[apple/network_cmds.git] / rpc_yppasswdd.tproj / passwd.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994, 1995
 *	The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej Exp $");
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <pwd.h>
#include <errno.h>
#include <paths.h>
#include <signal.h>
#include <limits.h>
#include <util.h>

static void	pw_cont __P((int sig));
static int	pw_equal __P((char *buf, struct passwd *old_pw));

int
pw_lock(retries)
	int retries;
{
	int i, fd;
	mode_t old_mode;

	/* Acquire the lock file. */
	old_mode = umask(0);
	fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 0600);
	for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) {
		sleep(1);
		fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL,
			  0600);
	}
	umask(old_mode);
	return(fd);
}

int
pw_mkdb()
{
	int pstat;
	pid_t pid;
	struct stat sb;

	/* A zero length passwd file is never ok */
	if (stat(_PATH_MASTERPASSWD_LOCK, &sb) == 0) {
		if (sb.st_size == 0) {
			warnx("%s is zero length", _PATH_MASTERPASSWD_LOCK);
			return (-1);
		}
	}

	pid = vfork();
	if (pid == 0) {
		execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p",
		      _PATH_MASTERPASSWD_LOCK, NULL);
		_exit(1);
	}
	pid = waitpid(pid, &pstat, 0);
	if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
		return(-1);
	return(0);
}

int
pw_abort()
{
	return(unlink(_PATH_MASTERPASSWD_LOCK));
}

/* Everything below this point is intended for the convenience of programs
 * which allow a user to interactively edit the passwd file.  Errors in the
 * routines below will cause the process to abort. */

static pid_t editpid = -1;

static void
pw_cont(sig)
	int sig;
{

	if (editpid != -1)
		kill(editpid, sig);
}

void
pw_init()
{
	struct rlimit rlim;

	/* Unlimited resource limits. */
	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
	(void)setrlimit(RLIMIT_CPU, &rlim);
	(void)setrlimit(RLIMIT_FSIZE, &rlim);
	(void)setrlimit(RLIMIT_STACK, &rlim);
	(void)setrlimit(RLIMIT_DATA, &rlim);
	(void)setrlimit(RLIMIT_RSS, &rlim);

	/* Don't drop core (not really necessary, but GP's). */
	rlim.rlim_cur = rlim.rlim_max = 0;
	(void)setrlimit(RLIMIT_CORE, &rlim);

	/* Turn off signals. */
	(void)signal(SIGALRM, SIG_IGN);
	(void)signal(SIGHUP, SIG_IGN);
	(void)signal(SIGINT, SIG_IGN);
	(void)signal(SIGPIPE, SIG_IGN);
	(void)signal(SIGQUIT, SIG_IGN);
	(void)signal(SIGTERM, SIG_IGN);
	(void)signal(SIGCONT, pw_cont);
}

void
pw_edit(notsetuid, filename)
	int notsetuid;
	const char *filename;
{
	int i, xargc, pstat;
	char *p, *editor;
	char **xargv;
#ifdef __GNUC__
	(void) &editor;
#endif

	if (filename == NULL)
		filename = _PATH_MASTERPASSWD_LOCK;
	if ((editor = getenv("EDITOR")) == NULL)
		editor = strdup(_PATH_VI);
	else
		editor = strdup(editor);
	if ((p = strrchr(editor, '/')))
		++p;
	else
		p = editor;

	/* Scan editor string, count spaces, allocate arg vector. */
	for (i = 0, xargc = 0; p[i] != '\0'; i++) {
		if (isspace(p[i])) {
			while (isspace(p[i++]))
				/* skip white space */ ;
			if (p[i] == '\0')
				break;
			xargc++;
		}
	}

