|
- /* 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 <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
- #include <stdio.h>
- #include <string.h>
-
- #include <openssl/buf.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
- #include <openssl/rand.h>
-
- #include "internal.h"
-
-
- static int do_ssl3_write(SSL *ssl, 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->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 *ssl, int type, const void *buf_, int len) {
- const uint8_t *buf = buf_;
- unsigned tot, n, nw;
-
- ssl->rwstate = SSL_NOTHING;
- assert(ssl->s3->wnum <= INT_MAX);
- tot = ssl->s3->wnum;
- ssl->s3->wnum = 0;
-
- if (!ssl->in_handshake && SSL_in_init(ssl) && !SSL_in_false_start(ssl)) {
- int ret = ssl->handshake_func(ssl);
- if (ret < 0) {
- return ret;
- }
- if (ret == 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 = ssl->max_send_fragment;
- if (n > max) {
- nw = max;
- } else {
- nw = n;
- }
-
- int ret = do_ssl3_write(ssl, type, &buf[tot], nw);
- if (ret <= 0) {
- ssl->s3->wnum = tot;
- return ret;
- }
-
- if (ret == (int)n || (type == SSL3_RT_APPLICATION_DATA &&
- (ssl->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) {
- return tot + ret;
- }
-
- n -= ret;
- tot += ret;
- }
- }
-
- static int ssl3_write_pending(SSL *ssl, int type, const uint8_t *buf,
- unsigned int len) {
- if (ssl->s3->wpend_tot > (int)len ||
- (ssl->s3->wpend_buf != buf &&
- !(ssl->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) ||
- ssl->s3->wpend_type != type) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_WRITE_RETRY);
- return -1;
- }
-
- int ret = ssl_write_buffer_flush(ssl);
- if (ret <= 0) {
- return ret;
- }
- return ssl->s3->wpend_ret;
- }
-
- /* do_ssl3_write writes an SSL record of the given type. */
- static int do_ssl3_write(SSL *ssl, 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(ssl)) {
- return ssl3_write_pending(ssl, type, buf, len);
- }
-
- /* If we have an alert to send, lets send it */
- if (ssl->s3->alert_dispatch) {
- int ret = ssl->method->ssl_dispatch_alert(ssl);
- 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(ssl);
- 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(ssl, &out, max_out) ||
- !tls_seal_record(ssl, out, &ciphertext_len, max_out, type, buf, len)) {
- return -1;
- }
- ssl_write_buffer_set_len(ssl, ciphertext_len);
-
- /* memorize arguments so that ssl3_write_pending can detect bad write retries
- * later */
- ssl->s3->wpend_tot = len;
- ssl->s3->wpend_buf = buf;
- ssl->s3->wpend_type = type;
- ssl->s3->wpend_ret = len;
-
- /* we now just need to write the buffer */
- return ssl3_write_pending(ssl, type, buf, len);
- }
-
- 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);
- }
-
- int ssl3_read_change_cipher_spec(SSL *ssl) {
- uint8_t byte;
- int ret = ssl3_read_bytes(ssl, SSL3_RT_CHANGE_CIPHER_SPEC, &byte, 1 /* len */,
- 0 /* no peek */);
- if (ret <= 0) {
- return ret;
- }
- assert(ret == 1);
-
- if (ssl->s3->rrec.length != 0 || byte != SSL3_MT_CCS) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_CHANGE_CIPHER_SPEC);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- return -1;
- }
-
- if (ssl->msg_callback != NULL) {
- ssl->msg_callback(0, ssl->version, SSL3_RT_CHANGE_CIPHER_SPEC, &byte, 1,
- ssl, ssl->msg_callback_arg);
- }
-
- return 1;
- }
-
- 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;
- case ssl_renegotiate_ignore:
- 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_CHANGE_CIPHER_SPEC (when ssl3_read_change_cipher_spec calls us)
- * - SSL3_RT_APPLICATION_DATA (when ssl3_read_app_data 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) or renegotiation requests. */
- int ssl3_read_bytes(SSL *ssl, 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 &&
- type != SSL3_RT_CHANGE_CIPHER_SPEC) ||
- (peek && type != SSL3_RT_APPLICATION_DATA)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- /* This may require multiple iterations. False Start will cause
- * |ssl->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 (!ssl->in_handshake && SSL_in_init(ssl)) {
- assert(type == SSL3_RT_APPLICATION_DATA);
- i = ssl->handshake_func(ssl);
- if (i < 0) {
- return i;
- }
- if (i == 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
- return -1;
- }
- }
-
- start:
- ssl->rwstate = SSL_NOTHING;
-
- /* ssl->s3->rrec.type - is the type of record
- * ssl->s3->rrec.data - data
- * ssl->s3->rrec.off - offset into 'data' for next read
- * ssl->s3->rrec.length - number of bytes. */
- rr = &ssl->s3->rrec;
-
- /* get new packet if necessary */
- if (rr->length == 0) {
- ret = ssl3_get_record(ssl);
- if (ret <= 0) {
- return ret;
- }
- }
-
- /* we now have a packet which can be read and processed */
-
- /* If the other end has shut down, throw anything we read away (even in
- * 'peek' mode) */
- if (ssl->shutdown & SSL_RECEIVED_SHUTDOWN) {
- rr->length = 0;
- ssl->rwstate = SSL_NOTHING;
- return 0;
- }
-
- if (type != 0 && type == rr->type) {
- ssl->s3->warning_alert_count = 0;
-
- /* Make sure that we are not getting application data when we are doing a
- * handshake for the first time. */
- if (SSL_in_init(ssl) && type == SSL3_RT_APPLICATION_DATA &&
- ssl->s3->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, n);
- if (!peek) {
- rr->length -= n;
- rr->data += n;
- if (rr->length == 0) {
- /* The record has been consumed, so we may now clear the buffer. */
- ssl_read_buffer_discard(ssl);
- }
- }
-
- return n;
- }
-
- /* Process unexpected records. */
-
- if (type == SSL3_RT_APPLICATION_DATA && 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 (ssl->server || !ssl3_can_renegotiate(ssl)) {
- al = SSL_AD_NO_RENEGOTIATION;
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
- goto f_err;
- }
-
- /* This must be a HelloRequest, possibly fragmented over multiple records.
