/* $OpenBSD: d1_clnt.c,v 1.59 2016/12/06 13:38:11 jsing Exp $ */ /* * DTLS implementation written by Nagendra Modadugu * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */ /* ==================================================================== * Copyright (c) 1999-2007 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 (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.] */ #include #include #include "ssl_locl.h" #include #include #include #include #include #include #include "bytestring.h" static const SSL_METHOD *dtls1_get_client_method(int ver); static int dtls1_get_hello_verify(SSL *s); static const SSL_METHOD DTLSv1_client_method_data = { .version = DTLS1_VERSION, .ssl_new = dtls1_new, .ssl_clear = dtls1_clear, .ssl_free = dtls1_free, .ssl_accept = ssl_undefined_function, .ssl_connect = dtls1_connect, .ssl_read = ssl3_read, .ssl_peek = ssl3_peek, .ssl_write = ssl3_write, .ssl_shutdown = dtls1_shutdown, .ssl_renegotiate = ssl3_renegotiate, .ssl_renegotiate_check = ssl3_renegotiate_check, .ssl_get_message = dtls1_get_message, .ssl_read_bytes = dtls1_read_bytes, .ssl_write_bytes = dtls1_write_app_data_bytes, .ssl_dispatch_alert = dtls1_dispatch_alert, .ssl_ctrl = dtls1_ctrl, .ssl_ctx_ctrl = ssl3_ctx_ctrl, .get_cipher_by_char = ssl3_get_cipher_by_char, .put_cipher_by_char = ssl3_put_cipher_by_char, .ssl_pending = ssl3_pending, .num_ciphers = ssl3_num_ciphers, .get_cipher = dtls1_get_cipher, .get_ssl_method = dtls1_get_client_method, .get_timeout = dtls1_default_timeout, .ssl3_enc = &DTLSv1_enc_data, .ssl_version = ssl_undefined_void_function, .ssl_callback_ctrl = ssl3_callback_ctrl, .ssl_ctx_callback_ctrl = ssl3_ctx_callback_ctrl, }; const SSL_METHOD * DTLSv1_client_method(void) { return &DTLSv1_client_method_data; } static const SSL_METHOD * dtls1_get_client_method(int ver) { if (ver == DTLS1_VERSION) return (DTLSv1_client_method()); return (NULL); } int dtls1_connect(SSL *s) { void (*cb)(const SSL *ssl, int type, int val) = NULL; int ret = -1; int new_state, state, skip = 0; ERR_clear_error(); errno = 0; if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); for (;;) { state = s->state; switch (s->state) { case SSL_ST_RENEGOTIATE: s->renegotiate = 1; s->state = SSL_ST_CONNECT; s->ctx->stats.sess_connect_renegotiate++; /* break */ case SSL_ST_BEFORE: case SSL_ST_CONNECT: case SSL_ST_BEFORE|SSL_ST_CONNECT: case SSL_ST_OK|SSL_ST_CONNECT: s->server = 0; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_START, 1); if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00)) { SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); ret = -1; goto end; } /* s->version=SSL3_VERSION; */ s->type = SSL_ST_CONNECT; if (!ssl3_setup_init_buffer(s)) { ret = -1; goto end; } if (!ssl3_setup_buffers(s)) { ret = -1; goto end; } if (!ssl_init_wbio_buffer(s, 0)) { ret = -1; goto end; } /* don't push the buffering BIO quite yet */ s->state = SSL3_ST_CW_CLNT_HELLO_A; s->ctx->stats.sess_connect++; s->init_num = 0; /* mark client_random uninitialized */ memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); s->d1->send_cookie = 0; s->hit = 0; break; case SSL3_ST_CW_CLNT_HELLO_A: case SSL3_ST_CW_CLNT_HELLO_B: s->shutdown = 0; /* every DTLS ClientHello resets Finished MAC */ if (!tls1_init_finished_mac(s)) { ret = -1; goto end; } dtls1_start_timer(s); ret = ssl3_client_hello(s); if (ret <= 0) goto end; if (s->d1->send_cookie) { s->state = SSL3_ST_CW_FLUSH; s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; } else s->state = SSL3_ST_CR_SRVR_HELLO_A; s->init_num = 0; /* turn on buffering for the next lot of output */ if (s->bbio != s->wbio) s->wbio = BIO_push(s->bbio, s->wbio); break; case SSL3_ST_CR_SRVR_HELLO_A: case SSL3_ST_CR_SRVR_HELLO_B: ret = ssl3_get_server_hello(s); if (ret <= 0) goto end; else { if (s->hit) { s->state = SSL3_ST_CR_FINISHED_A; } else s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; } s->init_num = 0; break; case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: ret = dtls1_get_hello_verify(s); if (ret <= 0) goto end; dtls1_stop_timer(s); if ( s->d1->send_cookie) /* start again, with a cookie */ s->state = SSL3_ST_CW_CLNT_HELLO_A; else s->state = SSL3_ST_CR_CERT_A; s->init_num = 0; break; case SSL3_ST_CR_CERT_A: case SSL3_ST_CR_CERT_B: ret = ssl3_check_finished(s); if (ret <= 0) goto end; if (ret == 2) { s->hit = 1; if (s->tlsext_ticket_expected) s->state = SSL3_ST_CR_SESSION_TICKET_A; else s->state = SSL3_ST_CR_FINISHED_A; s->init_num = 0; break; } /* Check if it is anon DH. */ if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) { ret = ssl3_get_server_certificate(s); if (ret <= 0) goto end; if (s->tlsext_status_expected) s->state = SSL3_ST_CR_CERT_STATUS_A; else s->state = SSL3_ST_CR_KEY_EXCH_A; } else { skip = 1; s->state = SSL3_ST_CR_KEY_EXCH_A; } s->init_num = 0; break; case SSL3_ST_CR_KEY_EXCH_A: case SSL3_ST_CR_KEY_EXCH_B: ret = ssl3_get_server_key_exchange(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_CERT_REQ_A; s->init_num = 0; /* at this point we check that we have the * required stuff from the server */ if (!ssl3_check_cert_and_algorithm(s)) { ret = -1; goto end; } break; case SSL3_ST_CR_CERT_REQ_A: case SSL3_ST_CR_CERT_REQ_B: ret = ssl3_get_certificate_request(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_SRVR_DONE_A; s->init_num = 0; break; case SSL3_ST_CR_SRVR_DONE_A: case SSL3_ST_CR_SRVR_DONE_B: ret = ssl3_get_server_done(s); if (ret <= 0) goto end; dtls1_stop_timer(s); if (s->s3->tmp.cert_req) s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; else s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; s->init_num = 0; s->state = s->s3->tmp.next_state; break; case SSL3_ST_CW_CERT_A: case SSL3_ST_CW_CERT_B: case SSL3_ST_CW_CERT_C: case SSL3_ST_CW_CERT_D: dtls1_start_timer(s); ret = ssl3_send_client_certificate(s); if (ret <= 0) goto end; s->state = SSL3_ST_CW_KEY_EXCH_A; s->init_num = 0; break; case SSL3_ST_CW_KEY_EXCH_A: case SSL3_ST_CW_KEY_EXCH_B: dtls1_start_timer(s); ret = ssl3_send_client_key_exchange(s); if (ret <= 0) goto end; /* EAY EAY EAY need to check for DH fix cert * sent back */ /* For TLS, cert_req is set to 2, so a cert chain * of nothing is sent, but no verify packet is sent */ if (s->s3->tmp.cert_req == 1) { s->state = SSL3_ST_CW_CERT_VRFY_A; } else { s->state = SSL3_ST_CW_CHANGE_A; s->s3->change_cipher_spec = 0; } s->init_num = 0; break; case SSL3_ST_CW_CERT_VRFY_A: case SSL3_ST_CW_CERT_VRFY_B: dtls1_start_timer(s); ret = ssl3_send_client_verify(s); if (ret <= 0) goto end; s->state = SSL3_ST_CW_CHANGE_A; s->init_num = 0; s->s3->change_cipher_spec = 0; break; case SSL3_ST_CW_CHANGE_A: case SSL3_ST_CW_CHANGE_B: if (!s->hit) dtls1_start_timer(s); ret = dtls1_send_change_cipher_spec(s, SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); if (ret <= 0) goto end; s->state = SSL3_ST_CW_FINISHED_A; s->init_num = 0; s->session->cipher = s->s3->tmp.new_cipher; if (!s->method->ssl3_enc->setup_key_block(s)) { ret = -1; goto end; } if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { ret = -1; goto end; } dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); break; case SSL3_ST_CW_FINISHED_A: case SSL3_ST_CW_FINISHED_B: if (!s->hit) dtls1_start_timer(s); ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, SSL3_ST_CW_FINISHED_B, s->method->ssl3_enc->client_finished_label, s->method->ssl3_enc->client_finished_label_len); if (ret <= 0) goto end; s->state = SSL3_ST_CW_FLUSH; /* clear flags */ s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; if (s->hit) { s->s3->tmp.next_state = SSL_ST_OK; if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { s->state = SSL_ST_OK; s->s3->flags |= SSL3_FLAGS_POP_BUFFER; s->s3->delay_buf_pop_ret = 0; } } else { /* Allow NewSessionTicket if ticket expected */ if (s->tlsext_ticket_expected) s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; else s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; } s->init_num = 0; break; case SSL3_ST_CR_SESSION_TICKET_A: case SSL3_ST_CR_SESSION_TICKET_B: ret = ssl3_get_new_session_ticket(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_FINISHED_A; s->init_num = 0; break; case SSL3_ST_CR_CERT_STATUS_A: case SSL3_ST_CR_CERT_STATUS_B: ret = ssl3_get_cert_status(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_KEY_EXCH_A; s->init_num = 0; break; case SSL3_ST_CR_FINISHED_A: case SSL3_ST_CR_FINISHED_B: s->d1->change_cipher_spec_ok = 1; ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, SSL3_ST_CR_FINISHED_B); if (ret <= 0) goto end; dtls1_stop_timer(s); if (s->hit) s->state = SSL3_ST_CW_CHANGE_A; else s->state = SSL_ST_OK; s->init_num = 0; break; case SSL3_ST_CW_FLUSH: s->rwstate = SSL_WRITING; if (BIO_flush(s->wbio) <= 0) { /* If the write error was fatal, stop trying */ if (!BIO_should_retry(s->wbio)) { s->rwstate = SSL_NOTHING; s->state = s->s3->tmp.next_state; } ret = -1; goto end; } s->rwstate = SSL_NOTHING; s->state = s->s3->tmp.next_state; break; case SSL_ST_OK: /* clean a few things up */ tls1_cleanup_key_block(s); /* If we are not 'joining' the last two packets, * remove the buffering now */ if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) ssl_free_wbio_buffer(s); /* else do it later in ssl3_write */ s->init_num = 0; s->renegotiate = 0; s->new_session = 0; ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); if (s->hit) s->ctx->stats.sess_hit++; ret = 1; /* s->server=0; */ s->handshake_func = dtls1_connect; s->ctx->stats.sess_connect_good++; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_DONE, 1); /* done with handshaking */ s->d1->handshake_read_seq = 0; s->d1->next_handshake_write_seq = 0; goto end; /* break; */ default: SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); ret = -1; goto end; /* break; */ } /* did we do anything */ if (!s->s3->tmp.reuse_message && !skip) { if (s->debug) { if ((ret = BIO_flush(s->wbio)) <= 0) goto end; } if ((cb != NULL) && (s->state != state)) { new_state = s->state; s->state = state; cb(s, SSL_CB_CONNECT_LOOP, 1); s->state = new_state; } } skip = 0; } end: s->in_handshake--; if (cb != NULL) cb(s, SSL_CB_CONNECT_EXIT, ret); return (ret); } static int dtls1_get_hello_verify(SSL *s) { long n; int al, ok = 0; size_t cookie_len; uint16_t ssl_version; CBS hello_verify_request, cookie; n = s->method->ssl_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->max_cert_list, &ok); if (!ok) return ((int)n); if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { s->d1->send_cookie = 0; s->s3->tmp.reuse_message = 1; return (1); } if (n < 0) goto truncated; CBS_init(&hello_verify_request, s->init_msg, n); if (!CBS_get_u16(&hello_verify_request, &ssl_version)) goto truncated; if (ssl_version != s->version) { SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); s->version = (s->version & 0xff00) | (ssl_version & 0xff); al = SSL_AD_PROTOCOL_VERSION; goto f_err; } if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) goto truncated; if (!CBS_write_bytes(&cookie, s->d1->cookie, sizeof(s->d1->cookie), &cookie_len)) { s->d1->cookie_len = 0; al = SSL_AD_ILLEGAL_PARAMETER; goto f_err; } s->d1->cookie_len = cookie_len; s->d1->send_cookie = 1; return 1; truncated: al = SSL_AD_DECODE_ERROR; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); return -1; }