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