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 };
81 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
82 const char *sender, int len, unsigned char *p);
84 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
88 unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
93 c = os_toascii[c]; /*'A' in ASCII */
96 for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
101 /* bug: 'buf' is too small for this ciphersuite */
102 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
110 SHA1_Update(&s1,buf,k);
111 SHA1_Update(&s1,s->session->master_key,
112 s->session->master_key_length);
113 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
114 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
115 SHA1_Final( smd,&s1);
118 MD5_Update(&m5,s->session->master_key,
119 s->session->master_key_length);
120 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
121 if ((i+MD5_DIGEST_LENGTH) > num)
124 memcpy(km,smd,(num-i));
129 km+=MD5_DIGEST_LENGTH;
131 memset(smd,0,SHA_DIGEST_LENGTH);
135 int ssl3_change_cipher_state(SSL *s, int which)
137 unsigned char *p,*key_block,*mac_secret;
138 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
139 unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
140 unsigned char *ms,*key,*iv,*er1,*er2;
148 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
149 c=s->s3->tmp.new_sym_enc;
150 m=s->s3->tmp.new_hash;
151 if (s->s3->tmp.new_compression == NULL)
154 comp=s->s3->tmp.new_compression->method;
155 key_block=s->s3->tmp.key_block;
157 if (which & SSL3_CC_READ)
159 if ((s->enc_read_ctx == NULL) &&
160 ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
161 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
166 if (s->expand != NULL)
168 COMP_CTX_free(s->expand);
173 s->expand=COMP_CTX_new(comp);
174 if (s->expand == NULL)
176 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
179 if (s->s3->rrec.comp == NULL)
180 s->s3->rrec.comp=(unsigned char *)
181 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
182 if (s->s3->rrec.comp == NULL)
185 memset(&(s->s3->read_sequence[0]),0,8);
186 mac_secret= &(s->s3->read_mac_secret[0]);
190 if ((s->enc_write_ctx == NULL) &&
191 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
192 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
194 dd= s->enc_write_ctx;
197 if (s->compress != NULL)
199 COMP_CTX_free(s->compress);
204 s->compress=COMP_CTX_new(comp);
205 if (s->compress == NULL)
207 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
211 memset(&(s->s3->write_sequence[0]),0,8);
212 mac_secret= &(s->s3->write_mac_secret[0]);
215 EVP_CIPHER_CTX_init(dd);
217 p=s->s3->tmp.key_block;
219 cl=EVP_CIPHER_key_length(c);
220 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
221 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
222 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
223 k=EVP_CIPHER_iv_length(c);
224 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
225 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
228 key= &(p[ n]); n+=j+j;
229 iv= &(p[ n]); n+=k+k;
230 er1= &(s->s3->client_random[0]);
231 er2= &(s->s3->server_random[0]);
236 ms= &(p[ n]); n+=i+j;
237 key= &(p[ n]); n+=j+k;
239 er1= &(s->s3->server_random[0]);
240 er2= &(s->s3->client_random[0]);
243 if (n > s->s3->tmp.key_block_length)
245 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
249 memcpy(mac_secret,ms,i);
252 /* In here I set both the read and write key/iv to the
253 * same value since only the correct one will be used :-).
256 MD5_Update(&md,key,j);
257 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
258 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
259 MD5_Final(&(exp_key[0]),&md);
265 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
266 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
267 MD5_Final(&(exp_iv[0]),&md);
272 s->session->key_arg_length=0;
274 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
276 memset(&(exp_key[0]),0,sizeof(exp_key));
277 memset(&(exp_iv[0]),0,sizeof(exp_iv));
280 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
285 int ssl3_setup_key_block(SSL *s)
293 if (s->s3->tmp.key_block_length != 0)
296 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
298 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
302 s->s3->tmp.new_sym_enc=c;
303 s->s3->tmp.new_hash=hash;
304 s->s3->tmp.new_compression=comp;
306 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
309 ssl3_cleanup_key_block(s);
311 if ((p=OPENSSL_malloc(num)) == NULL)
314 s->s3->tmp.key_block_length=num;
315 s->s3->tmp.key_block=p;
317 return ssl3_generate_key_block(s,p,num);
320 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
324 void ssl3_cleanup_key_block(SSL *s)
326 if (s->s3->tmp.key_block != NULL)
328 memset(s->s3->tmp.key_block,0,
329 s->s3->tmp.key_block_length);
330 OPENSSL_free(s->s3->tmp.key_block);
331 s->s3->tmp.key_block=NULL;
333 s->s3->tmp.key_block_length=0;
336 int ssl3_enc(SSL *s, int send)
342 const EVP_CIPHER *enc;
348 if (s->enc_write_ctx == NULL)
351 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
357 if (s->enc_read_ctx == NULL)
360 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
363 if ((s->session == NULL) || (ds == NULL) ||
366 memcpy(rec->data,rec->input,rec->length);
367 rec->input=rec->data;
372 bs=EVP_CIPHER_block_size(ds->cipher);
376 /* This should be using (bs-1) and bs instead of 7 and 8 */
377 if ((bs != 1) && send)
381 /* we need to add 'i-1' padding bytes */
384 rec->input[l-1]=(i-1);
387 EVP_Cipher(ds,rec->data,rec->input,l);
389 if ((bs != 1) && !send)
394 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
395 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
404 void ssl3_init_finished_mac(SSL *s)
406 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
407 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
410 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
412 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
413 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
416 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
418 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
421 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
422 const char *sender, int len, unsigned char *p)
426 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
428 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
432 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
433 const char *sender, int len, unsigned char *p)
438 unsigned char md_buf[EVP_MAX_MD_SIZE];
441 EVP_MD_CTX_copy(&ctx,in_ctx);
443 n=EVP_MD_CTX_size(&ctx);
447 EVP_DigestUpdate(&ctx,sender,len);
448 EVP_DigestUpdate(&ctx,s->session->master_key,
449 s->session->master_key_length);
450 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
451 EVP_DigestFinal(&ctx,md_buf,&i);
453 EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
454 EVP_DigestUpdate(&ctx,s->session->master_key,
455 s->session->master_key_length);
456 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
457 EVP_DigestUpdate(&ctx,md_buf,i);
458 EVP_DigestFinal(&ctx,p,&ret);
460 memset(&ctx,0,sizeof(EVP_MD_CTX));
465 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
468 unsigned char *mac_sec,*seq;
471 unsigned char *p,rec_char;
472 unsigned int md_size;
477 rec= &(ssl->s3->wrec);
478 mac_sec= &(ssl->s3->write_mac_secret[0]);
479 seq= &(ssl->s3->write_sequence[0]);
480 hash=ssl->write_hash;
484 rec= &(ssl->s3->rrec);
485 mac_sec= &(ssl->s3->read_mac_secret[0]);
486 seq= &(ssl->s3->read_sequence[0]);
490 md_size=EVP_MD_size(hash);
491 npad=(48/md_size)*md_size;
493 /* Chop the digest off the end :-) */
495 EVP_DigestInit( &md_ctx,hash);
496 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
497 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
498 EVP_DigestUpdate(&md_ctx,seq,8);
500 EVP_DigestUpdate(&md_ctx,&rec_char,1);
503 EVP_DigestUpdate(&md_ctx,md,2);
504 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
505 EVP_DigestFinal( &md_ctx,md,NULL);
507 EVP_DigestInit( &md_ctx,hash);
508 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
509 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
510 EVP_DigestUpdate(&md_ctx,md,md_size);
511 EVP_DigestFinal( &md_ctx,md,&md_size);
516 if (seq[i] != 0) break;
522 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
525 static const unsigned char *salt[3]={
526 #ifndef CHARSET_EBCDIC
527 (const unsigned char *)"A",
528 (const unsigned char *)"BB",
529 (const unsigned char *)"CCC",
531 (const unsigned char *)"\x41",
532 (const unsigned char *)"\x42\x42",
533 (const unsigned char *)"\x43\x43\x43",
536 unsigned char buf[EVP_MAX_MD_SIZE];
543 EVP_DigestInit(&ctx,s->ctx->sha1);
544 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
545 EVP_DigestUpdate(&ctx,p,len);
546 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
548 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
550 EVP_DigestFinal(&ctx,buf,&n);
552 EVP_DigestInit(&ctx,s->ctx->md5);
553 EVP_DigestUpdate(&ctx,p,len);
554 EVP_DigestUpdate(&ctx,buf,n);
555 EVP_DigestFinal(&ctx,out,&n);
562 int ssl3_alert_code(int code)
566 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
567 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
568 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
569 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
570 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
571 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
572 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
573 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
574 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
575 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
576 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
577 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
578 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
579 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
580 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
581 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
582 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
583 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
584 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
585 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
586 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
587 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
588 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
589 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */