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Commit | Line | Data |
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ef416fc2 | 1 | /* |
f2d18633 | 2 | * "$Id$" |
ef416fc2 | 3 | * |
7e86f2f6 | 4 | * Process management routines for the CUPS scheduler. |
ef416fc2 | 5 | * |
20529d53 | 6 | * Copyright 2007-2015 by Apple Inc. |
7e86f2f6 | 7 | * Copyright 1997-2007 by Easy Software Products, all rights reserved. |
ef416fc2 | 8 | * |
7e86f2f6 MS |
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/". | |
ef416fc2 | 14 | */ |
15 | ||
16 | /* | |
17 | * Include necessary headers... | |
18 | */ | |
19 | ||
20 | #include "cupsd.h" | |
21 | #include <grp.h> | |
a4924f6c | 22 | #ifdef __APPLE__ |
4400e98d | 23 | # include <libgen.h> |
6d2f911b | 24 | #endif /* __APPLE__ */ |
c82f05ea MS |
25 | #ifdef HAVE_POSIX_SPAWN |
26 | # include <spawn.h> | |
27 | extern char **environ; | |
28 | #endif /* HAVE_POSIX_SPAWN */ | |
a7616fe8 MS |
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 */ | |
ef416fc2 | 38 | |
39 | ||
e00b005a | 40 | /* |
41 | * Process structure... | |
42 | */ | |
43 | ||
44 | typedef struct | |
45 | { | |
b9faaae1 MS |
46 | int pid, /* Process ID */ |
47 | job_id; /* Job associated with process */ | |
e00b005a | 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); | |
a4924f6c MS |
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 */ | |
8fe0183a MS |
74 | cupsdCreateProfile(int job_id, /* I - Job ID or 0 for none */ |
75 | int allow_networking)/* I - Allow networking off machine? */ | |
a4924f6c MS |
76 | { |
77 | #ifdef HAVE_SANDBOX_H | |
8fe0183a MS |
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 */ | |
6c2b2b19 | 85 | state[1024], /* Quoted StateDir */ |
8fe0183a MS |
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) | |
b9faaae1 MS |
92 | { |
93 | /* | |
94 | * Only use sandbox profiles as root... | |
95 | */ | |
96 | ||
8fe0183a | 97 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
b9faaae1 MS |
98 | |
99 | return (NULL); | |
100 | } | |
101 | ||
a4924f6c MS |
102 | if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL) |
103 | { | |
8fe0183a | 104 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
a4924f6c MS |
105 | cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s", |
106 | strerror(errno)); | |
107 | return (NULL); | |
108 | } | |
109 | ||
0268488e MS |
110 | fchown(cupsFileNumber(fp), RunUser, Group); |
111 | fchmod(cupsFileNumber(fp), 0640); | |
112 | ||
8fe0183a | 113 | cupsd_requote(bin, ServerBin, sizeof(bin)); |
a4924f6c MS |
114 | cupsd_requote(cache, CacheDir, sizeof(cache)); |
115 | cupsd_requote(request, RequestRoot, sizeof(request)); | |
116 | cupsd_requote(root, ServerRoot, sizeof(root)); | |
6c2b2b19 | 117 | cupsd_requote(state, StateDir, sizeof(state)); |
a4924f6c MS |
118 | cupsd_requote(temp, TempDir, sizeof(temp)); |
119 | ||
88f9aafc MS |
120 | nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : ""; |
121 | ||
a4924f6c | 122 | cupsFilePuts(fp, "(version 1)\n"); |
8fe0183a MS |
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"); | |
0268488e | 136 | if (!RunUser) |
88f9aafc MS |
137 | cupsFilePrintf(fp, |
138 | "(deny file-write* file-read-data file-read-metadata\n" | |
139 | " (regex" | |
140 | " #\"^/Users$\"" | |
141 | " #\"^/Users/\"" | |
142 | ")%s)\n", nodebug); | |
a4924f6c MS |
143 | cupsFilePrintf(fp, |
144 | "(deny file-write*\n" | |
5a6b583a MS |
145 | " (regex" |
146 | " #\"^%s$\"" /* 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/\"" | |
88f9aafc MS |
156 | ")%s)\n", |
157 | root, root, nodebug); | |
8fe0183a | 158 | /* Specifically allow applications to stat RequestRoot and some other system folders */ |
7cf5915e MS |
159 | cupsFilePrintf(fp, |
160 | "(allow file-read-metadata\n" | |
161 | " (regex" | |
8fe0183a MS |
162 | " #\"^/$\"" /* / */ |
163 | " #\"^/usr$\"" /* /usr */ | |
164 | " #\"^/Library$\"" /* /Library */ | |
165 | " #\"^/Library/Printers$\"" /* /Library/Printers */ | |
7cf5915e MS |
166 | " #\"^%s$\"" /* RequestRoot */ |
167 | "))\n", | |
168 | request); | |
8fe0183a | 169 | /* Read and write TempDir, CacheDir, and other common folders */ |
84465c7c MS |
170 | cupsFilePuts(fp, |
171 | "(allow file-write* file-read-data file-read-metadata\n" | |
172 | " (regex" | |
173 | " #\"^/private/var/db/\"" | |
174 | " #\"^/private/var/folders/\"" | |
175 | " #\"^/private/var/lib/\"" | |
176 | " #\"^/private/var/log/\"" | |
177 | " #\"^/private/var/mysql/\"" | |
178 | " #\"^/private/var/run/\"" | |
179 | " #\"^/private/var/spool/\"" | |
180 | " #\"^/Library/Application Support/\"" | |
181 | " #\"^/Library/Caches/\"" | |
182 | " #\"^/Library/Logs/\"" | |
183 | " #\"^/Library/Preferences/\"" | |
184 | " #\"^/Library/WebServer/\"" | |
185 | " #\"^/Users/Shared/\"" | |
186 | "))\n"); | |
187 | cupsFilePrintf(fp, | |
188 | "(deny file-write*\n" | |
189 | " (regex #\"^%s$\")%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); | |
a4924f6c MS |
195 | cupsFilePrintf(fp, |
196 | "(allow file-write* file-read-data file-read-metadata\n" | |
5a6b583a MS |
197 | " (regex" |
198 | " #\"^%s$\"" /* TempDir */ | |
199 | " #\"^%s/\"" /* TempDir/... */ | |
200 | " #\"^%s$\"" /* CacheDir */ | |
201 | " #\"^%s/\"" /* CacheDir/... */ | |
6c2b2b19 MS |
202 | " #\"^%s$\"" /* StateDir */ |
203 | " #\"^%s/\"" /* StateDir/... */ | |
ed6e7faf | 204 | "))\n", |
6c2b2b19 | 205 | temp, temp, cache, cache, state, state); |
8fe0183a | 206 | /* Read common folders */ |
88f9aafc | 207 | cupsFilePrintf(fp, |
8fe0183a | 208 | "(allow file-read-data file-read-metadata\n" |
8fe0183a | 209 | " (regex" |
bcc4b655 MS |
210 | " #\"^/AppleInternal$\"" |
211 | " #\"^/AppleInternal/\"" | |
8fe0183a MS |
212 | " #\"^/bin$\"" /* /bin */ |
213 | " #\"^/bin/\"" /* /bin/... */ | |
777e09f8 | 214 | " #\"^/private$\"" |
d9183105 MS |
215 | " #\"^/private/etc$\"" |
216 | " #\"^/private/etc/\"" | |
1d8db48d MS |
217 | " #\"^/private/tmp$\"" |
218 | " #\"^/private/tmp/\"" | |
777e09f8 MS |
219 | " #\"^/private/var$\"" |
220 | " #\"^/private/var/db$\"" | |
d9183105 | 221 | " #\"^/private/var/folders$\"" |
99328a65 MS |
222 | " #\"^/private/var/lib$\"" |
223 | " #\"^/private/var/log$\"" | |
224 | " #\"^/private/var/mysql$\"" | |
1d8db48d | 225 | " #\"^/private/var/run$\"" |
777e09f8 | 226 | " #\"^/private/var/spool$\"" |
59aa4944 MS |
227 | " #\"^/private/var/tmp$\"" |
228 | " #\"^/private/var/tmp/\"" | |
8fe0183a MS |
229 | " #\"^/usr/bin$\"" /* /usr/bin */ |
230 | " #\"^/usr/bin/\"" /* /usr/bin/... */ | |
231 | " #\"^/usr/libexec/cups$\"" /* /usr/libexec/cups */ | |
232 | " #\"^/usr/libexec/cups/\"" /* /usr/libexec/cups/... */ | |
3f4342fa MS |
233 | " #\"^/usr/libexec/fax$\"" /* /usr/libexec/fax */ |
234 | " #\"^/usr/libexec/fax/\"" /* /usr/libexec/fax/... */ | |
8fe0183a MS |
235 | " #\"^/usr/sbin$\"" /* /usr/sbin */ |
236 | " #\"^/usr/sbin/\"" /* /usr/sbin/... */ | |
59aa4944 MS |
237 | " #\"^/Library$\"" /* /Library */ |
238 | " #\"^/Library/\"" /* /Library/... */ | |
239 | " #\"^/System$\"" /* /System */ | |
240 | " #\"^/System/\"" /* /System/... */ | |
8fe0183a MS |
241 | " #\"^%s/Library$\"" /* 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" | |
88f9aafc | 254 | " (regex" |
8fe0183a MS |
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 | } | |
a94fe6cf MS |
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"); | |
8fe0183a | 269 | if (RunUser && getenv("CUPS_TESTROOT")) |
e60ec91f | 270 | { |
8fe0183a MS |
271 | /* Allow source directory access in "make test" environment */ |
272 | char testroot[1024]; /* Root directory of test files */ | |
e60ec91f | 273 | |
8fe0183a MS |
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$\"" /* CUPS_TESTROOT */ | |
280 | " #\"^%s/\"" /* CUPS_TESTROOT/... */ | |
281 | "))\n", | |
282 | testroot, testroot); | |
283 | cupsFilePrintf(fp, | |
284 | "(allow process-exec\n" | |
285 | " (regex" | |
286 | " #\"^%s/\"" /* CUPS_TESTROOT/... */ | |
287 | "))\n", | |
288 | testroot); | |
59aa4944 | 289 | cupsFilePrintf(fp, "(allow sysctl*)\n"); |
8fe0183a MS |
290 | } |
291 | if (job_id) | |
292 | { | |
293 | /* Allow job filters to read the current job files... */ | |
a4924f6c MS |
294 | cupsFilePrintf(fp, |
295 | "(allow file-read-data file-read-metadata\n" | |
5a757074 | 296 | " (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n", |
5bd77a73 | 297 | request, job_id, job_id); |
e60ec91f MS |
298 | } |
299 | else | |
300 | { | |
8fe0183a | 301 | /* Allow email notifications from notifiers... */ |
e60ec91f MS |
302 | cupsFilePuts(fp, |
303 | "(allow process-exec\n" | |
304 | " (literal \"/usr/sbin/sendmail\")\n" | |
8fe0183a MS |
305 | " (with no-sandbox))\n"); |
306 | } | |
a94fe6cf MS |
307 | /* Allow access to Bluetooth, USB, and notify_post. */ |
308 | cupsFilePuts(fp, "(allow iokit*)\n"); | |
309 | cupsFilePuts(fp, "(allow distributed-notification-post)\n"); | |
777e09f8 | 310 | /* Allow outbound networking to local services */ |
8fe0183a | 311 | cupsFilePuts(fp, "(allow network-outbound" |
59aa4944 | 312 | "\n (regex #\"^/private/var/run/\" #\"^/private/tmp/\" #\"^/private/var/tmp/\")"); |
8fe0183a MS |
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"); | |
4c6277cc | 327 | cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */ |
8fe0183a MS |
328 | cupsFilePuts(fp, "(allow network*\n" |
329 | " (local udp \"*:*\")\n" | |
330 | " (remote udp \"*:*\"))\n"); | |
bcc4b655 | 331 | |
fb3777cc | 332 | /* Also allow access to device files... */ |
e2685126 | 333 | cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n" |
4c6277cc | 334 | " (regex #\"^/dev/\"))\n"); |
6e6611ef MS |
335 | |
336 | /* And allow kernel extensions to be loaded, e.g., SMB */ | |
337 | cupsFilePuts(fp, "(allow system-kext-load)\n"); | |
8fe0183a MS |
338 | } |
339 | else | |
340 | { | |
fb3777cc | 341 | /* Only allow SNMP (UDP) and LPD (TCP) off the machine... */ |
8fe0183a MS |
342 | cupsFilePuts(fp, ")\n"); |
343 | cupsFilePuts(fp, "(allow network-outbound\n" | |
2dd94018 | 344 | " (remote udp \"*:161\")\n" |
fb3777cc | 345 | " (remote tcp \"*:515\"))\n"); |
8fe0183a MS |
346 | cupsFilePuts(fp, "(allow network-inbound\n" |
347 | " (local udp \"localhost:*\"))\n"); | |
e60ec91f | 348 | } |
a4924f6c MS |
349 | cupsFileClose(fp); |
350 | ||
8fe0183a | 351 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile); |
a4924f6c | 352 | return ((void *)strdup(profile)); |
b9faaae1 | 353 | |
a4924f6c | 354 | #else |
8fe0183a | 355 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
a4924f6c MS |
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 | { | |
b9faaae1 MS |
369 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")", |
370 | profile ? (char *)profile : "(null)"); | |
371 | ||
a4924f6c MS |
372 | #ifdef HAVE_SANDBOX_H |
373 | if (profile) | |
374 | { | |
375 | unlink((char *)profile); | |
376 | free(profile); | |
377 | } | |
378 | #endif /* HAVE_SANDBOX_H */ | |
379 | } | |
e00b005a | 380 | |
381 | ||
ef416fc2 | 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 | { | |
b9faaae1 MS |
390 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid, |
391 | force); | |
392 | ||
ef55b745 MS |
393 | if (!pid) |
394 | return (0); | |
88f9aafc MS |
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) | |
ef416fc2 | 407 | return (kill(pid, SIGKILL)); |
408 | else | |
409 | return (kill(pid, SIGTERM)); | |
410 | } | |
411 | ||
412 | ||
e00b005a | 413 | /* |
414 | * 'cupsdFinishProcess()' - Finish a process and get its name. | |
415 | */ | |
416 | ||
417 | const char * /* O - Process name */ | |
07623986 MS |
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 */ | |
e00b005a | 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 | { | |
b9faaae1 MS |
431 | if (job_id) |
432 | *job_id = proc->job_id; | |
433 | ||
e00b005a | 434 | strlcpy(name, proc->name, namelen); |
435 | cupsArrayRemove(process_array, proc); | |
436 | free(proc); | |
e00b005a | 437 | } |
438 | else | |
b9faaae1 MS |
439 | { |
440 | if (job_id) | |
441 | *job_id = 0; | |
442 | ||
443 | strlcpy(name, "unknown", namelen); | |
444 | } | |
445 | ||
07623986 | 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); |
b9faaae1 MS |
447 | |
448 | return (name); | |
e00b005a | 449 | } |
450 | ||
451 | ||
ef416fc2 | 452 | /* |
453 | * 'cupsdStartProcess()' - Start a process. | |
454 | */ | |
455 | ||
456 | int /* O - Process ID or 0 */ | |
457 | cupsdStartProcess( | |
b9faaae1 MS |
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 */ | |
38e73f87 | 468 | cupsd_job_t *job, /* I - Job associated with process */ |
b9faaae1 | 469 | int *pid) /* O - Process ID */ |
ef416fc2 | 470 | { |
0268488e | 471 | int i; /* Looping var */ |
e60ec91f | 472 | const char *exec_path = command; /* Command to be exec'd */ |
28c194b0 | 473 | char *real_argv[110], /* Real command-line arguments */ |
1b3b9aa9 MS |
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 */ | |
7e86f2f6 | 478 | uid_t user; /* Command UID */ |
e00b005a | 479 | cupsd_proc_t *proc; /* New process record */ |
a7616fe8 | 480 | #if USE_POSIX_SPAWN |
c82f05ea MS |
481 | posix_spawn_file_actions_t actions; /* Spawn file actions */ |
482 | posix_spawnattr_t attrs; /* Spawn attributes */ | |
73174bb3 | 483 | sigset_t defsignals; /* Default signals */ |
07623986 | 484 | #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) |
e00b005a | 485 | struct sigaction action; /* POSIX signal handler */ |
a7616fe8 | 486 | #endif /* USE_POSIX_SPAWN */ |
e53920b9 | 487 | #if defined(__APPLE__) |
e00b005a | 488 | char processPath[1024], /* CFProcessPath environment variable */ |
489 | linkpath[1024]; /* Link path for symlinks... */ | |
490 | int linkbytes; /* Bytes for link path */ | |
e53920b9 | 491 | #endif /* __APPLE__ */ |
ef416fc2 | 492 | |
493 | ||
22c9029b MS |
494 | *pid = 0; |
495 | ||
0268488e MS |
496 | /* |
497 | * Figure out the UID for the child process... | |
498 | */ | |
499 | ||
bf3816c7 MS |
500 | if (RunUser) |
501 | user = RunUser; | |
502 | else if (root) | |
503 | user = 0; | |
504 | else | |
505 | user = User; | |
506 | ||
0268488e MS |
507 | /* |
508 | * Check the permissions of the command we are running... | |
509 | */ | |
510 | ||
22c9029b MS |
511 | if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser, |
512 | cupsdLogFCMessage, job ? job->printer : NULL)) | |
bf3816c7 | 513 | return (0); |
76cd9e37 | 514 | |
e53920b9 | 515 | #if defined(__APPLE__) |
516 | if (envp) | |
e00b005a | 517 | { |
518 | /* | |
f3c17241 MS |
519 | * Add special voodoo magic for OS X - this allows OS X programs to access |
520 | * their bundle resources properly... | |
e00b005a | 521 | */ |
522 | ||
e53920b9 | 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'; | |
e00b005a | 531 | |
e53920b9 | 532 | if (linkpath[0] == '/') |
533 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", | |
534 | linkpath); | |
535 | else | |
536 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s", | |
f7deaa1a | 537 | dirname((char *)command), linkpath); |
e53920b9 | 538 | } |
e00b005a | 539 | else |
e53920b9 | 540 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command); |
bd7854cb | 541 | |
e53920b9 | 542 | envp[0] = processPath; /* Replace <CFProcessPath> string */ |
543 | } | |
544 | #endif /* __APPLE__ */ | |
e00b005a | 545 | |
0268488e MS |
546 | /* |
547 | * Use helper program when we have a sandbox profile... | |
548 | */ | |
549 | ||
a7616fe8 | 550 | #if !USE_POSIX_SPAWN |
0268488e | 551 | if (profile) |
a7616fe8 | 552 | #endif /* !USE_POSIX_SPAWN */ |
0268488e MS |
553 | { |
554 | snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin); | |
8fe0183a | 555 | snprintf(user_str, sizeof(user_str), "%d", user); |
c82f05ea MS |
556 | snprintf(group_str, sizeof(group_str), "%d", Group); |
557 | snprintf(nice_str, sizeof(nice_str), "%d", FilterNice); | |
0268488e MS |
558 | |
559 | real_argv[0] = cups_exec; | |
28c194b0 MS |
560 | real_argv[1] = (char *)"-g"; |
561 | real_argv[2] = group_str; | |
562 | real_argv[3] = (char *)"-n"; | |
c82f05ea | 563 | real_argv[4] = nice_str; |
28c194b0 MS |
564 | real_argv[5] = (char *)"-u"; |
565 | real_argv[6] = user_str; | |
343276df | 566 | real_argv[7] = profile ? profile : "none"; |
28c194b0 | 567 | real_argv[8] = (char *)command; |
0268488e MS |
568 | |
569 | for (i = 0; | |
28c194b0 | 570 | i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i]; |
0268488e | 571 | i ++) |
28c194b0 | 572 | real_argv[i + 9] = argv[i]; |
0268488e | 573 | |
28c194b0 | 574 | real_argv[i + 9] = NULL; |
0268488e | 575 | |
e60ec91f MS |
576 | argv = real_argv; |
577 | exec_path = cups_exec; | |
0268488e MS |
578 | } |
579 | ||
c82f05ea MS |
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 | ||
a7616fe8 | 588 | #if USE_POSIX_SPAWN |
c82f05ea MS |
589 | /* |
590 | * Setup attributes and file actions for the spawn... | |
591 | */ | |
592 | ||
593 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes."); | |
73174bb3 MS |
594 | sigemptyset(&defsignals); |
595 | sigaddset(&defsignals, SIGTERM); | |
596 | sigaddset(&defsignals, SIGCHLD); | |
597 | sigaddset(&defsignals, SIGPIPE); | |
598 | ||
c82f05ea MS |
599 | posix_spawnattr_init(&attrs); |
600 | posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF); | |
73174bb3 MS |
601 | posix_spawnattr_setpgroup(&attrs, 0); |
602 | posix_spawnattr_setsigdefault(&attrs, &defsignals); | |
c82f05ea MS |
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) | |
0907c437 | 609 | posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_RDONLY, 0); |
c82f05ea MS |
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 | |
ef416fc2 | 651 | /* |
652 | * Block signals before forking... | |
653 | */ | |
654 | ||
655 | cupsdHoldSignals(); | |
656 | ||
657 | if ((*pid = fork()) == 0) | |
658 | { | |
659 | /* | |
88f9aafc MS |
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 | ||
c82f05ea | 680 | # ifdef HAVE_SETPGID |
88f9aafc MS |
681 | if (!RunUser && setpgid(0, 0)) |
682 | exit(errno + 100); | |
c82f05ea | 683 | # else |
88f9aafc MS |
684 | if (!RunUser && setpgrp()) |
685 | exit(errno + 100); | |
c82f05ea | 686 | # endif /* HAVE_SETPGID */ |
88f9aafc MS |
687 | |
688 | /* | |
689 | * Update the remaining file descriptors as needed... | |
ef416fc2 | 690 | */ |
691 | ||
692 | if (infd != 0) | |
693 | { | |
68b10830 MS |
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 | } | |
ef416fc2 | 702 | } |
68b10830 | 703 | |
ef416fc2 | 704 | if (outfd != 1) |
705 | { | |
68b10830 MS |
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 | } | |
ef416fc2 | 714 | } |
68b10830 | 715 | |
68b10830 | 716 | if (backfd != 3 && backfd >= 0) |
ef416fc2 | 717 | { |
68b10830 MS |
718 | dup2(backfd, 3); |
719 | close(backfd); | |
ef416fc2 | 720 | fcntl(3, F_SETFL, O_NDELAY); |
721 | } | |
68b10830 MS |
722 | |
723 | if (sidefd != 4 && sidefd >= 0) | |
f7deaa1a | 724 | { |
68b10830 MS |
725 | dup2(sidefd, 4); |
726 | close(sidefd); | |
f7deaa1a | 727 | fcntl(4, F_SETFL, O_NDELAY); |
728 | } | |
ef416fc2 | 729 | |
730 | /* | |
731 | * Change the priority of the process based on the FilterNice setting. | |
5bd77a73 | 732 | * (this is not done for root processes...) |
ef416fc2 | 733 | */ |
734 | ||
735 | if (!root) | |
736 | nice(FilterNice); | |
737 | ||
738 | /* | |
88f9aafc | 739 | * Reset group membership to just the main one we belong to. |
ef416fc2 | 740 | */ |
741 | ||
88f9aafc MS |
742 | if (!RunUser && setgid(Group)) |
743 | exit(errno + 100); | |
ef416fc2 | 744 | |
88f9aafc MS |
745 | if (!RunUser && setgroups(1, &Group)) |
746 | exit(errno + 100); | |
ef416fc2 | 747 | |
88f9aafc MS |
748 | /* |
749 | * Change user to something "safe"... | |
750 | */ | |
41681883 | 751 | |
88f9aafc MS |
752 | if (!RunUser && user && setuid(user)) |
753 | exit(errno + 100); | |
ef416fc2 | 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 | ||
c82f05ea | 765 | # ifdef HAVE_SIGSET |
ef416fc2 | 766 | sigset(SIGTERM, SIG_DFL); |
767 | sigset(SIGCHLD, SIG_DFL); | |
ef55b745 | 768 | sigset(SIGPIPE, SIG_DFL); |
c82f05ea | 769 | # elif defined(HAVE_SIGACTION) |
ef416fc2 | 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); | |
ef55b745 | 777 | sigaction(SIGPIPE, &action, NULL); |
c82f05ea | 778 | # else |
ef416fc2 | 779 | signal(SIGTERM, SIG_DFL); |
780 | signal(SIGCHLD, SIG_DFL); | |
ef55b745 | 781 | signal(SIGPIPE, SIG_DFL); |
c82f05ea | 782 | # endif /* HAVE_SIGSET */ |
ef416fc2 | 783 | |
784 | cupsdReleaseSignals(); | |
785 | ||
786 | /* | |
0268488e MS |
787 | * Execute the command; if for some reason this doesn't work, log an error |
788 | * exit with a non-zero value... | |
ef416fc2 | 789 | */ |
790 | ||
791 | if (envp) | |
e60ec91f | 792 | execve(exec_path, argv, envp); |
ef416fc2 | 793 | else |
e60ec91f | 794 | execv(exec_path, argv); |
ef416fc2 | 795 | |
88f9aafc | 796 | exit(errno + 100); |
ef416fc2 | 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 | } | |
c82f05ea MS |
809 | |
810 | cupsdReleaseSignals(); | |
a7616fe8 | 811 | #endif /* USE_POSIX_SPAWN */ |
c82f05ea MS |
812 | |
813 | if (*pid) | |
e00b005a | 814 | { |
815 | if (!process_array) | |
816 | process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL); | |
f3c17241 | 817 | |
e00b005a | 818 | if (process_array) |
819 | { | |
820 | if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL) | |
821 | { | |
b9faaae1 | 822 | proc->pid = *pid; |
38e73f87 | 823 | proc->job_id = job ? job->id : 0; |
e60ec91f | 824 | _cups_strcpy(proc->name, command); |
e00b005a | 825 | |
826 | cupsArrayAdd(process_array, proc); | |
827 | } | |
828 | } | |
829 | } | |
ef416fc2 | 830 | |
b9faaae1 MS |
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, " | |
38e73f87 | 834 | "profile=%p, job=%p(%d), pid=%p) = %d", |
b9faaae1 | 835 | command, argv, envp, infd, outfd, errfd, backfd, sidefd, |
38e73f87 | 836 | root, profile, job, job ? job->id : 0, pid, *pid); |
b9faaae1 | 837 | |
ef416fc2 | 838 | return (*pid); |
839 | } | |
840 | ||
841 | ||
842 | /* | |
e00b005a | 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 | ||
a4924f6c MS |
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 | ||
cb7f98ee MS |
876 | if (ch == '/' && !*src) |
877 | break; /* Don't add trailing slash */ | |
878 | ||
a4924f6c MS |
879 | if (strchr(".?*()[]^$\\", ch)) |
880 | *dstptr++ = '\\'; | |
881 | ||
7e86f2f6 | 882 | *dstptr++ = (char)ch; |
a4924f6c MS |
883 | } |
884 | ||
885 | *dstptr = '\0'; | |
886 | ||
887 | return (dst); | |
888 | } | |
889 | #endif /* HAVE_SANDBOX_H */ | |
890 | ||
891 | ||
e00b005a | 892 | /* |
f2d18633 | 893 | * End of "$Id$". |
ef416fc2 | 894 | */ |