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finished support for extended master secret

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This commit is contained in:
mathewmarcus 2018-06-24 12:37:19 -05:00
parent b4cd538dfa
commit 0d0a0b79b7
3 changed files with 46 additions and 30 deletions
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4
ssl/ssl_h.h
View file

@ -112,10 +112,6 @@ typedef struct decoder_ {
int (*print) PROTO_LIST((ssl_obj *,int direction,segment *seg,Data *data));
} decoder;
typedef struct ssl_extensions_ {
int extended_master_secret;
} ssl_extensions;
#define SSL_NO_DATA 1
#define SSL_BAD_CONTENT_TYPE 2
#define SSL_BAD_PMS 3

69
ssl/ssldecode.c
View file

@ -392,9 +392,10 @@ int ssl_update_handshake_messages(ssl,data)
ssl_obj *ssl;
Data *data;
{
#ifdef OPENSSL
Data *hms;
UCHAR *d;
int l,r,_status;
int l,r;
hms = ssl->decoder->handshake_messages;
d = data->data-4;
@ -402,20 +403,19 @@ int ssl_update_handshake_messages(ssl,data)
if(hms){
if(!(hms->data = realloc(hms->data,l+hms->len)))
ABORT(R_NO_MEMORY);
ERETURN(R_NO_MEMORY);
memcpy(hms->data+hms->len,d,l);
hms->len+=l;
}
else{
if(r=r_data_create(&hms,d,l))
ABORT(r);
ERETURN(r);
ssl->decoder->handshake_messages=hms;
}
#endif
return(0);
_status=0;
abort:
return(_status);
}
static int ssl_create_session_lookup_key(ssl,id,idlen,keyp,keyl)
@ -846,7 +846,7 @@ static int ssl_generate_keying_material(ssl,d)
ssl_obj *ssl;
ssl_decoder *d;
{
Data *key_block=0;
Data *key_block=0,temp;
UCHAR _iv_c[8],_iv_s[8];
UCHAR _key_c[16],_key_s[16];
int needed;
@ -857,8 +857,13 @@ static int ssl_generate_keying_material(ssl,d)
if(r=r_data_alloc(&d->MS,48))
ABORT(r);
if (ssl->extensions->extended_master_secret)
if (ssl->extensions->extended_master_secret) {
ssl_generate_session_hash(ssl,d);
temp.len=0;
if(r=PRF(ssl,d->PMS,"extended master secret",d->session_hash,&temp,
d->MS))
ABORT(r);
}
else
if(r=PRF(ssl,d->PMS,"master secret",d->client_random,d->server_random,
d->MS))
@ -1000,34 +1005,48 @@ static int ssl_generate_keying_material(ssl,d)
static int ssl_generate_session_hash(ssl,d)
ssl_obj *ssl;
ssl_decoder *d;
/* Data **sh; */
{
UCHAR *out[32];
int dgi;
int r,_status,dgi;
unsigned int len;
const EVP_MD *md;
EVP_MD_CTX dgictx;
if(r=r_data_alloc(&d->session_hash,EVP_MAX_MD_SIZE))
ABORT(r);
switch(ssl->version){
case TLSV12_VERSION:
dgi = MAX(DIG_SHA256, ssl->cs->dig)-0x40;
if ((md=EVP_get_digestbyname(digests[dgi])) == NULL) {
DBG((0,"Cannot get EVP for digest %s, openssl library current?",
digests[dgi]));
ERETURN(SSL_BAD_MAC);
}
break;
case TLSV12_VERSION:
dgi = MAX(DIG_SHA256,ssl->cs->dig)-0x40;
if ((md=EVP_get_digestbyname(digests[dgi])) == NULL) {
DBG((0,"Cannot get EVP for digest %s, openssl library current?",
digests[dgi]));
ERETURN(SSL_BAD_MAC);
}
EVP_DigestInit(&dgictx,md);
EVP_DigestUpdate(&dgictx,d->handshake_messages->data,d->handshake_messages->len);
EVP_DigestFinal(&dgictx,d->session_hash->data,&d->session_hash->len);
break;
case SSLV3_VERSION:
case TLSV1_VERSION:
case TLSV11_VERSION:
EVP_DigestInit(&dgictx,EVP_get_digestbyname("MD5"));
EVP_DigestUpdate(&dgictx,d->handshake_messages->data,d->handshake_messages->len);
EVP_DigestFinal_ex(&dgictx,d->session_hash->data,&d->session_hash->len);
EVP_DigestInit(&dgictx,EVP_get_digestbyname("SHA1"));
EVP_DigestUpdate(&dgictx,d->handshake_messages->data,d->handshake_messages->len);
EVP_DigestFinal(&dgictx,d->session_hash->data+d->session_hash->len,&len);
d->session_hash->len+=len;
break;
default:
exit(1);
/* ABORT(SSL_CANT_DO_CIPHER); */
ABORT(SSL_CANT_DO_CIPHER);
}
EVP_DigestInit(&dgictx, md);
EVP_DigestUpdate(&dgictx, d->handshake_messages->data, d->handshake_messages->len);
EVP_DigestFinal(&dgictx, out, &len);
exit(0);
_status=0;
abort:
return(_status);
}
#endif

3
ssl/ssldecode.h
View file

@ -66,7 +66,8 @@ int ssl_process_client_key_exchange PROTO_LIST((struct ssl_obj_ *,
ssl_decoder *d,UCHAR *msg,int len));
int ssl_process_change_cipher_spec PROTO_LIST((ssl_obj *ssl,
ssl_decoder *d,int direction));
int ssl_update_handshake_messages PROTO_LIST((ssl_obj *ssl,
Data *data));
int ssl_decode_record PROTO_LIST((ssl_obj *ssl,ssl_decoder *dec,int direction,
int ct,int version,Data *d));