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/sbin$\""    /* /usr/sbin */
 202                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 203                  " #\"^/Library/Caches$\""
 204                  " #\"^/Library/Fonts$\""
 205                  " #\"^/Library/Fonts/\""
 206                  " #\"^/Library/Frameworks$\""
 207                  " #\"^/Library/Frameworks/\""
 208                  " #\"^/Library/Keychains$\""
 209                  " #\"^/Library/Keychains/\""
 210                  " #\"^/Library/Printers$\""
 211                  " #\"^/Library/Printers/\""
 212                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 213                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 214                  " #\"^%s$\""           /* ServerBin */
 215                  " #\"^%s/\""           /* ServerBin/... */
 216                  " #\"^%s$\""           /* ServerRoot */
 217                  " #\"^%s/\""           /* ServerRoot/... */
 218                  "))\n",
 219                  request, request, bin, bin, root, root);
 220   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 221   {
 222     /* Limited write access to /Library/Printers/... */
 223     cupsFilePuts(fp,
 224                  "(allow file-write*\n"
 225                  "  (regex"
 226                  " #\"^/Library/Printers/.*/\""
 227                  "))\n");
 228     cupsFilePrintf(fp,
 229                    "(deny file-write*\n"
 230                    "  (regex"
 231                    " #\"^/Library/Printers/PPDs$\""
 232                    " #\"^/Library/Printers/PPDs/\""
 233                    " #\"^/Library/Printers/PPD Plugins$\""
 234                    " #\"^/Library/Printers/PPD Plugins/\""
 235                    ")%s)\n", nodebug);
 236   }
 237   /* Allow execution of child processes */
 238   cupsFilePuts(fp, "(allow process-fork)\n");
 239   cupsFilePrintf(fp,
 240                  "(allow process-exec\n"
 241                  "  (regex"
 242                  " #\"^/bin/\""         /* /bin/... */
 243                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 244                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 245                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 246                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 247                  " #\"^%s/\""           /* ServerBin/... */
 248                  " #\"^/Library/Printers/.*/\""
 249                  "))\n",
 250                  bin);
 251   if (RunUser && getenv("CUPS_TESTROOT"))
 252   {
 253     /* Allow source directory access in "make test" environment */
 254     char        testroot[1024];         /* Root directory of test files */
 255
 256     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 257
 258     cupsFilePrintf(fp,
 259                    "(allow file-write* file-read-data file-read-metadata\n"
 260                    "  (regex"
 261                    " #\"^%s$\""         /* CUPS_TESTROOT */
 262                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 263                    "))\n",
 264                    testroot, testroot);
 265     cupsFilePrintf(fp,
 266                    "(allow process-exec\n"
 267                    "  (regex"
 268                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 269                    "))\n",
 270                    testroot);
 271   }
 272   if (job_id)
 273   {
 274     /* Allow job filters to read the current job files... */
 275     cupsFilePrintf(fp,
 276                    "(allow file-read-data file-read-metadata\n"
 277                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 278                    request, job_id, job_id);
 279   }
 280   else
 281   {
 282     /* Allow email notifications from notifiers... */
 283     cupsFilePuts(fp,
 284                  "(allow process-exec\n"
 285                  "  (literal \"/usr/sbin/sendmail\")\n"
 286                  "  (with no-sandbox))\n");
 287   }
 288   /* Allow outbound networking to local services */
 289   cupsFilePuts(fp, "(allow network-outbound"
 290                    "\n       (regex #\"^/private/var/run/\")");
 291   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 292        lis;
 293        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 294   {
 295     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 296     {
 297       httpAddrString(&(lis->address), domain, sizeof(domain));
 298       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 299     }
 300   }
 301   if (allow_networking)
 302   {
 303     /* Allow TCP and UDP networking off the machine... */
 304     cupsFilePuts(fp, "\n       (remote tcp))\n");
 305     cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
 306     cupsFilePuts(fp, "(allow network*\n"
 307                      "       (local udp \"*:*\")\n"
 308                      "       (remote udp \"*:*\"))\n");
 309
 310     /* Also allow access to Bluetooth, USB, device files, etc. */
 311     cupsFilePuts(fp, "(allow iokit-open)\n");
 312     cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
 313                      "       (regex #\"^/dev/\"))\n");
 314     cupsFilePuts(fp, "(allow distributed-notification-post)\n");
 315   }
 316   else
 317   {
 318     /* Only allow SNMP (UDP) off the machine... */
 319     cupsFilePuts(fp, ")\n");
 320     cupsFilePuts(fp, "(allow network-outbound\n"
 321                      "       (remote udp \"*:161\"))\n");
 322     cupsFilePuts(fp, "(allow network-inbound\n"
 323                      "       (local udp \"localhost:*\"))\n");
 324   }
 325   cupsFileClose(fp);
 326
 327   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 328   return ((void *)strdup(profile));
 329
 330 #else
 331   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 332
 333   return (NULL);
 334 #endif /* HAVE_SANDBOX_H */
 335 }
 336
 337
 338 /*
 339  * 'cupsdDestroyProfile()' - Delete an execution profile.
 340  */
 341
 342 void
 343 cupsdDestroyProfile(void *profile)      /* I - Profile */
 344 {
 345   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 346                   profile ? (char *)profile : "(null)");
 347
 348 #ifdef HAVE_SANDBOX_H
 349   if (profile)
 350   {
 351     unlink((char *)profile);
 352     free(profile);
 353   }
 354 #endif /* HAVE_SANDBOX_H */
 355 }
 356
 357
 358 /*
 359  * 'cupsdEndProcess()' - End a process.
 360  */
 361
 362 int                                     /* O - 0 on success, -1 on failure */
 363 cupsdEndProcess(int pid,                /* I - Process ID */
 364                 int force)              /* I - Force child to die */
 365 {
 366   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 367                   force);
 368
 369   if (!pid)
 370     return (0);
 371
 372   if (!RunUser)
 373   {
 374    /*
 375     * When running as root, cupsd puts child processes in their own process
 376     * group.  Using "-pid" sends a signal to all processes in the group.
 377     */
 378
 379     pid = -pid;
 380   }
 381
 382   if (force)
 383     return (kill(pid, SIGKILL));
 384   else
 385     return (kill(pid, SIGTERM));
 386 }
 387
 388
 389 /*
 390  * 'cupsdFinishProcess()' - Finish a process and get its name.
 391  */
 392
 393 const char *                            /* O - Process name */
 394 cupsdFinishProcess(int    pid,          /* I - Process ID */
 395                    char   *name,        /* I - Name buffer */
 396                    size_t namelen,      /* I - Size of name buffer */
 397                    int    *job_id)      /* O - Job ID pointer or NULL */
 398 {
 399   cupsd_proc_t  key,                    /* Search key */
 400                 *proc;                  /* Matching process */
 401
 402
 403   key.pid = pid;
 404
 405   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 406   {
 407     if (job_id)
 408       *job_id = proc->job_id;
 409
 410     strlcpy(name, proc->name, namelen);
 411     cupsArrayRemove(process_array, proc);
 412     free(proc);
 413   }
 414   else
 415   {
 416     if (job_id)
 417       *job_id = 0;
 418
 419     strlcpy(name, "unknown", namelen);
 420   }
 421
 422   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);
 423
 424   return (name);
 425 }
 426
 427
 428 /*
 429  * 'cupsdStartProcess()' - Start a process.
 430  */
 431
 432 int                                     /* O - Process ID or 0 */
 433 cupsdStartProcess(
 434     const char  *command,               /* I - Full path to command */
 435     char        *argv[],                /* I - Command-line arguments */
 436     char        *envp[],                /* I - Environment */
 437     int         infd,                   /* I - Standard input file descriptor */
 438     int         outfd,                  /* I - Standard output file descriptor */
 439     int         errfd,                  /* I - Standard error file descriptor */
 440     int         backfd,                 /* I - Backchannel file descriptor */
 441     int         sidefd,                 /* I - Sidechannel file descriptor */
 442     int         root,                   /* I - Run as root? */
 443     void        *profile,               /* I - Security profile to use */
 444     cupsd_job_t *job,                   /* I - Job associated with process */
 445     int         *pid)                   /* O - Process ID */
 446 {
 447   int           i;                      /* Looping var */
 448   const char    *exec_path = command;   /* Command to be exec'd */
 449   char          *real_argv[110],        /* Real command-line arguments */
 450                 cups_exec[1024];        /* Path to "cups-exec" program */
 451   uid_t         user;                   /* Command UID */
 452   cupsd_proc_t  *proc;                  /* New process record */
 453 #ifdef HAVE_POSIX_SPAWN
 454   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 455   posix_spawnattr_t attrs;              /* Spawn attributes */
 456   char          user_str[16],           /* User string */
 457                 group_str[16],          /* Group string */
 458                 nice_str[16];           /* FilterNice string */
 459 #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 460   struct sigaction action;              /* POSIX signal handler */
 461 #endif /* HAVE_POSIX_SPAWN */
 462 #if defined(__APPLE__)
 463   char          processPath[1024],      /* CFProcessPath environment variable */
 464                 linkpath[1024];         /* Link path for symlinks... */
 465   int           linkbytes;              /* Bytes for link path */
 466 #endif /* __APPLE__ */
 467
 468
 469   *pid = 0;
 470
 471  /*
 472   * Figure out the UID for the child process...
 473   */
 474
 475   if (RunUser)
 476     user = RunUser;
 477   else if (root)
 478     user = 0;
 479   else
 480     user = User;
 481
 482  /*
 483   * Check the permissions of the command we are running...
 484   */
 485
 486   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 487                      cupsdLogFCMessage, job ? job->printer : NULL))
 488     return (0);
 489
 490 #if defined(__APPLE__)
 491   if (envp)
 492   {
 493    /*
 494     * Add special voodoo magic for OS X - this allows OS X programs to access
 495     * their bundle resources properly...
 496     */
 497
 498     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 499     {
 500      /*
 501       * Yes, this is a symlink to the actual program, nul-terminate and
 502       * use it...
 503       */
 504
 505       linkpath[linkbytes] = '\0';
 506
 507       if (linkpath[0] == '/')
 508         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 509                  linkpath);
 510       else
 511         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 512                  dirname((char *)command), linkpath);
 513     }
 514     else
 515       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 516
 517     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 518   }
 519 #endif  /* __APPLE__ */
 520
 521  /*
 522   * Use helper program when we have a sandbox profile...
 523   */
 524
 525 #ifndef HAVE_POSIX_SPAWN
 526   if (profile)
 527 #endif /* !HAVE_POSIX_SPAWN */
 528   {
 529     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 530     snprintf(user_str, sizeof(user_str), "%d", user);
 531     snprintf(group_str, sizeof(group_str), "%d", Group);
 532     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 533
 534     real_argv[0] = cups_exec;
 535     real_argv[1] = (char *)"-g";
 536     real_argv[2] = group_str;
 537     real_argv[3] = (char *)"-n";
 538     real_argv[4] = nice_str;
 539     real_argv[5] = (char *)"-u";
 540     real_argv[6] = user_str;
 541     real_argv[7] = profile;
 542     real_argv[8] = (char *)command;
 543
 544     for (i = 0;
 545          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 546          i ++)
 547       real_argv[i + 9] = argv[i];
 548
 549     real_argv[i + 9] = NULL;
 550
 551     argv      = real_argv;
 552     exec_path = cups_exec;
 553   }
 554
 555   if (LogLevel == CUPSD_LOG_DEBUG2)
 556   {
 557     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 558
 559     for (i = 0; argv[i]; i ++)
 560       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 561   }
 562
 563 #ifdef HAVE_POSIX_SPAWN
 564  /*
 565   * Setup attributes and file actions for the spawn...
 566   */
 567
 568   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 569   posix_spawnattr_init(&attrs);
 570   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 571
 572   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 573   posix_spawn_file_actions_init(&actions);
 574   if (infd != 0)
 575   {
 576     if (infd < 0)
 577       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 578     else
 579       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 580   }
 581
 582   if (outfd != 1)
 583   {
 584     if (outfd < 0)
 585       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 586     else
 587       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 588   }
 589
 590   if (errfd != 2)
 591   {
 592     if (errfd < 0)
 593       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 594     else
 595       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 596   }
 597
 598   if (backfd != 3 && backfd >= 0)
 599     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 600
 601   if (sidefd != 4 && sidefd >= 0)
 602     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 603
 604   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 605
 606   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 607   {
 608     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 609
 610     *pid = 0;
 611   }
 612   else
 613     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 614
 615   posix_spawn_file_actions_destroy(&actions);
 616   posix_spawnattr_destroy(&attrs);
 617
 618 #else
 619  /*
 620   * Block signals before forking...
 621   */
 622
 623   cupsdHoldSignals();
 624
 625   if ((*pid = fork()) == 0)
 626   {
 627    /*
 628     * Child process goes here; update stderr as needed...
 629     */
 630
 631     if (errfd != 2)
 632     {
 633       if (errfd < 0)
 634         errfd = open("/dev/null", O_WRONLY);
 635
 636       if (errfd != 2)
 637       {
 638         dup2(errfd, 2);
 639         close(errfd);
 640       }
 641     }
 642
 643    /*
 644     * Put this process in its own process group so that we can kill any child
 645     * processes it creates.
 646     */
 647
 648 #  ifdef HAVE_SETPGID
 649     if (!RunUser && setpgid(0, 0))
 650       exit(errno + 100);
 651 #  else
 652     if (!RunUser && setpgrp())
 653       exit(errno + 100);
 654 #  endif /* HAVE_SETPGID */
 655
 656    /*
 657     * Update the remaining file descriptors as needed...
 658     */
 659
 660     if (infd != 0)
 661     {
 662       if (infd < 0)
 663         infd = open("/dev/null", O_RDONLY);
 664
 665       if (infd != 0)
 666       {
 667         dup2(infd, 0);
 668         close(infd);
 669       }
 670     }
 671
 672     if (outfd != 1)
 673     {
 674       if (outfd < 0)
 675         outfd = open("/dev/null", O_WRONLY);
 676
 677       if (outfd != 1)
 678       {
 679         dup2(outfd, 1);
 680         close(outfd);
 681       }
 682     }
 683
 684     if (backfd != 3 && backfd >= 0)
 685     {
 686       dup2(backfd, 3);
 687       close(backfd);
 688       fcntl(3, F_SETFL, O_NDELAY);
 689     }
 690
 691     if (sidefd != 4 && sidefd >= 0)
 692     {
 693       dup2(sidefd, 4);
 694       close(sidefd);
 695       fcntl(4, F_SETFL, O_NDELAY);
 696     }
 697
 698    /*
 699     * Change the priority of the process based on the FilterNice setting.
 700     * (this is not done for root processes...)
 701     */
 702
 703     if (!root)
 704       nice(FilterNice);
 705
 706    /*
 707     * Reset group membership to just the main one we belong to.
 708     */
 709
 710     if (!RunUser && setgid(Group))
 711       exit(errno + 100);
 712
 713     if (!RunUser && setgroups(1, &Group))
 714       exit(errno + 100);
 715
 716    /*
 717     * Change user to something "safe"...
 718     */
 719
 720     if (!RunUser && user && setuid(user))
 721       exit(errno + 100);
 722
 723    /*
 724     * Change umask to restrict permissions on created files...
