[openssh.git] / auth-krb4.c

/*
 * Copyright (c) 1999 Dug Song.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"
RCSID("$OpenBSD: auth-krb4.c,v 1.22 2001/01/21 19:05:41 markus Exp $");

#ifdef KRB4
#include "ssh.h"
#include "ssh1.h"
#include "packet.h"
#include "xmalloc.h"
#include "log.h"
#include "servconf.h"
#include "auth.h"
#include "radix.h"

char *ticket = NULL;

extern ServerOptions options;

/*
 * try krb4 authentication,
 * return 1 on success, 0 on failure, -1 if krb4 is not available
 */

int
auth_krb4_password(struct passwd * pw, const char *password)
{
	AUTH_DAT adata;
	KTEXT_ST tkt;
	struct hostent *hp;
	u_long faddr;
	char localhost[MAXHOSTNAMELEN];
	char phost[INST_SZ];
	char realm[REALM_SZ];
	int r;

	/*
	 * Try Kerberos password authentication only for non-root
	 * users and only if Kerberos is installed.
	 */
	if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) {

		/* Set up our ticket file. */
		if (!krb4_init(pw->pw_uid)) {
			log("Couldn't initialize Kerberos ticket file for %s!",
			    pw->pw_name);
			goto kerberos_auth_failure;
		}
		/* Try to get TGT using our password. */
		r = krb_get_pw_in_tkt((char *) pw->pw_name, "",
		    realm, "krbtgt", realm,
		    DEFAULT_TKT_LIFE, (char *) password);
		if (r != INTK_OK) {
			packet_send_debug("Kerberos V4 password "
			    "authentication for %s failed: %s",
			    pw->pw_name, krb_err_txt[r]);
			goto kerberos_auth_failure;
		}
		/* Successful authentication. */
		chown(tkt_string(), pw->pw_uid, pw->pw_gid);

		/*
		 * Now that we have a TGT, try to get a local
		 * "rcmd" ticket to ensure that we are not talking
		 * to a bogus Kerberos server.
		 */
		(void) gethostname(localhost, sizeof(localhost));
		(void) strlcpy(phost, (char *) krb_get_phost(localhost),
		    INST_SZ);
		r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33);

		if (r == KSUCCESS) {
			if (!(hp = gethostbyname(localhost))) {
				log("Couldn't get local host address!");
				goto kerberos_auth_failure;
			}
			memmove((void *) &faddr, (void *) hp->h_addr,
			    sizeof(faddr));

			/* Verify our "rcmd" ticket. */
			r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost,
			    faddr, &adata, "");
			if (r == RD_AP_UNDEC) {
				/*
				 * Probably didn't have a srvtab on
				 * localhost. Disallow login.
				 */
				log("Kerberos V4 TGT for %s unverifiable, "
				    "no srvtab installed? krb_rd_req: %s",
				    pw->pw_name, krb_err_txt[r]);
				goto kerberos_auth_failure;
			} else if (r != KSUCCESS) {
				log("Kerberos V4 %s ticket unverifiable: %s",
				    KRB4_SERVICE_NAME, krb_err_txt[r]);
				goto kerberos_auth_failure;
			}
		} else if (r == KDC_PR_UNKNOWN) {
			/*
			 * Disallow login if no rcmd service exists, and
			 * log the error.
			 */
			log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s "
			    "not registered, or srvtab is wrong?", pw->pw_name,
			krb_err_txt[r], KRB4_SERVICE_NAME, phost);
			goto kerberos_auth_failure;
		} else {
			/*
			 * TGT is bad, forget it. Possibly spoofed!
			 */
			packet_send_debug("WARNING: Kerberos V4 TGT "
			    "possibly spoofed for %s: %s",
			    pw->pw_name, krb_err_txt[r]);
			goto kerberos_auth_failure;
		}

		/* Authentication succeeded. */
		return 1;

kerberos_auth_failure:
		krb4_cleanup_proc(NULL);

		if (!options.kerberos_or_local_passwd)
			return 0;
	} else {
		/* Logging in as root or no local Kerberos realm. */
		packet_send_debug("Unable to authenticate to Kerberos.");
	}
	/* Fall back to ordinary passwd authentication. */
	return -1;
}

void
krb4_cleanup_proc(void *ignore)
{
	debug("krb4_cleanup_proc called");
	if (ticket) {
		(void) dest_tkt();
		xfree(ticket);
		ticket = NULL;
	}
}

int
krb4_init(uid_t uid)
{
	static int cleanup_registered = 0;
	const char *tkt_root = TKT_ROOT;
	struct stat st;
	int fd;

	if (!ticket) {
		/* Set unique ticket string manually since we're still root. */
		ticket = xmalloc(MAXPATHLEN);
#ifdef AFS
		if (lstat("/ticket", &st) != -1)
			tkt_root = "/ticket/";
#endif /* AFS */
		snprintf(ticket, MAXPATHLEN, "%s%u_%d", tkt_root, uid, getpid());
		(void) krb_set_tkt_string(ticket);
	}
	/* Register ticket cleanup in case of fatal error. */
	if (!cleanup_registered) {
		fatal_add_cleanup(krb4_cleanup_proc, NULL);
		cleanup_registered = 1;
	}
	/* Try to create our ticket file. */
	if ((fd = mkstemp(ticket)) != -1) {
		close(fd);
		return 1;
	}
	/* Ticket file exists - make sure user owns it (just passed ticket). */
	if (lstat(ticket, &st) != -1) {
		if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) &&
		    st.st_uid == uid)
			return 1;
	}
	/* Failure - cancel cleanup function, leaving bad ticket for inspection. */
	log("WARNING: bad ticket file %s", ticket);
	fatal_remove_cleanup(krb4_cleanup_proc, NULL);
	cleanup_registered = 0;
	xfree(ticket);
	ticket = NULL;

	return 0;
}

int
auth_krb4(const char *server_user, KTEXT auth, char **client)
{
	AUTH_DAT adat = {0};
	KTEXT_ST reply;
	char instance[INST_SZ];
	int r, s;
	socklen_t slen;
	u_int cksum;
	Key_schedule schedule;
	struct sockaddr_in local, foreign;

	s = packet_get_connection_in();

	slen = sizeof(local);
	memset(&local, 0, sizeof(local));
	if (getsockname(s, (struct sockaddr *) & local, &slen) < 0)
		debug("getsockname failed: %.100s", strerror(errno));
	slen = sizeof(foreign);
	memset(&foreign, 0, sizeof(foreign));
	if (getpeername(s, (struct sockaddr *) & foreign, &slen) < 0) {
		debug("getpeername failed: %.100s", strerror(errno));
		fatal_cleanup();
	}
	instance[0] = '*';
	instance[1] = 0;

	/* Get the encrypted request, challenge, and session key. */
	if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, 0, &adat, ""))) {
		packet_send_debug("Kerberos V4 krb_rd_req: %.100s", krb_err_txt[r]);
		return 0;
	}
	des_key_sched((des_cblock *) adat.session, schedule);

	*client = xmalloc(MAX_K_NAME_SZ);
	(void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname,
	    *adat.pinst ? "." : "", adat.pinst, adat.prealm);

	/* Check ~/.klogin authorization now. */
	if (kuserok(&adat, (char *) server_user) != KSUCCESS) {
		packet_send_debug("Kerberos V4 .klogin authorization failed!");
		log("Kerberos V4 .klogin authorization failed for %s to account %s",
		    *client, server_user);
		xfree(*client);
		return 0;
	}
	/* Increment the checksum, and return it encrypted with the
	   session key. */
	cksum = adat.checksum + 1;
	cksum = htonl(cksum);

	/* If we can't successfully encrypt the checksum, we send back an
	   empty message, admitting our failure. */
	if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1,
	    schedule, &adat.session, &local, &foreign)) < 0) {
		packet_send_debug("Kerberos V4 mk_priv: (%d) %s", r, krb_err_txt[r]);
		reply.dat[0] = 0;
		reply.length = 0;
	} else
		reply.length = r;

	/* Clear session key. */
	memset(&adat.session, 0, sizeof(&adat.session));

	packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
	packet_put_string((char *) reply.dat, reply.length);
	packet_send();
	packet_write_wait();
	return 1;
}
#endif /* KRB4 */

#ifdef AFS
int
auth_kerberos_tgt(struct passwd *pw, const char *string)
{
	CREDENTIALS creds;

	if (pw == NULL)
		goto auth_kerberos_tgt_failure;
	if (!radix_to_creds(string, &creds)) {
		log("Protocol error decoding Kerberos V4 tgt");
		packet_send_debug("Protocol error decoding Kerberos V4 tgt");
		goto auth_kerberos_tgt_failure;
	}
	if (strncmp(creds.service, "", 1) == 0)	/* backward compatibility */
		strlcpy(creds.service, "krbtgt", sizeof creds.service);

	if (strcmp(creds.service, "krbtgt")) {
		log("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", creds.pname,
		    creds.pinst[0] ? "." : "", creds.pinst, creds.realm,
		    pw->pw_name);
		packet_send_debug("Kerberos V4 tgt (%s%s%s@%s) rejected for %s",
		    creds.pname, creds.pinst[0] ? "." : "", creds.pinst,
		    creds.realm, pw->pw_name);
		goto auth_kerberos_tgt_failure;
	}
	if (!krb4_init(pw->pw_uid))
		goto auth_kerberos_tgt_failure;

	if (in_tkt(creds.pname, creds.pinst) != KSUCCESS)
		goto auth_kerberos_tgt_failure;

	if (save_credentials(creds.service, creds.instance, creds.realm,
	    creds.session, creds.lifetime, creds.kvno,
	    &creds.ticket_st, creds.issue_date) != KSUCCESS) {
		packet_send_debug("Kerberos V4 tgt refused: couldn't save credentials");
		goto auth_kerberos_tgt_failure;
	}
	/* Successful authentication, passed all checks. */
	chown(tkt_string(), pw->pw_uid, pw->pw_gid);

	packet_send_debug("Kerberos V4 tgt accepted (%s.%s@%s, %s%s%s@%s)",
	    creds.service, creds.instance, creds.realm, creds.pname,
	    creds.pinst[0] ? "." : "", creds.pinst, creds.realm);
	memset(&creds, 0, sizeof(creds));
	packet_start(SSH_SMSG_SUCCESS);
	packet_send();
	packet_write_wait();
	return 1;

auth_kerberos_tgt_failure:
	krb4_cleanup_proc(NULL);
	memset(&creds, 0, sizeof(creds));
	packet_start(SSH_SMSG_FAILURE);
	packet_send();
	packet_write_wait();
	return 0;
}

int
auth_afs_token(struct passwd *pw, const char *token_string)
{
	CREDENTIALS creds;
	uid_t uid;

	if (pw == NULL) {
		/* XXX fake protocol error */
		packet_send_debug("Protocol error decoding AFS token");
		packet_start(SSH_SMSG_FAILURE);
		packet_send();
		packet_write_wait();
		return 0;
	}
	if (!radix_to_creds(token_string, &creds)) {
		log("Protocol error decoding AFS token");
		packet_send_debug("Protocol error decoding AFS token");
		packet_start(SSH_SMSG_FAILURE);
		packet_send();
		packet_write_wait();
		return 0;
	}
	if (strncmp(creds.service, "", 1) == 0)	/* backward compatibility */
		strlcpy(creds.service, "afs", sizeof creds.service);

	if (strncmp(creds.pname, "AFS ID ", 7) == 0)
		uid = atoi(creds.pname + 7);
	else
		uid = pw->pw_uid;

	if (kafs_settoken(creds.realm, uid, &creds)) {
		log("AFS token (%s@%s) rejected for %s", creds.pname, creds.realm,
		    pw->pw_name);
		packet_send_debug("AFS token (%s@%s) rejected for %s", creds.pname,
		    creds.realm, pw->pw_name);
		memset(&creds, 0, sizeof(creds));
		packet_start(SSH_SMSG_FAILURE);
		packet_send();
		packet_write_wait();
		return 0;
	}
	packet_send_debug("AFS token accepted (%s@%s, %s@%s)", creds.service,
	    creds.realm, creds.pname, creds.realm);
	memset(&creds, 0, sizeof(creds));
	packet_start(SSH_SMSG_SUCCESS);
	packet_send();
	packet_write_wait();
	return 1;
}
#endif /* AFS */
Commit	Line	Data
8efc0c15	1	/*
bcbf86ec	2	* Copyright (c) 1999 Dug Song. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
5260325f	23	*/
8efc0c15	24
8efc0c15	25	#include "includes.h"
42f11eb2	26	RCSID("$OpenBSD: auth-krb4.c,v 1.22 2001/01/21 19:05:41 markus Exp $");
	27
	28	#ifdef KRB4
	29	#include "ssh.h"
	30	#include "ssh1.h"
8efc0c15	31	#include "packet.h"
8efc0c15	32	#include "xmalloc.h"
42f11eb2	33	#include "log.h"
57112b5a	34	#include "servconf.h"
42f11eb2	35	#include "auth.h"
42f11eb2	36	#include "radix.h"
8efc0c15	37
6a17f9c2	38	char *ticket = NULL;
6a17f9c2	39
57112b5a	40	extern ServerOptions options;
	41
	42	/*
	43	* try krb4 authentication,
	44	* return 1 on success, 0 on failure, -1 if krb4 is not available
	45	*/
	46
6ae2364d	47	int
57112b5a	48	auth_krb4_password(struct passwd * pw, const char *password)
	49	{
	50	AUTH_DAT adata;
	51	KTEXT_ST tkt;
	52	struct hostent *hp;
1e3b8b07	53	u_long faddr;
57112b5a	54	char localhost[MAXHOSTNAMELEN];
	55	char phost[INST_SZ];
	56	char realm[REALM_SZ];
	57	int r;
	58
	59	/*
	60	* Try Kerberos password authentication only for non-root
	61	* users and only if Kerberos is installed.
	62	*/
	63	if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) {
	64
	65	/* Set up our ticket file. */
	66	if (!krb4_init(pw->pw_uid)) {
	67	log("Couldn't initialize Kerberos ticket file for %s!",
	68	pw->pw_name);
	69	goto kerberos_auth_failure;
	70	}
	71	/* Try to get TGT using our password. */
	72	r = krb_get_pw_in_tkt((char *) pw->pw_name, "",
	73	realm, "krbtgt", realm,
	74	DEFAULT_TKT_LIFE, (char *) password);
	75	if (r != INTK_OK) {
	76	packet_send_debug("Kerberos V4 password "
	77	"authentication for %s failed: %s",
	78	pw->pw_name, krb_err_txt[r]);
	79	goto kerberos_auth_failure;
	80	}
	81	/* Successful authentication. */
	82	chown(tkt_string(), pw->pw_uid, pw->pw_gid);
	83
	84	/*
	85	* Now that we have a TGT, try to get a local
	86	* "rcmd" ticket to ensure that we are not talking
	87	* to a bogus Kerberos server.
	88	*/
	89	(void) gethostname(localhost, sizeof(localhost));
	90	(void) strlcpy(phost, (char *) krb_get_phost(localhost),
	91	INST_SZ);
	92	r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33);
	93
	94	if (r == KSUCCESS) {
	95	if (!(hp = gethostbyname(localhost))) {
	96	log("Couldn't get local host address!");
	97	goto kerberos_auth_failure;
	98	}
	99	memmove((void ) &faddr, (void ) hp->h_addr,
	100	sizeof(faddr));
	101
	102	/* Verify our "rcmd" ticket. */
	103	r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost,
	104	faddr, &adata, "");
