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openssl/ssl/t1_enc.c
Dr. Stephen Henson aeb9ccfaad And so it begins...
2007-03-22 00:39:24 +00:00

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/* ssl/t1_enc.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) 1998-2002 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 "ssl_locl.h"
#include <openssl/comp.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
int sec_len, unsigned char *seed, int seed_len,
unsigned char *out, int olen)
{
int chunk,n;
unsigned int j;
HMAC_CTX ctx;
HMAC_CTX ctx_tmp;
unsigned char A1[EVP_MAX_MD_SIZE];
unsigned int A1_len;
chunk=EVP_MD_size(md);
HMAC_CTX_init(&ctx);
HMAC_CTX_init(&ctx_tmp);
HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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_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);
if (olen > chunk)
{
HMAC_Final(&ctx,out,&j);
out+=j;
olen-=j;
HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
}
else /* last one */
{
HMAC_Final(&ctx,A1,&A1_len);
memcpy(out,A1,olen);
break;
}
}
HMAC_CTX_cleanup(&ctx);
HMAC_CTX_cleanup(&ctx_tmp);
OPENSSL_cleanse(A1,sizeof(A1));
}
static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
unsigned char *label, int label_len,
const unsigned char *sec, int slen, unsigned char *out1,
unsigned char *out2, int olen)
{
int len,i;
const unsigned char *S1,*S2;
len=slen/2;
S1=sec;
S2= &(sec[len]);
len+=(slen&1); /* add for odd, make longer */
tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
for (i=0; i<olen; i++)
out1[i]^=out2[i];
}
static void tls1_generate_key_block(SSL *s, unsigned char *km,
unsigned char *tmp, int num)
{
unsigned char *p;
unsigned char buf[SSL3_RANDOM_SIZE*2+
TLS_MD_MAX_CONST_SIZE];
p=buf;
memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
TLS_MD_KEY_EXPANSION_CONST_SIZE);
p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
s->session->master_key,s->session->master_key_length,
km,tmp,num);
#ifdef KSSL_DEBUG
printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
s->session->master_key_length);
{
int i;
for (i=0; i < s->session->master_key_length; i++)
{
printf("%02X", s->session->master_key[i]);
}
printf("\n"); }
#endif /* KSSL_DEBUG */
}
int tls1_change_cipher_state(SSL *s, int which)
{
static const unsigned char empty[]="";
unsigned char *p,*key_block,*mac_secret;
unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
SSL3_RANDOM_SIZE*2];
unsigned char tmp1[EVP_MAX_KEY_LENGTH];
unsigned char tmp2[EVP_MAX_KEY_LENGTH];
unsigned char iv1[EVP_MAX_IV_LENGTH*2];
unsigned char iv2[EVP_MAX_IV_LENGTH*2];
unsigned char *ms,*key,*iv,*er1,*er2;
int client_write;
EVP_CIPHER_CTX *dd;
const EVP_CIPHER *c;
#ifndef OPENSSL_NO_COMP
const SSL_COMP *comp;
#endif
const EVP_MD *m;
int is_export,n,i,j,k,exp_label_len,cl;
int reuse_dd = 0;
is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
c=s->s3->tmp.new_sym_enc;
m=s->s3->tmp.new_hash;
#ifndef OPENSSL_NO_COMP
comp=s->s3->tmp.new_compression;
#endif
key_block=s->s3->tmp.key_block;
#ifdef KSSL_DEBUG
printf("tls1_change_cipher_state(which= %d) w/\n", which);
printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
comp);
printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
c->nid,c->block_size,c->key_len,c->iv_len);
printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
{
int i;
for (i=0; i<s->s3->tmp.key_block_length; i++)
printf("%02x", key_block[i]); printf("\n");
}
#endif /* KSSL_DEBUG */
if (which & SSL3_CC_READ)
{
if (s->enc_read_ctx != NULL)
reuse_dd = 1;
else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
goto err;
else
/* make sure it's intialized in case we exit later with an error */
EVP_CIPHER_CTX_init(s->enc_read_ctx);
dd= s->enc_read_ctx;
s->read_hash=m;
#ifndef OPENSSL_NO_COMP
if (s->expand != NULL)
{
COMP_CTX_free(s->expand);
s->expand=NULL;
}
if (comp != NULL)
{
s->expand=COMP_CTX_new(comp->method);
if (s->expand == NULL)
{
SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
goto err2;
}
if (s->s3->rrec.comp == NULL)
s->s3->rrec.comp=(unsigned char *)
OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
if (s->s3->rrec.comp == NULL)
goto err;
}
#endif
/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
if (s->version != DTLS1_VERSION)
memset(&(s->s3->read_sequence[0]),0,8);
mac_secret= &(s->s3->read_mac_secret[0]);
}
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;
else
/* make sure it's intialized in case we exit later with an error */
EVP_CIPHER_CTX_init(s->enc_write_ctx);
dd= s->enc_write_ctx;
s->write_hash=m;
#ifndef OPENSSL_NO_COMP
if (s->compress != NULL)
{
COMP_CTX_free(s->compress);
s->compress=NULL;
}
if (comp != NULL)
{
s->compress=COMP_CTX_new(comp->method);
if (s->compress == NULL)
{
SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
goto err2;
}
}
#endif
/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
if (s->version != DTLS1_VERSION)
memset(&(s->s3->write_sequence[0]),0,8);
mac_secret= &(s->s3->write_mac_secret[0]);
}
if (reuse_dd)
EVP_CIPHER_CTX_cleanup(dd);
p=s->s3->tmp.key_block;
i=EVP_MD_size(m);
cl=EVP_CIPHER_key_length(c);
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]);
er2= &(s->s3->server_random[0]);
if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
(which == SSL3_CHANGE_CIPHER_SERVER_READ))
{
ms= &(p[ 0]); n=i+i;
key= &(p[ n]); n+=j+j;
iv= &(p[ n]); n+=k+k;
exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
client_write=1;
}
else
{
n=i;
ms= &(p[ n]); n+=i+j;
key= &(p[ n]); n+=j+k;
iv= &(p[ n]); n+=k;
exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
client_write=0;
}
if (n > s->s3->tmp.key_block_length)
{
SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
goto err2;
}
memcpy(mac_secret,ms,i);
#ifdef TLS_DEBUG
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 (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 :-).
