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wireshark/epan/dissectors/packet-ssl-utils.c

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/* packet-ssl-utils.c
*
* $Id$
*
* ssl manipulation functions
* By Paolo Abeni <paolo.abeni@email.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "packet-ssl-utils.h"
void
ssl_data_set(StringInfo* str, unsigned char* data, unsigned int len)
{
memcpy(str->data, data, len);
str->data_len = len;
}
#ifdef HAVE_LIBGNUTLS
/* hmac abstraction layer */
#define SSL_HMAC gcry_md_hd_t
static inline void
ssl_hmac_init(SSL_HMAC* md, const void * key, int len, int algo)
{
gcry_md_open(md,algo, GCRY_MD_FLAG_HMAC);
gcry_md_setkey (*(md), key, len);
}
static inline void
ssl_hmac_update(SSL_HMAC* md, const void* data, int len)
{
gcry_md_write(*(md), data, len);
}
static inline void
ssl_hmac_final(SSL_HMAC* md, unsigned char* data, unsigned int* datalen)
{
int algo = gcry_md_get_algo (*(md));
unsigned int len = gcry_md_get_algo_dlen(algo);
memcpy(data, gcry_md_read(*(md), algo), len);
*datalen =len;
}
static inline void
ssl_hmac_cleanup(SSL_HMAC* md)
{
gcry_md_close(*(md));
}
/* memory digest abstraction layer*/
#define SSL_MD gcry_md_hd_t
static inline void
ssl_md_init(SSL_MD* md, int algo)
{
gcry_md_open(md,algo, 0);
}
static inline void
ssl_md_update(SSL_MD* md, unsigned char* data, int len)
{
gcry_md_write(*(md), data, len);
}
static inline void
ssl_md_final(SSL_MD* md, unsigned char* data, unsigned int* datalen)
{
int algo = gcry_md_get_algo (*(md));
int len = gcry_md_get_algo_dlen (algo);
memcpy(data, gcry_md_read(*(md), algo), len);
*datalen = len;
}
static inline void
ssl_md_cleanup(SSL_MD* md)
{
gcry_md_close(*(md));
}
/* md5 /sha abstraction layer */
#define SSL_SHA_CTX gcry_md_hd_t
#define SSL_MD5_CTX gcry_md_hd_t
static inline void
ssl_sha_init(SSL_SHA_CTX* md)
{
gcry_md_open(md,GCRY_MD_SHA1, 0);
}
static inline void
ssl_sha_update(SSL_SHA_CTX* md, unsigned char* data, int len)
{
gcry_md_write(*(md), data, len);
}
static inline void
ssl_sha_final(unsigned char* buf, SSL_SHA_CTX* md)
{
memcpy(buf, gcry_md_read(*(md), GCRY_MD_SHA1),
gcry_md_get_algo_dlen(GCRY_MD_SHA1));
}
static inline void
ssl_sha_cleanup(SSL_SHA_CTX* md)
{
gcry_md_close(*(md));
}
static inline int
ssl_md5_init(SSL_MD5_CTX* md)
{
return gcry_md_open(md,GCRY_MD_MD5, 0);
}
static inline void
ssl_md5_update(SSL_MD5_CTX* md, unsigned char* data, int len)
{
gcry_md_write(*(md), data, len);
}
static inline void
ssl_md5_final(unsigned char* buf, SSL_MD5_CTX* md)
{
memcpy(buf, gcry_md_read(*(md), GCRY_MD_MD5),
gcry_md_get_algo_dlen(GCRY_MD_MD5));
}
static inline void
ssl_md5_cleanup(SSL_MD5_CTX* md)
{
gcry_md_close(*(md));
}
/* stream cipher abstraction layer*/
static int
ssl_cipher_init(gcry_cipher_hd_t *cipher, int algo, unsigned char* sk,
unsigned char* iv, int mode)
{
int gcry_modes[]={
GCRY_CIPHER_MODE_STREAM,
GCRY_CIPHER_MODE_CBC
};
int err = gcry_cipher_open(cipher, algo, gcry_modes[mode], 0);
if (err !=0)
return -1;
err = gcry_cipher_setkey(*(cipher), sk, gcry_cipher_get_algo_keylen (algo));
if (err != 0)
return -1;
err = gcry_cipher_setiv(*(cipher), iv, gcry_cipher_get_algo_blklen (algo));
if (err != 0)
return -1;
return 0;
}
static inline int
ssl_cipher_decrypt(gcry_cipher_hd_t *cipher, unsigned char * out, int outl,
const unsigned char * in,int inl)
{
return gcry_cipher_decrypt ( *(cipher), out, outl, in, inl);
}
static inline int
ssl_get_digest_by_name(const char*name)
{
return gcry_md_map_name(name);
}
static inline int
ssl_get_cipher_by_name(const char* name)
{
return gcry_cipher_map_name(name);
}
/* private key abstraction layer */
static inline int
ssl_get_key_len(SSL_PRIVATE_KEY* pk) {return gcry_pk_get_nbits (pk); }
gcry_err_code_t
_gcry_rsa_decrypt (int algo, gcry_mpi_t *result, gcry_mpi_t *data,
gcry_mpi_t *skey, int flags);
#define PUBKEY_FLAG_NO_BLINDING (1 << 0)
/* decrypt data with private key. Store decrypted data directly into input
* buffer */
int
ssl_private_decrypt(unsigned int len, unsigned char* encr_data, SSL_PRIVATE_KEY* pk)
{
int rc;
size_t decr_len = 0;
gcry_sexp_t s_data, s_plain;
gcry_mpi_t encr_mpi;
size_t i, encr_len = len;
unsigned char* decr_data_ptr;
gcry_mpi_t text=NULL;
/* build up a mpi rappresentation for encrypted data */
rc = gcry_mpi_scan(&encr_mpi, GCRYMPI_FMT_USG,encr_data, encr_len, &encr_len);
if (rc != 0 ) {
ssl_debug_printf("pcry_private_decrypt: can't convert encr_data to mpi (size %d):%s\n",
len, gcry_strerror(rc));
return 0;
}
#ifndef SSL_FAST
/* put the data into a simple list */
rc = gcry_sexp_build(&s_data, NULL, "(enc-val(rsa(a%m)))", encr_mpi);
if (rc != 0) {
