Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../match.c	Lines:	54	116	46.6 %
Date:	2017-11-07	Branches:	39	94	41.5 %


/* $OpenBSD: match.c,v 1.37 2017/03/10 04:24:55 djm Exp $ */
/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Simple pattern matching, with '*' and '?' as wildcards.
 *
 * 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".
 */
/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "xmalloc.h"
#include "match.h"
#include "misc.h"

/*
 * Returns true if the given string matches the pattern (which may contain ?
 * and * as wildcards), and zero if it does not match.
 */

int
match_pattern(const char *s, const char *pattern)
{
	for (;;) {
		/* If at end of pattern, accept if also at end of string. */
		if (!*pattern)
			return !*s;

		if (*pattern == '*') {
			/* Skip the asterisk. */
			pattern++;

			/* If at end of pattern, accept immediately. */
			if (!*pattern)
				return 1;

			/* If next character in pattern is known, optimize. */
			if (*pattern != '?' && *pattern != '*') {
				/*
				 * Look instances of the next character in
				 * pattern, and try to match starting from
				 * those.
				 */
				for (; *s; s++)
					if (*s == *pattern &&
					    match_pattern(s + 1, pattern + 1))
						return 1;
				/* Failed. */
				return 0;
			}
			/*
			 * Move ahead one character at a time and try to
			 * match at each position.
			 */
			for (; *s; s++)
				if (match_pattern(s, pattern))
					return 1;
			/* Failed. */
			return 0;
		}
		/*
		 * There must be at least one more character in the string.
		 * If we are at the end, fail.
		 */
		if (!*s)
			return 0;

		/* Check if the next character of the string is acceptable. */
		if (*pattern != '?' && *pattern != *s)
			return 0;

		/* Move to the next character, both in string and in pattern. */
		s++;
		pattern++;
	}
	/* NOTREACHED */
}

/*
 * Tries to match the string against the
 * comma-separated sequence of subpatterns (each possibly preceded by ! to
 * indicate negation).  Returns -1 if negation matches, 1 if there is
 * a positive match, 0 if there is no match at all.
 */
int
match_pattern_list(const char *string, const char *pattern, int dolower)
{
	char sub[1024];
	int negated;
	int got_positive;
	u_int i, subi, len = strlen(pattern);

	got_positive = 0;
	for (i = 0; i < len;) {
		/* Check if the subpattern is negated. */
		if (pattern[i] == '!') {
			negated = 1;
			i++;
		} else
			negated = 0;

		/*
		 * Extract the subpattern up to a comma or end.  Convert the
		 * subpattern to lowercase.
		 */
		for (subi = 0;
		    i < len && subi < sizeof(sub) - 1 && pattern[i] != ',';
		    subi++, i++)
			sub[subi] = dolower && isupper((u_char)pattern[i]) ?
			    tolower((u_char)pattern[i]) : pattern[i];
		/* If subpattern too long, return failure (no match). */
		if (subi >= sizeof(sub) - 1)
			return 0;

		/* If the subpattern was terminated by a comma, then skip it. */
		if (i < len && pattern[i] == ',')
			i++;

		/* Null-terminate the subpattern. */
		sub[subi] = '\0';

		/* Try to match the subpattern against the string. */
		if (match_pattern(string, sub)) {
			if (negated)
				return -1;		/* Negative */
			else
				got_positive = 1;	/* Positive */
		}
	}

	/*
	 * Return success if got a positive match.  If there was a negative
	 * match, we have already returned -1 and never get here.
	 */
	return got_positive;
}

/*
 * Tries to match the host name (which must be in all lowercase) against the
 * comma-separated sequence of subpatterns (each possibly preceded by ! to
 * indicate negation).  Returns -1 if negation matches, 1 if there is
 * a positive match, 0 if there is no match at all.
 */
int
match_hostname(const char *host, const char *pattern)
{
	char *hostcopy = xstrdup(host);
	int r;

	lowercase(hostcopy);
	r = match_pattern_list(hostcopy, pattern, 1);
	free(hostcopy);
	return r;
}

/*
 * returns 0 if we get a negative match for the hostname or the ip
 * or if we get no match at all.  returns -1 on error, or 1 on
 * successful match.
 */
int
match_host_and_ip(const char *host, const char *ipaddr,
    const char *patterns)
{
	int mhost, mip;

	if ((mip = addr_match_list(ipaddr, patterns)) == -2)
		return -1; /* error in ipaddr match */
	else if (host == NULL || ipaddr == NULL || mip == -1)
		return 0; /* negative ip address match, or testing pattern */

	/* negative hostname match */
	if ((mhost = match_hostname(host, patterns)) == -1)
		return 0;
	/* no match at all */
	if (mhost == 0 && mip == 0)
		return 0;
	return 1;
}

/*
 * Match user, user@host_or_ip, user@host_or_ip_list against pattern.
 * If user, host and ipaddr are all NULL then validate pattern/
 * Returns -1 on invalid pattern, 0 on no match, 1 on match.
 */
int
match_user(const char *user, const char *host, const char *ipaddr,
    const char *pattern)
{
	char *p, *pat;
	int ret;

	/* test mode */
	if (user == NULL && host == NULL && ipaddr == NULL) {
		if ((p = strchr(pattern, '@')) != NULL &&
		    match_host_and_ip(NULL, NULL, p + 1) < 0)
			return -1;
		return 0;
	}

	if ((p = strchr(pattern,'@')) == NULL)
		return match_pattern(user, pattern);

	pat = xstrdup(pattern);
	p = strchr(pat, '@');
	*p++ = '\0';

	if ((ret = match_pattern(user, pat)) == 1)
		ret = match_host_and_ip(host, ipaddr, p);
	free(pat);

	return ret;
}

/*
 * Returns first item from client-list that is also supported by server-list,
 * caller must free the returned string.
 */
#define	MAX_PROP	40
#define	SEP	","
char *
match_list(const char *client, const char *server, u_int *next)
{
	char *sproposals[MAX_PROP];
	char *c, *s, *p, *ret, *cp, *sp;
	int i, j, nproposals;

	c = cp = xstrdup(client);
	s = sp = xstrdup(server);

	for ((p = strsep(&sp, SEP)), i=0; p && *p != '\0';
	    (p = strsep(&sp, SEP)), i++) {
		if (i < MAX_PROP)
			sproposals[i] = p;
		else
			break;
	}
	nproposals = i;

	for ((p = strsep(&cp, SEP)), i=0; p && *p != '\0';
	    (p = strsep(&cp, SEP)), i++) {
		for (j = 0; j < nproposals; j++) {
			if (strcmp(p, sproposals[j]) == 0) {
				ret = xstrdup(p);
				if (next != NULL)
					*next = (cp == NULL) ?
					    strlen(c) : (u_int)(cp - c);
				free(c);
				free(s);
				return ret;
			}
		}
	}
	if (next != NULL)
		*next = strlen(c);
	free(c);
	free(s);
	return NULL;
}

/*
 * Filters a comma-separated list of strings, excluding any entry matching
 * the 'filter' pattern list. Caller must free returned string.
 */
char *
match_filter_list(const char *proposal, const char *filter)
{
	size_t len = strlen(proposal) + 1;
	char *fix_prop = malloc(len);
	char *orig_prop = strdup(proposal);
	char *cp, *tmp;

	if (fix_prop == NULL || orig_prop == NULL) {
		free(orig_prop);
		free(fix_prop);
		return NULL;
	}

	tmp = orig_prop;
	*fix_prop = '\0';
	while ((cp = strsep(&tmp, ",")) != NULL) {
		if (match_pattern_list(cp, filter, 0) != 1) {
			if (*fix_prop != '\0')
				strlcat(fix_prop, ",", len);
			strlcat(fix_prop, cp, len);
		}
	}
	free(orig_prop);
	return fix_prop;
}



Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: match.c,v 1.37 2017/03/10 04:24:55 djm 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			* Simple pattern matching, with '*' and '?' as wildcards.
7			*
8			* As far as I am concerned, the code I have written for this software
9			* can be used freely for any purpose. Any derived versions of this
10			* software must be clearly marked as such, and if the derived work is
11			* incompatible with the protocol description in the RFC file, it must be
12			* called by a name other than "ssh" or "Secure Shell".
13			*/
14			/*
15			* Copyright (c) 2000 Markus Friedl. All rights reserved.
16			*
17			* Redistribution and use in source and binary forms, with or without
18			* modification, are permitted provided that the following conditions
19			* are met:
20			* 1. Redistributions of source code must retain the above copyright
21			* notice, this list of conditions and the following disclaimer.
22			* 2. Redistributions in binary form must reproduce the above copyright
23			* notice, this list of conditions and the following disclaimer in the
24			* documentation and/or other materials provided with the distribution.
25			*
26			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36			*/
37
38			#include <sys/types.h>
39
40			#include <ctype.h>
41			#include <stdlib.h>
42			#include <string.h>
43			#include <stdio.h>
44
45			#include "xmalloc.h"
46			#include "match.h"
47			#include "misc.h"
48
49			/*
50			* Returns true if the given string matches the pattern (which may contain ?
51			* and * as wildcards), and zero if it does not match.
52			*/
53
54			int
55			match_pattern(const char s, const char pattern)
56			{
57		219	for (;;) {
58			/* If at end of pattern, accept if also at end of string. */
59	✗✓	196	if (!*pattern)
60			return !*s;
61
62	✓✓	196	if (pattern == '') {
63			/* Skip the asterisk. */
64		1	pattern++;
65
66			/* If at end of pattern, accept immediately. */
67	✓✗	1	if (!*pattern)
68		1	return 1;
69
70			/* If next character in pattern is known, optimize. */
71			if (pattern != '?' && pattern != '*') {
72			/*
73			* Look instances of the next character in
74			* pattern, and try to match starting from
75			* those.
76			*/
77			for (; *s; s++)
78			if (s == pattern &&
79			match_pattern(s + 1, pattern + 1))
80			return 1;
81			/* Failed. */
82			return 0;
83			}
84			/*
85			* Move ahead one character at a time and try to
86			* match at each position.
87			*/
88			for (; *s; s++)
89			if (match_pattern(s, pattern))
90			return 1;
91			/* Failed. */
92			return 0;
93			}
94			/*
95			* There must be at least one more character in the string.
96			* If we are at the end, fail.
97			*/
98	✗✓	195	if (!*s)
99			return 0;
100
101			/* Check if the next character of the string is acceptable. */
102	✓✗✓✓	390	if (pattern != '?' && pattern != *s)
103		22	return 0;
104
105			/* Move to the next character, both in string and in pattern. */
106		173	s++;
107		173	pattern++;
108			}
109			/* NOTREACHED */
110		23	}
111
112			/*
113			* Tries to match the string against the
114			* comma-separated sequence of subpatterns (each possibly preceded by ! to
115			* indicate negation). Returns -1 if negation matches, 1 if there is
116			* a positive match, 0 if there is no match at all.
117			*/
118			int
119			match_pattern_list(const char string, const char pattern, int dolower)
120			{
121		28	char sub[1024];
122			int negated;
123			int got_positive;
124		14	u_int i, subi, len = strlen(pattern);
125
126			got_positive = 0;
127	✓✓	51	for (i = 0; i < len;) {
128			/* Check if the subpattern is negated. */
129	✗✓	23	if (pattern[i] == '!') {
130			negated = 1;
131			i++;
132			} else
133			negated = 0;
134
135			/*
136			* Extract the subpattern up to a comma or end. Convert the
137			* subpattern to lowercase.
138			*/
139	✓✓	606	for (subi = 0;
140	✓✓✓✗	902	i < len && subi < sizeof(sub) - 1 && pattern[i] != ',';
141		287	subi++, i++)
142	✗✓✗✗	861	sub[subi] = dolower && isupper((u_char)pattern[i]) ?
143		287	tolower((u_char)pattern[i]) : pattern[i];
144			/* If subpattern too long, return failure (no match). */
145	✗✓	23	if (subi >= sizeof(sub) - 1)
146			return 0;
147
148			/* If the subpattern was terminated by a comma, then skip it. */
149	✓✓✓✗	32	if (i < len && pattern[i] == ',')
150		9	i++;
151
152			/* Null-terminate the subpattern. */
153		23	sub[subi] = '\0';
154
155			/* Try to match the subpattern against the string. */
156	✓✓	23	if (match_pattern(string, sub)) {
157	✗✓	1	if (negated)
158			return -1; /* Negative */
159			else
160			got_positive = 1; /* Positive */
161		1	}
162			}
163
164			/*
165			* Return success if got a positive match. If there was a negative
166			* match, we have already returned -1 and never get here.
167			*/
168		14	return got_positive;
169		14	}
170
171			/*
172			* Tries to match the host name (which must be in all lowercase) against the
173			* comma-separated sequence of subpatterns (each possibly preceded by ! to
174			* indicate negation). Returns -1 if negation matches, 1 if there is
175			* a positive match, 0 if there is no match at all.
176			*/
177			int
178			match_hostname(const char host, const char pattern)
179			{
180			char *hostcopy = xstrdup(host);
181			int r;
182
183			lowercase(hostcopy);
184			r = match_pattern_list(hostcopy, pattern, 1);
185			free(hostcopy);
186			return r;
187			}
188
189			/*
190			* returns 0 if we get a negative match for the hostname or the ip
191			* or if we get no match at all. returns -1 on error, or 1 on
192			* successful match.
193			*/
194			int
195			match_host_and_ip(const char host, const char ipaddr,
196			const char *patterns)
197			{
198			int mhost, mip;
199
200			if ((mip = addr_match_list(ipaddr, patterns)) == -2)
201			return -1; /* error in ipaddr match */
202			else if (host == NULL \|\| ipaddr == NULL \|\| mip == -1)
203			return 0; /* negative ip address match, or testing pattern */
204
205			/* negative hostname match */
206			if ((mhost = match_hostname(host, patterns)) == -1)
207			return 0;
208			/* no match at all */
209			if (mhost == 0 && mip == 0)
210			return 0;
211			return 1;
212			}
213
214			/*
215			* Match user, user@host_or_ip, user@host_or_ip_list against pattern.
216			* If user, host and ipaddr are all NULL then validate pattern/
217			* Returns -1 on invalid pattern, 0 on no match, 1 on match.
218			*/
219			int
220			match_user(const char user, const char host, const char *ipaddr,
221			const char *pattern)
222			{
223			char p, pat;
224			int ret;
225
226			/* test mode */
227			if (user == NULL && host == NULL && ipaddr == NULL) {
228			if ((p = strchr(pattern, '@')) != NULL &&
229			match_host_and_ip(NULL, NULL, p + 1) < 0)
230			return -1;
231			return 0;
232			}
233
234			if ((p = strchr(pattern,'@')) == NULL)
235			return match_pattern(user, pattern);
236
237			pat = xstrdup(pattern);
238			p = strchr(pat, '@');
239			*p++ = '\0';
240
241			if ((ret = match_pattern(user, pat)) == 1)
242			ret = match_host_and_ip(host, ipaddr, p);
243			free(pat);
244
245			return ret;
246			}
247
248			/*
249			* Returns first item from client-list that is also supported by server-list,
250			* caller must free the returned string.
251			*/
252			#define MAX_PROP 40
253			#define SEP ","
254			char *
255			match_list(const char client, const char server, u_int *next)
256			{
257		22	char *sproposals[MAX_PROP];
258		11	char c, s, p, ret, cp, sp;
259			int i, j, nproposals;
260
261		11	c = cp = xstrdup(client);
262		11	s = sp = xstrdup(server);
263
264	✓✓✓✗	214	for ((p = strsep(&sp, SEP)), i=0; p && *p != '\0';
265		48	(p = strsep(&sp, SEP)), i++) {
266		48	if (i < MAX_PROP)
267		48	sproposals[i] = p;
268			else
269			break;
270			}
271			nproposals = i;
272
273	✓✓✓✗	87	for ((p = strsep(&cp, SEP)), i=0; p && *p != '\0';
274		19	(p = strsep(&cp, SEP)), i++) {
275	✓✓	162	for (j = 0; j < nproposals; j++) {
276	✓✓	62	if (strcmp(p, sproposals[j]) == 0) {
277		8	ret = xstrdup(p);
278	✓✓	8	if (next != NULL)
279	✓✓	6	*next = (cp == NULL) ?
280		2	strlen(c) : (u_int)(cp - c);
281		8	free(c);
282		8	free(s);
283		8	return ret;
284			}
285			}
286			}
287	✗✓	3	if (next != NULL)
288			*next = strlen(c);
289		3	free(c);
290		3	free(s);
291		3	return NULL;
292		11	}
293
294			/*
295			* Filters a comma-separated list of strings, excluding any entry matching
296			* the 'filter' pattern list. Caller must free returned string.
297			*/
298			char *
299			match_filter_list(const char proposal, const char filter)
300			{
301			size_t len = strlen(proposal) + 1;
302			char *fix_prop = malloc(len);
303			char *orig_prop = strdup(proposal);
304			char cp, tmp;
305
306			if (fix_prop == NULL \|\| orig_prop == NULL) {
307			free(orig_prop);
308			free(fix_prop);
309			return NULL;
310			}
311
312			tmp = orig_prop;
313			*fix_prop = '\0';
314			while ((cp = strsep(&tmp, ",")) != NULL) {
315			if (match_pattern_list(cp, filter, 0) != 1) {
316			if (*fix_prop != '\0')
317			strlcat(fix_prop, ",", len);
318			strlcat(fix_prop, cp, len);
319			}
320			}
321			free(orig_prop);
322			return fix_prop;
323			}
324