1 /************************************************************************
2 * Copyright 1995 by Wietse Venema. All rights reserved.
4 * This material was originally written and compiled by Wietse Venema at
5 * Eindhoven University of Technology, The Netherlands, in 1990, 1991,
6 * 1992, 1993, 1994 and 1995.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that this entire copyright notice is duplicated in all such
12 * This software is provided "as is" and without any expressed or implied
13 * warranties, including, without limitation, the implied warranties of
14 * merchantibility and fitness for any particular purpose.
15 ************************************************************************/
19 void login_fbtab(tty, uid, gid)
25 This module implements device security as described in the
26 SunOS 4.1.x fbtab(5) and SunOS 5.x logindevperm(4) manual
27 pages. The program first looks for /etc/fbtab. If that file
28 cannot be opened it attempts to process /etc/logindevperm.
29 We expect entries with the folowing format:
31 Comments start with a # and extend to the end of the line.
33 Blank lines or lines with only a comment are ignored.
35 All other lines consist of three fields delimited by
36 whitespace: a login device (/dev/console), an octal
37 permission number (0600), and a ":"-delimited list of
38 devices (/dev/kbd:/dev/mouse). All device names are
39 absolute paths. A path that ends in "*" refers to all
40 directory entries except "." and "..".
42 If the tty argument (relative path) matches a login device
43 name (absolute path), the permissions of the devices in the
44 ":"-delimited list are set as specified in the second
45 field, and their ownership is changed to that of the uid
49 Problems are reported via the syslog daemon with severity
53 This module uses strtok(3), which may cause conflicts with other
54 uses of that same routine.
57 Wietse Venema (wietse@wzv.win.tue.nl)
58 Eindhoven University of Technology
62 #include <sys/types.h>
70 #include "pathnames.h"
72 void login_protect __P((char *, char *, int, uid_t, gid_t));
73 void login_fbtab __P((char *tty, uid_t uid, gid_t gid));
75 #define WSPACE " \t\n"
77 /* login_fbtab - apply protections specified in /etc/fbtab or logindevperm */
80 login_fbtab(tty, uid, gid)
92 if ((fp = fopen(table = _PATH_FBTAB, "r")) == 0
93 && (fp = fopen(table = _PATH_LOGINDEVPERM, "r")) == 0)
96 while (fgets(buf, sizeof(buf), fp)) {
97 if ((cp = strchr(buf, '#')))
98 *cp = 0; /* strip comment */
99 if ((cp = devname = strtok(buf, WSPACE)) == 0)
100 continue; /* empty or comment */
101 if (strncmp(devname, "/dev/", 5) != 0
102 || (cp = strtok((char *) 0, WSPACE)) == 0
104 || sscanf(cp, "%o", &prot) == 0
106 || (prot & 0777) != prot
107 || (cp = strtok((char *) 0, WSPACE)) == 0) {
108 syslog(LOG_ERR, "%s: bad entry: %s", table, cp ? cp : "(null)");
111 if (strcmp(devname + 5, tty) == 0) {
112 for (cp = strtok(cp, ":"); cp; cp = strtok((char *) 0, ":")) {
113 login_protect(table, cp, prot, uid, gid);
120 /* login_protect - protect one device entry */
123 login_protect(table, path, mask, uid, gid)
131 int pathlen = strlen(path);
135 if (strcmp("/*", path + pathlen - 2) != 0) {
136 /* clear flags of the device */
137 if (chflags(path, 0) && errno != ENOENT && errno != EOPNOTSUPP)
138 syslog(LOG_ERR, "%s: chflags(%s): %m", table, path);
139 if (chmod(path, mask) && errno != ENOENT)
140 syslog(LOG_ERR, "%s: chmod(%s): %m", table, path);
141 if (chown(path, uid, gid) && errno != ENOENT)
142 syslog(LOG_ERR, "%s: chown(%s): %m", table, path);
145 buf[pathlen - 1] = 0;
146 if ((dir = opendir(buf)) == 0) {
147 syslog(LOG_ERR, "%s: opendir(%s): %m", table, path);
149 while ((ent = readdir(dir)) != 0) {
150 if (strcmp(ent->d_name, ".") != 0
151 && strcmp(ent->d_name, "..") != 0) {
152 strcpy(buf + pathlen - 1, ent->d_name);
153 login_protect(table, buf, mask, uid, gid);