dcerpc_connect.c

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	NTSTATUS status = composite_wait(c);
	
	talloc_free(c);
	return status;
}


struct pipe_connect_state {
	struct dcerpc_pipe *pipe;
	struct dcerpc_binding *binding;
	const struct ndr_interface_table *table;
	struct cli_credentials *credentials;
	struct loadparm_context *lp_ctx;
};


static void continue_map_binding(struct composite_context *ctx);
static void continue_connect(struct composite_context *c, struct pipe_connect_state *s);
static void continue_pipe_connect_ncacn_np_smb2(struct composite_context *ctx);
static void continue_pipe_connect_ncacn_np_smb(struct composite_context *ctx);
static void continue_pipe_connect_ncacn_ip_tcp(struct composite_context *ctx);
static void continue_pipe_connect_ncacn_unix(struct composite_context *ctx);
static void continue_pipe_connect_ncalrpc(struct composite_context *ctx);
static void continue_pipe_connect(struct composite_context *c, struct pipe_connect_state *s);
static void continue_pipe_auth(struct composite_context *ctx);


/*
  Stage 2 of pipe_connect_b: Receive result of endpoint mapping
*/
static void continue_map_binding(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);
	
	c->status = dcerpc_epm_map_binding_recv(ctx);
	if (!composite_is_ok(c)) return;

	DEBUG(2,("Mapped to DCERPC endpoint %s\n", s->binding->endpoint));
	
	continue_connect(c, s);
}


/*
  Stage 2 of pipe_connect_b: Continue connection after endpoint is known
*/
static void continue_connect(struct composite_context *c, struct pipe_connect_state *s)
{
	struct dcerpc_pipe_connect pc;

	/* potential exits to another stage by sending an async request */
	struct composite_context *ncacn_np_smb2_req;
	struct composite_context *ncacn_np_smb_req;
	struct composite_context *ncacn_ip_tcp_req;
	struct composite_context *ncacn_unix_req;
	struct composite_context *ncalrpc_req;

	/* dcerpc pipe connect input parameters */
	pc.pipe         = s->pipe;
	pc.binding      = s->binding;
	pc.interface    = s->table;
	pc.creds        = s->credentials;
	pc.resolve_ctx  = lp_resolve_context(s->lp_ctx);

	/* connect dcerpc pipe depending on required transport */
	switch (s->binding->transport) {
	case NCACN_NP:
		if (pc.binding->flags & DCERPC_SMB2) {
			/* new varient of SMB a.k.a. SMB2 */
			ncacn_np_smb2_req = dcerpc_pipe_connect_ncacn_np_smb2_send(c, &pc, s->lp_ctx);
			composite_continue(c, ncacn_np_smb2_req, continue_pipe_connect_ncacn_np_smb2, c);
			return;

		} else {
			/* good old ordinary SMB */
			ncacn_np_smb_req = dcerpc_pipe_connect_ncacn_np_smb_send(c, &pc, s->lp_ctx);
			composite_continue(c, ncacn_np_smb_req, continue_pipe_connect_ncacn_np_smb, c);
			return;
		}
		break;

	case NCACN_IP_TCP:
		ncacn_ip_tcp_req = dcerpc_pipe_connect_ncacn_ip_tcp_send(c, &pc);
		composite_continue(c, ncacn_ip_tcp_req, continue_pipe_connect_ncacn_ip_tcp, c);
		return;

	case NCACN_UNIX_STREAM:
		ncacn_unix_req = dcerpc_pipe_connect_ncacn_unix_stream_send(c, &pc);
		composite_continue(c, ncacn_unix_req, continue_pipe_connect_ncacn_unix, c);
		return;

	case NCALRPC:
		ncalrpc_req = dcerpc_pipe_connect_ncalrpc_send(c, &pc, s->lp_ctx);
		composite_continue(c, ncalrpc_req, continue_pipe_connect_ncalrpc, c);
		return;

	default:
		/* looks like a transport we don't support now */
		composite_error(c, NT_STATUS_NOT_SUPPORTED);
	}
}