ssl_debug_printf("pcry_private_decrypt: can't build encr_sexp:%s \n",
gcry_strerror(rc));
return 0;
}
/* pass it to libgcrypt */
rc = gcry_pk_decrypt(&s_plain, s_data, pk);
gcry_sexp_release(s_data);
if (rc != 0)
{
ssl_debug_printf("pcry_private_decrypt: can't decrypt key:%s\n",
gcry_strerror(rc));
goto out;
}
/* convert plain text sexp to mpi format */
text = gcry_sexp_nth_mpi(s_plain, 0, 0);
/* compute size requested for plaintext buffer */
decr_len = len;
if (gcry_mpi_print(GCRYMPI_FMT_USG, NULL, decr_len, &decr_len, text) != 0) {
ssl_debug_printf("pcry_private_decrypt: can't compute decr size:%s\n",
gcry_strerror(rc));
decr_len = 0;
goto out;
}
/* sanity check on out buffer */
if (decr_len > len) {
ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
decr_len, len);
return 0;
}
/* write plain text to encrypted data buffer */
decr_data_ptr = encr_data;
if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
text) != 0) {
ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
decr_len, gcry_strerror(rc));
g_free(decr_data_ptr);
decr_len = 0;
goto out;
}
/* strip the padding*/
rc = 0;
for (i = 1; i < decr_len; i++) {
if (decr_data_ptr[i] == 0) {
rc = i+1;
break;
}
}
ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
rc, decr_len);
ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
decr_len -= rc;
out:
gcry_sexp_release(s_plain);
#else /* SSL_FAST */
rc = _gcry_rsa_decrypt(0, &text, &encr_mpi, pk,0);
gcry_mpi_print( GCRYMPI_FMT_USG, 0, 0, &decr_len, text);
/* sanity check on out buffer */
if (decr_len > len) {
ssl_debug_printf("pcry_private_decrypt: decrypted data is too long ?!? (%d max %d)\n",
decr_len, len);
return 0;
}
/* write plain text to newly allocated buffer */
decr_data_ptr = encr_data;
if (gcry_mpi_print( GCRYMPI_FMT_USG, decr_data_ptr, decr_len, &decr_len,
text) != 0) {
ssl_debug_printf("pcry_private_decrypt: can't print decr data to mpi (size %d):%s\n",
decr_len, gcry_strerror(rc));
return 0;
}
/* strip the padding*/
rc = 0;
for (i = 1; i < decr_len; i++) {
if (decr_data_ptr[i] == 0) {
rc = i+1;
break;
}
}
ssl_debug_printf("pcry_private_decrypt: stripping %d bytes, decr_len %d\n",
rc, decr_len);
ssl_print_data("decypted_unstrip_pre_master", decr_data_ptr, decr_len);
g_memmove(decr_data_ptr, &decr_data_ptr[rc], decr_len - rc);
decr_len -= rc;
#endif /* SSL_FAST */
gcry_mpi_release(text);
return decr_len;
}
/* stringinfo interface */
static int
ssl_data_alloc(StringInfo* str, unsigned int len)
{
str->data = g_malloc(len);
if (!str->data)
return -1;
str->data_len = len;
return 0;
}
#define PRF(ssl,secret,usage,rnd1,rnd2,out) ((ssl->version_netorder==SSLV3_VERSION)? \
ssl3_prf(secret,usage,rnd1,rnd2,out): \
tls_prf(secret,usage,rnd1,rnd2,out))
static const char *digests[]={
"MD5",
"SHA1"
};
static const char *ciphers[]={
"DES",
"DES3",
"ARCFOUR", /* gnutls does not support rc4, but this should be 100% compatible*/
"RC2",
"IDEA",
"AES",
"AES256",
"*UNKNOWN*"
};
/* look in openssl/ssl/ssl_lib.c for a complete list of available cipersuite*/
static SslCipherSuite cipher_suites[]={
{1,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
{2,KEX_RSA,SIG_RSA,ENC_NULL,0,0,0,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{3,KEX_RSA,SIG_RSA,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
{4,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
{5,KEX_RSA,SIG_RSA,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{6,KEX_RSA,SIG_RSA,ENC_RC2,8,128,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{7,KEX_RSA,SIG_RSA,ENC_IDEA,8,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{8,KEX_RSA,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{9,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{10,KEX_RSA,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{11,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{12,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{13,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{14,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{15,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{16,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{17,KEX_DH,SIG_DSS,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{18,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{19,KEX_DH,SIG_DSS,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{20,KEX_DH,SIG_RSA,ENC_DES,8,64,40,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{21,KEX_DH,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{22,KEX_DH,SIG_RSA,ENC_3DES,8,192,192,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{23,KEX_DH,SIG_NONE,ENC_RC4,1,128,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
