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shadow/src/newusers.c
Alejandro Colomar efbbcade43 Use safer allocation macros 
Use of these macros, apart from the benefits mentioned in the commit
that adds the macros, has some other good side effects:

-  Consistency in getting the size of the object from sizeof(type),
   instead of a mix of sizeof(type) sometimes and sizeof(*p) other
   times.

-  More readable code: no casts, and no sizeof(), so also shorter lines
   that we don't need to cut.

-  Consistency in using array allocation calls for allocations of arrays
   of objects, even when the object size is 1.

Cc: Valentin V. Bartenev <vbartenev@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-02-23 20:28:43 -06:00

1354 lines
35 KiB
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/*
* SPDX-FileCopyrightText: 1990 - 1993, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* newusers - create users from a batch file
*
* newusers creates a collection of entries in /etc/passwd
* and related files by reading a passwd-format file and
* adding entries in the related directories.
*/
#include <config.h>
#ident "$Id$"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <pwd.h>
#include <grp.h>
#include <fcntl.h>
#include <getopt.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include "alloc.h"
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
#include "pam_defs.h"
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
#include "prototypes.h"
#include "defines.h"
#include "getdef.h"
#include "groupio.h"
#include "nscd.h"
#include "sssd.h"
#include "pwio.h"
#include "sgroupio.h"
#include "shadowio.h"
#ifdef ENABLE_SUBIDS
#include "subordinateio.h"
#endif /* ENABLE_SUBIDS */
#include "chkname.h"
#include "shadowlog.h"
/*
* Global variables
*/
const char *Prog;
static bool rflg = false; /* create a system account */
#ifndef USE_PAM
static /*@null@*//*@observer@*/char *crypt_method = NULL;
#define cflg (NULL != crypt_method)
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT)
static bool sflg = false;
#endif
#ifdef USE_SHA_CRYPT
static long sha_rounds = 5000;
#endif /* USE_SHA_CRYPT */
#ifdef USE_BCRYPT
static long bcrypt_rounds = 13;
#endif /* USE_BCRYPT */
#ifdef USE_YESCRYPT
static long yescrypt_cost = 5;
#endif /* USE_YESCRYPT */
#endif /* !USE_PAM */
static bool is_shadow;
#ifdef SHADOWGRP
static bool is_shadow_grp;
static bool sgr_locked = false;
#endif
static bool pw_locked = false;
static bool gr_locked = false;
static bool spw_locked = false;
#ifdef ENABLE_SUBIDS
static bool is_sub_uid = false;
static bool is_sub_gid = false;
static bool sub_uid_locked = false;
static bool sub_gid_locked = false;
#endif /* ENABLE_SUBIDS */
/* local function prototypes */
static void usage (int status);
static void fail_exit (int);
static int add_group (const char *, const char *, gid_t *, gid_t);
static int get_user_id (const char *, uid_t *);
static int add_user (const char *, uid_t, gid_t);
#ifndef USE_PAM
static int update_passwd (struct passwd *, const char *);
#endif /* !USE_PAM */
static int add_passwd (struct passwd *, const char *);
static void process_flags (int argc, char **argv);
static void check_flags (void);
static void check_perms (void);
static void open_files (void);
static void close_files (void);
extern int allow_bad_names;
/*
* usage - display usage message and exit
*/
static void usage (int status)
{
FILE *usageout = (EXIT_SUCCESS != status) ? stderr : stdout;
(void) fprintf (usageout,
_("Usage: %s [options]\n"
"\n"
"Options:\n"),
Prog);
(void) fputs (_(" -b, --badname allow bad names\n"), usageout);
#ifndef USE_PAM
(void) fprintf (usageout,
_(" -c, --crypt-method METHOD the crypt method (one of %s)\n"),
"NONE DES MD5"
#if defined(USE_SHA_CRYPT)
" SHA256 SHA512"
#endif
#if defined(USE_BCRYPT)
" BCRYPT"
#endif
#if defined(USE_YESCRYPT)
" YESCRYPT"
#endif
);
#endif /* !USE_PAM */
(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
(void) fputs (_(" -r, --system create system accounts\n"), usageout);
(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
(void) fputs (_(" -s, --sha-rounds number of rounds for the SHA, BCRYPT\n"
" or YESCRYPT crypt algorithms\n"),
usageout);
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
#endif /* !USE_PAM */
(void) fputs ("\n", usageout);
exit (status);
}
/*
* fail_exit - undo as much as possible
*/
static void fail_exit (int code)
{
if (spw_locked) {
if (spw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
/* continue */
}
}
if (pw_locked) {
if (pw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
}
if (gr_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
}
#ifdef SHADOWGRP
if (sgr_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
}
#endif
#ifdef ENABLE_SUBIDS
if (sub_uid_locked) {
if (sub_uid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
/* continue */
}
}
if (sub_gid_locked) {
if (sub_gid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
/* continue */
}
}
#endif /* ENABLE_SUBIDS */
exit (code);
}
/*
* add_group - create a new group or add a user to an existing group
*/
static int add_group (const char *name, const char *gid, gid_t *ngid, uid_t uid)
{
const struct group *grp;
struct group grent;
char *members[1];
#ifdef SHADOWGRP
const struct sgrp *sg;
#endif
/*
* Start by seeing if the named group already exists. This will be
* very easy to deal with if it does.
