scheduler/process.c

   1 /*
   2  * "$Id$"
   3  *
   4  * Process management routines for the CUPS scheduler.
   5  *
   6  * Copyright 2007-2014 by Apple Inc.
   7  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
   8  *
   9  * These coded instructions, statements, and computer programs are the
  10  * property of Apple Inc. and are protected by Federal copyright
  11  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  * which should have been included with this file.  If this file is
  13  * file is missing or damaged, see the license at "http://www.cups.org/".
  14  */
  15
  16 /*
  17  * Include necessary headers...
  18  */
  19
  20 #include "cupsd.h"
  21 #include <grp.h>
  22 #ifdef __APPLE__
  23 #  include <libgen.h>
  24 #endif /* __APPLE__ */
  25 #ifdef HAVE_POSIX_SPAWN
  26 #  include <spawn.h>
  27 extern char **environ;
  28 #endif /* HAVE_POSIX_SPAWN */
  29
  30
  31 /*
  32  * Process structure...
  33  */
  34
  35 typedef struct
  36 {
  37   int   pid,                            /* Process ID */
  38         job_id;                         /* Job associated with process */
  39   char  name[1];                        /* Name of process */
  40 } cupsd_proc_t;
  41
  42
  43 /*
  44  * Local globals...
  45  */
  46
  47 static cups_array_t     *process_array = NULL;
  48
  49
  50 /*
  51  * Local functions...
  52  */
  53
  54 static int      compare_procs(cupsd_proc_t *a, cupsd_proc_t *b);
  55 #ifdef HAVE_SANDBOX_H
  56 static char     *cupsd_requote(char *dst, const char *src, size_t dstsize);
  57 #endif /* HAVE_SANDBOX_H */
  58
  59
  60 /*
  61  * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
  62  */
  63
  64 void *                                  /* O - Profile or NULL on error */
  65 cupsdCreateProfile(int job_id,          /* I - Job ID or 0 for none */
  66                    int allow_networking)/* I - Allow networking off machine? */
  67 {
  68 #ifdef HAVE_SANDBOX_H
  69   cups_file_t           *fp;            /* File pointer */
  70   char                  profile[1024],  /* File containing the profile */
  71                         bin[1024],      /* Quoted ServerBin */
  72                         cache[1024],    /* Quoted CacheDir */
  73                         domain[1024],   /* Domain socket, if any */
  74                         request[1024],  /* Quoted RequestRoot */
  75                         root[1024],     /* Quoted ServerRoot */
  76                         temp[1024];     /* Quoted TempDir */
  77   const char            *nodebug;       /* " (with no-log)" for no debug */
  78   cupsd_listener_t      *lis;           /* Current listening socket */
  79
  80
  81   if (!UseSandboxing || Sandboxing == CUPSD_SANDBOXING_OFF)
  82   {
  83    /*
  84     * Only use sandbox profiles as root...
