143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/************************************************************************
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* Copyright 1995 by Wietse Venema. All rights reserved.
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*
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* This material was originally written and compiled by Wietse Venema at
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* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
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* 1992, 1993, 1994 and 1995.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this entire copyright notice is duplicated in all such
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* copies.
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*
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* This software is provided "as is" and without any expressed or implied
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* warranties, including, without limitation, the implied warranties of
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* merchantibility and fitness for any particular purpose.
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************************************************************************/
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/*
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SYNOPSIS
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void login_fbtab(tty, uid, gid)
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char *tty;
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uid_t uid;
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gid_t gid;
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DESCRIPTION
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This module implements device security as described in the
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SunOS 4.1.x fbtab(5) and SunOS 5.x logindevperm(4) manual
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pages. The program first looks for /etc/fbtab. If that file
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cannot be opened it attempts to process /etc/logindevperm.
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We expect entries with the following format:
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Comments start with a # and extend to the end of the line.
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Blank lines or lines with only a comment are ignored.
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All other lines consist of three fields delimited by
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whitespace: a login device (/dev/console), an octal
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permission number (0600), and a ":"-delimited list of
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devices (/dev/kbd:/dev/mouse). All device names are
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absolute paths. A path that ends in "*" refers to all
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directory entries except "." and "..".
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If the tty argument (relative path) matches a login device
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name (absolute path), the permissions of the devices in the
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":"-delimited list are set as specified in the second
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field, and their ownership is changed to that of the uid
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and gid arguments.
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DIAGNOSTICS
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Problems are reported via the syslog daemon with severity
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LOG_ERR.
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BUGS
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This module uses strtok(3), which may cause conflicts with other
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uses of that same routine.
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AUTHOR
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Wietse Venema (wietse@wzv.win.tue.nl)
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Eindhoven University of Technology
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The Netherlands
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <glob.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "login.h"
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#include "pathnames.h"
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static void login_protect(const char *, char *, int, uid_t, gid_t);
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#define WSPACE " \t\n"
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/* login_fbtab - apply protections specified in /etc/fbtab or logindevperm */
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void
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login_fbtab(char *tty, uid_t uid, gid_t gid)
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{
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FILE *fp;
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char buf[BUFSIZ];
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char *devname;
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char *cp;
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int prot;
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const char *table;
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if ((fp = fopen(table = _PATH_FBTAB, "r")) == NULL
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&& (fp = fopen(table = _PATH_LOGINDEVPERM, "r")) == NULL)
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return;
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while (fgets(buf, sizeof(buf), fp)) {
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if ((cp = strchr(buf, '#')))
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*cp = 0; /* strip comment */
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if ((cp = devname = strtok(buf, WSPACE)) == NULL)
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continue; /* empty or comment */
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if (strncmp(devname, _PATH_DEV, sizeof _PATH_DEV - 1) != 0
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|| (cp = strtok(NULL, WSPACE)) == NULL
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|| *cp != '0'
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|| sscanf(cp, "%o", &prot) == 0
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|| prot == 0
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|| (prot & 0777) != prot
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|| (cp = strtok(NULL, WSPACE)) == NULL) {
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syslog(LOG_ERR, "%s: bad entry: %s", table, cp ? cp : "(null)");
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continue;
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}
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if (strcmp(devname + 5, tty) == 0) {
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for (cp = strtok(cp, ":"); cp; cp = strtok(NULL, ":")) {
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login_protect(table, cp, prot, uid, gid);
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}
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}
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}
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fclose(fp);
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}
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/* login_protect - protect one device entry */
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static void
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login_protect(const char *table, char *pattern, int mask, uid_t uid, gid_t gid)
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{
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glob_t gl;
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char *path;
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unsigned int i;
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if (glob(pattern, GLOB_NOSORT, NULL, &gl) != 0)
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return;
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for (i = 0; i < gl.gl_pathc; i++) {
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path = gl.gl_pathv[i];
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/* clear flags of the device */
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if (chflags(path, 0) && errno != ENOENT && errno != EOPNOTSUPP)
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syslog(LOG_ERR, "%s: chflags(%s): %m", table, path);
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if (chmod(path, mask) && errno != ENOENT)
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syslog(LOG_ERR, "%s: chmod(%s): %m", table, path);
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if (chown(path, uid, gid) && errno != ENOENT)
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syslog(LOG_ERR, "%s: chown(%s): %m", table, path);
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}
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globfree(&gl);
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}
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