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 "parent-Vfs.h"
  36 #include <dirent.h>
  37 #include "server-CaptiveIOChannel.h"
  38 #include <errno.h>
  39 #include "../client/giochannel-blind.h" /* for captive_giochannel_blind_new() */
  40 #include <signal.h>
  41
  42
  43 /* CONFIG: */
  44
  45 #define HEARTBEAT_SOURCE_CHECK_EVENTS (G_IO_IN|G_IO_PRI)
  46 #define HEARTBEAT_SOURCE_CHECK_REVENTS (HEARTBEAT_SOURCE_CHECK_EVENTS|G_IO_ERR|G_IO_HUP|G_IO_NVAL)
  47
  48
  49 gboolean validate_CORBA_Environment(CORBA_Environment *evp)
  50 {
  51         if (evp->_major==CORBA_NO_EXCEPTION)
  52                 return TRUE;
  53
  54         g_error(_("CORBA Exception occured: id=\"%s\", value=%p"),
  55                         CORBA_exception_id(evp),CORBA_exception_value(evp));
  56         CORBA_exception_free(evp);
  57         return FALSE;
  58 }
  59
  60 CORBA_Environment captive_corba_ev;
  61 CORBA_ORB captive_corba_orb;
  62 PortableServer_POA captive_corba_poa;
  63
  64 static void corba_shutdown_atexit(void);
  65
  66 static gboolean corba_init(const char *pname,CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
  67 {
  68 static gboolean done=FALSE;
  69 int orb_argc=1;
  70 gchar *orb_argv[]={
  71                 (gchar *)captive_strdup_alloca(pname),
  72                 NULL};
  73
  74         g_return_val_if_fail(evp!=NULL,FALSE);
  75         g_return_val_if_fail(orbp!=NULL,FALSE);
  76         g_return_val_if_fail(poap!=NULL,FALSE);
  77
  78         if (done)
  79                 return TRUE;    /* FIXME: '*poap' is left invalid! */
  80
  81         /* Init 'ev' */
  82         CORBA_exception_init(evp);
  83
  84         /* Init 'orb' */
  85         *orbp=CORBA_ORB_init(&orb_argc,orb_argv,"orbit-local-orb",evp);
  86         g_return_val_if_fail(*orbp!=CORBA_OBJECT_NIL,FALSE);
  87         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  88
  89         /* Init 'poa' */
  90         *poap=(PortableServer_POA)CORBA_ORB_resolve_initial_references(*orbp,"RootPOA",evp);
  91         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  92         {
  93 PortableServer_POAManager poa_mgr;
  94                 poa_mgr=PortableServer_POA__get_the_POAManager(*poap,evp);
  95                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  96                 PortableServer_POAManager_activate(poa_mgr,evp);
  97                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  98                 CORBA_Object_release((CORBA_Object)poa_mgr,evp);
  99                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 100                 }
 101
 102         g_atexit(corba_shutdown_atexit);
 103
 104         done=TRUE;
 105         return TRUE;
 106 }
 107
 108
 109 static CORBA_ORB heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 110
 111 gboolean corba_shutdown(CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
 112 {
 113 PortableServer_POA poa;
 114 CORBA_ORB orb;
 115
 116         g_return_val_if_fail(evp!=NULL,FALSE);
 117         g_return_val_if_fail(orbp!=NULL,FALSE);
 118         g_return_val_if_fail(poap!=NULL,FALSE);
 119
 120         /* Shutdown 'poa' */
 121         poa=*poap;
 122         *poap=CORBA_OBJECT_NIL;
 123         CORBA_Object_release((CORBA_Object)poa,evp);
 124         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 125
 126         /* Shutdown 'orb' */
 127         orb=*orbp;
 128         *orbp=CORBA_OBJECT_NIL;
 129         heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 130         CORBA_ORB_destroy(orb,evp);
 131         /* Do not: g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 132          * here as CORBA_ORB_destroy() sometimes reports:
 133          *      WARNING **: ORB: a total of X refs to X ORB objects were leaked
 134          */
 135         CORBA_exception_free(evp);
 136
 137         /* Shutdown 'ev' */
 138         CORBA_exception_free(evp);
 139
 140         return TRUE;
 141 }
 142
 143 static void sandbox_parent_own_orbit_dir_cleanup_atexit(void);
 144
 145 static void corba_shutdown_atexit(void)
 146 {
 147 gboolean errbool;
 148
 149         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 150         g_assert(errbool==TRUE);
 151
 152         /* Delete the CORBA ORB socket directory only after full CORBA ORB shutdown. */
 153         sandbox_parent_own_orbit_dir_cleanup_atexit();
 154 }
 155
 156
 157 static GSource *captive_corba_sandbox_child_heartbeat_gsource;
 158
 159 #if 0   /* Currently unused - see server-Vfs.c:impl_Captive_Vfs_shutdown() */
 160 void sandbox_child_prepare_shutdown(void)
 161 {
 162         /* Prevent during shutdown: Captive-WARNING **: CORBA Exception occured: id="IDL:omg.org/CORBA/COMM_FAILURE:1.0" */
 163         if (captive_corba_sandbox_child_heartbeat_gsource) {
 164                 g_source_destroy(captive_corba_sandbox_child_heartbeat_gsource);
 165                 g_source_unref(captive_corba_sandbox_child_heartbeat_gsource);
 166                 captive_corba_sandbox_child_heartbeat_gsource=NULL;
 167                 }
 168 }
 169 #endif
 170
 171
 172 void sandbox_child_shutdown(void)
 173 {
 174         /* Do not fail by passing logging messages to the master. */
 175         impl_Captive_Vfs_init_g_log_func_disable();
 176
 177         g_main_loop_quit(linc_main_get_loop());
 178 }
 179
 180
 181 static gboolean heartbeat_source_callback(gpointer data /* unused */)
 182 {
 183         g_return_val_if_fail(heartbeat_source_callback_orb!=CORBA_OBJECT_NIL,FALSE);    /* the source should be removed */
 184
 185         sandbox_child_shutdown();
 186
 187         return FALSE;   /* the source should be removed */
 188 }
 189
 190
 191 static gboolean heartbeat_source_prepare(GSource *source,gint *timeout)
 192 {
 193         *timeout=-1;
 194
 195         return FALSE;
 196 }
 197
 198 static GPollFD heartbeat_source_check_gpollfd;
 199
 200 static gboolean heartbeat_source_check(GSource *source)
 201 {
 202         return !!(heartbeat_source_check_gpollfd.revents & HEARTBEAT_SOURCE_CHECK_REVENTS);
 203 }
 204
 205 static gboolean heartbeat_source_dispatch(GSource *source,GSourceFunc callback,gpointer user_data)
 206 {
 207         g_assert(callback!=NULL);
 208         return (*callback)(user_data);
 209 }
 210
 211 static GSourceFuncs heartbeat_source_watch_funcs={
 212                 heartbeat_source_prepare,
 213                 heartbeat_source_check,
 214                 heartbeat_source_dispatch,
 215                 NULL,   /* finalize */
 216                 };
 217
 218 void captive_corba_sandbox_child(const gchar *chrooted_orbit_dir)
 219 {
 220 Captive_Vfs Vfs_object;
 221 impl_POA_Captive_Vfs *Vfs_servant;
 222 gboolean errbool;
 223 guint errguint;
 224 int errint;
 225
 226         /* attach heartbeat_source_callback() to watch for any abnormalities
 227          * on our open pipe 'parentheart_fds' and terminate the child if parent dies.
 228          */
 229         captive_corba_sandbox_child_heartbeat_gsource=g_source_new(&heartbeat_source_watch_funcs,sizeof(GSource));
 230         g_return_if_fail(captive_corba_sandbox_child_heartbeat_gsource!=NULL);
 231         g_source_set_callback(
 232                         captive_corba_sandbox_child_heartbeat_gsource,  /* source */
 233                         heartbeat_source_callback,      /* func */
 234                         NULL,   /* data */
 235                         NULL);  /* notify */
 236         heartbeat_source_check_gpollfd.fd=0 /* STDIN */;        /* parentheart_fd_read */
 237         heartbeat_source_check_gpollfd.events=HEARTBEAT_SOURCE_CHECK_EVENTS;
 238         heartbeat_source_check_gpollfd.revents=0;
 239         g_source_add_poll(captive_corba_sandbox_child_heartbeat_gsource,&heartbeat_source_check_gpollfd);
 240
 241         errbool=corba_init("captive-sandbox-child",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 242         g_return_if_fail(errbool==TRUE);
 243
 244         heartbeat_source_callback_orb=captive_corba_orb;
 245
 246         /* linc_main_get_loop() makes sense only after corba_init() -> CORBA_ORB_init() */
 247         errguint=g_source_attach(
 248                         captive_corba_sandbox_child_heartbeat_gsource,  /* source */
 249                         g_main_loop_get_context(linc_main_get_loop())); /* context; NULL means 'default context' */
 250         g_assert(errguint!=0);
 251
 252         /* Init 'Vfs_object' */
 253         Vfs_object=impl_Captive_Vfs__create(captive_corba_poa,&captive_corba_ev);
 254         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 255
 256         /* Pass IOR to our parent.
