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openssl/ssl/s23_srvr.c
Rich Salz 9e9858d1cf dead code cleanup: #if 0 in ssl 
I left many "#if 0" lines, usually because I thought we would
probably want to revisit them later, or because they provided
some useful internal documentation tips.

Reviewed-by: Andy Polyakov <appro@openssl.org>
2015-02-06 10:52:12 -05:00

588 lines
21 KiB
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/* ssl/s23_srvr.c */
/* 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) 1998-2006 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>
#include "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
static const SSL_METHOD *ssl23_get_server_method(int ver);
int ssl23_get_client_hello(SSL *s);
static const SSL_METHOD *ssl23_get_server_method(int ver)
{
#ifndef OPENSSL_NO_SSL3
if (ver == SSL3_VERSION)
return (SSLv3_server_method());
#endif
if (ver == TLS1_VERSION)
return (TLSv1_server_method());
else if (ver == TLS1_1_VERSION)
return (TLSv1_1_server_method());
else if (ver == TLS1_2_VERSION)
return (TLSv1_2_server_method());
else
return (NULL);
}
IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
ssl23_accept,
ssl_undefined_function, ssl23_get_server_method)
int ssl23_accept(SSL *s)
{
BUF_MEM *buf;
unsigned long Time = (unsigned long)time(NULL);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state;
RAND_add(&Time, sizeof(Time), 0);
ERR_clear_error();
clear_sys_error();
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE | SSL_ST_ACCEPT:
case SSL_ST_OK | SSL_ST_ACCEPT:
s->server = 1;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
/* s->version=SSL3_VERSION; */
s->type = SSL_ST_ACCEPT;
if (s->init_buf == NULL) {
if ((buf = BUF_MEM_new()) == NULL) {
ret = -1;
goto end;
}
if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
BUF_MEM_free(buf);
ret = -1;
goto end;
}
s->init_buf = buf;
}
ssl3_init_finished_mac(s);
s->state = SSL23_ST_SR_CLNT_HELLO_A;
s->ctx->stats.sess_accept++;
s->init_num = 0;
break;
case SSL23_ST_SR_CLNT_HELLO_A:
case SSL23_ST_SR_CLNT_HELLO_B:
s->shutdown = 0;
ret = ssl23_get_client_hello(s);
if (ret >= 0)
cb = NULL;
goto end;
/* break; */
default:
SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
if ((cb != NULL) && (s->state != state)) {
new_state = s->state;
s->state = state;
cb(s, SSL_CB_ACCEPT_LOOP, 1);
s->state = new_state;
}
}
end:
s->in_handshake--;
if (cb != NULL)
cb(s, SSL_CB_ACCEPT_EXIT, ret);
return (ret);
}
int ssl23_get_client_hello(SSL *s)
{
/*-
* Request this many bytes in initial read.
* We can detect SSL 3.0/TLS 1.0 Client Hellos
* ('type == 3') correctly only when the following
* is in a single record, which is not guaranteed by
* the protocol specification:
* Byte Content
* 0 type \
* 1/2 version > record header
* 3/4 length /
* 5 msg_type \
* 6-8 length > Client Hello message
* 9/10 client_version /
*/
char buf_space[11];
char *buf = &(buf_space[0]);
unsigned char *p, *d, *d_len, *dd;
unsigned int i;
unsigned int csl, sil, cl;
int n = 0, j;
int type = 0;
int v[2];
if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
/* read the initial header */
v[0] = v[1] = 0;
if (!ssl3_setup_buffers(s))
goto err;
n = ssl23_read_bytes(s, sizeof buf_space);
if (n != sizeof buf_space)
return (n); /* n == -1 || n == 0 */
p = s->packet;
memcpy(buf, p, n);
if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
/*
* SSLv2 header
*/
if ((p[3] == 0x00) && (p[4] == 0x02)) {
v[0] = p[3];
v[1] = p[4];
/* SSLv2 */
} else if (p[3] == SSL3_VERSION_MAJOR) {
v[0] = p[3];
v[1] = p[4];
/* SSLv3/TLSv1 */
if (p[4] >= TLS1_VERSION_MINOR) {
if (p[4] >= TLS1_2_VERSION_MINOR &&
!(s->options & SSL_OP_NO_TLSv1_2)) {
s->version = TLS1_2_VERSION;
