Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/sshd/../auth-rhosts.c	Lines:	0	127	0.0 %
Date:	2017-11-13	Branches:	0	101	0.0 %


/* $OpenBSD: auth-rhosts.c,v 1.48 2016/08/13 17:47:41 markus Exp $ */
/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Rhosts authentication.  This file contains code to check whether to admit
 * the login based on rhosts authentication.  This file also processes
 * /etc/hosts.equiv.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

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

#include <fcntl.h>
#include <netgroup.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>

#include "packet.h"
#include "uidswap.h"
#include "pathnames.h"
#include "log.h"
#include "misc.h"
#include "buffer.h" /* XXX */
#include "key.h" /* XXX */
#include "servconf.h"
#include "canohost.h"
#include "sshkey.h"
#include "hostfile.h"
#include "auth.h"

/* import */
extern ServerOptions options;
extern int use_privsep;

/*
 * This function processes an rhosts-style file (.rhosts, .shosts, or
 * /etc/hosts.equiv).  This returns true if authentication can be granted
 * based on the file, and returns zero otherwise.
 */

static int
check_rhosts_file(const char *filename, const char *hostname,
		  const char *ipaddr, const char *client_user,
		  const char *server_user)
{
	FILE *f;
#define RBUFLN 1024
	char buf[RBUFLN];/* Must not be larger than host, user, dummy below. */
	int fd;
	struct stat st;

	/* Open the .rhosts file, deny if unreadable */
	if ((fd = open(filename, O_RDONLY|O_NONBLOCK)) == -1)
		return 0;
	if (fstat(fd, &st) == -1) {
		close(fd);
		return 0;
	}
	if (!S_ISREG(st.st_mode)) {
		logit("User %s hosts file %s is not a regular file",
		    server_user, filename);
		close(fd);
		return 0;
	}
	unset_nonblock(fd);
	if ((f = fdopen(fd, "r")) == NULL) {
		close(fd);
		return 0;
	}
	while (fgets(buf, sizeof(buf), f)) {
		/* All three must have length >= buf to avoid overflows. */
		char hostbuf[RBUFLN], userbuf[RBUFLN], dummy[RBUFLN];
		char *host, *user, *cp;
		int negated;

		for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
			;
		if (*cp == '#' || *cp == '\n' || !*cp)
			continue;

		/*
		 * NO_PLUS is supported at least on OSF/1.  We skip it (we
		 * don't ever support the plus syntax).
		 */
		if (strncmp(cp, "NO_PLUS", 7) == 0)
			continue;

		/*
		 * This should be safe because each buffer is as big as the
		 * whole string, and thus cannot be overwritten.
		 */
		switch (sscanf(buf, "%1023s %1023s %1023s", hostbuf, userbuf,
		    dummy)) {
		case 0:
			auth_debug_add("Found empty line in %.100s.", filename);
			continue;
		case 1:
			/* Host name only. */
			strlcpy(userbuf, server_user, sizeof(userbuf));
			break;
		case 2:
			/* Got both host and user name. */
			break;
		case 3:
			auth_debug_add("Found garbage in %.100s.", filename);
			continue;
		default:
			/* Weird... */
			continue;
		}

		host = hostbuf;
		user = userbuf;
		negated = 0;

		/* Process negated host names, or positive netgroups. */
		if (host[0] == '-') {
			negated = 1;
			host++;
		} else if (host[0] == '+')
			host++;

		if (user[0] == '-') {
			negated = 1;
			user++;
		} else if (user[0] == '+')
			user++;

		/* Check for empty host/user names (particularly '+'). */
		if (!host[0] || !user[0]) {
			/* We come here if either was '+' or '-'. */
			auth_debug_add("Ignoring wild host/user names "
			    "in %.100s.", filename);
			continue;
		}
		/* Verify that host name matches. */
		if (host[0] == '@') {
			if (!innetgr(host + 1, hostname, NULL, NULL) &&
			    !innetgr(host + 1, ipaddr, NULL, NULL))
				continue;
		} else if (strcasecmp(host, hostname) &&
		    strcmp(host, ipaddr) != 0)
			continue;	/* Different hostname. */

		/* Verify that user name matches. */
		if (user[0] == '@') {
			if (!innetgr(user + 1, NULL, client_user, NULL))
				continue;
		} else if (strcmp(user, client_user) != 0)
			continue;	/* Different username. */

		/* Found the user and host. */
		fclose(f);

		/* If the entry was negated, deny access. */
		if (negated) {
			auth_debug_add("Matched negative entry in %.100s.",
			    filename);
			return 0;
		}
		/* Accept authentication. */
		return 1;
	}

	/* Authentication using this file denied. */
	fclose(f);
	return 0;
}

/*
 * Tries to authenticate the user using the .shosts or .rhosts file. Returns
 * true if authentication succeeds.  If ignore_rhosts is true, only
 * /etc/hosts.equiv will be considered (.rhosts and .shosts are ignored).
 */
int
auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname,
    const char *ipaddr)
{
	char buf[1024];
	struct stat st;
	static const char *rhosts_files[] = {".shosts", ".rhosts", NULL};
	u_int rhosts_file_index;

	debug2("auth_rhosts2: clientuser %s hostname %s ipaddr %s",
	    client_user, hostname, ipaddr);

	/* Switch to the user's uid. */
	temporarily_use_uid(pw);
	/*
	 * Quick check: if the user has no .shosts or .rhosts files and
	 * no system hosts.equiv/shosts.equiv files exist then return
	 * failure immediately without doing costly lookups from name
	 * servers.
	 */
	for (rhosts_file_index = 0; rhosts_files[rhosts_file_index];
	    rhosts_file_index++) {
		/* Check users .rhosts or .shosts. */
		snprintf(buf, sizeof buf, "%.500s/%.100s",
			 pw->pw_dir, rhosts_files[rhosts_file_index]);
		if (stat(buf, &st) >= 0)
			break;
	}
	/* Switch back to privileged uid. */
	restore_uid();

	/*
	 * Deny if The user has no .shosts or .rhosts file and there
	 * are no system-wide files.
	 */
	if (!rhosts_files[rhosts_file_index] &&
	    stat(_PATH_RHOSTS_EQUIV, &st) < 0 &&
	    stat(_PATH_SSH_HOSTS_EQUIV, &st) < 0) {
		debug3("%s: no hosts access files exist", __func__);
		return 0;
	}

	/*
	 * If not logging in as superuser, try /etc/hosts.equiv and
	 * shosts.equiv.
	 */
	if (pw->pw_uid == 0)
		debug3("%s: root user, ignoring system hosts files", __func__);
	else {
		if (check_rhosts_file(_PATH_RHOSTS_EQUIV, hostname, ipaddr,
		    client_user, pw->pw_name)) {
			auth_debug_add("Accepted for %.100s [%.100s] by "
			    "/etc/hosts.equiv.", hostname, ipaddr);
			return 1;
		}
		if (check_rhosts_file(_PATH_SSH_HOSTS_EQUIV, hostname, ipaddr,
		    client_user, pw->pw_name)) {
			auth_debug_add("Accepted for %.100s [%.100s] by "
			    "%.100s.", hostname, ipaddr, _PATH_SSH_HOSTS_EQUIV);
			return 1;
		}
	}

	/*
	 * Check that the home directory is owned by root or the user, and is
	 * not group or world writable.
	 */
	if (stat(pw->pw_dir, &st) < 0) {
		logit("Rhosts authentication refused for %.100s: "
		    "no home directory %.200s", pw->pw_name, pw->pw_dir);
		auth_debug_add("Rhosts authentication refused for %.100s: "
		    "no home directory %.200s", pw->pw_name, pw->pw_dir);
		return 0;
	}
	if (options.strict_modes &&
	    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
	    (st.st_mode & 022) != 0)) {
		logit("Rhosts authentication refused for %.100s: "
		    "bad ownership or modes for home directory.", pw->pw_name);
		auth_debug_add("Rhosts authentication refused for %.100s: "
		    "bad ownership or modes for home directory.", pw->pw_name);
		return 0;
	}
	/* Temporarily use the user's uid. */
	temporarily_use_uid(pw);

	/* Check all .rhosts files (currently .shosts and .rhosts). */
	for (rhosts_file_index = 0; rhosts_files[rhosts_file_index];
	    rhosts_file_index++) {
		/* Check users .rhosts or .shosts. */
		snprintf(buf, sizeof buf, "%.500s/%.100s",
			 pw->pw_dir, rhosts_files[rhosts_file_index]);
		if (stat(buf, &st) < 0)
			continue;

		/*
		 * Make sure that the file is either owned by the user or by
		 * root, and make sure it is not writable by anyone but the
		 * owner.  This is to help avoid novices accidentally
		 * allowing access to their account by anyone.
		 */
		if (options.strict_modes &&
		    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
		    (st.st_mode & 022) != 0)) {
			logit("Rhosts authentication refused for %.100s: bad modes for %.200s",
			    pw->pw_name, buf);
			auth_debug_add("Bad file modes for %.200s", buf);
			continue;
		}
		/*
		 * Check if we have been configured to ignore .rhosts
		 * and .shosts files.
		 */
		if (options.ignore_rhosts) {
			auth_debug_add("Server has been configured to "
			    "ignore %.100s.", rhosts_files[rhosts_file_index]);
			continue;
		}
		/* Check if authentication is permitted by the file. */
		if (check_rhosts_file(buf, hostname, ipaddr,
		    client_user, pw->pw_name)) {
			auth_debug_add("Accepted by %.100s.",
			    rhosts_files[rhosts_file_index]);
			/* Restore the privileged uid. */
			restore_uid();
			auth_debug_add("Accepted host %s ip %s client_user "
			    "%s server_user %s", hostname, ipaddr,
			    client_user, pw->pw_name);
			return 1;
		}
	}

