272 lines
7.2 KiB
C
272 lines
7.2 KiB
C
/* $NetBSD: match.c,v 1.3 2004/11/03 21:01:45 dsl 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 "includes.h"
|
|
RCSID("$OpenBSD: match.c,v 1.19 2002/03/01 13:12:10 markus Exp $");
|
|
__RCSID("$NetBSD: match.c,v 1.3 2004/11/03 21:01:45 dsl Exp $");
|
|
|
|
#include "match.h"
|
|
#include "xmalloc.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, 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((unsigned char)pattern[i]) ?
|
|
tolower((unsigned 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, 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 otherwise.
|
|
*/
|
|
int
|
|
match_host_and_ip(const char *host, const char *ipaddr,
|
|
const char *patterns)
|
|
{
|
|
int mhost, mip;
|
|
|
|
/* negative ipaddr match */
|
|
if ((mip = match_hostname(ipaddr, patterns, strlen(patterns))) == -1)
|
|
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) : cp - c;
|
|
xfree(c);
|
|
xfree(s);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
if (next != NULL)
|
|
*next = strlen(c);
|
|
xfree(c);
|
|
xfree(s);
|
|
return NULL;
|
|
}
|