/* 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.] */ /* ==================================================================== * Copyright (c) 1998-2002 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 #include #include #include #include #include #include #include #include #include #include "internal.h" static int do_ssl3_write(SSL *s, int type, const uint8_t *buf, unsigned len); /* kMaxWarningAlerts is the number of consecutive warning alerts that will be * processed. */ static const uint8_t kMaxWarningAlerts = 4; /* ssl3_get_record reads a new input record. On success, it places it in * |ssl->s3->rrec| and returns one. Otherwise it returns <= 0 on error or if * more data is needed. */ static int ssl3_get_record(SSL *ssl) { int ret; again: /* Ensure the buffer is large enough to decrypt in-place. */ ret = ssl_read_buffer_extend_to(ssl, ssl_record_prefix_len(ssl)); if (ret <= 0) { return ret; } assert(ssl_read_buffer_len(ssl) >= ssl_record_prefix_len(ssl)); uint8_t *out = ssl_read_buffer(ssl) + ssl_record_prefix_len(ssl); size_t max_out = ssl_read_buffer_len(ssl) - ssl_record_prefix_len(ssl); uint8_t type, alert; size_t len, consumed; switch (tls_open_record(ssl, &type, out, &len, &consumed, &alert, max_out, ssl_read_buffer(ssl), ssl_read_buffer_len(ssl))) { case ssl_open_record_success: ssl_read_buffer_consume(ssl, consumed); if (len > 0xffff) { OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); return -1; } SSL3_RECORD *rr = &ssl->s3->rrec; rr->type = type; rr->length = (uint16_t)len; rr->off = 0; rr->data = out; return 1; case ssl_open_record_partial: ret = ssl_read_buffer_extend_to(ssl, consumed); if (ret <= 0) { return ret; } goto again; case ssl_open_record_discard: ssl_read_buffer_consume(ssl, consumed); goto again; case ssl_open_record_error: ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); return -1; } assert(0); OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return -1; } int ssl3_write_app_data(SSL *ssl, const void *buf, int len) { return ssl3_write_bytes(ssl, SSL3_RT_APPLICATION_DATA, buf, len); } /* Call this to write data in records of type |type|. It will return <= 0 if * not all data has been sent or non-blocking IO. */ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) { const uint8_t *buf = buf_; unsigned int tot, n, nw; int i; s->rwstate = SSL_NOTHING; assert(s->s3->wnum <= INT_MAX); tot = s->s3->wnum; s->s3->wnum = 0; if (!s->in_handshake && SSL_in_init(s) && !SSL_in_false_start(s)) { i = s->handshake_func(s); if (i < 0) { return i; } if (i == 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE); return -1; } } /* Ensure that if we end up with a smaller value of data to write out than * the the original len from a write which didn't complete for non-blocking * I/O and also somehow ended up avoiding the check for this in * ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be possible to * end up with (len-tot) as a large number that will then promptly send * beyond the end of the users buffer ... so we trap and report the error in * a way the user will notice. */ if (len < 0 || (size_t)len < tot) { OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH); return -1; } n = (len - tot); for (;;) { /* max contains the maximum number of bytes that we can put into a * record. */ unsigned max = s->max_send_fragment; if (n > max) { nw = max; } else { nw = n; } i = do_ssl3_write(s, type, &buf[tot], nw); if (i <= 0) { s->s3->wnum = tot; return i; } if (i == (int)n || (type == SSL3_RT_APPLICATION_DATA && (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) { return tot + i; } n -= i; tot += i; } } /* do_ssl3_write writes an SSL record of the given type. */ static int do_ssl3_write(SSL *s, int type, const uint8_t *buf, unsigned len) { /* If