scheduler/process.c

   1 /*
   2  * "$Id: process.c 12252 2014-11-14 17:14:45Z msweet $"
   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                         state[1024],    /* Quoted StateDir */
  77                         temp[1024];     /* Quoted TempDir */
  78   const char            *nodebug;       /* " (with no-log)" for no debug */
  79   cupsd_listener_t      *lis;           /* Current listening socket */
  80
  81
  82   if (!UseSandboxing || Sandboxing == CUPSD_SANDBOXING_OFF)
  83   {
  84    /*
  85     * Only use sandbox profiles as root...
  86     */
  87
  88     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  89
  90     return (NULL);
  91   }
  92
  93   if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
  94   {
  95     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  96     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s",
  97                     strerror(errno));
  98     return (NULL);
  99   }
 100
 101   fchown(cupsFileNumber(fp), RunUser, Group);
 102   fchmod(cupsFileNumber(fp), 0640);
 103
 104   cupsd_requote(bin, ServerBin, sizeof(bin));
 105   cupsd_requote(cache, CacheDir, sizeof(cache));
 106   cupsd_requote(request, RequestRoot, sizeof(request));
 107   cupsd_requote(root, ServerRoot, sizeof(root));
 108   cupsd_requote(state, StateDir, sizeof(state));
 109   cupsd_requote(temp, TempDir, sizeof(temp));
 110
 111   nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
 112
 113   cupsFilePuts(fp, "(version 1)\n");
 114   if (Sandboxing == CUPSD_SANDBOXING_STRICT)
 115     cupsFilePuts(fp, "(deny default)\n");
 116   else
 117     cupsFilePuts(fp, "(allow default)\n");
 118   if (LogLevel >= CUPSD_LOG_DEBUG)
 119     cupsFilePuts(fp, "(debug deny)\n");
 120   cupsFilePuts(fp, "(import \"system.sb\")\n");
 121   cupsFilePuts(fp, "(system-network)\n");
 122   cupsFilePuts(fp, "(allow mach-per-user-lookup)\n");
 123   cupsFilePuts(fp, "(allow ipc-posix-sem)\n");
 124   cupsFilePuts(fp, "(allow ipc-posix-shm)\n");
 125   cupsFilePuts(fp, "(allow ipc-sysv-shm)\n");
 126   cupsFilePuts(fp, "(allow mach-lookup)\n");
 127   if (!RunUser)
 128     cupsFilePrintf(fp,
 129                    "(deny file-write* file-read-data file-read-metadata\n"
 130                    "  (regex"
 131                    " #\"^/Users$\""
 132                    " #\"^/Users/\""
 133                    ")%s)\n", nodebug);
 134   cupsFilePrintf(fp,
 135                  "(deny file-write*\n"
 136                  "  (regex"
 137                  " #\"^%s$\""           /* ServerRoot */
 138                  " #\"^%s/\""           /* ServerRoot/... */
 139                  " #\"^/private/etc$\""
 140                  " #\"^/private/etc/\""
 141                  " #\"^/usr/local/etc$\""
 142                  " #\"^/usr/local/etc/\""
 143                  " #\"^/Library$\""
 144                  " #\"^/Library/\""
 145                  " #\"^/System$\""
 146                  " #\"^/System/\""
 147                  ")%s)\n",
 148                  root, root, nodebug);
 149   /* Specifically allow applications to stat RequestRoot and some other system folders */
 150   cupsFilePrintf(fp,
 151                  "(allow file-read-metadata\n"
 152                  "  (regex"
 153                  " #\"^/$\""            /* / */
 154                  " #\"^/usr$\""         /* /usr */
 155                  " #\"^/Library$\""     /* /Library */
 156                  " #\"^/Library/Printers$\""    /* /Library/Printers */
 157                  " #\"^%s$\""           /* RequestRoot */
 158                  "))\n",
 159                  request);
 160   /* Read and write TempDir, CacheDir, and other common folders */
 161   cupsFilePuts(fp,
 162                "(allow file-write* file-read-data file-read-metadata\n"
 163                "  (regex"
 164                " #\"^/private/var/db/\""
 165                " #\"^/private/var/folders/\""
 166                " #\"^/private/var/lib/\""
 167                " #\"^/private/var/log/\""
 168                " #\"^/private/var/mysql/\""
 169                " #\"^/private/var/run/\""
 170                " #\"^/private/var/spool/\""
 171                " #\"^/Library/Application Support/\""
 172                " #\"^/Library/Caches/\""
 173                " #\"^/Library/Logs/\""
 174                " #\"^/Library/Preferences/\""
 175                " #\"^/Library/WebServer/\""
 176                " #\"^/Users/Shared/\""
 177                "))\n");
 178   cupsFilePrintf(fp,
 179                  "(deny file-write*\n"
 180                  "       (regex #\"^%s$\")%s)\n",
 181                  request, nodebug);
 182   cupsFilePrintf(fp,
 183                  "(deny file-write* file-read-data file-read-metadata\n"
 184                  "       (regex #\"^%s/\")%s)\n",
 185                  request, nodebug);
 186   cupsFilePrintf(fp,
 187                  "(allow file-write* file-read-data file-read-metadata\n"
 188                  "  (regex"
 189                  " #\"^%s$\""           /* TempDir */
 190                  " #\"^%s/\""           /* TempDir/... */
 191                  " #\"^%s$\""           /* CacheDir */
 192                  " #\"^%s/\""           /* CacheDir/... */
 193                  " #\"^%s$\""           /* StateDir */
 194                  " #\"^%s/\""           /* StateDir/... */
 195                  "))\n",
 196                  temp, temp, cache, cache, state, state);
 197   /* Read common folders */
 198   cupsFilePrintf(fp,
 199                  "(allow file-read-data file-read-metadata\n"
 200                  "  (regex"
 201                  " #\"^/AppleInternal$\""
 202                  " #\"^/AppleInternal/\""
 203                  " #\"^/bin$\""         /* /bin */
 204                  " #\"^/bin/\""         /* /bin/... */
 205                  " #\"^/private$\""
 206                  " #\"^/private/etc$\""
 207                  " #\"^/private/etc/\""
 208                  " #\"^/private/tmp$\""
 209                  " #\"^/private/tmp/\""
 210                  " #\"^/private/var$\""
 211                  " #\"^/private/var/db$\""
 212                  " #\"^/private/var/folders$\""
 213                  " #\"^/private/var/lib$\""
 214                  " #\"^/private/var/log$\""
 215                  " #\"^/private/var/mysql$\""
 216                  " #\"^/private/var/run$\""
 217                  " #\"^/private/var/spool$\""
 218                  " #\"^/private/var/tmp$\""
 219                  " #\"^/private/var/tmp/\""
 220                  " #\"^/usr/bin$\""     /* /usr/bin */
 221                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 222                  " #\"^/usr/libexec/cups$\""    /* /usr/libexec/cups */
 223                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 224                  " #\"^/usr/libexec/fax$\""     /* /usr/libexec/fax */
 225                  " #\"^/usr/libexec/fax/\""     /* /usr/libexec/fax/... */
 226                  " #\"^/usr/sbin$\""    /* /usr/sbin */
 227                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 228                  " #\"^/Library$\""     /* /Library */
 229                  " #\"^/Library/\""     /* /Library/... */
 230                  " #\"^/System$\""      /* /System */
 231                  " #\"^/System/\""      /* /System/... */
 232                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 233                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 234                  " #\"^%s$\""           /* ServerBin */
 235                  " #\"^%s/\""           /* ServerBin/... */
 236                  " #\"^%s$\""           /* ServerRoot */
 237                  " #\"^%s/\""           /* ServerRoot/... */
 238                  "))\n",
 239                  request, request, bin, bin, root, root);
 240   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 241   {
 242     /* Limited write access to /Library/Printers/... */
 243     cupsFilePuts(fp,
 244                  "(allow file-write*\n"
 245                  "  (regex"
 246                  " #\"^/Library/Printers/.*/\""
 247                  "))\n");
 248     cupsFilePrintf(fp,
 249                    "(deny file-write*\n"
 250                    "  (regex"
 251                    " #\"^/Library/Printers/PPDs$\""
 252                    " #\"^/Library/Printers/PPDs/\""
 253                    " #\"^/Library/Printers/PPD Plugins$\""
 254                    " #\"^/Library/Printers/PPD Plugins/\""
 255                    ")%s)\n", nodebug);
 256   }
 257   /* Allow execution of child processes as long as the programs are not in a user directory */
 258   cupsFilePuts(fp, "(allow process*)\n");
 259   cupsFilePuts(fp, "(deny process-exec (regex #\"^/Users/\"))\n");
 260   if (RunUser && getenv("CUPS_TESTROOT"))
 261   {
 262     /* Allow source directory access in "make test" environment */
 263     char        testroot[1024];         /* Root directory of test files */
 264
 265     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 266
 267     cupsFilePrintf(fp,
 268                    "(allow file-write* file-read-data file-read-metadata\n"
 269                    "  (regex"
 270                    " #\"^%s$\""         /* CUPS_TESTROOT */
 271                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 272                    "))\n",
 273                    testroot, testroot);
 274     cupsFilePrintf(fp,
 275                    "(allow process-exec\n"
 276                    "  (regex"
 277                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 278                    "))\n",
 279                    testroot);
 280     cupsFilePrintf(fp, "(allow sysctl*)\n");
 281   }
 282   if (job_id)
 283   {
 284     /* Allow job filters to read the current job files... */
 285     cupsFilePrintf(fp,
 286                    "(allow file-read-data file-read-metadata\n"
 287                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 288                    request, job_id, job_id);
 289   }
 290   else
 291   {
 292     /* Allow email notifications from notifiers... */
 293     cupsFilePuts(fp,
 294                  "(allow process-exec\n"
 295                  "  (literal \"/usr/sbin/sendmail\")\n"
 296                  "  (with no-sandbox))\n");
 297   }
 298   /* Allow access to Bluetooth, USB, and notify_post. */
 299   cupsFilePuts(fp, "(allow iokit*)\n");
 300   cupsFilePuts(fp, "(allow distributed-notification-post)\n");
 301   /* Allow outbound networking to local services */
 302   cupsFilePuts(fp, "(allow network-outbound"
 303                    "\n       (regex #\"^/private/var/run/\" #\"^/private/tmp/\" #\"^/private/var/tmp/\")");
 304   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 305        lis;
 306        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 307   {
 308     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 309     {
 310       httpAddrString(&(lis->address), domain, sizeof(domain));
 311       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 312     }
 313   }
 314   if (allow_networking)
 315   {
 316     /* Allow TCP and UDP networking off the machine... */
 317     cupsFilePuts(fp, "\n       (remote tcp))\n");
 318     cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */
 319     cupsFilePuts(fp, "(allow network*\n"
 320                      "       (local udp \"*:*\")\n"
 321                      "       (remote udp \"*:*\"))\n");
 322
 323     /* Also allow access to device files... */
 324     cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n"
 325                      "       (regex #\"^/dev/\"))\n");
 326   }
 327   else
 328   {
 329     /* Only allow SNMP (UDP) and LPD (TCP) off the machine... */
 330     cupsFilePuts(fp, ")\n");
 331     cupsFilePuts(fp, "(allow network-outbound\n"
 332                      "       (remote udp \"*:161\")"
 333                      "       (remote tcp \"*:515\"))\n");
 334     cupsFilePuts(fp, "(allow network-inbound\n"
 335                      "       (local udp \"localhost:*\"))\n");
 336   }
 337   cupsFileClose(fp);
 338
 339   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 340   return ((void *)strdup(profile));
 341
 342 #else
 343   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 344
 345   return (NULL);
 346 #endif /* HAVE_SANDBOX_H */
 347 }
 348
 349
 350 /*
 351  * 'cupsdDestroyProfile()' - Delete an execution profile.
 352  */
 353
 354 void
 355 cupsdDestroyProfile(void *profile)      /* I - Profile */
 356 {
 357   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 358                   profile ? (char *)profile : "(null)");
 359
 360 #ifdef HAVE_SANDBOX_H
 361   if (profile)
 362   {
 363     unlink((char *)profile);
 364     free(profile);
 365   }
 366 #endif /* HAVE_SANDBOX_H */
 367 }
 368
 369
 370 /*
 371  * 'cupsdEndProcess()' - End a process.
 372  */
 373
 374 int                                     /* O - 0 on success, -1 on failure */
 375 cupsdEndProcess(int pid,                /* I - Process ID */
 376                 int force)              /* I - Force child to die */
 377 {
 378   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 379                   force);
 380
 381   if (!pid)
 382     return (0);
 383
 384   if (!RunUser)
 385   {
 386    /*
 387     * When running as root, cupsd puts child processes in their own process
 388     * group.  Using "-pid" sends a signal to all processes in the group.
 389     */
 390
 391     pid = -pid;
 392   }
 393
 394   if (force)
 395     return (kill(pid, SIGKILL));
 396   else
 397     return (kill(pid, SIGTERM));
 398 }
 399
 400
 401 /*
 402  * 'cupsdFinishProcess()' - Finish a process and get its name.
 403  */
 404
 405 const char *                            /* O - Process name */
 406 cupsdFinishProcess(int    pid,          /* I - Process ID */
 407                    char   *name,        /* I - Name buffer */
 408                    size_t namelen,      /* I - Size of name buffer */
 409                    int    *job_id)      /* O - Job ID pointer or NULL */
 410 {
 411   cupsd_proc_t  key,                    /* Search key */
 412                 *proc;                  /* Matching process */
 413
 414
 415   key.pid = pid;
 416
 417   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 418   {
 419     if (job_id)
 420       *job_id = proc->job_id;
 421
 422     strlcpy(name, proc->name, namelen);
 423     cupsArrayRemove(process_array, proc);
 424     free(proc);
 425   }
 426   else
 427   {
 428     if (job_id)
 429       *job_id = 0;
 430
 431     strlcpy(name, "unknown", namelen);
 432   }
 433
 434   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);
 435
 436   return (name);
 437 }
 438
 439
 440 /*
 441  * 'cupsdStartProcess()' - Start a process.
 442  */
 443
 444 int                                     /* O - Process ID or 0 */
 445 cupsdStartProcess(
 446     const char  *command,               /* I - Full path to command */
 447     char        *argv[],                /* I - Command-line arguments */
 448     char        *envp[],                /* I - Environment */
 449     int         infd,                   /* I - Standard input file descriptor */
 450     int         outfd,                  /* I - Standard output file descriptor */
 451     int         errfd,                  /* I - Standard error file descriptor */
 452     int         backfd,                 /* I - Backchannel file descriptor */
 453     int         sidefd,                 /* I - Sidechannel file descriptor */
 454     int         root,                   /* I - Run as root? */
 455     void        *profile,               /* I - Security profile to use */
 456     cupsd_job_t *job,                   /* I - Job associated with process */
 457     int         *pid)                   /* O - Process ID */
 458 {
 459   int           i;                      /* Looping var */
 460   const char    *exec_path = command;   /* Command to be exec'd */
 461   char          *real_argv[110],        /* Real command-line arguments */
 462                 cups_exec[1024],        /* Path to "cups-exec" program */
 463                 user_str[16],           /* User string */
 464                 group_str[16],          /* Group string */
 465                 nice_str[16];           /* FilterNice string */
 466   uid_t         user;                   /* Command UID */
 467   cupsd_proc_t  *proc;                  /* New process record */
 468 #if defined(HAVE_POSIX_SPAWN) && !defined(__OpenBSD__)
 469   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 470   posix_spawnattr_t attrs;              /* Spawn attributes */
 471   sigset_t      defsignals;             /* Default signals */
 472 #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 473   struct sigaction action;              /* POSIX signal handler */
 474 #endif /* HAVE_POSIX_SPAWN && !__OpenBSD__ */
 475 #if defined(__APPLE__)
 476   char          processPath[1024],      /* CFProcessPath environment variable */
 477                 linkpath[1024];         /* Link path for symlinks... */
 478   int           linkbytes;              /* Bytes for link path */
 479 #endif /* __APPLE__ */
 480
 481
 482   *pid = 0;
 483
 484  /*
 485   * Figure out the UID for the child process...
