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deb-mbse/unix/mbuseradd.c

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/*****************************************************************************
*
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* $Id$
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* Purpose ...............: setuid root version of useradd
*
*****************************************************************************
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* Copyright (C) 1997-2002
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*
* 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, 675 Mass Ave, Cambridge, MA 02139, 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>
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#include <sys/param.h>
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#include "mbuseradd.h"
int execute(char *cmd, char *file, char *in, char *out, char *err)
{
char buf[PATH_MAX];
char *vector[16];
int i;
int pid, status, rc, sverr;
sprintf(buf, "%s %s", cmd, file);
i=0;
vector[i++] = strtok(buf, " \t\n");
while ((vector[i++] = strtok(NULL," \t\n")) && (i < 16));
vector[15] = NULL;
fflush(stdout);
fflush(stderr);
if ((pid = fork()) == 0) {
if (in) {
close(0);
if (open(in, O_RDONLY) != 0) {
perror("");
fprintf(stderr, "mbuseradd: Reopen of stdin to %s failed\n", in);
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_exit(-1);
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}
}
if (out) {
close(1);
if (open(out, O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
perror("");
fprintf(stderr, "mbuseradd: Reopen of stdout to %s failed\n", out);
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_exit(-1);
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}
}
if (err) {
close(2);
if (open(err, O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
perror("");
fprintf(stderr, "mbuseradd: Reopen of stderr to %s failed\n", err);
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_exit(-1);
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}
}
rc = execv(vector[0],vector);
fprintf(stderr, "mbuseradd: Exec \"%s\" returned %d\n", vector[0], rc);
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_exit(-1);
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}
do {
rc = wait(&status);
sverr = errno;
} while (((rc > 0) && (rc != pid)) || ((rc == -1) && (sverr == EINTR)));
if (rc == -1) {
fprintf(stderr, "mbuseradd: Wait returned %d, status %d,%d\n", rc, status >> 8, status & 0xff);
return -1;
}
return status;
}
void makedir(char *path, mode_t mode, uid_t owner, gid_t group)
{
if (mkdir(path, mode) != 0) {
perror("");
fprintf(stderr, "mbuseradd: Can't create %s\n", path);
exit(2);
}
if ((chown(path, owner, group)) == -1) {
perror("");
fprintf(stderr, "mbuseradd: Unable to change ownership of %s\n", 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 *PassEnt, *temp, *shell;
int i;
struct passwd *pwent, *pwuser;
if (argc != 5)
Help();
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/*
* First simple check for argument overflow
*/
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for (i = 1; i < 5; i++) {
if (strlen(argv[i]) > 80) {
fprintf(stderr, "mbuseradd: Argument %d is too long\n", i);
exit(1);
}
}
PassEnt = calloc(PATH_MAX, sizeof(char));
temp = calloc(PATH_MAX, sizeof(char));
shell = calloc(PATH_MAX, sizeof(char));
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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);
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/*
* Build command to add user entry to the /etc/passwd and /etc/shadow
* files. We use the systems own useradd program.
*/
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#if defined(__linux__) || defined(__NetBSD__)
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if ((access("/usr/bin/useradd", R_OK)) == 0)
strcpy(temp, "/usr/bin/useradd");
else if ((access("/bin/useradd", R_OK)) == 0)
strcpy(temp, "/bin/useradd");
else if ((access("/usr/sbin/useradd", R_OK)) == 0)
strcpy(temp, "/usr/sbin/useradd");
else if ((access("/sbin/useradd", R_OK)) == 0)
strcpy(temp, "/sbin/useradd");
else {
fprintf(stderr, "mbuseradd: Can't find useradd\n");
exit(1);
}
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#elif __FreeBSD__
if ((access("/usr/sbin/pw", X_OK)) == 0)
strcpy(temp, "/usr/sbin/pw");
else if ((access("/sbin/pw", X_OK)) == 0)
strcpy(temp, "/sbin/pw");
else {
fprintf(stderr, "mbuseradd: Can't find pw\n");
exit(1);
}
#else
fprintf(stderr, "mbuseradd: Don't know how to add a user on this OS\n");
exit(1);
#endif
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sprintf(shell, "%s/bin/mbsebbs", getenv("MBSE_ROOT"));
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#if defined(__linux__) || defined(__NetBSD__)
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sprintf(PassEnt, "%s -c \"%s\" -d %s/%s -g %s -s %s %s",
temp, argv[3], argv[4], argv[2], argv[1], shell, argv[2]);
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#endif
#ifdef __FreeBSD__
sprintf(PassEnt, "%s useradd %s -c \"%s\" -d %s/%s -g %s -s %s",
temp, argv[2], argv[3], argv[4], argv[2], argv[1], shell);
#endif
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fflush(stdout);
fflush(stdin);
if (system(PassEnt) != 0) {
perror("mbuseradd: Failed to create unix account\n");
exit(1);
}
/*
* Now create directories and files for this user.
*/
if ((pwent = getpwnam((char *)"mbse")) == NULL) {
perror("mbuseradd: Can't get password entry for \"mbse\"\n");
exit(2);
}
/*
* Check bbs users base home directory
*/
if ((access(argv[4], R_OK)) != 0)
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.
*/
sprintf(temp, "%s/%s", argv[4], argv[2]);
if ((access(temp, R_OK)) == 0) {
if ((access("/bin/rm", X_OK)) == 0)
strcpy(shell, "/bin/rm");
else if ((access("/usr/bin/rm", X_OK)) == 0)
strcpy(shell, "/usr/bin/rm");
else {
fprintf(stderr, "mbuseradd: Can't find rm\n");
exit(2);
}
sprintf(PassEnt, " -Rf %s", temp);
fflush(stdout);
fflush(stdin);
i = execute(shell, PassEnt, (char *)"/dev/tty", (char *)"/dev/tty", (char *)"/dev/tty");
if (i != 0) {
fprintf(stderr, "mbuseradd: Unable remove old home directory\n");
exit(2);
}
}
/*
* Create users home directory.
*/
pwuser = getpwnam(argv[2]);
makedir(temp, 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);
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#ifdef _VPOPMAIL_PATH
sprintf(temp, "%s/vadduser %s %s", _VPOPMAIL_PATH, argv[2], argv[2]);
fflush(stdout);
fflush(stdin);
if (system(temp) != 0) {
perror("mbuseradd: Failed to create vpopmail account\n");
}
#endif
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free(shell);
free(PassEnt);
free(temp);
exit(0);
}
void Help()
{
fprintf(stderr, "\nmbuseradd commandline:\n\n");
fprintf(stderr, "mbuseradd [gid] [name] [comment] [usersdir]\n");
exit(1);
}