{24,KEX_DH,SIG_NONE,ENC_RC4,1,128,128,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
{25,KEX_DH,SIG_NONE,ENC_DES,8,64,40,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
{26,KEX_DH,SIG_NONE,ENC_DES,8,64,64,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
{27,KEX_DH,SIG_NONE,ENC_3DES,8,192,192,DIG_MD5,16,0, SSL_CIPHER_MODE_STREAM},
{47,KEX_RSA,SIG_RSA,ENC_AES,16,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
{53,KEX_RSA,SIG_RSA,ENC_AES256,16,256,256,DIG_SHA,20,0, SSL_CIPHER_MODE_CBC},
{96,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
{97,KEX_RSA,SIG_RSA,ENC_RC2,1,128,56,DIG_MD5,16,1, SSL_CIPHER_MODE_STREAM},
{98,KEX_RSA,SIG_RSA,ENC_DES,8,64,64,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{99,KEX_DH,SIG_DSS,ENC_DES,8,64,64,DIG_SHA,16,1, SSL_CIPHER_MODE_STREAM},
{100,KEX_RSA,SIG_RSA,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{101,KEX_DH,SIG_DSS,ENC_RC4,1,128,56,DIG_SHA,20,1, SSL_CIPHER_MODE_STREAM},
{102,KEX_DH,SIG_DSS,ENC_RC4,1,128,128,DIG_SHA,20,0, SSL_CIPHER_MODE_STREAM},
{-1, 0,0,0,0,0,0,0,0,0, 0}
};
#define MAX_BLOCK_SIZE 16
#define MAX_KEY_SIZE 32
int
ssl_find_cipher(int num,SslCipherSuite* cs)
{
SslCipherSuite *c;
for(c=cipher_suites;c->number!=-1;c++){
if(c->number==num){
*cs=*c;
return 0;
}
}
return -1;
}
static int
tls_hash(StringInfo* secret,
StringInfo* seed, int md, StringInfo* out)
{
guint8 *ptr=out->data;
unsigned int left=out->data_len;
int tocpy;
guint8 *A;
guint8 _A[20],tmp[20];
unsigned int A_l,tmp_l;
SSL_HMAC hm;
ssl_print_string("tls_hash: hash secret", secret);
ssl_print_string("tls_hash: hash seed", seed);
A=seed->data;
A_l=seed->data_len;
while(left){
ssl_hmac_init(&hm,secret->data,secret->data_len,md);
ssl_hmac_update(&hm,A,A_l);
ssl_hmac_final(&hm,_A,&A_l);
ssl_hmac_cleanup(&hm);
A=_A;
ssl_hmac_init(&hm,secret->data,secret->data_len,md);
ssl_hmac_update(&hm,A,A_l);
ssl_hmac_update(&hm,seed->data,seed->data_len);
ssl_hmac_final(&hm,tmp,&tmp_l);
ssl_hmac_cleanup(&hm);
tocpy=MIN(left,tmp_l);
memcpy(ptr,tmp,tocpy);
ptr+=tocpy;
left-=tocpy;
}
ssl_print_string("hash out", out);
return (0);
}
static int
tls_prf(StringInfo* secret, const char *usage,
StringInfo* rnd1, StringInfo* rnd2, StringInfo* out)
{
StringInfo seed, sha_out, md5_out;
guint8 *ptr;
StringInfo s1, s2;
unsigned int i,s_l, r=-1;
int usage_len = strlen(usage);
/* initalize buffer for sha, md5 random seed*/
if (ssl_data_alloc(&sha_out, MAX(out->data_len,20)) < 0)
return -1;
if (ssl_data_alloc(&md5_out, MAX(out->data_len,16)) < 0)
goto free_sha;
if (ssl_data_alloc(&seed, usage_len+rnd1->data_len+rnd2->data_len) < 0)
goto free_md5;
ptr=seed.data;
memcpy(ptr,usage,usage_len); ptr+=usage_len;
memcpy(ptr,rnd1->data,rnd1->data_len); ptr+=rnd1->data_len;
memcpy(ptr,rnd2->data,rnd2->data_len); ptr+=rnd2->data_len;
/* initalize buffer for client/server seeds*/
s_l=secret->data_len/2 + secret->data_len%2;
if (ssl_data_alloc(&s1, s_l) < 0)
goto free_seed;
if (ssl_data_alloc(&s2, s_l) < 0)
goto free_s1;
memcpy(s1.data,secret->data,s_l);
memcpy(s2.data,secret->data + (secret->data_len - s_l),s_l);
ssl_debug_printf("tls_prf: tls_hash(md5 secret_len %d seed_len %d )\n", s1.data_len, seed.data_len);
if(tls_hash(&s1,&seed,ssl_get_digest_by_name("MD5"),&md5_out) != 0)
goto free_all;
ssl_debug_printf("tls_prf: tls_hash(sha)\n");
if(tls_hash(&s2,&seed,ssl_get_digest_by_name("SHA1"),&sha_out) != 0)
goto free_all;
for(i=0;i<out->data_len;i++)
out->data[i]=md5_out.data[i] ^ sha_out.data[i];
r =0;
ssl_print_string("PRF out",out);
free_all:
free(s2.data);
free_s1:
free(s1.data);
free_seed:
free(seed.data);
free_md5:
free(md5_out.data);
free_sha:
free(sha_out.data);
return r;
}
static int
ssl3_generate_export_iv(StringInfo* r1,
StringInfo* r2, StringInfo* out)
{
SSL_MD5_CTX md5;
guint8 tmp[16];
ssl_md5_init(&md5);
ssl_md5_update(&md5,r1->data,r1->data_len);
ssl_md5_update(&md5,r2->data,r2->data_len);
ssl_md5_final(tmp,&md5);
ssl_md5_cleanup(&md5);
memcpy(out->data,tmp,out->data_len);
ssl_print_string("export iv", out);
return(0);
}
static int
ssl3_prf(StringInfo* secret, const char* usage,
StringInfo* r1,
StringInfo* r2,StringInfo* out)
{
SSL_MD5_CTX md5;
SSL_SHA_CTX sha;
StringInfo *rnd1,*rnd2;
unsigned int off;
int i=0,j;
guint8 buf[20];
rnd1=r1; rnd2=r2;
for(off=0;off<out->data_len;off+=16){
unsigned char outbuf[16];
int tocpy;
i++;
ssl_debug_printf("ssl3_prf: sha1_hash(%d)\n",i);
/* A, BB, CCC, ... */
for(j=0;j<i;j++){
buf[j]=64+i;
}
ssl_sha_init(&sha);
ssl_sha_update(&sha,buf,i);
ssl_sha_update(&sha,secret->data,secret->data_len);
if(!strcmp(usage,"client write key") || !strcmp(usage,"server write key")){
ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
}
else{
ssl_sha_update(&sha,rnd1->data,rnd1->data_len);
ssl_sha_update(&sha,rnd2->data,rnd2->data_len);
}
ssl_sha_final(buf,&sha);
ssl_sha_cleanup(&sha);
ssl_debug_printf("ssl3_prf: md5_hash(%d) datalen %d\n",i,
secret->data_len);
ssl_md5_init(&md5);
ssl_md5_update(&md5,secret->data,secret->data_len);
ssl_md5_update(&md5,buf,20);
ssl_md5_final(outbuf,&md5);
ssl_md5_cleanup(&md5);
tocpy=MIN(out->data_len-off,16);
memcpy(out->data+off,outbuf,tocpy);
}
return(0);
}
static int
ssl_create_decoder(SslDecoder *dec, SslCipherSuite *cipher_suite,
guint8 *mk, guint8 *sk, guint8 *iv)
{
int ciph=0;
/* Find the SSLeay cipher */
if(cipher_suite->enc!=ENC_NULL) {
ssl_debug_printf("ssl_create_decoder CIPHER: %s\n", ciphers[cipher_suite->enc-0x30]);
ciph=ssl_get_cipher_by_name(ciphers[cipher_suite->enc-0x30]);
}
if (ciph == 0) {
ssl_debug_printf("ssl_create_decoder can't find cipher %s\n",
ciphers[(cipher_suite->enc-0x30) > 7 ? 7 : (cipher_suite->enc-0x30)]);
return -1;
}
/* init mac buffer: mac storage is embedded into decoder struct to save a
memory allocation and waste samo more memory*/
dec->cipher_suite=cipher_suite;
dec->mac_key.data = dec->_mac_key;
ssl_data_set(&dec->mac_key, mk, cipher_suite->dig_len);
if (ssl_cipher_init(&dec->evp,ciph,sk,iv,cipher_suite->mode) < 0) {
ssl_debug_printf("ssl_create_decoder: can't create cipher id:%d mode:%d\n",
ciph, cipher_suite->mode);
return -1;
}
ssl_debug_printf("decoder initialized (digest len %d)\n", cipher_suite->dig_len);
return 0;
}
int
ssl_generate_keyring_material(SslDecryptSession*ssl_session)
{
StringInfo key_block;
guint8 _iv_c[MAX_BLOCK_SIZE],_iv_s[MAX_BLOCK_SIZE];
guint8 _key_c[MAX_KEY_SIZE],_key_s[MAX_KEY_SIZE];
int needed;
guint8 *ptr,*c_wk,*s_wk,*c_mk,*s_mk,*c_iv = _iv_c,*s_iv = _iv_s;
/* if master_key is not yet generate, create it now*/
if (!(ssl_session->state & SSL_MASTER_SECRET)) {
ssl_debug_printf("ssl_generate_keyring_material:PRF(pre_master_secret)\n");
if (PRF(ssl_session,&ssl_session->pre_master_secret,"master secret",
&ssl_session->client_random,
&ssl_session->server_random, &ssl_session->master_secret)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate master_secret\n");
return -1;
}
ssl_print_string("master secret",&ssl_session->master_secret);
}
/* Compute the key block. First figure out how much data we need*/
needed=ssl_session->cipher_suite.dig_len*2;
needed+=ssl_session->cipher_suite.bits / 4;
if(ssl_session->cipher_suite.block>1)
needed+=ssl_session->cipher_suite.block*2;
key_block.data_len = needed;
key_block.data = g_malloc(needed);
if (!key_block.data) {
ssl_debug_printf("ssl_generate_keyring_material can't allacate key_block\n");
return -1;
}
ssl_debug_printf("ssl_generate_keyring_material sess key generation\n");
if (PRF(ssl_session,&ssl_session->master_secret,"key expansion",
&ssl_session->server_random,&ssl_session->client_random,
&key_block)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate key_block\n");
goto fail;
}
ssl_print_string("key expansion", &key_block);
ptr=key_block.data;
c_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
s_mk=ptr; ptr+=ssl_session->cipher_suite.dig_len;
c_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
s_wk=ptr; ptr+=ssl_session->cipher_suite.eff_bits/8;
if(ssl_session->cipher_suite.block>1){
c_iv=ptr; ptr+=ssl_session->cipher_suite.block;
s_iv=ptr; ptr+=ssl_session->cipher_suite.block;
}
if(ssl_session->cipher_suite.export){
StringInfo iv_c,iv_s;
StringInfo key_c,key_s;
StringInfo k;
if(ssl_session->cipher_suite.block>1){
/* We only have room for MAX_BLOCK_SIZE bytes IVs, but that's
all we should need. This is a sanity check */
if(ssl_session->cipher_suite.block>MAX_BLOCK_SIZE) {
ssl_debug_printf("ssl_generate_keyring_material cipher suite block must be at most %d nut is %d\n",
MAX_BLOCK_SIZE, ssl_session->cipher_suite.block);
goto fail;
}
iv_c.data = _iv_c;
iv_c.data_len = ssl_session->cipher_suite.block;
iv_s.data = _iv_s;
iv_s.data_len = ssl_session->cipher_suite.block;
if(ssl_session->version_netorder==SSLV3_VERSION){
ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv\n");
if (ssl3_generate_export_iv(&ssl_session->client_random,
&ssl_session->server_random,&iv_c)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 client iv\n");
goto fail;
}
ssl_debug_printf("ssl_generate_keyring_material ssl3_generate_export_iv(2)\n");
if (ssl3_generate_export_iv(&ssl_session->server_random,
&ssl_session->client_random,&iv_s)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate sslv3 server iv\n");
goto fail;
}
}
else{
