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check_regex.c
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check_regex.c
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/*
* Unit tests for regular expression processing.
*
* Copyright (C) 2008 Sourcefire, Inc.
*
* Authors: Török Edvin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <check.h>
#include "../libclamav/clamav.h"
#include "../libclamav/others.h"
#include "../libclamav/mbox.h"
#include "../libclamav/message.h"
#include "../libclamav/htmlnorm.h"
#include "../libclamav/phishcheck.h"
#include "../libclamav/regex_suffix.h"
#include "../libclamav/regex_list.h"
#include "../libclamav/phish_domaincheck_db.h"
#include "../libclamav/phish_whitelist.h"
#include "checks.h"
static size_t cb_called = 0;
static int cb_fail(void *cbdata, const char *suffix, size_t len, const struct regex_list *regex)
{
fail("this pattern is not supposed to have a suffix");
return -1;
}
static int cb_expect_single(void *cbdata, const char *suffix, size_t len, const struct regex_list *regex)
{
const char *expected = cbdata;
cb_called++;
fail_unless_fmt(suffix && strcmp(suffix, expected) == 0,
"suffix mismatch, was: %s, expected: %s\n", suffix, expected);
return 0;
}
static struct regex_list regex;
START_TEST (empty)
{
const char pattern[] = "";
int rc;
regex_t *preg;
errmsg_expected();
preg = malloc(sizeof(*regex.preg));
fail_unless(!!preg, "malloc");
rc = cli_regex2suffix(pattern, preg, cb_fail, NULL);
free(preg);
fail_unless(rc == REG_EMPTY, "empty pattern");
fail_unless(cb_called == 0, "callback shouldn't be called");
}
END_TEST
START_TEST (one)
{
char pattern[] = "a";
int rc;
regex_t *preg;
preg = malloc(sizeof(*regex.preg));
fail_unless(!!preg, "malloc");
rc = cli_regex2suffix(pattern, preg, cb_expect_single, pattern);
fail_unless(rc == 0, "single character pattern");
cli_regfree(preg);
free(preg);
fail_unless(cb_called == 1, "callback should be called once");
}
END_TEST
static const char *ex1[] =
{"com|de","moc","ed",NULL};
static const char *ex2[] =
{"xd|(a|e)bc","dx","cba","cbe",NULL};
static const char **tests[] = {
ex1,
ex2
};
static int cb_expect_multi(void *cbdata, const char *suffix, size_t len, const struct regex_list *r)
{
const char **exp = cbdata;
fail_unless(!!exp, "expected data");
exp++;
fail_unless_fmt(!!*exp, "expected no suffix, got: %s\n",suffix);
fail_unless_fmt(!!exp[cb_called], "expected less suffixes, but already got: %d\n", cb_called);
fail_unless_fmt(strcmp(exp[cb_called], suffix) == 0,
"suffix mismatch, was: %s, expected: %s\n",suffix, exp[cb_called]);
fail_unless_fmt(strlen(suffix) == len, "incorrect suffix len, expected: %d, got: %d\n", strlen(suffix), len);
cb_called++;
return 0;
}
#ifdef CHECK_HAVE_LOOPS
START_TEST (test_suffix)
{
int rc;
regex_t *preg;
const char *pattern = tests[_i][0];
size_t n=0;
const char **p=tests[_i];
fail_unless(!!pattern, "test pattern");
preg = malloc(sizeof(*regex.preg));
fail_unless(!!preg, "malloc");
rc = cli_regex2suffix(pattern, preg, cb_expect_multi, tests[_i]);
fail_unless(rc == 0, "single character pattern");
cli_regfree(preg);
free(preg);
p++;
while(*p++) n++;
fail_unless_fmt(cb_called == n,
"suffix number mismatch, expected: %d, was: %d\n", n, cb_called);
}
END_TEST
#endif /* CHECK_HAVE_LOOPS */
static void setup(void)
{
cb_called = 0;
}
static void teardown(void)
{
}
static struct regex_matcher matcher;
static void rsetup(void)
{
int rc;
#ifdef USE_MPOOL
matcher.mempool = mpool_create();
#endif
rc = init_regex_list(&matcher, 1);
fail_unless(rc == 0, "init_regex_list");
}
static void rteardown(void)
{
regex_list_done(&matcher);
#ifdef USE_MPOOL
mpool_destroy(matcher.mempool);
#endif
}
static const struct rtest {
const char *pattern;/* NULL if not meant for whitelist testing */
const char *realurl;
const char *displayurl;
int result;/* 0 - phish, 1 - whitelisted, 2 - clean,
3 - blacklisted if 2nd db is loaded,
4 - invalid regex*/
} rtests[] = {
{NULL,"http://fake.example.com", "http://[email protected]/", 0},
{NULL,"http://fake.example.com", "[email protected]", 0},
{NULL,"http://fake.example.com", "[email protected]", 2},
{NULL,"http://fake.example.com","=====key.com",0},
{NULL,"http://key.com","=====key.com",2},
{NULL," http://key.com","=====key.com",2},
{NULL,"http://[email protected]","key.com",0},
{NULL," http://[email protected]","key.com",0},
{NULL," http://[email protected] ","key.com",0},
/* entry taken from .wdb with a / appended */
{".+\\.ebayrtm\\.com([/?].*)?:.+\\.ebay\\.(de|com|co\\.uk)([/?].*)?/",
"http://srx.main.ebayrtm.com",
"pages.ebay.de",
1 /* should be whitelisted */},
{".+\\.ebayrtm\\.com([/?].*)?:.+\\.ebay\\.(de|com|co\\.uk)([/?].*)?/",
"http://srx.main.ebayrtm.com.evil.example.com",
"pages.ebay.de",
0},
{".+\\.ebayrtm\\.com([/?].*)?:.+\\.ebay\\.(de|com|co\\.uk)([/?].*)?/",
"www.www.ebayrtm.com?somecgi",
"www.ebay.com/something",1},
{NULL,
"http://key.com","go to key.com",2
},
{":.+\\.paypal\\.(com|de|fr|it)([/?].*)?:.+\\.ebay\\.(at|be|ca|ch|co\\.uk|de|es|fr|ie|in|it|nl|ph|pl|com(\\.(au|cn|hk|my|sg))?)([/?].*)?/",
"http://www.paypal.com", "pics.ebay.com", 1},
{NULL, "http://somefakeurl.example.com","someotherdomain-key.com",2},
{NULL, "http://somefakeurl.example.com","someotherdomain.key.com",0},
{NULL, "http://1.test.example.com/something","test",3},
{NULL, "http://1.test.example.com/2","test",3},
{NULL, "http://[email protected]/2","test",3},
{NULL, "http://[email protected]/2/test","test",3},
{NULL, "http://[email protected]/","test",3},
{NULL, "http://x.exe","http:///x.exe",2},
{".+\\.ebayrtm\\.com([/?].*)?:[^.]+\\.ebay\\.(de|com|co\\.uk)/",
"http://srx.main.ebayrtm.com",
"pages.ebay.de",
1 /* should be whitelisted */},
{".+\\.ebayrtm\\.com([/?].*)?:.+[r-t]\\.ebay\\.(de|com|co\\.uk)/",
"http://srx.main.ebayrtm.com",
"pages.ebay.de",
1 /* should be whitelisted */},
{".+\\.ebayrtm\\.com([/?].*)?:.+[r-t]\\.ebay\\.(de|com|co\\.uk)/",
"http://srx.main.ebayrtm.com",
"pages.ebay.de",
1 /* should be whitelisted */},
{"[t-","","",4},
{NULL,"http://co.uk","http:// co.uk",2},
{NULL,"http://co.uk"," ",2},
{NULL,"127.0.0.1","pages.ebay.de",2},
{".+\\.ebayrtm\\.com([/?].*)?:.+\\.ebay\\.(de|com|co\\.uk)([/?].*)?/",
"http://[email protected]","pages.ebay.de",0},
{NULL,"http://key.com","https://key.com",0},
{NULL,"http://key.com%00fake.example.com","https://key.com",0},
{NULL,"http://key.com.example.com","key.com.invalid",0}
};
#ifdef CHECK_HAVE_LOOPS
START_TEST (regex_list_match_test)
{
const char *info;
const struct rtest *rtest = &rtests[_i];
char *pattern, *realurl;
int rc;
if(!rtest->pattern) {
fail_unless(rtest->result != 1,
"whitelist test must have pattern set");
/* this test entry is not meant for whitelist testing */
return;
}
fail_unless(rtest->result == 0 || rtest->result == 1 || rtest->result==4,
"whitelist test result must be either 0 or 1 or 4");
pattern = cli_strdup(rtest->pattern);
fail_unless(!!pattern, "cli_strdup");
rc = regex_list_add_pattern(&matcher, pattern);
if(rtest->result == 4) {
fail_unless(rc, "regex_list_add_pattern should return error");
free(pattern);
return;
} else
fail_unless(rc == 0,"regex_list_add_pattern");
free(pattern);
matcher.list_loaded = 1;
