source/libcli/smb2/session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SMB2 client session handling
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/raw/libcliraw.h"
  24 #include "libcli/smb2/smb2.h"
  25 #include "libcli/smb2/smb2_calls.h"
  26 #include "libcli/composite/composite.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "param/param.h"
  29
  30 /**
  31   initialise a smb2_session structure
  32  */
  33 struct smb2_session *smb2_session_init(struct smb2_transport *transport,
  34                                        TALLOC_CTX *parent_ctx, bool primary)
  35 {
  36         struct smb2_session *session;
  37         NTSTATUS status;
  38
  39         session = talloc_zero(parent_ctx, struct smb2_session);
  40         if (!session) {
  41                 return NULL;
  42         }
  43         if (primary) {
  44                 session->transport = talloc_steal(session, transport);
  45         } else {
  46                 session->transport = talloc_reference(session, transport);
  47         }
  48
  49         /* prepare a gensec context for later use */
  50         status = gensec_client_start(session, &session->gensec,
  51                                      session->transport->socket->event.ctx,
  52                                      global_loadparm);
  53         if (!NT_STATUS_IS_OK(status)) {
  54                 talloc_free(session);
  55                 return NULL;
  56         }
  57
  58         gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
  59
  60         return session;
  61 }
  62
  63 /**
  64   send a session setup request
  65 */
  66 struct smb2_request *smb2_session_setup_send(struct smb2_session *session,
  67                                              struct smb2_session_setup *io)
  68 {
  69         struct smb2_request *req;
  70         NTSTATUS status;
  71
  72         req = smb2_request_init(session->transport, SMB2_OP_SESSSETUP,
  73                                 0x18, true, io->in.secblob.length);
  74         if (req == NULL) return NULL;
  75
  76         SBVAL(req->out.hdr,  SMB2_HDR_UID, session->uid);
  77         SSVAL(req->out.body, 0x02, io->in._pad); /* pad */
  78         SIVAL(req->out.body, 0x04, io->in.unknown2);
  79         SIVAL(req->out.body, 0x08, io->in.unknown3);
  80
  81         req->session = session;
  82
  83         status = smb2_push_o16s16_blob(&req->out, 0x0C, io->in.secblob);
  84         if (!NT_STATUS_IS_OK(status)) {
  85                 talloc_free(req);
  86                 return NULL;
  87         }
  88         SBVAL(req->out.body, 0x10, io->in.unknown4);
  89
  90         smb2_transport_send(req);
  91
  92         return req;
  93 }
  94
  95
  96 /**
  97   recv a session setup reply
  98 */
  99 NTSTATUS smb2_session_setup_recv(struct smb2_request *req, TALLOC_CTX *mem_ctx,
 100                                  struct smb2_session_setup *io)
 101 {
 102         NTSTATUS status;
 103
 104         if (!smb2_request_receive(req) ||
 105             (smb2_request_is_error(req) &&
 106              !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 107                 return smb2_request_destroy(req);
 108         }
 109
 110         SMB2_CHECK_PACKET_RECV(req, 0x08, true);
 111
 112         io->out._pad     = SVAL(req->in.body, 0x02);
 113         io->out.uid      = BVAL(req->in.hdr,  SMB2_HDR_UID);
 114
 115         status = smb2_pull_o16s16_blob(&req->in, mem_ctx, req->in.body+0x04, &io->out.secblob);
 116         if (!NT_STATUS_IS_OK(status)) {
 117                 smb2_request_destroy(req);
 118                 return status;
 119         }
 120
 121         return smb2_request_destroy(req);
 122 }
 123
 124 /*
 125   sync session setup request
 126 */
 127 NTSTATUS smb2_session_setup(struct smb2_session *session,
 128                             TALLOC_CTX *mem_ctx, struct smb2_session_setup *io)
 129 {
 130         struct smb2_request *req = smb2_session_setup_send(session, io);
 131         return smb2_session_setup_recv(req, mem_ctx, io);
 132 }
 133
 134
 135 struct smb2_session_state {
 136         struct smb2_session_setup io;
 137         struct smb2_request *req;
 138         NTSTATUS gensec_status;
 139 };
 140
 141 /*
 142   handle continuations of the spnego session setup
 143 */
 144 static void session_request_handler(struct smb2_request *req)
 145 {
 146         struct composite_context *c = talloc_get_type(req->async.private,
 147                                                       struct composite_context);
 148         struct smb2_session_state *state = talloc_get_type(c->private_data,
