X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fd1_lib.c;h=fc1887ab35692c5574cac20486466bf67a15efcd;hp=bd28b75e84c47ce93274bf8cfafc47ba2c664922;hb=fd682e4cddc44b2869f43c910be49ab4f3a09b08;hpb=babb379849ffb4112792f266f92e9ebb2bd35332 diff --git a/ssl/d1_lib.c b/ssl/d1_lib.c index bd28b75e84..fc1887ab35 100644 --- a/ssl/d1_lib.c +++ b/ssl/d1_lib.c @@ -1,7 +1,7 @@ /* ssl/d1_lib.c */ -/* +/* * DTLS implementation written by Nagendra Modadugu - * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. + * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */ /* ==================================================================== * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. @@ -11,7 +11,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 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 @@ -58,115 +58,246 @@ */ #include +#define USE_SOCKETS #include #include "ssl_locl.h" -const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT; - -SSL3_ENC_METHOD DTLSv1_enc_data={ - dtls1_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, - }; +#if defined(OPENSSL_SYS_VMS) +# include +#elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_) +# include +#elif defined(OPENSSL_SYS_VXWORKS) +# include +#elif !defined(OPENSSL_SYS_WIN32) +# include +#endif + +static void get_current_time(struct timeval *t); +static int 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); + +const 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 +}; + +const 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); - } +{ + /* + * 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) 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(); - - 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) - { - 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); - OPENSSL_free(d1); - return (0); - } - - s->d1=d1; - s->method->ssl_clear(s); - return(1); - } +{ + DTLS1_STATE *d1; -void dtls1_free(SSL *s) - { - pitem *item = NULL; - hm_fragment *frag = NULL; + if (!DTLS_RECORD_LAYER_new(&s->rlayer)) { + return 0; + } + + if (!ssl3_new(s)) + return (0); + if ((d1 = OPENSSL_malloc(sizeof(*d1))) == NULL) { + ssl3_free(s); + return (0); + } + memset(d1, 0, sizeof(*d1)); - ssl3_free(s); + d1->buffered_messages = pqueue_new(); + d1->sent_messages = pqueue_new(); - while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) - { - OPENSSL_free(item->data); - pitem_free(item); - } - pqueue_free(s->d1->unprocessed_rcds.q); + if (s->server) { + d1->cookie_len = sizeof(s->d1->cookie); + } - while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) - { - OPENSSL_free(item->data); - pitem_free(item); - } - pqueue_free(s->d1->processed_rcds.q); + d1->link_mtu = 0; + d1->mtu = 0; + + if (!d1->buffered_messages || !d1->sent_messages) { + pqueue_free(d1->buffered_messages); + pqueue_free(d1->sent_messages); + 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; - while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL) - { + while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) { frag = (hm_fragment *)item->data; - OPENSSL_free(frag->fragment); - OPENSSL_free(frag); + dtls1_hm_fragment_free(frag); pitem_free(item); - } - pqueue_free(s->d1->buffered_messages); + } - while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL) - { + while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) { frag = (hm_fragment *)item->data; - OPENSSL_free(frag->fragment); - OPENSSL_free(frag); + dtls1_hm_fragment_free(frag); pitem_free(item); - } - pqueue_free(s->d1->sent_messages); + } +} - OPENSSL_free(s->d1); - } +void dtls1_free(SSL *s) +{ + DTLS_RECORD_LAYER_free(&s->rlayer); + + ssl3_free(s); + + dtls1_clear_queues(s); + + pqueue_free(s->d1->buffered_messages); + pqueue_free(s->d1->sent_messages); + + OPENSSL_free(s->d1); + s->d1 = NULL; +} void dtls1_clear(SSL *s) - { - ssl3_clear(s); - s->version=DTLS1_VERSION; - } +{ + pqueue buffered_messages; + pqueue sent_messages; + unsigned int mtu; + unsigned int link_mtu; + + DTLS_RECORD_LAYER_clear(&s->rlayer); + + if (s->d1) { + buffered_messages = s->d1->buffered_messages; + sent_messages = s->d1->sent_messages; + mtu = s->d1->mtu; + link_mtu = s->d1->link_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->link_mtu = link_mtu; + } + + s->d1->buffered_messages = buffered_messages; + s->d1->sent_messages = sent_messages; + } + + ssl3_clear(s); + if (s->options & SSL_OP_CISCO_ANYCONNECT) + s->client_version = 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; + case SSL_CTRL_CHECK_PROTO_VERSION: + /* + * For library-internal use; checks that the current protocol is the + * highest enabled version (according to s->ctx->method, as version + * negotiation may have changed s->method). + */ + if (s->version == s->ctx->method->version) + return 1; + /* + * Apparently we're using a version-flexible SSL_METHOD (not at its + * highest protocol version). + */ + if (s->ctx->method->version == DTLS_method()->version) { +#if DTLS_MAX_VERSION != DTLS1_2_VERSION +# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. +#endif + if (!(s->options & SSL_OP_NO_DTLSv1_2)) + return s->version == DTLS1_2_VERSION; + if (!(s->options & SSL_OP_NO_DTLSv1)) + return s->version == DTLS1_VERSION; + } + return 0; /* Unexpected state; fail closed. */ + case DTLS_CTRL_SET_LINK_MTU: + if (larg < (long)dtls1_link_min_mtu()) + return 0; + s->d1->link_mtu = larg; + return 1; + case DTLS_CTRL_GET_LINK_MIN_MTU: + return (long)dtls1_link_min_mtu(); + case SSL_CTRL_SET_MTU: + /* + * We may not have a BIO set yet so can't call dtls1_min_mtu() + * We'll have to make do with dtls1_link_min_mtu() and max overhead + */ + if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD) + return 0; + s->d1->mtu = larg; + return larg; + default: + ret = ssl3_ctrl(s, cmd, larg, parg); + break; + } + return (ret); +} /* * As it's impossible to use stream ciphers in "datagram" mode, this @@ -176,14 +307,233 @@ void dtls1_clear(SSL *s) * 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); +{ + 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) +{ +#ifndef OPENSSL_NO_SCTP + /* Disable timer for SCTP */ + if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { + memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout)); + return; + } +#endif + + /* 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(*timeleft)); + 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(*timeleft)); + } + + 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(s->d1->timeout)); + memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout)); + 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) +{ + unsigned int mtu; + + s->d1->timeout.num_alerts++; + + /* Reduce MTU after 2 unsuccessful retransmissions */ + if (s->d1->timeout.num_alerts > 2 + && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { + mtu = + BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, + NULL); + if (mtu < s->d1->mtu) + s->d1->mtu = mtu; + } + + if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) { + /* fail the connection, enough alerts have been sent */ + SSLerr(SSL_F_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; + } +#ifndef OPENSSL_NO_HEARTBEATS + if (s->tlsext_hb_pending) { + s->tlsext_hb_pending = 0; + return dtls1_heartbeat(s); + } +#endif + + dtls1_start_timer(s); + return dtls1_retransmit_buffered_messages(s); +} + +static void get_current_time(struct timeval *t) +{ +#if defined(_WIN32) + SYSTEMTIME st; + union { + unsigned __int64 ul; + FILETIME ft; + } now; + + GetSystemTime(&st); + SystemTimeToFileTime(&st, &now.ft); +# ifdef __MINGW32__ + now.ul -= 116444736000000000ULL; +# else + now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */ +# endif + t->tv_sec = (long)(now.ul / 10000000); + t->tv_usec = ((int)(now.ul % 10000000)) / 10; +#elif defined(OPENSSL_SYS_VMS) + 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; + + /* Ensure there is no state left over from a previous invocation */ + if (!SSL_clear(s)) + return -1; + + SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE); + s->d1->listen = 1; + + ret = SSL_accept(s); + if (ret <= 0) + return ret; + + (void)BIO_dgram_get_peer(SSL_get_rbio(s), client); + return 1; +} + +static int 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 */ + + if (!dtls1_buffer_message(s, 0)) + return 0; - if (ciph != NULL) - { - if (ciph->algorithm_enc == SSL_RC4) - return NULL; - } + return 1; +} - return ciph; - } +static int dtls1_handshake_write(SSL *s) +{ + return dtls1_do_write(s, SSL3_RT_HANDSHAKE); +}