source4/smb_server/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    handle SMBsessionsetup
   4    Copyright (C) Andrew Tridgell 1998-2001
   5    Copyright (C) Andrew Bartlett      2001
   6    Copyright (C) Jim McDonough        2002
   7    Copyright (C) Luke Howard          2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /*
  27   setup the OS, Lanman and domain portions of a session setup reply
  28 */
  29 static void sesssetup_common_strings(struct smbsrv_request *req,
  30                                      char **os, char **lanman, char **domain)
  31 {
  32         (*os) = talloc_asprintf(req, "Unix");
  33         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  34         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  35 }
  36
  37
  38 /*
  39   handler for old style session setup
  40 */
  41 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  42 {
  43         NTSTATUS status;
  44         struct auth_usersupplied_info *user_info = NULL;
  45         struct auth_serversupplied_info *server_info = NULL;
  46         struct auth_session_info *session_info;
  47
  48         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
  49         char *remote_machine;
  50         if (!mem_ctx) {
  51                 return NT_STATUS_NO_MEMORY;
  52         }
  53
  54         if (!req->smb_conn->negotiate.done_sesssetup) {
  55                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  56         }
  57
  58         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
  59         status = make_user_info_for_reply_enc(req->smb_conn,
  60                                               &user_info,
  61                                               sess->old.in.user, sess->old.in.domain,
  62                                               remote_machine,
  63                                               sess->old.in.password,
  64                                               data_blob(NULL, 0));
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 talloc_free(mem_ctx);
  67                 return NT_STATUS_ACCESS_DENIED;
  68         }
  69
  70         status = req->smb_conn->negotiate.auth_context->check_ntlm_password(req->smb_conn->negotiate.auth_context,
  71                                                                             user_info,
  72                                                                             mem_ctx,
  73                                                                             &server_info);
  74         if (!NT_STATUS_IS_OK(status)) {
  75                 talloc_free(mem_ctx);
  76                 return nt_status_squash(status);
  77         }
  78
  79         /* This references server_info into session_info */
  80         status = make_session_info(req, server_info, &session_info);
  81         talloc_free(mem_ctx);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 return nt_status_squash(status);
  84         }
  85
  86         sess->old.out.action = 0;
  87         sess->old.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
  88         if (sess->old.out.vuid == UID_FIELD_INVALID) {
  89                 return NT_STATUS_ACCESS_DENIED;
  90         }
  91         sesssetup_common_strings(req,
  92                                  &sess->old.out.os,
  93                                  &sess->old.out.lanman,
  94                                  &sess->old.out.domain);
  95
  96         req->session = smbsrv_session_find(req->smb_conn, sess->old.out.vuid);
  97
  98         return NT_STATUS_OK;
  99 }
 100
 101
 102 /*
 103   handler for NT1 style session setup
 104 */
 105 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 106 {
 107         NTSTATUS status;
 108         struct auth_usersupplied_info *user_info = NULL;
 109         struct auth_serversupplied_info *server_info = NULL;
 110         struct auth_session_info *session_info;
 111         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
 112
 113         if (!mem_ctx) {
 114                 return NT_STATUS_NO_MEMORY;
 115         }
 116
 117         if (!req->smb_conn->negotiate.done_sesssetup) {
 118                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 119                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 120         }
 121
 122         if (req->smb_conn->negotiate.spnego_negotiated) {
 123                 struct auth_context *auth_context;
 124
 125                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 126                         return NT_STATUS_ACCESS_DENIED;
 127                 } else {
 128                         make_user_info_guest(req->smb_conn, &user_info);
 129                 }
 130
 131                 status = make_auth_context_subsystem(req->smb_conn, &auth_context);
 132
 133                 if (!NT_STATUS_IS_OK(status)) {
 134                         talloc_free(mem_ctx);
 135                         return status;
 136                 }
 137
 138                 status = auth_context->check_ntlm_password(auth_context,
 139                                                            user_info,
 140                                                            mem_ctx,
 141                                                            &server_info);
 142         } else {
 143                 char *remote_machine;
 144                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 145                 status = make_user_info_for_reply_enc(req->smb_conn,
 146                                                       &user_info,
 147                                                       sess->nt1.in.user, sess->nt1.in.domain,
 148                                                       remote_machine,
 149                                                       sess->nt1.in.password1,
 150                                                       sess->nt1.in.password2);
 151                 if (!NT_STATUS_IS_OK(status)) {
 152                         talloc_free(mem_ctx);
 153                         return NT_STATUS_ACCESS_DENIED;
 154                 }
 155
 156                 status = req->smb_conn->negotiate
 157                         .auth_context->check_ntlm_password(req->smb_conn->negotiate
 158                                                            .auth_context,
 159                                                            user_info,
 160                                                            req,
 161                                                            &server_info);
 162         }
 163
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 talloc_free(mem_ctx);
 166                 return nt_status_squash(status);
 167         }
 168
 169         /* This references server_info into session_info */
 170         status = make_session_info(mem_ctx, server_info, &session_info);
 171         if (!NT_STATUS_IS_OK(status)) {
 172                 talloc_free(mem_ctx);
 173                 return nt_status_squash(status);
 174         }
 175
 176         sess->nt1.out.action = 0;
 177         sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
 178         talloc_free(mem_ctx);
 179         if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
 180                 return NT_STATUS_ACCESS_DENIED;
 181         }
 182         sesssetup_common_strings(req,
 183                                  &sess->nt1.out.os,
 184                                  &sess->nt1.out.lanman,
 185                                  &sess->nt1.out.domain);
 186
 187         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 188         if (session_info->server_info->guest) {
 189                 return NT_STATUS_OK;
 190         }
 191         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 192                 /* Already signing, or disabled */
 193                 return NT_STATUS_OK;
 194         }
 195
 196         /* Force check of the request packet, now we know the session key */
 197         req_signing_check_incoming(req);
 198
 199         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 200
 201         return NT_STATUS_OK;
 202 }
 203
 204
 205 /*
 206   handler for SPNEGO style session setup
 207 */
 208 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 209 {
 210         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 211         struct smbsrv_session *smb_sess;
 212         struct gensec_security *gensec_ctx = NULL;
 213         struct auth_session_info *session_info = NULL;
 214         uint16_t vuid;
 215
 216         if (!req->smb_conn->negotiate.done_sesssetup) {
 217                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 218                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 219         }
 220
 221         vuid = SVAL(req->in.hdr,HDR_UID);
 222         smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 223         if (smb_sess && !smb_sess->session_info) {
 224                 if (!smb_sess->gensec_ctx) {
 225                         return NT_STATUS_INVALID_HANDLE;
 226                 }
 227
 228                 status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 229         } else {
 230                 smb_sess = NULL;
 231
 232                 status = gensec_server_start(req->smb_conn, &gensec_ctx);
 233                 if (!NT_STATUS_IS_OK(status)) {
 234                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 235                         return status;
 236                 }
 237
 238                 gensec_want_feature(gensec_ctx, GENSEC_WANT_SESSION_KEY);
 239
 240                 status = gensec_start_mech_by_oid(gensec_ctx, OID_SPNEGO);
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 243                         return status;
 244                 }
 245
 246                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 247
 248         }
 249
 250         if (!smb_sess) {
 251                 vuid = smbsrv_register_session(req->smb_conn,
 252                                                session_info, gensec_ctx);
 253                 if (vuid == UID_FIELD_INVALID) {
 254                         return NT_STATUS_ACCESS_DENIED;
 255                 }
 256                 smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 257                 if (!smb_sess) {
 258                         return NT_STATUS_FOOBAR;
 259                 }
 260         }
 261
 262         if (NT_STATUS_IS_OK(status)) {
 263                 DATA_BLOB session_key;
 264
 265                 status = gensec_session_info(smb_sess->gensec_ctx, &smb_sess->session_info);
 266                 if (!NT_STATUS_IS_OK(status)) {
 267                         return status;
 268                 }
 269
 270                 status = gensec_session_key(smb_sess->gensec_ctx,
 271                                             &session_key);
 272                 if (NT_STATUS_IS_OK(status)
 273                     && !smb_sess->session_info->server_info->guest
 274                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 275                         /* Force check of the request packet, now we know the session key */
 276                         req_signing_check_incoming(req);
 277
 278                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 279
 280                 }
 281         } else {
 282                 status = nt_status_squash(status);
 283                 if (smb_sess->gensec_ctx &&
 284                     !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 285                         gensec_end(&smb_sess->gensec_ctx);
 286                 }
 287         }
 288
 289         sess->spnego.out.action = 0;
 290         sess->spnego.out.vuid = vuid;
 291         sesssetup_common_strings(req,
 292                                  &sess->spnego.out.os,
 293                                  &sess->spnego.out.lanman,
 294                                  &sess->spnego.out.domain);
 295
 296         return status;
 297 }
 298
 299 /*
 300   backend for sessionsetup call - this takes all 3 variants of the call
 301 */
 302 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 303                            union smb_sesssetup *sess)
 304 {
 305         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 306
 307         switch (sess->generic.level) {
 308                 case RAW_SESSSETUP_GENERIC:
 309                         status = NT_STATUS_INVALID_LEVEL;
 310                         break;
 311                 case RAW_SESSSETUP_OLD:
 312                         status = sesssetup_old(req, sess);
 313                         break;
 314                 case RAW_SESSSETUP_NT1:
 315                         status = sesssetup_nt1(req, sess);
 316                         break;
 317                 case RAW_SESSSETUP_SPNEGO:
 318                         status = sesssetup_spnego(req, sess);
 319                         break;
 320         }
 321
 322         if (NT_STATUS_IS_OK(status)) {
 323                 req->smb_conn->negotiate.done_sesssetup = True;
 324         }
 325
 326         return status;
 327 }
 328
 329