s->state = SSL23_ST_SR_CLNT_HELLO_B;
} else if (p[4] >= TLS1_1_VERSION_MINOR &&
!(s->options & SSL_OP_NO_TLSv1_1)) {
s->version = TLS1_1_VERSION;
/*
* type=2;
*//*
* done later to survive restarts
*/
s->state = SSL23_ST_SR_CLNT_HELLO_B;
} else if (!(s->options & SSL_OP_NO_TLSv1)) {
s->version = TLS1_VERSION;
/*
* type=2;
*//*
* done later to survive restarts
*/
s->state = SSL23_ST_SR_CLNT_HELLO_B;
} else if (!(s->options & SSL_OP_NO_SSLv3)) {
s->version = SSL3_VERSION;
/* type=2; */
s->state = SSL23_ST_SR_CLNT_HELLO_B;
}
} else if (!(s->options & SSL_OP_NO_SSLv3)) {
s->version = SSL3_VERSION;
/* type=2; */
s->state = SSL23_ST_SR_CLNT_HELLO_B;
}
}
}
/* p[4] < 5 ... silly record length? */
else if ((p[0] == SSL3_RT_HANDSHAKE) &&
(p[1] == SSL3_VERSION_MAJOR) &&
(p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5)
|| (p[9] >= p[1]))) {
/*
* SSLv3 or tls1 header
*/
v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
/*
* We must look at client_version inside the Client Hello message
* to get the correct minor version. However if we have only a
* pathologically small fragment of the Client Hello message, this
* would be difficult, and we'd have to read more records to find
* out. No known SSL 3.0 client fragments ClientHello like this,
* so we simply reject such connections to avoid protocol version
* downgrade attacks.
*/
if (p[3] == 0 && p[4] < 6) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL);
goto err;
}
/*
* if major version number > 3 set minor to a value which will
* use the highest version 3 we support. If TLS 2.0 ever appears
* we will need to revise this....
*/
if (p[9] > SSL3_VERSION_MAJOR)
v[1] = 0xff;
else
v[1] = p[10]; /* minor version according to client_version */
if (v[1] >= TLS1_VERSION_MINOR) {
if (v[1] >= TLS1_2_VERSION_MINOR &&
!(s->options & SSL_OP_NO_TLSv1_2)) {
s->version = TLS1_2_VERSION;
type = 3;
} else if (v[1] >= TLS1_1_VERSION_MINOR &&
!(s->options & SSL_OP_NO_TLSv1_1)) {
s->version = TLS1_1_VERSION;
type = 3;
} else if (!(s->options & SSL_OP_NO_TLSv1)) {
s->version = TLS1_VERSION;
type = 3;
} else if (!(s->options & SSL_OP_NO_SSLv3)) {
s->version = SSL3_VERSION;
type = 3;
}
} else {
/* client requests SSL 3.0 */
if (!(s->options & SSL_OP_NO_SSLv3)) {
s->version = SSL3_VERSION;
type = 3;
} else if (!(s->options & SSL_OP_NO_TLSv1)) {
/*
* we won't be able to use TLS of course, but this will
* send an appropriate alert
*/
s->version = TLS1_VERSION;
type = 3;
}
}
} else if ((strncmp("GET ", (char *)p, 4) == 0) ||
(strncmp("POST ", (char *)p, 5) == 0) ||
(strncmp("HEAD ", (char *)p, 5) == 0) ||
(strncmp("PUT ", (char *)p, 4) == 0)) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
goto err;
} else if (strncmp("CONNECT", (char *)p, 7) == 0) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
goto err;
}
}
/* ensure that TLS_MAX_VERSION is up-to-date */
OPENSSL_assert(s->version <= TLS_MAX_VERSION);
if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
goto err;
}
if (FIPS_mode() && (s->version < TLS1_VERSION)) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
goto err;
}
if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_VERSION_TOO_LOW);
goto err;
}
if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
/*
* we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
* state)
*/
type = 2;
p = s->packet;
v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
v[1] = p[4];
/*-
* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
* header is sent directly on the wire, not wrapped as a TLS
* record. It's format is:
* Byte Content
* 0-1 msg_length
* 2 msg_type
* 3-4 version
* 5-6 cipher_spec_length
* 7-8 session_id_length
* 9-10 challenge_length
* ... ...
