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NetBSD/usr.sbin/user/user.c

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/* $NetBSD: user.c,v 1.20 2000/05/16 20:23:28 agc Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Alistair G. Crooks.
* 4. 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 1.20 2000/05/16 20:23:28 agc Exp $");
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.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;
/* this struct encapsulates the user information */
typedef struct user_t {
int u_uid; /* uid of user */
char *u_password; /* encrypted password */
char *u_comment; /* comment field */
int u_homeset; /* home dir has been set */
char *u_home; /* home directory */
char *u_primgrp; /* primary group */
int u_groupc; /* # of secondary groups */
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 */
int u_inactive; /* inactive */
int u_mkdir; /* make the home directory */
int u_dupuid; /* duplicate uids are allowed */
char *u_skeldir; /* directory for startup files */
unsigned u_rsize; /* size of range array */
unsigned u_rc; /* # of ranges */
range_t *u_rv; /* the ranges */
unsigned u_defrc; /* # of ranges in defaults */
int u_preserve; /* preserve uids on deletion */
} user_t;
#define CONFFILE "/etc/usermgmt.conf"
#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 "/bin/csh"
#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 (char *) NULL
#endif
#ifndef WAITSECS
#define WAITSECS 10
#endif
#ifndef NOBODY_UID
#define NOBODY_UID 32767
#endif
/* some useful constants */
enum {
MaxShellNameLen = 256,
MaxFileNameLen = MAXPATHLEN,
MaxUserNameLen = 32,
MaxFieldNameLen = 32,
MaxCommandLen = 2048,
MaxEntryLen = 2048,
PasswordLength = 13,
LowGid = DEF_LOWUID,
HighGid = DEF_HIGHUID
};
/* Full paths of programs used here */
#define CHOWN "/usr/sbin/chown"
#define MKDIR "/bin/mkdir"
#define MV "/bin/mv"
#define NOLOGIN "/sbin/nologin"
#define PAX "/bin/pax"
#define RM "/bin/rm"
#define UNSET_EXPIRY "Null (unset)"
static int verbose;
/* if *cpp is non-null, free it, then assign `n' chars of `s' to it */
static void
memsave(char **cpp, char *s, size_t n)
{
if (*cpp != (char *) NULL) {
FREE(*cpp);
}
NEWARRAY(char, *cpp, n + 1, exit(1));
(void) memcpy(*cpp, s, n);
(*cpp)[n] = '\0';
}
/* a replacement for system(3) */
static int
asystem(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);
}
if ((ret = system(buf)) != 0) {
warnx("[Warning] can't system `%s'", buf);
}
return ret;
}
#define NetBSD_1_4_K 104110000
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ < NetBSD_1_4_K)
/* bounds checking strncpy */
static int
strlcpy(char *to, char *from, size_t tosize)
{
size_t n;
int fromsize;
fromsize = strlen(from);
n = MIN(tosize - 1, fromsize);
(void) memcpy(to, from, n);
to[n] = '\0';
return fromsize;
}
#endif
/* return 1 if all of `s' is numeric */
static int
is_number(char *s)
{
for ( ; *s ; s++) {
if (!isdigit(*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)
{
struct dirent *dp;
DIR *dirp;
int n;
if ((dirp = opendir(skeldir)) == (DIR *) NULL) {
warn("can't open source . files dir `%s'", skeldir);
return 0;
}
for (n = 0; (dp = readdir(dirp)) != (struct dirent *) 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, PAX, (verbose) ? "-v" : "", dir);
}
(void) asystem("%s -R -h %d:%d %s", CHOWN, uid, gid, dir);
return n;
}
/* create a group entry with gid `gid' */
static int
creategid(char *group, int gid, char *name)
{
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
int fd;
int cc;
if (getgrnam(group) != (struct group *) NULL) {
warnx("group `%s' already exists", group);
return 0;
}
if ((from = fopen(_PATH_GROUP, "r")) == (FILE *) NULL) {
warn("can't create gid for %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) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == (FILE *) NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
while ((cc = fread(buf, sizeof(char), sizeof(buf), from)) > 0) {
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: short write to `%s'", 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 gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
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")) == (FILE *) NULL) {
warn("can't create gid for %s: can't open %s", group, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == (FILE *) NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
groupc = strlen(group);
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warn("badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
if (entc == groupc && strncmp(group, buf, (unsigned) entc) == 0) {
if (newent == NULL) {
continue;
} else {
cc = strlen(newent);
(void) strlcpy(buf, newent, sizeof(buf));
}
}
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
}
(void) fclose(from);
(void) fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
return 1;
}
/* return 1 if `login' is a valid login name */
static int
valid_login(char *login)
{
char *cp;
for (cp = login ; *cp ; cp++) {
if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') {
return 0;
}
}
return 1;
}
/* return 1 if `group' is a valid group name */
static int
valid_group(char *group)
{
char *cp;
for (cp = group ; *cp ; cp++) {
if (!isalnum(*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) == (struct group *) NULL) {
return 1;
}
}
return 0;
}
#ifdef EXTENSIONS
/* save a range of uids */
static int
save_range(user_t *up, char *cp)
{
int from;
int to;
int i;
if (up->u_rsize == 0) {
up->u_rsize = 32;
NEWARRAY(range_t, up->u_rv, up->u_rsize, return(0));
} else if (up->u_rc == up->u_rsize) {
up->u_rsize *= 2;
RENEW(range_t, up->u_rv, up->u_rsize, return(0));
}
if (up->u_rv && sscanf(cp, "%d..%d", &from, &to) == 2) {
for (i = 0 ; 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 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;
int i;
(void) snprintf(template, sizeof(template), "%s.XXXXXX", CONFFILE);
if ((fd = mkstemp(template)) < 0) {
warnx("can't mkstemp `%s' for writing", CONFFILE);
return 0;
}
if ((fp = fdopen(fd, "w")) == (FILE *) NULL) {
warn("can't fdopen `%s' for writing", CONFFILE);
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, "inactive\t%d\n", up->u_inactive) <= 0 ||
fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL) ? UNSET_EXPIRY : up->u_expire) <= 0) {
warn("can't write to `%s'", CONFFILE);
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 write to `%s'", CONFFILE);
ret = 0;
}
}
#endif
(void) fclose(fp);
if (ret) {
ret = ((rename(template, CONFFILE) == 0) && (chmod(CONFFILE, 0644) == 0));
}
return ret;
}
/* read the defaults file */
static void
read_defaults(user_t *up)
{
struct stat st;
size_t lineno;
size_t len;
FILE *fp;
char *cp;
char *s;
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));
up->u_rsize = 16;
NEWARRAY(range_t, up->u_rv, up->u_rsize, exit(1));
up->u_inactive = DEF_INACTIVE;
up->u_expire = DEF_EXPIRE;
if ((fp = fopen(CONFFILE, "r")) == (FILE *) NULL) {
if (stat(CONFFILE, &st) < 0 && !setdefaults(up)) {
warn("can't create `%s' defaults file", CONFFILE);
}
fp = fopen(CONFFILE, "r");
}
if (fp != (FILE *) NULL) {
while ((s = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) {
if (strncmp(s, "group", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_primgrp, cp, strlen(cp));
} else if (strncmp(s, "base_dir", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_basedir, cp, strlen(cp));
} else if (strncmp(s, "skel_dir", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_skeldir, cp, strlen(cp));
} else if (strncmp(s, "shell", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_shell, cp, strlen(cp));
} else if (strncmp(s, "inactive", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
up->u_inactive = atoi(cp);
#ifdef EXTENSIONS
} else if (strncmp(s, "range", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
(void) save_range(up, cp);
#endif
#ifdef EXTENSIONS
} else if (strncmp(s, "preserve", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
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) {
for (cp = s + 6 ; *cp && isspace(*cp) ; cp++) {
}
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));
}
}
(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)) == (struct passwd *) NULL && *uid != NOBODY_UID) {
if (sync_uid_gid) {
if (getgrgid((gid_t)(*uid)) == (struct group *) NULL) {
return 1;
}
} else {
return 1;
}
}
}
return 0;
}
/* add a user */
static int
adduser(char *login, user_t *up)
{
struct group *grp;
struct stat st;
struct tm tm;
time_t expire;
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)) {
errx(EXIT_FAILURE, "`%s' is not a valid login name", login);
}
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
(void) close(masterfd);
err(EXIT_FAILURE, "can't obtain pw_lock");
}
while ((cc = read(masterfd, buf, sizeof(buf))) > 0) {
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
(void) close(masterfd);
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc);
}
}
/* 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) {
for (i = 0 ; i < up->u_rc ; i++) {
if (getnextuid(sync_uid_gid, &up->u_uid, up->u_rv[i].r_from, up->u_rv[i].r_to)) {
break;
}
}
if (i == up->u_rc) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "can't get next uid for %d", up->u_uid);
}
}
/* check uid isn't already allocated */
if (!up->u_dupuid && getpwuid((uid_t)(up->u_uid)) != (struct passwd *) NULL) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "uid %d is already in use", up->u_uid);
}
/* if -g=uid was specified, check gid is unused */
if (sync_uid_gid) {
if (getgrgid((gid_t)(up->u_uid)) != (struct group *) NULL) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "gid %d is already in use", up->u_uid);
}
gid = up->u_uid;
} else if ((grp = getgrnam(up->u_primgrp)) != (struct group *) NULL) {
gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid((gid_t)atoi(up->u_primgrp))) != (struct group *) NULL) {
gid = grp->gr_gid;
} else {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "group %s not found", up->u_primgrp);
}
/* check name isn't already in use */
if (!up->u_dupuid && getpwnam(login) != (struct passwd *) NULL) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "already a `%s' user", login);
}
if (up->u_homeset) {
(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);
}
expire = 0;
if (up->u_expire != NULL) {
(void) memset(&tm, 0, sizeof(tm));
if (strptime(up->u_expire, "%c", &tm) == NULL) {
warnx("invalid time format `%s'", optarg);
} else {
expire = mktime(&tm);
}
}
password[PasswordLength] = '\0';
if (up->u_password != NULL &&
strlen(up->u_password) == PasswordLength) {
(void) memcpy(password, up->u_password, PasswordLength);
} else {
(void) memset(password, '*', PasswordLength);
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::%d:%ld:%s:%s:%s\n",
login,
password,
up->u_uid,
gid,
up->u_inactive,
(long) expire,
up->u_comment,
home,
up->u_shell);
if (write(ptmpfd, buf, (size_t) cc) != cc) {
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't add `%s'", buf);
}
if (up->u_mkdir) {
if (lstat(home, &st) < 0 && asystem("%s -p %s", MKDIR, home) != 0) {
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't mkdir `%s'", home);
}
(void) copydotfiles(up->u_skeldir, up->u_uid, gid, home);
}
if (strcmp(up->u_primgrp, "=uid") == 0 &&
getgrnam(login) == (struct group *) NULL &&
!creategid(login, gid, login)) {
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't create gid %d for login name %s", gid, login);
}
(void) close(ptmpfd);
if (pw_mkdb() < 0) {
err(EXIT_FAILURE, "pw_mkdb failed");
}
return 1;
}
/* modify a user */
static int
moduser(char *login, char *newlogin, user_t *up)
{
struct passwd *pwp;
struct group *grp;
struct tm tm;
time_t expire;
size_t loginc;
size_t colonc;
FILE *master;
char password[PasswordLength + 1];
char oldhome[MaxFileNameLen];
char home[MaxFileNameLen];
char buf[MaxFileNameLen];
char *colon;
int masterfd;
int ptmpfd;
int gid;
int cc;
if (!valid_login(newlogin)) {
errx(EXIT_FAILURE, "`%s' is not a valid login name", login);
}
if ((pwp = getpwnam(login)) == (struct passwd *) NULL) {
errx(EXIT_FAILURE, "No such user `%s'", login);
}
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
(void) close(masterfd);
err(EXIT_FAILURE, "can't obtain pw_lock");
}
if ((master = fdopen(masterfd, "r")) == (FILE *) NULL) {
(void) close(masterfd);
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't fdopen fd for %s", _PATH_MASTERPASSWD);
}
if (up != (user_t *) NULL) {
if (up->u_mkdir) {
(void) strcpy(oldhome, pwp->pw_dir);
}
if (up->u_uid == -1) {
up->u_uid = pwp->pw_uid;
}
/* if -g=uid was specified, check gid is unused */
if (strcmp(up->u_primgrp, "=uid") == 0) {
if (getgrgid((gid_t)(up->u_uid)) != (struct group *) NULL) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "gid %d is already in use", up->u_uid);
}
gid = up->u_uid;
} else if ((grp = getgrnam(up->u_primgrp)) != (struct group *) NULL) {
gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid((gid_t)atoi(up->u_primgrp))) != (struct group *) NULL) {
gid = grp->gr_gid;
} else {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "group %s not found", up->u_primgrp);
}
/* if changing name, check new name isn't already in use */
if (strcmp(login, newlogin) != 0 && getpwnam(newlogin) != (struct passwd *) NULL) {
(void) close(ptmpfd);
(void) pw_abort();
errx(EXIT_FAILURE, "already a `%s' user", newlogin);
}
/* if home directory hasn't been given, use the old one */
if (!up->u_homeset) {
(void) strcpy(home, pwp->pw_dir);
}
expire = 0;
if (up->u_expire != NULL) {
(void) memset(&tm, 0, sizeof(tm));
if (strptime(up->u_expire, "%c", &tm) == NULL) {
warnx("invalid time format `%s'", optarg);
} else {
expire = mktime(&tm);
}
}
password[PasswordLength] = '\0';
if (up->u_password != NULL &&
strlen(up->u_password) == PasswordLength) {
(void) memcpy(password, up->u_password, PasswordLength);
} else {
(void) memcpy(password, pwp->pw_passwd, PasswordLength);
}
if (strcmp(up->u_comment, DEF_COMMENT) == 0) {
memsave(&up->u_comment, pwp->pw_gecos, strlen(pwp->pw_gecos));
}
if (strcmp(up->u_shell, DEF_SHELL) == 0 && strcmp(pwp->pw_shell, DEF_SHELL) != 0) {
memsave(&up->u_comment, pwp->pw_shell, strlen(pwp->pw_shell));
}
}
loginc = strlen(login);
while (fgets(buf, sizeof(buf), master) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warnx("Malformed entry `%s'. Skipping", buf);
continue;
}
colonc = (size_t)(colon - buf);
if (strncmp(login, buf, loginc) == 0 && loginc == colonc) {
if (up != (user_t *) NULL) {
cc = snprintf(buf, sizeof(buf), "%s:%s:%d:%d::%d:%ld:%s:%s:%s\n",
newlogin,
password,
up->u_uid,
gid,
up->u_inactive,
(long) expire,
up->u_comment,
home,
up->u_shell);
if (write(ptmpfd, buf, (size_t) cc) != cc) {
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't add `%s'", buf);
}
}
} else if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
(void) close(masterfd);
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc);
}
}
if (up != (user_t *) NULL &&
up->u_mkdir &&
asystem("%s %s %s", MV, oldhome, home) != 0) {
(void) close(ptmpfd);
(void) pw_abort();
err(EXIT_FAILURE, "can't move `%s' to `%s'", oldhome, home);
}
(void) close(ptmpfd);
if (pw_mkdb() < 0) {
err(EXIT_FAILURE, "pw_mkdb failed");
}
return 1;
}
#ifdef EXTENSIONS
/* see if we can find out the user struct */
static struct passwd *
find_user_info(char *name)
{
struct passwd *pwp;
if ((pwp = getpwnam(name)) != (struct passwd *) NULL) {
return pwp;
}
if (is_number(name) && (pwp = getpwuid((uid_t)atoi(name))) != (struct passwd *) NULL) {
return pwp;
}
return (struct passwd *) NULL;
}
#endif
#ifdef EXTENSIONS
/* see if we can find out the group struct */
static struct group *
find_group_info(char *name)
{
struct group *grp;
if ((grp = getgrnam(name)) != (struct group *) NULL) {
return grp;
}
if (is_number(name) && (grp = getgrgid((gid_t)atoi(name))) != (struct group *) NULL) {
return grp;
}
return (struct group *) NULL;
}
#endif
/* print out usage message, and then exit */
void
usermgmt_usage(char *prog)
{
if (strcmp(prog, "useradd") == 0) {
(void) fprintf(stderr, "Usage: %s -D [-b basedir] [-e expiry] "
"[-f inactive] [-g group] [-r lowuid..highuid] [-s shell]"
"\n", prog);
(void) fprintf(stderr, "Usage: %s [-G group] [-b basedir] "
"[-c comment] [-d homedir] [-e expiry] [-f inactive]\n"
"\t[-g group] [-k skeletondir] [-m] [-o] [-p password] "
"[-r lowuid..highuid] [-s shell]\n\t[-u uid] [-v] user\n",
prog);
} else if (strcmp(prog, "usermod") == 0) {
(void) fprintf(stderr, "Usage: %s [-G group] [-c comment] "
"[-d homedir] [-e expire] [-f inactive] [-g group] "
"[-l newname] [-m] [-o] [-p password] [-s shell] [-u uid] "
"[-v] user\n", prog);
} else if (strcmp(prog, "userdel") == 0) {
(void) fprintf(stderr, "Usage: %s -D [-p preserve]\n", prog);
(void) fprintf(stderr, "Usage: %s [-p preserve] [-r] [-v] "
"user\n", prog);
#ifdef EXTENSIONS
} else if (strcmp(prog, "userinfo") == 0) {
(void) fprintf(stderr, "Usage: %s [-e] [-v] user\n", prog);
#endif
} else if (strcmp(prog, "groupadd") == 0) {
(void) fprintf(stderr, "Usage: %s [-g gid] [-o] [-v] 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 [-g gid] [-o] [-n newname] "
"[-v] 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 [-e] [-v] group\n", prog);
#endif
}
exit(EXIT_FAILURE);
/* NOTREACHED */
}
#ifdef EXTENSIONS
#define ADD_OPT_EXTENSIONS "p:r:v"
#else
#define ADD_OPT_EXTENSIONS
#endif
int
useradd(int argc, char **argv)
{
user_t u;
int defaultfield;
int bigD;
int c;
int i;
(void) memset(&u, 0, sizeof(u));
read_defaults(&u);
u.u_uid = -1;
defaultfield = bigD = 0;
while ((c = getopt(argc, argv, "DG:b:c:d:e:f:g:k:mou:s:" ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'D':
bigD = 1;
break;
case 'G':
while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL &&
u.u_groupc < NGROUPS_MAX) {
if (u.u_groupv[u.u_groupc][0] != 0) {
u.u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX);
}
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':
u.u_homeset = 1;
memsave(&u.u_home, optarg, strlen(optarg));
break;
case 'e':
defaultfield = 1;
memsave(&u.u_expire, optarg, strlen(optarg));
break;
case 'f':
defaultfield = 1;
u.u_inactive = atoi(optarg);
break;
case 'g':
defaultfield = 1;
memsave(&u.u_primgrp, optarg, strlen(optarg));
break;
case 'k':
memsave(&u.u_skeldir, optarg, strlen(optarg));
break;
case 'm':
u.u_mkdir = 1;
break;
case 'o':
u.u_dupuid = 1;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&u.u_password, optarg, strlen(optarg));
break;
#endif
#ifdef EXTENSIONS
case 'r':
defaultfield = 1;
(void) save_range(&u, optarg);
break;
#endif
case 's':
defaultfield = 1;
memsave(&u.u_shell, optarg, strlen(optarg));
break;
case 'u':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric");
}
u.u_uid = atoi(optarg);
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
}
}
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void) printf("group\t\t%s\n", u.u_primgrp);
(void) printf("base_dir\t%s\n", u.u_basedir);
(void) printf("skel_dir\t%s\n", u.u_skeldir);
(void) printf("shell\t\t%s\n", u.u_shell);
(void) printf("inactive\t%d\n", u.u_inactive);
(void) printf("expire\t\t%s\n", (u.u_expire == NULL) ? UNSET_EXPIRY : u.u_expire);
#ifdef EXTENSIONS
for (i = 0 ; i < u.u_rc ; i++) {
(void) printf("range\t\t%d..%d\n", u.u_rv[i].r_from, u.u_rv[i].r_to);
}
#endif
return EXIT_SUCCESS;
}
if (argc == optind) {
usermgmt_usage("useradd");
}
checkeuid();
return adduser(argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define MOD_OPT_EXTENSIONS "p:v"
#else
#define MOD_OPT_EXTENSIONS
#endif
int
usermod(int argc, char **argv)
{
user_t u;
char newuser[MaxUserNameLen + 1];
int have_new_user;
int c;
(void) memset(&u, 0, sizeof(u));
(void) memset(newuser, 0, sizeof(newuser));
read_defaults(&u);
u.u_uid = -1;
have_new_user = 0;
while ((c = getopt(argc, argv, "G:c:d:e:f:g:l:mos:u:" MOD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'G':
while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL &&
u.u_groupc < NGROUPS_MAX) {
if (u.u_groupv[u.u_groupc][0] != 0) {
u.u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX);
}
break;
case 'c':
memsave(&u.u_comment, optarg, strlen(optarg));
break;
case 'd':
u.u_homeset = 1;
memsave(&u.u_home, optarg, strlen(optarg));
break;
case 'e':
memsave(&u.u_expire, optarg, strlen(optarg));
break;
case 'f':
u.u_inactive = atoi(optarg);
break;
case 'g':
memsave(&u.u_primgrp, optarg, strlen(optarg));
break;
case 'l':
have_new_user = 1;
(void) strlcpy(newuser, optarg, sizeof(newuser));
break;
case 'm':
u.u_mkdir = 1;
break;
case 'o':
u.u_dupuid = 1;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&u.u_password, optarg, strlen(optarg));
break;
#endif
case 's':
memsave(&u.u_shell, optarg, strlen(optarg));
break;
case 'u':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric");
}
u.u_uid = atoi(optarg);
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
}
}
if (argc == optind) {
usermgmt_usage("usermod");
}
checkeuid();
return moduser(argv[optind], (have_new_user) ? newuser : argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define DEL_OPT_EXTENSIONS "Dp:v"
#else
#define DEL_OPT_EXTENSIONS
#endif
int
userdel(int argc, char **argv)
{
struct passwd *pwp;
struct stat st;
user_t u;
char password[PasswordLength + 1];
int defaultfield;
int rmhome;
int bigD;
int c;
(void) memset(&u, 0, sizeof(u));
read_defaults(&u);
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 'p':
defaultfield = 1;
u.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
}
}
#ifdef EXTENSIONS
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void) printf("preserve\t%s\n", (u.u_preserve) ? "true" : "false");
return EXIT_SUCCESS;
}
#endif
if (argc == optind) {
usermgmt_usage("userdel");
}
checkeuid();
if ((pwp = getpwnam(argv[optind])) == (struct passwd *) NULL) {
warnx("No such user `%s'", argv[optind]);
return EXIT_FAILURE;
}
if (rmhome) {
if (stat(pwp->pw_dir, &st) < 0) {
warn("Home directory `%s' does not exist", pwp->pw_dir);
return EXIT_FAILURE;
}
(void) asystem("%s -rf %s", RM, pwp->pw_dir);
}
if (u.u_preserve) {
memsave(&u.u_shell, NOLOGIN, strlen(NOLOGIN));
(void) memset(password, '*', PasswordLength);
password[PasswordLength] = '\0';
memsave(&u.u_password, password, PasswordLength);
return moduser(argv[optind], argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
return moduser(argv[optind], argv[optind], (user_t *) NULL) ? EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define GROUP_ADD_OPT_EXTENSIONS "v"
#else
#define GROUP_ADD_OPT_EXTENSIONS
#endif
/* add a group */
int
groupadd(int argc, char **argv)
{
int dupgid;
int gid;
int c;
gid = -1;
dupgid = 0;
while ((c = getopt(argc, argv, "g:o" GROUP_ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'g':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric");
}
gid = atoi(optarg);
break;
case 'o':
dupgid = 1;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
}
}
if (argc == optind) {
usermgmt_usage("groupadd");
}
checkeuid();
if (gid < 0 && !getnextgid(&gid, LowGid, HighGid)) {
err(EXIT_FAILURE, "can't add group: can't get next gid");
}
if (!dupgid && getgrgid((gid_t) gid) != (struct group *) NULL) {
errx(EXIT_FAILURE, "can't add group: gid %d is a duplicate", gid);
}
if (!valid_group(argv[optind])) {
warnx("warning - invalid group name `%s'", argv[optind]);
}
if (!creategid(argv[optind], gid, "")) {
err(EXIT_FAILURE, "can't add group: problems with %s file", _PATH_GROUP);
}
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
}
}
if (argc == optind) {
usermgmt_usage("groupdel");
}
checkeuid();
if (!modify_gid(argv[optind], NULL)) {
err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP);
}
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':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric");
}
gid = atoi(optarg);
break;
case 'o':
dupgid = 1;
break;
case 'n':
memsave(&newname, optarg, strlen(optarg));
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
}
}
if (argc == optind) {
usermgmt_usage("groupmod");
}
checkeuid();
if (gid < 0 && newname == NULL) {
err(EXIT_FAILURE, "Nothing to change");
}
if (dupgid && gid < 0) {
err(EXIT_FAILURE, "Duplicate which gid?");
}
if ((grp = getgrnam(argv[optind])) == (struct group *) NULL) {
err(EXIT_FAILURE, "can't find group `%s' to modify", argv[optind]);
}
if (newname != NULL && !valid_group(newname)) {
warn("warning - 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) ? "" : ",");
}
if (!modify_gid(argv[optind], buf)) {
err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP);
}
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;
while ((i = getopt(argc, argv, "ev")) != -1) {
switch(i) {
case 'e':
exists = 1;
break;
case 'v':
verbose = 1;
break;
}
}
if (argc == optind) {
usermgmt_usage("userinfo");
}
pwp = find_user_info(argv[optind]);
if (exists) {
exit((pwp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (pwp == (struct passwd *) NULL) {
errx(EXIT_FAILURE, "can't find user `%s'", argv[optind]);
}
(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()) != (struct group *) NULL ; ) {
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
if (strcmp(*cpp, argv[optind]) == 0 && grp->gr_gid != pwp->pw_gid) {
cc += snprintf(&buf[cc], sizeof(buf) - cc, "%s ", grp->gr_name);
}
}
}
if ((grp = getgrgid(pwp->pw_gid)) == (struct group *) 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", ctime(&pwp->pw_change));
(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", ctime(&pwp->pw_expire));
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;
}
}
if (argc == optind) {
usermgmt_usage("groupinfo");
}
grp = find_group_info(argv[optind]);
if (exists) {
exit((grp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (grp == (struct group *) NULL) {
errx(EXIT_FAILURE, "can't find group `%s'", argv[optind]);
}
(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);
}
(void) fputc('\n', stdout);
return EXIT_SUCCESS;
}
#endif
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