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.]
61 #include <openssl/md5.h>
62 #include <openssl/sha.h>
63 #include <openssl/evp.h>
66 static unsigned char ssl3_pad_1[48]={
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,
71 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
72 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
74 static unsigned char ssl3_pad_2[48]={
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,
79 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
80 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
82 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
83 const char *sender, int len, unsigned char *p);
85 static void ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
89 unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
94 c = os_toascii[c]; /*'A' in ASCII */
97 for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
100 /* If this assert is triggered, it means buf needs to be
101 resized. This should never be triggered in a release. */
102 assert(k <= sizeof(buf));
107 SHA1_Update(&s1,buf,k);
108 SHA1_Update(&s1,s->session->master_key,
109 s->session->master_key_length);
110 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
111 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
112 SHA1_Final( smd,&s1);
115 MD5_Update(&m5,s->session->master_key,
116 s->session->master_key_length);
117 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
118 if ((i+MD5_DIGEST_LENGTH) > num)
121 memcpy(km,smd,(num-i));
126 km+=MD5_DIGEST_LENGTH;
128 memset(smd,0,SHA_DIGEST_LENGTH);
131 int ssl3_change_cipher_state(SSL *s, int which)
133 unsigned char *p,*key_block,*mac_secret;
134 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
135 unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
136 unsigned char *ms,*key,*iv,*er1,*er2;
144 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
145 c=s->s3->tmp.new_sym_enc;
146 m=s->s3->tmp.new_hash;
147 if (s->s3->tmp.new_compression == NULL)
150 comp=s->s3->tmp.new_compression->method;
151 key_block=s->s3->tmp.key_block;
153 if (which & SSL3_CC_READ)
155 if ((s->enc_read_ctx == NULL) &&
156 ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
157 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
162 if (s->expand != NULL)
164 COMP_CTX_free(s->expand);
169 s->expand=COMP_CTX_new(comp);
170 if (s->expand == NULL)
172 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
175 if (s->s3->rrec.comp == NULL)
176 s->s3->rrec.comp=(unsigned char *)
177 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
178 if (s->s3->rrec.comp == NULL)
181 memset(&(s->s3->read_sequence[0]),0,8);
182 mac_secret= &(s->s3->read_mac_secret[0]);
186 if ((s->enc_write_ctx == NULL) &&
187 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
188 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
190 dd= s->enc_write_ctx;
193 if (s->compress != NULL)
195 COMP_CTX_free(s->compress);
200 s->compress=COMP_CTX_new(comp);
201 if (s->compress == NULL)
203 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
207 memset(&(s->s3->write_sequence[0]),0,8);
208 mac_secret= &(s->s3->write_mac_secret[0]);
211 EVP_CIPHER_CTX_init(dd);
213 p=s->s3->tmp.key_block;
215 cl=EVP_CIPHER_key_length(c);
216 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
217 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
218 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
219 k=EVP_CIPHER_iv_length(c);
220 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
221 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
224 key= &(p[ n]); n+=j+j;
225 iv= &(p[ n]); n+=k+k;
226 er1= &(s->s3->client_random[0]);
227 er2= &(s->s3->server_random[0]);
232 ms= &(p[ n]); n+=i+j;
233 key= &(p[ n]); n+=j+k;
235 er1= &(s->s3->server_random[0]);
236 er2= &(s->s3->client_random[0]);
239 if (n > s->s3->tmp.key_block_length)
241 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
245 memcpy(mac_secret,ms,i);
248 /* In here I set both the read and write key/iv to the
249 * same value since only the correct one will be used :-).
252 MD5_Update(&md,key,j);
253 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
254 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
255 MD5_Final(&(exp_key[0]),&md);
261 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
262 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
263 MD5_Final(&(exp_iv[0]),&md);
268 s->session->key_arg_length=0;
270 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
272 memset(&(exp_key[0]),0,sizeof(exp_key));
273 memset(&(exp_iv[0]),0,sizeof(exp_iv));
276 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
281 int ssl3_setup_key_block(SSL *s)
289 if (s->s3->tmp.key_block_length != 0)
292 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
294 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
298 s->s3->tmp.new_sym_enc=c;
299 s->s3->tmp.new_hash=hash;
300 s->s3->tmp.new_compression=comp;
302 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
305 ssl3_cleanup_key_block(s);
307 if ((p=OPENSSL_malloc(num)) == NULL)
310 s->s3->tmp.key_block_length=num;
311 s->s3->tmp.key_block=p;
313 ssl3_generate_key_block(s,p,num);
317 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
321 void ssl3_cleanup_key_block(SSL *s)
323 if (s->s3->tmp.key_block != NULL)
325 memset(s->s3->tmp.key_block,0,
326 s->s3->tmp.key_block_length);
327 OPENSSL_free(s->s3->tmp.key_block);
328 s->s3->tmp.key_block=NULL;
330 s->s3->tmp.key_block_length=0;
333 int ssl3_enc(SSL *s, int send)
339 const EVP_CIPHER *enc;
345 if (s->enc_write_ctx == NULL)
348 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
354 if (s->enc_read_ctx == NULL)
357 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
360 if ((s->session == NULL) || (ds == NULL) ||
363 memcpy(rec->data,rec->input,rec->length);
364 rec->input=rec->data;
369 bs=EVP_CIPHER_block_size(ds->cipher);
373 /* This should be using (bs-1) and bs instead of 7 and 8 */
374 if ((bs != 1) && send)
378 /* we need to add 'i-1' padding bytes */
381 rec->input[l-1]=(i-1);
384 EVP_Cipher(ds,rec->data,rec->input,l);
386 if ((bs != 1) && !send)
391 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
392 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
401 void ssl3_init_finished_mac(SSL *s)
403 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
404 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
407 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
409 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
410 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
413 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
415 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
418 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
419 const char *sender, int len, unsigned char *p)
423 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
425 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
429 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
430 const char *sender, int len, unsigned char *p)
435 unsigned char md_buf[EVP_MAX_MD_SIZE];
438 EVP_MD_CTX_copy(&ctx,in_ctx);
440 n=EVP_MD_CTX_size(&ctx);
444 EVP_DigestUpdate(&ctx,sender,len);
445 EVP_DigestUpdate(&ctx,s->session->master_key,
446 s->session->master_key_length);
447 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
448 EVP_DigestFinal(&ctx,md_buf,&i);
450 EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
451 EVP_DigestUpdate(&ctx,s->session->master_key,
452 s->session->master_key_length);
453 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
454 EVP_DigestUpdate(&ctx,md_buf,i);
455 EVP_DigestFinal(&ctx,p,&ret);
457 memset(&ctx,0,sizeof(EVP_MD_CTX));
462 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
465 unsigned char *mac_sec,*seq;
468 unsigned char *p,rec_char;
469 unsigned int md_size;
474 rec= &(ssl->s3->wrec);
475 mac_sec= &(ssl->s3->write_mac_secret[0]);
476 seq= &(ssl->s3->write_sequence[0]);
477 hash=ssl->write_hash;
481 rec= &(ssl->s3->rrec);
482 mac_sec= &(ssl->s3->read_mac_secret[0]);
483 seq= &(ssl->s3->read_sequence[0]);
487 md_size=EVP_MD_size(hash);
488 npad=(48/md_size)*md_size;
490 /* Chop the digest off the end :-) */
492 EVP_DigestInit( &md_ctx,hash);
493 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
494 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
495 EVP_DigestUpdate(&md_ctx,seq,8);
497 EVP_DigestUpdate(&md_ctx,&rec_char,1);
500 EVP_DigestUpdate(&md_ctx,md,2);
501 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
502 EVP_DigestFinal( &md_ctx,md,NULL);
504 EVP_DigestInit( &md_ctx,hash);
505 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
506 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
507 EVP_DigestUpdate(&md_ctx,md,md_size);
508 EVP_DigestFinal( &md_ctx,md,&md_size);
513 if (seq[i] != 0) break;
519 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
522 static const unsigned char *salt[3]={
523 #ifndef CHARSET_EBCDIC
524 (const unsigned char *)"A",
525 (const unsigned char *)"BB",
526 (const unsigned char *)"CCC",
528 (const unsigned char *)"\x41",
529 (const unsigned char *)"\x42\x42",
530 (const unsigned char *)"\x43\x43\x43",
533 unsigned char buf[EVP_MAX_MD_SIZE];
540 EVP_DigestInit(&ctx,s->ctx->sha1);
541 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
542 EVP_DigestUpdate(&ctx,p,len);
543 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
545 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
547 EVP_DigestFinal(&ctx,buf,&n);
549 EVP_DigestInit(&ctx,s->ctx->md5);
550 EVP_DigestUpdate(&ctx,p,len);
551 EVP_DigestUpdate(&ctx,buf,n);
552 EVP_DigestFinal(&ctx,out,&n);
559 int ssl3_alert_code(int code)
563 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
564 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
565 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
566 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
567 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
568 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
569 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
570 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
571 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
572 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
573 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
574 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
575 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
576 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
577 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
578 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
579 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
580 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
581 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
582 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
583 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
584 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
585 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
586 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */