| /* ssl/d1_clnt.c */ |
| /* |
| * 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 <stdio.h> |
| #include "ssl_locl.h" |
| #ifndef OPENSSL_NO_KRB5 |
| # include "kssl_lcl.h" |
| #endif |
| #include <openssl/buffer.h> |
| #include <openssl/rand.h> |
| #include <openssl/objects.h> |
| #include <openssl/evp.h> |
| #include <openssl/md5.h> |
| #include <openssl/bn.h> |
| #ifndef OPENSSL_NO_DH |
| # include <openssl/dh.h> |
| #endif |
| |
| static const SSL_METHOD *dtls1_get_client_method(int ver); |
| static int dtls1_get_hello_verify(SSL *s); |
| |
| static const SSL_METHOD *dtls1_get_client_method(int ver) |
| { |
| if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) |
| return (DTLSv1_client_method()); |
| else |
| return (NULL); |
| } |
| |
| IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, |
| ssl_undefined_function, |
| dtls1_connect, dtls1_get_client_method) |
| |
| int dtls1_connect(SSL *s) |
| { |
| BUF_MEM *buf = NULL; |
| unsigned long Time = (unsigned long)time(NULL); |
| void (*cb) (const SSL *ssl, int type, int val) = NULL; |
| int ret = -1; |
| int new_state, state, skip = 0; |
| #ifndef OPENSSL_NO_SCTP |
| unsigned char sctpauthkey[64]; |
| char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; |
| #endif |
| |
| RAND_add(&Time, sizeof(Time), 0); |
| ERR_clear_error(); |
| clear_sys_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++; |
| if (!SSL_in_init(s) || SSL_in_before(s)) |
| SSL_clear(s); |
| |
| #ifndef OPENSSL_NO_SCTP |
| /* |
| * Notify SCTP BIO socket to enter handshake mode and prevent stream |
| * identifier other than 0. Will be ignored if no SCTP is used. |
| */ |
| BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, |
| s->in_handshake, NULL); |
| #endif |
| |
| #ifndef OPENSSL_NO_HEARTBEATS |
| /* |
| * If we're awaiting a HeartbeatResponse, pretend we already got and |
| * don't await it anymore, because Heartbeats don't make sense during |
| * handshakes anyway. |
| */ |
| if (s->tlsext_hb_pending) { |
| dtls1_stop_timer(s); |
| s->tlsext_hb_pending = 0; |
| s->tlsext_hb_seq++; |
| } |
| #endif |
| |
| 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) && |
| (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) { |
| SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| |
| /* s->version=SSL3_VERSION; */ |
| s->type = SSL_ST_CONNECT; |
| |
| if (s->init_buf == NULL) { |
| if ((buf = BUF_MEM_new()) == NULL) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| s->init_buf = buf; |
| buf = NULL; |
| } |
| |
| if (!ssl3_setup_buffers(s)) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| |
| /* setup buffing BIO */ |
| if (!ssl_init_wbio_buffer(s, 0)) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| 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; |
| s->d1->change_cipher_spec_ok = 0; |
| /* |
| * Should have been reset by ssl3_get_finished, too. |
| */ |
| s->s3->change_cipher_spec = 0; |
| break; |
| |
| #ifndef OPENSSL_NO_SCTP |
| case DTLS1_SCTP_ST_CR_READ_SOCK: |
| |
| 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)); |
| ret = -1; |
| goto end; |
| } |
| |
| s->state = s->s3->tmp.next_state; |
| break; |
| |
| case DTLS1_SCTP_ST_CW_WRITE_SOCK: |
| /* read app data until dry event */ |
| |
| ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); |
| if (ret < 0) |
| goto end; |
| |
| if (ret == 0) { |
| 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)); |
| ret = -1; |
| goto end; |
| } |
| |
| s->state = s->d1->next_state; |
| break; |
| #endif |
| |
| case SSL3_ST_CW_CLNT_HELLO_A: |
| s->shutdown = 0; |
| |
| /* every DTLS ClientHello resets Finished MAC */ |
| ssl3_init_finished_mac(s); |
| |
| case SSL3_ST_CW_CLNT_HELLO_B: |
| dtls1_start_timer(s); |
| ret = dtls1_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; |
| |
| #ifndef OPENSSL_NO_SCTP |
| /* Disable buffering for SCTP */ |
| if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { |
| #endif |
| /* |
| * turn on buffering for the next lot of output |
| */ |
| if (s->bbio != s->wbio) |
| s->wbio = BIO_push(s->bbio, s->wbio); |
| #ifndef OPENSSL_NO_SCTP |
| } |
| #endif |
| |
| 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) { |
| #ifndef OPENSSL_NO_SCTP |
| /* |
| * Add new shared key for SCTP-Auth, will be ignored if |
| * no SCTP used. |
| */ |
| snprintf((char *)labelbuffer, |
| sizeof(DTLS1_SCTP_AUTH_LABEL), |
| DTLS1_SCTP_AUTH_LABEL); |
| |
| if (SSL_export_keying_material(s, sctpauthkey, |
| sizeof(sctpauthkey), |
| labelbuffer, |
| sizeof(labelbuffer), NULL, 0, |
| 0) <= 0) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| |
| BIO_ctrl(SSL_get_wbio(s), |
| BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
| sizeof(sctpauthkey), sctpauthkey); |
| #endif |
| |
| 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 = 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: |
| /* Check if it is anon DH or PSK */ |
| if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && |
| !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { |
| ret = ssl3_get_server_certificate(s); |
| if (ret <= 0) |
| goto end; |
| #ifndef OPENSSL_NO_TLSEXT |
| 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; |
| } |
| #else |
| } else |
| skip = 1; |
| |
| s->state = SSL3_ST_CR_KEY_EXCH_A; |
| #endif |
| s->init_num = 0; |
| break; |
| |
| case SSL3_ST_CR_KEY_EXCH_A: |
| case SSL3_ST_CR_KEY_EXCH_B: |
| ret = ssl3_get_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; |
| s->state = SSL_ST_ERR; |
| 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; |
| |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && |
| state == SSL_ST_RENEGOTIATE) |
| s->state = DTLS1_SCTP_ST_CR_READ_SOCK; |
| else |
| #endif |
| 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 = dtls1_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 = dtls1_send_client_key_exchange(s); |
| if (ret <= 0) |
| goto end; |
| |
| #ifndef OPENSSL_NO_SCTP |
| /* |
| * Add new shared key for SCTP-Auth, will be ignored if no SCTP |
| * used. |
| */ |
| snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), |
| DTLS1_SCTP_AUTH_LABEL); |
| |
| if (SSL_export_keying_material(s, sctpauthkey, |
| sizeof(sctpauthkey), labelbuffer, |
| sizeof(labelbuffer), NULL, 0, 0) <= 0) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| |
| BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
| sizeof(sctpauthkey), sctpauthkey); |
| #endif |
| |
| /* |
| * 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 { |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { |
| s->d1->next_state = SSL3_ST_CW_CHANGE_A; |
| s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; |
| } else |
| #endif |
| s->state = SSL3_ST_CW_CHANGE_A; |
| } |
| |
| s->init_num = 0; |
| break; |
| |
| case SSL3_ST_CW_CERT_VRFY_A: |
| case SSL3_ST_CW_CERT_VRFY_B: |
| dtls1_start_timer(s); |
| ret = dtls1_send_client_verify(s); |
| if (ret <= 0) |
| goto end; |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { |
| s->d1->next_state = SSL3_ST_CW_CHANGE_A; |
| s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; |
| } else |
| #endif |
| s->state = SSL3_ST_CW_CHANGE_A; |
| s->init_num = 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; |
| #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)) { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| |
| if (!s->method->ssl3_enc->change_cipher_state(s, |
| SSL3_CHANGE_CIPHER_CLIENT_WRITE)) |
| { |
| ret = -1; |
| s->state = SSL_ST_ERR; |
| goto end; |
| } |
| #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 SSL3_ST_CW_FINISHED_A: |
| case SSL3_ST_CW_FINISHED_B: |
| if (!s->hit) |
| dtls1_start_timer(s); |
| ret = dtls1_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; |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { |
| s->d1->next_state = s->s3->tmp.next_state; |
| s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; |
| } |
| #endif |
| if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { |
| s->state = SSL_ST_OK; |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { |
| s->d1->next_state = SSL_ST_OK; |
| s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; |
| } |
| #endif |
| s->s3->flags |= SSL3_FLAGS_POP_BUFFER; |
| s->s3->delay_buf_pop_ret = 0; |
| } |
| } else { |
| #ifndef OPENSSL_NO_SCTP |
| /* |
| * 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 |
