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                                                          dcerpc_resolve_ctx(s->pipe->conn));
  99                 composite_continue(c, pipe_tcp_req, continue_open_tcp, c);
 100                 return c;
 101
 102         case NCALRPC:
 103         case NCACN_UNIX_STREAM:
 104                 pipe_ncalrpc_req = dcerpc_pipe_open_unix_stream_send(s->pipe2->conn,
 105                                                               dcerpc_unix_socket_path(s->pipe->conn));
 106                 composite_continue(c, pipe_ncalrpc_req, continue_open_pipe, c);
 107                 return c;
 108
 109         default:
 110                 /* looks like a transport we don't support */
 111                 composite_error(c, NT_STATUS_NOT_SUPPORTED);
 112         }
 113
 114         return c;
 115 }
 116
 117
 118 /*
 119   Stage 2 of secondary_connection: Receive result of pipe open request on smb
 120 */
 121 static void continue_open_smb(struct composite_context *ctx)
 122 {
 123         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 124                                                       struct composite_context);
 125
 126         c->status = dcerpc_pipe_open_smb_recv(ctx);
 127         if (!composite_is_ok(c)) return;
 128
 129         continue_pipe_open(c);
 130 }
 131
 132
 133 /*
 134   Stage 2 of secondary_connection: Receive result of pipe open request on tcp/ip
 135 */
 136 static void continue_open_tcp(struct composite_context *ctx)
 137 {
 138         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 139                                                       struct composite_context);
 140
 141         c->status = dcerpc_pipe_open_tcp_recv(ctx);
 142         if (!composite_is_ok(c)) return;
 143
 144         continue_pipe_open(c);
 145 }
 146
 147
 148 /*
 149   Stage 2 of secondary_connection: Receive result of pipe open request on ncalrpc
 150 */
 151 static void continue_open_pipe(struct composite_context *ctx)
 152 {
 153         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 154                                                       struct composite_context);
 155
 156         c->status = dcerpc_pipe_open_pipe_recv(ctx);
 157         if (!composite_is_ok(c)) return;
 158
 159         continue_pipe_open(c);
 160 }
 161
 162
 163 /*
 164   Stage 3 of secondary_connection: Get binding data and flags from primary pipe
 165   and say if we're done ok.
 166 */
 167 static void continue_pipe_open(struct composite_context *c)
 168 {
 169         struct sec_conn_state *s;
 170
 171         s = talloc_get_type(c->private_data, struct sec_conn_state);
 172
 173         s->pipe2->conn->flags = s->pipe->conn->flags;
 174         s->pipe2->binding     = s->binding;
 175         if (!talloc_reference(s->pipe2, s->binding)) {
 176                 composite_error(c, NT_STATUS_NO_MEMORY);
 177                 return;
 178         }
 179
 180         composite_done(c);
 181 }
 182
 183
 184 /*
 185   Receive result of secondary rpc connection request and return
 186   second dcerpc pipe.
 187 */
 188 _PUBLIC_ NTSTATUS dcerpc_secondary_connection_recv(struct composite_context *c,
 189                                           struct dcerpc_pipe **p2)
 190 {
 191         NTSTATUS status = composite_wait(c);
 192         struct sec_conn_state *s;
 193
 194         s = talloc_get_type(c->private_data, struct sec_conn_state);
 195
 196         if (NT_STATUS_IS_OK(status)) {
 197                 *p2 = talloc_steal(s->pipe, s->pipe2);
 198         }
 199
 200         talloc_free(c);
 201         return status;
 202 }
 203
 204 /*
 205   Create a secondary dcerpc connection from a primary connection
 206   - sync version
 207
 208   If the primary is a SMB connection then the secondary connection
 209   will be on the same SMB connection, but using a new fnum
 210 */
 211 _PUBLIC_ NTSTATUS dcerpc_secondary_connection(struct dcerpc_pipe *p,
 212                                      struct dcerpc_pipe **p2,
 213                                      struct dcerpc_binding *b)
 214 {
 215         struct composite_context *c;
 216
 217         c = dcerpc_secondary_connection_send(p, b);
 218         return dcerpc_secondary_connection_recv(c, p2);
 219 }
 220
 221 /*
 222   Create a secondary DCERPC connection, then bind (and possibly
 223   authenticate) using the supplied credentials.
 224
 225   This creates a second connection, to the same host (and on ncacn_np on the same connection) as the first
 226 */
 227 struct sec_auth_conn_state {
 228         struct dcerpc_pipe *pipe2;
 229         struct dcerpc_binding *binding;
 230         const struct ndr_interface_table *table;
 231         struct cli_credentials *credentials;
 232         struct composite_context *ctx;
 233         struct loadparm_context *lp_ctx;
 234 };
 235
 236 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx);
 237 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx);
 238
 239 _PUBLIC_ struct composite_context* dcerpc_secondary_auth_connection_send(struct dcerpc_pipe *p,
 240                                                                 struct dcerpc_binding *binding,
 241                                                                 const struct ndr_interface_table *table,
 242                                                                 struct cli_credentials *credentials,
 243                                                                 struct loadparm_context *lp_ctx)
 244 {
 245
 246         struct composite_context *c, *secondary_conn_ctx;
 247         struct sec_auth_conn_state *s;
 248
 249         /* composite context allocation and setup */
 250         c = composite_create(p, p->conn->event_ctx);
 251         if (c == NULL) return NULL;
 252
 253         s = talloc_zero(c, struct sec_auth_conn_state);
 254         if (composite_nomem(s, c)) return c;
 255         c->private_data = s;
 256         s->ctx = c;
 257
 258         s->binding  = binding;
 259         s->table    = table;
 260         s->credentials = credentials;
 261         s->lp_ctx = lp_ctx;
 262
 263         secondary_conn_ctx = dcerpc_secondary_connection_send(p, binding);
 264
 265         if (composite_nomem(secondary_conn_ctx, s->ctx)) {
 266                 talloc_free(c);
 267                 return NULL;
 268         }
 269
 270         composite_continue(s->ctx, secondary_conn_ctx, dcerpc_secondary_auth_connection_bind,
 271                            s);
 272         return c;
 273 }
 274
 275 /*
 276   Stage 2 of secondary_auth_connection:
 277   Having made the secondary connection, we will need to do an (authenticated) bind
 278 */
 279 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx)
 280 {
 281         struct composite_context *secondary_auth_ctx;
 282         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 283                                                         struct sec_auth_conn_state);
 284
 285         s->ctx->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
 286         if (!composite_is_ok(s->ctx)) return;
 287
 288         secondary_auth_ctx = dcerpc_pipe_auth_send(s->pipe2, s->binding, s->table, s->credentials,
 289                                                    s->lp_ctx);
 290         composite_continue(s->ctx, secondary_auth_ctx, dcerpc_secondary_auth_connection_continue, s);
 291
 292 }
 293
 294 /*
 295   Stage 3 of secondary_auth_connection: Receive result of authenticated bind request
 296 */
 297 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx)
 298 {
 299         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 300                                                         struct sec_auth_conn_state);
 301
 302         s->ctx->status = dcerpc_pipe_auth_recv(ctx, s, &s->pipe2);
 303         if (!composite_is_ok(s->ctx)) return;
 304
 305         composite_done(s->ctx);
 306 }
 307
 308 /*
 309   Receive an authenticated pipe, created as a secondary connection
 310 */
 311 _PUBLIC_ NTSTATUS dcerpc_secondary_auth_connection_recv(struct composite_context *c,
 312                                                TALLOC_CTX *mem_ctx,
 313                                                struct dcerpc_pipe **p)
 314 {
 315         NTSTATUS status = composite_wait(c);
 316         struct sec_auth_conn_state *s;
 317
 318         s = talloc_get_type(c->private_data, struct sec_auth_conn_state);
 319
 320         if (NT_STATUS_IS_OK(status)) {
 321                 *p = talloc_steal(mem_ctx, s->pipe2);
 322         }
 323
 324         talloc_free(c);
 325         return status;
 326 }