/* * Copyright 1995-2016 The OpenSSL Project Authors. 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 */ /* ==================================================================== * 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 #include "../ssl_locl.h" #include "statem_locl.h" #include #include #include #include #include #include #include #include static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt); static ossl_inline int cert_req_allowed(SSL *s); static int key_exchange_expected(SSL *s); static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b); static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, WPACKET *pkt); /* * Is a CertificateRequest message allowed at the moment or not? * * Return values are: * 1: Yes * 0: No */ static ossl_inline int cert_req_allowed(SSL *s) { /* TLS does not like anon-DH with client cert */ if ((s->version > SSL3_VERSION && (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) || (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aSRP | SSL_aPSK))) return 0; return 1; } /* * Should we expect the ServerKeyExchange message or not? * * Return values are: * 1: Yes * 0: No */ static int key_exchange_expected(SSL *s) { long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; /* * Can't skip server key exchange if this is an ephemeral * ciphersuite or for SRP */ if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK | SSL_kSRP)) { return 1; } return 0; } /* * ossl_statem_client_read_transition() encapsulates the logic for the allowed * handshake state transitions when a TLS1.3 client is reading messages from the * server. The message type that the server has sent is provided in |mt|. The * current state is in |s->statem.hand_state|. * * Return values are 1 for success (transition allowed) and 0 on error * (transition not allowed) */ static int ossl_statem_client13_read_transition(SSL *s, int mt) { OSSL_STATEM *st = &s->statem; /* * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time * we will update this to look more like real TLSv1.3 */ /* * Note: There is no case for TLS_ST_CW_CLNT_HELLO, because we haven't * yet negotiated TLSv1.3 at that point so that is handled by * ossl_statem_client_read_transition() */ switch (st->hand_state) { default: break; case TLS_ST_CR_SRVR_HELLO: if (mt == SSL3_MT_ENCRYPTED_EXTENSIONS) { st->hand_state = TLS_ST_CR_ENCRYPTED_EXTENSIONS; return 1; } break; case TLS_ST_CR_ENCRYPTED_EXTENSIONS: if (s->hit) { if (mt == SSL3_MT_FINISHED) { st->hand_state = TLS_ST_CR_FINISHED; return 1; } } else { if (mt == SSL3_MT_CERTIFICATE_REQUEST) { st->hand_state = TLS_ST_CR_CERT_REQ; return 1; } if (mt == SSL3_MT_CERTIFICATE) { st->hand_state = TLS_ST_CR_CERT; return 1; } } break; case TLS_ST_CR_CERT_REQ: if (mt == SSL3_MT_CERTIFICATE) { st->hand_state = TLS_ST_CR_CERT; return 1; } break; case TLS_ST_CR_CERT: if (mt == SSL3_MT_CERTIFICATE_VERIFY) { st->hand_state = TLS_ST_CR_CERT_VRFY; return 1; } break; case TLS_ST_CR_CERT_VRFY: if (mt == SSL3_MT_FINISHED) { st->hand_state = TLS_ST_CR_FINISHED; return 1; } break; case TLS_ST_OK: if (mt == SSL3_MT_NEWSESSION_TICKET) { st->hand_state = TLS_ST_CR_SESSION_TICKET; return 1; } break; } /* No valid transition found */ return 0; } /* * ossl_statem_client_read_transition() encapsulates the logic for the allowed * handshake state transitions when the client is reading messages from the * server. The message type that the server has sent is provided in |mt|. The * current state is in |s->statem.hand_state|. * * Return values are 1 for success (transition allowed) and 0 on error * (transition not allowed) */ int ossl_statem_client_read_transition(SSL *s, int mt) { OSSL_STATEM *st = &s->statem; int ske_expected; /* * Note that after a ClientHello we don't know what version we are going * to negotiate yet, so we don't take this branch until later */ if (SSL_IS_TLS13(s)) { if (!ossl_statem_client13_read_transition(s, mt)) goto err; return 1; } switch (st->hand_state) { default: break; case TLS_ST_CW_CLNT_HELLO: if (mt == SSL3_MT_SERVER_HELLO) { st->hand_state = TLS_ST_CR_SRVR_HELLO; return 1; } if (SSL_IS_DTLS(s)) { if (mt == DTLS1_MT_HELLO_VERIFY_REQUEST) { st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST; return 1; } } break; case TLS_ST_CR_SRVR_HELLO: if (s->hit) { if (s->ext.ticket_expected) { if (mt == SSL3_MT_NEWSESSION_TICKET) { st->hand_state = TLS_ST_CR_SESSION_TICKET; return 1; } } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { st->hand_state = TLS_ST_CR_CHANGE; return 1; } } else { if (SSL_IS_DTLS(s) && mt == DTLS1_MT_HELLO_VERIFY_REQUEST) { st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST; return 1; } else if (s->version >= TLS1_VERSION && s->ext.session_secret_cb != NULL && s->session->ext.tick != NULL && mt == SSL3_MT_CHANGE_CIPHER_SPEC) { /* * Normally, we can tell if the server is resuming the session * from the session ID. EAP-FAST (RFC 4851), however, relies on * the next server message after the ServerHello to determine if * the server is resuming. */ s->hit = 1; st->hand_state = TLS_ST_CR_CHANGE; return 1; } else if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { if (mt == SSL3_MT_CERTIFICATE) { st->hand_state = TLS_ST_CR_CERT; return 1; } } else { ske_expected = key_exchange_expected(s); /* SKE is optional for some PSK ciphersuites */ if (ske_expected || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK) && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) { if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) { st->hand_state = TLS_ST_CR_KEY_EXCH; return 1; } } else if (mt == SSL3_MT_CERTIFICATE_REQUEST && cert_req_allowed(s)) { st->hand_state = TLS_ST_CR_CERT_REQ; return 1; } else if (mt == SSL3_MT_SERVER_DONE) { st->hand_state = TLS_ST_CR_SRVR_DONE; return 1; } } } break; case TLS_ST_CR_CERT: /* * The CertificateStatus message is optional even if * |ext.status_expected| is set */ if (s->ext.status_expected && mt == SSL3_MT_CERTIFICATE_STATUS) { st->hand_state = TLS_ST_CR_CERT_STATUS; return 1; } /* Fall through */ case TLS_ST_CR_CERT_STATUS: ske_expected = key_exchange_expected(s); /* SKE is optional for some PSK ciphersuites */ if (ske_expected || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK) && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) { if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) { st->hand_state = TLS_ST_CR_KEY_EXCH; return 1; } goto err; } /* Fall through */ case TLS_ST_CR_KEY_EXCH: if (mt == SSL3_MT_CERTIFICATE_REQUEST) { if (cert_req_allowed(s)) { st->hand_state = TLS_ST_CR_CERT_REQ; return 1; } goto err; } /* Fall through */ case TLS_ST_CR_CERT_REQ: if (mt == SSL3_MT_SERVER_DONE) { st->hand_state = TLS_ST_CR_SRVR_DONE; return 1; } break; case TLS_ST_CW_FINISHED: if (s->ext.ticket_expected) { if (mt == SSL3_MT_NEWSESSION_TICKET) { st->hand_state = TLS_ST_CR_SESSION_TICKET; return 1; } } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { st->hand_state = TLS_ST_CR_CHANGE; return 1; } break; case TLS_ST_CR_SESSION_TICKET: if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { st->hand_state = TLS_ST_CR_CHANGE; return 1; } break; case TLS_ST_CR_CHANGE: if (mt == SSL3_MT_FINISHED) { st->hand_state = TLS_ST_CR_FINISHED; return 1; } break; case TLS_ST_OK: if (mt == SSL3_MT_HELLO_REQUEST) { st->hand_state = TLS_ST_CR_HELLO_REQ; return 1; } break; } err: /* No valid transition found */ ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); SSLerr(SSL_F_OSSL_STATEM_CLIENT_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE); return 0; } /* * ossl_statem_client13_write_transition() works out what handshake state to * move to next when the TLSv1.3 client is writing messages to be sent to the * server. */ static WRITE_TRAN ossl_statem_client13_write_transition(SSL *s) { OSSL_STATEM *st = &s->statem; /* * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time * we will update this to look more like real TLSv1.3 */ /* * Note: There are no cases for TLS_ST_BEFORE or TLS_ST_CW_CLNT_HELLO, * because we haven't negotiated TLSv1.3 yet at that point. They are * handled by ossl_statem_client_write_transition(). */ switch (st->hand_state) { default: /* Shouldn't happen */ return WRITE_TRAN_ERROR; case TLS_ST_CR_FINISHED: st->hand_state = (s->s3->tmp.cert_req != 0) ? TLS_ST_CW_CERT : TLS_ST_CW_FINISHED; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CERT: /* If a non-empty Certificate we also send CertificateVerify */ st->hand_state = (s->s3->tmp.cert_req == 1) ? TLS_ST_CW_CERT_VRFY : TLS_ST_CW_FINISHED; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CERT_VRFY: st->hand_state = TLS_ST_CW_FINISHED; return WRITE_TRAN_CONTINUE; case TLS_ST_CR_SESSION_TICKET: case TLS_ST_CW_FINISHED: st->hand_state = TLS_ST_OK; ossl_statem_set_in_init(s, 0); return WRITE_TRAN_CONTINUE; case TLS_ST_OK: /* Just go straight to trying to read from the server */ return WRITE_TRAN_FINISHED; } } /* * ossl_statem_client_write_transition() works out what handshake state to * move to next when the client is writing messages to be sent to the server. */ WRITE_TRAN ossl_statem_client_write_transition(SSL *s) { OSSL_STATEM *st = &s->statem; /* * Note that immediately before/after a ClientHello we don't know what * version we are going to negotiate yet, so we don't take this branch until * later */ if (SSL_IS_TLS13(s)) return ossl_statem_client13_write_transition(s); switch (st->hand_state) { default: /* Shouldn't happen */ return WRITE_TRAN_ERROR; case TLS_ST_OK: if (!s->renegotiate) { /* * We haven't requested a renegotiation ourselves so we must have * received a message from the server. Better read it. */ return WRITE_TRAN_FINISHED; } /* Renegotiation - fall through */ case TLS_ST_BEFORE: st->hand_state = TLS_ST_CW_CLNT_HELLO; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CLNT_HELLO: /* * No transition at the end of writing because we don't know what * we will be sent */ return WRITE_TRAN_FINISHED; case DTLS_ST_CR_HELLO_VERIFY_REQUEST: st->hand_state = TLS_ST_CW_CLNT_HELLO; return WRITE_TRAN_CONTINUE; case TLS_ST_CR_SRVR_DONE: if (s->s3->tmp.cert_req) st->hand_state = TLS_ST_CW_CERT; else st->hand_state = TLS_ST_CW_KEY_EXCH; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CERT: st->hand_state = TLS_ST_CW_KEY_EXCH; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_KEY_EXCH: /* * For TLS, cert_req is set to 2, so a cert chain of nothing is * sent, but no verify packet is sent */ /* * XXX: For now, we do not support client authentication in ECDH * cipher suites with ECDH (rather than ECDSA) certificates. We * need to skip the certificate verify message when client's * ECDH public key is sent inside the client certificate. */ if (s->s3->tmp.cert_req == 1) { st->hand_state = TLS_ST_CW_CERT_VRFY; } else { st->hand_state = TLS_ST_CW_CHANGE; } if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { st->hand_state = TLS_ST_CW_CHANGE; } return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CERT_VRFY: st->hand_state = TLS_ST_CW_CHANGE; return WRITE_TRAN_CONTINUE; case TLS_ST_CW_CHANGE: #if defined(OPENSSL_NO_NEXTPROTONEG) st->hand_state = TLS_ST_CW_FINISHED; #else if (!SSL_IS_DTLS(s) && s->s3->npn_seen) st->hand_state = TLS_ST_CW_NEXT_PROTO; else st->hand_state = TLS_ST_CW_FINISHED; #endif return WRITE_TRAN_CONTINUE; #if !defined(OPENSSL_NO_NEXTPROTONEG) case TLS_ST_CW_NEXT_PROTO: st->hand_state = TLS_ST_CW_FINISHED; return WRITE_TRAN_CONTINUE; #endif case TLS_ST_CW_FINISHED: if (s->hit) { st->hand_state = TLS_ST_OK; ossl_statem_set_in_init(s, 0); return WRITE_TRAN_CONTINUE; } else { return WRITE_TRAN_FINISHED; } case TLS_ST_CR_FINISHED: if (s->hit) { st->hand_state = TLS_ST_CW_CHANGE; return WRITE_TRAN_CONTINUE; } else { st->hand_state = TLS_ST_OK; ossl_statem_set_in_init(s, 0); return WRITE_TRAN_CONTINUE; } case TLS_ST_CR_HELLO_REQ: /* * If we can renegotiate now then do so, otherwise wait for a more * convenient time. */ if (ssl3_renegotiate_check(s, 1)) { if (!tls_setup_handshake(s)) { ossl_statem_set_error(s); return WRITE_TRAN_ERROR; } st->hand_state = TLS_ST_CW_CLNT_HELLO; return WRITE_TRAN_CONTINUE; } st->hand_state = TLS_ST_OK; ossl_statem_set_in_init(s, 0); return WRITE_TRAN_CONTINUE; } } /* * Perform any pre work that needs to be done prior to sending a message from * the client to the server. */ WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst) { OSSL_STATEM *st = &s->statem; switch (st->hand_state) { default: /* No pre work to be done */ break; case TLS_ST_CW_CLNT_HELLO: s->shutdown = 0; if (SSL_IS_DTLS(s)) { /* every DTLS ClientHello resets Finished MAC */ if (!ssl3_init_finished_mac(s)) { ossl_statem_set_error(s); return WORK_ERROR; } } break; case TLS_ST_CW_CHANGE: if (SSL_IS_DTLS(s)) { if (s->hit) { /* * We're into the last flight so we don't retransmit these * messages unless we need to. */ st->use_timer = 0; } #ifndef OPENSSL_NO_SCTP if (BIO_dgram_is_sctp(SSL_get_wbio(s))) return dtls_wait_for_dry(s); #endif } break; case TLS_ST_OK: return tls_finish_handshake(s, wst, 1); } return WORK_FINISHED_CONTINUE; } /* * Perform any work that needs to be done after sending a message from the * client to the server. case TLS_ST_SR_CERT_VRFY: return SSL3_RT_MAX_PLAIN_LENGTH; */ WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst) { OSSL_STATEM *st = &s->statem; s->init_num = 0; switch (st->hand_state) { default: /* No post work to be done */ break; case TLS_ST_CW_CLNT_HELLO: if (wst == WORK_MORE_A && statem_flush(s) != 1) return WORK_MORE_A; if (SSL_IS_DTLS(s)) { /* Treat the next message as the first packet */ s->first_packet = 1; } break; case TLS_ST_CW_KEY_EXCH: if (tls_client_key_exchange_post_work(s) == 0) return WORK_ERROR; break; case TLS_ST_CW_CHANGE: s->session->cipher = s->s3->tmp.new_cipher; #ifdef OPENSSL_NO_COMP s->session->compress_meth = 0; #else if (s->s3->tmp.new_compression == NULL) s->session->compress_meth = 0; else s->session->compress_meth = s->s3->tmp.new_compression->id; #endif if (!s->method->ssl3_enc->setup_key_block(s)) return WORK_ERROR; if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) return WORK_ERROR; if (SSL_IS_DTLS(s)) { #ifndef OPENSSL_NO_SCTP if (s->hit) { /* * Change to new shared key of SCTP-Auth, will be ignored if * no SCTP used. */ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); } #endif dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); } break; case TLS_ST_CW_FINISHED: #ifndef OPENSSL_NO_SCTP if (wst == WORK_MORE_A && SSL_IS_DTLS(s) && s->hit == 0) { /* * Change to new shared key of SCTP-Auth, will be ignored if * no SCTP used. */ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); } #endif if (statem_flush(s) != 1) return WORK_MORE_B; if (SSL_IS_TLS13(s)) { if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) return WORK_ERROR; } break; } return WORK_FINISHED_CONTINUE; } /* * Get the message construction function and message type for sending from the * client * * Valid return values are: * 1: Success * 0: Error */ int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt, confunc_f *confunc, int *mt) { OSSL_STATEM *st = &s->statem; switch (st->hand_state) { default: /* Shouldn't happen */ return 0; case TLS_ST_CW_CHANGE: if (SSL_IS_DTLS(s)) *confunc = dtls_construct_change_cipher_spec; else *confunc = tls_construct_change_cipher_spec; *mt = SSL3_MT_CHANGE_CIPHER_SPEC; break; case TLS_ST_CW_CLNT_HELLO: *confunc = tls_construct_client_hello; *mt = SSL3_MT_CLIENT_HELLO; break; case TLS_ST_CW_CERT: *confunc = tls_construct_client_certificate; *mt = SSL3_MT_CERTIFICATE; break; case TLS_ST_CW_KEY_EXCH: *confunc = tls_construct_client_key_exchange; *mt = SSL3_MT_CLIENT_KEY_EXCHANGE; break; case TLS_ST_CW_CERT_VRFY: *confunc = tls_construct_cert_verify; *mt = SSL3_MT_CERTIFICATE_VERIFY; break; #if !defined(OPENSSL_NO_NEXTPROTONEG) case TLS_ST_CW_NEXT_PROTO: *confunc = tls_construct_next_proto; *mt = SSL3_MT_NEXT_PROTO; break; #endif case TLS_ST_CW_FINISHED: *confunc = tls_construct_finished; *mt = SSL3_MT_FINISHED; break; } return 1; } /* * Returns the maximum allowed length for the current message that we are * reading. Excludes the message header. */ size_t ossl_statem_client_max_message_size(SSL *s) { OSSL_STATEM *st = &s->statem; switch (st->hand_state) { default: /* Shouldn't happen */ return 0; case TLS_ST_CR_SRVR_HELLO: return SERVER_HELLO_MAX_LENGTH; case DTLS_ST_CR_HELLO_VERIFY_REQUEST: return HELLO_VERIFY_REQUEST_MAX_LENGTH; case TLS_ST_CR_CERT: return s->max_cert_list; case TLS_ST_CR_CERT_VRFY: return SSL3_RT_MAX_PLAIN_LENGTH; case TLS_ST_CR_CERT_STATUS: return SSL3_RT_MAX_PLAIN_LENGTH; case TLS_ST_CR_KEY_EXCH: return SERVER_KEY_EXCH_MAX_LENGTH; case TLS_ST_CR_CERT_REQ: /* * Set to s->max_cert_list for compatibility with previous releases. In * practice these messages can get quite long if servers are configured * to provide a long list of acceptable CAs */ return s->max_cert_list; case TLS_ST_CR_SRVR_DONE: return SERVER_HELLO_DONE_MAX_LENGTH; case TLS_ST_CR_CHANGE: if (s->version == DTLS1_BAD_VER) return 3; return CCS_MAX_LENGTH; case TLS_ST_CR_SESSION_TICKET: return SSL3_RT_MAX_PLAIN_LENGTH; case TLS_ST_CR_FINISHED: return FINISHED_MAX_LENGTH; case TLS_ST_CR_ENCRYPTED_EXTENSIONS: return ENCRYPTED_EXTENSIONS_MAX_LENGTH; } } /* * Process a message that the client has been received from the server. */ MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt) { OSSL_STATEM *st = &s->statem; switch (st->hand_state) { default: /* Shouldn't happen */ return MSG_PROCESS_ERROR; case TLS_ST_CR_SRVR_HELLO: return tls_process_server_hello(s, pkt); case DTLS_ST_CR_HELLO_VERIFY_REQUEST: return dtls_process_hello_verify(s, pkt); case TLS_ST_CR_CERT: return tls_process_server_certificate(s, pkt); case TLS_ST_CR_CERT_VRFY: return tls_process_cert_verify(s, pkt); case TLS_ST_CR_CERT_STATUS: return tls_process_cert_status(s, pkt); case TLS_ST_CR_KEY_EXCH: return tls_process_key_exchange(s, pkt); case TLS_ST_CR_CERT_REQ: return tls_process_certificate_request(s, pkt); case TLS_ST_CR_SRVR_DONE: return tls_process_server_done(s, pkt); case TLS_ST_CR_CHANGE: return tls_process_change_cipher_spec(s, pkt); case TLS_ST_CR_SESSION_TICKET: return tls_process_new_session_ticket(s, pkt); case TLS_ST_CR_FINISHED: return tls_process_finished(s, pkt); case TLS_ST_CR_HELLO_REQ: return tls_process_hello_req(s, pkt); case TLS_ST_CR_ENCRYPTED_EXTENSIONS: return tls_process_encrypted_extensions(s, pkt); } } /* * Perform any further processing required following the receipt of a message * from the server */ WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst) { OSSL_STATEM *st = &s->statem; switch (st->hand_state) { default: /* Shouldn't happen */ return WORK_ERROR; case TLS_ST_CR_CERT_REQ: return tls_prepare_client_certificate(s, wst); #ifndef OPENSSL_NO_SCTP case TLS_ST_CR_SRVR_DONE: /* We only get here if we are using SCTP and we are renegotiating */ if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { s->s3->in_read_app_data = 2; s->rwstate = SSL_READING; BIO_clear_retry_flags(SSL_get_rbio(s)); BIO_set_retry_read(SSL_get_rbio(s)); ossl_statem_set_sctp_read_sock(s, 1); return WORK_MORE_A; } ossl_statem_set_sctp_read_sock(s, 0); return WORK_FINISHED_STOP; #endif } } int tls_construct_client_hello(SSL *s, WPACKET *pkt) { unsigned