_VERIFICATION, SSL_AD_HANDSHAKE_FAILURE}, {X509_V_ERR_CA_KEY_TOO_SMALL, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_EC_KEY_EXPLICIT_PARAMS, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CA_MD_TOO_WEAK, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CERT_CHAIN_TOO_LONG, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_CERT_HAS_EXPIRED, SSL_AD_CERTIFICATE_EXPIRED}, {X509_V_ERR_CERT_NOT_YET_VALID, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CERT_REJECTED, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CERT_REVOKED, SSL_AD_CERTIFICATE_REVOKED}, {X509_V_ERR_CERT_SIGNATURE_FAILURE, SSL_AD_DECRYPT_ERROR}, {X509_V_ERR_CERT_UNTRUSTED, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CRL_HAS_EXPIRED, SSL_AD_CERTIFICATE_EXPIRED}, {X509_V_ERR_CRL_NOT_YET_VALID, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_CRL_SIGNATURE_FAILURE, SSL_AD_DECRYPT_ERROR}, {X509_V_ERR_DANE_NO_MATCH, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_EE_KEY_TOO_SMALL, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_EMAIL_MISMATCH, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_HOSTNAME_MISMATCH, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_INVALID_CA, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_INVALID_CALL, SSL_AD_INTERNAL_ERROR}, {X509_V_ERR_INVALID_PURPOSE, SSL_AD_UNSUPPORTED_CERTIFICATE}, {X509_V_ERR_IP_ADDRESS_MISMATCH, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_OUT_OF_MEM, SSL_AD_INTERNAL_ERROR}, {X509_V_ERR_PATH_LENGTH_EXCEEDED, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_STORE_LOOKUP, SSL_AD_INTERNAL_ERROR}, {X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE, SSL_AD_BAD_CERTIFICATE}, {X509_V_ERR_UNABLE_TO_GET_CRL, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE, SSL_AD_UNKNOWN_CA}, {X509_V_ERR_UNSPECIFIED, SSL_AD_INTERNAL_ERROR}, /* Last entry; return this if we don't find the value above. */ {X509_V_OK, SSL_AD_CERTIFICATE_UNKNOWN} }; int ssl_x509err2alert(int x509err) { const X509ERR2ALERT *tp; for (tp = x509table; tp->x509err != X509_V_OK; ++tp) if (tp->x509err == x509err) break; return tp->alert; } int ssl_allow_compression(SSL *s) { if (s->options & SSL_OP_NO_COMPRESSION) return 0; return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); } static int version_cmp(const SSL *s, int a, int b) { int dtls = SSL_IS_DTLS(s); if (a == b) return 0; if (!dtls) return a < b ? -1 : 1; return DTLS_VERSION_LT(a, b) ? -1 : 1; } typedef struct { int version; const SSL_METHOD *(*cmeth) (void); const SSL_METHOD *(*smeth) (void); } version_info; #if TLS_MAX_VERSION != TLS1_3_VERSION # error Code needs update for TLS_method() support beyond TLS1_3_VERSION. #endif /* Must be in order high to low */ static const version_info tls_version_table[] = { #ifndef OPENSSL_NO_TLS1_3 {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method}, #else {TLS1_3_VERSION, NULL, NULL}, #endif #ifndef OPENSSL_NO_TLS1_2 {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, #else {TLS1_2_VERSION, NULL, NULL}, #endif #ifndef OPENSSL_NO_TLS1_1 {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, #else {TLS1_1_VERSION, NULL, NULL}, #endif #ifndef OPENSSL_NO_TLS1 {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, #else {TLS1_VERSION, NULL, NULL}, #endif #ifndef OPENSSL_NO_SSL3 {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, #else {SSL3_VERSION, NULL, NULL}, #endif {0, NULL, NULL}, }; #if DTLS_MAX_VERSION != DTLS1_2_VERSION # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. #endif /* Must be in order high to low */ static const version_info dtls_version_table[] = { #ifndef OPENSSL_NO_DTLS1_2 {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, #else {DTLS1_2_VERSION, NULL, NULL}, #endif #ifndef OPENSSL_NO_DTLS1 {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, #else {DTLS1_VERSION, NULL, NULL}, {DTLS1_BAD_VER, NULL, NULL}, #endif {0, NULL, NULL}, }; /* * ssl_method_error - Check whether an SSL_METHOD is enabled. * * @s: The SSL handle for the candidate method * @method: the intended