 257          * It will also create the socket needed for 'chrooted_orbit_dir' below
 258          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 259          */
 260         {
 261 char *Vfs_IOR;
 262                 Vfs_IOR=CORBA_ORB_object_to_string(captive_corba_orb,Vfs_object,&captive_corba_ev);
 263                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 264                 g_assert(Vfs_IOR!=NULL);
 265                 errint=printf("ior=%s\n",Vfs_IOR);
 266                 g_assert(errint>=0);
 267                 CORBA_free(Vfs_IOR);
 268                 }
 269
 270         /* Default mode is 0700, permit parent non-"captive" users to access our IOR socket. */
 271         if (chrooted_orbit_dir) {
 272 DIR *dir;
 273 struct dirent *dirent;
 274 const gchar *socketname=NULL,*socketpathname;
 275
 276                 errint=chmod(chrooted_orbit_dir,0755);
 277                 g_assert(errint==0);
 278
 279                 dir=opendir(chrooted_orbit_dir);
 280                 g_assert(dir!=NULL);
 281                 while (errno=0,(dirent=readdir(dir))) {
 282                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 283                                 continue;
 284                         g_assert(socketname==NULL);
 285                         socketname=captive_strdup_alloca(dirent->d_name);
 286                         }
 287                 g_assert(errno==0);
 288                 errint=closedir(dir);
 289                 g_assert(errint==0);
 290                 g_assert(socketname!=NULL);
 291
 292                 socketpathname=captive_printf_alloca("%s/%s",chrooted_orbit_dir,socketname);
 293                 errint=chmod(socketpathname,0666);
 294                 g_assert(errint==0);
 295
 296                 printf("socketname=%s\n",socketname);
 297                 }
 298
 299         /* Close the output to flush it to our spawning parent. */
 300         errint=fflush(stdout);
 301         g_assert(errint==0);
 302         errint=fclose(stdout);
 303         g_assert(errint==0);
 304
 305         /* CORBA_ORB_run() -> linc_main_loop_run() -> g_main_loop_run()
 306          * and therefore we should be safe with glib events handling.
 307          */
 308         CORBA_ORB_run(captive_corba_orb,&captive_corba_ev);
 309         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 310
 311         /* Shutdown 'Vfs' servant */
 312         Vfs_servant=PortableServer_POA_reference_to_servant(captive_corba_poa,Vfs_object,&captive_corba_ev);
 313         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 314         CORBA_Object_release(Vfs_object,&captive_corba_ev);
 315         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 316         impl_Captive_Vfs__destroy(Vfs_servant,&captive_corba_ev);
 317         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 318
 319         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 320         g_assert(errbool==TRUE);
 321
 322         _exit(EXIT_SUCCESS);
 323 }
 324
 325
 326 static void options_module_captive_to_options_module_corba
 327                 (Captive_CaptiveOptionsModule *dest_options_module_corba,const struct captive_options_module *src_options_module_captive)
 328 {
 329         g_return_if_fail(dest_options_module_corba!=NULL);
 330         g_return_if_fail(src_options_module_captive!=NULL);
 331
 332         g_return_if_fail(src_options_module_captive->type==CAPTIVE_OPTIONS_MODULE_TYPE_PE32);
 333
 334         dest_options_module_corba->pathname_utf8=g_strdup(src_options_module_captive->pathname_utf8);
 335         dest_options_module_corba->data._buffer=g_memdup(src_options_module_captive->u.pe32.base,
 336                         src_options_module_captive->u.pe32.length);
 337         dest_options_module_corba->data._maximum=src_options_module_captive->u.pe32.length;
 338         dest_options_module_corba->data._length =src_options_module_captive->u.pe32.length;
 339         dest_options_module_corba->data._release=TRUE;
 340 }
 341
 342 static void unlink_nonrecursive(const gchar *dirname)
 343 {
 344 DIR *dir;
 345 struct dirent *dirent;
 346 int errint;
 347
 348         dir=opendir(dirname);
 349         g_assert(dir!=NULL);
 350
 351         while (errno=0,(dirent=readdir(dir))) {
 352 gchar *pathname;
 353
 354                 if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 355                         continue;
 356                 pathname=g_strdup_printf("%s/%s",dirname,dirent->d_name);
 357                 errint=unlink(pathname);
 358                 g_assert(errint==0);
 359                 g_free(pathname);
 360                 }
 361         g_assert(errno==0);
 362         errint=closedir(dir);
 363         g_assert(errint==0);
 364         errint=rmdir(dirname);
 365         g_assert(errint==0);
 366 }
 367
 368 static const gchar *sandbox_parent_own_orbit_dir;
 369 static const gchar *sandbox_parent_own_orbit_socket;
 370
 371 static void sandbox_parent_own_orbit_dir_cleanup_atexit(void)
 372 {
 373 static gboolean done=FALSE;
 374
 375         g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s; done=%d",G_STRLOC,(int)done);
 376         if (done)
 377                 return;
 378         done=TRUE;
 379
 380         if (sandbox_parent_own_orbit_dir)
 381                 unlink_nonrecursive(sandbox_parent_own_orbit_dir);
 382 }
 383
 384 static struct sandbox_parent_own_orbit_dir_cleanup_signal {
 385         int signum;
 386         /* FIXME: Why we cannot use 'sighandler_t'? */ void (*sighandler_orig)(int signum);
 387         } sandbox_parent_own_orbit_dir_cleanup_signals[]={
 388                 { SIGINT  },
 389                 { SIGQUIT },
 390                 { SIGTERM },
 391                 { SIGHUP  },
 392                 { SIGABRT },
 393                 { SIGFPE  },
 394                 };
 395
 396 static void sandbox_parent_own_orbit_dir_cleanup_sighandler(int signum)
 397 {
 398 struct sandbox_parent_own_orbit_dir_cleanup_signal *sigstructp;
 399
 400         for (
 401                         sigstructp=sandbox_parent_own_orbit_dir_cleanup_signals;
 402                         sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals);
 403                         sigstructp++) {
 404                 if (sigstructp->signum==signum)
 405                         break;
 406                 }
 407         g_assert(sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals));
 408         signal(signum,sigstructp->sighandler_orig);
 409
 410         /* Prevent recursive fatal logging before signal restore: */
 411         g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s: signum=%d,sighandler_orig=%p",G_STRLOC,signum,sigstructp->sighandler_orig);
 412
 413         sandbox_parent_own_orbit_dir_cleanup_atexit();
 414
 415         g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s: re-raising...",G_STRLOC);
 416         raise(signum);
 417 }
 418
 419 static void sandbox_parent_own_orbit_dir_cleanup_init(void)
 420 {
 421 struct sandbox_parent_own_orbit_dir_cleanup_signal *sigstructp;
 422
 423         for (
 424                         sigstructp=sandbox_parent_own_orbit_dir_cleanup_signals;
 425                         sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals);
 426                         sigstructp++) {
 427                 sigstructp->sighandler_orig=signal(sigstructp->signum,sandbox_parent_own_orbit_dir_cleanup_sighandler);
 428                 if (sigstructp->sighandler_orig==SIG_IGN)
 429                         sigstructp->sighandler_orig=SIG_DFL;
 430                 }
 431 }
 432
 433 static gchar *sandbox_parent_read_ior
 434                 (int Vfs_IOR_fd_read,gchar **child_chroot_pid_hashkey_dirp,CaptiveVfsParentObject *captive_vfs_parent_object)
 435 {
 436 gchar *data;
 437 gsize data_size;
 438 GHashTable *hash;
 439 gchar *ior,*child_chroot_pid_hashkey_dir;
 440 int errint;
 441 gchar *s,*sd,*se;
 442 gboolean errbool;
 443
 444         /* Initialize /tmp/orbit-$username directory for linking IOR socket. */
 445         errbool=corba_init("captive-sandbox-parent",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 446         g_assert(errbool==TRUE);
 447
 448         /* FIXME: Security: Duplicate giop_tmpdir_init() here. */
 449         if (!sandbox_parent_own_orbit_dir) {
 450                 sandbox_parent_own_orbit_dir=g_strdup_printf("/tmp/captive-orbit-%d",getpid());
 451                 if (mkdir(sandbox_parent_own_orbit_dir,0700)) {
 452                         g_assert(errno==EEXIST);
 453                         sandbox_parent_own_orbit_dir_cleanup_init();
 454                         unlink_nonrecursive(sandbox_parent_own_orbit_dir);
 455                         if (mkdir(sandbox_parent_own_orbit_dir,0700))
 456                                 g_assert_not_reached();
 457                         }
 458                 sandbox_parent_own_orbit_dir_cleanup_init();
 459                 linc_set_tmpdir(sandbox_parent_own_orbit_dir);
 460                 }
 461
 462         data=captive_rtl_file_read(Vfs_IOR_fd_read,&data_size); /* data_fd_read */
 463         errint=close(Vfs_IOR_fd_read);
 464         g_assert(errint==0);
 465         g_assert(data!=NULL);
 466         g_assert(data_size>=1);
 467         g_assert(data[data_size-1]=='\n');
 468
 469         hash=g_hash_table_new(g_str_hash,g_str_equal);
 470
 471         for (s=data;s<data+data_size;s=se+1) {
 472                 se=strchr(s,'\n');
 473                 g_assert(se!=NULL);
 474                 *se=0;
 475                 sd=strchr(s,'=');
 476                 g_assert(sd!=NULL);
 477                 *sd=0;
 478                 g_hash_table_insert(hash,s,sd+1);
 479                 }
 480         g_assert(s==data+data_size);
 481
 482         if ((child_chroot_pid_hashkey_dir=g_hash_table_lookup(hash,"chroot_pid_hashkey_dir"))) {
 483 const gchar *socketname,*socketpathname_src,*socketpathname_dest;
 484 const gchar *chrooted_orbit_dir;
 485
 486                 /* IOR contains the full pathname with the setuid username encoded. */
 487                 chrooted_orbit_dir=g_hash_table_lookup(hash,"chrooted_orbit_dir");
 488                 g_assert(chrooted_orbit_dir!=NULL);
 489                 captive_vfs_parent_object->corba_chrooted_orbit_dir=g_strdup(chrooted_orbit_dir);
 490                 /* 0700 as this directory will not be reused
 491                  * to commuicate with any other sandbox child.
 492                  */
 493                 if (mkdir(chrooted_orbit_dir,0700)) {
 494                         g_assert(errno==EEXIST);
 495                         }
 496
 497                 socketname=g_hash_table_lookup(hash,"socketname");
 498                 g_assert(socketname!=NULL);
 499                 captive_vfs_parent_object->corba_socketname=g_strdup(socketname);
 500
 501                 socketpathname_src=captive_printf_alloca("%s/%s/%s",child_chroot_pid_hashkey_dir,chrooted_orbit_dir,socketname);
 502                 socketpathname_dest=g_strdup_printf("%s/%s",chrooted_orbit_dir,socketname);
 503                 errint=link(socketpathname_src,socketpathname_dest);
 504                 if (errint)
 505                         g_error("link(\"%s\",\"%s\")=%d:%m",socketpathname_src,socketpathname_dest,errint);
 506                 }
 507         if (child_chroot_pid_hashkey_dirp)
 508                 *child_chroot_pid_hashkey_dirp=g_strdup(child_chroot_pid_hashkey_dir);
 509
 510         ior=g_hash_table_lookup(hash,"ior");
 511         g_assert(ior!=NULL);
 512         ior=g_strdup(ior);
 513         g_free(data);
 514
 515         g_hash_table_destroy(hash);
 516
 517         return ior;
 518 }
 519
 520
 521 static xmlNode *options_module_captive_to_xml
 522                 (xmlNode *dest_xml_parent,const struct captive_options_module *src_options_module_captive)
 523 {
 524         g_return_val_if_fail(dest_xml_parent!=NULL,NULL);
 525         g_return_val_if_fail(src_options_module_captive!=NULL,NULL);
 526
 527         { xmlNode *module=xmlNewTextChild(dest_xml_parent,NULL,"module",NULL);
 528         const gchar *type_string="???"; /* Prevent: ... might be used uninitialized in this function */
 529         const gchar *basename,*cgs;
 530
 531                 basename=src_options_module_captive->pathname_utf8;
 532                 if ((cgs=strrchr(basename,'/')))
 533                         basename=cgs+1;
 534                 xmlNewProp(module,"basename",basename);
 535                 switch (src_options_module_captive->type) {
 536                         case CAPTIVE_OPTIONS_MODULE_TYPE_PE32:
 537                                 type_string="PE32";
 538                                 xmlNewProp(module,"length",captive_printf_alloca("%lu",(unsigned long)src_options_module_captive->u.pe32.length));
 539                                 xmlNewProp(module,"md5"   ,src_options_module_captive->u.pe32.md5);
 540                                 break;
 541                         case CAPTIVE_OPTIONS_MODULE_TYPE_GMODULE:
 542                                 type_string="gmodule";
 543                                 break;
 544                         default: g_assert_not_reached();
 545                         }
 546                 xmlNewProp(module,"type",type_string);  /* AFTER the 'switch' to set 'type_string'! */
 547                 return module;
 548                 }
 549 }
 550
 551
 552 static void sandbox_parent_bug_doc_make(CaptiveVfsParentObject *captive_vfs_parent_object)
 553 {
 554         { xmlDoc *doc=xmlNewDoc("1.0");
 555                 captive_vfs_parent_object->corba_bug_doc=doc;
 556                 { xmlNode *bug=xmlNewDocNode(captive_vfs_parent_object->corba_bug_doc,NULL,"bug",NULL);
 557                         xmlDocSetRootElement(captive_vfs_parent_object->corba_bug_doc,bug);
 558                         captive_vfs_parent_object->corba_bug=bug;
 559                         { xmlNode *bug_captive=xmlNewTextChild(bug,NULL,"captive",NULL);
 560                                 xmlNewProp(bug_captive,"version",VERSION);
 561                                 }
 562                         { xmlNode *bug_filesystem=xmlNewTextChild(bug,NULL,"filesystem",NULL);
 563                                 options_module_captive_to_xml(bug_filesystem,&CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.filesystem);
 564                                 }
 565                         { xmlNode *bug_load_module=xmlNewTextChild(bug,NULL,"load_module",NULL);
 566                         guint load_moduleui;
 567                         struct captive_options_module *options_module;
 568                         GList *load_module_node;
 569
 570                                 for (load_moduleui=0,load_module_node=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module;
 571                                                 load_module_node;
 572                                                 load_moduleui++,load_module_node=load_module_node->next) {
 573                                         options_module=load_module_node->data;
 574                                         options_module_captive_to_xml(bug_load_module,options_module);
 575                                         }
 576                                 }
 577                         { xmlNode *bug_action=xmlNewTextChild(bug,NULL,"action",NULL);
 578                                 captive_vfs_parent_object->corba_bug_action=bug_action;
 579                                 }
 580                         { xmlNode *bug_log=xmlNewTextChild(bug,NULL,"log",NULL);
 581                                 captive_vfs_parent_object->corba_bug_log=bug_log;
 582                                 }
 583                         }
 584                 }
 585 }
 586
 587
 588 static void sandbox_parent(const gchar *Vfs_IOR,const gchar *child_chroot_pid_hashkey_dir,CaptiveVfsParentObject *captive_vfs_parent_object)
 589 {
 590 Captive_Vfs Vfs_object;
 591 Captive_GLogFunc GLogFunc_object;
 592 Captive_CaptiveIOChannel CaptiveIOChannel_object;