char *p; size_t sess_id_len; int i, protverr; int al = SSL_AD_HANDSHAKE_FAILURE; #ifndef OPENSSL_NO_COMP SSL_COMP *comp; #endif SSL_SESSION *sess = s->session; if (!WPACKET_set_max_size(pkt, SSL3_RT_MAX_PLAIN_LENGTH)) { /* Should not happen */ SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* Work out what SSL/TLS/DTLS version to use */ protverr = ssl_set_client_hello_version(s); if (protverr != 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, protverr); return 0; } if ((sess == NULL) || !ssl_version_supported(s, sess->ssl_version) || /* * In the case of EAP-FAST, we can have a pre-shared * "ticket" without a session ID. */ (!sess->session_id_length && !sess->ext.tick) || (sess->not_resumable)) { if (!ssl_get_new_session(s, 0)) return 0; } /* else use the pre-loaded session */ /* This is a real handshake so make sure we clean it up at the end */ s->statem.cleanuphand = 1; p = s->s3->client_random; /* * for DTLS if client_random is initialized, reuse it, we are * required to use same upon reply to HelloVerify */ if (SSL_IS_DTLS(s)) { size_t idx; i = 1; for (idx = 0; idx < sizeof(s->s3->client_random); idx++) { if (p[idx]) { i = 0; break; } } } else i = 1; if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)) <= 0) return 0; /*- * version indicates the negotiated version: for example from * an SSLv2/v3 compatible client hello). The client_version * field is the maximum version we permit and it is also * used in RSA encrypted premaster secrets. Some servers can * choke if we initially report a higher version then * renegotiate to a lower one in the premaster secret. This * didn't happen with TLS 1.0 as most servers supported it * but it can with TLS 1.1 or later if the server only supports * 1.0. * * Possible scenario with previous logic: * 1. Client hello indicates TLS 1.2 * 2. Server hello says TLS 1.0 * 3. RSA encrypted premaster secret uses 1.2. * 4. Handshake proceeds using TLS 1.0. * 5. Server sends hello request to renegotiate. * 6. Client hello indicates TLS v1.0 as we now * know that is maximum server supports. * 7. Server chokes on RSA encrypted premaster secret * containing version 1.0. * * For interoperability it should be OK to always use the * maximum version we support in client hello and then rely * on the checking of version to ensure the servers isn't * being inconsistent: for example initially negotiating with * TLS 1.0 and renegotiating with TLS 1.2. We do this by using * client_version in client hello and not resetting it to * the negotiated version. * * For TLS 1.3 we always set the ClientHello version to 1.2 and rely on the * supported_versions extension for the real supported versions. */ if (!WPACKET_put_bytes_u16(pkt, s->client_version) || !WPACKET_memcpy(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* Session ID */ if (s->new_session || s->session->ssl_version == TLS1_3_VERSION) sess_id_len = 0; else sess_id_len = s->session->session_id_length; if (sess_id_len > sizeof(s->session->session_id) || !WPACKET_start_sub_packet_u8(pkt) || (sess_id_len != 0 && !WPACKET_memcpy(pkt, s->session->session_id, sess_id_len)) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* cookie stuff for DTLS */ if (SSL_IS_DTLS(s)) { if (s->d1->cookie_len > sizeof(s->d1->cookie) || !WPACKET_sub_memcpy_u8(pkt, s->d1->cookie, s->d1->cookie_len)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } } /* Ciphers supported */ if (!WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* ssl_cipher_list_to_bytes() raises SSLerr if appropriate */ if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), pkt)) return 0; if (!WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* COMPRESSION */ if (!WPACKET_start_sub_packet_u8(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } #ifndef OPENSSL_NO_COMP if (ssl_allow_compression(s) && s->ctx->comp_methods) { int compnum = sk_SSL_COMP_num(s->ctx->comp_methods); for (i = 0; i < compnum; i++) { comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); if (!WPACKET_put_bytes_u8(pkt, comp->id)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } } } #endif /* Add the NULL method */ if (!WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } /* TLS extensions */ if (!tls_construct_extensions(s, pkt, EXT_CLIENT_HELLO, NULL, 0, &al)) { ssl3_send_alert(s, SSL3_AL_FATAL, al); SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return 0; } return 1; } MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt) { int al; size_t cookie_len; PACKET cookiepkt; if (!PACKET_forward(pkt, 2) || !PACKET_get_length_prefixed_1(pkt, &cookiepkt)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH); goto f_err; } cookie_len = PACKET_remaining(&cookiepkt); if (cookie_len > sizeof(s->d1->cookie)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_TOO_LONG); goto f_err; } if (!PACKET_copy_bytes(&cookiepkt, s->d1->cookie, cookie_len)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH); goto f_err; } s->d1->cookie_len = cookie_len; return MSG_PROCESS_FINISHED_READING; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); return MSG_PROCESS_ERROR; } MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt) { STACK_OF(SSL_CIPHER) *sk; const SSL_CIPHER *c; PACKET session_id, extpkt; size_t session_id_len; const unsigned char *cipherchars; int i, al = SSL_AD_INTERNAL_ERROR; unsigned int compression; unsigned int sversion; unsigned int context; int protverr; RAW_EXTENSION *extensions = NULL; #ifndef OPENSSL_NO_COMP SSL_COMP *comp; #endif if (!PACKET_get_net_2(pkt, &sversion)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); goto f_err; } protverr = ssl_choose_client_version(s, sversion); if (protverr != 0) { al = SSL_AD_PROTOCOL_VERSION; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, protverr); goto f_err; } /* load the server hello data */ /* load the server random */ if (!PACKET_copy_bytes(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); goto f_err; } s->hit = 0; /* Get the session-id. */ if (!SSL_IS_TLS13(s)) { if (!PACKET_get_length_prefixed_1(pkt, &session_id)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); goto f_err; } session_id_len = PACKET_remaining(&session_id); if (session_id_len > sizeof s->session->session_id || session_id_len > SSL3_SESSION_ID_SIZE) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG); goto f_err; } } else { PACKET_null_init(&session_id); session_id_len = 0; } if (!PACKET_get_bytes(pkt, &cipherchars, TLS_CIPHER_LEN)) { SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); al = SSL_AD_DECODE_ERROR; goto f_err; } /* * Check if we can resume the session based on external pre-shared secret. * EAP-FAST (RFC 4851) supports two types of session resumption. * Resumption based on server-side state works with session IDs. * Resumption based on pre-shared Protected Access Credentials (PACs) * works by overriding the SessionTicket extension at the application * layer, and does not send a session ID. (We do not know whether EAP-FAST * servers would honour the session ID.) Therefore, the session ID alone * is not a reliable indicator of session resumption, so we first check if * we can resume, and later peek at the next handshake message to see if the * server wants to resume. */ if (s->version >= TLS1_VERSION && !SSL_IS_TLS13(s) && s->ext.session_secret_cb != NULL && s->session->ext.tick) { const SSL_CIPHER *pref_cipher = NULL; /* * s->session->master_key_length is a size_t, but this is an int for * backwards compat reasons */ int master_key_length; master_key_length = sizeof(s->session->master_key); if (s->ext.session_secret_cb(s, s->session->master_key, &master_key_length, NULL, &pref_cipher, s->ext.session_secret_cb_arg) && master_key_length > 0) { s->session->master_key_length = master_key_length; s->session->cipher = pref_cipher ? pref_cipher : ssl_get_cipher_by_char(s, cipherchars); } else { SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, ERR_R_INTERNAL_ERROR); al = SSL_AD_INTERNAL_ERROR; goto f_err; } } if (session_id_len != 0 && session_id_len == s->session->session_id_length && memcmp(PACKET_data(&session_id), s->session->session_id, session_id_len) == 0) { if (s->sid_ctx_length != s->session->sid_ctx_length || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { /* actually a client application bug */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); goto f_err; } s->hit = 1; } else { /* * If we were trying for session-id reuse but the server * didn't echo the ID, make a new SSL_SESSION. * In the case of EAP-FAST and PAC, we do not send a session ID, * so the PAC-based session secret is always preserved. It'll be * overwritten if the server refuses resumption. */ if (s->session->session_id_length > 0) { s->ctx->stats.sess_miss++; if (!ssl_get_new_session(s, 0)) { goto f_err; } } s->session->ssl_version = s->version; s->session->session_id_length = session_id_len; /* session_id_len could be 0 */ if (session_id_len > 0) memcpy(s->session->session_id, PACKET_data(&session_id), session_id_len); } /* Session version and negotiated protocol version should match */ if (s->version != s->session->ssl_version) { al = SSL_AD_PROTOCOL_VERSION; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_SSL_SESSION_VERSION_MISMATCH); goto f_err; } c = ssl_get_cipher_by_char(s, cipherchars); if (c == NULL) { /* unknown cipher */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED); goto f_err; } /* * Now that we know the version, update the check to see if it's an allowed * version. */ s->s3->tmp.min_ver = s->version; s->s3->tmp.max_ver = s->version; /* * If it is a disabled cipher we either didn't send it