/usr/src/usr.sbin/user/user.c

Bug Summary

File:	src/usr.sbin/user/user.c
Warning:	line 1950, column 34 Null pointer passed as 1st argument to string length function
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name user.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.sbin/user/obj -resource-dir /usr/local/lib/clang/13.0.0 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.sbin/user/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.sbin/user/user.c
1/* $OpenBSD: user.c,v 1.128 2019/10/17 21:54:29 millert Exp $ */
2/* $NetBSD: user.c,v 1.69 2003/04/14 17:40:07 agc Exp $ */

4/*
* Copyright (c) 1999 Alistair G. Crooks.  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. The name of the author may not be used to endorse or promote
*    products derived from this software without specific prior written
*    permission.
*
* 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.
*/

32#include <sys/types.h>
33#include <sys/stat.h>

35#include <ctype.h>
36#include <dirent.h>
37#include <err.h>
38#include <errno(*__errno()).h>
39#include <fcntl.h>
40#include <grp.h>
41#include <limits.h>
42#include <login_cap.h>
43#include <paths.h>
44#include <pwd.h>
45#include <stdarg.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <syslog.h>
50#include <time.h>
51#include <unistd.h>
52#include <util.h>

54#include "usermgmt.h"


57/* this struct describes a uid range */
58typedef struct range_t {
uid_t	r_from;		/* low uid */
uid_t	r_to;		/* high uid */
61} range_t;

63/* this struct encapsulates the user information */
64typedef struct user_t {
int		u_flags;		/* see below */
uid_t		u_uid;			/* uid of user */
char	       *u_password;		/* encrypted password */
char	       *u_comment;		/* comment field */
char	       *u_home;		/* home directory */
char	       *u_primgrp;		/* primary group */
int		u_groupc;		/* # of secondary groups */
const char     *u_groupv[NGROUPS_MAX16];	/* secondary groups */
char	       *u_shell;		/* user's shell */
char	       *u_basedir;		/* base directory for home */
char	       *u_expire;		/* when account will expire */
char	       *u_inactive;		/* when password will expire */
char	       *u_skeldir;		/* directory for startup files */
char	       *u_class;		/* login class */
unsigned int	u_rsize;		/* size of range array */
unsigned int	u_rc;			/* # of ranges */
range_t	       *u_rv;			/* the ranges */
unsigned int	u_defrc;		/* # of ranges in defaults */
int		u_preserve;		/* preserve uids on deletion */
84} user_t;

86/* flags for which fields of the user_t replace the passwd entry */
87enum {
F_COMMENT	= 0x0001,
F_DUPUID	= 0x0002,
F_EXPIRE	= 0x0004,
F_GROUP		= 0x0008,
F_HOMEDIR	= 0x0010,
F_MKDIR		= 0x0020,
F_INACTIVE	= 0x0040,
F_PASSWORD	= 0x0080,
F_SECGROUP	= 0x0100,
F_SHELL		= 0x0200,
F_UID		= 0x0400,
F_USERNAME	= 0x0800,
F_CLASS		= 0x1000,
F_SETSECGROUP	= 0x4000,
F_ACCTLOCK	= 0x8000,
F_ACCTUNLOCK	= 0x10000
104};

106#define CONFFILE"/etc/usermgmt.conf"		"/etc/usermgmt.conf"
107#define _PATH_NONEXISTENT"/nonexistent"	"/nonexistent"

109#ifndef DEF_GROUP"=uid"
110#define DEF_GROUP"=uid"	"=uid"
111#endif

113#ifndef DEF_BASEDIR"/home"
114#define DEF_BASEDIR"/home"	"/home"
115#endif

117#ifndef DEF_SKELDIR"/etc/skel"
118#define DEF_SKELDIR"/etc/skel"	"/etc/skel"
119#endif

121#ifndef DEF_SHELL"/bin/ksh"
122#define DEF_SHELL"/bin/ksh"	_PATH_KSHELL"/bin/ksh"
123#endif

125#ifndef DEF_COMMENT""
126#define DEF_COMMENT""	""
127#endif

129#ifndef DEF_LOWUID1000
130#define DEF_LOWUID1000	1000
131#endif

133#ifndef DEF_HIGHUID60000
134#define DEF_HIGHUID60000	60000
135#endif

137#ifndef DEF_INACTIVE0
138#define DEF_INACTIVE0	0
139#endif

141#ifndef DEF_EXPIRE((void *)0)
142#define DEF_EXPIRE((void *)0)	NULL((void *)0)
143#endif

145#ifndef DEF_CLASS""
146#define DEF_CLASS""	""
147#endif

149#ifndef WAITSECS10
150#define WAITSECS10	10
151#endif

153#ifndef NOBODY_UID32767
154#define NOBODY_UID32767	32767
155#endif

157/* some useful constants */
158enum {
MaxShellNameLen = 256,
MaxFileNameLen = PATH_MAX1024,
MaxUserNameLen = _PW_NAME_LEN31,
MaxCommandLen = 2048,
PasswordLength = _PASSWORD_LEN128,
LowGid = DEF_LOWUID1000,
HighGid = DEF_HIGHUID60000
166};

168/* Full paths of programs used here */
169#define CHMOD"/bin/chmod"		"/bin/chmod"
170#define CHOWN"/sbin/chown"		"/sbin/chown"
171#define MKDIR"/bin/mkdir"		"/bin/mkdir"
172#define MV"/bin/mv"		"/bin/mv"
173#define NOLOGIN"/sbin/nologin"		"/sbin/nologin"
174#define PAX"/bin/pax"		"/bin/pax"
175#define RM"/bin/rm"		"/bin/rm"

177#define UNSET_INACTIVE"Null (unset)"	"Null (unset)"
178#define UNSET_EXPIRY"Null (unset)"	"Null (unset)"

180static int adduser(char *, user_t *);
181static int append_group(char *, int, const char **);
182static int asystem(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
184static int copydotfiles(char *, char *);
185static int creategid(char *, gid_t, const char *);
186static int getnextgid(uid_t *, uid_t, uid_t);
187static int getnextuid(int, uid_t *, uid_t, uid_t);
188static int is_local(char *, const char *);
189static int modify_gid(char *, char *);
190static int moduser(char *, char *, user_t *);
191static int removehomedir(const char *, uid_t, const char *);
192static int rm_user_from_groups(char *);
193static int save_range(user_t *, char *);
194static int scantime(time_t *, char *);
195static int setdefaults(user_t *);
196static int valid_class(char *);
197static int valid_group(char *);
198static int valid_login(char *);
199static size_t expand_len(const char *, const char *);
200static struct group *find_group_info(const char *);
201static struct passwd *find_user_info(const char *);
202static void checkeuid(void);
203static void memsave(char **, const char *, size_t);
204static void read_defaults(user_t *);

206static int	verbose;

208/* if *cpp is non-null, free it, then assign `n' chars of `s' to it */
209static void
210memsave(char **cpp, const char *s, size_t n)
211{
free(*cpp);
if ((*cpp = calloc (n + 1, sizeof(char))) == NULL((void *)0))
err(1, NULL((void *)0));
memcpy(*cpp, s, n);
(*cpp)[n] = '\0';
217}

219/* a replacement for system(3) */
220static int
221asystem(const char *fmt, ...)
222{
va_list	vp;
char	buf[MaxCommandLen];
int	ret;

va_start(vp, fmt)__builtin_va_start(vp, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, vp);
va_end(vp)__builtin_va_end(vp);
if (verbose) {
printf("Command: %s\n", buf);
}
if ((ret = system(buf)) != 0) {
warnx("[Warning] can't system `%s'", buf);
}
return ret;
237}

239/* remove a users home directory, returning 1 for success (ie, no problems encountered) */
240static int
241removehomedir(const char *user, uid_t uid, const char *dir)
242{
struct stat st;

/* userid not root? */
if (uid == 0) {
warnx("Not deleting home directory `%s'; userid is 0", dir);
return 0;
}

/* directory exists (and is a directory!) */
if (stat(dir, &st) == -1) {
warnx("Home directory `%s' doesn't exist", dir);
return 0;
}
if (!S_ISDIR(st.st_mode)((st.st_mode & 0170000) == 0040000)) {
warnx("Home directory `%s' is not a directory", dir);
return 0;
}

/* userid matches directory owner? */
if (st.st_uid != uid) {
warnx("User `%s' doesn't own directory `%s', not removed",
    user, dir);
return 0;
}

(void) seteuid(uid);
/* we add the "|| true" to keep asystem() quiet if there is a non-zero exit status. */
(void) asystem("%s -rf %s > /dev/null 2>&1 || true", RM"/bin/rm", dir);
(void) seteuid(0);
if (rmdir(dir) == -1) {
warnx("Unable to remove all files in `%s'", dir);
return 0;
}
return 1;
277}

279/*
* check that the effective uid is 0 - called from funcs which will
* modify data and config files.
*/
283static void
284checkeuid(void)
285{
if (geteuid() != 0) {
errx(EXIT_FAILURE1, "Program must be run as root");
}
289}

291/* copy any dot files into the user's home directory */
292static int
293copydotfiles(char *skeldir, char *dir)
294{
struct dirent	*dp;
DIR		*dirp;
int		n;

if (*skeldir == '\0')
return 0;
if ((dirp = opendir(skeldir)) == NULL((void *)0)) {
warn("can't open source . files dir `%s'", skeldir);
return 0;
}
for (n = 0; (dp = readdir(dirp)) != NULL((void *)0) && n == 0 ; ) {
if (strcmp(dp->d_name, ".") == 0 ||
    strcmp(dp->d_name, "..") == 0) {
	continue;
}
n = 1;
}
(void) closedir(dirp);
if (n == 0) {
warnx("No \"dot\" initialisation files found");
} else {
(void) asystem("cd %s && %s -rw -pe %s . %s",
		skeldir, PAX"/bin/pax", (verbose) ? "-v" : "", dir);
}
return n;
320}

322/* returns 1 if the specified gid exists in the group file, else 0 */
323static int
324gid_exists(gid_t gid)
325{
  return group_from_gid(gid, 1) != NULL((void *)0);
327}

329/* return 1 if the specified group exists in the group file, else 0 */
330static int
331group_exists(const char *group)
332{
  gid_t gid;

  return gid_from_group(group, &gid) != -1;
336}

338/* create a group entry with gid `gid' */
339static int
340creategid(char *group, gid_t gid, const char *name)
341{
struct stat	st;
FILE		*from;
FILE		*to;
char		*buf;
char		f[MaxFileNameLen];
int		fd, ret;
int		wroteit = 0;
size_t		len;

if (group_exists(group)) {
warnx("group `%s' already exists", group);
return 0;
}
if ((from = fopen(_PATH_GROUP"/etc/group", "r")) == NULL((void *)0)) {
warn("can't create gid for `%s': can't open `%s'", group,
    _PATH_GROUP"/etc/group");
return 0;
}
if (flock(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), LOCK_EX0x02 | LOCK_NB0x04) == -1) {
warn("can't lock `%s'", _PATH_GROUP"/etc/group");
}
(void) fstat(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP"/etc/group");
if ((fd = mkstemp(f)) == -1) {
warn("can't create gid: mkstemp failed");
fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL((void *)0)) {
warn("can't create gid: fdopen `%s' failed", f);
fclose(from);
close(fd);
unlink(f);
return 0;
}
while ((buf = fgetln(from, &len)) != NULL((void *)0) && len > 0) {
ret = 0;
if (buf[0] == '+' && wroteit == 0) {
	ret = fprintf(to, "%s:*:%u:%s\n", group, gid, name);
	wroteit = 1;
}
if (ret == -1 ||
    fprintf(to, "%*.*s", (int)len, (int)len, buf) != len) {
	warn("can't create gid: short write to `%s'", f);
	fclose(from);
	fclose(to);
	unlink(f);
	return 0;
}
}
ret = 0;
if (wroteit == 0)
ret = fprintf(to, "%s:*:%u:%s\n", group, gid, name);
fclose(from);
if (fclose(to) == EOF(-1) || ret == -1) {
warn("can't create gid: short write to `%s'", f);
unlink(f);
return 0;
}
if (rename(f, _PATH_GROUP"/etc/group") == -1) {
warn("can't create gid: can't rename `%s' to `%s'", f,
    _PATH_GROUP"/etc/group");
unlink(f);
return 0;
}
(void) chmod(_PATH_GROUP"/etc/group", st.st_mode & 0777);
syslog(LOG_INFO6, "new group added: name=%s, gid=%u", group, gid);
return 1;
410}

412/* modify the group entry with name `group' to be newent */
413static int
414modify_gid(char *group, char *newent)
415{
struct stat	st;
FILE		*from;
FILE		*to;
char		buf[LINE_MAX2048];
char		f[MaxFileNameLen];
char		*colon;
int		groupc;
int		entc;
int		fd;
int		cc;

if ((from = fopen(_PATH_GROUP"/etc/group", "r")) == NULL((void *)0)) {
warn("can't modify gid for `%s': can't open `%s'", group,
    _PATH_GROUP"/etc/group");
return 0;
}
if (flock(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), LOCK_EX0x02 | LOCK_NB0x04) == -1) {
warn("can't lock `%s'", _PATH_GROUP"/etc/group");
}
(void) fstat(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP"/etc/group");
if ((fd = mkstemp(f)) == -1) {
warn("can't modify gid: mkstemp failed");
fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL((void *)0)) {
warn("can't modify gid: fdopen `%s' failed", f);
fclose(from);
close(fd);
unlink(f);
return 0;
}
groupc = strlen(group);
while (fgets(buf, sizeof(buf), from) != NULL((void *)0)) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from))) {
	while (fgetc(from) != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from)))
		cc++;
	warnx("%s: line `%s' too long (%d bytes), skipping",
	    _PATH_GROUP"/etc/group", buf, cc);
	continue;
}
if ((colon = strchr(buf, ':')) == NULL((void *)0)) {
	/*
	 * The only valid entry with no column is the all-YP
	 * line.
	 */
	if (strcmp(buf, "+\n") != 0) {
		warnx("badly formed entry `%.*s'", cc - 1, buf);
		continue;
	}
} else {
	entc = (int)(colon - buf);
	if (entc == groupc && strncmp(group, buf, entc) == 0) {
		if (newent == NULL((void *)0)) {
			continue;
		} else {
			cc = strlcpy(buf, newent, sizeof(buf));
			if (cc >= sizeof(buf)) {
				warnx("group `%s' entry too long",
				    newent);
				fclose(from);
				fclose(to);
				unlink(f);
				return (0);
			}
		}
	}
}
if (fwrite(buf, cc, 1, to) != 1) {
	warn("can't modify gid: short write to `%s'", f);
	fclose(from);
	fclose(to);
	unlink(f);
	return 0;
}
}
fclose(from);
if (fclose(to) == EOF(-1)) {
warn("can't modify gid: short write to `%s'", f);
unlink(f);
return 0;
}
if (rename(f, _PATH_GROUP"/etc/group") == -1) {
warn("can't modify gid: can't rename `%s' to `%s'", f, _PATH_GROUP"/etc/group");
unlink(f);
return 0;
}
(void) chmod(_PATH_GROUP"/etc/group", st.st_mode & 0777);
if (newent == NULL((void *)0)) {
syslog(LOG_INFO6, "group deleted: name=%s", group);
} else {
syslog(LOG_INFO6, "group information modified: name=%s", group);
}
return 1;
512}

514/* modify the group entries for all `groups', by adding `user' */
515static int
516append_group(char *user, int ngroups, const char **groups)
517{
struct group	*grp;
struct passwd	*pwp;
struct stat	st;
FILE		*from;
FILE		*to;
char		buf[LINE_MAX2048];
char		f[MaxFileNameLen];
char		*colon;
const char	*ugid = NULL((void *)0);
int		fd;
int		cc;
int		i;
int		j;

if ((pwp = getpwnam(user))) {
if ((ugid = group_from_gid(pwp->pw_gid, 1)) == NULL((void *)0)) {
	warnx("can't get primary group for user `%s'", user);
	return 0;
}
}

for (i = 0 ; i < ngroups ; i++) {
if ((grp = getgrnam(groups[i])) == NULL((void *)0)) {
	warnx("can't append group `%s' for user `%s'",
	    groups[i], user);
} else {
	for (j = 0 ; grp->gr_mem[j] ; j++) {
		if (strcmp(user, grp->gr_mem[j]) == 0) {
			/* already in it */
			groups[i] = "";
		}
	}
}
}
if ((from = fopen(_PATH_GROUP"/etc/group", "r")) == NULL((void *)0)) {
warn("can't append group for `%s': can't open `%s'", user,
    _PATH_GROUP"/etc/group");
return 0;
}
if (flock(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), LOCK_EX0x02 | LOCK_NB0x04) == -1) {
warn("can't lock `%s'", _PATH_GROUP"/etc/group");
}
(void) fstat(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP"/etc/group");
if ((fd = mkstemp(f)) == -1) {
warn("can't append group: mkstemp failed");
fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL((void *)0)) {
warn("can't append group: fdopen `%s' failed", f);
fclose(from);
close(fd);
unlink(f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL((void *)0)) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from))) {
	while (fgetc(from) != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from)))
		cc++;
	warnx("%s: line `%s' too long (%d bytes), skipping",
	    _PATH_GROUP"/etc/group", buf, cc);
	continue;
}
if ((colon = strchr(buf, ':')) == NULL((void *)0)) {
	warnx("badly formed entry `%s'", buf);
	continue;
}
for (i = 0 ; i < ngroups ; i++) {
	j = (int)(colon - buf);
	if (ugid) {
		if (strcmp(ugid, groups[i]) == 0) {
			/* user's primary group, no need to append */
			groups[i] = "";
		}
	}
	if (strncmp(groups[i], buf, j) == 0 &&
	    groups[i][j] == '\0') {
		while (isspace((unsigned char)buf[cc - 1]))
			cc--;
		buf[(j = cc)] = '\0';
		if (buf[strlen(buf) - 1] != ':')
			strlcat(buf, ",", sizeof(buf));
		cc = strlcat(buf, user, sizeof(buf)) + 1;
		if (cc >= sizeof(buf)) {
			warnx("Warning: group `%s' would "
			    "become too long, not modifying",
			    groups[i]);
			cc = j + 1;
		}
		buf[cc - 1] = '\n';
		buf[cc] = '\0';
	}
}
if (fwrite(buf, cc, 1, to) != 1) {
	warn("can't append group: short write to `%s'", f);
	fclose(from);
	fclose(to);
	unlink(f);
	return 0;
}
}
fclose(from);
if (fclose(to) == EOF(-1)) {
warn("can't append group: short write to `%s'", f);
unlink(f);
return 0;
}
if (rename(f, _PATH_GROUP"/etc/group") == -1) {
warn("can't append group: can't rename `%s' to `%s'", f, _PATH_GROUP"/etc/group");
unlink(f);
return 0;
}
(void) chmod(_PATH_GROUP"/etc/group", st.st_mode & 0777);
return 1;
634}

636/* return 1 if `login' is a valid login name */
637static int
638valid_login(char *login_name)
639{
unsigned char	*cp;

/* The first character cannot be a hyphen */
if (*login_name == '-')
return 0;

for (cp = login_name ; *cp ; cp++) {
/* We allow '$' as the last character for samba */
if (!isalnum((unsigned char)*cp) && *cp != '.' &&
    *cp != '_' && *cp != '-' &&
    !(*cp == '$' && *(cp + 1) == '\0')) {
	return 0;
}
}
if ((char *)cp - login_name > MaxUserNameLen)
return 0;
return 1;
657}

659/* return 1 if `group' is a valid group name */
660static int
661valid_group(char *group)
662{
unsigned char	*cp;

for (cp = group ; *cp ; cp++) {
if (!isalnum((unsigned char)*cp) && *cp != '.' &&
    *cp != '_' && *cp != '-') {
	return 0;
}
}
if ((char *)cp - group > MaxUserNameLen)
return 0;
return 1;
674}

676/* return 1 if `class' exists */
677static int
678valid_class(char *class)
679{
login_cap_t *lc;

if ((lc = login_getclass(class)) != NULL((void *)0))
login_close(lc);
return lc != NULL((void *)0);
685}

687/* find the next gid in the range lo .. hi */
688static int
689getnextgid(uid_t *gidp, uid_t lo, uid_t hi)
690{
for (*gidp = lo ; *gidp < hi ; *gidp += 1) {
if (!gid_exists((gid_t)*gidp)) {
	return 1;
}
}
return 0;
697}

699/* save a range of uids */
700static int
701save_range(user_t *up, char *cp)
702{
uid_t	from;
uid_t	to;
int	i;

if (up->u_rc == up->u_rsize) {
up->u_rsize *= 2;
if ((up->u_rv = reallocarray(up->u_rv, up->u_rsize,
    sizeof(range_t))) == NULL((void *)0)) {
	warn(NULL((void *)0));
	return 0;
}
}
if (up->u_rv && sscanf(cp, "%u..%u", &from, &to) == 2) {
for (i = up->u_defrc ; i < up->u_rc ; i++) {
	if (up->u_rv[i].r_from == from && up->u_rv[i].r_to == to) {
		break;
	}
}
if (i == up->u_rc) {
	up->u_rv[up->u_rc].r_from = from;
	up->u_rv[up->u_rc].r_to = to;
	up->u_rc += 1;
}
} else {
warnx("Bad uid range `%s'", cp);
return 0;
}
return 1;
731}

733/* set the defaults in the defaults file */
734static int
735setdefaults(user_t *up)
736{
char	template[MaxFileNameLen];
FILE	*fp;
int	ret;
int	fd;
int	i;

(void) snprintf(template, sizeof(template), "%s.XXXXXXXX", CONFFILE"/etc/usermgmt.conf");
if ((fd = mkstemp(template)) == -1) {
warnx("can't mkstemp `%s' for writing", CONFFILE"/etc/usermgmt.conf");
return 0;
}
if ((fp = fdopen(fd, "w")) == NULL((void *)0)) {
warn("can't fdopen `%s' for writing", CONFFILE"/etc/usermgmt.conf");
return 0;
}
ret = 1;
if (fprintf(fp, "group\t\t%s\n", up->u_primgrp) <= 0 ||
   fprintf(fp, "base_dir\t%s\n", up->u_basedir) <= 0 ||
   fprintf(fp, "skel_dir\t%s\n", up->u_skeldir) <= 0 ||
   fprintf(fp, "shell\t\t%s\n", up->u_shell) <= 0 ||
   fprintf(fp, "class\t\t%s\n", up->u_class) <= 0 ||
   fprintf(fp, "inactive\t%s\n", (up->u_inactive == NULL((void *)0)) ? UNSET_INACTIVE"Null (unset)" : up->u_inactive) <= 0 ||
   fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL((void *)0)) ? UNSET_EXPIRY"Null (unset)" : up->u_expire) <= 0 ||
   fprintf(fp, "preserve\t%s\n", (up->u_preserve == 0) ? "false" : "true") <= 0) {
warn("can't write to `%s'", CONFFILE"/etc/usermgmt.conf");
ret = 0;
}
for (i = (up->u_defrc != up->u_rc) ? up->u_defrc : 0 ; i < up->u_rc ; i++) {
if (fprintf(fp, "range\t\t%u..%u\n", up->u_rv[i].r_from, up->u_rv[i].r_to) <= 0) {
	warn("can't write to `%s'", CONFFILE"/etc/usermgmt.conf");
	ret = 0;
}
}
if (fclose(fp) == EOF(-1)) {
warn("can't write to `%s'", CONFFILE"/etc/usermgmt.conf");
ret = 0;
}
if (ret) {
ret = ((rename(template, CONFFILE"/etc/usermgmt.conf") == 0) && (chmod(CONFFILE"/etc/usermgmt.conf", 0644) == 0));
}
return ret;
778}

780/* read the defaults file */
781static void
782read_defaults(user_t *up)
783{
struct stat	st;
size_t		lineno;
size_t		len;
FILE		*fp;
unsigned char	*cp;
unsigned char	*s;

memsave(&up->u_primgrp, DEF_GROUP"=uid", strlen(DEF_GROUP"=uid"));
memsave(&up->u_basedir, DEF_BASEDIR"/home", strlen(DEF_BASEDIR"/home"));
memsave(&up->u_skeldir, DEF_SKELDIR"/etc/skel", strlen(DEF_SKELDIR"/etc/skel"));
memsave(&up->u_shell, DEF_SHELL"/bin/ksh", strlen(DEF_SHELL"/bin/ksh"));
memsave(&up->u_comment, DEF_COMMENT"", strlen(DEF_COMMENT""));
memsave(&up->u_class, DEF_CLASS"", strlen(DEF_CLASS""));
up->u_rsize = 16;
up->u_defrc = 0;
if ((up->u_rv = calloc(up->u_rsize, sizeof(range_t))) == NULL((void *)0))
err(1, NULL((void *)0));
up->u_inactive = DEF_INACTIVE0;
up->u_expire = DEF_EXPIRE((void *)0);
if ((fp = fopen(CONFFILE"/etc/usermgmt.conf", "r")) == NULL((void *)0)) {
if (stat(CONFFILE"/etc/usermgmt.conf", &st) == -1 && !setdefaults(up)) {
	warn("can't create `%s' defaults file", CONFFILE"/etc/usermgmt.conf");
}
fp = fopen(CONFFILE"/etc/usermgmt.conf", "r");
}
if (fp != NULL((void *)0)) {
while ((s = fparseln(fp, &len, &lineno, NULL((void *)0), 0)) != NULL((void *)0)) {
	if (strncmp(s, "group", 5) == 0) {
		for (cp = s + 5 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_primgrp, cp, strlen(cp));
	} else if (strncmp(s, "base_dir", 8) == 0) {
		for (cp = s + 8 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_basedir, cp, strlen(cp));
	} else if (strncmp(s, "skel_dir", 8) == 0) {
		for (cp = s + 8 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_skeldir, cp, strlen(cp));
	} else if (strncmp(s, "shell", 5) == 0) {
		for (cp = s + 5 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_shell, cp, strlen(cp));
	} else if (strncmp(s, "password", 8) == 0) {
		for (cp = s + 8 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_password, cp, strlen(cp));
	} else if (strncmp(s, "class", 5) == 0) {
		for (cp = s + 5 ; isspace((unsigned char)*cp); cp++) {
		}
		memsave(&up->u_class, cp, strlen(cp));
	} else if (strncmp(s, "inactive", 8) == 0) {
		for (cp = s + 8 ; isspace((unsigned char)*cp); cp++) {
		}
		if (strcmp(cp, UNSET_INACTIVE"Null (unset)") == 0) {
			free(up->u_inactive);
			up->u_inactive = NULL((void *)0);
		} else {
			memsave(&up->u_inactive, cp, strlen(cp));
		}
	} else if (strncmp(s, "range", 5) == 0) {
		for (cp = s + 5 ; isspace((unsigned char)*cp); cp++) {
		}
		(void) save_range(up, cp);
	} else if (strncmp(s, "preserve", 8) == 0) {
		for (cp = s + 8 ; isspace((unsigned char)*cp); cp++) {
		}
		up->u_preserve = (strncmp(cp, "true", 4) == 0) ? 1 :
				  (strncmp(cp, "yes", 3) == 0) ? 1 :
				   strtonum(cp, INT_MIN(-2147483647 -1), INT_MAX2147483647, NULL((void *)0));
	} else if (strncmp(s, "expire", 6) == 0) {
		for (cp = s + 6 ; isspace((unsigned char)*cp); cp++) {
		}
		if (strcmp(cp, UNSET_EXPIRY"Null (unset)") == 0) {
			free(up->u_expire);
			up->u_expire = NULL((void *)0);
		} else {
			memsave(&up->u_expire, cp, strlen(cp));
		}
	}
	free(s);
}
fclose(fp);
}
if (up->u_rc == 0) {
up->u_rv[up->u_rc].r_from = DEF_LOWUID1000;
up->u_rv[up->u_rc].r_to = DEF_HIGHUID60000;
up->u_rc += 1;
}
up->u_defrc = up->u_rc;
874}

876/* return 1 if the specified uid exists in the passwd file, else 0 */
877static int
878uid_exists(uid_t uid)
879{
  return user_from_uid(uid, 1) != NULL((void *)0);
881}

883/* return 1 if the specified user exists in the passwd file, else 0 */
884static int
885user_exists(const char *user)
886{
  uid_t uid;

  return uid_from_user(user, &uid) != -1;
890}

892/* return the next valid unused uid */
893static int
894getnextuid(int sync_uid_gid, uid_t *uid, uid_t low_uid, uid_t high_uid)
895{
for (*uid = low_uid ; *uid <= high_uid ; (*uid)++) {
if (!uid_exists((uid_t)*uid) && *uid != NOBODY_UID32767) {
	if (sync_uid_gid) {
		if (!gid_exists((gid_t)*uid)) {
			return 1;
		}
	} else {
		return 1;
	}
}
}
return 0;
908}

910/* look for a valid time, return 0 if it was specified but bad */
911static int
912scantime(time_t *tp, char *s)
913{
struct tm	tm;

*tp = 0;
if (s != NULL((void *)0)) {
memset(&tm, 0, sizeof(tm));
tm.tm_isdst = -1;
if (strptime(s, "%c", &tm) != NULL((void *)0)) {
	*tp = mktime(&tm);
} else if (strptime(s, "%B %d %Y", &tm) != NULL((void *)0)) {
	*tp = mktime(&tm);
} else if (isdigit((unsigned char) s[0]) != 0) {
	*tp = (time_t)atoll(s);
} else {
	return 0;
}
}
return 1;
931}

933/* compute the extra length '&' expansion consumes */
934static size_t
935expand_len(const char *p, const char *username)
936{
size_t alen;
size_t ulen;

ulen = strlen(username);
for (alen = 0; *p != '\0'; p++)
if (*p == '&')
	alen += ulen - 1;
return alen;
945}

947/* see if we can find out the user struct */
948static struct passwd *
949find_user_info(const char *name)
950{
struct passwd	*pwp;
const char	*errstr;
uid_t		uid;

if ((pwp = getpwnam(name)) == NULL((void *)0)) {
uid = strtonum(name, -1, UID_MAX(2147483647 *2U +1U), &errstr);
if (errstr == NULL((void *)0))
	pwp = getpwuid(uid);
}
return pwp;
961}

963/* see if we can find out the group struct */
964static struct group *
965find_group_info(const char *name)
966{
struct group	*grp;
const char	*errstr;
gid_t		gid;

if ((grp = getgrnam(name)) == NULL((void *)0)) {
gid = strtonum(name, -1, GID_MAX(2147483647 *2U +1U), &errstr);
if (errstr == NULL((void *)0))
	grp = getgrgid(gid);
}
return grp;
977}

979/* add a user */
980static int
981adduser(char *login_name, user_t *up)
982{
struct group	*grp;
struct stat	st;
time_t		expire;
time_t		inactive;
char		password[PasswordLength + 1];
char		home[MaxFileNameLen];
char		buf[LINE_MAX2048];
int		sync_uid_gid;
int		masterfd;
int		ptmpfd;
gid_t		gid;
int		cc;
int		i, yp = 0;
FILE		*fp;

if (!valid_login(login_name)) {
errx(EXIT_FAILURE1, "`%s' is not a valid login name", login_name);
}
if (!valid_class(up->u_class)) {
errx(EXIT_FAILURE1, "No such login class `%s'", up->u_class);
}
if ((masterfd = open(_PATH_MASTERPASSWD"/etc/master.passwd", O_RDONLY0x0000)) == -1) {
err(EXIT_FAILURE1, "can't open `%s'", _PATH_MASTERPASSWD"/etc/master.passwd");
}
if (flock(masterfd, LOCK_EX0x02 | LOCK_NB0x04) == -1) {
err(EXIT_FAILURE1, "can't lock `%s'", _PATH_MASTERPASSWD"/etc/master.passwd");
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS10)) == -1) {
int saved_errno = errno(*__errno());
close(masterfd);
errc(EXIT_FAILURE1, saved_errno, "can't obtain pw_lock");
}
if ((fp = fdopen(masterfd, "r")) == NULL((void *)0)) {
int saved_errno = errno(*__errno());
close(masterfd);
close(ptmpfd);
pw_abort();
errc(EXIT_FAILURE1, saved_errno,
    "can't fdopen `%s' for reading", _PATH_MASTERPASSWD"/etc/master.passwd");
}
while (fgets(buf, sizeof(buf), fp) != NULL((void *)0)) {
cc = strlen(buf);
/*
 * Stop copying the file at the yp entry; we want to
 * put the new user before it, and preserve entries
 * after the yp entry.
 */
if (cc > 1 && buf[0] == '+' && buf[1] == ':') {
	yp = 1;
	break;
}
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
	int saved_errno = errno(*__errno());
	fclose(fp);
	close(ptmpfd);
	pw_abort();
	errc(EXIT_FAILURE1, saved_errno,
	    "short write to /etc/ptmp (not %d chars)", cc);
}
}
if (ferror(fp)(!__isthreaded ? (((fp)->_flags & 0x0040) != 0) : (ferror
)(fp))) {
int saved_errno = errno(*__errno());
fclose(fp);
close(ptmpfd);
pw_abort();
errc(EXIT_FAILURE1, saved_errno, "read error on %s",
    _PATH_MASTERPASSWD"/etc/master.passwd");
}
/* if no uid was specified, get next one in [low_uid..high_uid] range */
sync_uid_gid = (strcmp(up->u_primgrp, "=uid") == 0);
if (up->u_uid == -1) {
int got_id = 0;

/*
 * Look for a free UID in the command line ranges (if any).
 * These start after the ranges specified in the config file.
 */
for (i = up->u_defrc; got_id == 0 && i < up->u_rc ; i++) {
	got_id = getnextuid(sync_uid_gid, &up->u_uid,
	    up->u_rv[i].r_from, up->u_rv[i].r_to);
}
/*
 * If there were no free UIDs in the command line ranges,
 * try the ranges from the config file (there will always
 * be at least one default).
 */
if (got_id == 0) {
	for (i = 0; got_id == 0 && i < up->u_defrc; i++) {
		got_id = getnextuid(sync_uid_gid, &up->u_uid,
		    up->u_rv[i].r_from, up->u_rv[i].r_to);
	}
}
if (got_id == 0) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "can't get next uid for %u", up->u_uid);
}
}
/* check uid isn't already allocated */
if (!(up->u_flags & F_DUPUID) && uid_exists((uid_t)up->u_uid)) {
close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE1, "uid %u is already in use", up->u_uid);
}
/* if -g=uid was specified, check gid is unused */
if (sync_uid_gid) {
if (gid_exists((gid_t)up->u_uid)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "gid %u is already in use", up->u_uid);
}
gid = up->u_uid;
} else {
if ((grp = find_group_info(up->u_primgrp)) == NULL((void *)0)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "group %s not found", up->u_primgrp);
}
gid = grp->gr_gid;
}
/* check name isn't already in use */
if (!(up->u_flags & F_DUPUID) && user_exists(login_name)) {
close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE1, "already a `%s' user", login_name);
}
if (up->u_flags & F_HOMEDIR) {
if (strlcpy(home, up->u_home, sizeof(home)) >= sizeof(home)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "home directory `%s' too long",
	    up->u_home);
}
} else {
/* if home directory hasn't been given, make it up */
if (snprintf(home, sizeof(home), "%s/%s", up->u_basedir,
    login_name) >= sizeof(home)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "home directory `%s/%s' too long",
	    up->u_basedir, login_name);
}
}
if (!scantime(&inactive, up->u_inactive)) {
warnx("Warning: inactive time `%s' invalid, password expiry off",
		up->u_inactive);
}
if (!scantime(&expire, up->u_expire)) {
warnx("Warning: expire time `%s' invalid, account expiry off",
		up->u_expire);
}
if (lstat(home, &st) == -1 && !(up->u_flags & F_MKDIR) &&
   strcmp(home, _PATH_NONEXISTENT"/nonexistent") != 0) {
warnx("Warning: home directory `%s' doesn't exist, and -m was"
    " not specified", home);
}
(void) strlcpy(password, up->u_password ? up->u_password : "*",
   sizeof(password));
cc = snprintf(buf, sizeof(buf), "%s:%s:%u:%u:%s:%lld:%lld:%s:%s:%s\n",
   login_name,
   password,
   up->u_uid,
   gid,
   up->u_class,
   (long long) inactive,
   (long long) expire,
   up->u_comment,
   home,
   up->u_shell);
if (cc >= sizeof(buf) || cc < 0 ||
   cc + expand_len(up->u_comment, login_name) >= 1023) {
close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE1, "can't add `%s', line too long", buf);
}
if (write(ptmpfd, buf, (size_t) cc) != cc) {
int saved_errno = errno(*__errno());
close(ptmpfd);
pw_abort();
errc(EXIT_FAILURE1, saved_errno, "can't add `%s'", buf);
}
if (yp) {
/* put back the + line */
cc = snprintf(buf, sizeof(buf), "+:*::::::::\n");
if (cc < 0 || cc >= sizeof(buf)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "can't add `%s', line too long", buf);
}
if (write(ptmpfd, buf, (size_t) cc) != cc) {
	int saved_errno = errno(*__errno());
	close(ptmpfd);
	pw_abort();
	errc(EXIT_FAILURE1, saved_errno, "can't add `%s'", buf);
}
/* copy the entries following it, if any */
while (fgets(buf, sizeof(buf), fp) != NULL((void *)0)) {
	cc = strlen(buf);
	if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
		int saved_errno = errno(*__errno());
		fclose(fp);
		close(ptmpfd);
		pw_abort();
		errc(EXIT_FAILURE1, saved_errno,
		    "short write to /etc/ptmp (not %d chars)",
		    cc);
	}
}
if (ferror(fp)(!__isthreaded ? (((fp)->_flags & 0x0040) != 0) : (ferror
)(fp))) {
	int saved_errno = errno(*__errno());
	fclose(fp);
	close(ptmpfd);
	pw_abort();
	errc(EXIT_FAILURE1, saved_errno, "read error on %s",
	    _PATH_MASTERPASSWD"/etc/master.passwd");
}
}
if (up->u_flags & F_MKDIR) {
if (lstat(home, &st) == 0) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "home directory `%s' already exists",
	    home);
} else {
	if (asystem("%s -p %s", MKDIR"/bin/mkdir", home) != 0) {
		int saved_errno = errno(*__errno());
		close(ptmpfd);
		pw_abort();
		errc(EXIT_FAILURE1, saved_errno,
		    "can't mkdir `%s'", home);
	}
	(void) copydotfiles(up->u_skeldir, home);
	(void) asystem("%s -R -P %u:%u %s", CHOWN"/sbin/chown", up->u_uid,
	    gid, home);
	(void) asystem("%s -R u+w %s", CHMOD"/bin/chmod", home);
}
}
if (strcmp(up->u_primgrp, "=uid") == 0 && !group_exists(login_name) &&
   !creategid(login_name, gid, "")) {
close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE1, "can't create gid %u for login name %s",
    gid, login_name);
}
if (up->u_groupc > 0 && !append_group(login_name, up->u_groupc, up->u_groupv)) {
close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE1, "can't append `%s' to new groups", login_name);
}
fclose(fp);
close(ptmpfd);
if (pw_mkdb(yp ? NULL((void *)0) : login_name, 0) == -1) {
pw_abort();
err(EXIT_FAILURE1, "pw_mkdb failed");
}
syslog(LOG_INFO6, "new user added: name=%s, uid=%u, gid=%u, home=%s, shell=%s",
login_name, up->u_uid, gid, home, up->u_shell);
return 1;
1242}

1244/* remove a user from the groups file */
1245static int
1246rm_user_from_groups(char *login_name)
1247{
struct stat	st;
size_t		login_len;
FILE		*from;
FILE		*to;
char		buf[LINE_MAX2048];
char		f[MaxFileNameLen];
char		*cp, *ep;
int		fd;
int		cc;

login_len = strlen(login_name);
if ((from = fopen(_PATH_GROUP"/etc/group", "r")) == NULL((void *)0)) {
warn("can't remove gid for `%s': can't open `%s'",
    login_name, _PATH_GROUP"/etc/group");
return 0;
}
if (flock(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), LOCK_EX0x02 | LOCK_NB0x04) == -1) {
warn("can't lock `%s'", _PATH_GROUP"/etc/group");
}
(void) fstat(fileno(from)(!__isthreaded ? ((from)->_file) : (fileno)(from)), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP"/etc/group");
if ((fd = mkstemp(f)) == -1) {
warn("can't remove gid for `%s': mkstemp failed", login_name);
fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL((void *)0)) {
warn("can't remove gid for `%s': fdopen `%s' failed",
    login_name, f);
fclose(from);
close(fd);
unlink(f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL((void *)0)) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from))) {
	while (fgetc(from) != '\n' && !feof(from)(!__isthreaded ? (((from)->_flags & 0x0020) != 0) : (feof
)(from)))
		cc++;
	warnx("%s: line `%s' too long (%d bytes), skipping",
	    _PATH_GROUP"/etc/group", buf, cc);
	continue;
}

/* Break out the group list. */
for (cp = buf, cc = 0; *cp != '\0' && cc < 3; cp++) {
	if (*cp == ':')
		cc++;
}
if (cc != 3) {
	buf[strcspn(buf, "\n")] = '\0';
	warnx("Malformed entry `%s'. Skipping", buf);
	continue;
}
while ((cp = strstr(cp, login_name)) != NULL((void *)0)) {
	if ((cp[-1] == ':' || cp[-1] == ',') &&
	    (cp[login_len] == ',' || cp[login_len] == '\n')) {
		ep = cp + login_len;
		if (cp[login_len] == ',')
			ep++;
		else if (cp[-1] == ',')
			cp--;
		memmove(cp, ep, strlen(ep) + 1);
	} else {
		if ((cp = strchr(cp, ',')) == NULL((void *)0))
			break;
		cp++;
	}
}
if (fwrite(buf, strlen(buf), 1, to) != 1) {
	warn("can't remove gid for `%s': short write to `%s'",
	    login_name, f);
	fclose(from);
	fclose(to);
	unlink(f);
	return 0;
}
}
(void) fchmod(fileno(to)(!__isthreaded ? ((to)->_file) : (fileno)(to)), st.st_mode & 0777);
fclose(from);
if (fclose(to) == EOF(-1)) {
warn("can't remove gid for `%s': short write to `%s'",
    login_name, f);
unlink(f);
return 0;
}
if (rename(f, _PATH_GROUP"/etc/group") == -1) {
warn("can't remove gid for `%s': can't rename `%s' to `%s'",
    login_name, f, _PATH_GROUP"/etc/group");
unlink(f);
return 0;
}
return 1;
1341}

1343/* check that the user or group is local, not from YP/NIS */
1344static int
1345is_local(char *name, const char *file)
1346{
FILE		*fp;
char		buf[LINE_MAX2048];
size_t		len;
int		ret;
int		cc;

if ((fp = fopen(file, "r")) == NULL((void *)0)) {
err(EXIT_FAILURE1, "can't open `%s'", file);
}
len = strlen(name);
for (ret = 0 ; fgets(buf, sizeof(buf), fp) != NULL((void *)0) ; ) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(fp)(!__isthreaded ? (((fp)->_flags & 0x0020) != 0) : (feof
)(fp))) {
	while (fgetc(fp) != '\n' && !feof(fp)(!__isthreaded ? (((fp)->_flags & 0x0020) != 0) : (feof
)(fp)))
		cc++;
	warnx("%s: line `%s' too long (%d bytes), skipping",
	    file, buf, cc);
	continue;
}
if (strncmp(buf, name, len) == 0 && buf[len] == ':') {
	ret = 1;
	break;
}
}
fclose(fp);
return ret;
1373}

1375/* modify a user */
1376static int
1377moduser(char *login_name, char *newlogin, user_t *up)
1378{
struct passwd	*pwp = NULL((void *)0);
struct group	*grp;
const char	*homedir;
char		buf[LINE_MAX2048];
char		acctlock_str[] = "-";
char		pwlock_str[] = "*";
char		pw_len[PasswordLength + 1];
char		shell_len[MaxShellNameLen];
char		*shell_last_char;
size_t		colonc, loginc;
size_t		cc;
size_t		shell_buf;
FILE		*master;
char		newdir[MaxFileNameLen];
char		*colon;
char		*pw_tmp = NULL((void *)0);
char		*shell_tmp = NULL((void *)0);
int		len;
int		locked = 0;
int		unlocked = 0;
int		masterfd;
int		ptmpfd;
int		rval;
int		i;

if (!valid_login(newlogin)) {
errx(EXIT_FAILURE1, "`%s' is not a valid login name", login_name);
}
if ((pwp = getpwnam_shadow(login_name)) == NULL((void *)0)) {
errx(EXIT_FAILURE1, "No such user `%s'", login_name);
}
if (up != NULL((void *)0)) {
if ((*pwp->pw_passwd != '\0') &&
    (up->u_flags & F_PASSWORD) == 0) {
	up->u_flags |= F_PASSWORD;
	memsave(&up->u_password, pwp->pw_passwd,
	    strlen(pwp->pw_passwd));
	explicit_bzero(pwp->pw_passwd, strlen(pwp->pw_passwd));
}
}
endpwent();

if (pledge("stdio rpath wpath cpath fattr flock proc exec getpw id",
   NULL((void *)0)) == -1)
err(1, "pledge");

if (!is_local(login_name, _PATH_MASTERPASSWD"/etc/master.passwd")) {
errx(EXIT_FAILURE1, "User `%s' must be a local user", login_name);
}
if (up != NULL((void *)0)) {
if ((up->u_flags & (F_ACCTLOCK | F_ACCTUNLOCK)) && (pwp->pw_uid < 1000))
	errx(EXIT_FAILURE1, "(un)locking is not supported for the `%s' account", pwp->pw_name);
}
/* keep dir name in case we need it for '-m' */
homedir = pwp->pw_dir;

/* get the last char of the shell in case we need it for '-U' or '-Z' */
shell_last_char = pwp->pw_shell+strlen(pwp->pw_shell) - 1;

if ((masterfd = open(_PATH_MASTERPASSWD"/etc/master.passwd", O_RDONLY0x0000)) == -1) {
err(EXIT_FAILURE1, "can't open `%s'", _PATH_MASTERPASSWD"/etc/master.passwd");
}
if (flock(masterfd, LOCK_EX0x02 | LOCK_NB0x04) == -1) {
err(EXIT_FAILURE1, "can't lock `%s'", _PATH_MASTERPASSWD"/etc/master.passwd");
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS10)) == -1) {
int saved_errno = errno(*__errno());
close(masterfd);
errc(EXIT_FAILURE1, saved_errno, "can't obtain pw_lock");
}
if ((master = fdopen(masterfd, "r")) == NULL((void *)0)) {
int saved_errno = errno(*__errno());
close(masterfd);
close(ptmpfd);
pw_abort();
errc(EXIT_FAILURE1, saved_errno, "can't fdopen fd for %s",
    _PATH_MASTERPASSWD"/etc/master.passwd");
}
if (up != NULL((void *)0)) {
if (up->u_flags & F_USERNAME) {
	/* if changing name, check new name isn't already in use */
	if (strcmp(login_name, newlogin) != 0 &&
	    user_exists(newlogin)) {
		close(ptmpfd);
		pw_abort();
		errx(EXIT_FAILURE1, "already a `%s' user", newlogin);
	}
	pwp->pw_name = newlogin;

	/*
	 * Provide a new directory name in case the
	 * home directory is to be moved.
	 */
	if (up->u_flags & F_MKDIR) {
		(void) snprintf(newdir, sizeof(newdir),
		    "%s/%s", up->u_basedir, newlogin);
		pwp->pw_dir = newdir;
	}
}
if (up->u_flags & F_PASSWORD) {
	if (up->u_password != NULL((void *)0))
		pwp->pw_passwd = up->u_password;
}
if (up->u_flags & F_ACCTLOCK) {
	/* lock the account */
	if (*shell_last_char != *acctlock_str) {
		shell_tmp = malloc(strlen(pwp->pw_shell) + sizeof(acctlock_str));
		if (shell_tmp == NULL((void *)0)) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "account lock: cannot allocate memory");
		}
		strlcpy(shell_tmp, pwp->pw_shell, sizeof(shell_len));
		strlcat(shell_tmp, acctlock_str, sizeof(shell_len));
		pwp->pw_shell = shell_tmp;
	} else {
		locked++;
	}
	/* lock the password */
	if (strncmp(pwp->pw_passwd, pwlock_str, sizeof(pwlock_str)-1) != 0) {
		pw_tmp = malloc(strlen(pwp->pw_passwd) + sizeof(pwlock_str));
		if (pw_tmp == NULL((void *)0)) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "password lock: cannot allocate memory");
		}
		strlcpy(pw_tmp, pwlock_str, sizeof(pw_len));
		strlcat(pw_tmp, pwp->pw_passwd, sizeof(pw_len));
		pwp->pw_passwd = pw_tmp;
	} else {
		locked++;
	}

	if (locked > 1)
		warnx("account `%s' is already locked", pwp->pw_name);
}
if (up->u_flags & F_ACCTUNLOCK) {
	/* unlock the password */
	if (strcmp(pwp->pw_passwd, pwlock_str) != 0 &&
	    strcmp(pwp->pw_passwd, "*************") != 0) {
		if (strncmp(pwp->pw_passwd, pwlock_str, sizeof(pwlock_str)-1) == 0) {
			pwp->pw_passwd += sizeof(pwlock_str)-1;
		} else {
			unlocked++;
		}
	} else {
		warnx("account `%s' has no password: cannot fully unlock", pwp->pw_name);
	}
	/* unlock the account */
	if (*shell_last_char == *acctlock_str) {
		shell_buf = strlen(pwp->pw_shell) + 2 - sizeof(acctlock_str);
		shell_tmp = malloc(shell_buf);
		if (shell_tmp == NULL((void *)0)) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "unlock: cannot allocate memory");
		}
		strlcpy(shell_tmp, pwp->pw_shell, shell_buf);
		pwp->pw_shell = shell_tmp;
	} else {
		unlocked++;
	}

	if (unlocked > 1)
		warnx("account `%s' is not locked", pwp->pw_name);
}
if (up->u_flags & F_UID) {
	/* check uid isn't already allocated */
	if (!(up->u_flags & F_DUPUID) &&
	    uid_exists((uid_t)up->u_uid)) {
		close(ptmpfd);
		pw_abort();
		errx(EXIT_FAILURE1, "uid %u is already in use", up->u_uid);
	}
	pwp->pw_uid = up->u_uid;
}
if (up->u_flags & F_GROUP) {
	/* if -g=uid was specified, check gid is unused */
	if (strcmp(up->u_primgrp, "=uid") == 0) {
		if (gid_exists((gid_t)pwp->pw_uid)) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "gid %u is already "
			    "in use", pwp->pw_uid);
		}
		pwp->pw_gid = pwp->pw_uid;
		if (!creategid(newlogin, pwp->pw_gid, "")) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "could not create "
			    "group %s with gid %u", newlogin,
			    pwp->pw_gid);
		}
	} else {
		if ((grp = find_group_info(up->u_primgrp)) == NULL((void *)0)) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "group %s not found",
			    up->u_primgrp);
		}
		pwp->pw_gid = grp->gr_gid;
	}
}
if (up->u_flags & F_INACTIVE) {
	if (!scantime(&pwp->pw_change, up->u_inactive)) {
		warnx("Warning: inactive time `%s' invalid, password expiry off",
			up->u_inactive);
	}
}
if (up->u_flags & F_EXPIRE) {
	if (!scantime(&pwp->pw_expire, up->u_expire)) {
		warnx("Warning: expire time `%s' invalid, account expiry off",
			up->u_expire);
	}
}
if (up->u_flags & F_COMMENT)
	pwp->pw_gecos = up->u_comment;
if (up->u_flags & F_HOMEDIR)
	pwp->pw_dir = up->u_home;
if (up->u_flags & F_SHELL)
	pwp->pw_shell = up->u_shell;
if (up->u_flags & F_CLASS) {
	if (!valid_class(up->u_class)) {
		close(ptmpfd);
		pw_abort();
		errx(EXIT_FAILURE1,
		    "No such login class `%s'", up->u_class);
	}
	pwp->pw_class = up->u_class;
}
}
loginc = strlen(login_name);
while (fgets(buf, sizeof(buf), master) != NULL((void *)0)) {
if ((colon = strchr(buf, ':')) == NULL((void *)0)) {
	warnx("Malformed entry `%s'. Skipping", buf);
	continue;
}
colonc = (size_t)(colon - buf);
if (strncmp(login_name, buf, loginc) == 0 && loginc == colonc) {
	if (up != NULL((void *)0)) {
		if ((len = snprintf(buf, sizeof(buf),
		    "%s:%s:%u:%u:%s:%lld:%lld:%s:%s:%s\n",
		    newlogin,
		    pwp->pw_passwd,
		    pwp->pw_uid,
		    pwp->pw_gid,
		    pwp->pw_class,
		    (long long)pwp->pw_change,
		    (long long)pwp->pw_expire,
		    pwp->pw_gecos,
		    pwp->pw_dir,
		    pwp->pw_shell)) >= sizeof(buf) || len < 0 ||
		    len + expand_len(pwp->pw_gecos, newlogin)
		    >= 1023) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1, "can't add `%s', "
			    "line too long (%zu bytes)", buf,
			    len + expand_len(pwp->pw_gecos,
			    newlogin));
		}
		if (write(ptmpfd, buf, len) != len) {
			int saved_errno = errno(*__errno());
			close(ptmpfd);
			pw_abort();
			errc(EXIT_FAILURE1, saved_errno,
			    "can't add `%s'", buf);
		}
	}
} else {
	len = strlen(buf);
	if ((cc = write(ptmpfd, buf, len)) != len) {
		int saved_errno = errno(*__errno());
		close(masterfd);
		close(ptmpfd);
		pw_abort();
		errc(EXIT_FAILURE1, saved_errno,
		    "short write to /etc/ptmp (%lld not %lld chars)",
		    (long long)cc, (long long)len);
	}
}
}
if (up != NULL((void *)0)) {
if ((up->u_flags & F_MKDIR) &&
    asystem("%s %s %s", MV"/bin/mv", homedir, pwp->pw_dir) != 0) {
	int saved_errno = errno(*__errno());
	close(ptmpfd);
	pw_abort();
	errc(EXIT_FAILURE1, saved_errno,
	    "can't move `%s' to `%s'", homedir, pwp->pw_dir);
}
if (up->u_flags & F_SETSECGROUP) {
	for (i = 0 ; i < up->u_groupc ; i++) {
		if (!group_exists(up->u_groupv[i])) {
			close(ptmpfd);
			pw_abort();
			errx(EXIT_FAILURE1,
			    "aborting, group `%s' does not exist",
			    up->u_groupv[i]);
		}
	}
	if (!rm_user_from_groups(newlogin)) {
		close(ptmpfd);
		pw_abort();
		errx(EXIT_FAILURE1,
		    "can't reset groups for `%s'", newlogin);
	}
}
if (up->u_groupc > 0) {
    if (!append_group(newlogin, up->u_groupc, up->u_groupv)) {
	close(ptmpfd);
	pw_abort();
	errx(EXIT_FAILURE1, "can't append `%s' to new groups",
	    newlogin);
    }
}
}
fclose(master);
close(ptmpfd);
free(pw_tmp);
free(shell_tmp);
if (up != NULL((void *)0) && strcmp(login_name, newlogin) == 0)
rval = pw_mkdb(login_name, 0);
else
rval = pw_mkdb(NULL((void *)0), 0);
if (rval == -1) {
pw_abort();
err(EXIT_FAILURE1, "pw_mkdb failed");
}
if (up == NULL((void *)0)) {
syslog(LOG_INFO6, "user removed: name=%s", login_name);
} else if (strcmp(login_name, newlogin) == 0) {
syslog(LOG_INFO6, "user information modified: name=%s, uid=%u, gid=%u, home=%s, shell=%s",
	login_name, pwp->pw_uid, pwp->pw_gid, pwp->pw_dir, pwp->pw_shell);
} else {
syslog(LOG_INFO6, "user information modified: name=%s, new name=%s, uid=%u, gid=%u, home=%s, shell=%s",
	login_name, newlogin, pwp->pw_uid, pwp->pw_gid, pwp->pw_dir, pwp->pw_shell);
}
return 1;
1719}

1721/* print out usage message, and then exit */
1722void
1723usermgmt_usage(const char *prog)
1724{
if (strcmp(prog, "useradd") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s -D [-b base-directory] "
    "[-e expiry-time] [-f inactive-time]\n"
    "               [-g gid | name | =uid] [-k skel-directory] "
    "[-L login-class]\n"
    "               [-r low..high] [-s shell]\n", prog);
fprintf(stderr(&__sF[2]), "       %s [-mov] [-b base-directory] "
    "[-c comment] [-d home-directory]\n"
    "               [-e expiry-time] [-f inactive-time]\n"
    "               [-G secondary-group[,group,...]] "
    "[-g gid | name | =uid]\n"
    "               [-k skel-directory] [-L login-class] "
    "[-p password] [-r low..high]\n"
    "               [-s shell] [-u uid] user\n", prog);
} else if (strcmp(prog, "usermod") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-moUvZ] "
    "[-c comment] [-d home-directory] [-e expiry-time]\n"
    "               [-f inactive-time] "
    "[-G secondary-group[,group,...]]\n"
    "               [-g gid | name | =uid] [-L login-class] "
    "[-l new-login]\n"
    "               [-p password] "
    "[-S secondary-group[,group,...]]\n"
    "               [-s shell] [-u uid] user\n",
    prog);
} else if (strcmp(prog, "userdel") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s -D [-p preserve-value]\n",
    prog);
fprintf(stderr(&__sF[2]), "       %s [-rv] [-p preserve-value] "
    "user\n", prog);
} else if (strcmp(prog, "userinfo") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-e] user\n", prog);
} else if (strcmp(prog, "groupadd") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-ov] [-g gid] group\n",
    prog);
} else if (strcmp(prog, "groupdel") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-v] group\n", prog);
} else if (strcmp(prog, "groupmod") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-ov] [-g gid] [-n newname] "
    "group\n", prog);
} else if (strcmp(prog, "user") == 0 || strcmp(prog, "group") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [add | del | mod"
" | info"
"] ...\n",
    prog);
} else if (strcmp(prog, "groupinfo") == 0) {
fprintf(stderr(&__sF[2]), "usage: %s [-e] group\n", prog);
} else {
fprintf(stderr(&__sF[2]), "This program must be called as {user,group}{add,del,mod,info},\n%s is not an understood name.\n", prog);
}
exit(EXIT_FAILURE1);
1776}

1778int
1779useradd(int argc, char **argv)
1780{
user_t	u;
const char *errstr;
int	defaultfield;
int	bigD;
int	c;
int	i;

memset(&u, 0, sizeof(u));
read_defaults(&u);
u.u_uid = -1;
defaultfield = bigD = 0;
while ((c = getopt(argc, argv, "DG:L:b:c:d:e:f:g:k:mop:r:s:u:v")) != -1) {
switch(c) {
case 'D':
	bigD = 1;
	break;
case 'G':
	while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL((void *)0) &&
	    u.u_groupc < NGROUPS_MAX16 - 2) {
		if (u.u_groupv[u.u_groupc][0] != 0) {
			u.u_groupc++;
		}
	}
	if (optarg != NULL((void *)0)) {
		warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX16 - 2);
	}
	break;
case 'b':
	defaultfield = 1;
	memsave(&u.u_basedir, optarg, strlen(optarg));
	break;
case 'c':
	memsave(&u.u_comment, optarg, strlen(optarg));
	break;
case 'd':
	memsave(&u.u_home, optarg, strlen(optarg));
	u.u_flags |= F_HOMEDIR;
	break;
case 'e':
	defaultfield = 1;
	memsave(&u.u_expire, optarg, strlen(optarg));
	break;
case 'f':
	defaultfield = 1;
	memsave(&u.u_inactive, optarg, strlen(optarg));
	break;
case 'g':
	defaultfield = 1;
	memsave(&u.u_primgrp, optarg, strlen(optarg));
	break;
case 'k':
	defaultfield = 1;
	memsave(&u.u_skeldir, optarg, strlen(optarg));
	break;
case 'L':
	defaultfield = 1;
	memsave(&u.u_class, optarg, strlen(optarg));
	break;
case 'm':
	u.u_flags |= F_MKDIR;
	break;
case 'o':
	u.u_flags |= F_DUPUID;
	break;
case 'p':
	memsave(&u.u_password, optarg, strlen(optarg));
	explicit_bzero(optarg, strlen(optarg));
	break;
case 'r':
	defaultfield = 1;
	if (!save_range(&u, optarg))
		exit(EXIT_FAILURE1);
	break;
case 's':
	defaultfield = 1;
	memsave(&u.u_shell, optarg, strlen(optarg));
	break;
case 'u':
	u.u_uid = strtonum(optarg, -1, UID_MAX(2147483647 *2U +1U), &errstr);
	if (errstr != NULL((void *)0)) {
		errx(EXIT_FAILURE1, "When using [-u uid], the uid must be numeric");
	}
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("useradd");
}
}

if (pledge("stdio rpath wpath cpath fattr flock proc exec getpw id",
   NULL((void *)0)) == -1)
err(1, "pledge");

if (bigD) {
if (defaultfield) {
	checkeuid();
	return setdefaults(&u) ? EXIT_SUCCESS0 : EXIT_FAILURE1;
}
printf("group\t\t%s\n", u.u_primgrp);
printf("base_dir\t%s\n", u.u_basedir);
printf("skel_dir\t%s\n", u.u_skeldir);
printf("shell\t\t%s\n", u.u_shell);
printf("class\t\t%s\n", u.u_class);
printf("inactive\t%s\n", (u.u_inactive == NULL((void *)0)) ? UNSET_INACTIVE"Null (unset)" : u.u_inactive);
printf("expire\t\t%s\n", (u.u_expire == NULL((void *)0)) ? UNSET_EXPIRY"Null (unset)" : u.u_expire);
for (i = 0 ; i < u.u_rc ; i++) {
	printf("range\t\t%u..%u\n", u.u_rv[i].r_from, u.u_rv[i].r_to);
}
return EXIT_SUCCESS0;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("useradd");
}
checkeuid();
openlog("useradd", LOG_PID0x01, LOG_USER(1<<3));
return adduser(*argv, &u) ? EXIT_SUCCESS0 : EXIT_FAILURE1;
1901}

1903int
1904usermod(int argc, char **argv)
1905{
user_t	u;
char	newuser[MaxUserNameLen + 1];
int	c, have_new_user;
const char *errstr;

memset(&u, 0, sizeof(u));
memset(newuser, 0, sizeof(newuser));
read_defaults(&u);
free(u.u_primgrp);
u.u_primgrp = NULL((void *)0);
have_new_user = 0;
while ((c = getopt(argc, argv, "G:L:S:UZc:d:e:f:g:l:mop:s:u:v")) != -1) {
1
Assuming the condition is true→
2
←
Loop condition is true.  Entering loop body→
9
←
Assuming the condition is true→
10
←
Loop condition is true.  Entering loop body→
switch(c) {
3
←
Control jumps to 'case 83:'  at line 1931→
11
←
Control jumps to 'case 99:'  at line 1949→
case 'G':
	while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL((void *)0) &&
	    u.u_groupc < NGROUPS_MAX16 - 2) {
		if (u.u_groupv[u.u_groupc][0] != 0) {
			u.u_groupc++;
		}
	}
	if (optarg != NULL((void *)0)) {
		warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX16 - 2);
	}
	u.u_flags |= F_SECGROUP;
	break;
case 'S':
	while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL((void *)0) &&
4
←
Value assigned to 'optarg'→
5
←
Assuming the condition is false→
	    u.u_groupc < NGROUPS_MAX16 - 2) {
		if (u.u_groupv[u.u_groupc][0] != 0) {
			u.u_groupc++;
		}
	}
	if (optarg != NULL((void *)0)) {
6
←
Assuming 'optarg' is equal to NULL→
7
←
Taking false branch→
		warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX16 - 2);
	}
	u.u_flags |= F_SETSECGROUP;
	break;
8
←
 Execution continues on line 1917→
case 'U':
	u.u_flags |= F_ACCTUNLOCK;
	break;
case 'Z':
	u.u_flags |= F_ACCTLOCK;
	break;
case 'c':
	memsave(&u.u_comment, optarg, strlen(optarg));
12
←
Null pointer passed as 1st argument to string length function
	u.u_flags |= F_COMMENT;
	break;
case 'd':
	memsave(&u.u_home, optarg, strlen(optarg));
	u.u_flags |= F_HOMEDIR;
	break;
case 'e':
	memsave(&u.u_expire, optarg, strlen(optarg));
	u.u_flags |= F_EXPIRE;
	break;
case 'f':
	memsave(&u.u_inactive, optarg, strlen(optarg));
	u.u_flags |= F_INACTIVE;
	break;
case 'g':
	memsave(&u.u_primgrp, optarg, strlen(optarg));
	u.u_flags |= F_GROUP;
	break;
case 'l':
	if (strlcpy(newuser, optarg, sizeof(newuser)) >=
	    sizeof(newuser))
		errx(EXIT_FAILURE1, "username `%s' too long",
		    optarg);
	have_new_user = 1;
	u.u_flags |= F_USERNAME;
	break;
case 'L':
	memsave(&u.u_class, optarg, strlen(optarg));
	u.u_flags |= F_CLASS;
	break;
case 'm':
	u.u_flags |= F_MKDIR;
	break;
case 'o':
	u.u_flags |= F_DUPUID;
	break;
case 'p':
	memsave(&u.u_password, optarg, strlen(optarg));
	explicit_bzero(optarg, strlen(optarg));
	u.u_flags |= F_PASSWORD;
	break;
case 's':
	memsave(&u.u_shell, optarg, strlen(optarg));
	u.u_flags |= F_SHELL;
	break;
case 'u':
	u.u_uid = strtonum(optarg, -1, UID_MAX(2147483647 *2U +1U), &errstr);
	u.u_flags |= F_UID;
	if (errstr != NULL((void *)0)) {
		errx(EXIT_FAILURE1, "When using [-u uid], the uid must be numeric");
	}
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("usermod");
}
}

if ((u.u_flags & F_MKDIR) && !(u.u_flags & F_HOMEDIR) &&
   !(u.u_flags & F_USERNAME)) {
warnx("option 'm' useless without 'd' or 'l' -- ignored");
u.u_flags &= ~F_MKDIR;
}
if ((u.u_flags & F_SECGROUP) && (u.u_flags & F_SETSECGROUP))
errx(EXIT_FAILURE1, "options 'G' and 'S' are mutually exclusive");
if ((u.u_flags & F_ACCTLOCK) && (u.u_flags & F_ACCTUNLOCK))
errx(EXIT_FAILURE1, "options 'U' and 'Z' are mutually exclusive");
if ((u.u_flags & F_PASSWORD) && (u.u_flags & (F_ACCTLOCK | F_ACCTUNLOCK)))
errx(EXIT_FAILURE1, "options 'U' or 'Z' with 'p' are mutually exclusive");
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("usermod");
}
checkeuid();
openlog("usermod", LOG_PID0x01, LOG_USER(1<<3));
return moduser(*argv, (have_new_user) ? newuser : *argv, &u) ?
   EXIT_SUCCESS0 : EXIT_FAILURE1;
2031}

2033int
2034userdel(int argc, char **argv)
2035{
struct passwd	*pwp;
user_t		u;
int		defaultfield;
int		rmhome;
int		bigD;
int		c;

memset(&u, 0, sizeof(u));
read_defaults(&u);
defaultfield = bigD = rmhome = 0;
while ((c = getopt(argc, argv, "Dp:rv")) != -1) {
switch(c) {
case 'D':
	bigD = 1;
	break;
case 'p':
	defaultfield = 1;
	u.u_preserve = (strcmp(optarg, "true") == 0) ? 1 :
			(strcmp(optarg, "yes") == 0) ? 1 :
			 strtonum(optarg, INT_MIN(-2147483647 -1), INT_MAX2147483647, NULL((void *)0));
	break;
case 'r':
	rmhome = 1;
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("userdel");
}
}
if (bigD) {
if (defaultfield) {
	checkeuid();
	return setdefaults(&u) ? EXIT_SUCCESS0 : EXIT_FAILURE1;
}
printf("preserve\t%s\n", (u.u_preserve) ? "true" : "false");
return EXIT_SUCCESS0;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userdel");
}

if (pledge("stdio rpath wpath cpath fattr flock proc exec getpw id",
   NULL((void *)0)) == -1)
err(1, "pledge");

checkeuid();
if ((pwp = getpwnam(*argv)) == NULL((void *)0)) {
warnx("No such user `%s'", *argv);
return EXIT_FAILURE1;
}
if (rmhome)
(void)removehomedir(pwp->pw_name, pwp->pw_uid, pwp->pw_dir);
if (u.u_preserve) {
u.u_flags |= F_SHELL;
memsave(&u.u_shell, NOLOGIN"/sbin/nologin", strlen(NOLOGIN"/sbin/nologin"));
memsave(&u.u_password, "*", strlen("*"));
u.u_flags |= F_PASSWORD;
openlog("userdel", LOG_PID0x01, LOG_USER(1<<3));
return moduser(*argv, *argv, &u) ? EXIT_SUCCESS0 : EXIT_FAILURE1;
}
if (!rm_user_from_groups(*argv)) {
return 0;
}
openlog("userdel", LOG_PID0x01, LOG_USER(1<<3));
return moduser(*argv, *argv, NULL((void *)0)) ? EXIT_SUCCESS0 : EXIT_FAILURE1;
2105}

2107/* add a group */
2108int
2109groupadd(int argc, char **argv)
2110{
int	dupgid;
int	gid;
int	c;
const char *errstr;

gid = -1;
dupgid = 0;
while ((c = getopt(argc, argv, "g:ov")) != -1) {
switch(c) {
case 'g':
	gid = strtonum(optarg, -1, GID_MAX(2147483647 *2U +1U), &errstr);
	if (errstr != NULL((void *)0)) {
		errx(EXIT_FAILURE1, "When using [-g gid], the gid must be numeric");
	}
	break;
case 'o':
	dupgid = 1;
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("groupadd");
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupadd");
}

if (pledge("stdio rpath wpath cpath fattr flock getpw", NULL((void *)0)) == -1)
err(1, "pledge");

checkeuid();
if (!valid_group(*argv)) {
errx(EXIT_FAILURE1, "invalid group name `%s'", *argv);
}
if (gid < 0 && !getnextgid(&gid, LowGid, HighGid)) {
errx(EXIT_FAILURE1, "can't add group: can't get next gid");
}
if (!dupgid && gid_exists((gid_t)gid)) {
errx(EXIT_FAILURE1, "can't add group: gid %d is a duplicate", gid);
}
openlog("groupadd", LOG_PID0x01, LOG_USER(1<<3));
if (!creategid(*argv, gid, "")) {
errx(EXIT_FAILURE1, "can't add group: problems with %s file",
    _PATH_GROUP"/etc/group");
}
return EXIT_SUCCESS0;
2161}

2163/* remove a group */
2164int
2165groupdel(int argc, char **argv)
2166{
int	c;

while ((c = getopt(argc, argv, "v")) != -1) {
switch(c) {
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("groupdel");
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupdel");
}
checkeuid();
openlog("groupdel", LOG_PID0x01, LOG_USER(1<<3));
if (!group_exists(*argv)) {
warnx("No such group: `%s'", *argv);
return EXIT_FAILURE1;
}

if (pledge("stdio rpath wpath cpath fattr flock", NULL((void *)0)) == -1)
err(1, "pledge");

if (!modify_gid(*argv, NULL((void *)0))) {
err(EXIT_FAILURE1, "can't change %s file", _PATH_GROUP"/etc/group");
}
return EXIT_SUCCESS0;
2197}

2199/* modify a group */
2200int
2201groupmod(int argc, char **argv)
2202{
struct group	*grp;
const char	*errstr;
char		buf[LINE_MAX2048];
char		*newname;
char		**cpp;
int		dupgid;
int		gid;
int		cc;
int		c;

gid = -1;
dupgid = 0;
newname = NULL((void *)0);
while ((c = getopt(argc, argv, "g:n:ov")) != -1) {
switch(c) {
case 'g':
	gid = strtonum(optarg, -1, GID_MAX(2147483647 *2U +1U), &errstr);
	if (errstr != NULL((void *)0)) {
		errx(EXIT_FAILURE1, "When using [-g gid], the gid must be numeric");
	}
	break;
case 'o':
	dupgid = 1;
	break;
case 'n':
	memsave(&newname, optarg, strlen(optarg));
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("groupmod");
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupmod");
}
checkeuid();
if (gid < 0 && newname == NULL((void *)0)) {
errx(EXIT_FAILURE1, "Nothing to change");
}
if (dupgid && gid < 0) {
errx(EXIT_FAILURE1, "Duplicate which gid?");
}
if ((grp = getgrnam(*argv)) == NULL((void *)0)) {
errx(EXIT_FAILURE1, "can't find group `%s' to modify", *argv);
}

if (pledge("stdio rpath wpath cpath fattr flock", NULL((void *)0)) == -1)
err(1, "pledge");

if (!is_local(*argv, _PATH_GROUP"/etc/group")) {
errx(EXIT_FAILURE1, "Group `%s' must be a local group", *argv);
}
if (newname != NULL((void *)0) && !valid_group(newname)) {
errx(EXIT_FAILURE1, "invalid group name `%s'", newname);
}
if ((cc = snprintf(buf, sizeof(buf), "%s:%s:%u:",
   (newname) ? newname : grp->gr_name, grp->gr_passwd,
   (gid < 0) ? grp->gr_gid : gid)) >= sizeof(buf) || cc < 0)
errx(EXIT_FAILURE1, "group `%s' entry too long", grp->gr_name);

for (cpp = grp->gr_mem ; *cpp ; cpp++) {
cc = strlcat(buf, *cpp, sizeof(buf)) + 1;
if (cc >= sizeof(buf))
	errx(EXIT_FAILURE1, "group `%s' entry too long",
	    grp->gr_name);
if (cpp[1] != NULL((void *)0)) {
	buf[cc - 1] = ',';
	buf[cc] = '\0';
}
}
cc = strlcat(buf, "\n", sizeof(buf));
if (cc >= sizeof(buf))
errx(EXIT_FAILURE1, "group `%s' entry too long", grp->gr_name);

openlog("groupmod", LOG_PID0x01, LOG_USER(1<<3));
if (!modify_gid(*argv, buf))
err(EXIT_FAILURE1, "can't change %s file", _PATH_GROUP"/etc/group");
return EXIT_SUCCESS0;
2285}

2287/* display user information */
2288int
2289userinfo(int argc, char **argv)
2290{
struct passwd	*pwp;
struct group	*grp;
char		**cpp;
int		exists;
int		i;

exists = 0;
while ((i = getopt(argc, argv, "ev")) != -1) {
switch(i) {
case 'e':
	exists = 1;
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("userinfo");
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userinfo");
}

if (pledge("stdio getpw", NULL((void *)0)) == -1)
err(1, "pledge");

pwp = find_user_info(*argv);
if (exists) {
exit((pwp) ? EXIT_SUCCESS0 : EXIT_FAILURE1);
}
if (pwp == NULL((void *)0)) {
errx(EXIT_FAILURE1, "can't find user `%s'", *argv);
}
printf("login\t%s\n", pwp->pw_name);
printf("passwd\t%s\n", pwp->pw_passwd);
printf("uid\t%u\n", pwp->pw_uid);
if ((grp = getgrgid(pwp->pw_gid)) == NULL((void *)0))
printf("groups\t%u", pwp->pw_gid);
else
printf("groups\t%s", grp->gr_name);
while ((grp = getgrent()) != NULL((void *)0)) {
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
	if (strcmp(*cpp, pwp->pw_name) == 0 &&
	    grp->gr_gid != pwp->pw_gid)
		printf(" %s", grp->gr_name);
}
}
fputc('\n', stdout(&__sF[1]));
printf("change\t%s", pwp->pw_change ? ctime(&pwp->pw_change) : "NEVER\n");
printf("class\t%s\n", pwp->pw_class);
printf("gecos\t%s\n", pwp->pw_gecos);
printf("dir\t%s\n", pwp->pw_dir);
printf("shell\t%s\n", pwp->pw_shell);
printf("expire\t%s", pwp->pw_expire ? ctime(&pwp->pw_expire) : "NEVER\n");
return EXIT_SUCCESS0;
2348}

2350/* display user information */
2351int
2352groupinfo(int argc, char **argv)
2353{
struct group	*grp;
char		**cpp;
int		exists;
int		i;

exists = 0;
while ((i = getopt(argc, argv, "ev")) != -1) {
switch(i) {
case 'e':
	exists = 1;
	break;
case 'v':
	verbose = 1;
	break;
default:
	usermgmt_usage("groupinfo");
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupinfo");
}

if (pledge("stdio getpw", NULL((void *)0)) == -1)
err(1, "pledge");

grp = find_group_info(*argv);
if (exists) {
exit((grp) ? EXIT_SUCCESS0 : EXIT_FAILURE1);
}
if (grp == NULL((void *)0)) {
errx(EXIT_FAILURE1, "can't find group `%s'", *argv);
}
printf("name\t%s\n", grp->gr_name);
printf("passwd\t%s\n", grp->gr_passwd);
printf("gid\t%u\n", grp->gr_gid);
printf("members\t");
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
printf("%s ", *cpp);
}
fputc('\n', stdout(&__sF[1]));
return EXIT_SUCCESS0;
2397}