+/* $OpenBSD: match.c,v 1.27 2008/06/10 23:06:19 djm Exp $ */
/*
- *
- * match.c
- *
* Author: Tatu Ylonen <ylo@cs.hut.fi>
- *
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- *
- * Created: Thu Jun 22 01:17:50 1995 ylo
- *
* 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 "includes.h"
-RCSID("$Id$");
-#include "ssh.h"
+#include <sys/types.h>
-/* Returns true if the given string matches the pattern (which may contain
- ? and * as wildcards), and zero if it does not match. */
+#include <ctype.h>
+#include <string.h>
-int
+#include "xmalloc.h"
+#include "match.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 (!*pattern)
return !*s;
- /* Process '*'. */
if (*pattern == '*') {
/* Skip the asterisk. */
pattern++;
/* 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. */
+ /*
+ * 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))
/* Failed. */
return 0;
}
- /* Move ahead one character at a time and try to
- match at each position. */
+ /*
+ * 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. */
+ /*
+ * 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. */
+ /* 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. */
+ /* 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, u_int len,
+ int dolower)
+{
+ char sub[1024];
+ int negated;
+ int got_positive;
+ u_int i, subi;
+
+ 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(pattern[i]) ?
+ (char)tolower(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, skip the comma. */
+ 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, u_int len)
+{
+ return match_pattern_list(host, pattern, len, 1);
+}
+
+/*
+ * 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;
+
+ /* error in ipaddr match */
+ if ((mip = addr_match_list(ipaddr, patterns)) == -2)
+ return -1;
+ else if (mip == -1) /* negative ip address match */
+ return 0;
+
+ /* negative hostname match */
+ if ((mhost = match_hostname(host, patterns, strlen(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
+ */
+int
+match_user(const char *user, const char *host, const char *ipaddr,
+ const char *pattern)
+{
+ char *p, *pat;
+ int ret;
+
+ 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);
+ xfree(pat);
+
+ return ret;
+}
+
+/*
+ * Returns first item from client-list that is also supported by server-list,
+ * caller must xfree() 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);
+ xfree(c);
+ xfree(s);
+ return ret;
+ }
+ }
+ }
+ if (next != NULL)
+ *next = strlen(c);
+ xfree(c);
+ xfree(s);
+ return NULL;
+}
andersk / openssh.git / blobdiff