in client hello, * or it's not allowed for the selected protocol. So we return an error. */ if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); goto f_err; } sk = ssl_get_ciphers_by_id(s); i = sk_SSL_CIPHER_find(sk, c); if (i < 0) { /* we did not say we would use this cipher */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); goto f_err; } /* * Depending on the session caching (internal/external), the cipher * and/or cipher_id values may not be set. Make sure that cipher_id is * set and use it for comparison. */ if (s->session->cipher) s->session->cipher_id = s->session->cipher->id; if (s->hit && (s->session->cipher_id != c->id)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); goto f_err; } s->s3->tmp.new_cipher = c; /* lets get the compression algorithm */ /* COMPRESSION */ if (!SSL_IS_TLS13(s)) { if (!PACKET_get_1(pkt, &compression)) { SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); al = SSL_AD_DECODE_ERROR; goto f_err; } } else { compression = 0; } #ifdef OPENSSL_NO_COMP if (compression != 0) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); goto f_err; } /* * If compression is disabled we'd better not try to resume a session * using compression. */ if (s->session->compress_meth != 0) { SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION); goto f_err; } #else if (s->hit && compression != s->session->compress_meth) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); goto f_err; } if (compression == 0) comp = NULL; else if (!ssl_allow_compression(s)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED); goto f_err; } else { comp = ssl3_comp_find(s->ctx->comp_methods, compression); } if (compression != 0 && comp == NULL) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); goto f_err; } else { s->s3->tmp.new_compression = comp; } #endif /* TLS extensions */ if (PACKET_remaining(pkt) == 0) { PACKET_null_init(&extpkt); } else if (!PACKET_as_length_prefixed_2(pkt, &extpkt)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_BAD_LENGTH); goto f_err; } context = SSL_IS_TLS13(s) ? EXT_TLS1_3_SERVER_HELLO : EXT_TLS1_2_SERVER_HELLO; if (!tls_collect_extensions(s, &extpkt, context, &extensions, &al) || !tls_parse_all_extensions(s, context, extensions, NULL, 0, &al)) goto f_err; #ifndef OPENSSL_NO_SCTP if (SSL_IS_DTLS(s) && s->hit) { unsigned char sctpauthkey[64]; char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; /* * Add new shared key for SCTP-Auth, will be ignored if * no SCTP used. */ memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, sizeof(DTLS1_SCTP_AUTH_LABEL)); if (SSL_export_keying_material(s, sctpauthkey, sizeof(sctpauthkey), labelbuffer, sizeof(labelbuffer), NULL, 0, 0) <= 0) goto f_err; BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, sizeof(sctpauthkey), sctpauthkey); } #endif /* * In TLSv1.3 we have some post-processing to change cipher state, otherwise * we're done with this message */ if (SSL_IS_TLS13(s) && (!s->method->ssl3_enc->setup_key_block(s) || !s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE) || !s->method->ssl3_enc->change_cipher_state(s, SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_READ))) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_CANNOT_CHANGE_CIPHER); goto f_err; } OPENSSL_free(extensions); return MSG_PROCESS_CONTINUE_READING; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); OPENSSL_free(extensions); return MSG_PROCESS_ERROR; } MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt) { int al, i, ret = MSG_PROCESS_ERROR, exp_idx; unsigned long cert_list_len, cert_len; X509 *x = NULL; const unsigned char *certstart, *certbytes; STACK_OF(X509) *sk = NULL; EVP_PKEY *pkey = NULL; size_t chainidx; unsigned int context = 0; if ((sk = sk_X509_new_null()) == NULL) { SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } if ((SSL_IS_TLS13(s) && !PACKET_get_1(pkt, &context)) || context != 0 || !PACKET_get_net_3(pkt, &cert_list_len) || PACKET_remaining(pkt) != cert_list_len) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH); goto f_err; } for (chainidx = 0; PACKET_remaining(pkt); chainidx++) { if (!PACKET_get_net_3(pkt, &cert_len) || !PACKET_get_bytes(pkt, &certbytes, cert_len)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } certstart = certbytes; x = d2i_X509(NULL, (const unsigned char **)&certbytes, cert_len); if (x == NULL) { al = SSL_AD_BAD_CERTIFICATE; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_ASN1_LIB); goto f_err; } if (certbytes != (certstart + cert_len)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } if (SSL_IS_TLS13(s)) { RAW_EXTENSION *rawexts = NULL; PACKET extensions; if (!PACKET_get_length_prefixed_2(pkt, &extensions)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_BAD_LENGTH); goto f_err; } if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_CERTIFICATE, &rawexts, &al) || !tls_parse_all_extensions(s, EXT_TLS1_3_CERTIFICATE, rawexts, x, chainidx, &al)) { OPENSSL_free(rawexts); goto f_err; } OPENSSL_free(rawexts); } if (!sk_X509_push(sk, x)) { SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } x = NULL; } i = ssl_verify_cert_chain(s, sk); /* * The documented interface is that SSL_VERIFY_PEER should be set in order * for client side verification of the server certificate to take place. * However, historically the code has only checked that *any* flag is set * to cause server verification to take place. Use of the other flags makes * no sense in client mode. An attempt to clean up the semantics was * reverted because at least one application *only* set * SSL_VERIFY_FAIL_IF_NO_PEER_CERT. Prior to the clean up this still caused * server verification to take place, after the clean up it silently did * nothing. SSL_CTX_set_verify()/SSL_set_verify() cannot validate the flags * sent to them because they are void functions. Therefore, we now use the * (less clean) historic behaviour of performing validation if any flag is * set. The *documented* interface remains the same. */ if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) { al = ssl_verify_alarm_type(s->verify_result); SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_CERTIFICATE_VERIFY_FAILED); goto f_err; } ERR_clear_error(); /* but we keep s->verify_result */ if (i > 1) { SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, i); al = SSL_AD_HANDSHAKE_FAILURE; goto f_err; } s->session->peer_chain = sk; /* * Inconsistency alert: cert_chain does include the peer's certificate, * which we don't include in statem_srvr.c */ x = sk_X509_value(sk, 0); sk = NULL; /* * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */ pkey = X509_get0_pubkey(x); if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { x = NULL; al = SSL3_AL_FATAL; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); goto f_err; } i = ssl_cert_type(x, pkey); if (i < 0) { x = NULL; al = SSL3_AL_FATAL; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_UNKNOWN_CERTIFICATE_TYPE); goto f_err; } exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher); if (exp_idx >= 0 && i != exp_idx && (exp_idx != SSL_PKEY_GOST_EC || (i != SSL_PKEY_GOST12_512 && i != SSL_PKEY_GOST12_256 && i != SSL_PKEY_GOST01))) { x = NULL; al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_WRONG_CERTIFICATE_TYPE); goto f_err; } s->session->peer_type = i; X509_free(s->session->peer); X509_up_ref(x); s->session->peer = x; s->session->verify_result = s->verify_result; x = NULL; /* Save the current hash state for when we receive the CertificateVerify */ if (SSL_IS_TLS13(s) && !ssl_handshake_hash(s, s->cert_verify_hash, sizeof(s->cert_verify_hash), &s->cert_verify_hash_len)) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto f_err; } ret = MSG_PROCESS_CONTINUE_READING; goto done; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: ossl_statem_set_error(s); done: X509_free(x); sk_X509_pop_free(sk, X509_free); return ret; } static int tls_process_ske_psk_preamble(SSL *s, PACKET *pkt, int *al) { #ifndef OPENSSL_NO_PSK PACKET psk_identity_hint; /* PSK ciphersuites are preceded by an identity hint */ if (!PACKET_get_length_prefixed_2(pkt, &psk_identity_hint)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH); return 0; } /* * Store PSK identity hint for later use, hint is used in * tls_construct_client_key_exchange. Assume that the maximum length of * a PSK identity hint can be as long as the maximum length of a PSK * identity. */ if (PACKET_remaining(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN) { *al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG); return 0; } if (PACKET_remaining(&psk_identity_hint) == 0) { OPENSSL_free(s->session->psk_identity_hint); s->session->psk_identity_hint = NULL; } else if (!PACKET_strndup(&psk_identity_hint, &s->session->psk_identity_hint)) { *al = SSL_AD_INTERNAL_ERROR; return 0; } return 1; #else SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_process_ske_srp(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al) { #ifndef OPENSSL_NO_SRP PACKET prime, generator, salt, server_pub; if (!PACKET_get_length_prefixed_2(pkt, &prime) || !PACKET_get_length_prefixed_2(pkt, &generator) || !PACKET_get_length_prefixed_1(pkt, &salt) || !PACKET_get_length_prefixed_2(pkt, &server_pub)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_LENGTH_MISMATCH); return 0; } /* TODO(size_t): Convert BN_bin2bn() calls */ if ((s->srp_ctx.N = BN_bin2bn(PACKET_data(&prime), (int)PACKET_remaining(&prime), NULL)) == NULL || (s->srp_ctx.g = BN_bin2bn(PACKET_data(&generator), (int)PACKET_remaining(&generator), NULL)) == NULL || (s->srp_ctx.s = BN_bin2bn(PACKET_data(&salt), (int)PACKET_remaining(&salt), NULL)) == NULL || (s->srp_ctx.B = BN_bin2bn(PACKET_data(&server_pub), (int)PACKET_remaining(&server_pub), NULL)) == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_BN_LIB); return 0; } if (!srp_verify_server_param(s, al)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_BAD_SRP_PARAMETERS); return 0; } /* We must check if there is a certificate */ if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS)) *pkey = X509_get0_pubkey(s->session->peer); return 1; #else SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_process_ske_dhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al) { #ifndef OPENSSL_NO_DH PACKET prime, generator, pub_key; EVP_PKEY *peer_tmp = NULL; DH *dh = NULL; BIGNUM *p = NULL, *g = NULL, *bnpub_key = NULL; int check_bits = 0; if (!PACKET_get_length_prefixed_2(pkt, &prime) || !PACKET_get_length_prefixed_2(pkt, &generator) || !PACKET_get_length_prefixed_2(pkt, &pub_key)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_LENGTH_MISMATCH); return 0; } peer_tmp = EVP_PKEY_new(); dh = DH_new(); if (peer_tmp == NULL || dh == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_MALLOC_FAILURE); goto err; } /* TODO(size_t): Convert these calls */ p = BN_bin2bn(PACKET_data(&prime), (int)PACKET_remaining(&prime), NULL); g = BN_bin2bn(PACKET_data(&generator), (int)PACKET_remaining(&generator), NULL); bnpub_key = BN_bin2bn(PACKET_data(&pub_key), (int)PACKET_remaining(&pub_key), NULL); if (p == NULL || g == NULL || bnpub_key == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB); goto err; } /* test non-zero pupkey */ if (BN_is_zero(bnpub_key)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE); goto err; } if (!DH_set0_pqg(dh, p, NULL, g)) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB); goto err; } p = g = NULL; if (DH_check_params(dh, &check_bits) == 0 || check_bits != 0) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE); goto err; } if (!DH_set0_key(dh, bnpub_key, NULL)) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB); goto err; } bnpub_key = NULL; if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) { *al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_DH_KEY_TOO_SMALL); goto err; } if (EVP_PKEY_assign_DH(peer_tmp, dh) == 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_EVP_LIB); goto err; } s->s3->peer_tmp = peer_tmp; /* * FIXME: This makes assumptions about which ciphersuites come with * public keys. We should have a less ad-hoc way of doing this */ if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS)) *pkey = X509_get0_pubkey(s->session->peer); /* else anonymous DH, so no certificate or pkey. */ return 1; err: BN_free(p); BN_free(g); BN_free(bnpub_key); DH_free(dh); EVP_PKEY_free(peer_tmp); return 0; #else SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_process_ske_ecdhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al) { #ifndef OPENSSL_NO_EC PACKET encoded_pt; const unsigned char *ecparams; int curve_nid; unsigned int curve_flags; EVP_PKEY_CTX *pctx = NULL; /* * Extract elliptic curve parameters and the server's ephemeral ECDH * public key. For now we only support named (not generic) curves and * ECParameters in this case is just three bytes. */ if (!PACKET_get_bytes(pkt, &ecparams, 3)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_TOO_SHORT); return 0; } /* * Check curve is one of our preferences, if not server has sent an * invalid curve. ECParameters is 3 bytes. */ if (!tls1_check_curve(s, ecparams, 3)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_WRONG_CURVE); return 0; } curve_nid = tls1_ec_curve_id2nid(*(ecparams + 2), &curve_flags); if (curve_nid == 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); return 0; } if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) { EVP_PKEY *key = EVP_PKEY_new(); if (key == NULL || !EVP_PKEY_set_type(key, curve_nid)) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB); EVP_PKEY_free(key); return 0; } s->s3->peer_tmp = key; } else { /* Set up EVP_PKEY with named curve as parameters */ pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL); if (pctx == NULL || EVP_PKEY_paramgen_init(pctx) <= 0 || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, curve_nid) <= 0 || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB); EVP_PKEY_CTX_free(pctx); return 0; } EVP_PKEY_CTX_free(pctx); pctx = NULL; } if (!PACKET_get_length_prefixed_1(pkt, &encoded_pt)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_MISMATCH); return 0; } if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp, PACKET_data(&encoded_pt), PACKET_remaining(&encoded_pt))) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_BAD_ECPOINT); return 0; } /* * The ECC/TLS specification does not mention the use of DSA to sign * ECParameters in the server key exchange message. We do support RSA * and ECDSA. */ if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA) *pkey = X509_get0_pubkey(s->session->peer); else if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aRSA) *pkey = X509_get0_pubkey(s->session->peer); /* else anonymous ECDH, so no certificate or pkey. */ return 1; #else SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt) { int al = -1, ispss = 0; long alg_k; EVP_PKEY *pkey = NULL; EVP_MD_CTX *md_ctx = NULL; EVP_PKEY_CTX *pctx = NULL; PACKET save_param_start, signature; alg_k = s->s3->tmp.new_cipher->algorithm_mkey; save_param_start = *pkt; #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) EVP_PKEY_free(s->s3->peer_tmp); s->s3->peer_tmp = NULL; #endif if (alg_k & SSL_PSK) { if (!tls_process_ske_psk_preamble(s, pkt, &al)) goto err; } /* Nothing else to do for plain PSK or RSAPSK */ if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) { } else if (alg_k & SSL_kSRP) { if (!tls_process_ske_srp(s, pkt, &pkey, &al)) goto err; } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { if (!tls_process_ske_dhe(s, pkt, &pkey, &al)) goto err; } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { if (!tls_process_ske_ecdhe(s, pkt, &pkey, &al)) goto err; } else if (alg_k) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); goto err; } /* if it was signed, check the signature */ if (pkey != NULL) { PACKET params; int maxsig; const EVP_MD *md = NULL; /* * |pkt| now points to the beginning of the signature, so the difference * equals the length of the parameters. */ if (!PACKET_get_sub_packet(&save_param_start, ¶ms, PACKET_remaining(&save_param_start) - PACKET_remaining(pkt))) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if (SSL_USE_SIGALGS(s)) { unsigned int sigalg; int rv; if (!PACKET_get_net_2(pkt, &sigalg)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto err; } rv = tls12_check_peer_sigalg(&md, s, sigalg, pkey); if (rv == -1) { al = SSL_AD_INTERNAL_ERROR; goto err; } else if (rv == 0) { al = SSL_AD_DECODE_ERROR; goto err; } ispss = SIGID_IS_PSS(sigalg); #ifdef SSL_DEBUG fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); #endif } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { md = EVP_md5_sha1(); } else { md = EVP_sha1(); } if (!PACKET_get_length_prefixed_2(pkt, &signature) || PACKET_remaining(pkt) != 0) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); goto err; } maxsig = EVP_PKEY_size(pkey); if (maxsig < 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } /* * Check signature length */ if (PACKET_remaining(&signature) > (size_t)maxsig) { /* wrong packet length */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH); goto err; } md_ctx = EVP_MD_CTX_new(); if (md_ctx == NULL) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } if (EVP_DigestVerifyInit(md_ctx, &pctx, md, NULL, pkey) <= 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB); goto err; } if (ispss) { if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 /* -1 here means set saltlen to the digest len */ || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1) <= 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB); goto err; } } if (EVP_DigestVerifyUpdate(md_ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE) <= 0 || EVP_DigestVerifyUpdate(md_ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE) <= 0 || EVP_DigestVerifyUpdate(md_ctx, PACKET_data(¶ms), PACKET_remaining(¶ms)) <= 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB); goto err; } if (EVP_DigestVerifyFinal(md_ctx, PACKET_data(&signature), PACKET_remaining(&signature)) <= 0) { /* bad signature */ al = SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); goto err; } EVP_MD_CTX_free(md_ctx); md_ctx = NULL; } else { /* aNULL, aSRP or PSK do not need public keys */ if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_PSK)) { /* Might be wrong key type, check it */ if (ssl3_check_cert_and_algorithm(s)) { /* Otherwise this shouldn't happen */ al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); } else { al = SSL_AD_DECODE_ERROR; } goto err; } /* still data left over */ if (PACKET_remaining(pkt) != 0) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE); goto err; } } return MSG_PROCESS_CONTINUE_READING; err: if (al != -1) ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); EVP_MD_CTX_free(md_ctx); return MSG_PROCESS_ERROR; } MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt) { int ret = MSG_PROCESS_ERROR; unsigned int list_len, ctype_num, i, name_len; X509_NAME *xn = NULL; const unsigned char *data; const unsigned char *namestart, *namebytes; STACK_OF(X509_NAME) *ca_sk = NULL; if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } /* get the certificate types */ if (!PACKET_get_1(pkt, &ctype_num) || !PACKET_get_bytes(pkt, &data, ctype_num)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); goto