| |
| #ifndef OPENSSL_NO_TLSEXT |
| /* |
| * Allow NewSessionTicket if ticket expected |
| */ |
| if (s->tlsext_ticket_expected) |
| s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; |
| else |
| #endif |
| |
| s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; |
| } |
| s->init_num = 0; |
| break; |
| |
| #ifndef OPENSSL_NO_TLSEXT |
| 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; |
| #endif |
| |
| 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; |
| |
| #ifndef OPENSSL_NO_SCTP |
| if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && |
| state == SSL_ST_RENEGOTIATE) { |
| s->d1->next_state = s->state; |
| s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; |
| } |
| #endif |
| |
| 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); |
| |
| #if 0 |
| if (s->init_buf != NULL) { |
| BUF_MEM_free(s->init_buf); |
| s->init_buf = NULL; |
| } |
| #endif |
| |
| /* |
| * 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; */ |
| |
| case SSL_ST_ERR: |
| 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--; |
| |
| #ifndef OPENSSL_NO_SCTP |
| /* |
| * Notify SCTP BIO socket to leave handshake mode and allow stream |
| * identifier other than 0. Will be ignored if no SCTP is used. |
| */ |
| BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, |
| s->in_handshake, NULL); |
| #endif |
| |
| if (buf != NULL) |
| BUF_MEM_free(buf); |
| if (cb != NULL) |
| cb(s, SSL_CB_CONNECT_EXIT, ret); |
| return (ret); |
| } |
| |
| int dtls1_client_hello(SSL *s) |
| { |
| unsigned char *buf; |
| unsigned char *p, *d; |
| unsigned int i, j; |
| unsigned long l; |
| SSL_COMP *comp; |
| |
| buf = (unsigned char *)s->init_buf->data; |
| if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { |
| SSL_SESSION *sess = s->session; |
| if ((s->session == NULL) || (s->session->ssl_version != s->version) || |
| #ifdef OPENSSL_NO_TLSEXT |
| !sess->session_id_length || |
| #else |
| (!sess->session_id_length && !sess->tlsext_tick) || |
| #endif |
| (s->session->not_resumable)) { |
| if (!ssl_get_new_session(s, 0)) |
| goto err; |
| } |
| /* else use the pre-loaded session */ |
| |
| p = s->s3->client_random; |
| |
| /* |
| * if client_random is initialized, reuse it, we are required to use |
| * same upon reply to HelloVerify |
| */ |
| for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; |
| if (i == sizeof(s->s3->client_random)) |
| ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); |
| |
| /* Do the message type and length last */ |
| d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); |
| |
| *(p++) = s->version >> 8; |
| *(p++) = s->version & 0xff; |
| s->client_version = s->version; |
| |
| /* Random stuff */ |
| memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); |
| p += SSL3_RANDOM_SIZE; |
| |
| /* Session ID */ |
| if (s->new_session) |
| i = 0; |
| else |
| i = s->session->session_id_length; |
| *(p++) = i; |
| if (i != 0) { |
| if (i > sizeof s->session->session_id) { |
| SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| memcpy(p, s->session->session_id, i); |
| p += i; |
| } |
| |
| /* cookie stuff */ |
| if (s->d1->cookie_len > sizeof(s->d1->cookie)) { |
| SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| *(p++) = s->d1->cookie_len; |
| memcpy(p, s->d1->cookie, s->d1->cookie_len); |
| p += s->d1->cookie_len; |
| |
| /* Ciphers supported */ |
| i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); |
| if (i == 0) { |
| SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); |
| goto err; |
| } |
| s2n(i, p); |
| p += i; |
| |
| /* COMPRESSION */ |
| if (s->ctx->comp_methods == NULL) |
| j = 0; |
| else |
| j = sk_SSL_COMP_num(s->ctx->comp_methods); |
| *(p++) = 1 + j; |
| for (i = 0; i < j; i++) { |
| comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); |
| *(p++) = comp->id; |
| } |
| *(p++) = 0; /* Add the NULL method */ |
| |
| #ifndef OPENSSL_NO_TLSEXT |
| /* TLS extensions */ |
| if (ssl_prepare_clienthello_tlsext(s) <= 0) { |
| SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
| goto err; |
| } |
| if ((p = |
| ssl_add_clienthello_tlsext(s, p, |
| buf + SSL3_RT_MAX_PLAIN_LENGTH)) == |
