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(&s1,EVP_sha1());
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(&s1,smd,NULL);
118 EVP_DigestInit(&m5,EVP_md5());
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(&m5,smd,NULL);
125 memcpy(km,smd,(num-i));
128 EVP_DigestFinal(&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;
151 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
152 c=s->s3->tmp.new_sym_enc;
153 m=s->s3->tmp.new_hash;
154 if (s->s3->tmp.new_compression == NULL)
157 comp=s->s3->tmp.new_compression->method;
158 key_block=s->s3->tmp.key_block;
160 if (which & SSL3_CC_READ)
162 if ((s->enc_read_ctx == NULL) &&
163 ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
164 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
169 if (s->expand != NULL)
171 COMP_CTX_free(s->expand);
176 s->expand=COMP_CTX_new(comp);
177 if (s->expand == NULL)
179 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
182 if (s->s3->rrec.comp == NULL)
183 s->s3->rrec.comp=(unsigned char *)
184 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
185 if (s->s3->rrec.comp == NULL)
188 memset(&(s->s3->read_sequence[0]),0,8);
189 mac_secret= &(s->s3->read_mac_secret[0]);
193 if ((s->enc_write_ctx == NULL) &&
194 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
195 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
197 dd= s->enc_write_ctx;
200 if (s->compress != NULL)
202 COMP_CTX_free(s->compress);
207 s->compress=COMP_CTX_new(comp);
208 if (s->compress == NULL)
210 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
214 memset(&(s->s3->write_sequence[0]),0,8);
215 mac_secret= &(s->s3->write_mac_secret[0]);
218 EVP_CIPHER_CTX_init(dd);
220 p=s->s3->tmp.key_block;
222 cl=EVP_CIPHER_key_length(c);
223 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
224 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
225 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
226 k=EVP_CIPHER_iv_length(c);
227 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
228 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
231 key= &(p[ n]); n+=j+j;
232 iv= &(p[ n]); n+=k+k;
233 er1= &(s->s3->client_random[0]);
234 er2= &(s->s3->server_random[0]);
239 ms= &(p[ n]); n+=i+j;
240 key= &(p[ n]); n+=j+k;
242 er1= &(s->s3->server_random[0]);
243 er2= &(s->s3->client_random[0]);
246 if (n > s->s3->tmp.key_block_length)
248 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
252 EVP_MD_CTX_init(&md);
253 memcpy(mac_secret,ms,i);
256 /* In here I set both the read and write key/iv to the
257 * same value since only the correct one will be used :-).
259 EVP_DigestInit(&md,EVP_md5());
260 EVP_DigestUpdate(&md,key,j);
261 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
262 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
263 EVP_DigestFinal(&md,&(exp_key[0]),NULL);
268 EVP_DigestInit(&md,EVP_md5());
269 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
270 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
271 EVP_DigestFinal(&md,&(exp_iv[0]),NULL);
276 s->session->key_arg_length=0;
278 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
280 memset(&(exp_key[0]),0,sizeof(exp_key));
281 memset(&(exp_iv[0]),0,sizeof(exp_iv));
282 EVP_MD_CTX_cleanup(&md);
285 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
290 int ssl3_setup_key_block(SSL *s)
298 if (s->s3->tmp.key_block_length != 0)
301 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
303 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
307 s->s3->tmp.new_sym_enc=c;
308 s->s3->tmp.new_hash=hash;
309 s->s3->tmp.new_compression=comp;
311 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
314 ssl3_cleanup_key_block(s);
316 if ((p=OPENSSL_malloc(num)) == NULL)
319 s->s3->tmp.key_block_length=num;
320 s->s3->tmp.key_block=p;
322 return ssl3_generate_key_block(s,p,num);
325 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
329 void ssl3_cleanup_key_block(SSL *s)
331 if (s->s3->tmp.key_block != NULL)
333 memset(s->s3->tmp.key_block,0,
334 s->s3->tmp.key_block_length);
335 OPENSSL_free(s->s3->tmp.key_block);
336 s->s3->tmp.key_block=NULL;
338 s->s3->tmp.key_block_length=0;
341 int ssl3_enc(SSL *s, int send)
347 const EVP_CIPHER *enc;
353 if (s->enc_write_ctx == NULL)
356 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
362 if (s->enc_read_ctx == NULL)
365 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
368 if ((s->session == NULL) || (ds == NULL) ||
371 memmove(rec->data,rec->input,rec->length);
372 rec->input=rec->data;
377 bs=EVP_CIPHER_block_size(ds->cipher);
381 if ((bs != 1) && send)
385 /* we need to add 'i-1' padding bytes */
388 rec->input[l-1]=(i-1);
393 if (l == 0 || l%bs != 0)
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);
401 EVP_Cipher(ds,rec->data,rec->input,l);
403 if ((bs != 1) && !send)
406 /* SSL 3.0 bounds the number of padding bytes by the block size;
407 * padding bytes (except that last) are arbitrary */
410 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
