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Unix SMB/CIFS implementation.
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Password and authentication handling
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Copyright (C) Andrew Tridgell 1992-2000
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Copyright (C) Luke Kenneth Casson Leighton 1996-2000
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Copyright (C) Andrew Bartlett 2001-2003
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Copyright (C) Gerald Carter 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#define DBGC_CLASS DBGC_AUTH
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/****************************************************************************
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Core of smb password checking routine.
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****************************************************************************/
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static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
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const uchar *part_passwd,
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const DATA_BLOB *sec_blob,
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DATA_BLOB *user_sess_key)
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/* Finish the encryption of part_passwd. */
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if (part_passwd == NULL) {
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DEBUG(10,("No password set - DISALLOWING access\n"));
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/* No password set - always false ! */
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if (sec_blob->length != 8) {
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DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n",
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(unsigned long)sec_blob->length));
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if (nt_response->length != 24) {
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DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n",
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(unsigned long)nt_response->length));
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SMBOWFencrypt(part_passwd, sec_blob->data, p24);
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if (user_sess_key != NULL) {
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*user_sess_key = data_blob(NULL, 16);
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SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
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DEBUG(100,("Part password (P16) was |\n"));
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dump_data(100, (const char *)part_passwd, 16);
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DEBUGADD(100,("Password from client was |\n"));
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dump_data(100, (const char *)nt_response->data, nt_response->length);
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DEBUGADD(100,("Given challenge was |\n"));
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dump_data(100, (const char *)sec_blob->data, sec_blob->length);
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DEBUGADD(100,("Value from encryption was |\n"));
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dump_data(100, (const char *)p24, 24);
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return (memcmp(p24, nt_response->data, 24) == 0);
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/****************************************************************************
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Core of smb password checking routine. (NTLMv2, LMv2)
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Note: The same code works with both NTLMv2 and LMv2.
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****************************************************************************/
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static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
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const uchar *part_passwd,
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const DATA_BLOB *sec_blob,
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const char *user, const char *domain,
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BOOL upper_case_domain, /* should the domain be transformed into upper case? */
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DATA_BLOB *user_sess_key)
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/* Finish the encryption of part_passwd. */
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uchar value_from_encryption[16];
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uchar client_response[16];
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DATA_BLOB client_key_data;
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if (part_passwd == NULL) {
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DEBUG(10,("No password set - DISALLOWING access\n"));
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/* No password set - always False */
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if (sec_blob->length != 8) {
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DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n",
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(unsigned long)sec_blob->length));
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if (ntv2_response->length < 24) {
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/* We MUST have more than 16 bytes, or the stuff below will go
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crazy. No known implementation sends less than the 24 bytes
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for LMv2, let alone NTLMv2. */
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DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
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(unsigned long)ntv2_response->length));
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client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
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todo: should we be checking this for anything? We can't for LMv2,
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but for NTLMv2 it is meant to contain the current time etc.
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memcpy(client_response, ntv2_response->data, sizeof(client_response));
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if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
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SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
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if (user_sess_key != NULL) {
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*user_sess_key = data_blob(NULL, 16);
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SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
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DEBUG(100,("Part password (P16) was |\n"));
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dump_data(100, (const char *)part_passwd, 16);
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DEBUGADD(100,("Password from client was |\n"));
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dump_data(100, (const char *)ntv2_response->data, ntv2_response->length);
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DEBUGADD(100,("Variable data from client was |\n"));
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dump_data(100, (const char *)client_key_data.data, client_key_data.length);
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DEBUGADD(100,("Given challenge was |\n"));
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dump_data(100, (const char *)sec_blob->data, sec_blob->length);
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DEBUGADD(100,("Value from encryption was |\n"));
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dump_data(100, (const char *)value_from_encryption, 16);
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data_blob_clear_free(&client_key_data);
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res = (memcmp(value_from_encryption, client_response, 16) == 0);
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if ((!res) && (user_sess_key != NULL))
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data_blob_clear_free(user_sess_key);
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* Check a challenge-response password against the value of the NT or
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* @param mem_ctx talloc context
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* @param challenge 8-byte challenge. If all zero, forces plaintext comparison
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* @param nt_response 'unicode' NT response to the challenge, or unicode password
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* @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
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* @param username internal Samba username, for log messages
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* @param client_username username the client used
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* @param client_domain domain name the client used (may be mapped)
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* @param nt_pw MD4 unicode password from our passdb or similar
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* @param lm_pw LANMAN ASCII password from our passdb or similar
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* @param user_sess_key User session key
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* @param lm_sess_key LM session key (first 8 bytes of the LM hash)
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NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
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const DATA_BLOB *challenge,
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const DATA_BLOB *lm_response,
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const DATA_BLOB *nt_response,
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const DATA_BLOB *lm_interactive_pwd,
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const DATA_BLOB *nt_interactive_pwd,
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const char *username,
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const char *client_username,
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const char *client_domain,
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const uint8 *lm_pw, const uint8 *nt_pw,
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DATA_BLOB *user_sess_key,
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DATA_BLOB *lm_sess_key)
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static const unsigned char zeros[8];
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DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