	/* Restore the privileged uid. */
	restore_uid();
	return 0;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: auth-rhosts.c,v 1.48 2016/08/13 17:47:41 markus Exp $ */
2			/*
3			* Author: Tatu Ylonen <ylo@cs.hut.fi>
4			* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5			* All rights reserved
6			* Rhosts authentication. This file contains code to check whether to admit
7			* the login based on rhosts authentication. This file also processes
8			* /etc/hosts.equiv.
9			*
10			* As far as I am concerned, the code I have written for this software
11			* can be used freely for any purpose. Any derived versions of this
12			* software must be clearly marked as such, and if the derived work is
13			* incompatible with the protocol description in the RFC file, it must be
14			* called by a name other than "ssh" or "Secure Shell".
15			*/
16
17			#include <sys/types.h>
18			#include <sys/stat.h>
19
20			#include <fcntl.h>
21			#include <netgroup.h>
22			#include <pwd.h>
23			#include <stdio.h>
24			#include <string.h>
25			#include <stdarg.h>
26			#include <unistd.h>
27
28			#include "packet.h"
29			#include "uidswap.h"
30			#include "pathnames.h"
31			#include "log.h"
32			#include "misc.h"
33			#include "buffer.h" /* XXX */
34			#include "key.h" /* XXX */
35			#include "servconf.h"
36			#include "canohost.h"
37			#include "sshkey.h"
38			#include "hostfile.h"
39			#include "auth.h"
40
41			/* import */
42			extern ServerOptions options;
43			extern int use_privsep;
44
45			/*
46			* This function processes an rhosts-style file (.rhosts, .shosts, or
47			* /etc/hosts.equiv). This returns true if authentication can be granted
48			* based on the file, and returns zero otherwise.
49			*/
50
51			static int
52			check_rhosts_file(const char filename, const char hostname,
53			const char ipaddr, const char client_user,
54			const char *server_user)
55			{
56			FILE *f;
57			#define RBUFLN 1024
58			char buf[RBUFLN];/* Must not be larger than host, user, dummy below. */
59			int fd;
60			struct stat st;
61
62			/* Open the .rhosts file, deny if unreadable */
63			if ((fd = open(filename, O_RDONLY\|O_NONBLOCK)) == -1)
64			return 0;
65			if (fstat(fd, &st) == -1) {
66			close(fd);
67			return 0;
68			}
69			if (!S_ISREG(st.st_mode)) {
70			logit("User %s hosts file %s is not a regular file",
71			server_user, filename);
72			close(fd);
73			return 0;
74			}
75			unset_nonblock(fd);
76			if ((f = fdopen(fd, "r")) == NULL) {
77			close(fd);
78			return 0;
79			}
80			while (fgets(buf, sizeof(buf), f)) {
81			/* All three must have length >= buf to avoid overflows. */
82			char hostbuf[RBUFLN], userbuf[RBUFLN], dummy[RBUFLN];
83			char host, user, *cp;
84			int negated;
85
86			for (cp = buf; cp == ' ' \|\| cp == '\t'; cp++)
87			;
88			if (cp == '#' \|\| cp == '\n' \|\| !*cp)
89			continue;
90
91			/*
92			* NO_PLUS is supported at least on OSF/1. We skip it (we
93			* don't ever support the plus syntax).
94			*/
95			if (strncmp(cp, "NO_PLUS", 7) == 0)
96			continue;
97
98			/*
99			* This should be safe because each buffer is as big as the
100			* whole string, and thus cannot be overwritten.
101			*/
102			switch (sscanf(buf, "%1023s %1023s %1023s", hostbuf, userbuf,
103			dummy)) {
104			case 0:
105			auth_debug_add("Found empty line in %.100s.", filename);
106			continue;
107			case 1:
108			/* Host name only. */
109			strlcpy(userbuf, server_user, sizeof(userbuf));
110			break;
111			case 2:
112			/* Got both host and user name. */
113			break;
114			case 3:
115			auth_debug_add("Found garbage in %.100s.", filename);
116			continue;
117			default:
118			/* Weird... */
119			continue;
120			}
121
122			host = hostbuf;
123			user = userbuf;
124			negated = 0;
125
126			/* Process negated host names, or positive netgroups. */
127			if (host[0] == '-') {
128			negated = 1;
129			host++;
130			} else if (host[0] == '+')
131			host++;
132
133			if (user[0] == '-') {
134			negated = 1;
135			user++;
136			} else if (user[0] == '+')
137			user++;
138
139			/* Check for empty host/user names (particularly '+'). */
140			if (!host[0] \|\| !user[0]) {
141			/* We come here if either was '+' or '-'. */
142			auth_debug_add("Ignoring wild host/user names "
143			"in %.100s.", filename);
144			continue;
145			}
146			/* Verify that host name matches. */
147			if (host[0] == '@') {
148			if (!innetgr(host + 1, hostname, NULL, NULL) &&
149			!innetgr(host + 1, ipaddr, NULL, NULL))
150			continue;
151			} else if (strcasecmp(host, hostname) &&
152			strcmp(host, ipaddr) != 0)
153			continue; /* Different hostname. */
154
155			/* Verify that user name matches. */
156			if (user[0] == '@') {
157			if (!innetgr(user + 1, NULL, client_user, NULL))
158			continue;
159			} else if (strcmp(user, client_user) != 0)
160			continue; /* Different username. */
161
162			/* Found the user and host. */
163			fclose(f);
164
165			/* If the entry was negated, deny access. */
166			if (negated) {
167			auth_debug_add("Matched negative entry in %.100s.",
168			filename);
169			return 0;
170			}
171			/* Accept authentication. */
172			return 1;