guint8 _iv_block[MAX_BLOCK_SIZE * 2];
StringInfo iv_block;
StringInfo key_null;
guint8 _key_null;
key_null.data = &_key_null;
key_null.data_len = 0;
iv_block.data = _iv_block;
iv_block.data_len = ssl_session->cipher_suite.block*2;
ssl_debug_printf("ssl_generate_keyring_material prf(iv_block)\n");
if(PRF(ssl_session,&key_null, "IV block",
&ssl_session->client_random,
&ssl_session->server_random,&iv_block)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate tls31 iv block\n");
goto fail;
}
memcpy(_iv_c,iv_block.data,ssl_session->cipher_suite.block);
memcpy(_iv_s,iv_block.data+ssl_session->cipher_suite.block,
ssl_session->cipher_suite.block);
}
c_iv=_iv_c;
s_iv=_iv_s;
}
if (ssl_session->version_netorder==SSLV3_VERSION){
SSL_MD5_CTX md5;
ssl_debug_printf("ssl_generate_keyring_material MD5(client_random)\n");
ssl_md5_init(&md5);
ssl_md5_update(&md5,c_wk,ssl_session->cipher_suite.eff_bits/8);
ssl_md5_update(&md5,ssl_session->client_random.data,
ssl_session->client_random.data_len);
ssl_md5_update(&md5,ssl_session->server_random.data,
ssl_session->server_random.data_len);
ssl_md5_final(_key_c,&md5);
ssl_md5_cleanup(&md5);
c_wk=_key_c;
ssl_md5_init(&md5);
ssl_debug_printf("ssl_generate_keyring_material MD5(server_random)\n");
ssl_md5_update(&md5,s_wk,ssl_session->cipher_suite.eff_bits/8);
ssl_md5_update(&md5,ssl_session->server_random.data,
ssl_session->server_random.data_len);
ssl_md5_update(&md5,ssl_session->client_random.data,
ssl_session->client_random.data_len);
ssl_md5_final(_key_s,&md5);
ssl_md5_cleanup(&md5);
s_wk=_key_s;
}
else{
key_c.data = _key_c;
key_c.data_len = sizeof(_key_c);
key_s.data = _key_s;
key_s.data_len = sizeof(_key_s);
k.data = c_wk;
k.data_len = ssl_session->cipher_suite.eff_bits/8;
ssl_debug_printf("ssl_generate_keyring_material PRF(key_c)\n");
if (PRF(ssl_session,&k,"client write key",
&ssl_session->client_random,
&ssl_session->server_random, &key_c)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 server key \n");
goto fail;
}
c_wk=_key_c;
k.data = s_wk;
k.data_len = ssl_session->cipher_suite.eff_bits/8;
ssl_debug_printf("ssl_generate_keyring_material PRF(key_s)\n");
if(PRF(ssl_session,&k,"server write key",
&ssl_session->client_random,
&ssl_session->server_random, &key_s)) {
ssl_debug_printf("ssl_generate_keyring_material can't generate tll31 client key \n");
goto fail;
}
s_wk=_key_s;
}
}
/* show key material info */
ssl_print_data("Client MAC key",c_mk,ssl_session->cipher_suite.dig_len);
ssl_print_data("Server MAC key",s_mk,ssl_session->cipher_suite.dig_len);
ssl_print_data("Client Write key",c_wk,ssl_session->cipher_suite.bits/8);
ssl_print_data("Server Write key",s_wk,ssl_session->cipher_suite.bits/8);
if(ssl_session->cipher_suite.block>1) {
ssl_print_data("Client Write IV",c_iv,ssl_session->cipher_suite.block);
ssl_print_data("Server Write IV",s_iv,ssl_session->cipher_suite.block);
}
else {
ssl_print_data("Client Write IV",c_iv,8);
ssl_print_data("Server Write IV",s_iv,8);
}
/* create both client and server ciphers*/
ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(client)\n");
if (ssl_create_decoder(&ssl_session->client,
&ssl_session->cipher_suite,c_mk,c_wk,c_iv)) {
ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
goto fail;
}
ssl_debug_printf("ssl_generate_keyring_material ssl_create_decoder(server)\n");
if (ssl_create_decoder(&ssl_session->server,
&ssl_session->cipher_suite,s_mk,s_wk,s_iv)) {
ssl_debug_printf("ssl_generate_keyring_material can't init client decoder\n");
goto fail;
}
g_free(key_block.data);
return 0;
fail:
g_free(key_block.data);
return -1;
}
int
ssl_decrypt_pre_master_secret(SslDecryptSession*ssl_session,
StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
{
int i;
if(ssl_session->cipher_suite.kex!=KEX_RSA) {
ssl_debug_printf("ssl_decrypt_pre_master_secret key %d diferent from KEX_RSA(%d)\n",
ssl_session->cipher_suite.kex, KEX_RSA);
return(-1);
}
/* with tls key loading will fail if not rsa type, so no need to check*/
ssl_print_string("pre master encrypted",entrypted_pre_master);
ssl_debug_printf("ssl_decrypt_pre_master_secret:RSA_private_decrypt\n");
i=ssl_private_decrypt(entrypted_pre_master->data_len,
entrypted_pre_master->data, pk);
if (i!=48) {
ssl_debug_printf("ssl_decrypt_pre_master_secret wrong "
"pre_master_secret lenght (%d, expected %d)\n", i, 48);
return -1;
}
/* the decrypted data has been written into the pre_master key buffer */
ssl_session->pre_master_secret.data = entrypted_pre_master->data;
ssl_session->pre_master_secret.data_len=48;
ssl_print_string("pre master secret",&ssl_session->pre_master_secret);
/* Remove the master secret if it was there.
