dcerpc_connect.c

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/* 
   Unix SMB/CIFS implementation.

   dcerpc connect functions

   Copyright (C) Andrew Tridgell 2003
   Copyright (C) Jelmer Vernooij 2004
   Copyright (C) Andrew Bartlett <[e-mail]> 2005-2007
   Copyright (C) Rafal Szczesniak  2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


#include "includes.h"
#include "libcli/composite/composite.h"
#include "libcli/smb_composite/smb_composite.h"
#include "lib/events/events.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "librpc/rpc/dcerpc.h"
#include "librpc/rpc/dcerpc_proto.h"
#include "auth/credentials/credentials.h"
#include "param/param.h"
#include "libcli/resolve/resolve.h"


struct pipe_np_smb_state {
	struct smb_composite_connect conn;
	struct smbcli_tree *tree;
	struct dcerpc_pipe_connect io;
};


/*
  Stage 3 of ncacn_np_smb: Named pipe opened (or not)
*/
static void continue_pipe_open_smb(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);

	/* receive result of named pipe open request on smb */
	c->status = dcerpc_pipe_open_smb_recv(ctx);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  Stage 2 of ncacn_np_smb: Open a named pipe after successful smb connection
*/
static void continue_smb_connect(struct composite_context *ctx)
{
	struct composite_context *open_ctx;
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_np_smb_state *s = talloc_get_type(c->private_data,
						      struct pipe_np_smb_state);
	
	/* receive result of smb connect request */
	c->status = smb_composite_connect_recv(ctx, c);
	if (!composite_is_ok(c)) return;

	/* prepare named pipe open parameters */
	s->tree         = s->conn.out.tree;
	s->io.pipe_name = s->io.binding->endpoint;

	/* send named pipe open request */
	open_ctx = dcerpc_pipe_open_smb_send(s->io.pipe, s->tree, s->io.pipe_name);
	if (composite_nomem(open_ctx, c)) return;

	composite_continue(c, open_ctx, continue_pipe_open_smb, c);
}


/*
  Initiate async open of a rpc connection to a rpc pipe on SMB using
  the binding structure to determine the endpoint and options
*/
static struct composite_context *dcerpc_pipe_connect_ncacn_np_smb_send(TALLOC_CTX *mem_ctx, struct dcerpc_pipe_connect *io, struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	struct pipe_np_smb_state *s;
	struct composite_context *conn_req;
	struct smb_composite_connect *conn;

	/* composite context allocation and setup */
	c = composite_create(mem_ctx, io->pipe->conn->event_ctx);
	if (c == NULL) return NULL;

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

	s->io  = *io;
	conn   = &s->conn;

	/* prepare smb connection parameters: we're connecting to IPC$ share on
	   remote rpc server */
	conn->in.dest_host              = s->io.binding->host;
	conn->in.dest_ports                  = lp_smb_ports(lp_ctx);
	if (s->io.binding->target_hostname == NULL)
		conn->in.called_name = "*SMBSERVER"; /* FIXME: This is invalid */
	else
		conn->in.called_name            = s->io.binding->target_hostname;
	conn->in.service                = "IPC$";
	conn->in.service_type           = NULL;
	conn->in.workgroup		= lp_workgroup(lp_ctx);

	lp_smbcli_options(lp_ctx, &conn->in.options);

	/*
	 * provide proper credentials - user supplied, but allow a
	 * fallback to anonymous if this is an schannel connection
	 * (might be NT4 not allowing machine logins at session
	 * setup).
	 */
	s->conn.in.credentials = s->io.creds;
	if (s->io.binding->flags & DCERPC_SCHANNEL) {
		conn->in.fallback_to_anonymous  = true;
	} else {
		conn->in.fallback_to_anonymous  = false;
	}

	/* send smb connect request */
	conn_req = smb_composite_connect_send(conn, s->io.pipe->conn, 
					      lp_resolve_context(lp_ctx), 
					      s->io.pipe->conn->event_ctx);
	if (composite_nomem(conn_req, c)) return c;

	composite_continue(c, conn_req, continue_smb_connect, c);
	return c;
}


/*
  Receive result of a rpc connection to a rpc pipe on SMB
*/
static NTSTATUS dcerpc_pipe_connect_ncacn_np_smb_recv(struct composite_context *c)
{
	NTSTATUS status = composite_wait(c);

	talloc_free(c);
	return status;
}


struct pipe_np_smb2_state {
	struct smb2_tree *tree;
	struct dcerpc_pipe_connect io;
};