/*
  Stage 3 of pipe_connect_b: Receive result of pipe connect request on
  named pipe on smb2
*/
static void continue_pipe_connect_ncacn_np_smb2(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);

	c->status = dcerpc_pipe_connect_ncacn_np_smb2_recv(ctx);
	if (!composite_is_ok(c)) return;

	continue_pipe_connect(c, s);
}


/*
  Stage 3 of pipe_connect_b: Receive result of pipe connect request on
  named pipe on smb
*/
static void continue_pipe_connect_ncacn_np_smb(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);

	c->status = dcerpc_pipe_connect_ncacn_np_smb_recv(ctx);
	if (!composite_is_ok(c)) return;
	
	continue_pipe_connect(c, s);
}


/*
  Stage 3 of pipe_connect_b: Receive result of pipe connect request on tcp/ip
*/
static void continue_pipe_connect_ncacn_ip_tcp(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);

	c->status = dcerpc_pipe_connect_ncacn_ip_tcp_recv(ctx);
	if (!composite_is_ok(c)) return;

	continue_pipe_connect(c, s);
}


/*
  Stage 3 of pipe_connect_b: Receive result of pipe connect request on unix socket
*/
static void continue_pipe_connect_ncacn_unix(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);
	
	c->status = dcerpc_pipe_connect_ncacn_unix_stream_recv(ctx);
	if (!composite_is_ok(c)) return;
	
	continue_pipe_connect(c, s);
}


/*
  Stage 3 of pipe_connect_b: Receive result of pipe connect request on local rpc
*/
static void continue_pipe_connect_ncalrpc(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data,
						       struct pipe_connect_state);
	
	c->status = dcerpc_pipe_connect_ncalrpc_recv(ctx);
	if (!composite_is_ok(c)) return;

	continue_pipe_connect(c, s);
}


/*
  Stage 4 of pipe_connect_b: Start an authentication on connected dcerpc pipe
  depending on credentials and binding flags passed.
*/
static void continue_pipe_connect(struct composite_context *c, struct pipe_connect_state *s)
{
	struct composite_context *auth_bind_req;

	s->pipe->binding = s->binding;
	if (!talloc_reference(s->pipe, s->binding)) {
		composite_error(c, NT_STATUS_NO_MEMORY);
		return;
	}

	auth_bind_req = dcerpc_pipe_auth_send(s->pipe, s->binding, s->table,
					      s->credentials, s->lp_ctx);
	composite_continue(c, auth_bind_req, continue_pipe_auth, c);
}


/*
  Stage 5 of pipe_connect_b: Receive result of pipe authentication request
  and say if all went ok
*/
static void continue_pipe_auth(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_connect_state *s = talloc_get_type(c->private_data, struct pipe_connect_state);

	c->status = dcerpc_pipe_auth_recv(ctx, s, &s->pipe);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  handle timeouts of a dcerpc connect
*/
static void dcerpc_connect_timeout_handler(struct event_context *ev, struct timed_event *te, 
					   struct timeval t, void *private)
{
	struct composite_context *c = talloc_get_type(private, struct composite_context);
	composite_error(c, NT_STATUS_IO_TIMEOUT);
}

/*
  start a request to open a rpc connection to a rpc pipe, using
  specified binding structure to determine the endpoint and options
*/
_PUBLIC_ struct composite_context* dcerpc_pipe_connect_b_send(TALLOC_CTX *parent_ctx,
						     struct dcerpc_binding *binding,
						     const struct ndr_interface_table *table,
						     struct cli_credentials *credentials,
						     struct event_context *ev,
						     struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	struct pipe_connect_state *s;
	struct event_context *new_ev = NULL;

	/* composite context allocation and setup */
	c = composite_create(parent_ctx, ev);
	if (c == NULL) {
		talloc_free(new_ev);
		return NULL;
	}
	talloc_steal(c, new_ev);

	s = talloc_zero(c, struct pipe_connect_state);
	if (composite_nomem(s, c)) return c;
	c->private_data = s;

	/* initialise dcerpc pipe structure */
	s->pipe = dcerpc_pipe_init(c, ev, lp_iconv_convenience(lp_ctx));
	if (composite_nomem(s->pipe, c)) return c;

	/* store parameters in state structure */
	s->binding      = binding;
	s->table        = table;
	s->credentials  = credentials;
	s->lp_ctx 	= lp_ctx;

	event_add_timed(c->event_ctx, c,
			timeval_current_ofs(DCERPC_REQUEST_TIMEOUT, 0),
			dcerpc_connect_timeout_handler, c);
	
	switch (s->binding->transport) {
	case NCA_UNKNOWN: {
		struct composite_context *binding_req;
		binding_req = dcerpc_epm_map_binding_send(c, s->binding, s->table,
							  s->pipe->conn->event_ctx,
							  s->lp_ctx);
		composite_continue(c, binding_req, continue_map_binding, c);
		return c;
		}

	case NCACN_NP:
	case NCACN_IP_TCP:
	case NCALRPC:
		if (!s->binding->endpoint) {
			struct composite_context *binding_req;
			binding_req = dcerpc_epm_map_binding_send(c, s->binding, s->table,
								  s->pipe->conn->event_ctx,
								  s->lp_ctx);
			composite_continue(c, binding_req, continue_map_binding, c);
			return c;
		}

	default:
		break;
	}

	continue_connect(c, s);
	return c;
}


/*
  receive result of a request to open a rpc connection to a rpc pipe
*/
_PUBLIC_ NTSTATUS dcerpc_pipe_connect_b_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
				    struct dcerpc_pipe **p)
{
	NTSTATUS status;
	struct pipe_connect_state *s;
	
	status = composite_wait(c);
	
	if (NT_STATUS_IS_OK(status)) {
		s = talloc_get_type(c->private_data, struct pipe_connect_state);
		talloc_steal(mem_ctx, s->pipe);
		*p = s->pipe;
	}
	talloc_free(c);
	return status;
}


/*
  open a rpc connection to a rpc pipe, using the specified 
  binding structure to determine the endpoint and options - sync version
*/
_PUBLIC_ NTSTATUS dcerpc_pipe_connect_b(TALLOC_CTX *parent_ctx,
			       struct dcerpc_pipe **pp,
			       struct dcerpc_binding *binding,
			       const struct ndr_interface_table *table,
			       struct cli_credentials *credentials,
			       struct event_context *ev,
			       struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	
	c = dcerpc_pipe_connect_b_send(parent_ctx, binding, table,
				       credentials, ev, lp_ctx);
	return dcerpc_pipe_connect_b_recv(c, parent_ctx, pp);
}


struct pipe_conn_state {
	struct dcerpc_pipe *pipe;
};


static void continue_pipe_connect_b(struct composite_context *ctx);


/*
  Initiate rpc connection to a rpc pipe, using the specified string
  binding to determine the endpoint and options.
  The string is to be parsed to a binding structure first.
*/
_PUBLIC_ struct composite_context* dcerpc_pipe_connect_send(TALLOC_CTX *parent_ctx,
						   const char *binding,
						   const struct ndr_interface_table *table,
						   struct cli_credentials *credentials,
						   struct event_context *ev, struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	struct pipe_conn_state *s;
	struct dcerpc_binding *b;
	struct composite_context *pipe_conn_req;

	/* composite context allocation and setup */
	c = composite_create(parent_ctx, ev);
	if (c == NULL) {
		return NULL;
	}

	s = talloc_zero(c, struct pipe_conn_state);
	if (composite_nomem(s, c)) return c;
	c->private_data = s;

	/* parse binding string to the structure */
	c->status = dcerpc_parse_binding(c, binding, &b);
	if (!NT_STATUS_IS_OK(c->status)) {
		DEBUG(0, ("Failed to parse dcerpc binding '%s'\n", binding));
		composite_error(c, c->status);
		return c;
	}

	DEBUG(3, ("Using binding %s\n", dcerpc_binding_string(c, b)));

	/* 
	   start connecting to a rpc pipe after binding structure
	   is established
	 */
	pipe_conn_req = dcerpc_pipe_connect_b_send(c, b, table,
						   credentials, ev, lp_ctx);
	composite_continue(c, pipe_conn_req, continue_pipe_connect_b, c);
	return c;
}


/*
  Stage 2 of pipe_connect: Receive result of actual pipe connect request
  and say if we're done ok
*/
static void continue_pipe_connect_b(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_conn_state *s = talloc_get_type(c->private_data,
						    struct pipe_conn_state);

	c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
	talloc_steal(s, s->pipe);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  Receive result of pipe connect (using binding string) request
  and return connected pipe structure.
*/
NTSTATUS dcerpc_pipe_connect_recv(struct composite_context *c,
				  TALLOC_CTX *mem_ctx,
				  struct dcerpc_pipe **pp)
{
	NTSTATUS status;
	struct pipe_conn_state *s;

	status = composite_wait(c);
	if (NT_STATUS_IS_OK(status)) {
		s = talloc_get_type(c->private_data, struct pipe_conn_state);
		*pp = talloc_steal(mem_ctx, s->pipe);
	}
	talloc_free(c);
	return status;
}


/*
  Open a rpc connection to a rpc pipe, using the specified string
  binding to determine the endpoint and options - sync version
*/
_PUBLIC_ NTSTATUS dcerpc_pipe_connect(TALLOC_CTX *parent_ctx, 
			     struct dcerpc_pipe **pp, 
			     const char *binding,
			     const struct ndr_interface_table *table,
			     struct cli_credentials *credentials,
			     struct event_context *ev,
			     struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	c = dcerpc_pipe_connect_send(parent_ctx, binding, 
				     table, credentials, ev, lp_ctx);
	return dcerpc_pipe_connect_recv(c, parent_ctx, pp);
}