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Fix netlogon LogonGetCapabilities level 2 error handling

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resolves: #2223091

Guenther
This commit is contained in:
Günther Deschner 2023-07-15 15:17:52 +02:00
parent a38fba0562
commit 64ef2ec2d2
2 changed files with 357 additions and 1 deletions
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351
master-netlogongetcaps.patch Normal file
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@ -0,0 +1,351 @@
From 5f87888ed53320538cf773d64868390d8641a40e Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Sat, 15 Jul 2023 17:20:32 +0200
Subject: [PATCH 1/4] netlogon.idl: add support for netr_LogonGetCapabilities
response level 2
We don't have any documentation about this yet, but tests against
a Windows Server 2022 patched with KB5028166 revealed that
the response for query_level=2 is exactly the same as
for querey_level=1.
Until we know the reason for query_level=2 we won't
use it as client nor support it in the server, but
we want ndrdump to work.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15418
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
---
librpc/idl/netlogon.idl | 1 +
1 file changed, 1 insertion(+)
diff --git a/librpc/idl/netlogon.idl b/librpc/idl/netlogon.idl
index 48a8c8f9310..85dd73ee7e4 100644
--- a/librpc/idl/netlogon.idl
+++ b/librpc/idl/netlogon.idl
@@ -1236,6 +1236,7 @@ interface netlogon
/* Function 0x15 */
typedef [switch_type(uint32)] union {
[case(1)] netr_NegotiateFlags server_capabilities;
+ [case(2)] netr_NegotiateFlags server_capabilities;
} netr_Capabilities;
NTSTATUS netr_LogonGetCapabilities(
--
2.41.0
From 404ce08e9088968311c714e756f5d58ce2cef715 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Sat, 15 Jul 2023 17:25:05 +0200
Subject: [PATCH 2/4] s4:torture/rpc: let rpc.schannel also check
netr_LogonGetCapabilities with different levels
The important change it that we expect DCERPC_NCA_S_FAULT_INVALID_TAG
for unsupported query_levels, we allow it to work with servers
with or without support for query_level=2.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15418
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
---
.../knownfail.d/netr_LogonGetCapabilities | 3 +
source4/torture/rpc/netlogon.c | 77 ++++++++++++++++++-
2 files changed, 79 insertions(+), 1 deletion(-)
create mode 100644 selftest/knownfail.d/netr_LogonGetCapabilities
diff --git a/selftest/knownfail.d/netr_LogonGetCapabilities b/selftest/knownfail.d/netr_LogonGetCapabilities
new file mode 100644
index 00000000000..30aadf3bb9d
--- /dev/null
+++ b/selftest/knownfail.d/netr_LogonGetCapabilities
@@ -0,0 +1,3 @@
+^samba3.rpc.schannel.*\.schannel\(nt4_dc
+^samba3.rpc.schannel.*\.schannel\(ad_dc
+^samba4.rpc.schannel.*\.schannel\(ad_dc
diff --git a/source4/torture/rpc/netlogon.c b/source4/torture/rpc/netlogon.c
index 1f068eb7826..a3d190f13dd 100644
--- a/source4/torture/rpc/netlogon.c
+++ b/source4/torture/rpc/netlogon.c
@@ -2056,8 +2056,47 @@ bool test_netlogon_capabilities(struct dcerpc_pipe *p, struct torture_context *t
r.out.capabilities = &capabilities;
r.out.return_authenticator = &return_auth;
- torture_comment(tctx, "Testing LogonGetCapabilities\n");
+ torture_comment(tctx, "Testing LogonGetCapabilities with query_level=0\n");
+ r.in.query_level = 0;
+ ZERO_STRUCT(return_auth);
+
+ /*
+ * we need to operate on a temporary copy of creds
+ * because dcerpc_netr_LogonGetCapabilities with
+ * an unknown query level returns DCERPC_NCA_S_FAULT_INVALID_TAG
+ * => NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE
+ * without looking a the authenticator.