173			}
174
175			/* Authentication using this file denied. */
176			fclose(f);
177			return 0;
178			}
179
180			/*
181			* Tries to authenticate the user using the .shosts or .rhosts file. Returns
182			* true if authentication succeeds. If ignore_rhosts is true, only
183			* /etc/hosts.equiv will be considered (.rhosts and .shosts are ignored).
184			*/
185			int
186			auth_rhosts2(struct passwd pw, const char client_user, const char *hostname,
187			const char *ipaddr)
188			{
189			char buf[1024];
190			struct stat st;
191			static const char *rhosts_files[] = {".shosts", ".rhosts", NULL};
192			u_int rhosts_file_index;
193
194			debug2("auth_rhosts2: clientuser %s hostname %s ipaddr %s",
195			client_user, hostname, ipaddr);
196
197			/* Switch to the user's uid. */
198			temporarily_use_uid(pw);
199			/*
200			* Quick check: if the user has no .shosts or .rhosts files and
201			* no system hosts.equiv/shosts.equiv files exist then return
202			* failure immediately without doing costly lookups from name
203			* servers.
204			*/
205			for (rhosts_file_index = 0; rhosts_files[rhosts_file_index];
206			rhosts_file_index++) {
207			/* Check users .rhosts or .shosts. */
208			snprintf(buf, sizeof buf, "%.500s/%.100s",
209			pw->pw_dir, rhosts_files[rhosts_file_index]);
210			if (stat(buf, &st) >= 0)
211			break;
212			}
213			/* Switch back to privileged uid. */
214			restore_uid();
215
216			/*
217			* Deny if The user has no .shosts or .rhosts file and there
218			* are no system-wide files.
219			*/
220			if (!rhosts_files[rhosts_file_index] &&
221			stat(_PATH_RHOSTS_EQUIV, &st) < 0 &&
222			stat(_PATH_SSH_HOSTS_EQUIV, &st) < 0) {
223			debug3("%s: no hosts access files exist", __func__);
224			return 0;
225			}
226
227			/*
228			* If not logging in as superuser, try /etc/hosts.equiv and
229			* shosts.equiv.
230			*/
231			if (pw->pw_uid == 0)
232			debug3("%s: root user, ignoring system hosts files", __func__);
233			else {
234			if (check_rhosts_file(_PATH_RHOSTS_EQUIV, hostname, ipaddr,
235			client_user, pw->pw_name)) {
236			auth_debug_add("Accepted for %.100s [%.100s] by "
237			"/etc/hosts.equiv.", hostname, ipaddr);
238			return 1;
239			}
240			if (check_rhosts_file(_PATH_SSH_HOSTS_EQUIV, hostname, ipaddr,
241			client_user, pw->pw_name)) {
242			auth_debug_add("Accepted for %.100s [%.100s] by "
243			"%.100s.", hostname, ipaddr, _PATH_SSH_HOSTS_EQUIV);
244			return 1;
245			}
246			}
247
248			/*
249			* Check that the home directory is owned by root or the user, and is
250			* not group or world writable.
251			*/
252			if (stat(pw->pw_dir, &st) < 0) {
253			logit("Rhosts authentication refused for %.100s: "
254			"no home directory %.200s", pw->pw_name, pw->pw_dir);
255			auth_debug_add("Rhosts authentication refused for %.100s: "
256			"no home directory %.200s", pw->pw_name, pw->pw_dir);
257			return 0;
258			}
259			if (options.strict_modes &&
260			((st.st_uid != 0 && st.st_uid != pw->pw_uid) \|\|
261			(st.st_mode & 022) != 0)) {
262			logit("Rhosts authentication refused for %.100s: "
263			"bad ownership or modes for home directory.", pw->pw_name);
264			auth_debug_add("Rhosts authentication refused for %.100s: "
265			"bad ownership or modes for home directory.", pw->pw_name);
266			return 0;
267			}
268			/* Temporarily use the user's uid. */
269			temporarily_use_uid(pw);
270
271			/* Check all .rhosts files (currently .shosts and .rhosts). */
272			for (rhosts_file_index = 0; rhosts_files[rhosts_file_index];
273			rhosts_file_index++) {
274			/* Check users .rhosts or .shosts. */
275			snprintf(buf, sizeof buf, "%.500s/%.100s",
276			pw->pw_dir, rhosts_files[rhosts_file_index]);
277			if (stat(buf, &st) < 0)
278			continue;
279
280			/*
281			* Make sure that the file is either owned by the user or by
282			* root, and make sure it is not writable by anyone but the
283			* owner. This is to help avoid novices accidentally
284			* allowing access to their account by anyone.
285			*/
286			if (options.strict_modes &&
287			((st.st_uid != 0 && st.st_uid != pw->pw_uid) \|\|
288			(st.st_mode & 022) != 0)) {
289			logit("Rhosts authentication refused for %.100s: bad modes for %.200s",
290			pw->pw_name, buf);
291			auth_debug_add("Bad file modes for %.200s", buf);
292			continue;
293			}
294			/*
295			* Check if we have been configured to ignore .rhosts
296			* and .shosts files.
297			*/
298			if (options.ignore_rhosts) {
299			auth_debug_add("Server has been configured to "
300			"ignore %.100s.", rhosts_files[rhosts_file_index]);
301			continue;
302			}
303			/* Check if authentication is permitted by the file. */
304			if (check_rhosts_file(buf, hostname, ipaddr,
305			client_user, pw->pw_name)) {
306			auth_debug_add("Accepted by %.100s.",
307			rhosts_files[rhosts_file_index]);
308			/* Restore the privileged uid. */
309			restore_uid();
310			auth_debug_add("Accepted host %s ip %s client_user "
311			"%s server_user %s", hostname, ipaddr,
312			client_user, pw->pw_name);
313			return 1;
314			}
315			}
316
317			/* Restore the privileged uid. */
318			restore_uid();
319			return 0;
320			}