diff options
Diffstat (limited to 'src/ssl/d1_clnt.c')
| -rw-r--r-- | src/ssl/d1_clnt.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/src/ssl/d1_clnt.c b/src/ssl/d1_clnt.c new file mode 100644 index 0000000..3f9e814 --- /dev/null +++ b/src/ssl/d1_clnt.c @@ -0,0 +1,577 @@ +/* + * 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 <assert.h> +#include <stdio.h> + +#include <openssl/bn.h> +#include <openssl/buf.h> +#include <openssl/dh.h> +#include <openssl/evp.h> +#include <openssl/md5.h> +#include <openssl/mem.h> +#include <openssl/obj.h> +#include <openssl/rand.h> + +#include "ssl_locl.h" + +static int dtls1_get_hello_verify(SSL *s); + +int dtls1_connect(SSL *s) { + BUF_MEM *buf = NULL; + void (*cb)(const SSL *ssl, int type, int val) = NULL; + int ret = -1; + int new_state, state, skip = 0; + + assert(s->handshake_func == dtls1_connect); + assert(!s->server); + assert(SSL_IS_DTLS(s)); + + ERR_clear_error(); + ERR_clear_system_error(); + + if (s->info_callback != NULL) { + cb = s->info_callback; + } else if (s->ctx->info_callback != NULL) { + cb = s->ctx->info_callback; + } + + s->in_handshake++; + + 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_CONNECT: + case SSL_ST_BEFORE | SSL_ST_CONNECT: + if (cb != NULL) { + cb(s, SSL_CB_HANDSHAKE_START, 1); + } + + if (s->init_buf == NULL) { + buf = BUF_MEM_new(); + if (buf == NULL || + !BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { + ret = -1; + goto end; + } + s->init_buf = buf; + buf = NULL; + } + + if (!ssl3_setup_buffers(s) || + !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; + 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 (!ssl3_init_finished_mac(s)) { + OPENSSL_PUT_ERROR(SSL, dtls1_connect, ERR_R_INTERNAL_ERROR); + ret = -1; + goto end; + } + + dtls1_start_timer(s); + ret = ssl3_send_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 = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_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 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; + } + if (s->d1->send_cookie) { + /* start again, with a cookie */ + dtls1_stop_timer(s); + s->state = SSL3_ST_CW_CLNT_HELLO_A; + } else { + s->state = SSL3_ST_CR_SRVR_HELLO_A; + } + s->init_num = 0; + 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; + } + + if (s->hit) { + s->state = SSL3_ST_CR_FINISHED_A; + if (s->tlsext_ticket_expected) { + /* receive renewed session ticket */ + s->state = SSL3_ST_CR_SESSION_TICKET_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: + if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) { + ret = ssl3_get_server_certificate(s); + if (ret <= 0) { + goto end; + } + if (s->s3->tmp.certificate_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; + } + /* 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_cert_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->enc_method->setup_key_block(s) || + !s->enc_method->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->enc_method->client_finished_label, + s->enc_method->client_finished_label_len); + if (ret <= 0) { + goto end; + } + s->state = SSL3_ST_CW_FLUSH; + + if (s->hit) { + s->s3->tmp.next_state = SSL_ST_OK; + } 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 */ + ssl3_cleanup_key_block(s); + + /* Remove write buffering now. */ + ssl_free_wbio_buffer(s); + + 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->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; + + default: + OPENSSL_PUT_ERROR(SSL, dtls1_connect, SSL_R_UNKNOWN_STATE); + ret = -1; + goto end; + } + + /* did we do anything? */ + if (!s->s3->tmp.reuse_message && !skip) { + 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 (buf != NULL) { + BUF_MEM_free(buf); + } + 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; + CBS hello_verify_request, cookie; + uint16_t server_version; + + n = s->method->ssl_get_message( + s, 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_GET_MESSAGE_HASH_MESSAGE, &ok); + + if (!ok) { + return 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; + } + + CBS_init(&hello_verify_request, s->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, ssl3_get_cert_status, SSL_R_DECODE_ERROR); + goto f_err; + } + + if (CBS_len(&cookie) > sizeof(s->d1->cookie)) { + al = SSL_AD_ILLEGAL_PARAMETER; + goto f_err; + } + + memcpy(s->d1->cookie, CBS_data(&cookie), CBS_len(&cookie)); + s->d1->cookie_len = CBS_len(&cookie); + + s->d1->send_cookie = 1; + return 1; + +f_err: + ssl3_send_alert(s, SSL3_AL_FATAL, al); + return -1; +} |