+ */
+ tmp_creds = *creds;
+ netlogon_creds_client_authenticator(&tmp_creds, &auth);
+
+ status = dcerpc_netr_LogonGetCapabilities_r(b, tctx, &r);
+ torture_assert_ntstatus_equal(tctx, status, NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE,
+ "LogonGetCapabilities query_level=0 failed");
+
+ torture_comment(tctx, "Testing LogonGetCapabilities with query_level=3\n");
+
+ r.in.query_level = 3;
+ ZERO_STRUCT(return_auth);
+
+ /*
+ * we need to operate on a temporary copy of creds
+ * because dcerpc_netr_LogonGetCapabilities with
+ * an unknown query level returns DCERPC_NCA_S_FAULT_INVALID_TAG
+ * => NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE
+ * without looking a the authenticator.
+ */
+ tmp_creds = *creds;
+ netlogon_creds_client_authenticator(&tmp_creds, &auth);
+
+ status = dcerpc_netr_LogonGetCapabilities_r(b, tctx, &r);
+ torture_assert_ntstatus_equal(tctx, status, NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE,
+ "LogonGetCapabilities query_level=0 failed");
+
+ torture_comment(tctx, "Testing LogonGetCapabilities with query_level=1\n");
+
+ r.in.query_level = 1;
ZERO_STRUCT(return_auth);
/*
@@ -2077,6 +2116,42 @@ bool test_netlogon_capabilities(struct dcerpc_pipe *p, struct torture_context *t
*creds = tmp_creds;
+ torture_assert(tctx, netlogon_creds_client_check(creds,
+ &r.out.return_authenticator->cred),
+ "Credential chaining failed");
+
+ torture_assert_int_equal(tctx, creds->negotiate_flags,
+ capabilities.server_capabilities,
+ "negotiate flags");
+
+ torture_comment(tctx, "Testing LogonGetCapabilities with query_level=2\n");
+
+ r.in.query_level = 2;
+ ZERO_STRUCT(return_auth);
+
+ /*
+ * we need to operate on a temporary copy of creds
+ * because dcerpc_netr_LogonGetCapabilities with
+ * an query level 2 may returns DCERPC_NCA_S_FAULT_INVALID_TAG
+ * => NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE
+ * without looking a the authenticator.
+ */
+ tmp_creds = *creds;
+ netlogon_creds_client_authenticator(&tmp_creds, &auth);
+
+ status = dcerpc_netr_LogonGetCapabilities_r(b, tctx, &r);
+ if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE)) {
+ /*
+ * an server without KB5028166 returns
+ * DCERPC_NCA_S_FAULT_INVALID_TAG =>
+ * NT_STATUS_RPC_ENUM_VALUE_OUT_OF_RANGE
+ */
+ return true;
+ }
+ torture_assert_ntstatus_ok(tctx, status, "LogonGetCapabilities query_level=2 failed");
+
+ *creds = tmp_creds;
+
torture_assert(tctx, netlogon_creds_client_check(creds,
&r.out.return_authenticator->cred),
"Credential chaining failed");
--
2.41.0
From d5f1097b6220676d56ed5fc6707acf667b704518 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Sat, 15 Jul 2023 16:11:48 +0200
Subject: [PATCH 3/4] s4:rpc_server:netlogon: generate FAULT_INVALID_TAG for
invalid netr_LogonGetCapabilities levels
This is important as Windows clients with KB5028166 seem to
call netr_LogonGetCapabilities with query_level=2 after
a call with query_level=1.
An unpatched Windows Server returns DCERPC_NCA_S_FAULT_INVALID_TAG
for query_level values other than 1.
While Samba tries to return NT_STATUS_NOT_SUPPORTED, but
later fails to marshall the response, which results
in DCERPC_FAULT_BAD_STUB_DATA instead.
Because we don't have any documentation for level 2 yet,
we just try to behave like an unpatched server and
generate DCERPC_NCA_S_FAULT_INVALID_TAG instead of
DCERPC_FAULT_BAD_STUB_DATA.
