xref: /freebsd/lib/libpam/modules/pam_tacplus/pam_tacplus.c (revision 545aa4710122e31a121b527e636f983f2b3a389e)
19a10bb17SJohn Polstra /*-
29a10bb17SJohn Polstra  * Copyright 1998 Juniper Networks, Inc.
39a10bb17SJohn Polstra  * All rights reserved.
4111ccd25SDag-Erling Smørgrav  * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
58d3978c1SDag-Erling Smørgrav  * All rights reserved.
68d3978c1SDag-Erling Smørgrav  *
78d3978c1SDag-Erling Smørgrav  * Portions of this software were developed for the FreeBSD Project by
88d3978c1SDag-Erling Smørgrav  * ThinkSec AS and NAI Labs, the Security Research Division of Network
98d3978c1SDag-Erling Smørgrav  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
108d3978c1SDag-Erling Smørgrav  * ("CBOSS"), as part of the DARPA CHATS research program.
119a10bb17SJohn Polstra  *
129a10bb17SJohn Polstra  * Redistribution and use in source and binary forms, with or without
139a10bb17SJohn Polstra  * modification, are permitted provided that the following conditions
149a10bb17SJohn Polstra  * are met:
159a10bb17SJohn Polstra  * 1. Redistributions of source code must retain the above copyright
169a10bb17SJohn Polstra  *    notice, this list of conditions and the following disclaimer.
179a10bb17SJohn Polstra  * 2. Redistributions in binary form must reproduce the above copyright
189a10bb17SJohn Polstra  *    notice, this list of conditions and the following disclaimer in the
199a10bb17SJohn Polstra  *    documentation and/or other materials provided with the distribution.
208d3978c1SDag-Erling Smørgrav  * 3. The name of the author may not be used to endorse or promote
218d3978c1SDag-Erling Smørgrav  *    products derived from this software without specific prior written
228d3978c1SDag-Erling Smørgrav  *    permission.
239a10bb17SJohn Polstra  *
249a10bb17SJohn Polstra  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
259a10bb17SJohn Polstra  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
269a10bb17SJohn Polstra  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
279a10bb17SJohn Polstra  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
289a10bb17SJohn Polstra  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
299a10bb17SJohn Polstra  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
309a10bb17SJohn Polstra  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
319a10bb17SJohn Polstra  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
329a10bb17SJohn Polstra  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
339a10bb17SJohn Polstra  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
349a10bb17SJohn Polstra  * SUCH DAMAGE.
359a10bb17SJohn Polstra  */
369a10bb17SJohn Polstra 
37ceaf33f5SMatthew Dillon #include <sys/cdefs.h>
38ceaf33f5SMatthew Dillon __FBSDID("$FreeBSD$");
39ceaf33f5SMatthew Dillon 
409a10bb17SJohn Polstra #include <sys/param.h>
419a10bb17SJohn Polstra 
429a10bb17SJohn Polstra #include <pwd.h>
439a10bb17SJohn Polstra #include <stdlib.h>
449a10bb17SJohn Polstra #include <string.h>
459a10bb17SJohn Polstra #include <syslog.h>
469a10bb17SJohn Polstra #include <taclib.h>
479a10bb17SJohn Polstra #include <unistd.h>
489a10bb17SJohn Polstra 
499a10bb17SJohn Polstra #define PAM_SM_AUTH
508d3978c1SDag-Erling Smørgrav 
518c66575dSDag-Erling Smørgrav #include <security/pam_appl.h>
529a10bb17SJohn Polstra #include <security/pam_modules.h>
538c66575dSDag-Erling Smørgrav #include <security/pam_mod_misc.h>
549a10bb17SJohn Polstra 
55545aa471SDag-Erling Smørgrav #define PAM_OPT_CONF		"conf"
56545aa471SDag-Erling Smørgrav #define PAM_OPT_TEMPLATE_USER	"template_user"
579a10bb17SJohn Polstra 
589a10bb17SJohn Polstra typedef int (*set_func)(struct tac_handle *, const char *);
599a10bb17SJohn Polstra 
609a10bb17SJohn Polstra static int	 do_item(pam_handle_t *, struct tac_handle *, int,
619a10bb17SJohn Polstra 		    set_func, const char *);
629a10bb17SJohn Polstra static char	*get_msg(struct tac_handle *);
639a10bb17SJohn Polstra static int	 set_msg(struct tac_handle *, const char *);
649a10bb17SJohn Polstra 
659a10bb17SJohn Polstra static int
669a10bb17SJohn Polstra do_item(pam_handle_t *pamh, struct tac_handle *tach, int item,
679a10bb17SJohn Polstra     set_func func, const char *funcname)
689a10bb17SJohn Polstra {
699a10bb17SJohn Polstra 	int retval;
709a10bb17SJohn Polstra 	const void *value;
719a10bb17SJohn Polstra 
721642eb1aSMark Murray 	retval = pam_get_item(pamh, item, &value);
731642eb1aSMark Murray 	if (retval != PAM_SUCCESS)
749a10bb17SJohn Polstra 	    return retval;
759a10bb17SJohn Polstra 	if (value != NULL && (*func)(tach, (const char *)value) == -1) {
769a10bb17SJohn Polstra 		syslog(LOG_CRIT, "%s: %s", funcname, tac_strerror(tach));
779a10bb17SJohn Polstra 		tac_close(tach);
789a10bb17SJohn Polstra 		return PAM_SERVICE_ERR;
799a10bb17SJohn Polstra 	}
809a10bb17SJohn Polstra 	return PAM_SUCCESS;
819a10bb17SJohn Polstra }
829a10bb17SJohn Polstra 
839a10bb17SJohn Polstra static char *
849a10bb17SJohn Polstra get_msg(struct tac_handle *tach)
859a10bb17SJohn Polstra {
869a10bb17SJohn Polstra 	char *msg;
879a10bb17SJohn Polstra 
881642eb1aSMark Murray 	msg = tac_get_msg(tach);
891642eb1aSMark Murray 	if (msg == NULL) {
909a10bb17SJohn Polstra 		syslog(LOG_CRIT, "tac_get_msg: %s", tac_strerror(tach));
919a10bb17SJohn Polstra 		tac_close(tach);
929a10bb17SJohn Polstra 		return NULL;
939a10bb17SJohn Polstra 	}
949a10bb17SJohn Polstra 	return msg;
959a10bb17SJohn Polstra }
969a10bb17SJohn Polstra 
979a10bb17SJohn Polstra static int
989a10bb17SJohn Polstra set_msg(struct tac_handle *tach, const char *msg)
999a10bb17SJohn Polstra {
1009a10bb17SJohn Polstra 	if (tac_set_msg(tach, msg) == -1) {
1019a10bb17SJohn Polstra 		syslog(LOG_CRIT, "tac_set_msg: %s", tac_strerror(tach));
1029a10bb17SJohn Polstra 		tac_close(tach);
1039a10bb17SJohn Polstra 		return -1;
1049a10bb17SJohn Polstra 	}
1059a10bb17SJohn Polstra 	return 0;
1069a10bb17SJohn Polstra }
1079a10bb17SJohn Polstra 
1089a10bb17SJohn Polstra PAM_EXTERN int
10924fe7ba0SDag-Erling Smørgrav pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
110545aa471SDag-Erling Smørgrav     int argc __unused, const char *argv[] __unused)
1119a10bb17SJohn Polstra {
1129a10bb17SJohn Polstra 	int retval;
1139a10bb17SJohn Polstra 	struct tac_handle *tach;
114545aa471SDag-Erling Smørgrav 	const char *conf_file, *template_user;
1159a10bb17SJohn Polstra 
116545aa471SDag-Erling Smørgrav 	conf_file = openpam_get_option(pamh, PAM_OPT_CONF);
117545aa471SDag-Erling Smørgrav 	template_user = openpam_get_option(pamh, PAM_OPT_TEMPLATE_USER);
1181642eb1aSMark Murray 
1191642eb1aSMark Murray 	tach = tac_open();
1201642eb1aSMark Murray 	if (tach == NULL) {
1219a10bb17SJohn Polstra 		syslog(LOG_CRIT, "tac_open failed");
12224fe7ba0SDag-Erling Smørgrav 		return (PAM_SERVICE_ERR);
1239a10bb17SJohn Polstra 	}
1249a10bb17SJohn Polstra 	if (tac_config(tach, conf_file) == -1) {
1259a10bb17SJohn Polstra 		syslog(LOG_ALERT, "tac_config: %s", tac_strerror(tach));
1269a10bb17SJohn Polstra 		tac_close(tach);
12724fe7ba0SDag-Erling Smørgrav 		return (PAM_SERVICE_ERR);
1289a10bb17SJohn Polstra 	}
1299a10bb17SJohn Polstra 	if (tac_create_authen(tach, TAC_AUTHEN_LOGIN, TAC_AUTHEN_TYPE_ASCII,
1309a10bb17SJohn Polstra 	    TAC_AUTHEN_SVC_LOGIN) == -1) {
1319a10bb17SJohn Polstra 		syslog(LOG_CRIT, "tac_create_authen: %s", tac_strerror(tach));
1329a10bb17SJohn Polstra 		tac_close(tach);
13324fe7ba0SDag-Erling Smørgrav 		return (PAM_SERVICE_ERR);
1349a10bb17SJohn Polstra 	}
1351642eb1aSMark Murray 
1361642eb1aSMark Murray 	PAM_LOG("Done tac_open() ... tac_close()");
1371642eb1aSMark Murray 
1381642eb1aSMark Murray 	retval = do_item(pamh, tach, PAM_USER, tac_set_user, "tac_set_user");
1391642eb1aSMark Murray 	if (retval != PAM_SUCCESS)
14024fe7ba0SDag-Erling Smørgrav 		return (retval);
1411642eb1aSMark Murray 
1421642eb1aSMark Murray 	PAM_LOG("Done user");
1431642eb1aSMark Murray 
1441642eb1aSMark Murray 	retval = do_item(pamh, tach, PAM_TTY, tac_set_port, "tac_set_port");
1451642eb1aSMark Murray 	if (retval != PAM_SUCCESS)
14624fe7ba0SDag-Erling Smørgrav 		return (retval);
1471642eb1aSMark Murray 
1481642eb1aSMark Murray 	PAM_LOG("Done tty");
1491642eb1aSMark Murray 
1501642eb1aSMark Murray 	retval = do_item(pamh, tach, PAM_RHOST, tac_set_rem_addr,
1511642eb1aSMark Murray 	    "tac_set_rem_addr");
1521642eb1aSMark Murray 	if (retval != PAM_SUCCESS)
15324fe7ba0SDag-Erling Smørgrav 		return (retval);
1541642eb1aSMark Murray 
1559a10bb17SJohn Polstra 	for (;;) {
1569a10bb17SJohn Polstra 		char *srvr_msg;
1579a10bb17SJohn Polstra 		size_t msg_len;
1589a10bb17SJohn Polstra 		const char *user_msg;
1599a10bb17SJohn Polstra 		char *data_msg;
1609a10bb17SJohn Polstra 		int sflags;
1619a10bb17SJohn Polstra 		int status;
1629a10bb17SJohn Polstra 
1631642eb1aSMark Murray 		sflags = tac_send_authen(tach);
1641642eb1aSMark Murray 		if (sflags == -1) {
1659a10bb17SJohn Polstra 			syslog(LOG_CRIT, "tac_send_authen: %s",
1669a10bb17SJohn Polstra 			    tac_strerror(tach));
1679a10bb17SJohn Polstra 			tac_close(tach);
16824fe7ba0SDag-Erling Smørgrav 			return (PAM_AUTHINFO_UNAVAIL);
1699a10bb17SJohn Polstra 		}
1709a10bb17SJohn Polstra 		status = TAC_AUTHEN_STATUS(sflags);
171545aa471SDag-Erling Smørgrav 		openpam_set_option(pamh, PAM_OPT_ECHO_PASS,
172545aa471SDag-Erling Smørgrav 		    TAC_AUTHEN_NOECHO(sflags) ? NULL : "");
1739a10bb17SJohn Polstra 		switch (status) {
1749a10bb17SJohn Polstra 
1759a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_PASS:
1769a10bb17SJohn Polstra 			tac_close(tach);
1779a10bb17SJohn Polstra 			if (template_user != NULL) {
1789a10bb17SJohn Polstra 				const void *item;
1799a10bb17SJohn Polstra 				const char *user;
1809a10bb17SJohn Polstra 
1811642eb1aSMark Murray 				PAM_LOG("Trying template user: %s",
1821642eb1aSMark Murray 				    template_user);
1831642eb1aSMark Murray 
1849a10bb17SJohn Polstra 				/*
1859a10bb17SJohn Polstra 				 * If the given user name doesn't exist in
1869a10bb17SJohn Polstra 				 * the local password database, change it
1879a10bb17SJohn Polstra 				 * to the value given in the "template_user"
1889a10bb17SJohn Polstra 				 * option.
1899a10bb17SJohn Polstra 				 */
1909a10bb17SJohn Polstra 				retval = pam_get_item(pamh, PAM_USER, &item);
1919a10bb17SJohn Polstra 				if (retval != PAM_SUCCESS)
19224fe7ba0SDag-Erling Smørgrav 					return (retval);
1939a10bb17SJohn Polstra 				user = (const char *)item;
1941642eb1aSMark Murray 				if (getpwnam(user) == NULL) {
1959a10bb17SJohn Polstra 					pam_set_item(pamh, PAM_USER,
1969a10bb17SJohn Polstra 					    template_user);
1971642eb1aSMark Murray 					PAM_LOG("Using template user");
1989a10bb17SJohn Polstra 				}
1991642eb1aSMark Murray 			}
20024fe7ba0SDag-Erling Smørgrav 			return (PAM_SUCCESS);
2019a10bb17SJohn Polstra 
2029a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_FAIL:
2039a10bb17SJohn Polstra 			tac_close(tach);
20465550d9bSMark Murray 			PAM_VERBOSE_ERROR("TACACS+ authentication failed");
20524fe7ba0SDag-Erling Smørgrav 			return (PAM_AUTH_ERR);
2069a10bb17SJohn Polstra 
2079a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_GETUSER:
2089a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_GETPASS:
2099a10bb17SJohn Polstra 			if ((srvr_msg = get_msg(tach)) == NULL)
21024fe7ba0SDag-Erling Smørgrav 				return (PAM_SERVICE_ERR);
2119a10bb17SJohn Polstra 			if (status == TAC_AUTHEN_STATUS_GETUSER)
2129a10bb17SJohn Polstra 				retval = pam_get_user(pamh, &user_msg,
213111ccd25SDag-Erling Smørgrav 				    *srvr_msg ? srvr_msg : NULL);
2149a10bb17SJohn Polstra 			else if (status == TAC_AUTHEN_STATUS_GETPASS)
215111ccd25SDag-Erling Smørgrav 				retval = pam_get_authtok(pamh,
216111ccd25SDag-Erling Smørgrav 				    PAM_AUTHTOK, &user_msg,
217111ccd25SDag-Erling Smørgrav 				    *srvr_msg ? srvr_msg : "Password:");
2189a10bb17SJohn Polstra 			free(srvr_msg);
2199a10bb17SJohn Polstra 			if (retval != PAM_SUCCESS) {
2209a10bb17SJohn Polstra 				/* XXX - send a TACACS+ abort packet */
2219a10bb17SJohn Polstra 				tac_close(tach);
22224fe7ba0SDag-Erling Smørgrav 				return (retval);
2239a10bb17SJohn Polstra 			}
2249a10bb17SJohn Polstra 			if (set_msg(tach, user_msg) == -1)
22524fe7ba0SDag-Erling Smørgrav 				return (PAM_SERVICE_ERR);
2269a10bb17SJohn Polstra 			break;
2279a10bb17SJohn Polstra 
2289a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_GETDATA:
2299a10bb17SJohn Polstra 			if ((srvr_msg = get_msg(tach)) == NULL)
23024fe7ba0SDag-Erling Smørgrav 				return (PAM_SERVICE_ERR);
2319a10bb17SJohn Polstra 			retval = pam_prompt(pamh,
232545aa471SDag-Erling Smørgrav 			    openpam_get_option(pamh, PAM_OPT_ECHO_PASS) ?
