1 /*
2 * Client routines for the CUPS scheduler.
3 *
4 * Copyright © 2007-2019 by Apple Inc.
5 * Copyright © 1997-2007 by Easy Software Products, all rights reserved.
6 *
7 * This file contains Kerberos support code, copyright 2006 by
8 * Jelmer Vernooij.
9 *
10 * Licensed under Apache License v2.0. See the file "LICENSE" for more
11 * information.
12 */
13
14 /*
15 * Include necessary headers...
16 */
17
18 #define _CUPS_NO_DEPRECATED
19 #define _HTTP_NO_PRIVATE
20 #include "cupsd.h"
21
22 #ifdef __APPLE__
23 # include <libproc.h>
24 #endif /* __APPLE__ */
25 #ifdef HAVE_TCPD_H
26 # include <tcpd.h>
27 #endif /* HAVE_TCPD_H */
28
29
30 /*
31 * Local functions...
32 */
33
34 static int check_if_modified(cupsd_client_t *con,
35 struct stat *filestats);
36 static int compare_clients(cupsd_client_t *a, cupsd_client_t *b,
37 void *data);
38 #ifdef HAVE_SSL
39 static int cupsd_start_tls(cupsd_client_t *con, http_encryption_t e);
40 #endif /* HAVE_SSL */
41 static char *get_file(cupsd_client_t *con, struct stat *filestats,
42 char *filename, size_t len);
43 static http_status_t install_cupsd_conf(cupsd_client_t *con);
44 static int is_cgi(cupsd_client_t *con, const char *filename,
45 struct stat *filestats, mime_type_t *type);
46 static int is_path_absolute(const char *path);
47 static int pipe_command(cupsd_client_t *con, int infile, int *outfile,
48 char *command, char *options, int root);
49 static int valid_host(cupsd_client_t *con);
50 static int write_file(cupsd_client_t *con, http_status_t code,
51 char *filename, char *type,
52 struct stat *filestats);
53 static void write_pipe(cupsd_client_t *con);
54
55
56 /*
57 * 'cupsdAcceptClient()' - Accept a new client.
58 */
59
60 void
cupsdAcceptClient(cupsd_listener_t * lis)61 cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
62 {
63 const char *hostname; /* Hostname of client */
64 char name[256]; /* Hostname of client */
65 int count; /* Count of connections on a host */
66 cupsd_client_t *con, /* New client pointer */
67 *tempcon; /* Temporary client pointer */
68 socklen_t addrlen; /* Length of address */
69 http_addr_t temp; /* Temporary address variable */
70 static time_t last_dos = 0; /* Time of last DoS attack */
71 #ifdef HAVE_TCPD_H
72 struct request_info wrap_req; /* TCP wrappers request information */
73 #endif /* HAVE_TCPD_H */
74
75
76 cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAcceptClient(lis=%p(%d)) Clients=%d", lis, lis->fd, cupsArrayCount(Clients));
77
78 /*
79 * Make sure we don't have a full set of clients already...
80 */
81
82 if (cupsArrayCount(Clients) == MaxClients)
83 return;
84
85 cupsdSetBusyState(1);
86
87 /*
88 * Get a pointer to the next available client...
89 */
90
91 if (!Clients)
92 Clients = cupsArrayNew(NULL, NULL);
93
94 if (!Clients)
95 {
96 cupsdLogMessage(CUPSD_LOG_ERROR,
97 "Unable to allocate memory for clients array!");
98 cupsdPauseListening();
99 return;
100 }
101
102 if (!ActiveClients)
103 ActiveClients = cupsArrayNew((cups_array_func_t)compare_clients, NULL);
104
105 if (!ActiveClients)
106 {
107 cupsdLogMessage(CUPSD_LOG_ERROR,
108 "Unable to allocate memory for active clients array!");
109 cupsdPauseListening();
110 return;
111 }
112
113 if ((con = calloc(1, sizeof(cupsd_client_t))) == NULL)
114 {
115 cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for client!");
116 cupsdPauseListening();
117 return;
118 }
119
120 /*
121 * Accept the client and get the remote address...
122 */
123
124 con->number = ++ LastClientNumber;
125 con->file = -1;
126
127 if ((con->http = httpAcceptConnection(lis->fd, 0)) == NULL)
128 {
129 if (errno == ENFILE || errno == EMFILE)
130 cupsdPauseListening();
131
132 cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to accept client connection - %s.",
133 strerror(errno));
134 free(con);
135
136 return;
137 }
138
139 /*
140 * Save the connected address and port number...
141 */
142
143 addrlen = sizeof(con->clientaddr);
144
145 if (getsockname(httpGetFd(con->http), (struct sockaddr *)&con->clientaddr, &addrlen) || addrlen == 0)
146 con->clientaddr = lis->address;
147
148 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Server address is \"%s\".", httpAddrString(&con->clientaddr, name, sizeof(name)));
149
150 /*
151 * Check the number of clients on the same address...
152 */
153
154 for (count = 0, tempcon = (cupsd_client_t *)cupsArrayFirst(Clients);
155 tempcon;
156 tempcon = (cupsd_client_t *)cupsArrayNext(Clients))
157 if (httpAddrEqual(httpGetAddress(tempcon->http), httpGetAddress(con->http)))
158 {
159 count ++;
160 if (count >= MaxClientsPerHost)
161 break;
162 }
163
164 if (count >= MaxClientsPerHost)
165 {
166 if ((time(NULL) - last_dos) >= 60)
167 {
168 last_dos = time(NULL);
169 cupsdLogMessage(CUPSD_LOG_WARN,
170 "Possible DoS attack - more than %d clients connecting "
171 "from %s.",
172 MaxClientsPerHost,
173 httpGetHostname(con->http, name, sizeof(name)));
174 }
175
176 httpClose(con->http);
177 free(con);
178 return;
179 }
180
181 /*
182 * Get the hostname or format the IP address as needed...
183 */
184
185 if (HostNameLookups)
186 hostname = httpResolveHostname(con->http, NULL, 0);
187 else
188 hostname = httpGetHostname(con->http, NULL, 0);
189
190 if (hostname == NULL && HostNameLookups == 2)
191 {
192 /*
193 * Can't have an unresolved IP address with double-lookups enabled...
194 */
195
196 httpClose(con->http);
197
198 cupsdLogClient(con, CUPSD_LOG_WARN,
199 "Name lookup failed - connection from %s closed!",
200 httpGetHostname(con->http, NULL, 0));
201
202 free(con);
203 return;
204 }
205
206 if (HostNameLookups == 2)
207 {
208 /*
209 * Do double lookups as needed...
