[PATCH] Version 3 - Fix smbd behavior with SMB2-FLUSH on a directory handle.
Ralph Böhme
slow at samba.org
Thu May 17 20:18:20 UTC 2018
On Wed, May 16, 2018 at 03:56:32PM -0700, Jeremy Allison wrote:
> On Fri, May 11, 2018 at 09:23:24AM -0700, Jeremy Allison wrote:
> > Changes from V2.
> >
> > After review from Ralph, clarified
> > that *either* FILE_ADD_FILE or
> > FILE_ADD_SUBDIRECTORY is enough
> > to make flush succeed.
> >
> > Updated the 'if' statement to
> > use a helper variable and improved
> > the comment, hopefully this will
> > make it easier to understand and
> > review.
> >
> > Added separate tests against
> > FILE_ADD_FILE and FILE_ADD_SUBDIRECTORY
> > bits to show either is sufficient
> > to all dir handle flush (tested
> > works against Windows server).
> >
> > Please review and push if happy !
>
> Ping ! Just got confirmation from Microsoft
> doc-help that indeed this is the way that
> a Windows server behaves on the wire.
>
> Ralph, if you can take a look I'd appreciate
> it.
sorry, forgot about this one...
I'm still getting kind of indentation-seasick when I look at the if condition in
the first patch. :) Can we sanitize the indentation somehow like in the attached
fixup? Feel free to push with my +1 with the fixup. :)
-theifconditionindentationnitpicker
--
Ralph Boehme, Samba Team https://samba.org/
Samba Developer, SerNet GmbH https://sernet.de/en/samba/
GPG Key Fingerprint: FAE2 C608 8A24 2520 51C5
59E4 AA1E 9B71 2639 9E46
-------------- next part --------------
From a588137fa93e61bd79a460ae08bddac9d6bffa0a Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra at samba.org>
Date: Thu, 10 May 2018 10:26:52 -0700
Subject: [PATCH 1/3] s3: smbd: Fix SMB2-FLUSH against directories.
Directories opened with either FILE_ADD_FILE or
FILE_ADD_SUBDIRECTORY can be flushed even if
they're not writable in the conventional sense.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13428
Signed-off-by: Jeremy Allison <jra at samba.org>
---
source3/smbd/smb2_flush.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/source3/smbd/smb2_flush.c b/source3/smbd/smb2_flush.c
index f7d9e964319..c0340103624 100644
--- a/source3/smbd/smb2_flush.c
+++ b/source3/smbd/smb2_flush.c
@@ -23,6 +23,7 @@
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/util/tevent_ntstatus.h"
+#include "libcli/security/security.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_SMB2
@@ -147,8 +148,29 @@ static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
}
if (!CHECK_WRITE(fsp)) {
- tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
- return tevent_req_post(req, ev);
+ bool allow_dir_flush = false;
+
+ if (!fsp->is_directory) {
+ tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
+ return tevent_req_post(req, ev);
+ }
+
+ /*
+ * Directories are not writable in the conventional
+ * sense, but if opened with *either*
+ * FILE_ADD_FILE or FILE_ADD_SUBDIRECTORY
+ * they can be flushed.
+ */
+
+ if ((fsp->access_mask &
+ (FILE_ADD_FILE|FILE_ADD_SUBDIRECTORY)) != 0) {
+ allow_dir_flush = true;
+ }
+
+ if (allow_dir_flush == false) {
+ tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
+ return tevent_req_post(req, ev);
+ }
}
if (fsp->fh->fd == -1) {
--
2.13.6
From 8f4329f1be7944e2e638357b08fc20326f920a28 Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow at samba.org>
Date: Thu, 17 May 2018 22:10:44 +0200
Subject: [PATCH 2/3] !fixup s3: smbd: Fix SMB2-FLUSH against directories.
Sanitize if condition indentation.
---
source3/smbd/smb2_flush.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/source3/smbd/smb2_flush.c b/source3/smbd/smb2_flush.c
index c0340103624..470a8df4944 100644
--- a/source3/smbd/smb2_flush.c
+++ b/source3/smbd/smb2_flush.c
@@ -149,6 +149,7 @@ static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
if (!CHECK_WRITE(fsp)) {
bool allow_dir_flush = false;
+ uint32_t flush_access = FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
if (!fsp->is_directory) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
@@ -162,8 +163,7 @@ static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
* they can be flushed.
