2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
60 #include <openssl/evp.h>
62 #include <openssl/md5.h>
64 static unsigned char ssl3_pad_1
[48]={
65 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
66 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
67 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
68 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
69 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
70 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
72 static unsigned char ssl3_pad_2
[48]={
73 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
74 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
75 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
76 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
77 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
78 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
80 static int ssl3_handshake_mac(SSL
*s
, EVP_MD_CTX
*in_ctx
,
81 const char *sender
, int len
, unsigned char *p
);
83 static int ssl3_generate_key_block(SSL
*s
, unsigned char *km
, int num
)
87 unsigned char buf
[16],smd
[SHA_DIGEST_LENGTH
];
92 c
= os_toascii
[c
]; /*'A' in ASCII */
97 for (i
=0; i
<num
; i
+=MD5_DIGEST_LENGTH
)
102 /* bug: 'buf' is too small for this ciphersuite */
103 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK
, ERR_R_INTERNAL_ERROR
);
110 EVP_DigestInit(&s1
,EVP_sha1());
111 EVP_DigestUpdate(&s1
,buf
,k
);
112 EVP_DigestUpdate(&s1
,s
->session
->master_key
,
113 s
->session
->master_key_length
);
114 EVP_DigestUpdate(&s1
,s
->s3
->server_random
,SSL3_RANDOM_SIZE
);
115 EVP_DigestUpdate(&s1
,s
->s3
->client_random
,SSL3_RANDOM_SIZE
);
116 EVP_DigestFinal(&s1
,smd
,NULL
);
118 EVP_DigestInit(&m5
,EVP_md5());
119 EVP_DigestUpdate(&m5
,s
->session
->master_key
,
120 s
->session
->master_key_length
);
121 EVP_DigestUpdate(&m5
,smd
,SHA_DIGEST_LENGTH
);
122 if ((i
+MD5_DIGEST_LENGTH
) > num
)
124 EVP_DigestFinal(&m5
,smd
,NULL
);
125 memcpy(km
,smd
,(num
-i
));
128 EVP_DigestFinal(&m5
,km
,NULL
);
130 km
+=MD5_DIGEST_LENGTH
;
132 memset(smd
,0,SHA_DIGEST_LENGTH
);
133 EVP_MD_CTX_cleanup(&m5
);
134 EVP_MD_CTX_cleanup(&s1
);
138 int ssl3_change_cipher_state(SSL
*s
, int which
)
140 unsigned char *p
,*key_block
,*mac_secret
;
141 unsigned char exp_key
[EVP_MAX_KEY_LENGTH
];
142 unsigned char exp_iv
[EVP_MAX_KEY_LENGTH
];
143 unsigned char *ms
,*key
,*iv
,*er1
,*er2
;
151 exp
=SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
);
152 c
=s
->s3
->tmp
.new_sym_enc
;
153 m
=s
->s3
->tmp
.new_hash
;
154 if (s
->s3
->tmp
.new_compression
== NULL
)
157 comp
=s
->s3
->tmp
.new_compression
->method
;
158 key_block
=s
->s3
->tmp
.key_block
;
160 if (which
& SSL3_CC_READ
)
162 if ((s
->enc_read_ctx
== NULL
) &&
163 ((s
->enc_read_ctx
=(EVP_CIPHER_CTX
*)
164 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX
))) == NULL
))
169 if (s
->expand
!= NULL
)
171 COMP_CTX_free(s
->expand
);
176 s
->expand
=COMP_CTX_new(comp
);
177 if (s
->expand
== NULL
)
179 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,SSL_R_COMPRESSION_LIBRARY_ERROR
);
182 if (s
->s3
->rrec
.comp
== NULL
)
183 s
->s3
->rrec
.comp
=(unsigned char *)
184 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH
);
185 if (s
->s3
->rrec
.comp
== NULL
)
188 memset(&(s
->s3
->read_sequence
[0]),0,8);
189 mac_secret
= &(s
->s3
->read_mac_secret
[0]);
193 if ((s
->enc_write_ctx
== NULL
) &&
194 ((s
->enc_write_ctx
=(EVP_CIPHER_CTX
*)
195 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX
))) == NULL
))
197 dd
= s
->enc_write_ctx
;
200 if (s
->compress
!= NULL
)
202 COMP_CTX_free(s
->compress
);
207 s
->compress
=COMP_CTX_new(comp
);
208 if (s
->compress
== NULL
)
210 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,SSL_R_COMPRESSION_LIBRARY_ERROR
);
214 memset(&(s
->s3
->write_sequence
[0]),0,8);
215 mac_secret
= &(s
->s3
->write_mac_secret
[0]);
218 EVP_CIPHER_CTX_init(dd
);
220 p
=s
->s3
->tmp
.key_block
;
222 cl
=EVP_CIPHER_key_length(c
);
223 j
=exp
? (cl
< SSL_C_EXPORT_KEYLENGTH(s
->s3
->tmp
.new_cipher
) ?