err; } OPENSSL_free(s->cert->ctypes); s->cert->ctypes = NULL; if (ctype_num > SSL3_CT_NUMBER) { /* If we exceed static buffer copy all to cert structure */ s->cert->ctypes = OPENSSL_malloc(ctype_num); if (s->cert->ctypes == NULL) { SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } memcpy(s->cert->ctypes, data, ctype_num); s->cert->ctype_num = ctype_num; ctype_num = SSL3_CT_NUMBER; } for (i = 0; i < ctype_num; i++) s->s3->tmp.ctype[i] = data[i]; if (SSL_USE_SIGALGS(s)) { PACKET sigalgs; if (!PACKET_get_length_prefixed_2(pkt, &sigalgs)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); goto err; } /* Clear certificate digests and validity flags */ for (i = 0; i < SSL_PKEY_NUM; i++) { s->s3->tmp.md[i] = NULL; s->s3->tmp.valid_flags[i] = 0; } if (!tls1_save_sigalgs(s, &sigalgs)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_SIGNATURE_ALGORITHMS_ERROR); goto err; } if (!tls1_process_sigalgs(s)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } } else { ssl_set_default_md(s); } /* get the CA RDNs */ if (!PACKET_get_net_2(pkt, &list_len) || PACKET_remaining(pkt) != list_len) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); goto err; } while (PACKET_remaining(pkt)) { if (!PACKET_get_net_2(pkt, &name_len) || !PACKET_get_bytes(pkt, &namebytes, name_len)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); goto err; } namestart = namebytes; if ((xn = d2i_X509_NAME(NULL, (const unsigned char **)&namebytes, name_len)) == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB); goto err; } if (namebytes != (namestart + name_len)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_CA_DN_LENGTH_MISMATCH); goto err; } if (!sk_X509_NAME_push(ca_sk, xn)) { SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } xn = NULL; } /* we should setup a certificate to return.... */ s->s3->tmp.cert_req = 1; s->s3->tmp.ctype_num = ctype_num; sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free); s->s3->tmp.ca_names = ca_sk; ca_sk = NULL; ret = MSG_PROCESS_CONTINUE_PROCESSING; goto done; err: ossl_statem_set_error(s); done: X509_NAME_free(xn); sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); return ret; } static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b) { return (X509_NAME_cmp(*a, *b)); } MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt) { int al; unsigned int ticklen; unsigned long ticket_lifetime_hint, add_age; unsigned int sess_len; RAW_EXTENSION *exts = NULL; if (!PACKET_get_net_4(pkt, &ticket_lifetime_hint) || (SSL_IS_TLS13(s) && !PACKET_get_net_4(pkt, &add_age)) || !PACKET_get_net_2(pkt, &ticklen) || (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) != ticklen) || (SSL_IS_TLS13(s) && (ticklen == 0 || PACKET_remaining(pkt) < ticklen))) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); goto f_err; } /* * Server is allowed to change its mind (in <=TLSv1.2) and send an empty * ticket. We already checked this TLSv1.3 case above, so it should never * be 0 here in that instance */ if (ticklen == 0) return MSG_PROCESS_CONTINUE_READING; /* TODO(TLS1.3): Is this a suitable test for TLS1.3? */ if (s->session->session_id_length > 0) { int i = s->session_ctx->session_cache_mode; SSL_SESSION *new_sess; /* * We reused an existing session, so we need to replace it with a new * one */ if (i & SSL_SESS_CACHE_CLIENT) { /* * Remove the old session from the cache. We carry on if this fails */ SSL_CTX_remove_session(s->session_ctx, s->session); } if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); goto f_err; } SSL_SESSION_free(s->session); s->session = new_sess; } OPENSSL_free(s->session->ext.tick); s->session->ext.tick = NULL; s->session->ext.ticklen = 0; s->session->ext.tick = OPENSSL_malloc(ticklen); if (s->session->ext.tick == NULL) { SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); goto err; } if (!PACKET_copy_bytes(pkt, s->session->ext.tick, ticklen)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); goto f_err; } s->session->ext.tick_lifetime_hint = ticket_lifetime_hint; s->session->ext.ticklen = ticklen; if (SSL_IS_TLS13(s)) { PACKET extpkt; if (!PACKET_as_length_prefixed_2(pkt, &extpkt) || !tls_collect_extensions(s, &extpkt, EXT_TLS1_3_NEW_SESSION_TICKET, &exts, &al) || !tls_parse_all_extensions(s, EXT_TLS1_3_NEW_SESSION_TICKET, exts, NULL, 0, &al)) { SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_BAD_EXTENSION); goto f_err; } } /* * There are two ways to detect a resumed ticket session. One is to set * an appropriate session ID and then the server must return a match in * ServerHello. This allows the normal client session ID matching to work * and we know much earlier that the ticket has been accepted. The * other way is to set zero length session ID when the ticket is * presented and rely on the handshake to determine session resumption. * We choose the former approach because this fits in with assumptions * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is * SHA256 is disabled) hash of the ticket. */ /* * TODO(size_t): we use sess_len here because EVP_Digest expects an int * but s->session->session_id_length is a size_t */ if (!EVP_Digest(s->session->ext.tick, ticklen, s->session->session_id, &sess_len, EVP_sha256(), NULL)) { SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_EVP_LIB); goto err; } s->session->session_id_length = sess_len; /* This is a standalone message in TLSv1.3, so there is no more to read */ if (SSL_IS_TLS13(s)) { ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); return MSG_PROCESS_FINISHED_READING; } return MSG_PROCESS_CONTINUE_READING; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: ossl_statem_set_error(s); return MSG_PROCESS_ERROR; } /* * In TLSv1.3 this is called from the extensions code, otherwise it is used to * parse a separate message. Returns 1 on success or 0 on failure. On failure * |*al| is populated with a suitable alert code. */ int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al) { size_t resplen; unsigned int type; if (!PACKET_get_1(pkt, &type) || type != TLSEXT_STATUSTYPE_ocsp) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, SSL_R_UNSUPPORTED_STATUS_TYPE); return 0; } if (!PACKET_get_net_3_len(pkt, &resplen) || PACKET_remaining(pkt) != resplen) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, SSL_R_LENGTH_MISMATCH); return 0; } s->ext.ocsp.resp = OPENSSL_malloc(resplen); if (s->ext.ocsp.resp == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, ERR_R_MALLOC_FAILURE); return 0; } if (!PACKET_copy_bytes(pkt, s->ext.ocsp.resp, resplen)) { *al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS_BODY, SSL_R_LENGTH_MISMATCH); return 0; } s->ext.ocsp.resp_len = resplen; return 1; } MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt) { int al; if (!tls_process_cert_status_body(s, pkt, &al)) { ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); return MSG_PROCESS_ERROR; } return MSG_PROCESS_CONTINUE_READING; } /* * Perform miscellaneous checks and processing after we have received the * server's initial flight. In TLS1.3 this is after the Server Finished message. * In <=TLS1.2 this is after the ServerDone message. Returns 1 on success or 0 * on failure. */ int tls_process_initial_server_flight(SSL *s, int *al) { /* * at this point we check that we have the required stuff from * the server */ if (!ssl3_check_cert_and_algorithm(s)) { *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } /* * Call the ocsp status callback if needed. The |ext.ocsp.resp| and * |ext.ocsp.resp_len| values will be set if we actually received a status * message, or NULL and -1 otherwise */ if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx->ext.status_cb != NULL) { int ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg); if (ret == 0) { *al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; SSLerr(SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT, SSL_R_INVALID_STATUS_RESPONSE); return 0; } if (ret < 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT, ERR_R_MALLOC_FAILURE); return 0; } } #ifndef OPENSSL_NO_CT if (s->ct_validation_callback != NULL) { /* Note we validate the SCTs whether or not we abort on error */ if (!ssl_validate_ct(s) && (s->verify_mode & SSL_VERIFY_PEER)) { *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } } #endif return 1; } MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt) { int al = SSL_AD_INTERNAL_ERROR; if (PACKET_remaining(pkt) > 0) { /* should contain no data */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_LENGTH_MISMATCH); goto err; } #ifndef OPENSSL_NO_SRP if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { if (SRP_Calc_A_param(s) <= 0) { SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_SRP_A_CALC); goto err; } } #endif /* * Error queue messages are generated directly by this function */ if (!tls_process_initial_server_flight(s, &al)) goto err; #ifndef OPENSSL_NO_SCTP /* Only applies to renegotiation */ if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)) && s->renegotiate != 0) return MSG_PROCESS_CONTINUE_PROCESSING; else #endif return MSG_PROCESS_FINISHED_READING; err: ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); return MSG_PROCESS_ERROR; } static int tls_construct_cke_psk_preamble(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_PSK int ret = 0; /* * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a * \0-terminated identity. The last byte is for us for simulating * strnlen. */ char identity[PSK_MAX_IDENTITY_LEN + 1]; size_t identitylen = 0; unsigned char psk[PSK_MAX_PSK_LEN]; unsigned char *tmppsk = NULL; char *tmpidentity = NULL; size_t psklen = 0; if (s->psk_client_callback == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_CLIENT_CB); *al = SSL_AD_INTERNAL_ERROR; goto err; } memset(identity, 0, sizeof(identity)); psklen = s->psk_client_callback(s, s->session->psk_identity_hint, identity, sizeof(identity) - 1, psk, sizeof(psk)); if (psklen > PSK_MAX_PSK_LEN) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_HANDSHAKE_FAILURE; goto err; } else if (psklen == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, SSL_R_PSK_IDENTITY_NOT_FOUND); *al = SSL_AD_HANDSHAKE_FAILURE; goto err; } identitylen = strlen(identity); if (identitylen > PSK_MAX_IDENTITY_LEN) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_HANDSHAKE_FAILURE; goto err; } tmppsk = OPENSSL_memdup(psk, psklen); tmpidentity = OPENSSL_strdup(identity); if (tmppsk == NULL || tmpidentity == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE); *al = SSL_AD_INTERNAL_ERROR; goto err; } OPENSSL_free(s->s3->tmp.psk); s->s3->tmp.psk = tmppsk; s->s3->tmp.psklen = psklen; tmppsk = NULL; OPENSSL_free(s->session->psk_identity); s->session->psk_identity = tmpidentity; tmpidentity = NULL; if (!WPACKET_sub_memcpy_u16(pkt, identity, identitylen)) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; goto err; } ret = 1; err: OPENSSL_cleanse(psk, psklen); OPENSSL_cleanse(identity, sizeof(identity)); OPENSSL_clear_free(tmppsk, psklen); OPENSSL_clear_free(tmpidentity, identitylen); return ret; #else SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_construct_cke_rsa(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_RSA unsigned char *encdata = NULL; EVP_PKEY *pkey = NULL; EVP_PKEY_CTX *pctx = NULL; size_t enclen; unsigned char *pms = NULL; size_t pmslen = 0; if (s->session->peer == NULL) { /* * We should always have a server certificate with SSL_kRSA. */ SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR); return 0; } pkey = X509_get0_pubkey(s->session->peer); if (EVP_PKEY_get0_RSA(pkey) == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR); return 0; } pmslen = SSL_MAX_MASTER_KEY_LENGTH; pms = OPENSSL_malloc(pmslen); if (pms == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_MALLOC_FAILURE); *al = SSL_AD_INTERNAL_ERROR; return 0; } pms[0] = s->client_version >> 8; pms[1] = s->client_version & 0xff; /* TODO(size_t): Convert this function */ if (RAND_bytes(pms + 2, (int)(pmslen - 2)) <= 0) { goto err; } /* Fix buf for TLS and beyond */ if (s->version > SSL3_VERSION && !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR); goto err; } pctx = EVP_PKEY_CTX_new(pkey, NULL); if (pctx == NULL || EVP_PKEY_encrypt_init(pctx) <= 0 || EVP_PKEY_encrypt(pctx, NULL, &enclen, pms, pmslen) <= 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_EVP_LIB); goto err; } if (!WPACKET_allocate_bytes(pkt, enclen, &encdata) || EVP_PKEY_encrypt(pctx, encdata, &enclen, pms, pmslen) <= 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, SSL_R_BAD_RSA_ENCRYPT); goto err; } EVP_PKEY_CTX_free(pctx); pctx = NULL; # ifdef PKCS1_CHECK if (s->options & SSL_OP_PKCS1_CHECK_1) (*p)[1]++; if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0] = 0x70; # endif /* Fix buf for TLS and beyond */ if (s->version > SSL3_VERSION && !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR); goto err; } s->s3->tmp.pms = pms; s->s3->tmp.pmslen = pmslen; /* Log the premaster secret, if logging is enabled. */ if (!ssl_log_rsa_client_key_exchange(s, encdata, enclen, pms, pmslen)) goto err; return 1; err: OPENSSL_clear_free(pms, pmslen); EVP_PKEY_CTX_free(pctx); return 0; #else SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_construct_cke_dhe(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_DH DH *dh_clnt = NULL; const BIGNUM *pub_key; EVP_PKEY *ckey = NULL, *skey = NULL; unsigned char *keybytes = NULL; skey = s->s3->peer_tmp; if (skey == NULL) goto err; ckey = ssl_generate_pkey(skey); if (ckey == NULL) goto err; dh_clnt = EVP_PKEY_get0_DH(ckey); if (dh_clnt == NULL || ssl_derive(s, ckey, skey, 0) == 0) goto err; /* send off the data */ DH_get0_key(dh_clnt, &pub_key, NULL); if (!WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(pub_key), &keybytes)) goto err; BN_bn2bin(pub_key, keybytes); EVP_PKEY_free(ckey); return 1; err: EVP_PKEY_free(ckey); #endif SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; } static int tls_construct_cke_ecdhe(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_EC unsigned char *encodedPoint = NULL; size_t encoded_pt_len = 0; EVP_PKEY *ckey = NULL, *skey = NULL; int ret = 0; skey = s->s3->peer_tmp; if (skey == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR); return 0; } ckey = ssl_generate_pkey(skey); if (ckey == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_MALLOC_FAILURE); goto err; } if (ssl_derive(s, ckey, skey, 0) == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EVP_LIB); goto err; } /* Generate encoding of client key */ encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(ckey, &encodedPoint); if (encoded_pt_len == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EC_LIB); goto err; } if (!WPACKET_sub_memcpy_u8(pkt, encodedPoint, encoded_pt_len)) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR); goto err; } ret = 1; err: OPENSSL_free(encodedPoint); EVP_PKEY_free(ckey); return ret; #else SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_construct_cke_gost(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_GOST /* GOST key exchange message creation */ EVP_PKEY_CTX *pkey_ctx = NULL; X509 *peer_cert; size_t msglen; unsigned int md_len; unsigned char shared_ukm[32], tmp[256]; EVP_MD_CTX *ukm_hash = NULL; int dgst_nid = NID_id_GostR3411_94; unsigned char *pms = NULL; size_t pmslen = 0; if ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aGOST12) != 0) dgst_nid = NID_id_GostR3411_2012_256; /* * Get server sertificate PKEY and create ctx from it */ peer_cert = s->session->peer; if (!peer_cert) { *al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); return 0; } pkey_ctx = EVP_PKEY_CTX_new(X509_get0_pubkey(peer_cert), NULL); if (pkey_ctx == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE); return 0; } /* * If we have send a certificate, and certificate key * parameters match those of server certificate, use * certificate key for key exchange */ /* Otherwise, generate ephemeral key pair */ pmslen = 32; pms = OPENSSL_malloc(pmslen); if (pms == NULL) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE); goto err; } if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0 /* Generate session key * TODO(size_t): Convert this function */ || RAND_bytes(pms, (int)pmslen) <= 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR); goto err; }; /* * Compute shared IV and store it in algorithm-specific context * data */ ukm_hash = EVP_MD_CTX_new(); if (ukm_hash == NULL || EVP_DigestInit(ukm_hash, EVP_get_digestbynid(dgst_nid)) <= 0 || EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE) <= 0 || EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE) <= 0 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR); goto err; } EVP_MD_CTX_free(ukm_hash); ukm_hash = NULL; if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG); goto err; } /* Make GOST keytransport blob message */ /* * Encapsulate it into sequence */ msglen = 255; if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG); goto err; } if (!WPACKET_put_bytes_u8(pkt, V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED) || (msglen >= 0x80 && !WPACKET_put_bytes_u8(pkt, 0x81)) || !WPACKET_sub_memcpy_u8(pkt, tmp, msglen)) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR); goto err; } EVP_PKEY_CTX_free(pkey_ctx); s->s3->tmp.pms = pms; s->s3->tmp.pmslen = pmslen; return 1; err: EVP_PKEY_CTX_free(pkey_ctx); OPENSSL_clear_free(pms, pmslen); EVP_MD_CTX_free(ukm_hash); return 0; #else SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } static int tls_construct_cke_srp(SSL *s, WPACKET *pkt, int *al) { #ifndef OPENSSL_NO_SRP unsigned char *abytes = NULL; if (s->srp_ctx.A == NULL || !WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(s->srp_ctx.A), &abytes)) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR); return 0; } BN_bn2bin(s->srp_ctx.A, abytes); OPENSSL_free(s->session->srp_username); s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); if (s->session->srp_username == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_MALLOC_FAILURE); return 0; } return 1; #else SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR); *al = SSL_AD_INTERNAL_ERROR; return 0; #endif } int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt) { unsigned long alg_k; int al = -1; alg_k = s->s3->tmp.new_cipher->algorithm_mkey; if ((alg_k & SSL_PSK) && !tls_construct_cke_psk_preamble(s, pkt, &al)) goto err; if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { if (!tls_construct_cke_rsa(s, pkt, &al)) goto err; } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { if (!tls_construct_cke_dhe(s, pkt, &al)) goto err; } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { if (!tls_construct_cke_ecdhe(s, pkt, &al)) goto err; } else if (alg_k & SSL_kGOST) { if (!tls_construct_cke_gost(s, pkt, &al)) goto err; } else if (alg_k & SSL_kSRP) { if (!tls_construct_cke_srp(s, pkt, &al)) goto err; } else if (!