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crypto: Process des_encrypt() error returns in callers

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This updates all the des_encrypt() callers to handle error cases.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2017-02-28 11:11:12 +02:00
parent 5f0e165e80
commit b41d3e0a75
6 changed files with 61 additions and 41 deletions
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39
src/crypto/ms_funcs.c
View file

@ -140,17 +140,20 @@ int hash_nt_password_hash(const u8 *password_hash, u8 *password_hash_hash)
* @challenge: 8-octet Challenge (IN)
* @password_hash: 16-octet PasswordHash (IN)
* @response: 24-octet Response (OUT)
* Returns: 0 on success, -1 on failure
*/
void challenge_response(const u8 *challenge, const u8 *password_hash,
int challenge_response(const u8 *challenge, const u8 *password_hash,
u8 *response)
{
u8 zpwd[7];
des_encrypt(challenge, password_hash, response);
des_encrypt(challenge, password_hash + 7, response + 8);
if (des_encrypt(challenge, password_hash, response) < 0 ||
des_encrypt(challenge, password_hash + 7, response + 8) < 0)
return -1;
zpwd[0] = password_hash[14];
zpwd[1] = password_hash[15];
os_memset(zpwd + 2, 0, 5);
des_encrypt(challenge, zpwd, response + 16);
return des_encrypt(challenge, zpwd, response + 16);
}
@ -175,9 +178,9 @@ int generate_nt_response(const u8 *auth_challenge, const u8 *peer_challenge,
if (challenge_hash(peer_challenge, auth_challenge, username,
username_len, challenge) ||
nt_password_hash(password, password_len, password_hash))
nt_password_hash(password, password_len, password_hash) ||
challenge_response(challenge, password_hash, response))
return -1;
challenge_response(challenge, password_hash, response);
return 0;
}
@ -202,9 +205,9 @@ int generate_nt_response_pwhash(const u8 *auth_challenge,
if (challenge_hash(peer_challenge, auth_challenge,
username, username_len,
challenge))
challenge) ||
challenge_response(challenge, password_hash, response))
return -1;
challenge_response(challenge, password_hash, response);
return 0;
}
@ -304,9 +307,10 @@ int nt_challenge_response(const u8 *challenge, const u8 *password,
size_t password_len, u8 *response)
{
u8 password_hash[16];
if (nt_password_hash(password, password_len, password_hash))
if (nt_password_hash(password, password_len, password_hash) ||
challenge_response(challenge, password_hash, response))
return -1;
challenge_response(challenge, password_hash, response);
return 0;
}
@ -487,12 +491,15 @@ int new_password_encrypted_with_old_nt_password_hash(
* @password_hash: 16-octer PasswordHash (IN)
* @block: 16-octet Block (IN)
* @cypher: 16-octer Cypher (OUT)
* Returns: 0 on success, -1 on failure
*/
void nt_password_hash_encrypted_with_block(const u8 *password_hash,
int nt_password_hash_encrypted_with_block(const u8 *password_hash,
const u8 *block, u8 *cypher)
{
des_encrypt(password_hash, block, cypher);
des_encrypt(password_hash + 8, block + 7, cypher + 8);
if (des_encrypt(password_hash, block, cypher) < 0 ||
des_encrypt(password_hash + 8, block + 7, cypher + 8) < 0)
return -1;
return 0;
}
@ -515,10 +522,10 @@ int old_nt_password_hash_encrypted_with_new_nt_password_hash(
if (nt_password_hash(old_password, old_password_len,
old_password_hash) ||
nt_password_hash(new_password, new_password_len,
new_password_hash))
return -1;
new_password_hash) ||
nt_password_hash_encrypted_with_block(old_password_hash,
new_password_hash,
encrypted_password_hash);
encrypted_password_hash))
return -1;
return 0;
}