  85     */
  86
  87     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  88
  89     return (NULL);
  90   }
  91
  92   if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
  93   {
  94     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  95     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s",
  96                     strerror(errno));
  97     return (NULL);
  98   }
  99
 100   fchown(cupsFileNumber(fp), RunUser, Group);
 101   fchmod(cupsFileNumber(fp), 0640);
 102
 103   cupsd_requote(bin, ServerBin, sizeof(bin));
 104   cupsd_requote(cache, CacheDir, sizeof(cache));
 105   cupsd_requote(request, RequestRoot, sizeof(request));
 106   cupsd_requote(root, ServerRoot, sizeof(root));
 107   cupsd_requote(temp, TempDir, sizeof(temp));
 108
 109   nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
 110
 111   cupsFilePuts(fp, "(version 1)\n");
 112   if (Sandboxing == CUPSD_SANDBOXING_STRICT)
 113     cupsFilePuts(fp, "(deny default)\n");
 114   else
 115     cupsFilePuts(fp, "(allow default)\n");
 116   if (LogLevel >= CUPSD_LOG_DEBUG)
 117     cupsFilePuts(fp, "(debug deny)\n");
 118   cupsFilePuts(fp, "(import \"system.sb\")\n");
 119   cupsFilePuts(fp, "(system-network)\n");
 120   cupsFilePuts(fp, "(allow mach-per-user-lookup)\n");
 121   cupsFilePuts(fp, "(allow ipc-posix-sem)\n");
 122   cupsFilePuts(fp, "(allow ipc-posix-shm)\n");
 123   cupsFilePuts(fp, "(allow ipc-sysv-shm)\n");
 124   cupsFilePuts(fp, "(allow mach-lookup)\n");
 125   cupsFilePrintf(fp,
 126                  "(deny file-write* file-read-data file-read-metadata\n"
 127                  "  (regex"
 128                  " #\"^%s$\""           /* RequestRoot */
 129                  " #\"^%s/\""           /* RequestRoot/... */
 130                  ")%s)\n",
 131                  request, request, nodebug);
 132   if (!RunUser)
 133     cupsFilePrintf(fp,
 134                    "(deny file-write* file-read-data file-read-metadata\n"
 135                    "  (regex"
 136                    " #\"^/Users$\""
 137                    " #\"^/Users/\""
 138                    ")%s)\n", nodebug);
 139   cupsFilePrintf(fp,
 140                  "(deny file-write*\n"
 141                  "  (regex"
 142                  " #\"^%s$\""           /* ServerRoot */
 143                  " #\"^%s/\""           /* ServerRoot/... */
 144                  " #\"^/private/etc$\""
 145                  " #\"^/private/etc/\""
 146                  " #\"^/usr/local/etc$\""
 147                  " #\"^/usr/local/etc/\""
 148                  " #\"^/Library$\""
 149                  " #\"^/Library/\""
 150                  " #\"^/System$\""
 151                  " #\"^/System/\""
 152                  ")%s)\n",
 153                  root, root, nodebug);
 154   /* Specifically allow applications to stat RequestRoot and some other system folders */
 155   cupsFilePrintf(fp,
 156                  "(allow file-read-metadata\n"
 157                  "  (regex"
 158                  " #\"^/$\""            /* / */
 159                  " #\"^/usr$\""         /* /usr */
 160                  " #\"^/Library$\""     /* /Library */
 161                  " #\"^/Library/Printers$\""    /* /Library/Printers */
 162                  " #\"^%s$\""           /* RequestRoot */
 163                  "))\n",
 164                  request);
 165   /* Read and write TempDir, CacheDir, and other common folders */
 166   cupsFilePrintf(fp,
 167                  "(allow file-write* file-read-data file-read-metadata\n"
 168                  "  (regex"
 169                  " #\"^%s$\""           /* TempDir */
 170                  " #\"^%s/\""           /* TempDir/... */
 171                  " #\"^%s$\""           /* CacheDir */
 172                  " #\"^%s/\""           /* CacheDir/... */
 173                  " #\"^/private/var/db/\""
 174                  " #\"^/private/var/folders/\""
 175                  " #\"^/private/var/run/\""
 176                  " #\"^/Library/Application Support/\""
 177                  " #\"^/Library/Caches/\""
 178                  " #\"^/Library/Preferences/\""
 179                  " #\"^/Users/Shared/\""
 180                  "))\n",
 181                  temp, temp, cache, cache);
 182   /* Read common folders */
 183   cupsFilePrintf(fp,
 184                  "(allow file-read-data file-read-metadata\n"
 185                  "  (regex"
 186                  " #\"^/AppleInternal$\""
 187                  " #\"^/AppleInternal/\""
 188                  " #\"^/bin$\""         /* /bin */
 189                  " #\"^/bin/\""         /* /bin/... */
 190                  " #\"^/private$\""
 191                  " #\"^/private/etc$\""
 192                  " #\"^/private/etc/\""
 193                  " #\"^/private/var$\""
 194                  " #\"^/private/var/db$\""
 195                  " #\"^/private/var/folders$\""
 196                  " #\"^/private/var/spool$\""
 197                  " #\"^/usr/bin$\""     /* /usr/bin */
 198                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 199                  " #\"^/usr/libexec/cups$\""    /* /usr/libexec/cups */
 200                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 201                  " #\"^/usr/libexec/fax$\""     /* /usr/libexec/fax */
 202                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 203                  " #\"^/usr/sbin$\""    /* /usr/sbin */
 204                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 205                  " #\"^/Library/Application Support$\""
 206                  " #\"^/Library/Application Support/\""
 207                  " #\"^/Library/Caches$\""
 208                  " #\"^/Library/Fonts$\""
 209                  " #\"^/Library/Fonts/\""
 210                  " #\"^/Library/Frameworks$\""
 211                  " #\"^/Library/Frameworks/\""
 212                  " #\"^/Library/Keychains$\""
 213                  " #\"^/Library/Keychains/\""
 214                  " #\"^/Library/Printers$\""
 215                  " #\"^/Library/Printers/\""
 216                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 217                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 218                  " #\"^%s$\""           /* ServerBin */
 219                  " #\"^%s/\""           /* ServerBin/... */
 220                  " #\"^%s$\""           /* ServerRoot */
 221                  " #\"^%s/\""           /* ServerRoot/... */
 222                  "))\n",
 223                  request, request, bin, bin, root, root);
 224   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 225   {
 226     /* Limited write access to /Library/Printers/... */
 227     cupsFilePuts(fp,
 228                  "(allow file-write*\n"
 229                  "  (regex"
 230                  " #\"^/Library/Printers/.*/\""
 231                  "))\n");
 232     cupsFilePrintf(fp,
 233                    "(deny file-write*\n"
 234                    "  (regex"
 235                    " #\"^/Library/Printers/PPDs$\""
 236                    " #\"^/Library/Printers/PPDs/\""
 237                    " #\"^/Library/Printers/PPD Plugins$\""
 238                    " #\"^/Library/Printers/PPD Plugins/\""
 239                    ")%s)\n", nodebug);
 240   }
 241   /* Allow execution of child processes */
 242   cupsFilePuts(fp, "(allow process-fork)\n");
 243   cupsFilePrintf(fp,
 244                  "(allow process-exec\n"
 245                  "  (regex"
 246                  " #\"^/bin/\""         /* /bin/... */
 247                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 248                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 249                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 250                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 251                  " #\"^%s/\""           /* ServerBin/... */
 252                  " #\"^/Library/Printers/.*/\""
 253                  " #\"^/System/Library/Frameworks/Python.framework/\""
 254                  "))\n",
 255                  bin);
 256   if (RunUser && getenv("CUPS_TESTROOT"))
 257   {
 258     /* Allow source directory access in "make test" environment */
 259     char        testroot[1024];         /* Root directory of test files */
 260
 261     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 262
 263     cupsFilePrintf(fp,
 264                    "(allow file-write* file-read-data file-read-metadata\n"
 265                    "  (regex"
 266                    " #\"^%s$\""         /* CUPS_TESTROOT */
 267                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 268                    "))\n",
 269                    testroot, testroot);
 270     cupsFilePrintf(fp,
 271                    "(allow process-exec\n"
 272                    "  (regex"
 273                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 274                    "))\n",
 275                    testroot);
 276   }
 277   if (job_id)
 278   {
 279     /* Allow job filters to read the current job files... */
 280     cupsFilePrintf(fp,
 281                    "(allow file-read-data file-read-metadata\n"
 282                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 283                    request, job_id, job_id);
 284   }
 285   else
 286   {
 287     /* Allow email notifications from notifiers... */
 288     cupsFilePuts(fp,
 289                  "(allow process-exec\n"
 290                  "  (literal \"/usr/sbin/sendmail\")\n"
 291                  "  (with no-sandbox))\n");
 292   }
 293   /* Allow outbound networking to local services */
 294   cupsFilePuts(fp, "(allow network-outbound"
 295                    "\n       (regex #\"^/private/var/run/\")");
 296   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 297        lis;
 298        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 299   {
 300     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 301     {
 302       httpAddrString(&(lis->address), domain, sizeof(domain));
 303       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 304     }
 305   }
 306   if (allow_networking)
 307   {
 308     /* Allow TCP and UDP networking off the machine... */
 309     cupsFilePuts(fp, "\n       (remote tcp))\n");
 310     cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
 311     cupsFilePuts(fp, "(allow network*\n"
 312                      "       (local udp \"*:*\")\n"
 313                      "       (remote udp \"*:*\"))\n");
 314
 315     /* Also allow access to Bluetooth, USB, device files, etc. */
 316     cupsFilePuts(fp, "(allow iokit-open)\n");
 317     cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
 318                      "       (regex #\"^/dev/\"))\n");
 319     cupsFilePuts(fp, "(allow distributed-notification-post)\n");
 320   }
 321   else
 322   {
 323     /* Only allow SNMP (UDP) off the machine... */
 324     cupsFilePuts(fp, ")\n");
 325     cupsFilePuts(fp, "(allow network-outbound\n"
 326                      "       (remote udp \"*:161\"))\n");
 327     cupsFilePuts(fp, "(allow network-inbound\n"
 328                      "       (local udp \"localhost:*\"))\n");
 329   }
 330   cupsFileClose(fp);
 331
 332   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 333   return ((void *)strdup(profile));
 334
 335 #else
 336   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 337
 338   return (NULL);
 339 #endif /* HAVE_SANDBOX_H */
 340 }
 341
 342
 343 /*
 344  * 'cupsdDestroyProfile()' - Delete an execution profile.
 345  */
 346
 347 void
 348 cupsdDestroyProfile(void *profile)      /* I - Profile */
 349 {
 350   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 351                   profile ? (char *)profile : "(null)");
 352
 353 #ifdef HAVE_SANDBOX_H
 354   if (profile)
 355   {
 356     unlink((char *)profile);
 357     free(profile);
 358   }
 359 #endif /* HAVE_SANDBOX_H */
 360 }
 361
 362
 363 /*
 364  * 'cupsdEndProcess()' - End a process.
 365  */
 366
 367 int                                     /* O - 0 on success, -1 on failure */
 368 cupsdEndProcess(int pid,                /* I - Process ID */
 369                 int force)              /* I - Force child to die */
 370 {
 371   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 372                   force);
 373
 374   if (!pid)
 375     return (0);
 376
 377   if (!RunUser)
 378   {
 379    /*
 380     * When running as root, cupsd puts child processes in their own process
 381     * group.  Using "-pid" sends a signal to all processes in the group.
 382     */
 383
 384     pid = -pid;
 385   }
 386
 387   if (force)
 388     return (kill(pid, SIGKILL));
 389   else
 390     return (kill(pid, SIGTERM));
 391 }
 392
 393
 394 /*
 395  * 'cupsdFinishProcess()' - Finish a process and get its name.
 396  */
 397
 398 const char *                            /* O - Process name */
 399 cupsdFinishProcess(int    pid,          /* I - Process ID */
 400                    char   *name,        /* I - Name buffer */
 401                    size_t namelen,      /* I - Size of name buffer */
 402                    int    *job_id)      /* O - Job ID pointer or NULL */
 403 {
 404   cupsd_proc_t  key,                    /* Search key */
 405                 *proc;                  /* Matching process */
 406
 407
 408   key.pid = pid;
 409
 410   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 411   {
 412     if (job_id)
 413       *job_id = proc->job_id;
 414
 415     strlcpy(name, proc->name, namelen);
 416     cupsArrayRemove(process_array, proc);
 417     free(proc);
 418   }
 419   else
 420   {
 421     if (job_id)
 422       *job_id = 0;
 423
 424     strlcpy(name, "unknown", namelen);
 425   }
 426
 427   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFinishProcess(pid=%d, name=%p, namelen=" CUPS_LLFMT ", job_id=%p(%d)) = \"%s\"", pid, name, CUPS_LLCAST namelen, job_id, job_id ? *job_id : 0, name);
 428
 429   return (name);
 430 }
 431
 432
 433 /*
 434  * 'cupsdStartProcess()' - Start a process.
 435  */
 436
 437 int                                     /* O - Process ID or 0 */
 438 cupsdStartProcess(
 439     const char  *command,               /* I - Full path to command */
 440     char        *argv[],                /* I - Command-line arguments */
 441     char        *envp[],                /* I - Environment */
 442     int         infd,                   /* I - Standard input file descriptor */
 443     int         outfd,                  /* I - Standard output file descriptor */
 444     int         errfd,                  /* I - Standard error file descriptor */
 445     int         backfd,                 /* I - Backchannel file descriptor */
 446     int         sidefd,                 /* I - Sidechannel file descriptor */
 447     int         root,                   /* I - Run as root? */
 448     void        *profile,               /* I - Security profile to use */
 449     cupsd_job_t *job,                   /* I - Job associated with process */
 450     int         *pid)                   /* O - Process ID */
 451 {
 452   int           i;                      /* Looping var */
 453   const char    *exec_path = command;   /* Command to be exec'd */
 454   char          *real_argv[110],        /* Real command-line arguments */
 455                 cups_exec[1024];        /* Path to "cups-exec" program */
 456   uid_t         user;                   /* Command UID */
 457   cupsd_proc_t  *proc;                  /* New process record */
 458 #ifdef HAVE_POSIX_SPAWN
 459   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 460   posix_spawnattr_t attrs;              /* Spawn attributes */
 461   char          user_str[16],           /* User string */
 462                 group_str[16],          /* Group string */
 463                 nice_str[16];           /* FilterNice string */
 464 #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 465   struct sigaction action;              /* POSIX signal handler */
 466 #endif /* HAVE_POSIX_SPAWN */
 467 #if defined(__APPLE__)
 468   char          processPath[1024],      /* CFProcessPath environment variable */
 469                 linkpath[1024];         /* Link path for symlinks... */
 470   int           linkbytes;              /* Bytes for link path */
 471 #endif /* __APPLE__ */
 472
 473
 474   *pid = 0;
 475
 476  /*
 477   * Figure out the UID for the child process...
 478   */
 479
 480   if (RunUser)
 481     user = RunUser;
 482   else if (root)
 483     user = 0;
 484   else
 485     user = User;
 486
 487  /*
 488   * Check the permissions of the command we are running...
 489   */
 490
 491   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 492                      cupsdLogFCMessage, job ? job->printer : NULL))
 493     return (0);
 494
 495 #if defined(__APPLE__)
 496   if (envp)
 497   {
 498    /*
 499     * Add special voodoo magic for OS X - this allows OS X programs to access
 500     * their bundle resources properly...
 501     */
 502
 503     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 504     {
 505      /*
 506       * Yes, this is a symlink to the actual program, nul-terminate and
 507       * use it...
 508       */
 509
 510       linkpath[linkbytes] = '\0';
 511
 512       if (linkpath[0] == '/')
 513         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 514                  linkpath);
 515       else
 516         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 517                  dirname((char *)command), linkpath);
 518     }
 519     else
 520       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 521
 522     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 523   }
 524 #endif  /* __APPLE__ */
 525
 526  /*
 527   * Use helper program when we have a sandbox profile...
 528   */
 529
 530 #ifndef HAVE_POSIX_SPAWN
 531   if (profile)
 532 #endif /* !HAVE_POSIX_SPAWN */
 533   {
 534     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 535     snprintf(user_str, sizeof(user_str), "%d", user);
 536     snprintf(group_str, sizeof(group_str), "%d", Group);
 537     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 538
 539     real_argv[0] = cups_exec;
 540     real_argv[1] = (char *)"-g";
 541     real_argv[2] = group_str;
 542     real_argv[3] = (char *)"-n";
 543     real_argv[4] = nice_str;
 544     real_argv[5] = (char *)"-u";
 545     real_argv[6] = user_str;
 546     real_argv[7] = profile;
 547     real_argv[8] = (char *)command;
 548
 549     for (i = 0;
 550          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 551          i ++)
 552       real_argv[i + 9] = argv[i];
 553
 554     real_argv[i + 9] = NULL;
 555
 556     argv      = real_argv;
 557     exec_path = cups_exec;
 558   }
 559
 560   if (LogLevel == CUPSD_LOG_DEBUG2)
 561   {
 562     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 563
 564     for (i = 0; argv[i]; i ++)
 565       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 566   }
 567
 568 #ifdef HAVE_POSIX_SPAWN
 569  /*
 570   * Setup attributes and file actions for the spawn...
 571   */
 572
 573   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 574   posix_spawnattr_init(&attrs);
 575   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 576
 577   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 578   posix_spawn_file_actions_init(&actions);
 579   if (infd != 0)
 580   {
 581     if (infd < 0)
 582       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 583     else
 584       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 585   }
 586
 587   if (outfd != 1)
 588   {
 589     if (outfd < 0)
 590       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 591     else
 592       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 593   }
 594
 595   if (errfd != 2)
 596   {
 597     if (errfd < 0)
 598       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 599     else
 600       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 601   }
 602
 603   if (backfd != 3 && backfd >= 0)
 604     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 605
 606   if (sidefd != 4 && sidefd >= 0)
 607     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 608
 609   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 610
 611   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 612   {
 613     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 614
 615     *pid = 0;
 616   }
 617   else
 618     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 619
 620   posix_spawn_file_actions_destroy(&actions);
 621   posix_spawnattr_destroy(&attrs);
 622
 623 #else
 624  /*
 625   * Block signals before forking...
 626   */
 627
 628   cupsdHoldSignals();
 629
 630   if ((*pid = fork()) == 0)
 631   {
 632    /*
 633     * Child process goes here; update stderr as needed...
 634     */
 635
 636     if (errfd != 2)
 637     {
 638       if (errfd < 0)
 639         errfd = open("/dev/null", O_WRONLY);
 640
 641       if (errfd != 2)
 642       {
 643         dup2(errfd, 2);
 644         close(errfd);
 645       }
 646     }
 647
 648    /*
 649     * Put this process in its own process group so that we can kill any child
 650     * processes it creates.
 651     */
 652
 653 #  ifdef HAVE_SETPGID
 654     if (!RunUser && setpgid(0, 0))
 655       exit(errno + 100);
 656 #  else
 657     if (!RunUser && setpgrp())
 658       exit(errno + 100);
 659 #  endif /* HAVE_SETPGID */
 660
 661    /*
 662     * Update the remaining file descriptors as needed...
 663     */
 664
 665     if (infd != 0)
 666     {
 667       if (infd < 0)
 668         infd = open("/dev/null", O_RDONLY);
 669
 670       if (infd != 0)
 671       {
 672         dup2(infd, 0);
 673         close(infd);
 674       }
 675     }
 676
 677     if (outfd != 1)
 678     {
 679       if (outfd < 0)
 680         outfd = open("/dev/null", O_WRONLY);
 681
 682       if (outfd != 1)
 683       {
 684         dup2(outfd, 1);
 685         close(outfd);
 686       }
 687     }
 688
 689     if (backfd != 3 && backfd >= 0)
 690     {
 691       dup2(backfd, 3);
 692       close(backfd);
 693       fcntl(3, F_SETFL, O_NDELAY);
 694     }
 695
 696     if (sidefd != 4 && sidefd >= 0)
 697     {
 698       dup2(sidefd, 4);
 699       close(sidefd);
 700       fcntl(4, F_SETFL, O_NDELAY);
 701     }
 702
 703    /*
 704     * Change the priority of the process based on the FilterNice setting.
 705     * (this is not done for root processes...)
 706     */
 707
 708     if (!root)
 709       nice(FilterNice);
 710
 711    /*
 712     * Reset group membership to just the main one we belong to.
 713     */
 714
 715     if (!RunUser && setgid(Group))
 716       exit(errno + 100);
 717
 718     if (!RunUser && setgroups(1, &Group))
 719       exit(errno + 100);
 720
 721    /*
 722     * Change user to something "safe"...
