498 lines
12 KiB
C
498 lines
12 KiB
C
/*****************************************************************************
|
|
*
|
|
* $Id$
|
|
* Purpose ...............: setuid root version of useradd
|
|
*
|
|
*****************************************************************************
|
|
* Copyright (C) 1997-2005
|
|
*
|
|
* 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 <grp.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 <time.h>
|
|
|
|
#if defined(__OpenBSD__) || defined(__NetBSD__)
|
|
#include <sys/sysctl.h>
|
|
#endif
|
|
|
|
#include "xmalloc.h"
|
|
#include "mbuseradd.h"
|
|
|
|
|
|
/*
|
|
* Milliseconds timer, returns 0 on success.
|
|
*/
|
|
int msleep(int msecs)
|
|
{
|
|
int rc;
|
|
struct timespec req, rem;
|
|
|
|
rem.tv_sec = 0;
|
|
rem.tv_nsec = 0;
|
|
req.tv_sec = msecs / 1000;
|
|
req.tv_nsec = (msecs % 1000) * 1000000;
|
|
|
|
while (1) {
|
|
rc = nanosleep(&req, &rem);
|
|
if (rc == 0)
|
|
break;
|
|
if ((errno == EINVAL) || (errno == EFAULT))
|
|
break;
|
|
|
|
/*
|
|
* Error was EINTR, run timer again to complete.
|
|
*/
|
|
req.tv_sec = rem.tv_sec;
|
|
req.tv_nsec = rem.tv_nsec;
|
|
rem.tv_sec = 0;
|
|
rem.tv_nsec = 0;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
int execute(char **args, char *in, char *out, char *err)
|
|
{
|
|
char buf[PATH_MAX];
|
|
int i, pid, status = 0, rc = 0;
|
|
|
|
memset(&buf, 0, sizeof(buf));
|
|
for (i = 0; i < 16; i++) {
|
|
if (args[i])
|
|
snprintf(buf + strlen(buf), PATH_MAX - strlen(buf), " %s", args[i]);
|
|
else
|
|
break;
|
|
}
|
|
syslog(LOG_WARNING, "Execute:%s", buf);
|
|
|
|
fflush(stdout);
|
|
fflush(stderr);
|
|
|
|
if ((pid = fork()) == 0) {
|
|
msleep(150);
|
|
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);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Internal version of basename to make this better portable.
|
|
*/
|
|
char *Basename(char *str)
|
|
{
|
|
char *cp = strrchr(str, '/');
|
|
|
|
return cp ? cp+1 : str;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* 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], *parent;
|
|
int i;
|
|
struct passwd *pwent, *pwuser;
|
|
struct group *gr;
|
|
pid_t ppid;
|
|
#if defined(__OpenBSD__)
|
|
#define ARG_SIZE 60
|
|
static char **s, buf[ARG_SIZE];
|
|
size_t siz = 100;
|
|
char **p;
|
|
int mib[4];
|
|
#elif defined(__NetBSD__)
|
|
#define ARG_SIZE 60
|
|
static char **s;
|
|
size_t siz = 100;
|
|
int mib[4];
|
|
#else
|
|
FILE *fp;
|
|
#endif
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check calling username
|
|
*/
|
|
ppid = getuid();
|
|
pwent = getpwuid(ppid);
|
|
if (!pwent) {
|
|
fprintf(stderr, "mbuseradd: Cannot determine your user name.\n");
|
|
exit(1);
|
|
}
|
|
if (strcmp(pwent->pw_name, (char *)"mbse") && strcmp(pwent->pw_name, (char *)"bbs")) {
|
|
fprintf(stderr, "mbuseradd: only users `mbse' and `bbs' may do this.\n");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Get my groupname, this must be "bbs", other users may not
|
|
* use this program, not even root.
|
|
*/
|
|
gr = getgrgid(pwent->pw_gid);
|
|
if (!gr) {
|
|
fprintf(stderr, "mbuseradd: Cannot determine group name.\n");
|
|
exit(1);
|
|
}
|
|
if (strcmp(gr->gr_name, (char *)"bbs")) {
|
|
fprintf(stderr, "mbuseradd: You are not a member of group `bbs'.\n");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Find out the name of our parent.
|
|
*/
|
|
temp = calloc(PATH_MAX, sizeof(char));
|
|
ppid = getppid();
|
|
|
|
#if defined(__OpenBSD__)
|
|
/*
|
|
* Systems that use sysctl to get process information
|
|
*/
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC_ARGS;
|
|
mib[2] = ppid;
|
|
mib[3] = KERN_PROC_ARGV;
|
|
if ((s = realloc(s, siz)) == NULL) {
|
|
fprintf(stderr, "mbuseradd: no memory\n");
|
|
exit(1);
|
|
}
|
|
if (sysctl(mib, 4, s, &siz, NULL, 0) == -1) {
|
|
perror("");
|
|
fprintf(stderr, "mbuseradd: sysctl call failed\n");
|
|
exit(1);
|
|
}
|
|
buf[0] = '\0';
|
|
for (p = s; *p != NULL; p++) {
|
|
if (p != s)
|
|
strlcat(buf, " ", sizeof(buf));
|
|
strlcat(buf, *p, sizeof(buf));
|
|
}
|
|
parent = xstrcpy(buf);
|
|
#elif defined(__NetBSD__)
|
|
/*
|
|
* Systems that use sysctl to get process information
|
|
*/
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC_ARGS;
|
|
mib[2] = ppid;
|
|
mib[3] = KERN_PROC_ARGV;
|
|
if ((s = realloc(s, siz)) == NULL) {
|
|
fprintf(stderr, "mbuseradd: no memory\n");
|
|
exit(1);
|
|
}
|
|
if (sysctl(mib, 4, s, &siz, NULL, 0) == -1) {
|
|
perror("");
|
|
fprintf(stderr, "mbuseradd: sysctl call failed\n");
|
|
exit(1);
|
|
}
|
|
parent = xstrcpy((char *)s);
|
|
#else
|
|
/*
|
|
* Systems with /proc filesystem like Linux, FreeBSD
|
|
*/
|
|
snprintf(temp, PATH_MAX, "/proc/%d/cmdline", ppid);
|
|
if ((fp = fopen(temp, "r")) == NULL) {
|
|
fprintf(stderr, "mbuseradd: can't read %s\n", temp);
|
|
exit(1);
|
|
}
|
|
fgets(temp, PATH_MAX-1, fp);
|
|
fclose(fp);
|
|
parent = xstrcpy(Basename(temp));
|
|
#endif
|
|
|
|
if (strcmp((char *)"-mbnewusr", parent)) {
|
|
fprintf(stderr, "mbuseradd: illegal parent \"%s\"\n", parent);
|
|
free(temp);
|
|
free(parent);
|
|
exit(1);
|
|
}
|
|
|
|
memset(args, 0, sizeof(args));
|
|
|
|
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__) || defined(__OpenBSD__)
|
|
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
|
|
#error "Don't know how to add a user on this OS"
|
|
#endif
|
|
|
|
snprintf(shell, PATH_MAX, "%s/bin/mbsebbs", getenv("MBSE_ROOT"));
|
|
snprintf(homedir, PATH_MAX, "%s/%s", argv[4], argv[2]);
|
|
|
|
#if defined(__linux__)
|
|
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;
|
|
#elif defined(__NetBSD__) || defined(__OpenBSD__)
|
|
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] = (char *)"-m";
|
|
args[10] = argv[2];
|
|
args[11] = NULL;
|
|
#elif defined(__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;
|
|
#else
|
|
#error "Don't know how to add a user on this OS"
|
|
#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.
|
|
*/
|
|
snprintf(temp, PATH_MAX, "%s/%s/Maildir", argv[4], argv[2]);
|
|
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
|
|
snprintf(temp, PATH_MAX, "%s/%s/Maildir/cur", argv[4], argv[2]);
|
|
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
|
|
snprintf(temp, PATH_MAX, "%s/%s/Maildir/new", argv[4], argv[2]);
|
|
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
|
|
snprintf(temp, PATH_MAX, "%s/%s/Maildir/tmp", argv[4], argv[2]);
|
|
makedir(temp, 0700, pwuser->pw_uid, pwent->pw_gid);
|
|
|
|
#ifdef _VPOPMAIL_PATH
|
|
snprintf(temp, PATH_MAX, "%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);
|
|
}
|
|
|
|
|