CVE-2021-44142: libadouble: add basic cmocka tests

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14914

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
[slow@samba.org: conflict due to missing test in selftest/tests.py]

4 files changed, 399 insertions, 0 deletions

diff --git a/selftest/knownfail.d/samba.unittests.adouble b/selftest/knownfail.d/samba.unittests.adouble
new file mode 100644
index 00000000000..8b0314f2fae
--- /dev/null
+++ b/selftest/knownfail.d/samba.unittests.adouble
@@ -0,0 +1,3 @@
+^samba.unittests.adouble.parse_abouble_finderinfo2\(none\)
+^samba.unittests.adouble.parse_abouble_finderinfo3\(none\)
+^samba.unittests.adouble.parse_abouble_date2\(none\)
diff --git a/selftest/tests.py b/selftest/tests.py
index a2b8bf5c4d5..ac5070f7e5b 100644
--- a/selftest/tests.py
+++ b/selftest/tests.py
@@ -417,3 +417,5 @@ plantestsuite("samba.unittests.test_oLschema2ldif", "none",
 if with_elasticsearch_backend:
     plantestsuite("samba.unittests.mdsparser_es", "none",
                   [os.path.join(bindir(), "default/source3/test_mdsparser_es")] + [configuration])
+plantestsuite("samba.unittests.adouble", "none",
+              [os.path.join(bindir(), "test_adouble")])
diff --git a/source3/lib/test_adouble.c b/source3/lib/test_adouble.c
new file mode 100644
index 00000000000..615c22469c9
--- /dev/null
+++ b/source3/lib/test_adouble.c
@@ -0,0 +1,389 @@
+/*
+ * Unix SMB/CIFS implementation.
+ *
+ * Copyright (C) 2021 Ralph Boehme <slow@samba.org>
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "adouble.c"
+#include <cmocka.h>
+
+static int setup_talloc_context(void **state)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+
+	*state = frame;
+	return 0;
+}
+
+static int teardown_talloc_context(void **state)
+{
+	TALLOC_CTX *frame = *state;
+
+	TALLOC_FREE(frame);
+	return 0;
+}
+
+/*
+ * Basic and sane buffer.
+ */
+static uint8_t ad_basic[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x32,	/* offset */
+	0x00, 0x00, 0x00, 0x20,	/* length */
+	/* adentry 2: Resourcefork */
+	0x00, 0x00, 0x00, 0x02,	/* eid: Resourcefork */
+	0x00, 0x00, 0x00, 0x52,	/* offset */
+	0xff, 0xff, 0xff, 0x00,	/* length */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/*
+ * An empty FinderInfo entry.
+ */
+static uint8_t ad_finderinfo1[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x52,	/* off: points at end of buffer */
+	0x00, 0x00, 0x00, 0x00,	/* len: 0, so off+len don't exceed bufferlen */
+	/* adentry 2: Resourcefork */
+	0x00, 0x00, 0x00, 0x02,	/* eid: Resourcefork */
+	0x00, 0x00, 0x00, 0x52,	/* offset */
+	0xff, 0xff, 0xff, 0x00,	/* length */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/*
+ * A dangerous FinderInfo with correct length exceeding buffer by one byte.
+ */
+static uint8_t ad_finderinfo2[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x33,	/* off: points at beginng of data + 1 */
+	0x00, 0x00, 0x00, 0x20,	/* len: 32, so off+len exceeds bufferlen by 1 */
+	/* adentry 2: Resourcefork */
+	0x00, 0x00, 0x00, 0x02,	/* eid: Resourcefork */
+	0x00, 0x00, 0x00, 0x52,	/* offset */
+	0xff, 0xff, 0xff, 0x00,	/* length */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+static uint8_t ad_finderinfo3[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x33,	/* off: points at beginng of data + 1 */
+	0x00, 0x00, 0x00, 0x1f,	/* len: 31, so off+len don't exceed buf */
+	/* adentry 2: Resourcefork */
+	0x00, 0x00, 0x00, 0x02,	/* eid: Resourcefork */
+	0x00, 0x00, 0x00, 0x52,	/* offset */
+	0xff, 0xff, 0xff, 0x00,	/* length */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/*
+ * A dangerous name entry.
+ */
+static uint8_t ad_name[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x32,	/* offset */
+	0x00, 0x00, 0x00, 0x20,	/* length */
+	/* adentry 2: Name */
+	0x00, 0x00, 0x00, 0x03,	/* eid: Name */
+	0x00, 0x00, 0x00, 0x52,	/* off: points at end of buffer */
+	0x00, 0x00, 0x00, 0x01,	/* len: 1, so off+len exceeds bufferlen */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/*
+ * A empty ADEID_FILEDATESI entry.
+ */
+static uint8_t ad_date1[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x32,	/* offset */
+	0x00, 0x00, 0x00, 0x20,	/* length */
+	/* adentry 2: Dates */
+	0x00, 0x00, 0x00, 0x08,	/* eid: dates */
+	0x00, 0x00, 0x00, 0x52,	/* off: end of buffer */
+	0x00, 0x00, 0x00, 0x00,	/* len: 0, empty entry, valid */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+/*
+ * A dangerous ADEID_FILEDATESI entry, invalid length.
+ */
+static uint8_t ad_date2[] = {
+	0x00, 0x05, 0x16, 0x07, /* Magic */
+	0x00, 0x02, 0x00, 0x00, /* Version */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x00, 0x00, 0x00, /* Filler */
+	0x00, 0x02,             /* Count */
+	/* adentry 1: FinderInfo */
+	0x00, 0x00, 0x00, 0x09,	/* eid: FinderInfo */
+	0x00, 0x00, 0x00, 0x32,	/* offset */
+	0x00, 0x00, 0x00, 0x20,	/* length */
+	/* adentry 2: Dates */
+	0x00, 0x00, 0x00, 0x08,	/* eid: dates */
+	0x00, 0x00, 0x00, 0x43,	/* off: FinderInfo buf but one byte short */
+	0x00, 0x00, 0x00, 0x0f,	/* len: 15, so off+len don't exceed bufferlen */
+	/* FinderInfo data: 32 bytes */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+static struct adouble *parse_adouble(TALLOC_CTX *mem_ctx,
+				     uint8_t *adbuf,
+				     size_t adsize,
+				     off_t filesize)
+{
+	struct adouble *ad = NULL;
+	bool ok;
+
+	ad = talloc_zero(mem_ctx, struct adouble);
+	ad->ad_data = talloc_zero_size(ad, adsize);
+	assert_non_null(ad);
+
+	memcpy(ad->ad_data, adbuf, adsize);
+
+	ok = ad_unpack(ad, 2, filesize);
+	if (!ok) {
+		return NULL;
+	}
+
+	return ad;
+}
+
+static void parse_abouble_basic(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+	char *p = NULL;
+
+	ad = parse_adouble(frame, ad_basic, sizeof(ad_basic), 0xffffff52);
+	assert_non_null(ad);
+
+	p = ad_get_entry(ad, ADEID_FINDERI);
+	assert_non_null(p);
+
+	return;
+}
+
+static void parse_abouble_finderinfo1(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+	char *p = NULL;
+
+	ad = parse_adouble(frame,
+			   ad_finderinfo1,
+			   sizeof(ad_finderinfo1),
+			   0xffffff52);
+	assert_non_null(ad);
+
+	p = ad_get_entry(ad, ADEID_FINDERI);
+	assert_null(p);
+
+	return;
+}
+
+static void parse_abouble_finderinfo2(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+
+	ad = parse_adouble(frame,
+			   ad_finderinfo2,
+			   sizeof(ad_finderinfo2),
+			   0xffffff52);
+	assert_null(ad);
+
+	return;
+}
+
+static void parse_abouble_finderinfo3(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+
+	ad = parse_adouble(frame,
+			   ad_finderinfo3,
+			   sizeof(ad_finderinfo3),
+			   0xffffff52);
+	assert_null(ad);
+
+	return;
+}
+
+static void parse_abouble_name(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+
+	ad = parse_adouble(frame, ad_name, sizeof(ad_name), 0x52);
+	assert_null(ad);
+
+	return;
+}
+
+static void parse_abouble_date1(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+	char *p = NULL;
+
+	ad = parse_adouble(frame, ad_date1, sizeof(ad_date1), 0x52);
+	assert_non_null(ad);
+
+	p = ad_get_entry(ad, ADEID_FILEDATESI);
+	assert_null(p);
+
+	return;
+}
+
+static void parse_abouble_date2(void **state)
+{
+	TALLOC_CTX *frame = *state;
+	struct adouble *ad = NULL;
+
+	ad = parse_adouble(frame, ad_date2, sizeof(ad_date2), 0x52);
+	assert_null(ad);
+
+	return;
+}
+
+int main(int argc, char *argv[])
+{
+	int rc;
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(parse_abouble_basic),
+		cmocka_unit_test(parse_abouble_finderinfo1),
+		cmocka_unit_test(parse_abouble_finderinfo2),
+		cmocka_unit_test(parse_abouble_finderinfo3),
+		cmocka_unit_test(parse_abouble_name),
+		cmocka_unit_test(parse_abouble_date1),
+		cmocka_unit_test(parse_abouble_date2),
+	};
+
+	if (argc == 2) {
+		cmocka_set_test_filter(argv[1]);
+	}
+	cmocka_set_message_output(CM_OUTPUT_SUBUNIT);
+
+	rc = cmocka_run_group_tests(tests,
+				    setup_talloc_context,
+				    teardown_talloc_context);
+
+	return rc;
+}
diff --git a/source3/wscript_build b/source3/wscript_build
index 46c914c7b22..6ac99e81b7f 100644
--- a/source3/wscript_build
+++ b/source3/wscript_build
@@ -1086,6 +1086,11 @@ bld.SAMBA3_SUBSYSTEM('ADOUBLE',
                     source='lib/adouble.c',
                     deps='STRING_REPLACE')
 
+bld.SAMBA3_BINARY('test_adouble',
+                 source='lib/test_adouble.c',
+                 deps='smbd_base STRING_REPLACE cmocka',
+                 for_selftest=True)
+
 bld.SAMBA3_SUBSYSTEM('STRING_REPLACE',
                     source='lib/string_replace.c')