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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libutil/login_fbtab.c	Lines:	0	58	0.0 %
Date:	2017-11-07	Branches:	0	52	0.0 %


/*	$OpenBSD: login_fbtab.c,v 1.16 2015/11/27 01:57:59 mmcc Exp $	*/

/************************************************************************
* Copyright 1995 by Wietse Venema.  All rights reserved.  Some individual
* files may be covered by other copyrights.
*
* This material was originally written and compiled by Wietse Venema at
* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
* 1992, 1993, 1994 and 1995.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that this entire copyright notice
* is duplicated in all such copies.
*
* This software is provided "as is" and without any expressed or implied
* warranties, including, without limitation, the implied warranties of
* merchantibility and fitness for any particular purpose.
************************************************************************/
/*
    SYNOPSIS
	void login_fbtab(tty, uid, gid)
	char *tty;
	uid_t uid;
	gid_t gid;

    DESCRIPTION
	This module implements device security as described in the
	SunOS 4.1.x fbtab(5) and SunOS 5.x logindevperm(4) manual
	pages. The program first looks for /etc/fbtab. If that file
	cannot be opened it attempts to process /etc/logindevperm.
	We expect entries with the folowing format:

	    Comments start with a # and extend to the end of the line.

	    Blank lines or lines with only a comment are ignored.

	    All other lines consist of three fields delimited by
	    whitespace: a login device (/dev/console), an octal
	    permission number (0600), and a ":"-delimited list of
	    devices (/dev/kbd:/dev/mouse). All device names are
	    absolute paths. A path that ends in "*" refers to all
	    directory entries except "." and "..".

	    If the tty argument (relative path) matches a login device
	    name (absolute path), the permissions of the devices in the
	    ":"-delimited list are set as specified in the second
	    field, and their ownership is changed to that of the uid
	    and gid arguments.

    DIAGNOSTICS
	Problems are reported via the syslog daemon with severity
	LOG_ERR.

    AUTHOR
	Wietse Venema (wietse@wzv.win.tue.nl)
	Eindhoven University of Technology
	The Netherlands
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#include <dirent.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>

#define _PATH_FBTAB	"/etc/fbtab"

static void login_protect(const char *, mode_t, uid_t, gid_t);

#define	WSPACE		" \t\n"

/*
 * login_fbtab - apply protections specified in /etc/fbtab or logindevperm
 */
void
login_fbtab(const char *tty, uid_t uid, gid_t gid)
{
	FILE	*fp;
	char	*buf, *toklast, *tbuf, *devnam, *cp;
	mode_t	prot;
	size_t	len;

	if ((fp = fopen(_PATH_FBTAB, "r")) == NULL)
		return;

	tbuf = NULL;
	while ((buf = fgetln(fp, &len)) != NULL) {
		if (buf[len - 1] == '\n')
			buf[len - 1] = '\0';
		else {
			if ((tbuf = malloc(len + 1)) == NULL)
				break;
			memcpy(tbuf, buf, len);
			tbuf[len] = '\0';
			buf = tbuf;
		}
		if ((cp = strchr(buf, '#')))
			*cp = '\0';	/* strip comment */
		if (buf[0] == '\0' ||
		    (cp = devnam = strtok_r(buf, WSPACE, &toklast)) == NULL)
			continue;	/* empty or comment */
		if (strncmp(devnam, _PATH_DEV, sizeof(_PATH_DEV) - 1) != 0 ||
		    (cp = strtok_r(NULL, WSPACE, &toklast)) == NULL ||
		    *cp != '0' ||
		    sscanf(cp, "%o", &prot) == 0 ||
		    prot == 0 ||
		    (prot & 0777) != prot ||
		    (cp = strtok_r(NULL, WSPACE, &toklast)) == NULL) {
			syslog(LOG_ERR, "%s: bad entry: %s", _PATH_FBTAB,
			    cp ? cp : "(null)");
			continue;
		}
		if (strcmp(devnam + sizeof(_PATH_DEV) - 1, tty) == 0) {
			for (cp = strtok_r(cp, ":", &toklast); cp != NULL;
			    cp = strtok_r(NULL, ":", &toklast))
				login_protect(cp, prot, uid, gid);
		}
	}
	free(tbuf);
	fclose(fp);
}

/*
 * login_protect - protect one device entry
 */
static void
login_protect(const char *path, mode_t mask, uid_t uid, gid_t gid)
{
	char	buf[PATH_MAX];
	size_t	pathlen = strlen(path);
	DIR	*dir;
	struct	dirent *ent;

	if (pathlen >= sizeof(buf)) {
		errno = ENAMETOOLONG;
		syslog(LOG_ERR, "%s: %s: %m", _PATH_FBTAB, path);
		return;
	}

	if (strcmp("/*", path + pathlen - 2) != 0) {
		if (chmod(path, mask) && errno != ENOENT)
			syslog(LOG_ERR, "%s: chmod(%s): %m", _PATH_FBTAB, path);
		if (chown(path, uid, gid) && errno != ENOENT)
			syslog(LOG_ERR, "%s: chown(%s): %m", _PATH_FBTAB, path);
	} else {
		/*
		 * This is a wildcard directory (/path/to/whatever/ * ).
		 * Make a copy of path without the trailing '*' (but leave
		 * the trailing '/' so we can append directory entries.)
		 */
		memcpy(buf, path, pathlen - 1);
		buf[pathlen - 1] = '\0';
		if ((dir = opendir(buf)) == NULL) {
			syslog(LOG_ERR, "%s: opendir(%s): %m", _PATH_FBTAB,
			    path);
			return;
		}

