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Fix bug with libzrtp zrtp_signaling_hash_set() 

The function would silently not accept the imported zrtp-hash-value
with "buffer too small" in the debug output.

Modified-by: Travis Cross <tc@traviscross.com>
Signed-off-by: Travis Cross <tc@traviscross.com>
This commit is contained in:
Viktor Krykun 2012-06-21 11:36:33 +03:00 committed by Travis Cross
parent f311f81b8d
commit 7503d8aafa
4 changed files with 22 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libs/libzrtp/doc/manuals/changelog.dox
View File

@ -34,6 +34,8 @@
***\subsection v120_bugs Bug fixes
*- fixed bug when ZRTP forces enrolled endpoints to re-render SAS when sashash is empty.
*- other minor bug fixes and improvements
*- fixed bug when zrtp_signaling_hash_set() silently not accepted imported zrtp-hash-value with
"buffer too small" debug output.
****************************************************************************************************

9
libs/libzrtp/include/zrtp.h
View File

@ -82,6 +82,9 @@
* \ingroup zrtp_main_init
*/
/** Length of "zrtp-hash-value", RFC 6189 sec 8. @sa zrtp_signaling_hash_get(); */
#define ZRTP_SIGN_ZRTP_HASH_LENGTH (ZRTP_MESSAGE_HASH_SIZE*2)
/**
* \brief Enumeration for ZRTP Licensing modes
* \ingroup zrtp_main_init
@ -798,7 +801,7 @@ zrtp_status_t zrtp_process_srtcp( zrtp_stream_t *stream,
*
* \param stream - stream for operating with;
* \param hash_buff - signaling hash buffer. Function accepts string, not a binary value!;
* \param hash_buff_length - signaling hash length in bytes (must be 64 bytes);
* \param hash_buff_length - signaling hash length in bytes, must be ZRTP_SIGN_ZRTP_HASH_LENGTH bytes;
* \return:
* - zrtp_status_ok if the operation finished successfully
* - one of the errors otherwise
@ -819,8 +822,8 @@ zrtp_status_t zrtp_signaling_hash_set( zrtp_stream_t* stream,
*
* \param stream - stream for operating with
* \param hash_buff - buffer for storing signaling hash. Function returns already parsed hex string.
* String is null-terminated.
* \param hash_buff_length - buffer length in bytes (not shorter than 65 bytes)
* String is null-terminated. Buffer must be at least ZRTP_SIGN_ZRTP_HASH_LENGTH bytes length.
* \param hash_buff_length - buffer length in bytes, non less than ZRTP_SIGN_ZRTP_HASH_LENGTH bytes.
* \return:
* - zrtp_status_ok if the operation finished successfully
* - one of the errors otherwise

26
libs/libzrtp/src/zrtp.c
View File

@ -437,8 +437,6 @@ zrtp_status_t zrtp_stream_attach(zrtp_session_t *session, zrtp_stream_t** stream
ZSTR_SET_EMPTY(new_stream->cc.peer_hmackey);
ZSTR_SET_EMPTY(new_stream->cc.zrtp_key);
ZSTR_SET_EMPTY(new_stream->cc.peer_zrtp_key);
ZSTR_SET_EMPTY(new_stream->messages.signaling_hash);
new_stream->dh_cc.initialized_with = ZRTP_COMP_UNKN;
bnBegin(&new_stream->dh_cc.peer_pv);
@ -466,6 +464,7 @@ zrtp_status_t zrtp_stream_attach(zrtp_session_t *session, zrtp_stream_t** stream
zrtp_memset(&new_stream->messages, 0, sizeof(new_stream->messages));
ZSTR_SET_EMPTY(new_stream->messages.h0);
ZSTR_SET_EMPTY(new_stream->messages.signaling_hash);
/* Generate Random nonce, compute H1 and store in the DH packet */
new_stream->messages.h0.length = (uint16_t)zrtp_randstr( new_stream->zrtp,
@ -595,11 +594,11 @@ zrtp_status_t zrtp_signaling_hash_get( zrtp_stream_t* stream,
zrtp_string32_t hash_str = ZSTR_INIT_EMPTY(hash_str);
zrtp_hash_t *hash = NULL;
if (!stream) {
if (!stream || !hash_buff) {
return zrtp_status_bad_param;
}
if (ZRTP_MESSAGE_HASH_SIZE*2+1 > hash_buff_length) {
if (ZRTP_SIGN_ZRTP_HASH_LENGTH > hash_buff_length) {
return zrtp_status_buffer_size;
}
@ -622,11 +621,11 @@ zrtp_status_t zrtp_signaling_hash_set( zrtp_stream_t* ctx,
const char *hash_buff,
uint32_t hash_buff_length)
{
if (!ctx) {
if (!ctx || !hash_buff) {
return zrtp_status_bad_param;
}
if (ZRTP_MESSAGE_HASH_SIZE*2 < hash_buff_length) {
if (ZRTP_SIGN_ZRTP_HASH_LENGTH > hash_buff_length) {
return zrtp_status_buffer_size;
}
@ -634,17 +633,14 @@ zrtp_status_t zrtp_signaling_hash_set( zrtp_stream_t* ctx,
return zrtp_status_wrong_state;
}
str2hex( hash_buff,
hash_buff_length,
ctx->messages.signaling_hash.buffer,
ctx->messages.signaling_hash.max_length);
str2hex(hash_buff,
ZRTP_SIGN_ZRTP_HASH_LENGTH,
ctx->messages.signaling_hash.buffer,
ctx->messages.signaling_hash.max_length);
ctx->messages.signaling_hash.length = ZRTP_MESSAGE_HASH_SIZE;
{
char buff[64];
ZRTP_LOG(3, (_ZTU_,"SIGNALLING HAS was ADDED for the comparision. ID=%u\n", ctx->id));
ZRTP_LOG(3, (_ZTU_,"Hash=%s.\n", hex2str(hash_buff, hash_buff_length, buff, sizeof(buff))));
}
ZRTP_LOG(3, (_ZTU_,"SIGNALLING HAS was ADDED for the comparison. ID=%u\n", ctx->id));
ZRTP_LOG(3, (_ZTU_,"Hash=%.*s.\n", ZRTP_SIGN_ZRTP_HASH_LENGTH, hash_buff));
return zrtp_status_ok;
}

5
libs/libzrtp/src/zrtp_string.c
View File

@ -113,7 +113,7 @@ const char* hex2str(const char* bin, int bin_size, char* buff, int buff_size)
if (NULL == buff) {
return "buffer is NULL";
}
if (buff_size < bin_size*2+1) {
if (buff_size < bin_size*2) {
return "buffer too small";
}
@ -121,7 +121,8 @@ const char* hex2str(const char* bin, int bin_size, char* buff, int buff_size)
nptr = hex2char(nptr, *bin++);
}
*nptr = 0;
if (buff_size >= bin_size*2+1)
*nptr = 0;
return buff;
}