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samba/SOURCES/CVE-2021-44142-v4.14.patch

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From 2f7332f6c283fbedbd859c79a3f74ca6e07aad46 Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Thu, 13 Jan 2022 16:48:01 +0100
Subject: [PATCH 1/5] CVE-2021-44142: libadouble: add defines for icon lengths
From https://www.ietf.org/rfc/rfc1740.txt
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14914
Signed-off-by: Ralph Boehme <slow@samba.org>
---
source3/lib/adouble.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/source3/lib/adouble.h b/source3/lib/adouble.h
index 90a825c502e0..e3b9263a1f9a 100644
--- a/source3/lib/adouble.h
+++ b/source3/lib/adouble.h
@@ -101,6 +101,8 @@ typedef enum {ADOUBLE_META, ADOUBLE_RSRC} adouble_type_t;
#define ADEDLEN_MACFILEI 4
#define ADEDLEN_PRODOSFILEI 8
#define ADEDLEN_MSDOSFILEI 2
+#define ADEDLEN_ICONBW 128
+#define ADEDLEN_ICONCOL 1024
#define ADEDLEN_DID 4
#define ADEDLEN_PRIVDEV 8
#define ADEDLEN_PRIVINO 8
--
2.34.1
From fc20cb8268af1203a331ba142b630d4dfb613478 Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Sat, 20 Nov 2021 16:36:42 +0100
Subject: [PATCH 2/5] CVE-2021-44142: smbd: add Netatalk xattr used by
vfs_fruit to the list of private Samba xattrs
This is an internal xattr that should not be user visible.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14914
Signed-off-by: Ralph Boehme <slow@samba.org>
[slow@samba.org: conflict due to changed includes in source3/smbd/trans2.c]
---
source3/smbd/trans2.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c
index 70a492a96a8a..a200656b76cf 100644
--- a/source3/smbd/trans2.c
+++ b/source3/smbd/trans2.c
@@ -45,6 +45,7 @@
#include "smb1_utils.h"
#include "libcli/smb/smb2_posix.h"
#include "lib/util/string_wrappers.h"
+#include "source3/lib/adouble.h"
#define DIR_ENTRY_SAFETY_MARGIN 4096
@@ -218,6 +219,7 @@ bool samba_private_attr_name(const char *unix_ea_name)
SAMBA_XATTR_DOS_ATTRIB,
SAMBA_XATTR_MARKER,
XATTR_NTACL_NAME,
+ AFPINFO_EA_NETATALK,
NULL
};
--
2.34.1
From 73302708170a71afce09ff42640ea4fceff4d08a Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Fri, 26 Nov 2021 07:19:32 +0100
Subject: [PATCH 3/5] CVE-2021-44142: libadouble: harden ad_unpack_xattrs()
This ensures ad_unpack_xattrs() is only called for an ad_type of ADOUBLE_RSRC,
which is used for parsing ._ AppleDouble sidecar files, and the buffer
ad->ad_data is AD_XATTR_MAX_HDR_SIZE bytes large which is a prerequisite for all
buffer out-of-bounds access checks in ad_unpack_xattrs().
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14914
Signed-off-by: Ralph Boehme <slow@samba.org>
---
source3/lib/adouble.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/source3/lib/adouble.c b/source3/lib/adouble.c
index 0ab9019cfb59..7875dd6f0df8 100644
--- a/source3/lib/adouble.c
+++ b/source3/lib/adouble.c
@@ -707,14 +707,27 @@ static bool ad_pack(struct vfs_handle_struct *handle,
static bool ad_unpack_xattrs(struct adouble *ad)
{
struct ad_xattr_header *h = &ad->adx_header;
+ size_t bufsize = talloc_get_size(ad->ad_data);
const char *p = ad->ad_data;
uint32_t hoff;
uint32_t i;
+ if (ad->ad_type != ADOUBLE_RSRC) {
+ return false;
+ }
+
if (ad_getentrylen(ad, ADEID_FINDERI) <= ADEDLEN_FINDERI) {
return true;
}
+ /*
+ * Ensure the buffer ad->ad_data was allocated by ad_alloc() for an
+ * ADOUBLE_RSRC type (._ AppleDouble file on-disk).
+ */
+ if (bufsize != AD_XATTR_MAX_HDR_SIZE) {
+ return false;
+ }
+
/* 2 bytes padding */
hoff = ad_getentryoff(ad, ADEID_FINDERI) + ADEDLEN_FINDERI + 2;
@@ -964,9 +977,11 @@ static bool ad_unpack(struct adouble *ad, const size_t nentries,
ad->ad_eid[eid].ade_len = len;
}
- ok = ad_unpack_xattrs(ad);
- if (!ok) {
- return false;
+ if (ad->ad_type == ADOUBLE_RSRC) {
+ ok = ad_unpack_xattrs(ad);
+ if (!ok) {
+ return false;
+ }
}
return true;
--
2.34.1
From 0cfe02ac7ad197ea9fb4b19f296b73e5e7baf0af Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Thu, 25 Nov 2021 15:04:03 +0100
Subject: [PATCH 4/5] 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>
[slow@samba.org: conflict due to missing test in selftest/tests.py]
---
selftest/knownfail.d/samba.unittests.adouble | 3 +
selftest/tests.py | 2 +
source3/lib/test_adouble.c | 389 +++++++++++++++++++
source3/wscript_build | 5 +
4 files changed, 399 insertions(+)
create mode 100644 selftest/knownfail.d/samba.unittests.adouble
create mode 100644 source3/lib/test_adouble.c
diff --git a/selftest/knownfail.d/samba.unittests.adouble b/selftest/knownfail.d/samba.unittests.adouble
new file mode 100644
index 000000000000..8b0314f2faec
--- /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 af1e46061852..f4a1056f1dc8 100644
--- a/selftest/tests.py
+++ b/selftest/tests.py
@@ -427,3 +427,5 @@ plantestsuite("samba.unittests.test_oLschema2ldif", "none",
[os.path.join(bindir(), "default/source3/test_mdsparser_es")] + [configuration])
plantestsuite("samba.unittests.credentials", "none",
[os.path.join(bindir(), "default/auth/credentials/test_creds")])
+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 000000000000..615c22469c91
--- /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 a143477a5064..95e589cfc734 100644
--- a/source3/wscript_build
+++ b/source3/wscript_build
@@ -1088,6 +1088,11 @@ 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')
--
2.34.1
From 793ca8c474a74f82745a266f4a4bf9e20443ad53 Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Thu, 13 Jan 2022 17:03:02 +0100
Subject: [PATCH 5/5] CVE-2021-44142: libadouble: harden parsing code
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14914
Signed-off-by: Ralph Boehme <slow@samba.org>
---
selftest/knownfail.d/samba.unittests.adouble | 3 -
source3/lib/adouble.c | 115 ++++++++++++++++---
2 files changed, 101 insertions(+), 17 deletions(-)
delete mode 100644 selftest/knownfail.d/samba.unittests.adouble
diff --git a/selftest/knownfail.d/samba.unittests.adouble b/selftest/knownfail.d/samba.unittests.adouble
deleted file mode 100644
index 8b0314f2faec..000000000000
--- a/selftest/knownfail.d/samba.unittests.adouble
+++ /dev/null
@@ -1,3 +0,0 @@
-^samba.unittests.adouble.parse_abouble_finderinfo2\(none\)
-^samba.unittests.adouble.parse_abouble_finderinfo3\(none\)
-^samba.unittests.adouble.parse_abouble_date2\(none\)
diff --git a/source3/lib/adouble.c b/source3/lib/adouble.c
index 7875dd6f0df8..48cc0007c23c 100644
--- a/source3/lib/adouble.c
+++ b/source3/lib/adouble.c
@@ -269,6 +269,95 @@ size_t ad_setentryoff(struct adouble *ad, int eid, size_t off)
return ad->ad_eid[eid].ade_off = off;
}
+/*
+ * All entries besides FinderInfo and resource fork must fit into the
+ * buffer. FinderInfo is special as it may be larger then the default 32 bytes
+ * if it contains marshalled xattrs, which we will fixup that in
+ * ad_convert(). The first 32 bytes however must also be part of the buffer.
+ *
+ * The resource fork is never accessed directly by the ad_data buf.