411 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
420 void ssl3_init_finished_mac(SSL *s)
422 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
423 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
426 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
428 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
429 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
432 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
434 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
437 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
438 const char *sender, int len, unsigned char *p)
442 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
444 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
448 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
449 const char *sender, int len, unsigned char *p)
454 unsigned char md_buf[EVP_MAX_MD_SIZE];
457 EVP_MD_CTX_init(&ctx);
458 EVP_MD_CTX_copy(&ctx,in_ctx);
460 n=EVP_MD_CTX_size(&ctx);
464 EVP_DigestUpdate(&ctx,sender,len);
465 EVP_DigestUpdate(&ctx,s->session->master_key,
466 s->session->master_key_length);
467 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
468 EVP_DigestFinal(&ctx,md_buf,&i);
470 EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
471 EVP_DigestUpdate(&ctx,s->session->master_key,
472 s->session->master_key_length);
473 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
474 EVP_DigestUpdate(&ctx,md_buf,i);
475 EVP_DigestFinal(&ctx,p,&ret);
477 EVP_MD_CTX_cleanup(&ctx);
482 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
485 unsigned char *mac_sec,*seq;
488 unsigned char *p,rec_char;
489 unsigned int md_size;
494 rec= &(ssl->s3->wrec);
495 mac_sec= &(ssl->s3->write_mac_secret[0]);
496 seq= &(ssl->s3->write_sequence[0]);
497 hash=ssl->write_hash;
501 rec= &(ssl->s3->rrec);
502 mac_sec= &(ssl->s3->read_mac_secret[0]);
503 seq= &(ssl->s3->read_sequence[0]);
507 md_size=EVP_MD_size(hash);
508 npad=(48/md_size)*md_size;
510 /* Chop the digest off the end :-) */
511 EVP_MD_CTX_init(&md_ctx);
513 EVP_DigestInit( &md_ctx,hash);
514 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
515 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
516 EVP_DigestUpdate(&md_ctx,seq,8);
518 EVP_DigestUpdate(&md_ctx,&rec_char,1);
521 EVP_DigestUpdate(&md_ctx,md,2);
522 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
523 EVP_DigestFinal( &md_ctx,md,NULL);
525 EVP_DigestInit( &md_ctx,hash);
526 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
527 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
528 EVP_DigestUpdate(&md_ctx,md,md_size);
529 EVP_DigestFinal( &md_ctx,md,&md_size);
531 EVP_MD_CTX_cleanup(&md_ctx);
536 if (seq[i] != 0) break;
542 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
545 static const unsigned char *salt[3]={
546 #ifndef CHARSET_EBCDIC
547 (const unsigned char *)"A",
548 (const unsigned char *)"BB",
549 (const unsigned char *)"CCC",
551 (const unsigned char *)"\x41",
552 (const unsigned char *)"\x42\x42",
553 (const unsigned char *)"\x43\x43\x43",
556 unsigned char buf[EVP_MAX_MD_SIZE];
561 EVP_MD_CTX_init(&ctx);
564 EVP_DigestInit(&ctx,s->ctx->sha1);
565 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
566 EVP_DigestUpdate(&ctx,p,len);
567 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
569 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
571 EVP_DigestFinal(&ctx,buf,&n);
573 EVP_DigestInit(&ctx,s->ctx->md5);
574 EVP_DigestUpdate(&ctx,p,len);
575 EVP_DigestUpdate(&ctx,buf,n);
576 EVP_DigestFinal(&ctx,out,&n);
580 EVP_MD_CTX_cleanup(&ctx);
584 int ssl3_alert_code(int code)
588 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
589 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
590 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
591 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
592 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
593 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
594 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
595 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
596 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
597 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
598 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
599 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
600 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
601 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
602 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
603 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
604 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
605 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
606 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
607 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
608 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
609 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
610 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
611 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */