5 * ssl manipulation functions
6 * By Paolo Abeni <paolo.abeni@email.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #include "packet-ssl-utils.h"
33 ssl_data_set(StringInfo* str, unsigned char* data, unsigned int len)
35 memcpy(str->data, data, len);
41 /* hmac abstraction layer */
42 #define SSL_HMAC gcry_md_hd_t
45 ssl_hmac_init(SSL_HMAC* md, const void * key, int len, int algo)
49 gcry_md_open(md,algo, GCRY_MD_FLAG_HMAC);
50 gcry_md_setkey (*(md), key, len);
54 ssl_hmac_update(SSL_HMAC* md, const void* data, int len)
56 gcry_md_write(*(md), data, len);
59 ssl_hmac_final(SSL_HMAC* md, unsigned char* data, unsigned int* datalen)
61 int algo = gcry_md_get_algo (*(md));
62 unsigned int len = gcry_md_get_algo_dlen(algo);
63 memcpy(data, gcry_md_read(*(md), algo), len);
67 ssl_hmac_cleanup(SSL_HMAC* md)
72 /* memory digest abstraction layer*/
73 #define SSL_MD gcry_md_hd_t
76 ssl_md_init(SSL_MD* md, int algo)
80 gcry_md_open(md,algo, 0);
83 ssl_md_update(SSL_MD* md, unsigned char* data, int len)
85 gcry_md_write(*(md), data, len);
88 ssl_md_final(SSL_MD* md, unsigned char* data, unsigned int* datalen)
90 int algo = gcry_md_get_algo (*(md));
91 int len = gcry_md_get_algo_dlen (algo);
92 memcpy(data, gcry_md_read(*(md), algo), len);
96 ssl_md_cleanup(SSL_MD* md) { gcry_md_close(*(md)); }
98 /* md5 /sha abstraction layer */
99 #define SSL_SHA_CTX gcry_md_hd_t
100 #define SSL_MD5_CTX gcry_md_hd_t
103 ssl_sha_init(SSL_SHA_CTX* md)
106 gcry_md_close(*(md));
107 gcry_md_open(md,GCRY_MD_SHA1, 0);
110 ssl_sha_update(SSL_SHA_CTX* md, unsigned char* data, int len)
112 gcry_md_write(*(md), data, len);
115 ssl_sha_final(unsigned char* buf, SSL_SHA_CTX* md)
117 memcpy(buf, gcry_md_read(*(md), GCRY_MD_SHA1),
118 gcry_md_get_algo_dlen(GCRY_MD_SHA1));
122 ssl_md5_init(SSL_MD5_CTX* md)
125 gcry_md_close(*(md));
126 return gcry_md_open(md,GCRY_MD_MD5, 0);
129 ssl_md5_update(SSL_MD5_CTX* md, unsigned char* data, int len)
131 gcry_md_write(*(md), data, len);
134 ssl_md5_final(unsigned char* buf, SSL_MD5_CTX* md)
136 memcpy(buf, gcry_md_read(*(md), GCRY_MD_MD5),
137 gcry_md_get_algo_dlen(GCRY_MD_MD5));
141 /* stream cipher abstraction layer*/
143 ssl_cipher_init(gcry_cipher_hd_t *cipher, int algo, unsigned char* sk,
144 unsigned char* iv, int mode)
147 GCRY_CIPHER_MODE_STREAM,
150 int err = gcry_cipher_open(cipher, algo, gcry_modes[mode], 0);
153 err = gcry_cipher_setkey(*(cipher), sk, gcry_cipher_get_algo_keylen (algo));
156 err = gcry_cipher_setiv(*(cipher), iv, gcry_cipher_get_algo_blklen (algo));
162 ssl_cipher_decrypt(gcry_cipher_hd_t *cipher, unsigned char * out, int outl,
163 const unsigned char * in,int inl)
165 return gcry_cipher_decrypt ( *(cipher), out, outl, in, inl);
168 ssl_get_digest_by_name(const char*name)
170 return gcry_md_map_name(name);
173 ssl_get_cipher_by_name(const char* name)
175 return gcry_cipher_map_name(name);
178 /* private key abstraction layer */
180 ssl_get_key_len(SSL_PRIVATE_KEY* pk) {return gcry_pk_get_nbits (pk); }
183 _gcry_rsa_decrypt (int algo, gcry_mpi_t *result, gcry_mpi_t *data,
184 gcry_mpi_t *skey, int flags);
186 #define PUBKEY_FLAG_NO_BLINDING (1 << 0)
188 /* decrypt data with private key. Store decrypted data directly into input
191 ssl_private_decrypt(unsigned int len, unsigned char* encr_data, SSL_PRIVATE_KEY* pk)
195 gcry_sexp_t s_data, s_plain;
197 size_t i, encr_len = len;
198 unsigned char* decr_data_ptr;
199 gcry_mpi_t text=NULL;
201 /* build up a mpi rappresentation for encrypted data */
202 rc = gcry_mpi_scan(&encr_mpi, GCRYMPI_FMT_USG,encr_data, encr_len, &encr_len);
204 ssl_debug_printf("pcry_private_decrypt: can't convert encr_data to mpi (size %d):%s\n",
205 len, gcry_strerror(rc));
210 /* put the data into a simple list */
211 rc = gcry_sexp_build(&s_data, NULL, "(enc-val(rsa(a%m)))", encr_mpi);
213 ssl_debug_printf("pcry_private_decrypt: can't build encr_sexp:%s \n",
218 /* pass it to libgcrypt */
219 rc = gcry_pk_decrypt(&s_plain, s_data, pk);
220 gcry_sexp_release(s_data);
223 ssl_debug_printf("pcry_private_decrypt: can't decrypt key:%s\n",
228 /* convert plain text sexp to mpi format */
229 text = gcry_sexp_nth_mpi(s_plain, 0, 0);
231 /* compute size requested for plaintext buffer */
233 if (gcry_mpi_print(GCRYMPI_FMT_USG, NULL, decr_len, &decr_len, text) != 0) {
