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author | William Joye <wjoye@cfa.harvard.edu> | 2017-05-02 16:41:35 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-05-02 16:41:35 (GMT) |
commit | 3d328008deedc58cd7a11c79063cefa7d662d4fc (patch) | |
tree | cb41a048885ce7b493f406360cf5f6edf689c468 /openssl/ssl/d1_lib.c | |
parent | 0a2b8b8e0bc2e91a9f10659b30e2e4f5b79ce692 (diff) | |
download | blt-3d328008deedc58cd7a11c79063cefa7d662d4fc.zip blt-3d328008deedc58cd7a11c79063cefa7d662d4fc.tar.gz blt-3d328008deedc58cd7a11c79063cefa7d662d4fc.tar.bz2 |
inital commit
Diffstat (limited to 'openssl/ssl/d1_lib.c')
-rw-r--r-- | openssl/ssl/d1_lib.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/openssl/ssl/d1_lib.c b/openssl/ssl/d1_lib.c new file mode 100644 index 0000000..debd4fd --- /dev/null +++ b/openssl/ssl/d1_lib.c @@ -0,0 +1,588 @@ +/* ssl/d1_lib.c */ +/* + * 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 <stdio.h> +#define USE_SOCKETS +#include <openssl/objects.h> +#include "ssl_locl.h" + +#if defined(OPENSSL_SYS_VMS) +# include <sys/timeb.h> +#endif + +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); +const char dtls1_version_str[] = "DTLSv1" OPENSSL_VERSION_PTEXT; +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) + 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); + } + + d1->link_mtu = 0; + d1->mtu = 0; + + 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); + return (0); + } + + s->d1 = d1; + s->method->ssl_clear(s); + return (1); +} + +static void dtls1_clear_queues(SSL *s) +{ + pitem *item = 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_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); + } + + dtls1_clear_received_buffer(s); + dtls1_clear_sent_buffer(s); +} + +void dtls1_clear_received_buffer(SSL *s) +{ + pitem *item = NULL; + hm_fragment *frag = NULL; + + while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) { + frag = (hm_fragment *)item->data; + dtls1_hm_fragment_free(frag); + pitem_free(item); + } +} + +void dtls1_clear_sent_buffer(SSL *s) +{ + pitem *item = NULL; + hm_fragment *frag = NULL; + + while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) { + frag = (hm_fragment *)item->data; + dtls1_hm_fragment_free(frag); + 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; + unsigned int link_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; + 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->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->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 + * 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) +{ +#ifndef OPENSSL_NO_SCTP + /* Disable timer for SCTP */ + if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { + memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); + 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(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_sent_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 */ + SSL_clear(s); + + 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 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); +} |