source4/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "libcli/composite/composite.h"
  28 #include "auth/gensec/gensec.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         if (!NT_STATUS_IS_OK(status)) {
  53                 talloc_free(session);
  54                 return NULL;
  55         }
  56
  57         gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
  58
  59         return session;
  60 }
  61
  62 /*
  63   send a session setup request
  64 */
  65 struct smb2_request *smb2_session_setup_send(struct smb2_session *session,
  66                                              struct smb2_session_setup *io)
  67 {
  68         struct smb2_request *req;
  69         NTSTATUS status;
  70
  71         req = smb2_request_init(session->transport, SMB2_OP_SESSSETUP,
  72                                 0x18, True, io->in.secblob.length);
  73         if (req == NULL) return NULL;
  74
  75         SBVAL(req->out.hdr,  SMB2_HDR_UID, session->uid);
  76         SSVAL(req->out.body, 0x02, io->in._pad); /* pad */
  77         SIVAL(req->out.body, 0x04, io->in.unknown2);
  78         SIVAL(req->out.body, 0x08, io->in.unknown3);
  79
  80         req->session = session;
  81
  82         status = smb2_push_o16s16_blob(&req->out, 0x0C, io->in.secblob);
  83         if (!NT_STATUS_IS_OK(status)) {
  84                 talloc_free(req);
  85                 return NULL;
  86         }
  87         SBVAL(req->out.body, 0x10, io->in.unknown4);
  88
  89         smb2_transport_send(req);
  90
  91         return req;
  92 }
  93
  94
  95 /*
  96   recv a session setup reply
  97 */
  98 NTSTATUS smb2_session_setup_recv(struct smb2_request *req, TALLOC_CTX *mem_ctx,
  99                                  struct smb2_session_setup *io)
 100 {
 101         NTSTATUS status;
 102
 103         if (!smb2_request_receive(req) ||
 104             (smb2_request_is_error(req) &&
 105              !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 106                 return smb2_request_destroy(req);
 107         }
 108
 109         SMB2_CHECK_PACKET_RECV(req, 0x08, True);
 110
 111         io->out._pad     = SVAL(req->in.body, 0x02);
 112         io->out.uid      = BVAL(req->in.hdr,  SMB2_HDR_UID);
 113
 114         status = smb2_pull_o16s16_blob(&req->in, mem_ctx, req->in.body+0x04, &io->out.secblob);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 smb2_request_destroy(req);
 117                 return status;
 118         }
 119
 120         return smb2_request_destroy(req);
 121 }
 122
 123 /*
 124   sync session setup request
 125 */
 126 NTSTATUS smb2_session_setup(struct smb2_session *session,
 127                             TALLOC_CTX *mem_ctx, struct smb2_session_setup *io)
 128 {
 129         struct smb2_request *req = smb2_session_setup_send(session, io);
 130         return smb2_session_setup_recv(req, mem_ctx, io);
 131 }
 132
 133
 134 struct smb2_session_state {
 135         struct smb2_session_setup io;
 136         struct smb2_request *req;
 137         NTSTATUS gensec_status;
 138 };
 139
 140 /*
 141   handle continuations of the spnego session setup
 142 */
 143 static void session_request_handler(struct smb2_request *req)
 144 {
 145         struct composite_context *c = talloc_get_type(req->async.private,
 146                                                       struct composite_context);
 147         struct smb2_session_state *state = talloc_get_type(c->private_data,
 148                                                            struct smb2_session_state);
 149         struct smb2_session *session = req->session;
 150
 151         c->status = smb2_session_setup_recv(req, c, &state->io);
 152         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 153             (NT_STATUS_IS_OK(c->status) &&
 154              NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 155                 NTSTATUS session_key_err;
 156                 DATA_BLOB session_key;
 157                 c->status = gensec_update(session->gensec, c,
 158                                           state->io.out.secblob,
 159                                           &state->io.in.secblob);
 160                 state->gensec_status = c->status;
 161
 162                 session_key_err = gensec_session_key(session->gensec, &session_key);
 163                 if (NT_STATUS_IS_OK(session_key_err)) {
 164                         session->session_key = session_key;
 165                 }
 166         }
 167
 168         session->uid = state->io.out.uid;
 169
 170         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 171                 state->req = smb2_session_setup_send(session, &state->io);
 172                 if (state->req == NULL) {
 173                         composite_error(c, NT_STATUS_NO_MEMORY);
 174                         return;
 175                 }
 176
 177                 state->req->async.fn = session_request_handler;
 178                 state->req->async.private = c;
 179                 return;
 180         }
 181
 182         if (!NT_STATUS_IS_OK(c->status)) {
 183                 composite_error(c, c->status);
 184                 return;
 185         }
 186
 187         composite_done(c);
 188 }
 189
 190 /*
 191   a composite function that does a full SPNEGO session setup
 192  */
 193 struct composite_context *smb2_session_setup_spnego_send(struct smb2_session *session,
 194                                                          struct cli_credentials *credentials)
 195 {
 196         struct composite_context *c;
 197         struct smb2_session_state *state;
 198
 199         c = composite_create(session, session->transport->socket->event.ctx);
 200         if (c == NULL) return NULL;
 201
 202         state = talloc(c, struct smb2_session_state);
 203         if (composite_nomem(state, c)) return c;
 204         c->private_data = state;
 205
 206         ZERO_STRUCT(state->io);
 207         state->io.in._pad = 0x0000;
 208         state->io.in.unknown2 = 0x0000000F;
 209         state->io.in.unknown3 = 0x00000000;
 210         state->io.in.unknown4 = 0; /* uint64_t */
 211
 212         c->status = gensec_set_credentials(session->gensec, credentials);
 213         if (!composite_is_ok(c)) return c;
 214
 215         c->status = gensec_set_target_hostname(session->gensec,
 216                                                session->transport->socket->hostname);
 217         if (!composite_is_ok(c)) return c;
 218
 219         c->status = gensec_set_target_service(session->gensec, "cifs");
 220         if (!composite_is_ok(c)) return c;
 221
 222         c->status = gensec_start_mech_by_oid(session->gensec, GENSEC_OID_SPNEGO);
 223         if (!composite_is_ok(c)) return c;
 224
 225         c->status = gensec_update(session->gensec, c,
 226                                   session->transport->negotiate.secblob,
 227                                   &state->io.in.secblob);
 228         if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 229                 composite_error(c, c->status);
 230                 return c;
 231         }
 232         state->gensec_status = c->status;
 233
 234         state->req = smb2_session_setup_send(session, &state->io);
 235         composite_continue_smb2(c, state->req, session_request_handler, c);
 236         return c;
 237 }
 238
 239 /*
 240   receive a composite session setup reply
 241 */
 242 NTSTATUS smb2_session_setup_spnego_recv(struct composite_context *c)
 243 {
 244         NTSTATUS status;
 245         status = composite_wait(c);
 246         talloc_free(c);
 247         return status;
 248 }
 249
 250 /*
 251   sync version of smb2_session_setup_spnego
 252 */
 253 NTSTATUS smb2_session_setup_spnego(struct smb2_session *session,
 254                                    struct cli_credentials *credentials)
 255 {
 256         struct composite_context *c = smb2_session_setup_spnego_send(session, credentials);
 257         return smb2_session_setup_spnego_recv(c);
 258 }