| /* |
| * DTLS implementation written by Nagendra Modadugu |
| * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1999-2005 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). */ |
| |
| #include <openssl/base.h> |
| |
| #include <stdio.h> |
| |
| #if defined(OPENSSL_WINDOWS) |
| #include <sys/timeb.h> |
| #else |
| #include <sys/socket.h> |
| #endif |
| |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| #include <openssl/obj.h> |
| |
| #include "ssl_locl.h" |
| |
| static void get_current_time(struct timeval *t); |
| static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len); |
| static int dtls1_handshake_write(SSL *s); |
| int dtls1_listen(SSL *s, struct sockaddr *client); |
| |
| SSL3_ENC_METHOD DTLSv1_enc_data={ |
| tls1_enc, |
| tls1_mac, |
| tls1_setup_key_block, |
| tls1_generate_master_secret, |
| tls1_change_cipher_state, |
| tls1_final_finish_mac, |
| TLS1_FINISH_MAC_LENGTH, |
| tls1_cert_verify_mac, |
| TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, |
| TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, |
| tls1_alert_code, |
| tls1_export_keying_material, |
| SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV, |
| DTLS1_HM_HEADER_LENGTH, |
| dtls1_set_handshake_header, |
| dtls1_handshake_write |
| }; |
| |
| SSL3_ENC_METHOD DTLSv1_2_enc_data={ |
| tls1_enc, |
| tls1_mac, |
| tls1_setup_key_block, |
| tls1_generate_master_secret, |
| tls1_change_cipher_state, |
| tls1_final_finish_mac, |
| TLS1_FINISH_MAC_LENGTH, |
| tls1_cert_verify_mac, |
| TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, |
| TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, |
| tls1_alert_code, |
| tls1_export_keying_material, |
| SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS |
| |SSL_ENC_FLAG_SHA256_PRF|SSL_ENC_FLAG_TLS1_2_CIPHERS, |
| DTLS1_HM_HEADER_LENGTH, |
| dtls1_set_handshake_header, |
| dtls1_handshake_write |
| }; |
| |
| long dtls1_default_timeout(void) |
| { |
| /* 2 hours, the 24 hours mentioned in the DTLSv1 spec |
| * is way too long for http, the cache would over fill */ |
| return(60*60*2); |
| } |
| |
| int dtls1_new(SSL *s) |
| { |
| DTLS1_STATE *d1; |
| |
| if (!ssl3_new(s)) return(0); |
| if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) |
| { |
| ssl3_free(s); |
| return (0); |
| } |
| memset(d1,0, sizeof *d1); |
| |
| /* d1->handshake_epoch=0; */ |
| |
| d1->unprocessed_rcds.q=pqueue_new(); |
| d1->processed_rcds.q=pqueue_new(); |
| d1->buffered_messages = pqueue_new(); |
| d1->sent_messages=pqueue_new(); |
| d1->buffered_app_data.q=pqueue_new(); |
| |
| if ( s->server) |
| { |
| d1->cookie_len = sizeof(s->d1->cookie); |
| } |
| |
| if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q |
| || ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q) |
| { |
| if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q); |
| if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q); |
| if ( d1->buffered_messages) pqueue_free(d1->buffered_messages); |
| if ( d1->sent_messages) pqueue_free(d1->sent_messages); |
| if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q); |
| OPENSSL_free(d1); |
| ssl3_free(s); |
| return (0); |
| } |
| |
| s->d1=d1; |
| s->method->ssl_clear(s); |
| return(1); |
| } |
| |
| static void dtls1_clear_queues(SSL *s) |
| { |
| pitem *item = NULL; |
| hm_fragment *frag = NULL; |
| DTLS1_RECORD_DATA *rdata; |
| |
| while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) |
| { |
| rdata = (DTLS1_RECORD_DATA *) item->data; |
| if (rdata->rbuf.buf) |
| { |
| OPENSSL_free(rdata->rbuf.buf); |
| } |
| OPENSSL_free(item->data); |
| pitem_free(item); |
| } |
| |
| while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) |
| { |
| rdata = (DTLS1_RECORD_DATA *) item->data; |
| if (rdata->rbuf.buf) |
| { |
| OPENSSL_free(rdata->rbuf.buf); |
| } |
| OPENSSL_free(item->data); |
| pitem_free(item); |
| } |
| |
| while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL) |
| { |
| frag = (hm_fragment *)item->data; |