method. * * Returns 0 on success, or an SSL error reason on failure. */ static int ssl_method_error(const SSL *s, const SSL_METHOD *method) { int version = method->version; if ((s->min_proto_version != 0 && version_cmp(s, version, s->min_proto_version) < 0) || ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) return SSL_R_VERSION_TOO_LOW; if (s->max_proto_version != 0 && version_cmp(s, version, s->max_proto_version) > 0) return SSL_R_VERSION_TOO_HIGH; if ((s->options & method->mask) != 0) return SSL_R_UNSUPPORTED_PROTOCOL; if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; return 0; } /* * Only called by servers. Returns 1 if the server has a TLSv1.3 capable * certificate type, or has PSK or a certificate callback configured. Otherwise * returns 0. */ static int is_tls13_capable(const SSL *s) { int i; #ifndef OPENSSL_NO_EC int curve; EC_KEY *eckey; #endif #ifndef OPENSSL_NO_PSK if (s->psk_server_callback != NULL) return 1; #endif if (s->psk_find_session_cb != NULL || s->cert->cert_cb != NULL) return 1; for (i = 0; i < SSL_PKEY_NUM; i++) { /* Skip over certs disallowed for TLSv1.3 */ switch (i) { case SSL_PKEY_DSA_SIGN: case SSL_PKEY_GOST01: case SSL_PKEY_GOST12_256: case SSL_PKEY_GOST12_512: continue; default: break; } #ifndef OPENSSL_NO_DELEGATED_CREDENTIAL if (s->enable_sign_by_dc && ssl_has_dc(s, i)) { /* nothing */ } else #endif if (!ssl_has_cert(s, i)) continue; #ifndef OPENSSL_NO_EC if (i != SSL_PKEY_ECC) return 1; /* * Prior to TLSv1.3 sig algs allowed any curve to be used. TLSv1.3 is * more restrictive so check that our sig algs are consistent with this * EC cert. See section 4.2.3 of RFC8446. */ #ifndef OPENSSL_NO_DELEGATED_CREDENTIAL if (s->enable_sign_by_dc && ssl_has_dc(s, SSL_PKEY_ECC)) { eckey = EVP_PKEY_get0_EC_KEY(s->cert->dc_pkeys[SSL_PKEY_ECC].privatekey); } else #endif eckey = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[SSL_PKEY_ECC].privatekey); if (eckey == NULL) continue; curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(eckey)); if (tls_check_sigalg_curve(s, curve)) return 1; #else return 1; #endif } return 0; } /* * ssl_version_supported - Check that the specified `version` is supported by * `SSL *` instance * * @s: The SSL handle for the candidate method * @version: Protocol version to test against * * Returns 1 when supported, otherwise 0 */ int ssl_version_supported(const SSL *s, int version, const SSL_METHOD **meth) { const version_info *vent; const version_info *table; switch (s->method->version) { default: /* Version should match method version for non-ANY method */ return version_cmp(s, version, s->version) == 0; case TLS_ANY_VERSION: table = tls_version_table; break; case DTLS_ANY_VERSION: table = dtls_version_table; break; } for (vent = table; vent->version != 0 && version_cmp(s, version, vent->version) <= 0; ++vent) { if (vent->cmeth != NULL && version_cmp(s, version, vent->version) == 0 && ssl_method_error(s, vent->cmeth()) == 0 && (!s->server || version != TLS1_3_VERSION || is_tls13_capable(s))) { if (meth != NULL) *meth = vent->cmeth(); return 1; } } return 0; } /* * ssl_check_version_downgrade - In response to RFC7507 SCSV version * fallback indication from a client check whether we're using the highest * supported protocol version. * * @s server SSL handle. * * Returns 1 when using the highest enabled version, 0 otherwise. */ int ssl_check_version_downgrade(SSL *s) { const version_info *vent; const version_info *table; /* * Check that the current protocol is the highest enabled version * (according to s->ctx->method, as version negotiation may have changed * s->method). */ if (s->version == s->ctx->method->version) return 1; /* * Apparently we're using a version-flexible SSL_METHOD (not at its * highest protocol version). */ if (s->ctx->method->version == TLS_method()->version) table = tls_version_table; else if (s->ctx->method->version == DTLS_method()->version) table = dtls_version_table; else { /* Unexpected state; fail closed. */ return 0; } for (vent = table; vent->version != 