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groupadd.c

/*
 * Copyright 1991 - 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.
 */

#include <config.h>

#undef USE_PAM

#include "rcsid.h"
RCSID (PKG_VER "$Id: groupadd.c 6 2005-03-20 15:34:28Z bubulle $")
#include <sys/types.h>
#include <stdio.h>
#include <grp.h>
#include <ctype.h>
#include <fcntl.h>
#include "defines.h"
#include "prototypes.h"
#include "chkname.h"
#include "getdef.h"
#include "groupio.h"
#ifdef      SHADOWGRP
#include "sgroupio.h"
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <pwd.h>
#endif                        /* USE_PAM */
static int is_shadow_grp;
#endif

/*
 * exit status values
 */

#define E_SUCCESS 0     /* success */
#define E_USAGE         2     /* invalid command syntax */
#define E_BAD_ARG 3     /* invalid argument to option */
#define E_GID_IN_USE    4     /* gid not unique (when -o not used) */
#define E_NAME_IN_USE   9     /* group name nut unique */
#define E_GRP_UPDATE    10    /* can't update group file */

static char *group_name;
static gid_t group_id;
static char *empty_list = NULL;

static char *Prog;

static int oflg = 0;          /* permit non-unique group ID to be specified with -g */
static int gflg = 0;          /* ID value for the new group */
static int fflg = 0;          /* if group already exists, do nothing and exit(0) */

#ifdef      NDBM
extern int gr_dbm_mode;
extern int sg_dbm_mode;
#endif

/* local function prototypes */
static void usage (void);
static void new_grent (struct group *);

#ifdef SHADOWGRP
static void new_sgent (struct sgrp *);
#endif
static void grp_update (void);
static void find_new_gid (void);
static void check_new_name (void);
static void process_flags (int, char **);
static void close_files (void);
static void open_files (void);
static void fail_exit (int);

/*
 * usage - display usage message and exit
 */

static void usage (void)
{
      fprintf (stderr, _("usage: groupadd [-g gid [-o]] group\n"));
      exit (E_USAGE);
}

/*
 * new_grent - initialize the values in a group file entry
 *
 *    new_grent() takes all of the values that have been entered and fills
 *    in a (struct group) with them.
 */

static void new_grent (struct group *grent)
{
      memzero (grent, sizeof *grent);
      grent->gr_name = group_name;
      grent->gr_passwd = SHADOW_PASSWD_STRING;  /* XXX warning: const */
      grent->gr_gid = group_id;
      grent->gr_mem = &empty_list;
}

#ifdef      SHADOWGRP
/*
 * new_sgent - initialize the values in a shadow group file entry
 *
 *    new_sgent() takes all of the values that have been entered and fills
 *    in a (struct sgrp) with them.
 */

static void new_sgent (struct sgrp *sgent)
{
      memzero (sgent, sizeof *sgent);
      sgent->sg_name = group_name;
      sgent->sg_passwd = "!"; /* XXX warning: const */
      sgent->sg_adm = &empty_list;
      sgent->sg_mem = &empty_list;
}
#endif                        /* SHADOWGRP */

/*
 * grp_update - add new group file entries
 *
 *    grp_update() writes the new records to the group files.
 */

static void grp_update (void)
{
      struct group grp;

#ifdef      SHADOWGRP
      struct sgrp sgrp;
#endif                        /* SHADOWGRP */

      /*
       * Create the initial entries for this new group.
       */

      new_grent (&grp);
#ifdef      SHADOWGRP
      new_sgent (&sgrp);
#endif                        /* SHADOWGRP */

      /*
       * Write out the new group file entry.
       */

      if (!gr_update (&grp)) {
            fprintf (stderr, _("%s: error adding new group entry\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
#ifdef      NDBM

      /*
       * Update the DBM group file with the new entry as well.
       */

      if (gr_dbm_present () && !gr_dbm_update (&grp)) {
            fprintf (stderr, _("%s: cannot add new dbm group entry\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
      endgrent ();
#endif                        /* NDBM */

#ifdef      SHADOWGRP

      /*
       * Write out the new shadow group entries as well.
       */

      if (is_shadow_grp && !sgr_update (&sgrp)) {
            fprintf (stderr, _("%s: error adding new group entry\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
#ifdef      NDBM

      /*
       * Update the DBM group file with the new entry as well.
       */

      if (is_shadow_grp && sg_dbm_present () && !sg_dbm_update (&sgrp)) {
            fprintf (stderr, _("%s: cannot add new dbm group entry\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
      endsgent ();
#endif                        /* NDBM */
#endif                        /* SHADOWGRP */
      SYSLOG ((LOG_INFO, "new group: name=%s, gid=%u",
             group_name, (unsigned int)group_id));
}

/*
 * find_new_gid - find the next available GID
 *
 *    find_new_gid() locates the next highest unused GID in the group
 *    file, or checks the given group ID against the existing ones for
 *    uniqueness.
 */

static void find_new_gid (void)
{
      const struct group *grp;
      gid_t gid_min, gid_max;

      gid_min = getdef_unum ("GID_MIN", 100);
      gid_max = getdef_unum ("GID_MAX", 60000);

      /*
       * Start with some GID value if the user didn't provide us with
       * one already.
       */

      if (!gflg)
            group_id = gid_min;

      /*
       * Search the entire group file, either looking for this GID (if the
       * user specified one with -g) or looking for the largest unused
       * value.
       */

#ifdef NO_GETGRENT
      gr_rewind ();
      while ((grp = gr_next ())) {
#else
      setgrent ();
      while ((grp = getgrent ())) {
#endif
            if (strcmp (group_name, grp->gr_name) == 0) {
                  if (fflg) {
                        fail_exit (E_SUCCESS);
                  }
                  fprintf (stderr, _("%s: name %s is not unique\n"),
                         Prog, group_name);
                  fail_exit (E_NAME_IN_USE);
            }
            if (gflg && group_id == grp->gr_gid) {
                  if (fflg) {
                        /* turn off -g and search again */
                        gflg = 0;
#ifdef NO_GETGRENT
                        gr_rewind ();
#else
                        setgrent ();
#endif
                        continue;
                  }
                  fprintf (stderr, _("%s: gid %u is not unique\n"),
                         Prog, (unsigned int) group_id);
                  fail_exit (E_GID_IN_USE);
            }
            if (!gflg && grp->gr_gid >= group_id) {
                  if (grp->gr_gid > gid_max)
                        continue;
                  group_id = grp->gr_gid + 1;
            }
      }
      if (!gflg && group_id == gid_max + 1) {
            for (group_id = gid_min; group_id < gid_max; group_id++) {
#ifdef NO_GETGRENT
                  gr_rewind ();
                  while ((grp = gr_next ())
                         && grp->gr_gid != group_id);
                  if (!grp)
                        break;
#else
                  if (!getgrgid (group_id))
                        break;
#endif
            }
            if (group_id == gid_max) {
                  fprintf (stderr, _("%s: can't get unique gid\n"),
                         Prog);
                  fail_exit (E_GID_IN_USE);
            }
      }
}

/*
 * check_new_name - check the new name for validity
 *
 *    check_new_name() insures that the new name doesn't contain any
 *    illegal characters.
 */

static void check_new_name (void)
{
      if (check_group_name (group_name))
            return;

      /*
       * All invalid group names land here.
       */

      fprintf (stderr, _("%s: %s is a not a valid group name\n"),
             Prog, group_name);

      exit (E_BAD_ARG);
}

/*
 * process_flags - perform command line argument setting
 *
 *    process_flags() interprets the command line arguments and sets the
 *    values that the user will be created with accordingly. The values
 *    are checked for sanity.
 */

static void process_flags (int argc, char **argv)
{
      char *cp;
      int arg;

      while ((arg = getopt (argc, argv, "og:O:f")) != EOF) {
            switch (arg) {
            case 'g':
                  gflg++;
                  if (!isdigit (optarg[0]))
                        usage ();

                  group_id = strtoul (optarg, &cp, 10);
                  if (*cp != '\0') {
                        fprintf (stderr,
                               _("%s: invalid group %s\n"), Prog,
                               optarg);
                        fail_exit (E_BAD_ARG);
                  }
                  break;
            case 'o':
                  oflg++;
                  break;
            case 'O':
                  /*
                   * override login.defs defaults (-O name=value)
                   * example: -O GID_MIN=100 -O GID_MAX=499
                   * note: -O GID_MIN=10,GID_MAX=499 doesn't work yet
                   */
                  cp = strchr (optarg, '=');
                  if (!cp) {
                        fprintf (stderr,
                               _("%s: -O requires NAME=VALUE\n"),
                               Prog);
                        exit (E_BAD_ARG);
                  }
                  /* terminate name, point to value */
                  *cp++ = '\0';
                  if (putdef_str (optarg, cp) < 0)
                        exit (E_BAD_ARG);
                  break;
            case 'f':
                  /*
                   * "force" - do nothing, just exit(0), if the
                   * specified group already exists. With -g, if
                   * specified gid already exists, choose another
                   * (unique) gid (turn off -g). Based on the RedHat's
                   * patch from shadow-utils-970616-9.
                   */
                  fflg++;
                  break;
            default:
                  usage ();
            }
      }

      if (oflg && !gflg)
            usage ();

      if (optind != argc - 1)
            usage ();

      group_name = argv[argc - 1];
      check_new_name ();
}

/*
 * close_files - close all of the files that were opened
 *
 *    close_files() closes all of the files that were opened for this new
 *    group. This causes any modified entries to be written out.
 */

static void close_files (void)
{
      if (!gr_close ()) {
            fprintf (stderr, _("%s: cannot rewrite group file\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
      gr_unlock ();
#ifdef      SHADOWGRP
      if (is_shadow_grp && !sgr_close ()) {
            fprintf (stderr,
                   _("%s: cannot rewrite shadow group file\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
      if (is_shadow_grp)
            sgr_unlock ();
#endif                        /* SHADOWGRP */
}

/*
 * open_files - lock and open the group files
 *
 *    open_files() opens the two group files.
 */

static void open_files (void)
{
      if (!gr_lock ()) {
            fprintf (stderr, _("%s: unable to lock group file\n"),
                   Prog);
            exit (E_GRP_UPDATE);
      }
      if (!gr_open (O_RDWR)) {
            fprintf (stderr, _("%s: unable to open group file\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
#ifdef      SHADOWGRP
      if (is_shadow_grp && !sgr_lock ()) {
            fprintf (stderr,
                   _("%s: unable to lock shadow group file\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
      if (is_shadow_grp && !sgr_open (O_RDWR)) {
            fprintf (stderr,
                   _("%s: unable to open shadow group file\n"),
                   Prog);
            fail_exit (E_GRP_UPDATE);
      }
#endif                        /* SHADOWGRP */
}

/*
 * fail_exit - exit with an error code after unlocking files
 */

static void fail_exit (int code)
{
      (void) gr_unlock ();
#ifdef      SHADOWGRP
      if (is_shadow_grp)
            sgr_unlock ();
#endif
      exit (code);
}

#ifdef USE_PAM
static struct pam_conv conv = {
      misc_conv,
      NULL
};
#endif                        /* USE_PAM */

/*
 * main - groupadd command
 */

int main (int argc, char **argv)
{
#ifdef USE_PAM
      pam_handle_t *pamh = NULL;
      struct passwd *pampw;
      int retval;
#endif

      /*
       * Get my name so that I can use it to report errors.
       */

      Prog = Basename (argv[0]);

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

#ifdef USE_PAM
      retval = PAM_SUCCESS;

      pampw = getpwuid (getuid ());
      if (pampw == NULL) {
            retval = PAM_USER_UNKNOWN;
      }

      if (retval == PAM_SUCCESS) {
            retval =
                pam_start ("shadow", pampw->pw_name, &conv, &pamh);
      }

      if (retval == PAM_SUCCESS) {
            retval = pam_authenticate (pamh, 0);
            if (retval != PAM_SUCCESS) {
                  pam_end (pamh, retval);
            }
      }

      if (retval == PAM_SUCCESS) {
            retval = pam_acct_mgmt (pamh, 0);
            if (retval != PAM_SUCCESS) {
                  pam_end (pamh, retval);
            }
      }

      if (retval != PAM_SUCCESS) {
            fprintf (stderr, _("%s: PAM authentication failed\n"),
                   Prog);
            exit (1);
      }
#endif                        /* USE_PAM */

      OPENLOG (Prog);

#ifdef SHADOWGRP
      is_shadow_grp = sgr_file_present ();
#endif

      /*
       * The open routines for the DBM files don't use read-write as the
       * mode, so we have to clue them in.
       */

#ifdef      NDBM
      gr_dbm_mode = O_RDWR;
#ifdef      SHADOWGRP
      sg_dbm_mode = O_RDWR;
#endif                        /* SHADOWGRP */
#endif                        /* NDBM */
      process_flags (argc, argv);

      /*
       * Start with a quick check to see if the group exists.
       */

      if (getgrnam (group_name)) {
            if (fflg) {
                  exit (E_SUCCESS);
            }
            fprintf (stderr, _("%s: group %s exists\n"), Prog,
                   group_name);
            exit (E_NAME_IN_USE);
      }

      /*
       * Do the hard stuff - open the files, create the group entries,
       * then close and update the files.
       */

      open_files ();

      if (!gflg || !oflg)
            find_new_gid ();

      grp_update ();

      close_files ();

#ifdef USE_PAM
      if (retval == PAM_SUCCESS) {
            retval = pam_chauthtok (pamh, 0);
            if (retval != PAM_SUCCESS) {
                  pam_end (pamh, retval);
            }
      }

      if (retval != PAM_SUCCESS) {
            fprintf (stderr, _("%s: PAM chauthtok failed\n"), Prog);
            exit (1);
      }

      if (retval == PAM_SUCCESS)
            pam_end (pamh, PAM_SUCCESS);
#endif                        /* USE_PAM */
      exit (E_SUCCESS);
 /*NOTREACHED*/}

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