src/libcaptive/sandbox/split.c

   1 /* $Id$
   2  * Connection of captive-vfs interface through CORBA/ORBit
   3  * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include "split.h"      /* self */
  23 #include "sandbox.h"
  24 #include "server-GLogFunc.h"
  25 #include "captive/macros.h"
  26 #include <glib/gmacros.h>
  27 #include <stdlib.h>
  28 #include "captive/rtl-file.h"
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <linc/linc.h>  /* for linc_main_get_loop() */
  32 #include "server-Directory.h"
  33 #include "server-Vfs.h"
  34 #include "../client/vfs.h"
  35 #include "captive/parent-Vfs.h"
  36 #include <dirent.h>
  37 #include "server-CaptiveIOChannel.h"
  38 #include <errno.h>
  39
  40
  41 /* CONFIG: */
  42
  43 #define HEARTBEAT_SOURCE_CHECK_EVENTS (G_IO_IN|G_IO_PRI)
  44 #define HEARTBEAT_SOURCE_CHECK_REVENTS (HEARTBEAT_SOURCE_CHECK_EVENTS|G_IO_ERR|G_IO_HUP|G_IO_NVAL)
  45
  46
  47 gboolean validate_CORBA_Environment(CORBA_Environment *evp)
  48 {
  49         if (evp->_major==CORBA_NO_EXCEPTION)
  50                 return TRUE;
  51
  52         g_message(_("CORBA Exception occured: id=\"%s\", value=%p"),
  53                         CORBA_exception_id(evp),CORBA_exception_value(evp));
  54         return FALSE;
  55 }
  56
  57 CORBA_Environment captive_corba_ev;
  58 CORBA_ORB captive_corba_orb;
  59 PortableServer_POA captive_corba_poa;
  60
  61 static void corba_shutdown_atexit(void);
  62
  63 static gboolean corba_init(const char *pname,CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
  64 {
  65 static gboolean done=FALSE;
  66 int orb_argc=1;
  67 gchar *orb_argv[]={
  68                 (gchar *)captive_strdup_alloca(pname),
  69                 NULL};
  70
  71         g_return_val_if_fail(evp!=NULL,FALSE);
  72         g_return_val_if_fail(orbp!=NULL,FALSE);
  73         g_return_val_if_fail(poap!=NULL,FALSE);
  74
  75         if (done)
  76                 return TRUE;
  77
  78         /* Init 'ev' */
  79         CORBA_exception_init(evp);
  80
  81         /* Init 'orb' */
  82         *orbp=CORBA_ORB_init(&orb_argc,orb_argv,"orbit-local-orb",evp);
  83         g_return_val_if_fail(*orbp!=CORBA_OBJECT_NIL,FALSE);
  84         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  85
  86         /* Init 'poa' */
  87         *poap=(PortableServer_POA)CORBA_ORB_resolve_initial_references(*orbp,"RootPOA",evp);
  88         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  89         {
  90 PortableServer_POAManager poa_mgr;
  91                 poa_mgr=PortableServer_POA__get_the_POAManager(*poap,evp);
  92                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  93                 PortableServer_POAManager_activate(poa_mgr,evp);
  94                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  95                 CORBA_Object_release((CORBA_Object)poa_mgr,evp);
  96                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  97                 }
  98
  99         g_atexit(corba_shutdown_atexit);
 100
 101         done=TRUE;
 102         return TRUE;
 103 }
 104
 105
 106 static CORBA_ORB heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 107
 108 gboolean corba_shutdown(CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
 109 {
 110 PortableServer_POA poa;
 111 CORBA_ORB orb;
 112
 113         g_return_val_if_fail(evp!=NULL,FALSE);
 114         g_return_val_if_fail(orbp!=NULL,FALSE);
 115         g_return_val_if_fail(poap!=NULL,FALSE);
 116
 117         /* Shutdown 'poa' */
 118         poa=*poap;
 119         *poap=CORBA_OBJECT_NIL;
 120         CORBA_Object_release((CORBA_Object)poa,evp);
 121         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 122
 123         /* Shutdown 'orb' */
 124         orb=*orbp;
 125         *orbp=CORBA_OBJECT_NIL;
 126         heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 127         CORBA_ORB_destroy(orb,evp);
 128         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 129
 130         /* Shutdown 'ev' */
 131         CORBA_exception_free(evp);
 132
 133         return TRUE;
 134 }
 135
 136 static void corba_shutdown_atexit(void)
 137 {
 138 gboolean errbool;
 139
 140         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 141         g_assert(errbool==TRUE);
 142 }
 143
 144
 145 static GSource *captive_corba_sandbox_child_heartbeat_gsource;
 146
 147 void sandbox_child_prepare_shutdown(void)
 148 {
 149         /* Prevent during shutdown: Captive-WARNING **: CORBA Exception occured: id="IDL:omg.org/CORBA/COMM_FAILURE:1.0" */
 150         if (captive_corba_sandbox_child_heartbeat_gsource) {
 151                 g_source_destroy(captive_corba_sandbox_child_heartbeat_gsource);
 152                 g_source_unref(captive_corba_sandbox_child_heartbeat_gsource);
 153                 captive_corba_sandbox_child_heartbeat_gsource=NULL;
 154                 }
 155 }
 156
 157
 158 void sandbox_child_shutdown(void)
 159 {
 160         /* Do not fail by passing logging messages to the master. */
 161         impl_Captive_Vfs_init_g_log_func_disable();
 162
 163         g_main_loop_quit(linc_main_get_loop());
 164 }
 165
 166
 167 static gboolean heartbeat_source_callback(gpointer data /* unused */)
 168 {
 169         g_return_val_if_fail(heartbeat_source_callback_orb!=CORBA_OBJECT_NIL,FALSE);    /* the source should be removed */
 170
 171         sandbox_child_shutdown();
 172
 173         return FALSE;   /* the source should be removed */
 174 }
 175
 176
 177 static gboolean heartbeat_source_prepare(GSource *source,gint *timeout)
 178 {
 179         *timeout=-1;
 180
 181         return FALSE;
 182 }
 183
 184 static GPollFD heartbeat_source_check_gpollfd;
 185
 186 static gboolean heartbeat_source_check(GSource *source)
 187 {
 188         return !!(heartbeat_source_check_gpollfd.revents & HEARTBEAT_SOURCE_CHECK_REVENTS);
 189 }
 190
 191 static gboolean heartbeat_source_dispatch(GSource *source,GSourceFunc callback,gpointer user_data)
 192 {
 193         g_assert(callback!=NULL);
 194         return (*callback)(user_data);
 195 }
 196
 197 static GSourceFuncs heartbeat_source_watch_funcs={
 198                 heartbeat_source_prepare,
 199                 heartbeat_source_check,
 200                 heartbeat_source_dispatch,
 201                 NULL,   /* finalize */
 202                 };
 203
 204 void captive_corba_sandbox_child(const gchar *chrooted_orbit_dir)
 205 {
 206 Captive_Vfs Vfs_object;
 207 impl_POA_Captive_Vfs *Vfs_servant;
 208 gboolean errbool;
 209 guint errguint;
 210 GSource *gsource;
 211 int errint;
 212
 213         /* attach heartbeat_source_callback() to watch for any abnormalities
 214          * on our open pipe 'parentheart_fds' and terminate the child if parent dies.
 215          */
 216         gsource=g_source_new(&heartbeat_source_watch_funcs,sizeof(GSource));
 217         g_return_if_fail(gsource!=NULL);
 218         g_source_set_callback(
 219                         gsource,        /* source */
 220                         heartbeat_source_callback,      /* func */
 221                         NULL,   /* data */
 222                         NULL);  /* notify */
 223         heartbeat_source_check_gpollfd.fd=0 /* STDIN */;        /* parentheart_fd_read */
 224         heartbeat_source_check_gpollfd.events=HEARTBEAT_SOURCE_CHECK_EVENTS;
 225         heartbeat_source_check_gpollfd.revents=0;
 226         g_source_add_poll(gsource,&heartbeat_source_check_gpollfd);
 227
 228         errbool=corba_init("captive-sandbox-child",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 229         g_return_if_fail(errbool==TRUE);
 230
 231         heartbeat_source_callback_orb=captive_corba_orb;
 232
 233         /* linc_main_get_loop() makes sense only after corba_init() -> CORBA_ORB_init() */
 234         errguint=g_source_attach(
 235                         gsource,        /* source */
 236                         g_main_loop_get_context(linc_main_get_loop())); /* context; NULL means 'default context' */
 237         g_assert(errguint!=0);
 238
 239         /* Init 'Vfs_object' */
 240         Vfs_object=impl_Captive_Vfs__create(captive_corba_poa,&captive_corba_ev);
 241         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 242
 243         /* Pass IOR to our parent.
 244          * It will also create the socket needed for 'chrooted_orbit_dir' below
 245          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 246          */
 247         {
 248 char *Vfs_IOR;
 249                 Vfs_IOR=CORBA_ORB_object_to_string(captive_corba_orb,Vfs_object,&captive_corba_ev);
 250                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 251                 g_assert(Vfs_IOR!=NULL);
 252                 errint=printf("ior=%s\n",Vfs_IOR);
 253                 g_assert(errint>=0);
 254                 CORBA_free(Vfs_IOR);
 255                 }
 256
 257         /* Default mode is 0700, permit parent non-"captive" users to access our IOR socket. */
 258         if (chrooted_orbit_dir) {
 259 DIR *dir;
 260 struct dirent *dirent;
 261 const gchar *socketname=NULL,*socketpathname;
 262
 263                 errint=chmod(chrooted_orbit_dir,0755);
 264                 g_assert(errint==0);
 265
 266                 dir=opendir(chrooted_orbit_dir);
 267                 g_assert(dir!=NULL);
 268                 while (errno=0,(dirent=readdir(dir))) {
 269                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 270                                 continue;
 271                         g_assert(socketname==NULL);
 272                         socketname=captive_strdup_alloca(dirent->d_name);
 273                         }
 274                 g_assert(errno==0);
 275                 errint=closedir(dir);
 276                 g_assert(errint==0);
 277                 g_assert(socketname!=NULL);
 278
 279                 socketpathname=captive_printf_alloca("%s/%s",chrooted_orbit_dir,socketname);
 280                 errint=chmod(socketpathname,0666);
 281                 g_assert(errint==0);
 282
 283                 printf("socketname=%s\n",socketname);
 284                 }
 285
 286         /* Close the output to flush it to our spawning parent. */
 287         errint=fflush(stdout);
 288         g_assert(errint==0);
 289         errint=fclose(stdout);
 290         g_assert(errint==0);
 291
 292         /* CORBA_ORB_run() -> linc_main_loop_run() -> g_main_loop_run()
 293          * and therefore we should be safe with glib events handling.
 294          */
 295         CORBA_ORB_run(captive_corba_orb,&captive_corba_ev);
 296         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 297
 298         /* Shutdown 'Vfs' servant */
 299         Vfs_servant=PortableServer_POA_reference_to_servant(captive_corba_poa,Vfs_object,&captive_corba_ev);
 300         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 301         CORBA_Object_release(Vfs_object,&captive_corba_ev);
 302         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 303         impl_Captive_Vfs__destroy(Vfs_servant,&captive_corba_ev);
 304         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 305
 306         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 307         g_assert(errbool==TRUE);
 308
 309         _exit(EXIT_SUCCESS);
 310 }
 311
 312
 313 static void options_module_captive_to_options_module_corba
 314                 (Captive_CaptiveOptionsModule *dest_options_module_corba,const struct captive_options_module *src_options_module_captive)
 315 {
 316         g_return_if_fail(dest_options_module_corba!=NULL);
 317         g_return_if_fail(src_options_module_captive!=NULL);
 318
 319         g_return_if_fail(src_options_module_captive->type==CAPTIVE_OPTIONS_MODULE_TYPE_PE32);
 320
 321         dest_options_module_corba->pathname_utf8=g_strdup(src_options_module_captive->pathname_utf8);
 322         dest_options_module_corba->data._buffer=g_memdup(src_options_module_captive->u.pe32.base,
 323                         src_options_module_captive->u.pe32.length);
 324         dest_options_module_corba->data._maximum=src_options_module_captive->u.pe32.length;
 325         dest_options_module_corba->data._length =src_options_module_captive->u.pe32.length;
 326         dest_options_module_corba->data._release=TRUE;
 327 }
 328
 329
 330 static const gchar *sandbox_parent_own_orbit_dir;
 331 static const gchar *sandbox_parent_own_orbit_socket;
 332
 333 gchar *sandbox_parent_read_ior(int Vfs_IOR_fd_read,gchar **child_chroot_pid_hashkey_dirp)
 334 {
 335 gchar *data;
 336 gsize data_size;
 337 GHashTable *hash;
 338 gchar *ior,*child_chroot_pid_hashkey_dir;
 339 int errint;
 340 gchar *s,*sd,*se;
 341 gboolean errbool;
 342
 343         /* Initialize /tmp/orbit-$username directory for linking IOR socket. */
 344         errbool=corba_init("captive-sandbox-parent",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 345         g_assert(errbool==TRUE);
 346
 347         /* FIXME: Security: Duplicate giop_tmpdir_init() here. */
 348         if (!sandbox_parent_own_orbit_dir) {
 349                 sandbox_parent_own_orbit_dir=g_strdup_printf("/tmp/captive-orbit-%d",getpid());
 350                 if (mkdir(sandbox_parent_own_orbit_dir,0700)) {
 351 DIR *dir;
 352 struct dirent *dirent;
 353                         g_assert(errno==EEXIST);
 354
 355                         dir=opendir(sandbox_parent_own_orbit_dir);
 356                         g_assert(dir!=NULL);
 357
 358                         while (errno=0,(dirent=readdir(dir))) {
 359 gchar *pathname;
 360                                 if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 361                                         continue;
 362                                 pathname=g_strdup_printf("%s/%s",sandbox_parent_own_orbit_dir,dirent->d_name);
 363                                 errint=unlink(pathname);
 364                                 g_assert(errint==0);
 365                                 g_free(pathname);
 366                                 }
 367                         g_assert(errno==0);
 368                         errint=closedir(dir);
 369                         g_assert(errint==0);
 370                         }
 371                 linc_set_tmpdir(sandbox_parent_own_orbit_dir);
 372                 }
 373
 374         data=captive_rtl_file_read(Vfs_IOR_fd_read,&data_size); /* data_fd_read */
 375         errint=close(Vfs_IOR_fd_read);
 376         g_assert(errint==0);
 377         g_assert(data!=NULL);
 378         g_assert(data_size>=1);
 379         g_assert(data[data_size-1]=='\n');
 380
 381         hash=g_hash_table_new(g_str_hash,g_str_equal);
 382
 383         for (s=data;s<data+data_size;s=se+1) {
 384                 se=strchr(s,'\n');
 385                 g_assert(se!=NULL);
 386                 *se=0;
 387                 sd=strchr(s,'=');
 388                 g_assert(sd!=NULL);
 389                 *sd=0;
 390                 g_hash_table_insert(hash,s,sd+1);
 391                 }
 392         g_assert(s==data+data_size);
 393
 394         if ((child_chroot_pid_hashkey_dir=g_hash_table_lookup(hash,"chroot_pid_hashkey_dir"))) {
 395 const gchar *socketname,*socketpathname_src,*socketpathname_dest;
 396 const gchar *chrooted_orbit_dir;
 397
 398                 /* IOR contains the full pathname with the setuid username encoded. */
 399                 chrooted_orbit_dir=g_hash_table_lookup(hash,"chrooted_orbit_dir");
 400                 g_assert(chrooted_orbit_dir!=NULL);
 401                 if (mkdir(chrooted_orbit_dir,S_ISVTX|0777)) {
 402                         g_assert(errno==EEXIST);
 403                         }
 404
 405                 socketname=g_hash_table_lookup(hash,"socketname");
 406                 g_assert(socketname!=NULL);
 407
 408                 socketpathname_src=captive_printf_alloca("%s/%s/%s",child_chroot_pid_hashkey_dir,chrooted_orbit_dir,socketname);
 409                 socketpathname_dest=captive_printf_alloca("%s/%s",chrooted_orbit_dir,socketname);
 410                 errint=link(socketpathname_src,socketpathname_dest);
 411                 g_assert(errint==0);
 412                 }
 413         if (child_chroot_pid_hashkey_dirp)
 414                 *child_chroot_pid_hashkey_dirp=g_strdup(child_chroot_pid_hashkey_dir);
 415
 416         ior=g_hash_table_lookup(hash,"ior");
 417         g_assert(ior!=NULL);
 418         ior=g_strdup(ior);
 419         g_free(data);
 420
 421         g_hash_table_destroy(hash);
 422
 423         return ior;
 424 }
 425
 426
 427 static void sandbox_parent(const gchar *Vfs_IOR,const gchar *child_chroot_pid_hashkey_dir,
 428                 struct captive_options *options_captive,Captive_Vfs *corba_Vfs_object_return,
 429                 Captive_GLogFunc *corba_GLogFunc_object_return,Captive_CaptiveIOChannel *corba_CaptiveIOChannel_object_return)
 430 {
 431 Captive_Vfs Vfs_object;
 432 Captive_GLogFunc GLogFunc_object;
 433 Captive_CaptiveIOChannel CaptiveIOChannel_object;
 434 Captive_CaptiveOptions options_corba;
 435 guint load_module_length,load_moduleui;
 436 struct captive_options_module *options_module;
 437 GList *load_module_node;
 438 const gchar *child_chroot_parent_own_orbit_socket,*child_chroot_parent_own_orbit_dir;
 439 int errint;
 440
 441         g_return_if_fail(Vfs_IOR!=NULL);
 442         g_return_if_fail(corba_Vfs_object_return!=NULL);
 443         g_return_if_fail(corba_GLogFunc_object_return!=NULL);
 444
 445         Vfs_object=CORBA_ORB_string_to_object(captive_corba_orb,Vfs_IOR,&captive_corba_ev);
 446         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 447
 448         /* Init 'GLogFunc_object' */
 449         GLogFunc_object=impl_Captive_GLogFunc__create(captive_corba_poa,&captive_corba_ev);
 450         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 451
 452         /* Init 'CaptiveIOChannel_object' */
 453         CaptiveIOChannel_object=impl_Captive_CaptiveIOChannel__create(captive_corba_poa,
 454                         options_captive->image_iochannel,&captive_corba_ev);
 455         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 456
 457         /* Create the socket needed for 'sandbox_parent_own_orbit_socket' below
 458          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 459          */
 460         {
 461 char *GLogFunc_IOR;
 462                 GLogFunc_IOR=CORBA_ORB_object_to_string(captive_corba_orb,GLogFunc_object,&captive_corba_ev);
 463                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 464                 g_assert(GLogFunc_IOR!=NULL);
 465                 CORBA_free(GLogFunc_IOR);
 466                 }
 467
 468         if (!sandbox_parent_own_orbit_socket) {
 469 DIR *dir;
 470 struct dirent *dirent;
 471
 472                 g_assert(sandbox_parent_own_orbit_dir!=NULL);
 473
 474                 dir=opendir(sandbox_parent_own_orbit_dir);
 475                 g_assert(dir!=NULL);
 476
 477                 while (errno=0,(dirent=readdir(dir))) {
 478                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 479                                 continue;
 480                         g_assert(sandbox_parent_own_orbit_socket==NULL);
 481                         sandbox_parent_own_orbit_socket=g_strdup_printf("%s/%s",sandbox_parent_own_orbit_dir,dirent->d_name);
 482                         }
 483                 g_assert(errno==0);
 484                 errint=closedir(dir);
 485                 g_assert(errint==0);
 486                 g_assert(sandbox_parent_own_orbit_socket!=NULL);
 487                 }
 488
 489         child_chroot_parent_own_orbit_dir=captive_printf_alloca("%s/%s",child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_dir);
 490         errint=mkdir(child_chroot_parent_own_orbit_dir,0777);
 491         g_assert(errint==0);
 492         child_chroot_parent_own_orbit_socket=captive_printf_alloca("%s/%s",
 493                         child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_socket);
 494         errint=link(sandbox_parent_own_orbit_socket,child_chroot_parent_own_orbit_socket);
 495         g_assert(errint==0);
 496         /* chmod(2)s also our orig. one (!) but this one is protected by its 0777 directory. */
 497         errint=chmod(child_chroot_parent_own_orbit_socket,0666);
 498         g_assert(errint==0);
 499
 500         options_corba.g_log_func=GLogFunc_object;
 501         options_module_captive_to_options_module_corba(&options_corba.filesystem,&options_captive->filesystem);
 502         options_corba.rwmode        =options_captive->rwmode;
 503         options_corba.media         =options_captive->media;
 504         options_corba.debug_messages=options_captive->debug_messages;
 505         options_corba.image_iochannel=CaptiveIOChannel_object;
 506
 507         load_module_length=g_list_length(options_captive->load_module);
 508         captive_newn(options_corba.load_module._buffer,load_module_length);
 509         options_corba.load_module._maximum=load_module_length;
 510         options_corba.load_module._length=load_module_length;
 511         options_corba.load_module._release=TRUE;
 512         for (load_moduleui=0,load_module_node=options_captive->load_module;
 513                         load_module_node;
 514                         load_moduleui++,load_module_node=load_module_node->next) {
 515                 options_module=load_module_node->data;
 516                 options_module_captive_to_options_module_corba(options_corba.load_module._buffer+load_moduleui,options_module);
 517                 }
 518
 519         Captive_Vfs_init(Vfs_object,&options_corba,&captive_corba_ev);
 520         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 521
 522         /* FIXME: Free 'options_corba' - LEAK */
 523
 524         *corba_Vfs_object_return=Vfs_object;
 525         *corba_GLogFunc_object_return=GLogFunc_object;
 526         *corba_CaptiveIOChannel_object_return=CaptiveIOChannel_object;
 527 }
 528
 529 static void fd_shiftup(int *fdp)
 530 {
 531         g_return_if_fail(fdp!=NULL);
 532
 533         while (*fdp<=2 /* STDERR */) {
 534                 *fdp=dup(*fdp);
 535                 g_assert(*fdp!=-1);
 536                 }
 537 }
 538
 539 void captive_sandbox_fd_closeup(int fd_first_to_delete)
 540 {
 541 DIR *dir;
 542 int errint;
 543 int dir_fd;
 544 struct dirent *dirent;
 545
 546         dir=opendir("/proc/self/fd/");
 547         g_return_if_fail(dir!=NULL);
 548         dir_fd=dirfd(dir);
 549         g_return_if_fail(dir_fd!=-1);
 550
 551         while (errno=0,(dirent=readdir(dir))) {
 552 long dirent_fd;
 553 char *endptr;
 554
 555                 if (0
 556                                 || !strcmp(dirent->d_name,".")
 557                                 || !strcmp(dirent->d_name,".."))
 558                         continue;
 559                 dirent_fd=strtol(dirent->d_name,&endptr,10 /* base */);
 560                 g_assert(dirent_fd>=0 && (!endptr || !*endptr));
 561                 if (dirent_fd<fd_first_to_delete || dirent_fd==dir_fd)
 562                         continue;
 563
 564                 errint=close(dirent_fd);
 565                 g_assert(errint==0);
 566                 errno=0;
 567                 errint=close(dirent_fd);
 568                 g_assert(errint==-1); g_assert(errno==EBADF);
 569                 }
 570         g_return_if_fail(errno==0);     /* check for EOF */
 571
 572         errint=closedir(dir);
 573         g_return_if_fail(errint==0);
 574         errno=0;
 575         close(dir_fd); g_assert(errno==EBADF);  /* just a bit of paranoia; it should be already closed by closedir() */
 576 }
 577
 578 gboolean captive_sandbox_spawn(CaptiveVfsObject *child_captive_vfs_object,
 579                 Captive_Vfs *corba_Vfs_object_return,Captive_GLogFunc *corba_GLogFunc_object_return,
 580                 Captive_CaptiveIOChannel *corba_CaptiveIOChannel_object_return,int *parentheart_fds_1_return)
 581 {
 582 /* Vfs_IOR_fds[0] for reading by sandbox_parent() - client,
 583  * Vfs_IOR_fds[1] for writing by sandbox_child()  - server
 584  */
 585 int Vfs_IOR_fds[2],parentheart_fds[2];
 586 int errint;
 587
 588         g_return_val_if_fail(child_captive_vfs_object!=NULL,FALSE);
 589         g_return_val_if_fail(corba_Vfs_object_return!=NULL,FALSE);
 590         g_return_val_if_fail(corba_GLogFunc_object_return!=NULL,FALSE);
 591         g_return_val_if_fail(parentheart_fds_1_return!=NULL,FALSE);
 592
 593         errint=pipe(Vfs_IOR_fds);
 594         g_return_val_if_fail(errint==0,FALSE);
 595         errint=pipe(parentheart_fds);
 596         g_return_val_if_fail(errint==0,FALSE);
 597
 598         /* Currently never called anywhere:
 599          *     errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 600          *     g_assert(errbool==TRUE);
 601          */
 602
 603         if (child_captive_vfs_object->options.sandbox_server_ior) {
 604                 g_assert(child_captive_vfs_object->options.sandbox_server_argv==NULL);
 605                 *parentheart_fds_1_return=-1;
 606                 sandbox_parent(
 607                                 child_captive_vfs_object->options.sandbox_server_ior,   /* Vfs_IOR */
 608                                 NULL,   /* child_chroot_pid_hashkey_dir */
 609                                 &child_captive_vfs_object->options,     /* options_captive */
 610                                 corba_Vfs_object_return,        /* corba_Vfs_object_return */
 611                                 corba_GLogFunc_object_return,   /* corba_GLogFunc_object_return */
 612                                 corba_CaptiveIOChannel_object_return);  /* corba_CaptiveIOChannel_object_return */
 613                 return TRUE;
 614                 }
 615
 616         g_assert(child_captive_vfs_object->options.sandbox_server_argv!=NULL);
 617         switch (fork()) {
 618                 case -1:        /* error */
 619                         g_return_val_if_reached(FALSE);
 620
 621                 case 0: { /* child */
 622
 623                         errint=close(Vfs_IOR_fds[0]);   /* close Vfs_IOR_fd_read */
 624                         g_return_val_if_fail(errint==0,FALSE);
 625                         errint=close(parentheart_fds[1]);       /* close parentheart_fd_write */
 626                         g_return_val_if_fail(errint==0,FALSE);
 627
 628                         fd_shiftup(Vfs_IOR_fds+1);      /* Vfs_IOR_fd_write */
 629                         fd_shiftup(parentheart_fds+0);  /* parentheart_fd_read */
 630                         errint=dup2(Vfs_IOR_fds[1],1 /* STDOUT */);     /* Vfs_IOR_fd_write */
 631                         g_return_val_if_fail(errint==1 /* STDOUT */,FALSE);
 632                         errint=dup2(parentheart_fds[0],0 /* STDIN */);  /* parentheart_fd_read */
 633                         g_return_val_if_fail(errint==0 /* STDIN */,FALSE);
 634
 635                         captive_sandbox_fd_closeup(2 /* STDERR */ +1);
 636
 637                         execv(child_captive_vfs_object->options.sandbox_server_argv[0],
 638                                         /* re-const */ (char * const *)child_captive_vfs_object->options.sandbox_server_argv);
 639                         g_return_val_if_reached(FALSE);
 640                         } /* NOTREACHED */
 641
 642                 default: {      /* parent */
 643 gchar *Vfs_IOR;
 644 gchar *child_chroot_pid_hashkey_dir;
 645
 646                         errint=close(Vfs_IOR_fds[1]);   /* close Vfs_IOR_fd_write */
 647                         g_return_val_if_fail(errint==0,FALSE);
 648                         errint=close(parentheart_fds[0]);       /* close parentheart_fd_read */
 649                         g_return_val_if_fail(errint==0,FALSE);
 650                         errint=fcntl(parentheart_fds[1],F_SETFD,FD_CLOEXEC);
 651                         /* This fcntl(2) may not be enough - some fork(2) may duplicate this
 652                          * write descriptor and even if we do some process finish the child
 653                          * may remain alone connected with some unknown fork(2)er from us.
 654                          * Currently I am not aware such case would occur.
 655                          */
 656                         g_return_val_if_fail(errint==0,FALSE);
 657                         *parentheart_fds_1_return=parentheart_fds[1];
 658
 659                         Vfs_IOR=sandbox_parent_read_ior(
 660                                         Vfs_IOR_fds[0], /* Vfs_IOR_fd_read */
 661                                         &child_chroot_pid_hashkey_dir);
 662
 663                         sandbox_parent(
 664                                         Vfs_IOR,        /* Vfs_IOR */
 665                                         child_chroot_pid_hashkey_dir,   /* child_chroot_pid_hashkey_dir */
 666                                         &child_captive_vfs_object->options,     /* options_captive */
 667                                         corba_Vfs_object_return,        /* corba_Vfs_object_return */
 668                                         corba_GLogFunc_object_return,   /* corba_GLogFunc_object_return */
 669                                         corba_CaptiveIOChannel_object_return);  /* corba_CaptiveIOChannel_object_return */
 670
 671                         g_free(Vfs_IOR);
 672                         g_free(child_chroot_pid_hashkey_dir);
 673
 674                         /* 'parentheart_fds[1]' - parentheart_fd_write - is left open here */
 675                         return TRUE;
 676                         }
 677                 }
 678         /* NOTREACHED */
 679         g_return_val_if_reached(FALSE);
 680 }
 681
 682
 683 GnomeVFSResult captive_sandbox_parent_return_from_CORBA_Environment(CORBA_Environment *evp)
 684 {
 685 GnomeVFSResult r;
 686
 687         if (evp->_major==CORBA_NO_EXCEPTION)
 688                 return GNOME_VFS_OK;
 689
 690         if (evp->_major==CORBA_USER_EXCEPTION && !strcmp(ex_Captive_GnomeVFSResultException,CORBA_exception_id(evp)))
 691                 r=((Captive_GnomeVFSResultException *)CORBA_exception_value(evp))->gnome_vfs_result;
 692         else {
 693                 r=GNOME_VFS_ERROR_GENERIC;
 694                 g_warning(_("CORBA Exception occured: id=\"%s\", value=%p"),
 695                                 CORBA_exception_id(evp),CORBA_exception_value(evp));
 696                 }
 697         CORBA_exception_free(evp);
 698
 699         return r;
 700 }
 701
 702
 703 gboolean captive_sandbox_parent_query_vfs_retry(CORBA_Environment *evp,CaptiveVfsObject *captive_vfs_object)
 704 {
 705 GnomeVFSResult errvfsresult;
 706
 707         g_return_val_if_fail(evp!=NULL,FALSE);
 708         g_return_val_if_fail(captive_vfs_object!=NULL,FALSE);
 709
 710         /* If !child_captive_vfs_object->options.sandbox_server_argv it is child_captive_vfs_object->options.sandbox_server_ior
 711          * where we cannot do any restart anyway.
 712          */
 713         if (!captive_vfs_object->options.sandbox_server_argv
 714                         || !(evp->_major==CORBA_SYSTEM_EXCEPTION && !strcmp(ex_CORBA_COMM_FAILURE,CORBA_exception_id(evp))))
 715                 return FALSE;   /* no retry */
 716         CORBA_exception_free(evp);
 717
 718         captive_sandbox_parent_vfs_close(captive_vfs_object);   /* errors ignored */
 719         errvfsresult=captive_sandbox_parent_vfs_new(captive_vfs_object);
 720
 721         return errvfsresult==GNOME_VFS_OK;      /* retry if restart succeeded */
 722 }
 723
 724
 725 void captive_sandbox_child_GnomeVFSResultException_throw(CORBA_Environment *evp,GnomeVFSResult errvfsresult)
 726 {
 727 Captive_GnomeVFSResultException *gnome_vfs_result_exception;
 728
 729         g_return_if_fail(evp!=NULL);
 730
 731         gnome_vfs_result_exception=Captive_GnomeVFSResultException__alloc();
 732         gnome_vfs_result_exception->gnome_vfs_result=errvfsresult;
 733         CORBA_exception_set(evp,CORBA_USER_EXCEPTION,ex_Captive_GnomeVFSResultException,gnome_vfs_result_exception);
 734 }