233545aa471SDag-Erling Smørgrav 			    PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF,
234111ccd25SDag-Erling Smørgrav 			    &data_msg, "%s", *srvr_msg ? srvr_msg : "Data:");
2359a10bb17SJohn Polstra 			free(srvr_msg);
2369a10bb17SJohn Polstra 			if (retval != PAM_SUCCESS) {
2379a10bb17SJohn Polstra 				/* XXX - send a TACACS+ abort packet */
2389a10bb17SJohn Polstra 				tac_close(tach);
23924fe7ba0SDag-Erling Smørgrav 				return (retval);
2409a10bb17SJohn Polstra 			}
2419a10bb17SJohn Polstra 			retval = set_msg(tach, data_msg);
2429a10bb17SJohn Polstra 			memset(data_msg, 0, strlen(data_msg));
2439a10bb17SJohn Polstra 			free(data_msg);
2449a10bb17SJohn Polstra 			if (retval == -1)
24524fe7ba0SDag-Erling Smørgrav 				return (PAM_SERVICE_ERR);
2469a10bb17SJohn Polstra 			break;
2479a10bb17SJohn Polstra 
2489a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_ERROR:
2499a10bb17SJohn Polstra 			srvr_msg = (char *)tac_get_data(tach, &msg_len);
2509a10bb17SJohn Polstra 			if (srvr_msg != NULL && msg_len != 0) {
2519a10bb17SJohn Polstra 				syslog(LOG_CRIT, "tac_send_authen:"
2529a10bb17SJohn Polstra 				    " server detected error: %s", srvr_msg);
2539a10bb17SJohn Polstra 				free(srvr_msg);
2541642eb1aSMark Murray 			}
2551642eb1aSMark Murray 			else
2569a10bb17SJohn Polstra 				syslog(LOG_CRIT,
2579a10bb17SJohn Polstra 				    "tac_send_authen: server detected error");
2589a10bb17SJohn Polstra 			tac_close(tach);
25924fe7ba0SDag-Erling Smørgrav 			return (PAM_AUTHINFO_UNAVAIL);
2609a10bb17SJohn Polstra 			break;
2619a10bb17SJohn Polstra 
2629a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_RESTART:
2639a10bb17SJohn Polstra 		case TAC_AUTHEN_STATUS_FOLLOW:
2649a10bb17SJohn Polstra 		default:
2659a10bb17SJohn Polstra 			syslog(LOG_CRIT,
2669a10bb17SJohn Polstra 			    "tac_send_authen: unexpected status %#x", status);
2679a10bb17SJohn Polstra 			tac_close(tach);
26824fe7ba0SDag-Erling Smørgrav 			return (PAM_AUTHINFO_UNAVAIL);
2699a10bb17SJohn Polstra 		}
2709a10bb17SJohn Polstra 	}
2719a10bb17SJohn Polstra }
2729a10bb17SJohn Polstra 
2739a10bb17SJohn Polstra PAM_EXTERN int
27424fe7ba0SDag-Erling Smørgrav pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
27524fe7ba0SDag-Erling Smørgrav     int argc __unused, const char *argv[] __unused)
2769a10bb17SJohn Polstra {
2778d3978c1SDag-Erling Smørgrav 
27824fe7ba0SDag-Erling Smørgrav 	return (PAM_IGNORE);
2799a10bb17SJohn Polstra }
2809294327dSJohn Polstra 
2819294327dSJohn Polstra PAM_MODULE_ENTRY("pam_tacplus");
282