NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
bool lanman_auth,
bool ntlm_auth,
uint32_t logon_parameters,
const DATA_BLOB *challenge,
const DATA_BLOB *lm_response,
const DATA_BLOB *nt_response,
const char *username,
const char *client_username,
const char *client_domain,
const struct samr_Password *stored_lanman,
const struct samr_Password *stored_nt,
DATA_BLOB *user_sess_key,
DATA_BLOB *lm_sess_key)
{
const static uint8_t zeros[8];
DATA_BLOB tmp_sess_key;
const char *upper_client_domain = NULL;
if (client_domain != NULL) {
upper_client_domain = talloc_strdup_upper(mem_ctx, client_domain);
if (upper_client_domain == NULL) {
return NT_STATUS_NO_MEMORY;
}
}
if (stored_nt == NULL) {
DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
username));
}
*lm_sess_key = data_blob(NULL, 0);
*user_sess_key = data_blob(NULL, 0);
/* Check for cleartext netlogon. Used by Exchange 5.5. */
if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
&& challenge->length == sizeof(zeros)
&& (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
struct samr_Password client_nt;
struct samr_Password client_lm;
char *unix_pw = NULL;
bool lm_ok;
size_t converted_size = 0;
DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
username));
mdfour(client_nt.hash, nt_response->data, nt_response->length);
if (lm_response->length &&
(convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
lm_response->data, lm_response->length,
(void *)&unix_pw, &converted_size))) {
if (E_deshash(unix_pw, client_lm.hash)) {
lm_ok = true;
} else {
lm_ok = false;
}
} else {
lm_ok = false;
}
return hash_password_check(mem_ctx,
lanman_auth,
lm_ok ? &client_lm : NULL,
nt_response->length ? &client_nt : NULL,
username,
stored_lanman, stored_nt);
}
if (nt_response->length != 0 && nt_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
}
if (nt_response->length > 24 && stored_nt) {
/* We have the NT MD4 hash challenge available - see if we can
use it
*/
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n",
client_domain ? client_domain : "<NULL>"));
if (smb_pwd_check_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
client_domain,
user_sess_key)) {
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n",
upper_client_domain ? upper_client_domain : "<NULL>"));
if (smb_pwd_check_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
upper_client_domain,
user_sess_key)) {
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
"",
user_sess_key)) {
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
}
} else if (nt_response->length == 24 && stored_nt) {
if (ntlm_auth) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
if (smb_pwd_check_ntlmv1(mem_ctx,
nt_response,
stored_nt->hash, challenge,
user_sess_key)) {
/* The LM session key for this response is not very secure,
so use it only if we otherwise allow LM authentication */
if (lanman_auth && stored_lanman) {
*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
username));
/* no return, because we might pick up LMv2 in the LM field */
}
}
if (lm_response->length == 0) {
DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (lm_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
return NT_STATUS_WRONG_PASSWORD;
}
if (!lanman_auth) {
DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
username));
} else if (!stored_lanman) {
DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
username));
} else if (strchr_m(username, '@')) {
DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
username));
} else {
DEBUG(4,("ntlm_password_check: Checking LM password\n"));
if (smb_pwd_check_ntlmv1(mem_ctx,
lm_response,
stored_lanman->hash, challenge,
NULL)) {
/* The session key for this response is still very odd.
It not very secure, so use it only if we otherwise
allow LM authentication */
if (lanman_auth && stored_lanman) {
uint8_t first_8_lm_hash[16];
memcpy(first_8_lm_hash, stored_lanman->hash, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
}
return NT_STATUS_OK;
}
}
if (!stored_nt) {
DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
return NT_STATUS_WRONG_PASSWORD;
}
/* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
- related to Win9X, legacy NAS pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n",
client_domain ? client_domain : "<NULL>"));
if (smb_pwd_check_ntlmv2(mem_ctx,
lm_response,
stored_nt->hash, challenge,
client_username,
client_domain,
&tmp_sess_key)) {
if (nt_response->length > 24) {
/* If NTLMv2 authentication has preceded us
* (even if it failed), then use the session
* key from that. See the RPC-SAMLOGON
* torture test */
smb_sess_key_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
client_domain,
user_sess_key);
} else {
/* Otherwise, use the LMv2 session key */
*user_sess_key = tmp_sess_key;
}
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n",
upper_client_domain ? upper_client_domain : "<NULL>"));
if (smb_pwd_check_ntlmv2(mem_ctx,
lm_response,
stored_nt->hash, challenge,
client_username,
upper_client_domain,
&tmp_sess_key)) {
if (nt_response->length > 24) {
/* If NTLMv2 authentication has preceded us
* (even if it failed), then use the session
* key from that. See the RPC-SAMLOGON
* torture test */
smb_sess_key_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
upper_client_domain,
user_sess_key);
} else {
/* Otherwise, use the LMv2 session key */
*user_sess_key = tmp_sess_key;
}
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2(mem_ctx,
lm_response,
stored_nt->hash, challenge,
client_username,
"",
&tmp_sess_key)) {
if (nt_response->length > 24) {
/* If NTLMv2 authentication has preceded us
* (even if it failed), then use the session
* key from that. See the RPC-SAMLOGON
* torture test */
smb_sess_key_ntlmv2(mem_ctx,
nt_response,
stored_nt->hash, challenge,
client_username,
"",
user_sess_key);
} else {
/* Otherwise, use the LMv2 session key */
*user_sess_key = tmp_sess_key;
}
if (user_sess_key->length) {
*lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
}
return NT_STATUS_OK;
}
/* Apparently NT accepts NT responses in the LM field
- I think this is related to Win9X pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
if (ntlm_auth) {
if (smb_pwd_check_ntlmv1(mem_ctx,
lm_response,
stored_nt->hash, challenge,
NULL)) {
/* The session key for this response is still very odd.
It not very secure, so use it only if we otherwise
allow LM authentication */
if (lanman_auth && stored_lanman) {
uint8_t first_8_lm_hash[16];
memcpy(first_8_lm_hash, stored_lanman->hash, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
}
return NT_STATUS_OK;
}
DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
} else {
DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
}
/* Try and match error codes */
if (strchr_m(username, '@')) {
return NT_STATUS_NOT_FOUND;
}
return NT_STATUS_WRONG_PASSWORD;
}
NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
const DATA_BLOB *challenge,
const DATA_BLOB *lm_response,
const DATA_BLOB *nt_response,
const DATA_BLOB *lm_interactive_pwd,
const DATA_BLOB *nt_interactive_pwd,
const char *username,
const char *client_username,
const char *client_domain,
const uint8 *lm_pw, const uint8 *nt_pw,
DATA_BLOB *user_sess_key,
DATA_BLOB *lm_sess_key)
{
static const unsigned char zeros[8];
if (nt_pw == NULL) {
DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
username));
}
if (nt_interactive_pwd && nt_interactive_pwd->length && nt_pw) {
if (nt_interactive_pwd->length != 16) {
DEBUG(3,("ntlm_password_check: Interactive logon: Invalid NT password length (%d) supplied for user %s\n", (int)nt_interactive_pwd->length,
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (memcmp(nt_interactive_pwd->data, nt_pw, 16) == 0) {
if (user_sess_key) {
*user_sess_key = data_blob(NULL, 16);
SMBsesskeygen_ntv1(nt_pw, NULL, user_sess_key->data);
}
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else if (lm_interactive_pwd && lm_interactive_pwd->length && lm_pw) {
if (lm_interactive_pwd->length != 16) {
DEBUG(3,("ntlm_password_check: Interactive logon: Invalid LANMAN password length (%d) supplied for user %s\n", (int)lm_interactive_pwd->length,
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (!lp_lanman_auth()) {
DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (memcmp(lm_interactive_pwd->data, lm_pw, 16) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
}
/* Check for cleartext netlogon. Used by Exchange 5.5. */
if (challenge->length == sizeof(zeros) &&
(memcmp(challenge->data, zeros, challenge->length) == 0 )) {
DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
username));
if (nt_pw && nt_response->length) {
unsigned char pwhash[16];
mdfour(pwhash, nt_response->data, nt_response->length);
if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NT (Unicode) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else if (!lp_lanman_auth()) {
DEBUG(3,("ntlm_password_check: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
username));
} else if (lm_pw && lm_response->length) {
uchar dospwd[14];
uchar p16[16];
ZERO_STRUCT(dospwd);
memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
/* Only the fisrt 14 chars are considered, password need not be null terminated. */
/* we *might* need to upper-case the string here */
E_P16((const unsigned char *)dospwd, p16);
if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: LANMAN (ASCII) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (nt_response->length != 0 && nt_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
}
if (nt_response->length >= 24 && nt_pw) {
if (nt_response->length > 24) {
/* We have the NT MD4 hash challenge available - see if we can
use it
*/
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
client_domain,
False,
user_sess_key)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
client_domain,
True,
user_sess_key)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
"",
False,
user_sess_key)) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (lp_ntlm_auth()) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
if (smb_pwd_check_ntlmv1(nt_response,
nt_pw, challenge,
user_sess_key)) {
/* The LM session key for this response is not very secure,
so use it only if we otherwise allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
if (lm_sess_key) {
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
}
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
username));
/* no return, becouse we might pick up LMv2 in the LM field */
}
}
if (lm_response->length == 0) {
DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (lm_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
return NT_STATUS_WRONG_PASSWORD;
}
if (!lp_lanman_auth()) {
DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
username));
} else if (!lm_pw) {
DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
username));
} else {
DEBUG(4,("ntlm_password_check: Checking LM password\n"));
if (smb_pwd_check_ntlmv1(lm_response,
lm_pw, challenge,
NULL)) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
if (user_sess_key) {
*user_sess_key = data_blob(first_8_lm_hash, 16);
}
if (lm_sess_key) {
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
return NT_STATUS_OK;
}
}
if (!nt_pw) {
DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
return NT_STATUS_WRONG_PASSWORD;
}
/* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
- related to Win9X, legacy NAS pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
client_domain,
False,
NULL)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
client_domain,
True,
NULL)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
"",
False,
NULL)) {
return NT_STATUS_OK;
}
/* Apparently NT accepts NT responses in the LM field
- I think this is related to Win9X pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
if (lp_ntlm_auth()) {
if (smb_pwd_check_ntlmv1(lm_response,
nt_pw, challenge,
NULL)) {
/* The session key for this response is still very odd.
It not very secure, so use it only if we otherwise
allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
if (user_sess_key) {
*user_sess_key = data_blob(first_8_lm_hash, 16);
}
if (lm_sess_key) {
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
}
return NT_STATUS_OK;
}
DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
} else {
DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
}
return NT_STATUS_WRONG_PASSWORD;
}