*/
- if ((fsp->access_mask &
- (FILE_ADD_FILE|FILE_ADD_SUBDIRECTORY)) != 0) {
+ if ((fsp->access_mask & flush_access) != 0) {
allow_dir_flush = true;
}
--
2.13.6
From bfd5cdf4eeff2e8f905e5290bd8757bf0cc90105 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra at samba.org>
Date: Thu, 10 May 2018 11:30:24 -0700
Subject: [PATCH 3/3] s3: smbtorture: Add new SMB2-DIR-FSYNC test to show
behavior of FSYNC on directories.
Tests against a directory handle on the root of a share,
and a directory handle on a sub-directory in a share.
Check SEC_DIR_ADD_FILE and SEC_DIR_ADD_SUBDIR separately,
either allows flush to succeed.
Passes against Windows.
Regression test for:
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13428
Signed-off-by: Jeremy Allison <jra at samba.org>
Reviewed-by: Ralph Boehme <slow at samba.org>
---
selftest/knownfail | 1 +
source3/selftest/tests.py | 2 +-
source3/torture/proto.h | 1 +
source3/torture/test_smb2.c | 270 ++++++++++++++++++++++++++++++++++++++++++++
source3/torture/torture.c | 1 +
5 files changed, 274 insertions(+), 1 deletion(-)
diff --git a/selftest/knownfail b/selftest/knownfail
index a2aeed2690d..8c70d6a6172 100644
--- a/selftest/knownfail
+++ b/selftest/knownfail
@@ -8,6 +8,7 @@
.*driver.add_driver_timestamps # we only can store dates, not timestamps
^samba3.smbtorture_s3.crypt_server\(nt4_dc\).SMB2-SESSION-REAUTH # expected to give ACCESS_DENIED SMB2.1 doesn't have encryption
^samba3.smbtorture_s3.crypt_server\(nt4_dc\).SMB2-SESSION-RECONNECT # expected to give CONNECTION_DISCONNECTED, we need to fix the test
+^samba3.smbtorture_s3.*ad_dc_ntvfs.*SMB2-DIR-FSYNC.*
^samba3.smb2.session enc.reconnect # expected to give CONNECTION_DISCONNECTED, we need to fix the test
^samba3.raw.session enc # expected to give ACCESS_DENIED as SMB1 encryption isn't used
^samba3.smbtorture_s3.crypt_server # expected to give ACCESS_DENIED as SMB1 encryption isn't used
diff --git a/source3/selftest/tests.py b/source3/selftest/tests.py
index 1e1f97efa40..bd84d001041 100755
--- a/source3/selftest/tests.py
+++ b/source3/selftest/tests.py
@@ -77,7 +77,7 @@ tests = ["FDPASS", "LOCK1", "LOCK2", "LOCK3", "LOCK4", "LOCK5", "LOCK6", "LOCK7"
"UID-REGRESSION-TEST", "SHORTNAME-TEST",
"CASE-INSENSITIVE-CREATE", "SMB2-BASIC", "NTTRANS-FSCTL", "SMB2-NEGPROT",
"SMB2-SESSION-REAUTH", "SMB2-SESSION-RECONNECT", "SMB2-FTRUNCATE",
- "SMB2-ANONYMOUS",
+ "SMB2-ANONYMOUS", "SMB2-DIR-FSYNC",
"CLEANUP1",
"CLEANUP2",
"CLEANUP4",
diff --git a/source3/torture/proto.h b/source3/torture/proto.h
index 45870c904fb..1634da49315 100644
--- a/source3/torture/proto.h
+++ b/source3/torture/proto.h
@@ -101,6 +101,7 @@ bool run_smb2_tcon_dependence(int dummy);
bool run_smb2_multi_channel(int dummy);
bool run_smb2_session_reauth(int dummy);
bool run_smb2_ftruncate(int dummy);
+bool run_smb2_dir_fsync(int dummy);
bool run_chain3(int dummy);
bool run_local_conv_auth_info(int dummy);
bool run_local_sprintf_append(int dummy);
diff --git a/source3/torture/test_smb2.c b/source3/torture/test_smb2.c
index 897d034f6a9..094a9b84d6e 100644
--- a/source3/torture/test_smb2.c
+++ b/source3/torture/test_smb2.c
@@ -2065,3 +2065,273 @@ bool run_smb2_ftruncate(int dummy)
}
return correct;
}
+
+/* Ensure SMB2 flush on directories behaves correctly. */
+
+static bool test_dir_fsync(struct cli_state *cli, const char *path)
+{
+ NTSTATUS status;
+ uint64_t fid_persistent, fid_volatile;
+ uint8_t *dir_data = NULL;
+ uint32_t dir_data_length = 0;
+
+ /* Open directory - no write abilities. */
+ status = smb2cli_create(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, path,
+ SMB2_OPLOCK_LEVEL_NONE, /* oplock_level, */
+ SMB2_IMPERSONATION_IMPERSONATION, /* impersonation_level, */
+ SEC_STD_SYNCHRONIZE|
+ SEC_DIR_LIST|
+ SEC_DIR_READ_ATTRIBUTE, /* desired_access, */
+ 0, /* file_attributes, */
+ FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, /* share_access, */
