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+/****
+** 04/21/96
+** hacked even more, replaced gets() with something slightly harder to buffer
+** overflow. Added support for setting a default quota on new account, with
+** edquota -p. Other cleanups for security, I let some users run adduser suid
+** root to add new accounts. (overflow checks, clobber environment, valid
+** shell checks, restrictions on gid + home dir settings).
+
+** Added max. username length. Used syslog() a bit for important events.
+** Support to immediately expire account with passwd -e.
+
+** Called it version 2.0! Because I felt like it!
+
+** -- Chris, chris@ferret.lmh.ox.ac.uk
+
+** 03/17/96
+** hacked a bit more, removed unused code, cleaned up for gcc -Wall.
+** --marekm
+**
+** 02/26/96
+** modified to call shadow utils (useradd,chage,passwd) on shadowed
+** systems - Cristian Gafton, gafton@sorosis.ro
+**
+** 6/27/95
+** shadow-adduser 1.4:
+**
+** now it copies the /etc/skel dir into the person's dir,
+** makes the mail folders, changed some defaults and made a 'make
+** install' just for the hell of it.
+**
+** Greg Gallagher
+** CIN.Net
+**
+** 1/28/95
+** shadow-adduser 1.3:
+**
+** Basically a bug-fix on my additions in 1.2. Thanks to Terry Stewart
+** (stew@texas.net) for pointing out one of the many idiotic bugs I introduced.
+** It was such a stupid bug that I would have never seen it myself.
+**
+** Brandon
+*****
+** 01/27/95
+**
+** shadow-adduser 1.2:
+** I took the C source from adduser-shadow (credits are below) and made
+** it a little more worthwhile. Many small changes... Here's
+** the ones I can remember:
+**
+** Removed support for non-shadowed systems (if you don't have shadow,
+** use the original adduser, don't get this shadow version!)
+** Added support for the correct /etc/shadow fields (Min days before
+** password change, max days before password change, Warning days,
+** and how many days from expiry date does the account go invalid)
+** The previous version just left all of those fields blank.
+** There is still one field left (expiry date for the account, period)
+** which I have left blank because I do not use it and didn't want to
+** spend any more time on this. I'm sure someone will put it in and
+** tack another plethora of credits on here. :)
+** Added in the password date field, which should always reflect the last
+** date the password was changed, for expiry purposes. "passwd" always
+** updates this field, so the adduser program should set it up right
+** initially (or a user could keep thier initial password forever ;)
+** The number is in days since Jan 1st, 1970.
+**
+** Have fun with it, and someone please make
+** a real version(this is still just a hack)
+** for us all to use (and Email it to me???)
+**
+** Brandon
+** photon@usis.com
+**
+*****
+** adduser 1.0: add a new user account (For systems not using shadow)
+** With a nice little interface and a will to do all the work for you.
+**
+** Craig Hagan
+** hagan@opine.cs.umass.edu
+**
+** Modified to really work, look clean, and find unused uid by Chris Cappuccio
+** chris@slinky.cs.umass.edu
+**
+*****
+**
+** 01/19/95
+**
+** FURTHER modifications to enable shadow passwd support (kludged, but
+** no more so than the original) by Dan Crowson - dcrowson@mo.net
+**
+** Search on DAN for all changes...
+**
+*****
+**
+** cc -O -o adduser adduser.c
+** Use gcc if you have it... (political reasons beyond my control) (chris)
+**
+** I've gotten this program to work with success under Linux (without
+** shadow) and SunOS 4.1.3. I would assume it should work pretty well
+** on any system that uses no shadow. (chris)
+**
+** If you have no crypt() then try
+** cc -DNO_CRYPT -O -o adduser adduser.c xfdes.c
+** I'm not sure how login operates with no crypt()... I guess
+** the same way we're doing it here.
+*/
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <pwd.h>
+#include <grp.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/timeb.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <syslog.h>
+
+#define IMMEDIATE_CHANGE /* Expire newly created password, must be changed
+ * immediately upon next login */
+#define HAVE_QUOTAS /* Obvious */
+#define EXPIRE_VALS_SET /* If defined, 'normal' users can't change
+ * password expiry values (if running suid root) */
+
+#define HAVE_GETUSERSHELL /* FIXME: Isn't this defined in config.h too? */
+#define LOGGING /* If we want to log various things to syslog */
+#define MAX_USRNAME 8 /* Longer usernames seem to work on my system....
+ * But they're probably a poor idea */
+
+
+#define DEFAULT_SHELL "/bin/bash" /* because BASH is your friend */
+#define DEFAULT_HOME "/home"
+#define USERADD_PATH "/usr/sbin/useradd"
+#define CHAGE_PATH "/usr/bin/chage"
+#define PASSWD_PATH "/usr/bin/passwd"
+#define EDQUOTA_PATH "/usr/sbin/edquota"
+#define QUOTA_DEFAULT "defuser"
+#define DEFAULT_GROUP 100
+
+#define DEFAULT_MIN_PASS 0
+#define DEFAULT_MAX_PASS 100
+#define DEFAULT_WARN_PASS 14
+#define DEFAULT_USER_DIE 366
+
+void safeget (char *, int);
+
+void
+main (void)
+{
+ char foo[32];
+ char usrname[32], person[32], dir[32], shell[32];
+ unsigned int group, min_pass, max_pass, warn_pass, user_die;
+ /* the group and uid of the new user */
+ int bad = 0, done = 0, correct = 0, olduid;
+ char cmd[255];
+ struct group *grp;
+
+ /* flags, in order:
+ * bad to see if the username is in /etc/passwd, or if strange stuff has
+ * been typed if the user might be put in group 0
+ * done allows the program to exit when a user has been added
+ * correct loops until a username is found that isn't in /etc/passwd
+ */
+
+ /* The real program starts HERE! */
+
+ if (geteuid () != 0)
+ {
+ printf ("It seems you don't have access to add a new user. Try\n");
+ printf ("logging in as root or su root to gain superuser access.\n");
+ exit (1);
+ }
+
+ /* Sanity checks
+ */
+
+#ifdef LOGGING
+ openlog ("adduser", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
+ syslog (LOG_INFO, "invoked by user %s\n", getpwuid (getuid ())->pw_name);
+#endif
+
+ if (!(grp = getgrgid (DEFAULT_GROUP)))
+ {
+ printf ("Error: the default group %d does not exist on this system!\n",
+ DEFAULT_GROUP);
+ printf ("adduser must be recompiled.\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "warning: failed. no such default group\n");
+ closelog ();
+#endif
+ exit (1);
+ };
+
+ while (!correct)
+ { /* loop until a "good" usrname is chosen */
+ while (!done)
+ {
+ printf ("\nLogin to add (^C to quit): ");
+ fflush (stdout);
+
+ safeget (usrname, sizeof (usrname));
+
+ if (!strlen (usrname))
+ {
+ printf ("Empty input.\n");
+ done = 0;
+ continue;
+ };
+
+ /* what I saw here before made me think maybe I was running DOS */
+ /* might this be a solution? (chris) */
+ if (strlen (usrname) > MAX_USRNAME)
+ {
+ printf ("That name is longer than the maximum of %d characters. Choose another.\n", MAX_USRNAME);
+ done = 0;
+ }
+ else if (getpwnam (usrname) != NULL)
+ {
+ printf ("That name is in use, choose another.\n");
+ done = 0;
+ }
+ else if (strchr (usrname, ' ') != NULL)
+ {
+ printf ("No spaces in username!!\n");
+ done = 0;
+ }
+ else
+ done = 1;
+ }; /* done, we have a valid new user name */
+
+ /* all set, get the rest of the stuff */
+ printf ("\nEditing information for new user [%s]\n", usrname);
+
+ printf ("\nFull Name [%s]: ", usrname);
+ fflush (stdout);
+ safeget (person, sizeof (person));
+ if (!strlen (person))
+ {
+ bzero (person, sizeof (person));
+ strcpy (person, usrname);
+ };
+
+ if (getuid () == 0)
+ {
+ do
+ {
+ bad = 0;
+ printf ("GID [%d]: ", DEFAULT_GROUP);
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+ if (!strlen (foo))
+ group = DEFAULT_GROUP;
+ else if (isdigit (*foo))
+ {
+ group = atoi (foo);
+ if (!(grp = getgrgid (group)))
+ {
+ printf ("unknown gid %s\n", foo);
+ group = DEFAULT_GROUP;
+ bad = 1;
+ };
+ }
+ else if ((grp = getgrnam (foo)))
+ group = grp->gr_gid;
+ else
+ {
+ printf ("unknown group %s\n", foo);
+ group = DEFAULT_GROUP;
+ bad = 1;
+ }
+ if (group == 0)
+ { /* You're not allowed to make root group users! */
+ printf ("Creation of root group users not allowed (must be done by hand)\n");
+ group = DEFAULT_GROUP;
+ bad = 1;
+ };
+ }
+ while (bad);
+ }
+ else
+ {
+ printf ("Group will be default of: %d\n", DEFAULT_GROUP);
+ group = DEFAULT_GROUP;
+ }
+
+ if (getuid () == 0)
+ {
+ printf ("\nIf home dir ends with a / then '%s' will be appended to it\n", usrname);
+ printf ("Home Directory [%s/%s]: ", DEFAULT_HOME, usrname);
+ fflush (stdout);
+ safeget (dir, sizeof (dir));
+ if (!strlen (dir))
+ { /* hit return */
+ sprintf (dir, "%s/%s", DEFAULT_HOME, usrname);
+ }
+ else if (dir[strlen (dir) - 1] == '/')
+ sprintf (dir+strlen(dir), "%s", usrname);
+ }
+ else
+ {
+ printf ("\nHome directory will be %s/%s\n", DEFAULT_HOME, usrname);
+ sprintf (dir, "%s/%s", DEFAULT_HOME, usrname);
+ }
+
+ printf ("\nShell [%s]: ", DEFAULT_SHELL);
+ fflush (stdout);
+ safeget (shell, sizeof (shell));
+ if (!strlen (shell))
+ sprintf (shell, "%s", DEFAULT_SHELL);
+ else
+ {
+ char *sh;
+ int ok = 0;
+#ifdef HAVE_GETUSERSHELL
+ setusershell ();
+ while ((sh = getusershell ()) != NULL)
+ if (!strcmp (shell, sh))
+ ok = 1;
+ endusershell ();
+#endif
+ if (!ok)
+ {
+ if (getuid () == 0)
+ printf ("Warning: root allowed non standard shell\n");
+ else
+ {
+ printf ("Shell NOT in /etc/shells, DEFAULT used\n");
+ sprintf (shell, "%s", DEFAULT_SHELL);
+ }
+ }
+ }
+
+#ifdef EXPIRE_VALS_SET
+ if (getuid () == 0)
+ {
+#endif
+ printf ("\nMin. Password Change Days [%d]: ", DEFAULT_MIN_PASS);
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+ if (strlen (foo) > 1)
+ min_pass = DEFAULT_MIN_PASS;
+ else
+ min_pass = atoi (foo);
+
+ printf ("Max. Password Change Days [%d]: ", DEFAULT_MAX_PASS);
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+ if (strlen (foo) > 1)
+ max_pass = atoi (foo);
+ else
+ max_pass = DEFAULT_MAX_PASS;
+
+ printf ("Password Warning Days [%d]: ", DEFAULT_WARN_PASS);
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+ warn_pass = atoi (foo);
+ if (warn_pass == 0)
+
+ warn_pass = DEFAULT_WARN_PASS;
+
+ printf ("Days after Password Expiry for Account Locking [%d]: ", DEFAULT_USER_DIE);
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+ user_die = atoi (foo);
+ if (user_die == 0)
+ user_die = DEFAULT_USER_DIE;
+
+#ifdef EXPIRE_VALS_SET
+ }
+ else
+ {
+ printf ("\nSorry, account expiry values are set.\n");
+ user_die = DEFAULT_USER_DIE;
+ warn_pass = DEFAULT_WARN_PASS;
+ max_pass = DEFAULT_MAX_PASS;
+ min_pass = DEFAULT_MIN_PASS;
+ }
+#endif
+
+ printf ("\nInformation for new user [%s] [%s]:\n", usrname, person);
+ printf ("Home directory: [%s] Shell: [%s]\n", dir, shell);
+ printf ("GID: [%d]\n", group);
+ printf ("MinPass: [%d] MaxPass: [%d] WarnPass: [%d] UserExpire: [%d]\n",
+ min_pass, max_pass, warn_pass, user_die);
+ printf ("\nIs this correct? [y/N]: ");
+ fflush (stdout);
+ safeget (foo, sizeof (foo));
+
+ done = bad = correct = (foo[0] == 'y' || foo[0] == 'Y');
+
+ if (bad != 1)
+ printf ("\nUser [%s] not added\n", usrname);
+ }
+
+ /* Clobber the environment, I run this suid root sometimes to let
+ * non root privileged accounts add users --chris */
+
+ *environ = NULL;
+
+ bzero (cmd, sizeof (cmd));
+ sprintf (cmd, "%s -g %d -d %s -s %s -c \"%s\" -m -k /etc/skel %s",
+ USERADD_PATH, group, dir, shell, person, usrname);
+ printf ("Calling useradd to add new user:\n%s\n", cmd);
+ if (system (cmd))
+ {
+ printf ("User add failed!\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "could not add new user\n");
+ closelog ();
+#endif
+ exit (errno);
+ };
+
+ olduid = getuid (); /* chage, passwd, edquota etc. require ruid = root
+ */
+ setuid (0);
+
+ bzero (cmd, sizeof (cmd));
+
+ /* Chage runs suid root. => we need ruid root to run it with
+ * anything other than chage -l
+ */
+
+ sprintf (cmd, "%s -m %d -M %d -W %d -I %d %s", CHAGE_PATH,
+ min_pass, max_pass, warn_pass, user_die, usrname);
+ printf ("%s\n", cmd);
+ if (system (cmd))
+ {
+ printf ("There was an error setting password expire values\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "password expire values could not be set\n");
+#endif
+ };
+
+ /* I want to add a user completely with one easy command --chris */
+
+#ifdef HAVE_QUOTAS
+ bzero (cmd, sizeof (cmd));
+ sprintf (cmd, "%s -p %s -u %s", EDQUOTA_PATH, QUOTA_DEFAULT, usrname);
+ printf ("%s\n", cmd);
+ if (system (cmd))
+ {
+ printf ("\nWarning: error setting quota\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "warning: account created but NO quotas set!\n");
+#endif /* LOGGING */
+ }
+ else
+ printf ("\nDefault quota set.\n");
+#endif /* HAVE_QUOTAS */
+
+ bzero (cmd, sizeof (cmd));
+ sprintf (cmd, "%s %s", PASSWD_PATH, usrname);
+ if (system (cmd))
+ {
+ printf ("\nWarning: error setting password\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "warning: password set failed!\n");
+#endif
+ }
+#ifdef IMMEDIATE_CHANGE
+ bzero (cmd, sizeof (cmd));
+ sprintf (cmd, "%s -e %s", PASSWD_PATH, usrname);
+ if (system (cmd))
+ {
+ printf ("\nWarning: error expiring password\n");
+#ifdef LOGGING
+ syslog (LOG_ERR, "warning: password expire failed!\n");
+#endif /* LOGGING */
+ }
+#endif /* IMMEDIATE_CHANGE */
+
+ setuid (olduid);
+
+#ifdef LOGGING
+ closelog ();
+#endif
+
+ printf ("\nDone.\n");
+}
+
+void
+safeget (char *buf, int maxlen)
+{
+ int c, i = 0, bad = 0;
+ char *bstart = buf;
+ while ((c = getc (stdin)) != EOF && (c != '\n') && (++i < maxlen))
+ {
+ bad = (!isalnum (c) && (c != '_') && (c != ' '));
+ *(buf++) = (char) c;
+ }
+ *buf = '\0';
+
+ if (bad)
+ {
+ printf ("\nString contained banned character. Please stick to alphanumerics.\n");
+ *bstart = '\0';
+ }
+}
+
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