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if (nt_interactive_pwd && nt_interactive_pwd->length && nt_pw) {
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if (nt_interactive_pwd->length != 16) {
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DEBUG(3,("ntlm_password_check: Interactive logon: Invalid NT password length (%d) supplied for user %s\n", (int)nt_interactive_pwd->length,
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return NT_STATUS_WRONG_PASSWORD;
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if (memcmp(nt_interactive_pwd->data, nt_pw, 16) == 0) {
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*user_sess_key = data_blob(NULL, 16);
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SMBsesskeygen_ntv1(nt_pw, NULL, user_sess_key->data);
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DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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} else if (lm_interactive_pwd && lm_interactive_pwd->length && lm_pw) {
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if (lm_interactive_pwd->length != 16) {
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DEBUG(3,("ntlm_password_check: Interactive logon: Invalid LANMAN password length (%d) supplied for user %s\n", (int)lm_interactive_pwd->length,
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return NT_STATUS_WRONG_PASSWORD;
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if (!lp_lanman_auth()) {
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DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
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return NT_STATUS_WRONG_PASSWORD;
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if (memcmp(lm_interactive_pwd->data, lm_pw, 16) == 0) {
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DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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/* Check for cleartext netlogon. Used by Exchange 5.5. */
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if (challenge->length == sizeof(zeros) &&
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(memcmp(challenge->data, zeros, challenge->length) == 0 )) {
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DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
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if (nt_pw && nt_response->length) {
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unsigned char pwhash[16];
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mdfour(pwhash, nt_response->data, nt_response->length);
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if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
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DEBUG(3,("ntlm_password_check: NT (Unicode) plaintext password check failed for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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} else if (!lp_lanman_auth()) {
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DEBUG(3,("ntlm_password_check: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
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} else if (lm_pw && lm_response->length) {
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memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
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/* Only the fisrt 14 chars are considered, password need not be null terminated. */
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/* we *might* need to upper-case the string here */
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E_P16((const unsigned char *)dospwd, p16);
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if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
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DEBUG(3,("ntlm_password_check: LANMAN (ASCII) plaintext password check failed for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
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return NT_STATUS_WRONG_PASSWORD;
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if (nt_response->length != 0 && nt_response->length < 24) {
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DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
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(unsigned long)nt_response->length, username));
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if (nt_response->length >= 24 && nt_pw) {
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if (nt_response->length > 24) {
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/* We have the NT MD4 hash challenge available - see if we can
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DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
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if (smb_pwd_check_ntlmv2( nt_response,
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DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
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if (smb_pwd_check_ntlmv2( nt_response,
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DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
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if (smb_pwd_check_ntlmv2( nt_response,
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DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
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return NT_STATUS_WRONG_PASSWORD;
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if (lp_ntlm_auth()) {
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/* We have the NT MD4 hash challenge available - see if we can
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use it (ie. does it exist in the smbpasswd file).
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DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
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if (smb_pwd_check_ntlmv1(nt_response,
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/* The LM session key for this response is not very secure,
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so use it only if we otherwise allow LM authentication */
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if (lp_lanman_auth() && lm_pw) {
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uint8 first_8_lm_hash[16];
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memcpy(first_8_lm_hash, lm_pw, 8);
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memset(first_8_lm_hash + 8, '\0', 8);
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*lm_sess_key = data_blob(first_8_lm_hash, 16);
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DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
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/* no return, becouse we might pick up LMv2 in the LM field */
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if (lm_response->length == 0) {
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DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
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return NT_STATUS_WRONG_PASSWORD;
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if (lm_response->length < 24) {
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DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
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(unsigned long)nt_response->length, username));
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return NT_STATUS_WRONG_PASSWORD;
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if (!lp_lanman_auth()) {
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DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
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DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
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DEBUG(4,("ntlm_password_check: Checking LM password\n"));
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if (smb_pwd_check_ntlmv1(lm_response,
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uint8 first_8_lm_hash[16];
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memcpy(first_8_lm_hash, lm_pw, 8);
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memset(first_8_lm_hash + 8, '\0', 8);
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*user_sess_key = data_blob(first_8_lm_hash, 16);
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*lm_sess_key = data_blob(first_8_lm_hash, 16);
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DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
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return NT_STATUS_WRONG_PASSWORD;
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/* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
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- related to Win9X, legacy NAS pass-though authentication
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DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
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if (smb_pwd_check_ntlmv2( lm_response,
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DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
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if (smb_pwd_check_ntlmv2( lm_response,
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DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
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if (smb_pwd_check_ntlmv2( lm_response,
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/* Apparently NT accepts NT responses in the LM field
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- I think this is related to Win9X pass-though authentication
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DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
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if (lp_ntlm_auth()) {
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if (smb_pwd_check_ntlmv1(lm_response,
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/* The session key for this response is still very odd.
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It not very secure, so use it only if we otherwise
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allow LM authentication */
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if (lp_lanman_auth() && lm_pw) {
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uint8 first_8_lm_hash[16];
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memcpy(first_8_lm_hash, lm_pw, 8);
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memset(first_8_lm_hash + 8, '\0', 8);
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*user_sess_key = data_blob(first_8_lm_hash, 16);
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*lm_sess_key = data_blob(first_8_lm_hash, 16);
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DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
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DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
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return NT_STATUS_WRONG_PASSWORD;
added
removed
source/libsmb/ntlm_check.c