234 ssl_debug_printf("pcry_private_decrypt: can't compute decr size:%s\n",
240 /* sanity check on out buffer */
241 if (decr_len > len) {
242 ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
247 /* write plain text to encrypted data buffer */
248 decr_data_ptr = encr_data;
249 if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
251 ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
252 decr_len, gcry_strerror(rc));
253 g_free(decr_data_ptr);
258 /* strip the padding*/
260 for (i = 1; i < decr_len; i++) {
261 if (decr_data_ptr[i] == 0) {
267 ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
269 ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
270 g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
274 gcry_sexp_release(s_plain);
276 rc = _gcry_rsa_decrypt(0, &text, &encr_mpi, pk,0);
277 gcry_mpi_print( GCRYMPI_FMT_USG, 0, 0, &decr_len, text);
279 /* sanity check on out buffer */
280 if (decr_len > len) {
281 ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
286 /* write plain text to newly allocated buffer */
287 decr_data_ptr = encr_data;
288 if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
290 ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
291 decr_len, gcry_strerror(rc));
295 /* strip the padding*/
297 for (i = 1; i < decr_len; i++) {
298 if (decr_data_ptr[i] == 0) {
304 ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
306 ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
307 g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
309 #endif /* SSL_FAST */
310 gcry_mpi_release(text);
314 /* stringinfo interface */
316 ssl_data_alloc(StringInfo* str, unsigned int len)
318 str->data = g_malloc(len);
325 #define PRF(ssl,secret,usage,rnd1,rnd2,out) ((ssl->version_netorder==SSLV3_VERSION)? \
326 ssl3_prf(secret,usage,rnd1,rnd2,out): \
327 tls_prf(secret,usage,rnd1,rnd2,out))
329 static const char *digests[]={
334 static const char *ciphers[]={
337 "ARCFOUR", /* gnutls does not support rc4, but this should be 100% compatible*/
344 /* look in openssl/ssl/ssl_lib.c for a complete list of available cipersuite*/
345 static SslCipherSuite cipher_suites[]={
346 {1,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
347 {2,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
348 {3,KEX_RSA,SIG_RSA,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
349 {4,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
350 {5,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
351 {6,KEX_RSA,SIG_RSA,ENC_RC2,8,128,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
352 {7,KEX_RSA,SIG_RSA,ENC_IDEA,8,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
353 {8,KEX_RSA,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
354 {9,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
355 {10,KEX_RSA,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
356 {11,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
357 {12,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
358 {13,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
359 {14,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
360 {15,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
361 {16,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
362 {17,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
363 {18,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
364 {19,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
365 {20,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
366 {21,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
367 {22,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
368 {23,KEX_DH,SIG_NONE,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
369 {24,KEX_DH,SIG_NONE,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
370 {25,KEX_DH,SIG_NONE,ENC_DES,8,64,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
371 {26,KEX_DH,SIG_NONE,ENC_DES,8,64,64,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
372 {27,KEX_DH,SIG_NONE,ENC_3DES,8,192,192,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
373 {47,KEX_RSA,SIG_RSA,ENC_AES,16,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
374 {53,KEX_RSA,SIG_RSA,ENC_AES256,16,256,256,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