		while ((ent = readdir(dir)) != NULL) {
			if (strcmp(ent->d_name, ".")  != 0 &&
			    strcmp(ent->d_name, "..") != 0) {
				buf[pathlen - 1] = '\0';
				if (strlcat(buf, ent->d_name, sizeof(buf))
				    >= sizeof(buf)) {
					errno = ENAMETOOLONG;
					syslog(LOG_ERR, "%s: %s: %m",
					    _PATH_FBTAB, path);
				} else
					login_protect(buf, mask, uid, gid);
			}
		}
		closedir(dir);
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: login_fbtab.c,v 1.16 2015/11/27 01:57:59 mmcc Exp $ */
2
3			/************************************************************************
4			* Copyright 1995 by Wietse Venema. All rights reserved. Some individual
5			* files may be covered by other copyrights.
6			*
7			* This material was originally written and compiled by Wietse Venema at
8			* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
9			* 1992, 1993, 1994 and 1995.
10			*
11			* Redistribution and use in source and binary forms, with or without
12			* modification, are permitted provided that this entire copyright notice
13			* is duplicated in all such copies.
14			*
15			* This software is provided "as is" and without any expressed or implied
16			* warranties, including, without limitation, the implied warranties of
17			* merchantibility and fitness for any particular purpose.
18			************************************************************************/
19			/*
20			SYNOPSIS
21			void login_fbtab(tty, uid, gid)
22			char *tty;
23			uid_t uid;
24			gid_t gid;
25
26			DESCRIPTION
27			This module implements device security as described in the
28			SunOS 4.1.x fbtab(5) and SunOS 5.x logindevperm(4) manual
29			pages. The program first looks for /etc/fbtab. If that file
30			cannot be opened it attempts to process /etc/logindevperm.
31			We expect entries with the folowing format:
32
33			Comments start with a # and extend to the end of the line.
34
35			Blank lines or lines with only a comment are ignored.
36
37			All other lines consist of three fields delimited by
38			whitespace: a login device (/dev/console), an octal
39			permission number (0600), and a ":"-delimited list of
40			devices (/dev/kbd:/dev/mouse). All device names are
41			absolute paths. A path that ends in "*" refers to all
42			directory entries except "." and "..".
43
44			If the tty argument (relative path) matches a login device
45			name (absolute path), the permissions of the devices in the
46			":"-delimited list are set as specified in the second
47			field, and their ownership is changed to that of the uid
48			and gid arguments.
49
50			DIAGNOSTICS
51			Problems are reported via the syslog daemon with severity
52			LOG_ERR.
53
54			AUTHOR
55			Wietse Venema (wietse@wzv.win.tue.nl)
56			Eindhoven University of Technology
57			The Netherlands
58			*/
59
60			#include <sys/types.h>
61			#include <sys/stat.h>
62
63			#include <errno.h>
64			#include <dirent.h>
65			#include <limits.h>
66			#include <paths.h>
67			#include <stdio.h>
68			#include <stdlib.h>
69			#include <string.h>
70			#include <syslog.h>
71			#include <unistd.h>
72			#include <util.h>
73
74			#define _PATH_FBTAB "/etc/fbtab"
75
76			static void login_protect(const char *, mode_t, uid_t, gid_t);
77
78			#define WSPACE " \t\n"
79
80			/*
81			* login_fbtab - apply protections specified in /etc/fbtab or logindevperm
82			*/
83			void
84			login_fbtab(const char *tty, uid_t uid, gid_t gid)
85			{
86			FILE *fp;
87			char buf, toklast, tbuf, devnam, *cp;
88			mode_t prot;
89			size_t len;
90
91			if ((fp = fopen(_PATH_FBTAB, "r")) == NULL)
92			return;
93
94			tbuf = NULL;
95			while ((buf = fgetln(fp, &len)) != NULL) {
96			if (buf[len - 1] == '\n')
97			buf[len - 1] = '\0';
98			else {
99			if ((tbuf = malloc(len + 1)) == NULL)
100			break;
101			memcpy(tbuf, buf, len);
102			tbuf[len] = '\0';
103			buf = tbuf;
104			}
105			if ((cp = strchr(buf, '#')))
106			cp = '\0'; / strip comment */
107			if (buf[0] == '\0' \|\|
108			(cp = devnam = strtok_r(buf, WSPACE, &toklast)) == NULL)
109			continue; /* empty or comment */
110			if (strncmp(devnam, _PATH_DEV, sizeof(_PATH_DEV) - 1) != 0 \|\|
111			(cp = strtok_r(NULL, WSPACE, &toklast)) == NULL \|\|
112			*cp != '0' \|\|
113			sscanf(cp, "%o", &prot) == 0 \|\|
114			prot == 0 \|\|
115			(prot & 0777) != prot \|\|
116			(cp = strtok_r(NULL, WSPACE, &toklast)) == NULL) {
117			syslog(LOG_ERR, "%s: bad entry: %s", _PATH_FBTAB,
118			cp ? cp : "(null)");
119			continue;
120			}
121			if (strcmp(devnam + sizeof(_PATH_DEV) - 1, tty) == 0) {
122			for (cp = strtok_r(cp, ":", &toklast); cp != NULL;
123			cp = strtok_r(NULL, ":", &toklast))
124			login_protect(cp, prot, uid, gid);
125			}
126			}
127			free(tbuf);
128			fclose(fp);
129			}
130
131			/*
132			* login_protect - protect one device entry
133			*/
134			static void
135			login_protect(const char *path, mode_t mask, uid_t uid, gid_t gid)
136			{
137			char buf[PATH_MAX];
138			size_t pathlen = strlen(path);
139			DIR *dir;
140			struct dirent *ent;
141
142			if (pathlen >= sizeof(buf)) {
143			errno = ENAMETOOLONG;
144			syslog(LOG_ERR, "%s: %s: %m", _PATH_FBTAB, path);
145			return;
146			}
147
148			if (strcmp("/*", path + pathlen - 2) != 0) {
149			if (chmod(path, mask) && errno != ENOENT)
150			syslog(LOG_ERR, "%s: chmod(%s): %m", _PATH_FBTAB, path);
151			if (chown(path, uid, gid) && errno != ENOENT)
152			syslog(LOG_ERR, "%s: chown(%s): %m", _PATH_FBTAB, path);
153			} else {
154			/*
155			* This is a wildcard directory (/path/to/whatever/ * ).
156			* Make a copy of path without the trailing '*' (but leave
157			* the trailing '/' so we can append directory entries.)
158			*/
159			memcpy(buf, path, pathlen - 1);
160			buf[pathlen - 1] = '\0';
161			if ((dir = opendir(buf)) == NULL) {
162			syslog(LOG_ERR, "%s: opendir(%s): %m", _PATH_FBTAB,
163			path);
164			return;
165			}
166
167			while ((ent = readdir(dir)) != NULL) {
168			if (strcmp(ent->d_name, ".") != 0 &&
169			strcmp(ent->d_name, "..") != 0) {
170			buf[pathlen - 1] = '\0';
171			if (strlcat(buf, ent->d_name, sizeof(buf))
172			>= sizeof(buf)) {
173			errno = ENAMETOOLONG;
174			syslog(LOG_ERR, "%s: %s: %m",
175			_PATH_FBTAB, path);
176			} else
177			login_protect(buf, mask, uid, gid);
178			}
179			}
180			closedir(dir);
181			}
182			}