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IABSD.fr/src/lib/libssl/ssl_srvr.c
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tb
Date : 2020-03-06 16:31:30
Hash : 34393826
Message : TLSv1.3 servers that intend to downgrade are required to set the last eight bytes of the server's random to a magic cookie (RFC 8446, 4.1.3). The TLSv1.3 spec changes the TLSv1.2 spec in that it recommends that TLSv1.2 servers that negotiate TLSv1.1 or below do the same. This gives a limited additional protection against downgrade attacks beyond what is already present in the Finished exchange. The TLSv1.3 part was already implemented in Hobart and can be trivially modified to do the TLSv1.2 bit as well. ok inoguchi, jsing
- lib/libssl/ssl_srvr.c
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/* $OpenBSD: ssl_srvr.c,v 1.73 2020/03/06 16:31:30 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * * Portions of the attached software ("Contribution") are developed by * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. * * The Contribution is licensed pursuant to the OpenSSL open source * license provided above. * * ECC cipher suite support in OpenSSL originally written by * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. * */ /* ==================================================================== * Copyright 2005 Nokia. All rights reserved. * * The portions of the attached software ("Contribution") is developed by * Nokia Corporation and is licensed pursuant to the OpenSSL open source * license. * * The Contribution, originally written by Mika Kousa and Pasi Eronen of * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites * support (see RFC 4279) to OpenSSL. * * No patent licenses or other rights except those expressly stated in * the OpenSSL open source license shall be deemed granted or received * expressly, by implication, estoppel, or otherwise. * * No assurances are provided by Nokia that the Contribution does not * infringe the patent or other intellectual property rights of any third * party or that the license provides you with all the necessary rights * to make use of the Contribution. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR * OTHERWISE. */ #include <stdio.h> #include "ssl_locl.h" #include <openssl/bn.h> #include <openssl/buffer.h> #include <openssl/curve25519.h> #include <openssl/evp.h> #include <openssl/dh.h> #ifndef OPENSSL_NO_GOST #include <openssl/gost.h> #endif #include <openssl/hmac.h> #include <openssl/md5.h> #include <openssl/objects.h> #include <openssl/x509.h> #include "bytestring.h" #include "ssl_sigalgs.h" #include "ssl_tlsext.h" int ssl3_accept(SSL *s) { void (*cb)(const SSL *ssl, int type, int val) = NULL; unsigned long alg_k; int ret = -1; int new_state, state, skip = 0; int listen = 0; ERR_clear_error(); errno = 0; if (s->internal->info_callback != NULL) cb = s->internal->info_callback; else if (s->ctx->internal->info_callback != NULL) cb = s->ctx->internal->info_callback; if (SSL_IS_DTLS(s)) listen = D1I(s)->listen; /* init things to blank */ s->internal->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); if (SSL_IS_DTLS(s)) D1I(s)->listen = listen; for (;;) { state = S3I(s)->hs.state; switch (S3I(s)->hs.state) { case SSL_ST_RENEGOTIATE: s->internal->renegotiate = 1; /* S3I(s)->hs.state=SSL_ST_ACCEPT; */ case SSL_ST_BEFORE: case SSL_ST_ACCEPT: case SSL_ST_BEFORE|SSL_ST_ACCEPT: case SSL_ST_OK|SSL_ST_ACCEPT: s->server = 1; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_START, 1); if (SSL_IS_DTLS(s)) { if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { SSLerror(s, ERR_R_INTERNAL_ERROR); ret = -1; goto end; } } else { if ((s->version >> 8) != 3) { SSLerror(s, ERR_R_INTERNAL_ERROR); ret = -1; goto end; } } s->internal->type = SSL_ST_ACCEPT; if (!ssl3_setup_init_buffer(s)) { ret = -1; goto end; } if (!ssl3_setup_buffers(s)) { ret = -1; goto end; } s->internal->init_num = 0; if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { /* * Ok, we now need to push on a buffering BIO * so that the output is sent in a way that * TCP likes :-) */ if (!ssl_init_wbio_buffer(s, 1)) { ret = -1; goto end; } if (!tls1_transcript_init(s)) { ret = -1; goto end; } S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; s->ctx->internal->stats.sess_accept++; } else if (!SSL_IS_DTLS(s) && !S3I(s)->send_connection_binding) { /* * Server attempting to renegotiate with * client that doesn't support secure * renegotiation. */ SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); ret = -1; goto end; } else { /* * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, * we will just send a HelloRequest. */ s->ctx->internal->stats.sess_accept_renegotiate++; S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; } break; case SSL3_ST_SW_HELLO_REQ_A: case SSL3_ST_SW_HELLO_REQ_B: s->internal->shutdown = 0; if (SSL_IS_DTLS(s)) { dtls1_clear_record_buffer(s); dtls1_start_timer(s); } ret = ssl3_send_hello_request(s); if (ret <= 0) goto end; if (SSL_IS_DTLS(s)) S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; else S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C; S3I(s)->hs.state = SSL3_ST_SW_FLUSH; s->internal->init_num = 0; if (!tls1_transcript_init(s)) { ret = -1; goto end; } break; case SSL3_ST_SW_HELLO_REQ_C: S3I(s)->hs.state = SSL_ST_OK; break; case SSL3_ST_SR_CLNT_HELLO_A: case SSL3_ST_SR_CLNT_HELLO_B: case SSL3_ST_SR_CLNT_HELLO_C: s->internal->shutdown = 0; if (SSL_IS_DTLS(s)) { ret = ssl3_get_client_hello(s); if (ret <= 0) goto end; dtls1_stop_timer(s); if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; else S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; s->internal->init_num = 0; /* * Reflect ClientHello sequence to remain * stateless while listening. */ if (listen) { memcpy(S3I(s)->write_sequence, S3I(s)->read_sequence, sizeof(S3I(s)->write_sequence)); } /* If we're just listening, stop here */ if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { ret = 2; D1I(s)->listen = 0; /* * Set expected sequence numbers to * continue the handshake. */ D1I(s)->handshake_read_seq = 2; D1I(s)->handshake_write_seq = 1; D1I(s)->next_handshake_write_seq = 1; goto end; } } else { if (s->internal->rwstate != SSL_X509_LOOKUP) { ret = ssl3_get_client_hello(s); if (ret <= 0) goto end; } s->internal->renegotiate = 2; S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; s->internal->init_num = 0; } break; case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: ret = dtls1_send_hello_verify_request(s); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_FLUSH; S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; /* HelloVerifyRequest resets Finished MAC. */ tls1_transcript_reset(s); break; case SSL3_ST_SW_SRVR_HELLO_A: case SSL3_ST_SW_SRVR_HELLO_B: if (SSL_IS_DTLS(s)) { s->internal->renegotiate = 2; dtls1_start_timer(s); } ret = ssl3_send_server_hello(s); if (ret <= 0) goto end; if (s->internal->hit) { if (s->internal->tlsext_ticket_expected) S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; else S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; } else { S3I(s)->hs.state = SSL3_ST_SW_CERT_A; } s->internal->init_num = 0; break; case SSL3_ST_SW_CERT_A: case SSL3_ST_SW_CERT_B: /* Check if it is anon DH or anon ECDH. */ if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { if (SSL_IS_DTLS(s)) dtls1_start_timer(s); ret = ssl3_send_server_certificate(s); if (ret <= 0) goto end; if (s->internal->tlsext_status_expected) S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; else S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; } else { skip = 1; S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; } s->internal->init_num = 0; break; case SSL3_ST_SW_KEY_EXCH_A: case SSL3_ST_SW_KEY_EXCH_B: alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; /* * Only send if using a DH key exchange. * * For ECC ciphersuites, we send a ServerKeyExchange * message only if the cipher suite is ECDHE. In other * cases, the server certificate contains the server's * public key for key exchange. */ if (alg_k & (SSL_kDHE|SSL_kECDHE)) { if (SSL_IS_DTLS(s)) dtls1_start_timer(s); ret = ssl3_send_server_key_exchange(s); if (ret <= 0) goto end; } else skip = 1; S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; s->internal->init_num = 0; break; case SSL3_ST_SW_CERT_REQ_A: case SSL3_ST_SW_CERT_REQ_B: /* * Determine whether or not we need to request a * certificate. * * Do not request a certificate if: * * - We did not ask for it (SSL_VERIFY_PEER is unset). * * - SSL_VERIFY_CLIENT_ONCE is set and we are * renegotiating. * * - We are using an anonymous ciphersuites * (see section "Certificate request" in SSL 3 drafts * and in RFC 2246) ... except when the application * insists on verification (against the specs, but * s3_clnt.c accepts this for SSL 3). */ if (!(s->verify_mode & SSL_VERIFY_PEER) || ((s->session->peer != NULL) && (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || ((S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) && !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { /* No cert request. */ skip = 1; S3I(s)->tmp.cert_request = 0; S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; if (!SSL_IS_DTLS(s)) tls1_transcript_free(s); } else { S3I(s)->tmp.cert_request = 1; if (SSL_IS_DTLS(s)) dtls1_start_timer(s); ret = ssl3_send_certificate_request(s); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; s->internal->init_num = 0; } break; case SSL3_ST_SW_SRVR_DONE_A: case SSL3_ST_SW_SRVR_DONE_B: if (SSL_IS_DTLS(s)) dtls1_start_timer(s); ret = ssl3_send_server_done(s); if (ret <= 0) goto end; S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A; S3I(s)->hs.state = SSL3_ST_SW_FLUSH; s->internal->init_num = 0; break; case SSL3_ST_SW_FLUSH: /* * This code originally checked to see if * any data was pending using BIO_CTRL_INFO * and then flushed. This caused problems * as documented in PR#1939. The proposed * fix doesn't completely resolve this issue * as buggy implementations of BIO_CTRL_PENDING * still exist. So instead we just flush * unconditionally. */ s->internal->rwstate = SSL_WRITING; if (BIO_flush(s->wbio) <= 0) { if (SSL_IS_DTLS(s)) { /* If the write error was fatal, stop trying. */ if (!BIO_should_retry(s->wbio)) { s->internal->rwstate = SSL_NOTHING; S3I(s)->hs.state = S3I(s)->hs.next_state; } } ret = -1; goto end; } s->internal->rwstate = SSL_NOTHING; S3I(s)->hs.state = S3I(s)->hs.next_state; break; case SSL3_ST_SR_CERT_A: case SSL3_ST_SR_CERT_B: if (S3I(s)->tmp.cert_request) { ret = ssl3_get_client_certificate(s); if (ret <= 0) goto end; } s->internal->init_num = 0; S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; break; case SSL3_ST_SR_KEY_EXCH_A: case SSL3_ST_SR_KEY_EXCH_B: ret = ssl3_get_client_key_exchange(s); if (ret <= 0) goto end; if (SSL_IS_DTLS(s)) { S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; s->internal->init_num = 0; } alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; if (ret == 2) { /* * For the ECDH ciphersuites when * the client sends its ECDH pub key in * a certificate, the CertificateVerify * message is not sent. * Also for GOST ciphersuites when * the client uses its key from the certificate * for key exchange. */ S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; s->internal->init_num = 0; } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; s->internal->init_num = 0; if (!s->session->peer) break; /* * Freeze the transcript for use during client * certificate verification. */ tls1_transcript_freeze(s); } else { S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; s->internal->init_num = 0; tls1_transcript_free(s); /* * We need to get hashes here so if there is * a client cert, it can be verified. */ if (!tls1_transcript_hash_value(s, S3I(s)->tmp.cert_verify_md, sizeof(S3I(s)->tmp.cert_verify_md), NULL)) { ret = -1; goto end; } } break; case SSL3_ST_SR_CERT_VRFY_A: case SSL3_ST_SR_CERT_VRFY_B: if (SSL_IS_DTLS(s)) D1I(s)->change_cipher_spec_ok = 1; else s->s3->flags |= SSL3_FLAGS_CCS_OK; /* we should decide if we expected this one */ ret = ssl3_get_cert_verify(s); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; s->internal->init_num = 0; break; case SSL3_ST_SR_FINISHED_A: case SSL3_ST_SR_FINISHED_B: if (SSL_IS_DTLS(s)) D1I(s)->change_cipher_spec_ok = 1; else s->s3->flags |= SSL3_FLAGS_CCS_OK; ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B); if (ret <= 0) goto end; if (SSL_IS_DTLS(s)) dtls1_stop_timer(s); if (s->internal->hit) S3I(s)->hs.state = SSL_ST_OK; else if (s->internal->tlsext_ticket_expected) S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; else S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; s->internal->init_num = 0; break; case SSL3_ST_SW_SESSION_TICKET_A: case SSL3_ST_SW_SESSION_TICKET_B: ret = ssl3_send_newsession_ticket(s); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; s->internal->init_num = 0; break; case SSL3_ST_SW_CERT_STATUS_A: case SSL3_ST_SW_CERT_STATUS_B: ret = ssl3_send_cert_status(s); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; s->internal->init_num = 0; break; case SSL3_ST_SW_CHANGE_A: case SSL3_ST_SW_CHANGE_B: s->session->cipher = S3I(s)->hs.new_cipher; if (!tls1_setup_key_block(s)) { ret = -1; goto end; } ret = ssl3_send_change_cipher_spec(s, SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; s->internal->init_num = 0; if (!tls1_change_cipher_state(s, SSL3_CHANGE_CIPHER_SERVER_WRITE)) { ret = -1; goto end; } if (SSL_IS_DTLS(s)) dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); break; case SSL3_ST_SW_FINISHED_A: case SSL3_ST_SW_FINISHED_B: ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B, TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE); if (ret <= 0) goto end; S3I(s)->hs.state = SSL3_ST_SW_FLUSH; if (s->internal->hit) { S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A; tls1_transcript_free(s); } else S3I(s)->hs.next_state = SSL_ST_OK; s->internal->init_num = 0; break; case SSL_ST_OK: /* clean a few things up */ tls1_cleanup_key_block(s); if (S3I(s)->handshake_transcript != NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); ret = -1; goto end; } if (!SSL_IS_DTLS(s)) { BUF_MEM_free(s->internal->init_buf); s->internal->init_buf = NULL; } /* remove buffering on output */ ssl_free_wbio_buffer(s); s->internal->init_num = 0; /* Skipped if we just sent a HelloRequest. */ if (s->internal->renegotiate == 2) { s->internal->renegotiate = 0; s->internal->new_session = 0; ssl_update_cache(s, SSL_SESS_CACHE_SERVER); s->ctx->internal->stats.sess_accept_good++; /* s->server=1; */ s->internal->handshake_func = ssl3_accept; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_DONE, 1); } ret = 1; if (SSL_IS_DTLS(s)) { /* Done handshaking, next message is client hello. */ D1I(s)->handshake_read_seq = 0; /* Next message is server hello. */ D1I(s)->handshake_write_seq = 0; D1I(s)->next_handshake_write_seq = 0; } goto end; /* break; */ default: SSLerror(s, SSL_R_UNKNOWN_STATE); ret = -1; goto end; /* break; */ } if (!S3I(s)->tmp.reuse_message && !skip) { if (s->internal->debug) { if ((ret = BIO_flush(s->wbio)) <= 0) goto end; } if ((cb != NULL) && (S3I(s)->hs.state != state)) { new_state = S3I(s)->hs.state; S3I(s)->hs.state = state; cb(s, SSL_CB_ACCEPT_LOOP, 1); S3I(s)->hs.state = new_state; } } skip = 0; } end: /* BIO_flush(s->wbio); */ s->internal->in_handshake--; if (cb != NULL) cb(s, SSL_CB_ACCEPT_EXIT, ret); return (ret); } int ssl3_send_hello_request(SSL *s) { CBB cbb, hello; memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { if (!ssl3_handshake_msg_start(s, &cbb, &hello, SSL3_MT_HELLO_REQUEST)) goto err; if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; } /* SSL3_ST_SW_HELLO_REQ_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (-1); } int ssl3_get_client_hello(SSL *s) { CBS cbs, client_random, session_id, cookie, cipher_suites; CBS compression_methods; uint16_t client_version; uint8_t comp_method; int comp_null; int i, j, ok, al, ret = -1, cookie_valid = 0; long n; unsigned long id; SSL_CIPHER *c; STACK_OF(SSL_CIPHER) *ciphers = NULL; unsigned long alg_k; const SSL_METHOD *method; uint16_t max_version, shared_version; /* * We do this so that we will respond with our native type. * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, * This down switching should be handled by a different method. * If we are SSLv3, we will respond with SSLv3, even if prompted with * TLSv1. */ if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; } s->internal->first_packet = 1; n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, SSL3_RT_MAX_PLAIN_LENGTH, &ok); if (!ok) return ((int)n); s->internal->first_packet = 0; if (n < 0) goto err; CBS_init(&cbs, s->internal->init_msg, n); /* Parse client hello up until the extensions (if any). */ if (!CBS_get_u16(&cbs, &client_version)) goto truncated; if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) goto truncated; if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) goto truncated; if (SSL_IS_DTLS(s)) { if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) goto truncated; } if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) goto truncated; if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) goto truncated; /* * Use version from inside client hello, not from record header. * (may differ: see RFC 2246, Appendix E, second paragraph) */ if (ssl_max_shared_version(s, client_version, &shared_version) != 1) { SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && !s->internal->enc_write_ctx && !s->internal->write_hash) { /* * Similar to ssl3_get_record, send alert using remote * version number. */ s->version = s->client_version; } al = SSL_AD_PROTOCOL_VERSION; goto f_err; } s->client_version = client_version; s->version = shared_version; if ((method = tls1_get_server_method(shared_version)) == NULL) method = dtls1_get_server_method(shared_version); if (method == NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } s->method = method; /* * If we require cookies (DTLS) and this ClientHello does not contain * one, just return since we do not want to allocate any memory yet. * So check cookie length... */ if (SSL_IS_DTLS(s)) { if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { if (CBS_len(&cookie) == 0) return (1); } } if (!CBS_write_bytes(&client_random, s->s3->client_random, sizeof(s->s3->client_random), NULL)) goto err; s->internal->hit = 0; /* * Versions before 0.9.7 always allow clients to resume sessions in * renegotiation. 0.9.7 and later allow this by default, but optionally * ignore resumption requests with flag * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag * rather than a change to default behavior so that applications * relying on this for security won't even compile against older * library versions). * * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() * to request renegotiation but not a new session (s->internal->new_session * remains unset): for servers, this essentially just means that the * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be * ignored. */ if ((s->internal->new_session && (s->internal->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { if (!ssl_get_new_session(s, 1)) goto err; } else { CBS ext_block; CBS_dup(&cbs, &ext_block); i = ssl_get_prev_session(s, &session_id, &ext_block); if (i == 1) { /* previous session */ s->internal->hit = 1; } else if (i == -1) goto err; else { /* i == 0 */ if (!ssl_get_new_session(s, 1)) goto err; } } if (SSL_IS_DTLS(s)) { /* * The ClientHello may contain a cookie even if the HelloVerify * message has not been sent - make sure that it does not cause * an overflow. */ if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_COOKIE_MISMATCH); goto f_err; } /* Verify the cookie if appropriate option is set. */ if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && CBS_len(&cookie) > 0) { size_t cookie_len; /* XXX - rcvd_cookie seems to only be used here... */ if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, sizeof(D1I(s)->rcvd_cookie), &cookie_len)) goto err; if (s->ctx->internal->app_verify_cookie_cb != NULL) { if (s->ctx->internal->app_verify_cookie_cb(s, D1I(s)->rcvd_cookie, cookie_len) == 0) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_COOKIE_MISMATCH); goto f_err; } /* else cookie verification succeeded */ /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, D1I(s)->cookie, D1I(s)->cookie_len) != 