source3/rpc_server/rpc_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Generic infrstructure for RPC Daemons
   4    Copyright (C) Simo Sorce 2010
   5    Copyright (C) Andrew Bartlett 2011
   6    Copyright (C) Andreas Schneider 2011
   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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "librpc/rpc/dcesrv_core.h"
  24 #include "rpc_server/rpc_pipes.h"
  25 #include "rpc_server/rpc_server.h"
  26 #include "rpc_server/rpc_config.h"
  27 #include "rpc_dce.h"
  28 #include "librpc/gen_ndr/netlogon.h"
  29 #include "librpc/gen_ndr/auth.h"
  30 #include "lib/tsocket/tsocket.h"
  31 #include "libcli/named_pipe_auth/npa_tstream.h"
  32 #include "../auth/auth_sam_reply.h"
  33 #include "auth.h"
  34 #include "rpc_server/rpc_ncacn_np.h"
  35 #include "rpc_server/srv_pipe_hnd.h"
  36 #include "lib/util/idtree_random.h"
  37
  38 #undef DBGC_CLASS
  39 #define DBGC_CLASS DBGC_RPC_SRV
  40
  41 /* Start listening on the appropriate unix socket and setup all is needed to
  42  * dispatch requests to the pipes rpc implementation */
  43
  44 struct dcerpc_ncacn_listen_state {
  45         int fd;
  46
  47         struct tevent_context *ev_ctx;
  48         struct messaging_context *msg_ctx;
  49         struct dcesrv_context *dce_ctx;
  50         struct dcesrv_endpoint *endpoint;
  51         dcerpc_ncacn_termination_fn termination_fn;
  52         void *termination_data;
  53 };
  54
  55 static void ncacn_terminate_connection(struct dcerpc_ncacn_conn *conn,
  56                                        const char *reason);
  57
  58 NTSTATUS dcesrv_auth_gensec_prepare(
  59         TALLOC_CTX *mem_ctx,
  60         struct dcesrv_call_state *call,
  61         struct gensec_security **out,
  62         void *private_data)
  63 {
  64         struct gensec_security *gensec = NULL;
  65         NTSTATUS status;
  66
  67         if (out == NULL) {
  68                 return NT_STATUS_INVALID_PARAMETER;
  69         }
  70
  71         status = auth_generic_prepare(mem_ctx,
  72                                       call->conn->remote_address,
  73                                       call->conn->local_address,
  74                                       "DCE/RPC",
  75                                       &gensec);
  76         if (!NT_STATUS_IS_OK(status)) {
  77                 DBG_ERR("Failed to prepare gensec: %s\n", nt_errstr(status));
  78                 return status;
  79         }
  80
  81         *out = gensec;
  82
  83         return NT_STATUS_OK;
  84 }
  85
  86 void dcesrv_log_successful_authz(
  87         struct dcesrv_call_state *call,
  88         void *private_data)
  89 {
  90         TALLOC_CTX *frame = talloc_stackframe();
  91         struct auth4_context *auth4_context = NULL;
  92         struct dcesrv_auth *auth = call->auth_state;
  93         enum dcerpc_transport_t transport = dcerpc_binding_get_transport(
  94                         call->conn->endpoint->ep_description);
  95         const char *auth_type = derpc_transport_string_by_transport(transport);
  96         const char *transport_protection = AUTHZ_TRANSPORT_PROTECTION_NONE;
  97         NTSTATUS status;
  98
  99         if (frame == NULL) {
 100                 DBG_ERR("No memory\n");
 101                 return;
 102         }
 103
 104         if (transport == NCACN_NP) {
 105                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_SMB;
 106         }
 107
 108         become_root();
 109         status = make_auth4_context(frame, &auth4_context);
 110         unbecome_root();
 111         if (!NT_STATUS_IS_OK(status)) {
 112                 DBG_ERR("Unable to make auth context for authz log.\n");
 113                 TALLOC_FREE(frame);
 114                 return;
 115         }
 116
 117         /*
 118          * Log the authorization to this RPC interface.  This
 119          * covered ncacn_np pass-through auth, and anonymous
 120          * DCE/RPC (eg epmapper, netlogon etc)
 121          */
 122         log_successful_authz_event(auth4_context->msg_ctx,
 123                                    auth4_context->lp_ctx,
 124                                    call->conn->remote_address,
 125                                    call->conn->local_address,
 126                                    "DCE/RPC",
 127                                    auth_type,
 128                                    transport_protection,
 129                                    auth->session_info,
 130                                    NULL /* client_audit_info */,
 131                                    NULL /* server_audit_info */);
 132
 133         auth->auth_audited = true;
 134
 135         TALLOC_FREE(frame);
 136 }
 137
 138 static int dcesrv_assoc_group_destructor(struct dcesrv_assoc_group *assoc_group)
 139 {
 140         int ret;
 141         ret = idr_remove(assoc_group->dce_ctx->assoc_groups_idr,
 142                          assoc_group->id);
 143         if (ret != 0) {
 144                 DBG_ERR("Failed to remove assoc_group 0x%08x\n",
 145                         assoc_group->id);
 146         }
 147         return 0;
 148 }
 149
 150 static NTSTATUS dcesrv_assoc_group_new(struct dcesrv_call_state *call)
 151 {
 152         struct dcesrv_connection *conn = call->conn;
 153         struct dcesrv_context *dce_ctx = conn->dce_ctx;
 154         const struct dcesrv_endpoint *endpoint = conn->endpoint;
 155         enum dcerpc_transport_t transport =
 156                 dcerpc_binding_get_transport(endpoint->ep_description);
 157         struct dcesrv_assoc_group *assoc_group = NULL;
 158         int id;
 159
 160         assoc_group = talloc_zero(conn, struct dcesrv_assoc_group);
 161         if (assoc_group == NULL) {
 162                 return NT_STATUS_NO_MEMORY;
 163         }
 164
 165         id = idr_get_new_random(dce_ctx->assoc_groups_idr,
 166                                 assoc_group,
 167                                 1,
 168                                 UINT16_MAX);
 169         if (id == -1) {
 170                 TALLOC_FREE(assoc_group);
 171                 DBG_ERR("Out of association groups!\n");
 172                 return NT_STATUS_RPC_OUT_OF_RESOURCES;
 173         }
 174
 175         assoc_group->transport = transport;
 176         assoc_group->id = id;
 177         assoc_group->dce_ctx = dce_ctx;
 178
 179         call->conn->assoc_group = assoc_group;
 180
 181         talloc_set_destructor(assoc_group, dcesrv_assoc_group_destructor);
 182
 183         return NT_STATUS_OK;
 184 }
 185
 186 static NTSTATUS dcesrv_assoc_group_reference(struct dcesrv_call_state *call,
 187                                              uint32_t assoc_group_id)
 188 {
 189         struct dcesrv_connection *conn = call->conn;
 190         const struct dcesrv_endpoint *endpoint = conn->endpoint;
 191         enum dcerpc_transport_t transport =
 192                 dcerpc_binding_get_transport(endpoint->ep_description);
 193         struct dcesrv_assoc_group *assoc_group = NULL;
 194         void *id_ptr = NULL;
 195
 196         /* find an association group given a assoc_group_id */
 197         id_ptr = idr_find(conn->dce_ctx->assoc_groups_idr, assoc_group_id);
 198         if (id_ptr == NULL) {
 199                 /*
 200                  * FIXME If the association group is not found it has
 201                  * been created in other process (preforking daemons).
 202                  * Until this is properly fixed we just create a new
 203                  * association group in this process
 204                  */
 205                 DBG_NOTICE("Failed to find assoc_group 0x%08x in this "
 206                            "server process, creating a new one\n",
 207                            assoc_group_id);
 208                 return dcesrv_assoc_group_new(call);
 209         }
 210         assoc_group = talloc_get_type_abort(id_ptr, struct dcesrv_assoc_group);
 211
 212         if (assoc_group->transport != transport) {
 213                 const char *at =
 214                         derpc_transport_string_by_transport(
 215                                 assoc_group->transport);
 216                 const char *ct =
 217                         derpc_transport_string_by_transport(
 218                                 transport);
 219
 220                 DBG_NOTICE("assoc_group 0x%08x (transport %s) "
 221                            "is not available on transport %s\n",
 222                            assoc_group_id, at, ct);
 223                 return NT_STATUS_UNSUCCESSFUL;
 224         }
 225
 226         conn->assoc_group = talloc_reference(conn, assoc_group);
 227         return NT_STATUS_OK;
 228 }
 229
 230 NTSTATUS dcesrv_assoc_group_find(
 231         struct dcesrv_call_state *call,
 232         void *private_data)
 233 {
 234         uint32_t assoc_group_id = call->pkt.u.bind.assoc_group_id;
 235
 236         if (assoc_group_id != 0) {
 237                 return dcesrv_assoc_group_reference(call, assoc_group_id);
 238         }
 239
 240         /* If not requested by client create a new association group */
 241         return dcesrv_assoc_group_new(call);
 242 }
 243
 244 void dcesrv_transport_terminate_connection(struct dcesrv_connection *dce_conn,
 245                                            const char *reason)
 246 {
 247        struct dcerpc_ncacn_conn *ncacn_conn = talloc_get_type_abort(
 248                        dce_conn->transport.private_data,
 249                        struct dcerpc_ncacn_conn);
 250
 251        ncacn_terminate_connection(ncacn_conn, reason);
 252 }
 253
 254 static void ncacn_terminate_connection(struct dcerpc_ncacn_conn *conn,
 255                                        const char *reason)
 256 {
 257        if (reason == NULL) {
 258                reason = "Unknown reason";
 259        }
 260
 261        DBG_NOTICE("Terminating connection - '%s'\n", reason);
 262
 263        talloc_free(conn);
 264 }
 265
 266 NTSTATUS dcesrv_endpoint_by_ncacn_np_name(struct dcesrv_context *dce_ctx,
 267                                           const char *pipe_name,
 268                                           struct dcesrv_endpoint **out)
 269 {
 270         struct dcesrv_endpoint *e = NULL;
 271
 272         for (e = dce_ctx->endpoint_list; e; e = e->next) {
 273                 enum dcerpc_transport_t transport =
 274                         dcerpc_binding_get_transport(e->ep_description);
 275                 const char *endpoint = NULL;
 276
 277                 if (transport != NCACN_NP) {
 278                         continue;
 279                 }
 280
 281                 endpoint = dcerpc_binding_get_string_option(e->ep_description,
 282                                                             "endpoint");
 283                 if (endpoint == NULL) {
 284                         continue;
 285                 }
 286
 287                 if (strncmp(endpoint, "\\pipe\\", 6) == 0) {
 288                         endpoint += 6;
 289                 }
 290
 291                 if (strequal(endpoint, pipe_name)) {
 292                         *out = e;
 293                         return NT_STATUS_OK;
 294                 }
 295         }
 296
 297         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 298 }
 299
 300 struct pipes_struct *dcesrv_get_pipes_struct(struct dcesrv_connection *conn)
 301 {
 302         struct dcerpc_ncacn_conn *ncacn_conn = talloc_get_type_abort(
 303                         conn->transport.private_data,
 304                         struct dcerpc_ncacn_conn);
 305
 306         return &ncacn_conn->p;
 307 }
 308
 309 /* vim: set ts=8 sw=8 noet cindent syntax=c.doxygen: */