there is still data from the previous record, flush it. */ if (ssl_write_buffer_is_pending(s)) { return ssl3_write_pending(s, type, buf, len); } /* If we have an alert to send, lets send it */ if (s->s3->alert_dispatch) { int ret = s->method->ssl_dispatch_alert(s); if (ret <= 0) { return ret; } /* if it went, fall through and send more stuff */ } if (len > SSL3_RT_MAX_PLAIN_LENGTH) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return -1; } if (len == 0) { return 0; } size_t max_out = len + ssl_max_seal_overhead(s); if (max_out < len) { OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); return -1; } uint8_t *out; size_t ciphertext_len; if (!ssl_write_buffer_init(s, &out, max_out) || !tls_seal_record(s, out, &ciphertext_len, max_out, type, buf, len)) { return -1; } ssl_write_buffer_set_len(s, ciphertext_len); /* memorize arguments so that ssl3_write_pending can detect bad write retries * later */ s->s3->wpend_tot = len; s->s3->wpend_buf = buf; s->s3->wpend_type = type; s->s3->wpend_ret = len; /* we now just need to write the buffer */ return ssl3_write_pending(s, type, buf, len); } int ssl3_write_pending(SSL *s, int type, const uint8_t *buf, unsigned int len) { if (s->s3->wpend_tot > (int)len || (s->s3->wpend_buf != buf && !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) || s->s3->wpend_type != type) { OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_WRITE_RETRY); return -1; } int ret = ssl_write_buffer_flush(s); if (ret <= 0) { return ret; } return s->s3->wpend_ret; } /* ssl3_expect_change_cipher_spec informs the record layer that a * ChangeCipherSpec record is required at this point. If a Handshake record is * received before ChangeCipherSpec, the connection will fail. Moreover, if * there are unprocessed handshake bytes, the handshake will also fail and the * function returns zero. Otherwise, the function returns one. */ int ssl3_expect_change_cipher_spec(SSL *s) { if (s->s3->handshake_fragment_len > 0 || s->s3->tmp.reuse_message) { OPENSSL_PUT_ERROR(SSL, SSL_R_UNPROCESSED_HANDSHAKE_DATA); return 0; } s->s3->flags |= SSL3_FLAGS_EXPECT_CCS; return 1; } int ssl3_read_app_data(SSL *ssl, uint8_t *buf, int len, int peek) { return ssl3_read_bytes(ssl, SSL3_RT_APPLICATION_DATA, buf, len, peek); } void ssl3_read_close_notify(SSL *ssl) { ssl3_read_bytes(ssl, 0, NULL, 0, 0); } static int ssl3_can_renegotiate(SSL *ssl) { switch (ssl->renegotiate_mode) { case ssl_renegotiate_never: return 0; case ssl_renegotiate_once: return ssl->s3->total_renegotiations == 0; case ssl_renegotiate_freely: return 1; } assert(0); return 0; } /* Return up to 'len' payload bytes received in 'type' records. * 'type' is one of the following: * * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) * - 0 (during a shutdown, no data has to be returned) * * If we don't have stored data to work from, read a SSL/TLS record first * (possibly multiple records if we still don't have anything to return). * * This function must handle any surprises the peer may have for us, such as * Alert records (e.g. close_notify), ChangeCipherSpec records (not really * a surprise, but handled as if it were), or renegotiation requests. * Also if record payloads contain fragments too small to process, we store * them until there is enough for the respective protocol (the record protocol * may use arbitrary fragmentation and even interleaving): * Change cipher spec protocol * just 1 byte needed, no need for keeping anything stored * Alert protocol * 2 bytes needed (AlertLevel, AlertDescription) * Handshake protocol * 4 bytes needed (HandshakeType, uint24 length) -- we just have * to detect unexpected Client Hello and Hello Request messages * here, anything else is handled by higher layers * Application data protocol * none of our business */ int ssl3_read_bytes(SSL *s, int type, uint8_t *buf, int len, int peek) { int al, i, ret; unsigned int n; SSL3_RECORD *rr; void (*cb)(const SSL *ssl, int type, int value) = NULL; if ((type && type != SSL3_RT_APPLICATION_DATA && type != SSL3_RT_HANDSHAKE) || (peek && type != SSL3_RT_APPLICATION_DATA)) { OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); return -1; } if (type == SSL3_RT_HANDSHAKE && s->s3->handshake_fragment_len > 0) { /* (partially) satisfy request from storage */ uint8_t *src = s->s3->handshake_fragment; uint8_t *dst = buf; unsigned int k; /* peek == 0 */ n = 0; while (len > 0 && s->s3->handshake_fragment_len > 0) { *dst++ = *src++; len--; s->s3->handshake_fragment_len--; n++; } /* move any remaining fragment bytes: */ for (k = 0; k < s->s3->handshake_fragment_len; k++) { s->s3->handshake_fragment[k] = *src++; } return n; } /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ /* This may require multiple iterations. False Start will cause * |s->handshake_func| to signal success one step early, but the handshake * must be completely finished before other modes are accepted. * * TODO(davidben): Move this check up to a higher level. */ while (!s->in_handshake && SSL_in_init(s)) { assert(type == SSL3_RT_APPLICATION_DATA); i = s->handshake_func(s); if (i < 0) { return i; } if (i == 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE); return -1; } } start: s->rwstate = SSL_NOTHING; /* s->s3->rrec.type - is the type of record * s->s3->rrec.data - data * s->s3->rrec.off - offset into 'data' for next read * s->s3->rrec.length - number of bytes. */ rr = &s->s3->rrec; /* get new packet if necessary */ if (rr->length == 0) { ret = ssl3_get_record(s); if (ret <= 0) { return ret; } } /* we now have a packet which can be read and processed */ /* |change_cipher_spec is set when we receive a ChangeCipherSpec and reset by * ssl3_get_finished. */ if (s->s3->change_cipher_spec && rr->type != SSL3_RT_HANDSHAKE && rr->type != SSL3_RT_ALERT) { al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); goto f_err; } /* If we are expecting a ChangeCipherSpec, it is illegal to receive a * Handshake record. */ if (rr->type == SSL3_RT_HANDSHAKE && (s->s3->flags & SSL3_FLAGS_EXPECT_CCS)) { al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_RECORD_BEFORE_CCS); goto f_err; } /* If the other end has shut down, throw anything we read away (even in * 'peek' mode) */ if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { rr->length = 0; s->rwstate = SSL_NOTHING; return 0; } if (type != 0 && type == rr->type) { s->s3->warning_alert_count = 0; /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ /* make sure that we are not getting application data when we are doing a * handshake for the first time */ if (SSL_in_init(s) && type == SSL3_RT_APPLICATION_DATA && s->aead_read_ctx == NULL) { /* TODO(davidben): Is this check redundant with the handshake_func * check? */ al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_APP_DATA_IN_HANDSHAKE); goto f_err; } /* Discard empty records. */ if (rr->length == 0) { goto start; } if (len <= 0) { return len; } if ((unsigned int)len > rr->length) { n = rr->length; } else { n = (unsigned int)len; } memcpy(buf, &(rr->data[rr->off]), n); if (!peek) { rr->length -= n; rr->off += n; if (rr->length == 0) { rr->off = 0; /* The record has been consumed, so we may now clear the buffer. */ ssl_read_buffer_discard(s); } } return n; } /* Process unexpected records. */ if (rr->type == SSL3_RT_HANDSHAKE) { /* If peer renegotiations are disabled, all out-of-order handshake records * are fatal. Renegotiations as a server are never supported. */ if (s->server || !ssl3_can_renegotiate(s)) { al = SSL_AD_NO_RENEGOTIATION; OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION); goto