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srtp: fix bad memory access

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* fix non-initialized memory at SRTP session creation.
* fix invalid access when SRTP session is free in some conditions.

Change-Id: I95a1e2cd45b8007cb20445ca219f8e667e977656
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>
This commit is contained in:
Guillaume Roguez
2017-07-17 14:25:50 -04:00
committed by Anthony Léonard
parent 5209368768
commit 567d643226
2 changed files with 11 additions and 4 deletions
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3
src/media/socket_pair.cpp
View File

@ -25,6 +25,7 @@
#include "ice_socket.h"
#include "libav_utils.h"
#include "logger.h"
#include "security/memory.h"
#include <iostream>
#include <string>
@ -69,6 +70,8 @@ class SRTPProtoContext {
public:
SRTPProtoContext(const char* out_suite, const char* out_key,
const char* in_suite, const char* in_key) {
ring_secure_memzero(&srtp_out, sizeof(srtp_out));
ring_secure_memzero(&srtp_in, sizeof(srtp_in));
if (out_suite && out_key) {
// XXX: see srtp_open from libavformat/srtpproto.c
if (ff_srtp_set_crypto(&srtp_out, out_suite, out_key) < 0) {

6
src/media/srtp.c
View File

@ -42,10 +42,14 @@ void ff_srtp_free(struct SRTPContext *s)
return;
// aes and hmac have an opaque pointer type.
// No API to safely erase them, so just re-init with "dummy keys" to sanitize them
if (s->aes) {
av_aes_init(s->aes, zero_buffer, 128, 0);
av_hmac_init(s->hmac, zero_buffer, sizeof(s->rtp_auth));
av_freep(&s->aes);
}
if (s->hmac) {
av_hmac_init(s->hmac, zero_buffer, sizeof(s->rtp_auth));
av_hmac_free(s->hmac);
}
ring_secure_memzero(s, sizeof(*s));
}