source4/librpc/rpc/dcerpc_secondary.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc connect functions
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Jelmer Vernooij 2004
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2007
   9    Copyright (C) Rafal Szczesniak  2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25
  26 #include "includes.h"
  27 #include "libcli/composite/composite.h"
  28 #include "lib/events/events.h"
  29 #include "librpc/rpc/dcerpc.h"
  30 #include "librpc/rpc/dcerpc_proto.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "param/param.h"
  33 #include "libcli/resolve/resolve.h"
  34 #include "lib/socket/socket.h"
  35
  36 struct sec_conn_state {
  37         struct dcerpc_pipe *pipe;
  38         struct dcerpc_pipe *pipe2;
  39         struct dcerpc_binding *binding;
  40         struct socket_address *peer_addr;
  41         const char *localaddress;
  42 };
  43
  44
  45 static void continue_open_smb(struct composite_context *ctx);
  46 static void continue_open_tcp(struct composite_context *ctx);
  47 static void continue_open_pipe(struct composite_context *ctx);
  48 static void continue_pipe_open(struct composite_context *c);
  49
  50
  51 /*
  52   Send request to create a secondary dcerpc connection from a primary
  53   connection
  54 */
  55 _PUBLIC_ struct composite_context* dcerpc_secondary_connection_send(struct dcerpc_pipe *p,
  56                                                            struct dcerpc_binding *b)
  57 {
  58         struct composite_context *c;
  59         struct sec_conn_state *s;
  60         struct composite_context *pipe_smb_req;
  61         struct composite_context *pipe_tcp_req;
  62         struct composite_context *pipe_ncalrpc_req;
  63
  64         /* composite context allocation and setup */
  65         c = composite_create(p, p->conn->event_ctx);
  66         if (c == NULL) return NULL;
  67
  68         s = talloc_zero(c, struct sec_conn_state);
  69         if (composite_nomem(s, c)) return c;
  70         c->private_data = s;
  71
  72         s->pipe     = p;
  73         s->binding  = b;
  74
  75         /* initialise second dcerpc pipe based on primary pipe's event context */
  76         s->pipe2 = dcerpc_pipe_init(c, s->pipe->conn->event_ctx);
  77         if (composite_nomem(s->pipe2, c)) return c;
  78
  79         if (DEBUGLEVEL >= 10)
  80                 s->pipe2->conn->packet_log_dir = s->pipe->conn->packet_log_dir;
  81
  82         /* open second dcerpc pipe using the same transport as for primary pipe */
  83         switch (s->pipe->conn->transport.transport) {
  84         case NCACN_NP:
  85                 pipe_smb_req = dcerpc_secondary_smb_send(s->pipe->conn, s->pipe2->conn,
  86                                                          s->binding->endpoint);
  87                 composite_continue(c, pipe_smb_req, continue_open_smb, c);
  88                 return c;
  89
  90         case NCACN_IP_TCP:
  91                 s->peer_addr = dcerpc_socket_peer_addr(s->pipe->conn, s);
  92                 if (!s->peer_addr) {
  93                         composite_error(c, NT_STATUS_INVALID_PARAMETER);
  94                         return c;
  95                 }
  96
  97                 s->localaddress = dcerpc_binding_get_string_option(s->binding,
  98                                                                 "localaddress");
  99
 100                 pipe_tcp_req = dcerpc_pipe_open_tcp_send(s->pipe2->conn,
 101                                                          s->localaddress,
 102                                                          s->peer_addr->addr,
 103                                                          s->binding->target_hostname,
 104                                                          atoi(s->binding->endpoint),
 105                                                          resolve_context_init(s));
 106                 composite_continue(c, pipe_tcp_req, continue_open_tcp, c);
 107                 return c;
 108
 109         case NCALRPC:
 110         case NCACN_UNIX_STREAM:
 111                 pipe_ncalrpc_req = dcerpc_pipe_open_unix_stream_send(s->pipe2->conn,
 112                                                               dcerpc_unix_socket_path(s->pipe->conn));
 113                 composite_continue(c, pipe_ncalrpc_req, continue_open_pipe, c);
 114                 return c;
 115
 116         default:
 117                 /* looks like a transport we don't support */
 118                 composite_error(c, NT_STATUS_NOT_SUPPORTED);
 119         }
 120
 121         return c;
 122 }
 123
 124
 125 /*
 126   Stage 2 of secondary_connection: Receive result of pipe open request on smb
 127 */
 128 static void continue_open_smb(struct composite_context *ctx)
 129 {
 130         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 131                                                       struct composite_context);
 132
 133         c->status = dcerpc_secondary_smb_recv(ctx);
 134         if (!composite_is_ok(c)) return;
 135
 136         continue_pipe_open(c);
 137 }
 138
 139
 140 /*
 141   Stage 2 of secondary_connection: Receive result of pipe open request on tcp/ip
 142 */
 143 static void continue_open_tcp(struct composite_context *ctx)
 144 {
 145         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 146                                                       struct composite_context);
 147
 148         c->status = dcerpc_pipe_open_tcp_recv(ctx);
 149         if (!composite_is_ok(c)) return;
 150
 151         continue_pipe_open(c);
 152 }
 153
 154
 155 /*
 156   Stage 2 of secondary_connection: Receive result of pipe open request on ncalrpc
 157 */
 158 static void continue_open_pipe(struct composite_context *ctx)
 159 {
 160         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 161                                                       struct composite_context);
 162
 163         c->status = dcerpc_pipe_open_unix_stream_recv(ctx);
 164         if (!composite_is_ok(c)) return;
 165
 166         continue_pipe_open(c);
 167 }
 168
 169
 170 /*
 171   Stage 3 of secondary_connection: Get binding data and flags from primary pipe
 172   and say if we're done ok.
 173 */
 174 static void continue_pipe_open(struct composite_context *c)
 175 {
 176         struct sec_conn_state *s;
 177
 178         s = talloc_get_type(c->private_data, struct sec_conn_state);
 179
 180         s->pipe2->conn->flags = s->pipe->conn->flags;
 181         s->pipe2->binding     = dcerpc_binding_dup(s->pipe2, s->binding);
 182         if (composite_nomem(s->pipe2->binding, c)) {
 183                 return;
 184         }
 185
 186         composite_done(c);
 187 }
 188
 189
 190 /*
 191   Receive result of secondary rpc connection request and return
 192   second dcerpc pipe.
 193 */
 194 _PUBLIC_ NTSTATUS dcerpc_secondary_connection_recv(struct composite_context *c,
 195                                           struct dcerpc_pipe **p2)
 196 {
 197         NTSTATUS status = composite_wait(c);
 198         struct sec_conn_state *s;
 199
 200         s = talloc_get_type(c->private_data, struct sec_conn_state);
 201
 202         if (NT_STATUS_IS_OK(status)) {
 203                 *p2 = talloc_steal(s->pipe, s->pipe2);
 204         }
 205
 206         talloc_free(c);
 207         return status;
 208 }
 209
 210 /*
 211   Create a secondary dcerpc connection from a primary connection
 212   - sync version
 213
 214   If the primary is a SMB connection then the secondary connection
 215   will be on the same SMB connection, but using a new fnum
 216 */
 217 _PUBLIC_ NTSTATUS dcerpc_secondary_connection(struct dcerpc_pipe *p,
 218                                      struct dcerpc_pipe **p2,
 219                                      struct dcerpc_binding *b)
 220 {
 221         struct composite_context *c;
 222
 223         c = dcerpc_secondary_connection_send(p, b);
 224         return dcerpc_secondary_connection_recv(c, p2);
 225 }
 226
 227 /*
 228   Create a secondary DCERPC connection, then bind (and possibly
 229   authenticate) using the supplied credentials.
 230
 231   This creates a second connection, to the same host (and on ncacn_np on the same connection) as the first
 232 */
 233 struct sec_auth_conn_state {
 234         struct dcerpc_pipe *pipe2;
 235         struct dcerpc_binding *binding;
 236         const struct ndr_interface_table *table;
 237         struct cli_credentials *credentials;
 238         struct composite_context *ctx;
 239         struct loadparm_context *lp_ctx;
 240 };
 241
 242 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx);
 243 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx);
 244
 245 _PUBLIC_ struct composite_context* dcerpc_secondary_auth_connection_send(struct dcerpc_pipe *p,
 246                                                                 struct dcerpc_binding *binding,
 247                                                                 const struct ndr_interface_table *table,
 248                                                                 struct cli_credentials *credentials,
 249                                                                 struct loadparm_context *lp_ctx)
 250 {
 251
 252         struct composite_context *c, *secondary_conn_ctx;
 253         struct sec_auth_conn_state *s;
 254
 255         /* composite context allocation and setup */
 256         c = composite_create(p, p->conn->event_ctx);
 257         if (c == NULL) return NULL;
 258
 259         s = talloc_zero(c, struct sec_auth_conn_state);
 260         if (composite_nomem(s, c)) return c;
 261         c->private_data = s;
 262         s->ctx = c;
 263
 264         s->binding  = binding;
 265         s->table    = table;
 266         s->credentials = credentials;
 267         s->lp_ctx = lp_ctx;
 268
 269         secondary_conn_ctx = dcerpc_secondary_connection_send(p, binding);
 270
 271         if (composite_nomem(secondary_conn_ctx, s->ctx)) {
 272                 talloc_free(c);
 273                 return NULL;
 274         }
 275
 276         composite_continue(s->ctx, secondary_conn_ctx, dcerpc_secondary_auth_connection_bind,
 277                            s);
 278         return c;
 279 }
 280
 281 /*
 282   Stage 2 of secondary_auth_connection:
 283   Having made the secondary connection, we will need to do an (authenticated) bind
 284 */
 285 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx)
 286 {
 287         struct composite_context *secondary_auth_ctx;
 288         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 289                                                         struct sec_auth_conn_state);
 290
 291         s->ctx->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
 292         if (!composite_is_ok(s->ctx)) return;
 293
 294         secondary_auth_ctx = dcerpc_pipe_auth_send(s->pipe2, s->binding, s->table, s->credentials,
 295                                                    s->lp_ctx);
 296         composite_continue(s->ctx, secondary_auth_ctx, dcerpc_secondary_auth_connection_continue, s);
 297
 298 }
 299
 300 /*
 301   Stage 3 of secondary_auth_connection: Receive result of authenticated bind request
 302 */
 303 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx)
 304 {
 305         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 306                                                         struct sec_auth_conn_state);
 307
 308         s->ctx->status = dcerpc_pipe_auth_recv(ctx, s, &s->pipe2);
 309         if (!composite_is_ok(s->ctx)) return;
 310
 311         composite_done(s->ctx);
 312 }
 313
 314 /*
 315   Receive an authenticated pipe, created as a secondary connection
 316 */
 317 _PUBLIC_ NTSTATUS dcerpc_secondary_auth_connection_recv(struct composite_context *c,
 318                                                TALLOC_CTX *mem_ctx,
 319                                                struct dcerpc_pipe **p)
 320 {
 321         NTSTATUS status = composite_wait(c);
 322         struct sec_auth_conn_state *s;
 323
 324         s = talloc_get_type(c->private_data, struct sec_auth_conn_state);
 325
 326         if (NT_STATUS_IS_OK(status)) {
 327                 *p = talloc_steal(mem_ctx, s->pipe2);
 328         }
 329
 330         talloc_free(c);
 331         return status;
 332 }