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Check rng return value when generating COOKIE secret in receiver

This commit is contained in:
Tobias Brunner 2012-06-25 15:55:44 +02:00 committed by Martin Willi
parent 92f207477c
commit 0c096e9bb5
1 changed files with 22 additions and 8 deletions
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30
src/libcharon/network/receiver.c
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@ -322,13 +322,22 @@ static bool drop_ike_sa_init(private_receiver_t *this, message_t *message)
chunk_free(&cookie);
if (++this->secret_used > COOKIE_REUSE)
{
/* create new cookie */
char secret[SECRET_LENGTH];
DBG1(DBG_NET, "generating new cookie secret after %d uses",
this->secret_used);
memcpy(this->secret_old, this->secret, SECRET_LENGTH);
this->rng->get_bytes(this->rng, SECRET_LENGTH, this->secret);
this->secret_switch = now;
this->secret_used = 0;
if (this->rng->get_bytes(this->rng, SECRET_LENGTH, secret))
{
memcpy(this->secret_old, this->secret, SECRET_LENGTH);
memcpy(this->secret, secret, SECRET_LENGTH);
memwipe(secret, SECRET_LENGTH);
this->secret_switch = now;
this->secret_used = 0;
}
else
{
DBG1(DBG_NET, "failed to allocated cookie secret, keeping old");
}
}
return TRUE;
}
@ -540,21 +549,26 @@ receiver_t *receiver_create()
"%s.receive_delay_response", TRUE, charon->name),
this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_PREFERRED);
if (this->hasher == NULL)
if (!this->hasher)
{
DBG1(DBG_NET, "creating cookie hasher failed, no hashers supported");
free(this);
return NULL;
}
this->rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
if (this->rng == NULL)
if (!this->rng)
{
DBG1(DBG_NET, "creating cookie RNG failed, no RNG supported");
this->hasher->destroy(this->hasher);
free(this);
return NULL;
}
this->rng->get_bytes(this->rng, SECRET_LENGTH, this->secret);
if (!this->rng->get_bytes(this->rng, SECRET_LENGTH, this->secret))
{
DBG1(DBG_NET, "creating cookie secret failed");
destroy(this);
return NULL;
}
memcpy(this->secret_old, this->secret, SECRET_LENGTH);
lib->processor->queue_job(lib->processor,