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