 593 Captive_CaptiveOptions options_corba;
 594 guint load_module_length,load_moduleui;
 595 struct captive_options_module *options_module;
 596 GList *load_module_node;
 597 const gchar *child_chroot_parent_own_orbit_socket,*child_chroot_parent_own_orbit_dir;
 598 int errint;
 599
 600         g_return_if_fail(Vfs_IOR!=NULL);
 601         /* 'child_chroot_pid_hashkey_dir' may be NULL */
 602         g_return_if_fail(CAPTIVE_VFS_PARENT_IS_OBJECT(captive_vfs_parent_object));
 603
 604         Vfs_object=CORBA_ORB_string_to_object(captive_corba_orb,Vfs_IOR,&captive_corba_ev);
 605         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 606
 607         /* Init 'GLogFunc_object' */
 608         GLogFunc_object=impl_Captive_GLogFunc__create(captive_corba_poa,captive_vfs_parent_object,&captive_corba_ev);
 609         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 610
 611         /* Init 'CaptiveIOChannel_object' */
 612         if (!captive_vfs_parent_object->corba_parent_giochanel_blind_source)
 613                 switch (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode) {
 614                         case CAPTIVE_OPTION_RWMODE_RO:
 615                         case CAPTIVE_OPTION_RWMODE_RW:
 616                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.image_iochannel;
 617                                 break;
 618                         case CAPTIVE_OPTION_RWMODE_BLIND:
 619                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source=(GIOChannel *)captive_giochannel_blind_new(
 620                                                 CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.image_iochannel, /* giochannel_orig */
 621                                                 TRUE); /* writeable */
 622                                 break;
 623                         default: g_assert_not_reached();
 624                         }
 625         if (!captive_vfs_parent_object->corba_parent_giochanel_blind)
 626                 captive_vfs_parent_object->corba_parent_giochanel_blind=(GIOChannel *)captive_giochannel_blind_new(
 627                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source,  /* giochannel_orig */
 628                                 (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode!=CAPTIVE_OPTION_RWMODE_RO)); /* writeable */
 629         CaptiveIOChannel_object=impl_Captive_CaptiveIOChannel__create(captive_corba_poa,
 630                         captive_vfs_parent_object->corba_parent_giochanel_blind,&captive_corba_ev);
 631         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 632
 633         /* Create the socket needed for 'sandbox_parent_own_orbit_socket' below
 634          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 635          */
 636         {
 637 char *GLogFunc_IOR;
 638                 GLogFunc_IOR=CORBA_ORB_object_to_string(captive_corba_orb,GLogFunc_object,&captive_corba_ev);
 639                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 640                 g_assert(GLogFunc_IOR!=NULL);
 641                 CORBA_free(GLogFunc_IOR);
 642                 }
 643
 644         if (sandbox_parent_own_orbit_dir && !sandbox_parent_own_orbit_socket) {
 645 DIR *dir;
 646 struct dirent *dirent;
 647
 648                 dir=opendir(sandbox_parent_own_orbit_dir);
 649                 g_assert(dir!=NULL);
 650
 651                 while (errno=0,(dirent=readdir(dir))) {
 652                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 653                                 continue;
 654                         g_assert(sandbox_parent_own_orbit_socket==NULL);
 655                         sandbox_parent_own_orbit_socket=g_strdup_printf("%s/%s",sandbox_parent_own_orbit_dir,dirent->d_name);
 656                         }
 657                 g_assert(errno==0);
 658                 errint=closedir(dir);
 659                 g_assert(errint==0);
 660                 g_assert(sandbox_parent_own_orbit_socket!=NULL);
 661                 }
 662
 663         if (child_chroot_pid_hashkey_dir) {
 664                 child_chroot_parent_own_orbit_dir=captive_printf_alloca("%s/%s",child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_dir);
 665                 errint=mkdir(child_chroot_parent_own_orbit_dir,0777);
 666                 g_assert(errint==0);
 667                 /* chmod(2) it to prevent mode limitation by
 668                  * active ulimit(2) of being executed by mount(8).
 669                  */
 670                 errint=chmod(child_chroot_parent_own_orbit_dir,0777);
 671                 g_assert(errint==0);
 672                 child_chroot_parent_own_orbit_socket=captive_printf_alloca("%s/%s",
 673                                 child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_socket);
 674                 errint=link(sandbox_parent_own_orbit_socket,child_chroot_parent_own_orbit_socket);
 675                 g_assert(errint==0);
 676                 /* chmod(2)s also our orig. one (!) but this one is protected by its 0777 directory. */
 677                 errint=chmod(child_chroot_parent_own_orbit_socket,0666);
 678                 g_assert(errint==0);
 679                 }
 680
 681         options_corba.g_log_func=GLogFunc_object;
 682         options_module_captive_to_options_module_corba(&options_corba.filesystem,&CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.filesystem);
 683         /* Prevent secondary captive_giochannel_blind inside of our sandbox child
 684          * as we already have one captive_giochannel_blind in the parent.
 685          */
 686         options_corba.rwmode        =(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode == CAPTIVE_OPTION_RWMODE_BLIND ? CAPTIVE_OPTION_RWMODE_RW
 687                         : CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode);
 688         options_corba.media         =CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.media;
 689         options_corba.debug_messages=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.debug_messages;
 690         options_corba.image_iochannel=CaptiveIOChannel_object;
 691
 692         load_module_length=g_list_length(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module);
 693         captive_newn(options_corba.load_module._buffer,load_module_length);
 694         options_corba.load_module._maximum=load_module_length;
 695         options_corba.load_module._length=load_module_length;
 696         options_corba.load_module._release=TRUE;
 697         for (load_moduleui=0,load_module_node=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module;
 698                         load_module_node;
 699                         load_moduleui++,load_module_node=load_module_node->next) {
 700                 options_module=load_module_node->data;
 701                 options_module_captive_to_options_module_corba(options_corba.load_module._buffer+load_moduleui,options_module);
 702                 }
 703
 704         Captive_Vfs_init(Vfs_object,&options_corba,&captive_corba_ev);
 705         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 706
 707         /* FIXME: Free 'options_corba' - LEAK */
 708
 709         captive_vfs_parent_object->corba_Vfs_object=Vfs_object;
 710         captive_vfs_parent_object->corba_GLogFunc_object=GLogFunc_object;
 711         captive_vfs_parent_object->corba_CaptiveIOChannel_object=CaptiveIOChannel_object;
 712
 713         if (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.bug_pathname)
 714                 sandbox_parent_bug_doc_make(captive_vfs_parent_object);
 715 }
 716
 717 static void fd_shiftup(int *fdp)
 718 {
 719         g_return_if_fail(fdp!=NULL);
 720
 721         while (*fdp<=2 /* STDERR */) {
 722                 *fdp=dup(*fdp);
 723                 g_assert(*fdp!=-1);
 724                 }
 725 }
 726
 727 void captive_sandbox_fd_closeup(int fd_first_to_delete)
 728 {
 729 DIR *dir;
 730 int errint;
 731 int dir_fd;
 732 struct dirent *dirent;
 733
 734         dir=opendir("/proc/self/fd/");
 735         g_return_if_fail(dir!=NULL);
 736         dir_fd=dirfd(dir);
 737         g_return_if_fail(dir_fd!=-1);
 738
 739         while (errno=0,(dirent=readdir(dir))) {
 740 long dirent_fd;
 741 char *endptr;
 742
 743                 if (0
 744                                 || !strcmp(dirent->d_name,".")
 745                                 || !strcmp(dirent->d_name,".."))
 746                         continue;
 747                 dirent_fd=strtol(dirent->d_name,&endptr,10 /* base */);
 748                 g_assert(dirent_fd>=0 && (!endptr || !*endptr));
 749                 if (dirent_fd<fd_first_to_delete || dirent_fd==dir_fd)
 750                         continue;
 751
 752                 errint=close(dirent_fd);
 753                 g_assert(errint==0);
 754                 errno=0;
 755                 errint=close(dirent_fd);
 756                 g_assert(errint==-1); g_assert(errno==EBADF);
 757                 }
 758         g_return_if_fail(errno==0);     /* check for EOF */
 759
 760         errint=closedir(dir);
 761         g_return_if_fail(errint==0);
 762         errno=0;
 763         close(dir_fd); g_assert(errno==EBADF);  /* just a bit of paranoia; it should be already closed by closedir() */
 764 }
 765
 766 gboolean captive_sandbox_spawn(CaptiveVfsParentObject *captive_vfs_parent_object)
 767 {
 768 /* Vfs_IOR_fds[0] for reading by sandbox_parent() - client,
 769  * Vfs_IOR_fds[1] for writing by sandbox_child()  - server
 770  */
 771 int Vfs_IOR_fds[2],parentheart_fds[2];
 772 int errint;
 773 gboolean errbool;
 774
 775         g_return_val_if_fail(CAPTIVE_VFS_PARENT_IS_OBJECT(captive_vfs_parent_object),FALSE);
 776
 777         errint=pipe(Vfs_IOR_fds);
 778         g_return_val_if_fail(errint==0,FALSE);
 779         errint=pipe(parentheart_fds);
 780         g_return_val_if_fail(errint==0,FALSE);
 781
 782         /* Currently never called anywhere:
 783          *     errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 784          *     g_assert(errbool==TRUE);
 785          */
 786
 787         if (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior) {
 788                 g_assert(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv==NULL);
 789
 790                 errbool=corba_init("captive-sandbox-parent",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 791                 g_assert(errbool==TRUE);
 792
 793                 captive_vfs_parent_object->corba_parentheart_fds_1=-1;
 794                 captive_vfs_parent_object->corba_child_pid=-1;
 795                 sandbox_parent(
 796                                 CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior,      /* Vfs_IOR */
 797                                 NULL,   /* child_chroot_pid_hashkey_dir */
 798                                 captive_vfs_parent_object);     /* captive_vfs_parent_object */
 799                 return TRUE;
 800                 }
 801
 802         g_assert(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv!=NULL);
 803         switch ((captive_vfs_parent_object->corba_child_pid=fork())) {
 804                 case -1:        /* error */
 805                         g_return_val_if_reached(FALSE);
 806
 807                 case 0: { /* child */
 808
 809                         errint=close(Vfs_IOR_fds[0]);   /* close Vfs_IOR_fd_read */
 810                         g_return_val_if_fail(errint==0,FALSE);
 811                         errint=close(parentheart_fds[1]);       /* close parentheart_fd_write */
 812                         g_return_val_if_fail(errint==0,FALSE);
 813
 814                         fd_shiftup(Vfs_IOR_fds+1);      /* Vfs_IOR_fd_write */
 815                         fd_shiftup(parentheart_fds+0);  /* parentheart_fd_read */
 816                         errint=dup2(Vfs_IOR_fds[1],1 /* STDOUT */);     /* Vfs_IOR_fd_write */
 817                         g_return_val_if_fail(errint==1 /* STDOUT */,FALSE);
 818                         errint=dup2(parentheart_fds[0],0 /* STDIN */);  /* parentheart_fd_read */
 819                         g_return_val_if_fail(errint==0 /* STDIN */,FALSE);
 820
 821                         captive_sandbox_fd_closeup(2 /* STDERR */ +1);
 822
 823                         execv(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv[0],
 824                                         /* re-const */ (char * const *)CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv);
 825                         g_return_val_if_reached(FALSE);
 826                         } /* NOTREACHED */
 827
 828                 default: {      /* parent */
 829 gchar *Vfs_IOR;
 830 gchar *child_chroot_pid_hashkey_dir;
 831
 832                         errint=close(Vfs_IOR_fds[1]);   /* close Vfs_IOR_fd_write */
 833                         g_return_val_if_fail(errint==0,FALSE);
 834                         errint=close(parentheart_fds[0]);       /* close parentheart_fd_read */
 835                         g_return_val_if_fail(errint==0,FALSE);
 836                         errint=fcntl(parentheart_fds[1],F_SETFD,FD_CLOEXEC);
 837                         /* This fcntl(2) may not be enough - some fork(2) may duplicate this
 838                          * write descriptor and even if we do some process finish the child
 839                          * may remain alone connected with some unknown fork(2)er from us.
