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.]
63 static unsigned char ssl3_pad_1[48]={
64 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
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 };
71 static unsigned char ssl3_pad_2[48]={
72 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
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 };
80 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
81 unsigned char *sender, int len, unsigned char *p);
83 static int ssl3_handshake_mac();
86 static void ssl3_generate_key_block(s,km,num)
93 unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
98 for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
105 SHA1_Update(&s1,buf,k);
106 SHA1_Update(&s1,s->session->master_key,
107 s->session->master_key_length);
108 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
109 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
110 SHA1_Final( smd,&s1);
113 MD5_Update(&m5,s->session->master_key,
114 s->session->master_key_length);
115 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
116 if ((i+MD5_DIGEST_LENGTH) > num)
119 memcpy(km,smd,(num-i));
124 km+=MD5_DIGEST_LENGTH;
126 memset(smd,0,SHA_DIGEST_LENGTH);
129 int ssl3_change_cipher_state(s,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=(s->s3->tmp.new_cipher->algorithms & SSL_EXPORT)?1:0;
145 c=s->s3->tmp.new_sym_enc;
146 m=s->s3->tmp.new_hash;
147 comp=s->s3->tmp.new_compression;
148 key_block=s->s3->tmp.key_block;
150 if (which & SSL3_CC_READ)
152 if ((s->enc_read_ctx == NULL) &&
153 ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
154 Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
159 if (s->expand != NULL)
161 COMP_CTX_free(s->expand);
166 s->expand=COMP_CTX_new(comp);
167 if (s->expand == NULL)
169 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
172 s->s3->rrec.comp=(unsigned char *)
173 Malloc(SSL3_RT_MAX_PLAIN_LENGTH);
174 if (s->s3->rrec.comp == NULL)
177 memset(&(s->s3->read_sequence[0]),0,8);
178 mac_secret= &(s->s3->read_mac_secret[0]);
182 if ((s->enc_write_ctx == NULL) &&
183 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
184 Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
186 dd= s->enc_write_ctx;
189 if (s->compress != NULL)
191 COMP_CTX_free(s->compress);
196 s->compress=COMP_CTX_new(comp);
197 if (s->compress == NULL)
199 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
203 memset(&(s->s3->write_sequence[0]),0,8);
204 mac_secret= &(s->s3->write_mac_secret[0]);
207 EVP_CIPHER_CTX_init(dd);
209 p=s->s3->tmp.key_block;
211 cl=EVP_CIPHER_key_length(c);
212 j=exp ? (cl < 5 ? cl : 5) : cl;
213 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
214 k=EVP_CIPHER_iv_length(c);
215 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
216 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
219 key= &(p[ n]); n+=j+j;
220 iv= &(p[ n]); n+=k+k;
221 er1= &(s->s3->client_random[0]);
222 er2= &(s->s3->server_random[0]);
227 ms= &(p[ n]); n+=i+j;
228 key= &(p[ n]); n+=j+k;
230 er1= &(s->s3->server_random[0]);
231 er2= &(s->s3->client_random[0]);
234 if (n > s->s3->tmp.key_block_length)
236 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
240 memcpy(mac_secret,ms,i);
243 /* In here I set both the read and write key/iv to the
244 * same value since only the correct one will be used :-).
