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_ex(&s1,EVP_sha1(), NULL);
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_ex(&s1,smd,NULL);
118 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
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_ex(&m5,smd,NULL);
125 memcpy(km,smd,(num-i));
128 EVP_DigestFinal_ex(&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;
152 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
153 c=s->s3->tmp.new_sym_enc;
154 m=s->s3->tmp.new_hash;
155 if (s->s3->tmp.new_compression == NULL)
158 comp=s->s3->tmp.new_compression->method;
159 key_block=s->s3->tmp.key_block;
161 if (which & SSL3_CC_READ)
163 if (s->enc_read_ctx != NULL)
165 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
170 if (s->expand != NULL)
172 COMP_CTX_free(s->expand);
177 s->expand=COMP_CTX_new(comp);
178 if (s->expand == NULL)
180 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
183 if (s->s3->rrec.comp == NULL)
184 s->s3->rrec.comp=(unsigned char *)
185 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
186 if (s->s3->rrec.comp == NULL)
189 memset(&(s->s3->read_sequence[0]),0,8);
190 mac_secret= &(s->s3->read_mac_secret[0]);
194 if (s->enc_write_ctx != NULL)
196 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
198 dd= s->enc_write_ctx;
201 if (s->compress != NULL)
203 COMP_CTX_free(s->compress);
208 s->compress=COMP_CTX_new(comp);
209 if (s->compress == NULL)
211 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
215 memset(&(s->s3->write_sequence[0]),0,8);
216 mac_secret= &(s->s3->write_mac_secret[0]);
220 EVP_CIPHER_CTX_cleanup(dd);
221 EVP_CIPHER_CTX_init(dd);
223 p=s->s3->tmp.key_block;
225 cl=EVP_CIPHER_key_length(c);
226 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
227 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
228 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
229 k=EVP_CIPHER_iv_length(c);
230 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
231 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
234 key= &(p[ n]); n+=j+j;
235 iv= &(p[ n]); n+=k+k;
236 er1= &(s->s3->client_random[0]);
237 er2= &(s->s3->server_random[0]);
242 ms= &(p[ n]); n+=i+j;
243 key= &(p[ n]); n+=j+k;
245 er1= &(s->s3->server_random[0]);
246 er2= &(s->s3->client_random[0]);
249 if (n > s->s3->tmp.key_block_length)
251 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
255 EVP_MD_CTX_init(&md);
256 memcpy(mac_secret,ms,i);
259 /* In here I set both the read and write key/iv to the
260 * same value since only the correct one will be used :-).
262 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
263 EVP_DigestUpdate(&md,key,j);
264 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
265 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
266 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
271 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
272 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
273 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
274 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
279 s->session->key_arg_length=0;
281 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
283 memset(&(exp_key[0]),0,sizeof(exp_key));
284 memset(&(exp_iv[0]),0,sizeof(exp_iv));
285 EVP_MD_CTX_cleanup(&md);
288 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
293 int ssl3_setup_key_block(SSL *s)
301 if (s->s3->tmp.key_block_length != 0)
304 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
306 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
310 s->s3->tmp.new_sym_enc=c;
311 s->s3->tmp.new_hash=hash;
312 s->s3->tmp.new_compression=comp;
314 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
317 ssl3_cleanup_key_block(s);
319 if ((p=OPENSSL_malloc(num)) == NULL)
322 s->s3->tmp.key_block_length=num;
323 s->s3->tmp.key_block=p;
325 return ssl3_generate_key_block(s,p,num);
328 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
332 void ssl3_cleanup_key_block(SSL *s)
334 if (s->s3->tmp.key_block != NULL)
336 memset(s->s3->tmp.key_block,0,
337 s->s3->tmp.key_block_length);
338 OPENSSL_free(s->s3->tmp.key_block);
339 s->s3->tmp.key_block=NULL;
341 s->s3->tmp.key_block_length=0;
344 int ssl3_enc(SSL *s, int send)
350 const EVP_CIPHER *enc;
356 if (s->enc_write_ctx == NULL)
359 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
365 if (s->enc_read_ctx == NULL)
368 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
371 if ((s->session == NULL) || (ds == NULL) ||
374 memmove(rec->data,rec->input,rec->length);
375 rec->input=rec->data;
380 bs=EVP_CIPHER_block_size(ds->cipher);
384 if ((bs != 1) && send)
388 /* we need to add 'i-1' padding bytes */
391 rec->input[l-1]=(i-1);
396 if (l == 0 || l%bs != 0)
398 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
399 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
404 EVP_Cipher(ds,rec->data,rec->input,l);
406 if ((bs != 1) && !send)
409 /* SSL 3.0 bounds the number of padding bytes by the block size;
410 * padding bytes (except that last) are arbitrary */
413 /* Incorrect padding. SSLerr() and ssl3_alert are done
414 * by caller: we don't want to reveal whether this is