| NULL) { |
| SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| #endif |
| |
| l = (p - d); |
| d = buf; |
| |
| d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); |
| |
| s->state = SSL3_ST_CW_CLNT_HELLO_B; |
| /* number of bytes to write */ |
| s->init_num = p - buf; |
| s->init_off = 0; |
| |
| /* buffer the message to handle re-xmits */ |
| dtls1_buffer_message(s, 0); |
| } |
| |
| /* SSL3_ST_CW_CLNT_HELLO_B */ |
| return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); |
| err: |
| return (-1); |
| } |
| |
| static int dtls1_get_hello_verify(SSL *s) |
| { |
| int n, al, ok = 0; |
| unsigned char *data; |
| unsigned int cookie_len; |
| |
| 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); |
| } |
| |
| data = (unsigned char *)s->init_msg; |
| |
| if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { |
| SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); |
| s->version = (s->version & 0xff00) | data[1]; |
| al = SSL_AD_PROTOCOL_VERSION; |
| goto f_err; |
| } |
| data += 2; |
| |
| cookie_len = *(data++); |
| if (cookie_len > sizeof(s->d1->cookie)) { |
| al = SSL_AD_ILLEGAL_PARAMETER; |
| goto f_err; |
| } |
| |
| memcpy(s->d1->cookie, data, cookie_len); |
| s->d1->cookie_len = cookie_len; |
| |
| s->d1->send_cookie = 1; |
| return 1; |
| |
| f_err: |
| ssl3_send_alert(s, SSL3_AL_FATAL, al); |
| s->state = SSL_ST_ERR; |
| return -1; |
| } |
| |
| int dtls1_send_client_key_exchange(SSL *s) |
| { |
| unsigned char *p, *d; |
| int n; |
| unsigned long alg_k; |
| #ifndef OPENSSL_NO_RSA |
| unsigned char *q; |
| EVP_PKEY *pkey = NULL; |
| #endif |
| #ifndef OPENSSL_NO_KRB5 |
| KSSL_ERR kssl_err; |
| #endif /* OPENSSL_NO_KRB5 */ |
| #ifndef OPENSSL_NO_ECDH |
| EC_KEY *clnt_ecdh = NULL; |
| const EC_POINT *srvr_ecpoint = NULL; |
| EVP_PKEY *srvr_pub_pkey = NULL; |
| unsigned char *encodedPoint = NULL; |
| int encoded_pt_len = 0; |
| BN_CTX *bn_ctx = NULL; |
| #endif |
| |
| if (s->state == SSL3_ST_CW_KEY_EXCH_A) { |
| d = (unsigned char *)s->init_buf->data; |
| p = &(d[DTLS1_HM_HEADER_LENGTH]); |
| |
| alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
| |
| /* Fool emacs indentation */ |
| if (0) { |
| } |
| #ifndef OPENSSL_NO_RSA |
| else if (alg_k & SSL_kRSA) { |
| RSA *rsa; |
| unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; |
| |
| if (s->session->sess_cert == NULL) { |
| /* |
| * We should always have a server certificate with SSL_kRSA. |
| */ |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| |
| if (s->session->sess_cert->peer_rsa_tmp != NULL) |
| rsa = s->session->sess_cert->peer_rsa_tmp; |
| else { |
| pkey = |
| X509_get_pubkey(s->session-> |
| sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. |
| x509); |
| if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) |
| || (pkey->pkey.rsa == NULL)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| rsa = pkey->pkey.rsa; |
| EVP_PKEY_free(pkey); |
| } |
| |
| tmp_buf[0] = s->client_version >> 8; |
| tmp_buf[1] = s->client_version & 0xff; |
| if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) |
| goto err; |
| |
| s->session->master_key_length = sizeof tmp_buf; |
| |
| q = p; |
| /* Fix buf for TLS and [incidentally] DTLS */ |
| if (s->version > SSL3_VERSION) |
| p += 2; |
| n = RSA_public_encrypt(sizeof tmp_buf, |
| tmp_buf, p, rsa, RSA_PKCS1_PADDING); |
| # 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 |
| if (n <= 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_BAD_RSA_ENCRYPT); |
| goto err; |
| } |
| |
| /* Fix buf for TLS and [incidentally] DTLS */ |
| if (s->version > SSL3_VERSION) { |
| s2n(n, q); |
| n += 2; |
| } |
| |
| s->session->master_key_length = |
| s->method->ssl3_enc->generate_master_secret(s, |
| s-> |
| session->master_key, |
| tmp_buf, |
| sizeof tmp_buf); |
| OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); |
| } |
| #endif |
| #ifndef OPENSSL_NO_KRB5 |
| else if (alg_k & SSL_kKRB5) { |
| krb5_error_code krb5rc; |
| KSSL_CTX *kssl_ctx = s->kssl_ctx; |
| /* krb5_data krb5_ap_req; */ |
| krb5_data *enc_ticket; |
| krb5_data authenticator, *authp = NULL; |
| EVP_CIPHER_CTX ciph_ctx; |
| const EVP_CIPHER *enc = NULL; |
| unsigned char iv[EVP_MAX_IV_LENGTH]; |
| unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; |
| unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; |
| int padl, outl = sizeof(epms); |
| |
| EVP_CIPHER_CTX_init(&ciph_ctx); |
| |
| # ifdef KSSL_DEBUG |
| printf("ssl3_send_client_key_exchange(%lx & %lx)\n", |
| alg_k, SSL_kKRB5); |
| # endif /* KSSL_DEBUG */ |
| |
| authp = NULL; |
| # ifdef KRB5SENDAUTH |
| if (KRB5SENDAUTH) |
| authp = &authenticator; |
| # endif /* KRB5SENDAUTH */ |
| |
| krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); |
| enc = kssl_map_enc(kssl_ctx->enctype); |
| if (enc == NULL) |
| goto err; |
| # ifdef KSSL_DEBUG |
| { |
| printf("kssl_cget_tkt rtn %d\n", krb5rc); |
| if (krb5rc && kssl_err.text) |
| printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); |
| } |
| # endif /* KSSL_DEBUG */ |
| |
| if (krb5rc) { |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); |
| goto err; |
| } |
| |
| /*- |
| * 20010406 VRS - Earlier versions used KRB5 AP_REQ |
| ** in place of RFC 2712 KerberosWrapper, as in: |
| ** |
| ** Send ticket (copy to *p, set n = length) |
| ** n = krb5_ap_req.length; |
| ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); |
| ** if (krb5_ap_req.data) |
| ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); |
| ** |
| ** Now using real RFC 2712 KerberosWrapper |
| ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) |
| ** Note: 2712 "opaque" types are here replaced |
| ** with a 2-byte length followed by the value. |
| ** Example: |
| ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms |
| ** Where "xx xx" = length bytes. Shown here with |
| ** optional authenticator omitted. |
| */ |
| |
| /* KerberosWrapper.Ticket */ |
| s2n(enc_ticket->length, p); |
| memcpy(p, enc_ticket->data, enc_ticket->length); |
| p += enc_ticket->length; |
| n = enc_ticket->length + 2; |
| |
| /* KerberosWrapper.Authenticator */ |
| if (authp && authp->length) { |
| s2n(authp->length, p); |
| memcpy(p, authp->data, authp->length); |
| p += authp->length; |
| n += authp->length + 2; |
| |
| free(authp->data); |
| authp->data = NULL; |
| authp->length = 0; |
| } else { |
| s2n(0, p); /* null authenticator length */ |
| n += 2; |
| } |
| |
| if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) |
| goto err; |
| |
| /*- |
| * 20010420 VRS. Tried it this way; failed. |
| * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); |
| * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, |
| * kssl_ctx->length); |
| * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); |
| */ |
| |
| memset(iv, 0, sizeof iv); /* per RFC 1510 */ |
| EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); |
| EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, |
| sizeof tmp_buf); |
| EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); |
| outl += padl; |
| if (outl > (int)sizeof epms) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| EVP_CIPHER_CTX_cleanup(&ciph_ctx); |
| |
| /* KerberosWrapper.EncryptedPreMasterSecret */ |
| s2n(outl, p); |
| memcpy(p, epms, outl); |
| p += outl; |
| n += outl + 2; |
| |
| s->session->master_key_length = |
| s->method->ssl3_enc->generate_master_secret(s, |
| s-> |
| session->master_key, |
| tmp_buf, |
| sizeof tmp_buf); |
| |
| OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); |
| OPENSSL_cleanse(epms, outl); |
| } |
| #endif |
| #ifndef OPENSSL_NO_DH |
| else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { |
| DH *dh_srvr, *dh_clnt; |
| |
| if (s->session->sess_cert == NULL) { |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_UNEXPECTED_MESSAGE); |
| goto err; |
| } |
| |
| if (s->session->sess_cert->peer_dh_tmp != NULL) |
| dh_srvr = s->session->sess_cert->peer_dh_tmp; |
| else { |
| /* we get them from the cert */ |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); |
| goto err; |
| } |
| |
| /* generate a new random key */ |
| if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
| goto err; |
| } |
| if (!DH_generate_key(dh_clnt)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
| goto err; |
| } |
| |
| /* |
| * use the 'p' output buffer for the DH key, but make sure to |
| * clear it out afterwards |
| */ |
| |
| n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); |
| |
| if (n <= 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
| goto err; |
| } |
| |
| /* generate master key from the result */ |
| s->session->master_key_length = |
| s->method->ssl3_enc->generate_master_secret(s, |
| s-> |
| session->master_key, |
| p, n); |
| /* clean up */ |
| memset(p, 0, n); |
| |
| /* send off the data */ |
| n = BN_num_bytes(dh_clnt->pub_key); |
| s2n(n, p); |
| BN_bn2bin(dh_clnt->pub_key, p); |
| n += 2; |
| |
| DH_free(dh_clnt); |
| |
| /* perhaps clean things up a bit EAY EAY EAY EAY */ |
| } |
| #endif |
| #ifndef OPENSSL_NO_ECDH |
| else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { |
| const EC_GROUP *srvr_group = NULL; |
| EC_KEY *tkey; |
| int ecdh_clnt_cert = 0; |
| int field_size = 0; |
| |
| if (s->session->sess_cert == NULL) { |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_UNEXPECTED_MESSAGE); |
| goto err; |
| } |
| |
| /* |
| * Did we send out the client's ECDH share for use in premaster |
| * computation as part of client certificate? If so, set |
| * ecdh_clnt_cert to 1. |
| */ |
| if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { |
| /* |
| * XXX: For now, we do not support client authentication |
| * using ECDH certificates. To add such support, one needs to |
| * add code that checks for appropriate conditions and sets |
| * ecdh_clnt_cert to 1. For example, the cert have an ECC key |
| * on the same curve as the server's and the key should be |
| * authorized for key agreement. One also needs to add code |
| * in ssl3_connect to skip sending the certificate verify |
| * message. if ((s->cert->key->privatekey != NULL) && |
| * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) |
| * ecdh_clnt_cert = 1; |
| */ |
| } |
| |
| if (s->session->sess_cert->peer_ecdh_tmp != NULL) { |
| tkey = s->session->sess_cert->peer_ecdh_tmp; |
| } else { |
| /* Get the Server Public Key from Cert */ |
| srvr_pub_pkey = |
| X509_get_pubkey(s->session-> |
| sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); |
| if ((srvr_pub_pkey == NULL) |
| || (srvr_pub_pkey->type != EVP_PKEY_EC) |
| || (srvr_pub_pkey->pkey.ec == NULL)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| |
| tkey = srvr_pub_pkey->pkey.ec; |
| } |
| |
| srvr_group = EC_KEY_get0_group(tkey); |
| srvr_ecpoint = EC_KEY_get0_public_key(tkey); |
| |
| if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| |
| if ((clnt_ecdh = EC_KEY_new()) == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| |
| if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
| goto err; |
| } |
| if (ecdh_clnt_cert) { |
| /* |
| * Reuse key info from our certificate We only need our |
| * private key to perform the ECDH computation. |
| */ |
| const BIGNUM *priv_key; |
| tkey = s->cert->key->privatekey->pkey.ec; |
| priv_key = EC_KEY_get0_private_key(tkey); |
| if (priv_key == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_EC_LIB); |
| goto err; |
| } |
| } else { |
| /* Generate a new ECDH key pair */ |
| if (!(EC_KEY_generate_key(clnt_ecdh))) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_ECDH_LIB); |
| goto err; |
| } |
| } |
| |
| /* |
| * use the 'p' output buffer for the ECDH key, but make sure to |
| * clear it out afterwards |
| */ |
| |
| field_size = EC_GROUP_get_degree(srvr_group); |
| if (field_size <= 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
| goto err; |
| } |
| n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, |
| clnt_ecdh, NULL); |
| if (n <= 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
| goto err; |
| } |
| |
| /* generate master key from the result */ |
| s->session->master_key_length = |
| s->method->ssl3_enc->generate_master_secret(s, |
| s-> |
| session->master_key, |
| p, n); |
| |
| memset(p, 0, n); /* clean up */ |
| |
| if (ecdh_clnt_cert) { |
| /* Send empty client key exch message */ |
| n = 0; |
| } else { |
| /* |
| * First check the size of encoding and allocate memory |
| * accordingly. |
| */ |
| encoded_pt_len = |
| EC_POINT_point2oct(srvr_group, |
| EC_KEY_get0_public_key(clnt_ecdh), |
| POINT_CONVERSION_UNCOMPRESSED, |
| NULL, 0, NULL); |
| |
| encodedPoint = (unsigned char *) |
| OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); |
| bn_ctx = BN_CTX_new(); |
| if ((encodedPoint == NULL) || (bn_ctx == NULL)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| |
| /* Encode the public key */ |
| n = EC_POINT_point2oct(srvr_group, |
| EC_KEY_get0_public_key(clnt_ecdh), |
| POINT_CONVERSION_UNCOMPRESSED, |
| encodedPoint, encoded_pt_len, bn_ctx); |
| |
| *p = n; /* length of encoded point */ |
| /* Encoded point will be copied here */ |
| p += 1; |
| /* copy the point */ |
| memcpy((unsigned char *)p, encodedPoint, n); |
| /* increment n to account for length field */ |
| n += 1; |
| } |
| |
| /* Free allocated memory */ |
| BN_CTX_free(bn_ctx); |
| if (encodedPoint != NULL) |
| OPENSSL_free(encodedPoint); |
| if (clnt_ecdh != NULL) |
| EC_KEY_free(clnt_ecdh); |
| EVP_PKEY_free(srvr_pub_pkey); |
| } |
| #endif /* !OPENSSL_NO_ECDH */ |
| |
| #ifndef OPENSSL_NO_PSK |
| else if (alg_k & SSL_kPSK) { |
| char identity[PSK_MAX_IDENTITY_LEN]; |
| unsigned char *t = NULL; |
| unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; |
| unsigned int pre_ms_len = 0, psk_len = 0; |
| int psk_err = 1; |
| |
| n = 0; |
| if (s->psk_client_callback == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_PSK_NO_CLIENT_CB); |
| goto err; |
| } |
| |
| psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, |
| identity, PSK_MAX_IDENTITY_LEN, |
| psk_or_pre_ms, |
| sizeof(psk_or_pre_ms)); |
| if (psk_len > PSK_MAX_PSK_LEN) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto psk_err; |
| } else if (psk_len == 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| SSL_R_PSK_IDENTITY_NOT_FOUND); |
| goto psk_err; |
| } |
| |
| /* create PSK pre_master_secret */ |
| pre_ms_len = 2 + psk_len + 2 + psk_len; |
| t = psk_or_pre_ms; |
| memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); |
| s2n(psk_len, t); |
| memset(t, 0, psk_len); |
| t += psk_len; |
| s2n(psk_len, t); |
| |
| if (s->session->psk_identity_hint != NULL) |
| OPENSSL_free(s->session->psk_identity_hint); |
| s->session->psk_identity_hint = |
| BUF_strdup(s->ctx->psk_identity_hint); |
| if (s->ctx->psk_identity_hint != NULL |
| && s->session->psk_identity_hint == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_MALLOC_FAILURE); |
| goto psk_err; |
| } |
| |
| if (s->session->psk_identity != NULL) |
| OPENSSL_free(s->session->psk_identity); |
| s->session->psk_identity = BUF_strdup(identity); |
| if (s->session->psk_identity == NULL) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_MALLOC_FAILURE); |
| goto psk_err; |
| } |
| |
| s->session->master_key_length = |
| s->method->ssl3_enc->generate_master_secret(s, |
| s-> |
| session->master_key, |
| psk_or_pre_ms, |
| pre_ms_len); |
| n = strlen(identity); |
| s2n(n, p); |
| memcpy(p, identity, n); |
| n += 2; |
| psk_err = 0; |
| psk_err: |
| OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); |
| OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); |
| if (psk_err != 0) { |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| goto err; |
| } |
| } |
| #endif |
| else { |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, |
| ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| |
| d = dtls1_set_message_header(s, d, |
| SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); |
| /*- |
| *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; |
| l2n3(n,d); |
| l2n(s->d1->handshake_write_seq,d); |
| s->d1->handshake_write_seq++; |
| */ |
| |
| s->state = SSL3_ST_CW_KEY_EXCH_B; |
| /* number of bytes to write */ |
| s->init_num = n + DTLS1_HM_HEADER_LENGTH; |
| s->init_off = 0; |
| |
| /* buffer the message to handle re-xmits */ |
| dtls1_buffer_message(s, 0); |
| } |
| |
| /* SSL3_ST_CW_KEY_EXCH_B */ |
| return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); |
| err: |
| #ifndef OPENSSL_NO_ECDH |
| BN_CTX_free(bn_ctx); |
| if (encodedPoint != NULL) |
| OPENSSL_free(encodedPoint); |
| if (clnt_ecdh != NULL) |
| EC_KEY_free(clnt_ecdh); |
| EVP_PKEY_free(srvr_pub_pkey); |
| #endif |
| return (-1); |
| } |
| |
| int dtls1_send_client_verify(SSL *s) |
| { |
| unsigned char *p, *d; |
| unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; |
| EVP_PKEY *pkey; |
| #ifndef OPENSSL_NO_RSA |
| unsigned u = 0; |
| #endif |
| unsigned long n; |
| #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) |
| int j; |
| #endif |
| |
| if (s->state == SSL3_ST_CW_CERT_VRFY_A) { |
| d = (unsigned char *)s->init_buf->data; |
| p = &(d[DTLS1_HM_HEADER_LENGTH]); |
| pkey = s->cert->key->privatekey; |
| |
| s->method->ssl3_enc->cert_verify_mac(s, |
| NID_sha1, |
| &(data[MD5_DIGEST_LENGTH])); |
| |
| #ifndef OPENSSL_NO_RSA |
| if (pkey->type == EVP_PKEY_RSA) { |
| s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); |
| if (RSA_sign(NID_md5_sha1, data, |
| MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, |
| &(p[2]), &u, pkey->pkey.rsa) <= 0) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); |
| goto err; |
| } |
| s2n(u, p); |
| n = u + 2; |
| } else |
| #endif |
| #ifndef OPENSSL_NO_DSA |
| if (pkey->type == EVP_PKEY_DSA) { |
| if (!DSA_sign(pkey->save_type, |
| &(data[MD5_DIGEST_LENGTH]), |
| SHA_DIGEST_LENGTH, &(p[2]), |
| (unsigned int *)&j, pkey->pkey.dsa)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); |
| goto err; |
| } |
| s2n(j, p); |
| n = j + 2; |
| } else |
| #endif |
| #ifndef OPENSSL_NO_ECDSA |
| if (pkey->type == EVP_PKEY_EC) { |
| if (!ECDSA_sign(pkey->save_type, |
| &(data[MD5_DIGEST_LENGTH]), |
| SHA_DIGEST_LENGTH, &(p[2]), |
| (unsigned int *)&j, pkey->pkey.ec)) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); |
| goto err; |
| } |
| s2n(j, p); |
| n = j + 2; |
| } else |
| #endif |
| { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); |
| goto err; |
| } |
| |
| d = dtls1_set_message_header(s, d, |
| SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); |
| |
| s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; |
| s->init_off = 0; |
| |
| /* buffer the message to handle re-xmits */ |
| dtls1_buffer_message(s, 0); |
| |
| s->state = SSL3_ST_CW_CERT_VRFY_B; |
| } |
| |
| /* s->state = SSL3_ST_CW_CERT_VRFY_B */ |
| return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); |
| err: |
| return (-1); |
| } |
| |
| int dtls1_send_client_certificate(SSL *s) |
| { |
| X509 *x509 = NULL; |
| EVP_PKEY *pkey = NULL; |
| int i; |
| unsigned long l; |
| |
| if (s->state == SSL3_ST_CW_CERT_A) { |
| if ((s->cert == NULL) || |
| (s->cert->key->x509 == NULL) || |
| (s->cert->key->privatekey == NULL)) |
| s->state = SSL3_ST_CW_CERT_B; |
| else |
| s->state = SSL3_ST_CW_CERT_C; |
| } |
| |
| /* We need to get a client cert */ |
| if (s->state == SSL3_ST_CW_CERT_B) { |
| /* |
| * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; |
| * return(-1); We then get retied later |
| */ |
| i = 0; |
| i = ssl_do_client_cert_cb(s, &x509, &pkey); |
| if (i < 0) { |
| s->rwstate = SSL_X509_LOOKUP; |
| return (-1); |
| } |
| s->rwstate = SSL_NOTHING; |
| if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { |
| s->state = SSL3_ST_CW_CERT_B; |
| if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) |
| i = 0; |
| } else if (i == 1) { |
| i = 0; |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, |
| SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); |
| } |
| |
| if (x509 != NULL) |
| X509_free(x509); |
| if (pkey != NULL) |
| EVP_PKEY_free(pkey); |
| 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 (1); |
| } else { |
| s->s3->tmp.cert_req = 2; |
| } |
| } |
| |
| /* Ok, we have a cert */ |
| s->state = SSL3_ST_CW_CERT_C; |
| } |
| |
| if (s->state == SSL3_ST_CW_CERT_C) { |
| s->state = SSL3_ST_CW_CERT_D; |
| l = dtls1_output_cert_chain(s, |
| (s->s3->tmp.cert_req == |
| 2) ? NULL : s->cert->key->x509); |
| if (!l) { |
| SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); |
| ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| return 0; |
| } |
| s->init_num = (int)l; |
| s->init_off = 0; |
| |
| /* set header called by dtls1_output_cert_chain() */ |
| |
| /* buffer the message to handle re-xmits */ |
| dtls1_buffer_message(s, 0); |
| } |
| /* SSL3_ST_CW_CERT_D */ |
| return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); |
| } |