0; ++vent) { if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) return s->version == vent->version; } return 0; } /* * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS * protocols, provided the initial (D)TLS method is version-flexible. This * function sanity-checks the proposed value and makes sure the method is * version-flexible, then sets the limit if all is well. * * @method_version: The version of the current SSL_METHOD. * @version: the intended limit. * @bound: pointer to limit to be updated. * * Returns 1 on success, 0 on failure. */ int ssl_set_version_bound(int method_version, int version, int *bound) { if (version == 0) { *bound = version; return 1; } /*- * Restrict TLS methods to TLS protocol versions. * Restrict DTLS methods to DTLS protocol versions. * Note, DTLS version numbers are decreasing, use comparison macros. * * Note that for both lower-bounds we use explicit versions, not * (D)TLS_MIN_VERSION. This is because we don't want to break user * configurations. If the MIN (supported) version ever rises, the user's * "floor" remains valid even if no longer available. We don't expect the * MAX ceiling to ever get lower, so making that variable makes sense. */ switch (method_version) { default: /* * XXX For fixed version methods, should we always fail and not set any * bounds, always succeed and not set any bounds, or set the bounds and * arrange to fail later if they are not met? At present fixed-version * methods are not subject to controls that disable individual protocol * versions. */ return 0; case TLS_ANY_VERSION: if (version < SSL3_VERSION || version > TLS_MAX_VERSION) return 0; break; case DTLS_ANY_VERSION: if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || DTLS_VERSION_LT(version, DTLS1_BAD_VER)) return 0; break; } *bound = version; return 1; } static void check_for_downgrade(SSL *s, int vers, DOWNGRADE *dgrd) { if (vers == TLS1_2_VERSION && ssl_version_supported(s, TLS1_3_VERSION, NULL)) { *dgrd = DOWNGRADE_TO_1_2; } else if (!SSL_IS_DTLS(s) && vers < TLS1_2_VERSION /* * We need to ensure that a server that disables TLSv1.2 * (creating a hole between TLSv1.3 and TLSv1.1) can still * complete handshakes with clients that support TLSv1.2 and * below. Therefore we do not enable the sentinel if TLSv1.3 is * enabled and TLSv1.2 is not. */ && ssl_version_supported(s, TLS1_2_VERSION, NULL)) { *dgrd = DOWNGRADE_TO_1_1; } else { *dgrd = DOWNGRADE_NONE; } } /* * ssl_choose_server_version - Choose server (D)TLS version. Called when the * client HELLO is received to select the final server protocol version and * the version specific method. * * @s: server SSL handle. * * Returns 0 on success or an SSL error reason number on failure. */ int ssl_choose_server_version(SSL *s, CLIENTHELLO_MSG *hello, DOWNGRADE *dgrd) { /*- * With version-flexible methods we have an initial state with: * * s->method->version == (D)TLS_ANY_VERSION, * s->version == (D)TLS_MAX_VERSION. * * So we detect version-flexible methods via the method version, not the * handle version. */ int server_version = s->method->version; int client_version = hello->legacy_version; const version_info *vent; const version_info *table; int disabled = 0; RAW_EXTENSION *suppversions; s->client_version = client_version; switch (server_version) { default: if (!SSL_IS_TLS13(s)) { if (version_cmp(s, client_version, s->version) < 0) return SSL_R_WRONG_SSL_VERSION; *dgrd = DOWNGRADE_NONE; /* * If this SSL handle is not from a version flexible method we don't * (and never did) check min/max FIPS or Suite B constraints. Hope * that's OK. It is up to the caller to not choose fixed protocol * versions they don't want. If not, then easy to fix, just return * ssl_method_error(s, s->method) */ return 0; } /* * Fall through if we are TLSv1.3 already (this means we must be after * a HelloRetryRequest */ /* fall thru */ case TLS_ANY_VERSION: table = tls_version_table; break; case DTLS_ANY_VERSION: table = dtls_version_table; break; } suppversions = &hello->pre_proc_exts[TLSEXT_IDX_supported_versions]; /* If we did an HRR then supported versions is mandatory */ if (!suppversions->present && s->hello_retry_request != SSL_HRR_NONE) return SSL_R_UNSUPPORTED_PROTOCOL; if (suppversions->present && !SSL_IS_DTLS(s)) { unsigned int candidate_vers = 0; unsigned int best_vers = 0; const SSL_METHOD *best_method = NULL; PACKET versionslist; suppversions->parsed = 1; if (!PACKET_as_length_prefixed_1(&suppversions->data, &versionslist)) { /* Trailing or invalid data? */ return SSL_R_LENGTH_MISMATCH; } /* * The TLSv1.3 spec says the client MUST set this to TLS1_2_VERSION. * The spec only requires servers to check that it isn't SSLv3: * "Any endpoint receiving a Hello message with * ClientHello.legacy_version or ServerHello.legacy_version set to * 0x0300 MUST abort the handshake with a "protocol_version" alert." * We are slightly stricter and require that it isn't SSLv3 or lower. * We tolerate TLSv1 and TLSv1.1. */ if (client_version <= SSL3_VERSION) return SSL_R_BAD_LEGACY_VERSION; while (PACKET_get_net_2(&versionslist, &candidate_vers)) { if (version_cmp(s, candidate_vers, best_vers) <= 0) continue; if (ssl_version_supported(s, candidate_vers, &best_method)) best_vers = candidate_vers; } if (PACKET_remaining(&versionslist) != 0) { /* Trailing data? */ return SSL_R_LENGTH_MISMATCH; } if (best_vers > 0) { if (s->hello_retry_request != SSL_HRR_NONE) { /* * This is after a HelloRetryRequest so we better check that we * negotiated TLSv1.3 */ if (best_vers != TLS1_3_VERSION) return SSL_R_UNSUPPORTED_PROTOCOL; return 0; } check_for_downgrade(s, best_vers, dgrd); s->version = best_vers; s->method = best_method; return 0; } return SSL_R_UNSUPPORTED_PROTOCOL; } /* * If the supported versions extension isn't present, then the highest * version we can negotiate is TLSv1.2 */ if (version_cmp(s, client_version, TLS1_3_VERSION) >= 0) client_version = TLS1_2_VERSION; /* * No supported versions extension, so we just use the version supplied in * the ClientHello. */ for (vent = table; vent->version != 0; ++vent) { const SSL_METHOD *method; if (vent->smeth == NULL || version_cmp(s, client_version, vent->version) < 0) continue; method = vent->smeth(); if (ssl_method_error(s, method) == 0) { check_for_downgrade(s, vent->version, dgrd); s->version = vent->version; s->method = method; return 0; } disabled = 1; } return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; } /* * ssl_choose_client_version - Choose client (D)TLS version. Called when the * server HELLO is received to select the final client protocol version and * the version specific method. * * @s: client SSL handle. * @version: The proposed version from the server's HELLO. * @extensions: The extensions received * * Returns 1 on success or 0 on error. */ int ssl_choose_client_version(SSL *s, int version, RAW_EXTENSION *extensions) { const version_info *vent; const version_info *table; int ret, ver_min, ver_max, real_max, origv; origv = s->version; s->version = version; /* This will overwrite s->version if the extension is present */ if (!tls_parse_extension(s, TLSEXT_IDX_supported_versions, SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO, extensions, NULL, 0)) { s->version = origv; return 0; } if (s->hello_retry_request != SSL_HRR_NONE && s->version != TLS1_3_VERSION) { s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_WRONG_SSL_VERSION); return 0; } switch (s->method->version) { default: if (s->version != s->method->version) { s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_WRONG_SSL_VERSION); return 0; } /* * If this SSL handle is not from a version flexible method we don't * (and never did) check min/max, FIPS or Suite B constraints. Hope * that's OK. It is up to the caller to not choose fixed protocol * versions they don't want. If not, then easy to fix, just return * ssl_method_error(s, s->method) */ return 1; case TLS_ANY_VERSION: table = tls_version_table; break; case DTLS_ANY_VERSION: table = dtls_version_table; break; } ret = ssl_get_min_max_version(s, &ver_min, &ver_max, &real_max); if (ret != 0) { s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, ret); return 0; } if (SSL_IS_DTLS(s) ? DTLS_VERSION_LT(s->version, ver_min) : s->version < ver_min) { s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_UNSUPPORTED_PROTOCOL); return 0; } else if (SSL_IS_DTLS(s) ? DTLS_VERSION_GT(s->version, ver_max) : s->version > ver_max) { s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_UNSUPPORTED_PROTOCOL); return 0; } if ((s->mode & SSL_MODE_SEND_FALLBACK_SCSV) == 0) real_max = ver_max; /* Check for downgrades */ if (s->version == TLS1_2_VERSION && real_max > s->version) { if (memcmp(tls12downgrade, s->s3->server_random + SSL3_RANDOM_SIZE - sizeof(tls12downgrade), sizeof(tls12downgrade)) == 0) { s->version = origv; SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_INAPPROPRIATE_FALLBACK); return 0; } } else if (!SSL_IS_DTLS(s) && s->version < TLS1_2_VERSION && real_max > s->version) { if (memcmp(tls11downgrade, s->s3->server_random + SSL3_RANDOM_SIZE - sizeof(tls11downgrade), sizeof(tls11downgrade)) == 0) { s->version = origv; SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_INAPPROPRIATE_FALLBACK); return 0; } } for (vent = table; vent->version != 0; ++vent) { if (vent->cmeth == NULL || s->version != vent->version) continue; s->method = vent->cmeth(); return 1; } s->version = origv; SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_SSL_CHOOSE_CLIENT_VERSION, SSL_R_UNSUPPORTED_PROTOCOL); return 0; } /* * ssl_get_min_max_version - get minimum and maximum protocol version * @s: The SSL connection * @min_version: The minimum supported version * @max_version: The maximum supported version * @real_max: The highest version below the lowest compile time version hole * where that hole lies above at least one run-time enabled * protocol. * * Work out what version we should be using for the initial ClientHello if the * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx * options, the MinProtocol and MaxProtocol configuration commands, any Suite B * constraints and any floor imposed by the security level here, * so we don't advertise the wrong protocol version to only reject the outcome later. * * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. * * Returns 0 on success or an SSL error reason number on failure. On failure * min_version and max_version will also be set to 0. */ int ssl_get_min_max_version(const SSL *s, int *min_version, int *max_version, int *real_max) { int version, tmp_real_max; int hole; const SSL_METHOD *single = NULL; const SSL_METHOD *method; const version_info *table; const version_info *vent; switch (s->method->version) { default: /* * If this SSL handle is not from a version flexible method we don't * (and never did) check min/max FIPS or Suite B constraints. Hope * that's OK. It is up to the caller to not choose fixed protocol * versions they don't want. If not, then easy to fix, just return * ssl_method_error(s, s->method) */ *min_version = *max_version = s->version; /* * Providing a real_max only makes sense where we're using a version * flexible method. */ if (!ossl_assert(real_max == NULL)) return ERR_R_INTERNAL_ERROR; return 0; case TLS_ANY_VERSION: table = tls_version_table; break; case DTLS_ANY_VERSION: table = dtls_version_table; break; } /* * SSL_OP_NO_X disables all protocols above X *if* there are some protocols * below X enabled. This is required in order to maintain the "version * capability" vector contiguous. Any versions with a NULL client method * (protocol version client is disabled at compile-time) is also a "hole". * * Our initial state is hole == 1, version == 0. That is, versions above * the first version in the method table are disabled (a "hole" above * the valid protocol entries) and we don't have a selected version yet. * * Whenever "hole == 1", and we hit an enabled method, its version becomes * the selected version, and the method becomes a candidate "single" * method. We're no longer in a hole, so "hole" becomes 0. * * If "hole == 0" and we hit an enabled method, then "single" is cleared, * as we support a contiguous range of at least two methods. If we hit * a disabled method, then hole becomes true again, but nothing else * changes yet, because all the remaining methods may be disabled too. * If we again hit an enabled method after the new hole, it becomes * selected, as we start from scratch. */ *min_version = version = 0; hole = 1; if (real_max != NULL) *real_max = 0; tmp_real_max = 0; for (vent = table; vent->version != 0; ++vent) { /* * A table entry with a NULL client method is still a hole in the * "version capability" vector. */ if (vent->cmeth == NULL) { hole = 1; tmp_real_max = 0; continue; } method = vent->cmeth(); if (hole == 1 && tmp_real_max == 0) tmp_real_max = vent->version; if (ssl_method_error(s, method) != 0) { hole = 1; } else if (!hole) { single = NULL; *min_version = method->version; } else { if (real_max != NULL && tmp_real_max != 0) *real_max = tmp_real_max; version = (single = method)->version; *min_version = version; hole = 0; } } *max_version = version; /* Fail if everything is disabled */ if (version == 0) return SSL_R_NO_PROTOCOLS_AVAILABLE; return 0; } /* * ssl_set_client_hello_version - Work out what version we should be using for * the initial ClientHello.legacy_version field. * * @s: client SSL handle. * * Returns 0 on success or an SSL error reason number on failure. */ int ssl_set_client_hello_version(SSL *s) { int ver_min, ver_max, ret; /* * In a renegotiation we always send the same client_version that we sent * last time, regardless of which version we eventually negotiated. */ if (!SSL_IS_FIRST_HANDSHAKE(s)) return 0; ret = ssl_get_min_max_version(s, &ver_min, &ver_max, NULL); if (ret != 0) return ret; s->version = ver_max; /* TLS1.3 always uses TLS1.2 in the legacy_version field */ if (!SSL_IS_DTLS(s) && ver_max > TLS1_2_VERSION) ver_max = TLS1_2_VERSION; s->client_version = ver_max; return 0; } /* * Checks a list of |groups| to determine if the |group_id| is in it. If it is * and |checkallow| is 1 then additionally check if the group is allowed to be * used. Returns 1 if the group is in the list (and allowed if |checkallow| is * 1) or 0 otherwise. */ #ifndef OPENSSL_NO_EC int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups, size_t num_groups, int checkallow) { size_t i; if (groups == NULL || num_groups == 0) return 0; for (i = 0; i < num_groups; i++) { uint16_t group = groups[i]; if (group_id == group && (!checkallow || tls_curve_allowed(s, group, SSL_SECOP_CURVE_CHECK))) { return 1; } } return 0; } #endif /* Replace ClientHello1 in the transcript hash with a synthetic message */ int create_synthetic_message_hash(SSL *s, const unsigned char *hashval, size_t hashlen, const unsigned char *hrr, size_t hrrlen) { unsigned char hashvaltmp[EVP_MAX_MD_SIZE]; unsigned char msghdr[SSL3_HM_HEADER_LENGTH]; memset(msghdr, 0, sizeof(msghdr)); if (hashval == NULL) { hashval = hashvaltmp; hashlen = 0; /* Get the hash of the initial ClientHello */ if (!ssl3_digest_cached_records(s, 0) || !ssl_handshake_hash(s, hashvaltmp, sizeof(hashvaltmp), &hashlen)) { /* SSLfatal() already called */ return 0; } } /* Reinitialise the transcript hash */ if (!ssl3_init_finished_mac(s)) { /* SSLfatal() already called */ return 0; } /* Inject the synthetic message_hash message */ msghdr[0] = SSL3_MT_MESSAGE_HASH; msghdr[SSL3_HM_HEADER_LENGTH - 1] = (unsigned char)hashlen; if (!ssl3_finish_mac(s, msghdr, SSL3_HM_HEADER_LENGTH) || !ssl3_finish_mac(s, hashval, hashlen)) { /* SSLfatal() already called */ return 0; } /* * Now re-inject the HRR and current message if appropriate (we just deleted * it when we reinitialised the transcript hash above). Only necessary after * receiving a ClientHello2 with a cookie. */ if (hrr != NULL && (!ssl3_finish_mac(s, hrr, hrrlen) || !ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->s3->tmp.message_size + SSL3_HM_HEADER_LENGTH))) { /* SSLfatal() already called */ return 0; } return 1; } static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b) { return X509_NAME_cmp(*a, *b); } int parse_ca_names(SSL *s, PACKET *pkt) { STACK_OF(X509_NAME) *ca_sk = sk_X509_NAME_new(ca_dn_cmp); X509_NAME *xn = NULL; PACKET cadns; if (ca_sk == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_PARSE_CA_NAMES, ERR_R_MALLOC_FAILURE); goto err; } /* get the CA RDNs */ if (!PACKET_get_length_prefixed_2(pkt, &cadns)) { SSLfatal(s, SSL_AD_DECODE_ERROR,SSL_F_PARSE_CA_NAMES, SSL_R_LENGTH_MISMATCH); goto err; } while (PACKET_remaining(&cadns)) { const unsigned char *namestart, *namebytes; unsigned int name_len; if (!PACKET_get_net_2(&cadns, &name_len) || !PACKET_get_bytes(&cadns, &namebytes, name_len)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_PARSE_CA_NAMES, SSL_R_LENGTH_MISMATCH); goto err; } namestart = namebytes; if ((xn = d2i_X509_NAME(NULL, &namebytes, name_len)) == NULL) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_PARSE_CA_NAMES, ERR_R_ASN1_LIB); goto err; } if (namebytes != (namestart + name_len)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_PARSE_CA_NAMES, SSL_R_CA_DN_LENGTH_MISMATCH); goto err; } if (!sk_X509_NAME_push(ca_sk, xn)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_PARSE_CA_NAMES, ERR_R_MALLOC_FAILURE); goto err; } xn = NULL; } sk_X509_NAME_pop_free(s->s3->tmp.peer_ca_names, X509_NAME_free); s->s3->tmp.peer_ca_names = ca_sk; return 1; err: sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); X509_NAME_free(xn); return 0; } const STACK_OF(X509_NAME) *get_ca_names(SSL *s) { const STACK_OF(X509_NAME) *ca_sk = NULL;; if (s->server) { ca_sk = SSL_get_client_CA_list(s); if (ca_sk != NULL && sk_X509_NAME_num(ca_sk) == 0) ca_sk = NULL; } if (ca_sk == NULL) ca_sk = SSL_get0_CA_list(s); return ca_sk; } int construct_ca_names(SSL *s, const STACK_OF(X509_NAME) *ca_sk, WPACKET *pkt) { /* Start sub-packet for client CA list */ if (!WPACKET_start_sub_packet_u16(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_CA_NAMES, ERR_R_INTERNAL_ERROR); return 0; } if (ca_sk != NULL) { int i; for (i = 0; i < sk_X509_NAME_num(ca_sk); i++) { unsigned char *namebytes; X509_NAME *name = sk_X509_NAME_value(ca_sk, i); int namelen; if (name == NULL || (namelen = i2d_X509_NAME(name, NULL)) < 0 || !WPACKET_sub_allocate_bytes_u16(pkt, namelen, &namebytes) || i2d_X509_NAME(name, &namebytes) != namelen) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_CA_NAMES, ERR_R_INTERNAL_ERROR); return 0; } } } if (!WPACKET_close(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_CA_NAMES, ERR_R_INTERNAL_ERROR); return 0; } return 1; } /* Create a buffer containing data to be signed for server key exchange */ size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs, const void *param, size_t paramlen) { size_t tbslen = 2 * SSL3_RANDOM_SIZE + paramlen; unsigned char *tbs = OPENSSL_malloc(tbslen); if (tbs == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_KEY_EXCHANGE_TBS, ERR_R_MALLOC_FAILURE); return 0; } memcpy(tbs, s->s3->client_random, SSL3_RANDOM_SIZE); memcpy(tbs + SSL3_RANDOM_SIZE, s->s3->server_random, SSL3_RANDOM_SIZE); memcpy(tbs + SSL3_RANDOM_SIZE * 2, param, paramlen); *ptbs = tbs; return tbslen; } /* * Saves the current handshake digest for Post-Handshake Auth, * Done after ClientFinished is processed, done exactly once */ int tls13_save_handshake_digest_for_pha(SSL *s) { if (s->pha_dgst == NULL) { if (!ssl3_digest_cached_records(s, 1)) /* SSLfatal() already called */ return 0; s->pha_dgst = EVP_MD_CTX_new(); if (s->pha_dgst == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SAVE_HANDSHAKE_DIGEST_FOR_PHA, ERR_R_INTERNAL_ERROR); return 0; } if (!EVP_MD_CTX_copy_ex(s->pha_dgst, s->s3->handshake_dgst)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SAVE_HANDSHAKE_DIGEST_FOR_PHA, ERR_R_INTERNAL_ERROR); return 0; } } return 1; } /* * Restores the Post-Handshake Auth handshake digest * Done just before sending/processing the Cert Request */ int tls13_restore_handshake_digest_for_pha(SSL *s) { if (s->pha_dgst == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_RESTORE_HANDSHAKE_DIGEST_FOR_PHA, ERR_R_INTERNAL_ERROR); return 