| OPENSSL_free(frag->fragment); |
| OPENSSL_free(frag); |
| pitem_free(item); |
| } |
| |
| while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL) |
| { |
| frag = (hm_fragment *)item->data; |
| OPENSSL_free(frag->fragment); |
| OPENSSL_free(frag); |
| pitem_free(item); |
| } |
| |
| while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) |
| { |
| rdata = (DTLS1_RECORD_DATA *) item->data; |
| if (rdata->rbuf.buf) |
| { |
| OPENSSL_free(rdata->rbuf.buf); |
| } |
| OPENSSL_free(item->data); |
| pitem_free(item); |
| } |
| } |
| |
| void dtls1_free(SSL *s) |
| { |
| ssl3_free(s); |
| |
| dtls1_clear_queues(s); |
| |
| pqueue_free(s->d1->unprocessed_rcds.q); |
| pqueue_free(s->d1->processed_rcds.q); |
| pqueue_free(s->d1->buffered_messages); |
| pqueue_free(s->d1->sent_messages); |
| pqueue_free(s->d1->buffered_app_data.q); |
| |
| OPENSSL_free(s->d1); |
| s->d1 = NULL; |
| } |
| |
| void dtls1_clear(SSL *s) |
| { |
| pqueue unprocessed_rcds; |
| pqueue processed_rcds; |
| pqueue buffered_messages; |
| pqueue sent_messages; |
| pqueue buffered_app_data; |
| unsigned int mtu; |
| |
| if (s->d1) |
| { |
| unprocessed_rcds = s->d1->unprocessed_rcds.q; |
| processed_rcds = s->d1->processed_rcds.q; |
| buffered_messages = s->d1->buffered_messages; |
| sent_messages = s->d1->sent_messages; |
| buffered_app_data = s->d1->buffered_app_data.q; |
| mtu = s->d1->mtu; |
| |
| dtls1_clear_queues(s); |
| |
| memset(s->d1, 0, sizeof(*(s->d1))); |
| |
| if (s->server) |
| { |
| s->d1->cookie_len = sizeof(s->d1->cookie); |
| } |
| |
| if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) |
| { |
| s->d1->mtu = mtu; |
| } |
| |
| s->d1->unprocessed_rcds.q = unprocessed_rcds; |
| s->d1->processed_rcds.q = processed_rcds; |
| s->d1->buffered_messages = buffered_messages; |
| s->d1->sent_messages = sent_messages; |
| s->d1->buffered_app_data.q = buffered_app_data; |
| } |
| |
| ssl3_clear(s); |
| if (s->options & SSL_OP_CISCO_ANYCONNECT) |
| s->version=DTLS1_BAD_VER; |
| else if (s->method->version == DTLS_ANY_VERSION) |
| s->version=DTLS1_2_VERSION; |
| else |
| s->version=s->method->version; |
| } |
| |
| long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg) |
| { |
| int ret=0; |
| |
| switch (cmd) |
| { |
| case DTLS_CTRL_GET_TIMEOUT: |
| if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) |
| { |
| ret = 1; |
| } |
| break; |
| case DTLS_CTRL_HANDLE_TIMEOUT: |
| ret = dtls1_handle_timeout(s); |
| break; |
| case DTLS_CTRL_LISTEN: |
| ret = dtls1_listen(s, parg); |
| break; |
| |
| default: |
| ret = ssl3_ctrl(s, cmd, larg, parg); |
| break; |
| } |
| return(ret); |
| } |
| |
| /* |
| * As it's impossible to use stream ciphers in "datagram" mode, this |
| * simple filter is designed to disengage them in DTLS. Unfortunately |
| * there is no universal way to identify stream SSL_CIPHER, so we have |
| * to explicitly list their SSL_* codes. Currently RC4 is the only one |
| * available, but if new ones emerge, they will have to be added... |
| */ |
| const SSL_CIPHER *dtls1_get_cipher(unsigned int u) |
| { |
| const SSL_CIPHER *ciph = ssl3_get_cipher(u); |
| |
| if (ciph != NULL) |
| { |
| if (ciph->algorithm_enc == SSL_RC4) |
| return NULL; |
| } |
| |
| return ciph; |
| } |
| |
| void dtls1_start_timer(SSL *s) |
| { |
| /* If timer is not set, initialize duration with 1 second */ |
| if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) |
| { |
| s->d1->timeout_duration = 1; |
| } |
| |
| /* Set timeout to current time */ |
| get_current_time(&(s->d1->next_timeout)); |
| |
| /* Add duration to current time */ |
| s->d1->next_timeout.tv_sec += s->d1->timeout_duration; |
| BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout)); |
| } |
| |
| struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft) |
| { |
| struct timeval timenow; |
| |
| /* If no timeout is set, just return NULL */ |
| if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) |
| { |
| return NULL; |
| } |
| |
| /* Get current time */ |
| get_current_time(&timenow); |
| |
| /* If timer already expired, set remaining time to 0 */ |
| if (s->d1->next_timeout.tv_sec < timenow.tv_sec || |
| (s->d1->next_timeout.tv_sec == timenow.tv_sec && |
| s->d1->next_timeout.tv_usec <= timenow.tv_usec)) |
| { |
| memset(timeleft, 0, sizeof(struct timeval)); |
| return timeleft; |
| } |
| |
| /* Calculate time left until timer expires */ |
| memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval)); |
| timeleft->tv_sec -= timenow.tv_sec; |
| timeleft->tv_usec -= timenow.tv_usec; |
| if (timeleft->tv_usec < 0) |
| { |
| timeleft->tv_sec--; |
| timeleft->tv_usec += 1000000; |
| } |
| |
| /* If remaining time is less than 15 ms, set it to 0 |
| * to prevent issues because of small devergences with |
| * socket timeouts. |
| */ |
| if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) |
| { |
| memset(timeleft, 0, sizeof(struct timeval)); |
| } |
| |
| |
| return timeleft; |
| } |
| |
| int dtls1_is_timer_expired(SSL *s) |
| { |
| struct timeval timeleft; |
| |
| /* Get time left until timeout, return false if no timer running */ |
| if (dtls1_get_timeout(s, &timeleft) == NULL) |
| { |
| return 0; |
| } |
| |
| /* Return false if timer is not expired yet */ |
| if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) |
| { |
| return 0; |
| } |
| |
| /* Timer expired, so return true */ |
| return 1; |
| } |
| |
| void dtls1_double_timeout(SSL *s) |
| { |
| s->d1->timeout_duration *= 2; |
| if (s->d1->timeout_duration > 60) |
| s->d1->timeout_duration = 60; |
| dtls1_start_timer(s); |
| } |
| |
| void dtls1_stop_timer(SSL *s) |
| { |
| /* Reset everything */ |
| memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st)); |
| memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); |
| s->d1->timeout_duration = 1; |
| BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout)); |
| /* Clear retransmission buffer */ |
| dtls1_clear_record_buffer(s); |
| } |
| |
| int dtls1_check_timeout_num(SSL *s) |
| { |
| s->d1->timeout.num_alerts++; |
| |
| /* Reduce MTU after 2 unsuccessful retransmissions */ |
| if (s->d1->timeout.num_alerts > 2) |
| { |
| s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL); |
| } |
| |
| if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) |
| { |
| /* fail the connection, enough alerts have been sent */ |
| OPENSSL_PUT_ERROR(SSL, dtls1_check_timeout_num, SSL_R_READ_TIMEOUT_EXPIRED); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int dtls1_handle_timeout(SSL *s) |
| { |
| /* if no timer is expired, don't do anything */ |
| if (!dtls1_is_timer_expired(s)) |
| { |
| return 0; |
| } |
| |
| dtls1_double_timeout(s); |
| |
| if (dtls1_check_timeout_num(s) < 0) |
| return -1; |
| |
| s->d1->timeout.read_timeouts++; |
| if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) |
| { |
| s->d1->timeout.read_timeouts = 1; |
| } |
| |
| dtls1_start_timer(s); |
| return dtls1_retransmit_buffered_messages(s); |
| } |
| |
| static void get_current_time(struct timeval *t) |
| { |
| #ifdef OPENSSL_SYS_WIN32 |
| struct _timeb tb; |
| _ftime(&tb); |
| t->tv_sec = (long)tb.time; |
| t->tv_usec = (long)tb.millitm * 1000; |
| #else |
| gettimeofday(t, NULL); |
| #endif |
| } |
| |
| int dtls1_listen(SSL *s, struct sockaddr *client) |
| { |
| int ret; |
| |
| SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE); |
| s->d1->listen = 1; |
| |
| ret = SSL_accept(s); |
| if (ret <= 0) return ret; |
| |
| BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_GET_PEER, 0, &client); |
| return 1; |
| } |
| |
| static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len) |
| { |
| unsigned char *p = (unsigned char *)s->init_buf->data; |
| dtls1_set_message_header(s, p, htype, len, 0, len); |
| s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH; |
| s->init_off = 0; |
| /* Buffer the message to handle re-xmits */ |
| dtls1_buffer_message(s, 0); |
| } |
| |
| static int dtls1_handshake_write(SSL *s) |
| { |
| return dtls1_do_write(s, SSL3_RT_HANDSHAKE); |
| } |