	105	if (r == RD_AP_UNDEC) {
	106	/*
	107	* Probably didn't have a srvtab on
c345cf9d	108	* localhost. Disallow login.
57112b5a	109	*/
	110	log("Kerberos V4 TGT for %s unverifiable, "
	111	"no srvtab installed? krb_rd_req: %s",
	112	pw->pw_name, krb_err_txt[r]);
c345cf9d	113	goto kerberos_auth_failure;
57112b5a	114	} else if (r != KSUCCESS) {
	115	log("Kerberos V4 %s ticket unverifiable: %s",
	116	KRB4_SERVICE_NAME, krb_err_txt[r]);
	117	goto kerberos_auth_failure;
	118	}
	119	} else if (r == KDC_PR_UNKNOWN) {
	120	/*
c345cf9d	121	* Disallow login if no rcmd service exists, and
57112b5a	122	* log the error.
	123	*/
	124	log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s "
	125	"not registered, or srvtab is wrong?", pw->pw_name,
	126	krb_err_txt[r], KRB4_SERVICE_NAME, phost);
c345cf9d	127	goto kerberos_auth_failure;
57112b5a	128	} else {
	129	/*
	130	* TGT is bad, forget it. Possibly spoofed!
	131	*/
	132	packet_send_debug("WARNING: Kerberos V4 TGT "
	133	"possibly spoofed for %s: %s",
	134	pw->pw_name, krb_err_txt[r]);
	135	goto kerberos_auth_failure;
	136	}
	137
	138	/* Authentication succeeded. */
	139	return 1;
	140
	141	kerberos_auth_failure:
	142	krb4_cleanup_proc(NULL);
	143
	144	if (!options.kerberos_or_local_passwd)
	145	return 0;
	146	} else {
	147	/* Logging in as root or no local Kerberos realm. */
	148	packet_send_debug("Unable to authenticate to Kerberos.");
	149	}
	150	/* Fall back to ordinary passwd authentication. */
	151	return -1;
	152	}
	153
6a17f9c2	154	void
	155	krb4_cleanup_proc(void *ignore)
	156	{
5260325f	157	debug("krb4_cleanup_proc called");
	158	if (ticket) {
	159	(void) dest_tkt();
	160	xfree(ticket);
	161	ticket = NULL;
	162	}
6a17f9c2	163	}
6a17f9c2	164
6ae2364d	165	int
5260325f	166	krb4_init(uid_t uid)
8efc0c15	167	{
5260325f	168	static int cleanup_registered = 0;
4fe2af09	169	const char *tkt_root = TKT_ROOT;
5260325f	170	struct stat st;
	171	int fd;
	172
	173	if (!ticket) {
	174	/* Set unique ticket string manually since we're still root. */
	175	ticket = xmalloc(MAXPATHLEN);
8efc0c15	176	#ifdef AFS
5260325f	177	if (lstat("/ticket", &st) != -1)
5260325f	178	tkt_root = "/ticket/";
8efc0c15	179	#endif /* AFS */
14a9a859	180	snprintf(ticket, MAXPATHLEN, "%s%u_%d", tkt_root, uid, getpid());
5260325f	181	(void) krb_set_tkt_string(ticket);
	182	}
	183	/* Register ticket cleanup in case of fatal error. */
	184	if (!cleanup_registered) {
	185	fatal_add_cleanup(krb4_cleanup_proc, NULL);
	186	cleanup_registered = 1;
	187	}
	188	/* Try to create our ticket file. */
	189	if ((fd = mkstemp(ticket)) != -1) {
	190	close(fd);
	191	return 1;
	192	}
	193	/* Ticket file exists - make sure user owns it (just passed ticket). */
	194	if (lstat(ticket, &st) != -1) {
	195	if (st.st_mode == (S_IFREG \| S_IRUSR \| S_IWUSR) &&
	196	st.st_uid == uid)
	197	return 1;
	198	}
	199	/* Failure - cancel cleanup function, leaving bad ticket for inspection. */
	200	log("WARNING: bad ticket file %s", ticket);
	201	fatal_remove_cleanup(krb4_cleanup_proc, NULL);
	202	cleanup_registered = 0;
	203	xfree(ticket);
	204	ticket = NULL;
	205
	206	return 0;
8efc0c15	207	}
8efc0c15	208
6ae2364d	209	int
5260325f	210	auth_krb4(const char server_user, KTEXT auth, char *client)
8efc0c15	211	{
5260325f	212	AUTH_DAT adat = {0};
	213	KTEXT_ST reply;
	214	char instance[INST_SZ];
	215	int r, s;
610cd5c6	216	socklen_t slen;
5260325f	217	u_int cksum;
	218	Key_schedule schedule;
	219	struct sockaddr_in local, foreign;
	220
	221	s = packet_get_connection_in();
	222
610cd5c6	223	slen = sizeof(local);
5260325f	224	memset(&local, 0, sizeof(local));
610cd5c6	225	if (getsockname(s, (struct sockaddr *) & local, &slen) < 0)
5260325f	226	debug("getsockname failed: %.100s", strerror(errno));
610cd5c6	227	slen = sizeof(foreign);
5260325f	228	memset(&foreign, 0, sizeof(foreign));
610cd5c6	229	if (getpeername(s, (struct sockaddr *) & foreign, &slen) < 0) {
5260325f	230	debug("getpeername failed: %.100s", strerror(errno));
	231	fatal_cleanup();
	232	}
	233	instance[0] = '*';
	234	instance[1] = 0;
	235
	236	/* Get the encrypted request, challenge, and session key. */
	237	if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, 0, &adat, ""))) {
	238	packet_send_debug("Kerberos V4 krb_rd_req: %.100s", krb_err_txt[r]);
	239	return 0;
	240	}
	241	des_key_sched((des_cblock *) adat.session, schedule);
	242
	243	*client = xmalloc(MAX_K_NAME_SZ);
	244	(void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname,
	245	*adat.pinst ? "." : "", adat.pinst, adat.prealm);
	246
	247	/* Check ~/.klogin authorization now. */
	248	if (kuserok(&adat, (char *) server_user) != KSUCCESS) {
	249	packet_send_debug("Kerberos V4 .klogin authorization failed!");
	250	log("Kerberos V4 .klogin authorization failed for %s to account %s",
	251	*client, server_user);
	252	xfree(*client);
	253	return 0;
	254	}
	255	/* Increment the checksum, and return it encrypted with the
	256	session key. */
	257	cksum = adat.checksum + 1;
	258	cksum = htonl(cksum);
	259
	260	/* If we can't successfully encrypt the checksum, we send back an
	261	empty message, admitting our failure. */
	262	if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1,
	263	schedule, &adat.session, &local, &foreign)) < 0) {
	264	packet_send_debug("Kerberos V4 mk_priv: (%d) %s", r, krb_err_txt[r]);
	265	reply.dat[0] = 0;
	266	reply.length = 0;
	267	} else
	268	reply.length = r;
	269
	270	/* Clear session key. */
	271	memset(&adat.session, 0, sizeof(&adat.session));
	272
	273	packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
	274	packet_put_string((char *) reply.dat, reply.length);
	275	packet_send();
	276	packet_write_wait();
	277	return 1;
8efc0c15	278	}
	279	#endif /* KRB4 */
	280
	281	#ifdef AFS
6ae2364d	282	int
5260325f	283	auth_kerberos_tgt(struct passwd pw, const char string)
8efc0c15	284	{
5260325f	285	CREDENTIALS creds;
5260325f	286
94ec8c6b	287	if (pw == NULL)
94ec8c6b	288	goto auth_kerberos_tgt_failure;
5260325f	289	if (!radix_to_creds(string, &creds)) {
	290	log("Protocol error decoding Kerberos V4 tgt");
	291	packet_send_debug("Protocol error decoding Kerberos V4 tgt");
	292	goto auth_kerberos_tgt_failure;
	293	}
	294	if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */
	295	strlcpy(creds.service, "krbtgt", sizeof creds.service);
	296
	297	if (strcmp(creds.service, "krbtgt")) {