*/
p=buf;
memcpy(p,exp_label,exp_label_len);
p+=exp_label_len;
memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
tmp1,tmp2,EVP_CIPHER_key_length(c));
key=tmp1;
if (k > 0)
{
p=buf;
memcpy(p,TLS_MD_IV_BLOCK_CONST,
TLS_MD_IV_BLOCK_CONST_SIZE);
p+=TLS_MD_IV_BLOCK_CONST_SIZE;
memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
iv1,iv2,k*2);
if (client_write)
iv=iv1;
else
iv= &(iv1[k]);
}
}
s->session->key_arg_length=0;
#ifdef KSSL_DEBUG
{
int i;
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]);
printf("\n");
}
#endif /* KSSL_DEBUG */
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'); }
printf("\niv=");
{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
printf("\n");
#endif
OPENSSL_cleanse(tmp1,sizeof(tmp1));
OPENSSL_cleanse(tmp2,sizeof(tmp1));
OPENSSL_cleanse(iv1,sizeof(iv1));
OPENSSL_cleanse(iv2,sizeof(iv2));
return(1);
err:
SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
err2:
return(0);
}
int tls1_setup_key_block(SSL *s)
{
unsigned char *p1,*p2;
const EVP_CIPHER *c;
const EVP_MD *hash;
int num;
SSL_COMP *comp;
#ifdef KSSL_DEBUG
printf ("tls1_setup_key_block()\n");
#endif /* KSSL_DEBUG */
if (s->s3->tmp.key_block_length != 0)
return(1);
if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
{
SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
return(0);
}
s->s3->tmp.new_sym_enc=c;
s->s3->tmp.new_hash=hash;
num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
num*=2;
ssl3_cleanup_key_block(s);
if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
goto err;
if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
goto err;
s->s3->tmp.key_block_length=num;
s->s3->tmp.key_block=p1;
#ifdef TLS_DEBUG
printf("client random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
printf("server random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
printf("pre-master\n");
{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
#endif
tls1_generate_key_block(s,p1,p2,num);
OPENSSL_cleanse(p2,num);
OPENSSL_free(p2);
#ifdef TLS_DEBUG
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);
return(0);
}
int tls1_enc(SSL *s, int send)
{
SSL3_RECORD *rec;
EVP_CIPHER_CTX *ds;
unsigned long l;
int bs,i,ii,j,k,n=0;
const EVP_CIPHER *enc;
if (send)
{
if (s->write_hash != NULL)
n=EVP_MD_size(s->write_hash);
ds=s->enc_write_ctx;
rec= &(s->s3->wrec);
if (s->enc_write_ctx == NULL)
enc=NULL;
else
enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
}
else
{
if (s->read_hash != NULL)
n=EVP_MD_size(s->read_hash);
ds=s->enc_read_ctx;
rec= &(s->s3->rrec);
if (s->enc_read_ctx == NULL)
enc=NULL;
else
enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
}
#ifdef KSSL_DEBUG
printf("tls1_enc(%d)\n", send);
#endif /* KSSL_DEBUG */
if ((s->session == NULL) || (ds == NULL) ||
(enc == NULL))
{
memmove(rec->data,rec->input,rec->length);
rec->input=rec->data;
}
else
{
l=rec->length;
bs=EVP_CIPHER_block_size(ds->cipher);
if ((bs != 1) && send)
{
i=bs-((int)l%bs);
/* Add weird padding of upto 256 bytes */
/* we need to add 'i' padding bytes of value j */
j=i-1;
if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
{
if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
j++;
}
for (k=(int)l; k<(int)(l+i); k++)
rec->input[k]=j;
l+=i;
rec->length+=i;
}
#ifdef KSSL_DEBUG
{
unsigned long ui;
printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
ds,rec->data,rec->input,l);
printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
ds->buf_len, ds->cipher->key_len,
DES_KEY_SZ, DES_SCHEDULE_SZ,
ds->cipher->iv_len);
printf("\t\tIV: ");
for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
printf("\n");
printf("\trec->input=");
for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
printf("\n");
}
#endif /* KSSL_DEBUG */
if (!send)
{
if (l == 0 || l%bs != 0)
{
SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
return 0;
}
}
EVP_Cipher(ds,rec->data,rec->input,l);
#ifdef KSSL_DEBUG
{
unsigned long i;
printf("\trec->data=");
for (i=0; i<l; i++)
printf(" %02x", rec->data[i]); printf("\n");
}
#endif /* KSSL_DEBUG */
if ((bs != 1) && !send)
{
ii=i=rec->data[l-1]; /* padding_length */
i++;
/* NB: if compression is in operation the first packet
* may not be of even length so the padding bug check
* cannot be performed. This bug workaround has been
* around since SSLeay so hopefully it is either fixed
* now or no buggy implementation supports compression
* [steve]
*/
if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
&& !s->expand)
{
/* First packet is even in size, so check */
if ((memcmp(s->s3->read_sequence,
"\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
i--;
}
/* TLS 1.0 does not bound the number of padding bytes by the block size.