247 MD5_Update(&md,key,j);
248 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
249 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
250 MD5_Final(&(exp_key[0]),&md);
256 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
257 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
258 MD5_Final(&(exp_iv[0]),&md);
263 s->session->key_arg_length=0;
265 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
267 memset(&(exp_key[0]),0,sizeof(exp_key));
268 memset(&(exp_iv[0]),0,sizeof(exp_iv));
271 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
276 int ssl3_setup_key_block(s)
284 if (s->s3->tmp.key_block_length != 0)
287 if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
289 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
293 s->s3->tmp.new_sym_enc=c;
294 s->s3->tmp.new_hash=hash;
296 s->s3->tmp.new_compression=COMP_zlib();
298 /* s->s3->tmp.new_compression=COMP_rle(); */
299 /* s->session->compress_meth= xxxxx */
301 exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
303 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
306 ssl3_cleanup_key_block(s);
308 if ((p=(unsigned char *)Malloc(num)) == NULL)
311 s->s3->tmp.key_block_length=num;
312 s->s3->tmp.key_block=p;
314 ssl3_generate_key_block(s,p,num);
318 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
322 void ssl3_cleanup_key_block(s)
325 if (s->s3->tmp.key_block != NULL)
327 memset(s->s3->tmp.key_block,0,
328 s->s3->tmp.key_block_length);
329 Free(s->s3->tmp.key_block);
330 s->s3->tmp.key_block=NULL;
332 s->s3->tmp.key_block_length=0;
349 if (s->enc_write_ctx == NULL)
352 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
358 if (s->enc_read_ctx == NULL)
361 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
364 if ((s->session == NULL) || (ds == NULL) ||
367 memcpy(rec->data,rec->input,rec->length);
368 rec->input=rec->data;
373 bs=EVP_CIPHER_block_size(ds->cipher);
377 /* This should be using (bs-1) and bs instead of 7 and 8 */
378 if ((bs != 1) && send)
382 /* we need to add 'i-1' padding bytes */
385 rec->input[l-1]=(i-1);
388 EVP_Cipher(ds,rec->data,rec->input,l);
390 if ((bs != 1) && !send)
395 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
396 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
405 void ssl3_init_finished_mac(s)
408 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
409 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
412 void ssl3_finish_mac(s,buf,len)
417 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
418 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
421 int ssl3_cert_verify_mac(s,ctx,p)
426 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
429 int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
431 EVP_MD_CTX *ctx1,*ctx2;
432 unsigned char *sender;
438 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
440 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
444 static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
447 unsigned char *sender;
454 unsigned char md_buf[EVP_MAX_MD_SIZE];
457 memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));
459 n=EVP_MD_CTX_size(&ctx);
463 EVP_DigestUpdate(&ctx,sender,len);
464 EVP_DigestUpdate(&ctx,s->session->master_key,
465 s->session->master_key_length);
466 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
467 EVP_DigestFinal(&ctx,md_buf,&i);
469 EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
470 EVP_DigestUpdate(&ctx,s->session->master_key,
471 s->session->master_key_length);
472 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
473 EVP_DigestUpdate(&ctx,md_buf,i);
474 EVP_DigestFinal(&ctx,p,&ret);
476 memset(&ctx,0,sizeof(EVP_MD_CTX));
481 int ssl3_mac(ssl,md,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 :-) */
514 EVP_DigestInit( &md_ctx,hash);
515 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
516 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
517 EVP_DigestUpdate(&md_ctx,seq,8);
519 EVP_DigestUpdate(&md_ctx,&rec_char,1);
522 EVP_DigestUpdate(&md_ctx,md,2);
523 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
524 EVP_DigestFinal( &md_ctx,md,NULL);
526 EVP_DigestInit( &md_ctx,hash);
527 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
528 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
529 EVP_DigestUpdate(&md_ctx,md,md_size);
530 EVP_DigestFinal( &md_ctx,md,&md_size);
538 int ssl3_generate_master_secret(s,out,p,len)
544 static unsigned char *salt[3]={
545 (unsigned char *)"A",
546 (unsigned char *)"BB",
547 (unsigned char *)"CCC",
549 unsigned char buf[EVP_MAX_MD_SIZE];
556 EVP_DigestInit(&ctx,s->ctx->sha1);
557 EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
558 EVP_DigestUpdate(&ctx,p,len);
559 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
561 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
563 EVP_DigestFinal(&ctx,buf,&n);
565 EVP_DigestInit(&ctx,s->ctx->md5);
566 EVP_DigestUpdate(&ctx,p,len);
567 EVP_DigestUpdate(&ctx,buf,n);
568 EVP_DigestFinal(&ctx,out,&n);
575 int ssl3_alert_code(code)
580 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
581 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
582 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
583 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
584 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
585 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
586 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
587 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
588 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
589 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
590 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
591 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
592 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
593 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
594 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
595 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
596 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
597 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
598 case SSL_AD_EXPORT_RESTRICION: return(SSL3_AD_HANDSHAKE_FAILURE);
599 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
600 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
601 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
602 case SSL_AD_USER_CANCLED: return(SSL3_AD_HANDSHAKE_FAILURE);
603 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */