auth.c

使用最广泛的radius的linux的源码

/*
 * auth.c	User authentication.
 *
 * Version:	$Id: auth.c,v 1.178 2008/04/18 09:29:49 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * Copyright 2000,2006  The FreeRADIUS server project
 * Copyright 2000  Miquel van Smoorenburg <[e-mail]>
 * Copyright 2000  Jeff Carneal <[e-mail]>
 */

#include <freeradius-devel/ident.h>
RCSID("$Id: auth.c,v 1.178 2008/04/18 09:29:49 aland Exp $")

#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modules.h>
#include <freeradius-devel/rad_assert.h>

#include <ctype.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->vp_integer;

	snprintf(buf, buflen, "from client %.128s port %u%s%.128s%s",
			request->client->shortname, port,
		 (do_cli ? " cli " : ""), (do_cli ? (char *)cli->vp_strvalue : ""),
		 (request->packet->dst_port == 0) ? " via TLS tunnel" : "");

	return buf;
}



/*
 * 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 (!request->root->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->vp_strvalue,
				username->length,
				clean_username, sizeof(clean_username));
	}

	/*
	 *	Clean up the password
	 */
	if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
		if (!request->password) {
			VALUE_PAIR *auth_type;

			auth_type = pairfind(request->config_items,
					     PW_AUTH_TYPE);
			if (auth_type && (auth_type->vp_strvalue[0] != '\0')) {
				snprintf(clean_password, sizeof(clean_password),
					 "<via Auth-Type = %s>",
					 auth_type->vp_strvalue);
			} else {
				strcpy(clean_password, "<no User-Password attribute>");
			}
		} else if (pairfind(request->packet->vps, PW_CHAP_PASSWORD)) {
			strcpy(clean_password, "<CHAP-Password>");
		} else {
			librad_safeprint((char *)request->password->vp_strvalue,
					 request->password->length,
					 clean_password, sizeof(clean_password));
		}
	}

	if (goodpass) {
		radlog(L_AUTH, "%s: [%s%s%s] (%s)",
				msg,
				clean_username,
				request->root->log_auth_goodpass ? "/" : "",
				request->root->log_auth_goodpass ? clean_password : "",
				auth_name(buf, sizeof(buf), request, 1));
	} else {
		radlog(L_AUTH, "%s: [%s%s%s] (%s)",
				msg,
				clean_username,
				request->root->log_auth_badpass ? "/" : "",
				request->root->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 !
 */
static int rad_check_password(REQUEST *request)
{
	VALUE_PAIR *auth_type_pair;
	VALUE_PAIR *cur_config_item;
	VALUE_PAIR *password_pair;
	VALUE_PAIR *auth_item;
	uint8_t my_chap[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->vp_integer;
		auth_type_count++;

		DEBUG2("  rad_check_password:  Found Auth-Type %s",
				auth_type_pair->vp_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->vp_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;
	}

	password_pair =  pairfind(request->config_items, PW_USER_PASSWORD);
	if (password_pair &&
	    pairfind(request->config_items, PW_CLEARTEXT_PASSWORD)) {
		pairdelete(&request->config_items, PW_USER_PASSWORD);
		password_pair = NULL;
	}

	if (password_pair) {
		DICT_ATTR *da;

		DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
		DEBUG("!!!    Replacing User-Password in config items with Cleartext-Password.     !!!");
		DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
		DEBUG("!!! Please update your configuration so that the \"known good\"               !!!");
		DEBUG("!!! clear text password is in Cleartext-Password, and not in User-Password. !!!");
		DEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
		password_pair->attribute = PW_CLEARTEXT_PASSWORD;
		da = dict_attrbyvalue(PW_CLEARTEXT_PASSWORD);
		if (!da) {
			radlog(L_ERR, "FATAL: You broke the dictionaries.  Please use the default dictionaries!");
			_exit(1);
		}

		password_pair->name = da->name;
	}

	/*
	 *	Find the "known good" password.
	 *
	 *	FIXME: We should get rid of these hacks, and replace
	 *	them with a module.
	 */
	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_CLEARTEXT_PASSWORD);
	}

	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 (fr_crypt_check((char *)auth_item->vp_strvalue,
									 (char *)password_pair->vp_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)
				auth_item = pairfind(request->packet->vps,
						     PW_CHAP_PASSWORD);
			if (!auth_item) {
				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_USER_PASSWORD) {
				if (strcmp((char *)password_pair->vp_strvalue,
					   (char *)auth_item->vp_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, my_chap,
					auth_item->vp_octets[0], password_pair);

			/*
			 *	Compare them
			 */
			if (memcmp(my_chap + 1, auth_item->vp_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;