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         char *remote_machine;
  51         TALLOC_CTX *mem_ctx;
  52
  53         mem_ctx = talloc_named(req, 0, "OLD session setup");
  54         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
  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                                               sess->old.in.user, sess->old.in.domain,
  63                                               remote_machine,
  64                                               sess->old.in.password,
  65                                               data_blob(NULL, 0),
  66                                               &user_info);
  67         if (!NT_STATUS_IS_OK(status)) {
  68                 talloc_free(mem_ctx);
  69                 return NT_STATUS_ACCESS_DENIED;
  70         }
  71
  72         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  73                                      mem_ctx, user_info, &server_info);
  74         if (!NT_STATUS_IS_OK(status)) {
  75                 talloc_free(mem_ctx);
  76                 return auth_nt_status_squash(status);
  77         }
  78
  79         /* This references server_info into session_info */
  80         status = auth_generate_session_info(req, server_info, &session_info);
  81         talloc_free(mem_ctx);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 return auth_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;
 112
 113         mem_ctx = talloc_named(req, 0, "NT1 session setup");
 114         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
 115
 116         if (!req->smb_conn->negotiate.done_sesssetup) {
 117                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 118                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 119         }
 120
 121         if (req->smb_conn->negotiate.spnego_negotiated) {
 122                 struct auth_context *auth_context;
 123
 124                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 125                         return NT_STATUS_ACCESS_DENIED;
 126                 }
 127
 128                 status = make_user_info_anonymous(req->smb_conn, &user_info);
 129                 if (!NT_STATUS_IS_OK(status)) {
 130                         talloc_free(mem_ctx);
 131                         return status;
 132                 }
 133
 134                 /* TODO: should we use just "anonymous" here? */
 135                 status = auth_context_create(req->smb_conn, lp_auth_methods(), &auth_context);
 136                 if (!NT_STATUS_IS_OK(status)) {
 137                         talloc_free(mem_ctx);
 138                         return status;
 139                 }
 140
 141                 status = auth_check_password(auth_context, mem_ctx,
 142                                              user_info, &server_info);
 143         } else {
 144                 char *remote_machine;
 145
 146                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 147
 148                 status = make_user_info_for_reply_enc(req->smb_conn,
 149                                                       sess->nt1.in.user, sess->nt1.in.domain,
 150                                                       remote_machine,
 151                                                       sess->nt1.in.password1,
 152                                                       sess->nt1.in.password2,
 153                                                       &user_info);
 154                 if (!NT_STATUS_IS_OK(status)) {
 155                         talloc_free(mem_ctx);
 156                         return NT_STATUS_ACCESS_DENIED;
 157                 }
 158
 159                 status = auth_check_password(req->smb_conn->negotiate.auth_context,
 160                                              req, user_info, &server_info);
 161         }
 162
 163         if (!NT_STATUS_IS_OK(status)) {
 164                 talloc_free(mem_ctx);
 165                 return auth_nt_status_squash(status);
 166         }
 167
 168         /* This references server_info into session_info */
 169         status = auth_generate_session_info(mem_ctx, server_info, &session_info);
 170         if (!NT_STATUS_IS_OK(status)) {
 171                 talloc_free(mem_ctx);
 172                 return auth_nt_status_squash(status);
 173         }
 174
 175         sess->nt1.out.action = 0;
 176         sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
 177         talloc_free(mem_ctx);
 178         if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
 179                 return NT_STATUS_ACCESS_DENIED;
 180         }
 181         sesssetup_common_strings(req,
 182                                  &sess->nt1.out.os,
 183                                  &sess->nt1.out.lanman,
 184                                  &sess->nt1.out.domain);
 185
 186         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 187         if (!session_info->server_info->authenticated) {
 188                 return NT_STATUS_OK;
 189         }
 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_set_target_service(gensec_ctx, "cifs");
 239
 240                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 241
 242                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_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->authenticated
 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 = auth_nt_status_squash(status);
 285                 if (smb_sess->gensec_ctx &&
 286                     !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 287                         talloc_free(smb_sess->gensec_ctx);
 288                         smb_sess->gensec_ctx = NULL;
 289                 }
 290         }
 291
 292         sess->spnego.out.action = 0;
 293         sess->spnego.out.vuid = vuid;
 294         sesssetup_common_strings(req,
 295                                  &sess->spnego.out.os,
 296                                  &sess->spnego.out.lanman,
 297                                  &sess->spnego.out.domain);
 298
 299         return status;
 300 }
 301
 302 /*
 303   backend for sessionsetup call - this takes all 3 variants of the call
 304 */
 305 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 306                            union smb_sesssetup *sess)
 307 {
 308         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 309
 310         switch (sess->generic.level) {
 311                 case RAW_SESSSETUP_GENERIC:
 312                         status = NT_STATUS_INVALID_LEVEL;
 313                         break;
 314                 case RAW_SESSSETUP_OLD:
 315                         status = sesssetup_old(req, sess);
 316                         break;
 317                 case RAW_SESSSETUP_NT1:
 318                         status = sesssetup_nt1(req, sess);
 319                         break;
 320                 case RAW_SESSSETUP_SPNEGO:
 321                         status = sesssetup_spnego(req, sess);
 322                         break;
 323         }
 324
 325         if (NT_STATUS_IS_OK(status)) {
 326                 req->smb_conn->negotiate.done_sesssetup = True;
 327         }
 328
 329         return status;
 330 }
 331
 332