485 lines
12 KiB
C
485 lines
12 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: setuid root version of useradd
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*
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*****************************************************************************
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* Copyright (C) 1997-2005
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <grp.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <sys/param.h>
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#include <syslog.h>
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#include <time.h>
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#if defined(__OpenBSD__)
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#include <sys/sysctl.h>
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#endif
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#include "xmalloc.h"
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#include "mbuseradd.h"
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/*
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* Milliseconds timer, returns 0 on success.
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*/
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int msleep(int msecs)
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{
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int rc;
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struct timespec req, rem;
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rem.tv_sec = 0;
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rem.tv_nsec = 0;
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req.tv_sec = msecs / 1000;
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req.tv_nsec = (msecs % 1000) * 1000000;
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while (1) {
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rc = nanosleep(&req, &rem);
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if (rc == 0)
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break;
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if ((errno == EINVAL) || (errno == EFAULT))
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break;
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/*
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* Error was EINTR, run timer again to complete.
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*/
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req.tv_sec = rem.tv_sec;
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req.tv_nsec = rem.tv_nsec;
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rem.tv_sec = 0;
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rem.tv_nsec = 0;
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}
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return rc;
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}
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int execute(char **args, char *in, char *out, char *err)
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{
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char buf[PATH_MAX];
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int i, pid, status = 0, rc = 0;
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memset(&buf, 0, sizeof(buf));
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for (i = 0; i < 16; i++) {
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if (args[i])
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snprintf(buf + strlen(buf), PATH_MAX - strlen(buf), " %s", args[i]);
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else
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break;
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}
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syslog(LOG_WARNING, "Execute:%s", buf);
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fflush(stdout);
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fflush(stderr);
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if ((pid = fork()) == 0) {
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msleep(150);
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if (in) {
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close(0);
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if (open(in, O_RDONLY) != 0) {
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syslog(LOG_WARNING, "Reopen of stdin to %s failed", in);
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_exit(-1);
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}
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}
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if (out) {
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close(1);
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if (open(out, O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
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syslog(LOG_WARNING, "Reopen of stdout to %s failed", out);
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_exit(-1);
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}
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}
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if (err) {
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close(2);
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if (open(err, O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
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syslog(LOG_WARNING, "Reopen of stderr to %s failed", err);
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_exit(-1);
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}
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}
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rc = execv(args[0],args);
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syslog(LOG_WARNING, "Exec \"%s\" returned %d", args[0], rc);
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_exit(-1);
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}
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do {
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rc = wait(&status);
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} while (((rc > 0) && (rc != pid)) || ((rc == -1) && (errno == EINTR)));
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return 0;
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}
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void makedir(char *path, mode_t mode, uid_t owner, gid_t group)
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{
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if (mkdir(path, mode) != 0) {
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syslog(LOG_WARNING, "Can't create directory %s:%s", path, strerror(errno));
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exit(2);
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}
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if ((chown(path, owner, group)) == -1) {
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syslog(LOG_WARNING, "Unable to change ownership of %s", path);
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exit(2);
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}
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}
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/*
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* Internal version of basename to make this better portable.
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*/
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char *Basename(char *str)
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{
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char *cp = strrchr(str, '/');
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return cp ? cp+1 : str;
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}
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/*
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* Function will create the users name in the passwd file
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* Note that this function must run setuid root!
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*/
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int main(int argc, char *argv[])
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{
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char *temp, *shell, *homedir, *args[16], *parent;
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int i;
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struct passwd *pwent, *pwuser;
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struct group *gr;
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pid_t ppid;
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#if defined(__OpenBSD__)
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#define ARG_SIZE 60
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static char **s, buf[ARG_SIZE];
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size_t siz = 100;
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char **p;
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int mib[4];
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#else
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FILE *fp;
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#endif
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if (argc != 5)
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Help();
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/*
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* First simple check for argument overflow
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*/
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for (i = 1; i < 5; i++) {
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if (strlen(argv[i]) > 80) {
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fprintf(stderr, "mbuseradd: Argument %d is too long\n", i);
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exit(1);
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}
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}
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/*
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* Check calling username
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*/
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ppid = getuid();
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pwent = getpwuid(ppid);
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if (!pwent) {
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fprintf(stderr, "mbuseradd: Cannot determine your user name.\n");
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exit(1);
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}
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if (strcmp(pwent->pw_name, (char *)"mbse") && strcmp(pwent->pw_name, (char *)"bbs")) {
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fprintf(stderr, "mbuseradd: only users `mbse' and `bbs' may do this.\n");
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exit(1);
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}
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/*
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* Get my groupname, this must be "bbs", other users may not
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* use this program, not even root.
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*/
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gr = getgrgid(pwent->pw_gid);
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if (!gr) {
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fprintf(stderr, "mbuseradd: Cannot determine group name.\n");
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exit(1);
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}
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if (strcmp(gr->gr_name, (char *)"bbs")) {
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fprintf(stderr, "mbuseradd: You are not a member of group `bbs'.\n");
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exit(1);
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}
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/*
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* We don't log into MBSE BBS logfiles but to the system logfiles,
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* because we are modifying system files not belonging to MBSE BBS.
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*/
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openlog("mbuseradd", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
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syslog(LOG_WARNING, "mbuseradd %s %s %s %s", argv[1], argv[2], argv[3], argv[4]);
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/*
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* Find out the name of our parent.
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*/
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temp = calloc(PATH_MAX, sizeof(char));
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ppid = getppid();
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#if defined(__OpenBSD__)
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/*
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* Systems that use sysctl to get process information
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*/
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC_ARGS;
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mib[2] = ppid;
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mib[3] = KERN_PROC_ARGV;
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if ((s = realloc(s, siz)) == NULL) {
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fprintf(stderr, "mbuseradd: no memory\n");
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exit(1);
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}
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if (sysctl(mib, 4, s, &siz, NULL, 0) == -1) {
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perror("");
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fprintf(stderr, "mbuseradd: sysctl call failed\n");
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syslog(LOG_WARNING, "sysctl call failed");
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exit(1);
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}
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buf[0] = '\0';
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for (p = s; *p != NULL; p++) {
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if (p != s)
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strlcat(buf, " ", sizeof(buf));
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strlcat(buf, *p, sizeof(buf));
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}
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syslog(LOG_WARNING, "\"%s\"", buf);
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printf("%s\n", buf);
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parent = xstrcpy(buf);
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#else
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/*
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* Systems with /proc filesystem like Linux, FreeBSD
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*/
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snprintf(temp, PATH_MAX, "/proc/%d/cmdline", ppid);
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if ((fp = fopen(temp, "r")) == NULL) {
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fprintf(stderr, "mbuseradd: can't read %s\n", temp);
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exit(1);
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}
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fgets(temp, PATH_MAX-1, fp);
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fclose(fp);
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parent = xstrcpy(Basename(temp));
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#endif
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if (strcmp((char *)"-mbnewusr", parent)) {
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fprintf(stderr, "mbuseradd: illegal parent\n");
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free(temp);
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free(parent);
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exit(1);
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}
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memset(args, 0, sizeof(args));
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shell = calloc(PATH_MAX, sizeof(char));
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homedir = calloc(PATH_MAX, sizeof(char));
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if (setuid(0) == -1 || setgid(1) == -1) {
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perror("");
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fprintf(stderr, "mbuseradd: Unable to setuid(root) or setgid(root)\n");
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fprintf(stderr, "Make sure that this program is set to -rwsr-sr-x\n");
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fprintf(stderr, "Owner must be root and group root\n");
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exit(1);
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}
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umask(0000);
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/*
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* We don't log into MBSE BBS logfiles but to the system logfiles,
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* because we are modifying system files not belonging to MBSE BBS.
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*/
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openlog("mbuseradd", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
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syslog(LOG_WARNING, "mbuseradd %s %s %s %s", argv[1], argv[2], argv[3], argv[4]);
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/*
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* Build command to add user entry to the /etc/passwd and /etc/shadow
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* files. We use the systems own useradd program.
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*/
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#if defined(__linux__) || defined(__NetBSD__) || defined(__OpenBSD__)
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if ((access("/usr/bin/useradd", R_OK)) == 0)
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args[0] = (char *)"/usr/bin/useradd";
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else if ((access("/bin/useradd", R_OK)) == 0)
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args[0] = (char *)"/bin/useradd";
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else if ((access("/usr/sbin/useradd", R_OK)) == 0)
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args[0] = (char *)"/usr/sbin/useradd";
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else if ((access("/sbin/useradd", R_OK)) == 0)
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args[0] = (char *)"/sbin/useradd";
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else {
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syslog(LOG_WARNING, "Can't find useradd");
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exit(1);
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}
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#elif __FreeBSD__
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if ((access("/usr/sbin/pw", X_OK)) == 0)
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args[0] = (char *)"/usr/sbin/pw";
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else if ((access("/sbin/pw", X_OK)) == 0)
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args[0] = (char *)"/sbin/pw";
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else {
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syslog(LOG_WARNING, "Can't find pw");
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exit(1);
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}
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#else
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#error "Don't know how to add a user on this OS"
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#endif
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snprintf(shell, PATH_MAX, "%s/bin/mbsebbs", getenv("MBSE_ROOT"));
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snprintf(homedir, PATH_MAX, "%s/%s", argv[4], argv[2]);
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#if defined(__linux__)
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args[1] = (char *)"-c";
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args[2] = argv[3];
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args[3] = (char *)"-d";
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args[4] = homedir;
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args[5] = (char *)"-g";
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args[6] = argv[1];
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args[7] = (char *)"-s";
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args[8] = shell;
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args[9] = argv[2];
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args[10] = NULL;
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#elif defined(__NetBSD__) || defined(__OpenBSD__)
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args[1] = (char *)"-c";
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args[2] = argv[3];
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args[3] = (char *)"-d";
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args[4] = homedir;
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args[5] = (char *)"-g";
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args[6] = argv[1];
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args[7] = (char *)"-s";
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args[8] = shell;
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args[9] = (char *)"-m";
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args[10] = argv[2];
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args[11] = NULL;
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#elif defined(__FreeBSD__)
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args[1] = (char *)"useradd";
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args[2] = argv[2];
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args[3] = (char *)"-c";
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args[4] = argv[3];
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args[5] = (char *)"-d";
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args[6] = homedir;
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args[7] = (char *)"-g";
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args[8] = argv[1];
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args[9] = (char *)"-s";
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args[10] = shell;
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args[11] = NULL;
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#else
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#error "Don't know how to add a user on this OS"
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#endif
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if (execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty") != 0) {
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syslog(LOG_WARNING, "Failed to create unix account");
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exit(1);
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}
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syslog(LOG_WARNING, "Created Unix account");
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/*
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* Now create directories and files for this user.
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*/
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if ((pwent = getpwnam((char *)"mbse")) == NULL) {
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syslog(LOG_WARNING, "Can't get password entry for \"mbse\"");
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exit(2);
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}
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/*
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*
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* Check bbs users base home directory
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*/
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if ((access(argv[4], R_OK)) != 0) {
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syslog(LOG_WARNING, "No bbs base homedirectory, creating..");
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makedir(argv[4], 0770, pwent->pw_uid, pwent->pw_gid);
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}
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/*
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* Now create users home directory. Check for an existing directory,
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* some systems have already created a home directory. If one is found
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* it is removed to create a fresh one.
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*/
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if ((access(homedir, R_OK)) == 0) {
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if ((access("/bin/rm", X_OK)) == 0)
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args[0] = (char *)"/bin/rm";
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else if ((access("/usr/bin/rm", X_OK)) == 0)
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args[0] = (char *)"/usr/bin/rm";
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else {
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syslog(LOG_WARNING, "Can't find rm");
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exit(2);
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}
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args[1] = (char *)"-Rf";
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args[2] = homedir;
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args[3] = NULL;
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i = execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty");
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if (i != 0) {
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syslog(LOG_WARNING, "Unable remove old home directory");
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exit(2);
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}
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}
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/*
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* Create users home directory.
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*/
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if ((pwuser = getpwnam(argv[2])) == NULL) {
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syslog(LOG_WARNING, "Can't get passwd entry for %s", argv[2]);
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exit(2);
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}
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makedir(homedir, 0770, pwuser->pw_uid, pwent->pw_gid);
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/*
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* Create Maildir and subdirs for Qmail.
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*/
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snprintf(temp, PATH_MAX, "%s/%s/Maildir", argv[4], argv[2]);
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makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
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snprintf(temp, PATH_MAX, "%s/%s/Maildir/cur", argv[4], argv[2]);
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makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
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snprintf(temp, PATH_MAX, "%s/%s/Maildir/new", argv[4], argv[2]);
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makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
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snprintf(temp, PATH_MAX, "%s/%s/Maildir/tmp", argv[4], argv[2]);
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makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
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#ifdef _VPOPMAIL_PATH
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snprintf(temp, PATH_MAX, "%s/vadduser", _VPOPMAIL_PATH);
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args[0] = temp;
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args[1] = argv[2];
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args[2] = argv[2];
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args[3] = NULL;
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if (execute(args, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty") != 0) {
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syslog(LOG_WARNING, "Failed to create vpopmail account");
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} else {
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syslog(LOG_WARNING, "Created vpopmail account");
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}
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#endif
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free(shell);
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free(temp);
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free(homedir);
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syslog(LOG_WARNING, "Added system account for user\"%s\"", argv[2]);
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exit(0);
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}
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void Help()
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{
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fprintf(stderr, "\nmbuseradd commandline:\n\n");
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fprintf(stderr, "mbuseradd [gid] [name] [comment] [usersdir]\n");
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exit(1);
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}
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