- * Consume data from the handshake protocol until it is complete. */
- static const uint8_t kHelloRequest[] = {SSL3_MT_HELLO_REQUEST, 0, 0, 0};
- while (ssl->s3->hello_request_len < sizeof(kHelloRequest)) {
- if (rr->length == 0) {
- /* Get a new record. */
- goto start;
- }
- if (rr->data[0] != kHelloRequest[ssl->s3->hello_request_len]) {
- al = SSL_AD_DECODE_ERROR;
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_HELLO_REQUEST);
- goto f_err;
- }
- rr->data++;
- rr->length--;
- ssl->s3->hello_request_len++;
- }
- ssl->s3->hello_request_len = 0;
-
- if (ssl->msg_callback) {
- ssl->msg_callback(0, ssl->version, SSL3_RT_HANDSHAKE, kHelloRequest,
- sizeof(kHelloRequest), ssl, ssl->msg_callback_arg);
- }
-
- if (!SSL_is_init_finished(ssl) || !ssl->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;
- }
-
- if (ssl->renegotiate_mode == ssl_renegotiate_ignore) {
- goto start;
- }
-
- /* 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(ssl)) {
- al = SSL_AD_NO_RENEGOTIATION;
- OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
- goto f_err;
- }
-
- /* Begin a new handshake. */
- ssl->s3->total_renegotiations++;
- ssl->state = SSL_ST_CONNECT;
- i = ssl->handshake_func(ssl);
- 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 (ssl->msg_callback) {
- ssl->msg_callback(0, ssl->version, SSL3_RT_ALERT, rr->data, 2, ssl,
- ssl->msg_callback_arg);
- }
- const uint8_t alert_level = rr->data[0];
- const uint8_t alert_descr = rr->data[1];
- rr->length -= 2;
- rr->data += 2;
-
- if (ssl->info_callback != NULL) {
- cb = ssl->info_callback;
- } else if (ssl->ctx->info_callback != NULL) {
- cb = ssl->ctx->info_callback;
- }
-
- if (cb != NULL) {
- uint16_t alert = (alert_level << 8) | alert_descr;
- cb(ssl, SSL_CB_READ_ALERT, alert);
- }
-
- if (alert_level == SSL3_AL_WARNING) {
- ssl->s3->warn_alert = alert_descr;
- if (alert_descr == SSL_AD_CLOSE_NOTIFY) {
- ssl->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;
- }
-
- ssl->s3->warning_alert_count++;
- if (ssl->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];
-
- ssl->rwstate = SSL_NOTHING;
- ssl->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);
- ssl->shutdown |= SSL_RECEIVED_SHUTDOWN;
- SSL_CTX_remove_session(ssl->ctx, ssl->session);
- return 0;
- } else {
- al = SSL_AD_ILLEGAL_PARAMETER;
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_ALERT_TYPE);
- goto f_err;
- }
-
- goto start;
- }
-
- if (ssl->shutdown & SSL_SENT_SHUTDOWN) {
- /* close_notify has been sent, so discard all records other than alerts. */
- rr->length = 0;
- goto start;
- }
-
- al = SSL_AD_UNEXPECTED_MESSAGE;
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_RECORD);
-
- f_err:
- ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
- err:
- return -1;
- }
-
- int ssl3_send_alert(SSL *ssl, int level, int desc) {
- /* If a fatal one, remove from cache */
- if (level == 2 && ssl->session != NULL) {
- SSL_CTX_remove_session(ssl->ctx, ssl->session);
- }
-
- ssl->s3->alert_dispatch = 1;
- ssl->s3->send_alert[0] = level;
- ssl->s3->send_alert[1] = desc;
- if (!ssl_write_buffer_is_pending(ssl)) {
- /* Nothing is being written out, so the alert may be dispatched
- * immediately. */
- return ssl->method->ssl_dispatch_alert(ssl);
- }
-
- /* else data is still being written out, we will get written some time in the
- * future */
- return -1;
- }
-
- int ssl3_dispatch_alert(SSL *ssl) {
- ssl->s3->alert_dispatch = 0;
- int ret = do_ssl3_write(ssl, SSL3_RT_ALERT, &ssl->s3->send_alert[0], 2);
- if (ret <= 0) {
- ssl->s3->alert_dispatch = 1;
- return ret;
- }
-
- /* If the alert is fatal, flush the BIO now. */
- if (ssl->s3->send_alert[0] == SSL3_AL_FATAL) {
- BIO_flush(ssl->wbio);
- }
-
- if (ssl->msg_callback != NULL) {
- ssl->msg_callback(1 /* write */, ssl->version, SSL3_RT_ALERT,
- ssl->s3->send_alert, 2, ssl, ssl->msg_callback_arg);
- }
-
- void (*cb)(const SSL *ssl, int type, int value) = NULL;
- if (ssl->info_callback != NULL) {
- cb = ssl->info_callback;
- } else if (ssl->ctx->info_callback != NULL) {
- cb = ssl->ctx->info_callback;
- }
-
- if (cb != NULL) {
- int alert = (ssl->s3->send_alert[0] << 8) | ssl->s3->send_alert[1];
- cb(ssl, SSL_CB_WRITE_ALERT, alert);
- }
-
- return 1;
- }
|