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EAP-MSCHAPv2: Check hash function results more consistently (CID 68105)

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While the hash functions would be very unlikely to fail in practice,
they do have option of returning an error. Check that return value more
consistently.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-06-14 01:01:18 +03:00
parent b7c61c9d4e
commit 2485835ba3
1 changed files with 21 additions and 12 deletions
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33
src/eap_peer/eap_mschapv2.c
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@ -309,10 +309,13 @@ static void eap_mschapv2_password_changed(struct eap_sm *sm,
} else if (config->flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH) {
config->password = os_malloc(16);
config->password_len = 16;
if (config->password) {
nt_password_hash(config->new_password,
config->new_password_len,
config->password);
if (config->password &&
nt_password_hash(config->new_password,
config->new_password_len,
config->password)) {
os_free(config->password);
config->password = NULL;
config->password_len = 0;
}
os_free(config->new_password);
} else {
@ -549,15 +552,17 @@ static struct wpabuf * eap_mschapv2_change_password(
/* Encrypted-Hash */
if (pwhash) {
u8 new_password_hash[16];
nt_password_hash(new_password, new_password_len,
new_password_hash);
if (nt_password_hash(new_password, new_password_len,
new_password_hash))
goto fail;
nt_password_hash_encrypted_with_block(password,
new_password_hash,
cp->encr_hash);
} else {
old_nt_password_hash_encrypted_with_new_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_hash);
if (old_nt_password_hash_encrypted_with_new_nt_password_hash(
new_password, new_password_len,
password, password_len, cp->encr_hash))
goto fail;
}
/* Peer-Challenge */
@ -594,9 +599,13 @@ static struct wpabuf * eap_mschapv2_change_password(
/* Likewise, generate master_key here since we have the needed data
* available. */
nt_password_hash(new_password, new_password_len, password_hash);
hash_nt_password_hash(password_hash, password_hash_hash);
get_master_key(password_hash_hash, cp->nt_response, data->master_key);
if (nt_password_hash(new_password, new_password_len, password_hash) ||
hash_nt_password_hash(password_hash, password_hash_hash) ||
get_master_key(password_hash_hash, cp->nt_response,
data->master_key)) {
data->auth_response_valid = 0;
goto fail;
}
data->master_key_valid = 1;
/* Flags */