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/md5.h>
61 #include <openssl/sha.h>
62 #include <openssl/evp.h>
65 static unsigned char ssl3_pad_1[48]={
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,
71 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
73 static unsigned char ssl3_pad_2[48]={
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,
79 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
82 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
83 unsigned char *sender, int len, unsigned char *p);
85 static int ssl3_handshake_mac();
88 static void ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
92 unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
97 for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
104 SHA1_Update(&s1,buf,k);
105 SHA1_Update(&s1,s->session->master_key,
106 s->session->master_key_length);
107 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
108 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
109 SHA1_Final( smd,&s1);
112 MD5_Update(&m5,s->session->master_key,
113 s->session->master_key_length);
114 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
115 if ((i+MD5_DIGEST_LENGTH) > num)
118 memcpy(km,smd,(num-i));
123 km+=MD5_DIGEST_LENGTH;
125 memset(smd,0,SHA_DIGEST_LENGTH);
128 int ssl3_change_cipher_state(SSL *s, int which)
130 unsigned char *p,*key_block,*mac_secret;
131 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
132 unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
133 unsigned char *ms,*key,*iv,*er1,*er2;
141 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
142 c=s->s3->tmp.new_sym_enc;
143 m=s->s3->tmp.new_hash;
144 if (s->s3->tmp.new_compression == NULL)
147 comp=s->s3->tmp.new_compression->method;
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 if (s->s3->rrec.comp == NULL)
173 s->s3->rrec.comp=(unsigned char *)
174 Malloc(SSL3_RT_MAX_PLAIN_LENGTH);
175 if (s->s3->rrec.comp == NULL)
178 memset(&(s->s3->read_sequence[0]),0,8);
179 mac_secret= &(s->s3->read_mac_secret[0]);
183 if ((s->enc_write_ctx == NULL) &&
184 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
185 Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
187 dd= s->enc_write_ctx;
190 if (s->compress != NULL)
192 COMP_CTX_free(s->compress);
197 s->compress=COMP_CTX_new(comp);
198 if (s->compress == NULL)
200 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
204 memset(&(s->s3->write_sequence[0]),0,8);
205 mac_secret= &(s->s3->write_mac_secret[0]);
208 EVP_CIPHER_CTX_init(dd);
210 p=s->s3->tmp.key_block;
212 cl=EVP_CIPHER_key_length(c);
213 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
214 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
215 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
216 k=EVP_CIPHER_iv_length(c);
217 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
218 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
221 key= &(p[ n]); n+=j+j;
222 iv= &(p[ n]); n+=k+k;
223 er1= &(s->s3->client_random[0]);
224 er2= &(s->s3->server_random[0]);
229 ms= &(p[ n]); n+=i+j;
230 key= &(p[ n]); n+=j+k;
232 er1= &(s->s3->server_random[0]);
233 er2= &(s->s3->client_random[0]);
236 if (n > s->s3->tmp.key_block_length)
238 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
242 memcpy(mac_secret,ms,i);
245 /* In here I set both the read and write key/iv to the
246 * same value since only the correct one will be used :-).
249 MD5_Update(&md,key,j);
250 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
251 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
252 MD5_Final(&(exp_key[0]),&md);
258 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
259 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
260 MD5_Final(&(exp_iv[0]),&md);
265 s->session->key_arg_length=0;
267 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
269 memset(&(exp_key[0]),0,sizeof(exp_key));
270 memset(&(exp_iv[0]),0,sizeof(exp_iv));
273 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
278 int ssl3_setup_key_block(SSL *s)
286 if (s->s3->tmp.key_block_length != 0)
289 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
291 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
295 s->s3->tmp.new_sym_enc=c;
296 s->s3->tmp.new_hash=hash;
297 s->s3->tmp.new_compression=comp;
299 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
302 ssl3_cleanup_key_block(s);
304 if ((p=(unsigned char *)Malloc(num)) == NULL)
307 s->s3->tmp.key_block_length=num;
308 s->s3->tmp.key_block=p;
310 ssl3_generate_key_block(s,p,num);
314 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
318 void ssl3_cleanup_key_block(SSL *s)
320 if (s->s3->tmp.key_block != NULL)
322 memset(s->s3->tmp.key_block,0,
323 s->s3->tmp.key_block_length);
324 Free(s->s3->tmp.key_block);
325 s->s3->tmp.key_block=NULL;
327 s->s3->tmp.key_block_length=0;
330 int ssl3_enc(SSL *s, int send)
336 const EVP_CIPHER *enc;
342 if (s->enc_write_ctx == NULL)
345 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
351 if (s->enc_read_ctx == NULL)
354 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
357 if ((s->session == NULL) || (ds == NULL) ||
360 memcpy(rec->data,rec->input,rec->length);
361 rec->input=rec->data;
366 bs=EVP_CIPHER_block_size(ds->cipher);
370 /* This should be using (bs-1) and bs instead of 7 and 8 */
371 if ((bs != 1) && send)
375 /* we need to add 'i-1' padding bytes */
378 rec->input[l-1]=(i-1);
381 EVP_Cipher(ds,rec->data,rec->input,l);
383 if ((bs != 1) && !send)
388 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
389 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
398 void ssl3_init_finished_mac(SSL *s)
400 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
401 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
404 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
406 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
407 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
410 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
412 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
415 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
416 unsigned char *sender, int len, unsigned char *p)
420 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
422 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
426 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
427 unsigned char *sender, int len, unsigned char *p)
432 unsigned char md_buf[EVP_MAX_MD_SIZE];
435 EVP_MD_CTX_copy(&ctx,in_ctx);
437 n=EVP_MD_CTX_size(&ctx);
441 EVP_DigestUpdate(&ctx,sender,len);
442 EVP_DigestUpdate(&ctx,s->session->master_key,
443 s->session->master_key_length);
444 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
445 EVP_DigestFinal(&ctx,md_buf,&i);
447 EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
448 EVP_DigestUpdate(&ctx,s->session->master_key,
449 s->session->master_key_length);
450 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
451 EVP_DigestUpdate(&ctx,md_buf,i);
452 EVP_DigestFinal(&ctx,p,&ret);
454 memset(&ctx,0,sizeof(EVP_MD_CTX));
459 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
462 unsigned char *mac_sec,*seq;
465 unsigned char *p,rec_char;
466 unsigned int md_size;
471 rec= &(ssl->s3->wrec);
472 mac_sec= &(ssl->s3->write_mac_secret[0]);
473 seq= &(ssl->s3->write_sequence[0]);
474 hash=ssl->write_hash;
478 rec= &(ssl->s3->rrec);
479 mac_sec= &(ssl->s3->read_mac_secret[0]);
480 seq= &(ssl->s3->read_sequence[0]);
484 md_size=EVP_MD_size(hash);
485 npad=(48/md_size)*md_size;
487 /* Chop the digest off the end :-) */
489 EVP_DigestInit( &md_ctx,hash);
490 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
491 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
492 EVP_DigestUpdate(&md_ctx,seq,8);
494 EVP_DigestUpdate(&md_ctx,&rec_char,1);
497 EVP_DigestUpdate(&md_ctx,md,2);
498 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
499 EVP_DigestFinal( &md_ctx,md,NULL);
501 EVP_DigestInit( &md_ctx,hash);
502 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
503 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
504 EVP_DigestUpdate(&md_ctx,md,md_size);
505 EVP_DigestFinal( &md_ctx,md,&md_size);
513 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
516 static const unsigned char *salt[3]={
517 (const unsigned char *)"A",
518 (const unsigned char *)"BB",
519 (const unsigned char *)"CCC",
521 unsigned char buf[EVP_MAX_MD_SIZE];
528 EVP_DigestInit(&ctx,s->ctx->sha1);
529 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
530 EVP_DigestUpdate(&ctx,p,len);
531 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
533 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
535 EVP_DigestFinal(&ctx,buf,&n);
537 EVP_DigestInit(&ctx,s->ctx->md5);
538 EVP_DigestUpdate(&ctx,p,len);
539 EVP_DigestUpdate(&ctx,buf,n);
540 EVP_DigestFinal(&ctx,out,&n);
547 int ssl3_alert_code(int code)
551 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
552 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
553 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
554 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
555 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
556 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
557 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
558 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
559 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
560 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
561 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
562 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
563 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
564 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
565 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
566 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
567 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
568 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
569 case SSL_AD_EXPORT_RESTRICION: return(SSL3_AD_HANDSHAKE_FAILURE);
570 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
571 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
572 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
573 case SSL_AD_USER_CANCLED: return(SSL3_AD_HANDSHAKE_FAILURE);
574 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */