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