0) { /* default verification */ al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_COOKIE_MISMATCH); goto f_err; } cookie_valid = 1; } } /* XXX - This logic seems wrong... */ if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { /* we need a cipher if we are not resuming a session */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); goto f_err; } if (CBS_len(&cipher_suites) > 0) { if ((ciphers = ssl_bytes_to_cipher_list(s, &cipher_suites)) == NULL) goto err; } /* If it is a hit, check that the cipher is in the list */ /* XXX - CBS_len(&cipher_suites) will always be zero here... */ if (s->internal->hit && CBS_len(&cipher_suites) > 0) { j = 0; id = s->session->cipher->id; for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { c = sk_SSL_CIPHER_value(ciphers, i); if (c->id == id) { j = 1; break; } } if (j == 0) { /* * We need to have the cipher in the cipher * list if we are asked to reuse it */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); goto f_err; } } comp_null = 0; while (CBS_len(&compression_methods) > 0) { if (!CBS_get_u8(&compression_methods, &comp_method)) goto truncated; if (comp_method == 0) comp_null = 1; } if (comp_null == 0) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); goto f_err; } if (!tlsext_server_parse(s, &cbs, &al, SSL_TLSEXT_MSG_CH)) { SSLerror(s, SSL_R_PARSE_TLSEXT); goto f_err; } if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); goto f_err; } if (ssl_check_clienthello_tlsext_early(s) <= 0) { SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); goto err; } /* * Check if we want to use external pre-shared secret for this * handshake for not reused session only. We need to generate * server_random before calling tls_session_secret_cb in order to allow * SessionTicket processing to use it in key derivation. */ arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); if (!SSL_IS_DTLS(s) && !ssl_enabled_version_range(s, NULL, &max_version)) goto err; if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION && s->version < max_version) { /* * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 * we must set the last 8 bytes of the server random to magical * values to indicate we meant to downgrade. For TLS 1.2 it is * recommended that we do the same. */ size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); uint8_t *magic = &s->s3->server_random[index]; if (s->version == TLS1_2_VERSION) { /* Indicate we chose to downgrade to 1.2. */ memcpy(magic, tls13_downgrade_12, sizeof(tls13_downgrade_12)); } else { /* Indicate we chose to downgrade to 1.1 or lower */ memcpy(magic, tls13_downgrade_11, sizeof(tls13_downgrade_11)); } } if (!s->internal->hit && s->internal->tls_session_secret_cb) { SSL_CIPHER *pref_cipher = NULL; s->session->master_key_length = sizeof(s->session->master_key); if (s->internal->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length, ciphers, &pref_cipher, s->internal->tls_session_secret_cb_arg)) { s->internal->hit = 1; s->session->ciphers = ciphers; s->session->verify_result = X509_V_OK; ciphers = NULL; /* check if some cipher was preferred by call back */ pref_cipher = pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); if (pref_cipher == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_NO_SHARED_CIPHER); goto f_err; } s->session->cipher = pref_cipher; sk_SSL_CIPHER_free(s->cipher_list); sk_SSL_CIPHER_free(s->internal->cipher_list_by_id); s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); s->internal->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); } } /* * Given s->session->ciphers and SSL_get_ciphers, we must * pick a cipher */ if (!s->internal->hit) { sk_SSL_CIPHER_free(s->session->ciphers); s->session->ciphers = ciphers; if (ciphers == NULL) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerror(s, SSL_R_NO_CIPHERS_PASSED); goto f_err; } ciphers = NULL; c = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); if (c == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_NO_SHARED_CIPHER); goto f_err; } S3I(s)->hs.new_cipher = c; } else { S3I(s)->hs.new_cipher = s->session->cipher; } if (!tls1_transcript_hash_init(s)) goto err; alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || !(s->verify_mode & SSL_VERIFY_PEER)) tls1_transcript_free(s); /* * We now have the following setup. * client_random * cipher_list - our prefered list of ciphers * ciphers - the clients prefered list of ciphers * compression - basically ignored right now * ssl version is set - sslv3 * s->session - The ssl session has been setup. * s->internal->hit - session reuse flag * s->hs.new_cipher - the new cipher to use. */ /* Handles TLS extensions that we couldn't check earlier */ if (ssl_check_clienthello_tlsext_late(s) <= 0) { SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); goto err; } ret = cookie_valid ? 2 : 1; if (0) { truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); } err: sk_SSL_CIPHER_free(ciphers); return (ret); } int ssl3_send_server_hello(SSL *s) { CBB cbb, server_hello, session_id; size_t sl; memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, SSL3_MT_SERVER_HELLO)) goto err; if (!CBB_add_u16(&server_hello, s->version)) goto err; if (!CBB_add_bytes(&server_hello, s->s3->server_random, sizeof(s->s3->server_random))) goto err; /* * There are several cases for the session ID to send * back in the server hello: * * - For session reuse from the session cache, * we send back the old session ID. * - If stateless session reuse (using a session ticket) * is successful, we send back the client's "session ID" * (which doesn't actually identify the session). * - If it is a new session, we send back the new * session ID. * - However, if we want the new session to be single-use, * we send back a 0-length session ID. * * s->internal->hit is non-zero in either case of session reuse, * so the following won't overwrite an ID that we're supposed * to send back. */ if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) && !s->internal->hit) s->session->session_id_length = 0; sl = s->session->session_id_length; if (sl > sizeof(s->session->session_id)) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) goto err; if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) goto err; /* Cipher suite. */ if (!CBB_add_u16(&server_hello, ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) goto err; /* Compression method (null). */ if (!CBB_add_u8(&server_hello, 0)) goto err; /* TLS extensions */ if (!tlsext_server_build(s, &server_hello, SSL_TLSEXT_MSG_SH)) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; } /* SSL3_ST_SW_SRVR_HELLO_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (-1); } int ssl3_send_server_done(SSL *s) { CBB cbb, done; memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { if (!ssl3_handshake_msg_start(s, &cbb, &done, SSL3_MT_SERVER_DONE)) goto err; if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; } /* SSL3_ST_SW_SRVR_DONE_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (-1); } static int ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) { CBB dh_p, dh_g, dh_Ys; DH *dh = NULL, *dhp; unsigned char *data; int al; if (s->cert->dh_tmp_auto != 0) { if ((dhp = ssl_get_auto_dh(s)) == NULL) { al = SSL_AD_INTERNAL_ERROR; SSLerror(s, ERR_R_INTERNAL_ERROR); goto f_err; } } else dhp = s->cert->dh_tmp; if (dhp == NULL && s->cert->dh_tmp_cb != NULL) dhp = s->cert->dh_tmp_cb(s, 0, SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); if (dhp == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); goto f_err; } if (S3I(s)->tmp.dh != NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } if (s->cert->dh_tmp_auto != 0) { dh = dhp; } else if ((dh = DHparams_dup(dhp)) == NULL) { SSLerror(s, ERR_R_DH_LIB); goto err; } S3I(s)->tmp.dh = dh; if (!DH_generate_key(dh)) { SSLerror(s, ERR_R_DH_LIB); goto err; } /* * Serialize the DH parameters and public key. */ if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) goto err; if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) goto err; BN_bn2bin(dh->p, data); if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) goto err; if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) goto err; BN_bn2bin(dh->g, data); if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) goto err; if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) goto err; BN_bn2bin(dh->pub_key, data); if (!CBB_flush(cbb)) goto err; return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (-1); } static int ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) { int curve_id = 0; EC_KEY *ecdh; CBB ecpoint; int al; /* * Only named curves are supported in ECDH ephemeral key exchanges. * For supported named curves, curve_id is non-zero. */ if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); goto err; } if (S3I(s)->tmp.ecdh != NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); goto f_err; } S3I(s)->tmp.ecdh_nid = nid; ecdh = S3I(s)->tmp.ecdh; if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) goto err; /* * Encode the public key. * * Only named curves are supported in ECDH ephemeral key exchanges. * In this case the ServerKeyExchange message has: * [1 byte CurveType], [2 byte CurveName] * [1 byte length of encoded point], followed by * the actual encoded point itself. */ if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) goto err; if (!CBB_add_u16(cbb, curve_id)) goto err; if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) goto err; if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) goto err; if (!CBB_flush(cbb)) goto err; return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (-1); } static int ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) { uint8_t *public_key = NULL, *private_key = NULL; int curve_id; CBB ecpoint; int ret = -1; /* Generate an X25519 key pair. */ if (S3I(s)->tmp.x25519 != NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) goto err; if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) goto err; X25519_keypair(public_key, private_key); /* Serialize public key. */ if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); goto err; } if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) goto err; if (!CBB_add_u16(cbb, curve_id)) goto err; if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) goto err; if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) goto err; if (!CBB_flush(cbb)) goto err; S3I(s)->tmp.x25519 = private_key; private_key = NULL; ret = 1; err: free(public_key); freezero(private_key, X25519_KEY_LENGTH); return (ret); } static int ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) { int nid; nid = tls1_get_shared_curve(s); if (nid == NID_X25519) return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); } int ssl3_send_server_key_exchange(SSL *s) { CBB cbb, cbb_params, cbb_signature, server_kex; const struct ssl_sigalg *sigalg = NULL; unsigned char *signature = NULL; size_t signature_len = 0; unsigned char *params = NULL; size_t params_len; const EVP_MD *md = NULL; unsigned long type; EVP_MD_CTX md_ctx; EVP_PKEY_CTX *pctx; EVP_PKEY *pkey; int al; memset(&cbb, 0, sizeof(cbb)); memset(&cbb_params, 0, sizeof(cbb_params)); EVP_MD_CTX_init(&md_ctx); if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, SSL3_MT_SERVER_KEY_EXCHANGE)) goto err; if (!CBB_init(&cbb_params, 0)) goto err; type = S3I(s)->hs.new_cipher->algorithm_mkey; if (type & SSL_kDHE) { if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) goto err; } else if (type & SSL_kECDHE) { if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) goto err; } else { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); goto f_err; } if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) goto err; if (!CBB_add_bytes(&server_kex, params, params_len)) goto err; /* Add signature unless anonymous. */ if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher, &md, &sigalg)) == NULL) { al = SSL_AD_DECODE_ERROR; goto f_err; } /* Send signature algorithm. */ if (SSL_USE_SIGALGS(s)) { if (!CBB_add_u16(&server_kex, sigalg->value)) { al = SSL_AD_INTERNAL_ERROR; SSLerror(s, ERR_R_INTERNAL_ERROR); goto f_err; } } if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, SSL3_RANDOM_SIZE)) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, SSL3_RANDOM_SIZE)) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || !signature_len) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if ((signature = calloc(1, signature_len)) == NULL) { SSLerror(s, ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { SSLerror(s, ERR_R_EVP_LIB); goto err; } if (!CBB_add_u16_length_prefixed(&server_kex, &cbb_signature)) goto err; if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) goto err; } if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; } EVP_MD_CTX_cleanup(&md_ctx); free(params); free(signature); return (ssl3_handshake_write(s)); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: CBB_cleanup(&cbb_params); CBB_cleanup(&cbb); EVP_MD_CTX_cleanup(&md_ctx); free(params); free(signature); return (-1); } int ssl3_send_certificate_request(SSL *s) { CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; STACK_OF(X509_NAME) *sk = NULL; X509_NAME *name; int i; /* * Certificate Request - RFC 5246 section 7.4.4. */ memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, SSL3_MT_CERTIFICATE_REQUEST)) goto err; if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) goto err; if (!ssl3_get_req_cert_types(s, &cert_types)) goto err; if (SSL_USE_SIGALGS(s)) { if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) goto