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shadow/src/newusers.c

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/*
* Copyright 1990 - 1993, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* 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>
#include "rcsid.h"
RCSID(PKG_VER "$Id: newusers.c,v 1.11 2000/08/26 18:27:18 marekm Exp $")
#include <sys/types.h>
#include <sys/stat.h>
#include "prototypes.h"
#include "defines.h"
#include <stdio.h>
#include <pwd.h>
#include <grp.h>
#include <fcntl.h>
static char *Prog;
#include "getdef.h"
#include "pwio.h"
#include "groupio.h"
#ifdef SHADOWPWD
#include "shadowio.h"
static int is_shadow;
#endif
/* local function prototypes */
static void usage(void);
static int add_group(const char *, const char *, gid_t *);
static int add_user(const char *, const char *, uid_t *, gid_t);
static void update_passwd(struct passwd *, const char *);
static int add_passwd(struct passwd *, const char *);
/*
* usage - display usage message and exit
*/
static void
usage(void)
{
fprintf(stderr, _("Usage: %s [ input ]\n"), Prog);
exit(1);
}
/*
* 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)
{
const struct passwd *pwd;
const struct group *grp;
struct group grent;
char *members[2];
int i;
/*
* Start by seeing if the named group already exists. This
* will be very easy to deal with if it does.
*/
if ((grp = gr_locate (gid))) {
add_member:
grent = *grp;
*ngid = grent.gr_gid;
for (i = 0;grent.gr_mem[i] != (char *) 0;i++)
if (strcmp (grent.gr_mem[i], name) == 0)
return 0;
grent.gr_mem = (char **) xmalloc (sizeof (char *) * (i + 2));
memcpy (grent.gr_mem, grp->gr_mem, sizeof (char *) * (i + 2));
grent.gr_mem[i] = xstrdup (name);
grent.gr_mem[i + 1] = (char *) 0;
return ! gr_update (&grent);
}
/*
* The group did not exist, so I try to figure out what the
* GID is going to be. The gid parameter is probably "", meaning
* I figure out the GID from the password file. I want the UID
* and GID to match, unless the GID is already used.
*/
if (gid[0] == '\0') {
i = 100;
for (pw_rewind ();(pwd = pw_next ());) {
if (pwd->pw_uid >= i)
i = pwd->pw_uid + 1;
}
for (gr_rewind ();(grp = gr_next ());) {
if (grp->gr_gid == i) {
i = -1;
break;
}
}
} else if (gid[0] >= '0' && gid[0] <= '9') {
/*
* The GID is a number, which means either this is a brand new
* group, or an existing group. For existing groups I just add
* myself as a member, just like I did earlier.
*/
i = atoi (gid);
for (gr_rewind ();(grp = gr_next ());)
if (grp->gr_gid == i)
goto add_member;
} else
/*
* The last alternative is that the GID is a name which is not
* already the name of an existing group, and I need to figure
* out what group ID that group name is going to have.
*/
i = -1;
/*
* If I don't have a group ID by now, I'll go get the
* next one.
*/
if (i == -1) {
for (i = 100, gr_rewind ();(grp = gr_next ());)
if (grp->gr_gid >= i)
i = grp->gr_gid + 1;
}
/*
* Now I have all of the fields required to create the new
* group.
*/
if (gid[0] && (gid[0] <= '0' || gid[0] >= '9'))
grent.gr_name = xstrdup(gid);
else
grent.gr_name = xstrdup(name);
grent.gr_passwd = "x"; /* XXX warning: const */
grent.gr_gid = i;
members[0] = xstrdup(name);
members[1] = (char *) 0;
grent.gr_mem = members;
*ngid = grent.gr_gid;
return ! gr_update (&grent);
}
/*
* add_user - create a new user ID
*/
static int
add_user(const char *name, const char *uid, uid_t *nuid, gid_t gid)
{
const struct passwd *pwd;
struct passwd pwent;
uid_t i;
/*
* The first guess for the UID is either the numerical UID
* that the caller provided, or the next available UID.
*/
if (uid[0] >= '0' && uid[0] <= '9') {
i = atoi (uid);
} else if (uid[0] && (pwd = pw_locate (uid))) {
i = pwd->pw_uid;
} else {
i = 100;
for (pw_rewind ();(pwd = pw_next ());)
if (pwd->pw_uid >= i)
i = pwd->pw_uid + 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_passwd = "x"; /* XXX warning: const */
#ifdef ATT_AGE
pwent.pw_age = "";
#endif
#ifdef ATT_COMMENT
pwent.pw_comment = "";
#endif
#ifdef BSD_QUOTA
pwent.pw_quota = 0;
#endif
pwent.pw_uid = i;
pwent.pw_gid = gid;
pwent.pw_gecos = ""; /* XXX warning: const */
pwent.pw_dir = ""; /* XXX warning: const */
pwent.pw_shell = ""; /* XXX warning: const */
*nuid = i;
return ! pw_update (&pwent);
}
static void
update_passwd(struct passwd *pwd, const char *passwd)
{
pwd->pw_passwd = pw_encrypt(passwd, crypt_make_salt());
#ifdef ATT_AGE
if (strlen(pwd->pw_age) == 4) {
static char newage[5];
extern char *l64a();
strcpy(newage, pwd->pw_age);
strcpy(newage + 2, l64a(time((time_t *) 0) / WEEK));
pwd->pw_age = newage;
}
#endif
}
/*
* add_passwd - add or update the encrypted password
*/
static int
add_passwd(struct passwd *pwd, const char *passwd)
{
#ifdef SHADOWPWD
const struct spwd *sp;
struct spwd spent;
#endif
/*
* 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) {
update_passwd(pwd, passwd);
return 0;
}
#ifdef SHADOWPWD
/*
* Do the first and easiest shadow file case. The user
* already exists in the shadow password file.
*/
if ((sp = spw_locate (pwd->pw_name))) {
spent = *sp;
spent.sp_pwdp = pw_encrypt(passwd, crypt_make_salt());
return ! spw_update (&spent);
}
/*
* 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) {
update_passwd(pwd, passwd);
return 0;
}
/*
* Now the really hard case - I need to create an entirely
* new shadow password file entry.
*/
spent.sp_namp = pwd->pw_name;
spent.sp_pwdp = pw_encrypt(passwd, crypt_make_salt());
spent.sp_lstchg = time((time_t *) 0) / SCALE;
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 = -1;
return ! spw_update (&spent);
#endif
}
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;
Prog = Basename(argv[0]);
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
if (argc > 1 && argv[1][0] == '-')
usage ();
if (argc == 2) {
if (! freopen (argv[1], "r", stdin)) {
snprintf(buf, sizeof buf, "%s: %s", Prog, argv[1]);
perror (buf);
exit (1);
}
}
/*
* 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()) {
fprintf (stderr, _("%s: can't lock /etc/passwd.\n"), Prog);
exit (1);
}
#ifdef SHADOWPWD
is_shadow = spw_file_present();
if ((is_shadow && !spw_lock()) || !gr_lock())
#else
if (!gr_lock())
#endif
{
fprintf (stderr, _("%s: can't lock files, try again later\n"),
Prog);
(void) pw_unlock ();
#ifdef SHADOWPWD
if (is_shadow)
spw_unlock();
#endif
exit (1);
}
#ifdef SHADOWPWD
if (!pw_open(O_RDWR) || (is_shadow && !spw_open(O_RDWR)) || !gr_open(O_RDWR))
#else
if (!pw_open(O_RDWR) || !gr_open(O_RDWR))
#endif
{
fprintf (stderr, _("%s: can't open files\n"), Prog);
(void) pw_unlock ();
#ifdef SHADOWPWD
if (is_shadow)
spw_unlock();
#endif
(void) gr_unlock ();
exit (1);
}
/*
* Read each line. The line has the same format as a password
* file entry, except that certain fields are not contrained 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) != (char *) 0) {
line++;
if ((cp = strrchr (buf, '\n'))) {
*cp = '\0';
} else {
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;
if ((cp = strchr (cp, ':')))
*cp++ = '\0';
else
break;
}
if (nfields != 6) {
fprintf (stderr, _("%s: line %d: invalid line\n"),
Prog, line);
continue;
}
/*
* Now the fields are processed one by one. The first
* field to be processed is the group name. A new
* group will be created if the group name is non-numeric
* and does not already exist. The named user will be
* the only member. 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 (! (pw = pw_locate (fields[0])) &&
add_group (fields[0], fields[3], &gid)) {
fprintf (stderr, _("%s: line %d: can't create GID\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 (! pw && add_user (fields[0], fields[2], &uid, gid)) {
fprintf (stderr, _("%s: line %d: can't create UID\n"),
Prog, line);
errors++;
continue;
}
/*
* The password, gecos field, directory, and shell fields
* all come next.
*/
if (! (pw = pw_locate (fields[0]))) {
fprintf (stderr, _("%s: line %d: cannot find user %s\n"),
Prog, line, fields[0]);
errors++;
continue;
}
newpw = *pw;
if (add_passwd (&newpw, fields[1])) {
fprintf (stderr, _("%s: line %d: can't update password\n"),
Prog, line);
errors++;
continue;
}
if (fields[4][0])
newpw.pw_gecos = fields[4];
if (fields[5][0])
newpw.pw_dir = fields[5];
if (fields[6][0])
newpw.pw_shell = fields[6];
if (newpw.pw_dir[0] && access(newpw.pw_dir, F_OK)) {
if (mkdir (newpw.pw_dir,
0777 & ~getdef_num("UMASK", 077)))
fprintf (stderr, _("%s: line %d: mkdir failed\n"),
Prog, line);
else if (chown (newpw.pw_dir,
newpw.pw_uid, newpw.pw_gid))
fprintf (stderr, _("%s: line %d: chown failed\n"),
Prog, line);
}
/*
* Update the password entry with the new changes made.
*/
if (! pw_update (&newpw)) {
fprintf (stderr, _("%s: line %d: can't update entry\n"),
Prog, line);
errors++;
continue;
}
}
/*
* 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 (errors) {
fprintf (stderr, _("%s: error detected, changes ignored\n"), Prog);
(void) gr_unlock ();
#ifdef SHADOWPWD
if (is_shadow)
spw_unlock();
#endif
(void) pw_unlock ();
exit (1);
}
#ifdef SHADOWPWD
if (!pw_close() || (is_shadow && !spw_close()) || !gr_close())
#else
if (!pw_close() || ! gr_close())
#endif
{
fprintf (stderr, _("%s: error updating files\n"), Prog);
(void) gr_unlock ();
#ifdef SHADOWPWD
if (is_shadow)
spw_unlock();
#endif
(void) pw_unlock ();
exit (1);
}
(void) gr_unlock ();
#ifdef SHADOWPWD
if (is_shadow)
spw_unlock();
#endif
(void) pw_unlock ();
exit (0);
/*NOTREACHED*/
}
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