+ FILE_OPEN, /* create_disposition, */
+ FILE_SYNCHRONOUS_IO_NONALERT|FILE_DIRECTORY_FILE, /* create_options, */
+ NULL, /* smb2_create_blobs *blobs */
+ &fid_persistent,
+ &fid_volatile,
+ NULL, NULL, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_create '%s' (readonly) returned %s\n",
+ path,
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_query_directory(
+ cli->conn, cli->timeout, cli->smb2.session, cli->smb2.tcon,
+ 1, 0, 0, fid_persistent, fid_volatile, "*", 0xffff,
+ talloc_tos(), &dir_data, &dir_data_length);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_query_directory returned %s\n",
+ nt_errstr(status));
+ return false;
+ }
+
+ /* Open directory no write access. Flush should fail. */
+
+ status = smb2cli_flush(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, fid_persistent, fid_volatile);
+ if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
+ printf("smb2cli_flush on a read-only directory returned %s\n",
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_close(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, 0, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_close returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ /* Open directory write-attributes only. Flush should still fail. */
+
+ status = smb2cli_create(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, path,
+ SMB2_OPLOCK_LEVEL_NONE, /* oplock_level, */
+ SMB2_IMPERSONATION_IMPERSONATION, /* impersonation_level, */
+ SEC_STD_SYNCHRONIZE|
+ SEC_DIR_LIST|
+ SEC_DIR_WRITE_ATTRIBUTE|
+ SEC_DIR_READ_ATTRIBUTE, /* desired_access, */
+ 0, /* file_attributes, */
+ FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, /* share_access, */
+ FILE_OPEN, /* create_disposition, */
+ FILE_SYNCHRONOUS_IO_NONALERT|FILE_DIRECTORY_FILE, /* create_options, */
+ NULL, /* smb2_create_blobs *blobs */
+ &fid_persistent,
+ &fid_volatile,
+ NULL, NULL, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_create '%s' (write attr) returned %s\n",
+ path,
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_query_directory(
+ cli->conn, cli->timeout, cli->smb2.session, cli->smb2.tcon,
+ 1, 0, 0, fid_persistent, fid_volatile, "*", 0xffff,
+ talloc_tos(), &dir_data, &dir_data_length);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_query_directory returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_flush(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, fid_persistent, fid_volatile);
+ if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
+ printf("smb2cli_flush on a write-attributes directory "
+ "returned %s\n",
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_close(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, 0, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_close returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ /* Open directory with SEC_DIR_ADD_FILE access. Flush should now succeed. */
+
+ status = smb2cli_create(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, path,
+ SMB2_OPLOCK_LEVEL_NONE, /* oplock_level, */
+ SMB2_IMPERSONATION_IMPERSONATION, /* impersonation_level, */
+ SEC_STD_SYNCHRONIZE|
+ SEC_DIR_LIST|
+ SEC_DIR_ADD_FILE, /* desired_access, */
+ 0, /* file_attributes, */
+ FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, /* share_access, */
+ FILE_OPEN, /* create_disposition, */
+ FILE_SYNCHRONOUS_IO_NONALERT|FILE_DIRECTORY_FILE, /* create_options, */
+ NULL, /* smb2_create_blobs *blobs */
+ &fid_persistent,
+ &fid_volatile,
+ NULL, NULL, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_create '%s' (write FILE access) returned %s\n",
+ path,
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_query_directory(
+ cli->conn, cli->timeout, cli->smb2.session, cli->smb2.tcon,
+ 1, 0, 0, fid_persistent, fid_volatile, "*", 0xffff,