415 * a decryption error or a MAC verification failure
416 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
425 void ssl3_init_finished_mac(SSL *s)
427 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
428 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
431 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
433 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
434 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
437 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
439 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
442 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
443 const char *sender, int len, unsigned char *p)
447 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
449 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
453 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
454 const char *sender, int len, unsigned char *p)
459 unsigned char md_buf[EVP_MAX_MD_SIZE];
462 EVP_MD_CTX_init(&ctx);
463 EVP_MD_CTX_copy_ex(&ctx,in_ctx);
465 n=EVP_MD_CTX_size(&ctx);
469 EVP_DigestUpdate(&ctx,sender,len);
470 EVP_DigestUpdate(&ctx,s->session->master_key,
471 s->session->master_key_length);
472 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
473 EVP_DigestFinal_ex(&ctx,md_buf,&i);
475 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
476 EVP_DigestUpdate(&ctx,s->session->master_key,
477 s->session->master_key_length);
478 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
479 EVP_DigestUpdate(&ctx,md_buf,i);
480 EVP_DigestFinal_ex(&ctx,p,&ret);
482 EVP_MD_CTX_cleanup(&ctx);
487 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
490 unsigned char *mac_sec,*seq;
493 unsigned char *p,rec_char;
494 unsigned int md_size;
499 rec= &(ssl->s3->wrec);
500 mac_sec= &(ssl->s3->write_mac_secret[0]);
501 seq= &(ssl->s3->write_sequence[0]);
502 hash=ssl->write_hash;
506 rec= &(ssl->s3->rrec);
507 mac_sec= &(ssl->s3->read_mac_secret[0]);
508 seq= &(ssl->s3->read_sequence[0]);
512 md_size=EVP_MD_size(hash);
513 npad=(48/md_size)*md_size;
515 /* Chop the digest off the end :-) */
516 EVP_MD_CTX_init(&md_ctx);
518 EVP_DigestInit_ex( &md_ctx,hash, NULL);
519 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
520 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
521 EVP_DigestUpdate(&md_ctx,seq,8);
523 EVP_DigestUpdate(&md_ctx,&rec_char,1);
526 EVP_DigestUpdate(&md_ctx,md,2);
527 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
528 EVP_DigestFinal_ex( &md_ctx,md,NULL);
530 EVP_DigestInit_ex( &md_ctx,hash, NULL);
531 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
532 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
533 EVP_DigestUpdate(&md_ctx,md,md_size);
534 EVP_DigestFinal_ex( &md_ctx,md,&md_size);
536 EVP_MD_CTX_cleanup(&md_ctx);
541 if (seq[i] != 0) break;
547 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
550 static const unsigned char *salt[3]={
551 #ifndef CHARSET_EBCDIC
552 (const unsigned char *)"A",
553 (const unsigned char *)"BB",
554 (const unsigned char *)"CCC",
556 (const unsigned char *)"\x41",
557 (const unsigned char *)"\x42\x42",
558 (const unsigned char *)"\x43\x43\x43",
561 unsigned char buf[EVP_MAX_MD_SIZE];
566 EVP_MD_CTX_init(&ctx);
569 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
570 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
571 EVP_DigestUpdate(&ctx,p,len);
572 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
574 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
576 EVP_DigestFinal_ex(&ctx,buf,&n);
578 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
579 EVP_DigestUpdate(&ctx,p,len);
580 EVP_DigestUpdate(&ctx,buf,n);
581 EVP_DigestFinal_ex(&ctx,out,&n);
585 EVP_MD_CTX_cleanup(&ctx);
589 int ssl3_alert_code(int code)
593 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
594 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
595 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
596 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
597 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
598 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
599 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
600 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
601 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
602 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
603 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
604 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
605 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
606 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
607 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
608 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
609 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
610 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
611 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
612 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
613 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
614 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
615 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
616 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */