1/* $OpenBSD: auth.c,v 1.113 2015/08/21 03:42:19 djm Exp $ */
2/*
3 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
27
28#include <sys/types.h>
29#include <sys/stat.h>
30
31#include <netinet/in.h>
32
33#include <errno.h>
34#include <fcntl.h>
35#ifdef HAVE_PATHS_H
36# include <paths.h>
37#endif
38#include <pwd.h>
39#ifdef HAVE_LOGIN_H
40#include <login.h>
41#endif
42#ifdef USE_SHADOW
43#include <shadow.h>
44#endif
45#ifdef HAVE_LIBGEN_H
46#include <libgen.h>
47#endif
48#include <stdarg.h>
49#include <stdio.h>
50#include <string.h>
51#include <unistd.h>
52#include <limits.h>
53
54#include "xmalloc.h"
55#include "match.h"
56#include "groupaccess.h"
57#include "log.h"
58#include "buffer.h"
59#include "misc.h"
60#include "servconf.h"
61#include "key.h"
62#include "hostfile.h"
63#include "auth.h"
64#include "auth-options.h"
65#include "canohost.h"
66#include "uidswap.h"
67#include "packet.h"
68#include "loginrec.h"
69#ifdef GSSAPI
70#include "ssh-gss.h"
71#endif
72#include "authfile.h"
73#include "monitor_wrap.h"
74#include "authfile.h"
75#include "ssherr.h"
76#include "compat.h"
77
78/* import */
79extern ServerOptions options;
80extern int use_privsep;
81extern Buffer loginmsg;
82extern struct passwd *privsep_pw;
83
84/* Debugging messages */
85Buffer auth_debug;
86int auth_debug_init;
87
88/*
89 * Check if the user is allowed to log in via ssh. If user is listed
90 * in DenyUsers or one of user's groups is listed in DenyGroups, false
91 * will be returned. If AllowUsers isn't empty and user isn't listed
92 * there, or if AllowGroups isn't empty and one of user's groups isn't
93 * listed there, false will be returned.
94 * If the user's shell is not executable, false will be returned.
95 * Otherwise true is returned.
96 */
97int
98allowed_user(struct passwd * pw)
99{
100	struct stat st;
101	const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL;
102	u_int i;
103#ifdef USE_SHADOW
104	struct spwd *spw = NULL;
105#endif
106
107	/* Shouldn't be called if pw is NULL, but better safe than sorry... */
108	if (!pw || !pw->pw_name)
109		return 0;
110
111#ifdef USE_SHADOW
112	if (!options.use_pam)
113		spw = getspnam(pw->pw_name);
114#ifdef HAS_SHADOW_EXPIRE
115	if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw))
116		return 0;
117#endif /* HAS_SHADOW_EXPIRE */
118#endif /* USE_SHADOW */
119
120	/* grab passwd field for locked account check */
121	passwd = pw->pw_passwd;
122#ifdef USE_SHADOW
123	if (spw != NULL)
124#ifdef USE_LIBIAF
125		passwd = get_iaf_password(pw);
126#else
127		passwd = spw->sp_pwdp;
128#endif /* USE_LIBIAF */
129#endif
130
131	/* check for locked account */
132	if (!options.use_pam && passwd && *passwd) {
133		int locked = 0;
134
135#ifdef LOCKED_PASSWD_STRING
136		if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0)
137			 locked = 1;
138#endif
139#ifdef LOCKED_PASSWD_PREFIX
140		if (strncmp(passwd, LOCKED_PASSWD_PREFIX,
141		    strlen(LOCKED_PASSWD_PREFIX)) == 0)
142			 locked = 1;
143#endif
144#ifdef LOCKED_PASSWD_SUBSTR
145		if (strstr(passwd, LOCKED_PASSWD_SUBSTR))
146			locked = 1;
147#endif
148#ifdef USE_LIBIAF
149		free((void *) passwd);
150#endif /* USE_LIBIAF */
151		if (locked) {
152			logit("User %.100s not allowed because account is locked",
153			    pw->pw_name);
154			return 0;
155		}
156	}
157
158	/*
159	 * Deny if shell does not exist or is not executable unless we
160	 * are chrooting.
161	 */
162	if (options.chroot_directory == NULL ||
163	    strcasecmp(options.chroot_directory, "none") == 0) {
164		char *shell = xstrdup((pw->pw_shell[0] == '\0') ?
165		    _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */
166
167		if (stat(shell, &st) != 0) {
168			logit("User %.100s not allowed because shell %.100s "
169			    "does not exist", pw->pw_name, shell);
170			free(shell);
171			return 0;
172		}
173		if (S_ISREG(st.st_mode) == 0 ||
174		    (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
175			logit("User %.100s not allowed because shell %.100s "
176			    "is not executable", pw->pw_name, shell);
177			free(shell);
178			return 0;
179		}
180		free(shell);
181	}
182
183	if (options.num_deny_users > 0 || options.num_allow_users > 0 ||
184	    options.num_deny_groups > 0 || options.num_allow_groups > 0) {
185		hostname = get_canonical_hostname(options.use_dns);
186		ipaddr = get_remote_ipaddr();
187	}
188
189	/* Return false if user is listed in DenyUsers */
190	if (options.num_deny_users > 0) {
191		for (i = 0; i < options.num_deny_users; i++)
192			if (match_user(pw->pw_name, hostname, ipaddr,
193			    options.deny_users[i])) {
194				logit("User %.100s from %.100s not allowed "
195				    "because listed in DenyUsers",
196				    pw->pw_name, hostname);
197				return 0;
198			}
199	}
200	/* Return false if AllowUsers isn't empty and user isn't listed there */
201	if (options.num_allow_users > 0) {
202		for (i = 0; i < options.num_allow_users; i++)
203			if (match_user(pw->pw_name, hostname, ipaddr,
204			    options.allow_users[i]))
205				break;
206		/* i < options.num_allow_users iff we break for loop */
207		if (i >= options.num_allow_users) {
208			logit("User %.100s from %.100s not allowed because "
209			    "not listed in AllowUsers", pw->pw_name, hostname);
210			return 0;
211		}
212	}
213	if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
214		/* Get the user's group access list (primary and supplementary) */
215		if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
216			logit("User %.100s from %.100s not allowed because "
217			    "not in any group", pw->pw_name, hostname);
218			return 0;
219		}
220
221		/* Return false if one of user's groups is listed in DenyGroups */
222		if (options.num_deny_groups > 0)
223			if (ga_match(options.deny_groups,
224			    options.num_deny_groups)) {
225				ga_free();
226				logit("User %.100s from %.100s not allowed "
227				    "because a group is listed in DenyGroups",
228				    pw->pw_name, hostname);
229				return 0;
230			}
231		/*
232		 * Return false if AllowGroups isn't empty and one of user's groups
233		 * isn't listed there
234		 */
235		if (options.num_allow_groups > 0)
236			if (!ga_match(options.allow_groups,
237			    options.num_allow_groups)) {
238				ga_free();
239				logit("User %.100s from %.100s not allowed "
240				    "because none of user's groups are listed "
241				    "in AllowGroups", pw->pw_name, hostname);
242				return 0;
243			}
244		ga_free();
245	}
246
247#ifdef CUSTOM_SYS_AUTH_ALLOWED_USER
248	if (!sys_auth_allowed_user(pw, &loginmsg))
249		return 0;
250#endif
251
252	/* We found no reason not to let this user try to log on... */
253	return 1;
254}
255
256void
257auth_info(Authctxt *authctxt, const char *fmt, ...)
258{
259	va_list ap;
260        int i;
261
262	free(authctxt->info);
263	authctxt->info = NULL;
264
265	va_start(ap, fmt);
266	i = vasprintf(&authctxt->info, fmt, ap);
267	va_end(ap);
268
269	if (i < 0 || authctxt->info == NULL)
270		fatal("vasprintf failed");
271}
272
273void
274auth_log(Authctxt *authctxt, int authenticated, int partial,
275    const char *method, const char *submethod)
276{
277	void (*authlog) (const char *fmt,...) = verbose;
278	char *authmsg;
279
280	if (use_privsep && !mm_is_monitor() && !authctxt->postponed)
281		return;
282
283	/* Raise logging level */
284	if (authenticated == 1 ||
285	    !authctxt->valid ||
286	    authctxt->failures >= options.max_authtries / 2 ||
287	    strcmp(method, "password") == 0)
288		authlog = logit;
289
290	if (authctxt->postponed)
291		authmsg = "Postponed";
292	else if (partial)
293		authmsg = "Partial";
294	else
295		authmsg = authenticated ? "Accepted" : "Failed";
296
297	authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s",
298	    authmsg,
299	    method,
300	    submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod,
301	    authctxt->valid ? "" : "invalid user ",
302	    authctxt->user,
303	    get_remote_ipaddr(),
304	    get_remote_port(),
305	    compat20 ? "ssh2" : "ssh1",
306	    authctxt->info != NULL ? ": " : "",
307	    authctxt->info != NULL ? authctxt->info : "");
308	free(authctxt->info);
309	authctxt->info = NULL;
310
311#ifdef CUSTOM_FAILED_LOGIN
312	if (authenticated == 0 && !authctxt->postponed &&
313	    (strcmp(method, "password") == 0 ||
314	    strncmp(method, "keyboard-interactive", 20) == 0 ||
315	    strcmp(method, "challenge-response") == 0))
316		record_failed_login(authctxt->user,
317		    get_canonical_hostname(options.use_dns), "ssh");
318# ifdef WITH_AIXAUTHENTICATE
319	if (authenticated)
320		sys_auth_record_login(authctxt->user,
321		    get_canonical_hostname(options.use_dns), "ssh", &loginmsg);
322# endif
323#endif
324#ifdef SSH_AUDIT_EVENTS
325	if (authenticated == 0 && !authctxt->postponed)
326		audit_event(audit_classify_auth(method));
327#endif
328}
329
330
331void
332auth_maxtries_exceeded(Authctxt *authctxt)
333{
334	error("maximum authentication attempts exceeded for "
335	    "%s%.100s from %.200s port %d %s",
336	    authctxt->valid ? "" : "invalid user ",
337	    authctxt->user,
338	    get_remote_ipaddr(),
339	    get_remote_port(),
340	    compat20 ? "ssh2" : "ssh1");
341	packet_disconnect("Too many authentication failures");
342	/* NOTREACHED */
343}
344
345/*
346 * Check whether root logins are disallowed.
347 */
348int
349auth_root_allowed(const char *method)
350{
351	switch (options.permit_root_login) {
352	case PERMIT_YES:
353		return 1;
354	case PERMIT_NO_PASSWD:
355		if (strcmp(method, "publickey") == 0 ||
356		    strcmp(method, "hostbased") == 0 ||
357		    strcmp(method, "gssapi-with-mic") == 0)
358			return 1;
359		break;
360	case PERMIT_FORCED_ONLY:
361		if (forced_command) {
362			logit("Root login accepted for forced command.");
363			return 1;
364		}
365		break;
366	}
367	logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr());
368	return 0;
369}
370
371
372/*
373 * Given a template and a passwd structure, build a filename
374 * by substituting % tokenised options. Currently, %% becomes '%',
375 * %h becomes the home directory and %u the username.
376 *
377 * This returns a buffer allocated by xmalloc.
378 */
379char *
380expand_authorized_keys(const char *filename, struct passwd *pw)
381{
382	char *file, ret[PATH_MAX];
383	int i;
384
385	file = percent_expand(filename, "h", pw->pw_dir,
386	    "u", pw->pw_name, (char *)NULL);
387
388	/*
389	 * Ensure that filename starts anchored. If not, be backward
390	 * compatible and prepend the '%h/'
391	 */
392	if (*file == '/')
393		return (file);
394
395	i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file);
396	if (i < 0 || (size_t)i >= sizeof(ret))
397		fatal("expand_authorized_keys: path too long");
398	free(file);
399	return (xstrdup(ret));
400}
401
402char *
403authorized_principals_file(struct passwd *pw)
404{
405	if (options.authorized_principals_file == NULL)
406		return NULL;
407	return expand_authorized_keys(options.authorized_principals_file, pw);
408}
409
410/* return ok if key exists in sysfile or userfile */
411HostStatus
412check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host,
413    const char *sysfile, const char *userfile)
414{
415	char *user_hostfile;
416	struct stat st;
417	HostStatus host_status;
418	struct hostkeys *hostkeys;
419	const struct hostkey_entry *found;
420
421	hostkeys = init_hostkeys();
422	load_hostkeys(hostkeys, host, sysfile);
423	if (userfile != NULL) {
424		user_hostfile = tilde_expand_filename(userfile, pw->pw_uid);
425		if (options.strict_modes &&
426		    (stat(user_hostfile, &st) == 0) &&
427		    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
428		    (st.st_mode & 022) != 0)) {
429			logit("Authentication refused for %.100s: "
430			    "bad owner or modes for %.200s",
431			    pw->pw_name, user_hostfile);
432			auth_debug_add("Ignored %.200s: bad ownership or modes",
433			    user_hostfile);
434		} else {
435			temporarily_use_uid(pw);
436			load_hostkeys(hostkeys, host, user_hostfile);
437			restore_uid();
438		}
439		free(user_hostfile);
440	}
441	host_status = check_key_in_hostkeys(hostkeys, key, &found);
442	if (host_status == HOST_REVOKED)
443		error("WARNING: revoked key for %s attempted authentication",
444		    found->host);
445	else if (host_status == HOST_OK)
446		debug("%s: key for %s found at %s:%ld", __func__,
447		    found->host, found->file, found->line);
448	else
449		debug("%s: key for host %s not found", __func__, host);
450
451	free_hostkeys(hostkeys);
452
453	return host_status;
454}
455
456/*
457 * Check a given path for security. This is defined as all components
458 * of the path to the file must be owned by either the owner of
459 * of the file or root and no directories must be group or world writable.
460 *
461 * XXX Should any specific check be done for sym links ?
462 *
463 * Takes a file name, its stat information (preferably from fstat() to
464 * avoid races), the uid of the expected owner, their home directory and an
465 * error buffer plus max size as arguments.
466 *
467 * Returns 0 on success and -1 on failure
468 */
469int
470auth_secure_path(const char *name, struct stat *stp, const char *pw_dir,
471    uid_t uid, char *err, size_t errlen)
472{
473	char buf[PATH_MAX], homedir[PATH_MAX];
474	char *cp;
475	int comparehome = 0;
476	struct stat st;
477
478	if (realpath(name, buf) == NULL) {
479		snprintf(err, errlen, "realpath %s failed: %s", name,
480		    strerror(errno));
481		return -1;
482	}
483	if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
484		comparehome = 1;
485
486	if (!S_ISREG(stp->st_mode)) {
487		snprintf(err, errlen, "%s is not a regular file", buf);
488		return -1;
489	}
490	if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) ||
491	    (stp->st_mode & 022) != 0) {
492#if defined(ANDROID)
493		/* needed to allow root login on Android. */
494		if (getuid() != 0)
495#endif
496		{
497		snprintf(err, errlen, "bad ownership or modes for file %s",
498		    buf);
499		return -1;
500		}
501	}
502
503	/* for each component of the canonical path, walking upwards */
504	for (;;) {
505		if ((cp = dirname(buf)) == NULL) {
506			snprintf(err, errlen, "dirname() failed");
507			return -1;
508		}
509		strlcpy(buf, cp, sizeof(buf));
510
511#if !defined(ANDROID)
512		/* /data is owned by system user, which causes this check to fail */
513		if (stat(buf, &st) < 0 ||
514		    (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) ||
515		    (st.st_mode & 022) != 0) {
516			snprintf(err, errlen,
517			    "bad ownership or modes for directory %s", buf);
518			return -1;
519		}
520#endif
521
522		/* If are past the homedir then we can stop */
523		if (comparehome && strcmp(homedir, buf) == 0)
524			break;
525
526		/*
527		 * dirname should always complete with a "/" path,
528		 * but we can be paranoid and check for "." too
529		 */
530		if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
531			break;
532	}
533	return 0;
534}
535
536/*
537 * Version of secure_path() that accepts an open file descriptor to
538 * avoid races.
539 *
540 * Returns 0 on success and -1 on failure
541 */
542static int
543secure_filename(FILE *f, const char *file, struct passwd *pw,
544    char *err, size_t errlen)
545{
546	struct stat st;
547
548	/* check the open file to avoid races */
549	if (fstat(fileno(f), &st) < 0) {
550		snprintf(err, errlen, "cannot stat file %s: %s",
551		    file, strerror(errno));
552		return -1;
553	}
554	return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
555}
556
557static FILE *
558auth_openfile(const char *file, struct passwd *pw, int strict_modes,
559    int log_missing, char *file_type)
560{
561	char line[1024];
562	struct stat st;
563	int fd;
564	FILE *f;
565
566	if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) {
567		if (log_missing || errno != ENOENT)
568			debug("Could not open %s '%s': %s", file_type, file,
569			   strerror(errno));
570		return NULL;
571	}
572
573	if (fstat(fd, &st) < 0) {
574		close(fd);
575		return NULL;
576	}
577	if (!S_ISREG(st.st_mode)) {
578		logit("User %s %s %s is not a regular file",
579		    pw->pw_name, file_type, file);
580		close(fd);
581		return NULL;
582	}
583	unset_nonblock(fd);
584	if ((f = fdopen(fd, "r")) == NULL) {
585		close(fd);
586		return NULL;
587	}
588	if (strict_modes &&
589	    secure_filename(f, file, pw, line, sizeof(line)) != 0) {
590		fclose(f);
591		logit("Authentication refused: %s", line);
592		auth_debug_add("Ignored %s: %s", file_type, line);
593		return NULL;
594	}
595
596	return f;
597}
598
599
600FILE *
601auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes)
602{
603	return auth_openfile(file, pw, strict_modes, 1, "authorized keys");
604}
605
606FILE *
607auth_openprincipals(const char *file, struct passwd *pw, int strict_modes)
608{
609	return auth_openfile(file, pw, strict_modes, 0,
610	    "authorized principals");
611}
612
613struct passwd *
614getpwnamallow(const char *user)
615{
616#ifdef HAVE_LOGIN_CAP
617	extern login_cap_t *lc;
618#ifdef BSD_AUTH
619	auth_session_t *as;
620#endif
621#endif
622	struct passwd *pw;
623	struct connection_info *ci = get_connection_info(1, options.use_dns);
624
625	ci->user = user;
626	parse_server_match_config(&options, ci);
627
628#if defined(_AIX) && defined(HAVE_SETAUTHDB)
629	aix_setauthdb(user);
630#endif
631
632#if defined(ANDROID)
633	// Android has a fixed set of users. Any incoming user that we can't
634	// identify should be authenticated as the shell user.
635	if (strcmp(user, "root") && strcmp(user, "shell")) {
636		logit("Login name %.100s forced to shell", user);
637		user = "shell";
638	}
639#endif
640	pw = getpwnam(user);
641
642#if defined(_AIX) && defined(HAVE_SETAUTHDB)
643	aix_restoreauthdb();
644#endif
645#ifdef HAVE_CYGWIN
646	/*
647	 * Windows usernames are case-insensitive.  To avoid later problems
648	 * when trying to match the username, the user is only allowed to
649	 * login if the username is given in the same case as stored in the
650	 * user database.
651	 */
652	if (pw != NULL && strcmp(user, pw->pw_name) != 0) {
653		logit("Login name %.100s does not match stored username %.100s",
654		    user, pw->pw_name);
655		pw = NULL;
656	}
657#endif
658	if (pw == NULL) {
659		logit("Invalid user %.100s from %.100s",
660		    user, get_remote_ipaddr());
661#ifdef CUSTOM_FAILED_LOGIN
662		record_failed_login(user,
663		    get_canonical_hostname(options.use_dns), "ssh");
664#endif
665#ifdef SSH_AUDIT_EVENTS
666		audit_event(SSH_INVALID_USER);
667#endif /* SSH_AUDIT_EVENTS */
668		return (NULL);
669	}
670	if (!allowed_user(pw))
671		return (NULL);
672#ifdef HAVE_LOGIN_CAP
673	if ((lc = login_getclass(pw->pw_class)) == NULL) {
674		debug("unable to get login class: %s", user);
675		return (NULL);
676	}
677#ifdef BSD_AUTH
678	if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 ||
679	    auth_approval(as, lc, pw->pw_name, "ssh") <= 0) {
680		debug("Approval failure for %s", user);
681		pw = NULL;
682	}
683	if (as != NULL)
684		auth_close(as);
685#endif
686#endif
687	if (pw != NULL)
688		return (pwcopy(pw));
689	return (NULL);
690}
691
692/* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */
693int
694auth_key_is_revoked(Key *key)
695{
696	char *fp = NULL;
697	int r;
698
699	if (options.revoked_keys_file == NULL)
700		return 0;
701	if ((fp = sshkey_fingerprint(key, options.fingerprint_hash,
702	    SSH_FP_DEFAULT)) == NULL) {
703		r = SSH_ERR_ALLOC_FAIL;
704		error("%s: fingerprint key: %s", __func__, ssh_err(r));
705		goto out;
706	}
707
708	r = sshkey_check_revoked(key, options.revoked_keys_file);
709	switch (r) {
710	case 0:
711		break; /* not revoked */
712	case SSH_ERR_KEY_REVOKED:
713		error("Authentication key %s %s revoked by file %s",
714		    sshkey_type(key), fp, options.revoked_keys_file);
715		goto out;
716	default:
717		error("Error checking authentication key %s %s in "
718		    "revoked keys file %s: %s", sshkey_type(key), fp,
719		    options.revoked_keys_file, ssh_err(r));
720		goto out;
721	}
722
723	/* Success */
724	r = 0;
725
726 out:
727	free(fp);
728	return r == 0 ? 0 : 1;
729}
730
731void
732auth_debug_add(const char *fmt,...)
733{
734	char buf[1024];
735	va_list args;
736
737	if (!auth_debug_init)
738		return;
739
740	va_start(args, fmt);
741	vsnprintf(buf, sizeof(buf), fmt, args);
742	va_end(args);
743	buffer_put_cstring(&auth_debug, buf);
744}
745
746void
747auth_debug_send(void)
748{
749	char *msg;
750
751	if (!auth_debug_init)
752		return;
753	while (buffer_len(&auth_debug)) {
754		msg = buffer_get_string(&auth_debug, NULL);
755		packet_send_debug("%s", msg);
756		free(msg);
757	}
758}
759
760void
761auth_debug_reset(void)
762{
763	if (auth_debug_init)
764		buffer_clear(&auth_debug);
765	else {
766		buffer_init(&auth_debug);
767		auth_debug_init = 1;
768	}
769}
770
771struct passwd *
772fakepw(void)
773{
774	static struct passwd fake;
775
776	memset(&fake, 0, sizeof(fake));
777	fake.pw_name = "NOUSER";
778	fake.pw_passwd =
779	    "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK";
780#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
781	fake.pw_gecos = "NOUSER";
782#endif
783	fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid;
784	fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid;
785#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
786	fake.pw_class = "";
787#endif
788	fake.pw_dir = "/nonexist";
789	fake.pw_shell = "/nonexist";
790
791	return (&fake);
792}
793