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- /*
- * Copyright 1990, John F. Haugh II
- * All rights reserved.
- *
- * Use, duplication, and disclosure prohibited without
- * the express written permission of the author.
- *
- * 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 <stdio.h>
- #include <pwd.h>
- #include <grp.h>
- #include <fcntl.h>
- #include <string.h>
- #include "config.h"
- #ifdef SHADOWPWD
- #include "shadow.h"
- #endif
-
- #ifndef lint
- static char sccsid[] = "@(#)newusers.c 3.1 22:33:23 11/16/90";
- #endif
-
- char *Prog;
-
- extern char *pw_encrypt();
-
- int pw_lock(), gr_lock();
- int pw_open(), gr_open();
- struct passwd *pw_locate(), *pw_next();
- struct group *gr_locate(), *gr_next();
- int pw_update(), gr_update();
- int pw_close(), gr_close();
- int pw_unlock(), gr_unlock();
-
- #ifdef SHADOWPWD
- int spw_lock(), spw_open(), spw_update(), spw_close(), spw_unlock();
- struct spwd *spw_locate(), *spw_next();
- #endif
-
- #ifndef MKDIR
-
- /*
- * mkdir - for those of us with no mkdir() system call.
- */
-
- mkdir (dir, mode)
- char *dir;
- int mode;
- {
- int mask;
- int status;
- int pid;
- int i;
- char buf[BUFSIZ];
-
- mode = (~mode & 0777);
- mask = umask (mode);
- if ((pid = fork ()) == 0) {
- execl ("/bin/mkdir", "mkdir", dir, (char *) 0);
- perror ("/bin/mkdir");
- _exit (1);
- } else {
- while ((i = wait (&status)) != pid && i != -1)
- ;
- }
- umask (mask);
- return status;
- }
- #endif
-
- /*
- * usage - display usage message and exit
- */
-
- usage ()
- {
- fprintf (stderr, "Usage: %s [ input ]\n", Prog);
- exit (1);
- }
-
- /*
- * add_group - create a new group or add a user to an existing group
- */
-
- int
- add_group (name, uid, gid, ngid)
- char *name;
- char *uid;
- char *gid;
- int *ngid;
- {
- struct passwd *pwd;
- 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;
-
- if (! (grent.gr_mem = (char **)
- malloc (sizeof (char *) * (i + 2)))) {
- fprintf (stderr, "%s: Out of Memory\n", Prog);
- return -1;
- }
- memcpy (grent.gr_mem, grp->gr_mem, sizeof (char *) * (i + 2));
- grent.gr_mem[i] = strdup (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 = gid;
- else
- grent.gr_name = name;
-
- grent.gr_passwd = "!";
- grent.gr_gid = i;
- members[0] = name;
- members[1] = (char *) 0;
- grent.gr_mem = members;
-
- *ngid = grent.gr_gid;
- return ! gr_update (&grent);
- }
-
- /*
- * add_user - create a new user ID
- */
-
- add_user (name, uid, nuid, gid)
- char *name;
- char *uid;
- int *nuid;
- int gid;
- {
- struct passwd *pwd;
- struct passwd pwent;
- int 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);
- } 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 = name;
- pwent.pw_passwd = "!";
- pwent.pw_age = "";
- pwent.pw_uid = i;
- pwent.pw_gid = gid;
- pwent.pw_gecos = "";
- pwent.pw_dir = "";
- pwent.pw_shell = "";
-
- *nuid = i;
- return ! pw_update (&pwent);
- }
-
- /*
- * add_passwd - add or update the encrypted password
- */
-
- add_passwd (pwd, passwd)
- struct passwd *pwd;
- char *passwd;
- {
- #ifdef SHADOWPWD
- struct spwd *sp;
- struct spwd spent;
- #endif
- struct passwd *pw;
- struct passwd pwent;
- static char newage[5];
-
- /*
- * 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 ...
- */
-
- #ifndef SHADOWPWD
- pwd->pw_passwd = pw_encrypt (passwd, (char *) 0);
- if (strlen (pwd->pw_age) == 4) {
- strcpy (newage, pwd->pw_age);
- strcpy (newage + 2,
- l64a (time ((long *) 0) / (7L*24L*3600L)));
- pwd->pw_age = newage;
- }
- return 0;
- #else
-
- /*
- * 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, (char *) 0);
- return ! spw_update (sp);
- }
-
- /*
- * Pick the next easiest case - the user has an encrypted
- * password which isn't equal to "!". The password was set
- * to "!" earlier when the entry was created, so this user
- * would have to have had the password set someplace else.
- */
-
- if (strcmp (pwd->pw_passwd, "!") != 0) {
- pwd->pw_passwd = pw_encrypt (passwd, (char *) 0);
- if (strlen (pwd->pw_age) == 4) {
- strcpy (newage, pwd->pw_age);
- strcpy (newage + 2,
- l64a (time ((long *) 0) / (7L*24L*3600L)));
- pwd->pw_age = newage;
- }
- return 0;
- }
-
- /*
- * Now the really hard case - I need to create an entirely
- * shadow password file entry.
- */
-
- spent.sp_namp = pwd->pw_name;
- spent.sp_pwdp = pw_encrypt (passwd, (char *) 0);
- spent.sp_lstchg = time ((long *) 0) / (24L*3600L);
- #ifdef MINDAYS
- spent.sp_min = MINDAYS;
- #else
- spent.sp_min = 0;
- #endif
- #ifdef MAXDAYS
- spent.sp_max = MAXDAYS;
- #else
- spent.sp_max = 10000; /* 10000 is infinity this week */
- #endif
- #ifdef WARNAGE
- spent.sp_warn = WARNAGE;
- #else
- spent.sp_warn = -1;
- #endif
- spent.sp_inact = -1;
- spent.sp_expire = -1;
- spent.sp_flag = -1;
-
- return ! spw_update (&spent);
- #endif
- }
-
- main (argc, argv)
- int argc;
- char **argv;
- {
- char buf[BUFSIZ];
- char *fields[8];
- int nfields;
- char *name;
- char *newpwd;
- char *cp;
- #ifdef SHADOWPWD
- struct spwd *sp;
- struct spwd newsp;
- struct spwd *spw_locate();
- #endif
- struct passwd *pw;
- struct passwd newpw;
- struct passwd *pw_locate();
- char newage[5];
- int errors = 0;
- int line = 0;
- long now = time ((long *) 0) / (24L*3600L);
- int uid;
- int gid;
- int i;
-
- if (Prog = strrchr (argv[0], '/'))
- Prog++;
- else
- Prog = argv[0];
-
- if (argc > 1 && argv[1][0] == '-')
- usage ();
-
- if (argc == 2) {
- if (! freopen (argv[1], "r", stdin)) {
- sprintf (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.
- */
-
- for (i = 0;i < 30;i++) {
- if (pw_lock ())
- break;
- }
- if (i == 30) {
- fprintf (stderr, "%s: can't lock /etc/passwd.\n", Prog);
- exit (1);
- }
- #ifdef SHADOWPWD
- if (! 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
- (void) spw_unlock ();
- #endif
- exit (1);
- }
- #ifdef SHADOWPWD
- if (! pw_open (O_RDWR) || ! 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
- (void) 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 (*cp || 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[2], fields[3], &gid)) {
- fprintf (stderr, "%s: %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, 0)) {
- #ifdef UMASK
- if (mkdir (newpw.pw_dir, 0777 & (~UMASK)))
- #else
- if (mkdir (newpw.pw_dir, 0777))
- #endif
- 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 ("%s: error detected, changes ignored\n", Prog);
- (void) gr_unlock ();
- #ifdef SHADOWPWD
- (void) spw_unlock ();
- #endif
- (void) pw_unlock ();
- exit (1);
- }
- #ifdef SHADOWPWD
- if (! pw_close () || ! spw_close () || ! gr_close ())
- #else
- if (! pw_close () || ! gr_close ())
- #endif
- {
- fprintf ("%s: error updating files\n", Prog);
- (void) gr_unlock ();
- #ifdef SHADOWPWD
- (void) spw_unlock ();
- #endif
- (void) pw_unlock ();
- exit (1);
- }
- (void) gr_unlock ();
- #ifdef SHADOWPWD
- (void) spw_unlock ();
- #endif
- (void) pw_unlock ();
-
- exit (0);
- }
-