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Check rng return value when generating secrets and IVs in libtls

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This commit is contained in:
Tobias Brunner
2012-07-16 14:53:37 +02:00
committed by Martin Willi
parent e59f983160
commit 126eb2af59
3 changed files with 20 additions and 16 deletions
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src/libtls/tls_peer.c
+8 -6
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@@ -709,13 +709,15 @@ static status_t send_client_hello(private_tls_peer_t *this,
htoun32(&this->client_random, time(NULL));
rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
if (!rng)
if (!rng ||
!rng->get_bytes(rng, sizeof(this->client_random) - 4,
this->client_random + 4))
{
DBG1(DBG_TLS, "no suitable RNG found to generate client random");
DBG1(DBG_TLS, "failed to generate client random");
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
DESTROY_IF(rng);
return NEED_MORE;
}
rng->get_bytes(rng, sizeof(this->client_random) - 4, this->client_random + 4);
rng->destroy(rng);
/* TLS version */
@@ -903,13 +905,13 @@ static status_t send_key_exchange_encrypt(private_tls_peer_t *this,
chunk_t encrypted;
rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
if (!rng)
if (!rng || !rng->get_bytes(rng, sizeof(premaster) - 2, premaster + 2))
{
DBG1(DBG_TLS, "no suitable RNG found for TLS premaster secret");
DBG1(DBG_TLS, "failed to generate TLS premaster secret");
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
DESTROY_IF(rng);
return NEED_MORE;
}
rng->get_bytes(rng, sizeof(premaster) - 2, premaster + 2);
rng->destroy(rng);
htoun16(premaster, TLS_1_2);