auth.c

radius server在linux下的源码

		}

		/*
		 *	Challenges are punted back to the NAS
		 *	without any further processing.
		 */
		if (request->proxy_reply->code == PW_ACCESS_CHALLENGE) {
			request->reply->code = PW_ACCESS_CHALLENGE;
			return RLM_MODULE_HANDLED;
		}

		/*
		 *	Reply of ACCEPT means accept, ALL other
		 *	replies mean reject.  This is fail-safe.
		 */
		if (request->proxy_reply->code == PW_AUTHENTICATION_ACK)
			tmp->lvalue = PW_AUTHTYPE_ACCEPT;
		else
			tmp->lvalue = PW_AUTHTYPE_REJECT;
		pairadd(&request->config_items, tmp);

		/*
		 *	If it's an Access-Reject, then do NOT do any
		 *	authorization or authentication.  They're being
		 *	rejected, so we minimize the amount of work
		 *	done by the server, by rejecting them here.
		 */
		if ((request->proxy_reply->code != PW_AUTHENTICATION_ACK) &&
		    (request->proxy_reply->code != PW_ACCESS_CHALLENGE)) {
			rad_authlog("Login incorrect (Home Server says so)", request, 0);
			request->reply->code = PW_AUTHENTICATION_REJECT;
			rad_postauth_reject(request);
			return RLM_MODULE_REJECT;
		}
	}

	/*
	 *	Get the username from the request.
	 *
	 *	Note that namepair MAY be NULL, in which case there
	 *	is no User-Name attribute in the request.
	 */
	namepair = request->username;

	/*
	 *	Look for, and cache, passwords.
	 */
	if (!request->password) {
		request->password = pairfind(request->packet->vps,
					     PW_PASSWORD);
	}

	/*
	 *	Discover which password we want to use.
	 */
	auth_item = request->password;
	if (auth_item) {
		password = (const char *)auth_item->strvalue;

	} else {
		/*
		 *	Maybe there's a CHAP-Password?
		 */
		if ((auth_item = pairfind(request->packet->vps,
				PW_CHAP_PASSWORD)) != NULL) {
			password = "<CHAP-PASSWORD>";

		} else {
			/*
			 *	No password we recognize.
			 */
			password = "<NO-PASSWORD>";
		}
	}
	request->password = auth_item;

	/*
	 *	Get the user's authorization information from the database
	 */
autz_redo:
	r = module_authorize(autz_type, request);
	if (r != RLM_MODULE_NOTFOUND &&
	    r != RLM_MODULE_NOOP &&
	    r != RLM_MODULE_OK &&
	    r != RLM_MODULE_UPDATED) {
		if (r != RLM_MODULE_FAIL && r != RLM_MODULE_HANDLED) {
			if ((module_msg = pairfind(request->packet->vps,
					PW_MODULE_FAILURE_MESSAGE)) != NULL){
				char msg[MAX_STRING_LEN+16];
				snprintf(msg, sizeof(msg), "Invalid user (%s)",
					 module_msg->strvalue);
				rad_authlog(msg,request,0);
			} else {
				rad_authlog("Invalid user", request, 0);
			}
			request->reply->code = PW_AUTHENTICATION_REJECT;
		}
		return r;
	}
	if (!autz_retry){
		VALUE_PAIR	*autz_type_item = NULL;
		autz_type_item = pairfind(request->config_items, PW_AUTZ_TYPE);
		if (autz_type_item){
			autz_type = autz_type_item->lvalue;
			autz_retry = 1;
			goto autz_redo;
		}
	}

	/*
	 *	If we haven't already proxied the packet, then check
	 *	to see if we should.  Maybe one of the authorize
	 *	modules has decided that a proxy should be used. If
	 *	so, get out of here and send the packet.
	 */
	if ((request->proxy == NULL) &&
	    ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM)) != NULL)) {
		REALM *realm;

		/*
		 *	Catch users who set Proxy-To-Realm to a LOCAL
		 *	realm (sigh).
		 */
		realm = realm_find(tmp->strvalue, 0);
		if (realm && (realm->ipaddr == htonl(INADDR_NONE))) {
			DEBUG2("  WARNING: You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling invalid proxy request.", realm->realm);
		} else {
			/*
			 *	Don't authenticate, as the request is
			 *	proxied.
			 */
			return RLM_MODULE_OK;
		}
	}

	/*
	 *	Perhaps there is a Stripped-User-Name now.
	 */
	namepair = request->username;

	/*
	 *	Validate the user
	 */
	do {
		if ((result = check_expiration(request)) < 0)
				break;
		result = rad_check_password(request);
		if (result > 0) {
			/* don't reply! */
			return RLM_MODULE_HANDLED;
		}
	} while(0);

	/*
	 *	Failed to validate the user.
	 *
	 *	We PRESUME that the code which failed will clean up
	 *	request->reply->vps, to be ONLY the reply items it
	 *	wants to send back.
	 */
	if (result < 0) {
		DEBUG2("auth: Failed to validate the user.");
		request->reply->code = PW_AUTHENTICATION_REJECT;

		if ((module_msg = pairfind(request->packet->vps,PW_MODULE_FAILURE_MESSAGE)) != NULL){
			char msg[MAX_STRING_LEN+19];

			snprintf(msg, sizeof(msg), "Login incorrect (%s)",
				 module_msg->strvalue);
			rad_authlog(msg, request, 0);
		} else {
			rad_authlog("Login incorrect", request, 0);
		}

		/* double check: maybe the secret is wrong? */
		if ((debug_flag > 1) && (auth_item != NULL) &&
				(auth_item->attribute == PW_PASSWORD)) {
			u_char *p;

			p = auth_item->strvalue;
			while (*p != '\0') {
				if (!isprint((int) *p)) {
					log_debug("  WARNING: Unprintable characters in the password.\n\t  Double-check the shared secret on the server and the NAS!");
					break;
				}
				p++;
			}
		}
	}

	if (result >= 0 &&
	    (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE)) != NULL) {
		VALUE_PAIR	*session_type;
		int		sess_type = 0;

		session_type = pairfind(request->config_items, PW_SESSION_TYPE);
		if (session_type)
			sess_type = session_type->lvalue;

		/*
		 *	User authenticated O.K. Now we have to check
		 *	for the Simultaneous-Use parameter.
		 */
		if (namepair &&
		    (r = module_checksimul(sess_type,request, check_item->lvalue)) != 0) {
			char mpp_ok = 0;

			if (r == 2){
				/* Multilink attempt. Check if port-limit > simultaneous-use */
				VALUE_PAIR *port_limit;

				if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT)) != NULL &&
					port_limit->lvalue > check_item->lvalue){
					DEBUG2("main auth: MPP is OK");
					mpp_ok = 1;
				}
			}
			if (!mpp_ok){
				if (check_item->lvalue > 1) {
		  		snprintf(umsg, sizeof(umsg),
							"\r\nYou are already logged in %d times  - access denied\r\n\n",
							(int)check_item->lvalue);
					user_msg = umsg;
				} else {
					user_msg = "\r\nYou are already logged in - access denied\r\n\n";
				}

				request->reply->code = PW_AUTHENTICATION_REJECT;

				/*
				 *	They're trying to log in too many times.
				 *	Remove ALL reply attributes.
				 */
				pairfree(&request->reply->vps);
				tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
				request->reply->vps = tmp;

				snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
					check_item->lvalue,
					r == 2 ? "[MPP attempt]" : "");
				rad_authlog(logstr, request, 1);

				result = -1;
			}
		}
	}

	if (result >= 0 &&
	    (check_item = pairfind(request->config_items, PW_LOGIN_TIME)) != NULL) {

		/*
		 *	Authentication is OK. Now see if this
		 *	user may login at this time of the day.
		 */
		r = timestr_match((char *)check_item->strvalue,
				  request->timestamp);

		if (r == 0) {	/* unlimited */
			/*
			 *	Do nothing: login-time is OK.
			 */

			/*
			 *	Session-Timeout needs to be at least
			 *	60 seconds, some terminal servers
			 *	ignore smaller values.
			 */
		} else if (r < 60) {
			/*
			 *	User called outside allowed time interval.
			 */
			result = -1;
			user_msg = "You are calling outside your allowed timespan\r\n";

			request->reply->code = PW_AUTHENTICATION_REJECT;
			pairfree(&request->reply->vps);

			tmp = pairmake("Reply-Message", user_msg, T_OP_SET);
			request->reply->vps = tmp;

			snprintf(logstr, sizeof(logstr), "Outside allowed timespan (time allowed %s)",
				 check_item->strvalue);
			rad_authlog(logstr, request, 1);

		} else if (r > 0) {

			/*
			 *	User is allowed, but set Session-Timeout.
			 */
			if ((reply_item = pairfind(request->reply->vps,
					PW_SESSION_TIMEOUT)) != NULL) {
				if (reply_item->lvalue > (unsigned) r)
					reply_item->lvalue = r;
			} else {
				if ((reply_item = paircreate(
						PW_SESSION_TIMEOUT,
						PW_TYPE_INTEGER)) == NULL) {
					radlog(L_ERR|L_CONS, "no memory");
					exit(1);
				}
				reply_item->lvalue = r;
				pairadd(&request->reply->vps, reply_item);
			}
		}
	}

	/*
	 *	Result should be >= 0 here - if not, it means the user
	 *	is rejected, so we just process post-auth and return.
	 */
	if (result < 0) {
		rad_postauth_reject(request);
		return RLM_MODULE_REJECT;
	}

	/*
	 *	We might need this later.  The 'password' string
	 *	is NOT used anywhere below here, except for logging,
	 *	so it should be safe...
	 */
	if ((auth_item != NULL) && (auth_item->attribute == PW_CHAP_PASSWORD)) {
		password = "CHAP-Password";
	}

	/*
	 *	Add the port number to the Framed-IP-Address if
	 *	vp->addport is set.
	 */
	if (((tmp = pairfind(request->reply->vps,
			     PW_FRAMED_IP_ADDRESS)) != NULL) &&
	    (tmp->flags.addport != 0)) {
		VALUE_PAIR *vpPortId;

		/*
		 *  Find the NAS port ID.
		 */
		if ((vpPortId = pairfind(request->packet->vps,
					 PW_NAS_PORT)) != NULL) {
		  unsigned long tvalue = ntohl(tmp->lvalue);
		  tmp->lvalue = htonl(tvalue + vpPortId->lvalue);
		  tmp->flags.addport = 0;
		  ip_ntoa(tmp->strvalue, tmp->lvalue);
		} else {
			DEBUG2("WARNING: No NAS-Port attribute in request.  CANNOT return a Framed-IP-Address + NAS-Port.\n");
			pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
		}
	}

	/*
	 *	See if we need to execute a program.
	 *	FIXME: somehow cache this info, and only execute the
	 *	program when we receive an Accounting-START packet.
	 *	Only at that time we know dynamic IP etc.
	 */
	exec_program = NULL;
	exec_wait = 0;
	if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM)) != NULL) {
		exec_wait = 0;
		exec_program = strdup((char *)auth_item->strvalue);
		pairdelete(&request->reply->vps, PW_EXEC_PROGRAM);
	}
	if ((auth_item = pairfind(request->reply->vps, PW_EXEC_PROGRAM_WAIT)) != NULL) {
		exec_wait = 1;
		exec_program = strdup((char *)auth_item->strvalue);
		pairdelete(&request->reply->vps, PW_EXEC_PROGRAM_WAIT);
	}

	/*
	 *	Hack - allow % expansion in certain value strings.
	 *	This is nice for certain Exec-Program programs.
	 */
	seen_callback_id = 0;
	if ((auth_item = pairfind(request->reply->vps, PW_CALLBACK_ID)) != NULL) {
		seen_callback_id = 1;
		radius_xlat(buf, sizeof(auth_item->strvalue),
			    (char *)auth_item->strvalue, request, NULL);
		strNcpy((char *)auth_item->strvalue, buf,
			sizeof(auth_item->strvalue));
		auth_item->length = strlen((char *)auth_item->strvalue);
	}


	/*
	 *	If we want to exec a program, but wait for it,
	 *	do it first before sending the reply.
	 */
	if (exec_program && exec_wait) {
		r = radius_exec_program(exec_program, request,
					exec_wait,
					umsg, sizeof(umsg),
					request->packet->vps, &tmp);
		free(exec_program);
		exec_program = NULL;

		/*
		 *	Always add the value-pairs to the reply.
		 */
		pairmove(&request->reply->vps, &tmp);
		pairfree(&tmp);

		if (r != 0) {
			/*
			 *	Error. radius_exec_program() returns -1 on
			 *	fork/exec errors, or >0 if the exec'ed program
			 *	had a non-zero exit status.
			 */
			if (umsg[0] == '\0') {
				user_msg = "\r\nAccess denied (external check failed).";
			} else {
				user_msg = &umsg[0];
			}

			request->reply->code = PW_AUTHENTICATION_REJECT;
			tmp = pairmake("Reply-Message", user_msg, T_OP_SET);

			pairadd(&request->reply->vps, tmp);
			rad_authlog("Login incorrect (external check failed)",
					request, 0);

			rad_postauth_reject(request);

			return RLM_MODULE_REJECT;
		}
	}

	/*
	 *	Delete "normal" A/V pairs when using callback.
	 *
	 *	FIXME: This is stupid. The portmaster should accept
	 *	these settings instead of insisting on using a
	 *	dialout location.
	 *
	 *	FIXME2: Move this into the above exec thingy?
	 *	(if you knew how I use the exec_wait, you'd understand).
	 */
	if (seen_callback_id) {
		pairdelete(&request->reply->vps, PW_FRAMED_PROTOCOL);
		pairdelete(&request->reply->vps, PW_FRAMED_IP_ADDRESS);
		pairdelete(&request->reply->vps, PW_FRAMED_IP_NETMASK);
		pairdelete(&request->reply->vps, PW_FRAMED_ROUTE);
		pairdelete(&request->reply->vps, PW_FRAMED_MTU);
		pairdelete(&request->reply->vps, PW_FRAMED_COMPRESSION);
		pairdelete(&request->reply->vps, PW_FILTER_ID);
		pairdelete(&request->reply->vps, PW_PORT_LIMIT);
		pairdelete(&request->reply->vps, PW_CALLBACK_NUMBER);
	}

	/*
	 *	Filter (possibly multiple) Reply-Message attributes
	 *	through radius_xlat, modifying them in place.
	 */
	if (user_msg == NULL) {
		reply_item = pairfind(request->reply->vps, PW_REPLY_MESSAGE);
		while (reply_item) {
			radius_xlat(buf, sizeof(reply_item->strvalue),
				    (char *)reply_item->strvalue, request, NULL);
			strNcpy((char *)reply_item->strvalue, buf,
				sizeof(reply_item->strvalue));
			reply_item->length = strlen((char *)reply_item->strvalue);
			user_msg = NULL;
			reply_item = pairfind(reply_item->next, PW_REPLY_MESSAGE);
		}
	}

	/*
	 *	Set the reply to Access-Accept, if it hasn't already
	 *	been set to something.  (i.e. Access-Challenge)
	 */
	if (request->reply->code == 0)
	  request->reply->code = PW_AUTHENTICATION_ACK;

	if ((module_msg = pairfind(request->packet->vps,PW_MODULE_SUCCESS_MESSAGE)) != NULL){
		char msg[MAX_STRING_LEN+12];

		snprintf(msg, sizeof(msg), "Login OK (%s)",
			 module_msg->strvalue);
		rad_authlog(msg, request, 1);
	} else {
		rad_authlog("Login OK", request, 1);
	}

	if (exec_program && !exec_wait) {
		/*
		 *	No need to check the exit status here.
		 */
		radius_exec_program(exec_program, request, exec_wait,
				    NULL, 0, request->packet->vps, NULL);
	}

	if (exec_program)
		free(exec_program);

	result = rad_postauth(request);

	return result;
}