375 {96,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
376 {97,KEX_RSA,SIG_RSA,ENC_RC2,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
377 {98,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
378 {99,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,16,1, SSL_CIPHER_MODE_STREAM},
379 {100,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
380 {101,KEX_DH,SIG_DSS,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
381 {102,KEX_DH,SIG_DSS,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
382 {-1, 0,0,0,0,0,0,0,0,0, 0}
385 #define MAX_BLOCK_SIZE 16
386 #define MAX_KEY_SIZE 32
389 ssl_find_cipher(int num,SslCipherSuite* cs)
393 for(c=cipher_suites;c->number!=-1;c++){
404 tls_hash(StringInfo* secret,
405 StringInfo* seed, int md, StringInfo* out)
407 guint8 *ptr=out->data;
408 unsigned int left=out->data_len;
411 guint8 _A[20],tmp[20];
412 unsigned int A_l,tmp_l;
415 memset(&hm, 0, sizeof(hm));
416 ssl_print_string("tls_hash: hash secret", secret);
417 ssl_print_string("tls_hash: hash seed", seed);
422 ssl_hmac_init(&hm,secret->data,secret->data_len,md);
423 ssl_hmac_update(&hm,A,A_l);
424 ssl_hmac_final(&hm,_A,&A_l);
427 ssl_hmac_init(&hm,secret->data,secret->data_len,md);
428 ssl_hmac_update(&hm,A,A_l);
429 ssl_hmac_update(&hm,seed->data,seed->data_len);
430 ssl_hmac_final(&hm,tmp,&tmp_l);
432 tocpy=MIN(left,tmp_l);
433 memcpy(ptr,tmp,tocpy);
438 ssl_hmac_cleanup(&hm);
439 ssl_print_string("hash out", out);
444 tls_prf(StringInfo* secret, const char *usage,
445 StringInfo* rnd1, StringInfo* rnd2, StringInfo* out)
447 StringInfo seed, sha_out, md5_out;
450 unsigned int i,s_l, r=-1;
451 int usage_len = strlen(usage);
453 /* initalize buffer for sha, md5 random seed*/
454 if (ssl_data_alloc(&sha_out, MAX(out->data_len,20)) < 0)
456 if (ssl_data_alloc(&md5_out, MAX(out->data_len,16)) < 0)
458 if (ssl_data_alloc(&seed, usage_len+rnd1->data_len+rnd2->data_len) < 0)
462 memcpy(ptr,usage,usage_len); ptr+=usage_len;
463 memcpy(ptr,rnd1->data,rnd1->data_len); ptr+=rnd1->data_len;
464 memcpy(ptr,rnd2->data,rnd2->data_len); ptr+=rnd2->data_len;
466 /* initalize buffer for client/server seeds*/
467 s_l=secret->data_len/2 + secret->data_len%2;
468 if (ssl_data_alloc(&s1, s_l) < 0)
470 if (ssl_data_alloc(&s2, s_l) < 0)
473 memcpy(s1.data,secret->data,s_l);
474 memcpy(s2.data,secret->data + (secret->data_len - s_l),s_l);
476 ssl_debug_printf("tls_prf: tls_hash(md5 secret_len %d seed_len %d )\n", s1.data_len, seed.data_len);
477 if(tls_hash(&s1,&seed,ssl_get_digest_by_name("MD5"),&md5_out) != 0)
479 ssl_debug_printf("tls_prf: tls_hash(sha)\n");
480 if(tls_hash(&s2,&seed,ssl_get_digest_by_name("SHA1"),&sha_out) != 0)
483 for(i=0;i<out->data_len;i++)
484 out->data[i]=md5_out.data[i] ^ sha_out.data[i];
487 ssl_print_string("PRF out",out);
502 ssl3_generate_export_iv(StringInfo* r1,
503 StringInfo* r2, StringInfo* out)
508 memset(&md5, 0, sizeof(md5));
510 ssl_md5_update(&md5,r1->data,r1->data_len);
511 ssl_md5_update(&md5,r2->data,r2->data_len);
512 ssl_md5_final(tmp,&md5);
514 memcpy(out->data,tmp,out->data_len);
515 ssl_print_string("export iv", out);
521 ssl3_prf(StringInfo* secret, const char* usage,
523 StringInfo* r2,StringInfo* out)
527 StringInfo *rnd1,*rnd2;
534 memset(&md5,0,sizeof(md5));
536 memset(&sha,0,sizeof(sha));
539 for(off=0;off<out->data_len;off+=16){
540 unsigned char outbuf[16];
544 ssl_debug_printf("ssl3_prf: sha1_update(%d)\n",i);
545 /* A, BB, CCC, ... */
550 ssl_sha_update(&sha,buf,i);
552 ssl_sha_update(&sha,secret->data,secret->data_len);
554 if(!strcmp(usage,"client write key") || !strcmp(usage,"server write key")){
555 ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
556 ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
559 ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
560 ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
563 ssl_sha_final(buf,&sha);
567 ssl_debug_printf("ssl3_prf: md5_update(%d)\n",i);
568 ssl_md5_update(&md5,secret->data,secret->data_len);
569 ssl_md5_update(&md5,buf,20);
570 ssl_md5_final(outbuf,&md5);
571 tocpy=MIN(out->data_len-off,16);
572 memcpy(out->data+off,outbuf,tocpy);
581 ssl_create_decoder(SslDecoder *dec, SslCipherSuite *cipher_suite,
582 guint8 *mk, guint8 *sk, guint8 *iv)
586 /* Find the SSLeay cipher */