 840                          * Currently I am not aware such case would occur.
 841                          */
 842                         g_return_val_if_fail(errint==0,FALSE);
 843                         captive_vfs_parent_object->corba_parentheart_fds_1=parentheart_fds[1];
 844
 845                         Vfs_IOR=sandbox_parent_read_ior(
 846                                         Vfs_IOR_fds[0], /* Vfs_IOR_fd_read */
 847                                         &child_chroot_pid_hashkey_dir,
 848                                         captive_vfs_parent_object);
 849
 850                         sandbox_parent(
 851                                         Vfs_IOR,        /* Vfs_IOR */
 852                                         child_chroot_pid_hashkey_dir,   /* child_chroot_pid_hashkey_dir */
 853                                         captive_vfs_parent_object);     /* captive_vfs_parent_object */
 854
 855                         g_free(Vfs_IOR);
 856                         g_free(child_chroot_pid_hashkey_dir);
 857
 858                         /* 'parentheart_fds[1]' - parentheart_fd_write - is left open here */
 859                         return TRUE;
 860                         }
 861                 }
 862         /* NOTREACHED */
 863         g_return_val_if_reached(FALSE);
 864 }
 865
 866
 867 GnomeVFSResult captive_sandbox_parent_return_from_CORBA_Environment
 868                 (CORBA_Environment *evp,CaptiveVfsParentObject *captive_vfs_parent_object)
 869 {
 870 GnomeVFSResult r;
 871
 872         if (evp->_major==CORBA_NO_EXCEPTION)
 873                 return GNOME_VFS_OK;
 874
 875         /* If !CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv it is CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior
 876          * where we cannot do any restart anyway.
 877          */
 878         if (captive_vfs_parent_object && CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv
 879                         && (evp->_major==CORBA_SYSTEM_EXCEPTION && !strcmp(ex_CORBA_COMM_FAILURE,CORBA_exception_id(evp)))) {
 880                 r=GNOME_VFS_ERROR_SERVICE_NOT_AVAILABLE;
 881                 if (captive_vfs_parent_object->corba_Vfs_object!=CORBA_OBJECT_NIL)
 882                         captive_vfs_parent_object_aborted(captive_vfs_parent_object);   /* errors ignored */
 883                 }
 884         else if (evp->_major==CORBA_USER_EXCEPTION && !strcmp(ex_Captive_GnomeVFSResultException,CORBA_exception_id(evp))) {
 885                 r=((Captive_GnomeVFSResultException *)CORBA_exception_value(evp))->gnome_vfs_result;
 886                 g_assert(r!=GNOME_VFS_ERROR_SERVICE_NOT_AVAILABLE);     /* code reserved for sandbox restarts */
 887                 }
 888         else {
 889                 r=GNOME_VFS_ERROR_GENERIC;
 890                 g_warning(_("CORBA Exception occured: id=\"%s\", value=%p"),
 891                                 CORBA_exception_id(evp),CORBA_exception_value(evp));
 892                 }
 893         CORBA_exception_free(evp);
 894
 895         return r;
 896 }
 897
 898
 899 void captive_sandbox_child_GnomeVFSResultException_throw(CORBA_Environment *evp,GnomeVFSResult errvfsresult)
 900 {
 901 Captive_GnomeVFSResultException *gnome_vfs_result_exception;
 902
 903         g_return_if_fail(evp!=NULL);
 904
 905         gnome_vfs_result_exception=Captive_GnomeVFSResultException__alloc();
 906         gnome_vfs_result_exception->gnome_vfs_result=errvfsresult;
 907         CORBA_exception_set(evp,CORBA_USER_EXCEPTION,ex_Captive_GnomeVFSResultException,gnome_vfs_result_exception);
 908 }