* All of them must have value 'padding_length'. */
if (i > (int)rec->length)
{
/* Incorrect padding. SSLerr() and ssl3_alert are done
* by caller: we don't want to reveal whether this is
* a decryption error or a MAC verification failure
* (see http://www.openssl.org/~bodo/tls-cbc.txt) */
return -1;
}
for (j=(int)(l-i); j<(int)l; j++)
{
if (rec->data[j] != ii)
{
/* Incorrect padding */
return -1;
}
}
rec->length-=i;
}
}
return(1);
}
int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
{
unsigned int ret;
EVP_MD_CTX ctx;
EVP_MD_CTX_init(&ctx);
EVP_MD_CTX_copy_ex(&ctx,in_ctx);
EVP_DigestFinal_ex(&ctx,out,&ret);
EVP_MD_CTX_cleanup(&ctx);
return((int)ret);
}
int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
const char *str, int slen, unsigned char *out)
{
unsigned int i;
EVP_MD_CTX ctx;
unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
unsigned char *q,buf2[12];
q=buf;
memcpy(q,str,slen);
q+=slen;
EVP_MD_CTX_init(&ctx);
EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
EVP_DigestFinal_ex(&ctx,q,&i);
q+=i;
EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
EVP_DigestFinal_ex(&ctx,q,&i);
q+=i;
tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
s->session->master_key,s->session->master_key_length,
out,buf2,sizeof buf2);
EVP_MD_CTX_cleanup(&ctx);
return sizeof buf2;
}
int tls1_mac(SSL *ssl, unsigned char *md, int send)
{
SSL3_RECORD *rec;
unsigned char *mac_sec,*seq;
const EVP_MD *hash;
unsigned int md_size;
int i;
HMAC_CTX hmac;
unsigned char buf[5];
if (send)
{
rec= &(ssl->s3->wrec);
mac_sec= &(ssl->s3->write_mac_secret[0]);
seq= &(ssl->s3->write_sequence[0]);
hash=ssl->write_hash;
}
else
{
rec= &(ssl->s3->rrec);
mac_sec= &(ssl->s3->read_mac_secret[0]);
seq= &(ssl->s3->read_sequence[0]);
hash=ssl->read_hash;
}
md_size=EVP_MD_size(hash);
buf[0]=rec->type;
buf[1]=TLS1_VERSION_MAJOR;
buf[2]=TLS1_VERSION_MINOR;
buf[3]=rec->length>>8;
buf[4]=rec->length&0xff;
/* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
HMAC_CTX_init(&hmac);
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);
HMAC_Final(&hmac,md,&md_size);
HMAC_CTX_cleanup(&hmac);
#ifdef TLS_DEBUG
printf("sec=");
{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
printf("seq=");
{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
printf("buf=");
{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
printf("rec=");
{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
#endif
if ( SSL_version(ssl) != DTLS1_VERSION)
{
for (i=7; i>=0; i--)
{
++seq[i];
if (seq[i] != 0) break;
}
}
#ifdef TLS_DEBUG
{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
#endif
return(md_size);
}
int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
int len)
{
unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
#ifdef KSSL_DEBUG
printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
#endif /* KSSL_DEBUG */
/* Setup the stuff to munge */
memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
TLS_MD_MASTER_SECRET_CONST_SIZE);
memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
s->s3->client_random,SSL3_RANDOM_SIZE);
memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
s->s3->server_random,SSL3_RANDOM_SIZE);
tls1_PRF(s->ctx->md5,s->ctx->sha1,
buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
s->session->master_key,buff,sizeof buff);
#ifdef KSSL_DEBUG
printf ("tls1_generate_master_secret() complete\n");
#endif /* KSSL_DEBUG */
return(SSL3_MASTER_SECRET_SIZE);
}
int tls1_alert_code(int code)
{
switch (code)
{
case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED);
case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW);
case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
case SSL_AD_NO_CERTIFICATE: return(-1);
case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA);
case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED);
case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR);
case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR);
case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION);
case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR);
case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED);
case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION);
case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
(DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
default: return(-1);
}
}
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