 486   */
 487
 488   if (RunUser)
 489     user = RunUser;
 490   else if (root)
 491     user = 0;
 492   else
 493     user = User;
 494
 495  /*
 496   * Check the permissions of the command we are running...
 497   */
 498
 499   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 500                      cupsdLogFCMessage, job ? job->printer : NULL))
 501     return (0);
 502
 503 #if defined(__APPLE__)
 504   if (envp)
 505   {
 506    /*
 507     * Add special voodoo magic for OS X - this allows OS X programs to access
 508     * their bundle resources properly...
 509     */
 510
 511     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 512     {
 513      /*
 514       * Yes, this is a symlink to the actual program, nul-terminate and
 515       * use it...
 516       */
 517
 518       linkpath[linkbytes] = '\0';
 519
 520       if (linkpath[0] == '/')
 521         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 522                  linkpath);
 523       else
 524         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 525                  dirname((char *)command), linkpath);
 526     }
 527     else
 528       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 529
 530     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 531   }
 532 #endif  /* __APPLE__ */
 533
 534  /*
 535   * Use helper program when we have a sandbox profile...
 536   */
 537
 538 #if !defined(HAVE_POSIX_SPAWN) || defined(__OpenBSD__)
 539   if (profile)
 540 #endif /* !HAVE_POSIX_SPAWN || __OpenBSD__ */
 541   {
 542     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 543     snprintf(user_str, sizeof(user_str), "%d", user);
 544     snprintf(group_str, sizeof(group_str), "%d", Group);
 545     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 546
 547     real_argv[0] = cups_exec;
 548     real_argv[1] = (char *)"-g";
 549     real_argv[2] = group_str;
 550     real_argv[3] = (char *)"-n";
 551     real_argv[4] = nice_str;
 552     real_argv[5] = (char *)"-u";
 553     real_argv[6] = user_str;
 554     real_argv[7] = profile ? profile : "none";
 555     real_argv[8] = (char *)command;
 556
 557     for (i = 0;
 558          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 559          i ++)
 560       real_argv[i + 9] = argv[i];
 561
 562     real_argv[i + 9] = NULL;
 563
 564     argv      = real_argv;
 565     exec_path = cups_exec;
 566   }
 567
 568   if (LogLevel == CUPSD_LOG_DEBUG2)
 569   {
 570     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 571
 572     for (i = 0; argv[i]; i ++)
 573       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 574   }
 575
 576 #if defined(HAVE_POSIX_SPAWN) && !defined(__OpenBSD__) /* OpenBSD posix_spawn is busted with SETSIGDEF */
 577  /*
 578   * Setup attributes and file actions for the spawn...
 579   */
 580
 581   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 582   sigemptyset(&defsignals);
 583   sigaddset(&defsignals, SIGTERM);
 584   sigaddset(&defsignals, SIGCHLD);
 585   sigaddset(&defsignals, SIGPIPE);
 586
 587   posix_spawnattr_init(&attrs);
 588   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 589   posix_spawnattr_setpgroup(&attrs, 0);
 590   posix_spawnattr_setsigdefault(&attrs, &defsignals);
 591
 592   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 593   posix_spawn_file_actions_init(&actions);
 594   if (infd != 0)
 595   {
 596     if (infd < 0)
 597       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 598     else
 599       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 600   }
 601
 602   if (outfd != 1)
 603   {
 604     if (outfd < 0)
 605       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 606     else
 607       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 608   }
 609
 610   if (errfd != 2)
 611   {
 612     if (errfd < 0)
 613       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 614     else
 615       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 616   }
 617
 618   if (backfd != 3 && backfd >= 0)
 619     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 620
 621   if (sidefd != 4 && sidefd >= 0)
 622     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 623
 624   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 625
 626   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 627   {
 628     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 629
 630     *pid = 0;
 631   }
 632   else
 633     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 634
 635   posix_spawn_file_actions_destroy(&actions);
 636   posix_spawnattr_destroy(&attrs);
 637
 638 #else
 639  /*
 640   * Block signals before forking...
 641   */
 642
 643   cupsdHoldSignals();
 644
 645   if ((*pid = fork()) == 0)
 646   {
 647    /*
 648     * Child process goes here; update stderr as needed...
 649     */
 650
 651     if (errfd != 2)
 652     {
 653       if (errfd < 0)
 654         errfd = open("/dev/null", O_WRONLY);
 655
 656       if (errfd != 2)
 657       {
 658         dup2(errfd, 2);
 659         close(errfd);
 660       }
 661     }
 662
 663    /*
 664     * Put this process in its own process group so that we can kill any child
 665     * processes it creates.
 666     */
 667
 668 #  ifdef HAVE_SETPGID
 669     if (!RunUser && setpgid(0, 0))
 670       exit(errno + 100);
 671 #  else
 672     if (!RunUser && setpgrp())
 673       exit(errno + 100);
 674 #  endif /* HAVE_SETPGID */
 675
 676    /*
 677     * Update the remaining file descriptors as needed...
 678     */
 679
 680     if (infd != 0)
 681     {
 682       if (infd < 0)
 683         infd = open("/dev/null", O_RDONLY);
 684
 685       if (infd != 0)
 686       {
 687         dup2(infd, 0);
 688         close(infd);
 689       }
 690     }
 691
 692     if (outfd != 1)
 693     {
 694       if (outfd < 0)
 695         outfd = open("/dev/null", O_WRONLY);
 696
 697       if (outfd != 1)
 698       {
 699         dup2(outfd, 1);
 700         close(outfd);
 701       }
 702     }
 703
 704     if (backfd != 3 && backfd >= 0)
 705     {
 706       dup2(backfd, 3);
 707       close(backfd);
 708       fcntl(3, F_SETFL, O_NDELAY);
 709     }
 710
 711     if (sidefd != 4 && sidefd >= 0)
 712     {
 713       dup2(sidefd, 4);
 714       close(sidefd);
 715       fcntl(4, F_SETFL, O_NDELAY);
 716     }
 717
 718    /*
 719     * Change the priority of the process based on the FilterNice setting.
 720     * (this is not done for root processes...)
 721     */
 722
 723     if (!root)
 724       nice(FilterNice);
 725
 726    /*
 727     * Reset group membership to just the main one we belong to.
 728     */
 729
 730     if (!RunUser && setgid(Group))
 731       exit(errno + 100);
 732
 733     if (!RunUser && setgroups(1, &Group))
 734       exit(errno + 100);
 735
 736    /*
 737     * Change user to something "safe"...
 738     */
 739
 740     if (!RunUser && user && setuid(user))
 741       exit(errno + 100);
 742
 743    /*
 744     * Change umask to restrict permissions on created files...
 745     */
 746
 747     umask(077);
 748
 749    /*
 750     * Unblock signals before doing the exec...