/*
  Stage 3 of ncacn_np_smb: Named pipe opened (or not)
*/
static void continue_pipe_open_smb2(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);

	/* receive result of named pipe open request on smb2 */
	c->status = dcerpc_pipe_open_smb2_recv(ctx);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  Stage 2 of ncacn_np_smb2: Open a named pipe after successful smb2 connection
*/
static void continue_smb2_connect(struct composite_context *ctx)
{
	struct composite_context *open_req;
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);
	struct pipe_np_smb2_state *s = talloc_get_type(c->private_data,
						       struct pipe_np_smb2_state);

	/* receive result of smb2 connect request */
	c->status = smb2_connect_recv(ctx, c, &s->tree);
	if (!composite_is_ok(c)) return;

	/* prepare named pipe open parameters */
	s->io.pipe_name = s->io.binding->endpoint;

	/* send named pipe open request */
	open_req = dcerpc_pipe_open_smb2_send(s->io.pipe, s->tree, s->io.pipe_name);
	if (composite_nomem(open_req, c)) return;

	composite_continue(c, open_req, continue_pipe_open_smb2, c);
}


/* 
   Initiate async open of a rpc connection request on SMB2 using
   the binding structure to determine the endpoint and options
*/
static struct composite_context *dcerpc_pipe_connect_ncacn_np_smb2_send(
					TALLOC_CTX *mem_ctx,
					struct dcerpc_pipe_connect *io,
					struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	struct pipe_np_smb2_state *s;
	struct composite_context *conn_req;
	struct smbcli_options options;

	/* composite context allocation and setup */
	c = composite_create(mem_ctx, io->pipe->conn->event_ctx);
	if (c == NULL) return NULL;

	s = talloc_zero(c, struct pipe_np_smb2_state);
	if (composite_nomem(s, c)) return c;
	c->private_data = s;

	s->io = *io;

	/*
	 * provide proper credentials - user supplied or anonymous in case this is
	 * schannel connection
	 */
	if (s->io.binding->flags & DCERPC_SCHANNEL) {
		s->io.creds = cli_credentials_init(mem_ctx);
		if (composite_nomem(s->io.creds, c)) return c;

		cli_credentials_guess(s->io.creds, lp_ctx);
	}

	lp_smbcli_options(lp_ctx, &options);

	/* send smb2 connect request */
	conn_req = smb2_connect_send(mem_ctx, s->io.binding->host, "IPC$", 
				     s->io.resolve_ctx,
				     s->io.creds,
				     c->event_ctx,
				     &options);
	composite_continue(c, conn_req, continue_smb2_connect, c);
	return c;
}


/*
  Receive result of a rpc connection to a rpc pipe on SMB2
*/
static NTSTATUS dcerpc_pipe_connect_ncacn_np_smb2_recv(struct composite_context *c)
{
	NTSTATUS status = composite_wait(c);
	
	talloc_free(c);
	return status;
}


struct pipe_ip_tcp_state {
	struct dcerpc_pipe_connect io;
	const char *host;
	const char *target_hostname;
	uint32_t port;
};


/*
  Stage 2 of ncacn_ip_tcp: rpc pipe opened (or not)
*/
static void continue_pipe_open_ncacn_ip_tcp(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);

	/* receive result of named pipe open request on tcp/ip */
	c->status = dcerpc_pipe_open_tcp_recv(ctx);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  Initiate async open of a rpc connection to a rpc pipe on TCP/IP using
  the binding structure to determine the endpoint and options
*/
static struct composite_context* dcerpc_pipe_connect_ncacn_ip_tcp_send(TALLOC_CTX *mem_ctx,
								       struct dcerpc_pipe_connect *io)
{
	struct composite_context *c;
	struct pipe_ip_tcp_state *s;
	struct composite_context *pipe_req;

	/* composite context allocation and setup */
	c = composite_create(mem_ctx, io->pipe->conn->event_ctx);
	if (c == NULL) return NULL;

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

	/* store input parameters in state structure */
	s->io               = *io;
	s->host             = talloc_reference(c, io->binding->host);
	s->target_hostname  = talloc_reference(c, io->binding->target_hostname);
                             /* port number is a binding endpoint here */
	s->port             = atoi(io->binding->endpoint);   

