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deb-mbse/unix/mbuseradd.c
2004-03-16 20:54:51 +00:00

322 lines
8.5 KiB
C

/*****************************************************************************
*
* $Id$
* Purpose ...............: setuid root version of useradd
*
*****************************************************************************
* Copyright (C) 1997-2004
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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, or (at your option) any
* later version.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <syslog.h>
#include "mbuseradd.h"
int execute(char **args, char *in, char *out, char *err)
{
char buf[PATH_MAX];
int i, pid, status = 0, rc = 0;
for (i = 0; i < 16; i++) {
if (args[i])
sprintf(buf, "%s %s", buf, args[i]);
else
break;
}
syslog(LOG_WARNING, "Execute:%s", buf);
fflush(stdout);
fflush(stderr);
if ((pid = fork()) == 0) {
if (in) {
close(0);
if (open(in, O_RDONLY) != 0) {
syslog(LOG_WARNING, "Reopen of stdin to %s failed", in);
_exit(-1);
}
}
if (out) {
close(1);
if (open(out, O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
syslog(LOG_WARNING, "Reopen of stdout to %s failed", out);
_exit(-1);
}
}
if (err) {
close(2);
if (open(err, O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
syslog(LOG_WARNING, "Reopen of stderr to %s failed", err);
_exit(-1);
}
}
rc = execv(args[0],args);
syslog(LOG_WARNING, "Exec \"%s\" returned %d", args[0], rc);
_exit(-1);
}
do {
rc = wait(&status);
} while (((rc > 0) && (rc != pid)) || ((rc == -1) && (errno == EINTR)));
return 0;
}
void makedir(char *path, mode_t mode, uid_t owner, gid_t group)
{
if (mkdir(path, mode) != 0) {
syslog(LOG_WARNING, "Can't create directory %s:%s", path, strerror(errno));
exit(2);
}
if ((chown(path, owner, group)) == -1) {
syslog(LOG_WARNING, "Unable to change ownership of %s", path);
exit(2);
}
}
/*
* Function will create the users name in the passwd file
* Note that this function must run setuid root!
*/
int main(int argc, char *argv[])
{
char *temp, *shell, *homedir, *args[16];
int i;
struct passwd *pwent, *pwuser;
if (argc != 5)
Help();
/*
* First simple check for argument overflow
*/
for (i = 1; i < 5; i++) {
if (strlen(argv[i]) > 80) {
fprintf(stderr, "mbuseradd: Argument %d is too long\n", i);
exit(1);
}
}
memset(args, 0, sizeof(args));
temp = calloc(PATH_MAX, sizeof(char));
shell = calloc(PATH_MAX, sizeof(char));
homedir = calloc(PATH_MAX, sizeof(char));
if (setuid(0) == -1 || setgid(1) == -1) {
perror("");
fprintf(stderr, "mbuseradd: Unable to setuid(root) or setgid(root)\n");
fprintf(stderr, "Make sure that this program is set to -rwsr-sr-x\n");
fprintf(stderr, "Owner must be root and group root\n");
exit(1);
}
umask(0000);
/*
* We don't log into MBSE BBS logfiles but to the system logfiles,
* because we are modifying system files not belonging to MBSE BBS.
*/
openlog("mbuseradd", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
syslog(LOG_WARNING, "mbuseradd %s %s %s %s", argv[1], argv[2], argv[3], argv[4]);
/*
* Build command to add user entry to the /etc/passwd and /etc/shadow
* files. We use the systems own useradd program.
*/
#if defined(__linux__) || defined(__NetBSD__)
if ((access("/usr/bin/useradd", R_OK)) == 0)
args[0] = (char *)"/usr/bin/useradd";
else if ((access("/bin/useradd", R_OK)) == 0)
args[0] = (char *)"/bin/useradd";
else if ((access("/usr/sbin/useradd", R_OK)) == 0)
args[0] = (char *)"/usr/sbin/useradd";
else if ((access("/sbin/useradd", R_OK)) == 0)
args[0] = (char *)"/sbin/useradd";
else {
syslog(LOG_WARNING, "Can't find useradd");
exit(1);
}
#elif __FreeBSD__
if ((access("/usr/sbin/pw", X_OK)) == 0)
args[0] = (char *)"/usr/sbin/pw";
else if ((access("/sbin/pw", X_OK)) == 0)
args[0] = (char *)"/sbin/pw";
else {
syslog(LOG_WARNING, "Can't find pw");
exit(1);
}
#else
syslog(LOG_WARNING, "Don't know how to add a user on this OS");
exit(1);
#endif
sprintf(shell, "%s/bin/mbsebbs", getenv("MBSE_ROOT"));
sprintf(homedir, "%s/%s", argv[4], argv[2]);
#if defined(__linux__) || defined(__NetBSD__)
args[1] = (char *)"-c";
args[2] = argv[3];
args[3] = (char *)"-d";
args[4] = homedir;
args[5] = (char *)"-g";
args[6] = argv[1];
args[7] = (char *)"-s";
args[8] = shell;
args[9] = argv[2];
args[10] = NULL;
#endif
#ifdef __FreeBSD__
args[1] = (char *)"useradd";
args[2] = argv[2];
args[3] = (char *)"-c";
args[4] = argv[3];
args[5] = (char *)"-d";
args[6] = homedir;
args[7] = (char *)"-g";
args[8] = argv[1];
args[9] = (char *)"-s";
args[10] = shell;
args[11] = NULL;
#endif
if (execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty") != 0) {
syslog(LOG_WARNING, "Failed to create unix account");
exit(1);
}
syslog(LOG_WARNING, "Created Unix account");
/*
* Now create directories and files for this user.
*/
if ((pwent = getpwnam((char *)"mbse")) == NULL) {
syslog(LOG_WARNING, "Can't get password entry for \"mbse\"");
exit(2);
}
/*
*
* Check bbs users base home directory
*/
if ((access(argv[4], R_OK)) != 0) {
syslog(LOG_WARNING, "No bbs base homedirectory, creating..");
makedir(argv[4], 0770, pwent->pw_uid, pwent->pw_gid);
}
/*
* Now create users home directory. Check for an existing directory,
* some systems have already created a home directory. If one is found
* it is removed to create a fresh one.
*/
if ((access(homedir, R_OK)) == 0) {
if ((access("/bin/rm", X_OK)) == 0)
args[0] = (char *)"/bin/rm";
else if ((access("/usr/bin/rm", X_OK)) == 0)
args[0] = (char *)"/usr/bin/rm";
else {
syslog(LOG_WARNING, "Can't find rm");
exit(2);
}
args[1] = (char *)"-Rf";
args[2] = homedir;
args[3] = NULL;
i = execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty");
if (i != 0) {
syslog(LOG_WARNING, "Unable remove old home directory");
exit(2);
}
}
/*
* Create users home directory.
*/
if ((pwuser = getpwnam(argv[2])) == NULL) {
syslog(LOG_WARNING, "Can't get passwd entry for %s", argv[2]);
exit(2);
}
makedir(homedir, 0770, pwuser->pw_uid, pwent->pw_gid);
/*
* Create Maildir and subdirs for Qmail.
*/
sprintf(temp, "%s/%s/Maildir", argv[4], argv[2]);
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
sprintf(temp, "%s/%s/Maildir/cur", argv[4], argv[2]);
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
sprintf(temp, "%s/%s/Maildir/new", argv[4], argv[2]);
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
sprintf(temp, "%s/%s/Maildir/tmp", argv[4], argv[2]);
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
#ifdef _VPOPMAIL_PATH
sprintf(temp, "%s/vadduser", _VPOPMAIL_PATH);
args[0] = temp;
args[1] = argv[2];
args[2] = argv[2];
args[3] = NULL;
if (execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty") != 0) {
syslog(LOG_WARNING, "Failed to create vpopmail account");
} else {
syslog(LOG_WARNING, "Created vpopmail account");
}
#endif
free(shell);
free(temp);
free(homedir);
syslog(LOG_WARNING, "Added system account for user\"%s\"", argv[2]);
exit(0);
}
void Help()
{
fprintf(stderr, "\nmbuseradd commandline:\n\n");
fprintf(stderr, "mbuseradd [gid] [name] [comment] [usersdir]\n");
exit(1);
}