s3: Make sure we call wbcAuthenticateUserEx correctly

There are cases where we fill in params.password.response.lm_data with non-NULL
where params.password.response.lm_length is 0. wbcAuthenticateUserEx does not
like that.

I haven't been able to reproduce this with smbclient yet, I've seen it with a
proprietary smb client implementation.

Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Mon Jan 17 16:30:11 CET 2011 on sn-devel-104

2 files changed, 29 insertions, 8 deletions

diff --git a/source3/auth/auth_wbc.c b/source3/auth/auth_wbc.c
index 6beec73456..c2ff4902fc 100644
--- a/source3/auth/auth_wbc.c
+++ b/source3/auth/auth_wbc.c
@@ -59,6 +59,9 @@ static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
 	if (!user_info || !auth_context || !server_info) {
 		return NT_STATUS_INVALID_PARAMETER;
 	}
+
+	ZERO_STRUCT(params);
+
 	/* Send off request */
 
 	DEBUG(10, ("Check auth for: [%s]", user_info->mapped.account_name));
@@ -91,10 +94,18 @@ static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
 		    auth_context->challenge.data,
 		    sizeof(params.password.response.challenge));
 
-		params.password.response.nt_length = user_info->password.response.nt.length;
-		params.password.response.nt_data = user_info->password.response.nt.data;
-		params.password.response.lm_length = user_info->password.response.lanman.length;
-		params.password.response.lm_data = user_info->password.response.lanman.data;
+		if (user_info->password.response.nt.length != 0) {
+			params.password.response.nt_length =
+				user_info->password.response.nt.length;
+			params.password.response.nt_data =
+				user_info->password.response.nt.data;
+		}
+		if (user_info->password.response.lanman.length != 0) {
+			params.password.response.lm_length =
+				user_info->password.response.lanman.length;
+			params.password.response.lm_data =
+				user_info->password.response.lanman.data;
+		}
 	default:
 		DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n",user_info->mapped.account_name, user_info->password_state));
 		return NT_STATUS_INTERNAL_ERROR;
diff --git a/source3/auth/auth_winbind.c b/source3/auth/auth_winbind.c
index 603ec9b410..9328b66fb5 100644
--- a/source3/auth/auth_winbind.c
+++ b/source3/auth/auth_winbind.c
@@ -39,6 +39,8 @@ static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
 	struct wbcAuthUserInfo *info = NULL;
 	struct wbcAuthErrorInfo *err = NULL;
 
+	ZERO_STRUCT(params);
+
 	if (!user_info) {
 		return NT_STATUS_INVALID_PARAMETER;
 	}
@@ -72,10 +74,18 @@ static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
 	       auth_context->challenge.data,
 	       sizeof(params.password.response.challenge));
 
-	params.password.response.nt_length	= user_info->password.response.nt.length;
-	params.password.response.nt_data	= user_info->password.response.nt.data;
-	params.password.response.lm_length	= user_info->password.response.lanman.length;
-	params.password.response.lm_data	= user_info->password.response.lanman.data;
+	if (user_info->password.response.nt.length != 0) {
+		params.password.response.nt_length =
+			user_info->password.response.nt.length;
+		params.password.response.nt_data =
+			user_info->password.response.nt.data;
+	}
+	if (user_info->password.response.lanman.length != 0) {
+		params.password.response.lm_length =
+			user_info->password.response.lanman.length;
+		params.password.response.lm_data =
+			user_info->password.response.lanman.data;
+	}
 
 	/* we are contacting the privileged pipe */
 	become_root();