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-rw-r--r--openssl/ssl/s23_srvr.c581
1 files changed, 581 insertions, 0 deletions
diff --git a/openssl/ssl/s23_srvr.c b/openssl/ssl/s23_srvr.c
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+++ b/openssl/ssl/s23_srvr.c
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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) 1998-2001 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 SSL_METHOD *ssl23_get_server_method(int ver);
+int ssl23_get_client_hello(SSL *s);
+static SSL_METHOD *ssl23_get_server_method(int ver)
+ {
+#ifndef OPENSSL_NO_SSL2
+ if (ver == SSL2_VERSION)
+ return(SSLv2_server_method());
+#endif
+ if (ver == SSL3_VERSION)
+ return(SSLv3_server_method());
+ else if (ver == TLS1_VERSION)
+ return(TLSv1_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))
+ {
+ 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)
+ {
+ char buf_space[11]; /* 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= &(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 */
+ if (!(s->options & SSL_OP_NO_SSLv2))
+ type=1;
+ }
+ else if (p[3] == SSL3_VERSION_MAJOR)
+ {
+ v[0]=p[3]; v[1]=p[4];
+ /* SSLv3/TLSv1 */
+ if (p[4] >= TLS1_VERSION_MINOR)
+ {
+ 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_SSLv2))
+ {
+ type=1;
+ }
+ }
+ 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_SSLv2))
+ type=1;
+
+ }
+ }
+ else if ((p[0] == SSL3_RT_HANDSHAKE) &&
+ (p[1] == SSL3_VERSION_MAJOR) &&
+ (p[5] == SSL3_MT_CLIENT_HELLO) &&
+ ((p[3] == 0 && p[4] < 5 /* silly record length? */)
+ || (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 assume TLS 1.0 to avoid protocol version downgrade
+ * attacks. */
+ if (p[3] == 0 && p[4] < 6)
+ {
+#if 0
+ SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
+ goto err;
+#else
+ v[1] = TLS1_VERSION_MINOR;
+#endif
+ }
+ else
+ v[1]=p[10]; /* minor version according to client_version */
+ if (v[1] >= TLS1_VERSION_MINOR)
+ {
+ 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;
+ }
+ }
+
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode() && (s->version < TLS1_VERSION))
+ {
+ SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
+ SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
+ goto err;
+ }
+#endif
+
+ 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];
+
+ 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;
+ }
+
+ j=ssl23_read_bytes(s,n+2);
+ if (j <= 0) return(j);
+
+ ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
+ if (s->msg_callback)
+ s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
+
+ 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)
+ {
+ 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;
+
+ 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 == 1)
+ {
+#ifdef OPENSSL_NO_SSL2
+ SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
+ goto err;
+#else
+ /* we are talking sslv2 */
+ /* we need to clean up the SSLv3/TLSv1 setup and put in the
+ * sslv2 stuff. */
+
+ if (s->s2 == NULL)
+ {
+ if (!ssl2_new(s))
+ goto err;
+ }
+ else
+ ssl2_clear(s);
+
+ if (s->s3 != NULL) ssl3_free(s);
+
+ if (!BUF_MEM_grow_clean(s->init_buf,
+ SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
+ {
+ goto err;
+ }
+
+ s->state=SSL2_ST_GET_CLIENT_HELLO_A;
+ if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
+ s->s2->ssl2_rollback=0;
+ else
+ /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
+ * (SSL 3.0 draft/RFC 2246, App. E.2) */
+ s->s2->ssl2_rollback=1;
+
+ /* setup the n bytes we have read so we get them from
+ * the sslv2 buffer */
+ s->rstate=SSL_ST_READ_HEADER;
+ s->packet_length=n;
+ s->packet= &(s->s2->rbuf[0]);
+ memcpy(s->packet,buf,n);
+ s->s2->rbuf_left=n;
+ s->s2->rbuf_offs=0;
+
+ s->method=SSLv2_server_method();
+ s->handshake_func=s->method->ssl_accept;
+#endif
+ }
+
+ if ((type == 2) || (type == 3))
+ {
+ /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
+
+ 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;
+ 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;
+ }
+
+ if (s->version == TLS1_VERSION)
+ s->method = TLSv1_server_method();
+ else
+ s->method = SSLv3_server_method();
+#if 0 /* ssl3_get_client_hello does this */
+ s->client_version=(v[0]<<8)|v[1];
+#endif
+ s->handshake_func=s->method->ssl_accept;
+ }
+
+ if ((type < 1) || (type > 3))
+ {
+ /* 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);
+ }
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 06:59:04 +0000