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/*
* Copyright (c) 1987-2012 by the citadel.org team
*
* This program is open source software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3.
*
* 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.
*/
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <pwd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <dirent.h>
#include "citadel.h"
#include "sysdep.h"
#include "citadel_dirs.h"
/* These pipes are used to talk to the chkpwd daemon, which is forked during startup */
int chkpwd_write_pipe[2];
int chkpwd_read_pipe[2];
/*
* Validate a password on the host unix system by talking to the chkpwd daemon
*/
static int validpw(uid_t uid, const char *pass)
{
char buf[256];
int rv;
rv = write(chkpwd_write_pipe[1], &uid, sizeof(uid_t));
if (rv == -1) {
printf( "Communicatino with chkpwd broken: %s\n", strerror(errno));
return 0;
}
rv = write(chkpwd_write_pipe[1], pass, 256);
if (rv == -1) {
printf( "Communicatino with chkpwd broken: %s\n", strerror(errno));
return 0;
}
rv = read(chkpwd_read_pipe[0], buf, 4);
if (rv == -1) {
printf( "Communicatino with chkpwd broken: %s\n", strerror(errno));
return 0;
}
if (!strncmp(buf, "PASS", 4)) {
printf("pass\n");
return(1);
}
printf("fail\n");
return 0;
}
/*
* Start up the chkpwd daemon so validpw() has something to talk to
*/
void start_chkpwd_daemon(void) {
pid_t chkpwd_pid;
struct stat filestats;
int i;
printf("Starting chkpwd daemon for host authentication mode\n");
if ((stat(file_chkpwd, &filestats)==-1) ||
(filestats.st_size==0)){
printf("didn't find chkpwd daemon in %s: %s\n", file_chkpwd, strerror(errno));
abort();
}
if (pipe(chkpwd_write_pipe) != 0) {
printf("Unable to create pipe for chkpwd daemon: %s\n", strerror(errno));
abort();
}
if (pipe(chkpwd_read_pipe) != 0) {
printf("Unable to create pipe for chkpwd daemon: %s\n", strerror(errno));
abort();
}
chkpwd_pid = fork();
if (chkpwd_pid < 0) {
printf("Unable to fork chkpwd daemon: %s\n", strerror(errno));
abort();
}
if (chkpwd_pid == 0) {
dup2(chkpwd_write_pipe[0], 0);
dup2(chkpwd_read_pipe[1], 1);
for (i=2; i<256; ++i) close(i);
execl(file_chkpwd, file_chkpwd, NULL);
printf("Unable to exec chkpwd daemon: %s\n", strerror(errno));
abort();
exit(errno);
}
}
int main(int argc, char **argv) {
char buf[256];
struct passwd *p;
int uid;
char ctdldir[PATH_MAX]=CTDLDIR;
calc_dirs_n_files(0,0,"", ctdldir, 0);
printf("\n\n ** host auth mode test utility **\n\n");
start_chkpwd_daemon();
if (getuid() != 0){
printf("\n\nERROR: you need to be root to run this!\n\n");
return(1);
}
while(1) {
printf("\n\nUsername: ");
fgets(buf, sizeof buf, stdin);
buf[strlen(buf)-1] = 0;
p = getpwnam(buf);
if (p == NULL) {
printf("Not found\n");
}
else {
uid = p->pw_uid;
printf(" uid: %d\n", uid);
printf("Password: ");
fgets(buf, sizeof buf, stdin);
buf[strlen(buf)-1] = 0;
validpw(uid, buf);
}
}
return(0);
}
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