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