scheduler/process.c

   1 /*
   2  * "$Id: process.c 12471 2015-02-01 05:07:10Z msweet $"
   3  *
   4  * Process management routines for the CUPS scheduler.
   5  *
   6  * Copyright 2007-2015 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 #ifdef HAVE_POSIX_SPAWN
  30 #  if !defined(__OpenBSD__) || OpenBSD >= 201505
  31 #    define USE_POSIX_SPAWN 1
  32 #  else
  33 #    define USE_POSIX_SPAWN 0
  34 #  endif /* !__OpenBSD__ || */
  35 #else
  36 #  define USE_POSIX_SPAWN 0
  37 #endif /* HAVE_POSIX_SPAWN */
  38
  39
  40 /*
  41  * Process structure...
  42  */
  43
  44 typedef struct
  45 {
  46   int   pid,                            /* Process ID */
  47         job_id;                         /* Job associated with process */
  48   char  name[1];                        /* Name of process */
  49 } cupsd_proc_t;
  50
  51
  52 /*
  53  * Local globals...
  54  */
  55
  56 static cups_array_t     *process_array = NULL;
  57
  58
  59 /*
  60  * Local functions...
  61  */
  62
  63 static int      compare_procs(cupsd_proc_t *a, cupsd_proc_t *b);
  64 #ifdef HAVE_SANDBOX_H
  65 static char     *cupsd_requote(char *dst, const char *src, size_t dstsize);
  66 #endif /* HAVE_SANDBOX_H */
  67
  68
  69 /*
  70  * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
  71  */
  72
  73 void *                                  /* O - Profile or NULL on error */
  74 cupsdCreateProfile(int job_id,          /* I - Job ID or 0 for none */
  75                    int allow_networking)/* I - Allow networking off machine? */
  76 {
  77 #ifdef HAVE_SANDBOX_H
  78   cups_file_t           *fp;            /* File pointer */
  79   char                  profile[1024],  /* File containing the profile */
  80                         bin[1024],      /* Quoted ServerBin */
  81                         cache[1024],    /* Quoted CacheDir */
  82                         domain[1024],   /* Domain socket, if any */
  83                         request[1024],  /* Quoted RequestRoot */
  84                         root[1024],     /* Quoted ServerRoot */
  85                         state[1024],    /* Quoted StateDir */
  86                         temp[1024];     /* Quoted TempDir */
  87   const char            *nodebug;       /* " (with no-log)" for no debug */
  88   cupsd_listener_t      *lis;           /* Current listening socket */
  89
  90
  91   if (!UseSandboxing || Sandboxing == CUPSD_SANDBOXING_OFF)
  92   {
  93    /*
  94     * Only use sandbox profiles as root...
  95     */
  96
  97     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  98
  99     return (NULL);
 100   }
 101
 102   if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
 103   {
 104     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 105     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s",
 106                     strerror(errno));
 107     return (NULL);
 108   }
 109
 110   fchown(cupsFileNumber(fp), RunUser, Group);
 111   fchmod(cupsFileNumber(fp), 0640);
 112
 113   cupsd_requote(bin, ServerBin, sizeof(bin));
 114   cupsd_requote(cache, CacheDir, sizeof(cache));
 115   cupsd_requote(request, RequestRoot, sizeof(request));
 116   cupsd_requote(root, ServerRoot, sizeof(root));
 117   cupsd_requote(state, StateDir, sizeof(state));
 118   cupsd_requote(temp, TempDir, sizeof(temp));
 119
 120   nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
 121
 122   cupsFilePuts(fp, "(version 1)\n");
 123   if (Sandboxing == CUPSD_SANDBOXING_STRICT)
 124     cupsFilePuts(fp, "(deny default)\n");
 125   else
 126     cupsFilePuts(fp, "(allow default)\n");
 127   if (LogLevel >= CUPSD_LOG_DEBUG)
 128     cupsFilePuts(fp, "(debug deny)\n");
 129   cupsFilePuts(fp, "(import \"system.sb\")\n");
 130   cupsFilePuts(fp, "(system-network)\n");
 131   cupsFilePuts(fp, "(allow mach-per-user-lookup)\n");
 132   cupsFilePuts(fp, "(allow ipc-posix-sem)\n");
 133   cupsFilePuts(fp, "(allow ipc-posix-shm)\n");
 134   cupsFilePuts(fp, "(allow ipc-sysv-shm)\n");
 135   cupsFilePuts(fp, "(allow mach-lookup)\n");
 136   if (!RunUser)
 137     cupsFilePrintf(fp,
 138                    "(deny file-write* file-read-data file-read-metadata\n"
 139                    "  (regex"
 140                    " #\"^/Users$\""
 141                    " #\"^/Users/\""
 142                    ")%s)\n", nodebug);
 143   cupsFilePrintf(fp,
 144                  "(deny file-write*\n"
 145                  "  (regex"
 146                  " #\"^%s$\""           /* ServerRoot */
 147                  " #\"^%s/\""           /* ServerRoot/... */
 148                  " #\"^/private/etc$\""
 149                  " #\"^/private/etc/\""
 150                  " #\"^/usr/local/etc$\""
 151                  " #\"^/usr/local/etc/\""
 152                  " #\"^/Library$\""
 153                  " #\"^/Library/\""
 154                  " #\"^/System$\""
 155                  " #\"^/System/\""
 156                  ")%s)\n",
 157                  root, root, nodebug);
 158   /* Specifically allow applications to stat RequestRoot and some other system folders */
 159   cupsFilePrintf(fp,
 160                  "(allow file-read-metadata\n"
 161                  "  (regex"
 162                  " #\"^/$\""            /* / */
 163                  " #\"^/usr$\""         /* /usr */
 164                  " #\"^/Library$\""     /* /Library */
 165                  " #\"^/Library/Printers$\""    /* /Library/Printers */
 166                  " #\"^%s$\""           /* RequestRoot */
 167                  "))\n",
 168                  request);
 169   /* Read and write TempDir, CacheDir, and other common folders */
 170   cupsFilePuts(fp,
 171                "(allow file-write* file-read-data file-read-metadata\n"
 172                "  (regex"
 173                " #\"^/private/var/db/\""
 174                " #\"^/private/var/folders/\""
 175                " #\"^/private/var/lib/\""
 176                " #\"^/private/var/log/\""
 177                " #\"^/private/var/mysql/\""
 178                " #\"^/private/var/run/\""
 179                " #\"^/private/var/spool/\""
 180                " #\"^/Library/Application Support/\""
 181                " #\"^/Library/Caches/\""
 182                " #\"^/Library/Logs/\""
 183                " #\"^/Library/Preferences/\""
 184                " #\"^/Library/WebServer/\""
 185                " #\"^/Users/Shared/\""
 186                "))\n");
 187   cupsFilePrintf(fp,
 188                  "(deny file-write*\n"
 189                  "       (regex #\"^%s$\")%s)\n",
 190                  request, nodebug);
 191   cupsFilePrintf(fp,
 192                  "(deny file-write* file-read-data file-read-metadata\n"
 193                  "       (regex #\"^%s/\")%s)\n",
 194                  request, nodebug);
 195   cupsFilePrintf(fp,
 196                  "(allow file-write* file-read-data file-read-metadata\n"
 197                  "  (regex"
 198                  " #\"^%s$\""           /* TempDir */
 199                  " #\"^%s/\""           /* TempDir/... */
 200                  " #\"^%s$\""           /* CacheDir */
 201                  " #\"^%s/\""           /* CacheDir/... */
 202                  " #\"^%s$\""           /* StateDir */
 203                  " #\"^%s/\""           /* StateDir/... */
 204                  "))\n",
 205                  temp, temp, cache, cache, state, state);
 206   /* Read common folders */
 207   cupsFilePrintf(fp,
 208                  "(allow file-read-data file-read-metadata\n"
 209                  "  (regex"
 210                  " #\"^/AppleInternal$\""
 211                  " #\"^/AppleInternal/\""
 212                  " #\"^/bin$\""         /* /bin */
 213                  " #\"^/bin/\""         /* /bin/... */
 214                  " #\"^/private$\""
 215                  " #\"^/private/etc$\""
 216                  " #\"^/private/etc/\""
 217                  " #\"^/private/tmp$\""
 218                  " #\"^/private/tmp/\""
 219                  " #\"^/private/var$\""
 220                  " #\"^/private/var/db$\""
 221                  " #\"^/private/var/folders$\""
 222                  " #\"^/private/var/lib$\""
 223                  " #\"^/private/var/log$\""
 224                  " #\"^/private/var/mysql$\""
 225                  " #\"^/private/var/run$\""
 226                  " #\"^/private/var/spool$\""
 227                  " #\"^/private/var/tmp$\""
