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"
32 #include <epan/emem.h>
34 static gint ver_major, ver_minor, ver_patch;
37 ssl_data_set(StringInfo* str, const guchar* data, guint len)
39 memcpy(str->data, data, len);
45 /* hmac abstraction layer */
46 #define SSL_HMAC gcry_md_hd_t
49 ssl_hmac_init(SSL_HMAC* md, const void * key, gint len, gint algo)
51 gcry_md_open(md,algo, GCRY_MD_FLAG_HMAC);
52 gcry_md_setkey (*(md), key, len);
55 ssl_hmac_update(SSL_HMAC* md, const void* data, gint len)
57 gcry_md_write(*(md), data, len);
60 ssl_hmac_final(SSL_HMAC* md, guchar* data, guint* datalen)
64 algo = gcry_md_get_algo (*(md));
65 len = gcry_md_get_algo_dlen(algo);
66 memcpy(data, gcry_md_read(*(md), algo), len);
70 ssl_hmac_cleanup(SSL_HMAC* md)
75 /* memory digest abstraction layer*/
76 #define SSL_MD gcry_md_hd_t
79 ssl_md_init(SSL_MD* md, gint algo)
81 gcry_md_open(md,algo, 0);
84 ssl_md_update(SSL_MD* md, guchar* data, gint len)
86 gcry_md_write(*(md), data, len);
89 ssl_md_final(SSL_MD* md, guchar* data, guint* datalen)
93 algo = gcry_md_get_algo (*(md));
94 len = gcry_md_get_algo_dlen (algo);
95 memcpy(data, gcry_md_read(*(md), algo), len);
99 ssl_md_cleanup(SSL_MD* md)
101 gcry_md_close(*(md));
104 /* md5 /sha abstraction layer */
105 #define SSL_SHA_CTX gcry_md_hd_t
106 #define SSL_MD5_CTX gcry_md_hd_t
109 ssl_sha_init(SSL_SHA_CTX* md)
111 gcry_md_open(md,GCRY_MD_SHA1, 0);
114 ssl_sha_update(SSL_SHA_CTX* md, guchar* data, gint len)
116 gcry_md_write(*(md), data, len);
119 ssl_sha_final(guchar* buf, SSL_SHA_CTX* md)
121 memcpy(buf, gcry_md_read(*(md), GCRY_MD_SHA1),
122 gcry_md_get_algo_dlen(GCRY_MD_SHA1));
125 ssl_sha_cleanup(SSL_SHA_CTX* md)
127 gcry_md_close(*(md));
131 ssl_md5_init(SSL_MD5_CTX* md)
133 return gcry_md_open(md,GCRY_MD_MD5, 0);
136 ssl_md5_update(SSL_MD5_CTX* md, guchar* data, gint len)
138 gcry_md_write(*(md), data, len);
141 ssl_md5_final(guchar* buf, SSL_MD5_CTX* md)
143 memcpy(buf, gcry_md_read(*(md), GCRY_MD_MD5),
144 gcry_md_get_algo_dlen(GCRY_MD_MD5));
147 ssl_md5_cleanup(SSL_MD5_CTX* md)
149 gcry_md_close(*(md));
153 ssl_cipher_setiv(SSL_CIPHER_CTX *cipher, guchar* iv, gint iv_len)
160 c=(gcry_cipher_hd_t)*cipher;
162 ssl_debug_printf("--------------------------------------------------------------------");
163 /*for(ivp=c->iv,i=0; i < iv_len; i++ )
165 ssl_debug_printf("%d ",ivp[i]);
169 ssl_debug_printf("--------------------------------------------------------------------");
170 ret = gcry_cipher_setiv(*(cipher), iv, iv_len);
171 /*for(ivp=c->iv,i=0; i < iv_len; i++ )
173 ssl_debug_printf("%d ",ivp[i]);
177 ssl_debug_printf("--------------------------------------------------------------------");
180 /* stream cipher abstraction layer*/
182 ssl_cipher_init(gcry_cipher_hd_t *cipher, gint algo, guchar* sk,
183 guchar* iv, gint mode)
185 gint gcry_modes[]={GCRY_CIPHER_MODE_STREAM,GCRY_CIPHER_MODE_CBC};
187 err = gcry_cipher_open(cipher, algo, gcry_modes[mode], 0);
190 err = gcry_cipher_setkey(*(cipher), sk, gcry_cipher_get_algo_keylen (algo));
193 err = gcry_cipher_setiv(*(cipher), iv, gcry_cipher_get_algo_blklen (algo));
199 ssl_cipher_decrypt(gcry_cipher_hd_t *cipher, guchar * out, gint outl,
200 const guchar * in, gint inl)
202 return gcry_cipher_decrypt ( *(cipher), out, outl, in, inl);
205 ssl_get_digest_by_name(const gchar*name)
207 return gcry_md_map_name(name);
210 ssl_get_cipher_by_name(const gchar* name)
212 return gcry_cipher_map_name(name);
216 ssl_cipher_cleanup(gcry_cipher_hd_t *cipher)
218 gcry_cipher_close(*cipher);
222 /* private key abstraction layer */
224 ssl_get_key_len(SSL_PRIVATE_KEY* pk) {return gcry_pk_get_nbits (pk); }
227 _gcry_rsa_decrypt (int algo, gcry_mpi_t *result, gcry_mpi_t *data,
228 gcry_mpi_t *skey, gint flags);
230 #define PUBKEY_FLAG_NO_BLINDING (1 << 0)
232 /* decrypt data with private key. Store decrypted data directly into input
235 ssl_private_decrypt(guint len, guchar* encr_data, SSL_PRIVATE_KEY* pk)
239 gcry_sexp_t s_data, s_plain;
242 guchar* decr_data_ptr;
247 /* build up a mpi rappresentation for encrypted data */
248 rc = gcry_mpi_scan(&encr_mpi, GCRYMPI_FMT_USG,encr_data, encr_len, &encr_len);
250 ssl_debug_printf("pcry_private_decrypt: can't convert encr_data to mpi (size %d):%s\n",
251 len, gcry_strerror(rc));
256 /* put the data into a simple list */
257 rc = gcry_sexp_build(&s_data, NULL, "(enc-val(rsa(a%m)))", encr_mpi);
259 ssl_debug_printf("pcry_private_decrypt: can't build encr_sexp:%s \n",
264 /* pass it to libgcrypt */
265 rc = gcry_pk_decrypt(&s_plain, s_data, pk);
266 gcry_sexp_release(s_data);
269 ssl_debug_printf("pcry_private_decrypt: can't decrypt key:%s\n",
274 /* convert plain text sexp to mpi format */
275 text = gcry_sexp_nth_mpi(s_plain, 0, 0);
277 /* compute size requested for plaintext buffer */
279 if (gcry_mpi_print(GCRYMPI_FMT_USG, NULL, decr_len, &decr_len, text) != 0) {
280 ssl_debug_printf("pcry_private_decrypt: can't compute decr size:%s\n",
286 /* sanity check on out buffer */
287 if (decr_len > len) {
288 ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
293 /* write plain text to encrypted data buffer */
294 decr_data_ptr = encr_data;
295 if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
297 ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
298 decr_len, gcry_strerror(rc));
299 g_free(decr_data_ptr);
304 /* strip the padding*/
306 for (i = 1; i < decr_len; i++) {
307 if (decr_data_ptr[i] == 0) {
313 ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
315 ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
316 g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
320 gcry_sexp_release(s_plain);
322 rc = _gcry_rsa_decrypt(0, &text, &encr_mpi, pk,0);
323 gcry_mpi_print( GCRYMPI_FMT_USG, 0, 0, &decr_len, text);
325 /* sanity check on out buffer */
326 if (decr_len > len) {
327 ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
332 /* write plain text to newly allocated buffer */
333 decr_data_ptr = encr_data;
334 if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
336 ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
337 decr_len, gcry_strerror(rc));
341 /* strip the padding*/
343 for (i = 1; i < decr_len; i++) {
344 if (decr_data_ptr[i] == 0) {
350 ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
352 ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
353 g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
355 #endif /* SSL_FAST */
356 gcry_mpi_release(text);
360 /* stringinfo interface */
362 ssl_data_alloc(StringInfo* str, guint len)
364 str->data = g_malloc(len);
371 #define PRF(ssl,secret,usage,rnd1,rnd2,out) ((ssl->version_netorder==SSLV3_VERSION)? \
372 ssl3_prf(secret,usage,rnd1,rnd2,out): \
373 tls_prf(secret,usage,rnd1,rnd2,out))
375 static const gchar *digests[]={
380 static const gchar *ciphers[]={
383 "ARCFOUR", /* gnutls does not support rc4, but this should be 100% compatible*/
391 /* look in openssl/ssl/ssl_lib.c for a complete list of available cipersuite*/
392 static SslCipherSuite cipher_suites[]={
393 {1,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
394 {2,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
395 {3,KEX_RSA,SIG_RSA,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
396 {4,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
397 {5,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
398 {6,KEX_RSA,SIG_RSA,ENC_RC2,8,128,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
399 {7,KEX_RSA,SIG_RSA,ENC_IDEA,8,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
400 {8,KEX_RSA,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_CBC},
401 {9,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
402 {10,KEX_RSA,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
403 {11,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
404 {12,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
405 {13,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
406 {14,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
407 {15,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
408 {16,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
409 {17,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
410 {18,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
411 {19,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
412 {20,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
413 {21,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
414 {22,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
415 {23,KEX_DH,SIG_NONE,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
416 {24,KEX_DH,SIG_NONE,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
417 {25,KEX_DH,SIG_NONE,ENC_DES,8,64,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
418 {26,KEX_DH,SIG_NONE,ENC_DES,8,64,64,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
419 {27,KEX_DH,SIG_NONE,ENC_3DES,8,192,192,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
420 {47,KEX_RSA,SIG_RSA,ENC_AES,16,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
421 {53,KEX_RSA,SIG_RSA,ENC_AES256,16,256,256,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
422 {96,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
423 {97,KEX_RSA,SIG_RSA,ENC_RC2,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
424 {98,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
425 {99,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,16,1, SSL_CIPHER_MODE_STREAM},
426 {100,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
427 {101,KEX_DH,SIG_DSS,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
428 {102,KEX_DH,SIG_DSS,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
429 {-1, 0,0,0,0,0,0,0,0,0, 0}
432 #define MAX_BLOCK_SIZE 16
433 #define MAX_KEY_SIZE 32
436 ssl_find_cipher(int num,SslCipherSuite* cs)
440 for(c=cipher_suites;c->number!=-1;c++){
451 tls_hash(StringInfo* secret,
452 StringInfo* seed, gint md, StringInfo* out)
458 guint8 _A[20],tmp[20];
465 ssl_print_string("tls_hash: hash secret", secret);
466 ssl_print_string("tls_hash: hash seed", seed);
471 ssl_hmac_init(&hm,secret->data,secret->data_len,md);
472 ssl_hmac_update(&hm,A,A_l);
473 ssl_hmac_final(&hm,_A,&A_l);
474 ssl_hmac_cleanup(&hm);
477 ssl_hmac_init(&hm,secret->data,secret->data_len,md);
478 ssl_hmac_update(&hm,A,A_l);
479 ssl_hmac_update(&hm,seed->data,seed->data_len);
480 ssl_hmac_final(&hm,tmp,&tmp_l);
481 ssl_hmac_cleanup(&hm);
483 tocpy=MIN(left,tmp_l);
484 memcpy(ptr,tmp,tocpy);
489 ssl_print_string("hash out", out);
494 tls_prf(StringInfo* secret, const gchar *usage,
495 StringInfo* rnd1, StringInfo* rnd2, StringInfo* out)
497 StringInfo seed, sha_out, md5_out;
503 usage_len = strlen(usage);
505 /* initalize buffer for sha, md5 random seed*/
506 if (ssl_data_alloc(&sha_out, MAX(out->data_len,20)) < 0)
508 if (ssl_data_alloc(&md5_out, MAX(out->data_len,16)) < 0)
510 if (ssl_data_alloc(&seed, usage_len+rnd1->data_len+rnd2->data_len) < 0)
514 memcpy(ptr,usage,usage_len); ptr+=usage_len;
515 memcpy(ptr,rnd1->data,rnd1->data_len); ptr+=rnd1->data_len;
516 memcpy(ptr,rnd2->data,rnd2->data_len); ptr+=rnd2->data_len;
518 /* initalize buffer for client/server seeds*/
519 s_l=secret->data_len/2 + secret->data_len%2;
520 if (ssl_data_alloc(&s1, s_l) < 0)
522 if (ssl_data_alloc(&s2, s_l) < 0)
525 memcpy(s1.data,secret->data,s_l);
526 memcpy(s2.data,secret->data + (secret->data_len - s_l),s_l);
528 ssl_debug_printf("tls_prf: tls_hash(md5 secret_len %d seed_len %d )\n", s1.data_len, seed.data_len);
529 if(tls_hash(&s1,&seed,ssl_get_digest_by_name("MD5"),&md5_out) != 0)
531 ssl_debug_printf("tls_prf: tls_hash(sha)\n");
532 if(tls_hash(&s2,&seed,ssl_get_digest_by_name("SHA1"),&sha_out) != 0)
535 for(i=0;i<out->data_len;i++)
536 out->data[i]=md5_out.data[i] ^ sha_out.data[i];
539 ssl_print_string("PRF out",out);
554 ssl3_generate_export_iv(StringInfo* r1,
555 StringInfo* r2, StringInfo* out)
561 ssl_md5_update(&md5,r1->data,r1->data_len);
562 ssl_md5_update(&md5,r2->data,r2->data_len);
563 ssl_md5_final(tmp,&md5);
564 ssl_md5_cleanup(&md5);
566 memcpy(out->data,tmp,out->data_len);
567 ssl_print_string("export iv", out);
573 ssl3_prf(StringInfo* secret, const gchar* usage,
575 StringInfo* r2,StringInfo* out)
579 StringInfo *rnd1,*rnd2;
586 for(off=0;off<out->data_len;off+=16){
591 ssl_debug_printf("ssl3_prf: sha1_hash(%d)\n",i);
592 /* A, BB, CCC, ... */
598 ssl_sha_update(&sha,buf,i);
599 ssl_sha_update(&sha,secret->data,secret->data_len);
601 if(!strcmp(usage,"client write key") || !strcmp(usage,"server write key")){
602 ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
603 ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
606 ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
607 ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
610 ssl_sha_final(buf,&sha);
611 ssl_sha_cleanup(&sha);
613 ssl_debug_printf("ssl3_prf: md5_hash(%d) datalen %d\n",i,
616 ssl_md5_update(&md5,secret->data,secret->data_len);
617 ssl_md5_update(&md5,buf,20);
618 ssl_md5_final(outbuf,&md5);
619 ssl_md5_cleanup(&md5);
621 tocpy=MIN(out->data_len-off,16);
622 memcpy(out->data+off,outbuf,tocpy);
629 ssl_create_decoder(SslDecoder *dec, SslCipherSuite *cipher_suite,
630 guint8 *mk, guint8 *sk, guint8 *iv)
634 /* Find the SSLeay cipher */
635 if(cipher_suite->enc!=ENC_NULL) {
636 ssl_debug_printf("ssl_create_decoder CIPHER: %s\n", ciphers[cipher_suite->enc-0x30]);
637 ciph=ssl_get_cipher_by_name(ciphers[cipher_suite->enc-0x30]);
640 ssl_debug_printf("ssl_create_decoder can't find cipher %s\n",
641 ciphers[(cipher_suite->enc-0x30) > 7 ? 7 : (cipher_suite->enc-0x30)]);
645 /* init mac buffer: mac storage is embedded into decoder struct to save a
646 memory allocation and waste samo more memory*/
647 dec->cipher_suite=cipher_suite;
648 dec->mac_key.data = dec->_mac_key;
649 ssl_data_set(&dec->mac_key, mk, cipher_suite->dig_len);
653 ssl_cipher_cleanup(&dec->evp);
655 if (ssl_cipher_init(&dec->evp,ciph,sk,iv,cipher_suite->mode) < 0) {
656 ssl_debug_printf("ssl_create_decoder: can't create cipher id:%d mode:%d\n",
657 ciph, cipher_suite->mode);
661 ssl_debug_printf("decoder initialized (digest len %d)\n", cipher_suite->dig_len);
666 ssl_generate_keyring_material(SslDecryptSession*ssl_session)
668 StringInfo key_block;
669 guint8 _iv_c[MAX_BLOCK_SIZE],_iv_s[MAX_BLOCK_SIZE];
670 guint8 _key_c[MAX_KEY_SIZE],_key_s[MAX_KEY_SIZE];
672 guint8 *ptr,*c_wk,*s_wk,*c_mk,*s_mk,*c_iv = _iv_c,*s_iv = _iv_s;
674 /* if master_key is not yet generate, create it now*/
675 if (!(ssl_session->state & SSL_MASTER_SECRET)) {
676 ssl_debug_printf("ssl_generate_keyring_material:PRF(pre_master_secret)\n");
677 if (PRF(ssl_session,&ssl_session->pre_master_secret,"master secret",
678 &ssl_session->client_random,
679 &ssl_session->server_random, &ssl_session->master_secret)) {
680 ssl_debug_printf("ssl_generate_keyring_material can't generate master_secret\n");
683 ssl_print_string("master secret",&ssl_session->master_secret);
686 /* Compute the key block. First figure out how much data we need*/
687 needed=ssl_session->cipher_suite.dig_len*2;
688 needed+=ssl_session->cipher_suite.bits / 4;
689 if(ssl_session->cipher_suite.block>1)
690 needed+=ssl_session->cipher_suite.block*2;
692 key_block.data_len = needed;
693 key_block.data = g_malloc(needed);
694 if (!key_block.data) {
695 ssl_debug_printf("ssl_generate_keyring_material can't allacate key_block\n");
698 ssl_debug_printf("ssl_generate_keyring_material sess key generation\n");
699 if (PRF(ssl_session,&ssl_session->master_secret,"key expansion",
700 &ssl_session->server_random,&ssl_session->client_random,
702 ssl_debug_printf("ssl_generate_keyring_material can't generate key_block\n");
705 ssl_print_string("key expansion", &key_block);
708 c_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
709 s_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
711 c_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
712 s_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
714 if(ssl_session->cipher_suite.block>1){
715 c_iv=ptr; ptr+=ssl_session->cipher_suite.block;
716 s_iv=ptr; ptr+=ssl_session->cipher_suite.block;
719 if(ssl_session->cipher_suite.export){
720 StringInfo iv_c,iv_s;
721 StringInfo key_c,key_s;
724 if(ssl_session->cipher_suite.block>1){
726 /* We only have room for MAX_BLOCK_SIZE bytes IVs, but that's
727 all we should need. This is a sanity check */
728 if(ssl_session->cipher_suite.block>MAX_BLOCK_SIZE) {
729 ssl_debug_printf("ssl_generate_keyring_material cipher suite block must be at most %d nut is %d\n",
730 MAX_BLOCK_SIZE, ssl_session->cipher_suite.block);
735 iv_c.data_len = ssl_session->cipher_suite.block;
737 iv_s.data_len = ssl_session->cipher_suite.block;
739 if(ssl_session->version_netorder==SSLV3_VERSION){
740 ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv\n");
741 if (ssl3_generate_export_iv(&ssl_session->client_random,
742 &ssl_session->server_random,&iv_c)) {
743 ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 client iv\n");
746 ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv(2)\n");
747 if (ssl3_generate_export_iv(&ssl_session->server_random,
748 &ssl_session->client_random,&iv_s)) {
749 ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 server iv\n");
754 guint8 _iv_block[MAX_BLOCK_SIZE * 2];
759 key_null.data = &_key_null;
760 key_null.data_len = 0;
762 iv_block.data = _iv_block;
763 iv_block.data_len = ssl_session->cipher_suite.block*2;
765 ssl_debug_printf("ssl_generate_keyring_material prf(iv_block)\n");
766 if(PRF(ssl_session,&key_null, "IV block",
767 &ssl_session->client_random,
768 &ssl_session->server_random,&iv_block)) {
769 ssl_debug_printf("ssl_generate_keyring_material can't generate tls31 iv block\n");
773 memcpy(_iv_c,iv_block.data,ssl_session->cipher_suite.block);
774 memcpy(_iv_s,iv_block.data+ssl_session->cipher_suite.block,
775 ssl_session->cipher_suite.block);
782 if (ssl_session->version_netorder==SSLV3_VERSION){
785 ssl_debug_printf("ssl_generate_keyring_material MD5(client_random)\n");
788 ssl_md5_update(&md5,c_wk,ssl_session->cipher_suite.eff_bits/8);
789 ssl_md5_update(&md5,ssl_session->client_random.data,
790 ssl_session->client_random.data_len);
791 ssl_md5_update(&md5,ssl_session->server_random.data,
792 ssl_session->server_random.data_len);
793 ssl_md5_final(_key_c,&md5);
794 ssl_md5_cleanup(&md5);
798 ssl_debug_printf("ssl_generate_keyring_material MD5(server_random)\n");
799 ssl_md5_update(&md5,s_wk,ssl_session->cipher_suite.eff_bits/8);
800 ssl_md5_update(&md5,ssl_session->server_random.data,
801 ssl_session->server_random.data_len);
802 ssl_md5_update(&md5,ssl_session->client_random.data,
803 ssl_session->client_random.data_len);
804 ssl_md5_final(_key_s,&md5);
805 ssl_md5_cleanup(&md5);
810 key_c.data_len = sizeof(_key_c);
812 key_s.data_len = sizeof(_key_s);
815 k.data_len = ssl_session->cipher_suite.eff_bits/8;
816 ssl_debug_printf("ssl_generate_keyring_material PRF(key_c)\n");
817 if (PRF(ssl_session,&k,"client write key",
818 &ssl_session->client_random,
819 &ssl_session->server_random, &key_c)) {
820 ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 server key \n");
826 k.data_len = ssl_session->cipher_suite.eff_bits/8;
827 ssl_debug_printf("ssl_generate_keyring_material PRF(key_s)\n");
828 if(PRF(ssl_session,&k,"server write key",
829 &ssl_session->client_random,
830 &ssl_session->server_random, &key_s)) {
831 ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 client key \n");
838 /* show key material info */
839 ssl_print_data("Client MAC key",c_mk,ssl_session->cipher_suite.dig_len);
840 ssl_print_data("Server MAC key",s_mk,ssl_session->cipher_suite.dig_len);
841 ssl_print_data("Client Write key",c_wk,ssl_session->cipher_suite.bits/8);
842 ssl_print_data("Server Write key",s_wk,ssl_session->cipher_suite.bits/8);
844 if(ssl_session->cipher_suite.block>1) {
845 ssl_print_data("Client Write IV",c_iv,ssl_session->cipher_suite.block);
846 ssl_print_data("Server Write IV",s_iv,ssl_session->cipher_suite.block);
849 ssl_print_data("Client Write IV",c_iv,8);
850 ssl_print_data("Server Write IV",s_iv,8);
853 /* create both client and server ciphers*/
854 ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(client)\n");
855 if (ssl_create_decoder(&ssl_session->client,
856 &ssl_session->cipher_suite,c_mk,c_wk,c_iv)) {
857 ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
860 ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(server)\n");
861 if (ssl_create_decoder(&ssl_session->server,
862 &ssl_session->cipher_suite,s_mk,s_wk,s_iv)) {
863 ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
867 ssl_debug_printf("ssl_generate_keyring_material client seq %d server seq %d\n",
868 ssl_session->client.seq, ssl_session->server.seq);
869 g_free(key_block.data);
873 g_free(key_block.data);
878 ssl_decrypt_pre_master_secret(SslDecryptSession*ssl_session,
879 StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
883 if(ssl_session->cipher_suite.kex!=KEX_RSA) {
884 ssl_debug_printf("ssl_decrypt_pre_master_secret key %d diferent from KEX_RSA(%d)\n",
885 ssl_session->cipher_suite.kex, KEX_RSA);
889 /* with tls key loading will fail if not rsa type, so no need to check*/
890 ssl_print_string("pre master encrypted",entrypted_pre_master);
891 ssl_debug_printf("ssl_decrypt_pre_master_secret:RSA_private_decrypt\n");
892 i=ssl_private_decrypt(entrypted_pre_master->data_len,
893 entrypted_pre_master->data, pk);
896 ssl_debug_printf("ssl_decrypt_pre_master_secret wrong "
897 "pre_master_secret lenght (%d, expected %d)\n", i, 48);
901 /* the decrypted data has been written into the pre_master key buffer */
902 ssl_session->pre_master_secret.data = entrypted_pre_master->data;
903 ssl_session->pre_master_secret.data_len=48;
904 ssl_print_string("pre master secret",&ssl_session->pre_master_secret);
906 /* Remove the master secret if it was there.
907 This force keying material regeneration in
908 case we're renegotiating */
909 ssl_session->state &= ~(SSL_MASTER_SECRET|SSL_HAVE_SESSION_KEY);
913 /* convert network byte order 32 byte number to right-aligned host byte order *
915 static gint fmt_seq(guint32 num, guint8* buf)
921 memcpy(buf+4,&netnum,4);
927 tls_check_mac(SslDecoder*decoder, gint ct, gint ver, guint8* data,
928 guint32 datalen, guint8* mac)
935 md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
936 ssl_debug_printf("tls_check_mac mac type:%s md %d\n",
937 digests[decoder->cipher_suite->dig-0x40], md);
939 ssl_hmac_init(&hm,decoder->mac_key.data,decoder->mac_key.data_len,md);
941 /* hash sequence number */
942 fmt_seq(decoder->seq,buf);
946 ssl_hmac_update(&hm,buf,8);
948 /* hash content type */
950 ssl_hmac_update(&hm,buf,1);
952 /* hash version,data lenght and data*/
953 *((gint16*)buf) = g_htons(ver);
954 ssl_hmac_update(&hm,buf,2);
956 *((gint16*)buf) = g_htons(datalen);
957 ssl_hmac_update(&hm,buf,2);
958 ssl_hmac_update(&hm,data,datalen);
960 /* get digest and digest len*/
961 ssl_hmac_final(&hm,buf,&len);
962 ssl_print_data("Mac", buf, len);
963 if(memcmp(mac,buf,len))
966 ssl_hmac_cleanup(&hm);
971 ssl3_check_mac(SslDecoder*decoder,int ct,guint8* data,
972 guint32 datalen, guint8* mac)
977 guint8 buf[64],dgst[20];
980 pad_ct=(decoder->cipher_suite->dig==DIG_SHA)?40:48;
982 /* get cipher used for digest comptuation */
983 md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
986 /* do hash computation on data && padding */
987 ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
990 memset(buf,0x36,pad_ct);
991 ssl_md_update(&mc,buf,pad_ct);
993 /* hash sequence number */
994 fmt_seq(decoder->seq,buf);
996 ssl_md_update(&mc,buf,8);
998 /* hash content type */
1000 ssl_md_update(&mc,buf,1);
1002 /* hash data lenght in network byte order and data*/
1003 *((gint16* )buf) = g_htons(datalen);
1004 ssl_md_update(&mc,buf,2);
1005 ssl_md_update(&mc,data,datalen);
1007 /* get partial digest */
1008 ssl_md_final(&mc,dgst,&len);
1009 ssl_md_cleanup(&mc);
1011 ssl_md_init(&mc,md);
1014 ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
1016 /* hash padding and partial digest*/
1017 memset(buf,0x5c,pad_ct);
1018 ssl_md_update(&mc,buf,pad_ct);
1019 ssl_md_update(&mc,dgst,len);
1021 ssl_md_final(&mc,dgst,&len);
1022 ssl_md_cleanup(&mc);
1024 if(memcmp(mac,dgst,len))
1032 dtls_check_mac(SslDecoder*decoder, gint ct,int ver, guint8* data,
1033 guint32 datalen, guint8* mac)
1040 md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
1041 ssl_debug_printf("dtls_check_mac mac type:%s md %d\n",
1042 digests[decoder->cipher_suite->dig-0x40], md);
1044 ssl_hmac_init(&hm,decoder->mac_key.data,decoder->mac_key.data_len,md);
1045 ssl_debug_printf("dtls_check_mac seq: %d epoch: %d\n",decoder->seq,decoder->epoch);
1046 /* hash sequence number */
1047 fmt_seq(decoder->seq,buf);
1048 buf[0]=decoder->epoch>>8;
1049 buf[1]=decoder->epoch;
1051 ssl_hmac_update(&hm,buf,8);
1053 /* hash content type */
1055 ssl_hmac_update(&hm,buf,1);
1057 /* hash version,data lenght and data */
1058 *((gint16*)buf) = g_htons(ver);
1059 ssl_hmac_update(&hm,buf,2);
1061 *((gint16*)buf) = g_htons(datalen);
1062 ssl_hmac_update(&hm,buf,2);
1063 ssl_hmac_update(&hm,data,datalen);
1064 /* get digest and digest len */
1065 ssl_hmac_final(&hm,buf,&len);
1066 ssl_print_data("Mac", buf, len);
1067 if(memcmp(mac,buf,len))
1070 ssl_hmac_cleanup(&hm);
1077 ssl_decrypt_record(SslDecryptSession*ssl,SslDecoder* decoder, gint ct,
1078 const guchar* in, gint inl, guchar*out, gint* outl)
1084 ssl_debug_printf("ssl_decrypt_record ciphertext len %d\n", inl);
1085 ssl_print_data("Ciphertext",in, inl);
1088 if ((pad = ssl_cipher_decrypt(&decoder->evp,out,*outl,in,inl))!= 0)
1089 ssl_debug_printf("ssl_decrypt_record: %s %s\n", gcry_strsource (pad),
1090 gcry_strerror (pad));
1092 ssl_print_data("Plaintext",out,inl);
1095 /* Now strip off the padding*/
1096 if(decoder->cipher_suite->block!=1){
1099 ssl_debug_printf("ssl_decrypt_record found padding %d final len %d\n",
1104 worklen-=decoder->cipher_suite->dig_len;
1107 ssl_debug_printf("ssl_decrypt_record wrong record len/padding outlen %d\n work %d\n",*outl, worklen);
1112 /* if TLS 1.1 we use the transmitted IV and remove it after (to not modify dissector in others parts)*/
1113 if(ssl->version_netorder==TLSV1DOT1_VERSION){
1114 worklen=worklen-decoder->cipher_suite->block;
1115 memcpy(out,out+decoder->cipher_suite->block,worklen);
1117 if(ssl->version_netorder==DTLSV1DOT0_VERSION){
1118 worklen=worklen-decoder->cipher_suite->block;
1119 memcpy(out,out+decoder->cipher_suite->block,worklen);
1121 /* Now check the MAC */
1122 ssl_debug_printf("checking mac (len %d, version %X, ct %d seq %d)\n",
1123 worklen, ssl->version_netorder, ct, decoder->seq);
1124 if(ssl->version_netorder==SSLV3_VERSION){
1125 if(ssl3_check_mac(decoder,ct,out,worklen,mac) < 0) {
1126 ssl_debug_printf("ssl_decrypt_record: mac failed\n");
1130 else if(ssl->version_netorder==TLSV1_VERSION || ssl->version_netorder==TLSV1DOT1_VERSION){
1131 if(tls_check_mac(decoder,ct,ssl->version_netorder,out,worklen,mac)< 0) {
1132 ssl_debug_printf("ssl_decrypt_record: mac failed\n");
1136 else if(ssl->version_netorder==DTLSV1DOT0_VERSION){
1137 /* follow the openssl dtls errors the rigth test is : dtls_check_mac(decoder,ct,ssl->version_netorder,out,worklen,mac)< 0 */
1138 if(tls_check_mac(decoder,ct,TLSV1_VERSION,out,worklen,mac)< 0) {
1139 ssl_debug_printf("ssl_decrypt_record: mac failed\n");
1143 ssl_debug_printf("ssl_decrypt_record: mac ok\n");
1149 ssl_get_version(gint* major, gint* minor, gint* patch)
1158 ssl_load_key(FILE* fp)
1160 /* gnutls make our work much harded, since we have to work internally with
1161 * s-exp formatted data, but PEM loader export only in "gnutls_datum"
1162 * format, and a datum -> s-exp convertion function does not exist.
1164 struct gnutls_x509_privkey_int* priv_key;
1166 gnutls_datum m, e, d, p,q, u;
1167 gint size, major, minor, patch;
1171 gcry_mpi_t* rsa_params = g_malloc(sizeof(gcry_mpi_t)*6);
1173 gcry_mpi_t rsa_params[6];
1175 gcry_sexp_t rsa_priv_key;
1177 /* init private key data*/
1178 gnutls_x509_privkey_init(&priv_key);
1180 /* compute file size and load all file contents into a datum buffer*/
1181 if (fseek(fp, 0, SEEK_END) < 0) {
1182 ssl_debug_printf("ssl_load_key: can't fseek file\n");
1185 if ((size = ftell(fp)) < 0) {
1186 ssl_debug_printf("ssl_load_key: can't ftell file\n");
1189 if (fseek(fp, 0, SEEK_SET) < 0) {
1190 ssl_debug_printf("ssl_load_key: can't refseek file\n");
1193 key.data = g_malloc(size);
1195 bytes = fread(key.data, 1, key.size, fp);
1196 if (bytes < key.size) {
1197 ssl_debug_printf("ssl_load_key: can't read from file %d bytes, got %d\n",
1202 /* import PEM data*/
1203 if (gnutls_x509_privkey_import(priv_key, &key, GNUTLS_X509_FMT_PEM)!=0) {
1204 ssl_debug_printf("ssl_load_key: can't import pem data\n");
1209 /* RSA get parameter */
1210 if (gnutls_x509_privkey_export_rsa_raw(priv_key, &m, &e, &d, &p, &q, &u) != 0) {
1211 ssl_debug_printf("ssl_load_key: can't export rsa param (is a rsa private key file ?!?)\n");
1215 /* convert each rsa parameter to mpi format*/
1216 if (gcry_mpi_scan( &rsa_params[0], GCRYMPI_FMT_USG, m.data, m.size, &tmp_size) !=0) {
1217 ssl_debug_printf("ssl_load_key: can't convert m rsa param to int (size %d)\n", m.size);
1221 if (gcry_mpi_scan( &rsa_params[1], GCRYMPI_FMT_USG, e.data, e.size, &tmp_size) != 0) {
1222 ssl_debug_printf("ssl_load_key: can't convert e rsa param to int (size %d)\n", e.size);
1227 * note: openssl and gnutls use 'p' and 'q' with opposite meaning:
1228 * our 'p' must be equal to 'q' as provided from openssl and viceversa
1230 if (gcry_mpi_scan( &rsa_params[2], GCRYMPI_FMT_USG, d.data, d.size, &tmp_size) !=0) {
1231 ssl_debug_printf("ssl_load_key: can't convert d rsa param to int (size %d)\n", d.size);
1235 if (gcry_mpi_scan( &rsa_params[3], GCRYMPI_FMT_USG, q.data, q.size, &tmp_size) !=0) {
1236 ssl_debug_printf("ssl_load_key: can't convert q rsa param to int (size %d)\n", q.size);
1240 if (gcry_mpi_scan( &rsa_params[4], GCRYMPI_FMT_USG, p.data, p.size, &tmp_size) !=0) {
1241 ssl_debug_printf("ssl_load_key: can't convert p rsa param to int (size %d)\n", p.size);
1245 if (gcry_mpi_scan( &rsa_params[5], GCRYMPI_FMT_USG, u.data, u.size, &tmp_size) !=0) {
1246 ssl_debug_printf("ssl_load_key: can't convert u rsa param to int (size %d)\n", m.size);
1250 ssl_get_version(&major, &minor, &patch);
1252 /* certain versions of gnutls require swap of rsa params 'p' and 'q' */
1253 if ((major <= 1) && (minor <= 0) && (patch <=13))
1256 ssl_debug_printf("ssl_load_key: swapping p and q parametes\n");
1257 tmp = rsa_params[4];
1258 rsa_params[4] = rsa_params[3];
1259 rsa_params[3] = tmp;
1262 if (gcry_sexp_build( &rsa_priv_key, NULL,
1263 "(private-key(rsa((n%m)(e%m)(d%m)(p%m)(q%m)(u%m))))", rsa_params[0],
1264 rsa_params[1], rsa_params[2], rsa_params[3], rsa_params[4],
1265 rsa_params[5]) != 0) {
1266 ssl_debug_printf("ssl_load_key: can't built rsa private key s-exp\n");
1275 for (i=0; i< 6; i++)
1276 gcry_mpi_release(rsa_params[i]);
1278 return rsa_priv_key;
1282 void ssl_free_key(SSL_PRIVATE_KEY* key)
1286 for (i=0; i< 6; i++)
1287 gcry_mpi_release(key[i]);
1289 gcry_sexp_release(key);
1296 const gchar* str = gnutls_check_version(NULL);
1298 /* get library version */
1299 /* old relase of gnutls does not define the appropriate macros, so get
1300 * them from the string*/
1301 ssl_debug_printf("gnutls version: %s\n", str);
1302 sscanf(str, "%d.%d.%d", &ver_major, &ver_minor, &ver_patch);
1305 #else /* HAVE_LIBGNUTLS */
1306 /* no libgnutl: dummy operation to keep interface consistent*/
1313 ssl_load_key(FILE* fp)
1315 ssl_debug_printf("ssl_load_key: impossible without glutls. fp %p\n",fp);
1320 ssl_free_key(SSL_PRIVATE_KEY* key _U_)
1325 ssl_find_cipher(int num,SslCipherSuite* cs)
1327 ssl_debug_printf("ssl_find_cipher: dummy without glutls. num %d cs %p\n",
1332 ssl_generate_keyring_material(SslDecryptSession*ssl)
1334 ssl_debug_printf("ssl_generate_keyring_material: impossible without glutls. ssl %p\n",
1339 ssl_decrypt_pre_master_secret(SslDecryptSession* ssl_session,
1340 StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
1342 ssl_debug_printf("ssl_decrypt_pre_master_secret: impossible without glutls."
1343 " ssl %p entrypted_pre_master %p pk %p\n", ssl_session,
1344 entrypted_pre_master, pk);
1349 ssl_decrypt_record(SslDecryptSession*ssl, SslDecoder* decoder, gint ct,
1350 const guchar* in, gint inl, guchar*out, gint* outl)
1352 ssl_debug_printf("ssl_decrypt_record: impossible without gnutls. ssl %p"
1353 "decoder %p ct %d, in %p inl %d out %p outl %p\n", ssl, decoder, ct,
1354 in, inl, out, outl);
1359 ssl_cipher_setiv(SSL_CIPHER_CTX *cipher, guchar* iv, gint iv_len)
1361 ssl_debug_printf("ssl_cipher_setiv: impossible without glutls.\n");
1365 #endif /* HAVE_LIBGNUTLS */
1367 /* get ssl data for this session. if no ssl data is found allocate a new one*/
1369 ssl_session_init(SslDecryptSession* ssl_session)
1371 ssl_debug_printf("ssl_session_init: initializing ptr %p size %lu\n",
1372 ssl_session, (gulong)sizeof(SslDecryptSession));
1374 ssl_session->master_secret.data = ssl_session->_master_secret;
1375 ssl_session->session_id.data = ssl_session->_session_id;
1376 ssl_session->client_random.data = ssl_session->_client_random;
1377 ssl_session->server_random.data = ssl_session->_server_random;
1378 ssl_session->master_secret.data_len = 48;
1379 ssl_session->server_data_for_iv.data = 0;
1380 ssl_session->server_data_for_iv.data = ssl_session->_server_data_for_iv;
1381 ssl_session->client_data_for_iv.data = 0;
1382 ssl_session->client_data_for_iv.data = ssl_session->_client_data_for_iv;
1383 ssl_session->app_data_segment.data=NULL;
1384 ssl_session->app_data_segment.data_len=0;
1387 /* Hash Functions for TLS/DTLS sessions table and private keys table*/
1389 ssl_equal (gconstpointer v, gconstpointer v2)
1391 const StringInfo *val1;
1392 const StringInfo *val2;
1393 val1 = (const StringInfo *)v;
1394 val2 = (const StringInfo *)v2;
1396 if (val1->data_len == val2->data_len &&
1397 !memcmp(val1->data, val2->data, val2->data_len)) {
1404 ssl_hash (gconstpointer v)
1410 id = (StringInfo*) v;
1411 cur = (guint*) id->data;
1413 for (l=4; (l<id->data_len); l+=4, cur++)
1414 hash = hash ^ (*cur);
1420 ssl_private_key_equal (gconstpointer v, gconstpointer v2)
1422 const SslService *val1;
1423 const SslService *val2;
1424 val1 = (const SslService *)v;
1425 val2 = (const SslService *)v2;
1427 if ((val1->port == val2->port) &&
1428 ! CMP_ADDRESS(&val1->addr, &val2->addr)) {
1435 ssl_private_key_hash (gconstpointer v)
1437 const SslService *key;
1438 guint l, hash, len ;
1440 key = (const SslService *)v;
1442 len = key->addr.len;
1443 cur = (guint*) key->addr.data;
1445 for (l=4; (l<len); l+=4, cur++)
1446 hash = hash ^ (*cur);
1451 /* private key table entries have a scope 'larger' then packet capture,
1452 * so we can't relay on se_alloc** function */
1454 ssl_private_key_free(gpointer id, gpointer key, gpointer dummy _U_)
1457 ssl_free_key((SSL_PRIVATE_KEY*) key);
1460 /* handling of association between tls/dtls ports and clear text protocol */
1462 ssl_association_add(GTree* associations, dissector_handle_t handle, guint port, const gchar *protocol, gboolean tcp, gboolean from_key_list)
1465 SslAssociation* assoc;
1466 assoc = g_malloc(sizeof(SslAssociation));
1469 assoc->ssl_port = port;
1470 assoc->info=g_malloc(strlen(protocol)+1);
1471 strcpy(assoc->info, protocol);
1472 assoc->handle = find_dissector(protocol);
1473 assoc->from_key_list = from_key_list;
1475 ssl_debug_printf("association_add %s port %d protocol %s handle %p\n",
1476 (assoc->tcp)?"TCP":"UDP", port, protocol, assoc->handle);
1479 if (!assoc->handle) {
1480 ssl_debug_printf("association_add could not find handle for protocol '%s', try to find 'data' dissector\n", protocol);
1481 assoc->handle = find_dissector("data");
1485 fprintf(stderr, "association_add() could not find handle for protocol:%s\n",protocol);
1488 dissector_add("tcp.port", port, handle);
1490 dissector_add("udp.port", port, handle);
1491 g_tree_insert(associations, assoc, assoc);
1496 ssl_association_remove(GTree* associations, SslAssociation *assoc)
1498 ssl_debug_printf("ssl_association_remove removing %s %u - %s handle %p\n",
1499 (assoc->tcp)?"TCP":"UDP", assoc->ssl_port, assoc->info, assoc->handle);
1501 dissector_delete((assoc->tcp)?"tcp.port":"udp.port", assoc->ssl_port, assoc->handle);
1503 g_tree_remove(associations, assoc);
1508 ssl_association_cmp(gconstpointer a, gconstpointer b)
1510 const SslAssociation *assoc_a=a, *assoc_b=b;
1511 if (assoc_a->tcp != assoc_b->tcp) return (assoc_a->tcp)?1:-1;
1512 return assoc_a->ssl_port - assoc_b->ssl_port;
1516 ssl_association_find(GTree * associations, guint port, gboolean tcp)
1518 register SslAssociation* ret;
1519 SslAssociation assoc_tmp;
1521 assoc_tmp.tcp = tcp;
1522 assoc_tmp.ssl_port = port;
1523 ret = g_tree_lookup(associations, &assoc_tmp);
1525 ssl_debug_printf("association_find: %s port %d found %p\n", (tcp)?"TCP":"UDP", port, ret);
1530 ssl_assoc_from_key_list(gpointer key _U_, gpointer data, gpointer user_data)
1532 if (((SslAssociation*)data)->from_key_list)
1533 ep_stack_push((ep_stack_t)user_data, data);
1538 ssl_packet_from_server(GTree* associations, guint port, gboolean tcp)
1541 ret = ssl_association_find(associations, port, tcp) != 0;
1543 ssl_debug_printf("packet_from_server: is from server %d\n", ret);
1547 /* add to packet data a newly allocated tvb with the specified real data*/
1549 ssl_add_record_info(gint proto, packet_info *pinfo, guchar* data, gint data_len, gint record_id)
1554 real_data = se_alloc(data_len);
1555 rec = se_alloc(sizeof(SslRecordInfo));
1556 pi = p_get_proto_data(pinfo->fd, proto);
1560 pi = se_alloc0(sizeof(SslPacketInfo));
1561 p_add_proto_data(pinfo->fd, proto,pi);
1564 rec->id = record_id;
1565 rec->tvb = tvb_new_real_data(real_data, data_len, data_len);