This force keying material regeneration in
case we're renegotiating */
ssl_session->state &= ~SSL_MASTER_SECRET;
return 0;
}
/* convert network byte order 32 byte number to right-aligned host byte order *
* 8 bytes buffer */
static int fmt_seq(guint32 num, guint8* buf)
{
guint32 netnum;
memset(buf,0,8);
netnum=g_htonl(num);
memcpy(buf+4,&netnum,4);
return(0);
}
static int
tls_check_mac(SslDecoder*decoder, int ct,int ver, guint8* data,
guint32 datalen, guint8* mac)
{
SSL_HMAC hm;
int md;
guint32 len;
guint8 buf[20];
md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
ssl_debug_printf("tls_check_mac mac type:%s md %d\n",
digests[decoder->cipher_suite->dig-0x40], md);
ssl_hmac_init(&hm,decoder->mac_key.data,decoder->mac_key.data_len,md);
/* hash sequence number */
fmt_seq(decoder->seq,buf);
decoder->seq++;
ssl_hmac_update(&hm,buf,8);
/* hash content type */
buf[0]=ct;
ssl_hmac_update(&hm,buf,1);
/* hash version,data lenght and data*/
*((gint16*)buf) = g_htons(ver);
ssl_hmac_update(&hm,buf,2);
*((gint16*)buf) = g_htons(datalen);
ssl_hmac_update(&hm,buf,2);
ssl_hmac_update(&hm,data,datalen);
/* get digest and digest len*/
ssl_hmac_final(&hm,buf,&len);
ssl_print_data("Mac", buf, len);
if(memcmp(mac,buf,len))
return -1;
ssl_hmac_cleanup(&hm);
return(0);
}
int
ssl3_check_mac(SslDecoder*decoder,int ct,guint8* data,
guint32 datalen, guint8* mac)
{
SSL_MD mc;
int md;
guint32 len;
guint8 buf[64],dgst[20];
int pad_ct;
pad_ct=(decoder->cipher_suite->dig==DIG_SHA)?40:48;
/* get cipher used for digest comptuation */
md=ssl_get_digest_by_name(digests[decoder->cipher_suite->dig-0x40]);
ssl_debug_printf("ssl3_check_mac digest%s md %d\n",
digests[decoder->cipher_suite->dig-0x40], md);
ssl_md_init(&mc,md);
ssl_debug_printf("ssl3_check_mac memory digest %p\n",mc);
/* do hash computation on data && padding */
ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
/* hash padding*/
memset(buf,0x36,pad_ct);
ssl_md_update(&mc,buf,pad_ct);
/* hash sequence number */
fmt_seq(decoder->seq,buf);
decoder->seq++;
ssl_md_update(&mc,buf,8);
/* hash content type */
buf[0]=ct;
ssl_md_update(&mc,buf,1);
/* hash data lenght in network byte order and data*/
*((gint16* )buf) = g_htons(datalen);
ssl_md_update(&mc,buf,2);
ssl_md_update(&mc,data,datalen);
/* get partial digest */
ssl_md_final(&mc,dgst,&len);
ssl_md_cleanup(&mc);
ssl_md_init(&mc,md);
/* hash mac key */
ssl_md_update(&mc,decoder->mac_key.data,decoder->mac_key.data_len);
/* hash padding and partial digest*/
memset(buf,0x5c,pad_ct);
ssl_md_update(&mc,buf,pad_ct);
ssl_md_update(&mc,dgst,len);
ssl_md_final(&mc,dgst,&len);
ssl_md_cleanup(&mc);
if(memcmp(mac,dgst,len))
return -1;
return(0);
}
int
ssl_decrypt_record(SslDecryptSession*ssl,SslDecoder* decoder, int ct,
const unsigned char* in, int inl,unsigned char*out,int* outl)
{
int pad, worklen;
guint8 *mac;
ssl_debug_printf("ssl_decrypt_record ciphertext len %d\n", inl);
ssl_print_data("Ciphertext",in, inl);
/* First decrypt*/
if ((pad = ssl_cipher_decrypt(&decoder->evp,out,*outl,in,inl))!= 0)
ssl_debug_printf("ssl_decrypt_record: %s %s\n", gcry_strsource (pad),
gcry_strerror (pad));
ssl_print_data("Plaintext",out,inl);
worklen=inl;
/* Now strip off the padding*/
if(decoder->cipher_suite->block!=1){
pad=out[inl-1];
worklen-=(pad+1);
ssl_debug_printf("ssl_decrypt_record found padding %d final len %d\n",
pad, *outl);
}
/* And the MAC */
worklen-=decoder->cipher_suite->dig_len;
if (worklen < 0)
{
ssl_debug_printf("ssl_decrypt_record wrong record len/padding outlen %d\n work %d\n",*outl, worklen);
return -1;
}
mac=out+worklen;
/*ssl_print_data("Record data",out,*outl);*/
/* Now check the MAC */
ssl_debug_printf("checking mac (len %d, version %X, ct %d)\n", worklen,ssl->version_netorder, ct);
if(ssl->version_netorder==0x300){
if(ssl3_check_mac(decoder,ct,out,worklen,mac) < 0) {
ssl_debug_printf("ssl_decrypt_record: mac falied\n");