210 */
211
212 http_addrlist_t *addrlist, /* List of addresses */
213 *addr; /* Current address */
214
215 if ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, NULL)) != NULL)
216 {
217 /*
218 * See if the hostname maps to the same IP address...
219 */
220
221 for (addr = addrlist; addr; addr = addr->next)
222 if (httpAddrEqual(httpGetAddress(con->http), &(addr->addr)))
223 break;
224 }
225 else
226 addr = NULL;
227
228 httpAddrFreeList(addrlist);
229
230 if (!addr)
231 {
232 /*
233 * Can't have a hostname that doesn't resolve to the same IP address
234 * with double-lookups enabled...
235 */
236
237 httpClose(con->http);
238
239 cupsdLogClient(con, CUPSD_LOG_WARN,
240 "IP lookup failed - connection from %s closed!",
241 httpGetHostname(con->http, NULL, 0));
242 free(con);
243 return;
244 }
245 }
246
247 #ifdef HAVE_TCPD_H
248 /*
249 * See if the connection is denied by TCP wrappers...
250 */
251
252 request_init(&wrap_req, RQ_DAEMON, "cupsd", RQ_FILE, httpGetFd(con->http),
253 NULL);
254 fromhost(&wrap_req);
255
256 if (!hosts_access(&wrap_req))
257 {
258 httpClose(con->http);
259
260 cupsdLogClient(con, CUPSD_LOG_WARN,
261 "Connection from %s refused by /etc/hosts.allow and "
262 "/etc/hosts.deny rules.", httpGetHostname(con->http, NULL, 0));
263 free(con);
264 return;
265 }
266 #endif /* HAVE_TCPD_H */
267
268 #ifdef AF_LOCAL
269 if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
270 {
271 # ifdef __APPLE__
272 socklen_t peersize; /* Size of peer credentials */
273 pid_t peerpid; /* Peer process ID */
274 char peername[256]; /* Name of process */
275
276 peersize = sizeof(peerpid);
277 if (!getsockopt(httpGetFd(con->http), SOL_LOCAL, LOCAL_PEERPID, &peerpid,
278 &peersize))
279 {
280 if (!proc_name((int)peerpid, peername, sizeof(peername)))
281 cupsdLogClient(con, CUPSD_LOG_DEBUG,
282 "Accepted from %s (Domain ???[%d])",
283 httpGetHostname(con->http, NULL, 0), (int)peerpid);
284 else
285 cupsdLogClient(con, CUPSD_LOG_DEBUG,
286 "Accepted from %s (Domain %s[%d])",
287 httpGetHostname(con->http, NULL, 0), peername, (int)peerpid);
288 }
289 else
290 # endif /* __APPLE__ */
291
292 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s (Domain)",
293 httpGetHostname(con->http, NULL, 0));
294 }
295 else
296 #endif /* AF_LOCAL */
297 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s:%d (IPv%d)",
298 httpGetHostname(con->http, NULL, 0),
299 httpAddrPort(httpGetAddress(con->http)),
300 httpAddrFamily(httpGetAddress(con->http)) == AF_INET ? 4 : 6);
301
302 /*
303 * Get the local address the client connected to...
304 */
305
306 addrlen = sizeof(temp);
307 if (getsockname(httpGetFd(con->http), (struct sockaddr *)&temp, &addrlen))
308 {
309 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get local address - %s",
310 strerror(errno));
311
312 strlcpy(con->servername, "localhost", sizeof(con->servername));
313 con->serverport = LocalPort;
314 }
315 #ifdef AF_LOCAL
316 else if (httpAddrFamily(&temp) == AF_LOCAL)
317 {
318 strlcpy(con->servername, "localhost", sizeof(con->servername));
319 con->serverport = LocalPort;
320 }
321 #endif /* AF_LOCAL */
322 else
323 {
324 if (httpAddrLocalhost(&temp))
325 strlcpy(con->servername, "localhost", sizeof(con->servername));
326 else if (HostNameLookups)
327 httpAddrLookup(&temp, con->servername, sizeof(con->servername));
328 else
329 httpAddrString(&temp, con->servername, sizeof(con->servername));
330
331 con->serverport = httpAddrPort(&(lis->address));
332 }
333
334 /*
335 * Add the connection to the array of active clients...
336 */
337
338 cupsArrayAdd(Clients, con);
339
340 /*
341 * Add the socket to the server select.
342 */
343
344 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL,
345 con);
346
347 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
348
349 /*
350 * Temporarily suspend accept()'s until we lose a client...
351 */
352
353 if (cupsArrayCount(Clients) == MaxClients)
354 cupsdPauseListening();
355
356 #ifdef HAVE_SSL
357 /*
358 * See if we are connecting on a secure port...
359 */
360
361 if (lis->encryption == HTTP_ENCRYPTION_ALWAYS)
362 {
363 /*
364 * https connection; go secure...
365 */
366
367 if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
368 cupsdCloseClient(con);
369 }
370 else
371 con->auto_ssl = 1;
372 #endif /* HAVE_SSL */
373 }
374
375
376 /*
377 * 'cupsdCloseAllClients()' - Close all remote clients immediately.
378 */
379
380 void
cupsdCloseAllClients(void)381 cupsdCloseAllClients(void)
382 {
383 cupsd_client_t *con; /* Current client */
384
385
386 cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCloseAllClients() Clients=%d", cupsArrayCount(Clients));
387
388 for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
389 con;
390 con = (cupsd_client_t *)cupsArrayNext(Clients))
391 if (cupsdCloseClient(con))
392 cupsdCloseClient(con);
393 }
394
395
396 /*
397 * 'cupsdCloseClient()' - Close a remote client.
398 */
399
400 int /* O - 1 if partial close, 0 if fully closed */
cupsdCloseClient(cupsd_client_t * con)401 cupsdCloseClient(cupsd_client_t *con) /* I - Client to close */
402 {
403 int partial; /* Do partial close for SSL? */
404
405
406 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing connection.");
407
408 /*
409 * Flush pending writes before closing...
410 */
411
412 httpFlushWrite(con->http);
413
414 partial = 0;
415
416 if (con->pipe_pid != 0)
417 {
418 /*
419 * Stop any CGI process...
420 */
421
422 cupsdEndProcess(con->pipe_pid, 1);
423 con->pipe_pid = 0;
424 }
425
426 if (con->file >= 0)
427 {
428 cupsdRemoveSelect(con->file);
429
430 close(con->file);
431 con->file = -1;
432 }
433
434 /*
435 * Close the socket and clear the file from the input set for select()...
436 */
437
438 if (httpGetFd(con->http) >= 0)
439 {
440 cupsArrayRemove(ActiveClients, con);
441 cupsdSetBusyState(0);
442
443 #ifdef HAVE_SSL
444 /*
445 * Shutdown encryption as needed...
446 */
447
448 if (httpIsEncrypted(con->http))
449 partial = 1;
450 #endif /* HAVE_SSL */
451
452 if (partial)
453 {
454 /*
455 * Only do a partial close so that the encrypted client gets everything.
456 */
457
458 httpShutdown(con->http);
459 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient,
460 NULL, con);
461
462 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for socket close.");
463 }
464 else
465 {
466 /*
467 * Shut the socket down fully...
468 */
469
470 cupsdRemoveSelect(httpGetFd(con->http));
471 httpClose(con->http);
472 con->http = NULL;
473 }
474 }
475
476 if (!partial)
477 {
478 /*
479 * Free memory...
480 */
481
482 cupsdRemoveSelect(httpGetFd(con->http));
483
484 httpClose(con->http);
485
486 if (con->filename)
487 {
488 unlink(con->filename);
489 cupsdClearString(&con->filename);
490 }
491
492 cupsdClearString(&con->command);
493 cupsdClearString(&con->options);
494 cupsdClearString(&con->query_string);
495
496 if (con->request)
497 {
498 ippDelete(con->request);
499 con->request = NULL;
500 }
501
502 if (con->response)
503 {
504 ippDelete(con->response);
505 con->response = NULL;
506 }
507
508 if (con->language)
509 {
510 cupsLangFree(con->language);
511 con->language = NULL;
512 }
513
514 #ifdef HAVE_AUTHORIZATION_H
515 if (con->authref)
516 {
517 AuthorizationFree(con->authref, kAuthorizationFlagDefaults);
518 con->authref = NULL;
519 }
520 #endif /* HAVE_AUTHORIZATION_H */
521
522 /*
523 * Re-enable new client connections if we are going back under the
524 * limit...
525 */
526
527 if (cupsArrayCount(Clients) == MaxClients)
528 cupsdResumeListening();
529
530 /*
531 * Compact the list of clients as necessary...
532 */
533
534 cupsArrayRemove(Clients, con);
535
536 free(con);
537 }
538
539 return (partial);
540 }
541
542
543 /*
544 * 'cupsdReadClient()' - Read data from a client.
545 */
546
547 void
cupsdReadClient(cupsd_client_t * con)548 cupsdReadClient(cupsd_client_t *con) /* I - Client to read from */
549 {
550 char line[32768], /* Line from client... */
551 locale[64], /* Locale */
552 *ptr; /* Pointer into strings */
553 http_status_t status; /* Transfer status */
554 ipp_state_t ipp_state; /* State of IPP transfer */
555 int bytes; /* Number of bytes to POST */
556 char *filename; /* Name of file for GET/HEAD */
557 char buf[1024]; /* Buffer for real filename */
558 struct stat filestats; /* File information */
559 mime_type_t *type; /* MIME type of file */
560 static unsigned request_id = 0; /* Request ID for temp files */
561
562
563 status = HTTP_STATUS_CONTINUE;
564
565 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdReadClient: error=%d, used=%d, state=%s, data_encoding=HTTP_ENCODING_%s, data_remaining=" CUPS_LLFMT ", request=%p(%s), file=%d", httpError(con->http), (int)httpGetReady(con->http), httpStateString(httpGetState(con->http)), httpIsChunked(con->http) ? "CHUNKED" : "LENGTH", CUPS_LLCAST httpGetRemaining(con->http), con->request, con->request ? ippStateString(ippGetState(con->request)) : "", con->file);
566
567 if (httpError(con->http) == EPIPE && !httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
568 {
569 /*
570 * Connection closed...
571 */
572
573 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
574 cupsdCloseClient(con);
575 return;
576 }
577
578 if (httpGetState(con->http) == HTTP_STATE_GET_SEND ||
579 httpGetState(con->http) == HTTP_STATE_POST_SEND ||
580 httpGetState(con->http) == HTTP_STATE_STATUS)
581 {
582 /*
583 * If we get called in the wrong state, then something went wrong with the
584 * connection and we need to shut it down...
585 */
586
587 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP read state %s.", httpStateString(httpGetState(con->http)));
588 cupsdCloseClient(con);
589 return;
590 }
591
592 #ifdef HAVE_SSL
593 if (con->auto_ssl)
594 {
595 /*
596 * Automatically check for a SSL/TLS handshake...
597 */
598
599 con->auto_ssl = 0;
600
601 if (recv(httpGetFd(con->http), buf, 1, MSG_PEEK) == 1 &&
602 (!buf[0] || !strchr("DGHOPT", buf[0])))
603 {
604 /*
605 * Encrypt this connection...
606 */
607
608 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "Saw first byte %02X, auto-negotiating SSL/TLS session.", buf[0] & 255);
609
610 if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
611 cupsdCloseClient(con);
612
613 return;
614 }
615 }
616 #endif /* HAVE_SSL */
617
618 switch (httpGetState(con->http))
619 {
620 case HTTP_STATE_WAITING :
621 /*
622 * See if we've received a request line...
623 */
624
625 con->operation = httpReadRequest(con->http, con->uri, sizeof(con->uri));
626 if (con->operation == HTTP_STATE_ERROR ||
627 con->operation == HTTP_STATE_UNKNOWN_METHOD ||
628 con->operation == HTTP_STATE_UNKNOWN_VERSION)
629 {
630 if (httpError(con->http))
631 cupsdLogClient(con, CUPSD_LOG_DEBUG,
632 "HTTP_STATE_WAITING Closing for error %d (%s)",
633 httpError(con->http), strerror(httpError(con->http)));
634 else
635 cupsdLogClient(con, CUPSD_LOG_DEBUG,
636 "HTTP_STATE_WAITING Closing on error: %s",
637 cupsLastErrorString());
638
639 cupsdCloseClient(con);
640 return;
641 }
642
643 /*
644 * Ignore blank request lines...
645 */
646
647 if (con->operation == HTTP_STATE_WAITING)
648 break;
649
650 /*
651 * Clear other state variables...
652 */
653
654 con->bytes = 0;
655 con->file = -1;
656 con->file_ready = 0;
657 con->pipe_pid = 0;
658 con->username[0] = '\0';
659 con->password[0] = '\0';
660
661 cupsdClearString(&con->command);
662 cupsdClearString(&con->options);
663 cupsdClearString(&con->query_string);
664
665 if (con->request)
666 {
667 ippDelete(con->request);
668 con->request = NULL;
669 }
670
671 if (con->response)
672 {
673 ippDelete(con->response);
674 con->response = NULL;
675 }
676
677 if (con->language)
678 {
679 cupsLangFree(con->language);
680 con->language = NULL;
681 }
682
683 #ifdef HAVE_GSSAPI
684 con->have_gss = 0;
685 con->gss_uid = 0;
686 #endif /* HAVE_GSSAPI */
687
688 /*
689 * Handle full URLs in the request line...
690 */
691
692 if (strcmp(con->uri, "*"))
693 {
694 char scheme[HTTP_MAX_URI], /* Method/scheme */
695 userpass[HTTP_MAX_URI], /* Username:password */
696 hostname[HTTP_MAX_URI], /* Hostname */
697 resource[HTTP_MAX_URI]; /* Resource path */
698 int port; /* Port number */
699
700 /*
701 * Separate the URI into its components...
702 */
703
704 if (httpSeparateURI(HTTP_URI_CODING_MOST, con->uri,
705 scheme, sizeof(scheme),
706 userpass, sizeof(userpass),
707 hostname, sizeof(hostname), &port,
708 resource, sizeof(resource)) < HTTP_URI_STATUS_OK)
709 {
710 cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
711 con->uri);
712 cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
713 cupsdCloseClient(con);
714 return;
715 }
716
717 /*
718 * Only allow URIs with the servername, localhost, or an IP
719 * address...
720 */
721
722 if (strcmp(scheme, "file") &&
723 _cups_strcasecmp(hostname, ServerName) &&
724 _cups_strcasecmp(hostname, "localhost") &&
725 !cupsArrayFind(ServerAlias, hostname) &&
726 !isdigit(hostname[0]) && hostname[0] != '[')
727 {
728 /*
729 * Nope, we don't do proxies...
730 */
731
732 cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
733 con->uri);
734 cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
735 cupsdCloseClient(con);
736 return;
737 }
738
739 /*
740 * Copy the resource portion back into the URI; both resource and
741 * con->uri are HTTP_MAX_URI bytes in size...
742 */
743
744 strlcpy(con->uri, resource, sizeof(con->uri));
745 }
746
747 /*
748 * Process the request...
749 */
750
751 gettimeofday(&(con->start), NULL);
752
753 cupsdLogClient(con, CUPSD_LOG_DEBUG, "%s %s HTTP/%d.%d",
754 httpStateString(con->operation) + 11, con->uri,
755 httpGetVersion(con->http) / 100,
756 httpGetVersion(con->http) % 100);
757
758 if (!cupsArrayFind(ActiveClients, con))
759 {
760 cupsArrayAdd(ActiveClients, con);
761 cupsdSetBusyState(0);
762 }
763
764 case HTTP_STATE_OPTIONS :
765 case HTTP_STATE_DELETE :
766 case HTTP_STATE_GET :
767 case HTTP_STATE_HEAD :
768 case HTTP_STATE_POST :
769 case HTTP_STATE_PUT :
770 case HTTP_STATE_TRACE :
771 /*
772 * Parse incoming parameters until the status changes...
773 */
774
775 while ((status = httpUpdate(con->http)) == HTTP_STATUS_CONTINUE)
776 if (!httpGetReady(con->http))
777 break;
778
779 if (status != HTTP_STATUS_OK && status != HTTP_STATUS_CONTINUE)
780 {
781 if (httpError(con->http) && httpError(con->http) != EPIPE)
782 cupsdLogClient(con, CUPSD_LOG_DEBUG,
783 "Closing for error %d (%s) while reading headers.",
784 httpError(con->http), strerror(httpError(con->http)));
785 else
786 cupsdLogClient(con, CUPSD_LOG_DEBUG,
787 "Closing on EOF while reading headers.");
788
789 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
790 cupsdCloseClient(con);
791 return;
792 }
793 break;
794
795 default :
796 if (!httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
797 {
798 /*
799 * Connection closed...
800 */
801
802 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
803 cupsdCloseClient(con);
804 return;
805 }
806 break; /* Anti-compiler-warning-code */
807 }
808
809 /*
810 * Handle new transfers...
811 */
812
813 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Read: status=%d, state=%d", status, httpGetState(con->http));
814
815 if (status == HTTP_STATUS_OK)
816 {
817 /*
818 * Record whether the client is a web browser. "Mozilla" was the original
819 * and it seems that every web browser in existence now uses that as the
820 * prefix with additional information identifying *which* browser.
821 *
822 * Chrome (at least) has problems with multiple WWW-Authenticate values in
823 * a single header, so we only report Basic or Negotiate to web browsers and
824 * leave the multiple choices to the native CUPS client...
825 */
826
827 con->is_browser = !strncmp(httpGetField(con->http, HTTP_FIELD_USER_AGENT), "Mozilla/", 8);
828
829 if (httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE)[0])
830 {
831 /*
832 * Figure out the locale from the Accept-Language and Content-Type
833 * fields...
834 */
835
836 if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
837 ',')) != NULL)
838 *ptr = '\0';
839
840 if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
841 ';')) != NULL)
842 *ptr = '\0';
843
844 if ((ptr = strstr(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE),
845 "charset=")) != NULL)
846 {
847 /*
848 * Combine language and charset, and trim any extra params in the
849 * content-type.
850 */
851
852 snprintf(locale, sizeof(locale), "%s.%s",
853 httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE), ptr + 8);
854
855 if ((ptr = strchr(locale, ',')) != NULL)
856 *ptr = '\0';
857 }
858 else
859 snprintf(locale, sizeof(locale), "%s.UTF-8",
860 httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE));
861
862 con->language = cupsLangGet(locale);
863 }
864 else
865 con->language = cupsLangGet(DefaultLocale);
866
867 cupsdAuthorize(con);
868
869 if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
870 "Keep-Alive", 10) && KeepAlive)
871 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_ON);
872 else if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
873 "close", 5))
874 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
875
876 if (!httpGetField(con->http, HTTP_FIELD_HOST)[0] &&
877 httpGetVersion(con->http) >= HTTP_VERSION_1_1)
878 {
879 /*
880 * HTTP/1.1 and higher require the "Host:" field...
