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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 | * |
7e86f2f6 MS |
6 | * Copyright 2007-2014 by Apple Inc. |
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 */ | |
ef416fc2 | 29 | |
30 | ||
e00b005a | 31 | /* |
32 | * Process structure... | |
33 | */ | |
34 | ||
35 | typedef struct | |
36 | { | |
b9faaae1 MS |
37 | int pid, /* Process ID */ |
38 | job_id; /* Job associated with process */ | |
e00b005a | 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); | |
a4924f6c MS |
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 */ | |
8fe0183a MS |
65 | cupsdCreateProfile(int job_id, /* I - Job ID or 0 for none */ |
66 | int allow_networking)/* I - Allow networking off machine? */ | |
a4924f6c MS |
67 | { |
68 | #ifdef HAVE_SANDBOX_H | |
8fe0183a MS |
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) | |
b9faaae1 MS |
82 | { |
83 | /* | |
84 | * Only use sandbox profiles as root... | |
85 | */ | |
86 | ||
8fe0183a | 87 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
b9faaae1 MS |
88 | |
89 | return (NULL); | |
90 | } | |
91 | ||
a4924f6c MS |
92 | if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL) |
93 | { | |
8fe0183a | 94 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
a4924f6c MS |
95 | cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s", |
96 | strerror(errno)); | |
97 | return (NULL); | |
98 | } | |
99 | ||
0268488e MS |
100 | fchown(cupsFileNumber(fp), RunUser, Group); |
101 | fchmod(cupsFileNumber(fp), 0640); | |
102 | ||
8fe0183a | 103 | cupsd_requote(bin, ServerBin, sizeof(bin)); |
a4924f6c MS |
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 | ||
88f9aafc MS |
109 | nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : ""; |
110 | ||
a4924f6c | 111 | cupsFilePuts(fp, "(version 1)\n"); |
8fe0183a MS |
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"); | |
a4924f6c | 125 | cupsFilePrintf(fp, |
8fe0183a MS |
126 | "(deny file-write* file-read-data file-read-metadata\n" |
127 | " (regex" | |
5a6b583a MS |
128 | " #\"^%s$\"" /* RequestRoot */ |
129 | " #\"^%s/\"" /* RequestRoot/... */ | |
88f9aafc MS |
130 | ")%s)\n", |
131 | request, request, nodebug); | |
0268488e | 132 | if (!RunUser) |
88f9aafc MS |
133 | cupsFilePrintf(fp, |
134 | "(deny file-write* file-read-data file-read-metadata\n" | |
135 | " (regex" | |
136 | " #\"^/Users$\"" | |
137 | " #\"^/Users/\"" | |
138 | ")%s)\n", nodebug); | |
a4924f6c MS |
139 | cupsFilePrintf(fp, |
140 | "(deny file-write*\n" | |
5a6b583a MS |
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$\"" | |
151 | " #\"^/System/\"" | |
88f9aafc MS |
152 | ")%s)\n", |
153 | root, root, nodebug); | |
8fe0183a | 154 | /* Specifically allow applications to stat RequestRoot and some other system folders */ |
7cf5915e MS |
155 | cupsFilePrintf(fp, |
156 | "(allow file-read-metadata\n" | |
157 | " (regex" | |
8fe0183a MS |
158 | " #\"^/$\"" /* / */ |
159 | " #\"^/usr$\"" /* /usr */ | |
160 | " #\"^/Library$\"" /* /Library */ | |
161 | " #\"^/Library/Printers$\"" /* /Library/Printers */ | |
7cf5915e MS |
162 | " #\"^%s$\"" /* RequestRoot */ |
163 | "))\n", | |
164 | request); | |
8fe0183a | 165 | /* Read and write TempDir, CacheDir, and other common folders */ |
a4924f6c MS |
166 | cupsFilePrintf(fp, |
167 | "(allow file-write* file-read-data file-read-metadata\n" | |
5a6b583a MS |
168 | " (regex" |
169 | " #\"^%s$\"" /* TempDir */ | |
170 | " #\"^%s/\"" /* TempDir/... */ | |
