source: vendor/current/source4/libcli/smb2/connect.c

/* 
   Unix SMB/CIFS implementation.

   SMB2 composite connection setup

   Copyright (C) Andrew Tridgell 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 <tevent.h>
#include "lib/util/tevent_ntstatus.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/raw/raw_proto.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "libcli/composite/composite.h"
#include "libcli/resolve/resolve.h"
#include "param/param.h"
#include "auth/credentials/credentials.h"
#include "../libcli/smb/smbXcli_base.h"

struct smb2_connect_state {
        struct tevent_context *ev;
        struct cli_credentials *credentials;
        uint64_t previous_session_id;
        struct resolve_context *resolve_ctx;
        const char *host;
        const char *share;
        const char *unc;
        const char **ports;
        const char *socket_options;
        struct nbt_name calling, called;
        struct gensec_settings *gensec_settings;
        struct smbcli_options options;
        struct smb2_transport *transport;
        struct smb2_session *session;
        struct smb2_tree *tree;
};

static void smb2_connect_socket_done(struct composite_context *creq);

/*
  a composite function that does a full negprot/sesssetup/tcon, returning
  a connected smb2_tree
 */
struct tevent_req *smb2_connect_send(TALLOC_CTX *mem_ctx,
                                     struct tevent_context *ev,
                                     const char *host,
                                     const char **ports,
                                     const char *share,
                                     struct resolve_context *resolve_ctx,
                                     struct cli_credentials *credentials,
                                     uint64_t previous_session_id,
                                     const struct smbcli_options *options,
                                     const char *socket_options,
                                     struct gensec_settings *gensec_settings)
{
        struct tevent_req *req;
        struct smb2_connect_state *state;
        struct composite_context *creq;
        static const char *default_ports[] = { "445", "139", NULL };

        req = tevent_req_create(mem_ctx, &state,
                                struct smb2_connect_state);
        if (req == NULL) {
                return NULL;
        }

        state->ev = ev;
        state->credentials = credentials;
        state->previous_session_id = previous_session_id;
        state->options = *options;
        state->host = host;
        state->ports = ports;
        state->share = share;
        state->resolve_ctx = resolve_ctx;
        state->socket_options = socket_options;
        state->gensec_settings = gensec_settings;

        if (state->ports == NULL) {
                state->ports = default_ports;
        }

        make_nbt_name_client(&state->calling,
                             cli_credentials_get_workstation(credentials));

        nbt_choose_called_name(state, &state->called,
                               host, NBT_NAME_SERVER);

        state->unc = talloc_asprintf(state, "\\\\%s\\%s",
                                    state->host, state->share);
        if (tevent_req_nomem(state->unc, req)) {
                return tevent_req_post(req, ev);
        }

        creq = smbcli_sock_connect_send(state, NULL, state->ports,
                                        state->host, state->resolve_ctx,
                                        state->ev, state->socket_options,
                                        &state->calling,
                                        &state->called);
        if (tevent_req_nomem(creq, req)) {
                return tevent_req_post(req, ev);
        }
        creq->async.fn = smb2_connect_socket_done;
        creq->async.private_data = req;

        return req;
}

static void smb2_connect_negprot_done(struct tevent_req *subreq);

static void smb2_connect_socket_done(struct composite_context *creq)
{
        struct tevent_req *req =
                talloc_get_type_abort(creq->async.private_data,
                struct tevent_req);
        struct smb2_connect_state *state =
                tevent_req_data(req,
                struct smb2_connect_state);
        struct smbcli_socket *sock;
        struct tevent_req *subreq;
        NTSTATUS status;
        uint32_t timeout_msec;
        enum protocol_types min_protocol;

        status = smbcli_sock_connect_recv(creq, state, &sock);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        state->transport = smb2_transport_init(sock, state, &state->options);
        if (tevent_req_nomem(state->transport, req)) {
                return;
        }

        timeout_msec = state->transport->options.request_timeout * 1000;
        min_protocol = state->transport->options.min_protocol;
        if (min_protocol < PROTOCOL_SMB2_02) {
                min_protocol = PROTOCOL_SMB2_02;
        }

        subreq = smbXcli_negprot_send(state, state->ev,
                                      state->transport->conn, timeout_msec,
                                      min_protocol,
                                      state->transport->options.max_protocol);
        if (tevent_req_nomem(subreq, req)) {
                return;
        }
        tevent_req_set_callback(subreq, smb2_connect_negprot_done, req);
}

static void smb2_connect_session_done(struct tevent_req *subreq);

static void smb2_connect_negprot_done(struct tevent_req *subreq)
{
        struct tevent_req *req =
                tevent_req_callback_data(subreq,
                struct tevent_req);
        struct smb2_connect_state *state =
                tevent_req_data(req,
                struct smb2_connect_state);
        struct smb2_transport *transport = state->transport;
        NTSTATUS status;

        status = smbXcli_negprot_recv(subreq);
        TALLOC_FREE(subreq);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        /* This is a hack... */
        smb2cli_conn_set_max_credits(transport->conn, 30);

        state->session = smb2_session_init(transport, state->gensec_settings, state);
        if (tevent_req_nomem(state->session, req)) {
                return;
        }

        subreq = smb2_session_setup_spnego_send(state, state->ev,
                                                state->session,
                                                state->credentials,
                                                state->previous_session_id);
        if (tevent_req_nomem(subreq, req)) {
                return;
        }
        tevent_req_set_callback(subreq, smb2_connect_session_done, req);
}

static void smb2_connect_tcon_done(struct tevent_req *subreq);

static void smb2_connect_session_done(struct tevent_req *subreq)
{
        struct tevent_req *req =
                tevent_req_callback_data(subreq,
                struct tevent_req);
        struct smb2_connect_state *state =
                tevent_req_data(req,
                struct smb2_connect_state);
        NTSTATUS status;
        uint32_t timeout_msec;

        status = smb2_session_setup_spnego_recv(subreq);
        TALLOC_FREE(subreq);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        state->tree = smb2_tree_init(state->session, state, true);
        if (tevent_req_nomem(state->tree, req)) {
                return;
        }

        timeout_msec = state->transport->options.request_timeout * 1000;

        subreq = smb2cli_tcon_send(state, state->ev,
                                   state->transport->conn,
                                   timeout_msec,
                                   state->session->smbXcli,
                                   state->tree->smbXcli,
                                   0, /* flags */
                                   state->unc);
        if (tevent_req_nomem(subreq, req)) {
                return;
        }
        tevent_req_set_callback(subreq, smb2_connect_tcon_done, req);
}

static void smb2_connect_tcon_done(struct tevent_req *subreq)
{
        struct tevent_req *req =
                tevent_req_callback_data(subreq,
                struct tevent_req);
        NTSTATUS status;

        status = smb2cli_tcon_recv(subreq);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        tevent_req_done(req);
}

NTSTATUS smb2_connect_recv(struct tevent_req *req,
                           TALLOC_CTX *mem_ctx,
                           struct smb2_tree **tree)
{
        struct smb2_connect_state *state =
                tevent_req_data(req,
                struct smb2_connect_state);
        NTSTATUS status;

        if (tevent_req_is_nterror(req, &status)) {
                tevent_req_received(req);
                return status;
        }

        *tree = talloc_move(mem_ctx, &state->tree);

        tevent_req_received(req);
        return NT_STATUS_OK;
}

/*
  sync version of smb2_connect
*/
NTSTATUS smb2_connect_ext(TALLOC_CTX *mem_ctx,
                          const char *host,
                          const char **ports,
                          const char *share,
                          struct resolve_context *resolve_ctx,
                          struct cli_credentials *credentials,
                          uint64_t previous_session_id,
                          struct smb2_tree **tree,
                          struct tevent_context *ev,
                          const struct smbcli_options *options,
                          const char *socket_options,
                          struct gensec_settings *gensec_settings)
{
        struct tevent_req *subreq;
        NTSTATUS status;
        bool ok;
        TALLOC_CTX *frame = talloc_stackframe();

        if (frame == NULL) {
                return NT_STATUS_NO_MEMORY;
        }

        subreq = smb2_connect_send(frame,
                                   ev,
                                   host,
                                   ports,
                                   share,
                                   resolve_ctx,
                                   credentials,
                                   previous_session_id,
                                   options,
                                   socket_options,
                                   gensec_settings);
        if (subreq == NULL) {
                TALLOC_FREE(frame);
                return NT_STATUS_NO_MEMORY;
        }

        ok = tevent_req_poll(subreq, ev);
        if (!ok) {
                status = map_nt_error_from_unix_common(errno);
                TALLOC_FREE(frame);
                return status;
        }

        status = smb2_connect_recv(subreq, mem_ctx, tree);
        TALLOC_FREE(subreq);
        if (!NT_STATUS_IS_OK(status)) {
                TALLOC_FREE(frame);
                return status;
        }

        TALLOC_FREE(frame);
        return NT_STATUS_OK;
}

NTSTATUS smb2_connect(TALLOC_CTX *mem_ctx,
                      const char *host,
                      const char **ports,
                      const char *share,
                      struct resolve_context *resolve_ctx,
                      struct cli_credentials *credentials,
                      struct smb2_tree **tree,
                      struct tevent_context *ev,
                      struct smbcli_options *options,
                      const char *socket_options,
                      struct gensec_settings *gensec_settings)
{
        NTSTATUS status;

        status = smb2_connect_ext(mem_ctx, host, ports, share, resolve_ctx,
                                  credentials,
                                  0, /* previous_session_id */
                                  tree, ev, options, socket_options,
                                  gensec_settings);

        return status;
}