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Resolves: CVE-2023-28321 - fix host name wildcard checking

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Jacek Migacz 2023-06-27 19:42:23 +02:00
parent d0d9c1f19b
commit bb4d7d8d9f
2 changed files with 309 additions and 0 deletions
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304
0031-curl-7.76.1-CVE-2023-28321.patch Normal file
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@ -0,0 +1,304 @@
From 199f2d440d8659b42670c1b796220792b01a97bf Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 24 Apr 2023 21:07:02 +0200
Subject: [PATCH] hostcheck: fix host name wildcard checking
The leftmost "label" of the host name can now only match against single
'*'. Like the browsers have worked for a long time.
- extended unit test 1397 for this
- move some SOURCE variables from unit/Makefile.am to unit/Makefile.inc
Reported-by: Hiroki Kurosawa
Closes #11018
---
lib/hostcheck.c | 50 +++++++--------
tests/data/test1397 | 10 ++-
tests/unit/Makefile.am | 94 ----------------------------
tests/unit/Makefile.inc | 94 ++++++++++++++++++++++++++++
tests/unit/unit1397.c | 134 ++++++++++++++++++++++++----------------
5 files changed, 202 insertions(+), 180 deletions(-)
diff --git a/lib/hostcheck.c b/lib/hostcheck.c
index e827dc58f378c..d061c6356f97f 100644
--- a/lib/hostcheck.c
+++ b/lib/hostcheck.c
@@ -43,6 +43,17 @@
/* The last #include file should be: */
#include "memdebug.h"
+/* check the two input strings with given length, but do not
+ assume they end in nul-bytes */
+static int pmatch(const char *hostname, size_t hostlen,
+ const char *pattern, size_t patternlen)
+{
+ if(hostlen != patternlen)
+ return CURL_HOST_NOMATCH;
+ return strncasecompare(hostname, pattern, hostlen) ?
+ CURL_HOST_MATCH : CURL_HOST_NOMATCH;
+}
+
/*
* Match a hostname against a wildcard pattern.
* E.g.
@@ -65,26 +76,27 @@
static int hostmatch(char *hostname, char *pattern)
{
- const char *pattern_label_end, *pattern_wildcard, *hostname_label_end;
- int wildcard_enabled;
- size_t prefixlen, suffixlen;
+ size_t hostlen, patternlen;
+ const char *pattern_label_end;
struct in_addr ignored;
#ifdef ENABLE_IPV6
struct sockaddr_in6 si6;
#endif
+ DEBUGASSERT(pattern);
+ DEBUGASSERT(hostname);
+
+ hostlen = strlen(hostname);
+ patternlen = strlen(pattern);
+
/* normalize pattern and hostname by stripping off trailing dots */
- size_t len = strlen(hostname);
- if(hostname[len-1]=='.')
- hostname[len-1] = 0;
- len = strlen(pattern);
- if(pattern[len-1]=='.')
- pattern[len-1] = 0;
-
- pattern_wildcard = strchr(pattern, '*');
- if(pattern_wildcard == NULL)
- return strcasecompare(pattern, hostname) ?
- CURL_HOST_MATCH : CURL_HOST_NOMATCH;
+ if(hostname[hostlen-1]=='.')
+ hostname[hostlen-1] = 0;
+ if(pattern[patternlen-1]=='.')
+ pattern[patternlen-1] = 0;
+
+ if(strncmp(pattern, "*.", 2))
+ return pmatch(hostname, hostlen, pattern, patternlen);
/* detect IP address as hostname and fail the match if so */
if(Curl_inet_pton(AF_INET, hostname, &ignored) > 0)
@@ -96,34 +108,20 @@ static int hostmatch(char *hostname, char *pattern)
/* We require at least 2 dots in pattern to avoid too wide wildcard
match. */
- wildcard_enabled = 1;
pattern_label_end = strchr(pattern, '.');
- if(pattern_label_end == NULL || strchr(pattern_label_end + 1, '.') == NULL ||
- pattern_wildcard > pattern_label_end ||
- strncasecompare(pattern, "xn--", 4)) {
- wildcard_enabled = 0;
+ if(pattern_label_end == NULL ||
+ (strrchr(pattern, '.') == pattern_label_end))
+ return pmatch(pattern, patternlen, hostname, hostlen);
+
+ const char *hostname_label_end = strchr(hostname, '.');
+ if(hostname_label_end != NULL) {
+ size_t skiphost = hostname_label_end - hostname;
+ size_t skiplen = pattern_label_end - pattern;
+ return pmatch(hostname_label_end, hostlen - skiphost,
+ pattern_label_end, patternlen - skiplen);
}
- if(!wildcard_enabled)
- return strcasecompare(pattern, hostname) ?
- CURL_HOST_MATCH : CURL_HOST_NOMATCH;
-
- hostname_label_end = strchr(hostname, '.');
- if(hostname_label_end == NULL ||
- !strcasecompare(pattern_label_end, hostname_label_end))
- return CURL_HOST_NOMATCH;
- /* The wildcard must match at least one character, so the left-most
- label of the hostname is at least as large as the left-most label
- of the pattern. */
- if(hostname_label_end - hostname < pattern_label_end - pattern)
- return CURL_HOST_NOMATCH;
-
- prefixlen = pattern_wildcard - pattern;
- suffixlen = pattern_label_end - (pattern_wildcard + 1);
- return strncasecompare(pattern, hostname, prefixlen) &&
- strncasecompare(pattern_wildcard + 1, hostname_label_end - suffixlen,
- suffixlen) ?
- CURL_HOST_MATCH : CURL_HOST_NOMATCH;
+ return CURL_HOST_NOMATCH;
}
int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
diff --git a/tests/data/test1397 b/tests/data/test1397
index 84f962abebee3..f31b2c2a3f330 100644
--- a/tests/data/test1397
+++ b/tests/data/test1397
@@ -2,8 +2,7 @@
<info>
<keywords>
unittest
-ssl
-wildcard
+Curl_cert_hostcheck
</keywords>
</info>
@@ -15,9 +14,9 @@ none
<features>
unittest
</features>
- <name>
-Check wildcard certificate matching function Curl_cert_hostcheck
- </name>
+<name>
+Curl_cert_hostcheck unit tests
+</name>
</client>
</testcase>
diff --git a/tests/unit/unit1397.c b/tests/unit/unit1397.c
index 2f3d3aa4d09e1..3ae75618d5d10 100644
--- a/tests/unit/unit1397.c
+++ b/tests/unit/unit1397.c
@@ -21,8 +21,6 @@
***************************************************************************/
#include "curlcheck.h"
-#include "hostcheck.h" /* from the lib dir */
-
static CURLcode unit_setup(void)
{
return CURLE_OK;
@@ -30,50 +28,93 @@ static CURLcode unit_setup(void)
static void unit_stop(void)
{
- /* done before shutting down and exiting */
}
-UNITTEST_START
-
/* only these backends define the tested functions */
-#if defined(USE_OPENSSL) || defined(USE_GSKIT)
-
- /* here you start doing things and checking that the results are good */
+#if defined(USE_OPENSSL) || defined(USE_GSKIT) || defined(USE_SCHANNEL)
+#include "hostcheck.h"
+struct testcase {
+ const char *host;
+ const char *pattern;
+ bool match;
+};
-fail_unless(Curl_cert_hostcheck("www.example.com", "www.example.com"),
- "good 1");
-fail_unless(Curl_cert_hostcheck("*.example.com", "www.example.com"),
- "good 2");
-fail_unless(Curl_cert_hostcheck("xxx*.example.com", "xxxwww.example.com"),
- "good 3");
-fail_unless(Curl_cert_hostcheck("f*.example.com", "foo.example.com"),
- "good 4");
-fail_unless(Curl_cert_hostcheck("192.168.0.0", "192.168.0.0"),
- "good 5");
-
-fail_if(Curl_cert_hostcheck("xxx.example.com", "www.example.com"), "bad 1");
-fail_if(Curl_cert_hostcheck("*", "www.example.com"), "bad 2");
-fail_if(Curl_cert_hostcheck("*.*.com", "www.example.com"), "bad 3");
-fail_if(Curl_cert_hostcheck("*.example.com", "baa.foo.example.com"), "bad 4");
-fail_if(Curl_cert_hostcheck("f*.example.com", "baa.example.com"), "bad 5");
-fail_if(Curl_cert_hostcheck("*.com", "example.com"), "bad 6");
-fail_if(Curl_cert_hostcheck("*fail.com", "example.com"), "bad 7");
-fail_if(Curl_cert_hostcheck("*.example.", "www.example."), "bad 8");
-fail_if(Curl_cert_hostcheck("*.example.", "www.example"), "bad 9");
-fail_if(Curl_cert_hostcheck("", "www"), "bad 10");
-fail_if(Curl_cert_hostcheck("*", "www"), "bad 11");
-fail_if(Curl_cert_hostcheck("*.168.0.0", "192.168.0.0"), "bad 12");
-fail_if(Curl_cert_hostcheck("www.example.com", "192.168.0.0"), "bad 13");
-
-#ifdef ENABLE_IPV6
-fail_if(Curl_cert_hostcheck("*::3285:a9ff:fe46:b619",
- "fe80::3285:a9ff:fe46:b619"), "bad 14");
-fail_unless(Curl_cert_hostcheck("fe80::3285:a9ff:fe46:b619",
- "fe80::3285:a9ff:fe46:b619"), "good 6");
-#endif
+static struct testcase tests[] = {
+ {"", "", FALSE},
+ {"a", "", FALSE},
+ {"", "b", FALSE},
+ {"a", "b", FALSE},
+ {"aa", "bb", FALSE},
+ {"\xff", "\xff", TRUE},
+ {"aa.aa.aa", "aa.aa.bb", FALSE},
+ {"aa.aa.aa", "aa.aa.aa", TRUE},
+ {"aa.aa.aa", "*.aa.bb", FALSE},
+ {"aa.aa.aa", "*.aa.aa", TRUE},
+ {"192.168.0.1", "192.168.0.1", TRUE},
+ {"192.168.0.1", "*.168.0.1", FALSE},
+ {"192.168.0.1", "*.0.1", FALSE},
+ {"h.ello", "*.ello", FALSE},
+ {"h.ello.", "*.ello", FALSE},
+ {"h.ello", "*.ello.", FALSE},
+ {"h.e.llo", "*.e.llo", TRUE},
+ {"h.e.llo", " *.e.llo", FALSE},
+ {" h.e.llo", "*.e.llo", TRUE},
+ {"h.e.llo.", "*.e.llo", TRUE},
+ {"*.e.llo.", "*.e.llo", TRUE},
+ {"************.e.llo.", "*.e.llo", TRUE},
+ {"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB"
+ "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC"
+ "DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD"
+ "EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE"
+ ".e.llo.", "*.e.llo", TRUE},
+ {"\xfe\xfe.e.llo.", "*.e.llo", TRUE},
+ {"h.e.llo.", "*.e.llo.", TRUE},
+ {"h.e.llo", "*.e.llo.", TRUE},
+ {".h.e.llo", "*.e.llo.", FALSE},
+ {"h.e.llo", "*.*.llo.", FALSE},
+ {"h.e.llo", "h.*.llo", FALSE},
+ {"h.e.llo", "h.e.*", FALSE},
+ {"hello", "*.ello", FALSE},
+ {"hello", "**llo", FALSE},
+ {"bar.foo.example.com", "*.example.com", FALSE},
+ {"foo.example.com", "*.example.com", TRUE},
+ {"baz.example.net", "b*z.example.net", FALSE},
+ {"foobaz.example.net", "*baz.example.net", FALSE},
+ {"xn--l8j.example.local", "x*.example.local", FALSE},
+ {"xn--l8j.example.net", "*.example.net", TRUE},
+ {"xn--l8j.example.net", "*j.example.net", FALSE},
+ {"xn--l8j.example.net", "xn--l8j.example.net", TRUE},
+ {"xn--l8j.example.net", "xn--l8j.*.net", FALSE},
+ {"xl8j.example.net", "*.example.net", TRUE},
+ {"fe80::3285:a9ff:fe46:b619", "*::3285:a9ff:fe46:b619", FALSE},
+ {"fe80::3285:a9ff:fe46:b619", "fe80::3285:a9ff:fe46:b619", TRUE},
+ {NULL, NULL, FALSE}
+};
-#endif
+UNITTEST_START
+{
+ int i;
+ for(i = 0; tests[i].host; i++) {
+ if(tests[i].match != Curl_cert_hostcheck(tests[i].pattern,
+ strlen(tests[i].pattern),
+ tests[i].host,
+ strlen(tests[i].host))) {
+ fprintf(stderr,
+ "HOST: %s\n"
+ "PTRN: %s\n"
+ "did %sMATCH\n",
+ tests[i].host,
+ tests[i].pattern,
+ tests[i].match ? "NOT ": "");
+ unitfail++;
+ }
+ }
+}
+UNITTEST_STOP
+#else
- /* you end the test code like this: */
+UNITTEST_START
UNITTEST_STOP
+#endif

5
curl.spec
View File

@ -92,6 +92,9 @@ Patch29: 0029-curl-7.76.1-CVE-2023-27538.patch
# unify the upload/method handling (CVE-2023-28322) # unify the upload/method handling (CVE-2023-28322)
Patch30: 0030-curl-7.76.1-CVE-2023-28322.patch Patch30: 0030-curl-7.76.1-CVE-2023-28322.patch
# fix host name wildcard checking
Patch31: 0031-curl-7.76.1-CVE-2023-28321.patch
# patch making libcurl multilib ready # patch making libcurl multilib ready
Patch101: 0101-curl-7.32.0-multilib.patch Patch101: 0101-curl-7.32.0-multilib.patch
@ -296,6 +299,7 @@ be installed.
%patch28 -p1 %patch28 -p1
%patch29 -p1 %patch29 -p1
%patch30 -p1 %patch30 -p1
%patch31 -p1
# Fedora patches # Fedora patches
%patch101 -p1 %patch101 -p1
@ -523,6 +527,7 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
%changelog %changelog
* Mon Jun 12 2023 Jacek Migacz <jmigacz@redhat.com> - 7.76.1-26 * Mon Jun 12 2023 Jacek Migacz <jmigacz@redhat.com> - 7.76.1-26
- unify the upload/method handling (CVE-2023-28322) - unify the upload/method handling (CVE-2023-28322)
- fix host name wildcard checking (CVE-2023-28321)
* Wed Apr 12 2023 Kamil Dudka <kdudka@redhat.com> - 7.76.1-25 * Wed Apr 12 2023 Kamil Dudka <kdudka@redhat.com> - 7.76.1-25
- adapt the fix of CVE-2023-27535 for RHEL 9 curl - adapt the fix of CVE-2023-27535 for RHEL 9 curl