(alg_k & SSL_kPSK)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } return 1; err: if (al != -1) ssl3_send_alert(s, SSL3_AL_FATAL, al); OPENSSL_clear_free(s->s3->tmp.pms, s->s3->tmp.pmslen); s->s3->tmp.pms = NULL; #ifndef OPENSSL_NO_PSK OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); s->s3->tmp.psk = NULL; #endif return 0; } int tls_client_key_exchange_post_work(SSL *s) { unsigned char *pms = NULL; size_t pmslen = 0; pms = s->s3->tmp.pms; pmslen = s->s3->tmp.pmslen; #ifndef OPENSSL_NO_SRP /* Check for SRP */ if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { if (!srp_generate_client_master_secret(s)) { SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_INTERNAL_ERROR); goto err; } return 1; } #endif if (pms == NULL && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_MALLOC_FAILURE); goto err; } if (!ssl_generate_master_secret(s, pms, pmslen, 1)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_INTERNAL_ERROR); /* ssl_generate_master_secret frees the pms even on error */ pms = NULL; pmslen = 0; goto err; } pms = NULL; pmslen = 0; #ifndef OPENSSL_NO_SCTP if (SSL_IS_DTLS(s)) { unsigned char sctpauthkey[64]; char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; /* * Add new shared key for SCTP-Auth, will be ignored if no SCTP * used. */ memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, sizeof(DTLS1_SCTP_AUTH_LABEL)); if (SSL_export_keying_material(s, sctpauthkey, sizeof(sctpauthkey), labelbuffer, sizeof(labelbuffer), NULL, 0, 0) <= 0) goto err; BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, sizeof(sctpauthkey), sctpauthkey); } #endif return 1; err: OPENSSL_clear_free(pms, pmslen); s->s3->tmp.pms = NULL; return 0; } /* * Check a certificate can be used for client authentication. Currently check * cert exists, if we have a suitable digest for TLS 1.2 if static DH client * certificates can be used and optionally checks suitability for Suite B. */ static int ssl3_check_client_certificate(SSL *s) { if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey) return 0; /* If no suitable signature algorithm can't use certificate */ if (SSL_USE_SIGALGS(s) && !s->s3->tmp.md[s->cert->key - s->cert->pkeys]) return 0; /* * If strict mode check suitability of chain before using it. This also * adjusts suite B digest if necessary. */ if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT && !tls1_check_chain(s, NULL, NULL, NULL, -2)) return 0; return 1; } WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst) { X509 *x509 = NULL; EVP_PKEY *pkey = NULL; int i; if (wst == WORK_MORE_A) { /* Let cert callback update client certificates if required */ if (s->cert->cert_cb) { i = s->cert->cert_cb(s, s->cert->cert_cb_arg); if (i < 0) { s->rwstate = SSL_X509_LOOKUP; return WORK_MORE_A; } if (i == 0) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); ossl_statem_set_error(s); return 0; } s->rwstate = SSL_NOTHING; } if (ssl3_check_client_certificate(s)) return WORK_FINISHED_CONTINUE; /* Fall through to WORK_MORE_B */ wst = WORK_MORE_B; } /* We need to get a client cert */ if (wst == WORK_MORE_B) { /* * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; * return(-1); We then get retied later */ i = ssl_do_client_cert_cb(s, &x509, &pkey); if (i < 0) { s->rwstate = SSL_X509_LOOKUP; return WORK_MORE_B; } s->rwstate = SSL_NOTHING; if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) i = 0; } else if (i == 1) { i = 0; SSLerr(SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); } X509_free(x509); EVP_PKEY_free(pkey); if (i && !ssl3_check_client_certificate(s)) i = 0; if (i == 0) { if (s->version == SSL3_VERSION) { s->s3->tmp.cert_req = 0; ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); return WORK_FINISHED_CONTINUE; } else { s->s3->tmp.cert_req = 2; if (!ssl3_digest_cached_records(s, 0)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); ossl_statem_set_error(s); return 0; } } } return WORK_FINISHED_CONTINUE; } /* Shouldn't ever get here */ return WORK_ERROR; } int tls_construct_client_certificate(SSL *s, WPACKET *pkt) { int al = SSL_AD_INTERNAL_ERROR; /* * TODO(TLS1.3): For now we must put an empty context. Needs to be filled in * later */ if ((SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0)) || !ssl3_output_cert_chain(s, pkt, (s->s3->tmp.cert_req == 2) ? NULL : s->cert->key, &al)) { SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); ssl3_send_alert(s, SSL3_AL_FATAL, al); return 0; } return 1; } #define has_bits(i,m) (((i)&(m)) == (m)) int ssl3_check_cert_and_algorithm(SSL *s) { int i; #ifndef OPENSSL_NO_EC int idx; #endif long alg_k, alg_a; EVP_PKEY *pkey = NULL; int al = SSL_AD_HANDSHAKE_FAILURE; alg_k = s->s3->tmp.new_cipher->algorithm_mkey; alg_a = s->s3->tmp.new_cipher->algorithm_auth; /* we don't have a certificate */ if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK)) return (1); /* This is the passed certificate */ #ifndef OPENSSL_NO_EC idx = s->session->peer_type; if (idx == SSL_PKEY_ECC) { if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s) == 0) { /* check failed */ SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT); goto f_err; } else { return 1; } } else if (alg_a & SSL_aECDSA) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDSA_SIGNING_CERT); goto f_err; } #endif pkey = X509_get0_pubkey(s->session->peer); i = X509_certificate_type(s->session->peer, pkey); /* Check that we have a certificate if we require one */ if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_RSA_SIGNING_CERT); goto f_err; } #ifndef OPENSSL_NO_DSA else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DSA_SIGNING_CERT); goto f_err; } #endif #ifndef OPENSSL_NO_RSA if (alg_k & (SSL_kRSA | SSL_kRSAPSK) && !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_RSA_ENCRYPTING_CERT); goto f_err; } #endif #ifndef OPENSSL_NO_DH if ((alg_k & SSL_kDHE) && (s->s3->peer_tmp == NULL)) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); goto f_err; } #endif return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); return (0); } #ifndef OPENSSL_NO_NEXTPROTONEG int tls_construct_next_proto(SSL *s, WPACKET *pkt) { size_t len, padding_len; unsigned char *padding = NULL; len = s->ext.npn_len; padding_len = 32 - ((len + 2) % 32); if (!WPACKET_sub_memcpy_u8(pkt, s->ext.npn, len) || !WPACKET_sub_allocate_bytes_u8(pkt, padding_len, &padding)) { SSLerr(SSL_F_TLS_CONSTRUCT_NEXT_PROTO, ERR_R_INTERNAL_ERROR); goto err; } memset(padding, 0, padding_len); return 1; err: ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); return 0; } #endif MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt) { if (PACKET_remaining(pkt) > 0) { /* should contain no data */ SSLerr(SSL_F_TLS_PROCESS_HELLO_REQ, SSL_R_LENGTH_MISMATCH); ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); ossl_statem_set_error(s); return MSG_PROCESS_ERROR; } /* * This is a historical discrepancy maintained for compatibility * reasons. If a TLS client receives a HelloRequest it will attempt * an abbreviated handshake. However if a DTLS client receives a * HelloRequest it will do a full handshake. */ if (SSL_IS_DTLS(s)) SSL_renegotiate(s); else SSL_renegotiate_abbreviated(s); return MSG_PROCESS_FINISHED_READING; } static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt) { int al = SSL_AD_INTERNAL_ERROR; PACKET extensions; RAW_EXTENSION *rawexts = NULL; if (!PACKET_as_length_prefixed_2(pkt, &extensions)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_TLS_PROCESS_ENCRYPTED_EXTENSIONS, SSL_R_LENGTH_MISMATCH); goto err; } if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_ENCRYPTED_EXTENSIONS, &rawexts, &al) || !tls_parse_all_extensions(s, EXT_TLS1_3_ENCRYPTED_EXTENSIONS, rawexts, NULL, 0, &al)) goto err; OPENSSL_free(rawexts); return MSG_PROCESS_CONTINUE_READING; err: ssl3_send_alert(s, SSL3_AL_FATAL, al); ossl_statem_set_error(s); OPENSSL_free(rawexts); return MSG_PROCESS_ERROR; } int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) { int i = 0; #ifndef OPENSSL_NO_ENGINE if (s->ctx->client_cert_engine) { i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); if (i != 0) return i; } #endif if (s->ctx->client_cert_cb) i = s->ctx->client_cert_cb(s, px509, ppkey); return i; } int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, WPACKET *pkt) { int i; size_t totlen = 0, len, maxlen; int empty_reneg_info_scsv = !s->renegotiate; /* Set disabled masks for this session */ ssl_set_client_disabled(s); if (sk == NULL) return (0); #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH # if OPENSSL_MAX_TLS1_2_CIPHER_LENGTH < 6 # error Max cipher length too short # endif /* * Some servers hang if client hello > 256 bytes as hack workaround * chop number of supported ciphers to keep it well below this if we * use TLS v1.2 */ if (TLS1_get_version(s) >= TLS1_2_VERSION) maxlen = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; else #endif /* Maximum length that can be stored in 2 bytes. Length must be even */ maxlen = 0xfffe; if (empty_reneg_info_scsv) maxlen -= 2; if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) maxlen -= 2; for (i = 0; i < sk_SSL_CIPHER_num(sk) && totlen < maxlen; i++) { const SSL_CIPHER *c; c = sk_SSL_CIPHER_value(sk, i); /* Skip disabled ciphers */ if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED)) continue; if (!s->method->put_cipher_by_char(c, pkt, &len)) { SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR); return 0; } totlen += len; } if (totlen == 0) { SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, SSL_R_NO_CIPHERS_AVAILABLE); return 0; } if (totlen != 0) { if (empty_reneg_info_scsv) { static SSL_CIPHER scsv = { 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) { SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR); return 0; } } if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) { static SSL_CIPHER scsv = { 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) { SSLerr(SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR); return 0; } } } return 1; }