*/
grp = getgrnam (gid);
if (NULL == grp) {
grp = gr_locate (gid);
}
if (NULL != grp) {
/* The user will use this ID for her primary group */
*ngid = grp->gr_gid;
/* Don't check gshadow */
return 0;
}
if (isdigit (gid[0])) {
/*
* The GID is a number, which means either this is a brand
* new group, or an existing group.
*/
if (get_gid (gid, &grent.gr_gid) == 0) {
fprintf (stderr,
_("%s: invalid group ID '%s'\n"),
Prog, gid);
return -1;
}
/* Look in both the system database (getgrgid) and in the
* internal database (gr_locate_gid), which may contain
* uncommitted changes */
if ( (getgrgid (grent.gr_gid) != NULL)
|| (gr_locate_gid (grent.gr_gid) != NULL)) {
/* The user will use this ID for her
* primary group */
*ngid = grent.gr_gid;
return 0;
}
/* Do not create groups with GID == (gid_t)-1 */
if (grent.gr_gid == (gid_t)-1) {
fprintf (stderr,
_("%s: invalid group ID '%s'\n"),
Prog, gid);
return -1;
}
} else {
/* The gid parameter can be "" or a name which is not
* already the name of an existing group.
* In both cases, figure out what group ID can be used.
*/
if (find_new_gid(rflg, &grent.gr_gid, &uid) < 0) {
return -1;
}
}
/*
* Now I have all of the fields required to create the new group.
*/
if (('\0' != gid[0]) && (!isdigit (gid[0]))) {
grent.gr_name = xstrdup (gid);
} else {
grent.gr_name = xstrdup (name);
/* FIXME: check if the group exists */
}
/* Check if this is a valid group name */
if (!is_valid_group_name (grent.gr_name)) {
fprintf (stderr,
_("%s: invalid group name '%s'\n"),
Prog, grent.gr_name);
free (grent.gr_name);
return -1;
}
grent.gr_passwd = "*"; /* XXX warning: const */
members[0] = NULL;
grent.gr_mem = members;
*ngid = grent.gr_gid;
#ifdef SHADOWGRP
if (is_shadow_grp) {
sg = sgr_locate (grent.gr_name);
if (NULL != sg) {
fprintf (stderr,
_("%s: group '%s' is a shadow group, but does not exist in /etc/group\n"),
Prog, grent.gr_name);
return -1;
}
}
#endif
#ifdef SHADOWGRP
if (is_shadow_grp) {
struct sgrp sgrent;
char *admins[1];
sgrent.sg_name = grent.gr_name;
sgrent.sg_passwd = "*"; /* XXX warning: const */
grent.gr_passwd = "x"; /* XXX warning: const */
admins[0] = NULL;
sgrent.sg_adm = admins;
sgrent.sg_mem = members;
if (sgr_update (&sgrent) == 0) {
return -1;
}
}
#endif
if (gr_update (&grent) == 0) {
return -1;
}
return 0;
}
static int get_user_id (const char *uid, uid_t *nuid) {
/*
* The first guess for the UID is either the numerical UID that the
* caller provided, or the next available UID.
*/
if (isdigit (uid[0])) {
if ((get_uid (uid, nuid) == 0) || (*nuid == (uid_t)-1)) {
fprintf (stderr,
_("%s: invalid user ID '%s'\n"),
Prog, uid);
return -1;
}
} else {
if ('\0' != uid[0]) {
const struct passwd *pwd;
/* local, no need for xgetpwnam */
pwd = getpwnam (uid);
if (NULL == pwd) {
pwd = pw_locate (uid);
}
if (NULL != pwd) {
*nuid = pwd->pw_uid;
} else {
fprintf (stderr,
_("%s: user '%s' does not exist\n"),
Prog, uid);
return -1;
}
} else {
if (find_new_uid (rflg, nuid, NULL) < 0) {
return -1;
}
}
}
return 0;
}
/*
* add_user - create a new user ID
*/
static int add_user (const char *name, uid_t uid, gid_t gid)
{
struct passwd pwent;
/* Check if this is a valid user name */
if (!is_valid_user_name (name)) {
fprintf (stderr,
_("%s: invalid user name '%s': use --badname to ignore\n"),
Prog, name);
return -1;
}
/*
* I don't want to fill in the entire password structure members
* JUST YET, since there is still more data to be added. So, I fill
* in the parts that I have.
*/
pwent.pw_name = xstrdup (name);
pwent.pw_uid = uid;
pwent.pw_passwd = "x"; /* XXX warning: const */
pwent.pw_gid = gid;
pwent.pw_gecos = ""; /* XXX warning: const */
pwent.pw_dir = ""; /* XXX warning: const */
pwent.pw_shell = ""; /* XXX warning: const */
return (pw_update (&pwent) == 0) ? -1 : 0;
}
#ifndef USE_PAM
/*
* update_passwd - update the password in the passwd entry
*
* Return 0 if successful.
*/
static int update_passwd (struct passwd *pwd, const char *password)
{
void *crypt_arg = NULL;
char *cp;
if (NULL != crypt_method) {
#if defined(USE_SHA_CRYPT)
if (sflg) {
if ( (0 == strcmp (crypt_method, "SHA256"))
|| (0 == strcmp (crypt_method, "SHA512"))) {
crypt_arg = &sha_rounds;
}
}
#endif /* USE_SHA_CRYPT */
#if defined(USE_BCRYPT)
if (sflg) {
if (0 == strcmp (crypt_method, "BCRYPT")) {
crypt_arg = &bcrypt_rounds;
}
}
#endif /* USE_BCRYPT */
#if defined(USE_YESCRYPT)
if (sflg) {
if (0 == strcmp (crypt_method, "YESCRYPT")) {
crypt_arg = &yescrypt_cost;
}
}
#endif /* USE_YESCRYPT */
}
if ((NULL != crypt_method) && (0 == strcmp(crypt_method, "NONE"))) {
pwd->pw_passwd = (char *)password;
} else {
const char *salt = crypt_make_salt (crypt_method, crypt_arg);
cp = pw_encrypt (password, salt);
if (NULL == cp) {
fprintf (stderr,
_("%s: failed to crypt password with salt '%s': %s\n"),
Prog, salt, strerror (errno));
return 1;
}
pwd->pw_passwd = cp;
}
return 0;
}
#endif /* !USE_PAM */
/*
* add_passwd - add or update the encrypted password
*/
static int add_passwd (struct passwd *pwd, const char *password)
{
const struct spwd *sp;
struct spwd spent;
#ifndef USE_PAM
char *cp;
#endif /* !USE_PAM */
#ifndef USE_PAM
void *crypt_arg = NULL;
if (NULL != crypt_method) {
#if defined(USE_SHA_CRYPT)
if (sflg) {
if ( (0 == strcmp (crypt_method, "SHA256"))
|| (0 == strcmp (crypt_method, "SHA512"))) {
crypt_arg = &sha_rounds;
}
}
#endif /* USE_SHA_CRYPT */
#if defined(USE_BCRYPT)
if (sflg) {
if (0 == strcmp (crypt_method, "BCRYPT")) {
crypt_arg = &bcrypt_rounds;
}
}
#endif /* USE_BCRYPT */
#if defined(USE_YESCRYPT)
if (sflg) {
if (0 == strcmp (crypt_method, "YESCRYPT")) {
crypt_arg = &yescrypt_cost;
}
}
#endif /* USE_PAM */
}
/*
* In the case of regular password files, this is real easy - pwd
* points to the entry in the password file. Shadow files are
* harder since there are zillions of things to do ...
*/
if (!is_shadow) {
return update_passwd (pwd, password);
}
#endif /* USE_PAM */
/*
* Do the first and easiest shadow file case. The user already
* exists in the shadow password file.
*/
sp = spw_locate (pwd->pw_name);
#ifndef USE_PAM
if (NULL != sp) {
spent = *sp;
if ( (NULL != crypt_method)
&& (0 == strcmp(crypt_method, "NONE"))) {
spent.sp_pwdp = (char *)password;
} else {
const char *salt = crypt_make_salt (crypt_method,
crypt_arg);
cp = pw_encrypt (password, salt);
if (NULL == cp) {
fprintf (stderr,
_("%s: failed to crypt password with salt '%s': %s\n"),
Prog, salt, strerror (errno));
return 1;
}
spent.sp_pwdp = cp;
}
spent.sp_lstchg = gettime () / SCALE;
if (0 == spent.sp_lstchg) {
/* Better disable aging than requiring a password
* change */
spent.sp_lstchg = -1;
}
return (spw_update (&spent) == 0);
}
/*
* Pick the next easiest case - the user has an encrypted password
* which isn't equal to "x". The password was set to "x" earlier
* when the entry was created, so this user would have to have had
* the password set someplace else.
*/
if (strcmp (pwd->pw_passwd, "x") != 0) {
return update_passwd (pwd, password);
}
#else /* USE_PAM */
/*
* If there is already a shadow entry, do not touch it.
* If there is already a passwd entry with a password, do not
* touch it.
* The password will be updated later for all users using PAM.
*/
if ( (NULL != sp)
|| (strcmp (pwd->pw_passwd, "x") != 0)) {
return 0;
}
#endif /* USE_PAM */
/*
* Now the really hard case - I need to create an entirely new
* shadow password file entry.
*/
spent.sp_namp = pwd->pw_name;
#ifndef USE_PAM
if ((crypt_method != NULL) && (0 == strcmp(crypt_method, "NONE"))) {
spent.sp_pwdp = (char *)password;
} else {
const char *salt = crypt_make_salt (crypt_method, crypt_arg);
cp = pw_encrypt (password, salt);
if (NULL == cp) {
fprintf (stderr,
_("%s: failed to crypt password with salt '%s': %s\n"),
Prog, salt, strerror (errno));
return 1;
}
spent.sp_pwdp = cp;
}
#else
/*
* Lock the password.
* The password will be updated later for all users using PAM.
*/
spent.sp_pwdp = "!";
#endif
spent.sp_lstchg = gettime () / SCALE;
if (0 == spent.sp_lstchg) {
/* Better disable aging than requiring a password change */
spent.sp_lstchg = -1;
}
spent.sp_min = getdef_num ("PASS_MIN_DAYS", 0);
/* 10000 is infinity this week */
spent.sp_max = getdef_num ("PASS_MAX_DAYS", 10000);
spent.sp_warn = getdef_num ("PASS_WARN_AGE", -1);
spent.sp_inact = -1;
spent.sp_expire = -1;
spent.sp_flag = SHADOW_SP_FLAG_UNSET;
return (spw_update (&spent) == 0);
}
/*
* process_flags - parse the command line options
*
* It will not return if an error is encountered.
*/
static void process_flags (int argc, char **argv)
{
int c;
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
int bad_s;
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
#endif /* !USE_PAM */
static struct option long_options[] = {
{"badname", no_argument, NULL, 'b'},
#ifndef USE_PAM
{"crypt-method", required_argument, NULL, 'c'},
#endif /* !USE_PAM */
{"help", no_argument, NULL, 'h'},
{"system", no_argument, NULL, 'r'},
{"root", required_argument, NULL, 'R'},
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
{"sha-rounds", required_argument, NULL, 's'},
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
#endif /* !USE_PAM */
{NULL, 0, NULL, '\0'}
};
while ((c = getopt_long (argc, argv,
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
"c:bhrs:",
#else /* !USE_SHA_CRYPT && !USE_BCRYPT && !USE_YESCRYPT */
"c:bhr",
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
#else /* USE_PAM */
"bhr",
#endif
long_options, NULL)) != -1) {
switch (c) {
case 'b':
allow_bad_names = true;
break;
#ifndef USE_PAM
case 'c':
crypt_method = optarg;
break;
#endif /* !USE_PAM */
case 'h':
usage (EXIT_SUCCESS);
break;
case 'r':
rflg = true;
break;
case 'R': /* no-op, handled in process_root_flag () */
break;
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
case 's':
sflg = true;
bad_s = 0;
#if defined(USE_SHA_CRYPT)
if ( ( ((0 == strcmp (crypt_method, "SHA256")) || (0 == strcmp (crypt_method, "SHA512")))
&& (0 == getlong(optarg, &sha_rounds)))) {
bad_s = 1;
}
#endif /* USE_SHA_CRYPT */
#if defined(USE_BCRYPT)
if (( (0 == strcmp (crypt_method, "BCRYPT"))
&& (0 == getlong(optarg, &bcrypt_rounds)))) {
bad_s = 1;
}
#endif /* USE_BCRYPT */
#if defined(USE_YESCRYPT)
if (( (0 == strcmp (crypt_method, "YESCRYPT"))
&& (0 == getlong(optarg, &yescrypt_cost)))) {
bad_s = 1;
}
#endif /* USE_YESCRYPT */
if (bad_s != 0) {
fprintf (stderr,
_("%s: invalid numeric argument '%s'\n"),
Prog, optarg);
usage (EXIT_FAILURE);
}
break;
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
#endif /* !USE_PAM */
default:
usage (EXIT_FAILURE);
break;
}
}
if ( (optind != argc)
&& (optind + 1 != argc)) {
usage (EXIT_FAILURE);
}
if (argv[optind] != NULL) {
if (freopen (argv[optind], "r", stdin) == NULL) {
char buf[BUFSIZ];
snprintf (buf, sizeof buf, "%s: %s", Prog, argv[1]);
perror (buf);
fail_exit (EXIT_FAILURE);
}
}
/* validate options */
check_flags ();
}
/*
* check_flags - check flags and parameters consistency
*
* It will not return if an error is encountered.
*/
static void check_flags (void)
{
#ifndef USE_PAM
#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
if (sflg && !cflg) {
fprintf (stderr,
_("%s: %s flag is only allowed with the %s flag\n"),
Prog, "-s", "-c");
usage (EXIT_FAILURE);
}
#endif /* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
if (cflg) {
if ( (0 != strcmp (crypt_method, "DES"))
&& (0 != strcmp (crypt_method, "MD5"))
&& (0 != strcmp (crypt_method, "NONE"))
#ifdef USE_SHA_CRYPT
&& (0 != strcmp (crypt_method, "SHA256"))
&& (0 != strcmp (crypt_method, "SHA512"))
#endif /* USE_SHA_CRYPT */
#ifdef USE_BCRYPT
&& (0 != strcmp (crypt_method, "BCRYPT"))
#endif /* USE_BCRYPT */
#ifdef USE_YESCRYPT
&& (0 != strcmp (crypt_method, "YESCRYPT"))
#endif /* USE_YESCRYPT */
) {
fprintf (stderr,
_("%s: unsupported crypt method: %s\n"),
Prog, crypt_method);
usage (EXIT_FAILURE);
}
}
#endif /* !USE_PAM */
}
/*
* check_perms - check if the caller is allowed to add a group
*
* With PAM support, the setuid bit can be set on groupadd to allow
* non-root users to groups.
* Without PAM support, only users who can write in the group databases
* can add groups.
*
* It will not return if the user is not allowed.
*/
static void check_perms (void)
{
#ifdef ACCT_TOOLS_SETUID
#ifdef USE_PAM
pam_handle_t *pamh = NULL;
int retval;
struct passwd *pampw;
pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
if (NULL == pampw) {
fprintf (stderr,
_("%s: Cannot determine your user name.\n"),
Prog);
fail_exit (EXIT_FAILURE);
}
retval = pam_start ("newusers", pampw->pw_name, &conv, &pamh);
if (PAM_SUCCESS == retval) {
retval = pam_authenticate (pamh, 0);
}
if (PAM_SUCCESS == retval) {
retval = pam_acct_mgmt (pamh, 0);
}
if (PAM_SUCCESS != retval) {
fprintf (stderr, _("%s: PAM: %s\n"),
Prog, pam_strerror (pamh, retval));
SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
if (NULL != pamh) {
(void) pam_end (pamh, retval);
}
fail_exit (EXIT_FAILURE);
}
(void) pam_end (pamh, retval);
#endif /* USE_PAM */
#endif /* ACCT_TOOLS_SETUID */
}
/*
* open_files - lock and open the password, group and shadow databases
*/
static void open_files (void)
{
/*
* Lock the password files and open them for update. This will bring
* all of the entries into memory where they may be searched for an
* modified, or new entries added. The password file is the key - if
* it gets locked, assume the others can be locked right away.
*/
if (pw_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, pw_dbname ());
fail_exit (EXIT_FAILURE);
}
pw_locked = true;
if (is_shadow) {
if (spw_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, spw_dbname ());
fail_exit (EXIT_FAILURE);
}
spw_locked = true;
}
if (gr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, gr_dbname ());
fail_exit (EXIT_FAILURE);
}
gr_locked = true;
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sgr_dbname ());
fail_exit (EXIT_FAILURE);
}
sgr_locked = true;
}
#endif
#ifdef ENABLE_SUBIDS
if (is_sub_uid) {
if (sub_uid_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
sub_uid_locked = true;
}
if (is_sub_gid) {
if (sub_gid_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sub_gid_dbname ());
fail_exit (EXIT_FAILURE);
}
sub_gid_locked = true;
}
#endif /* ENABLE_SUBIDS */
if (pw_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog, pw_dbname ());
fail_exit (EXIT_FAILURE);
}
if (is_shadow && (spw_open (O_CREAT | O_RDWR) == 0)) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog, spw_dbname ());
fail_exit (EXIT_FAILURE);
}
if (gr_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
fail_exit (EXIT_FAILURE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && (sgr_open (O_CREAT | O_RDWR) == 0)) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog, sgr_dbname ());
fail_exit (EXIT_FAILURE);
}
#endif
#ifdef ENABLE_SUBIDS
if (is_sub_uid) {
if (sub_uid_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
}
if (is_sub_gid) {
if (sub_gid_open (O_CREAT | O_RDWR) == 0) {
fprintf (stderr,
_("%s: cannot open %s\n"),
Prog, sub_gid_dbname ());
fail_exit (EXIT_FAILURE);
}
}
#endif /* ENABLE_SUBIDS */
}
/*
* close_files - close and unlock the password, group and shadow databases
*/
static void close_files (void)
{
if (pw_close () == 0) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
fail_exit (EXIT_FAILURE);
}
if (pw_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
/* continue */
}
pw_locked = false;
if (is_shadow) {
if (spw_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
fail_exit (EXIT_FAILURE);
}
if (spw_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, spw_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
/* continue */
}
spw_locked = false;
}
if (gr_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ()));
fail_exit (EXIT_FAILURE);
}
#ifdef ENABLE_SUBIDS
if (is_sub_uid && (sub_uid_close () == 0)) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_uid_dbname ()));
fail_exit (EXIT_FAILURE);
}
if (is_sub_gid && (sub_gid_close () == 0)) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_gid_dbname ()));
fail_exit (EXIT_FAILURE);
}
#endif /* ENABLE_SUBIDS */
if (gr_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
gr_locked = false;
#ifdef SHADOWGRP
if (is_shadow_grp) {
if (sgr_close () == 0) {
fprintf (stderr,
_("%s: failure while writing changes to %s\n"),
Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ()));
fail_exit (EXIT_FAILURE);
}
if (sgr_unlock () == 0) {
fprintf (stderr,
_("%s: failed to unlock %s\n"),
Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
sgr_locked = false;
}
#endif
#ifdef ENABLE_SUBIDS
if (is_sub_uid) {
if (sub_uid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
/* continue */
}
sub_uid_locked = false;
}
if (is_sub_gid) {
if (sub_gid_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
/* continue */
}
sub_gid_locked = false;
}
#endif /* ENABLE_SUBIDS */
}
static bool want_subuids(void)
{
if (get_subid_nss_handle() != NULL)
return false;
if (getdef_ulong ("SUB_UID_COUNT", 65536) == 0)
return false;
return true;
}
static bool want_subgids(void)
{
if (get_subid_nss_handle() != NULL)
return false;
if (getdef_ulong ("SUB_GID_COUNT", 65536) == 0)
return false;
return true;
}
int main (int argc, char **argv)
{
char buf[BUFSIZ];
char *fields[8];
int nfields;
char *cp;
const struct passwd *pw;
struct passwd newpw;
int errors = 0;
int line = 0;
uid_t uid;
gid_t gid;
#ifdef USE_PAM
int *lines = NULL;
char **usernames = NULL;
char **passwords = NULL;
unsigned int nusers = 0;
#endif /* USE_PAM */
Prog = Basename (argv[0]);
log_set_progname(Prog);
log_set_logfd(stderr);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
/* FIXME: will not work with an input file */
process_root_flag ("-R", argc, argv);
OPENLOG ("newusers");
process_flags (argc, argv);
check_perms ();
is_shadow = spw_file_present ();
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present ();
#endif
#ifdef ENABLE_SUBIDS
is_sub_uid = sub_uid_file_present () && !rflg;
is_sub_gid = sub_gid_file_present () && !rflg;
#endif /* ENABLE_SUBIDS */
open_files ();
/*
* Read each line. The line has the same format as a password file
* entry, except that certain fields are not constrained to be
* numerical values. If a group ID is entered which does not already
* exist, an attempt is made to allocate the same group ID as the
* numerical user ID. Should that fail, the next available group ID
* over 100 is allocated. The pw_gid field will be updated with that
* value.
*/
while (fgets (buf, sizeof buf, stdin) != NULL) {
line++;
cp = strrchr (buf, '\n');
if (NULL != cp) {
*cp = '\0';
} else {
if (feof (stdin) == 0) {
fprintf (stderr,
_("%s: line %d: line too long\n"),
Prog, line);
errors++;
continue;
}
}
/*
* Break the string into fields and screw around with them.
* There MUST be 7 colon separated fields, although the
* values aren't that particular.
*/
for (cp = buf, nfields = 0; nfields < 7; nfields++) {
fields[nfields] = cp;
cp = strchr (cp, ':');
if (NULL != cp) {
*cp = '\0';
cp++;
} else {
break;
}
}
if (nfields != 6) {
fprintf (stderr, _("%s: line %d: invalid line\n"),
Prog, line);
errors++;
continue;
}
/*
* First check if we have to create or update a user
*/
pw = pw_locate (fields[0]);
/* local, no need for xgetpwnam */
if ( (NULL == pw)
&& (getpwnam (fields[0]) != NULL)) {
fprintf (stderr, _("%s: cannot update the entry of user %s (not in the passwd database)\n"), Prog, fields[0]);
errors++;
continue;
}
if ( (NULL == pw)
&& (get_user_id (fields[2], &uid) != 0)) {
fprintf (stderr,
_("%s: line %d: can't create user\n"),
Prog, line);
errors++;
continue;
}
/*
* Processed is the group name. A new group will be
* created if the group name is non-numeric and does not
* already exist. If the group name is a number (which is not
* an existing GID), a group with the same name as the user
* will be created, with the given GID. The given or created
* group will be the primary group of the user. If
* there is no named group to be a member of, the UID will
* be figured out and that value will be a candidate for a
* new group, if that group ID exists, a whole new group ID
* will be made up.
*/
if ( (NULL == pw)
&& (add_group (fields[0], fields[3], &gid, uid) != 0)) {
fprintf (stderr,
_("%s: line %d: can't create group\n"),
Prog, line);
errors++;
continue;
}
/*
* Now we work on the user ID. It has to be specified either
* as a numerical value, or left blank. If it is a numerical
* value, that value will be used, otherwise the next
* available user ID is computed and used. After this there
* will at least be a (struct passwd) for the user.
*/
if ( (NULL == pw)
&& (add_user (fields[0], uid, gid) != 0)) {
fprintf (stderr,
_("%s: line %d: can't create user\n"),
Prog, line);
errors++;
continue;
}
/*
* The password, gecos field, directory, and shell fields
* all come next.
*/
pw = pw_locate (fields[0]);
if (NULL == pw) {
fprintf (stderr,
_("%s: line %d: user '%s' does not exist in %s\n"),
Prog, line, fields[0], pw_dbname ());
errors++;
continue;
}
newpw = *pw;
#ifdef USE_PAM
/* keep the list of user/password for later update by PAM */
nusers++;
lines = REALLOCARRAYF(lines, nusers, int);
usernames = REALLOCARRAYF(usernames, nusers, char *);
passwords = REALLOCARRAYF(passwords, nusers, char *);
if (lines == NULL || usernames == NULL || passwords == NULL) {
fprintf (stderr,
_("%s: line %d: %s\n"),
Prog, line, strerror(errno));
errors++;
continue;
}
lines[nusers-1] = line;
usernames[nusers-1] = strdup (fields[0]);
passwords[nusers-1] = strdup (fields[1]);
#endif /* USE_PAM */
if (add_passwd (&newpw, fields[1]) != 0) {
fprintf (stderr,
_("%s: line %d: can't update password\n"),
Prog, line);
errors++;
continue;
}
if ('\0' != fields[4][0]) {
newpw.pw_gecos = fields[4];
}
if ('\0' != fields[5][0]) {
newpw.pw_dir = fields[5];
}
if ('\0' != fields[6][0]) {
newpw.pw_shell = fields[6];
}
if ( ('\0' != fields[5][0])
&& (access (newpw.pw_dir, F_OK) != 0)) {
/* FIXME: should check for directory */
mode_t mode = getdef_num ("HOME_MODE",
0777 & ~getdef_num ("UMASK", GETDEF_DEFAULT_UMASK));
if (newpw.pw_dir[0] != '/') {
fprintf(stderr,
_("%s: line %d: homedir must be an absolute path\n"),
Prog, line);
errors++;
continue;
};
if (mkdir (newpw.pw_dir, mode) != 0) {
fprintf (stderr,
_("%s: line %d: mkdir %s failed: %s\n"),
Prog, line, newpw.pw_dir,
strerror (errno));
} else if (chown (newpw.pw_dir,
newpw.pw_uid,
newpw.pw_gid) != 0) {
fprintf (stderr,
_("%s: line %d: chown %s failed: %s\n"),
Prog, line, newpw.pw_dir,
strerror (errno));
}
}
/*
* Update the password entry with the new changes made.
*/
if (pw_update (&newpw) == 0) {
fprintf (stderr,
_("%s: line %d: can't update entry\n"),
Prog, line);
errors++;
continue;
}
#ifdef ENABLE_SUBIDS
/*
* Add subordinate uids if the user does not have them.
*/
if (is_sub_uid && want_subuids() && !local_sub_uid_assigned(fields[0])) {
uid_t sub_uid_start = 0;
unsigned long sub_uid_count = 0;
if (find_new_sub_uids(&sub_uid_start, &sub_uid_count) == 0) {
if (sub_uid_add(fields[0], sub_uid_start, sub_uid_count) == 0) {
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
}
} else {
fprintf (stderr,
_("%s: can't find subordinate user range\n"),
Prog);
errors++;
}
}
/*
* Add subordinate gids if the user does not have them.
*/
if (is_sub_gid && want_subgids() && !local_sub_gid_assigned(fields[0])) {
gid_t sub_gid_start = 0;
unsigned long sub_gid_count = 0;
if (find_new_sub_gids(&sub_gid_start, &sub_gid_count) == 0) {
if (sub_gid_add(fields[0], sub_gid_start, sub_gid_count) == 0) {
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
}
} else {
fprintf (stderr,
_("%s: can't find subordinate group range\n"),
Prog);
errors++;
}
}
#endif /* ENABLE_SUBIDS */
}
/*
* Any detected errors will cause the entire set of changes to be
* aborted. Unlocking the password file will cause all of the
* changes to be ignored. Otherwise the file is closed, causing the
* changes to be written out all at once, and then unlocked
* afterwards.
*/
if (0 != errors) {
fprintf (stderr,
_("%s: error detected, changes ignored\n"), Prog);
fail_exit (EXIT_FAILURE);
}
close_files ();
nscd_flush_cache ("passwd");
nscd_flush_cache ("group");
sssd_flush_cache (SSSD_DB_PASSWD | SSSD_DB_GROUP);
#ifdef USE_PAM
unsigned int i;
/* Now update the passwords using PAM */
for (i = 0; i < nusers; i++) {
if (do_pam_passwd_non_interactive ("newusers", usernames[i], passwords[i]) != 0) {
fprintf (stderr,
_("%s: (line %d, user %s) password not changed\n"),
Prog, lines[i], usernames[i]);
errors++;
}
}
#endif /* USE_PAM */
return ((0 == errors) ? EXIT_SUCCESS : EXIT_FAILURE);
}
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