r2041: Fix NTLMSSP RPC sealing, client -> win2k3 server.

The bug (found by tridge) is that Win2k3 is being tighter about the
NTLMSSP flags.  If we don't negotiate sealing, we can't use it.

We now have a way to indicate to the GENSEC implementation mechanisms
what things we want for a connection.

Andrew Bartlett
(This used to be commit 86f61568ea44c5719f9b583beeeefb12e0c26f4c)

5 files changed, 88 insertions, 17 deletions

diff --git a/source4/libcli/auth/gensec.c b/source4/libcli/auth/gensec.c
index 24c2c18877..8188701558 100644
--- a/source4/libcli/auth/gensec.c
+++ b/source4/libcli/auth/gensec.c
@@ -145,6 +145,7 @@ static NTSTATUS gensec_start(struct gensec_security **gensec_security)
 	(*gensec_security)->default_user.realm = talloc_strdup(mem_ctx, lp_realm());
 
 	(*gensec_security)->subcontext = False;
+	(*gensec_security)->want_features = 0;
 	return NT_STATUS_OK;
 }
 
@@ -232,13 +233,20 @@ static NTSTATUS gensec_start_mech(struct gensec_security *gensec_security)
  */
 
 NTSTATUS gensec_start_mech_by_authtype(struct gensec_security *gensec_security, 
-				       uint8_t authtype) 
+				       uint8_t auth_type, uint8_t auth_level) 
 {
-	gensec_security->ops = gensec_security_by_authtype(authtype);
+	gensec_security->ops = gensec_security_by_authtype(auth_type);
 	if (!gensec_security->ops) {
-		DEBUG(3, ("Could not find GENSEC backend for authtype=%d\n", (int)authtype));
+		DEBUG(3, ("Could not find GENSEC backend for auth_type=%d\n", (int)auth_type));
 		return NT_STATUS_INVALID_PARAMETER;
 	}
+	if (auth_level == DCERPC_AUTH_LEVEL_INTEGRITY) {
+		gensec_want_feature(gensec_security, GENSEC_WANT_SIGN);
+	}
+	if (auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
+		gensec_want_feature(gensec_security, GENSEC_WANT_SIGN);
+		gensec_want_feature(gensec_security, GENSEC_WANT_SEAL);
+	}
 	return gensec_start_mech(gensec_security);
 }
 
@@ -308,6 +316,10 @@ NTSTATUS gensec_check_packet(struct gensec_security *gensec_security,
 	if (!gensec_security->ops->check_packet) {
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
+	if (!(gensec_security->want_features & GENSEC_WANT_SIGN)) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
 	return gensec_security->ops->check_packet(gensec_security, mem_ctx, data, length, sig);
 }
 
@@ -319,6 +331,10 @@ NTSTATUS gensec_seal_packet(struct gensec_security *gensec_security,
 	if (!gensec_security->ops->seal_packet) {
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
+	if (!(gensec_security->want_features & GENSEC_WANT_SEAL)) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
 	return gensec_security->ops->seal_packet(gensec_security, mem_ctx, data, length, sig);
 }
 
@@ -330,6 +346,10 @@ NTSTATUS gensec_sign_packet(struct gensec_security *gensec_security,
 	if (!gensec_security->ops->sign_packet) {
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
+	if (!(gensec_security->want_features & GENSEC_WANT_SIGN)) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
 	return gensec_security->ops->sign_packet(gensec_security, mem_ctx, data, length, sig);
 }
 
@@ -339,6 +359,10 @@ NTSTATUS gensec_session_key(struct gensec_security *gensec_security,
 	if (!gensec_security->ops->session_key) {
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
+	if (!(gensec_security->want_features & GENSEC_WANT_SESSION_KEY)) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	
 	return gensec_security->ops->session_key(gensec_security, session_key);
 }
 
@@ -393,6 +417,17 @@ void gensec_end(struct gensec_security **gensec_security)
 }
 
 /** 
+ * Set the requirement for a certain feature on the connection
+ *
+ */
+
+void gensec_want_feature(struct gensec_security *gensec_security,
+			 uint32 feature) 
+{
+	gensec_security->want_features |= feature;
+}
+
+/** 
  * Set a username on a GENSEC context - ensures it is talloc()ed 
  *
  */
diff --git a/source4/libcli/auth/gensec.h b/source4/libcli/auth/gensec.h
index 880ee45265..73a5f6b463 100644
--- a/source4/libcli/auth/gensec.h
+++ b/source4/libcli/auth/gensec.h
@@ -36,7 +36,10 @@ struct gensec_target {
 	const struct sock_addr *addr;
 	const char *service;
 };
-		
+
+#define GENSEC_WANT_SESSION_KEY 0x1
+#define GENSEC_WANT_SIGN 0x2
+#define GENSEC_WANT_SEAL 0x4
 
 /* GENSEC mode */
 enum gensec_role
@@ -86,6 +89,7 @@ struct gensec_security {
 	struct gensec_target target;
 	enum gensec_role gensec_role;
 	BOOL subcontext;
+	uint32 want_features;
 };
 
