r2878: add server sasl support

(there are a lot of clean ups following later, but the LDAP-BASIC test
 works :-)

metze
(This used to be commit 34fe29c04a76f2f53f27adcaf9be2dce8d177516)

3 files changed, 147 insertions, 25 deletions

diff --git a/source4/ldap_server/ldap_bind.c b/source4/ldap_server/ldap_bind.c
index d0e24bde29..3d9cd4b984 100644
--- a/source4/ldap_server/ldap_bind.c
+++ b/source4/ldap_server/ldap_bind.c
@@ -21,13 +21,13 @@
 #include "includes.h"
 
 
-NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
+static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
 {
 	struct ldap_BindRequest *req = &call->request.r.BindRequest;
 	struct ldapsrv_reply *reply;
 	struct ldap_BindResponse *resp;
 
-	DEBUG(10, ("BindRequest dn: %s\n",req->dn));
+	DEBUG(10, ("BindSimple dn: %s\n",req->dn));
 
 	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 	if (!reply) {
@@ -44,9 +44,123 @@ NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 	return ldapsrv_queue_reply(call, reply);
 }
 
+static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
+{
+	struct ldap_BindRequest *req = &call->request.r.BindRequest;
+	struct ldapsrv_reply *reply;
+	struct ldap_BindResponse *resp;
+	int result;
+	const char *errstr;
+	NTSTATUS status = NT_STATUS_OK;
+	NTSTATUS sasl_status;
+	BOOL ret;
+
+	DEBUG(10, ("BindSASL dn: %s\n",req->dn));
+
+	if (!call->conn->gensec) {
+		call->conn->session_info = NULL;
+
+		status = gensec_server_start(call->conn, &call->conn->gensec);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
+			return status;
+		}
+
+		gensec_want_feature(call->conn->gensec, GENSEC_WANT_SIGN|GENSEC_WANT_SEAL);
+
+		status = gensec_start_mech_by_sasl_name(call->conn->gensec, req->creds.SASL.mechanism);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n", 
+				req->creds.SASL.mechanism, nt_errstr(status)));
+			goto reply;
+		}
+	}
+
+reply:
+	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+	if (!reply) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	resp = &reply->msg.r.BindResponse;
+
+	if (NT_STATUS_IS_OK(status)) {
+		status = gensec_update(call->conn->gensec, reply,
+					req->creds.SASL.secblob, &resp->SASL.secblob);
+	}
+
+	if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
+		result = LDAP_SASL_BIND_IN_PROGRESS;
+		errstr = NULL;
+	} else if (NT_STATUS_IS_OK(status)) {
+		result = LDAP_SUCCESS;
+		errstr = NULL;
+	} else {
+		result = 49;
+		errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
+	}
+
+	resp->response.resultcode = result;
+	resp->response.dn = NULL;
+	resp->response.errormessage = errstr;
+	resp->response.referral = NULL;
+
+	sasl_status = status;
+	status = ldapsrv_queue_reply(call, reply);
+	if (!NT_STATUS_IS_OK(sasl_status) || !NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = ldapsrv_do_responses(call->conn);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	ret = ldapsrv_append_to_buf(&call->conn->sasl_out_buffer, call->conn->out_buffer.data, call->conn->out_buffer.length);
+	if (!ret) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	ldapsrv_consumed_from_buf(&call->conn->out_buffer, call->conn->out_buffer.length);
+
+	status = gensec_session_info(call->conn->gensec, &call->conn->session_info);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	//debug_session_info(0, 0, call->conn->session_info);
+
+	return status;
+}
+
+NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
+{
+	struct ldap_BindRequest *req = &call->request.r.BindRequest;
+	struct ldapsrv_reply *reply;
+	struct ldap_BindResponse *resp;
+
+	switch (req->mechanism) {
+		case LDAP_AUTH_MECH_SIMPLE:
+			return ldapsrv_BindSimple(call);
+		case LDAP_AUTH_MECH_SASL:
+			return ldapsrv_BindSASL(call);
+	}
+
+	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+	if (!reply) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	resp = &reply->msg.r.BindResponse;
+	resp->response.resultcode = 7;
+	resp->response.dn = NULL;
+	resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
+	resp->response.referral = NULL;
+	resp->SASL.secblob = data_blob(NULL, 0);
+
+	return ldapsrv_queue_reply(call, reply);
+}
+
 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 {
-/*	struct ldap_UnbindRequest *req = &call->request->r.UnbindRequest;*/
 	DEBUG(10, ("UnbindRequest\n"));
 	return NT_STATUS_OK;
 }
diff --git a/source4/ldap_server/ldap_server.c b/source4/ldap_server/ldap_server.c
index 2ce6b03762..5336cc04f1 100644
--- a/source4/ldap_server/ldap_server.c
+++ b/source4/ldap_server/ldap_server.c
@@ -122,7 +122,7 @@ static void ldapsrv_init(struct server_service *service,
    that a read(2) holds a complete request that is then thrown away
    completely. */
 
-static void consumed_from_buf(struct rw_buffer *buf,
+void ldapsrv_consumed_from_buf(struct rw_buffer *buf,
 				   size_t length)
 {
 	memcpy(buf->data, buf->data+length, buf->length-length);
@@ -136,7 +136,7 @@ static void peek_into_read_buf(struct rw_buffer *buf, uint8_t **out,
 	*out_length = buf->length;
 }
 
-static BOOL append_to_buf(struct rw_buffer *buf, uint8_t *data, size_t length)
+BOOL ldapsrv_append_to_buf(struct rw_buffer *buf, uint8_t *data, size_t length)
 {
 	buf->data = realloc(buf->data, buf->length+length);
 
@@ -161,7 +161,7 @@ static BOOL read_into_buf(struct socket_context *sock, struct rw_buffer *buf)
 		return False;
 	}
 
-	ret = append_to_buf(buf, tmp_blob.data, tmp_blob.length);
+	ret = ldapsrv_append_to_buf(buf, tmp_blob.data, tmp_blob.length);
 
 	talloc_free(tmp_blob.data);
 
@@ -179,7 +179,7 @@ static BOOL ldapsrv_read_buf(struct ldapsrv_connection *conn)
 	struct socket_context *sock = conn->connection->socket;
 	TALLOC_CTX *mem_ctx;
 
-	if (!conn->gensec ||
+	if (!conn->gensec || !conn->session_info ||
 	   !(gensec_have_feature(conn->gensec, GENSEC_WANT_SIGN) &&
 	     gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL))) {
 		return read_into_buf(sock, &conn->in_buffer);
@@ -198,7 +198,7 @@ static BOOL ldapsrv_read_buf(struct ldapsrv_connection *conn)
 		return False;
 	}
 
-	ret = append_to_buf(&conn->sasl_in_buffer, tmp_blob.data, tmp_blob.length);
+	ret = ldapsrv_append_to_buf(&conn->sasl_in_buffer, tmp_blob.data, tmp_blob.length);
 	if (!ret) {
 		talloc_free(mem_ctx);
 		return False;
@@ -254,13 +254,13 @@ static BOOL ldapsrv_read_buf(struct ldapsrv_connection *conn)
 		}
 	}
 
-	ret = append_to_buf(&conn->in_buffer, tmp_blob.data, tmp_blob.length);
+	ret = ldapsrv_append_to_buf(&conn->in_buffer, tmp_blob.data, tmp_blob.length);
 	if (!ret) {
 		talloc_free(mem_ctx);
 		return False;
 	}
 
-	consumed_from_buf(&conn->sasl_in_buffer, 4 + sasl_length);
+	ldapsrv_consumed_from_buf(&conn->sasl_in_buffer, 4 + sasl_length);
 
 	talloc_free(mem_ctx);
 	return ret;
@@ -281,7 +281,7 @@ static BOOL write_from_buf(struct socket_context *sock, struct rw_buffer *buf)
 		return False;
 	}
 
-	consumed_from_buf(buf, sendlen);
+	ldapsrv_consumed_from_buf(buf, sendlen);
 
 	return True;
 }
@@ -297,7 +297,7 @@ static BOOL ldapsrv_write_buf(struct ldapsrv_connection *conn)
 	struct socket_context *sock = conn->connection->socket;
 	TALLOC_CTX *mem_ctx;
 
-	if (!conn->gensec ||
+	if (!conn->gensec || !conn->session_info ||
 	   !(gensec_have_feature(conn->gensec, GENSEC_WANT_SIGN) &&
 	     gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL))) {
 		return write_from_buf(sock, &conn->out_buffer);
@@ -312,6 +312,10 @@ static BOOL ldapsrv_write_buf(struct ldapsrv_connection *conn)
 	tmp_blob.data = conn->out_buffer.data;
 	tmp_blob.length = conn->out_buffer.length;
 
+	if (tmp_blob.length == 0) {
+		goto nodata;
+	}
+
 	if (gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL)) {
 		status = gensec_seal_packet(conn->gensec, mem_ctx,
 					    tmp_blob.data, tmp_blob.length,
@@ -345,12 +349,15 @@ static BOOL ldapsrv_write_buf(struct ldapsrv_connection *conn)
 	memcpy(sasl.data + 4, creds.data, creds.length);
 	memcpy(sasl.data + 4 + creds.length, tmp_blob.data, tmp_blob.length);
 
-	ret = append_to_buf(&conn->sasl_out_buffer, sasl.data, sasl.length);
+	ret = ldapsrv_append_to_buf(&conn->sasl_out_buffer, sasl.data, sasl.length);
 	if (!ret) {
 		talloc_free(mem_ctx);
 		return False;
 	}
-	consumed_from_buf(&conn->out_buffer, tmp_blob.length);
+	ldapsrv_consumed_from_buf(&conn->out_buffer, tmp_blob.length);
+nodata:
+	tmp_blob.data = conn->sasl_out_buffer.data;
+	tmp_blob.length = conn->sasl_out_buffer.length;
 
 	status = socket_send(sock, mem_ctx, &tmp_blob, &sendlen, 0);
 	if (!NT_STATUS_IS_OK(status)) {
@@ -359,14 +366,14 @@ static BOOL ldapsrv_write_buf(struct ldapsrv_connection *conn)
 		return False;
 	}
 
-	consumed_from_buf(&conn->sasl_out_buffer, sendlen);
+	ldapsrv_consumed_from_buf(&conn->sasl_out_buffer, sendlen);
 
 	talloc_free(mem_ctx);
 
 	return True;
 }
 
-static BOOL ldap_append_to_buf(struct ldap_message *msg, struct rw_buffer *buf)
+static BOOL ldap_encode_to_buf(struct ldap_message *msg, struct rw_buffer *buf)
 {
 	DATA_BLOB blob;
 	BOOL res;
@@ -374,20 +381,20 @@ static BOOL ldap_append_to_buf(struct ldap_message *msg, struct rw_buffer *buf)
 	if (!ldap_encode(msg, &blob))
 		return False;
 
-	res = append_to_buf(buf, blob.data, blob.length);
+	res = ldapsrv_append_to_buf(buf, blob.data, blob.length);
 
 	data_blob_free(&blob);
 	return res;
 }
 
-static NTSTATUS ldapsrv_do_responses(struct ldapsrv_connection *conn)
+NTSTATUS ldapsrv_do_responses(struct ldapsrv_connection *conn)
 {
 	struct ldapsrv_call *call, *next_call = NULL;
 	struct ldapsrv_reply *reply, *next_reply = NULL;
 
 	for (call=conn->calls; call; call=next_call) {
 		for (reply=call->replies; reply; reply=next_reply) {
-			if (!ldap_append_to_buf(&reply->msg, &conn->out_buffer)) {
+			if (!ldap_encode_to_buf(&reply->msg, &conn->out_buffer)) {
 				return NT_STATUS_FOOBAR;
 			}
 			next_reply = reply->next;
@@ -404,6 +411,11 @@ static NTSTATUS ldapsrv_do_responses(struct ldapsrv_connection *conn)
 	return NT_STATUS_OK;
 }
 
+NTSTATUS ldapsrv_flush_responses(struct ldapsrv_connection *conn)
+{
+	return NT_STATUS_OK;
+}
+
 /*
   called when a LDAP socket becomes readable
 */
@@ -462,8 +474,6 @@ static void ldapsrv_recv(struct server_connection *conn, time_t t,
 		ZERO_STRUCTP(call);
 		call->state = LDAPSRV_CALL_STATE_NEW;
 		call->conn = ldap_conn;
-		/* TODO: we should use talloc_reference() here */
-		call->session_info = ldap_conn->session_info;
 		call->request.mem_ctx = call;
 
 		if (!ldap_decode(&data, &call->request)) {
@@ -478,7 +488,7 @@ static void ldapsrv_recv(struct server_connection *conn, time_t t,
 		DLIST_ADD_END(ldap_conn->calls, call,
 			      struct ldapsrv_call *);
 
-		consumed_from_buf(&ldap_conn->in_buffer, msg_length);
+		ldapsrv_consumed_from_buf(&ldap_conn->in_buffer, msg_length);
 
 		status = ldapsrv_do_call(call);
 		if (!NT_STATUS_IS_OK(status)) {
diff --git a/source4/ldap_server/ldap_server.h b/source4/ldap_server/ldap_server.h
index e88b266b0a..6d4824bc9d 100644
--- a/source4/ldap_server/ldap_server.h
+++ b/source4/ldap_server/ldap_server.h
@@ -45,8 +45,6 @@ struct ldapsrv_call {
 
 	struct ldapsrv_connection *conn;
 
-	const struct auth_session_info *session_info;
-
 	struct ldap_message request;
 
 	struct ldapsrv_reply {
@@ -62,7 +60,7 @@ struct ldapsrv_connection {
 	struct server_connection *connection;
 
 	struct gensec_security *gensec;
-	const struct auth_session_info *session_info;
+	struct auth_session_info *session_info;
 
 	struct rw_buffer sasl_in_buffer;
 	struct rw_buffer sasl_out_buffer;