source/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 #include "auth/auth.h"
  26 #include "asn_1.h"
  27
  28 /*
  29   setup the OS, Lanman and domain portions of a session setup reply
  30 */
  31 static void sesssetup_common_strings(struct smbsrv_request *req,
  32                                      char **os, char **lanman, char **domain)
  33 {
  34         (*os) = talloc_asprintf(req, "Unix");
  35         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  36         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  37 }
  38
  39
  40 /*
  41   handler for old style session setup
  42 */
  43 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  44 {
  45         NTSTATUS status;
  46         struct auth_usersupplied_info *user_info = NULL;
  47         struct auth_serversupplied_info *server_info = NULL;
  48         struct auth_session_info *session_info;
  49
  50         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
  51         char *remote_machine;
  52         if (!mem_ctx) {
  53                 return NT_STATUS_NO_MEMORY;
  54         }
  55
  56         if (!req->smb_conn->negotiate.done_sesssetup) {
  57                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  58         }
  59
  60         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
  61         status = make_user_info_for_reply_enc(req->smb_conn,
  62                                               &user_info,
  63                                               sess->old.in.user, sess->old.in.domain,
  64                                               remote_machine,
  65                                               sess->old.in.password,
  66                                               data_blob(NULL, 0));
  67         if (!NT_STATUS_IS_OK(status)) {
  68                 talloc_free(mem_ctx);
  69                 return NT_STATUS_ACCESS_DENIED;
  70         }
  71
  72         status = req->smb_conn->negotiate.auth_context->check_ntlm_password(req->smb_conn->negotiate.auth_context,
  73                                                                             user_info,
  74                                                                             mem_ctx,
  75                                                                             &server_info);
  76         if (!NT_STATUS_IS_OK(status)) {
  77                 talloc_free(mem_ctx);
  78                 return nt_status_squash(status);
  79         }
  80
  81         /* This references server_info into session_info */
  82         status = make_session_info(req, server_info, &session_info);
  83         talloc_free(mem_ctx);
  84         if (!NT_STATUS_IS_OK(status)) {
  85                 return nt_status_squash(status);
  86         }
  87
  88         sess->old.out.action = 0;
  89         sess->old.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
  90         if (sess->old.out.vuid == UID_FIELD_INVALID) {
  91                 return NT_STATUS_ACCESS_DENIED;
  92         }
  93         sesssetup_common_strings(req,
  94                                  &sess->old.out.os,
  95                                  &sess->old.out.lanman,
  96                                  &sess->old.out.domain);
  97
  98         req->session = smbsrv_session_find(req->smb_conn, sess->old.out.vuid);
  99
 100         return NT_STATUS_OK;
 101 }
 102
 103
 104 /*
 105   handler for NT1 style session setup
 106 */
 107 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 108 {
 109         NTSTATUS status;
 110         struct auth_usersupplied_info *user_info = NULL;
 111         struct auth_serversupplied_info *server_info = NULL;
 112         struct auth_session_info *session_info;
 113         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
 114
 115         if (!mem_ctx) {
 116                 return NT_STATUS_NO_MEMORY;
 117         }
 118
 119         if (!req->smb_conn->negotiate.done_sesssetup) {
 120                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 121                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 122         }
 123
 124         if (req->smb_conn->negotiate.spnego_negotiated) {
 125                 struct auth_context *auth_context;
 126
 127                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 128                         return NT_STATUS_ACCESS_DENIED;
 129                 } else {
 130                         make_user_info_guest(req->smb_conn, &user_info);
 131                 }
 132
 133                 status = make_auth_context_subsystem(req->smb_conn, &auth_context);
 134
 135                 if (!NT_STATUS_IS_OK(status)) {
 136                         talloc_free(mem_ctx);
 137                         return status;
 138                 }
 139
 140                 status = auth_context->check_ntlm_password(auth_context,
 141                                                            user_info,
 142                                                            mem_ctx,
 143                                                            &server_info);
 144         } else {
 145                 char *remote_machine;
 146                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 147                 status = make_user_info_for_reply_enc(req->smb_conn,
 148                                                       &user_info,
 149                                                       sess->nt1.in.user, sess->nt1.in.domain,
 150                                                       remote_machine,
 151                                                       sess->nt1.in.password1,
 152                                                       sess->nt1.in.password2);
 153                 if (!NT_STATUS_IS_OK(status)) {
 154                         talloc_free(mem_ctx);
 155                         return NT_STATUS_ACCESS_DENIED;
 156                 }
 157
 158                 status = req->smb_conn->negotiate
 159                         .auth_context->check_ntlm_password(req->smb_conn->negotiate
 160                                                            .auth_context,
 161                                                            user_info,
 162                                                            req,
 163                                                            &server_info);
 164         }
 165
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 talloc_free(mem_ctx);
 168                 return nt_status_squash(status);