	/* argv[0] + <xargc args> + filename + NULL */
	xargv = (char **)malloc(sizeof(char *) * (xargc + 3));
	if (xargv == NULL)
		pw_error("malloc failed", 1, 1);

	i = 0;
	xargv[i++] = p;
	for (; *p != '\0'; p++) {
		if (isspace(*p)) {
			while(isspace(*p))
				*p++ = '\0';	/* blast whitespace */
			if (*p == '\0')
				break;
			xargv[i++] = p;
		}
	}

	xargv[i++] = (char *)filename;
	xargv[i] = NULL;

	if (!(editpid = vfork())) {
		if (notsetuid) {
			setgid(getgid());
			setuid(getuid());
		}
		execvp(editor, xargv);
		_exit(1);
	}
	for (;;) {
		editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
		if (editpid == -1)
			pw_error(editor, 1, 1);
		else if (WIFSTOPPED(pstat))
			raise(WSTOPSIG(pstat));
		else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
			break;
		else
			pw_error(editor, 1, 1);
	}
	editpid = -1;
	free(editor);
	free(xargv);
}

void
pw_prompt()
{
	int c;

	(void)printf("re-edit the password file? [y]: ");
	(void)fflush(stdout);
	c = getchar();
	if (c != EOF && c != '\n')
		while (getchar() != '\n');
	if (c == 'n')
		pw_error(NULL, 0, 0);
}

/* for use in pw_copy(). Compare a pw entry to a pw struct. */
static int
pw_equal (buf, pw)
	char *buf;
	struct passwd *pw;
{
	struct passwd buf_pw;
	int len = strlen (buf);
	if (buf[len-1] == '\n')
		buf[len-1] = '\0';
	if (!pw_scan(buf, &buf_pw, NULL))
		return 0;
	return !strcmp(pw->pw_name, buf_pw.pw_name)
		&& pw->pw_uid == buf_pw.pw_uid
		&& pw->pw_gid == buf_pw.pw_gid
		&& !strcmp(pw->pw_class, buf_pw.pw_class)
		&& (long)pw->pw_change == (long)buf_pw.pw_change
		&& (long)pw->pw_expire == (long)buf_pw.pw_expire
		&& !strcmp(pw->pw_gecos, buf_pw.pw_gecos)
		&& !strcmp(pw->pw_dir, buf_pw.pw_dir)
		&& !strcmp(pw->pw_shell, buf_pw.pw_shell);
}

void
pw_copy(ffd, tfd, pw, old_pw)
	int ffd, tfd;
	struct passwd *pw, *old_pw;
{
	FILE *from, *to;
	int done;
	char *p, buf[8192];

	if (!(from = fdopen(ffd, "r")))
		pw_error(_PATH_MASTERPASSWD, 1, 1);
	if (!(to = fdopen(tfd, "w")))
		pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);

	for (done = 0; fgets(buf, sizeof(buf), from);) {
		if (!strchr(buf, '\n')) {
			warnx("%s: line too long", _PATH_MASTERPASSWD);
			pw_error(NULL, 0, 1);
		}
		if (done) {
			(void)fprintf(to, "%s", buf);
			if (ferror(to))
				goto err;
			continue;
		}
		if (buf[0] == '#') {
			/* skip comments for Rhapsody. */
			continue;
		}
		if (!(p = strchr(buf, ':'))) {
			warnx("%s: corrupted entry", _PATH_MASTERPASSWD);
			pw_error(NULL, 0, 1);
		}
		*p = '\0';
		if (strcmp(buf, pw->pw_name)) {
			*p = ':';
			(void)fprintf(to, "%s", buf);
			if (ferror(to))
				goto err;
			continue;
		}
		*p = ':';
		if (old_pw && !pw_equal(buf, old_pw)) {
			warnx("%s: entry inconsistent",
			      _PATH_MASTERPASSWD);
			pw_error(NULL, 0, 1);
		}
		(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
		    pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
		    pw->pw_class, (long)pw->pw_change, (long)pw->pw_expire,
		    pw->pw_gecos, pw->pw_dir, pw->pw_shell);
		done = 1;
		if (ferror(to))
			goto err;
	}
	/* Only append a new entry if real uid is root! */
	if (!done) 
		if (getuid() == 0)
			(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
			    pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
			    pw->pw_class, (long)pw->pw_change,
			    (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
			    pw->pw_shell);
		else
			warnx("%s: changes not made, no such entry",
		      	    _PATH_MASTERPASSWD);

	if (ferror(to))
err:		pw_error(NULL, 1, 1);
	(void)fclose(to);
}

int
pw_scan(bp, pw, flags)
	char *bp;
	struct passwd *pw;
	int *flags;
{
	unsigned long id;
	int root;
	char *p, *sh, *ep;