881 */
882
883 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
884 {
885 cupsdLogClient(con, CUPSD_LOG_ERROR, "Missing Host: field in request.");
886 cupsdCloseClient(con);
887 return;
888 }
889 }
890 else if (!valid_host(con))
891 {
892 /*
893 * Access to localhost must use "localhost" or the corresponding IPv4
894 * or IPv6 values in the Host: field.
895 */
896
897 cupsdLogClient(con, CUPSD_LOG_ERROR,
898 "Request from \"%s\" using invalid Host: field \"%s\".",
899 httpGetHostname(con->http, NULL, 0), httpGetField(con->http, HTTP_FIELD_HOST));
900
901 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
902 {
903 cupsdCloseClient(con);
904 return;
905 }
906 }
907 else if (con->operation == HTTP_STATE_OPTIONS)
908 {
909 /*
910 * Do OPTIONS command...
911 */
912
913 if (con->best && con->best->type != CUPSD_AUTH_NONE)
914 {
915 httpClearFields(con->http);
916
917 if (!cupsdSendHeader(con, HTTP_STATUS_UNAUTHORIZED, NULL, CUPSD_AUTH_NONE))
918 {
919 cupsdCloseClient(con);
920 return;
921 }
922 }
923
924 if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION), "Upgrade") && strstr(httpGetField(con->http, HTTP_FIELD_UPGRADE), "TLS/") != NULL && !httpIsEncrypted(con->http))
925 {
926 #ifdef HAVE_SSL
927 /*
928 * Do encryption stuff...
929 */
930
931 httpClearFields(con->http);
932
933 if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL, CUPSD_AUTH_NONE))
934 {
935 cupsdCloseClient(con);
936 return;
937 }
938
939 if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
940 {
941 cupsdCloseClient(con);
942 return;
943 }
944 #else
945 if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
946 {
947 cupsdCloseClient(con);
948 return;
949 }
950 #endif /* HAVE_SSL */
951 }
952
953 httpClearFields(con->http);
954 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
955
956 if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
957 {
958 cupsdCloseClient(con);
959 return;
960 }
961 }
962 else if (!is_path_absolute(con->uri))
963 {
964 /*
965 * Protect against malicious users!
966 */
967
968 cupsdLogClient(con, CUPSD_LOG_ERROR,
969 "Request for non-absolute resource \"%s\".", con->uri);
970
971 if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
972 {
973 cupsdCloseClient(con);
974 return;
975 }
976 }
977 else
978 {
979 if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
980 "Upgrade") && !httpIsEncrypted(con->http))
981 {
982 #ifdef HAVE_SSL
983 /*
984 * Do encryption stuff...
985 */
986
987 httpClearFields(con->http);
988
989 if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL,
990 CUPSD_AUTH_NONE))
991 {
992 cupsdCloseClient(con);
993 return;
994 }
995
996 if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
997 {
998 cupsdCloseClient(con);
999 return;
1000 }
1001 #else
1002 if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
1003 {
1004 cupsdCloseClient(con);
1005 return;
1006 }
1007 #endif /* HAVE_SSL */
1008 }
1009
1010 if ((status = cupsdIsAuthorized(con, NULL)) != HTTP_STATUS_OK)
1011 {
1012 cupsdSendError(con, status, CUPSD_AUTH_NONE);
1013 cupsdCloseClient(con);
1014 return;
1015 }
1016
1017 if (httpGetExpect(con->http) &&
1018 (con->operation == HTTP_STATE_POST || con->operation == HTTP_STATE_PUT))
1019 {
1020 if (httpGetExpect(con->http) == HTTP_STATUS_CONTINUE)
1021 {
1022 /*
1023 * Send 100-continue header...
1024 */
1025
1026 if (httpWriteResponse(con->http, HTTP_STATUS_CONTINUE))
1027 {
1028 cupsdCloseClient(con);
1029 return;
1030 }
1031 }
1032 else
1033 {
1034 /*
1035 * Send 417-expectation-failed header...
1036 */
1037
1038 httpClearFields(con->http);
1039 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
1040
1041 cupsdSendError(con, HTTP_STATUS_EXPECTATION_FAILED, CUPSD_AUTH_NONE);
1042 cupsdCloseClient(con);
1043 return;
1044 }
1045 }
1046
1047 switch (httpGetState(con->http))
1048 {
1049 case HTTP_STATE_GET_SEND :
1050 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Processing GET %s", con->uri);
1051
1052 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1053 {
1054 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1055
1056 cupsdLogClient(con, CUPSD_LOG_DEBUG, "filename=\"%s\", type=%s/%s", filename, type ? type->super : "", type ? type->type : "");
1057
1058 if (is_cgi(con, filename, &filestats, type))
1059 {
1060 /*
1061 * Note: con->command and con->options were set by is_cgi()...
1062 */
1063
1064 if (!cupsdSendCommand(con, con->command, con->options, 0))
1065 {
1066 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1067 {
1068 cupsdCloseClient(con);
1069 return;
1070 }
1071 }
1072 else
1073 cupsdLogRequest(con, HTTP_STATUS_OK);
1074
1075 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1076 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1077 break;
1078 }
1079
1080 if (!check_if_modified(con, &filestats))
1081 {
1082 if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
1083 {
1084 cupsdCloseClient(con);
1085 return;
1086 }
1087 }
1088 else
1089 {
1090 if (type == NULL)
1091 strlcpy(line, "text/plain", sizeof(line));
1092 else
1093 snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
1094
1095 if (!write_file(con, HTTP_STATUS_OK, filename, line, &filestats))
1096 {
1097 cupsdCloseClient(con);
1098 return;
1099 }
1100 }
1101 }
1102 else if (!buf[0] && (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9)))
1103 {
1104 if (!WebInterface)
1105 {
1106 /*
1107 * Web interface is disabled. Show an appropriate message...
1108 */
1109
1110 if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
1111 {
1112 cupsdCloseClient(con);
1113 return;
1114 }
1115
1116 break;
1117 }
1118
1119 /*
1120 * Send CGI output...
