112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* SPDX-FileCopyrightText: 1991 , Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1991 , Chip Rosenthal
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#include "defines.h"
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#include <stdio.h>
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#include "getdef.h"
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#include "prototypes.h"
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#ident "$Id$"
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/* local function prototypes */
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static bool is_listed (const char *cfgin, const char *tty, bool def);
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/*
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* This is now rather generic function which decides if "tty" is listed
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* under "cfgin" in config (directly or indirectly). Fallback to default if
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* something is bad.
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*/
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static bool is_listed (const char *cfgin, const char *tty, bool def)
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{
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FILE *fp;
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char buf[1024], *s;
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const char *cons;
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/*
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* If the CONSOLE configuration definition isn't given,
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* fallback to default.
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*/
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cons = getdef_str (cfgin);
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if (NULL == cons) {
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return def;
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}
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/*
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* If this isn't a filename, then it is a ":" delimited list of
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* console devices upon which root logins are allowed.
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*/
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if (*cons != '/') {
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char *pbuf;
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strncpy (buf, cons, sizeof (buf));
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buf[sizeof (buf) - 1] = '\0';
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pbuf = &buf[0];
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while ((s = strtok (pbuf, ":")) != NULL) {
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if (strcmp (s, tty) == 0) {
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return true;
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}
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pbuf = NULL;
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}
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return false;
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}
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/*
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* If we can't open the console list, then call everything a
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* console - otherwise root will never be allowed to login.
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*/
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fp = fopen (cons, "r");
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if (NULL == fp) {
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return def;
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}
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/*
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* See if this tty is listed in the console file.
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*/
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while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
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buf[strlen (buf) - 1] = '\0';
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if (strcmp (buf, tty) == 0) {
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(void) fclose (fp);
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return true;
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}
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}
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/*
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* This tty isn't a console.
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*/
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(void) fclose (fp);
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return false;
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}
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/*
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* console - return 1 if the "tty" is a console device, else 0.
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*
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* Note - we need to take extreme care here to avoid locking out root logins
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* if something goes awry. That's why we do things like call everything a
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* console if the consoles file can't be opened. Because of this, we must
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* warn the user to protect against the remove of the consoles file since
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* that would allow an unauthorized root login.
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*/
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bool console (const char *tty)
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{
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if (strncmp (tty, "/dev/", 5) == 0) {
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tty += 5;
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}
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return is_listed ("CONSOLE", tty, true);
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}
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