 723     */
 724
 725     if (!RunUser && user && setuid(user))
 726       exit(errno + 100);
 727
 728    /*
 729     * Change umask to restrict permissions on created files...
 730     */
 731
 732     umask(077);
 733
 734    /*
 735     * Unblock signals before doing the exec...
 736     */
 737
 738 #  ifdef HAVE_SIGSET
 739     sigset(SIGTERM, SIG_DFL);
 740     sigset(SIGCHLD, SIG_DFL);
 741     sigset(SIGPIPE, SIG_DFL);
 742 #  elif defined(HAVE_SIGACTION)
 743     memset(&action, 0, sizeof(action));
 744
 745     sigemptyset(&action.sa_mask);
 746     action.sa_handler = SIG_DFL;
 747
 748     sigaction(SIGTERM, &action, NULL);
 749     sigaction(SIGCHLD, &action, NULL);
 750     sigaction(SIGPIPE, &action, NULL);
 751 #  else
 752     signal(SIGTERM, SIG_DFL);
 753     signal(SIGCHLD, SIG_DFL);
 754     signal(SIGPIPE, SIG_DFL);
 755 #  endif /* HAVE_SIGSET */
 756
 757     cupsdReleaseSignals();
 758
 759    /*
 760     * Execute the command; if for some reason this doesn't work, log an error
 761     * exit with a non-zero value...
 762     */
 763
 764     if (envp)
 765       execve(exec_path, argv, envp);
 766     else
 767       execv(exec_path, argv);
 768
 769     exit(errno + 100);
 770   }
 771   else if (*pid < 0)
 772   {
 773    /*
 774     * Error - couldn't fork a new process!
 775     */
 776
 777     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 778                     strerror(errno));
 779
 780     *pid = 0;
 781   }
 782
 783   cupsdReleaseSignals();
 784 #endif /* HAVE_POSIX_SPAWN */
 785
 786   if (*pid)
 787   {
 788     if (!process_array)
 789       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 790
 791     if (process_array)
 792     {
 793       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 794       {
 795         proc->pid    = *pid;
 796         proc->job_id = job ? job->id : 0;
 797         _cups_strcpy(proc->name, command);
 798
 799         cupsArrayAdd(process_array, proc);
 800       }
 801     }
 802   }
 803
 804   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 805                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 806                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 807                   "profile=%p, job=%p(%d), pid=%p) = %d",
 808                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 809                   root, profile, job, job ? job->id : 0, pid, *pid);
 810
 811   return (*pid);
 812 }
 813
 814
 815 /*
 816  * 'compare_procs()' - Compare two processes.
 817  */
 818
 819 static int                              /* O - Result of comparison */
 820 compare_procs(cupsd_proc_t *a,          /* I - First process */
 821               cupsd_proc_t *b)          /* I - Second process */
 822 {
 823   return (a->pid - b->pid);
 824 }
 825
 826
 827 #ifdef HAVE_SANDBOX_H
 828 /*
 829  * 'cupsd_requote()' - Make a regular-expression version of a string.
 830  */
 831
 832 static char *                           /* O - Quoted string */
 833 cupsd_requote(char       *dst,          /* I - Destination buffer */
 834               const char *src,          /* I - Source string */
 835               size_t     dstsize)       /* I - Size of destination buffer */
 836 {
 837   int   ch;                             /* Current character */
 838   char  *dstptr,                        /* Current position in buffer */
 839         *dstend;                        /* End of destination buffer */
 840
 841
 842   dstptr = dst;
 843   dstend = dst + dstsize - 2;
 844
 845   while (*src && dstptr < dstend)
 846   {
 847     ch = *src++;
 848
 849     if (ch == '/' && !*src)
 850       break;                            /* Don't add trailing slash */
 851
 852     if (strchr(".?*()[]^$\\", ch))
 853       *dstptr++ = '\\';
 854
 855     *dstptr++ = (char)ch;
 856   }
 857
 858   *dstptr = '\0';
 859
 860   return (dst);
 861 }
 862 #endif /* HAVE_SANDBOX_H */
 863
 864
 865 /*
 866  * End of "$Id$".
 867  */