4
src/crypto/ms_funcs.h
View file

@ -31,7 +31,7 @@ int generate_authenticator_response_pwhash(
int nt_challenge_response(const u8 *challenge, const u8 *password,
size_t password_len, u8 *response);
void challenge_response(const u8 *challenge, const u8 *password_hash,
int challenge_response(const u8 *challenge, const u8 *password_hash,
u8 *response);
int challenge_hash(const u8 *peer_challenge, const u8 *auth_challenge,
const u8 *username, size_t username_len, u8 *challenge);
@ -50,7 +50,7 @@ int __must_check new_password_encrypted_with_old_nt_password_hash(
const u8 *new_password, size_t new_password_len,
const u8 *old_password, size_t old_password_len,
u8 *encrypted_pw_block);
void nt_password_hash_encrypted_with_block(const u8 *password_hash,
int nt_password_hash_encrypted_with_block(const u8 *password_hash,
const u8 *block, u8 *cypher);
int old_nt_password_hash_encrypted_with_new_nt_password_hash(
const u8 *new_password, size_t new_password_len,

16
src/eap_peer/eap_leap.c
View file

@ -115,10 +115,13 @@ static struct wpabuf * eap_leap_process_request(struct eap_sm *sm, void *priv,
wpabuf_put_u8(resp, 0); /* unused */
wpabuf_put_u8(resp, LEAP_RESPONSE_LEN);
rpos = wpabuf_put(resp, LEAP_RESPONSE_LEN);
if (pwhash)
challenge_response(challenge, password, rpos);
else
nt_challenge_response(challenge, password, password_len, rpos);
if ((pwhash && challenge_response(challenge, password, rpos)) ||
(!pwhash &&
nt_challenge_response(challenge, password, password_len, rpos))) {
wpa_printf(MSG_DEBUG, "EAP-LEAP: Failed to derive response");
ret->ignore = TRUE;
return NULL;
}
os_memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
rpos, LEAP_RESPONSE_LEN);
@ -239,7 +242,10 @@ static struct wpabuf * eap_leap_process_response(struct eap_sm *sm, void *priv,
return NULL;
}
}
challenge_response(data->ap_challenge, pw_hash_hash, expected);
if (challenge_response(data->ap_challenge, pw_hash_hash, expected)) {
ret->ignore = TRUE;
return NULL;
}
ret->methodState = METHOD_DONE;
ret->allowNotifications = FALSE;

6
src/eap_peer/eap_mschapv2.c
View file

@ -567,11 +567,11 @@ static struct wpabuf * eap_mschapv2_change_password(
if (pwhash) {
u8 new_password_hash[16];
if (nt_password_hash(new_password, new_password_len,
new_password_hash))
goto fail;
new_password_hash) ||
nt_password_hash_encrypted_with_block(password,
new_password_hash,
cp->encr_hash);
cp->encr_hash))
goto fail;
} else {
if (old_nt_password_hash_encrypted_with_new_nt_password_hash(
new_password, new_password_len,

10
src/eap_peer/eap_ttls.c
View file

@ -624,12 +624,16 @@ static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
os_memset(pos, 0, 24); /* LM-Response */
pos += 24;
if (pwhash) {
challenge_response(challenge, password, pos); /* NT-Response */
/* NT-Response */
if (challenge_response(challenge, password, pos))
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
password, 16);
} else {
nt_challenge_response(challenge, password, password_len,
pos); /* NT-Response */
/* NT-Response */
if (nt_challenge_response(challenge, password, password_len,
pos))
return -1;
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
password, password_len);
}

11
src/eap_server/eap_server_ttls.c
View file

@ -666,11 +666,14 @@ static void eap_ttls_process_phase2_mschap(struct eap_sm *sm,
}
os_free(chal);
if (sm->user->password_hash)
challenge_response(challenge, sm->user->password, nt_response);
else
if ((sm->user->password_hash &&
challenge_response(challenge, sm->user->password, nt_response)) ||
(!sm->user->password_hash &&
nt_challenge_response(challenge, sm->user->password,
sm->user->password_len, nt_response);
sm->user->password_len, nt_response))) {
eap_ttls_state(data, FAILURE);
return;
}
if (os_memcmp_const(nt_response, response + 2 + 24, 24) == 0) {
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");