*/
n = ((p[0] & 0x7f) << 8) | p[1];
if (n > (1024 * 4)) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
goto err;
}
if (n < 9) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
SSL_R_RECORD_LENGTH_MISMATCH);
goto err;
}
j = ssl23_read_bytes(s, n + 2);
/*
* We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
* s->packet_length. We have at least 11 valid packet bytes.
*/
if (j <= 0)
return (j);
ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
/* CLIENT-HELLO */
if (s->msg_callback)
s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
s->packet_length - 2, s, s->msg_callback_arg);
p = s->packet;
p += 5;
n2s(p, csl);
n2s(p, sil);
n2s(p, cl);
d = (unsigned char *)s->init_buf->data;
if ((csl + sil + cl + 11) != s->packet_length) { /* We can't have TLS
* extensions in SSL
* 2.0 format *
* Client Hello, can
* we? Error
* condition should
* be * '>'
* otherweise */
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
SSL_R_RECORD_LENGTH_MISMATCH);
goto err;
}
/* record header: msg_type ... */
*(d++) = SSL3_MT_CLIENT_HELLO;
/* ... and length (actual value will be written later) */
d_len = d;
d += 3;
/* client_version */
*(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
*(d++) = v[1];
/* lets populate the random area */
/* get the challenge_length */
i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
memset(d, 0, SSL3_RANDOM_SIZE);
memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
d += SSL3_RANDOM_SIZE;
/* no session-id reuse */
*(d++) = 0;
/* ciphers */
j = 0;
dd = d;
d += 2;
for (i = 0; i < csl; i += 3) {
if (p[i] != 0)
continue;
*(d++) = p[i + 1];
*(d++) = p[i + 2];
j += 2;
}
s2n(j, dd);
/* COMPRESSION */
*(d++) = 1;
*(d++) = 0;
#if 0
/* copy any remaining data with may be extensions */
p = p + csl + sil + cl;
while (p < s->packet + s->packet_length) {
*(d++) = *(p++);
}
#endif
i = (d - (unsigned char *)s->init_buf->data) - 4;
l2n3((long)i, d_len);
/* get the data reused from the init_buf */
s->s3->tmp.reuse_message = 1;
s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
s->s3->tmp.message_size = i;
}
/* imaginary new state (for program structure): */
/* s->state = SSL23_SR_CLNT_HELLO_C */
if ((type == 2) || (type == 3)) {
/*
* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
*/
const SSL_METHOD *new_method;
new_method = ssl23_get_server_method(s->version);
if (new_method == NULL) {
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
goto err;
}
s->method = new_method;
if (!ssl_init_wbio_buffer(s, 1))
goto err;
/* we are in this state */
s->state = SSL3_ST_SR_CLNT_HELLO_A;
if (type == 3) {
/*
* put the 'n' bytes we have read into the input buffer for SSLv3
*/
s->rstate = SSL_ST_READ_HEADER;
s->packet_length = n;
if (s->s3->rbuf.buf == NULL)
if (!ssl3_setup_read_buffer(s))
goto err;
s->packet = &(s->s3->rbuf.buf[0]);
memcpy(s->packet, buf, n);
s->s3->rbuf.left = n;
s->s3->rbuf.offset = 0;
} else {
s->packet_length = 0;
s->s3->rbuf.left = 0;
s->s3->rbuf.offset = 0;
}
s->handshake_func = s->method->ssl_accept;
} else {
/* bad, very bad */
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
goto err;
}
s->init_num = 0;
if (buf != buf_space)
OPENSSL_free(buf);
return (SSL_accept(s));
err:
if (buf != buf_space)
OPENSSL_free(buf);
return (-1);
}
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