224 cl
: SSL_C_EXPORT_KEYLENGTH(s
->s3
->tmp
.new_cipher
)) : cl
;
225 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
226 k
=EVP_CIPHER_iv_length(c
);
227 if ( (which
== SSL3_CHANGE_CIPHER_CLIENT_WRITE
) ||
228 (which
== SSL3_CHANGE_CIPHER_SERVER_READ
))
231 key
= &(p
[ n
]); n
+=j
+j
;
232 iv
= &(p
[ n
]); n
+=k
+k
;
233 er1
= &(s
->s3
->client_random
[0]);
234 er2
= &(s
->s3
->server_random
[0]);
239 ms
= &(p
[ n
]); n
+=i
+j
;
240 key
= &(p
[ n
]); n
+=j
+k
;
242 er1
= &(s
->s3
->server_random
[0]);
243 er2
= &(s
->s3
->client_random
[0]);
246 if (n
> s
->s3
->tmp
.key_block_length
)
248 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,ERR_R_INTERNAL_ERROR
);
252 EVP_MD_CTX_init(&md
);
253 memcpy(mac_secret
,ms
,i
);
256 /* In here I set both the read and write key/iv to the
257 * same value since only the correct one will be used :-).
259 EVP_DigestInit(&md
,EVP_md5());
260 EVP_DigestUpdate(&md
,key
,j
);
261 EVP_DigestUpdate(&md
,er1
,SSL3_RANDOM_SIZE
);
262 EVP_DigestUpdate(&md
,er2
,SSL3_RANDOM_SIZE
);
263 EVP_DigestFinal(&md
,&(exp_key
[0]),NULL
);
268 EVP_DigestInit(&md
,EVP_md5());
269 EVP_DigestUpdate(&md
,er1
,SSL3_RANDOM_SIZE
);
270 EVP_DigestUpdate(&md
,er2
,SSL3_RANDOM_SIZE
);
271 EVP_DigestFinal(&md
,&(exp_iv
[0]),NULL
);
276 s
->session
->key_arg_length
=0;
278 EVP_CipherInit(dd
,c
,key
,iv
,(which
& SSL3_CC_WRITE
));
280 memset(&(exp_key
[0]),0,sizeof(exp_key
));
281 memset(&(exp_iv
[0]),0,sizeof(exp_iv
));
282 EVP_MD_CTX_cleanup(&md
);
285 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,ERR_R_MALLOC_FAILURE
);
290 int ssl3_setup_key_block(SSL
*s
)
298 if (s
->s3
->tmp
.key_block_length
!= 0)
301 if (!ssl_cipher_get_evp(s
->session
,&c
,&hash
,&comp
))
303 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK
,SSL_R_CIPHER_OR_HASH_UNAVAILABLE
);
307 s
->s3
->tmp
.new_sym_enc
=c
;
308 s
->s3
->tmp
.new_hash
=hash
;
309 s
->s3
->tmp
.new_compression
=comp
;
311 num
=EVP_CIPHER_key_length(c
)+EVP_MD_size(hash
)+EVP_CIPHER_iv_length(c
);
314 ssl3_cleanup_key_block(s
);
316 if ((p
=OPENSSL_malloc(num
)) == NULL
)
319 s
->s3
->tmp
.key_block_length
=num
;
320 s
->s3
->tmp
.key_block
=p
;
322 return ssl3_generate_key_block(s
,p
,num
);
325 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK
,ERR_R_MALLOC_FAILURE
);
329 void ssl3_cleanup_key_block(SSL
*s
)
331 if (s
->s3
->tmp
.key_block
!= NULL
)
333 memset(s
->s3
->tmp
.key_block
,0,
334 s
->s3
->tmp
.key_block_length
);
335 OPENSSL_free(s
->s3
->tmp
.key_block
);
336 s
->s3
->tmp
.key_block
=NULL
;
338 s
->s3
->tmp
.key_block_length
=0;
341 int ssl3_enc(SSL
*s
, int send
)
347 const EVP_CIPHER
*enc
;
353 if (s
->enc_write_ctx
== NULL
)
356 enc
=EVP_CIPHER_CTX_cipher(s
->enc_write_ctx
);
362 if (s
->enc_read_ctx
== NULL
)
365 enc
=EVP_CIPHER_CTX_cipher(s
->enc_read_ctx
);
368 if ((s
->session
== NULL
) || (ds
== NULL
) ||
371 memmove(rec
->data
,rec
->input
,rec
->length
);
372 rec
->input
=rec
->data
;
377 bs
=EVP_CIPHER_block_size(ds
->cipher
);
381 if ((bs
!= 1) && send
)
385 /* we need to add 'i-1' padding bytes */
388 rec
->input
[l
-1]=(i
-1);
393 if (l
== 0 || l
%bs
!= 0)
395 SSLerr(SSL_F_SSL3_ENC
,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG
);
396 ssl3_send_alert(s
,SSL3_AL_FATAL
,SSL_AD_DECRYPTION_FAILED
);
401 EVP_Cipher(ds
,rec
->data
,rec
->input
,l
);
403 if ((bs
!= 1) && !send
)
406 /* SSL 3.0 bounds the number of padding bytes by the block size;
407 * padding bytes (except that last) are arbitrary */
410 /* Incorrect padding. SSLerr() and ssl3_alert are done
411 * by caller: we don't want to reveal whether this is
412 * a decryption error or a MAC verification failure
413 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
422 void ssl3_init_finished_mac(SSL
*s
)
424 EVP_DigestInit(&(s
->s3
->finish_dgst1
),s
->ctx
->md5
);
425 EVP_DigestInit(&(s
->s3
->finish_dgst2
),s
->ctx
->sha1
);
428 void ssl3_finish_mac(SSL
*s
, const unsigned char *buf
, int len
)
430 EVP_DigestUpdate(&(s
->s3
->finish_dgst1
),buf
,len
);
431 EVP_DigestUpdate(&(s
->s3
->finish_dgst2
),buf
,len
);
434 int ssl3_cert_verify_mac(SSL
*s
, EVP_MD_CTX
*ctx
, unsigned char *p
)
436 return(ssl3_handshake_mac(s
,ctx
,NULL
,0,p
));
439 int ssl3_final_finish_mac(SSL
*s
, EVP_MD_CTX
*ctx1
, EVP_MD_CTX
*ctx2
,
440 const char *sender
, int len
, unsigned char *p
)
444 ret
=ssl3_handshake_mac(s
,ctx1
,sender
,len
,p
);
446 ret
+=ssl3_handshake_mac(s
,ctx2
,sender
,len
,p
);
450 static int ssl3_handshake_mac(SSL
*s
, EVP_MD_CTX
*in_ctx
,
451 const char *sender
, int len
, unsigned char *p
