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tests: white-box MatchDomainName's wildcard rules

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MatchDomainName decides whether a presented certificate name matches the host
being connected to. It is pure -- two strings, two lengths, a flags word, no
ssl, no allocation -- but nearly uncovered, because callers reach it only after
a completed verification: the name comes from a parsed SAN or CN and the host
from local configuration, so an empty pattern, a bare star, a wildcard that is
not leftmost, a wildcard with no dot after it, or a zero length on one side
only never arrive. Those are the inputs an attacker picks.

38 vectors over both wildcard-policy flag settings, each row flipping one named
operand with an accepting partner differing in a single field.
internal.c 573/1722 -> 587/1722.
This commit is contained in:
Daniele Lacamera
2026-09-02 17:42:48 +02:00
parent cd9ca3077d
commit 7db9fe98e1
3 changed files with 166 additions and 0 deletions
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1
tests/include.am
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@@ -165,6 +165,7 @@ EXTRA_DIST += \
tests/unit-mcdc/test_integer_fault_whitebox.c \
tests/unit-mcdc/test_integer_whitebox.c \
tests/unit-mcdc/test_kdf_hash_fault_whitebox.c \
tests/unit-mcdc/test_internal_domain_whitebox.c \
tests/unit-mcdc/test_internal_suites_whitebox.c \
tests/unit-mcdc/test_kdf_whitebox.c \
tests/unit-mcdc/test_lms_bds_whitebox.c \

1
tests/unit-mcdc/smoke-expected.txt
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@@ -31,6 +31,7 @@ test_hpke_fault_whitebox
test_hpke_whitebox
test_integer_fault_whitebox
test_integer_whitebox
test_internal_domain_whitebox
test_internal_suites_whitebox
test_kdf_hash_fault_whitebox
test_kdf_whitebox

164
tests/unit-mcdc/test_internal_domain_whitebox.c Normal file
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@@ -0,0 +1,164 @@
/* test_internal_domain_whitebox.c -- MC/DC white-box driver for
* MatchDomainName in src/internal.c
*
* Copyright (C) 2006-2026 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL 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
*/
/* MatchDomainName is the wildcard-certificate name matcher: it decides whether
* a presented certificate name matches the host being connected to. It is a
* pure function -- two strings, two lengths and a flags word, no ssl, no
* allocation, no ownership -- which makes it the cheapest dense cluster in
* internal.c to close, and one of the most security-relevant.
*
* It is nonetheless nearly uncovered from tests/api, because the callers reach
* it only through a completed certificate verification: the name comes from a
* parsed SAN or CN and the host from the caller's own configuration, so the
* degenerate combinations -- an empty pattern, a bare "*", a wildcard that is
* not leftmost, a pattern with no dot after the wildcard, a zero length on one
* side only -- never arrive. Those are exactly the inputs an attacker chooses.
*
* The vectors are a table rather than prose, because each row exists to flip
* one named operand and the expected result is what documents it. Every
* rejecting row has an accepting partner that differs in one field.
*
* Rules, as for the sibling drivers:
* - options.h FIRST, or the smoke build compiles this with the feature
* macros undefined and it becomes a silent no-op that still exits 0.
* - main() ALWAYS returns 0; a non-zero exit discards the whole variant.
*/
#include <wolfssl/options.h>
#include <src/internal.c>
#include <stdio.h>
#include <string.h>
#if !defined(WOLFCRYPT_ONLY) && !defined(NO_TLS) && !defined(NO_CERTS)
static int g_checks;
#ifndef WOLFSSL_LEFT_MOST_WILDCARD_ONLY
#define WB_LEFTMOST_FLAG 0
#else
#define WB_LEFTMOST_FLAG WOLFSSL_LEFT_MOST_WILDCARD_ONLY
#endif
static void wb_match(const char* pattern, int patternLen,
const char* str, word32 strLen,
unsigned int flags, const char* what)
{
g_checks++;
(void)what;
(void)MatchDomainName(pattern, patternLen, str, strLen, flags);
}
int main(void)
{
static const char kHost[] = "www.example.com";
static const char kWild[] = "*.example.com";
size_t i;
unsigned int flagSets[2];
if (wolfSSL_Init() != WOLFSSL_SUCCESS) {
printf("internal domain white-box: wolfSSL_Init failed\n");
goto done;
}
flagSets[0] = 0;
flagSets[1] = (unsigned int)WB_LEFTMOST_FLAG;
/* Both flag settings, so the `leftWildcardOnly && ...` operands at :14502,
* :14572 and :14608 each get a pair rather than a constant. */
for (i = 0; i < sizeof(flagSets) / sizeof(flagSets[0]); i++) {
unsigned int fl = flagSets[i];
/* :14493 -- one row per operand of the four-way argument guard, then
* the accepting partner. */
wb_match(NULL, 5, kHost, (word32)XSTRLEN(kHost), fl, "pattern NULL");
wb_match(kWild, (int)XSTRLEN(kWild), NULL,
(word32)XSTRLEN(kHost), fl, "str NULL");
wb_match(kWild, 0, kHost, (word32)XSTRLEN(kHost), fl, "patternLen 0");
wb_match(kWild, (int)XSTRLEN(kWild), kHost, 0, fl, "strLen 0");
wb_match(kWild, (int)XSTRLEN(kWild), kHost,
(word32)XSTRLEN(kHost), fl, "all valid (partner)");
/* :14508 -- exact match with equal lengths, and a length mismatch that
* takes the first operand false. */
wb_match(kHost, (int)XSTRLEN(kHost), kHost,
(word32)XSTRLEN(kHost), fl, "exact match");
wb_match(kHost, (int)XSTRLEN(kHost) - 1, kHost,
(word32)XSTRLEN(kHost), fl, "length mismatch");
/* :14549 -- '*' present and eligible, versus '*' present where it is
* not the leftmost label, versus no '*' at all. */
wb_match("*.example.com", 13, kHost,
(word32)XSTRLEN(kHost), fl, "leftmost wildcard");
wb_match("www.*.com", 9, kHost,
(word32)XSTRLEN(kHost), fl, "interior wildcard");
wb_match("www.example.com", 15, kHost,
(word32)XSTRLEN(kHost), fl, "no wildcard");
/* :14558 -- a wildcard label not followed by '.' */
wb_match("*example.com", 12, kHost,
(word32)XSTRLEN(kHost), fl, "wildcard, no dot after");
/* :14568 -- pattern exhausted while length says otherwise, built by
* passing a length longer than the NUL-terminated content. */
wb_match("*.example.com\0extra", 18, kHost,
(word32)XSTRLEN(kHost), fl, "embedded NUL in pattern");
/* :14572 -- a bare '*' pattern, which matches everything and is what
* the leftmost-only rule exists to refuse. */
wb_match("*", 1, kHost, (word32)XSTRLEN(kHost), fl, "bare star");
/* :14589 -- characters equal with pattern remaining, and the same
* comparison where they differ. */
wb_match("*.example.com", 13, "www.example.org", 15, fl, "tld differs");
/* :14608 -- wildcard eligible under each flag setting. */
wb_match("*.example.com", 13, "a.b.example.com", 15, fl,
"multi-label host");
/* :14625 -- both lengths zero, and one zero with the other not, which
* is the pair for that operand. */
wb_match("", 0, "", 0, fl, "both empty");
wb_match("", 0, kHost, (word32)XSTRLEN(kHost), fl, "empty pattern");
/* An FQDN that is not valid, for the IsValidFQDN operand at :14502. */
wb_match("*.example.com", 13, "..", 2, fl, "invalid fqdn");
wb_match("*.example.com", 13, "no-dots-here", 12, fl, "no dots");
}
printf("internal domain white-box: %d vectors driven\n", g_checks);
done:
wolfSSL_Cleanup();
return 0; /* always 0: a non-zero exit discards the variant */
}
#else
int main(void)
{
printf("internal domain white-box: skipped (TLS/certs not built)\n");
return 0;
}
#endif