/*-
* Copyright (c) 1996 by
* Sean Eric Fagan <sef@kithrup.com>
* David Nugent <davidn@blaze.net.au>
* All rights reserved.
*
* Portions copyright (c) 1995,1997 by
* Berkeley Software Design, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. This work was done expressly for inclusion into FreeBSD. Other use
* is permitted provided this notation is included.
* 4. Absolutely no warranty of function or purpose is made by the authors.
* 5. Modifications may be freely made to this file providing the above
* conditions are met.
*
* Low-level routines relating to the user capabilities database
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <limits.h>
#include <login_cap.h>
#include <paths.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
/*
* auth_checknologin()
* Checks for the existance of a nologin file in the login_cap
* capability <lc>. If there isn't one specified, then it checks
* to see if this class should just ignore nologin files. Lastly,
* it tries to print out the default nologin file, and, if such
* exists, it exits.
*/
void
auth_checknologin(login_cap_t *lc)
{
const char *file;
/* Do we ignore a nologin file? */
if (login_getcapbool(lc, "ignorenologin", 0))
return;
/* Note that <file> will be "" if there is no nologin capability */
if ((file = login_getcapstr(lc, "nologin", "", NULL)) == NULL)
exit(1);
/*
* *file is true IFF there was a "nologin" capability
* Note that auth_cat() returns 1 only if the specified
* file exists, and is readable. E.g., /.nologin exists.
*/
if ((*file && auth_cat(file)) || auth_cat(_PATH_NOLOGIN))
exit(1);
}
/*
* auth_cat()
* Checks for the readability of <file>; if it can be opened for
* reading, it prints it out to stdout, and then exits. Otherwise,
* it returns 0 (meaning no nologin file).
*/
int
auth_cat(const char *file)
{
int fd, count;
char buf[BUFSIZ];
if ((fd = open(file, O_RDONLY | O_CLOEXEC)) < 0)
return 0;
while ((count = read(fd, buf, sizeof(buf))) > 0)
(void)write(fileno(stdout), buf, count);
close(fd);
sleep(5); /* wait an arbitrary time to drain */
return 1;
}