)
456 unsigned char md_buf
[EVP_MAX_MD_SIZE
];
459 EVP_MD_CTX_init(&ctx
);
460 EVP_MD_CTX_copy(&ctx
,in_ctx
);
462 n
=EVP_MD_CTX_size(&ctx
);
466 EVP_DigestUpdate(&ctx
,sender
,len
);
467 EVP_DigestUpdate(&ctx
,s
->session
->master_key
,
468 s
->session
->master_key_length
);
469 EVP_DigestUpdate(&ctx
,ssl3_pad_1
,npad
);
470 EVP_DigestFinal(&ctx
,md_buf
,&i
);
472 EVP_DigestInit(&ctx
,EVP_MD_CTX_md(&ctx
));
473 EVP_DigestUpdate(&ctx
,s
->session
->master_key
,
474 s
->session
->master_key_length
);
475 EVP_DigestUpdate(&ctx
,ssl3_pad_2
,npad
);
476 EVP_DigestUpdate(&ctx
,md_buf
,i
);
477 EVP_DigestFinal(&ctx
,p
,&ret
);
479 EVP_MD_CTX_cleanup(&ctx
);
484 int ssl3_mac(SSL
*ssl
, unsigned char *md
, int send
)
487 unsigned char *mac_sec
,*seq
;
490 unsigned char *p
,rec_char
;
491 unsigned int md_size
;
496 rec
= &(ssl
->s3
->wrec
);
497 mac_sec
= &(ssl
->s3
->write_mac_secret
[0]);
498 seq
= &(ssl
->s3
->write_sequence
[0]);
499 hash
=ssl
->write_hash
;
503 rec
= &(ssl
->s3
->rrec
);
504 mac_sec
= &(ssl
->s3
->read_mac_secret
[0]);
505 seq
= &(ssl
->s3
->read_sequence
[0]);
509 md_size
=EVP_MD_size(hash
);
510 npad
=(48/md_size
)*md_size
;
512 /* Chop the digest off the end :-) */
513 EVP_MD_CTX_init(&md_ctx
);
515 EVP_DigestInit( &md_ctx
,hash
);
516 EVP_DigestUpdate(&md_ctx
,mac_sec
,md_size
);
517 EVP_DigestUpdate(&md_ctx
,ssl3_pad_1
,npad
);
518 EVP_DigestUpdate(&md_ctx
,seq
,8);
520 EVP_DigestUpdate(&md_ctx
,&rec_char
,1);
523 EVP_DigestUpdate(&md_ctx
,md
,2);
524 EVP_DigestUpdate(&md_ctx
,rec
->input
,rec
->length
);
525 EVP_DigestFinal( &md_ctx
,md
,NULL
);
527 EVP_DigestInit( &md_ctx
,hash
);
528 EVP_DigestUpdate(&md_ctx
,mac_sec
,md_size
);
529 EVP_DigestUpdate(&md_ctx
,ssl3_pad_2
,npad
);
530 EVP_DigestUpdate(&md_ctx
,md
,md_size
);
531 EVP_DigestFinal( &md_ctx
,md
,&md_size
);
533 EVP_MD_CTX_cleanup(&md_ctx
);
538 if (seq
[i
] != 0) break;
544 int ssl3_generate_master_secret(SSL
*s
, unsigned char *out
, unsigned char *p
,
547 static const unsigned char *salt
[3]={
548 #ifndef CHARSET_EBCDIC
549 (const unsigned char *)"A",
550 (const unsigned char *)"BB",
551 (const unsigned char *)"CCC",
553 (const unsigned char *)"\x41",
554 (const unsigned char *)"\x42\x42",
555 (const unsigned char *)"\x43\x43\x43",
558 unsigned char buf
[EVP_MAX_MD_SIZE
];
563 EVP_MD_CTX_init(&ctx
);
566 EVP_DigestInit(&ctx
,s
->ctx
->sha1
);
567 EVP_DigestUpdate(&ctx
,salt
[i
],strlen((const char *)salt
[i
]));
568 EVP_DigestUpdate(&ctx
,p
,len
);
569 EVP_DigestUpdate(&ctx
,&(s
->s3
->client_random
[0]),
571 EVP_DigestUpdate(&ctx
,&(s
->s3
->server_random
[0]),
573 EVP_DigestFinal(&ctx
,buf
,&n
);
575 EVP_DigestInit(&ctx
,s
->ctx
->md5
);
576 EVP_DigestUpdate(&ctx
,p
,len
);
577 EVP_DigestUpdate(&ctx
,buf
,n
);
578 EVP_DigestFinal(&ctx
,out
,&n
);
582 EVP_MD_CTX_cleanup(&ctx
);
586 int ssl3_alert_code(int code
)
590 case SSL_AD_CLOSE_NOTIFY
: return(SSL3_AD_CLOSE_NOTIFY
);
591 case SSL_AD_UNEXPECTED_MESSAGE
: return(SSL3_AD_UNEXPECTED_MESSAGE
);
592 case SSL_AD_BAD_RECORD_MAC
: return(SSL3_AD_BAD_RECORD_MAC
);
593 case SSL_AD_DECRYPTION_FAILED
: return(SSL3_AD_BAD_RECORD_MAC
);
594 case SSL_AD_RECORD_OVERFLOW
: return(SSL3_AD_BAD_RECORD_MAC
);
595 case SSL_AD_DECOMPRESSION_FAILURE
:return(SSL3_AD_DECOMPRESSION_FAILURE
);
596 case SSL_AD_HANDSHAKE_FAILURE
: return(SSL3_AD_HANDSHAKE_FAILURE
);
597 case SSL_AD_NO_CERTIFICATE
: return(SSL3_AD_NO_CERTIFICATE
);
598 case SSL_AD_BAD_CERTIFICATE
: return(SSL3_AD_BAD_CERTIFICATE
);
599 case SSL_AD_UNSUPPORTED_CERTIFICATE
:return(SSL3_AD_UNSUPPORTED_CERTIFICATE
);
600 case SSL_AD_CERTIFICATE_REVOKED
:return(SSL3_AD_CERTIFICATE_REVOKED
);
601 case SSL_AD_CERTIFICATE_EXPIRED
:return(SSL3_AD_CERTIFICATE_EXPIRED
);
602 case SSL_AD_CERTIFICATE_UNKNOWN
:return(SSL3_AD_CERTIFICATE_UNKNOWN
);
603 case SSL_AD_ILLEGAL_PARAMETER
: return(SSL3_AD_ILLEGAL_PARAMETER
);
604 case SSL_AD_UNKNOWN_CA
: return(SSL3_AD_BAD_CERTIFICATE
);
605 case SSL_AD_ACCESS_DENIED
: return(SSL3_AD_HANDSHAKE_FAILURE
);
606 case SSL_AD_DECODE_ERROR
: return(SSL3_AD_HANDSHAKE_FAILURE
);
607 case SSL_AD_DECRYPT_ERROR
: return(SSL3_AD_HANDSHAKE_FAILURE
);
608 case SSL_AD_EXPORT_RESTRICTION
: return(SSL3_AD_HANDSHAKE_FAILURE
);
609 case SSL_AD_PROTOCOL_VERSION
: return(SSL3_AD_HANDSHAKE_FAILURE
);
610 case SSL_AD_INSUFFICIENT_SECURITY
:return(SSL3_AD_HANDSHAKE_FAILURE
);
611 case SSL_AD_INTERNAL_ERROR
: return(SSL3_AD_HANDSHAKE_FAILURE
);
612 case SSL_AD_USER_CANCELLED
: return(SSL3_AD_HANDSHAKE_FAILURE
);
613 case SSL_AD_NO_RENEGOTIATION
: return(-1); /* Don't send it :-) */