 169         }
 170
 171         /* This references server_info into session_info */
 172         status = make_session_info(mem_ctx, server_info, &session_info);
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 talloc_free(mem_ctx);
 175                 return nt_status_squash(status);
 176         }
 177
 178         sess->nt1.out.action = 0;
 179         sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
 180         talloc_free(mem_ctx);
 181         if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
 182                 return NT_STATUS_ACCESS_DENIED;
 183         }
 184         sesssetup_common_strings(req,
 185                                  &sess->nt1.out.os,
 186                                  &sess->nt1.out.lanman,
 187                                  &sess->nt1.out.domain);
 188
 189         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 190         if (session_info->server_info->guest) {
 191                 return NT_STATUS_OK;
 192         }
 193         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 194                 /* Already signing, or disabled */
 195                 return NT_STATUS_OK;
 196         }
 197
 198         /* Force check of the request packet, now we know the session key */
 199         req_signing_check_incoming(req);
 200
 201         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 202
 203         return NT_STATUS_OK;
 204 }
 205
 206
 207 /*
 208   handler for SPNEGO style session setup
 209 */
 210 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 211 {
 212         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 213         struct smbsrv_session *smb_sess;
 214         struct gensec_security *gensec_ctx = NULL;
 215         struct auth_session_info *session_info = NULL;
 216         uint16_t vuid;
 217
 218         if (!req->smb_conn->negotiate.done_sesssetup) {
 219                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 220                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 221         }
 222
 223         vuid = SVAL(req->in.hdr,HDR_UID);
 224         smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 225         if (smb_sess && !smb_sess->session_info) {
 226                 if (!smb_sess->gensec_ctx) {
 227                         return NT_STATUS_INVALID_HANDLE;
 228                 }
 229
 230                 status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 231         } else {
 232                 smb_sess = NULL;
 233
 234                 status = gensec_server_start(req->smb_conn, &gensec_ctx);
 235                 if (!NT_STATUS_IS_OK(status)) {
 236                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 237                         return status;
 238                 }
 239
 240                 gensec_want_feature(gensec_ctx, GENSEC_WANT_SESSION_KEY);
 241
 242                 status = gensec_start_mech_by_oid(gensec_ctx, OID_SPNEGO);
 243                 if (!NT_STATUS_IS_OK(status)) {
 244                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 245                         return status;
 246                 }
 247
 248                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 249
 250         }
 251
 252         if (!smb_sess) {
 253                 vuid = smbsrv_register_session(req->smb_conn,
 254                                                session_info, gensec_ctx);
 255                 if (vuid == UID_FIELD_INVALID) {
 256                         return NT_STATUS_ACCESS_DENIED;
 257                 }
 258                 smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 259                 if (!smb_sess) {
 260                         return NT_STATUS_FOOBAR;
 261                 }
 262         }
 263
 264         if (NT_STATUS_IS_OK(status)) {
 265                 DATA_BLOB session_key;
 266
 267                 status = gensec_session_info(smb_sess->gensec_ctx, &smb_sess->session_info);
 268                 if (!NT_STATUS_IS_OK(status)) {
 269                         return status;
 270                 }
 271
 272                 status = gensec_session_key(smb_sess->gensec_ctx,
 273                                             &session_key);
 274                 if (NT_STATUS_IS_OK(status)
 275                     && !smb_sess->session_info->server_info->guest
 276                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 277                         /* Force check of the request packet, now we know the session key */
 278                         req_signing_check_incoming(req);
 279
 280                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 281
 282                 }
 283         } else {
 284                 status = nt_status_squash(status);
 285                 if (smb_sess->gensec_ctx &&
 286                     !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 287                         gensec_end(&smb_sess->gensec_ctx);
 288                 }
 289         }
 290
 291         sess->spnego.out.action = 0;
 292         sess->spnego.out.vuid = vuid;
 293         sesssetup_common_strings(req,
 294                                  &sess->spnego.out.os,
 295                                  &sess->spnego.out.lanman,
 296                                  &sess->spnego.out.domain);
 297
 298         return status;
 299 }
 300
 301 /*
 302   backend for sessionsetup call - this takes all 3 variants of the call
 303 */
 304 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 305                            union smb_sesssetup *sess)
 306 {
 307         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 308
 309         switch (sess->generic.level) {
 310                 case RAW_SESSSETUP_GENERIC:
 311                         status = NT_STATUS_INVALID_LEVEL;
 312                         break;
 313                 case RAW_SESSSETUP_OLD:
 314                         status = sesssetup_old(req, sess);
 315                         break;
 316                 case RAW_SESSSETUP_NT1:
 317                         status = sesssetup_nt1(req, sess);
 318                         break;
 319                 case RAW_SESSSETUP_SPNEGO:
 320                         status = sesssetup_spnego(req, sess);
 321                         break;
 322         }
 323
 324         if (NT_STATUS_IS_OK(status)) {
 325                 req->smb_conn->negotiate.done_sesssetup = True;
 326         }
 327
 328         return status;
 329 }
 330
 331