auth.c

新的radius程序

/*
 * auth.c	User authentication.
 *
 * Version:	$Id: auth.c,v 1.136.2.5.2.2 2007/03/05 14:30:04 aland Exp $
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Copyright 2000  The FreeRADIUS server project
 * Copyright 2000  Miquel van Smoorenburg <[e-mail]>
 * Copyright 2000  Jeff Carneal <[e-mail]>
 */

static const char rcsid[] = "$Id: auth.c,v 1.136.2.5.2.2 2007/03/05 14:30:04 aland Exp $";

#include "autoconf.h"
#include "libradius.h"

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#ifdef HAVE_NETINET_IN_H
#	include <netinet/in.h>
#endif

#include "radiusd.h"
#include "modules.h"

/*
 *	Return a short string showing the terminal server, port
 *	and calling station ID.
 */
char *auth_name(char *buf, size_t buflen, REQUEST *request, int do_cli) {
	VALUE_PAIR	*cli;
	VALUE_PAIR	*pair;
	int		port = 0;

	if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID)) == NULL)
		do_cli = 0;
	if ((pair = pairfind(request->packet->vps, PW_NAS_PORT)) != NULL)
		port = pair->lvalue;

	snprintf(buf, buflen, "from client %.128s port %u%s%.128s",
			client_name(request->packet->src_ipaddr), port,
			(do_cli ? " cli " : ""), (do_cli ? (char *)cli->strvalue : ""));

	return buf;
}


/*
 *	Check if account has expired, and if user may login now.
 */
static int check_expiration(REQUEST *request)
{
	VALUE_PAIR *check_item;
	VALUE_PAIR *vp;

	check_item = pairfind(request->config_items, PW_EXPIRATION);

	if (!check_item)  return 0;

	/*
	 *	Has this user's password expired?
	 *
	 *	If so, remove ALL reply attributes,
	 *	and add our own Reply-Message, saying
	 *	why they're being rejected.
	 */
	if (((time_t) check_item->lvalue) <= request->timestamp) {
		vp = pairmake("Reply-Message",
			      "Password Has Expired\r\n",
			      T_OP_ADD);
		pairfree(&request->reply->vps);
		request->reply->vps = vp;
		return -1;
	}

#define EXP_TIMEOUT ((uint32_t) (((time_t) check_item->lvalue) - request->timestamp))
	/*
	 *	Otherwise, set the Session-Timeout based on expiration.
	 */
	vp = pairfind(request->reply->vps, PW_SESSION_TIMEOUT);
	if (!vp) {
		vp = pairmake("Session-Timeout", "0", T_OP_SET);
		if (!vp) return -1; /* out of memory */
		
		vp->lvalue = EXP_TIMEOUT;
		pairadd(&request->reply->vps, vp);
	} else if (vp->lvalue > EXP_TIMEOUT) {
		vp->lvalue = EXP_TIMEOUT;
	} /* else Session-Timeout is smaller than Expiration, leave it alone */

	return 0;
}


/*
 * Make sure user/pass are clean
 * and then log them
 */
static int rad_authlog(const char *msg, REQUEST *request, int goodpass) {

	char clean_password[1024];
	char clean_username[1024];
	char buf[1024];
	VALUE_PAIR *username = NULL;

	if (!mainconfig.log_auth) {
		return 0;
	}

	/*
	 * Get the correct username based on the configured value
	 */
	if (log_stripped_names == 0) {
		username = pairfind(request->packet->vps, PW_USER_NAME);
	} else {
		username = request->username;
	}

	/*
	 *	Clean up the username
	 */
	if (username == NULL) {
		strcpy(clean_username, "<no User-Name attribute>");
	} else {
		librad_safeprint((char *)username->strvalue,
				username->length,
				clean_username, sizeof(clean_username));
	}

	/*
	 *	Clean up the password
	 */
	if (mainconfig.log_auth_badpass || mainconfig.log_auth_goodpass) {
		if (!request->password) {
			strcpy(clean_password, "<no User-Password attribute>");
		} else if (request->password->attribute == PW_CHAP_PASSWORD) {
			strcpy(clean_password, "<CHAP-Password>");
		} else {
			librad_safeprint((char *)request->password->strvalue,
					 request->password->length,
					 clean_password, sizeof(clean_password));
		}
	}

	if (goodpass) {
		radlog(L_AUTH, "%s: [%s%s%s] (%s)",
				msg,
				clean_username,
				mainconfig.log_auth_goodpass ? "/" : "",
				mainconfig.log_auth_goodpass ? clean_password : "",
				auth_name(buf, sizeof(buf), request, 1));
	} else {
		radlog(L_AUTH, "%s: [%s%s%s] (%s)",
				msg,
				clean_username,
				mainconfig.log_auth_badpass ? "/" : "",
				mainconfig.log_auth_badpass ? clean_password : "",
				auth_name(buf, sizeof(buf), request, 1));
	}

	return 0;
}

/*
 *	Check password.
 *
 *	Returns:	0  OK
 *			-1 Password fail
 *			-2 Rejected (Auth-Type = Reject, send Port-Message back)
 *			1  End check & return, don't reply
 *
 *	NOTE: NOT the same as the RLM_ values !
 */
int rad_check_password(REQUEST *request)
{
	VALUE_PAIR *auth_type_pair;
	VALUE_PAIR *cur_config_item;
	VALUE_PAIR *password_pair;
	VALUE_PAIR *auth_item;
	char string[MAX_STRING_LEN];
	int auth_type = -1;
	int result;
	int auth_type_count = 0;
	result = 0;

	/*
	 *	Look for matching check items. We skip the whole lot
	 *	if the authentication type is PW_AUTHTYPE_ACCEPT or
	 *	PW_AUTHTYPE_REJECT.
	 */
	cur_config_item = request->config_items;
	while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE))) != NULL) {
		auth_type = auth_type_pair->lvalue;
		auth_type_count++;

		DEBUG2("  rad_check_password:  Found Auth-Type %s",
				auth_type_pair->strvalue);
		cur_config_item = auth_type_pair->next;

		if (auth_type == PW_AUTHTYPE_REJECT) {
			DEBUG2("  rad_check_password: Auth-Type = Reject, rejecting user");
			return -2;
		}
	}

	if (( auth_type_count > 1) && (debug_flag)) {
		radlog(L_ERR, "Warning:  Found %d auth-types on request for user '%s'",
			auth_type_count, request->username->strvalue);
	}

	/*
	 *	This means we have a proxy reply or an accept
	 *  and it wasn't rejected in the above loop.  So
	 *  that means it is accepted and we do no further
	 *  authentication
	 */
	if ((auth_type == PW_AUTHTYPE_ACCEPT) || (request->proxy)) {
		DEBUG2("  rad_check_password: Auth-Type = Accept, accepting the user");
		return 0;
	}

	/*
	 *	Find the password from the users file.
	 */
	if ((password_pair = pairfind(request->config_items, PW_CRYPT_PASSWORD)) != NULL) {
		/*
		 *	Re-write Auth-Type, but ONLY if it isn't already
		 *	set.
		 */
		if (auth_type == -1) auth_type = PW_AUTHTYPE_CRYPT;
	} else {
		password_pair = pairfind(request->config_items, PW_PASSWORD);
		if (!password_pair) {
			password_pair = pairfind(request->config_items,
						 PW_CLEARTEXT_PASSWORD);
			if (password_pair) {
				VALUE_PAIR *old;

				old = pairmake("User-Password",
					       password_pair->strvalue,
					       T_OP_SET);
				if (old) pairadd(&request->config_items, old);
			}
		}
		
	}

	if (auth_type < 0) {
		if (password_pair) {
			auth_type = PW_AUTHTYPE_LOCAL;
		} else {
			/*
		 	*	The admin hasn't told us how to
		 	*	authenticate the user, so we reject them!
		 	*
		 	*	This is fail-safe.
		 	*/
			DEBUG2("auth: No authenticate method (Auth-Type) configuration found for the request: Rejecting the user");
			return -2;
		}
	}

	switch(auth_type) {
		DICT_VALUE *dval;

		case PW_AUTHTYPE_CRYPT:
			/*
			 *	Find the password sent by the user. It
			 *	SHOULD be there, if it's not
			 *	authentication fails.
			 */
			auth_item = request->password;
			if (auth_item == NULL) {
				DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
				return -1;
			}

			DEBUG2("auth: type Crypt");
			if (password_pair == NULL) {
				DEBUG2("No Crypt-Password configured for the user");
				rad_authlog("Login incorrect "
					"(No Crypt-Password configured for the user)", request, 0);
				return -1;
			}

			switch (lrad_crypt_check((char *)auth_item->strvalue,
									 (char *)password_pair->strvalue)) {
			case -1:
			  rad_authlog("Login incorrect "
						  "(system failed to supply an encrypted password for comparison)", request, 0);
			case 1:
			  return -1;
			}
			break;
		case PW_AUTHTYPE_LOCAL:
			DEBUG2("auth: type Local");

			/*
			 *	Find the password sent by the user. It
			 *	SHOULD be there, if it's not
			 *	authentication fails.
			 */
			auth_item = request->password;
			if (auth_item == NULL) {
				DEBUG2("auth: No User-Password or CHAP-Password attribute in the request");
				return -1;
			}

			/*
			 *	Plain text password.
			 */
			if (password_pair == NULL) {
				DEBUG2("auth: No password configured for the user");
				rad_authlog("Login incorrect "
					"(No password configured for the user)", request, 0);
				return -1;
			}

			/*
			 *	Local password is just plain text.
	 		 */
			if (auth_item->attribute == PW_PASSWORD) {
				if (strcmp((char *)password_pair->strvalue,
					   (char *)auth_item->strvalue) != 0) {
					DEBUG2("auth: user supplied User-Password does NOT match local User-Password");
					return -1;
				}
				DEBUG2("auth: user supplied User-Password matches local User-Password");
				break;