	if (flags != (int *)NULL)
		*flags = 0;

	if (!(pw->pw_name = strsep(&bp, ":")))		/* login */
		goto fmt;
	root = !strcmp(pw->pw_name, "root");

	if (!(pw->pw_passwd = strsep(&bp, ":")))	/* passwd */
		goto fmt;

	if (!(p = strsep(&bp, ":")))			/* uid */
		goto fmt;
	id = strtoul(p, &ep, 10);
	if (root && id) {
		warnx("root uid should be 0");
		return (0);
	}
	if (id > UID_MAX || *ep != '\0') {
		warnx("invalid uid '%s'", p);
		return (0);
	}
	pw->pw_uid = (uid_t)id;
	if ((*p == '\0') && (flags != (int *)NULL))
		*flags |= _PASSWORD_NOUID;

	if (!(p = strsep(&bp, ":")))			/* gid */
		goto fmt;
	id = strtoul(p, &ep, 10);
	if (id > GID_MAX || *ep != '\0') {
		warnx("invalid gid '%s'", p);
		return (0);
	}
	pw->pw_gid = (gid_t)id;
	if ((*p == '\0') && (flags != (int *)NULL))
		*flags |= _PASSWORD_NOGID;

	pw->pw_class = strsep(&bp, ":");		/* class */
	if (!(p = strsep(&bp, ":")))			/* change */
		goto fmt;
	pw->pw_change = atol(p);
	if ((*p == '\0') && (flags != (int *)NULL))
		*flags |= _PASSWORD_NOCHG;
	if (!(p = strsep(&bp, ":")))			/* expire */
		goto fmt;
	pw->pw_expire = atol(p);
	if ((*p == '\0') && (flags != (int *)NULL))
		*flags |= _PASSWORD_NOEXP;
	pw->pw_gecos = strsep(&bp, ":");		/* gecos */
	pw->pw_dir = strsep(&bp, ":");			/* directory */
	if (!(pw->pw_shell = strsep(&bp, ":")))		/* shell */
		goto fmt;

	p = pw->pw_shell;
	if (root && *p)					/* empty == /bin/sh */
		for (setusershell();;) {
			if (!(sh = getusershell())) {
				warnx("warning, unknown root shell");
				break;
			}
			if (!strcmp(p, sh))
				break;	
		}

	if ((p = strsep(&bp, ":"))) {			/* too many */
fmt:		warnx("corrupted entry");
		return (0);
	}

	return (1);
}

void
pw_error(name, err, eval)
	const char *name;
	int err, eval;
{
	if (err)
		warn(name);

	warnx("%s: unchanged", _PATH_MASTERPASSWD);
	pw_abort();
	exit(eval);
}
Commit	Line	Data
b7080c8e A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
ac2f15b3 A	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
	7	*
	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
b7080c8e A	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
ac2f15b3 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
b7080c8e A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* $NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej Exp $ */
	26
	27	/*
	28	* Copyright (c) 1987, 1993, 1994, 1995
	29	* The Regents of the University of California. All rights reserved.
	30	*
	31	* Redistribution and use in source and binary forms, with or without
	32	* modification, are permitted provided that the following conditions
	33	* are met:
	34	* 1. Redistributions of source code must retain the above copyright
	35	* notice, this list of conditions and the following disclaimer.
	36	* 2. Redistributions in binary form must reproduce the above copyright
	37	* notice, this list of conditions and the following disclaimer in the
	38	* documentation and/or other materials provided with the distribution.
	39	* 3. All advertising materials mentioning features or use of this software
	40	* must display the following acknowledgement:
	41	* This product includes software developed by the University of
	42	* California, Berkeley and its contributors.
	43	* 4. Neither the name of the University nor the names of its contributors
	44	* may be used to endorse or promote products derived from this software
	45	* without specific prior written permission.
	46	*
	47	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	48	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	49	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	50	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	51	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	52	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	53	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	54	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	55	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	56	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	57	* SUCH DAMAGE.
	58	*/
	59
	60	#include <sys/cdefs.h>
	61	#if defined(LIBC_SCCS) && !defined(lint)
	62	__RCSID("$NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej Exp $");
	63	#endif /* LIBC_SCCS and not lint */
	64
	65	#include <sys/types.h>
	66	#include <sys/stat.h>
	67	#include <sys/time.h>
	68	#include <sys/resource.h>
	69	#include <sys/wait.h>
	70
	71	#include <ctype.h>
	72	#include <err.h>
	73	#include <fcntl.h>
	74	#include <unistd.h>
	75	#include <stdlib.h>
	76	#include <stdio.h>
	77	#include <string.h>
	78	#include <pwd.h>
	79	#include <errno.h>
	80	#include <paths.h>
	81	#include <signal.h>
	82	#include <limits.h>
	83	#include <util.h>
	84
	85	static void pw_cont __P((int sig));
86	static int pw_equal __P((char buf, struct passwd old_pw));
87
88	int
89	pw_lock(retries)
90	int retries;
91	{
92	int i, fd;
93	mode_t old_mode;
94
95	/* Acquire the lock file. */
96	old_mode = umask(0);
97	fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY\|O_CREAT\|O_EXCL, 0600);
98	for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) {
99	sleep(1);
100	fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY\|O_CREAT\|O_EXCL,
101	0600);
102	}
103	umask(old_mode);
104	return(fd);
105	}
106
107	int
108	pw_mkdb()
109	{
110	int pstat;
111	pid_t pid;
112	struct stat sb;
113
114	/* A zero length passwd file is never ok */
115	if (stat(_PATH_MASTERPASSWD_LOCK, &sb) == 0) {
116	if (sb.st_size == 0) {
117	warnx("%s is zero length", _PATH_MASTERPASSWD_LOCK);
118	return (-1);
119	}
120	}
121
122	pid = vfork();
123	if (pid == 0) {
124	execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p",
125	_PATH_MASTERPASSWD_LOCK, NULL);
126	_exit(1);
127	}
128	pid = waitpid(pid, &pstat, 0);
129	if (pid == -1 \|\| !WIFEXITED(pstat) \|\| WEXITSTATUS(pstat) != 0)
130	return(-1);
131	return(0);
132	}
133
134	int
135	pw_abort()
136	{
137	return(unlink(_PATH_MASTERPASSWD_LOCK));
138	}
139
140	/* Everything below this point is intended for the convenience of programs
141	* which allow a user to interactively edit the passwd file. Errors in the
142	* routines below will cause the process to abort. */
143
144	static pid_t editpid = -1;
145
146	static void
147	pw_cont(sig)
148	int sig;
149	{
150
151	if (editpid != -1)
152	kill(editpid, sig);
153	}
154
155	void
156	pw_init()
157	{
158	struct rlimit rlim;
159
160	/* Unlimited resource limits. */
161	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
162	(void)setrlimit(RLIMIT_CPU, &rlim);
163	(void)setrlimit(RLIMIT_FSIZE, &rlim);
164	(void)setrlimit(RLIMIT_STACK, &rlim);
165	(void)setrlimit(RLIMIT_DATA, &rlim);
166	(void)setrlimit(RLIMIT_RSS, &rlim);
167
168	/* Don't drop core (not really necessary, but GP's). */
169	rlim.rlim_cur = rlim.rlim_max = 0;
170	(void)setrlimit(RLIMIT_CORE, &rlim);
171
172	/* Turn off signals. */
173	(void)signal(SIGALRM, SIG_IGN);
174	(void)signal(SIGHUP, SIG_IGN);
175	(void)signal(SIGINT, SIG_IGN);
176	(void)signal(SIGPIPE, SIG_IGN);
177	(void)signal(SIGQUIT, SIG_IGN);
178	(void)signal(SIGTERM, SIG_IGN);
179	(void)signal(SIGCONT, pw_cont);
180	}
181
182	void
183	pw_edit(notsetuid, filename)
184	int notsetuid;
185	const char *filename;
186	{
187	int i, xargc, pstat;
188	char p, editor;
189	char **xargv;
190	#ifdef __GNUC__
191	(void) &editor;
192	#endif
193
194	if (filename == NULL)
195	filename = _PATH_MASTERPASSWD_LOCK;
196	if ((editor = getenv("EDITOR")) == NULL)
197	editor = strdup(_PATH_VI);
198	else
199	editor = strdup(editor);
200	if ((p = strrchr(editor, '/')))
201	++p;
202	else
203	p = editor;
204
205	/* Scan editor string, count spaces, allocate arg vector. */
206	for (i = 0, xargc = 0; p[i] != '\0'; i++) {
207	if (isspace(p[i])) {
208	while (isspace(p[i++]))
209	/* skip white space */ ;
210	if (p[i] == '\0')
211	break;
212	xargc++;
213	}
214	}
215
216	/* argv[0] + <xargc args> + filename + NULL */
217	xargv = (char *)malloc(sizeof(char ) * (xargc + 3));
218	if (xargv == NULL)
219	pw_error("malloc failed", 1, 1);
220
221	i = 0;
222	xargv[i++] = p;
223	for (; *p != '\0'; p++) {
224	if (isspace(*p)) {
225	while(isspace(*p))
226	p++ = '\0'; / blast whitespace */
227	if (*p == '\0')
228	break;
229	xargv[i++] = p;
230	}
231	}
232
233	xargv[i++] = (char *)filename;
234	xargv[i] = NULL;
235
236	if (!(editpid = vfork())) {
237	if (notsetuid) {
238	setgid(getgid());
239	setuid(getuid());
240	}
241	execvp(editor, xargv);
242	_exit(1);
243	}
244	for (;;) {
245	editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
246	if (editpid == -1)
247	pw_error(editor, 1, 1);
248	else if (WIFSTOPPED(pstat))
249	raise(WSTOPSIG(pstat));
250	else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
251	break;
252	else
253	pw_error(editor, 1, 1);
254	}
255	editpid = -1;
256	free(editor);
257	free(xargv);
258	}
259
260	void
261	pw_prompt()
262	{
263	int c;
264
265	(void)printf("re-edit the password file? [y]: ");
266	(void)fflush(stdout);
267	c = getchar();
268	if (c != EOF && c != '\n')
269	while (getchar() != '\n');
270	if (c == 'n')
271	pw_error(NULL, 0, 0);
272	}
273
274	/* for use in pw_copy(). Compare a pw entry to a pw struct. */
275	static int
276	pw_equal (buf, pw)
277	char *buf;
278	struct passwd *pw;
279	{
280	struct passwd buf_pw;
281	int len = strlen (buf);
282	if (buf[len-1] == '\n')
283	buf[len-1] = '\0';
284	if (!pw_scan(buf, &buf_pw, NULL))
285	return 0;
286	return !strcmp(pw->pw_name, buf_pw.pw_name)
287	&& pw->pw_uid == buf_pw.pw_uid
288	&& pw->pw_gid == buf_pw.pw_gid
289	&& !strcmp(pw->pw_class, buf_pw.pw_class)
290	&& (long)pw->pw_change == (long)buf_pw.pw_change
291	&& (long)pw->pw_expire == (long)buf_pw.pw_expire
292	&& !strcmp(pw->pw_gecos, buf_pw.pw_gecos)
293	&& !strcmp(pw->pw_dir, buf_pw.pw_dir)
294	&& !strcmp(pw->pw_shell, buf_pw.pw_shell);
295	}
296
297	void
298	pw_copy(ffd, tfd, pw, old_pw)
299	int ffd, tfd;
300	struct passwd pw, old_pw;
301	{
302	FILE from, to;
303	int done;
304	char *p, buf[8192];
305
306	if (!(from = fdopen(ffd, "r")))
307	pw_error(_PATH_MASTERPASSWD, 1, 1);
308	if (!(to = fdopen(tfd, "w")))
309	pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);
310
311	for (done = 0; fgets(buf, sizeof(buf), from);) {
312	if (!strchr(buf, '\n')) {
313	warnx("%s: line too long", _PATH_MASTERPASSWD);
314	pw_error(NULL, 0, 1);
315	}
316	if (done) {
317	(void)fprintf(to, "%s", buf);
318	if (ferror(to))
319	goto err;
320	continue;
321	}
322	if (buf[0] == '#') {
323	/* skip comments for Rhapsody. */
324	continue;
325	}
326	if (!(p = strchr(buf, ':'))) {
327	warnx("%s: corrupted entry", _PATH_MASTERPASSWD);
328	pw_error(NULL, 0, 1);
329	}
330	*p = '\0';
331	if (strcmp(buf, pw->pw_name)) {
332	*p = ':';
333	(void)fprintf(to, "%s", buf);
334	if (ferror(to))
335	goto err;
336	continue;
337	}
338	*p = ':';
339	if (old_pw && !pw_equal(buf, old_pw)) {
340	warnx("%s: entry inconsistent",
341	_PATH_MASTERPASSWD);
342	pw_error(NULL, 0, 1);
343	}
344	(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
345	pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
346	pw->pw_class, (long)pw->pw_change, (long)pw->pw_expire,
347	pw->pw_gecos, pw->pw_dir, pw->pw_shell);
348	done = 1;
349	if (ferror(to))
350	goto err;
351	}
352	/* Only append a new entry if real uid is root! */
353	if (!done)
354	if (getuid() == 0)
355	(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
356	pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
357	pw->pw_class, (long)pw->pw_change,
358	(long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
359	pw->pw_shell);
360	else
361	warnx("%s: changes not made, no such entry",
362	_PATH_MASTERPASSWD);
363
364	if (ferror(to))
365	err: pw_error(NULL, 1, 1);
366	(void)fclose(to);
367	}
368
369	int
370	pw_scan(bp, pw, flags)
371	char *bp;
372	struct passwd *pw;
373	int *flags;
374	{
375	unsigned long id;
376	int root;
377	char p, sh, *ep;
378
379	if (flags != (int *)NULL)
380	*flags = 0;
381
382	if (!(pw->pw_name = strsep(&bp, ":"))) /* login */
383	goto fmt;
384	root = !strcmp(pw->pw_name, "root");
385
386	if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
387	goto fmt;
388
389	if (!(p = strsep(&bp, ":"))) /* uid */
390	goto fmt;
391	id = strtoul(p, &ep, 10);
392	if (root && id) {
393	warnx("root uid should be 0");
394	return (0);
395	}
396	if (id > UID_MAX \|\| *ep != '\0') {
397	warnx("invalid uid '%s'", p);
398	return (0);
399	}
400	pw->pw_uid = (uid_t)id;
401	if ((p == '\0') && (flags != (int )NULL))
402	*flags \|= _PASSWORD_NOUID;
403
404	if (!(p = strsep(&bp, ":"))) /* gid */
405	goto fmt;
406	id = strtoul(p, &ep, 10);
407	if (id > GID_MAX \|\| *ep != '\0') {
408	warnx("invalid gid '%s'", p);
409	return (0);
410	}
411	pw->pw_gid = (gid_t)id;
412	if ((p == '\0') && (flags != (int )NULL))
413	*flags \|= _PASSWORD_NOGID;
414
415	pw->pw_class = strsep(&bp, ":"); /* class */
416	if (!(p = strsep(&bp, ":"))) /* change */
417	goto fmt;
418	pw->pw_change = atol(p);
419	if ((p == '\0') && (flags != (int )NULL))
420	*flags \|= _PASSWORD_NOCHG;
421	if (!(p = strsep(&bp, ":"))) /* expire */
422	goto fmt;
423	pw->pw_expire = atol(p);
424	if ((p == '\0') && (flags != (int )NULL))
425	*flags \|= _PASSWORD_NOEXP;
426	pw->pw_gecos = strsep(&bp, ":"); /* gecos */
427	pw->pw_dir = strsep(&bp, ":"); /* directory */
428	if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
429	goto fmt;
430
431	p = pw->pw_shell;
432	if (root && p) / empty == /bin/sh */
433	for (setusershell();;) {
434	if (!(sh = getusershell())) {
435	warnx("warning, unknown root shell");
436	break;
437	}
438	if (!strcmp(p, sh))
439	break;
440	}
441
442	if ((p = strsep(&bp, ":"))) { /* too many */
443	fmt: warnx("corrupted entry");
444	return (0);
445	}
446
447	return (1);
448	}
449
450	void
451	pw_error(name, err, eval)
452	const char *name;
453	int err, eval;
454	{
455	if (err)
456	warn(name);
457
458	warnx("%s: unchanged", _PATH_MASTERPASSWD);
459	pw_abort();
460	exit(eval);
461	}
462