 /* this structure is used by backends to determine the size of some critical types */
diff --git a/source4/libcli/auth/gensec_ntlmssp.c b/source4/libcli/auth/gensec_ntlmssp.c
index 99247fb626..ae03bc88e6 100644
--- a/source4/libcli/auth/gensec_ntlmssp.c
+++ b/source4/libcli/auth/gensec_ntlmssp.c
@@ -179,6 +179,13 @@ static NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_secur
 		return nt_status;
 	}
 
+	if (gensec_security->want_features & GENSEC_WANT_SIGN) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_WANT_SEAL) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
+	}
+
 	ntlmssp_state = gensec_ntlmssp_state->ntlmssp_state;
 	if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&gensec_ntlmssp_state->auth_context))) {
 		return nt_status;
@@ -211,6 +218,25 @@ static NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_secur
 		return status;
 	}
 
+	if (gensec_security->want_features & GENSEC_WANT_SESSION_KEY) {
+		/*
+		 * We need to set this to allow a later SetPassword
+		 * via the SAMR pipe to succeed. Strange.... We could
+		 * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
+		 * 
+		 * Without this, Windows will not create the master key
+		 * that it thinks is only used for NTLMSSP signing and 
+		 * sealing.  (It is actually pulled out and used directly) 
+		 */
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_WANT_SIGN) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_WANT_SEAL) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
+	}
+
 	status = ntlmssp_set_domain(gensec_ntlmssp_state->ntlmssp_state, 
 				    gensec_security->user.domain);
 	if (!NT_STATUS_IS_OK(status)) {
diff --git a/source4/libcli/auth/ntlmssp.c b/source4/libcli/auth/ntlmssp.c
index 893e8520c2..4d2dd6b576 100644
--- a/source4/libcli/auth/ntlmssp.c
+++ b/source4/libcli/auth/ntlmssp.c
@@ -375,6 +375,14 @@ static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
 		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 	}
 
+	if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
+	}
+
+	if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
+	}
+
 	if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
 		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 	}
@@ -933,9 +941,7 @@ NTSTATUS ntlmssp_server_start(struct ntlmssp_state **ntlmssp_state)
 		NTLMSSP_NEGOTIATE_128 |
 		NTLMSSP_NEGOTIATE_NTLM |
 /*		NTLMSSP_NEGOTIATE_NTLM2 | */
-		NTLMSSP_NEGOTIATE_KEY_EXCH |
-		NTLMSSP_NEGOTIATE_SIGN |
-		NTLMSSP_NEGOTIATE_SEAL;
+		NTLMSSP_NEGOTIATE_KEY_EXCH;
 
 	return NT_STATUS_OK;
 }
@@ -1289,16 +1295,6 @@ NTSTATUS ntlmssp_client_start(struct ntlmssp_state **ntlmssp_state)
 		NTLMSSP_NEGOTIATE_NTLM |
 /*		NTLMSSP_NEGOTIATE_NTLM2 |*/
 		NTLMSSP_NEGOTIATE_KEY_EXCH |
-		/*
-		 * We need to set this to allow a later SetPassword
-		 * via the SAMR pipe to succeed. Strange.... We could
-		 * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
-		 * 
-		 * Without this, Windows will not create the master key
-		 * that it thinks is only used for NTLMSSP signing and 
-		 * sealing.  (It is actually pulled out and used directly) 
-		 */
-		NTLMSSP_NEGOTIATE_SIGN |
 		NTLMSSP_REQUEST_TARGET;
 
 	return NT_STATUS_OK;
diff --git a/source4/libcli/auth/ntlmssp_sign.c b/source4/libcli/auth/ntlmssp_sign.c
index 80ce1cccc0..6c770b87b9 100644
--- a/source4/libcli/auth/ntlmssp_sign.c
+++ b/source4/libcli/auth/ntlmssp_sign.c
@@ -178,6 +178,11 @@ NTSTATUS ntlmssp_sign_packet(struct ntlmssp_state *ntlmssp_state,
 		return NT_STATUS_NO_USER_SESSION_KEY;
 	}
 
+	if (!ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
+		DEBUG(3, ("NTLMSSP Signing not negotiated - cannot sign packet!\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
 	nt_status = ntlmssp_make_packet_signature(ntlmssp_state, sig_mem_ctx, 
 						  data, length, NTLMSSP_SEND, sig);
 
@@ -268,6 +273,11 @@ NTSTATUS ntlmssp_seal_packet(struct ntlmssp_state *ntlmssp_state,
 		return NT_STATUS_NO_USER_SESSION_KEY;
 	}
 
+	if (!ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
+		DEBUG(3, ("NTLMSSP Sealing not negotiated - cannot seal packet!\n"));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
 	DEBUG(10,("ntlmssp_seal_data: seal\n"));
 	dump_data_pw("ntlmssp clear data\n", data, length);
 	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {