Make i2r_sctlist static.
[openssl.git] / ssl / s23_srvr.c
index 5dd9253..9d47c22 100644 (file)
  * 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 "buffer.h"
-#include "rand.h"
-#include "objects.h"
-#include "evp.h"
 #include "ssl_locl.h"
-
-#define BREAK break
-
-#ifndef NOPROTO
-static SSL_METHOD *ssl23_get_server_method(int ver);
-int ssl23_get_client_hello(SSL *s);
-#else
-static SSL_METHOD *ssl23_get_server_method();
-int ssl23_get_client_hello();
+#include <openssl/buffer.h>
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#ifdef OPENSSL_FIPS
+#include <openssl/fips.h>
 #endif
 
-static SSL_METHOD *ssl23_get_server_method(ver)
-int ver;
+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_SSL2
        if (ver == SSL2_VERSION)
                return(SSLv2_server_method());
-       else if (ver == SSL3_VERSION)
+#endif
+       if (ver == SSL3_VERSION)
                return(SSLv3_server_method());
        else 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);
        }
 
-SSL_METHOD *SSLv23_server_method()
-       {
-       static int init=1;
-       static SSL_METHOD SSLv23_server_data;
-
-       if (init)
-               {
-               init=0;
-               memcpy((char *)&SSLv23_server_data,
-                       (char *)sslv23_base_method(),sizeof(SSL_METHOD));
-               SSLv23_server_data.ssl_accept=ssl23_accept;
-               SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
-               }
-       return(&SSLv23_server_data);
-       }
+IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
+                       ssl23_accept,
+                       ssl_undefined_function,
+                       ssl23_get_server_method)
 
-int ssl23_accept(s)
-SSL *s;
+int ssl23_accept(SSL *s)
        {
        BUF_MEM *buf;
-       unsigned long Time=time(NULL);
-       void (*cb)()=NULL;
+       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_seed((unsigned char *)&Time,sizeof(Time));
+       RAND_add(&Time,sizeof(Time),0);
        ERR_clear_error();
        clear_sys_error();
 
@@ -120,8 +161,8 @@ SSL *s;
        else if (s->ctx->info_callback != NULL)
                cb=s->ctx->info_callback;
        
-       if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
        s->in_handshake++;
+       if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
 
        for (;;)
                {
@@ -134,6 +175,7 @@ SSL *s;
                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; */
@@ -157,7 +199,7 @@ SSL *s;
                        ssl3_init_finished_mac(s);
 
                        s->state=SSL23_ST_SR_CLNT_HELLO_A;
-                       s->ctx->sess_accept++;
+                       s->ctx->stats.sess_accept++;
                        s->init_num=0;
                        break;
 
@@ -186,31 +228,45 @@ SSL *s;
                        }
                }
 end:
+       s->in_handshake--;
        if (cb != NULL)
                cb(s,SSL_CB_ACCEPT_EXIT,ret);
-       s->in_handshake--;
        return(ret);
        }
 
 
-int ssl23_get_client_hello(s)
-SSL *s;
+int ssl23_get_client_hello(SSL *s)
        {
-       char buf_space[8];
+       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,*dd;
+       unsigned char *p,*d,*d_len,*dd;
        unsigned int i;
        unsigned int csl,sil,cl;
-       int n=0,j,tls1=0;
-       int type=0,use_sslv2_strong=0;
+       int n=0,j;
+       int type=0;
+       int v[2];
 
-       /* read the initial header */
        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,7);
-               if (n != 7) return(n);
+               n=ssl23_read_bytes(s, sizeof buf_space);
+               if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 
                p=s->packet;
 
@@ -218,25 +274,45 @@ SSL *s;
 
                if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
                        {
-                       /* SSLv2 header */
+                       /*
+                        * 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))
+                                       if (p[4] >= TLS1_2_VERSION_MINOR &&
+                                          !(s->options & SSL_OP_NO_TLSv1_2))
                                                {
-                                               tls1=1;
+                                               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_SSLv2))
@@ -245,81 +321,94 @@ SSL *s;
                                                }
                                        }
                                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;
 
-                               if (s->options & SSL_OP_NON_EXPORT_FIRST)
-                                       {
-                                       STACK *sk;
-                                       SSL_CIPHER *c;
-                                       int ne2,ne3;
-
-                                       j=((p[0]&0x7f)<<8)|p[1];
-                                       if (j > (1024*4))
-                                               {
-                                               SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
-                                               goto err;
-                                               }
-
-                                       n=ssl23_read_bytes(s,j+2);
-                                       if (n <= 0) return(n);
-                                       p=s->packet;
-
-                                       if ((buf=Malloc(n)) == NULL)
-                                               {
-                                               SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
-                                               goto err;
-                                               }
-                                       memcpy(buf,p,n);
-
-                                       p+=5;
-                                       n2s(p,csl);
-                                       p+=4;
-
-                                       sk=ssl_bytes_to_cipher_list(
-                                               s,p,csl,NULL);
-                                       if (sk != NULL)
-                                               {
-                                               ne2=ne3=0;
-                                               for (j=0; j<sk_num(sk); j++)
-                                                       {
-                                                       c=(SSL_CIPHER *)sk_value(sk,j);
-                                                       if (!(c->algorithms & SSL_EXP))
-                                                               {
-                                                               if ((c->id>>24L) == 2L)
-                                                                       ne2=1;
-                                                               else
-                                                                       ne3=1;
-                                                               }
-                                                       }
-                                               if (ne2 && !ne3)
-                                                       {
-                                                       type=1;
-                                                       use_sslv2_strong=1;
-                                                       goto next_bit;
-                                                       }
-                                               }
-                                       }
                                }
                        }
                else if ((p[0] == SSL3_RT_HANDSHAKE) &&
                         (p[1] == SSL3_VERSION_MAJOR) &&
-                        (p[5] == SSL3_MT_CLIENT_HELLO))
+                        (p[5] == SSL3_MT_CLIENT_HELLO) &&
+                        ((p[3] == 0 && p[4] < 5 /* silly record length? */)
+                               || (p[9] >= p[1])))
                        {
-                       /* true SSLv3 or tls1 */
-                       if (p[2] >= TLS1_VERSION_MINOR)
+                       /*
+                        * 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 (!(s->options & SSL_OP_NO_TLSv1))
+#if 0
+                               SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
+                               goto err;
+#else
+                               v[1] = TLS1_VERSION_MINOR;
+#endif
+                               }
+                       /* 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....
+                        */
+                       else 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;
-                                       tls1=1;
                                        }
                                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 (!(s->options & SSL_OP_NO_SSLv3))
-                               type=3;
                        }
                else if ((strncmp("GET ", (char *)p,4) == 0) ||
                         (strncmp("POST ",(char *)p,5) == 0) ||
@@ -336,12 +425,32 @@ SSL *s;
                        }
                }
 
-next_bit:
+       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;
+               }
+
+#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 a SSLv3/TLSv1 in a SSLv2 header */
+               /* 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))
                        {
@@ -352,7 +461,9 @@ next_bit:
                j=ssl23_read_bytes(s,n+2);
                if (j <= 0) return(j);
 
-               ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
+               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;
@@ -360,20 +471,26 @@ next_bit:
                n2s(p,sil);
                n2s(p,cl);
                d=(unsigned char *)s->init_buf->data;
-               if ((csl+sil+cl+11) != s->packet_length)
+               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;
                        }
 
-               *(d++)=SSL3_VERSION_MAJOR;
-               if (tls1)
-                       *(d++)=TLS1_VERSION_MINOR;
-               else
-                       *(d++)=SSL3_VERSION_MINOR;
+               /* 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 chalenge_length */
+               /* 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);
@@ -399,7 +516,17 @@ next_bit:
                *(d++)=1;
                *(d++)=0;
                
-               i=(d-(unsigned char *)s->init_buf->data);
+#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;
@@ -407,8 +534,15 @@ next_bit:
                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. */
@@ -423,20 +557,21 @@ next_bit:
 
                if (s->s3 != NULL) ssl3_free(s);
 
-               if (!BUF_MEM_grow(s->init_buf,
+               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_MSIE_SSLV2_RSA_PADDING) ||
-                       use_sslv2_strong)
+               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 5 bytes we have read so we get them from
+               /* 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;
@@ -447,11 +582,12 @@ next_bit:
 
                s->method=SSLv2_server_method();
                s->handshake_func=s->method->ssl_accept;
+#endif
                }
 
        if ((type == 2) || (type == 3))
                {
-               /* we have SSLv3/TLSv1 */
+               /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 
                if (!ssl_init_wbio_buffer(s,1)) goto err;
 
@@ -464,6 +600,10 @@ next_bit:
                         * 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;
@@ -475,17 +615,17 @@ next_bit:
                        s->s3->rbuf.left=0;
                        s->s3->rbuf.offset=0;
                        }
-
-               if (tls1)
-                       {
-                       s->version=TLS1_VERSION;
-                       s->method=TLSv1_server_method();
-                       }
+               if (s->version == TLS1_2_VERSION)
+                       s->method = TLSv1_2_server_method();
+               else if (s->version == TLS1_1_VERSION)
+                       s->method = TLSv1_1_server_method();
+               else if (s->version == TLS1_VERSION)
+                       s->method = TLSv1_server_method();
                else
-                       {
-                       s->version=SSL3_VERSION;
-                       s->method=SSLv3_server_method();
-                       }
+                       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;
                }
        
@@ -497,11 +637,9 @@ next_bit:
                }
        s->init_num=0;
 
-       if (buf != buf_space) Free(buf);
-       s->first_packet=1;
+       if (buf != buf_space) OPENSSL_free(buf);
        return(SSL_accept(s));
 err:
-       if (buf != buf_space) Free(buf);
+       if (buf != buf_space) OPENSSL_free(buf);
        return(-1);
        }
-