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/*
* Copyright (c) 1991 , Julianne Frances Haugh
* Copyright (c) 1991 , Chip Rosenthal
* Copyright (c) 1996 - 1998, Marek Michałkiewicz
* Copyright (c) 2003 - 2005, Tomasz Kłoczko
* Copyright (c) 2007 - 2010, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, 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. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include "defines.h"
#include <stdio.h>
#include "getdef.h"
#include "prototypes.h"
#ident "$Id: console.c 3289 2010-11-19 21:54:41Z nekral-guest $"
/* local function prototypes */
static bool is_listed (const char *cfgin, const char *tty, bool def);
/*
* This is now rather generic function which decides if "tty" is listed
* under "cfgin" in config (directly or indirectly). Fallback to default if
* something is bad.
*/
static bool is_listed (const char *cfgin, const char *tty, bool def)
{
FILE *fp;
char buf[200], *s;
const char *cons;
/*
* If the CONSOLE configuration definition isn't given,
* fallback to default.
*/
cons = getdef_str (cfgin);
if (NULL == cons) {
return def;
}
/*
* If this isn't a filename, then it is a ":" delimited list of
* console devices upon which root logins are allowed.
*/
if (*cons != '/') {
char *pbuf;
strcpy (buf, cons);
pbuf = &buf[0];
while ((s = strtok (pbuf, ":")) != NULL) {
if (strcmp (s, tty) == 0) {
return true;
}
pbuf = NULL;
}
return false;
}
/*
* If we can't open the console list, then call everything a
* console - otherwise root will never be allowed to login.
*/
fp = fopen (cons, "r");
if (NULL == fp) {
return def;
}
/*
* See if this tty is listed in the console file.
*/
while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
buf[strlen (buf) - 1] = '\0';
if (strcmp (buf, tty) == 0) {
(void) fclose (fp);
return true;
}
}
/*
* This tty isn't a console.
*/
(void) fclose (fp);
return false;
}
/*
* console - return 1 if the "tty" is a console device, else 0.
*
* Note - we need to take extreme care here to avoid locking out root logins
* if something goes awry. That's why we do things like call everything a
* console if the consoles file can't be opened. Because of this, we must
* warn the user to protect against the remove of the consoles file since
* that would allow an unauthorized root login.
*/
bool console (const char *tty)
{
if (strncmp (tty, "/dev/", 5) == 0) {
tty += 5;
}
return is_listed ("CONSOLE", tty, true);
}
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