135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
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* Copyright (c) 1991 , Julianne Frances Haugh
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* Copyright (c) 1991 , Chip Rosenthal
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* Copyright (c) 1996 - 1998, Marek Michałkiewicz
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* Copyright (c) 2003 - 2005, Tomasz Kłoczko
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* Copyright (c) 2007 - 2010, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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