587 if(cipher_suite->enc!=ENC_NULL) {
588 ssl_debug_printf("ssl_create_decoder CIPHER: %s\n", ciphers[cipher_suite->enc-0x30]);
589 ciph=ssl_get_cipher_by_name(ciphers[cipher_suite->enc-0x30]);
592 ssl_debug_printf("ssl_create_decoder can't find cipher %s\n",
593 ciphers[cipher_suite->enc-0x30]);
597 /* init mac buffer: mac storage is embedded into decoder struct to save a
598 memory allocation and waste samo more memory*/
599 dec->cipher_suite=cipher_suite;
600 dec->mac_key.data = dec->_mac_key;
601 ssl_data_set(&dec->mac_key, mk, cipher_suite->dig_len);
603 if (ssl_cipher_init(&dec->evp,ciph,sk,iv,cipher_suite->mode) < 0) {
604 ssl_debug_printf("ssl_create_decoder: can't create cipher id:%d mode:%d\n",
605 ciph, cipher_suite->mode);
609 ssl_debug_printf("decoder initialized (digest len %d)\n", cipher_suite->dig_len);
614 ssl_generate_keyring_material(SslDecryptSession*ssl_session)
616 StringInfo key_block;
617 guint8 _iv_c[MAX_BLOCK_SIZE],_iv_s[MAX_BLOCK_SIZE];
618 guint8 _key_c[MAX_KEY_SIZE],_key_s[MAX_KEY_SIZE];
620 guint8 *ptr,*c_wk,*s_wk,*c_mk,*s_mk,*c_iv = _iv_c,*s_iv = _iv_s;
622 /* if master_key is not yet generate, create it now*/
623 if (!(ssl_session->state & SSL_MASTER_SECRET)) {
624 ssl_debug_printf("ssl_generate_keyring_material:PRF(pre_master_secret)\n");
625 if (PRF(ssl_session,&ssl_session->pre_master_secret,"master secret",
626 &ssl_session->client_random,
627 &ssl_session->server_random, &ssl_session->master_secret)) {
628 ssl_debug_printf("ssl_generate_keyring_material can't generate master_secret\n");
631 ssl_print_string("master secret",&ssl_session->master_secret);
634 /* Compute the key block. First figure out how much data we need*/
635 needed=ssl_session->cipher_suite.dig_len*2;
636 needed+=ssl_session->cipher_suite.bits / 4;
637 if(ssl_session->cipher_suite.block>1)
638 needed+=ssl_session->cipher_suite.block*2;
640 key_block.data_len = needed;
641 key_block.data = g_malloc(needed);
642 if (!key_block.data) {
643 ssl_debug_printf("ssl_generate_keyring_material can't allacate key_block\n");
646 ssl_debug_printf("ssl_generate_keyring_material sess key generation\n");
647 if (PRF(ssl_session,&ssl_session->master_secret,"key expansion",
648 &ssl_session->server_random,&ssl_session->client_random,
650 ssl_debug_printf("ssl_generate_keyring_material can't generate key_block\n");
653 ssl_print_string("key expansion", &key_block);
656 c_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
657 s_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
659 c_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
660 s_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
662 if(ssl_session->cipher_suite.block>1){
663 c_iv=ptr; ptr+=ssl_session->cipher_suite.block;
664 s_iv=ptr; ptr+=ssl_session->cipher_suite.block;
667 if(ssl_session->cipher_suite.export){
668 StringInfo iv_c,iv_s;
669 StringInfo key_c,key_s;
672 if(ssl_session->cipher_suite.block>1){
674 /* We only have room for MAX_BLOCK_SIZE bytes IVs, but that's
675 all we should need. This is a sanity check */
676 if(ssl_session->cipher_suite.block>MAX_BLOCK_SIZE) {
677 ssl_debug_printf("ssl_generate_keyring_material cipher suite block must be at most %d nut is %d\n",
678 MAX_BLOCK_SIZE, ssl_session->cipher_suite.block);
683 iv_c.data_len = ssl_session->cipher_suite.block;
685 iv_s.data_len = ssl_session->cipher_suite.block;
687 if(ssl_session->version_netorder==SSLV3_VERSION){
688 ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv\n");
689 if (ssl3_generate_export_iv(&ssl_session->client_random,
690 &ssl_session->server_random,&iv_c)) {
691 ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 client iv\n");
694 ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv(2)\n");
695 if (ssl3_generate_export_iv(&ssl_session->server_random,
696 &ssl_session->client_random,&iv_s)) {
697 ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 server iv\n");
702 guint8 _iv_block[MAX_BLOCK_SIZE * 2];
707 key_null.data = &_key_null;
708 key_null.data_len = 0;
710 iv_block.data = _iv_block;
711 iv_block.data_len = ssl_session->cipher_suite.block*2;
713 ssl_debug_printf("ssl_generate_keyring_material prf(iv_block)\n");
714 if(PRF(ssl_session,&key_null, "IV block",
715 &ssl_session->client_random,