rc = cli_build_regex_list(&matcher);
fail_unless(rc == 0,"cli_build_regex_list");
fail_unless(is_regex_ok(&matcher),"is_regex_ok");
realurl = cli_strdup(rtest->realurl);
rc = regex_list_match(&matcher, realurl, rtest->displayurl, NULL, 1, &info, 1);
fail_unless(rc == rtest->result,"regex_list_match");
/* regex_list_match is not supposed to modify realurl in this case */
fail_unless(!strcmp(realurl, rtest->realurl), "realurl altered");
free(realurl);
}
END_TEST
#endif /* CHECK_HAVE_LOOPS */
static struct cl_engine *engine;
static int loaded_2 = 0;
static void psetup_impl(int load2)
{
FILE *f;
int rc;
unsigned signo=0;
engine = cl_engine_new();
fail_unless(!!engine , "cl_engine_new");
phishing_init(engine);
fail_unless(!!engine->phishcheck, "phishing_init");
rc = init_domainlist(engine);
fail_unless(rc == 0,"init_domainlist");
f = fdopen(open_testfile("input/daily.pdb"),"r");
fail_unless(!!f, "fopen daily.pdb");
rc = load_regex_matcher(engine, engine->domainlist_matcher, f, &signo, 0, 0, NULL, 1);
fail_unless(rc == 0, "load_regex_matcher");
fclose(f);
fail_unless_fmt(signo == 201, "Incorrect number of signatures: %u, expected %u", signo, 201);
if(load2) {
f = fdopen(open_testfile("input/daily.gdb"),"r");
fail_unless(!!f, "fopen daily.gdb");
signo = 0;
rc = load_regex_matcher(engine, engine->domainlist_matcher, f, &signo, 0, 0, NULL, 1);
fail_unless(rc == 0, "load_regex_matcher");
fclose(f);
fail_unless_fmt(signo == 4, "Incorrect number of signatures: %u, expected %u", signo, 4);
}
loaded_2 = load2;
rc = init_whitelist(engine);
fail_unless(rc == 0,"init_whitelist");
f = fdopen(open_testfile("input/daily.wdb"),"r");
signo = 0;
rc = load_regex_matcher(engine, engine->whitelist_matcher, f, &signo, 0, 1, NULL, 1);
fail_unless(rc == 0,"load_regex_matcher");
fclose(f);
fail_unless_fmt(signo == 31, "Incorrect number of signatures: %u, expected %u", signo, 31);
rc = cli_build_regex_list(engine->whitelist_matcher);
fail_unless(rc == 0,"cli_build_regex_list");
rc = cli_build_regex_list(engine->domainlist_matcher);
fail_unless(rc == 0,"cli_build_regex_list");
fail_unless(is_regex_ok(engine->whitelist_matcher),"is_regex_ok");
fail_unless(is_regex_ok(engine->domainlist_matcher),"is_regex_ok");
}
static void psetup(void)
{
psetup_impl(0);
}
static void psetup2(void)
{
psetup_impl(1);
}
static void pteardown(void)
{
if(engine) {
cl_engine_free(engine);
}
engine = NULL;
}
static void do_phishing_test(const struct rtest *rtest)
{
char *realurl;
cli_ctx ctx;
const char *virname = NULL;
tag_arguments_t hrefs;
int rc;
memset(&ctx, 0, sizeof(ctx));
realurl = cli_strdup(rtest->realurl);
fail_unless(!!realurl, "cli_strdup");
hrefs.count = 1;
hrefs.value = cli_malloc(sizeof(*hrefs.value));
fail_unless(!!hrefs.value, "cli_malloc");
hrefs.value[0] = (unsigned char*)realurl;
hrefs.contents = cli_malloc(sizeof(*hrefs.contents));
fail_unless(!!hrefs.contents, "cli_malloc");
hrefs.tag = cli_malloc(sizeof(*hrefs.tag));
fail_unless(!!hrefs.tag, "cli_malloc");
hrefs.tag[0] = (unsigned char*)cli_strdup("href");
hrefs.contents[0] = (unsigned char*)cli_strdup(rtest->displayurl);
ctx.engine = engine;
ctx.virname = &virname;
rc = phishingScan(&ctx, &hrefs);
html_tag_arg_free(&hrefs);
fail_unless(rc == CL_CLEAN,"phishingScan");
switch(rtest->result) {
case 0:
fail_unless_fmt(ctx.found_possibly_unwanted,
"this should be phishing, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 1:
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be whitelisted, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 2:
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be clean, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 3:
if(!loaded_2)
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be clean, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
else {
fail_unless_fmt(ctx.found_possibly_unwanted,
"this should be blacklisted, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
if (*ctx.virname)
fail_unless_fmt(!strstr((const char*)*ctx.virname,"Blacklisted"),
"should be blacklisted, but is: %s\n", ctx.virname);
}
break;
}
}
static void do_phishing_test_allscan(const struct rtest *rtest)
{
char *realurl;
cli_ctx ctx;
const char *virname = NULL;
tag_arguments_t hrefs;
int rc;
memset(&ctx, 0, sizeof(ctx));
realurl = cli_strdup(rtest->realurl);
fail_unless(!!realurl, "cli_strdup");
hrefs.count = 1;
hrefs.value = cli_malloc(sizeof(*hrefs.value));
fail_unless(!!hrefs.value, "cli_malloc");
hrefs.value[0] = (unsigned char*)realurl;
hrefs.contents = cli_malloc(sizeof(*hrefs.contents));
fail_unless(!!hrefs.contents, "cli_malloc");
hrefs.tag = cli_malloc(sizeof(*hrefs.tag));
fail_unless(!!hrefs.tag, "cli_malloc");
hrefs.tag[0] = (unsigned char*)cli_strdup("href");
hrefs.contents[0] = (unsigned char*)cli_strdup(rtest->displayurl);
ctx.engine = engine;
ctx.virname = &virname;
ctx.options |= CL_SCAN_ALLMATCHES;
rc = phishingScan(&ctx, &hrefs);
html_tag_arg_free(&hrefs);
fail_unless(rc == CL_CLEAN,"phishingScan");
switch(rtest->result) {
case 0:
fail_unless_fmt(ctx.found_possibly_unwanted,
"this should be phishing, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 1:
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be whitelisted, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 2:
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be clean, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
break;
case 3:
if(!loaded_2)
fail_unless_fmt(!ctx.found_possibly_unwanted,
"this should be clean, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
else {
fail_unless_fmt(ctx.found_possibly_unwanted,
"this should be blacklisted, realURL: %s, displayURL: %s",
rtest->realurl, rtest->displayurl);
if (*ctx.virname)
fail_unless_fmt(!strstr((const char*)*ctx.virname,"Blacklisted"),
"should be blacklisted, but is: %s\n", ctx.virname);
}
break;
}
if (ctx.num_viruses)
free((void *)ctx.virname);
}
#ifdef CHECK_HAVE_LOOPS
START_TEST (phishingScan_test)
{
do_phishing_test(&rtests[_i]);
}
END_TEST
START_TEST (phishingScan_test_allscan)
{
do_phishing_test_allscan(&rtests[_i]);
}
END_TEST
#endif
#ifdef CHECK_HAVE_LOOPS
static struct uc {
const char *in;
const char *host;
const char *path;
} uc[] = {
{":example/%25%32%35", "example/", "%25"},
{":example/%25%32%35%25%32%35", "example/", "%25%25"},
{":example/abc%25%32%35asd", "example/", "abc%25asd"},
{":www.example.com/","www.example.com/",""},
{":%31%32%37%2e%30%2e%30%2e%31/%2E%73%65%63%75%72%65/%77%77%77%2e%65%78%61%6d%70%6c%65%2e%63%6f%6d/",
"127.0.0.1/",".secure/www.example.com/"},
{":127.0.0.1/uploads/%20%20%20%20/.verify/.blah=abcd-ef=gh/",
"127.0.0.1/","uploads/%20%20%20%20/.verify/.blah=abcd-ef=gh/"},
{"http://example%23.com/%61%40%62%252B",
"example%23.com/", "a@b+"},
{"http://example.com/blah/..","example.com/",""},
{"http://example.com/blah/../x","example.com/","x"},
{"http://example.com/./a","example.com/","a"}
};
START_TEST (test_url_canon)
{
char urlbuff[1024+3];
char *host = NULL;
const char *path = NULL;
size_t host_len, path_len;
struct uc *u = &uc[_i];
cli_url_canon(u->in, strlen(u->in), urlbuff, sizeof(urlbuff), &host, &host_len, &path, &path_len);
fail_unless(!!host && !!path, "null results\n");
fail_unless_fmt(!strcmp(u->host, host), "host incorrect: %s\n", host);
fail_unless_fmt(!strcmp(u->path, path), "path incorrect: %s\n", path);
}
END_TEST
static struct regex_test {
const char *regex;
const char *text;
int match;
} rg[] = {
{"\\.exe$", "test.exe", 1},
{"\\.exe$", "test.eXe", 0},
{"(?i)\\.exe$", "test.exe", 1},
{"(?i)\\.exe$", "test.eXe", 1}
};
START_TEST (test_regexes)
{
regex_t reg;
struct regex_test *tst = &rg[_i];
int match;
fail_unless(cli_regcomp(®, tst->regex, REG_EXTENDED | REG_NOSUB) == 0, "cli_regcomp");
match = (cli_regexec(®, tst->text, 0, NULL, 0) == REG_NOMATCH) ? 0 : 1;
fail_unless_fmt(match == tst->match, "cli_regexec failed for %s and %s\n", tst->regex, tst->text);
cli_regfree(®);
}
END_TEST
#endif
START_TEST(phishing_fake_test)
{
char buf[4096];
FILE *f = fdopen(open_testfile("input/daily.pdb"),"r");
fail_unless(!!f,"fopen daily.pdb");
while(fgets(buf, sizeof(buf), f)) {
struct rtest rtest;
const char *pdb = strchr(buf,':');
fail_unless(!!pdb, "missing : in pdb");
rtest.realurl = pdb;
rtest.displayurl = pdb;
rtest.result = 2;
do_phishing_test(&rtest);
rtest.realurl = "http://fake.example.com";
rtest.result = 0;
do_phishing_test(&rtest);
}
fclose(f);
}
END_TEST
START_TEST(phishing_fake_test_allscan)
{
char buf[4096];
FILE *f = fdopen(open_testfile("input/daily.pdb"),"r");
fail_unless(!!f,"fopen daily.pdb");
while(fgets(buf, sizeof(buf), f)) {
struct rtest rtest;
const char *pdb = strchr(buf,':');
fail_unless(!!pdb, "missing : in pdb");
rtest.realurl = pdb;
rtest.displayurl = pdb;
rtest.result = 2;
do_phishing_test_allscan(&rtest);
rtest.realurl = "http://fake.example.com";
rtest.result = 0;
do_phishing_test_allscan(&rtest);
}
fclose(f);
}
END_TEST
Suite *test_regex_suite(void)
{
Suite *s = suite_create("regex");
TCase *tc_api, *tc_matching, *tc_phish, *tc_phish2, *tc_regex;
tc_api = tcase_create("cli_regex2suffix");
suite_add_tcase(s, tc_api);
tcase_add_checked_fixture (tc_api, setup, teardown);
tcase_add_test(tc_api, empty);
tcase_add_test(tc_api, one);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_api, test_suffix, 0, sizeof(tests)/sizeof(tests[0]));
#endif
tc_matching = tcase_create("regex_list");
suite_add_tcase(s, tc_matching);
tcase_add_checked_fixture (tc_matching, rsetup, rteardown);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_matching, regex_list_match_test, 0, sizeof(rtests)/sizeof(rtests[0]));
#endif
tc_phish = tcase_create("phishingScan");
suite_add_tcase(s, tc_phish);
tcase_add_unchecked_fixture(tc_phish, psetup, pteardown);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_phish, phishingScan_test, 0, sizeof(rtests)/sizeof(rtests[0]));
tcase_add_loop_test(tc_phish, phishingScan_test_allscan, 0, sizeof(rtests)/sizeof(rtests[0]));
#endif
tcase_add_test(tc_phish, phishing_fake_test);
tcase_add_test(tc_phish, phishing_fake_test_allscan);
tc_phish2 = tcase_create("phishingScan with 2 dbs");
suite_add_tcase(s, tc_phish2);
tcase_add_unchecked_fixture(tc_phish2, psetup2, pteardown);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_phish2, phishingScan_test, 0, sizeof(rtests)/sizeof(rtests[0]));
tcase_add_loop_test(tc_phish2, phishingScan_test_allscan, 0, sizeof(rtests)/sizeof(rtests[0]));
#endif
tcase_add_test(tc_phish2, phishing_fake_test);
tcase_add_test(tc_phish2, phishing_fake_test_allscan);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_phish, test_url_canon, 0, sizeof(uc)/sizeof(uc[0]));
#endif
tc_regex = tcase_create("cli_regcomp/execute");
suite_add_tcase(s, tc_regex);
#ifdef CHECK_HAVE_LOOPS
tcase_add_loop_test(tc_regex, test_regexes, 0, sizeof(rg)/sizeof(rg[0]));
#endif
return s;
}