			} else if (auth_item->attribute != PW_CHAP_PASSWORD) {
				DEBUG2("The user did not supply a User-Password or a CHAP-Password attribute");
				rad_authlog("Login incorrect "
					"(no User-Password or CHAP-Password attribute)", request, 0);
				return -1;
			}

			rad_chap_encode(request->packet, string,
					auth_item->strvalue[0], password_pair);

			/*
			 *	Compare them
			 */
			if (memcmp(string + 1, auth_item->strvalue + 1,
				   CHAP_VALUE_LENGTH) != 0) {
				DEBUG2("auth: user supplied CHAP-Password does NOT match local User-Password");
				return -1;
			}
			DEBUG2("auth: user supplied CHAP-Password matches local User-Password");
			break;
		default:
			dval = dict_valbyattr(PW_AUTH_TYPE, auth_type);
			if (dval) {
				DEBUG2("auth: type \"%s\"", dval->name);
			} else {
				DEBUG2("auth: type UNKNOWN-%d", auth_type);
			}

			/*
			 *	See if there is a module that handles
			 *	this type, and turn the RLM_ return
			 *	status into the values as defined at
			 *	the top of this function.
			 */
			result = module_authenticate(auth_type, request);
			switch (result) {
				/*
				 *	An authentication module FAIL
				 *	return code, or any return code that
				 *	is not expected from authentication,
				 *	is the same as an explicit REJECT!
				 */
				case RLM_MODULE_FAIL:
				case RLM_MODULE_INVALID:
				case RLM_MODULE_NOOP:
				case RLM_MODULE_NOTFOUND:
				case RLM_MODULE_REJECT:
				case RLM_MODULE_UPDATED:
				case RLM_MODULE_USERLOCK:
				default:
					result = -1;
					break;
				case RLM_MODULE_OK:
					result = 0;
					break;
				case RLM_MODULE_HANDLED:
					result = 1;
					break;
			}
			break;
	}

	return result;
}

/*
 *	Post-authentication step processes the response before it is
 *	sent to the NAS. It can receive both Access-Accept and Access-Reject
 *	replies.
 */
int rad_postauth(REQUEST *request)
{
	int	result;
	int	postauth_type = 0;
	VALUE_PAIR *vp;

	/*
	 *	Do post-authentication calls. ignoring the return code.
	 */
	vp = pairfind(request->config_items, PW_POST_AUTH_TYPE);
	if (vp) {
		DEBUG2("  Found Post-Auth-Type %s", vp->strvalue);
		postauth_type = vp->lvalue;
	}
	result = module_post_auth(postauth_type, request);
	switch (result) {
		/*
		 *	The module failed, or said to reject the user: Do so.
		 */
		case RLM_MODULE_FAIL:
		case RLM_MODULE_INVALID:
		case RLM_MODULE_REJECT:
		case RLM_MODULE_USERLOCK:
		default:
			request->reply->code = PW_AUTHENTICATION_REJECT;
			result = RLM_MODULE_REJECT;
			break;
		/*
		 *	The module handled the request, cancel the reply.
		 */
		case RLM_MODULE_HANDLED:
			/* FIXME */
			result = RLM_MODULE_OK;
			break;
		/*
		 *	The module had a number of OK return codes.
		 */
		case RLM_MODULE_NOOP:
		case RLM_MODULE_NOTFOUND:
		case RLM_MODULE_OK:
		case RLM_MODULE_UPDATED:
			result = RLM_MODULE_OK;
			break;
	}
	return result;
}

/*
 *	Before sending an Access-Reject, call the modules in the
 *	Post-Auth-Type REJECT stanza.
 */
static int rad_postauth_reject(REQUEST *request)
{
	int		result;
	VALUE_PAIR	*tmp;
	DICT_VALUE	*dval;

	dval = dict_valbyname(PW_POST_AUTH_TYPE, "REJECT");
	if (dval) {
		/* Overwrite the Post-Auth-Type with the value REJECT */
		pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
		tmp = paircreate(PW_POST_AUTH_TYPE, PW_TYPE_INTEGER);
		tmp->lvalue = dval->value;
		pairadd(&request->config_items, tmp);
		result = rad_postauth(request);
	} else {
		/* No REJECT stanza */
		result = RLM_MODULE_OK;
	}
	return result;
}

/*
 *	Process and reply to an authentication request
 *
 *	The return value of this function isn't actually used right now, so
 *	it's not entirely clear if it is returning the right things. --Pac.
 */
int rad_authenticate(REQUEST *request)
{
	VALUE_PAIR	*namepair;
	VALUE_PAIR	*check_item;
	VALUE_PAIR	*reply_item;
	VALUE_PAIR	*auth_item;
	VALUE_PAIR	*module_msg;
	VALUE_PAIR	*tmp = NULL;
	int		result, r;
	char		umsg[MAX_STRING_LEN + 1];
	const char	*user_msg = NULL;
	const char	*password;
	char		*exec_program;
	int		exec_wait;
	int		seen_callback_id;
	char		buf[1024], logstr[1024];
	char		autz_retry = 0;
	int		autz_type = 0;

	password = "";

	/*
	 *	If this request got proxied to another server, we need
	 *	to check whether it authenticated the request or not.