emtpy fragments are not necessary for SSL_eNULL
[openssl.git] / ssl / t1_enc.c
index c37b41775fd426d4de094f8117248c56c6e67ca8..1f6bb2edf39ae28caa16deba3883d820cf472435 100644 (file)
  * 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 <stdio.h>
 #include <openssl/comp.h>
@@ -78,16 +131,16 @@ static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 
        HMAC_CTX_init(&ctx);
        HMAC_CTX_init(&ctx_tmp);
-       HMAC_Init(&ctx,sec,sec_len,md);
-       HMAC_Init(&ctx_tmp,sec,sec_len,md);
+       HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
+       HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
        HMAC_Update(&ctx,seed,seed_len);
        HMAC_Final(&ctx,A1,&A1_len);
 
        n=0;
        for (;;)
                {
-               HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
-               HMAC_Init(&ctx_tmp,NULL,0,NULL); /* re-init */
+               HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
+               HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
                HMAC_Update(&ctx,A1,A1_len);
                HMAC_Update(&ctx_tmp,A1,A1_len);
                HMAC_Update(&ctx,seed,seed_len);
@@ -180,9 +233,10 @@ int tls1_change_cipher_state(SSL *s, int which)
        const EVP_CIPHER *c;
        const SSL_COMP *comp;
        const EVP_MD *m;
-       int _exp,n,i,j,k,exp_label_len,cl;
+       int is_export,n,i,j,k,exp_label_len,cl;
+       int reuse_dd = 0;
 
-       _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
+       is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
        c=s->s3->tmp.new_sym_enc;
        m=s->s3->tmp.new_hash;
        comp=s->s3->tmp.new_compression;
@@ -205,9 +259,9 @@ int tls1_change_cipher_state(SSL *s, int which)
 
        if (which & SSL3_CC_READ)
                {
-               if ((s->enc_read_ctx == NULL) &&
-                       ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
-                       OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
+               if (s->enc_read_ctx != NULL)
+                       reuse_dd = 1;
+               else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
                        goto err;
                dd= s->enc_read_ctx;
                s->read_hash=m;
@@ -235,6 +289,10 @@ int tls1_change_cipher_state(SSL *s, int which)
                }
        else
                {
+               if (s->enc_write_ctx != NULL)
+                       reuse_dd = 1;
+               else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
+                       goto err;
                if ((s->enc_write_ctx == NULL) &&
                        ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
                        OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
@@ -259,13 +317,15 @@ int tls1_change_cipher_state(SSL *s, int which)
                mac_secret= &(s->s3->write_mac_secret[0]);
                }
 
+       if (reuse_dd)
+               EVP_CIPHER_CTX_cleanup(dd);
        EVP_CIPHER_CTX_init(dd);
 
        p=s->s3->tmp.key_block;
        i=EVP_MD_size(m);
        cl=EVP_CIPHER_key_length(c);
-       j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
-                 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
+       j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
+                      cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
        /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
        k=EVP_CIPHER_iv_length(c);
        er1= &(s->s3->client_random[0]);
@@ -302,7 +362,7 @@ int tls1_change_cipher_state(SSL *s, int which)
 printf("which = %04X\nmac key=",which);
 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 #endif
-       if (_exp)
+       if (is_export)
                {
                /* In here I set both the read and write key/iv to the
                 * same value since only the correct one will be used :-).
@@ -341,7 +401,7 @@ printf("which = %04X\nmac key=",which);
 #ifdef KSSL_DEBUG
        {
         int i;
-       printf("EVP_CipherInit(dd,c,key=,iv=,which)\n");
+       printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
        printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
        printf("\n");
        printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
@@ -349,7 +409,7 @@ printf("which = %04X\nmac key=",which);
        }
 #endif /* KSSL_DEBUG */
 
-       EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
+       EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 #ifdef TLS_DEBUG
 printf("which = %04X\nkey=",which);
 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
@@ -423,6 +483,25 @@ printf("\nkey block\n");
 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 #endif
 
+       if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
+               {
+               /* enable vulnerability countermeasure for CBC ciphers with
+                * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
+                */
+               s->s3->need_empty_fragments = 1;
+
+               if (s->session->cipher != NULL)
+                       {
+                       if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
+                               s->s3->need_empty_fragments = 0;
+                       
+#ifndef OPENSSL_NO_RC4
+                       if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
+                               s->s3->need_empty_fragments = 0;
+#endif
+                       }
+               }
+               
        return(1);
 err:
        SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
@@ -645,7 +724,7 @@ int tls1_mac(SSL *ssl, unsigned char *md, int send)
 
        /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
        HMAC_CTX_init(&hmac);
-       HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
+       HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
        HMAC_Update(&hmac,seq,8);
        HMAC_Update(&hmac,buf,5);
        HMAC_Update(&hmac,rec->input,rec->length);