err; if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) goto err; } if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) goto err; sk = SSL_get_client_CA_list(s); for (i = 0; i < sk_X509_NAME_num(sk); i++) { unsigned char *name_data; size_t name_len; name = sk_X509_NAME_value(sk, i); name_len = i2d_X509_NAME(name, NULL); if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) goto err; if (!CBB_add_space(&dn, &name_data, name_len)) goto err; if (i2d_X509_NAME(name, &name_data) != name_len) goto err; } if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; } /* SSL3_ST_SW_CERT_REQ_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (-1); } static int ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) { unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; unsigned char *pms = NULL; unsigned char *p; size_t pms_len = 0; EVP_PKEY *pkey = NULL; RSA *rsa = NULL; CBS enc_pms; int decrypt_len; int al = -1; arc4random_buf(fakekey, sizeof(fakekey)); fakekey[0] = s->client_version >> 8; fakekey[1] = s->client_version & 0xff; pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); goto f_err; } rsa = pkey->pkey.rsa; pms_len = RSA_size(rsa); if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) goto err; if ((pms = malloc(pms_len)) == NULL) goto err; p = pms; if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) goto truncated; if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); goto err; } decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), pms, rsa, RSA_PKCS1_PADDING); ERR_clear_error(); if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { al = SSL_AD_DECODE_ERROR; /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ } if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && (pms[1] == (s->client_version & 0xff)))) { /* * The premaster secret must contain the same version number * as the ClientHello to detect version rollback attacks * (strangely, the protocol does not offer such protection for * DH ciphersuites). * * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack * (http://eprint.iacr.org/2003/052/) exploits the version * number check as a "bad version oracle" -- an alert would * reveal that the plaintext corresponding to some ciphertext * made up by the adversary is properly formatted except that * the version number is wrong. To avoid such attacks, we should * treat this just like any other decryption error. */ al = SSL_AD_DECODE_ERROR; /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ } if (al != -1) { /* * Some decryption failure -- use random value instead * as countermeasure against Bleichenbacher's attack * on PKCS #1 v1.5 RSA padding (see RFC 2246, * section 7.4.7.1). */ p = fakekey; } s->session->master_key_length = tls1_generate_master_secret(s, s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); freezero(pms, pms_len); return (1); truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: freezero(pms, pms_len); return (-1); } static int ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) { int key_size = 0, key_len, al; unsigned char *key = NULL; BIGNUM *bn = NULL; CBS dh_Yc; DH *dh; if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) goto truncated; if (CBS_len(cbs) != 0) goto truncated; if (S3I(s)->tmp.dh == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); goto f_err; } dh = S3I(s)->tmp.dh; if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { SSLerror(s, SSL_R_BN_LIB); goto err; } if ((key_size = DH_size(dh)) <= 0) { SSLerror(s, ERR_R_DH_LIB); goto err; } if ((key = malloc(key_size)) == NULL) { SSLerror(s, ERR_R_MALLOC_FAILURE); goto err; } if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { SSLerror(s, ERR_R_DH_LIB); goto err; } s->session->master_key_length = tls1_generate_master_secret(s, s->session->master_key, key, key_len); DH_free(S3I(s)->tmp.dh); S3I(s)->tmp.dh = NULL; freezero(key, key_size); BN_clear_free(bn); return (1); truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: freezero(key, key_size); BN_clear_free(bn); return (-1); } static int ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) { uint8_t *key = NULL; size_t key_len = 0; EC_KEY *ecdh_peer = NULL; EC_KEY *ecdh; CBS public; int ret = -1; /* * Use the ephemeral values we saved when generating the * ServerKeyExchange message. */ if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); goto err; } /* * Get client's public key from encoded point in the ClientKeyExchange * message. */ if (!CBS_get_u8_length_prefixed(cbs, &public)) goto err; if (CBS_len(cbs) != 0) goto err; if ((ecdh_peer = EC_KEY_new()) == NULL) goto err; if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, &public)) goto err; /* Derive the shared secret and compute master secret. */ if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) goto err; s->session->master_key_length = tls1_generate_master_secret(s, s->session->master_key, key, key_len); EC_KEY_free(S3I(s)->tmp.ecdh); S3I(s)->tmp.ecdh = NULL; S3I(s)->tmp.ecdh_nid = NID_undef; ret = 1; err: freezero(key, key_len); EC_KEY_free(ecdh_peer); return (ret); } static int ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) { uint8_t *shared_key = NULL; CBS ecpoint; int ret = -1; if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) goto err; if (CBS_len(cbs) != 0) goto err; if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) goto err; if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) goto err; if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) goto err; freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); S3I(s)->tmp.x25519 = NULL; s->session->master_key_length = tls1_generate_master_secret( s, s->session->master_key, shared_key, X25519_KEY_LENGTH); ret = 1; err: freezero(shared_key, X25519_KEY_LENGTH); return (ret); } static int ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) { if (S3I(s)->tmp.x25519 != NULL) return ssl3_get_client_kex_ecdhe_ecx(s, cbs); return ssl3_get_client_kex_ecdhe_ecp(s, cbs); } static int ssl3_get_client_kex_gost(SSL *s, CBS *cbs) { EVP_PKEY_CTX *pkey_ctx; EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; unsigned char premaster_secret[32]; unsigned long alg_a; size_t outlen = 32; CBS gostblob; int al; int ret = 0; /* Get our certificate private key*/ alg_a = S3I(s)->hs.new_cipher->algorithm_auth; if (alg_a & SSL_aGOST01) pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) goto err; if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) goto gerr; /* * If client certificate is present and is of the same type, * maybe use it for key exchange. * Don't mind errors from EVP_PKEY_derive_set_peer, because * it is completely valid to use a client certificate for * authorization only. */ if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) ERR_clear_error(); } /* Decrypt session key */ if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) goto truncated; if (CBS_len(cbs) != 0) goto truncated; if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { SSLerror(s, SSL_R_DECRYPTION_FAILED); goto gerr; } /* Generate master secret */ s->session->master_key_length = tls1_generate_master_secret( s, s->session->master_key, premaster_secret, 32); /* Check if pubkey from client certificate was used */ if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) ret = 2; else ret = 1; gerr: EVP_PKEY_free(client_pub_pkey); EVP_PKEY_CTX_free(pkey_ctx); if (ret) return (ret); else goto err; truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (-1); } int ssl3_get_client_key_exchange(SSL *s) { unsigned long alg_k; int al, ok; CBS cbs; long n; /* 2048 maxlen is a guess. How long a key does that permit? */ n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); if (!ok) return ((int)n); if (n < 0) goto err; CBS_init(&cbs, s->internal->init_msg, n); alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; if (alg_k & SSL_kRSA) { if (ssl3_get_client_kex_rsa(s, &cbs) != 1) goto err; } else if (alg_k & SSL_kDHE) { if (ssl3_get_client_kex_dhe(s, &cbs) != 1) goto err; } else if (alg_k & SSL_kECDHE) { if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) goto err; } else if (alg_k & SSL_kGOST) { if (ssl3_get_client_kex_gost(s, &cbs) != 1) goto err; } else { al = SSL_AD_HANDSHAKE_FAILURE; SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); goto f_err; } if (CBS_len(&cbs) != 0) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); goto f_err; } return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (-1); } int ssl3_get_cert_verify(SSL *s) { CBS cbs, signature; const struct ssl_sigalg *sigalg = NULL; const EVP_MD *md = NULL; EVP_PKEY *pkey = NULL; X509 *peer = NULL; EVP_MD_CTX mctx; int al, ok, verify; const unsigned char *hdata; size_t hdatalen; int type = 0; int ret = 0; long n; EVP_MD_CTX_init(&mctx); n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); if (!ok) return ((int)n); if (n < 0) goto err; CBS_init(&cbs, s->internal->init_msg, n); if (s->session->peer != NULL) { peer = s->session->peer; pkey = X509_get_pubkey(peer); type = X509_certificate_type(peer, pkey); } if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { S3I(s)->tmp.reuse_message = 1; if (peer != NULL) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); goto f_err; } ret = 1; goto end; } if (peer == NULL) { SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); al = SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } if (!(type & EVP_PKT_SIGN)) { SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); al = SSL_AD_ILLEGAL_PARAMETER; goto f_err; } if (S3I(s)->change_cipher_spec) { SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); al = SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } if (!SSL_USE_SIGALGS(s)) { if (!CBS_get_u16_length_prefixed(&cbs, &signature)) goto err; if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); al = SSL_AD_DECODE_ERROR; goto f_err; } if (CBS_len(&cbs) != 0) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); goto f_err; } } if (SSL_USE_SIGALGS(s)) { EVP_PKEY_CTX *pctx; uint16_t sigalg_value; if (!CBS_get_u16(&cbs, &sigalg_value)) goto truncated; if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, tls12_sigalgs_len)) == NULL || (md = sigalg->md()) == NULL) { SSLerror(s, SSL_R_UNKNOWN_DIGEST); al = SSL_AD_DECODE_ERROR; goto f_err; } if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); al = SSL_AD_DECODE_ERROR; goto f_err; } if (!CBS_get_u16_length_prefixed(&cbs, &signature)) goto err; if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); al = SSL_AD_DECODE_ERROR; goto f_err; } if (CBS_len(&cbs) != 0) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); goto f_err; } if (!tls1_transcript_data(s, &hdata, &hdatalen)) { SSLerror(s, ERR_R_INTERNAL_ERROR); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { SSLerror(s, ERR_R_EVP_LIB); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && (!EVP_PKEY_CTX_set_rsa_padding (pctx, RSA_PKCS1_PSS_PADDING) || !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { al = SSL_AD_INTERNAL_ERROR; goto f_err; } if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { SSLerror(s, ERR_R_EVP_LIB); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), CBS_len(&signature)) <= 0) { al = SSL_AD_DECRYPT_ERROR; SSLerror(s, SSL_R_BAD_SIGNATURE); goto f_err; } } else if (pkey->type == EVP_PKEY_RSA) { verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), CBS_len(&signature), pkey->pkey.rsa); if (verify < 0) { al = SSL_AD_DECRYPT_ERROR; SSLerror(s, SSL_R_BAD_RSA_DECRYPT); goto f_err; } if (verify == 0) { al = SSL_AD_DECRYPT_ERROR; SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); goto f_err; } } else if (pkey->type == EVP_PKEY_EC) { verify = ECDSA_verify(pkey->save_type, &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH, CBS_data(&signature), CBS_len(&signature), pkey->pkey.ec); if (verify <= 0) { al = SSL_AD_DECRYPT_ERROR; SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); goto f_err; } #ifndef OPENSSL_NO_GOST } else if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) { unsigned char sigbuf[128]; unsigned int siglen = sizeof(sigbuf); EVP_PKEY_CTX *pctx; int nid; if (!tls1_transcript_data(s, &hdata, &hdatalen)) { SSLerror(s, ERR_R_INTERNAL_ERROR); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || !(md = EVP_get_digestbynid(nid))) { SSLerror(s, ERR_R_EVP_LIB); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { SSLerror(s, ERR_R_EVP_LIB); al = SSL_AD_INTERNAL_ERROR; goto f_err; } if (!EVP_DigestInit_ex(&mctx, md, NULL) || !EVP_DigestUpdate(&mctx, hdata, hdatalen) || !EVP_DigestFinal(&mctx, sigbuf, &siglen) || (EVP_PKEY_verify_init(pctx) <= 0) || (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { SSLerror(s, ERR_R_EVP_LIB); al = SSL_AD_INTERNAL_ERROR; EVP_PKEY_CTX_free(pctx); goto f_err; } if (EVP_PKEY_verify(pctx, CBS_data(&signature), CBS_len(&signature), sigbuf, siglen) <= 0) { al = SSL_AD_DECRYPT_ERROR; SSLerror(s, SSL_R_BAD_SIGNATURE); EVP_PKEY_CTX_free(pctx); goto f_err; } EVP_PKEY_CTX_free(pctx); #endif } else { SSLerror(s, ERR_R_INTERNAL_ERROR); al = SSL_AD_UNSUPPORTED_CERTIFICATE; goto f_err; } ret = 1; if (0) { truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); } end: tls1_transcript_free(s); err: EVP_MD_CTX_cleanup(&mctx); EVP_PKEY_free(pkey); return (ret); } int ssl3_get_client_certificate(SSL *s) { CBS cbs, client_certs; int i, ok, al, ret = -1; X509 *x = NULL; long n; const unsigned char *q; STACK_OF(X509) *sk = NULL; n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, -1, s->internal->max_cert_list, &ok); if (!ok) return ((int)n); if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { if ((s->verify_mode & SSL_VERIFY_PEER) && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); al = SSL_AD_HANDSHAKE_FAILURE; goto f_err; } /* * If tls asked for a client cert, * the client must return a 0 list. */ if (S3I(s)->tmp.cert_request) { SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST ); al = SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } S3I(s)->tmp.reuse_message = 1; return (1); } if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); goto f_err; } if (n < 0) goto truncated; CBS_init(&cbs, s->internal->init_msg, n); if ((sk = sk_X509_new_null()) == NULL) { SSLerror(s, ERR_R_MALLOC_FAILURE); goto err; } if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || CBS_len(&cbs) != 0) goto truncated; while (CBS_len(&client_certs) > 0) { CBS cert; if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } q = CBS_data(&cert); x = d2i_X509(NULL, &q, CBS_len(&cert)); if (x == NULL) { SSLerror(s, ERR_R_ASN1_LIB); goto err; } if (q != CBS_data(&cert) + CBS_len(&cert)) { al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } if (!sk_X509_push(sk, x)) { SSLerror(s, ERR_R_MALLOC_FAILURE); goto err; } x = NULL; } if (sk_X509_num(sk) <= 0) { /* * TLS does not mind 0 certs returned. * Fail for TLS only if we required a certificate. */ if ((s->verify_mode & SSL_VERIFY_PEER) && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); al = SSL_AD_HANDSHAKE_FAILURE; goto f_err; } /* No client certificate so free transcript. */ tls1_transcript_free(s); } else { i = ssl_verify_cert_chain(s, sk); if (i <= 0) { al = ssl_verify_alarm_type(s->verify_result); SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); goto f_err; } } X509_free(s->session->peer); s->session->peer = sk_X509_shift(sk); s->session->verify_result = s->verify_result; /* * With the current implementation, sess_cert will always be NULL * when we arrive here */ if (SSI(s)->sess_cert == NULL) { SSI(s)->sess_cert = ssl_sess_cert_new(); if (SSI(s)->sess_cert == NULL) { SSLerror(s, ERR_R_MALLOC_FAILURE); goto err; } } sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); SSI(s)->sess_cert->cert_chain = sk; /* * Inconsistency alert: cert_chain does *not* include the * peer's own certificate, while we do include it in s3_clnt.c */ sk = NULL; ret = 1; if (0) { truncated: al = SSL_AD_DECODE_ERROR; SSLerror(s, SSL_R_BAD_PACKET_LENGTH); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); } err: X509_free(x); sk_X509_pop_free(sk, X509_free); return (ret); } int ssl3_send_server_certificate(SSL *s) { CBB cbb, server_cert; CERT_PKEY *cpk; /* * Server Certificate - RFC 5246, section 7.4.2. */ memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { SSLerror(s, ERR_R_INTERNAL_ERROR); return (0); } if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, SSL3_MT_CERTIFICATE)) goto err; if (!ssl3_output_cert_chain(s, &server_cert, cpk)) goto err; if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_CERT_B; } /* SSL3_ST_SW_CERT_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (0); } /* send a new session ticket (not necessarily for a new session) */ int ssl3_send_newsession_ticket(SSL *s) { CBB cbb, session_ticket, ticket; SSL_CTX *tctx = s->initial_ctx; size_t enc_session_len, enc_session_max_len, hmac_len; size_t session_len = 0; unsigned char *enc_session = NULL, *session = NULL; unsigned char iv[EVP_MAX_IV_LENGTH]; unsigned char key_name[16]; unsigned char *hmac; unsigned int hlen; EVP_CIPHER_CTX ctx; HMAC_CTX hctx; int len; /* * New Session Ticket - RFC 5077, section 3.3. */ EVP_CIPHER_CTX_init(&ctx); HMAC_CTX_init(&hctx); memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, SSL3_MT_NEWSESSION_TICKET)) goto err; if (!SSL_SESSION_ticket(s->session, &session, &session_len)) goto err; if (session_len > 0xffff) goto err; /* * Initialize HMAC and cipher contexts. If callback is present * it does all the work, otherwise use generated values from * parent context. */ if (tctx->internal->tlsext_ticket_key_cb != NULL) { if (tctx->internal->tlsext_ticket_key_cb(s, key_name, iv, &ctx, &hctx, 1) < 0) { EVP_CIPHER_CTX_cleanup(&ctx); goto err; } } else { arc4random_buf(iv, 16); EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, tctx->internal->tlsext_tick_aes_key, iv); HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 16, EVP_sha256(), NULL); memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); } /* Encrypt the session state. */ enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; if ((enc_session = calloc(1, enc_session_max_len)) == NULL) goto err; enc_session_len = 0; if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, session_len)) goto err; enc_session_len += len; if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, &len)) goto err; enc_session_len += len; if (enc_session_len > enc_session_max_len) goto err; /* Generate the HMAC. */ if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) goto err; if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) goto err; if (!HMAC_Update(&hctx, enc_session, enc_session_len)) goto err; if ((hmac_len = HMAC_size(&hctx)) <= 0) goto err; /* * Ticket lifetime hint (advisory only): * We leave this unspecified for resumed session * (for simplicity), and guess that tickets for new * sessions will live as long as their sessions. */ if (!CBB_add_u32(&session_ticket, s->internal->hit ? 0 : s->session->timeout)) goto err; if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) goto err; if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) goto err; if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) goto err; if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) goto err; if (!CBB_add_space(&ticket, &hmac, hmac_len)) goto err; if (!HMAC_Final(&hctx, hmac, &hlen)) goto err; if (hlen != hmac_len) goto err; if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; } EVP_CIPHER_CTX_cleanup(&ctx); HMAC_CTX_cleanup(&hctx); freezero(session, session_len); free(enc_session); /* SSL3_ST_SW_SESSION_TICKET_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); EVP_CIPHER_CTX_cleanup(&ctx); HMAC_CTX_cleanup(&hctx); freezero(session, session_len); free(enc_session); return (-1); } int ssl3_send_cert_status(SSL *s) { CBB cbb, certstatus, ocspresp; memset(&cbb, 0, sizeof(cbb)); if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, SSL3_MT_CERTIFICATE_STATUS)) goto err; if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) goto err; if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) goto err; if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, s->internal->tlsext_ocsp_resplen)) goto err; if (!ssl3_handshake_msg_finish(s, &cbb)) goto err; S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; } /* SSL3_ST_SW_CERT_STATUS_B */ return (ssl3_handshake_write(s)); err: CBB_cleanup(&cbb); return (-1); }