1121 */
1122
1123 if (!strncmp(con->uri, "/admin", 6))
1124 {
1125 cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
1126 cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
1127 }
1128 else if (!strncmp(con->uri, "/classes", 8))
1129 {
1130 cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
1131 if (con->uri[8] && con->uri[9])
1132 cupsdSetString(&con->options, con->uri + 8);
1133 else
1134 cupsdSetString(&con->options, NULL);
1135 }
1136 else if (!strncmp(con->uri, "/jobs", 5))
1137 {
1138 cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
1139 if (con->uri[5] && con->uri[6])
1140 cupsdSetString(&con->options, con->uri + 5);
1141 else
1142 cupsdSetString(&con->options, NULL);
1143 }
1144 else if (!strncmp(con->uri, "/printers", 9))
1145 {
1146 cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
1147 if (con->uri[9] && con->uri[10])
1148 cupsdSetString(&con->options, con->uri + 9);
1149 else
1150 cupsdSetString(&con->options, NULL);
1151 }
1152 else
1153 {
1154 cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
1155 if (con->uri[5] && con->uri[6])
1156 cupsdSetString(&con->options, con->uri + 5);
1157 else
1158 cupsdSetString(&con->options, NULL);
1159 }
1160
1161 if (!cupsdSendCommand(con, con->command, con->options, 0))
1162 {
1163 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1164 {
1165 cupsdCloseClient(con);
1166 return;
1167 }
1168 }
1169 else
1170 cupsdLogRequest(con, HTTP_STATUS_OK);
1171
1172 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1173 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1174 }
1175 else
1176 {
1177 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1178 {
1179 cupsdCloseClient(con);
1180 return;
1181 }
1182 }
1183 break;
1184
1185 case HTTP_STATE_POST_RECV :
1186 /*
1187 * See if the POST request includes a Content-Length field, and if
1188 * so check the length against any limits that are set...
1189 */
1190
1191 if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
1192 {
1193 /*
1194 * Request too large...
1195 */
1196
1197 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1198 {
1199 cupsdCloseClient(con);
1200 return;
1201 }
1202
1203 break;
1204 }
1205 else if (httpGetLength2(con->http) < 0)
1206 {
1207 /*
1208 * Negative content lengths are invalid!
1209 */
1210
1211 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
1212 {
1213 cupsdCloseClient(con);
1214 return;
1215 }
1216
1217 break;
1218 }
1219
1220 /*
1221 * See what kind of POST request this is; for IPP requests the
1222 * content-type field will be "application/ipp"...
1223 */
1224
1225 if (!strcmp(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE), "application/ipp"))
1226 {
1227 con->request = ippNew();
1228 break;
1229 }
1230 else if (!WebInterface)
1231 {
1232 /*
1233 * Web interface is disabled. Show an appropriate message...
1234 */
1235
1236 if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
1237 {
1238 cupsdCloseClient(con);
1239 return;
1240 }
1241
1242 break;
1243 }
1244
1245 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1246 {
1247 /*
1248 * POST to a file...
1249 */
1250
1251 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1252
1253 if (!is_cgi(con, filename, &filestats, type))
1254 {
1255 /*
1256 * Only POST to CGI's...
1257 */
1258
1259 if (!cupsdSendError(con, HTTP_STATUS_UNAUTHORIZED, CUPSD_AUTH_NONE))
1260 {
1261 cupsdCloseClient(con);
1262 return;
1263 }
1264 }
1265 }
1266 else if (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/printers", 9) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5))
1267 {
1268 /*
1269 * CGI request...
1270 */
1271
1272 if (!strncmp(con->uri, "/admin", 6))
1273 {
1274 cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
1275 cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
1276 }
1277 else if (!strncmp(con->uri, "/printers", 9))
1278 {
1279 cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
1280 if (con->uri[9] && con->uri[10])
1281 cupsdSetString(&con->options, con->uri + 9);
1282 else
1283 cupsdSetString(&con->options, NULL);
1284 }
1285 else if (!strncmp(con->uri, "/classes", 8))
1286 {
1287 cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
1288 if (con->uri[8] && con->uri[9])
1289 cupsdSetString(&con->options, con->uri + 8);
1290 else
1291 cupsdSetString(&con->options, NULL);
1292 }
1293 else if (!strncmp(con->uri, "/jobs", 5))
1294 {
1295 cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
1296 if (con->uri[5] && con->uri[6])
1297 cupsdSetString(&con->options, con->uri + 5);
1298 else
1299 cupsdSetString(&con->options, NULL);
1300 }
1301 else
1302 {
1303 cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
1304 if (con->uri[5] && con->uri[6])
1305 cupsdSetString(&con->options, con->uri + 5);
1306 else
1307 cupsdSetString(&con->options, NULL);
1308 }
1309
1310 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1311 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1312 }
1313 else
1314 {
1315 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1316 {
1317 cupsdCloseClient(con);
1318 return;
1319 }
1320 }
1321 break;
1322
1323 case HTTP_STATE_PUT_RECV :
1324 /*
1325 * Validate the resource name...
1326 */
1327
1328 if (strcmp(con->uri, "/admin/conf/cupsd.conf"))
1329 {
1330 /*
1331 * PUT can only be done to the cupsd.conf file...
1332 */
1333
1334 cupsdLogClient(con, CUPSD_LOG_ERROR, "Disallowed PUT request for \"%s\".", con->uri);
1335
1336 if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
1337 {
1338 cupsdCloseClient(con);
1339 return;
1340 }
1341
1342 break;
1343 }
1344
1345 /*
1346 * See if the PUT request includes a Content-Length field, and if
1347 * so check the length against any limits that are set...
1348 */
1349
1350 if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
1351 {
1352 /*
1353 * Request too large...
1354 */
1355
1356 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1357 {
1358 cupsdCloseClient(con);
1359 return;
1360 }
1361
1362 break;
1363 }
1364 else if (httpGetLength2(con->http) < 0)
1365 {
1366 /*
1367 * Negative content lengths are invalid!
1368 */
1369
1370 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
1371 {
1372 cupsdCloseClient(con);
1373 return;
1374 }
1375
1376 break;
1377 }
1378
1379 /*
1380 * Open a temporary file to hold the request...
1381 */
1382
1383 cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot, request_id ++);
1384 con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
1385
1386 if (con->file < 0)
1387 {
1388 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to create request file \"%s\": %s", con->filename, strerror(errno));
1389
1390 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1391 {
1392 cupsdCloseClient(con);
1393 return;
1394 }
1395 }
1396
1397 fchmod(con->file, 0640);
1398 fchown(con->file, RunUser, Group);
1399 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1400 break;
1401
1402 case HTTP_STATE_DELETE :
1403 case HTTP_STATE_TRACE :
1404 cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE);
1405 cupsdCloseClient(con);
1406 return;
1407
1408 case HTTP_STATE_HEAD :
1409 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1410 {
1411 if (!check_if_modified(con, &filestats))
1412 {
1413 if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
1414 {
1415 cupsdCloseClient(con);
1416 return;
1417 }
1418
1419 cupsdLogRequest(con, HTTP_STATUS_NOT_MODIFIED);
1420 }
1421 else
1422 {
1423 /*
1424 * Serve a file...