171 | " #\"^%s$\"" /* CacheDir */ | |
172 | " #\"^%s/\"" /* CacheDir/... */ | |
bcc4b655 | 173 | " #\"^/private/var/db/\"" |
8fe0183a | 174 | " #\"^/private/var/folders/\"" |
777e09f8 | 175 | " #\"^/private/var/run/\"" |
ed6e7faf MS |
176 | " #\"^/Library/Application Support/\"" |
177 | " #\"^/Library/Caches/\"" | |
178 | " #\"^/Library/Preferences/\"" | |
5a6b583a | 179 | " #\"^/Users/Shared/\"" |
ed6e7faf | 180 | "))\n", |
8fe0183a MS |
181 | temp, temp, cache, cache); |
182 | /* Read common folders */ | |
88f9aafc | 183 | cupsFilePrintf(fp, |
8fe0183a | 184 | "(allow file-read-data file-read-metadata\n" |
8fe0183a | 185 | " (regex" |
bcc4b655 MS |
186 | " #\"^/AppleInternal$\"" |
187 | " #\"^/AppleInternal/\"" | |
8fe0183a MS |
188 | " #\"^/bin$\"" /* /bin */ |
189 | " #\"^/bin/\"" /* /bin/... */ | |
777e09f8 | 190 | " #\"^/private$\"" |
d9183105 MS |
191 | " #\"^/private/etc$\"" |
192 | " #\"^/private/etc/\"" | |
777e09f8 MS |
193 | " #\"^/private/var$\"" |
194 | " #\"^/private/var/db$\"" | |
d9183105 | 195 | " #\"^/private/var/folders$\"" |
777e09f8 | 196 | " #\"^/private/var/spool$\"" |
8fe0183a MS |
197 | " #\"^/usr/bin$\"" /* /usr/bin */ |
198 | " #\"^/usr/bin/\"" /* /usr/bin/... */ | |
199 | " #\"^/usr/libexec/cups$\"" /* /usr/libexec/cups */ | |
200 | " #\"^/usr/libexec/cups/\"" /* /usr/libexec/cups/... */ | |
3f4342fa MS |
201 | " #\"^/usr/libexec/fax$\"" /* /usr/libexec/fax */ |
202 | " #\"^/usr/libexec/fax/\"" /* /usr/libexec/fax/... */ | |
8fe0183a MS |
203 | " #\"^/usr/sbin$\"" /* /usr/sbin */ |
204 | " #\"^/usr/sbin/\"" /* /usr/sbin/... */ | |
0e53e7d1 MS |
205 | " #\"^/Library/Application Support$\"" |
206 | " #\"^/Library/Application Support/\"" | |
8fe0183a MS |
207 | " #\"^/Library/Caches$\"" |
208 | " #\"^/Library/Fonts$\"" | |
209 | " #\"^/Library/Fonts/\"" | |
96964950 MS |
210 | " #\"^/Library/Frameworks$\"" |
211 | " #\"^/Library/Frameworks/\"" | |
777e09f8 MS |
212 | " #\"^/Library/Keychains$\"" |
213 | " #\"^/Library/Keychains/\"" | |
8fe0183a | 214 | " #\"^/Library/Printers$\"" |
777e09f8 | 215 | " #\"^/Library/Printers/\"" |
8fe0183a MS |
216 | " #\"^%s/Library$\"" /* RequestRoot/Library */ |
217 | " #\"^%s/Library/\"" /* RequestRoot/Library/... */ | |
218 | " #\"^%s$\"" /* ServerBin */ | |
219 | " #\"^%s/\"" /* ServerBin/... */ | |
220 | " #\"^%s$\"" /* ServerRoot */ | |
221 | " #\"^%s/\"" /* ServerRoot/... */ | |
222 | "))\n", | |
223 | request, request, bin, bin, root, root); | |
224 | if (Sandboxing == CUPSD_SANDBOXING_RELAXED) | |
225 | { | |
226 | /* Limited write access to /Library/Printers/... */ | |
227 | cupsFilePuts(fp, | |
228 | "(allow file-write*\n" | |
88f9aafc | 229 | " (regex" |
8fe0183a MS |
230 | " #\"^/Library/Printers/.*/\"" |
231 | "))\n"); | |
232 | cupsFilePrintf(fp, | |
233 | "(deny file-write*\n" | |
234 | " (regex" | |
235 | " #\"^/Library/Printers/PPDs$\"" | |
236 | " #\"^/Library/Printers/PPDs/\"" | |
237 | " #\"^/Library/Printers/PPD Plugins$\"" | |
238 | " #\"^/Library/Printers/PPD Plugins/\"" | |
239 | ")%s)\n", nodebug); | |
240 | } | |
241 | /* Allow execution of child processes */ | |
242 | cupsFilePuts(fp, "(allow process-fork)\n"); | |
243 | cupsFilePrintf(fp, | |
244 | "(allow process-exec\n" | |
245 | " (regex" | |
246 | " #\"^/bin/\"" /* /bin/... */ | |
247 | " #\"^/usr/bin/\"" /* /usr/bin/... */ | |
248 | " #\"^/usr/libexec/cups/\"" /* /usr/libexec/cups/... */ | |
8a6466eb | 249 | " #\"^/usr/libexec/fax/\"" /* /usr/libexec/fax/... */ |
8fe0183a MS |
250 | " #\"^/usr/sbin/\"" /* /usr/sbin/... */ |
251 | " #\"^%s/\"" /* ServerBin/... */ | |
252 | " #\"^/Library/Printers/.*/\"" | |
3f4342fa | 253 | " #\"^/System/Library/Frameworks/Python.framework/\"" |
8fe0183a MS |
254 | "))\n", |
255 | bin); | |
256 | if (RunUser && getenv("CUPS_TESTROOT")) | |
e60ec91f | 257 | { |
8fe0183a MS |
258 | /* Allow source directory access in "make test" environment */ |
259 | char testroot[1024]; /* Root directory of test files */ | |
e60ec91f | 260 | |
8fe0183a MS |
261 | cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot)); |
262 | ||
263 | cupsFilePrintf(fp, | |
264 | "(allow file-write* file-read-data file-read-metadata\n" | |
265 | " (regex" | |
266 | " #\"^%s$\"" /* CUPS_TESTROOT */ | |
267 | " #\"^%s/\"" /* CUPS_TESTROOT/... */ | |
268 | "))\n", | |
269 | testroot, testroot); | |
270 | cupsFilePrintf(fp, | |
271 | "(allow process-exec\n" | |
272 | " (regex" | |
273 | " #\"^%s/\"" /* CUPS_TESTROOT/... */ | |
274 | "))\n", | |
275 | testroot); | |
276 | } | |
277 | if (job_id) | |
278 | { | |
279 | /* Allow job filters to read the current job files... */ | |
a4924f6c MS |
280 | cupsFilePrintf(fp, |
281 | "(allow file-read-data file-read-metadata\n" | |
5a757074 | 282 | " (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n", |
5bd77a73 | 283 | request, job_id, job_id); |
e60ec91f MS |
284 | } |
285 | else | |
286 | { | |
8fe0183a | 287 | /* Allow email notifications from notifiers... */ |
e60ec91f MS |
288 | cupsFilePuts(fp, |
289 | "(allow process-exec\n" | |
290 | " (literal \"/usr/sbin/sendmail\")\n" | |
8fe0183a MS |
291 | " (with no-sandbox))\n"); |
292 | } | |
777e09f8 | 293 | /* Allow outbound networking to local services */ |
8fe0183a | 294 | cupsFilePuts(fp, "(allow network-outbound" |
777e09f8 | 295 | "\n (regex #\"^/private/var/run/\")"); |
8fe0183a MS |
296 | for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners); |
297 | lis; | |
298 | lis = (cupsd_listener_t *)cupsArrayNext(Listeners)) | |
299 | { | |
300 | if (httpAddrFamily(&(lis->address)) == AF_LOCAL) | |
301 | { | |
302 | httpAddrString(&(lis->address), domain, sizeof(domain)); | |
303 | cupsFilePrintf(fp, "\n (literal \"%s\")", domain); | |
304 | } | |
305 | } | |
306 | if (allow_networking) | |
307 | { | |
308 | /* Allow TCP and UDP networking off the machine... */ | |
309 | cupsFilePuts(fp, "\n (remote tcp))\n"); | |
4c6277cc | 310 | cupsFilePuts(fp, "(allow network-bind)\n"); /* for LPD resvport */ |
8fe0183a MS |
311 | cupsFilePuts(fp, "(allow network*\n" |
312 | " (local udp \"*:*\")\n" | |
313 | " (remote udp \"*:*\"))\n"); | |
bcc4b655 | 314 | |
6e83de05 | 315 | /* Also allow access to Bluetooth, USB, device files, etc. */ |
c12b983a | 316 | cupsFilePuts(fp, "(allow iokit*)\n"); |
e2685126 | 317 | cupsFilePuts(fp, "(allow file-write* file-read-data file-read-metadata file-ioctl\n" |
4c6277cc | 318 | " (regex #\"^/dev/\"))\n"); |
6e83de05 | 319 | cupsFilePuts(fp, "(allow distributed-notification-post)\n"); |
8fe0183a MS |
320 | } |
321 | else | |
322 | { | |
323 | /* Only allow SNMP (UDP) off the machine... */ | |
324 | cupsFilePuts(fp, ")\n"); | |
325 | cupsFilePuts(fp, "(allow network-outbound\n" | |
326 | " (remote udp \"*:161\"))\n"); | |
327 | cupsFilePuts(fp, "(allow network-inbound\n" | |
328 | " (local udp \"localhost:*\"))\n"); | |
c12b983a | 329 | cupsFilePuts(fp, "(deny iokit* (with no-report))\n"); |
e60ec91f | 330 | } |
a4924f6c MS |
331 | cupsFileClose(fp); |
332 | ||
8fe0183a | 333 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile); |
a4924f6c | 334 | return ((void *)strdup(profile)); |
b9faaae1 | 335 | |
a4924f6c | 336 | #else |
8fe0183a | 337 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking); |
a4924f6c MS |
338 | |
339 | return (NULL); | |
340 | #endif /* HAVE_SANDBOX_H */ | |
341 | } | |
342 | ||
343 | ||
344 | /* | |
345 | * 'cupsdDestroyProfile()' - Delete an execution profile. | |
346 | */ | |
347 | ||
348 | void | |
349 | cupsdDestroyProfile(void *profile) /* I - Profile */ | |
350 | { | |
b9faaae1 MS |
351 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")", |
352 | profile ? (char *)profile : "(null)"); | |
353 | ||
a4924f6c MS |
354 | #ifdef HAVE_SANDBOX_H |
355 | if (profile) | |
356 | { | |
357 | unlink((char *)profile); | |
358 | free(profile); | |
359 | } | |
360 | #endif /* HAVE_SANDBOX_H */ | |
361 | } | |
e00b005a | 362 | |
363 | ||
ef416fc2 | 364 | /* |
365 | * 'cupsdEndProcess()' - End a process. | |
366 | */ | |
367 | ||
368 | int /* O - 0 on success, -1 on failure */ | |
369 | cupsdEndProcess(int pid, /* I - Process ID */ | |
370 | int force) /* I - Force child to die */ | |
371 | { | |
b9faaae1 MS |
372 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid, |
373 | force); | |
374 | ||
ef55b745 MS |
375 | if (!pid) |
376 | return (0); | |
88f9aafc MS |
377 | |
378 | if (!RunUser) | |
379 | { | |
380 | /* | |
381 | * When running as root, cupsd puts child processes in their own process | |
382 | * group. Using "-pid" sends a signal to all processes in the group. | |
383 | */ | |
384 | ||
385 | pid = -pid; | |
386 | } | |
387 | ||
388 | if (force) | |
ef416fc2 | 389 | return (kill(pid, SIGKILL)); |
390 | else | |
391 | return (kill(pid, SIGTERM)); | |
392 | } | |
393 | ||
394 | ||
e00b005a | 395 | /* |
396 | * 'cupsdFinishProcess()' - Finish a process and get its name. | |
397 | */ | |
398 | ||
399 | const char * /* O - Process name */ | |
07623986 MS |
400 | cupsdFinishProcess(int pid, /* I - Process ID */ |
401 | char *name, /* I - Name buffer */ | |
402 | size_t namelen, /* I - Size of name buffer */ | |
403 | int *job_id) /* O - Job ID pointer or NULL */ | |
e00b005a | 404 | { |
405 | cupsd_proc_t key, /* Search key */ | |
406 | *proc; /* Matching process */ | |
407 | ||
408 | ||
409 | key.pid = pid; | |
410 | ||
411 | if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL) | |
412 | { | |
b9faaae1 MS |
413 | if (job_id) |
414 | *job_id = proc->job_id; | |
415 | ||
e00b005a | 416 | strlcpy(name, proc->name, namelen); |
417 | cupsArrayRemove(process_array, proc); | |
418 | free(proc); | |
e00b005a | 419 | } |
420 | else | |
b9faaae1 MS |
421 | { |
422 | if (job_id) | |
423 | *job_id = 0; | |
424 | ||
425 | strlcpy(name, "unknown", namelen); | |
426 | } | |
427 | ||
07623986 | 428 | 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 |
429 | |
430 | return (name); | |
e00b005a | 431 | } |
432 | ||
433 | ||
ef416fc2 | 434 | /* |
435 | * 'cupsdStartProcess()' - Start a process. | |
436 | */ | |
437 | ||
438 | int /* O - Process ID or 0 */ | |
439 | cupsdStartProcess( | |
b9faaae1 MS |
440 | const char *command, /* I - Full path to command */ |
441 | char *argv[], /* I - Command-line arguments */ | |
442 | char *envp[], /* I - Environment */ | |
443 | int infd, /* I - Standard input file descriptor */ | |
444 | int outfd, /* I - Standard output file descriptor */ | |
445 | int errfd, /* I - Standard error file descriptor */ | |
446 | int backfd, /* I - Backchannel file descriptor */ | |
447 | int sidefd, /* I - Sidechannel file descriptor */ | |
448 | int root, /* I - Run as root? */ | |
449 | void *profile, /* I - Security profile to use */ | |
38e73f87 | 450 | cupsd_job_t *job, /* I - Job associated with process */ |
b9faaae1 | 451 | int *pid) /* O - Process ID */ |
ef416fc2 | 452 | { |
0268488e | 453 | int i; /* Looping var */ |
e60ec91f | 454 | const char *exec_path = command; /* Command to be exec'd */ |
28c194b0 | 455 | char *real_argv[110], /* Real command-line arguments */ |
0268488e | 456 | cups_exec[1024]; /* Path to "cups-exec" program */ |
7e86f2f6 | 457 | uid_t user; /* Command UID */ |
e00b005a | 458 | cupsd_proc_t *proc; /* New process record */ |
c82f05ea MS |
459 | #ifdef HAVE_POSIX_SPAWN |
460 | posix_spawn_file_actions_t actions; /* Spawn file actions */ | |
461 | posix_spawnattr_t attrs; /* Spawn attributes */ | |
462 | char user_str[16], /* User string */ | |
463 | group_str[16], /* Group string */ | |
464 | nice_str[16]; /* FilterNice string */ | |
07623986 | 465 | #elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) |
e00b005a | 466 | struct sigaction action; /* POSIX signal handler */ |
07623986 | 467 | #endif /* HAVE_POSIX_SPAWN */ |
e53920b9 | 468 | #if defined(__APPLE__) |
e00b005a | 469 | char processPath[1024], /* CFProcessPath environment variable */ |
470 | linkpath[1024]; /* Link path for symlinks... */ | |
471 | int linkbytes; /* Bytes for link path */ | |
e53920b9 | 472 | #endif /* __APPLE__ */ |
ef416fc2 | 473 | |
474 | ||
22c9029b MS |
475 | *pid = 0; |
476 | ||
0268488e MS |
477 | /* |
478 | * Figure out the UID for the child process... | |
479 | */ | |
480 | ||
bf3816c7 MS |
481 | if (RunUser) |
482 | user = RunUser; | |
483 | else if (root) | |
484 | user = 0; | |
485 | else | |
486 | user = User; | |
487 | ||
0268488e MS |
488 | /* |
489 | * Check the permissions of the command we are running... | |
490 | */ | |
491 | ||
22c9029b MS |
492 | if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser, |
493 | cupsdLogFCMessage, job ? job->printer : NULL)) | |
bf3816c7 | 494 | return (0); |
76cd9e37 | 495 | |
e53920b9 | 496 | #if defined(__APPLE__) |
497 | if (envp) | |
e00b005a | 498 | { |
499 | /* | |
f3c17241 MS |
500 | * Add special voodoo magic for OS X - this allows OS X programs to access |
501 | * their bundle resources properly... | |
e00b005a | 502 | */ |
503 | ||
e53920b9 | 504 | if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0) |
505 | { | |
506 | /* | |
507 | * Yes, this is a symlink to the actual program, nul-terminate and | |
508 | * use it... | |
509 | */ | |
510 | ||
511 | linkpath[linkbytes] = '\0'; | |
e00b005a | 512 | |
e53920b9 | 513 | if (linkpath[0] == '/') |
514 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", | |
515 | linkpath); | |
516 | else | |
517 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s", | |
f7deaa1a | 518 | dirname((char *)command), linkpath); |
e53920b9 | 519 | } |
e00b005a | 520 | else |
e53920b9 | 521 | snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command); |
bd7854cb | 522 | |
e53920b9 | 523 | envp[0] = processPath; /* Replace <CFProcessPath> string */ |
524 | } | |
525 | #endif /* __APPLE__ */ | |
e00b005a | 526 | |
0268488e MS |
527 | /* |
528 | * Use helper program when we have a sandbox profile... | |
529 | */ | |
530 | ||
c82f05ea | 531 | #ifndef HAVE_POSIX_SPAWN |
0268488e | 532 | if (profile) |
c82f05ea | 533 | #endif /* !HAVE_POSIX_SPAWN */ |
0268488e MS |
534 | { |
535 | snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin); | |
8fe0183a | 536 | snprintf(user_str, sizeof(user_str), "%d", user); |
c82f05ea MS |
537 | snprintf(group_str, sizeof(group_str), "%d", Group); |
538 | snprintf(nice_str, sizeof(nice_str), "%d", FilterNice); | |
0268488e MS |
539 | |
540 | real_argv[0] = cups_exec; | |
28c194b0 MS |
541 | real_argv[1] = (char *)"-g"; |
542 | real_argv[2] = group_str; | |
543 | real_argv[3] = (char *)"-n"; | |
c82f05ea | 544 | real_argv[4] = nice_str; |
28c194b0 MS |
545 | real_argv[5] = (char *)"-u"; |
546 | real_argv[6] = user_str; | |
547 | real_argv[7] = profile; | |
548 | real_argv[8] = (char *)command; | |
0268488e MS |
549 | |
550 | for (i = 0; | |
28c194b0 | 551 | i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i]; |
0268488e | 552 | i ++) |
28c194b0 | 553 | real_argv[i + 9] = argv[i]; |
0268488e | 554 | |
28c194b0 | 555 | real_argv[i + 9] = NULL; |
0268488e | 556 | |
e60ec91f MS |
557 | argv = real_argv; |
558 | exec_path = cups_exec; | |
0268488e MS |
559 | } |
560 | ||
c82f05ea MS |
561 | if (LogLevel == CUPSD_LOG_DEBUG2) |
562 | { | |
563 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command); | |
564 | ||
565 | for (i = 0; argv[i]; i ++) | |
566 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]); | |
567 | } | |
568 | ||
569 | #ifdef HAVE_POSIX_SPAWN | |
570 | /* | |
571 | * Setup attributes and file actions for the spawn... | |
572 | */ | |
573 | ||
574 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes."); | |
575 | posix_spawnattr_init(&attrs); | |
576 | posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF); | |
577 | ||
578 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions."); | |
579 | posix_spawn_file_actions_init(&actions); | |
580 | if (infd != 0) | |
581 | { | |
582 | if (infd < 0) | |
583 | posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0); | |
584 | else | |
585 | posix_spawn_file_actions_adddup2(&actions, infd, 0); | |
586 | } | |
587 | ||
588 | if (outfd != 1) | |
589 | { | |
590 | if (outfd < 0) | |
591 | posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0); | |
592 | else | |
593 | posix_spawn_file_actions_adddup2(&actions, outfd, 1); | |
594 | } | |
595 | ||
596 | if (errfd != 2) | |
597 | { | |
598 | if (errfd < 0) | |
599 | posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0); | |
600 | else | |
601 | posix_spawn_file_actions_adddup2(&actions, errfd, 2); | |
602 | } | |
603 | ||
604 | if (backfd != 3 && backfd >= 0) | |
605 | posix_spawn_file_actions_adddup2(&actions, backfd, 3); | |
606 | ||
607 | if (sidefd != 4 && sidefd >= 0) | |
608 | posix_spawn_file_actions_adddup2(&actions, sidefd, 4); | |
609 | ||
610 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn."); | |
611 | ||
612 | if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ)) | |
613 | { | |
614 | cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno)); | |
615 | ||
616 | *pid = 0; | |
617 | } | |
618 | else | |
619 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid); | |
620 | ||
621 | posix_spawn_file_actions_destroy(&actions); | |
622 | posix_spawnattr_destroy(&attrs); | |
623 | ||
624 | #else | |
ef416fc2 | 625 | /* |
626 | * Block signals before forking... | |
627 | */ | |
628 | ||
629 | cupsdHoldSignals(); | |
630 | ||
631 | if ((*pid = fork()) == 0) | |
632 | { | |
633 | /* | |
88f9aafc MS |
634 | * Child process goes here; update stderr as needed... |
635 | */ | |
636 | ||
637 | if (errfd != 2) | |
638 | { | |
639 | if (errfd < 0) | |
640 | errfd = open("/dev/null", O_WRONLY); | |
641 | ||
642 | if (errfd != 2) | |
643 | { | |
644 | dup2(errfd, 2); | |
645 | close(errfd); | |
646 | } | |
647 | } | |
648 | ||
649 | /* | |
650 | * Put this process in its own process group so that we can kill any child | |
651 | * processes it creates. | |
652 | */ | |
653 | ||
c82f05ea | 654 | # ifdef HAVE_SETPGID |
88f9aafc MS |
655 | if (!RunUser && setpgid(0, 0)) |
656 | exit(errno + 100); | |
c82f05ea | 657 | # else |
88f9aafc MS |
658 | if (!RunUser && setpgrp()) |
659 | exit(errno + 100); | |
c82f05ea | 660 | # endif /* HAVE_SETPGID */ |
88f9aafc MS |
661 | |
662 | /* | |
663 | * Update the remaining file descriptors as needed... | |
ef416fc2 | 664 | */ |
665 | ||
666 | if (infd != 0) | |
667 | { | |
68b10830 MS |
668 | if (infd < 0) |
669 | infd = open("/dev/null", O_RDONLY); | |
670 | ||
671 | if (infd != 0) | |
672 | { | |
673 | dup2(infd, 0); | |
674 | close(infd); | |
675 | } | |
ef416fc2 | 676 | } |
68b10830 | 677 | |
ef416fc2 | 678 | if (outfd != 1) |
679 | { | |
68b10830 MS |
680 | if (outfd < 0) |
681 | outfd = open("/dev/null", O_WRONLY); | |
682 | ||
683 | if (outfd != 1) | |
684 | { | |
685 | dup2(outfd, 1); | |
686 | close(outfd); | |
687 | } | |
ef416fc2 | 688 | } |
68b10830 | 689 | |
68b10830 | 690 | if (backfd != 3 && backfd >= 0) |
ef416fc2 | 691 | { |
68b10830 MS |
692 | dup2(backfd, 3); |
693 | close(backfd); | |
ef416fc2 | 694 | fcntl(3, F_SETFL, O_NDELAY); |
695 | } | |
68b10830 MS |
696 | |
697 | if (sidefd != 4 && sidefd >= 0) | |
f7deaa1a | 698 | { |
68b10830 MS |
699 | dup2(sidefd, 4); |
700 | close(sidefd); | |
f7deaa1a | 701 | fcntl(4, F_SETFL, O_NDELAY); |
702 | } | |
ef416fc2 | 703 | |
704 | /* | |
705 | * Change the priority of the process based on the FilterNice setting. | |
5bd77a73 | 706 | * (this is not done for root processes...) |
ef416fc2 | 707 | */ |
708 | ||
709 | if (!root) | |
710 | nice(FilterNice); | |
711 | ||
712 | /* | |
88f9aafc | 713 | * Reset group membership to just the main one we belong to. |
ef416fc2 | 714 | */ |
715 | ||
88f9aafc MS |
716 | if (!RunUser && setgid(Group)) |
717 | exit(errno + 100); | |
ef416fc2 | 718 | |
88f9aafc MS |
719 | if (!RunUser && setgroups(1, &Group)) |
720 | exit(errno + 100); | |
ef416fc2 | 721 | |
88f9aafc MS |
722 | /* |
723 | * Change user to something "safe"... | |
724 | */ | |
41681883 | 725 | |
88f9aafc MS |
726 | if (!RunUser && user && setuid(user)) |
727 | exit(errno + 100); | |
ef416fc2 | 728 | |
729 | /* | |
730 | * Change umask to restrict permissions on created files... | |
731 | */ | |
732 | ||
733 | umask(077); | |
734 | ||
735 | /* | |
736 | * Unblock signals before doing the exec... | |
737 | */ | |
738 | ||
c82f05ea | 739 | # ifdef HAVE_SIGSET |
ef416fc2 | 740 | sigset(SIGTERM, SIG_DFL); |
741 | sigset(SIGCHLD, SIG_DFL); | |
ef55b745 | 742 | sigset(SIGPIPE, SIG_DFL); |
c82f05ea | 743 | # elif defined(HAVE_SIGACTION) |
ef416fc2 | 744 | memset(&action, 0, sizeof(action)); |
745 | ||
746 | sigemptyset(&action.sa_mask); | |
747 | action.sa_handler = SIG_DFL; | |
748 | ||
749 | sigaction(SIGTERM, &action, NULL); | |
750 | sigaction(SIGCHLD, &action, NULL); | |
ef55b745 | 751 | sigaction(SIGPIPE, &action, NULL); |
c82f05ea | 752 | # else |
ef416fc2 | 753 | signal(SIGTERM, SIG_DFL); |
754 | signal(SIGCHLD, SIG_DFL); | |
ef55b745 | 755 | signal(SIGPIPE, SIG_DFL); |
c82f05ea | 756 | # endif /* HAVE_SIGSET */ |
ef416fc2 | 757 | |
758 | cupsdReleaseSignals(); | |
759 | ||
760 | /* | |
0268488e MS |
761 | * Execute the command; if for some reason this doesn't work, log an error |
762 | * exit with a non-zero value... | |
ef416fc2 | 763 | */ |
764 | ||
765 | if (envp) | |
e60ec91f | 766 | execve(exec_path, argv, envp); |
ef416fc2 | 767 | else |
e60ec91f | 768 | execv(exec_path, argv); |
ef416fc2 | 769 | |
88f9aafc | 770 | exit(errno + 100); |
ef416fc2 | 771 | } |
772 | else if (*pid < 0) | |
773 | { | |
774 | /* | |
775 | * Error - couldn't fork a new process! | |
776 | */ | |
777 | ||
778 | cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, | |
779 | strerror(errno)); | |
780 | ||
781 | *pid = 0; | |
782 | } | |
c82f05ea MS |
783 | |
784 | cupsdReleaseSignals(); | |
785 | #endif /* HAVE_POSIX_SPAWN */ | |
786 | ||
787 | if (*pid) | |
e00b005a | 788 | { |
789 | if (!process_array) | |
790 | process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL); | |
f3c17241 | 791 | |
e00b005a | 792 | if (process_array) |
793 | { | |
794 | if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL) | |
795 | { | |
b9faaae1 | 796 | proc->pid = *pid; |
38e73f87 | 797 | proc->job_id = job ? job->id : 0; |
e60ec91f | 798 | _cups_strcpy(proc->name, command); |
e00b005a | 799 | |
800 | cupsArrayAdd(process_array, proc); | |
801 | } | |
802 | } | |
803 | } | |
ef416fc2 | 804 | |
b9faaae1 MS |
805 | cupsdLogMessage(CUPSD_LOG_DEBUG2, |
806 | "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, " | |
807 | "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, " | |
38e73f87 | 808 | "profile=%p, job=%p(%d), pid=%p) = %d", |
b9faaae1 | 809 | command, argv, envp, infd, outfd, errfd, backfd, sidefd, |
38e73f87 | 810 | root, profile, job, job ? job->id : 0, pid, *pid); |
b9faaae1 | 811 | |
ef416fc2 | 812 | return (*pid); |
813 | } | |
814 | ||
815 | ||
816 | /* | |
e00b005a | 817 | * 'compare_procs()' - Compare two processes. |
818 | */ | |
819 | ||
820 | static int /* O - Result of comparison */ | |
821 | compare_procs(cupsd_proc_t *a, /* I - First process */ | |
822 | cupsd_proc_t *b) /* I - Second process */ | |
823 | { | |
824 | return (a->pid - b->pid); | |
825 | } | |
826 | ||
827 | ||
a4924f6c MS |
828 | #ifdef HAVE_SANDBOX_H |
829 | /* | |
830 | * 'cupsd_requote()' - Make a regular-expression version of a string. | |
831 | */ | |
832 | ||
833 | static char * /* O - Quoted string */ | |
834 | cupsd_requote(char *dst, /* I - Destination buffer */ | |
835 | const char *src, /* I - Source string */ | |
836 | size_t dstsize) /* I - Size of destination buffer */ | |
837 | { | |
838 | int ch; /* Current character */ | |
839 | char *dstptr, /* Current position in buffer */ | |
840 | *dstend; /* End of destination buffer */ | |
841 | ||
842 | ||
843 | dstptr = dst; | |
844 | dstend = dst + dstsize - 2; | |
845 | ||
846 | while (*src && dstptr < dstend) | |
847 | { | |
848 | ch = *src++; | |
849 | ||
cb7f98ee MS |
850 | if (ch == '/' && !*src) |
851 | break; /* Don't add trailing slash */ | |
852 | ||
a4924f6c MS |
853 | if (strchr(".?*()[]^$\\", ch)) |
854 | *dstptr++ = '\\'; | |
855 | ||
7e86f2f6 | 856 | *dstptr++ = (char)ch; |
a4924f6c MS |
857 | } |
858 | ||
859 | *dstptr = '\0'; | |
860 | ||
861 | return (dst); | |
862 | } | |
863 | #endif /* HAVE_SANDBOX_H */ | |
864 | ||
865 | ||
e00b005a | 866 | /* |
f2d18633 | 867 | * End of "$Id$". |
ef416fc2 | 868 | */ |