716 &ssl_session->server_random,&iv_block)) {
717 ssl_debug_printf("ssl_generate_keyring_material can't generate tls31 iv block\n");
721 memcpy(_iv_c,iv_block.data,ssl_session->cipher_suite.block);
722 memcpy(_iv_s,iv_block.data+ssl_session->cipher_suite.block,
723 ssl_session->cipher_suite.block);
730 if (ssl_session->version_netorder==SSLV3_VERSION){
733 ssl_debug_printf("ssl_generate_keyring_material MD5(client_random)\n");
735 memset(&md5, 0, sizeof(md5));
737 ssl_md5_update(&md5,c_wk,ssl_session->cipher_suite.eff_bits/8);
738 ssl_md5_update(&md5,ssl_session->client_random.data,
739 ssl_session->client_random.data_len);
740 ssl_md5_update(&md5,ssl_session->server_random.data,
741 ssl_session->server_random.data_len);
742 ssl_md5_final(_key_c,&md5);
746 ssl_debug_printf("ssl_generate_keyring_material MD5(server_random)\n");
747 ssl_md5_update(&md5,s_wk,ssl_session->cipher_suite.eff_bits/8);
748 ssl_md5_update(&md5,ssl_session->server_random.data,
749 ssl_session->server_random.data_len);
750 ssl_md5_update(&md5,ssl_session->client_random.data,
751 ssl_session->client_random.data_len);
752 ssl_md5_final(_key_s,&md5);
757 key_c.data_len = sizeof(_key_c);
759 key_s.data_len = sizeof(_key_s);
762 k.data_len = ssl_session->cipher_suite.eff_bits/8;
763 ssl_debug_printf("ssl_generate_keyring_material PRF(key_c)\n");
764 if (PRF(ssl_session,&k,"client write key",
765 &ssl_session->client_random,
766 &ssl_session->server_random, &key_c)) {
767 ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 server key \n");
773 k.data_len = ssl_session->cipher_suite.eff_bits/8;
774 ssl_debug_printf("ssl_generate_keyring_material PRF(key_s)\n");
775 if(PRF(ssl_session,&k,"server write key",
776 &ssl_session->client_random,
777 &ssl_session->server_random, &key_s)) {
778 ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 client key \n");
785 /* show key material info */
786 ssl_print_data("Client MAC key",c_mk,ssl_session->cipher_suite.dig_len);
787 ssl_print_data("Server MAC key",s_mk,ssl_session->cipher_suite.dig_len);
788 ssl_print_data("Client Write key",c_wk,ssl_session->cipher_suite.bits/8);
789 ssl_print_data("Server Write key",s_wk,ssl_session->cipher_suite.bits/8);
791 if(ssl_session->cipher_suite.block>1) {
792 ssl_print_data("Client Write IV",c_iv,ssl_session->cipher_suite.block);
793 ssl_print_data("Server Write IV",s_iv,ssl_session->cipher_suite.block);
796 ssl_print_data("Client Write IV",c_iv,8);
797 ssl_print_data("Server Write IV",s_iv,8);
800 /* create both client and server ciphers*/
801 ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(client)\n");
802 if (ssl_create_decoder(&ssl_session->client,
803 &ssl_session->cipher_suite,c_mk,c_wk,c_iv)) {
804 ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
807 ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(server)\n");
808 if (ssl_create_decoder(&ssl_session->server,
809 &ssl_session->cipher_suite,s_mk,s_wk,s_iv)) {
810 ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
814 g_free(key_block.data);
818 free(key_block.data);
823 ssl_decrypt_pre_master_secret(SslDecryptSession*ssl_session,
824 StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
828 if(ssl_session->cipher_suite.kex!=KEX_RSA) {
829 ssl_debug_printf("ssl_decrypt_pre_master_secret key %d diferent from KEX_RSA(%d)\n",
830 ssl_session->cipher_suite.kex, KEX_RSA);
835 /* can't find any place where ephemeral_rsa is set ...*/
836 if(d->ephemeral_rsa) {
837 ssl_debug_printf("ssl_decrypt_pre_master_secret ephimeral RSA\n");
842 /* with tls key loading will fail if not rsa type, so no need to check*/
843 ssl_print_string("pre master encrypted",entrypted_pre_master);
844 ssl_debug_printf("ssl_decrypt_pre_master_secret:RSA_private_decrypt\n");
845 i=ssl_private_decrypt(entrypted_pre_master->data_len,
846 entrypted_pre_master->data, pk);
849 ssl_debug_printf("ssl_decrypt_pre_master_secret wrong "
850 "pre_master_secret lenght (%d, expected %d)\n", i, 48);
854 /* the decrypted data has been written into the pre_master key buffer */
855 ssl_session->pre_master_secret.data = entrypted_pre_master->data;
856 ssl_session->pre_master_secret.data_len=48;
857 ssl_print_string("pre master secret",&ssl_session->pre_master_secret);
859 /* Remove the master secret if it was there.
860 This force keying material regeneration in
861 case we're renegotiating */
862 ssl_session->state &= ~SSL_MASTER_SECRET;
866 #define MSB(a) ((a>>8)&0xff)
867 #define LSB(a) (a&0xff)
869 /* convert network byte order 32 byte number to right-aligned host byte order *
871 static int fmt_seq(guint32 num, guint8* buf)
877 memcpy(buf+4,&netnum,4);
883 tls_check_mac(SslDecoder*decoder, int ct,int ver, guint8* data,
884 guint32 datalen, guint8* mac)
891 memset(&hm, 0, sizeof(hm));
892 md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
893 ssl_debug_printf("tls_check_mac mac type:%s md %d\n",
894 digests[decoder->cipher_suite->dig-0x40], md);
896 ssl_hmac_init(&hm,decoder->mac_key.data,decoder->mac_key.data_len,md);
898 fmt_seq(decoder->seq,buf);
900 ssl_hmac_update(&hm,buf,8);
903 ssl_hmac_update(&hm,buf,1);
907 ssl_hmac_update(&hm,buf,2);
911 ssl_hmac_update(&hm,buf,2);
913 ssl_hmac_update(&hm,data,datalen);
915 ssl_hmac_final(&hm,buf,&l);
916 ssl_print_data("Mac", buf, l);
917 if(memcmp(mac,buf,l))
920 ssl_hmac_cleanup(&hm);
925 ssl3_check_mac(SslDecoder*decoder,int ct,guint8* data,
926 guint32 datalen, guint8* mac)
931 guint8 buf[64],dgst[20];
934 pad_ct=(decoder->cipher_suite->dig==DIG_SHA)?40:48;
936 /* get cipher used for digest comptuation */
937 md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
938 ssl_debug_printf("ssl3_check_mac digest%s md %d\n",
939 digests[decoder->cipher_suite->dig-0x40], md);
940 memset(&mc, 0, sizeof(mc));
942 ssl_debug_printf("ssl3_check_mac memory digest %p\n",mc);
944 /* do hash computation on data && padding */
945 ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
947 memset(buf,0x36,pad_ct);
948 ssl_md_update(&mc,buf,pad_ct);
950 fmt_seq(decoder->seq,buf);
952 ssl_md_update(&mc,buf,8);
955 ssl_md_update(&mc,buf,1);
959 ssl_md_update(&mc,buf,2);
960 ssl_md_update(&mc,data,datalen);
962 ssl_md_final(&mc,dgst,&l);
966 ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
968 memset(buf,0x5c,pad_ct);
969 ssl_md_update(&mc,buf,pad_ct);
970 ssl_md_update(&mc,dgst,l);
972 ssl_md_final(&mc,dgst,&l);
974 if(memcmp(mac,dgst,l))
981 ssl_decrypt_record(SslDecryptSession*ssl,SslDecoder* decoder, int ct,
982 const unsigned char* in, int inl,unsigned char*out,int* outl)
987 ssl_debug_printf("ssl_decrypt_record ciphertext len %d\n", inl);
988 ssl_print_data("Ciphertext",in, inl);
991 if ((pad = ssl_cipher_decrypt(&decoder->evp,out,*outl,in,inl))!= 0)
992 ssl_debug_printf("ssl_decrypt_record: %s %s\n", gcry_strsource (pad),
993 gcry_strerror (pad));
995 ssl_print_data("Plaintext",out,inl);
998 /* Now strip off the padding*/
999 if(decoder->cipher_suite->block!=1){
1002 ssl_debug_printf("ssl_decrypt_record found padding %d final len %d\n",
1007 worklen-=decoder->cipher_suite->dig_len;
1010 ssl_debug_printf("ssl_decrypt_record wrong record len/padding outlen %d\n work %d\n",*outl, worklen);
1014 /*ssl_print_data("Record data",out,*outl);*/
1016 /* Now check the MAC */
1017 ssl_debug_printf("checking mac (len %d, version %X, ct %d)\n", worklen,ssl->version_netorder, ct);
1018 if(ssl->version_netorder==0x300){
1019 if(ssl3_check_mac(decoder,ct,out,worklen,mac) < 0) {
1020 ssl_debug_printf("ssl_decrypt_record: mac falied\n");
1025 if(tls_check_mac(decoder,ct,ssl->version_netorder,out,worklen,mac)< 0) {
1026 ssl_debug_printf("ssl_decrypt_record: mac falied\n");
1030 ssl_debug_printf("ssl_decrypt_record: mac ok\n");
1035 /* old relase of gnutls does not define the appropriate macros, so get
1036 * them from the string*/
1038 ssl_get_version(int* major, int* minor, int* patch)
1040 const char* str = gnutls_check_version(NULL);
1042 ssl_debug_printf("ssl_get_version: %s\n", str);
1043 sscanf(str, "%d.%d.%d", major, minor, patch);
1048 ssl_load_key(FILE* fp)
1050 /* gnutls make our work much harded, since we have to work internally with
1051 * s-exp formatted data, but PEM loader export only in "gnutls_datum"
1052 * format, and a datum -> s-exp convertion function does not exist.