Which allows patched Windows clients to keep working
against a Samba DC.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15418
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
---
.../knownfail.d/netr_LogonGetCapabilities | 2 --
source4/rpc_server/netlogon/dcerpc_netlogon.c | 28 ++++++++++++++++---
2 files changed, 24 insertions(+), 6 deletions(-)
diff --git a/selftest/knownfail.d/netr_LogonGetCapabilities b/selftest/knownfail.d/netr_LogonGetCapabilities
index 30aadf3bb9d..99c7ac711ed 100644
--- a/selftest/knownfail.d/netr_LogonGetCapabilities
+++ b/selftest/knownfail.d/netr_LogonGetCapabilities
@@ -1,3 +1 @@
^samba3.rpc.schannel.*\.schannel\(nt4_dc
-^samba3.rpc.schannel.*\.schannel\(ad_dc
-^samba4.rpc.schannel.*\.schannel\(ad_dc
diff --git a/source4/rpc_server/netlogon/dcerpc_netlogon.c b/source4/rpc_server/netlogon/dcerpc_netlogon.c
index 6ccba65d3bf..dc2167f08b2 100644
--- a/source4/rpc_server/netlogon/dcerpc_netlogon.c
+++ b/source4/rpc_server/netlogon/dcerpc_netlogon.c
@@ -2364,6 +2364,30 @@ static NTSTATUS dcesrv_netr_LogonGetCapabilities(struct dcesrv_call_state *dce_c
struct netlogon_creds_CredentialState *creds;
NTSTATUS status;
+ switch (r->in.query_level) {
+ case 1:
+ break;
+ case 2:
+ /*
+ * Until we know the details behind KB5028166
+ * just return DCERPC_NCA_S_FAULT_INVALID_TAG
+ * like an unpatched Windows Server.
+ */
+ FALL_THROUGH;
+ default:
+ /*
+ * There would not be a way to marshall the
+ * the response. Which would mean our final
+ * ndr_push would fail an we would return
+ * an RPC-level fault with DCERPC_FAULT_BAD_STUB_DATA.
+ *
+ * But it's important to match a Windows server
+ * especially before KB5028166, see also our bug #15418
+ * Otherwise Windows client would stop talking to us.
+ */
+ DCESRV_FAULT(DCERPC_NCA_S_FAULT_INVALID_TAG);
+ }
+
status = dcesrv_netr_creds_server_step_check(dce_call,
mem_ctx,
r->in.computer_name,
@@ -2375,10 +2399,6 @@ static NTSTATUS dcesrv_netr_LogonGetCapabilities(struct dcesrv_call_state *dce_c
}
NT_STATUS_NOT_OK_RETURN(status);
- if (r->in.query_level != 1) {
- return NT_STATUS_NOT_SUPPORTED;
- }
-
r->out.capabilities->server_capabilities = creds->negotiate_flags;
return NT_STATUS_OK;
--
2.41.0
From dfeabce44fbb78083fbbb2aa634fc4172cf83db9 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Sat, 15 Jul 2023 16:11:48 +0200
Subject: [PATCH 4/4] s3:rpc_server:netlogon: generate FAULT_INVALID_TAG for
invalid netr_LogonGetCapabilities levels
This is important as Windows clients with KB5028166 seem to
call netr_LogonGetCapabilities with query_level=2 after
a call with query_level=1.
An unpatched Windows Server returns DCERPC_NCA_S_FAULT_INVALID_TAG
for query_level values other than 1.
While Samba tries to return NT_STATUS_NOT_SUPPORTED, but
later fails to marshall the response, which results
in DCERPC_FAULT_BAD_STUB_DATA instead.
Because we don't have any documentation for level 2 yet,
we just try to behave like an unpatched server and
generate DCERPC_NCA_S_FAULT_INVALID_TAG instead of
DCERPC_FAULT_BAD_STUB_DATA.
Which allows patched Windows clients to keep working
against a Samba DC.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15418
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Mon Jul 17 07:35:09 UTC 2023 on atb-devel-224
---
.../knownfail.d/netr_LogonGetCapabilities | 1 -
source3/rpc_server/netlogon/srv_netlog_nt.c | 29 ++++++++++++++++---
2 files changed, 25 insertions(+), 5 deletions(-)
delete mode 100644 selftest/knownfail.d/netr_LogonGetCapabilities
diff --git a/selftest/knownfail.d/netr_LogonGetCapabilities b/selftest/knownfail.d/netr_LogonGetCapabilities
deleted file mode 100644
index 99c7ac711ed..00000000000
--- a/selftest/knownfail.d/netr_LogonGetCapabilities
+++ /dev/null
@@ -1 +0,0 @@
-^samba3.rpc.schannel.*\.schannel\(nt4_dc
diff --git a/source3/rpc_server/netlogon/srv_netlog_nt.c b/source3/rpc_server/netlogon/srv_netlog_nt.c
index 3ba58e61206..e8aa14167fc 100644
--- a/source3/rpc_server/netlogon/srv_netlog_nt.c
+++ b/source3/rpc_server/netlogon/srv_netlog_nt.c
@@ -2284,6 +2284,31 @@ NTSTATUS _netr_LogonGetCapabilities(struct pipes_struct *p,
struct netlogon_creds_CredentialState *creds;
NTSTATUS status;
+ switch (r->in.query_level) {
+ case 1:
+ break;
+ case 2:
+ /*
+ * Until we know the details behind KB5028166
+ * just return DCERPC_NCA_S_FAULT_INVALID_TAG
+ * like an unpatched Windows Server.
+ */
+ FALL_THROUGH;
+ default:
+ /*
+ * There would not be a way to marshall the
+ * the response. Which would mean our final
+ * ndr_push would fail an we would return
+ * an RPC-level fault with DCERPC_FAULT_BAD_STUB_DATA.
+ *
+ * But it's important to match a Windows server
+ * especially before KB5028166, see also our bug #15418
+ * Otherwise Windows client would stop talking to us.
+ */
+ p->fault_state = DCERPC_NCA_S_FAULT_INVALID_TAG;
+ return NT_STATUS_NOT_SUPPORTED;
+ }
+
become_root();
status = dcesrv_netr_creds_server_step_check(p->dce_call,
p->mem_ctx,
@@ -2296,10 +2321,6 @@ NTSTATUS _netr_LogonGetCapabilities(struct pipes_struct *p,
return status;
}
- if (r->in.query_level != 1) {
- return NT_STATUS_NOT_SUPPORTED;
- }
-
r->out.capabilities->server_capabilities = creds->negotiate_flags;
return NT_STATUS_OK;
--
2.41.0

7
samba.spec
View File

@ -138,7 +138,7 @@
%define samba_requires_eq() %(LC_ALL="C" echo '%*' | xargs -r rpm -q --qf 'Requires: %%{name} = %%{epoch}:%%{version}\\n' | sed -e 's/ (none):/ /' -e 's/ 0:/ /' | grep -v "is not")
%global samba_version 4.18.4
%global baserelease 2
%global baserelease 3
# This should be rc1 or %%nil
%global pre_release %nil
@ -234,6 +234,8 @@ Source17: samba-usershares-systemd-sysusers.conf
Source201: README.downgrade
Source202: samba.abignore
Patch0: master-netlogongetcaps.patch
Requires(pre): /usr/sbin/groupadd
Requires(pre): %{name}-common = %{samba_depver}
@ -4333,6 +4335,9 @@ fi
%endif
%changelog
* Sat Jul 15 2023 Guenther Deschner <gdeschner@redhat.com> - 4.18.4-3
- resolves: #2223091 - Fix netlogon LogonGetCapabilities level 2 error handling
* Tue Jul 11 2023 František Zatloukal <fzatlouk@redhat.com> - 2:4.18.4-2
- Rebuilt for ICU 73.2