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 #include "auth/auth.h"
  26 #include "smb_server/smb_server.h"
  27
  28
  29 /*
  30   setup the OS, Lanman and domain portions of a session setup reply
  31 */
  32 static void sesssetup_common_strings(struct smbsrv_request *req,
  33                                      char **os, char **lanman, char **domain)
  34 {
  35         (*os) = talloc_asprintf(req, "Unix");
  36         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  37         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  38 }
  39
  40
  41 /*
  42   handler for old style session setup
  43 */
  44 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  45 {
  46         NTSTATUS status;
  47         struct auth_usersupplied_info *user_info = NULL;
  48         struct auth_serversupplied_info *server_info = NULL;
  49         struct auth_session_info *session_info;
  50
  51         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
  52         char *remote_machine;
  53         if (!mem_ctx) {
  54                 return NT_STATUS_NO_MEMORY;
  55         }
  56
  57         if (!req->smb_conn->negotiate.done_sesssetup) {
  58                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  59         }
  60
  61         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
  62         status = make_user_info_for_reply_enc(req->smb_conn,
  63                                               &user_info,
  64                                               sess->old.in.user, sess->old.in.domain,
  65                                               remote_machine,
  66                                               sess->old.in.password,
  67                                               data_blob(NULL, 0));
  68         if (!NT_STATUS_IS_OK(status)) {
  69                 talloc_free(mem_ctx);
  70                 return NT_STATUS_ACCESS_DENIED;
  71         }
  72
  73         status = req->smb_conn->negotiate.auth_context->check_ntlm_password(req->smb_conn->negotiate.auth_context,
  74                                                                             user_info,
  75                                                                             mem_ctx,
  76                                                                             &server_info);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 talloc_free(mem_ctx);
  79                 return nt_status_squash(status);
  80         }
  81
  82         /* This references server_info into session_info */
  83         status = make_session_info(req, server_info, &session_info);
  84         talloc_free(mem_ctx);
  85         if (!NT_STATUS_IS_OK(status)) {
  86                 return nt_status_squash(status);
  87         }
  88
  89         sess->old.out.action = 0;
  90         sess->old.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
  91         if (sess->old.out.vuid == UID_FIELD_INVALID) {
  92                 return NT_STATUS_ACCESS_DENIED;
  93         }
  94         sesssetup_common_strings(req,
  95                                  &sess->old.out.os,
  96                                  &sess->old.out.lanman,
  97                                  &sess->old.out.domain);
  98
  99         req->session = smbsrv_session_find(req->smb_conn, sess->old.out.vuid);
 100
 101         return NT_STATUS_OK;
 102 }
 103
 104
 105 /*
 106   handler for NT1 style session setup
 107 */
 108 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 109 {
 110         NTSTATUS status;
 111         struct auth_usersupplied_info *user_info = NULL;
 112         struct auth_serversupplied_info *server_info = NULL;
 113         struct auth_session_info *session_info;
 114         TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
 115
 116         if (!mem_ctx) {
 117                 return NT_STATUS_NO_MEMORY;
 118         }
 119
 120         if (!req->smb_conn->negotiate.done_sesssetup) {
 121                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 122                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 123         }
 124
 125         if (req->smb_conn->negotiate.spnego_negotiated) {
 126                 struct auth_context *auth_context;
 127
 128                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 129                         return NT_STATUS_ACCESS_DENIED;
 130                 } else {
 131                         make_user_info_guest(req->smb_conn, &user_info);
 132                 }
 133
 134                 status = make_auth_context_subsystem(req->smb_conn, &auth_context);
 135
 136                 if (!NT_STATUS_IS_OK(status)) {
 137                         talloc_free(mem_ctx);
 138                         return status;
 139                 }
 140
 141                 status = auth_context->check_ntlm_password(auth_context,
 142                                                            user_info,
 143                                                            mem_ctx,
 144                                                            &server_info);
 145         } else {
 146                 char *remote_machine;
 147                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 148                 status = make_user_info_for_reply_enc(req->smb_conn,
 149                                                       &user_info,
 150                                                       sess->nt1.in.user, sess->nt1.in.domain,
 151                                                       remote_machine,
 152                                                       sess->nt1.in.password1,
 153                                                       sess->nt1.in.password2);
 154                 if (!NT_STATUS_IS_OK(status)) {
 155                         talloc_free(mem_ctx);
 156                         return NT_STATUS_ACCESS_DENIED;
 157                 }
 158
 159                 status = req->smb_conn->negotiate
 160                         .auth_context->check_ntlm_password(req->smb_conn->negotiate
 161                                                            .auth_context,
 162                                                            user_info,
 163                                                            req,
 164                                                            &server_info);
 165         }
 166
 167         if (!NT_STATUS_IS_OK(status)) {
 168                 talloc_free(mem_ctx);
 169                 return nt_status_squash(status);
 170         }
 171
 172         /* This references server_info into session_info */
 173         status = make_session_info(mem_ctx, server_info, &session_info);
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 talloc_free(mem_ctx);
 176                 return nt_status_squash(status);
 177         }
 178
 179         sess->nt1.out.action = 0;
 180         sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
 181         talloc_free(mem_ctx);
 182         if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
 183                 return NT_STATUS_ACCESS_DENIED;
 184         }
 185         sesssetup_common_strings(req,
 186                                  &sess->nt1.out.os,
 187                                  &sess->nt1.out.lanman,
 188                                  &sess->nt1.out.domain);
 189
 190         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 191         if (session_info->server_info->guest) {
 192                 return NT_STATUS_OK;
 193         }
 194         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 195                 /* Already signing, or disabled */
 196                 return NT_STATUS_OK;
 197         }
 198
 199         /* Force check of the request packet, now we know the session key */
 200         req_signing_check_incoming(req);
 201
 202         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 203
 204         return NT_STATUS_OK;
 205 }
 206
 207
 208 /*
 209   handler for SPNEGO style session setup
 210 */
 211 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 212 {
 213         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 214         struct smbsrv_session *smb_sess;
 215         struct gensec_security *gensec_ctx = NULL;
 216         struct auth_session_info *session_info = NULL;
 217         uint16_t vuid;
 218
 219         if (!req->smb_conn->negotiate.done_sesssetup) {
 220                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 221                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 222         }
 223
 224         vuid = SVAL(req->in.hdr,HDR_UID);
 225         smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 226         if (smb_sess && !smb_sess->session_info) {
 227                 if (!smb_sess->gensec_ctx) {
 228                         return NT_STATUS_INVALID_HANDLE;
 229                 }
 230
 231                 status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 232         } else {
 233                 smb_sess = NULL;
 234
 235                 status = gensec_server_start(req->smb_conn, &gensec_ctx);
 236                 if (!NT_STATUS_IS_OK(status)) {
 237                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 238                         return status;
 239                 }
 240
 241                 gensec_set_target_service(gensec_ctx, "cifs");
 242
 243                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 244
 245                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 246                 if (!NT_STATUS_IS_OK(status)) {
 247                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 248                         return status;
 249                 }
 250
 251                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 252
 253         }
 254
 255         if (!smb_sess) {
 256                 vuid = smbsrv_register_session(req->smb_conn,
 257                                                session_info, gensec_ctx);
 258                 if (vuid == UID_FIELD_INVALID) {
 259                         return NT_STATUS_ACCESS_DENIED;
 260                 }
 261                 smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 262                 if (!smb_sess) {
 263                         return NT_STATUS_FOOBAR;
 264                 }
 265         }
 266
 267         if (NT_STATUS_IS_OK(status)) {
 268                 DATA_BLOB session_key;
 269
 270                 status = gensec_session_info(smb_sess->gensec_ctx, &smb_sess->session_info);
 271                 if (!NT_STATUS_IS_OK(status)) {
 272                         return status;
 273                 }
 274
 275                 status = gensec_session_key(smb_sess->gensec_ctx,
 276                                             &session_key);
 277                 if (NT_STATUS_IS_OK(status)
 278                     && !smb_sess->session_info->server_info->guest
 279                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 280                         /* Force check of the request packet, now we know the session key */
 281                         req_signing_check_incoming(req);
 282
 283                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 284
 285                 }
 286         } else {
 287                 status = nt_status_squash(status);
 288                 if (smb_sess->gensec_ctx &&
 289                     !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 290                         gensec_end(&smb_sess->gensec_ctx);
 291                 }
 292         }
 293
 294         sess->spnego.out.action = 0;
 295         sess->spnego.out.vuid = vuid;
 296         sesssetup_common_strings(req,
 297                                  &sess->spnego.out.os,
 298                                  &sess->spnego.out.lanman,
 299                                  &sess->spnego.out.domain);
 300
 301         return status;
 302 }
 303
 304 /*
 305   backend for sessionsetup call - this takes all 3 variants of the call
 306 */
 307 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 308                            union smb_sesssetup *sess)
 309 {
 310         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 311
 312         switch (sess->generic.level) {
 313                 case RAW_SESSSETUP_GENERIC:
 314                         status = NT_STATUS_INVALID_LEVEL;
 315                         break;
 316                 case RAW_SESSSETUP_OLD:
 317                         status = sesssetup_old(req, sess);
 318                         break;
 319                 case RAW_SESSSETUP_NT1:
 320                         status = sesssetup_nt1(req, sess);
 321                         break;
 322                 case RAW_SESSSETUP_SPNEGO:
 323                         status = sesssetup_spnego(req, sess);
 324                         break;
 325         }
 326
 327         if (NT_STATUS_IS_OK(status)) {
 328                 req->smb_conn->negotiate.done_sesssetup = True;
 329         }
 330
 331         return status;
 332 }
 333
 334