 751     */
 752
 753 #  ifdef HAVE_SIGSET
 754     sigset(SIGTERM, SIG_DFL);
 755     sigset(SIGCHLD, SIG_DFL);
 756     sigset(SIGPIPE, SIG_DFL);
 757 #  elif defined(HAVE_SIGACTION)
 758     memset(&action, 0, sizeof(action));
 759
 760     sigemptyset(&action.sa_mask);
 761     action.sa_handler = SIG_DFL;
 762
 763     sigaction(SIGTERM, &action, NULL);
 764     sigaction(SIGCHLD, &action, NULL);
 765     sigaction(SIGPIPE, &action, NULL);
 766 #  else
 767     signal(SIGTERM, SIG_DFL);
 768     signal(SIGCHLD, SIG_DFL);
 769     signal(SIGPIPE, SIG_DFL);
 770 #  endif /* HAVE_SIGSET */
 771
 772     cupsdReleaseSignals();
 773
 774    /*
 775     * Execute the command; if for some reason this doesn't work, log an error
 776     * exit with a non-zero value...
 777     */
 778
 779     if (envp)
 780       execve(exec_path, argv, envp);
 781     else
 782       execv(exec_path, argv);
 783
 784     exit(errno + 100);
 785   }
 786   else if (*pid < 0)
 787   {
 788    /*
 789     * Error - couldn't fork a new process!
 790     */
 791
 792     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 793                     strerror(errno));
 794
 795     *pid = 0;
 796   }
 797
 798   cupsdReleaseSignals();
 799 #endif /* HAVE_POSIX_SPAWN && !__OpenBSD__ */
 800
 801   if (*pid)
 802   {
 803     if (!process_array)
 804       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 805
 806     if (process_array)
 807     {
 808       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 809       {
 810         proc->pid    = *pid;
 811         proc->job_id = job ? job->id : 0;
 812         _cups_strcpy(proc->name, command);
 813
 814         cupsArrayAdd(process_array, proc);
 815       }
 816     }
 817   }
 818
 819   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 820                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 821                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 822                   "profile=%p, job=%p(%d), pid=%p) = %d",
 823                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 824                   root, profile, job, job ? job->id : 0, pid, *pid);
 825
 826   return (*pid);
 827 }
 828
 829
 830 /*
 831  * 'compare_procs()' - Compare two processes.
 832  */
 833
 834 static int                              /* O - Result of comparison */
 835 compare_procs(cupsd_proc_t *a,          /* I - First process */
 836               cupsd_proc_t *b)          /* I - Second process */
 837 {
 838   return (a->pid - b->pid);
 839 }
 840
 841
 842 #ifdef HAVE_SANDBOX_H
 843 /*
 844  * 'cupsd_requote()' - Make a regular-expression version of a string.
 845  */
 846
 847 static char *                           /* O - Quoted string */
 848 cupsd_requote(char       *dst,          /* I - Destination buffer */
 849               const char *src,          /* I - Source string */
 850               size_t     dstsize)       /* I - Size of destination buffer */
 851 {
 852   int   ch;                             /* Current character */
 853   char  *dstptr,                        /* Current position in buffer */
 854         *dstend;                        /* End of destination buffer */
 855
 856
 857   dstptr = dst;
 858   dstend = dst + dstsize - 2;
 859
 860   while (*src && dstptr < dstend)
 861   {
 862     ch = *src++;
 863
 864     if (ch == '/' && !*src)
 865       break;                            /* Don't add trailing slash */
 866
 867     if (strchr(".?*()[]^$\\", ch))
 868       *dstptr++ = '\\';
 869
 870     *dstptr++ = (char)ch;
 871   }
 872
 873   *dstptr = '\0';
 874
 875   return (dst);
 876 }
 877 #endif /* HAVE_SANDBOX_H */
 878
 879
 880 /*
 881  * End of "$Id: process.c 12252 2014-11-14 17:14:45Z msweet $".
 882  */