 228                  " #\"^/private/var/tmp/\""
 229                  " #\"^/usr/bin$\""     /* /usr/bin */
 230                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 231                  " #\"^/usr/libexec/cups$\""    /* /usr/libexec/cups */
 232                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 233                  " #\"^/usr/libexec/fax$\""     /* /usr/libexec/fax */
 234                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 235                  " #\"^/usr/sbin$\""    /* /usr/sbin */
 236                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 237                  " #\"^/Library$\""     /* /Library */
 238                  " #\"^/Library/\""     /* /Library/... */
 239                  " #\"^/System$\""      /* /System */
 240                  " #\"^/System/\""      /* /System/... */
 241                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 242                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 243                  " #\"^%s$\""           /* ServerBin */
 244                  " #\"^%s/\""           /* ServerBin/... */
 245                  " #\"^%s$\""           /* ServerRoot */
 246                  " #\"^%s/\""           /* ServerRoot/... */
 247                  "))\n",
 248                  request, request, bin, bin, root, root);
 249   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 250   {
 251     /* Limited write access to /Library/Printers/... */
 252     cupsFilePuts(fp,
 253                  "(allow file-write*\n"
 254                  "  (regex"
 255                  " #\"^/Library/Printers/.*/\""
 256                  "))\n");
 257     cupsFilePrintf(fp,
 258                    "(deny file-write*\n"
 259                    "  (regex"
 260                    " #\"^/Library/Printers/PPDs$\""
 261                    " #\"^/Library/Printers/PPDs/\""
 262                    " #\"^/Library/Printers/PPD Plugins$\""
 263                    " #\"^/Library/Printers/PPD Plugins/\""
 264                    ")%s)\n", nodebug);
 265   }
 266   /* Allow execution of child processes as long as the programs are not in a user directory */
 267   cupsFilePuts(fp, "(allow process*)\n");
 268   cupsFilePuts(fp, "(deny process-exec (regex #\"^/Users/\"))\n");
 269   if (RunUser && getenv("CUPS_TESTROOT"))
 270   {
 271     /* Allow source directory access in "make test" environment */
 272     char        testroot[1024];         /* Root directory of test files */
 273
 274     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 275
 276     cupsFilePrintf(fp,
 277                    "(allow file-write* file-read-data file-read-metadata\n"
 278                    "  (regex"
 279                    " #\"^%s$\""         /* CUPS_TESTROOT */
 280                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 281                    "))\n",
 282                    testroot, testroot);
 283     cupsFilePrintf(fp,
 284                    "(allow process-exec\n"
 285                    "  (regex"
 286                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 287                    "))\n",
 288                    testroot);
 289     cupsFilePrintf(fp, "(allow sysctl*)\n");
 290   }
 291   if (job_id)
 292   {
 293     /* Allow job filters to read the current job files... */
 294     cupsFilePrintf(fp,
 295                    "(allow file-read-data file-read-metadata\n"
 296                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 297                    request, job_id, job_id);
 298   }
 299   else
 300   {
 301     /* Allow email notifications from notifiers... */
 302     cupsFilePuts(fp,
 303                  "(allow process-exec\n"
 304                  "  (literal \"/usr/sbin/sendmail\")\n"
 305                  "  (with no-sandbox))\n");
 306   }
 307   /* Allow access to Bluetooth, USB, and notify_post. */
 308   cupsFilePuts(fp, "(allow iokit*)\n");
 309   cupsFilePuts(fp, "(allow distributed-notification-post)\n");
 310   /* Allow outbound networking to local services */
 311   cupsFilePuts(fp, "(allow network-outbound"
 312                    "\n       (regex #\"^/private/var/run/\" #\"^/private/tmp/\" #\"^/private/var/tmp/\")");