	/* send pipe open request on tcp/ip */
	pipe_req = dcerpc_pipe_open_tcp_send(s->io.pipe->conn, s->host, s->target_hostname, 
					     s->port, io->resolve_ctx);
	composite_continue(c, pipe_req, continue_pipe_open_ncacn_ip_tcp, c);
	return c;
}


/*
  Receive result of a rpc connection to a rpc pipe on TCP/IP
*/
static NTSTATUS dcerpc_pipe_connect_ncacn_ip_tcp_recv(struct composite_context *c)
{
	NTSTATUS status = composite_wait(c);
	
	talloc_free(c);
	return status;
}


struct pipe_unix_state {
	struct dcerpc_pipe_connect io;
	const char *path;
};


/*
  Stage 2 of ncacn_unix: rpc pipe opened (or not)
*/
static void continue_pipe_open_ncacn_unix_stream(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);

	/* receive result of pipe open request on unix socket */
	c->status = dcerpc_pipe_open_unix_stream_recv(ctx);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/*
  Initiate async open of a rpc connection to a rpc pipe on unix socket using
  the binding structure to determine the endpoint and options
*/
static struct composite_context* dcerpc_pipe_connect_ncacn_unix_stream_send(TALLOC_CTX *mem_ctx,
									    struct dcerpc_pipe_connect *io)
{
	struct composite_context *c;
	struct pipe_unix_state *s;
	struct composite_context *pipe_req;

	/* composite context allocation and setup */
	c = composite_create(mem_ctx, io->pipe->conn->event_ctx);
	if (c == NULL) return NULL;

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

	/* prepare pipe open parameters and store them in state structure
	   also, verify whether biding endpoint is not null */
	s->io = *io;
	
	if (!io->binding->endpoint) {
		DEBUG(0, ("Path to unix socket not specified\n"));
		composite_error(c, NT_STATUS_INVALID_PARAMETER);
		return c;
	}

	s->path  = talloc_strdup(c, io->binding->endpoint);  /* path is a binding endpoint here */
	if (composite_nomem(s->path, c)) return c;

	/* send pipe open request on unix socket */
	pipe_req = dcerpc_pipe_open_unix_stream_send(s->io.pipe->conn, s->path);
	composite_continue(c, pipe_req, continue_pipe_open_ncacn_unix_stream, c);
	return c;
}


/*
  Receive result of a rpc connection to a pipe on unix socket
*/
static NTSTATUS dcerpc_pipe_connect_ncacn_unix_stream_recv(struct composite_context *c)
{
	NTSTATUS status = composite_wait(c);

	talloc_free(c);
	return status;
}


struct pipe_ncalrpc_state {
	struct dcerpc_pipe_connect io;
};

static NTSTATUS dcerpc_pipe_connect_ncalrpc_recv(struct composite_context *c);

/*
  Stage 2 of ncalrpc: rpc pipe opened (or not)
*/
static void continue_pipe_open_ncalrpc(struct composite_context *ctx)
{
	struct composite_context *c = talloc_get_type(ctx->async.private_data,
						      struct composite_context);

	/* receive result of pipe open request on ncalrpc */
	c->status = dcerpc_pipe_connect_ncalrpc_recv(ctx);
	if (!composite_is_ok(c)) return;

	composite_done(c);
}


/* 
   Initiate async open of a rpc connection request on NCALRPC using
   the binding structure to determine the endpoint and options
*/
static struct composite_context* dcerpc_pipe_connect_ncalrpc_send(TALLOC_CTX *mem_ctx,
								  struct dcerpc_pipe_connect *io, struct loadparm_context *lp_ctx)
{
	struct composite_context *c;
	struct pipe_ncalrpc_state *s;
	struct composite_context *pipe_req;

	/* composite context allocation and setup */
	c = composite_create(mem_ctx, io->pipe->conn->event_ctx);
	if (c == NULL) return NULL;

	s = talloc_zero(c, struct pipe_ncalrpc_state);
	if (composite_nomem(s, c)) return c;
	c->private_data = s;
	
	/* store input parameters in state structure */
	s->io  = *io;

	/* send pipe open request */
	pipe_req = dcerpc_pipe_open_pipe_send(s->io.pipe->conn, lp_ncalrpc_dir(lp_ctx), 
					      s->io.binding->endpoint);
	composite_continue(c, pipe_req, continue_pipe_open_ncalrpc, c);
	return c;
}


/*
  Receive result of a rpc connection to a rpc pipe on NCALRPC
*/
static NTSTATUS dcerpc_pipe_connect_ncalrpc_recv(struct composite_context *c)
{