1054 struct gnutls_x509_privkey_int* priv_key;
1056 gnutls_datum m, e, d, p,q, u;
1057 int size, major, minor, patch;
1059 unsigned int tmp_size;
1061 gcry_mpi_t* rsa_params = g_malloc(sizeof(gcry_mpi_t)*6);
1063 gcry_mpi_t rsa_params[6];
1065 gcry_sexp_t rsa_priv_key;
1067 /* init private key data*/
1068 gnutls_x509_privkey_init(&priv_key);
1070 /* compute file size and load all file contents into a datum buffer*/
1071 if (fseek(fp, 0, SEEK_END) < 0) {
1072 ssl_debug_printf("ssl_load_key: can't fseek file\n");
1075 if ((size = ftell(fp)) < 0) {
1076 ssl_debug_printf("ssl_load_key: can't ftell file\n");
1079 if (fseek(fp, 0, SEEK_SET) < 0) {
1080 ssl_debug_printf("ssl_load_key: can't refseek file\n");
1083 key.data = g_malloc(size);
1085 bytes = fread(key.data, 1, key.size, fp);
1086 if (bytes < key.size) {
1087 ssl_debug_printf("ssl_load_key: can't read from file %d bytes, got %d\n",
1092 /* import PEM data*/
1093 if (gnutls_x509_privkey_import(priv_key, &key, GNUTLS_X509_FMT_PEM)!=0) {
1094 ssl_debug_printf("ssl_load_key: can't import pem data\n");
1099 /* RSA get parameter */
1100 if (gnutls_x509_privkey_export_rsa_raw(priv_key, &m, &e, &d, &p, &q, &u) != 0) {
1101 ssl_debug_printf("ssl_load_key: can't export rsa param (is a rsa private key file ?!?)\n");
1105 /* convert each rsa parameter to mpi format*/
1106 if (gcry_mpi_scan( &rsa_params[0], GCRYMPI_FMT_USG, m.data, m.size, &tmp_size) !=0) {
1107 ssl_debug_printf("ssl_load_key: can't convert m rsa param to int (size %d)\n", m.size);
1111 if (gcry_mpi_scan( &rsa_params[1], GCRYMPI_FMT_USG, e.data, e.size, &tmp_size) != 0) {
1112 ssl_debug_printf("ssl_load_key: can't convert e rsa param to int (size %d)\n", e.size);
1117 * note: openssl and gnutls use 'p' and 'q' with opposite meaning:
1118 * our 'p' must be equal to 'q' as provided from openssl and viceversa
1120 if (gcry_mpi_scan( &rsa_params[2], GCRYMPI_FMT_USG, d.data, d.size, &tmp_size) !=0) {
1121 ssl_debug_printf("ssl_load_key: can't convert d rsa param to int (size %d)\n", d.size);
1125 if (gcry_mpi_scan( &rsa_params[3], GCRYMPI_FMT_USG, q.data, q.size, &tmp_size) !=0) {
1126 ssl_debug_printf("ssl_load_key: can't convert q rsa param to int (size %d)\n", q.size);
1130 if (gcry_mpi_scan( &rsa_params[4], GCRYMPI_FMT_USG, p.data, p.size, &tmp_size) !=0) {
1131 ssl_debug_printf("ssl_load_key: can't convert p rsa param to int (size %d)\n", p.size);
1135 if (gcry_mpi_scan( &rsa_params[5], GCRYMPI_FMT_USG, u.data, u.size, &tmp_size) !=0) {
1136 ssl_debug_printf("ssl_load_key: can't convert u rsa param to int (size %d)\n", m.size);
1140 ssl_get_version(&major, &minor, &patch);
1142 /* certain versions of gnutls require swap of rsa params 'p' and 'q' */
1143 if ((major <= 1) && (minor <= 0) && (patch <=13))
1146 ssl_debug_printf("ssl_load_key: swapping p and q parametes\n");
1147 tmp = rsa_params[4];
1148 rsa_params[4] = rsa_params[3];
1149 rsa_params[3] = tmp;
1152 if (gcry_sexp_build( &rsa_priv_key, NULL,
1153 "(private-key(rsa((n%m)(e%m)(d%m)(p%m)(q%m)(u%m))))", rsa_params[0],
1154 rsa_params[1], rsa_params[2], rsa_params[3], rsa_params[4],
