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shadow/lib/console.c
Daniel Baumann 09a180ea01
Adding upstream version 1:4.17.4.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 05:06:56 +02:00

112 lines
2.3 KiB
C

/*
* SPDX-FileCopyrightText: 1991 , Julianne Frances Haugh
* SPDX-FileCopyrightText: 1991 , Chip Rosenthal
* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include "defines.h"
#include "getdef.h"
#include "prototypes.h"
#include "string/strcmp/streq.h"
#include "string/strcpy/strtcpy.h"
#include "string/strtok/stpsep.h"
/*
* 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[1024], *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;
STRTCPY(buf, cons);
pbuf = buf;
while (NULL != (s = strsep(&pbuf, ":"))) {
if (streq(s, tty)) {
return true;
}
}
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, sizeof (buf), fp) != NULL) {
stpsep(buf, "\n");
if (streq(buf, tty)) {
(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);
}