| /* |
| * 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 <openssl/ssl.h> |
| |
| #include <assert.h> |
| #include <string.h> |
| |
| #include <openssl/bn.h> |
| #include <openssl/buf.h> |
| #include <openssl/dh.h> |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/md5.h> |
| #include <openssl/mem.h> |
| #include <openssl/rand.h> |
| |
| #include "internal.h" |
| |
| |
| static int dtls1_get_hello_verify(SSL *ssl); |
| |
| int dtls1_connect(SSL *ssl) { |
| BUF_MEM *buf = NULL; |
| void (*cb)(const SSL *ssl, int type, int value) = NULL; |
| int ret = -1; |
| int new_state, state, skip = 0; |
| |
| assert(ssl->handshake_func == dtls1_connect); |
| assert(!ssl->server); |
| assert(SSL_IS_DTLS(ssl)); |
| |
| ERR_clear_system_error(); |
| |
| if (ssl->info_callback != NULL) { |
| cb = ssl->info_callback; |
| } else if (ssl->ctx->info_callback != NULL) { |
| cb = ssl->ctx->info_callback; |
| } |
| |
| for (;;) { |
| state = ssl->state; |
| |
| switch (ssl->state) { |
| case SSL_ST_CONNECT: |
| if (cb != NULL) { |
| cb(ssl, SSL_CB_HANDSHAKE_START, 1); |
| } |
| |
| if (ssl->init_buf == NULL) { |
| buf = BUF_MEM_new(); |
| if (buf == NULL || |
| !BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { |
| ret = -1; |
| goto end; |
| } |
| ssl->init_buf = buf; |
| buf = NULL; |
| } |
| |
| if (!ssl_init_wbio_buffer(ssl, 0)) { |
| ret = -1; |
| goto end; |
| } |
| |
| /* don't push the buffering BIO quite yet */ |
| |
| ssl->state = SSL3_ST_CW_CLNT_HELLO_A; |
| ssl->init_num = 0; |
| ssl->d1->send_cookie = 0; |
| ssl->hit = 0; |
| break; |
| |
| case SSL3_ST_CW_CLNT_HELLO_A: |
| case SSL3_ST_CW_CLNT_HELLO_B: |
| ssl->shutdown = 0; |
| dtls1_start_timer(ssl); |
| ret = ssl3_send_client_hello(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| |
| if (ssl->d1->send_cookie) { |
| ssl->state = SSL3_ST_CW_FLUSH; |
| ssl->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; |
| } else { |
| ssl->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; |
| } |
| |
| ssl->init_num = 0; |
| /* turn on buffering for the next lot of output */ |
| if (ssl->bbio != ssl->wbio) { |
| ssl->wbio = BIO_push(ssl->bbio, ssl->wbio); |
| } |
| |
| break; |
| |
| case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: |
| case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: |
| ret = dtls1_get_hello_verify(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| if (ssl->d1->send_cookie) { |
| /* start again, with a cookie */ |
| dtls1_stop_timer(ssl); |
| ssl->state = SSL3_ST_CW_CLNT_HELLO_A; |
| } else { |
| ssl->state = SSL3_ST_CR_SRVR_HELLO_A; |
| } |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_SRVR_HELLO_A: |
| case SSL3_ST_CR_SRVR_HELLO_B: |
| ret = ssl3_get_server_hello(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| |
| if (ssl->hit) { |
| ssl->state = SSL3_ST_CR_CHANGE; |
| if (ssl->tlsext_ticket_expected) { |
| /* receive renewed session ticket */ |
| ssl->state = SSL3_ST_CR_SESSION_TICKET_A; |
| } |
| } else { |
| ssl->state = SSL3_ST_CR_CERT_A; |
| } |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_CERT_A: |
| case SSL3_ST_CR_CERT_B: |
| if (ssl_cipher_has_server_public_key(ssl->s3->tmp.new_cipher)) { |
| ret = ssl3_get_server_certificate(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| if (ssl->s3->tmp.certificate_status_expected) { |
| ssl->state = SSL3_ST_CR_CERT_STATUS_A; |
