* Copyright (c) 1999 Alistair G. Crooks. All rights reserved.

/* $NetBSD: user.c,v 1.135 2021/12/12 14:33:13 nia Exp $ */

/*
* Copyright (c) 1999 Alistair G. Crooks. All rights reserved.
* Copyright (c) 2005 Liam J. Foy. 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.
*/
#include <sys/cdefs.h>

#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1999\
The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$NetBSD: user.c,v 1.135 2021/12/12 14:33:13 nia Exp $");
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#ifdef EXTENSIONS
#include <login_cap.h>
#endif
#include <pwd.h>
#include <regex.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include <errno.h>

#include "pathnames.h"
#include "defs.h"
#include "usermgmt.h"

/* this struct describes a uid range */
typedef struct range_t {
int r_from; /* low uid */
int r_to; /* high uid */
} range_t;

typedef struct rangelist_t {
unsigned rl_rsize; /* size of range array */
unsigned rl_rc; /* # of ranges */
range_t *rl_rv; /* the ranges */
unsigned rl_defrc; /* # of ranges in defaults */
} rangelist_t;

/* this struct encapsulates the user and group information */
typedef struct user_t {
int u_flags; /* see below */
int u_uid; /* uid of user */
char *u_password; /* encrypted password */
char *u_comment; /* comment field */
char *u_home; /* home directory */
mode_t u_homeperm; /* permissions of home dir */
char *u_primgrp; /* primary group */
int u_groupc; /* # of secondary groups */
const char *u_groupv[NGROUPS_MAX]; /* secondary groups */
char *u_shell; /* user's shell */
char *u_basedir; /* base directory for home */
char *u_expire; /* when password will expire */
char *u_inactive; /* when account will expire */
char *u_skeldir; /* directory for startup files */
char *u_class; /* login class */
rangelist_t u_r; /* list of ranges */
unsigned u_defrc; /* # of ranges in defaults */
int u_preserve; /* preserve uids on deletion */
int u_allow_samba; /* allow trailing '$' for samba login names */
int u_locked; /* user account lock */
} user_t;
#define u_rsize u_r.rl_rsize
#define u_rc u_r.rl_rc
#define u_rv u_r.rl_rv
#define u_defrc u_r.rl_defrc

/* this struct encapsulates the user and group information */
typedef struct group_t {
rangelist_t g_r; /* list of ranges */
} group_t;
#define g_rsize g_r.rl_rsize
#define g_rc g_r.rl_rc
#define g_rv g_r.rl_rv
#define g_defrc g_r.rl_defrc

typedef struct def_t {
user_t user;
group_t group;
} def_t;

/* flags for which fields of the user_t replace the passwd entry */
enum {
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
};

#define UNLOCK 0
#define LOCK 1
#define LOCKED "*LOCKED*"

#ifndef DEF_GROUP
#define DEF_GROUP "users"
#endif

#ifndef DEF_BASEDIR
#define DEF_BASEDIR "/home"
#endif

#ifndef DEF_SKELDIR
#define DEF_SKELDIR "/etc/skel"
#endif

#ifndef DEF_SHELL
#define DEF_SHELL _PATH_BSHELL
#endif

#ifndef DEF_COMMENT
#define DEF_COMMENT ""
#endif

#ifndef DEF_LOWUID
#define DEF_LOWUID 1000
#endif

#ifndef DEF_HIGHUID
#define DEF_HIGHUID 60000
#endif

#ifndef DEF_INACTIVE
#define DEF_INACTIVE 0
#endif

#ifndef DEF_EXPIRE
#define DEF_EXPIRE NULL
#endif

#ifndef DEF_CLASS
#define DEF_CLASS ""
#endif

#ifndef WAITSECS
#define WAITSECS 10
#endif

#ifndef NOBODY_UID
#define NOBODY_UID 32767
#endif

#ifndef DEF_HOMEPERM
#define DEF_HOMEPERM 0755
#endif

/* some useful constants */
enum {
MaxShellNameLen = 256,
MaxFileNameLen = MAXPATHLEN,
MaxUserNameLen = LOGIN_NAME_MAX - 1,
MaxCommandLen = 2048,
MaxEntryLen = 2048,
PasswordLength = 2048,

DES_Len = 13,
};

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

static int asystem(const char *fmt, ...) __printflike(1, 2);
static int is_number(const char *);
static struct group *find_group_info(const char *);
static int verbose;

static char *
skipspace(char *s)
{
for (; *s && isspace((unsigned char)*s) ; s++) {
}
return s;
}

static int
check_numeric(const char *val, const char *name)
{
if (!is_number(val)) {
errx(EXIT_FAILURE, "When using [-%c %s], "
"the %s must be numeric", *name, name, name);
}
return atoi(val);
}

/* resize *cpp appropriately then assign `n' chars of `s' to it */
static void
memsave(char **cpp, const char *s, size_t n)
{
RENEW(char, *cpp, n + 1, exit(1));
(void)memcpy(*cpp, s, n);
(*cpp)[n] = '\0';
}

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

va_start(vp, fmt);
(void)vsnprintf(buf, sizeof(buf), fmt, vp);
va_end(vp);
if (verbose) {
(void)printf("Command: %s\n", buf);
}
ret = system(buf);
if (ret == -1) {
warn("Error running `%s'", buf);
} else if (WIFSIGNALED(ret)) {
warnx("Error running `%s': Signal %d", buf, WTERMSIG(ret));
} else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) {
warnx("Error running `%s': Exit %d", buf, WEXITSTATUS(ret));
}
return ret;
}

/* remove a users home directory, returning 1 for success (ie, no problems encountered) */
static int
removehomedir(struct passwd *pwp)
{
struct stat st;

/* userid not root? */
if (pwp->pw_uid == 0) {
warnx("Not deleting home directory `%s'; userid is 0", pwp->pw_dir);
return 0;
}

/* directory exists (and is a directory!) */
if (stat(pwp->pw_dir, &st) < 0) {
warn("Cannot access home directory `%s'", pwp->pw_dir);
return 0;
}
if (!S_ISDIR(st.st_mode)) {
warnx("Home directory `%s' is not a directory", pwp->pw_dir);
return 0;
}

/* userid matches directory owner? */
if (st.st_uid != pwp->pw_uid) {
warnx("User `%s' doesn't own directory `%s', not removed",
pwp->pw_name, pwp->pw_dir);
return 0;
}

(void)seteuid(pwp->pw_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", _PATH_RM,
pwp->pw_dir);
(void)seteuid(0);
if (rmdir(pwp->pw_dir) < 0 && errno != ENOENT) {
warn("Unable to remove all files in `%s'", pwp->pw_dir);
return 0;
}
return 1;
}

/* return 1 if all of `s' is numeric */
static int
is_number(const char *s)
{
for ( ; *s ; s++) {
if (!isdigit((unsigned char) *s)) {
return 0;
}
}
return 1;
}

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

/* copy any dot files into the user's home directory */
static int
copydotfiles(char *skeldir, int uid, int gid, char *dir, mode_t homeperm)
{
struct dirent *dp;
DIR *dirp;
int n;

if ((dirp = opendir(skeldir)) == NULL) {
warn("Can't open source . files dir `%s'", skeldir);
return 0;
}
for (n = 0; (dp = readdir(dirp)) != NULL && 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, _PATH_PAX, (verbose) ? "-v" : "", dir);
}
(void)asystem("%s -R -h %d:%d %s", _PATH_CHOWN, uid, gid, dir);
(void)asystem("%s -R u+w %s", _PATH_CHMOD, dir);
#ifdef EXTENSIONS
(void)asystem("%s 0%o %s", _PATH_CHMOD, homeperm, dir);
#endif
return n;
}

/* create a group entry with gid `gid' */
static int
creategid(char *group, int gid, const char *name)
{
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
int fd;
int cc;

if (getgrnam(group) != NULL) {
warnx("Can't create group `%s': already exists", group);
return 0;
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("Can't create group `%s': can't open `%s'", name,
_PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("Can't lock `%s'", _PATH_GROUP);
(void)fclose(from);
return 0;
}
(void)fstat(fileno(from), &st);
(void)snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
warn("Can't create group `%s': mkstemp failed", group);
(void)fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
warn("Can't create group `%s': fdopen `%s' failed",
group, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
while ((cc = fread(buf, sizeof(char), sizeof(buf), from)) > 0) {
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
warn("Can't create group `%s': short write to `%s'",
group, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
}
(void)fprintf(to, "%s:*:%d:%s\n", group, gid, name);
(void)fclose(from);
(void)fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
warn("Can't create group `%s': can't rename `%s' to `%s'",
group, f, _PATH_GROUP);
(void)unlink(f);
return 0;
}
(void)chmod(_PATH_GROUP, st.st_mode & 07777);
syslog(LOG_INFO, "New group added: name=%s, gid=%d", group, gid);
return 1;
}

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

if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("Can't modify group `%s': can't open `%s'",
group, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("Can't modify group `%s': can't lock `%s'",
group, _PATH_GROUP);
(void)fclose(from);
return 0;
}
(void)fstat(fileno(from), &st);
(void)snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
warn("Can't modify group `%s': mkstemp failed", group);
(void)fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
warn("Can't modify group `%s': fdopen `%s' failed", group, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
groupc = strlen(group);
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warnx("Badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
if (entc == groupc &&
strncmp(group, buf, (unsigned) entc) == 0) {
if (newent == NULL) {
struct group *grp_rm;
struct passwd *user_pwd;

/*
* Check that the group being removed
* isn't any user's Primary group. Just
* warn if it is. This could cause problems
* if the group GID was reused for a
* different purpose.
*/

grp_rm = find_group_info(group);
while ((user_pwd = getpwent()) != NULL) {
if (user_pwd->pw_gid == grp_rm->gr_gid) {
warnx("Warning: group `%s'(%d)"
" is the primary group of"
" `%s'. Use caution if you"
" later add this GID.",
grp_rm->gr_name,
grp_rm->gr_gid, user_pwd->pw_name);
}
}
endpwent();
continue;
} else {
cc = strlen(newent);
(void)strlcpy(buf, newent, sizeof(buf));
}
}
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
warn("Can't modify group `%s': short write to `%s'",
group, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
}
(void)fclose(from);
(void)fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
warn("Can't modify group `%s': can't rename `%s' to `%s'",
group, f, _PATH_GROUP);
(void)unlink(f);
return 0;
}
(void)chmod(_PATH_GROUP, st.st_mode & 07777);
if (newent == NULL) {
syslog(LOG_INFO, "group deleted: name=%s", group);
} else {
syslog(LOG_INFO, "group information modified: name=%s", group);
}
return 1;
}

/* modify the group entries for all `groups', by adding `user' */
static int
append_group(char *user, int ngroups, const char **groups)
{
struct group *grp;
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
char *colon;
int groupc;
int entc;
int fd;
int nc;
int cc;
int i;
int j;

for (i = 0 ; i < ngroups ; i++) {
if ((grp = getgrnam(groups[i])) == NULL) {
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, "r")) == NULL) {
warn("Can't append group(s) for `%s': can't open `%s'",
user, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("Can't append group(s) for `%s': can't lock `%s'",
user, _PATH_GROUP);
(void)fclose(from);
return 0;
}
(void)fstat(fileno(from), &st);
(void)snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
warn("Can't append group(s) for `%s': mkstemp failed",
user);
(void)fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
warn("Can't append group(s) for `%s': fdopen `%s' failed",
user, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warnx("Badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
for (i = 0 ; i < ngroups ; i++) {
if ((groupc = strlen(groups[i])) == 0) {
continue;
}
if (entc == groupc &&
strncmp(groups[i], buf, (unsigned) entc) == 0) {
if ((nc = snprintf(&buf[cc - 1],
sizeof(buf) - cc + 1, "%s%s\n",
(buf[cc - 2] == ':') ? "" : ",", user)) < 0) {
warnx("Warning: group `%s' "
"entry too long", groups[i]);
}
cc += nc - 1;
}
}
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
warn("Can't append group(s) for `%s':"
" short write to `%s'", user, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
}
(void)fclose(from);
(void)fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
warn("Can't append group(s) for `%s': "
"can't rename `%s' to `%s'", user, f, _PATH_GROUP);
(void)unlink(f);
return 0;
}
(void)chmod(_PATH_GROUP, st.st_mode & 07777);
return 1;
}

/* the valid characters for login and group names */
#define VALID_CHAR(c) (isalnum(c) || (c) == '.' || (c) == '_' || (c) == '-')

/* return 1 if `login' is a valid login name */
static int
valid_login(char *login_name, int allow_samba)
{
unsigned char *cp;

/* First character of a login name cannot be '-'. */
if (*login_name == '-') {
return 0;
}
if (strlen(login_name) >= LOGIN_NAME_MAX) {
return 0;
}
for (cp = (unsigned char *)login_name ; *cp ; cp++) {
if (!VALID_CHAR(*cp)) {
#ifdef EXTENSIONS
/* check for a trailing '$' in a Samba user name */
if (allow_samba && *cp == '$' && *(cp + 1) == 0x0) {
return 1;
}
#endif
return 0;
}
}
return 1;
}

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

for (cp = (unsigned char *)group; *cp; cp++) {
if (!VALID_CHAR(*cp)) {
return 0;
}
}
return 1;
}

/* find the next gid in the range lo .. hi */
static int
getnextgid(int *gidp, int lo, int hi)
{
for (*gidp = lo ; *gidp < hi ; *gidp += 1) {
if (getgrgid((gid_t)*gidp) == NULL) {
return 1;
}
}
return 0;
}

#ifdef EXTENSIONS
/* save a range of uids */
static int
save_range(rangelist_t *rlp, char *cp)
{
int from;
int to;
int i;

if (rlp->rl_rsize == 0) {
rlp->rl_rsize = 32;
NEWARRAY(range_t, rlp->rl_rv, rlp->rl_rsize, return(0));
} else if (rlp->rl_rc == rlp->rl_rsize) {
rlp->rl_rsize *= 2;
RENEW(range_t, rlp->rl_rv, rlp->rl_rsize, return(0));
}
if (rlp->rl_rv && sscanf(cp, "%d..%d", &from, &to) == 2) {
for (i = rlp->rl_defrc ; i < rlp->rl_rc ; i++) {
if (rlp->rl_rv[i].r_from == from &&
rlp->rl_rv[i].r_to == to) {
break;
}
}
if (i == rlp->rl_rc) {
rlp->rl_rv[rlp->rl_rc].r_from = from;
rlp->rl_rv[rlp->rl_rc].r_to = to;
rlp->rl_rc += 1;
}
} else {
warnx("Bad range `%s'", cp);
return 0;
}
return 1;
}
#endif

/* set the defaults in the defaults file */
static int
setdefaults(user_t *up)
{
char template[MaxFileNameLen];
FILE *fp;
int ret;
int fd;
#ifdef EXTENSIONS
int i;
#endif

(void)snprintf(template, sizeof(template), "%s.XXXXXX",
_PATH_USERMGMT_CONF);
if ((fd = mkstemp(template)) < 0) {
warn("Can't set defaults: can't mkstemp `%s' for writing",
_PATH_USERMGMT_CONF);
return 0;
}
if ((fp = fdopen(fd, "w")) == NULL) {
warn("Can't set defaults: can't fdopen `%s' for writing",
_PATH_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 ||
#ifdef EXTENSIONS
fprintf(fp, "class\t\t%s\n", up->u_class) <= 0 ||
fprintf(fp, "homeperm\t0%o\n", up->u_homeperm) <= 0 ||
#endif
fprintf(fp, "inactive\t%s\n", (up->u_inactive == NULL) ?
UNSET_INACTIVE : up->u_inactive) <= 0 ||
fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL) ?
UNSET_EXPIRY : up->u_expire) <= 0 ||
fprintf(fp, "preserve\t%s\n", (up->u_preserve == 0) ?
"false" : "true") <= 0) {
warn("Can't write to `%s'", _PATH_USERMGMT_CONF);
ret = 0;
}
#ifdef EXTENSIONS
for (i = (up->u_defrc != up->u_rc) ? up->u_defrc : 0;
i < up->u_rc ; i++) {
if (fprintf(fp, "range\t\t%d..%d\n", up->u_rv[i].r_from,
up->u_rv[i].r_to) <= 0) {
warn("Can't set defaults: can't write to `%s'",
_PATH_USERMGMT_CONF);
ret = 0;
}
}
#endif
(void)fclose(fp);
if (ret) {
ret = ((rename(template, _PATH_USERMGMT_CONF) == 0) &&
(chmod(_PATH_USERMGMT_CONF, 0644) == 0));
}
return ret;
}

/* read the defaults file */
static void
read_defaults(def_t *dp)
{
struct stat st;
size_t lineno;
size_t len;
FILE *fp;
char *cp;
char *s;
user_t *up = &dp->user;
group_t *gp = &dp->group;

(void)memset(dp, 0, sizeof(*dp));

memsave(&up->u_primgrp, DEF_GROUP, strlen(DEF_GROUP));
memsave(&up->u_basedir, DEF_BASEDIR, strlen(DEF_BASEDIR));
memsave(&up->u_skeldir, DEF_SKELDIR, strlen(DEF_SKELDIR));
memsave(&up->u_shell, DEF_SHELL, strlen(DEF_SHELL));
memsave(&up->u_comment, DEF_COMMENT, strlen(DEF_COMMENT));
#ifdef EXTENSIONS
memsave(&up->u_class, DEF_CLASS, strlen(DEF_CLASS));
#endif
up->u_rsize = 16;
up->u_defrc = 0;
NEWARRAY(range_t, up->u_rv, up->u_rsize, exit(1));
up->u_inactive = DEF_INACTIVE;
up->u_expire = DEF_EXPIRE;
up->u_homeperm = DEF_HOMEPERM;
gp->g_rsize = 16;
gp->g_defrc = 0;
NEWARRAY(range_t, gp->g_rv, gp->g_rsize, exit(1));
if ((fp = fopen(_PATH_USERMGMT_CONF, "r")) == NULL) {
if (stat(_PATH_USERMGMT_CONF, &st) < 0 && !setdefaults(up)) {
warn("Can't create `%s' defaults file",
_PATH_USERMGMT_CONF);
}
fp = fopen(_PATH_USERMGMT_CONF, "r");
}
if (fp != NULL) {
while ((s = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) {
if (strncmp(s, "group", 5) == 0) {
cp = skipspace(s + 5);
memsave(&up->u_primgrp, (char *)cp, strlen(cp));
} else if (strncmp(s, "base_dir", 8) == 0) {
cp = skipspace(s + 8);
memsave(&up->u_basedir, (char *)cp, strlen(cp));
} else if (strncmp(s, "skel_dir", 8) == 0) {
cp = skipspace(s + 8);
memsave(&up->u_skeldir, (char *)cp, strlen(cp));
} else if (strncmp(s, "shell", 5) == 0) {
cp = skipspace(s + 5);
memsave(&up->u_shell, cp, strlen(cp));
#ifdef EXTENSIONS
} else if (strncmp((char *)s, "class", 5) == 0) {
cp = skipspace(s + 5);
memsave(&up->u_class, cp, strlen(cp));
#endif
#ifdef EXTENSIONS
} else if (strncmp(s, "homeperm", 8) == 0) {
for (cp = s + 8; *cp &&
isspace((unsigned char)*cp); cp++)
;
up->u_homeperm = strtoul(cp, NULL, 8);
#endif
} else if (strncmp(s, "inactive", 8) == 0) {
cp = skipspace(s + 8);
if (strcmp(cp, UNSET_INACTIVE) == 0) {
if (up->u_inactive) {
FREE(up->u_inactive);
}
up->u_inactive = NULL;
} else {
memsave(&up->u_inactive, cp, strlen(cp));
}
#ifdef EXTENSIONS
} else if (strncmp(s, "range", 5) == 0) {
cp = skipspace(s + 5);
(void)save_range(&up->u_r, cp);
#endif
#ifdef EXTENSIONS
} else if (strncmp(s, "preserve", 8) == 0) {
cp = skipspace(s + 8);
up->u_preserve =
(strncmp(cp, "true", 4) == 0) ? 1 :
(strncmp(cp, "yes", 3) == 0) ? 1 : atoi(cp);
#endif
} else if (strncmp(s, "expire", 6) == 0) {
cp = skipspace(s + 6);
if (strcmp(cp, UNSET_EXPIRY) == 0) {
if (up->u_expire) {
FREE(up->u_expire);
}
up->u_expire = NULL;
} else {
memsave(&up->u_expire, cp, strlen(cp));
}
#ifdef EXTENSIONS
} else if (strncmp(s, "gid_range", 9) == 0) {
cp = skipspace(s + 9);
(void)save_range(&gp->g_r, cp);
#endif
}
(void)free(s);
}
(void)fclose(fp);
}
if (up->u_rc == 0) {
up->u_rv[up->u_rc].r_from = DEF_LOWUID;
up->u_rv[up->u_rc].r_to = DEF_HIGHUID;
up->u_rc += 1;
}
up->u_defrc = up->u_rc;
}

/* return the next valid unused uid */
static int
getnextuid(int sync_uid_gid, int *uid, int low_uid, int high_uid)
{
for (*uid = low_uid ; *uid <= high_uid ; (*uid)++) {
if (getpwuid((uid_t)(*uid)) == NULL && *uid != NOBODY_UID) {
if (sync_uid_gid) {
if (getgrgid((gid_t)(*uid)) == NULL) {
return 1;
}
} else {
return 1;
}
}
}
return 0;
}

/* structure which defines a password type */
typedef struct passwd_type_t {
const char *type; /* optional type descriptor */
size_t desc_length; /* length of type descriptor */
size_t length; /* length of password */
const char *regex; /* regexp to output the password */
size_t re_sub; /* subscript of regexp to use */
} passwd_type_t;

static passwd_type_t passwd_types[] = {
{ "$argon2i", 8, SIZE_MAX, "\\$[^$]+\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* Argon2i */
{ "$argon2id", 9, SIZE_MAX, "\\$[^$]+\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* Argon2id */
{ "$argon2d", 8, SIZE_MAX, "\\$[^$]+\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* Argon2d */
{ "$sha1", 5, 28, "\\$[^$]+\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* SHA1 */
{ "$2a", 3, 53, "\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* Blowfish */
{ "$1", 2, 34, NULL, 0 }, /* MD5 */
{ "", 0, DES_Len,NULL, 0 }, /* standard DES */
{ NULL, (size_t)~0, (size_t)~0, NULL, 0 }
/* none - terminate search */
};

/* return non-zero if it's a valid password - check length for cipher type */
static int
valid_password_length(char *newpasswd)
{
passwd_type_t *pwtp;
regmatch_t matchv[10];
regex_t r;

for (pwtp = passwd_types; pwtp->desc_length != (size_t)~0; pwtp++) {
if (strncmp(newpasswd, pwtp->type, pwtp->desc_length) == 0) {
if (pwtp->regex == NULL) {
return pwtp->length == SIZE_MAX ||
strlen(newpasswd) == pwtp->length;
}
(void)regcomp(&r, pwtp->regex, REG_EXTENDED);
if (regexec(&r, newpasswd, 10, matchv, 0) == 0) {
regfree(&r);
return pwtp->length == SIZE_MAX ||
(int)(matchv[pwtp->re_sub].rm_eo -
matchv[pwtp->re_sub].rm_so) ==
pwtp->length;
}
regfree(&r);
}
}
return 0;
}

#ifdef EXTENSIONS
/* return 1 if `class' is a valid login class */
static int
valid_class(char *class)
{
login_cap_t *lc;

if (class == NULL || *class == '\0') {
return 1;
}
/*
* Check if /etc/login.conf exists. login_getclass() will
* return 1 due to it not existing, so not informing the
* user the actual login class does not exist.
*/

if (access(_PATH_LOGINCONF, R_OK) == -1) {
warn("Access failed for `%s'; will not validate class `%s'",
_PATH_LOGINCONF, class);
return 1;
}

if ((lc = login_getclass(class)) != NULL) {
login_close(lc);
return 1;
}
return 0;
}

/* return 1 if the `shellname' is a valid user shell */
static int
valid_shell(const char *shellname)
{
char *shellp;

if (access(_PATH_SHELLS, R_OK) == -1) {
/* Don't exit */
warn("Access failed for `%s'; will not validate shell `%s'",
_PATH_SHELLS, shellname);
return 1;
}

/* if nologin is used as a shell, consider it a valid shell */
if (strcmp(shellname, _PATH_SBIN_NOLOGIN) == 0)
return 1;

while ((shellp = getusershell()) != NULL)
if (strcmp(shellp, shellname) == 0)
return 1;

warnx("Shell `%s' not found in `%s'", shellname, _PATH_SHELLS);

return access(shellname, X_OK) != -1;
}
#endif

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

*tp = 0;
if (s != NULL) {
(void)memset(&tm, 0, sizeof(tm));
if (strptime(s, "%c", &tm) != NULL) {
*tp = mktime(&tm);
return (*tp == -1) ? 0 : 1;
} else if (strptime(s, "%B %d %Y", &tm) != NULL) {
*tp = mktime(&tm);
return (*tp == -1) ? 0 : 1;
} else {
errno = 0;
*tp = val = strtol(s, &ep, 10);
if (*ep != '\0' || *tp < -1 || errno == ERANGE) {
*tp = 0;
return 0;
}
if (*tp != val) {
return 0;
}
}
}
return 1;
}

/* add a user */
static int
adduser(char *login_name, user_t *up)
{
struct group *grp;
struct stat st;
time_t expire;
time_t inactive;
char password[PasswordLength + 1];
char home[MaxFileNameLen];
char buf[MaxFileNameLen];
int sync_uid_gid;
int masterfd;
int ptmpfd;
int gid;
int cc;
int i;

if (!valid_login(login_name, up->u_allow_samba)) {
errx(EXIT_FAILURE, "Can't add user `%s': invalid login name", login_name);
}
#ifdef EXTENSIONS
if (!valid_class(up->u_class)) {
errx(EXIT_FAILURE, "Can't add user `%s': no such login class `%s'",
login_name, up->u_class);
}
#endif
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "Can't add user `%s': can't open `%s'",
login_name, _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "Can't add user `%s': can't lock `%s'",
login_name, _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
int serrno = errno;
(void)close(masterfd);
errno = serrno;
err(EXIT_FAILURE, "Can't add user `%s': can't obtain pw_lock",
login_name);
}
while ((cc = read(masterfd, buf, sizeof(buf))) > 0) {
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
int serrno = errno;
(void)close(masterfd);
(void)close(ptmpfd);
(void)pw_abort();
errno = serrno;
err(EXIT_FAILURE, "Can't add user `%s': "
"short write to /etc/ptmp", login_name);
}
}
(void)close(masterfd);
/* 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 && 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).
*/
for (i = 0; !got_id && 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) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': "
"can't get next uid for %d", login_name,
up->u_uid);
}
}
/* check uid isn't already allocated */
if (!(up->u_flags & F_DUPUID) && getpwuid((uid_t)(up->u_uid)) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': "
"uid %d is already in use", login_name, up->u_uid);
}
/* if -g=uid was specified, check gid is unused */
if (sync_uid_gid) {
if (getgrgid((gid_t)(up->u_uid)) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': "
"gid %d is already in use", login_name,
up->u_uid);
}
gid = up->u_uid;
} else if ((grp = getgrnam(up->u_primgrp)) != NULL) {
gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid((gid_t)atoi(up->u_primgrp))) != NULL) {
gid = grp->gr_gid;
} else {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': group %s not found",
login_name, up->u_primgrp);
}
/* check name isn't already in use */
if (!(up->u_flags & F_DUPUID) && getpwnam(login_name) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': "
"`%s' is already a user", login_name, login_name);
}
if (up->u_flags & F_HOMEDIR) {
(void)strlcpy(home, up->u_home, sizeof(home));
} else {
/* if home directory hasn't been given, make it up */
(void)snprintf(home, sizeof(home), "%s/%s", up->u_basedir,
login_name);
}
if (up->u_flags & F_SHELL) {
#ifdef EXTENSIONS
if (!valid_shell(up->u_shell)) {
int oerrno = errno;
(void)close(ptmpfd);
(void)pw_abort();
errno = oerrno;
errx(EXIT_FAILURE, "Can't add user `%s': "
"Cannot access shell `%s'",
login_name, up->u_shell);
}
#endif
}

if (!scantime(&inactive, up->u_inactive)) {
warnx("Warning: inactive time `%s' invalid, password expiry off",
up->u_inactive);
}
if (!scantime(&expire, up->u_expire) || expire == -1) {
warnx("Warning: expire time `%s' invalid, account expiry off",
up->u_expire);
expire = 0; /* Just in case. */
}
if (lstat(home, &st) < 0 && !(up->u_flags & F_MKDIR)) {
warnx("Warning: home directory `%s' doesn't exist, "
"and -m was not specified", home);
}
password[sizeof(password) - 1] = '\0';
if (up->u_password != NULL && valid_password_length(up->u_password)) {
(void)strlcpy(password, up->u_password, sizeof(password));
} else {
(void)memset(password, '*', DES_Len);
password[DES_Len] = 0;
if (up->u_password != NULL) {
warnx("Password `%s' is invalid: setting it to `%s'",
up->u_password, password);
}
}
cc = snprintf(buf, sizeof(buf), "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
login_name,
password,
up->u_uid,
gid,
#ifdef EXTENSIONS
up->u_class,
#else
"",
#endif
(long) inactive,
(long) expire,
up->u_comment,
home,
up->u_shell);
if (write(ptmpfd, buf, (size_t) cc) != cc) {
int serrno = errno;
(void)close(ptmpfd);
(void)pw_abort();
errno = serrno;
err(EXIT_FAILURE, "Can't add user `%s': write failed",
login_name);
}
if (up->u_flags & F_MKDIR) {
if (lstat(home, &st) == 0) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE,
"Can't add user `%s': home directory `%s' "
"already exists", login_name, home);
} else {
if (asystem("%s -p %s", _PATH_MKDIR, home) != 0) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': "
"can't mkdir `%s'", login_name, home);
}
(void)copydotfiles(up->u_skeldir, up->u_uid, gid, home,
up->u_homeperm);
}
}
if (strcmp(up->u_primgrp, "=uid") == 0 &&
getgrnam(login_name) == NULL &&
!creategid(login_name, gid, login_name)) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': can't create gid %d ",
login_name, gid);
}
if (up->u_groupc > 0 &&
!append_group(login_name, up->u_groupc, up->u_groupv)) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': can't append "
"to new groups", login_name);
}
(void)close(ptmpfd);
#if PW_MKDB_ARGC == 2
if (pw_mkdb(login_name, 0) < 0)
#else
if (pw_mkdb() < 0)
#endif
{
(void)pw_abort();
errx(EXIT_FAILURE, "Can't add user `%s': pw_mkdb failed",
login_name);
}
syslog(LOG_INFO, "New user added: name=%s, uid=%d, gid=%d, home=%s, "
"shell=%s", login_name, up->u_uid, gid, home, up->u_shell);
return 1;
}

/* remove a user from the groups file */
static int
rm_user_from_groups(char *login_name)
{
struct stat st;
regmatch_t matchv[10];
regex_t r;
FILE *from;
FILE *to;
char line[MaxEntryLen];
char buf[MaxEntryLen];
char f[MaxFileNameLen];
int fd;
int cc;
int sc;

(void)snprintf(line, sizeof(line), "(:|,)(%s)(,|$)", login_name);
if ((sc = regcomp(&r, line, REG_EXTENDED|REG_NEWLINE)) != 0) {
(void)regerror(sc, &r, buf, sizeof(buf));
warnx("Can't compile regular expression `%s' (%s)", line,
buf);
return 0;
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("Can't remove user `%s' from `%s': can't open `%s'",
login_name, _PATH_GROUP, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("Can't remove user `%s' from `%s': can't lock `%s'",
login_name, _PATH_GROUP, _PATH_GROUP);
(void)fclose(from);
return 0;
}
(void)fstat(fileno(from), &st);
(void)snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
warn("Can't remove user `%s' from `%s': mkstemp failed",
login_name, _PATH_GROUP);
(void)fclose(from);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
warn("Can't remove user `%s' from `%s': fdopen `%s' failed",
login_name, _PATH_GROUP, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if (regexec(&r, buf, 10, matchv, 0) == 0) {
if (buf[(int)matchv[1].rm_so] == ',') {
matchv[2].rm_so = matchv[1].rm_so;
} else if (matchv[2].rm_eo != matchv[3].rm_eo) {
matchv[2].rm_eo = matchv[3].rm_eo;
}
cc -= (int) matchv[2].rm_eo;
sc = (int) matchv[2].rm_so;
if (fwrite(buf, sizeof(char), (size_t)sc, to) != sc ||
fwrite(&buf[(int)matchv[2].rm_eo], sizeof(char),
(size_t)cc, to) != cc) {
warn("Can't remove user `%s' from `%s': "
"short write to `%s'", login_name,
_PATH_GROUP, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
} else if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
warn("Can't remove user `%s' from `%s': "
"short write to `%s'", login_name, _PATH_GROUP, f);
(void)fclose(from);
(void)close(fd);
(void)unlink(f);
return 0;
}
}
(void)fclose(from);
(void)fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
warn("Can't remove user `%s' from `%s': "
"can't rename `%s' to `%s'",
login_name, _PATH_GROUP, f, _PATH_GROUP);
(void)unlink(f);
return 0;
}
(void)chmod(_PATH_GROUP, st.st_mode & 07777);
return 1;
}

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

if ((fp = fopen(file, "r")) == NULL) {
err(EXIT_FAILURE, "Can't open `%s'", file);
}
len = strlen(name);
for (ret = 0 ; fgets(buf, sizeof(buf), fp) != NULL ; ) {
if (strncmp(buf, name, len) == 0 && buf[len] == ':') {
ret = 1;
break;
}
}
(void)fclose(fp);
return ret;
}

/* modify a user */
static int
moduser(char *login_name, char *newlogin, user_t *up, int allow_samba)
{
struct passwd *pwp, pw;
struct group *grp;
const char *homedir;
char *locked_pwd;
size_t colonc;
size_t loginc;
size_t len;
FILE *master;
char newdir[MaxFileNameLen];
char buf[MaxEntryLen];
char pwbuf[MaxEntryLen];
char *colon;
int masterfd;
int ptmpfd;
int error;

if (!valid_login(newlogin, allow_samba)) {
errx(EXIT_FAILURE, "Can't modify user `%s': invalid login name",
login_name);
}
if (getpwnam_r(login_name, &pw, pwbuf, sizeof(pwbuf), &pwp) != 0
|| pwp == NULL) {
errx(EXIT_FAILURE, "Can't modify user `%s': no such user",
login_name);
}
if (!is_local(login_name, _PATH_MASTERPASSWD)) {
errx(EXIT_FAILURE, "Can't modify user `%s': must be a local user",
login_name);
}
/* keep dir name in case we need it for '-m' */
homedir = pwp->pw_dir;

if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "Can't modify user `%s': can't open `%s'",
login_name, _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "Can't modify user `%s': can't lock `%s'",
login_name, _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
int serrno = errno;
(void)close(masterfd);
errno = serrno;
err(EXIT_FAILURE, "Can't modify user `%s': "
"can't obtain pw_lock", login_name);
}
if ((master = fdopen(masterfd, "r")) == NULL) {
int serrno = errno;
(void)close(masterfd);
(void)close(ptmpfd);
(void)pw_abort();
errno = serrno;
err(EXIT_FAILURE, "Can't modify user `%s': "
"fdopen fd for %s", login_name, _PATH_MASTERPASSWD);
}
if (up != NULL) {
if (up->u_flags & F_USERNAME) {
/*
* If changing name,
* check new name isn't already in use
*/
if (strcmp(login_name, newlogin) != 0 &&
getpwnam(newlogin) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"`%s' is already a user", login_name,
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) {
if (!valid_password_length(up->u_password)) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE,
"Can't modify user `%s': "
"invalid password: `%s'",
login_name, up->u_password);
}
if ((locked_pwd =
strstr(pwp->pw_passwd, LOCKED)) != NULL) {
/*
* account is locked - keep it locked
* and just change the password.
*/
if (asprintf(&locked_pwd, "%s%s",
LOCKED, up->u_password) == -1) {
(void)close(ptmpfd);
(void)pw_abort();
err(EXIT_FAILURE,
"Can't modify user `%s': "
"asprintf failed",
login_name);
}
pwp->pw_passwd = locked_pwd;
} else {
pwp->pw_passwd = up->u_password;
}
}
}

/* check whether we should lock the account. */
if (up->u_locked == LOCK) {
/* check to see account if already locked. */
if ((locked_pwd = strstr(pwp->pw_passwd, LOCKED))
!= NULL) {
warnx("Account is already locked");
} else {
if (asprintf(&locked_pwd, "%s%s", LOCKED,
pwp->pw_passwd) == -1) {
(void)close(ptmpfd);
(void)pw_abort();
err(EXIT_FAILURE,
"Can't modify user `%s': "
"asprintf failed", login_name);
}
pwp->pw_passwd = locked_pwd;
}
} else if (up->u_locked == UNLOCK) {
if ((locked_pwd = strstr(pwp->pw_passwd, LOCKED))
== NULL) {
warnx("Can't modify user `%s': "
"account is not locked", login_name);
} else {
pwp->pw_passwd = locked_pwd + strlen(LOCKED);
}
}

if (up->u_flags & F_UID) {
/* check uid isn't already allocated */
if (!(up->u_flags & F_DUPUID) &&
getpwuid((uid_t)(up->u_uid)) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"uid `%d' is already in use", login_name,
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 (getgrgid((gid_t)(pwp->pw_uid)) != NULL) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE,
"Can't modify user `%s': "
"gid %d is already in use",
login_name, pwp->pw_uid);
}
pwp->pw_gid = pwp->pw_uid;
if (!creategid(newlogin, pwp->pw_uid, "")) {
errx(EXIT_FAILURE,
"Could not create group %s "
"with uid %d", newlogin,
up->u_uid);
}
} else if ((grp = getgrnam(up->u_primgrp)) != NULL) {
pwp->pw_gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid(
(gid_t)atoi(up->u_primgrp))) != NULL) {
pwp->pw_gid = grp->gr_gid;
} else {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"group %s not found", login_name,
up->u_primgrp);
}
}
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) ||
pwp->pw_expire == -1) {
warnx("Warning: expire time `%s' invalid, "
"account expiry off",
up->u_expire);
pwp->pw_expire = 0;
}
}
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) {
#ifdef EXTENSIONS
if (!valid_shell(up->u_shell)) {
int oerrno = errno;
(void)close(ptmpfd);
(void)pw_abort();
errno = oerrno;
errx(EXIT_FAILURE, "Can't modify user `%s': "
"Cannot access shell `%s'",
login_name, up->u_shell);
}
pwp->pw_shell = up->u_shell;
#else
pwp->pw_shell = up->u_shell;
#endif
}
#ifdef EXTENSIONS
if (up->u_flags & F_CLASS) {
if (!valid_class(up->u_class)) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"no such login class `%s'", login_name,
up->u_class);
}
pwp->pw_class = up->u_class;
}
#endif
}
loginc = strlen(login_name);
while (fgets(buf, sizeof(buf), master) != NULL) {
if ((colon = strchr(buf, ':')) == NULL) {
warnx("Malformed entry `%s'. Skipping", buf);
continue;
}
colonc = (size_t)(colon - buf);
if (strncmp(login_name, buf, loginc) == 0 && loginc == colonc) {
if (up != NULL) {
len = snprintf(buf, sizeof(buf), "%s:%s:%d:%d:"
#ifdef EXTENSIONS
"%s"
#endif
":%ld:%ld:%s:%s:%s\n",
newlogin,
pwp->pw_passwd,
pwp->pw_uid,
pwp->pw_gid,
#ifdef EXTENSIONS
pwp->pw_class,
#endif
(long)pwp->pw_change,
(long)pwp->pw_expire,
pwp->pw_gecos,
pwp->pw_dir,
pwp->pw_shell);
if (write(ptmpfd, buf, len) != len) {
int serrno = errno;
(void)close(ptmpfd);
(void)pw_abort();
errno = serrno;
err(EXIT_FAILURE, "Can't modify user "
"`%s': write", login_name);
}
}
} else {
len = strlen(buf);
if (write(ptmpfd, buf, len) != len) {
int serrno = errno;
(void)close(masterfd);
(void)close(ptmpfd);
(void)pw_abort();
errno = serrno;
err(EXIT_FAILURE, "Can't modify `%s': "
"write", login_name);
}
}
}
if (up != NULL) {
if ((up->u_flags & F_MKDIR) &&
asystem("%s %s %s", _PATH_MV, homedir, pwp->pw_dir) != 0) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"can't move `%s' to `%s'",
login_name, homedir, pwp->pw_dir);
}
if (up->u_groupc > 0 &&
!append_group(newlogin, up->u_groupc, up->u_groupv)) {
(void)close(ptmpfd);
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': "
"can't append `%s' to new groups",
login_name, newlogin);
}
}
(void)close(ptmpfd);
(void)fclose(master);
#if PW_MKDB_ARGC == 2
if (up != NULL && strcmp(login_name, newlogin) == 0) {
error = pw_mkdb(login_name, 0);
} else {
error = pw_mkdb(NULL, 0);
}
#else
error = pw_mkdb();
#endif
if (error < 0) {
(void)pw_abort();
errx(EXIT_FAILURE, "Can't modify user `%s': pw_mkdb failed",
login_name);
}
if (up == NULL) {
syslog(LOG_INFO, "User removed: name=%s", login_name);
} else if (strcmp(login_name, newlogin) == 0) {
syslog(LOG_INFO, "User information modified: name=%s, uid=%d, "
"gid=%d, home=%s, shell=%s",
login_name, pwp->pw_uid, pwp->pw_gid, pwp->pw_dir,
pwp->pw_shell);
} else {
syslog(LOG_INFO, "User information modified: name=%s, "
"new name=%s, uid=%d, gid=%d, home=%s, shell=%s",
login_name, newlogin, pwp->pw_uid, pwp->pw_gid,
pwp->pw_dir, pwp->pw_shell);
}
return 1;
}

#ifdef EXTENSIONS
/* see if we can find out the user struct */
static struct passwd *
find_user_info(const char *name)
{
struct passwd *pwp;

if ((pwp = getpwnam(name)) != NULL) {
return pwp;
}
if (is_number(name) && (pwp = getpwuid((uid_t)atoi(name))) != NULL) {
return pwp;
}
return NULL;
}
#endif

/* see if we can find out the group struct */
static struct group *
find_group_info(const char *name)
{
struct group *grp;

if ((grp = getgrnam(name)) != NULL) {
return grp;
}
if (is_number(name) && (grp = getgrgid((gid_t)atoi(name))) != NULL) {
return grp;
}
return NULL;
}

/* print out usage message, and then exit */
void
usermgmt_usage(const char *prog)
{
if (strcmp(prog, "useradd") == 0) {
(void)fprintf(stderr, "usage: %s -D [-F] [-b base-dir] "
"[-e expiry-time] [-f inactive-time]\n"
"\t[-g gid | name | =uid] [-k skel-dir] [-L login-class]\n"
"\t[-M homeperm] [-r lowuid..highuid] [-s shell]\n", prog);
(void)fprintf(stderr, "usage: %s [-moSv] [-b base-dir] "
"[-c comment] [-d home-dir] [-e expiry-time]\n"
"\t[-f inactive-time] [-G secondary-group] "
"[-g gid | name | =uid]\n"
"\t[-k skeletondir] [-L login-class] [-M homeperm] "
"[-p password]\n"
"\t[-r lowuid..highuid] [-s shell] [-u uid] user\n",
prog);
} else if (strcmp(prog, "usermod") == 0) {
(void)fprintf(stderr, "usage: %s [-FmoSv] [-C yes/no] "
"[-c comment] [-d home-dir] [-e expiry-time]\n"
"\t[-f inactive] [-G secondary-group] "
"[-g gid | name | =uid]\n"
"\t[-L login-class] [-l new-login] [-p password] "
"[-s shell] [-u uid]\n"
"\tuser\n", prog);
} else if (strcmp(prog, "userdel") == 0) {
(void)fprintf(stderr, "usage: %s -D [-p preserve-value]\n", prog);
(void)fprintf(stderr,
"usage: %s [-rSv] [-p preserve-value] user\n", prog);
#ifdef EXTENSIONS
} else if (strcmp(prog, "userinfo") == 0) {
(void)fprintf(stderr, "usage: %s [-e] user\n", prog);
#endif
} else if (strcmp(prog, "groupadd") == 0) {
(void)fprintf(stderr, "usage: %s [-ov] [-g gid]"
" [-r lowgid..highgid] group\n", prog);
} else if (strcmp(prog, "groupdel") == 0) {
(void)fprintf(stderr, "usage: %s [-v] group\n", prog);
} else if (strcmp(prog, "groupmod") == 0) {
(void)fprintf(stderr,
"usage: %s [-ov] [-g gid] [-n newname] group\n", prog);
} else if (strcmp(prog, "user") == 0 || strcmp(prog, "group") == 0) {
(void)fprintf(stderr,
"usage: %s ( add | del | mod | info ) ...\n", prog);
#ifdef EXTENSIONS
} else if (strcmp(prog, "groupinfo") == 0) {
(void)fprintf(stderr, "usage: %s [-ev] group\n", prog);
#endif
}
exit(EXIT_FAILURE);
/* NOTREACHED */
}

#ifdef EXTENSIONS
#define ADD_OPT_EXTENSIONS "M:p:r:vL:S"
#else
#define ADD_OPT_EXTENSIONS
#endif

int
useradd(int argc, char **argv)
{
def_t def;
user_t *up = &def.user;
int defaultfield;
int bigD;
int c;
#ifdef EXTENSIONS
int i;
#endif

read_defaults(&def);
up->u_uid = -1;
defaultfield = bigD = 0;
while ((c = getopt(argc, argv, "DFG:b:c:d:e:f:g:k:mou:s:"
ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'D':
bigD = 1;
break;
case 'F':
/*
* Setting -1 will force the new user to
* change their password as soon as they
* next log in - passwd(5).
*/
defaultfield = 1;
memsave(&up->u_inactive, "-1", strlen("-1"));
break;
case 'G':
while (up->u_groupc < NGROUPS_MAX &&
(up->u_groupv[up->u_groupc] = strsep(&optarg, ",")) != NULL) {
if (up->u_groupv[up->u_groupc][0] != 0) {
up->u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups "
"to %d entries", NGROUPS_MAX);
}
break;
#ifdef EXTENSIONS
case 'S':
up->u_allow_samba = 1;
break;
#endif
case 'b':
defaultfield = 1;
memsave(&up->u_basedir, optarg, strlen(optarg));
break;
case 'c':
memsave(&up->u_comment, optarg, strlen(optarg));
break;
case 'd':
memsave(&up->u_home, optarg, strlen(optarg));
up->u_flags |= F_HOMEDIR;
break;
case 'e':
defaultfield = 1;
memsave(&up->u_expire, optarg, strlen(optarg));
break;
case 'f':
defaultfield = 1;
memsave(&up->u_inactive, optarg, strlen(optarg));
break;
case 'g':
defaultfield = 1;
memsave(&up->u_primgrp, optarg, strlen(optarg));
break;
case 'k':
defaultfield = 1;
memsave(&up->u_skeldir, optarg, strlen(optarg));
break;
#ifdef EXTENSIONS
case 'L':
defaultfield = 1;
memsave(&up->u_class, optarg, strlen(optarg));
break;
#endif
case 'm':
up->u_flags |= F_MKDIR;
break;
#ifdef EXTENSIONS
case 'M':
defaultfield = 1;
up->u_homeperm = strtoul(optarg, NULL, 8);
break;
#endif
case 'o':
up->u_flags |= F_DUPUID;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&up->u_password, optarg, strlen(optarg));
break;
#endif
#ifdef EXTENSIONS
case 'r':
defaultfield = 1;
(void)save_range(&up->u_r, optarg);
break;
#endif
case 's':
up->u_flags |= F_SHELL;
defaultfield = 1;
memsave(&up->u_shell, optarg, strlen(optarg));
break;
case 'u':
up->u_uid = check_numeric(optarg, "uid");
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("useradd");
/* NOTREACHED */
}
}
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(up) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void)printf("group\t\t%s\n", up->u_primgrp);
(void)printf("base_dir\t%s\n", up->u_basedir);
(void)printf("skel_dir\t%s\n", up->u_skeldir);
(void)printf("shell\t\t%s\n", up->u_shell);
#ifdef EXTENSIONS
(void)printf("class\t\t%s\n", up->u_class);
(void)printf("homeperm\t0%o\n", up->u_homeperm);
#endif
(void)printf("inactive\t%s\n", (up->u_inactive == NULL) ?
UNSET_INACTIVE : up->u_inactive);
(void)printf("expire\t\t%s\n", (up->u_expire == NULL) ?
UNSET_EXPIRY : up->u_expire);
#ifdef EXTENSIONS
for (i = 0 ; i < up->u_rc ; i++) {
(void)printf("range\t\t%d..%d\n",
up->u_rv[i].r_from, up->u_rv[i].r_to);
}
#endif
return EXIT_SUCCESS;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("useradd");
}
checkeuid();
openlog("useradd", LOG_PID, LOG_USER);
return adduser(*argv, up) ? EXIT_SUCCESS : EXIT_FAILURE;
}

#ifdef EXTENSIONS
#define MOD_OPT_EXTENSIONS "p:vL:S"
#else
#define MOD_OPT_EXTENSIONS
#endif

int
usermod(int argc, char **argv)
{
def_t def;
user_t *up = &def.user;
char newuser[MaxUserNameLen + 1];
int c, have_new_user;

(void)memset(newuser, 0, sizeof(newuser));
read_defaults(&def);
have_new_user = 0;
up->u_locked = -1;
while ((c = getopt(argc, argv, "C:FG:c:d:e:f:g:l:mos:u:"
MOD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'G':
while (up->u_groupc < NGROUPS_MAX &&
(up->u_groupv[up->u_groupc] =
strsep(&optarg, ",")) != NULL) {
if (up->u_groupv[up->u_groupc][0] != 0) {
up->u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups "
"to %d entries", NGROUPS_MAX);
}
up->u_flags |= F_SECGROUP;
break;
#ifdef EXTENSIONS
case 'S':
up->u_allow_samba = 1;
break;
#endif
case 'c':
memsave(&up->u_comment, optarg, strlen(optarg));
up->u_flags |= F_COMMENT;
break;
case 'C':
if (strcasecmp(optarg, "yes") == 0) {
up->u_locked = LOCK;
} else if (strcasecmp(optarg, "no") == 0) {
up->u_locked = UNLOCK;
} else {
/* No idea. */
errx(EXIT_FAILURE,
"Please type 'yes' or 'no'");
}
break;
case 'F':
memsave(&up->u_inactive, "-1", strlen("-1"));
up->u_flags |= F_INACTIVE;
break;
case 'd':
memsave(&up->u_home, optarg, strlen(optarg));
up->u_flags |= F_HOMEDIR;
break;
case 'e':
memsave(&up->u_expire, optarg, strlen(optarg));
up->u_flags |= F_EXPIRE;
break;
case 'f':
memsave(&up->u_inactive, optarg, strlen(optarg));
up->u_flags |= F_INACTIVE;
break;
case 'g':
memsave(&up->u_primgrp, optarg, strlen(optarg));
up->u_flags |= F_GROUP;
break;
case 'l':
(void)strlcpy(newuser, optarg, sizeof(newuser));
have_new_user = 1;
up->u_flags |= F_USERNAME;
break;
#ifdef EXTENSIONS
case 'L':
memsave(&up->u_class, optarg, strlen(optarg));
up->u_flags |= F_CLASS;
break;
#endif
case 'm':
up->u_flags |= F_MKDIR;
break;
case 'o':
up->u_flags |= F_DUPUID;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&up->u_password, optarg, strlen(optarg));
up->u_flags |= F_PASSWORD;
break;
#endif
case 's':
memsave(&up->u_shell, optarg, strlen(optarg));
up->u_flags |= F_SHELL;
break;
case 'u':
up->u_uid = check_numeric(optarg, "uid");
up->u_flags |= F_UID;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("usermod");
/* NOTREACHED */
}
}
if ((up->u_flags & F_MKDIR) && !(up->u_flags & F_HOMEDIR) &&
!(up->u_flags & F_USERNAME)) {
warnx("Option 'm' useless without 'd' or 'l' -- ignored");
up->u_flags &= ~F_MKDIR;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("usermod");
}
checkeuid();
openlog("usermod", LOG_PID, LOG_USER);
return moduser(*argv, (have_new_user) ? newuser : *argv, up,
up->u_allow_samba) ? EXIT_SUCCESS : EXIT_FAILURE;
}

#ifdef EXTENSIONS
#define DEL_OPT_EXTENSIONS "Dp:vS"
#else
#define DEL_OPT_EXTENSIONS
#endif

int
userdel(int argc, char **argv)
{
struct passwd *pwp;
def_t def;
user_t *up = &def.user;
char password[PasswordLength + 1];
int defaultfield;
int rmhome;
int bigD;
int c;

read_defaults(&def);
defaultfield = bigD = rmhome = 0;
while ((c = getopt(argc, argv, "r" DEL_OPT_EXTENSIONS)) != -1) {
switch(c) {
#ifdef EXTENSIONS
case 'D':
bigD = 1;
break;
#endif
#ifdef EXTENSIONS
case 'S':
up->u_allow_samba = 1;
break;
#endif
#ifdef EXTENSIONS
case 'p':
defaultfield = 1;
up->u_preserve = (strcmp(optarg, "true") == 0) ? 1 :
(strcmp(optarg, "yes") == 0) ? 1 :
atoi(optarg);
break;
#endif
case 'r':
rmhome = 1;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("userdel");
/* NOTREACHED */
}
}
#ifdef EXTENSIONS
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(up) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void)printf("preserve\t%s\n", (up->u_preserve) ? "true" :
"false");
return EXIT_SUCCESS;
}
#endif
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userdel");
}
checkeuid();
if ((pwp = getpwnam(*argv)) == NULL) {
warnx("No such user `%s'", *argv);
return EXIT_FAILURE;
}
if (rmhome) {
(void)removehomedir(pwp);
}
if (up->u_preserve) {
up->u_flags |= F_SHELL;
memsave(&up->u_shell, _PATH_SBIN_NOLOGIN,
strlen(_PATH_SBIN_NOLOGIN));
(void)memset(password, '*', DES_Len);
password[DES_Len] = 0;
memsave(&up->u_password, password, strlen(password));
up->u_flags |= F_PASSWORD;
openlog("userdel", LOG_PID, LOG_USER);
return moduser(*argv, *argv, up, up->u_allow_samba) ?
EXIT_SUCCESS : EXIT_FAILURE;
}
if (!rm_user_from_groups(*argv)) {
return 0;
}
openlog("userdel", LOG_PID, LOG_USER);
return moduser(*argv, *argv, NULL, up->u_allow_samba) ?
EXIT_SUCCESS : EXIT_FAILURE;
}

#ifdef EXTENSIONS
#define GROUP_ADD_OPT_EXTENSIONS "r:v"
#else
#define GROUP_ADD_OPT_EXTENSIONS
#endif

/* add a group */
int
groupadd(int argc, char **argv)
{
def_t def;
group_t *gp = &def.group;
int dupgid;
int gid;
int c;

gid = -1;
dupgid = 0;
read_defaults(&def);
while ((c = getopt(argc, argv, "g:o" GROUP_ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'g':
gid = check_numeric(optarg, "gid");
break;
case 'o':
dupgid = 1;
break;
#ifdef EXTENSIONS
case 'r':
(void)save_range(&gp->g_r, optarg);
break;
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupadd");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupadd");
}
if (gp->g_rc == 0) {
gp->g_rv[gp->g_rc].r_from = DEF_LOWUID;
gp->g_rv[gp->g_rc].r_to = DEF_HIGHUID;
gp->g_rc += 1;
}
gp->g_defrc = gp->g_rc;
checkeuid();
if (gid == -1) {
int got_id = 0;
int i;

/*
* Look for a free GID in the command line ranges (if any).
* These start after the ranges specified in the config file.
*/
for (i = gp->g_defrc; !got_id && i < gp->g_rc ; i++) {
got_id = getnextgid(&gid,
gp->g_rv[i].r_from, gp->g_rv[i].r_to);
}
/*
* If there were no free GIDs in the command line ranges,
* try the ranges from the config file (there will always
* be at least one default).
*/
for (i = 0; !got_id && i < gp->g_defrc; i++) {
got_id = getnextgid(&gid,
gp->g_rv[i].r_from, gp->g_rv[i].r_to);
}
if (!got_id)
errx(EXIT_FAILURE, "Can't add group: can't get next gid");
}
if (!dupgid && getgrgid((gid_t) gid) != NULL) {
errx(EXIT_FAILURE, "Can't add group: gid %d is a duplicate",
gid);
}
if (!valid_group(*argv)) {
warnx("Invalid group name `%s'", *argv);
}
openlog("groupadd", LOG_PID, LOG_USER);
if (!creategid(*argv, gid, ""))
exit(EXIT_FAILURE);

return EXIT_SUCCESS;
}

#ifdef EXTENSIONS
#define GROUP_DEL_OPT_EXTENSIONS "v"
#else
#define GROUP_DEL_OPT_EXTENSIONS
#endif

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

while ((c = getopt(argc, argv, "" GROUP_DEL_OPT_EXTENSIONS)) != -1) {
switch(c) {
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupdel");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupdel");
}
if (getgrnam(*argv) == NULL) {
errx(EXIT_FAILURE, "No such group `%s'", *argv);
}
checkeuid();
openlog("groupdel", LOG_PID, LOG_USER);
if (!modify_gid(*argv, NULL))
exit(EXIT_FAILURE);

return EXIT_SUCCESS;
}

#ifdef EXTENSIONS
#define GROUP_MOD_OPT_EXTENSIONS "v"
#else
#define GROUP_MOD_OPT_EXTENSIONS
#endif

/* modify a group */
int
groupmod(int argc, char **argv)
{
struct group *grp;
char buf[MaxEntryLen];
char *newname;
char **cpp;
int dupgid;
int gid;
int cc;
int c;

gid = -1;
dupgid = 0;
newname = NULL;
while ((c = getopt(argc, argv, "g:on:" GROUP_MOD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'g':
gid = check_numeric(optarg, "gid");
break;
case 'o':
dupgid = 1;
break;
case 'n':
memsave(&newname, optarg, strlen(optarg));
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupmod");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupmod");
}
checkeuid();
if (gid < 0 && newname == NULL) {
errx(EXIT_FAILURE, "Nothing to change");
}
if (dupgid && gid < 0) {
errx(EXIT_FAILURE, "Duplicate which gid?");
}
if (!dupgid && getgrgid((gid_t) gid) != NULL) {
errx(EXIT_FAILURE, "Can't modify group: gid %d is a duplicate",
gid);
}
if ((grp = find_group_info(*argv)) == NULL) {
errx(EXIT_FAILURE, "Can't find group `%s' to modify", *argv);
}
if (!is_local(*argv, _PATH_GROUP)) {
errx(EXIT_FAILURE, "Group `%s' must be a local group", *argv);
}
if (newname != NULL && !valid_group(newname)) {
warnx("Invalid group name `%s'", newname);
}
cc = snprintf(buf, sizeof(buf), "%s:%s:%d:",
(newname) ? newname : grp->gr_name,
grp->gr_passwd,
(gid < 0) ? grp->gr_gid : gid);
for (cpp = grp->gr_mem ; *cpp && cc < sizeof(buf) ; cpp++) {
cc += snprintf(&buf[cc], sizeof(buf) - cc, "%s%s", *cpp,
(cpp[1] == NULL) ? "" : ",");
}
cc += snprintf(&buf[cc], sizeof(buf) - cc, "\n");
if (newname != NULL)
free(newname);
openlog("groupmod", LOG_PID, LOG_USER);
if (!modify_gid(*argv, buf))
exit(EXIT_FAILURE);

return EXIT_SUCCESS;
}

#ifdef EXTENSIONS
/* display user information */
int
userinfo(int argc, char **argv)
{
struct passwd *pwp;
struct group *grp;
char buf[MaxEntryLen];
char **cpp;
int exists;
int cc;
int i;

exists = 0;
buf[0] = '\0';
while ((i = getopt(argc, argv, "e")) != -1) {
switch(i) {
case 'e':
exists = 1;
break;
default:
usermgmt_usage("userinfo");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userinfo");
}
pwp = find_user_info(*argv);
if (exists) {
exit((pwp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (pwp == NULL) {
errx(EXIT_FAILURE, "Can't find user `%s'", *argv);
}
(void)printf("login\t%s\n", pwp->pw_name);
(void)printf("passwd\t%s\n", pwp->pw_passwd);
(void)printf("uid\t%d\n", pwp->pw_uid);
for (cc = 0 ; (grp = getgrent()) != NULL ; ) {
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
if (strcmp(*cpp, *argv) == 0 &&
grp->gr_gid != pwp->pw_gid) {
cc += snprintf(&buf[cc], sizeof(buf) - cc,
"%s ", grp->gr_name);
}
}
}
if ((grp = getgrgid(pwp->pw_gid)) == NULL) {
(void)printf("groups\t%d %s\n", pwp->pw_gid, buf);
} else {
(void)printf("groups\t%s %s\n", grp->gr_name, buf);
}
(void)printf("change\t%s", pwp->pw_change > 0 ?
ctime(&pwp->pw_change) : pwp->pw_change == -1 ?
"NEXT LOGIN\n" : "NEVER\n");
(void)printf("class\t%s\n", pwp->pw_class);
(void)printf("gecos\t%s\n", pwp->pw_gecos);
(void)printf("dir\t%s\n", pwp->pw_dir);
(void)printf("shell\t%s\n", pwp->pw_shell);
(void)printf("expire\t%s", pwp->pw_expire ?
ctime(&pwp->pw_expire) : "NEVER\n");
return EXIT_SUCCESS;
}
#endif

#ifdef EXTENSIONS
/* display user information */
int
groupinfo(int argc, char **argv)
{
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");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupinfo");
}
grp = find_group_info(*argv);
if (exists) {
exit((grp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (grp == NULL) {
errx(EXIT_FAILURE, "Can't find group `%s'", *argv);
}
(void)printf("name\t%s\n", grp->gr_name);
(void)printf("passwd\t%s\n", grp->gr_passwd);
(void)printf("gid\t%d\n", grp->gr_gid);
(void)printf("members\t");
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
(void)printf("%s", *cpp);
if (*(cpp + 1)) {
(void) printf(", ");
}
}
(void)fputc('\n', stdout);
return EXIT_SUCCESS;
}
#endif