1566 memcpy(real_data, data, data_len);
1568 /* head insertion */
1569 rec->next= pi->handshake_data;
1570 pi->handshake_data = rec;
1574 /* search in packet data the tvbuff associated to the specified id */
1576 ssl_get_record_info(int proto, packet_info *pinfo, gint record_id)
1580 pi = p_get_proto_data(pinfo->fd, proto);
1585 for (rec = pi->handshake_data; rec; rec = rec->next)
1586 if (rec->id == record_id)
1592 /* initialize/reset per capture state data (ssl sessions cache) */
1594 ssl_common_init(GHashTable **session_hash , StringInfo * decrypted_data)
1597 g_hash_table_destroy(*session_hash);
1598 *session_hash = g_hash_table_new(ssl_hash, ssl_equal);
1599 if (decrypted_data->data)
1600 g_free(decrypted_data->data);
1601 decrypted_data->data = g_malloc0(32);
1602 decrypted_data->data_len = 32;
1605 /* parse ssl related preferences (private keys and ports association strings) */
1607 ssl_parse_key_list(const gchar * keys_list, GHashTable *key_hash, GTree* associations, dissector_handle_t handle, gboolean tcp)
1613 SslService* service;
1614 SSL_PRIVATE_KEY * private_key;
1617 start = strdup(keys_list);
1619 ssl_debug_printf("ssl_init keys string:\n%s\n", start);
1621 gchar* addr, *port, *protocol, *filename;
1624 /* split ip/file couple with ';' separator*/
1625 end = strpbrk(start, ";\n\r");
1631 /* skip comments (in file) */
1632 if (addr[0] == '#') continue;
1634 /* for each entry split ip, port, protocol, filename with ',' separator */
1635 ssl_debug_printf("ssl_init found host entry %s\n", addr);
1636 port = strchr(addr, ',');
1639 ssl_debug_printf("ssl_init entry malformed can't find port in '%s'\n", addr);
1645 protocol = strchr(port,',');
1648 ssl_debug_printf("ssl_init entry malformed can't find protocol in %s\n", port);
1654 filename = strchr(protocol,',');
1657 ssl_debug_printf("ssl_init entry malformed can't find filename in %s\n", port);
1663 /* convert ip and port string to network rappresentation*/
1664 service = g_malloc(sizeof(SslService) + 4);
1665 service->addr.type = AT_IPv4;
1666 service->addr.len = 4;
1667 service->addr.data = ip = ((guchar*)service) + sizeof(SslService);
1668 sscanf(addr, "%hhu.%hhu.%hhu.%hhu", &ip[0], &ip[1], &ip[2], &ip[3]);
1669 service->port = atoi(port);
1670 ssl_debug_printf("ssl_init addr %hhu.%hhu.%hhu.%hhu port %d filename %s\n",
1671 ip[0], ip[1], ip[2], ip[3], service->port, filename);
1673 /* try to load pen file*/
1674 fp = fopen(filename, "rb");
1676 fprintf(stderr, "can't open file %s \n",filename);
1680 private_key = ssl_load_key(fp);
1682 fprintf(stderr,"can't load private key from %s\n",
1688 ssl_debug_printf("ssl_init private key file %s successfully loaded\n",
1690 g_hash_table_insert(key_hash, service, private_key);
1692 ssl_association_add(associations, handle, atoi(port), protocol, tcp, TRUE);
1694 } while (end != NULL);
1698 /* store master secret into session data cache */
1700 ssl_save_session(SslDecryptSession* ssl, GHashTable *session_hash)
1702 /* allocate stringinfo chunks for session id and master secret data*/
1703 StringInfo* session_id;
1704 StringInfo* master_secret;
1705 session_id = se_alloc0(sizeof(StringInfo) + ssl->session_id.data_len);
1706 master_secret = se_alloc0(48 + sizeof(StringInfo));
1708 master_secret->data = ((guchar*)master_secret+sizeof(StringInfo));
1709 session_id->data = ((guchar*)session_id+sizeof(StringInfo));
1711 ssl_data_set(session_id, ssl->session_id.data, ssl->session_id.data_len);
1712 ssl_data_set(master_secret, ssl->master_secret.data, ssl->master_secret.data_len);
1713 g_hash_table_insert(session_hash, session_id, master_secret);
1714 ssl_print_string("ssl_save_session stored session id", session_id);
1715 ssl_print_string("ssl_save_session stored master secret", master_secret);
1719 ssl_restore_session(SslDecryptSession* ssl, GHashTable *session_hash)
1722 ms = g_hash_table_lookup(session_hash, &ssl->session_id);
1725 ssl_debug_printf("ssl_restore_session can't find stored session\n");
1728 ssl_data_set(&ssl->master_secret, ms->data, ms->data_len);
1729 ssl->state |= SSL_MASTER_SECRET;
1730 ssl_debug_printf("ssl_restore_session master key retrived\n");
1734 ssl_is_valid_content_type(guint8 type)
1736 if (type >= 0x14 && type <= 0x17)
1744 #ifdef SSL_DECRYPT_DEBUG
1746 static FILE* ssl_debug_file=NULL;
1749 ssl_set_debug(char* name)
1751 static gint debug_file_must_be_closed;
1753 debug_file_must_be_closed = 0;
1754 use_stderr = name?(strcmp(name, SSL_DEBUG_USE_STDERR) == 0):0;
1756 if (debug_file_must_be_closed)
1757 fclose(ssl_debug_file);
1759 ssl_debug_file = stderr;
1760 else if (!name || (strcmp(name, "") ==0))
1761 ssl_debug_file = NULL;
1763 ssl_debug_file = fopen(name, "w");
1764 if (!use_stderr && ssl_debug_file)
1765 debug_file_must_be_closed = 1;
1770 ssl_debug_printf(const gchar* fmt, ...)
1776 if (!ssl_debug_file)
1780 ret += vfprintf(ssl_debug_file, fmt, ap);
1782 fflush(ssl_debug_file);
1786 ssl_print_text_data(const gchar* name, const guchar* data, gint len)
1789 if (!ssl_debug_file)
1791 fprintf(ssl_debug_file,"%s: ",name);
1792 for (i=0; i< len; i++) {
1793 fprintf(ssl_debug_file,"%c",data[i]);
1795 fprintf(ssl_debug_file,"\n");
1796 fflush(ssl_debug_file);
1800 ssl_print_data(const gchar* name, const guchar* data, gint len)
1803 if (!ssl_debug_file)
1805 fprintf(ssl_debug_file,"%s[%d]:\n",name, len);
1806 for (i=0; i< len; i++) {
1807 if ((i>0) && (i%16 == 0))
1808 fprintf(ssl_debug_file,"\n");
1809 fprintf(ssl_debug_file,"%.2x ",data[i]&255);
1811 fprintf(ssl_debug_file,"\n");
1812 fflush(ssl_debug_file);
1816 ssl_print_string(const gchar* name, const StringInfo* data)
1818 ssl_print_data(name, data->data, data->data_len);
1820 #endif /* SSL_DECRYPT_DEBUG */