 149                                                            struct smb2_session_state);
 150         struct smb2_session *session = req->session;
 151
 152         c->status = smb2_session_setup_recv(req, c, &state->io);
 153         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 154             (NT_STATUS_IS_OK(c->status) &&
 155              NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 156                 NTSTATUS session_key_err;
 157                 DATA_BLOB session_key;
 158                 c->status = gensec_update(session->gensec, c,
 159                                           state->io.out.secblob,
 160                                           &state->io.in.secblob);
 161                 state->gensec_status = c->status;
 162
 163                 session_key_err = gensec_session_key(session->gensec, &session_key);
 164                 if (NT_STATUS_IS_OK(session_key_err)) {
 165                         session->session_key = session_key;
 166                 }
 167         }
 168
 169         session->uid = state->io.out.uid;
 170
 171         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 172                 state->req = smb2_session_setup_send(session, &state->io);
 173                 if (state->req == NULL) {
 174                         composite_error(c, NT_STATUS_NO_MEMORY);
 175                         return;
 176                 }
 177
 178                 state->req->async.fn = session_request_handler;
 179                 state->req->async.private = c;
 180                 return;
 181         }
 182
 183         if (!NT_STATUS_IS_OK(c->status)) {
 184                 composite_error(c, c->status);
 185                 return;
 186         }
 187
 188         composite_done(c);
 189 }
 190
 191 /*
 192   a composite function that does a full SPNEGO session setup
 193  */
 194 struct composite_context *smb2_session_setup_spnego_send(struct smb2_session *session,
 195                                                          struct cli_credentials *credentials)
 196 {
 197         struct composite_context *c;
 198         struct smb2_session_state *state;
 199
 200         c = composite_create(session, session->transport->socket->event.ctx);
 201         if (c == NULL) return NULL;
 202
 203         state = talloc(c, struct smb2_session_state);
 204         if (composite_nomem(state, c)) return c;
 205         c->private_data = state;
 206
 207         ZERO_STRUCT(state->io);
 208         state->io.in._pad = 0x0000;
 209         state->io.in.unknown2 = 0x0000000F;
 210         state->io.in.unknown3 = 0x00000000;
 211         state->io.in.unknown4 = 0; /* uint64_t */
 212
 213         c->status = gensec_set_credentials(session->gensec, credentials);
 214         if (!composite_is_ok(c)) return c;
 215
 216         c->status = gensec_set_target_hostname(session->gensec,
 217                                                session->transport->socket->hostname);
 218         if (!composite_is_ok(c)) return c;
 219
 220         c->status = gensec_set_target_service(session->gensec, "cifs");
 221         if (!composite_is_ok(c)) return c;
 222
 223         c->status = gensec_start_mech_by_oid(session->gensec, GENSEC_OID_SPNEGO);
 224         if (!composite_is_ok(c)) return c;
 225
 226         c->status = gensec_update(session->gensec, c,
 227                                   session->transport->negotiate.secblob,
 228                                   &state->io.in.secblob);
 229         if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 230                 composite_error(c, c->status);
 231                 return c;
 232         }
 233         state->gensec_status = c->status;
 234
 235         state->req = smb2_session_setup_send(session, &state->io);
 236         composite_continue_smb2(c, state->req, session_request_handler, c);
 237         return c;
 238 }
 239
 240 /*
 241   receive a composite session setup reply
 242 */
 243 NTSTATUS smb2_session_setup_spnego_recv(struct composite_context *c)
 244 {
 245         NTSTATUS status;
 246         status = composite_wait(c);
 247         talloc_free(c);
 248         return status;
 249 }
 250
 251 /*
 252   sync version of smb2_session_setup_spnego
 253 */
 254 NTSTATUS smb2_session_setup_spnego(struct smb2_session *session,
 255                                    struct cli_credentials *credentials)
 256 {
 257         struct composite_context *c = smb2_session_setup_spnego_send(session, credentials);
 258         return smb2_session_setup_spnego_recv(c);
 259 }