| } else { |
| ssl->state = SSL3_ST_VERIFY_SERVER_CERT; |
| } |
| } else { |
| skip = 1; |
| ssl->state = SSL3_ST_CR_KEY_EXCH_A; |
| } |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_VERIFY_SERVER_CERT: |
| ret = ssl3_verify_server_cert(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| |
| ssl->state = SSL3_ST_CR_KEY_EXCH_A; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_KEY_EXCH_A: |
| case SSL3_ST_CR_KEY_EXCH_B: |
| ret = ssl3_get_server_key_exchange(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CR_CERT_REQ_A; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_CERT_REQ_A: |
| case SSL3_ST_CR_CERT_REQ_B: |
| ret = ssl3_get_certificate_request(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CR_SRVR_DONE_A; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_SRVR_DONE_A: |
| case SSL3_ST_CR_SRVR_DONE_B: |
| ret = ssl3_get_server_done(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| dtls1_stop_timer(ssl); |
| if (ssl->s3->tmp.cert_req) { |
| ssl->s3->tmp.next_state = SSL3_ST_CW_CERT_A; |
| } else { |
| ssl->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; |
| } |
| ssl->init_num = 0; |
| ssl->state = ssl->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(ssl); |
| ret = ssl3_send_client_certificate(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CW_KEY_EXCH_A; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CW_KEY_EXCH_A: |
| case SSL3_ST_CW_KEY_EXCH_B: |
| dtls1_start_timer(ssl); |
| ret = ssl3_send_client_key_exchange(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| /* For TLS, cert_req is set to 2, so a cert chain |
| * of nothing is sent, but no verify packet is sent */ |
| if (ssl->s3->tmp.cert_req == 1) { |
| ssl->state = SSL3_ST_CW_CERT_VRFY_A; |
| } else { |
| ssl->state = SSL3_ST_CW_CHANGE_A; |
| } |
| |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CW_CERT_VRFY_A: |
| case SSL3_ST_CW_CERT_VRFY_B: |
| case SSL3_ST_CW_CERT_VRFY_C: |
| dtls1_start_timer(ssl); |
| ret = ssl3_send_cert_verify(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CW_CHANGE_A; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CW_CHANGE_A: |
| case SSL3_ST_CW_CHANGE_B: |
| if (!ssl->hit) { |
| dtls1_start_timer(ssl); |
| } |
| ret = dtls1_send_change_cipher_spec(ssl, SSL3_ST_CW_CHANGE_A, |
| SSL3_ST_CW_CHANGE_B); |
| if (ret <= 0) { |
| goto end; |
| } |
| |
| ssl->state = SSL3_ST_CW_FINISHED_A; |
| ssl->init_num = 0; |
| |
| if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { |
| ret = -1; |
| goto end; |
| } |
| break; |
| |
| case SSL3_ST_CW_FINISHED_A: |
| case SSL3_ST_CW_FINISHED_B: |
| if (!ssl->hit) { |
| dtls1_start_timer(ssl); |
| } |
| |
| ret = ssl3_send_finished(ssl, SSL3_ST_CW_FINISHED_A, |
| SSL3_ST_CW_FINISHED_B); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CW_FLUSH; |
| |
| if (ssl->hit) { |
| ssl->s3->tmp.next_state = SSL_ST_OK; |
| } else { |
| /* Allow NewSessionTicket if ticket expected */ |
| if (ssl->tlsext_ticket_expected) { |
| ssl->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; |
| } else { |
| ssl->s3->tmp.next_state = SSL3_ST_CR_CHANGE; |
| } |
| } |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_SESSION_TICKET_A: |
| case SSL3_ST_CR_SESSION_TICKET_B: |
| ret = ssl3_get_new_session_ticket(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_CR_CHANGE; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_CERT_STATUS_A: |
| case SSL3_ST_CR_CERT_STATUS_B: |
| ret = ssl3_get_cert_status(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| ssl->state = SSL3_ST_VERIFY_SERVER_CERT; |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_CHANGE: |
| ret = ssl->method->ssl_read_change_cipher_spec(ssl); |
| if (ret <= 0) { |
| goto end; |
| } |
| |
| if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_CLIENT_READ)) { |
| ret = -1; |
| goto end; |
| } |
| ssl->state = SSL3_ST_CR_FINISHED_A; |
| break; |
| |
| case SSL3_ST_CR_FINISHED_A: |
| case SSL3_ST_CR_FINISHED_B: |
| ret = |
| ssl3_get_finished(ssl, SSL3_ST_CR_FINISHED_A, SSL3_ST_CR_FINISHED_B); |
| if (ret <= 0) { |
| goto end; |
| } |
| dtls1_stop_timer(ssl); |
| |
| if (ssl->hit) { |
| ssl->state = SSL3_ST_CW_CHANGE_A; |
| } else { |
| ssl->state = SSL_ST_OK; |
| } |
| |
| ssl->init_num = 0; |
| break; |
| |
| case SSL3_ST_CW_FLUSH: |
| if (BIO_flush(ssl->wbio) <= 0) { |
| ssl->rwstate = SSL_WRITING; |
| ret = -1; |
| goto end; |
| } |
| ssl->state = ssl->s3->tmp.next_state; |
| break; |
| |
| case SSL_ST_OK: |
| /* clean a few things up */ |
| ssl3_cleanup_key_block(ssl); |
| |
| /* Remove write buffering now. */ |
| ssl_free_wbio_buffer(ssl); |
| |
| ssl->init_num = 0; |
| ssl->s3->initial_handshake_complete = 1; |
| |
| ssl_update_cache(ssl, SSL_SESS_CACHE_CLIENT); |
| |
| ret = 1; |
| |
| if (cb != NULL) { |
| cb(ssl, SSL_CB_HANDSHAKE_DONE, 1); |
| } |
| |
| /* done with handshaking */ |
| ssl->d1->handshake_read_seq = 0; |
| ssl->d1->next_handshake_write_seq = 0; |
| goto end; |
| |
| default: |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE); |
| ret = -1; |
| goto end; |
| } |
| |
| /* did we do anything? */ |
| if (!ssl->s3->tmp.reuse_message && !skip) { |
| if ((cb != NULL) && (ssl->state != state)) { |
| new_state = ssl->state; |
| ssl->state = state; |
| cb(ssl, SSL_CB_CONNECT_LOOP, 1); |
| ssl->state = new_state; |
| } |
| } |
| skip = 0; |
| } |
| |
| end: |
| BUF_MEM_free(buf); |
| if (cb != NULL) { |
| cb(ssl, SSL_CB_CONNECT_EXIT, ret); |
| } |
| return ret; |
| } |
| |
| static int dtls1_get_hello_verify(SSL *ssl) { |
| long n; |
| int al, ok = 0; |
| CBS hello_verify_request, cookie; |
| uint16_t server_version; |
| |
| n = ssl->method->ssl_get_message( |
| ssl, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, |
| DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, |
| /* Use the same maximum size as ssl3_get_server_hello. */ |
| 20000, ssl_hash_message, &ok); |
| |
| if (!ok) { |
| return n; |
| } |
| |
| if (ssl->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { |
| ssl->d1->send_cookie = 0; |
| ssl->s3->tmp.reuse_message = 1; |
| return 1; |
| } |
| |
| CBS_init(&hello_verify_request, ssl->init_msg, n); |
| |
| if (!CBS_get_u16(&hello_verify_request, &server_version) || |
| !CBS_get_u8_length_prefixed(&hello_verify_request, &cookie) || |
| CBS_len(&hello_verify_request) != 0) { |
| al = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| goto f_err; |
| } |
| |
| if (CBS_len(&cookie) > sizeof(ssl->d1->cookie)) { |
| al = SSL_AD_ILLEGAL_PARAMETER; |
| goto f_err; |
| } |
| |
| memcpy(ssl->d1->cookie, CBS_data(&cookie), CBS_len(&cookie)); |
| ssl->d1->cookie_len = CBS_len(&cookie); |
| |
| ssl->d1->send_cookie = 1; |
| return 1; |
| |
| f_err: |
| ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
| return -1; |
| } |