return -1;
}
}
else{
if(tls_check_mac(decoder,ct,ssl->version_netorder,out,worklen,mac)< 0) {
ssl_debug_printf("ssl_decrypt_record: mac falied\n");
return -1;
}
}
ssl_debug_printf("ssl_decrypt_record: mac ok\n");
*outl = worklen;
return(0);
}
/* old relase of gnutls does not define the appropriate macros, so get
* them from the string*/
static void
ssl_get_version(int* major, int* minor, int* patch)
{
const char* str = gnutls_check_version(NULL);
ssl_debug_printf("ssl_get_version: %s\n", str);
sscanf(str, "%d.%d.%d", major, minor, patch);
}
SSL_PRIVATE_KEY*
ssl_load_key(FILE* fp)
{
/* gnutls make our work much harded, since we have to work internally with
* s-exp formatted data, but PEM loader export only in "gnutls_datum"
* format, and a datum -> s-exp convertion function does not exist.
*/
struct gnutls_x509_privkey_int* priv_key;
gnutls_datum key;
gnutls_datum m, e, d, p,q, u;
int size, major, minor, patch;
unsigned int bytes;
unsigned int tmp_size;
#ifdef SSL_FAST
gcry_mpi_t* rsa_params = g_malloc(sizeof(gcry_mpi_t)*6);
#else
gcry_mpi_t rsa_params[6];
#endif
gcry_sexp_t rsa_priv_key;
/* init private key data*/
gnutls_x509_privkey_init(&priv_key);
/* compute file size and load all file contents into a datum buffer*/
if (fseek(fp, 0, SEEK_END) < 0) {
ssl_debug_printf("ssl_load_key: can't fseek file\n");
return NULL;
}
if ((size = ftell(fp)) < 0) {
ssl_debug_printf("ssl_load_key: can't ftell file\n");
return NULL;
}
if (fseek(fp, 0, SEEK_SET) < 0) {
ssl_debug_printf("ssl_load_key: can't refseek file\n");
return NULL;
}
key.data = g_malloc(size);
key.size = size;
bytes = fread(key.data, 1, key.size, fp);
if (bytes < key.size) {
ssl_debug_printf("ssl_load_key: can't read from file %d bytes, got %d\n",
key.size, bytes);
return NULL;
}
/* import PEM data*/
if (gnutls_x509_privkey_import(priv_key, &key, GNUTLS_X509_FMT_PEM)!=0) {
ssl_debug_printf("ssl_load_key: can't import pem data\n");
return NULL;
}
free(key.data);
/* RSA get parameter */
if (gnutls_x509_privkey_export_rsa_raw(priv_key, &m, &e, &d, &p, &q, &u) != 0) {
ssl_debug_printf("ssl_load_key: can't export rsa param (is a rsa private key file ?!?)\n");
return NULL;
}
/* convert each rsa parameter to mpi format*/
if (gcry_mpi_scan( &rsa_params[0], GCRYMPI_FMT_USG, m.data, m.size, &tmp_size) !=0) {
ssl_debug_printf("ssl_load_key: can't convert m rsa param to int (size %d)\n", m.size);
return NULL;
}
if (gcry_mpi_scan( &rsa_params[1], GCRYMPI_FMT_USG, e.data, e.size, &tmp_size) != 0) {
ssl_debug_printf("ssl_load_key: can't convert e rsa param to int (size %d)\n", e.size);
return NULL;
}
/*
* note: openssl and gnutls use 'p' and 'q' with opposite meaning:
* our 'p' must be equal to 'q' as provided from openssl and viceversa
*/
if (gcry_mpi_scan( &rsa_params[2], GCRYMPI_FMT_USG, d.data, d.size, &tmp_size) !=0) {
ssl_debug_printf("ssl_load_key: can't convert d rsa param to int (size %d)\n", d.size);
return NULL;
}
if (gcry_mpi_scan( &rsa_params[3], GCRYMPI_FMT_USG, q.data, q.size, &tmp_size) !=0) {
ssl_debug_printf("ssl_load_key: can't convert q rsa param to int (size %d)\n", q.size);
return NULL;
}
if (gcry_mpi_scan( &rsa_params[4], GCRYMPI_FMT_USG, p.data, p.size, &tmp_size) !=0) {
ssl_debug_printf("ssl_load_key: can't convert p rsa param to int (size %d)\n", p.size);
return NULL;
}
if (gcry_mpi_scan( &rsa_params[5], GCRYMPI_FMT_USG, u.data, u.size, &tmp_size) !=0) {
ssl_debug_printf("ssl_load_key: can't convert u rsa param to int (size %d)\n", m.size);
return NULL;
}
ssl_get_version(&major, &minor, &patch);
/* certain versions of gnutls require swap of rsa params 'p' and 'q' */
if ((major <= 1) && (minor <= 0) && (patch <=13))
{
gcry_mpi_t tmp;
ssl_debug_printf("ssl_load_key: swapping p and q parametes\n");
tmp = rsa_params[4];
rsa_params[4] = rsa_params[3];
rsa_params[3] = tmp;
}
if (gcry_sexp_build( &rsa_priv_key, NULL,
"(private-key(rsa((n%m)(e%m)(d%m)(p%m)(q%m)(u%m))))", rsa_params[0],
rsa_params[1], rsa_params[2], rsa_params[3], rsa_params[4],
rsa_params[5]) != 0) {
ssl_debug_printf("ssl_load_key: can't built rsa private key s-exp\n");
return NULL;
}
#if SSL_FAST
return rsa_params;
#else
{
int i;
for (i=0; i< 6; i++)
gcry_mpi_release(rsa_params[i]);
}
return rsa_priv_key;
#endif
}
void ssl_free_key(SSL_PRIVATE_KEY* key)
{
#if SSL_FAST
int i;
for (i=0; i< 6; i++)
gcry_mpi_release(key[i]);
#else
gcry_sexp_release(key);
#endif
}
void
ssl_lib_init(void)
{
gnutls_global_init();
}
#else /* HAVE_LIBGNUTLS */
/* no libgnutl: dummy operation to keep interface consistent*/
void
ssl_lib_init(void)
{
}
SSL_PRIVATE_KEY*
ssl_load_key(FILE* fp)
{
ssl_debug_printf("ssl_load_key: impossible without glutls. fp %p\n",fp);
return NULL;
}
void
ssl_free_key(SSL_PRIVATE_KEY* key _U_)
{
}
int
ssl_find_cipher(int num,SslCipherSuite* cs)
{
ssl_debug_printf("ssl_find_cipher: dummy without glutls. num %d cs %p\n",
num,cs);
return 0;
}
int
ssl_generate_keyring_material(SslDecryptSession*ssl)
{
ssl_debug_printf("ssl_generate_keyring_material: impossible without glutls. ssl %p\n",
ssl);
return 0;
}
int
ssl_decrypt_pre_master_secret(SslDecryptSession* ssl_session,
StringInfo* entrypted_pre_master, SSL_PRIVATE_KEY *pk)
{
ssl_debug_printf("ssl_decrypt_pre_master_secret: impossible without glutls."
" ssl %p entrypted_pre_master %p pk %p\n", ssl_session,
entrypted_pre_master, pk);
return 0;
}
int
ssl_decrypt_record(SslDecryptSession*ssl,SslDecoder* decoder, int ct,
const unsigned char* in, int inl,unsigned char*out,int* outl)
{
ssl_debug_printf("ssl_decrypt_record: impossible without gnutls. ssl %p"
"decoder %p ct %d, in %p inl %d out %p outl %p\n", ssl, decoder, ct,
in, inl, out, outl);
return 0;
}
#endif /* HAVE_LIBGNUTLS */
/* get ssl data for this session. if no ssl data is found allocate a new one*/
void
ssl_session_init(SslDecryptSession* ssl_session)
{
ssl_debug_printf("ssl_session_init: initializing ptr %p size %lu\n",
ssl_session, (unsigned long)sizeof(SslDecryptSession));
ssl_session->master_secret.data = ssl_session->_master_secret;
ssl_session->session_id.data = ssl_session->_session_id;
ssl_session->client_random.data = ssl_session->_client_random;
ssl_session->server_random.data = ssl_session->_server_random;
ssl_session->master_secret.data_len = 48;
}
#ifdef SSL_DECRYPT_DEBUG
static FILE* ssl_debug_file=NULL;
void
ssl_set_debug(char* name)
{
static int debug_file_must_be_closed = 0;
int use_stderr = name?(strcmp(name, SSL_DEBUG_USE_STDERR) == 0):0;
if (debug_file_must_be_closed)
fclose(ssl_debug_file);
if (use_stderr)
ssl_debug_file = stderr;
else if (!name || (strcmp(name, "") ==0))
ssl_debug_file = NULL;
else
ssl_debug_file = fopen(name, "w");
if (!use_stderr && ssl_debug_file)
debug_file_must_be_closed = 1;
}
void
ssl_debug_printf(const char* fmt, ...)
{
va_list ap;
int ret=0;
if (!ssl_debug_file)
return;
va_start(ap, fmt);
ret += vfprintf(ssl_debug_file, fmt, ap);
va_end(ap);
fflush(ssl_debug_file);
}
void
ssl_print_text_data(const char* name, const unsigned char* data, int len)
{
int i;
if (!ssl_debug_file)
return;
fprintf(ssl_debug_file,"%s: ",name);
for (i=0; i< len; i++) {
fprintf(ssl_debug_file,"%c",data[i]);
}
fprintf(ssl_debug_file,"\n");
fflush(ssl_debug_file);
}
void
ssl_print_data(const char* name, const unsigned char* data, int len)
{
int i;
if (!ssl_debug_file)
return;
fprintf(ssl_debug_file,"%s[%d]:\n",name, len);
for (i=0; i< len; i++) {
if ((i>0) && (i%16 == 0))
fprintf(ssl_debug_file,"\n");
fprintf(ssl_debug_file,"%.2x ",data[i]&255);
}
fprintf(ssl_debug_file,"\n");
fflush(ssl_debug_file);
}
void
ssl_print_string(const char* name, const StringInfo* data)
{
ssl_print_data(name, data->data, data->data_len);
}
#endif /* SSL_DECRYPT_DEBUG */
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