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/tmp$\""
 194                  " #\"^/private/tmp/\""
 195                  " #\"^/private/var$\""
 196                  " #\"^/private/var/db$\""
 197                  " #\"^/private/var/folders$\""
 198                  " #\"^/private/var/run$\""
 199                  " #\"^/private/var/run/\""
 200                  " #\"^/private/var/spool$\""
 201                  " #\"^/usr/bin$\""     /* /usr/bin */
 202                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 203                  " #\"^/usr/libexec/cups$\""    /* /usr/libexec/cups */
 204                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 205                  " #\"^/usr/libexec/fax$\""     /* /usr/libexec/fax */
 206                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 207                  " #\"^/usr/sbin$\""    /* /usr/sbin */
 208                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 209                  " #\"^/Library/Application Support$\""
 210                  " #\"^/Library/Application Support/\""
 211                  " #\"^/Library/Caches$\""
 212                  " #\"^/Library/Fonts$\""
 213                  " #\"^/Library/Fonts/\""
 214                  " #\"^/Library/Frameworks$\""
 215                  " #\"^/Library/Frameworks/\""
 216                  " #\"^/Library/Keychains$\""
 217                  " #\"^/Library/Keychains/\""
 218                  " #\"^/Library/Printers$\""
 219                  " #\"^/Library/Printers/\""
 220                  " #\"^/Library/Security$\""
 221                  " #\"^/Library/Security/\""
 222                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 223                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 224                  " #\"^%s$\""           /* ServerBin */
 225                  " #\"^%s/\""           /* ServerBin/... */
 226                  " #\"^%s$\""           /* ServerRoot */
 227                  " #\"^%s/\""           /* ServerRoot/... */
 228                  "))\n",
 229                  request, request, bin, bin, root, root);
 230   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 231   {
 232     /* Limited write access to /Library/Printers/... */
 233     cupsFilePuts(fp,
 234                  "(allow file-write*\n"
 235                  "  (regex"
 236                  " #\"^/Library/Printers/.*/\""
 237                  "))\n");
 238     cupsFilePrintf(fp,
 239                    "(deny file-write*\n"
 240                    "  (regex"
 241                    " #\"^/Library/Printers/PPDs$\""
 242                    " #\"^/Library/Printers/PPDs/\""
 243                    " #\"^/Library/Printers/PPD Plugins$\""
 244                    " #\"^/Library/Printers/PPD Plugins/\""
 245                    ")%s)\n", nodebug);
 246   }
 247   /* Allow execution of child processes */
 248   cupsFilePuts(fp, "(allow process-fork)\n");
 249   cupsFilePrintf(fp,
 250                  "(allow process-exec\n"
 251                  "  (regex"
 252                  " #\"^/bin/\""         /* /bin/... */
 253                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 254                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 255                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 256                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 257                  " #\"^%s/\""           /* ServerBin/... */
 258                  " #\"^/Library/Printers/.*/\""
 259                  " #\"^/System/Library/Frameworks/Python.framework/\""
 260                  "))\n",
 261                  bin);
 262   if (RunUser && getenv("CUPS_TESTROOT"))
 263   {
 264     /* Allow source directory access in "make test" environment */
 265     char        testroot[1024];         /* Root directory of test files */
 266
 267     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 268
 269     cupsFilePrintf(fp,
 270                    "(allow file-write* file-read-data file-read-metadata\n"
 271                    "  (regex"
 272                    " #\"^%s$\""         /* CUPS_TESTROOT */
 273                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 274                    "))\n",
 275                    testroot, testroot);
 276     cupsFilePrintf(fp,
 277                    "(allow process-exec\n"
 278                    "  (regex"
 279                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 280                    "))\n",
 281                    testroot);
 282   }
 283   if (job_id)
 284   {
 285     /* Allow job filters to read the current job files... */
 286     cupsFilePrintf(fp,
 287                    "(allow file-read-data file-read-metadata\n"
 288                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 289                    request, job_id, job_id);
 290   }
 291   else
 292   {
 293     /* Allow email notifications from notifiers... */
 294     cupsFilePuts(fp,
 295                  "(allow process-exec\n"
 296                  "  (literal \"/usr/sbin/sendmail\")\n"
 297                  "  (with no-sandbox))\n");
 298   }
 299   /* Allow outbound networking to local services */
 300   cupsFilePuts(fp, "(allow network-outbound"
 301                    "\n       (regex #\"^/private/var/run/\" #\"^/private/tmp/\")");
 302   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 303        lis;
 304        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 305   {
 306     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 307     {
 308       httpAddrString(&(lis->address), domain, sizeof(domain));
 309       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 310     }
 311   }
 312   if (allow_networking)
 313   {
 314     /* Allow TCP and UDP networking off the machine... */
 315     cupsFilePuts(fp, "\n       (remote tcp))\n");
 316     cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
 317     cupsFilePuts(fp, "(allow network*\n"
 318                      "       (local udp \"*:*\")\n"
 319                      "       (remote udp \"*:*\"))\n");
 320
 321     /* Also allow access to Bluetooth, USB, device files, etc. */
 322     cupsFilePuts(fp, "(allow iokit*)\n");
 323     cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
 324                      "       (regex #\"^/dev/\"))\n");
 325     cupsFilePuts(fp, "(allow distributed-notification-post)\n");
 326   }
 327   else
 328   {
 329     /* Only allow SNMP (UDP) off the machine... */
 330     cupsFilePuts(fp, ")\n");
 331     cupsFilePuts(fp, "(allow network-outbound\n"
 332                      "       (remote udp \"*:161\"))\n");
 333     cupsFilePuts(fp, "(allow network-inbound\n"
 334                      "       (local udp \"localhost:*\"))\n");
 335     cupsFilePuts(fp, "(deny iokit* (with no-report))\n");
 336   }
 337   cupsFileClose(fp);
 338
 339   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 340   return ((void *)strdup(profile));
 341
 342 #else
 343   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 344
 345   return (NULL);
 346 #endif /* HAVE_SANDBOX_H */
 347 }
 348
 349
 350 /*
 351  * 'cupsdDestroyProfile()' - Delete an execution profile.
 352  */
 353
 354 void
 355 cupsdDestroyProfile(void *profile)      /* I - Profile */
 356 {
 357   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 358                   profile ? (char *)profile : "(null)");
 359
 360 #ifdef HAVE_SANDBOX_H
 361   if (profile)
 362   {
 363     unlink((char *)profile);
 364     free(profile);
 365   }
 366 #endif /* HAVE_SANDBOX_H */
 367 }
 368
 369
 370 /*
 371  * 'cupsdEndProcess()' - End a process.
 372  */
 373
 374 int                                     /* O - 0 on success, -1 on failure */
 375 cupsdEndProcess(int pid,                /* I - Process ID */
 376                 int force)              /* I - Force child to die */
 377 {
 378   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 379                   force);
 380
 381   if (!pid)
 382     return (0);
 383
 384   if (!RunUser)
 385   {
 386    /*
 387     * When running as root, cupsd puts child processes in their own process
 388     * group.  Using "-pid" sends a signal to all processes in the group.
 389     */
 390
 391     pid = -pid;
 392   }
 393
 394   if (force)
 395     return (kill(pid, SIGKILL));
 396   else
 397     return (kill(pid, SIGTERM));
 398 }
 399
 400
 401 /*
 402  * 'cupsdFinishProcess()' - Finish a process and get its name.
 403  */
 404
 405 const char *                            /* O - Process name */
 406 cupsdFinishProcess(int    pid,          /* I - Process ID */
 407                    char   *name,        /* I - Name buffer */
 408                    size_t namelen,      /* I - Size of name buffer */
 409                    int    *job_id)      /* O - Job ID pointer or NULL */
 410 {
 411   cupsd_proc_t  key,                    /* Search key */
 412                 *proc;                  /* Matching process */
 413
 414
 415   key.pid = pid;
 416
 417   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 418   {
 419     if (job_id)
 420       *job_id = proc->job_id;
 421
 422     strlcpy(name, proc->name, namelen);
 423     cupsArrayRemove(process_array, proc);
 424     free(proc);
 425   }
 426   else
 427   {
 428     if (job_id)
 429       *job_id = 0;
 430
 431     strlcpy(name, "unknown", namelen);
 432   }
 433
 434   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);
 435
 436   return (name);
 437 }
 438
 439
 440 /*
 441  * 'cupsdStartProcess()' - Start a process.
 442  */
 443
 444 int                                     /* O - Process ID or 0 */
 445 cupsdStartProcess(
 446     const char  *command,               /* I - Full path to command */
 447     char        *argv[],                /* I - Command-line arguments */
 448     char        *envp[],                /* I - Environment */
 449     int         infd,                   /* I - Standard input file descriptor */
 450     int         outfd,                  /* I - Standard output file descriptor */
 451     int         errfd,                  /* I - Standard error file descriptor */
 452     int         backfd,                 /* I - Backchannel file descriptor */
 453     int         sidefd,                 /* I - Sidechannel file descriptor */
 454     int         root,                   /* I - Run as root? */
 455     void        *profile,               /* I - Security profile to use */
 456     cupsd_job_t *job,                   /* I - Job associated with process */
 457     int         *pid)                   /* O - Process ID */
 458 {
 459   int           i;                      /* Looping var */
 460   const char    *exec_path = command;   /* Command to be exec'd */
 461   char          *real_argv[110],        /* Real command-line arguments */
 462                 cups_exec[1024];        /* Path to "cups-exec" program */
 463   uid_t         user;                   /* Command UID */
 464   cupsd_proc_t  *proc;                  /* New process record */
 465 #ifdef HAVE_POSIX_SPAWN
 466   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 467   posix_spawnattr_t attrs;              /* Spawn attributes */
 468   char          user_str[16],           /* User string */
 469                 group_str[16],          /* Group string */
 470                 nice_str[16];           /* FilterNice string */
 471 #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 472   struct sigaction action;              /* POSIX signal handler */
 473 #endif /* HAVE_POSIX_SPAWN */
 474 #if defined(__APPLE__)
 475   char          processPath[1024],      /* CFProcessPath environment variable */
 476                 linkpath[1024];         /* Link path for symlinks... */
 477   int           linkbytes;              /* Bytes for link path */
 478 #endif /* __APPLE__ */
 479
 480
 481   *pid = 0;
 482
 483  /*
 484   * Figure out the UID for the child process...
 485   */
 486
 487   if (RunUser)
 488     user = RunUser;
 489   else if (root)
 490     user = 0;
 491   else
 492     user = User;
 493
 494  /*
 495   * Check the permissions of the command we are running...
 496   */
 497
 498   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 499                      cupsdLogFCMessage, job ? job->printer : NULL))
 500     return (0);
 501
 502 #if defined(__APPLE__)
 503   if (envp)
 504   {
 505    /*
 506     * Add special voodoo magic for OS X - this allows OS X programs to access
 507     * their bundle resources properly...
 508     */
 509
 510     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 511     {
 512      /*
 513       * Yes, this is a symlink to the actual program, nul-terminate and
 514       * use it...
 515       */
 516
 517       linkpath[linkbytes] = '\0';
 518
 519       if (linkpath[0] == '/')
 520         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 521                  linkpath);
 522       else
 523         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 524                  dirname((char *)command), linkpath);
 525     }
 526     else
 527       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 528
 529     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 530   }
 531 #endif  /* __APPLE__ */
 532
 533  /*
 534   * Use helper program when we have a sandbox profile...
 535   */
 536
 537 #ifndef HAVE_POSIX_SPAWN
 538   if (profile)
 539 #endif /* !HAVE_POSIX_SPAWN */
 540   {
 541     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 542     snprintf(user_str, sizeof(user_str), "%d", user);
 543     snprintf(group_str, sizeof(group_str), "%d", Group);
 544     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 545
 546     real_argv[0] = cups_exec;
 547     real_argv[1] = (char *)"-g";
 548     real_argv[2] = group_str;
 549     real_argv[3] = (char *)"-n";
 550     real_argv[4] = nice_str;
 551     real_argv[5] = (char *)"-u";
 552     real_argv[6] = user_str;
 553     real_argv[7] = profile ? profile : "none";
 554     real_argv[8] = (char *)command;
 555
 556     for (i = 0;
 557          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 558          i ++)
 559       real_argv[i + 9] = argv[i];
 560
 561     real_argv[i + 9] = NULL;
 562
 563     argv      = real_argv;
 564     exec_path = cups_exec;
 565   }
 566
 567   if (LogLevel == CUPSD_LOG_DEBUG2)
 568   {
 569     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 570
 571     for (i = 0; argv[i]; i ++)
 572       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 573   }
 574
 575 #ifdef HAVE_POSIX_SPAWN
 576  /*
 577   * Setup attributes and file actions for the spawn...
 578   */
 579
 580   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 581   posix_spawnattr_init(&attrs);
 582   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 583
 584   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 585   posix_spawn_file_actions_init(&actions);
 586   if (infd != 0)
 587   {
 588     if (infd < 0)
 589       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 590     else
 591       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 592   }
 593
 594   if (outfd != 1)
 595   {
 596     if (outfd < 0)
 597       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 598     else
 599       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 600   }
 601
 602   if (errfd != 2)
 603   {
 604     if (errfd < 0)
 605       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 606     else
 607       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 608   }
 609
 610   if (backfd != 3 && backfd >= 0)
 611     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 612
 613   if (sidefd != 4 && sidefd >= 0)
 614     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 615
 616   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 617
 618   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 619   {
 620     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 621
 622     *pid = 0;
 623   }
 624   else
 625     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 626
 627   posix_spawn_file_actions_destroy(&actions);
 628   posix_spawnattr_destroy(&attrs);
 629
 630 #else
 631  /*
 632   * Block signals before forking...
 633   */
 634
 635   cupsdHoldSignals();
 636
 637   if ((*pid = fork()) == 0)
 638   {
 639    /*
 640     * Child process goes here; update stderr as needed...
 641     */
 642
 643     if (errfd != 2)
 644     {
 645       if (errfd < 0)
 646         errfd = open("/dev/null", O_WRONLY);
 647
 648       if (errfd != 2)
 649       {
 650         dup2(errfd, 2);
 651         close(errfd);
 652       }
 653     }
 654
 655    /*
 656     * Put this process in its own process group so that we can kill any child
 657     * processes it creates.
 658     */
 659
 660 #  ifdef HAVE_SETPGID
 661     if (!RunUser && setpgid(0, 0))
 662       exit(errno + 100);
 663 #  else
 664     if (!RunUser && setpgrp())
 665       exit(errno + 100);
 666 #  endif /* HAVE_SETPGID */
 667
 668    /*
 669     * Update the remaining file descriptors as needed...
 670     */
 671
 672     if (infd != 0)
 673     {
 674       if (infd < 0)
 675         infd = open("/dev/null", O_RDONLY);
 676
 677       if (infd != 0)
 678       {
 679         dup2(infd, 0);
 680         close(infd);
 681       }
 682     }
 683
 684     if (outfd != 1)
 685     {
 686       if (outfd < 0)
 687         outfd = open("/dev/null", O_WRONLY);
 688
 689       if (outfd != 1)
 690       {
 691         dup2(outfd, 1);
 692         close(outfd);
 693       }
 694     }
 695
 696     if (backfd != 3 && backfd >= 0)
 697     {
 698       dup2(backfd, 3);
 699       close(backfd);
 700       fcntl(3, F_SETFL, O_NDELAY);
 701     }
 702
 703     if (sidefd != 4 && sidefd >= 0)
 704     {
 705       dup2(sidefd, 4);
 706       close(sidefd);
 707       fcntl(4, F_SETFL, O_NDELAY);
 708     }
 709
 710    /*
 711     * Change the priority of the process based on the FilterNice setting.
 712     * (this is not done for root processes...)
 713     */
 714
 715     if (!root)
 716       nice(FilterNice);
 717
 718    /*
 719     * Reset group membership to just the main one we belong to.
 720     */
 721
 722     if (!RunUser && setgid(Group))
 723       exit(errno + 100);
 724
 725     if (!RunUser && setgroups(1, &Group))
 726       exit(errno + 100);
 727
 728    /*
 729     * Change user to something "safe"...
 730     */
 731
 732     if (!RunUser && user && setuid(user))
 733       exit(errno + 100);
 734
 735    /*
 736     * Change umask to restrict permissions on created files...
 737     */
 738
 739     umask(077);
 740
 741    /*
 742     * Unblock signals before doing the exec...
 743     */
 744
 745 #  ifdef HAVE_SIGSET
 746     sigset(SIGTERM, SIG_DFL);
 747     sigset(SIGCHLD, SIG_DFL);
 748     sigset(SIGPIPE, SIG_DFL);
 749 #  elif defined(HAVE_SIGACTION)
 750     memset(&action, 0, sizeof(action));
 751
 752     sigemptyset(&action.sa_mask);
 753     action.sa_handler = SIG_DFL;
 754
 755     sigaction(SIGTERM, &action, NULL);
 756     sigaction(SIGCHLD, &action, NULL);
 757     sigaction(SIGPIPE, &action, NULL);
 758 #  else
 759     signal(SIGTERM, SIG_DFL);
 760     signal(SIGCHLD, SIG_DFL);
 761     signal(SIGPIPE, SIG_DFL);
 762 #  endif /* HAVE_SIGSET */
 763
 764     cupsdReleaseSignals();
 765
 766    /*
 767     * Execute the command; if for some reason this doesn't work, log an error
 768     * exit with a non-zero value...
 769     */
 770
 771     if (envp)
 772       execve(exec_path, argv, envp);
 773     else
 774       execv(exec_path, argv);
 775
 776     exit(errno + 100);
 777   }
 778   else if (*pid < 0)
 779   {
 780    /*
 781     * Error - couldn't fork a new process!
 782     */
 783
 784     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 785                     strerror(errno));
 786
 787     *pid = 0;
 788   }
 789
 790   cupsdReleaseSignals();
 791 #endif /* HAVE_POSIX_SPAWN */
 792
 793   if (*pid)
 794   {
 795     if (!process_array)
 796       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 797
 798     if (process_array)
 799     {
 800       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 801       {
 802         proc->pid    = *pid;
 803         proc->job_id = job ? job->id : 0;
 804         _cups_strcpy(proc->name, command);
 805
 806         cupsArrayAdd(process_array, proc);
 807       }
 808     }
 809   }
 810
 811   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 812                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 813                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 814                   "profile=%p, job=%p(%d), pid=%p) = %d",
 815                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 816                   root, profile, job, job ? job->id : 0, pid, *pid);
 817
 818   return (*pid);
 819 }
 820
 821
 822 /*
 823  * 'compare_procs()' - Compare two processes.
 824  */
 825
 826 static int                              /* O - Result of comparison */
 827 compare_procs(cupsd_proc_t *a,          /* I - First process */
 828               cupsd_proc_t *b)          /* I - Second process */
 829 {
 830   return (a->pid - b->pid);
 831 }
 832
 833
 834 #ifdef HAVE_SANDBOX_H
 835 /*
 836  * 'cupsd_requote()' - Make a regular-expression version of a string.
 837  */
 838
 839 static char *                           /* O - Quoted string */
 840 cupsd_requote(char       *dst,          /* I - Destination buffer */
 841               const char *src,          /* I - Source string */
 842               size_t     dstsize)       /* I - Size of destination buffer */
 843 {
 844   int   ch;                             /* Current character */
 845   char  *dstptr,                        /* Current position in buffer */
 846         *dstend;                        /* End of destination buffer */
 847
 848
 849   dstptr = dst;
 850   dstend = dst + dstsize - 2;
 851
 852   while (*src && dstptr < dstend)
 853   {
 854     ch = *src++;
 855
 856     if (ch == '/' && !*src)
 857       break;                            /* Don't add trailing slash */
 858
 859     if (strchr(".?*()[]^$\\", ch))
 860       *dstptr++ = '\\';
 861
 862     *dstptr++ = (char)ch;
 863   }
 864
 865   *dstptr = '\0';
 866
 867   return (dst);
 868 }
 869 #endif /* HAVE_SANDBOX_H */
 870
 871
 872 /*
 873  * End of "$Id$".
 874  */