f_err; } /* HelloRequests may be fragmented across multiple records. */ const size_t size = sizeof(s->s3->handshake_fragment); const size_t avail = size - s->s3->handshake_fragment_len; const size_t todo = (rr->length < avail) ? rr->length : avail; memcpy(s->s3->handshake_fragment + s->s3->handshake_fragment_len, &rr->data[rr->off], todo); rr->off += todo; rr->length -= todo; s->s3->handshake_fragment_len += todo; if (s->s3->handshake_fragment_len < size) { goto start; /* fragment was too small */ } /* Parse out and consume a HelloRequest. */ if (s->s3->handshake_fragment[0] != SSL3_MT_HELLO_REQUEST || s->s3->handshake_fragment[1] != 0 || s->s3->handshake_fragment[2] != 0 || s->s3->handshake_fragment[3] != 0) { al = SSL_AD_DECODE_ERROR; OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_HELLO_REQUEST); goto f_err; } s->s3->handshake_fragment_len = 0; if (s->msg_callback) { s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg); } if (!SSL_is_init_finished(s) || !s->s3->initial_handshake_complete) { /* This cannot happen. If a handshake is in progress, |type| must be * |SSL3_RT_HANDSHAKE|. */ assert(0); OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); goto err; } /* Renegotiation is only supported at quiescent points in the application * protocol, namely in HTTPS, just before reading the HTTP response. Require * the record-layer be idle and avoid complexities of sending a handshake * record while an application_data record is being written. */ if (ssl_write_buffer_is_pending(s)) { al = SSL_AD_NO_RENEGOTIATION; OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION); goto f_err; } /* Begin a new handshake. */ s->s3->total_renegotiations++; s->state = SSL_ST_CONNECT; i = s->handshake_func(s); if (i < 0) { return i; } if (i == 0) { OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE); return -1; } /* The handshake completed synchronously. Continue reading records. */ goto start; } /* If an alert record, process one alert out of the record. Note that we allow * a single record to contain multiple alerts. */ if (rr->type == SSL3_RT_ALERT) { /* Alerts may not be fragmented. */ if (rr->length < 2) { al = SSL_AD_DECODE_ERROR; OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ALERT); goto f_err; } if (s->msg_callback) { s->msg_callback(0, s->version, SSL3_RT_ALERT, &rr->data[rr->off], 2, s, s->msg_callback_arg); } const uint8_t alert_level = rr->data[rr->off++]; const uint8_t alert_descr = rr->data[rr->off++]; rr->length -= 2; if (s->info_callback != NULL) { cb = s->info_callback; } else if (s->ctx->info_callback != NULL) { cb = s->ctx->info_callback; } if (cb != NULL) { uint16_t alert = (alert_level << 8) | alert_descr; cb(s, SSL_CB_READ_ALERT, alert); } if (alert_level == SSL3_AL_WARNING) { s->s3->warn_alert = alert_descr; if (alert_descr == SSL_AD_CLOSE_NOTIFY) { s->shutdown |= SSL_RECEIVED_SHUTDOWN; return 0; } /* This is a warning but we receive it if we requested renegotiation and * the peer denied it. Terminate with a fatal alert because if * application tried to renegotiatie it presumably had a good reason and * expects it to succeed. * * In future we might have a renegotiation where we don't care if the * peer refused it where we carry on. */ else if (alert_descr == SSL_AD_NO_RENEGOTIATION) { al = SSL_AD_HANDSHAKE_FAILURE; OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION); goto f_err; } s->s3->warning_alert_count++; if (s->s3->warning_alert_count > kMaxWarningAlerts) { al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_WARNING_ALERTS); goto f_err; } } else if (alert_level == SSL3_AL_FATAL) { char tmp[16]; s->rwstate = SSL_NOTHING; s->s3->fatal_alert = alert_descr; OPENSSL_PUT_ERROR(SSL, SSL_AD_REASON_OFFSET + alert_descr); BIO_snprintf(tmp, sizeof(tmp), "%d", alert_descr); ERR_add_error_data(2, "SSL alert number ", tmp); s->shutdown |= SSL_RECEIVED_SHUTDOWN; SSL_CTX_remove_session(s->ctx, s->session); return 0; } else { al = SSL_AD_ILLEGAL_PARAMETER; OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_ALERT_TYPE); goto f_err; } goto start; } if (s->shutdown & SSL_SENT_SHUTDOWN) { /* close_notify has been sent, so discard all records other than alerts. */ rr->length = 0; goto start; } if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { /* 'Change Cipher Spec' is just a single byte, so we know exactly what the * record payload has to look like */ if (rr->length != 1 || rr->off != 0 || rr->data[0] != SSL3_MT_CCS) { al = SSL_AD_ILLEGAL_PARAMETER; OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_CHANGE_CIPHER_SPEC); goto f_err; } /* Check we have a cipher to change to */ if (s->s3->tmp.new_cipher == NULL) { al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_CCS_RECEIVED_EARLY); goto f_err; } if (!(s->s3->flags & SSL3_FLAGS_EXPECT_CCS)) { al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_CCS_RECEIVED_EARLY); goto f_err; } s->s3->flags &= ~SSL3_FLAGS_EXPECT_CCS; rr->length = 0; if (s->msg_callback) { s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); } s->s3->change_cipher_spec = 1; if (!ssl3_do_change_cipher_spec(s)) { goto err; } else { goto start; } } /* We already handled these. */ assert(rr->type != SSL3_RT_CHANGE_CIPHER_SPEC && rr->type != SSL3_RT_ALERT && rr->type != SSL3_RT_HANDSHAKE); al = SSL_AD_UNEXPECTED_MESSAGE; OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return -1; } int ssl3_do_change_cipher_spec(SSL *s) { int i; if (s->state & SSL_ST_ACCEPT) { i = SSL3_CHANGE_CIPHER_SERVER_READ; } else { i = SSL3_CHANGE_CIPHER_CLIENT_READ; } if (s->s3->tmp.key_block == NULL) { if (s->session == NULL || s->session->master_key_length == 0) { /* might happen if dtls1_read_bytes() calls this */ OPENSSL_PUT_ERROR(SSL, SSL_R_CCS_RECEIVED_EARLY); return 0; } s->session->cipher = s->s3->tmp.new_cipher; if (!s->enc_method->setup_key_block(s)) { return 0; } } if (!s->enc_method->change_cipher_state(s, i)) { return 0; } return 1; } int ssl3_send_alert(SSL *s, int level, int desc) { /* Map tls/ssl alert value to correct one */ desc = s->enc_method->alert_value(desc); if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) { /* SSL 3.0 does not have protocol_version alerts */ desc = SSL_AD_HANDSHAKE_FAILURE; } if (desc < 0) { return -1; } /* If a fatal one, remove from cache */ if (level == 2 && s->session != NULL) { SSL_CTX_remove_session(s->ctx, s->session); } s->s3->alert_dispatch = 1; s->s3->send_alert[0] = level; s->s3->send_alert[1] = desc; if (!ssl_write_buffer_is_pending(s)) { /* Nothing is being written out, so the alert may be dispatched * immediately. */ return s->method->ssl_dispatch_alert(s); } /* else data is still being written out, we will get written some time in the * future */ return -1; } int ssl3_dispatch_alert(SSL *s) { int i, j; void (*cb)(const SSL *ssl, int type, int value) = NULL; s->s3->alert_dispatch = 0; i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2); if (i <= 0) { s->s3->alert_dispatch = 1; } else { /* Alert sent to BIO. If it is important, flush it now. If the message * does not get sent due to non-blocking IO, we will not worry too much. */ if (s->s3->send_alert[0] == SSL3_AL_FATAL) { BIO_flush(s->wbio); } if (s->msg_callback) { s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); } if (s->info_callback != NULL) { cb = s->info_callback; } else if (s->ctx->info_callback != NULL) { cb = s->ctx->info_callback; } if (cb != NULL) { j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1]; cb(s, SSL_CB_WRITE_ALERT, j); } } return i; }