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
  35
  36 struct sec_conn_state {
  37         struct dcerpc_pipe *pipe;
  38         struct dcerpc_pipe *pipe2;
  39         struct dcerpc_binding *binding;
  40         struct smbcli_tree *tree;
  41 };
  42
  43
  44 static void continue_open_smb(struct composite_context *ctx);
  45 static void continue_open_tcp(struct composite_context *ctx);
  46 static void continue_open_pipe(struct composite_context *ctx);
  47 static void continue_pipe_open(struct composite_context *c);
  48
  49
  50 /*
  51   Send request to create a secondary dcerpc connection from a primary
  52   connection
  53 */
  54 _PUBLIC_ struct composite_context* dcerpc_secondary_connection_send(struct dcerpc_pipe *p,
  55                                                            struct dcerpc_binding *b)
  56 {
  57         struct composite_context *c;
  58         struct sec_conn_state *s;
  59         struct composite_context *pipe_smb_req;
  60         struct composite_context *pipe_tcp_req;
  61         struct composite_context *pipe_ncalrpc_req;
  62
  63         /* composite context allocation and setup */
  64         c = composite_create(p, p->conn->event_ctx);
  65         if (c == NULL) return NULL;
  66
  67         s = talloc_zero(c, struct sec_conn_state);
  68         if (composite_nomem(s, c)) return c;
  69         c->private_data = s;
  70
  71         s->pipe     = p;
  72         s->binding  = b;
  73
  74         /* initialise second dcerpc pipe based on primary pipe's event context */
  75         s->pipe2 = dcerpc_pipe_init(c, s->pipe->conn->event_ctx, s->pipe->conn->iconv_convenience);
  76         if (composite_nomem(s->pipe2, c)) return c;
  77
  78         /* open second dcerpc pipe using the same transport as for primary pipe */
  79         switch (s->pipe->conn->transport.transport) {
  80         case NCACN_NP:
  81                 /* get smb tree of primary dcerpc pipe opened on smb */
  82                 s->tree = dcerpc_smb_tree(s->pipe->conn);
  83                 if (!s->tree) {
  84                         composite_error(c, NT_STATUS_INVALID_PARAMETER);
  85                         return c;
  86                 }
  87
  88                 pipe_smb_req = dcerpc_pipe_open_smb_send(s->pipe2, s->tree,
  89                                                          s->binding->endpoint);
  90                 composite_continue(c, pipe_smb_req, continue_open_smb, c);
  91                 return c;
  92
  93         case NCACN_IP_TCP:
  94                 pipe_tcp_req = dcerpc_pipe_open_tcp_send(s->pipe2->conn,
  95                                                          s->binding->host,
  96                                                          s->binding->target_hostname,
  97                                                          atoi(s->binding->endpoint),
  98                                                          lp_resolve_context(global_loadparm));
  99                 composite_continue(c, pipe_tcp_req, continue_open_tcp, c);
 100                 return c;
 101
 102         case NCALRPC:
 103                 pipe_ncalrpc_req = dcerpc_pipe_open_pipe_send(s->pipe2->conn, lp_ncalrpc_dir(global_loadparm),
 104                                                               s->binding->endpoint);
 105                 composite_continue(c, pipe_ncalrpc_req, continue_open_pipe, c);
 106                 return c;
 107
 108         default:
 109                 /* looks like a transport we don't support */
 110                 composite_error(c, NT_STATUS_NOT_SUPPORTED);
 111         }
 112
 113         return c;
 114 }
 115
 116
 117 /*
 118   Stage 2 of secondary_connection: Receive result of pipe open request on smb
 119 */
 120 static void continue_open_smb(struct composite_context *ctx)
 121 {
 122         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 123                                                       struct composite_context);
 124
 125         c->status = dcerpc_pipe_open_smb_recv(ctx);
 126         if (!composite_is_ok(c)) return;
 127
 128         continue_pipe_open(c);
 129 }
 130
 131
 132 /*
 133   Stage 2 of secondary_connection: Receive result of pipe open request on tcp/ip
 134 */
 135 static void continue_open_tcp(struct composite_context *ctx)
 136 {
 137         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 138                                                       struct composite_context);
 139
 140         c->status = dcerpc_pipe_open_tcp_recv(ctx);
 141         if (!composite_is_ok(c)) return;
 142
 143         continue_pipe_open(c);
 144 }
 145
 146
 147 /*
 148   Stage 2 of secondary_connection: Receive result of pipe open request on ncalrpc
 149 */
 150 static void continue_open_pipe(struct composite_context *ctx)
 151 {
 152         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 153                                                       struct composite_context);
 154
 155         c->status = dcerpc_pipe_open_pipe_recv(ctx);
 156         if (!composite_is_ok(c)) return;
 157
 158         continue_pipe_open(c);
 159 }
 160
 161
 162 /*
 163   Stage 3 of secondary_connection: Get binding data and flags from primary pipe
 164   and say if we're done ok.
 165 */
 166 static void continue_pipe_open(struct composite_context *c)
 167 {
 168         struct sec_conn_state *s;
 169
 170         s = talloc_get_type(c->private_data, struct sec_conn_state);
 171
 172         s->pipe2->conn->flags = s->pipe->conn->flags;
 173         s->pipe2->binding     = s->binding;
 174         if (!talloc_reference(s->pipe2, s->binding)) {
 175                 composite_error(c, NT_STATUS_NO_MEMORY);
 176                 return;
 177         }
 178
 179         composite_done(c);
 180 }
 181
 182
 183 /*
 184   Receive result of secondary rpc connection request and return
 185   second dcerpc pipe.
 186 */
 187 _PUBLIC_ NTSTATUS dcerpc_secondary_connection_recv(struct composite_context *c,
 188                                           struct dcerpc_pipe **p2)
 189 {
 190         NTSTATUS status = composite_wait(c);
 191         struct sec_conn_state *s;
 192
 193         s = talloc_get_type(c->private_data, struct sec_conn_state);
 194
 195         if (NT_STATUS_IS_OK(status)) {
 196                 *p2 = talloc_steal(s->pipe, s->pipe2);
 197         }
 198
 199         talloc_free(c);
 200         return status;
 201 }
 202
 203 /*
 204   Create a secondary dcerpc connection from a primary connection
 205   - sync version
 206
 207   If the primary is a SMB connection then the secondary connection
 208   will be on the same SMB connection, but using a new fnum
 209 */
 210 _PUBLIC_ NTSTATUS dcerpc_secondary_connection(struct dcerpc_pipe *p,
 211                                      struct dcerpc_pipe **p2,
 212                                      struct dcerpc_binding *b)
 213 {
 214         struct composite_context *c;
 215
 216         c = dcerpc_secondary_connection_send(p, b);
 217         return dcerpc_secondary_connection_recv(c, p2);
 218 }
 219
 220 /*
 221   Create a secondary DCERPC connection, then bind (and possibly
 222   authenticate) using the supplied credentials.
 223
 224   This creates a second connection, to the same host (and on ncacn_np on the same connection) as the first
 225 */
 226 struct sec_auth_conn_state {
 227         struct dcerpc_pipe *pipe2;
 228         struct dcerpc_binding *binding;
 229         const struct ndr_interface_table *table;
 230         struct cli_credentials *credentials;
 231         struct composite_context *ctx;
 232         struct loadparm_context *lp_ctx;
 233 };
 234
 235 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx);
 236 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx);
 237
 238 _PUBLIC_ struct composite_context* dcerpc_secondary_auth_connection_send(struct dcerpc_pipe *p,
 239                                                                 struct dcerpc_binding *binding,
 240                                                                 const struct ndr_interface_table *table,
 241                                                                 struct cli_credentials *credentials,
 242                                                                 struct loadparm_context *lp_ctx)
 243 {
 244
 245         struct composite_context *c, *secondary_conn_ctx;
 246         struct sec_auth_conn_state *s;
 247
 248         /* composite context allocation and setup */
 249         c = composite_create(p, p->conn->event_ctx);
 250         if (c == NULL) return NULL;
 251
 252         s = talloc_zero(c, struct sec_auth_conn_state);
 253         if (composite_nomem(s, c)) return c;
 254         c->private_data = s;
 255         s->ctx = c;
 256
 257         s->binding  = binding;
 258         s->table    = table;
 259         s->credentials = credentials;
 260         s->lp_ctx = lp_ctx;
 261
 262         secondary_conn_ctx = dcerpc_secondary_connection_send(p, binding);
 263
 264         if (composite_nomem(secondary_conn_ctx, s->ctx)) {
 265                 talloc_free(c);
 266                 return NULL;
 267         }
 268
 269         composite_continue(s->ctx, secondary_conn_ctx, dcerpc_secondary_auth_connection_bind,
 270                            s);
 271         return c;
 272 }
 273
 274 /*
 275   Stage 2 of secondary_auth_connection:
 276   Having made the secondary connection, we will need to do an (authenticated) bind
 277 */
 278 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx)
 279 {
 280         struct composite_context *secondary_auth_ctx;
 281         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 282                                                         struct sec_auth_conn_state);
 283
 284         s->ctx->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
 285         if (!composite_is_ok(s->ctx)) return;
 286
 287         secondary_auth_ctx = dcerpc_pipe_auth_send(s->pipe2, s->binding, s->table, s->credentials,
 288                                                    s->lp_ctx);
 289         composite_continue(s->ctx, secondary_auth_ctx, dcerpc_secondary_auth_connection_continue, s);
 290
 291 }
 292
 293 /*
 294   Stage 3 of secondary_auth_connection: Receive result of authenticated bind request
 295 */
 296 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx)
 297 {
 298         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 299                                                         struct sec_auth_conn_state);
 300
 301         s->ctx->status = dcerpc_pipe_auth_recv(ctx, s, &s->pipe2);
 302         if (!composite_is_ok(s->ctx)) return;
 303
 304         composite_done(s->ctx);
 305 }
 306
 307 /*
 308   Receive an authenticated pipe, created as a secondary connection
 309 */
 310 _PUBLIC_ NTSTATUS dcerpc_secondary_auth_connection_recv(struct composite_context *c,
 311                                                TALLOC_CTX *mem_ctx,
 312                                                struct dcerpc_pipe **p)
 313 {
 314         NTSTATUS status = composite_wait(c);
 315         struct sec_auth_conn_state *s;
 316
 317         s = talloc_get_type(c->private_data, struct sec_auth_conn_state);
 318
 319         if (NT_STATUS_IS_OK(status)) {
 320                 *p = talloc_steal(mem_ctx, s->pipe2);
 321         }
 322
 323         talloc_free(c);
 324         return status;
 325 }