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 "auth/credentials/credentials.h"
  31 #include "param/param.h"
  32
  33
  34 struct sec_conn_state {
  35         struct dcerpc_pipe *pipe;
  36         struct dcerpc_pipe *pipe2;
  37         struct dcerpc_binding *binding;
  38         struct smbcli_tree *tree;
  39 };
  40
  41
  42 static void continue_open_smb(struct composite_context *ctx);
  43 static void continue_open_tcp(struct composite_context *ctx);
  44 static void continue_open_pipe(struct composite_context *ctx);
  45 static void continue_pipe_open(struct composite_context *c);
  46
  47
  48 /*
  49   Send request to create a secondary dcerpc connection from a primary
  50   connection
  51 */
  52 struct composite_context* dcerpc_secondary_connection_send(struct dcerpc_pipe *p,
  53                                                            struct dcerpc_binding *b)
  54 {
  55         struct composite_context *c;
  56         struct sec_conn_state *s;
  57         struct composite_context *pipe_smb_req;
  58         struct composite_context *pipe_tcp_req;
  59         struct composite_context *pipe_ncalrpc_req;
  60
  61         /* composite context allocation and setup */
  62         c = composite_create(p, p->conn->event_ctx);
  63         if (c == NULL) return NULL;
  64
  65         s = talloc_zero(c, struct sec_conn_state);
  66         if (composite_nomem(s, c)) return c;
  67         c->private_data = s;
  68
  69         s->pipe     = p;
  70         s->binding  = b;
  71
  72         /* initialise second dcerpc pipe based on primary pipe's event context */
  73         s->pipe2 = dcerpc_pipe_init(c, s->pipe->conn->event_ctx);
  74         if (composite_nomem(s->pipe2, c)) return c;
  75
  76         /* open second dcerpc pipe using the same transport as for primary pipe */
  77         switch (s->pipe->conn->transport.transport) {
  78         case NCACN_NP:
  79                 /* get smb tree of primary dcerpc pipe opened on smb */
  80                 s->tree = dcerpc_smb_tree(s->pipe->conn);
  81                 if (!s->tree) {
  82                         composite_error(c, NT_STATUS_INVALID_PARAMETER);
  83                         return c;
  84                 }
  85
  86                 pipe_smb_req = dcerpc_pipe_open_smb_send(s->pipe2, s->tree,
  87                                                          s->binding->endpoint);
  88                 composite_continue(c, pipe_smb_req, continue_open_smb, c);
  89                 return c;
  90
  91         case NCACN_IP_TCP:
  92                 pipe_tcp_req = dcerpc_pipe_open_tcp_send(s->pipe2->conn,
  93                                                          s->binding->host,
  94                                                          s->binding->target_hostname,
  95                                                          atoi(s->binding->endpoint));
  96                 composite_continue(c, pipe_tcp_req, continue_open_tcp, c);
  97                 return c;
  98
  99         case NCALRPC:
 100                 pipe_ncalrpc_req = dcerpc_pipe_open_pipe_send(s->pipe2->conn, lp_ncalrpc_dir(global_loadparm),
 101                                                               s->binding->endpoint);
 102                 composite_continue(c, pipe_ncalrpc_req, continue_open_pipe, c);
 103                 return c;
 104
 105         default:
 106                 /* looks like a transport we don't support */
 107                 composite_error(c, NT_STATUS_NOT_SUPPORTED);
 108         }
 109
 110         return c;
 111 }
 112
 113
 114 /*
 115   Stage 2 of secondary_connection: Receive result of pipe open request on smb
 116 */
 117 static void continue_open_smb(struct composite_context *ctx)
 118 {
 119         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 120                                                       struct composite_context);
 121
 122         c->status = dcerpc_pipe_open_smb_recv(ctx);
 123         if (!composite_is_ok(c)) return;
 124
 125         continue_pipe_open(c);
 126 }
 127
 128
 129 /*
 130   Stage 2 of secondary_connection: Receive result of pipe open request on tcp/ip
 131 */
 132 static void continue_open_tcp(struct composite_context *ctx)
 133 {
 134         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 135                                                       struct composite_context);
 136
 137         c->status = dcerpc_pipe_open_tcp_recv(ctx);
 138         if (!composite_is_ok(c)) return;
 139
 140         continue_pipe_open(c);
 141 }
 142
 143
 144 /*
 145   Stage 2 of secondary_connection: Receive result of pipe open request on ncalrpc
 146 */
 147 static void continue_open_pipe(struct composite_context *ctx)
 148 {
 149         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 150                                                       struct composite_context);
 151
 152         c->status = dcerpc_pipe_open_pipe_recv(ctx);
 153         if (!composite_is_ok(c)) return;
 154
 155         continue_pipe_open(c);
 156 }
 157
 158
 159 /*
 160   Stage 3 of secondary_connection: Get binding data and flags from primary pipe
 161   and say if we're done ok.
 162 */
 163 static void continue_pipe_open(struct composite_context *c)
 164 {
 165         struct sec_conn_state *s;
 166
 167         s = talloc_get_type(c->private_data, struct sec_conn_state);
 168
 169         s->pipe2->conn->flags = s->pipe->conn->flags;
 170         s->pipe2->binding     = s->binding;
 171         if (!talloc_reference(s->pipe2, s->binding)) {
 172                 composite_error(c, NT_STATUS_NO_MEMORY);
 173                 return;
 174         }
 175
 176         composite_done(c);
 177 }
 178
 179
 180 /*
 181   Receive result of secondary rpc connection request and return
 182   second dcerpc pipe.
 183 */
 184 NTSTATUS dcerpc_secondary_connection_recv(struct composite_context *c,
 185                                           struct dcerpc_pipe **p2)
 186 {
 187         NTSTATUS status = composite_wait(c);
 188         struct sec_conn_state *s;
 189
 190         s = talloc_get_type(c->private_data, struct sec_conn_state);
 191
 192         if (NT_STATUS_IS_OK(status)) {
 193                 *p2 = talloc_steal(s->pipe, s->pipe2);
 194         }
 195
 196         talloc_free(c);
 197         return status;
 198 }
 199
 200 /*
 201   Create a secondary dcerpc connection from a primary connection
 202   - sync version
 203
 204   If the primary is a SMB connection then the secondary connection
 205   will be on the same SMB connection, but using a new fnum
 206 */
 207 NTSTATUS dcerpc_secondary_connection(struct dcerpc_pipe *p,
 208                                      struct dcerpc_pipe **p2,
 209                                      struct dcerpc_binding *b)
 210 {
 211         struct composite_context *c;
 212
 213         c = dcerpc_secondary_connection_send(p, b);
 214         return dcerpc_secondary_connection_recv(c, p2);
 215 }
 216
 217 /*
 218   Create a secondary DCERPC connection, then bind (and possibly
 219   authenticate) using the supplied credentials.
 220
 221   This creates a second connection, to the same host (and on ncacn_np on the same connection) as the first
 222 */
 223 struct sec_auth_conn_state {
 224         struct dcerpc_pipe *pipe2;
 225         struct dcerpc_binding *binding;
 226         const struct ndr_interface_table *table;
 227         struct cli_credentials *credentials;
 228         struct composite_context *ctx;
 229 };
 230
 231 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx);
 232 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx);
 233
 234 struct composite_context* dcerpc_secondary_auth_connection_send(struct dcerpc_pipe *p,
 235                                                                 struct dcerpc_binding *binding,
 236                                                                 const struct ndr_interface_table *table,
 237                                                                 struct cli_credentials *credentials)
 238 {
 239
 240         struct composite_context *c, *secondary_conn_ctx;
 241         struct sec_auth_conn_state *s;
 242
 243         /* composite context allocation and setup */
 244         c = composite_create(p, p->conn->event_ctx);
 245         if (c == NULL) return NULL;
 246
 247         s = talloc_zero(c, struct sec_auth_conn_state);
 248         if (composite_nomem(s, c)) return c;
 249         c->private_data = s;
 250         s->ctx = c;
 251
 252         s->binding  = binding;
 253         s->table    = table;
 254         s->credentials = credentials;
 255
 256         secondary_conn_ctx = dcerpc_secondary_connection_send(p, binding);
 257
 258         if (composite_nomem(secondary_conn_ctx, s->ctx)) {
 259                 talloc_free(c);
 260                 return NULL;
 261         }
 262
 263         composite_continue(s->ctx, secondary_conn_ctx, dcerpc_secondary_auth_connection_bind,
 264                            s);
 265         return c;
 266 }
 267
 268 /*
 269   Stage 2 of secondary_auth_connection:
 270   Having made the secondary connection, we will need to do an (authenticated) bind
 271 */
 272 static void dcerpc_secondary_auth_connection_bind(struct composite_context *ctx)
 273 {
 274         struct composite_context *secondary_auth_ctx;
 275         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 276                                                         struct sec_auth_conn_state);
 277
 278         s->ctx->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
 279         if (!composite_is_ok(s->ctx)) return;
 280
 281         secondary_auth_ctx = dcerpc_pipe_auth_send(s->pipe2, s->binding, s->table, s->credentials);
 282         composite_continue(s->ctx, secondary_auth_ctx, dcerpc_secondary_auth_connection_continue, s);
 283
 284 }
 285
 286 /*
 287   Stage 3 of secondary_auth_connection: Receive result of authenticated bind request
 288 */
 289 static void dcerpc_secondary_auth_connection_continue(struct composite_context *ctx)
 290 {
 291         struct sec_auth_conn_state *s = talloc_get_type(ctx->async.private_data,
 292                                                         struct sec_auth_conn_state);
 293
 294         s->ctx->status = dcerpc_pipe_auth_recv(ctx, s, &s->pipe2);
 295         if (!composite_is_ok(s->ctx)) return;
 296
 297         composite_done(s->ctx);
 298 }
 299
 300 /*
 301   Receive an authenticated pipe, created as a secondary connection
 302 */
 303 NTSTATUS dcerpc_secondary_auth_connection_recv(struct composite_context *c,
 304                                                TALLOC_CTX *mem_ctx,
 305                                                struct dcerpc_pipe **p)
 306 {
 307         NTSTATUS status = composite_wait(c);
 308         struct sec_auth_conn_state *s;
 309
 310         s = talloc_get_type(c->private_data, struct sec_auth_conn_state);
 311
 312         if (NT_STATUS_IS_OK(status)) {
 313                 *p = talloc_steal(mem_ctx, s->pipe2);
 314         }
 315
 316         talloc_free(c);
 317         return status;
 318 }