X-Git-Url: https://git.openssl.org/gitweb/?a=blobdiff_plain;f=ssl%2Fstatem%2Fstatem.c;h=8a251ea1e7ad4c6235f1374fa82b59c1b6ad4a8f;hb=f7e393be4725c33739d46a58de94a06ebdc6e49d;hp=bc3fc54fabf3b86ec115ff779e131f722db7236e;hpb=d99b0691d3a5d215e8d4dbe1b7224e066153fe2c;p=openssl.git diff --git a/ssl/statem/statem.c b/ssl/statem/statem.c index bc3fc54fab..8a251ea1e7 100644 --- a/ssl/statem/statem.c +++ b/ssl/statem/statem.c @@ -1,59 +1,10 @@ -/* ssl/statem/statem.c */ /* - * Written by Matt Caswell for the OpenSSL project. - */ -/* ==================================================================== - * Copyright (c) 1998-2015 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 2015-2016 The OpenSSL Project Authors. All Rights Reserved. * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include @@ -95,7 +46,7 @@ */ /* Sub state machine return values */ -typedef enum { +typedef enum { /* Something bad happened or NBIO */ SUB_STATE_ERROR, /* Sub state finished go to the next sub state */ @@ -154,8 +105,8 @@ void ossl_statem_clear(SSL *s) */ void ossl_statem_set_renegotiate(SSL *s) { - s->statem.state = MSG_FLOW_RENEGOTIATE; s->statem.in_init = 1; + s->statem.request_state = TLS_ST_SW_HELLO_REQ; } /* @@ -200,6 +151,37 @@ void ossl_statem_set_in_handshake(SSL *s, int inhand) s->statem.in_handshake--; } +/* Are we in a sensible state to skip over unreadable early data? */ +int ossl_statem_skip_early_data(SSL *s) +{ + if (s->ext.early_data != SSL_EARLY_DATA_REJECTED) + return 0; + + if (s->hello_retry_request) { + if (s->statem.hand_state != TLS_ST_SW_HELLO_RETRY_REQUEST) + return 0; + } else { + if (!s->server || s->statem.hand_state != TLS_ST_EARLY_DATA) + return 0; + } + + return 1; +} + +void ossl_statem_check_finish_init(SSL *s, int send) +{ + if (!s->server) { + if ((send && s->statem.hand_state == TLS_ST_PENDING_EARLY_DATA_END + && s->early_data_state != SSL_EARLY_DATA_WRITING) + || (!send && s->statem.hand_state == TLS_ST_EARLY_DATA)) + ossl_statem_set_in_init(s, 1); + } else { + if (s->early_data_state == SSL_EARLY_DATA_FINISHED_READING + && s->statem.hand_state == TLS_ST_EARLY_DATA) + ossl_statem_set_in_init(s, 1); + } +} + void ossl_statem_set_hello_verify_done(SSL *s) { s->statem.state = MSG_FLOW_UNINITED; @@ -214,7 +196,8 @@ void ossl_statem_set_hello_verify_done(SSL *s) s->statem.hand_state = TLS_ST_SR_CLNT_HELLO; } -int ossl_statem_connect(SSL *s) { +int ossl_statem_connect(SSL *s) +{ return state_machine(s, 0); } @@ -223,7 +206,9 @@ int ossl_statem_accept(SSL *s) return state_machine(s, 1); } -static void (*get_callback(SSL *s))(const SSL *, int, int) +typedef void (*info_cb) (const SSL *, int, int); + +static info_cb get_callback(SSL *s) { if (s->info_callback != NULL) return s->info_callback; @@ -235,10 +220,10 @@ static void (*get_callback(SSL *s))(const SSL *, int, int) /* * The main message flow state machine. We start in the MSG_FLOW_UNINITED or - * MSG_FLOW_RENEGOTIATE state and finish in MSG_FLOW_FINISHED. Valid states and + * MSG_FLOW_FINISHED state and finish in MSG_FLOW_FINISHED. Valid states and * transitions are as follows: * - * MSG_FLOW_UNINITED MSG_FLOW_RENEGOTIATE + * MSG_FLOW_UNINITED MSG_FLOW_FINISHED * | | * +-----------------------+ * v @@ -261,7 +246,8 @@ static void (*get_callback(SSL *s))(const SSL *, int, int) * 1: Success * <=0: NBIO or error */ -static int state_machine(SSL *s, int server) { +static int state_machine(SSL *s, int server) +{ BUF_MEM *buf = NULL; unsigned long Time = (unsigned long)time(NULL); void (*cb) (const SSL *ssl, int type, int val) = NULL; @@ -285,7 +271,6 @@ static int state_machine(SSL *s, int server) { if (!SSL_clear(s)) return -1; } - #ifndef OPENSSL_NO_SCTP if (SSL_IS_DTLS(s)) { /* @@ -297,31 +282,12 @@ static int state_machine(SSL *s, int server) { } #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) { - if (SSL_IS_DTLS(s)) - dtls1_stop_timer(s); - s->tlsext_hb_pending = 0; - s->tlsext_hb_seq++; - } -#endif - /* Initialise state machine */ - - if (st->state == MSG_FLOW_RENEGOTIATE) { - s->renegotiate = 1; - if (!server) - s->ctx->stats.sess_connect_renegotiate++; - } - - if (st->state == MSG_FLOW_UNINITED || st->state == MSG_FLOW_RENEGOTIATE) { + if (st->state == MSG_FLOW_UNINITED + || st->state == MSG_FLOW_FINISHED) { if (st->state == MSG_FLOW_UNINITED) { st->hand_state = TLS_ST_BEFORE; + st->request_state = TLS_ST_BEFORE; } s->server = server; @@ -330,25 +296,20 @@ static int state_machine(SSL *s, int server) { if (SSL_IS_DTLS(s)) { if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) && - (server - || (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00))) { + (server || (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00))) { SSLerr(SSL_F_STATE_MACHINE, ERR_R_INTERNAL_ERROR); goto end; } } else { - if ((s->version >> 8) != SSL3_VERSION_MAJOR - && s->version != TLS_ANY_VERSION) { + if ((s->version >> 8) != SSL3_VERSION_MAJOR) { SSLerr(SSL_F_STATE_MACHINE, ERR_R_INTERNAL_ERROR); goto end; } } - if (!SSL_IS_DTLS(s)) { - if (s->version != TLS_ANY_VERSION && - !ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) { - SSLerr(SSL_F_STATE_MACHINE, SSL_R_VERSION_TOO_LOW); - goto end; - } + if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) { + SSLerr(SSL_F_STATE_MACHINE, SSL_R_VERSION_TOO_LOW); + goto end; } if (s->init_buf == NULL) { @@ -372,64 +333,34 @@ static int state_machine(SSL *s, int server) { */ s->s3->change_cipher_spec = 0; - if (!server || st->state != MSG_FLOW_RENEGOTIATE) { - /* - * Ok, we now need to push on a buffering BIO ...but not with - * SCTP - */ + /* + * Ok, we now need to push on a buffering BIO ...but not with + * SCTP + */ #ifndef OPENSSL_NO_SCTP - if (!SSL_IS_DTLS(s) || !BIO_dgram_is_sctp(SSL_get_wbio(s))) + if (!SSL_IS_DTLS(s) || !BIO_dgram_is_sctp(SSL_get_wbio(s))) #endif - if (!ssl_init_wbio_buffer(s, server ? 1 : 0)) { - goto end; - } - - ssl3_init_finished_mac(s); - } + if (!ssl_init_wbio_buffer(s)) { + goto end; + } - if (server) { - if (st->state != MSG_FLOW_RENEGOTIATE) { - s->ctx->stats.sess_accept++; - } else if (!s->s3->send_connection_binding && - !(s->options & - SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { - /* - * Server attempting to renegotiate with client that doesn't - * support secure renegotiation. - */ - SSLerr(SSL_F_STATE_MACHINE, - SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); - ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); + if ((SSL_in_before(s)) + || s->renegotiate) { + if (!tls_setup_handshake(s)) { ossl_statem_set_error(s); goto end; - } else { - /* - * st->state == MSG_FLOW_RENEGOTIATE, we will just send a - * HelloRequest - */ - s->ctx->stats.sess_accept_renegotiate++; } - } else { - s->ctx->stats.sess_connect++; - /* mark client_random uninitialized */ - memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); - s->hit = 0; - - s->s3->tmp.cert_request = 0; - - if (SSL_IS_DTLS(s)) { - st->use_timer = 1; - } + if (SSL_IS_FIRST_HANDSHAKE(s)) + st->read_state_first_init = 1; } st->state = MSG_FLOW_WRITING; init_write_state_machine(s); - st->read_state_first_init = 1; } - while(st->state != MSG_FLOW_FINISHED) { - if(st->state == MSG_FLOW_READING) { + while (st->state != MSG_FLOW_FINISHED) { + if (st->state == MSG_FLOW_READING) { ssret = read_state_machine(s); if (ssret == SUB_STATE_FINISHED) { st->state = MSG_FLOW_WRITING; @@ -456,7 +387,6 @@ static int state_machine(SSL *s, int server) { } } - st->state = MSG_FLOW_UNINITED; ret = 1; end: @@ -493,6 +423,21 @@ static void init_read_state_machine(SSL *s) st->read_state = READ_STATE_HEADER; } +static int grow_init_buf(SSL *s, size_t size) { + + size_t msg_offset = (char *)s->init_msg - s->init_buf->data; + + if (!BUF_MEM_grow_clean(s->init_buf, (int)size)) + return 0; + + if (size < msg_offset) + return 0; + + s->init_msg = s->init_buf->data + msg_offset; + + return 1; +} + /* * This function implements the sub-state machine when the message flow is in * MSG_FLOW_READING. The valid sub-states and transitions are: @@ -515,24 +460,25 @@ static void init_read_state_machine(SSL *s) * READ_STATE_POST_PROCESS is an optional step that may occur if some post * processing activity performed on the message may block. * - * Any of the above states could result in an NBIO event occuring in which case + * Any of the above states could result in an NBIO event occurring in which case * control returns to the calling application. When this function is recalled we * will resume in the same state where we left off. */ -static SUB_STATE_RETURN read_state_machine(SSL *s) { +static SUB_STATE_RETURN read_state_machine(SSL *s) +{ OSSL_STATEM *st = &s->statem; int ret, mt; - unsigned long len = 0; - int (*transition)(SSL *s, int mt); + size_t len = 0; + int (*transition) (SSL *s, int mt); PACKET pkt; - MSG_PROCESS_RETURN (*process_message)(SSL *s, PACKET *pkt); - WORK_STATE (*post_process_message)(SSL *s, WORK_STATE wst); - unsigned long (*max_message_size)(SSL *s); + MSG_PROCESS_RETURN(*process_message) (SSL *s, PACKET *pkt); + WORK_STATE(*post_process_message) (SSL *s, WORK_STATE wst); + size_t (*max_message_size) (SSL *s); void (*cb) (const SSL *ssl, int type, int val) = NULL; cb = get_callback(s); - if(s->server) { + if (s->server) { transition = ossl_statem_server_read_transition; process_message = ossl_statem_server_process_message; max_message_size = ossl_statem_server_max_message_size; @@ -549,10 +495,9 @@ static SUB_STATE_RETURN read_state_machine(SSL *s) { st->read_state_first_init = 0; } - while(1) { - switch(st->read_state) { + while (1) { + switch (st->read_state) { case READ_STATE_HEADER: - s->init_num = 0; /* Get the state the peer wants to move to */ if (SSL_IS_DTLS(s)) { /* @@ -579,9 +524,8 @@ static SUB_STATE_RETURN read_state_machine(SSL *s) { * Validate that we are allowed to move to the new state and move * to that state if so */ - if(!transition(s, mt)) { - ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); - SSLerr(SSL_F_READ_STATE_MACHINE, SSL_R_UNEXPECTED_MESSAGE); + if (!transition(s, mt)) { + ossl_statem_set_error(s); return SUB_STATE_ERROR; } @@ -591,6 +535,16 @@ static SUB_STATE_RETURN read_state_machine(SSL *s) { return SUB_STATE_ERROR; } + /* dtls_get_message already did this */ + if (!SSL_IS_DTLS(s) + && s->s3->tmp.message_size > 0 + && !grow_init_buf(s, s->s3->tmp.message_size + + SSL3_HM_HEADER_LENGTH)) { + ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); + SSLerr(SSL_F_READ_STATE_MACHINE, ERR_R_BUF_LIB); + return SUB_STATE_ERROR; + } + st->read_state = READ_STATE_BODY; /* Fall through */ @@ -611,29 +565,38 @@ static SUB_STATE_RETURN read_state_machine(SSL *s) { return SUB_STATE_ERROR; } ret = process_message(s, &pkt); - if (ret == MSG_PROCESS_ERROR) { + + /* Discard the packet data */ + s->init_num = 0; + + switch (ret) { + case MSG_PROCESS_ERROR: return SUB_STATE_ERROR; - } - if (ret == MSG_PROCESS_FINISHED_READING) { + case MSG_PROCESS_FINISHED_READING: if (SSL_IS_DTLS(s)) { dtls1_stop_timer(s); } return SUB_STATE_FINISHED; - } - if (ret == MSG_PROCESS_CONTINUE_PROCESSING) { + case MSG_PROCESS_CONTINUE_PROCESSING: st->read_state = READ_STATE_POST_PROCESS; st->read_state_work = WORK_MORE_A; - } else { + break; + + default: st->read_state = READ_STATE_HEADER; + break; } break; case READ_STATE_POST_PROCESS: st->read_state_work = post_process_message(s, st->read_state_work); - switch(st->read_state_work) { - default: + switch (st->read_state_work) { + case WORK_ERROR: + case WORK_MORE_A: + case WORK_MORE_B: + case WORK_MORE_C: return SUB_STATE_ERROR; case WORK_FINISHED_CONTINUE: @@ -666,7 +629,7 @@ static int statem_do_write(SSL *s) OSSL_STATEM *st = &s->statem; if (st->hand_state == TLS_ST_CW_CHANGE - || st->hand_state == TLS_ST_SW_CHANGE) { + || st->hand_state == TLS_ST_SW_CHANGE) { if (SSL_IS_DTLS(s)) return dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC); else @@ -706,7 +669,7 @@ static void init_write_state_machine(SSL *s) * WRITE_STATE_TRANSITION transitions the state of the handshake state machine * WRITE_STATE_PRE_WORK performs any work necessary to prepare the later - * sending of the message. This could result in an NBIO event occuring in + * sending of the message. This could result in an NBIO event occurring in * which case control returns to the calling application. When this function * is recalled we will resume in the same state where we left off. * @@ -721,28 +684,33 @@ static SUB_STATE_RETURN write_state_machine(SSL *s) { OSSL_STATEM *st = &s->statem; int ret; - WRITE_TRAN (*transition)(SSL *s); - WORK_STATE (*pre_work)(SSL *s, WORK_STATE wst); - WORK_STATE (*post_work)(SSL *s, WORK_STATE wst); - int (*construct_message)(SSL *s); + WRITE_TRAN(*transition) (SSL *s); + WORK_STATE(*pre_work) (SSL *s, WORK_STATE wst); + WORK_STATE(*post_work) (SSL *s, WORK_STATE wst); + int (*get_construct_message_f) (SSL *s, WPACKET *pkt, + int (**confunc) (SSL *s, WPACKET *pkt), + int *mt); void (*cb) (const SSL *ssl, int type, int val) = NULL; + int (*confunc) (SSL *s, WPACKET *pkt); + int mt; + WPACKET pkt; cb = get_callback(s); - if(s->server) { + if (s->server) { transition = ossl_statem_server_write_transition; pre_work = ossl_statem_server_pre_work; post_work = ossl_statem_server_post_work; - construct_message = ossl_statem_server_construct_message; + get_construct_message_f = ossl_statem_server_construct_message; } else { transition = ossl_statem_client_write_transition; pre_work = ossl_statem_client_pre_work; post_work = ossl_statem_client_post_work; - construct_message = ossl_statem_client_construct_message; + get_construct_message_f = ossl_statem_client_construct_message; } - while(1) { - switch(st->write_state) { + while (1) { + switch (st->write_state) { case WRITE_STATE_TRANSITION: if (cb != NULL) { /* Notify callback of an impending state change */ @@ -751,7 +719,7 @@ static SUB_STATE_RETURN write_state_machine(SSL *s) else cb(s, SSL_CB_CONNECT_LOOP, 1); } - switch(transition(s)) { + switch (transition(s)) { case WRITE_TRAN_CONTINUE: st->write_state = WRITE_STATE_PRE_WORK; st->write_state_work = WORK_MORE_A; @@ -761,14 +729,17 @@ static SUB_STATE_RETURN write_state_machine(SSL *s) return SUB_STATE_FINISHED; break; - default: + case WRITE_TRAN_ERROR: return SUB_STATE_ERROR; } break; case WRITE_STATE_PRE_WORK: - switch(st->write_state_work = pre_work(s, st->write_state_work)) { - default: + switch (st->write_state_work = pre_work(s, st->write_state_work)) { + case WORK_ERROR: + case WORK_MORE_A: + case WORK_MORE_B: + case WORK_MORE_C: return SUB_STATE_ERROR; case WORK_FINISHED_CONTINUE: @@ -778,8 +749,25 @@ static SUB_STATE_RETURN write_state_machine(SSL *s) case WORK_FINISHED_STOP: return SUB_STATE_END_HANDSHAKE; } - if(construct_message(s) == 0) + if (!get_construct_message_f(s, &pkt, &confunc, &mt)) { + ossl_statem_set_error(s); + return SUB_STATE_ERROR; + } + if (mt == SSL3_MT_DUMMY) { + /* Skip construction and sending. This isn't a "real" state */ + st->write_state = WRITE_STATE_POST_WORK; + st->write_state_work = WORK_MORE_A; + break; + } + if (!WPACKET_init(&pkt, s->init_buf) + || !ssl_set_handshake_header(s, &pkt, mt) + || (confunc != NULL && !confunc(s, &pkt)) + || !ssl_close_construct_packet(s, &pkt, mt) + || !WPACKET_finish(&pkt)) { + WPACKET_cleanup(&pkt); + ossl_statem_set_error(s); return SUB_STATE_ERROR; + } /* Fall through */ @@ -796,8 +784,11 @@ static SUB_STATE_RETURN write_state_machine(SSL *s) /* Fall through */ case WRITE_STATE_POST_WORK: - switch(st->write_state_work = post_work(s, st->write_state_work)) { - default: + switch (st->write_state_work = post_work(s, st->write_state_work)) { + case WORK_ERROR: + case WORK_MORE_A: + case WORK_MORE_B: + case WORK_MORE_C: return SUB_STATE_ERROR; case WORK_FINISHED_CONTINUE: @@ -831,7 +822,7 @@ int statem_flush(SSL *s) /* * Called by the record layer to determine whether application data is - * allowed to be sent in the current handshake state or not. + * allowed to be received in the current handshake state or not. * * Return values are: * 1: Yes (application data allowed) @@ -841,7 +832,7 @@ int ossl_statem_app_data_allowed(SSL *s) { OSSL_STATEM *st = &s->statem; - if (st->state == MSG_FLOW_UNINITED || st->state == MSG_FLOW_RENEGOTIATE) + if (st->state == MSG_FLOW_UNINITED) return 0; if (!s->s3->in_read_app_data || (s->s3->total_renegotiations == 0)) @@ -853,7 +844,7 @@ int ossl_statem_app_data_allowed(SSL *s) * ServerHello yet then we allow app data */ if (st->hand_state == TLS_ST_BEFORE - || st->hand_state == TLS_ST_SR_CLNT_HELLO) + || st->hand_state == TLS_ST_SR_CLNT_HELLO) return 1; } else { /*