ntlm_check.c

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		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;

		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, lp_iconv_convenience(lp_ctx), CH_DOS, CH_UNIX, 
					  lm_response->data, lm_response->length, 
					   (void **)&unix_pw) != -1)) {
			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, 
					   lp_ctx,
					   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));
		if (smb_pwd_check_ntlmv2(mem_ctx,
					 nt_response, 
					 stored_nt->hash, challenge, 
					 client_username, 
					 client_domain,
					 false,
					 user_sess_key)) {
			*lm_sess_key = *user_sess_key;
			if (user_sess_key->length) {
				lm_sess_key->length = 8;
			}
			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(mem_ctx,
					 nt_response, 
					 stored_nt->hash, challenge, 
					 client_username, 
					 client_domain,
					 true,
					 user_sess_key)) {
			*lm_sess_key = *user_sess_key;
			if (user_sess_key->length) {
				lm_sess_key->length = 8;
			}
			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, 
					 "",
					 false,
					 user_sess_key)) {
			*lm_sess_key = *user_sess_key;
			if (user_sess_key->length) {
				lm_sess_key->length = 8;
			}
			return NT_STATUS_OK;
		} else {
			DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
		}
	} else if (nt_response->length == 24 && stored_nt) {
		if (lp_ntlm_auth(lp_ctx)) {		
			/* 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 (lp_lanman_auth(lp_ctx) && stored_lanman) {
					*lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
				}
				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(lp_ctx)) {
		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 (lp_lanman_auth(lp_ctx) && 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));
	if (smb_pwd_check_ntlmv2(mem_ctx,
				 lm_response, 
				 stored_nt->hash, challenge, 
				 client_username,
				 client_domain,
				 false,
				 &tmp_sess_key)) {
		if (nt_response->length > 24) {
			/* If NTLMv2 authentication has preceeded 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,
					    false,
					    user_sess_key);
		} else {
			/* Otherwise, use the LMv2 session key */
			*user_sess_key = tmp_sess_key;
		}
		*lm_sess_key = *user_sess_key;
		if (user_sess_key->length) {
			lm_sess_key->length = 8;
		}
		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(mem_ctx,
				 lm_response, 
				 stored_nt->hash, challenge, 
				 client_username,
				 client_domain,
				 true,
				 &tmp_sess_key)) {
		if (nt_response->length > 24) {
			/* If NTLMv2 authentication has preceeded 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,
					    true,
					    user_sess_key);
		} else {
			/* Otherwise, use the LMv2 session key */
			*user_sess_key = tmp_sess_key;
		}
		*lm_sess_key = *user_sess_key;
		if (user_sess_key->length) {
			lm_sess_key->length = 8;
		}
		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,
				 "",
				 false,
				 &tmp_sess_key)) {
		if (nt_response->length > 24) {
			/* If NTLMv2 authentication has preceeded 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,
					    "",
					    false,
					    user_sess_key);
		} else {
			/* Otherwise, use the LMv2 session key */
			*user_sess_key = tmp_sess_key;
		}
		*lm_sess_key = *user_sess_key;
		if (user_sess_key->length) {
			lm_sess_key->length = 8;
		}
		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(lp_ctx)) {
		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 (lp_lanman_auth(lp_ctx) && 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;
}