1155 rsa_params[5]) != 0) {
1156 ssl_debug_printf("ssl_load_key: can't built rsa private key s-exp\n");
1165 for (i=0; i< 6; i++)
1166 gcry_mpi_release(rsa_params[i]);
1168 return rsa_priv_key;
1172 void ssl_free_key(SSL_PRIVATE_KEY* key)
1176 for (i=0; i< 6; i++)
1177 gcry_mpi_release(key[i]);
1179 gcry_sexp_release(key);
1183 #ifdef SSL_DECRYPT_DEBUG
1184 static FILE* myout=NULL;
1189 gnutls_global_init();
1191 #ifdef SSL_DECRYPT_DEBUG
1193 /* we don't have standard I/O file available, open a log */
1194 myout = fopen("ssl-decrypt.txt","w");
1198 #endif /* SSL_DECRYPT_DEBUG */
1201 #else /* HAVE_LIBGNUTLS */
1202 /* no libgnutl: dummy operation to keep interface consistent*/
1209 ssl_load_key(FILE* fp)
1211 ssl_debug_printf("ssl_load_key: impossible without glutls. fp %p\n",fp);
1216 ssl_free_key(SSL_PRIVATE_KEY* key _U_)
1221 ssl_find_cipher(int num,SslCipherSuite* cs)
1223 ssl_debug_printf("ssl_find_cipher: dummy without glutls. num %d cs %p\n",
1228 ssl_generate_keyring_material(SslDecryptSession*ssl)
1230 ssl_debug_printf("ssl_generate_keyring_material: impossible without glutls. ssl %p\n",
1235 ssl_decrypt_pre_master_secret(SslDecryptSession* ssl_session,
1236 StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
1238 ssl_debug_printf("ssl_decrypt_pre_master_secret: impossible without glutls."
1239 " ssl %p entrypted_pre_master %p pk %p\n", ssl_session,
1240 entrypted_pre_master, pk);
1245 ssl_decrypt_record(SslDecryptSession*ssl,SslDecoder* decoder, int ct,
1246 const unsigned char* in, int inl,unsigned char*out,int* outl)
1248 ssl_debug_printf("ssl_decrypt_record: impossible without gnutls. ssl %p"
1249 "decoder %p ct %d, in %p inl %d out %p outl %p\n", ssl, decoder, ct,
1250 in, inl, out, outl);
1254 #endif /* HAVE_LIBGNUTLS */
1256 /* get ssl data for this session. if no ssl data is found allocate a new one*/
1258 ssl_session_init(SslDecryptSession* ssl_session)
1260 ssl_debug_printf("ssl_session_init: initializing ptr %p size %lu\n",
1261 ssl_session, (unsigned long)sizeof(SslDecryptSession));
1263 ssl_session->master_secret.data = ssl_session->_master_secret;
1264 ssl_session->session_id.data = ssl_session->_session_id;
1265 ssl_session->client_random.data = ssl_session->_client_random;
1266 ssl_session->server_random.data = ssl_session->_server_random;
1267 ssl_session->master_secret.data_len = 48;
1270 #ifdef SSL_DECRYPT_DEBUG
1272 ssl_debug_printf(const char* fmt, ...)
1277 ret += vfprintf(myout, fmt, ap);
1283 ssl_print_text_data(const char* name, const unsigned char* data, int len)
1286 fprintf(myout,"%s: ",name);
1287 for (i=0; i< len; i++) {
1288 fprintf(myout,"%c",data[i]);
1290 fprintf(myout,"\n");
1295 ssl_print_data(const char* name, const unsigned char* data, int len)
1298 fprintf(myout,"%s[%d]:\n",name, len);
1299 for (i=0; i< len; i++) {
1300 if ((i>0) && (i%16 == 0))
1301 fprintf(myout,"\n");
1302 fprintf(myout,"%.2x ",data[i]&255);
1304 fprintf(myout,"\n");
1309 ssl_print_string(const char* name, const StringInfo* data)
1311 ssl_print_data(name, data->data, data->data_len);
1313 #endif /* SSL_DECRYPT_DEBUG */