2 * "$Id: process.c 7256 2008-01-25 00:48:54Z mike $"
4 * Process management routines for the CUPS scheduler.
6 * Copyright 2007-2011 by Apple Inc.
7 * Copyright 1997-2007 by Easy Software Products, all rights reserved.
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/".
17 * cupsdCreateProfile() - Create an execution profile for a subprocess.
18 * cupsdDestroyProfile() - Delete an execution profile.
19 * cupsdEndProcess() - End a process.
20 * cupsdFinishProcess() - Finish a process and get its name.
21 * cupsdStartProcess() - Start a process.
22 * compare_procs() - Compare two processes.
23 * cupsd_requote() - Make a regular-expression version of a string.
27 * Include necessary headers...
34 #endif /* __APPLE__ */
38 * Process structure...
43 int pid
, /* Process ID */
44 job_id
; /* Job associated with process */
45 char name
[1]; /* Name of process */
53 static cups_array_t
*process_array
= NULL
;
60 static int compare_procs(cupsd_proc_t
*a
, cupsd_proc_t
*b
);
62 static char *cupsd_requote(char *dst
, const char *src
, size_t dstsize
);
63 #endif /* HAVE_SANDBOX_H */
67 * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
70 void * /* O - Profile or NULL on error */
71 cupsdCreateProfile(int job_id
) /* I - Job ID or 0 for none */
74 cups_file_t
*fp
; /* File pointer */
75 char profile
[1024], /* File containing the profile */
76 cache
[1024], /* Quoted CacheDir */
77 request
[1024], /* Quoted RequestRoot */
78 root
[1024], /* Quoted ServerRoot */
79 temp
[1024]; /* Quoted TempDir */
85 * Only use sandbox profiles as root...
88 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdCreateProfile(job_id=%d) = NULL",
94 if ((fp
= cupsTempFile2(profile
, sizeof(profile
))) == NULL
)
96 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdCreateProfile(job_id=%d) = NULL",
98 cupsdLogMessage(CUPSD_LOG_ERROR
, "Unable to create security profile: %s",
103 fchown(cupsFileNumber(fp
), RunUser
, Group
);
104 fchmod(cupsFileNumber(fp
), 0640);
106 cupsd_requote(cache
, CacheDir
, sizeof(cache
));
107 cupsd_requote(request
, RequestRoot
, sizeof(request
));
108 cupsd_requote(root
, ServerRoot
, sizeof(root
));
109 cupsd_requote(temp
, TempDir
, sizeof(temp
));
111 cupsFilePuts(fp
, "(version 1)\n");
112 if (LogLevel
>= CUPSD_LOG_DEBUG
)
113 cupsFilePuts(fp
, "(debug deny)\n");
114 cupsFilePuts(fp
, "(allow default)\n");
116 "(deny file-write* file-read-data file-read-metadata\n"
118 " #\"^%s$\"" /* RequestRoot */
119 " #\"^%s/\"" /* RequestRoot/... */
124 "(deny file-write* file-read-data file-read-metadata\n"
130 "(deny file-write*\n"
132 " #\"^%s$\"" /* ServerRoot */
133 " #\"^%s/\"" /* ServerRoot/... */
134 " #\"^/private/etc$\""
135 " #\"^/private/etc/\""
136 " #\"^/usr/local/etc$\""
137 " #\"^/usr/local/etc/\""
144 /* Specifically allow applications to stat RequestRoot */
146 "(allow file-read-metadata\n"
148 " #\"^%s$\"" /* RequestRoot */
152 "(allow file-write* file-read-data file-read-metadata\n"
154 " #\"^%s$\"" /* TempDir */
155 " #\"^%s/\"" /* TempDir/... */
156 " #\"^%s$\"" /* CacheDir */
157 " #\"^%s/\"" /* CacheDir/... */
158 " #\"^%s/Library$\"" /* RequestRoot/Library */
159 " #\"^%s/Library/\"" /* RequestRoot/Library/... */
160 " #\"^/Library/Application Support/\""
161 " #\"^/Library/Caches/\""
162 " #\"^/Library/Preferences/\""
163 " #\"^/Library/Printers/.*/\""
164 " #\"^/Users/Shared/\""
166 temp
, temp
, cache
, cache
, request
, request
);
168 "(deny file-write*\n"
170 " #\"^/Library/Printers/PPDs$\""
171 " #\"^/Library/Printers/PPDs/\""
172 " #\"^/Library/Printers/PPD Plugins$\""
173 " #\"^/Library/Printers/PPD Plugins/\""
178 * Allow job filters to read the spool file(s)...
182 "(allow file-read-data file-read-metadata\n"
183 " (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
184 request
, job_id
, job_id
);
189 * Allow email notifications from notifiers...
193 "(allow process-exec\n"
194 " (literal \"/usr/sbin/sendmail\")\n"
195 " (with no-sandbox)\n"
201 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdCreateProfile(job_id=%d) = \"%s\"",
203 return ((void *)strdup(profile
));
206 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdCreateProfile(job_id=%d) = NULL",
210 #endif /* HAVE_SANDBOX_H */
215 * 'cupsdDestroyProfile()' - Delete an execution profile.
219 cupsdDestroyProfile(void *profile
) /* I - Profile */
221 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdDeleteProfile(profile=\"%s\")",
222 profile
? (char *)profile
: "(null)");
224 #ifdef HAVE_SANDBOX_H
227 unlink((char *)profile
);
230 #endif /* HAVE_SANDBOX_H */
235 * 'cupsdEndProcess()' - End a process.
238 int /* O - 0 on success, -1 on failure */
239 cupsdEndProcess(int pid
, /* I - Process ID */
240 int force
) /* I - Force child to die */
242 cupsdLogMessage(CUPSD_LOG_DEBUG2
, "cupsdEndProcess(pid=%d, force=%d)", pid
,
248 return (kill(pid
, SIGKILL
));
250 return (kill(pid
, SIGTERM
));
255 * 'cupsdFinishProcess()' - Finish a process and get its name.
258 const char * /* O - Process name */
259 cupsdFinishProcess(int pid
, /* I - Process ID */
260 char *name
, /* I - Name buffer */
261 int namelen
, /* I - Size of name buffer */
262 int *job_id
) /* O - Job ID pointer or NULL */
264 cupsd_proc_t key
, /* Search key */
265 *proc
; /* Matching process */
270 if ((proc
= (cupsd_proc_t
*)cupsArrayFind(process_array
, &key
)) != NULL
)
273 *job_id
= proc
->job_id
;
275 strlcpy(name
, proc
->name
, namelen
);
276 cupsArrayRemove(process_array
, proc
);
284 strlcpy(name
, "unknown", namelen
);
287 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
288 "cupsdFinishProcess(pid=%d, name=%p, namelen=%d, "
289 "job_id=%p(%d)) = \"%s\"", pid
, name
, namelen
, job_id
,
290 job_id
? *job_id
: 0, name
);
297 * 'cupsdStartProcess()' - Start a process.
300 int /* O - Process ID or 0 */
302 const char *command
, /* I - Full path to command */
303 char *argv
[], /* I - Command-line arguments */
304 char *envp
[], /* I - Environment */
305 int infd
, /* I - Standard input file descriptor */
306 int outfd
, /* I - Standard output file descriptor */
307 int errfd
, /* I - Standard error file descriptor */
308 int backfd
, /* I - Backchannel file descriptor */
309 int sidefd
, /* I - Sidechannel file descriptor */
310 int root
, /* I - Run as root? */
311 void *profile
, /* I - Security profile to use */
312 cupsd_job_t
*job
, /* I - Job associated with process */
313 int *pid
) /* O - Process ID */
315 int i
; /* Looping var */
316 const char *exec_path
= command
; /* Command to be exec'd */
317 char *real_argv
[103], /* Real command-line arguments */
318 cups_exec
[1024]; /* Path to "cups-exec" program */
319 int user
; /* Command UID */
320 struct stat commandinfo
; /* Command file information */
321 cupsd_proc_t
*proc
; /* New process record */
322 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
323 struct sigaction action
; /* POSIX signal handler */
324 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
325 #if defined(__APPLE__)
326 char processPath
[1024], /* CFProcessPath environment variable */
327 linkpath
[1024]; /* Link path for symlinks... */
328 int linkbytes
; /* Bytes for link path */
329 #endif /* __APPLE__ */
333 * Figure out the UID for the child process...
344 * Check the permissions of the command we are running...
347 if (stat(command
, &commandinfo
))
351 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
352 "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
353 "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
354 "profile=%p, job=%p(%d), pid=%p) = %d",
355 command
, argv
, envp
, infd
, outfd
, errfd
, backfd
, sidefd
,
356 root
, profile
, job
, job
? job
->id
: 0, pid
, *pid
);
357 cupsdLogMessage(CUPSD_LOG_ERROR
,
358 "%s%s \"%s\" not available: %s",
359 job
&& job
->printer
? job
->printer
->name
: "",
360 job
&& job
->printer
? ": Printer driver" : "Program",
361 command
, strerror(errno
));
363 if (job
&& job
->printer
)
365 if (cupsdSetPrinterReasons(job
->printer
, "+cups-missing-filter-warning"))
366 cupsdAddEvent(CUPSD_EVENT_PRINTER_STATE
, job
->printer
, NULL
,
367 "Printer driver \"%s\" not available.", command
);
373 ((commandinfo
.st_mode
& (S_ISUID
| S_IWOTH
)) ||
378 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
379 "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
380 "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
381 "profile=%p, job=%p(%d), pid=%p) = %d",
382 command
, argv
, envp
, infd
, outfd
, errfd
, backfd
, sidefd
,
383 root
, profile
, job
, job
? job
->id
: 0, pid
, *pid
);
384 cupsdLogMessage(CUPSD_LOG_ERROR
,
385 "%s%s \"%s\" has insecure permissions (%d/0%o).",
386 job
&& job
->printer
? job
->printer
->name
: "",
387 job
&& job
->printer
? ": Printer driver" : "Program",
388 command
, (int)commandinfo
.st_uid
, commandinfo
.st_mode
);
390 if (job
&& job
->printer
)
392 if (cupsdSetPrinterReasons(job
->printer
, "+cups-insecure-filter-warning"))
393 cupsdAddEvent(CUPSD_EVENT_PRINTER_STATE
, job
->printer
, NULL
,
394 "Printer driver \"%s\" has insecure permissions "
395 "(%d/0%o).", command
,
396 (int)commandinfo
.st_uid
, commandinfo
.st_mode
);
403 else if ((commandinfo
.st_uid
!= user
|| !(commandinfo
.st_mode
& S_IXUSR
)) &&
404 (commandinfo
.st_gid
!= Group
|| !(commandinfo
.st_mode
& S_IXGRP
)) &&
405 !(commandinfo
.st_mode
& S_IXOTH
))
409 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
410 "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
411 "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
412 "profile=%p, job=%p(%d), pid=%p) = %d",
413 command
, argv
, envp
, infd
, outfd
, errfd
, backfd
, sidefd
,
414 root
, profile
, job
, job
? job
->id
: 0, pid
, *pid
);
415 cupsdLogMessage(CUPSD_LOG_ERROR
,
416 "%s%s \"%s\" does not have execute permissions (%d/0%o).",
417 job
&& job
->printer
? job
->printer
->name
: "",
418 job
&& job
->printer
? ": Printer driver" : "Program",
419 command
, (int)commandinfo
.st_uid
, commandinfo
.st_mode
);
424 else if (!RunUser
&& (commandinfo
.st_mode
& S_IWGRP
))
426 cupsdLogMessage(CUPSD_LOG_WARN
,
427 "%s%s \"%s\" has insecure permissions (%d/0%o).",
428 job
&& job
->printer
? job
->printer
->name
: "",
429 job
&& job
->printer
? ": Printer driver" : "Program",
430 command
, (int)commandinfo
.st_uid
, commandinfo
.st_mode
);
432 if (job
&& job
->printer
)
434 if (cupsdSetPrinterReasons(job
->printer
, "+cups-insecure-filter-warning"))
435 cupsdAddEvent(CUPSD_EVENT_PRINTER_STATE
, job
->printer
, NULL
,
436 "Printer driver \"%s\" has insecure permissions "
437 "(%d/0%o).", command
, (int)commandinfo
.st_uid
,
438 commandinfo
.st_mode
);
442 #if defined(__APPLE__)
446 * Add special voodoo magic for Mac OS X - this allows Mac OS X
447 * programs to access their bundle resources properly...
450 if ((linkbytes
= readlink(command
, linkpath
, sizeof(linkpath
) - 1)) > 0)
453 * Yes, this is a symlink to the actual program, nul-terminate and
457 linkpath
[linkbytes
] = '\0';
459 if (linkpath
[0] == '/')
460 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s",
463 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s/%s",
464 dirname((char *)command
), linkpath
);
467 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s", command
);
469 envp
[0] = processPath
; /* Replace <CFProcessPath> string */
471 #endif /* __APPLE__ */
474 * Use helper program when we have a sandbox profile...