+ talloc_tos(), &dir_data, &dir_data_length);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_query_directory returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_flush(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_flush on a directory returned %s\n",
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_close(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, 0, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_close returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ /* Open directory with SEC_DIR_ADD_FILE access. Flush should now succeed. */
+
+ status = smb2cli_create(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, path,
+ SMB2_OPLOCK_LEVEL_NONE, /* oplock_level, */
+ SMB2_IMPERSONATION_IMPERSONATION, /* impersonation_level, */
+ SEC_STD_SYNCHRONIZE|
+ SEC_DIR_LIST|
+ SEC_DIR_ADD_SUBDIR, /* desired_access, */
+ 0, /* file_attributes, */
+ FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, /* share_access, */
+ FILE_OPEN, /* create_disposition, */
+ FILE_SYNCHRONOUS_IO_NONALERT|FILE_DIRECTORY_FILE, /* create_options, */
+ NULL, /* smb2_create_blobs *blobs */
+ &fid_persistent,
+ &fid_volatile,
+ NULL, NULL, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_create '%s' (write DIR access) returned %s\n",
+ path,
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_query_directory(
+ cli->conn, cli->timeout, cli->smb2.session, cli->smb2.tcon,
+ 1, 0, 0, fid_persistent, fid_volatile, "*", 0xffff,
+ talloc_tos(), &dir_data, &dir_data_length);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_query_directory returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_flush(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_flush on a directory returned %s\n",
+ nt_errstr(status));
+ return false;
+ }
+
+ status = smb2cli_close(cli->conn, cli->timeout, cli->smb2.session,
+ cli->smb2.tcon, 0, fid_persistent, fid_volatile);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smb2cli_close returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+
+ return true;
+}
+
+bool run_smb2_dir_fsync(int dummy)
+{
+ struct cli_state *cli = NULL;
+ NTSTATUS status;
+ bool bret = false;
+ const char *dname = "fsync_test_dir";
+
+ printf("Starting SMB2-DIR-FSYNC\n");
+
+ if (!torture_init_connection(&cli)) {
+ return false;
+ }
+
+ status = smbXcli_negprot(cli->conn, cli->timeout,
+ PROTOCOL_SMB2_02, PROTOCOL_SMB2_02);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("smbXcli_negprot returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ status = cli_session_setup_creds(cli, torture_creds);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("cli_session_setup returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ status = cli_tree_connect(cli, share, "?????", NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("cli_tree_connect returned %s\n", nt_errstr(status));
+ return false;
+ }
+
+ (void)cli_rmdir(cli, dname);
+ status = cli_mkdir(cli, dname);
+ if (!NT_STATUS_IS_OK(status)) {
+ printf("cli_mkdir(%s) returned %s\n",
+ dname,
+ nt_errstr(status));
+ return false;
+ }
+
+ /* Test on a subdirectory. */
+ bret = test_dir_fsync(cli, dname);
+ if (bret == false) {
+ (void)cli_rmdir(cli, dname);
+ return false;
+ }
+ (void)cli_rmdir(cli, dname);
+
+ /* Test on the root handle of a share. */
+ bret = test_dir_fsync(cli, "");
+ if (bret == false) {
+ return false;
+ }
+ return true;
+}
diff --git a/source3/torture/torture.c b/source3/torture/torture.c
index 2bc6ff712ce..23671a706cd 100644
--- a/source3/torture/torture.c
+++ b/source3/torture/torture.c
@@ -11595,6 +11595,7 @@ static struct {
{ "SMB2-MULTI-CHANNEL", run_smb2_multi_channel },
{ "SMB2-SESSION-REAUTH", run_smb2_session_reauth },
{ "SMB2-FTRUNCATE", run_smb2_ftruncate },
+ { "SMB2-DIR-FSYNC", run_smb2_dir_fsync },
{ "CLEANUP1", run_cleanup1 },
{ "CLEANUP2", run_cleanup2 },
{ "CLEANUP3", run_cleanup3 },
--
2.13.6
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