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