 313   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 314        lis;
 315        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 316   {
 317     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 318     {
 319       httpAddrString(&(lis->address), domain, sizeof(domain));
 320       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 321     }
 322   }
 323   if (allow_networking)
 324   {
 325     /* Allow TCP and UDP networking off the machine... */
 326     cupsFilePuts(fp, "\n       (remote tcp))\n");
 327     cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
 328     cupsFilePuts(fp, "(allow network*\n"
 329                      "       (local udp \"*:*\")\n"
 330                      "       (remote udp \"*:*\"))\n");
 331
 332     /* Also allow access to device files... */
 333     cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
 334                      "       (regex #\"^/dev/\"))\n");
 335
 336     /* And allow kernel extensions to be loaded, e.g., SMB */
 337     cupsFilePuts(fp, "(allow system-kext-load)\n");
 338   }
 339   else
 340   {
 341     /* Only allow SNMP (UDP) and LPD (TCP) off the machine... */
 342     cupsFilePuts(fp, ")\n");
 343     cupsFilePuts(fp, "(allow network-outbound\n"
 344                      "       (remote udp \"*:161\")"
 345                      "       (remote tcp \"*:515\"))\n");
 346     cupsFilePuts(fp, "(allow network-inbound\n"
 347                      "       (local udp \"localhost:*\"))\n");
 348   }
 349   cupsFileClose(fp);
 350
 351   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 352   return ((void *)strdup(profile));
 353
 354 #else
 355   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 356
 357   return (NULL);
 358 #endif /* HAVE_SANDBOX_H */
 359 }
 360
 361
 362 /*
 363  * 'cupsdDestroyProfile()' - Delete an execution profile.
 364  */
 365
 366 void
 367 cupsdDestroyProfile(void *profile)      /* I - Profile */
 368 {
 369   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 370                   profile ? (char *)profile : "(null)");
 371
 372 #ifdef HAVE_SANDBOX_H
 373   if (profile)
 374   {
 375     unlink((char *)profile);
 376     free(profile);
 377   }
 378 #endif /* HAVE_SANDBOX_H */
 379 }
 380
 381
 382 /*
 383  * 'cupsdEndProcess()' - End a process.
 384  */
 385
 386 int                                     /* O - 0 on success, -1 on failure */
 387 cupsdEndProcess(int pid,                /* I - Process ID */
 388                 int force)              /* I - Force child to die */
 389 {
 390   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 391                   force);
 392
 393   if (!pid)
 394     return (0);
 395
 396   if (!RunUser)
 397   {
 398    /*
 399     * When running as root, cupsd puts child processes in their own process
 400     * group.  Using "-pid" sends a signal to all processes in the group.
 401     */
 402
 403     pid = -pid;
 404   }
 405
 406   if (force)
 407     return (kill(pid, SIGKILL));
 408   else
 409     return (kill(pid, SIGTERM));
 410 }
 411
 412
 413 /*
 414  * 'cupsdFinishProcess()' - Finish a process and get its name.
 415  */
 416
 417 const char *                            /* O - Process name */
 418 cupsdFinishProcess(int    pid,          /* I - Process ID */
 419                    char   *name,        /* I - Name buffer */
 420                    size_t namelen,      /* I - Size of name buffer */
 421                    int    *job_id)      /* O - Job ID pointer or NULL */
 422 {
 423   cupsd_proc_t  key,                    /* Search key */
 424                 *proc;                  /* Matching process */
 425
 426
 427   key.pid = pid;
 428
 429   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 430   {
 431     if (job_id)
 432       *job_id = proc->job_id;
 433
 434     strlcpy(name, proc->name, namelen);
 435     cupsArrayRemove(process_array, proc);
 436     free(proc);
 437   }
 438   else
 439   {
 440     if (job_id)
 441       *job_id = 0;
 442
 443     strlcpy(name, "unknown", namelen);
 444   }
 445
 446   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);
 447
 448   return (name);
 449 }
 450
 451
 452 /*
 453  * 'cupsdStartProcess()' - Start a process.
 454  */
 455
 456 int                                     /* O - Process ID or 0 */
 457 cupsdStartProcess(
 458     const char  *command,               /* I - Full path to command */
 459     char        *argv[],                /* I - Command-line arguments */
 460     char        *envp[],                /* I - Environment */
 461     int         infd,                   /* I - Standard input file descriptor */
 462     int         outfd,                  /* I - Standard output file descriptor */
 463     int         errfd,                  /* I - Standard error file descriptor */
 464     int         backfd,                 /* I - Backchannel file descriptor */
 465     int         sidefd,                 /* I - Sidechannel file descriptor */
 466     int         root,                   /* I - Run as root? */
 467     void        *profile,               /* I - Security profile to use */
 468     cupsd_job_t *job,                   /* I - Job associated with process */
 469     int         *pid)                   /* O - Process ID */
 470 {
 471   int           i;                      /* Looping var */
 472   const char    *exec_path = command;   /* Command to be exec'd */
 473   char          *real_argv[110],        /* Real command-line arguments */
 474                 cups_exec[1024],        /* Path to "cups-exec" program */
 475                 user_str[16],           /* User string */
 476                 group_str[16],          /* Group string */
 477                 nice_str[16];           /* FilterNice string */
 478   uid_t         user;                   /* Command UID */
 479   cupsd_proc_t  *proc;                  /* New process record */
 480 #if USE_POSIX_SPAWN
 481   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 482   posix_spawnattr_t attrs;              /* Spawn attributes */
 483   sigset_t      defsignals;             /* Default signals */
 484 #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 485   struct sigaction action;              /* POSIX signal handler */
 486 #endif /* USE_POSIX_SPAWN */
 487 #if defined(__APPLE__)
 488   char          processPath[1024],      /* CFProcessPath environment variable */
 489                 linkpath[1024];         /* Link path for symlinks... */
 490   int           linkbytes;              /* Bytes for link path */
 491 #endif /* __APPLE__ */
 492
 493
 494   *pid = 0;
 495
 496  /*
 497   * Figure out the UID for the child process...
 498   */
 499
 500   if (RunUser)
 501     user = RunUser;
 502   else if (root)
 503     user = 0;
 504   else
 505     user = User;
 506
 507  /*
 508   * Check the permissions of the command we are running...
 509   */
 510
 511   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 512                      cupsdLogFCMessage, job ? job->printer : NULL))
 513     return (0);
 514
 515 #if defined(__APPLE__)
 516   if (envp)
 517   {
 518    /*
 519     * Add special voodoo magic for OS X - this allows OS X programs to access
 520     * their bundle resources properly...
 521     */
 522
 523     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 524     {
 525      /*
 526       * Yes, this is a symlink to the actual program, nul-terminate and
 527       * use it...
 528       */
 529
 530       linkpath[linkbytes] = '\0';
 531
 532       if (linkpath[0] == '/')
 533         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 534                  linkpath);
 535       else
 536         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 537                  dirname((char *)command), linkpath);
 538     }
 539     else
 540       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 541
 542     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 543   }
 544 #endif  /* __APPLE__ */
 545
 546  /*
 547   * Use helper program when we have a sandbox profile...
 548   */
 549
 550 #if !USE_POSIX_SPAWN
 551   if (profile)
 552 #endif /* !USE_POSIX_SPAWN */
 553   {
 554     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 555     snprintf(user_str, sizeof(user_str), "%d", user);
 556     snprintf(group_str, sizeof(group_str), "%d", Group);
 557     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 558
 559     real_argv[0] = cups_exec;
 560     real_argv[1] = (char *)"-g";
 561     real_argv[2] = group_str;
 562     real_argv[3] = (char *)"-n";
 563     real_argv[4] = nice_str;
 564     real_argv[5] = (char *)"-u";
 565     real_argv[6] = user_str;
 566     real_argv[7] = profile ? profile : "none";
 567     real_argv[8] = (char *)command;
 568
 569     for (i = 0;
 570          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 571          i ++)
 572       real_argv[i + 9] = argv[i];
 573
 574     real_argv[i + 9] = NULL;
 575
 576     argv      = real_argv;
 577     exec_path = cups_exec;
 578   }
 579
 580   if (LogLevel == CUPSD_LOG_DEBUG2)
 581   {
 582     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 583
 584     for (i = 0; argv[i]; i ++)
 585       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 586   }
 587
 588 #if USE_POSIX_SPAWN
 589  /*
 590   * Setup attributes and file actions for the spawn...
 591   */
 592
 593   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 594   sigemptyset(&defsignals);
 595   sigaddset(&defsignals, SIGTERM);
 596   sigaddset(&defsignals, SIGCHLD);
 597   sigaddset(&defsignals, SIGPIPE);
 598
 599   posix_spawnattr_init(&attrs);
 600   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 601   posix_spawnattr_setpgroup(&attrs, 0);
 602   posix_spawnattr_setsigdefault(&attrs, &defsignals);
 603
 604   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 605   posix_spawn_file_actions_init(&actions);
 606   if (infd != 0)
 607   {
 608     if (infd < 0)
 609       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 610     else
 611       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 612   }
 613
 614   if (outfd != 1)
 615   {
 616     if (outfd < 0)
 617       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 618     else
 619       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 620   }
 621
 622   if (errfd != 2)
 623   {
 624     if (errfd < 0)
 625       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 626     else
 627       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 628   }
 629
 630   if (backfd != 3 && backfd >= 0)
 631     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 632
 633   if (sidefd != 4 && sidefd >= 0)
 634     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 635
 636   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 637
 638   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 639   {
 640     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 641
 642     *pid = 0;
 643   }
 644   else
 645     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 646
 647   posix_spawn_file_actions_destroy(&actions);
 648   posix_spawnattr_destroy(&attrs);
 649
 650 #else
 651  /*
 652   * Block signals before forking...
 653   */
 654
 655   cupsdHoldSignals();
 656
 657   if ((*pid = fork()) == 0)
 658   {
 659    /*
 660     * Child process goes here; update stderr as needed...
 661     */
 662
 663     if (errfd != 2)
 664     {
 665       if (errfd < 0)
 666         errfd = open("/dev/null", O_WRONLY);
 667
 668       if (errfd != 2)
 669       {
 670         dup2(errfd, 2);
 671         close(errfd);
 672       }
 673     }
 674
 675    /*
 676     * Put this process in its own process group so that we can kill any child
 677     * processes it creates.
 678     */
 679
 680 #  ifdef HAVE_SETPGID
 681     if (!RunUser && setpgid(0, 0))
 682       exit(errno + 100);
 683 #  else
 684     if (!RunUser && setpgrp())
 685       exit(errno + 100);
 686 #  endif /* HAVE_SETPGID */
 687
 688    /*
 689     * Update the remaining file descriptors as needed...
 690     */
 691
 692     if (infd != 0)
 693     {
 694       if (infd < 0)
 695         infd = open("/dev/null", O_RDONLY);
 696
 697       if (infd != 0)
 698       {
 699         dup2(infd, 0);
 700         close(infd);
 701       }
 702     }
 703
 704     if (outfd != 1)
 705     {
 706       if (outfd < 0)
 707         outfd = open("/dev/null", O_WRONLY);
 708
 709       if (outfd != 1)
 710       {
 711         dup2(outfd, 1);
 712         close(outfd);
 713       }
 714     }
 715
 716     if (backfd != 3 && backfd >= 0)
 717     {
 718       dup2(backfd, 3);
 719       close(backfd);
 720       fcntl(3, F_SETFL, O_NDELAY);
 721     }
 722
 723     if (sidefd != 4 && sidefd >= 0)
 724     {
 725       dup2(sidefd, 4);
 726       close(sidefd);
 727       fcntl(4, F_SETFL, O_NDELAY);
 728     }
 729
 730    /*
 731     * Change the priority of the process based on the FilterNice setting.
 732     * (this is not done for root processes...)
 733     */
 734
 735     if (!root)
 736       nice(FilterNice);
 737
 738    /*
 739     * Reset group membership to just the main one we belong to.
 740     */
 741
 742     if (!RunUser && setgid(Group))
 743       exit(errno + 100);
 744
 745     if (!RunUser && setgroups(1, &Group))
 746       exit(errno + 100);
 747
 748    /*
 749     * Change user to something "safe"...
 750     */
 751
 752     if (!RunUser && user && setuid(user))
 753       exit(errno + 100);
 754
 755    /*
 756     * Change umask to restrict permissions on created files...
 757     */
 758
 759     umask(077);
 760
 761    /*
 762     * Unblock signals before doing the exec...
 763     */
 764
 765 #  ifdef HAVE_SIGSET
 766     sigset(SIGTERM, SIG_DFL);
 767     sigset(SIGCHLD, SIG_DFL);
 768     sigset(SIGPIPE, SIG_DFL);
 769 #  elif defined(HAVE_SIGACTION)
 770     memset(&action, 0, sizeof(action));
 771
 772     sigemptyset(&action.sa_mask);
 773     action.sa_handler = SIG_DFL;
 774
 775     sigaction(SIGTERM, &action, NULL);
 776     sigaction(SIGCHLD, &action, NULL);
 777     sigaction(SIGPIPE, &action, NULL);
 778 #  else
 779     signal(SIGTERM, SIG_DFL);
 780     signal(SIGCHLD, SIG_DFL);
 781     signal(SIGPIPE, SIG_DFL);
 782 #  endif /* HAVE_SIGSET */
 783
 784     cupsdReleaseSignals();
 785
 786    /*
 787     * Execute the command; if for some reason this doesn't work, log an error
 788     * exit with a non-zero value...
 789     */
 790
 791     if (envp)
 792       execve(exec_path, argv, envp);
 793     else
 794       execv(exec_path, argv);
 795
 796     exit(errno + 100);
 797   }
 798   else if (*pid < 0)
 799   {
 800    /*
 801     * Error - couldn't fork a new process!
 802     */
 803
 804     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 805                     strerror(errno));
 806
 807     *pid = 0;
 808   }
 809
 810   cupsdReleaseSignals();
 811 #endif /* USE_POSIX_SPAWN */
 812
 813   if (*pid)
 814   {
 815     if (!process_array)
 816       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 817
 818     if (process_array)
 819     {
 820       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 821       {
 822         proc->pid    = *pid;
 823         proc->job_id = job ? job->id : 0;
 824         _cups_strcpy(proc->name, command);
 825
 826         cupsArrayAdd(process_array, proc);
 827       }
 828     }
 829   }
 830
 831   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 832                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 833                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 834                   "profile=%p, job=%p(%d), pid=%p) = %d",
 835                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 836                   root, profile, job, job ? job->id : 0, pid, *pid);
 837
 838   return (*pid);
 839 }
 840
 841
 842 /*
 843  * 'compare_procs()' - Compare two processes.
 844  */
 845
 846 static int                              /* O - Result of comparison */
 847 compare_procs(cupsd_proc_t *a,          /* I - First process */
 848               cupsd_proc_t *b)          /* I - Second process */
 849 {
 850   return (a->pid - b->pid);
 851 }
 852
 853
 854 #ifdef HAVE_SANDBOX_H
 855 /*
 856  * 'cupsd_requote()' - Make a regular-expression version of a string.
 857  */
 858
 859 static char *                           /* O - Quoted string */
 860 cupsd_requote(char       *dst,          /* I - Destination buffer */
 861               const char *src,          /* I - Source string */
 862               size_t     dstsize)       /* I - Size of destination buffer */
 863 {
 864   int   ch;                             /* Current character */
 865   char  *dstptr,                        /* Current position in buffer */
 866         *dstend;                        /* End of destination buffer */
 867
 868
 869   dstptr = dst;
 870   dstend = dst + dstsize - 2;
 871
 872   while (*src && dstptr < dstend)
 873   {
 874     ch = *src++;
 875
 876     if (ch == '/' && !*src)
 877       break;                            /* Don't add trailing slash */
 878
 879     if (strchr(".?*()[]^$\\", ch))
 880       *dstptr++ = '\\';
 881
 882     *dstptr++ = (char)ch;
 883   }
 884
 885   *dstptr = '\0';
 886
 887   return (dst);
 888 }
 889 #endif /* HAVE_SANDBOX_H */
 890
 891
 892 /*
 893  * End of "$Id: process.c 12471 2015-02-01 05:07:10Z msweet $".
 894  */