0; } if (!EVP_MD_CTX_copy_ex(s->s3->handshake_dgst, s->pha_dgst)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_RESTORE_HANDSHAKE_DIGEST_FOR_PHA, ERR_R_INTERNAL_ERROR); return 0; } return 1; } #ifndef OPENSSL_NO_CERT_COMPRESSION int tls_construct_compressed_certificate(SSL *s, WPACKET *pkt, confunc_f confunc) { SSL_cert_compress_cb_fn compress_fn = NULL; unsigned char *compressed_msg = NULL; size_t compressed_size; size_t uncompressed_length; WPACKET inpkt; BUF_MEM *buf = NULL; int i; if ((buf = BUF_MEM_new()) == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_MALLOC_FAILURE); return 0; } if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } if (!WPACKET_init(&inpkt, buf)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } if (!confunc(s, &inpkt)) { WPACKET_cleanup(&inpkt); /* SSLfatal() already called */ goto err; } if (!WPACKET_get_length(&inpkt, &uncompressed_length) || !WPACKET_finish(&inpkt)) { WPACKET_cleanup(&inpkt); SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } for (i = 0; i < sk_CERT_COMP_num(s->cert_comp_algs); i++) { CERT_COMP *comp = sk_CERT_COMP_value(s->cert_comp_algs, i); if (comp->alg_id == s->cert_comp_compress_id && comp->compress) { compress_fn = comp->compress; break; } } if (compress_fn == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } /* get compressed_size */ if (!compress_fn(s, (const unsigned char *)buf->data, uncompressed_length, NULL, &compressed_size)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } compressed_msg = OPENSSL_malloc(compressed_size); if (compressed_msg == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } if (!compress_fn(s, (const unsigned char *)buf->data, uncompressed_length, compressed_msg, &compressed_size)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } if (!WPACKET_put_bytes_u16(pkt, s->cert_comp_compress_id) || !WPACKET_put_bytes_u24(pkt, uncompressed_length) || !WPACKET_sub_memcpy_u24(pkt, compressed_msg, compressed_size)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } BUF_MEM_free(buf); OPENSSL_free(compressed_msg); return 1; err: BUF_MEM_free(buf); if (compressed_msg != NULL) OPENSSL_free(compressed_msg); return 0; } MSG_PROCESS_RETURN tls_process_compressed_certificate(SSL *s, PACKET *pkt, profunc_f profunc) { SSL_cert_decompress_cb_fn decompress_fn = NULL; MSG_PROCESS_RETURN ret; unsigned char *out = NULL; unsigned int alg_id; size_t msg_len; unsigned long uncompressed_len; PACKET subpkt; int i; if (s->cert_comp_algs == NULL) { SSLfatal(s, SSL_AD_BAD_CERTIFICATE, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, SSL_R_BAD_PACKET); goto err; } if (!PACKET_get_net_2(pkt, &alg_id) || !PACKET_get_net_3(pkt, &uncompressed_len) || !PACKET_get_net_3_len(pkt, &msg_len) || !PACKET_get_sub_packet(pkt, &subpkt, msg_len) || PACKET_remaining(pkt) != 0) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, SSL_R_BAD_PACKET); goto err; } if (uncompressed_len > s->max_cert_list) { SSLfatal(s, SSL_AD_BAD_CERTIFICATE, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, SSL_R_LENGTH_TOO_LONG); goto err; } for (i = 0; i < sk_CERT_COMP_num(s->cert_comp_algs); i++) { CERT_COMP *comp = sk_CERT_COMP_value(s->cert_comp_algs, i); if ((comp->alg_id == alg_id) && comp->decompress) { decompress_fn = comp->decompress; break; } } if (decompress_fn == NULL) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, SSL_R_BAD_PACKET); goto err; } s->cert_comp_decompress_id = alg_id; out = OPENSSL_malloc(uncompressed_len); if (out == NULL) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } if (!decompress_fn(s, PACKET_data(&subpkt), msg_len, out, uncompressed_len)) { SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, SSL_R_BAD_PACKET); goto err; } if (!PACKET_buf_init(&subpkt, out, uncompressed_len)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_COMPRESSED_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto err; } ret = profunc(s, &subpkt); OPENSSL_free(out); return ret; err: if (out != NULL) OPENSSL_free(out); return MSG_PROCESS_ERROR; } #endif