 725     */
 726
 727     umask(077);
 728
 729    /*
 730     * Unblock signals before doing the exec...
 731     */
 732
 733 #  ifdef HAVE_SIGSET
 734     sigset(SIGTERM, SIG_DFL);
 735     sigset(SIGCHLD, SIG_DFL);
 736     sigset(SIGPIPE, SIG_DFL);
 737 #  elif defined(HAVE_SIGACTION)
 738     memset(&action, 0, sizeof(action));
 739
 740     sigemptyset(&action.sa_mask);
 741     action.sa_handler = SIG_DFL;
 742
 743     sigaction(SIGTERM, &action, NULL);
 744     sigaction(SIGCHLD, &action, NULL);
 745     sigaction(SIGPIPE, &action, NULL);
 746 #  else
 747     signal(SIGTERM, SIG_DFL);
 748     signal(SIGCHLD, SIG_DFL);
 749     signal(SIGPIPE, SIG_DFL);
 750 #  endif /* HAVE_SIGSET */
 751
 752     cupsdReleaseSignals();
 753
 754    /*
 755     * Execute the command; if for some reason this doesn't work, log an error
 756     * exit with a non-zero value...
 757     */
 758
 759     if (envp)
 760       execve(exec_path, argv, envp);
 761     else
 762       execv(exec_path, argv);
 763
 764     exit(errno + 100);
 765   }
 766   else if (*pid < 0)
 767   {
 768    /*
 769     * Error - couldn't fork a new process!
 770     */
 771
 772     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 773                     strerror(errno));
 774
 775     *pid = 0;
 776   }
 777
 778   cupsdReleaseSignals();
 779 #endif /* HAVE_POSIX_SPAWN */
 780
 781   if (*pid)
 782   {
 783     if (!process_array)
 784       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 785
 786     if (process_array)
 787     {
 788       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 789       {
 790         proc->pid    = *pid;
 791         proc->job_id = job ? job->id : 0;
 792         _cups_strcpy(proc->name, command);
 793
 794         cupsArrayAdd(process_array, proc);
 795       }
 796     }
 797   }
 798
 799   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 800                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 801                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 802                   "profile=%p, job=%p(%d), pid=%p) = %d",
 803                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 804                   root, profile, job, job ? job->id : 0, pid, *pid);
 805
 806   return (*pid);
 807 }
 808
 809
 810 /*
 811  * 'compare_procs()' - Compare two processes.
 812  */
 813
 814 static int                              /* O - Result of comparison */
 815 compare_procs(cupsd_proc_t *a,          /* I - First process */
 816               cupsd_proc_t *b)          /* I - Second process */
 817 {
 818   return (a->pid - b->pid);
 819 }
 820
 821
 822 #ifdef HAVE_SANDBOX_H
 823 /*
 824  * 'cupsd_requote()' - Make a regular-expression version of a string.
 825  */
 826
 827 static char *                           /* O - Quoted string */
 828 cupsd_requote(char       *dst,          /* I - Destination buffer */
 829               const char *src,          /* I - Source string */
 830               size_t     dstsize)       /* I - Size of destination buffer */
 831 {
 832   int   ch;                             /* Current character */
 833   char  *dstptr,                        /* Current position in buffer */
 834         *dstend;                        /* End of destination buffer */
 835
 836
 837   dstptr = dst;
 838   dstend = dst + dstsize - 2;
 839
 840   while (*src && dstptr < dstend)
 841   {
 842     ch = *src++;
 843
 844     if (ch == '/' && !*src)
 845       break;                            /* Don't add trailing slash */
 846
 847     if (strchr(".?*()[]^$\\", ch))
 848       *dstptr++ = '\\';
 849
 850     *dstptr++ = (char)ch;
 851   }
 852
 853   *dstptr = '\0';
 854
 855   return (dst);
 856 }
 857 #endif /* HAVE_SANDBOX_H */
 858
 859
 860 /*
 861  * End of "$Id$".
 862  */