+ */
+static bool ad_entry_check_size(uint32_t eid,
+ size_t bufsize,
+ uint32_t off,
+ uint32_t got_len)
+{
+ struct {
+ off_t expected_len;
+ bool fixed_size;
+ bool minimum_size;
+ } ad_checks[] = {
+ [ADEID_DFORK] = {-1, false, false}, /* not applicable */
+ [ADEID_RFORK] = {-1, false, false}, /* no limit */
+ [ADEID_NAME] = {ADEDLEN_NAME, false, false},
+ [ADEID_COMMENT] = {ADEDLEN_COMMENT, false, false},
+ [ADEID_ICONBW] = {ADEDLEN_ICONBW, true, false},
+ [ADEID_ICONCOL] = {ADEDLEN_ICONCOL, false, false},
+ [ADEID_FILEI] = {ADEDLEN_FILEI, true, false},
+ [ADEID_FILEDATESI] = {ADEDLEN_FILEDATESI, true, false},
+ [ADEID_FINDERI] = {ADEDLEN_FINDERI, false, true},
+ [ADEID_MACFILEI] = {ADEDLEN_MACFILEI, true, false},
+ [ADEID_PRODOSFILEI] = {ADEDLEN_PRODOSFILEI, true, false},
+ [ADEID_MSDOSFILEI] = {ADEDLEN_MSDOSFILEI, true, false},
+ [ADEID_SHORTNAME] = {ADEDLEN_SHORTNAME, false, false},
+ [ADEID_AFPFILEI] = {ADEDLEN_AFPFILEI, true, false},
+ [ADEID_DID] = {ADEDLEN_DID, true, false},
+ [ADEID_PRIVDEV] = {ADEDLEN_PRIVDEV, true, false},
+ [ADEID_PRIVINO] = {ADEDLEN_PRIVINO, true, false},
+ [ADEID_PRIVSYN] = {ADEDLEN_PRIVSYN, true, false},
+ [ADEID_PRIVID] = {ADEDLEN_PRIVID, true, false},
+ };
+
+ if (eid >= ADEID_MAX) {
+ return false;
+ }
+ if (got_len == 0) {
+ /* Entry present, but empty, allow */
+ return true;
+ }
+ if (ad_checks[eid].expected_len == 0) {
+ /*
+ * Shouldn't happen: implicitly initialized to zero because
+ * explicit initializer missing.
+ */
+ return false;
+ }
+ if (ad_checks[eid].expected_len == -1) {
+ /* Unused or no limit */
+ return true;
+ }
+ if (ad_checks[eid].fixed_size) {
+ if (ad_checks[eid].expected_len != got_len) {
+ /* Wrong size fo fixed size entry. */
+ return false;
+ }
+ } else {
+ if (ad_checks[eid].minimum_size) {
+ if (got_len < ad_checks[eid].expected_len) {
+ /*
+ * Too small for variable sized entry with
+ * minimum size.
+ */
+ return false;
+ }
+ } else {
+ if (got_len > ad_checks[eid].expected_len) {
+ /* Too big for variable sized entry. */
+ return false;
+ }
+ }
+ }
+ if (off + got_len < off) {
+ /* wrap around */
+ return false;
+ }
+ if (off + got_len > bufsize) {
+ /* overflow */
+ return false;
+ }
+ return true;
+}
+
/**
* Return a pointer to an AppleDouble entry
*
@@ -276,8 +365,15 @@ size_t ad_setentryoff(struct adouble *ad, int eid, size_t off)
**/
char *ad_get_entry(const struct adouble *ad, int eid)
{
+ size_t bufsize = talloc_get_size(ad->ad_data);
off_t off = ad_getentryoff(ad, eid);
size_t len = ad_getentrylen(ad, eid);
+ bool valid;
+
+ valid = ad_entry_check_size(eid, bufsize, off, len);
+ if (!valid) {
+ return NULL;
+ }
if (off == 0 || len == 0) {
return NULL;
@@ -914,20 +1010,11 @@ static bool ad_unpack(struct adouble *ad, const size_t nentries,
return false;
}
- /*
- * All entries besides FinderInfo and resource fork
- * must fit into the buffer. FinderInfo is special as
- * it may be larger then the default 32 bytes (if it
- * contains marshalled xattrs), but we will fixup that
- * in ad_convert(). And the resource fork is never
- * accessed directly by the ad_data buf (also see
- * comment above) anyway.
- */
- if ((eid != ADEID_RFORK) &&
- (eid != ADEID_FINDERI) &&
- ((off + len) > bufsize)) {
- DEBUG(1, ("bogus eid %d: off: %" PRIu32 ", len: %" PRIu32 "\n",
- eid, off, len));
+ ok = ad_entry_check_size(eid, bufsize, off, len);
+ if (!ok) {
+ DBG_ERR("bogus eid [%"PRIu32"] bufsize [%zu] "
+ "off [%"PRIu32"] len [%"PRIu32"]\n",
+ eid, bufsize, off, len);
return false;
}
--
2.34.1
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