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-rw-r--r--loginutils/adduser.c352
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diff --git a/loginutils/adduser.c b/loginutils/adduser.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * adduser - add users to /etc/passwd and /etc/shadow
+ *
+ * Copyright (C) 1999 by Lineo, inc. and John Beppu
+ * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "busybox.h"
+#include "pwd.h"
+#include "grp.h"
+
+#define PASSWD_FILE "/etc/passwd"
+#define SHADOW_FILE "/etc/shadow"
+
+
+/* structs __________________________ */
+
+typedef struct {
+ uid_t u;
+ gid_t g;
+} Id;
+
+/* data _____________________________ */
+
+/* defaults : should this be in an external file? */
+static const char default_passwd[] = "x";
+static const char default_gecos[] = "Linux User,,,";
+static const char default_home_prefix[] = "/home";
+static const char default_shell[] = "/bin/sh";
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+
+#include "shadow.h"
+
+/* shadow in use? */
+static int shadow_enabled = 0;
+#endif
+
+/* remix */
+/* EDR recoded such that the uid may be passed in *p */
+static int passwd_study(const char *filename, struct passwd *p)
+{
+ struct passwd *pw;
+ FILE *passwd;
+
+ const int min = 500;
+ const int max = 65000;
+
+ passwd = wfopen(filename, "r");
+ if (!passwd)
+ return 4;
+
+ /* EDR if uid is out of bounds, set to min */
+ if ((p->pw_uid > max) || (p->pw_uid < min))
+ p->pw_uid = min;
+
+ /* stuff to do:
+ * make sure login isn't taken;
+ * find free uid and gid;
+ */
+ while ((pw = fgetpwent(passwd))) {
+ if (strcmp(pw->pw_name, p->pw_name) == 0) {
+ /* return 0; */
+ return 1;
+ }
+ if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
+ && (pw->pw_uid >= min)) {
+ p->pw_uid = pw->pw_uid + 1;
+ }
+ }
+
+ /* EDR check for an already existing gid */
+ while (getgrgid(p->pw_uid) != NULL)
+ p->pw_uid++;
+
+ /* EDR also check for an existing group definition */
+ if (getgrnam(p->pw_name) != NULL)
+ return 3;
+
+ /* EDR bounds check */
+ if ((p->pw_uid > max) || (p->pw_uid < min))
+ return 2;
+
+ /* EDR create new gid always = uid */
+ p->pw_gid = p->pw_uid;
+
+ /* return 1; */
+ return 0;
+}
+
+static void addgroup_wrapper(const char *login, gid_t gid)
+{
+ int argc = 3;
+ const char *argv0_save;
+ char group_id[8];
+ char group_name[32];
+ char *argv[] = { group_name, "-g", group_id };
+
+ argv0_save = applet_name;
+ applet_name = "addgroup";
+ safe_strncpy(group_name, login, 32);
+ sprintf(group_id, "%d", gid);
+ addgroup_main(argc, argv);
+ applet_name = argv0_save;
+}
+
+static void passwd_wrapper(const char *login)
+{
+ static const char prog[] = "passwd";
+ execlp(prog, prog, login, NULL);
+ error_msg_and_die("Failed to execute 'passwd', you must set the password for '%s' manually", login);
+}
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+/*
+ * pwd_to_spwd - create entries for new spwd structure
+ *
+ * pwd_to_spwd() creates a new (struct spwd) containing the
+ * information in the pointed-to (struct passwd).
+ */
+#define DAY (24L*3600L)
+#define WEEK (7*DAY)
+#define SCALE DAY
+static struct spwd *pwd_to_spwd(const struct passwd *pw)
+{
+ static struct spwd sp;
+
+ /*
+ * Nice, easy parts first. The name and passwd map directly
+ * from the old password structure to the new one.
+ */
+ sp.sp_namp = pw->pw_name;
+ sp.sp_pwdp = pw->pw_passwd;
+
+ /*
+ * Defaults used if there is no pw_age information.
+ */
+ sp.sp_min = 0;
+ sp.sp_max = (10000L * DAY) / SCALE;
+ sp.sp_lstchg = time((time_t *) 0) / SCALE;
+
+ /*
+ * These fields have no corresponding information in the password
+ * file. They are set to uninitialized values.
+ */
+ sp.sp_warn = -1;
+ sp.sp_expire = -1;
+ sp.sp_inact = -1;
+ sp.sp_flag = -1;
+
+ return &sp;
+}
+#endif
+
+/* putpwent(3) remix */
+static int adduser(const char *filename, struct passwd *p)
+{
+ FILE *passwd;
+ int r;
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+ FILE *shadow;
+ struct spwd *sp;
+#endif
+
+ /* make sure everything is kosher and setup uid && gid */
+ passwd = wfopen(filename, "a");
+ if (passwd == NULL) {
+ /* return -1; */
+ return 1;
+ }
+ fseek(passwd, 0, SEEK_END);
+
+ /* if (passwd_study(filename, p) == 0) { */
+ r = passwd_study(filename, p);
+ if (r) {
+ if (r == 1)
+ error_msg("%s: login already in use", p->pw_name);
+ else if (r == 2)
+ error_msg("illegal uid or no uids left");
+ else if (r == 3)
+ error_msg("group name %s already in use", p->pw_name);
+ else
+ error_msg("generic error.");
+ /* return -1; */
+ return 1;
+ }
+
+ /* add to passwd */
+ if (putpwent(p, passwd) == -1) {
+ /* return -1; */
+ return 1;
+ }
+ fclose(passwd);
+
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+ /* add to shadow if necessary */
+ if (shadow_enabled) {
+ shadow = wfopen(SHADOW_FILE, "a");
+ if (shadow == NULL) {
+ /* return -1; */
+ return 1;
+ }
+ fseek(shadow, 0, SEEK_END);
+ sp = pwd_to_spwd(p);
+ sp->sp_max = 99999; /* debianish */
+ sp->sp_warn = 7;
+ fprintf(shadow, "%s:!:%ld:%ld:%ld:%ld:::\n",
+ sp->sp_namp, sp->sp_lstchg, sp->sp_min, sp->sp_max,
+ sp->sp_warn);
+ fclose(shadow);
+ }
+#endif
+
+ /* add to group */
+ /* addgroup should be responsible for dealing w/ gshadow */
+ addgroup_wrapper(p->pw_name, p->pw_gid);
+
+ /* Clear the umask for this process so it doesn't
+ * * screw up the permissions on the mkdir and chown. */
+ umask(0);
+
+ /* mkdir */
+ if (mkdir(p->pw_dir, 0755)) {
+ perror_msg("%s", p->pw_dir);
+ }
+ /* Set the owner and group so it is owned by the new user. */
+ if (chown(p->pw_dir, p->pw_uid, p->pw_gid)) {
+ perror_msg("%s", p->pw_dir);
+ }
+ /* Now fix up the permissions to 2755. Can't do it before now
+ * since chown will clear the setgid bit */
+ if (chmod(p->pw_dir, 02755)) {
+ perror_msg("%s", p->pw_dir);
+ }
+ /* interactively set passwd */
+ passwd_wrapper(p->pw_name);
+
+ return 0;
+}
+
+
+/* return current uid (root is always uid == 0, right?) */
+static inline uid_t i_am_not_root(void)
+{
+ return geteuid();
+}
+
+/*
+ * adduser will take a login_name as its first parameter.
+ *
+ * home
+ * shell
+ * gecos
+ *
+ * can be customized via command-line parameters.
+ * ________________________________________________________________________ */
+int adduser_main(int argc, char **argv)
+{
+ int i = 0;
+ char opt;
+ const char *login;
+ const char *gecos;
+ const char *home = NULL;
+ const char *shell;
+
+ struct passwd pw;
+
+ /* init */
+ if (argc < 2) {
+ show_usage();
+ }
+ gecos = default_gecos;
+ shell = default_shell;
+
+ /* get args */
+ while ((opt = getopt (argc, argv, "h:g:s:")) != -1)
+ switch (opt) {
+ case 'h':
+ home = argv[++i];
+ break;
+ case 'g':
+ gecos = argv[++i];
+ break;
+ case 's':
+ shell = argv[++i];
+ break;
+ default:
+ show_usage ();
+ break;
+ }
+
+ /* got root? */
+ if (i_am_not_root()) {
+ error_msg_and_die( "Only root may add a user or group to the system.");
+ }
+
+ /* get login */
+ if (optind >= argc) {
+ error_msg_and_die( "no user specified");
+ }
+ login = argv[optind];
+
+ /* create string for $HOME if not specified already */
+ if (!home) {
+ home = concat_path_file(default_home_prefix, login);
+ }
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+ /* is /etc/shadow in use? */
+ shadow_enabled = (0 == access(SHADOW_FILE, F_OK));
+#endif
+
+ /* create a passwd struct */
+ pw.pw_name = (char *)login;
+ pw.pw_passwd = (char *)default_passwd;
+ pw.pw_uid = 0;
+ pw.pw_gid = 0;
+ pw.pw_gecos = (char *)gecos;
+ pw.pw_dir = (char *)home;
+ pw.pw_shell = (char *)shell;
+
+ /* grand finale */
+ return adduser(PASSWD_FILE, &pw);
+}
+
+/* $Id: adduser.c,v 1.1 2002/06/04 20:45:05 sandman Exp $ */