	298	log("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", creds.pname,
	299	creds.pinst[0] ? "." : "", creds.pinst, creds.realm,
	300	pw->pw_name);
	301	packet_send_debug("Kerberos V4 tgt (%s%s%s@%s) rejected for %s",
	302	creds.pname, creds.pinst[0] ? "." : "", creds.pinst,
	303	creds.realm, pw->pw_name);
	304	goto auth_kerberos_tgt_failure;
	305	}
	306	if (!krb4_init(pw->pw_uid))
	307	goto auth_kerberos_tgt_failure;
	308
	309	if (in_tkt(creds.pname, creds.pinst) != KSUCCESS)
	310	goto auth_kerberos_tgt_failure;
	311
	312	if (save_credentials(creds.service, creds.instance, creds.realm,
	313	creds.session, creds.lifetime, creds.kvno,
	314	&creds.ticket_st, creds.issue_date) != KSUCCESS) {
	315	packet_send_debug("Kerberos V4 tgt refused: couldn't save credentials");
	316	goto auth_kerberos_tgt_failure;
	317	}
	318	/* Successful authentication, passed all checks. */
	319	chown(tkt_string(), pw->pw_uid, pw->pw_gid);
	320
	321	packet_send_debug("Kerberos V4 tgt accepted (%s.%s@%s, %s%s%s@%s)",
	322	creds.service, creds.instance, creds.realm, creds.pname,
	323	creds.pinst[0] ? "." : "", creds.pinst, creds.realm);
	324	memset(&creds, 0, sizeof(creds));
	325	packet_start(SSH_SMSG_SUCCESS);
	326	packet_send();
	327	packet_write_wait();
	328	return 1;
	329
	330	auth_kerberos_tgt_failure:
	331	krb4_cleanup_proc(NULL);
	332	memset(&creds, 0, sizeof(creds));
	333	packet_start(SSH_SMSG_FAILURE);
	334	packet_send();
	335	packet_write_wait();
	336	return 0;
8efc0c15	337	}
8efc0c15	338
6ae2364d	339	int
5260325f	340	auth_afs_token(struct passwd pw, const char token_string)
8efc0c15	341	{
5260325f	342	CREDENTIALS creds;
94ec8c6b	343	uid_t uid;
5260325f	344
94ec8c6b	345	if (pw == NULL) {
	346	/* XXX fake protocol error */
	347	packet_send_debug("Protocol error decoding AFS token");
	348	packet_start(SSH_SMSG_FAILURE);
	349	packet_send();
	350	packet_write_wait();
	351	return 0;
	352	}
5260325f	353	if (!radix_to_creds(token_string, &creds)) {
	354	log("Protocol error decoding AFS token");
	355	packet_send_debug("Protocol error decoding AFS token");
	356	packet_start(SSH_SMSG_FAILURE);
	357	packet_send();
	358	packet_write_wait();
	359	return 0;
	360	}
	361	if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */
	362	strlcpy(creds.service, "afs", sizeof creds.service);
	363
	364	if (strncmp(creds.pname, "AFS ID ", 7) == 0)
	365	uid = atoi(creds.pname + 7);
94ec8c6b	366	else
94ec8c6b	367	uid = pw->pw_uid;
5260325f	368
	369	if (kafs_settoken(creds.realm, uid, &creds)) {
	370	log("AFS token (%s@%s) rejected for %s", creds.pname, creds.realm,
	371	pw->pw_name);
	372	packet_send_debug("AFS token (%s@%s) rejected for %s", creds.pname,
	373	creds.realm, pw->pw_name);
	374	memset(&creds, 0, sizeof(creds));
	375	packet_start(SSH_SMSG_FAILURE);
	376	packet_send();
	377	packet_write_wait();
	378	return 0;
	379	}
	380	packet_send_debug("AFS token accepted (%s@%s, %s@%s)", creds.service,
	381	creds.realm, creds.pname, creds.realm);
	382	memset(&creds, 0, sizeof(creds));
	383	packet_start(SSH_SMSG_SUCCESS);
	384	packet_send();
	385	packet_write_wait();
	386	return 1;
8efc0c15	387	}
8efc0c15	388	#endif /* AFS */