mirror of
https://github.com/sheumann/hush.git
synced 2024-08-15 02:29:00 +00:00
320 lines
7.2 KiB
C
320 lines
7.2 KiB
C
/* 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
|
|
*
|
|
*/
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE
|
|
#endif
|
|
#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 <getopt.h>
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include "busybox.h"
|
|
|
|
|
|
|
|
/* 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";
|
|
|
|
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
|
|
/* 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 = bb_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;
|
|
}
|
|
}
|
|
|
|
if (p->pw_gid == 0) {
|
|
/* 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 create new gid always = uid */
|
|
p->pw_gid = p->pw_uid;
|
|
}
|
|
|
|
/* EDR bounds check */
|
|
if ((p->pw_uid > max) || (p->pw_uid < min))
|
|
return 2;
|
|
|
|
/* return 1; */
|
|
return 0;
|
|
}
|
|
|
|
static void addgroup_wrapper(const char *login, gid_t gid)
|
|
{
|
|
char *cmd;
|
|
|
|
bb_xasprintf(&cmd, "addgroup -g %d %s", gid, login);
|
|
system(cmd);
|
|
free(cmd);
|
|
}
|
|
|
|
static void passwd_wrapper(const char *login) __attribute__ ((noreturn));
|
|
|
|
static void passwd_wrapper(const char *login)
|
|
{
|
|
static const char prog[] = "passwd";
|
|
execlp(prog, prog, login, NULL);
|
|
bb_error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
|
|
}
|
|
|
|
/* putpwent(3) remix */
|
|
static int adduser(const char *filename, struct passwd *p, int makehome, int setpass)
|
|
{
|
|
FILE *passwd;
|
|
int r;
|
|
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
|
|
FILE *shadow;
|
|
struct spwd *sp;
|
|
#endif
|
|
int new_group = 1;
|
|
|
|
/* if using a pre-existing group, don't create one */
|
|
if (p->pw_gid != 0)
|
|
new_group = 0;
|
|
|
|
/* make sure everything is kosher and setup uid && gid */
|
|
passwd = bb_wfopen(filename, "a");
|
|
if (passwd == NULL) {
|
|
return 1;
|
|
}
|
|
fseek(passwd, 0, SEEK_END);
|
|
|
|
/* if (passwd_study(filename, p) == 0) { */
|
|
r = passwd_study(filename, p);
|
|
if (r) {
|
|
if (r == 1)
|
|
bb_error_msg("%s: login already in use", p->pw_name);
|
|
else if (r == 2)
|
|
bb_error_msg("illegal uid or no uids left");
|
|
else if (r == 3)
|
|
bb_error_msg("group name %s already in use", p->pw_name);
|
|
else
|
|
bb_error_msg("generic error.");
|
|
return 1;
|
|
}
|
|
|
|
/* add to passwd */
|
|
if (putpwent(p, passwd) == -1) {
|
|
return 1;
|
|
}
|
|
fclose(passwd);
|
|
|
|
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
|
|
/* add to shadow if necessary */
|
|
if (shadow_enabled) {
|
|
shadow = bb_wfopen(bb_path_shadow_file, "a");
|
|
if (shadow == NULL) {
|
|
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
|
|
|
|
if (new_group) {
|
|
/* 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);
|
|
|
|
if (makehome) {
|
|
/* mkdir */
|
|
if (mkdir(p->pw_dir, 0755)) {
|
|
bb_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)) {
|
|
bb_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)) {
|
|
bb_perror_msg("%s", p->pw_dir);
|
|
}
|
|
}
|
|
|
|
if (setpass) {
|
|
/* interactively set passwd */
|
|
passwd_wrapper(p->pw_name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* return current uid (root is always uid == 0, right?) */
|
|
#ifndef CONFIG_ADDGROUP
|
|
static inline void if_i_am_not_root(void)
|
|
#else
|
|
void if_i_am_not_root(void)
|
|
#endif
|
|
{
|
|
if (geteuid()) {
|
|
bb_error_msg_and_die( "Only root may add a user or group to the system.");
|
|
}
|
|
}
|
|
|
|
#define SETPASS 1
|
|
#define MAKEHOME 4
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct passwd pw;
|
|
const char *login;
|
|
const char *gecos = default_gecos;
|
|
const char *home = NULL;
|
|
const char *shell = DEFAULT_SHELL;
|
|
const char *usegroup = NULL;
|
|
int flags;
|
|
int setpass = 1;
|
|
int makehome = 1;
|
|
|
|
/* init */
|
|
if (argc < 2) {
|
|
bb_show_usage();
|
|
}
|
|
/* get args */
|
|
flags = bb_getopt_ulflags(argc, argv, "h:g:s:G:DSH", &home, &gecos, &shell, &usegroup);
|
|
|
|
if (flags & SETPASS) {
|
|
setpass = 0;
|
|
}
|
|
if (flags & MAKEHOME) {
|
|
makehome = 0;
|
|
}
|
|
|
|
/* got root? */
|
|
if_i_am_not_root();
|
|
|
|
/* get login */
|
|
if (optind >= argc) {
|
|
bb_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(bb_path_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;
|
|
|
|
if (usegroup) {
|
|
/* Add user to a group that already exists */
|
|
struct group *g;
|
|
|
|
g = getgrnam(usegroup);
|
|
if (g == NULL)
|
|
bb_error_msg_and_die("group %s does not exist", usegroup);
|
|
|
|
pw.pw_gid = g->gr_gid;
|
|
}
|
|
|
|
/* grand finale */
|
|
return adduser(bb_path_passwd_file, &pw, makehome, setpass);
|
|
}
|