479 snprintf(cups_exec
, sizeof(cups_exec
), "%s/daemon/cups-exec", ServerBin
);
481 real_argv
[0] = cups_exec
;
482 real_argv
[1] = profile
;
483 real_argv
[2] = (char *)command
;
486 i
< (int)(sizeof(real_argv
) / sizeof(real_argv
[0]) - 4) && argv
[i
];
488 real_argv
[i
+ 3] = argv
[i
];
490 real_argv
[i
+ 3] = NULL
;
493 exec_path
= cups_exec
;
497 * Block signals before forking...
502 if ((*pid
= fork()) == 0)
505 * Child process goes here...
507 * Update stdin/stdout/stderr as needed...
513 infd
= open("/dev/null", O_RDONLY
);
525 outfd
= open("/dev/null", O_WRONLY
);
537 errfd
= open("/dev/null", O_WRONLY
);
546 if (backfd
!= 3 && backfd
>= 0)
550 fcntl(3, F_SETFL
, O_NDELAY
);
553 if (sidefd
!= 4 && sidefd
>= 0)
557 fcntl(4, F_SETFL
, O_NDELAY
);
561 * Change the priority of the process based on the FilterNice setting.
562 * (this is not done for root processes...)
569 * Change user to something "safe"...
572 if (!root
&& !RunUser
)
575 * Running as root, so change to non-priviledged user...
581 if (setgroups(1, &Group
))
590 * Reset group membership to just the main one we belong to.
593 if (setgid(Group
) && !RunUser
)
596 if (setgroups(1, &Group
) && !RunUser
)
601 * Change umask to restrict permissions on created files...
607 * Unblock signals before doing the exec...
611 sigset(SIGTERM
, SIG_DFL
);
612 sigset(SIGCHLD
, SIG_DFL
);
613 sigset(SIGPIPE
, SIG_DFL
);
614 #elif defined(HAVE_SIGACTION)
615 memset(&action
, 0, sizeof(action
));
617 sigemptyset(&action
.sa_mask
);
618 action
.sa_handler
= SIG_DFL
;
620 sigaction(SIGTERM
, &action
, NULL
);
621 sigaction(SIGCHLD
, &action
, NULL
);
622 sigaction(SIGPIPE
, &action
, NULL
);
624 signal(SIGTERM
, SIG_DFL
);
625 signal(SIGCHLD
, SIG_DFL
);
626 signal(SIGPIPE
, SIG_DFL
);
627 #endif /* HAVE_SIGSET */
629 cupsdReleaseSignals();
632 * Execute the command; if for some reason this doesn't work, log an error
633 * exit with a non-zero value...
637 execve(exec_path
, argv
, envp
);
639 execv(exec_path
, argv
);
648 * Error - couldn't fork a new process!
651 cupsdLogMessage(CUPSD_LOG_ERROR
, "Unable to fork %s - %s.", command
,
659 process_array
= cupsArrayNew((cups_array_func_t
)compare_procs
, NULL
);
663 if ((proc
= calloc(1, sizeof(cupsd_proc_t
) + strlen(command
))) != NULL
)
666 proc
->job_id
= job
? job
->id
: 0;
667 _cups_strcpy(proc
->name
, command
);
669 cupsArrayAdd(process_array
, proc
);
674 cupsdReleaseSignals();
676 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
677 "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
678 "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
679 "profile=%p, job=%p(%d), pid=%p) = %d",
680 command
, argv
, envp
, infd
, outfd
, errfd
, backfd
, sidefd
,
681 root
, profile
, job
, job
? job
->id
: 0, pid
, *pid
);
688 * 'compare_procs()' - Compare two processes.
691 static int /* O - Result of comparison */
692 compare_procs(cupsd_proc_t
*a
, /* I - First process */
693 cupsd_proc_t
*b
) /* I - Second process */
695 return (a
->pid
- b
->pid
);
699 #ifdef HAVE_SANDBOX_H
701 * 'cupsd_requote()' - Make a regular-expression version of a string.
704 static char * /* O - Quoted string */
705 cupsd_requote(char *dst
, /* I - Destination buffer */
706 const char *src
, /* I - Source string */
707 size_t dstsize
) /* I - Size of destination buffer */
709 int ch
; /* Current character */
710 char *dstptr
, /* Current position in buffer */
711 *dstend
; /* End of destination buffer */
715 dstend
= dst
+ dstsize
- 2;
717 while (*src
&& dstptr
< dstend
)
721 if (strchr(".?*()[]^$\\", ch
))
731 #endif /* HAVE_SANDBOX_H */
735 * End of "$Id: process.c 7256 2008-01-25 00:48:54Z mike $".