1425 */
1426
1427 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1428 if (type == NULL)
1429 strlcpy(line, "text/plain", sizeof(line));
1430 else
1431 snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
1432
1433 httpClearFields(con->http);
1434
1435 httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED, httpGetDateString(filestats.st_mtime));
1436 httpSetLength(con->http, (size_t)filestats.st_size);
1437
1438 if (!cupsdSendHeader(con, HTTP_STATUS_OK, line, CUPSD_AUTH_NONE))
1439 {
1440 cupsdCloseClient(con);
1441 return;
1442 }
1443
1444 cupsdLogRequest(con, HTTP_STATUS_OK);
1445 }
1446 }
1447 else if (!WebInterface)
1448 {
1449 httpClearFields(con->http);
1450
1451 if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
1452 {
1453 cupsdCloseClient(con);
1454 return;
1455 }
1456
1457 cupsdLogRequest(con, HTTP_STATUS_OK);
1458 break;
1459 }
1460
1461 if (!buf[0] && (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9)))
1462 {
1463 /*
1464 * CGI output...
1465 */
1466
1467 httpClearFields(con->http);
1468
1469 if (!cupsdSendHeader(con, HTTP_STATUS_OK, "text/html", CUPSD_AUTH_NONE))
1470 {
1471 cupsdCloseClient(con);
1472 return;
1473 }
1474
1475 cupsdLogRequest(con, HTTP_STATUS_OK);
1476 }
1477 else
1478 {
1479 httpClearFields(con->http);
1480
1481 if (!cupsdSendHeader(con, HTTP_STATUS_NOT_FOUND, "text/html", CUPSD_AUTH_NONE))
1482 {
1483 cupsdCloseClient(con);
1484 return;
1485 }
1486
1487 cupsdLogRequest(con, HTTP_STATUS_NOT_FOUND);
1488 }
1489 break;
1490
1491 default :
1492 break; /* Anti-compiler-warning-code */
1493 }
1494 }
1495 }
1496
1497 /*
1498 * Handle any incoming data...
1499 */
1500
1501 switch (httpGetState(con->http))
1502 {
1503 case HTTP_STATE_PUT_RECV :
1504 do
1505 {
1506 if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
1507 {
1508 if (httpError(con->http) && httpError(con->http) != EPIPE)
1509 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1510 "HTTP_STATE_PUT_RECV Closing for error %d (%s)",
1511 httpError(con->http), strerror(httpError(con->http)));
1512 else
1513 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1514 "HTTP_STATE_PUT_RECV Closing on EOF.");
1515
1516 cupsdCloseClient(con);
1517 return;
1518 }
1519 else if (bytes > 0)
1520 {
1521 con->bytes += bytes;
1522
1523 if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
1524 {
1525 close(con->file);
1526 con->file = -1;
1527 unlink(con->filename);
1528 cupsdClearString(&con->filename);
1529
1530 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1531 {
1532 cupsdCloseClient(con);
1533 return;
1534 }
1535 }
1536
1537 if (write(con->file, line, (size_t)bytes) < bytes)
1538 {
1539 cupsdLogClient(con, CUPSD_LOG_ERROR,
1540 "Unable to write %d bytes to \"%s\": %s", bytes,
1541 con->filename, strerror(errno));
1542
1543 close(con->file);
1544 con->file = -1;
1545 unlink(con->filename);
1546 cupsdClearString(&con->filename);
1547
1548 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1549 {
1550 cupsdCloseClient(con);
1551 return;
1552 }
1553 }
1554 }
1555 else if (httpGetState(con->http) == HTTP_STATE_PUT_RECV)
1556 {
1557 cupsdCloseClient(con);
1558 return;
1559 }
1560 }
1561 while (httpGetState(con->http) == HTTP_STATE_PUT_RECV && httpGetReady(con->http));
1562
1563 if (httpGetState(con->http) == HTTP_STATE_STATUS)
1564 {
1565 /*
1566 * End of file, see how big it is...
1567 */
1568
1569 fstat(con->file, &filestats);
1570
1571 close(con->file);
1572 con->file = -1;
1573
1574 if (filestats.st_size > MaxRequestSize &&
1575 MaxRequestSize > 0)
1576 {
1577 /*
1578 * Request is too big; remove it and send an error...
1579 */
1580
1581 unlink(con->filename);
1582 cupsdClearString(&con->filename);
1583
1584 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1585 {
1586 cupsdCloseClient(con);
1587 return;
1588 }
1589 }
1590
1591 /*
1592 * Install the configuration file...
1593 */
1594
1595 status = install_cupsd_conf(con);
1596
1597 /*
1598 * Return the status to the client...
1599 */
1600
1601 if (!cupsdSendError(con, status, CUPSD_AUTH_NONE))
1602 {
1603 cupsdCloseClient(con);
1604 return;
1605 }
1606 }
1607 break;
1608
1609 case HTTP_STATE_POST_RECV :
1610 do
1611 {
1612 if (con->request && con->file < 0)
1613 {
1614 /*
1615 * Grab any request data from the connection...
1616 */
1617
1618 if (!httpWait(con->http, 0))
1619 return;
1620
1621 if ((ipp_state = ippRead(con->http, con->request)) == IPP_STATE_ERROR)
1622 {
1623 cupsdLogClient(con, CUPSD_LOG_ERROR, "IPP read error: %s",
1624 cupsLastErrorString());
1625
1626 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
1627 cupsdCloseClient(con);
1628 return;
1629 }
1630 else if (ipp_state != IPP_STATE_DATA)
1631 {
1632 if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
1633 {
1634 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
1635 cupsdCloseClient(con);
1636 return;
1637 }
1638
1639 if (httpGetReady(con->http))
1640 continue;
1641 break;
1642 }
1643 else
1644 {
1645 cupsdLogClient(con, CUPSD_LOG_DEBUG, "%d.%d %s %d",
1646 con->request->request.op.version[0],
1647 con->request->request.op.version[1],
1648 ippOpString(con->request->request.op.operation_id),
1649 con->request->request.op.request_id);
1650 con->bytes += (off_t)ippLength(con->request);
1651 }
1652 }
1653
1654 if (con->file < 0 && httpGetState(con->http) != HTTP_STATE_POST_SEND)
1655 {
1656 /*
1657 * Create a file as needed for the request data...
1658 */
1659
1660 cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot,
1661 request_id ++);
1662 con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
1663
1664 if (con->file < 0)
1665 {
1666 cupsdLogClient(con, CUPSD_LOG_ERROR,
1667 "Unable to create request file \"%s\": %s",
1668 con->filename, strerror(errno));
1669
1670 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1671 {
1672 cupsdCloseClient(con);
1673 return;
1674 }
1675 }
1676
1677 fchmod(con->file, 0640);
1678 fchown(con->file, RunUser, Group);
1679 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1680 }
1681
1682 if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
1683 {
1684 if (!httpWait(con->http, 0))
1685 return;
1686 else if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
1687 {
1688 if (httpError(con->http) && httpError(con->http) != EPIPE)
1689 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1690 "HTTP_STATE_POST_SEND Closing for error %d (%s)",
1691 httpError(con->http), strerror(httpError(con->http)));
1692 else
1693 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1694 "HTTP_STATE_POST_SEND Closing on EOF.");
1695
1696 cupsdCloseClient(con);
1697 return;
1698 }
1699 else if (bytes > 0)
1700 {
1701 con->bytes += bytes;
1702
1703 if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
1704 {
1705 close(con->file);
1706 con->file = -1;
1707 unlink(con->filename);
1708 cupsdClearString(&con->filename);
1709
1710 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1711 {
1712 cupsdCloseClient(con);
1713 return;
1714 }
1715 }
1716
1717 if (write(con->file, line, (size_t)bytes) < bytes)
1718 {
1719 cupsdLogClient(con, CUPSD_LOG_ERROR,
1720 "Unable to write %d bytes to \"%s\": %s",
1721 bytes, con->filename, strerror(errno));
1722
1723 close(con->file);
1724 con->file = -1;
1725 unlink(con->filename);
1726 cupsdClearString(&con->filename);
1727
1728 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE,
1729 CUPSD_AUTH_NONE))
1730 {
1731 cupsdCloseClient(con);
1732 return;
1733 }
1734 }
1735 }
1736 else if (httpGetState(con->http) == HTTP_STATE_POST_RECV)
1737 return;
1738 else if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
1739 {
1740 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1741 "Closing on unexpected state %s.",
1742 httpStateString(httpGetState(con->http)));
1743 cupsdCloseClient(con);
1744 return;
1745 }
1746 }
1747 }
1748 while (httpGetState(con->http) == HTTP_STATE_POST_RECV && httpGetReady(con->http));
1749
1750 if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
1751 {
1752 if (con->file >= 0)
1753 {
1754 fstat(con->file, &filestats);
1755
1756 close(con->file);
1757 con->file = -1;
1758
1759 if (filestats.st_size > MaxRequestSize &&
1760 MaxRequestSize > 0)
1761 {
1762 /*
1763 * Request is too big; remove it and send an error...
1764 */
1765
1766 unlink(con->filename);
1767 cupsdClearString(&con->filename);
1768
1769 if (con->request)
1770 {
1771 /*
1772 * Delete any IPP request data...
1773 */
1774
1775 ippDelete(con->request);
1776 con->request = NULL;
1777 }
1778
1779 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1780 {
1781 cupsdCloseClient(con);
1782 return;
1783 }
1784 }
1785 else if (filestats.st_size == 0)
1786 {
1787 /*
1788 * Don't allow empty file...
1789 */
1790
1791 unlink(con->filename);
1792 cupsdClearString(&con->filename);
1793 }
1794
1795 if (con->command)
1796 {
1797 if (!cupsdSendCommand(con, con->command, con->options, 0))
1798 {
1799 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1800 {
1801 cupsdCloseClient(con);
1802 return;
1803 }
1804 }
1805 else
1806 cupsdLogRequest(con, HTTP_STATUS_OK);
1807 }
1808 }
1809
1810 if (con->request)
1811 {
1812 cupsdProcessIPPRequest(con);
1813
1814 if (con->filename)
1815 {
1816 unlink(con->filename);
1817 cupsdClearString(&con->filename);
1818 }
1819
1820 return;
1821 }
1822 }
1823 break;
1824
1825 default :
1826 break; /* Anti-compiler-warning-code */
1827 }
1828
1829 if (httpGetState(con->http) == HTTP_STATE_WAITING)
1830 {
1831 if (!httpGetKeepAlive(con->http))
1832 {
1833 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1834 "Closing because Keep-Alive is disabled.");
1835 cupsdCloseClient(con);
1836 }
1837 else
1838 {
1839 cupsArrayRemove(ActiveClients, con);
1840 cupsdSetBusyState(0);
1841 }
1842 }
1843 }
1844
1845
1846 /*
1847 * 'cupsdSendCommand()' - Send output from a command via HTTP.
1848 */
1849
1850 int /* O - 1 on success, 0 on failure */
cupsdSendCommand(cupsd_client_t * con,char * command,char * options,int root)1851 cupsdSendCommand(
1852 cupsd_client_t *con, /* I - Client connection */
1853 char *command, /* I - Command to run */
1854 char *options, /* I - Command-line options */
1855 int root) /* I - Run as root? */
1856 {
1857 int fd; /* Standard input file descriptor */
1858
1859
1860 if (con->filename)
1861 {
1862 fd = open(con->filename, O_RDONLY);
1863
1864 if (fd < 0)
1865 {
1866 cupsdLogClient(con, CUPSD_LOG_ERROR,
1867 "Unable to open \"%s\" for reading: %s",
1868 con->filename ? con->filename : "/dev/null",
1869 strerror(errno));
1870 return (0);
1871 }
1872
1873 fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
1874 }
1875 else
1876 fd = -1;
1877
1878 con->pipe_pid = pipe_command(con, fd, &(con->file), command, options, root);
1879 con->pipe_status = HTTP_STATUS_OK;
1880
1881 httpClearFields(con->http);
1882
1883 if (fd >= 0)
1884 close(fd);
1885
1886 cupsdLogClient(con, CUPSD_LOG_INFO, "Started \"%s\" (pid=%d, file=%d)",
1887 command, con->pipe_pid, con->file);
1888
1889 if (con->pipe_pid == 0)
1890 return (0);
1891
1892 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1893
1894 cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
1895
1896 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
1897
1898 con->sent_header = 0;
1899 con->file_ready = 0;
1900 con->got_fields = 0;
1901 con->header_used = 0;
1902
1903 return (1);
1904 }
1905
1906
1907 /*
1908 * 'cupsdSendError()' - Send an error message via HTTP.
1909 */
1910
1911 int /* O - 1 if successful, 0 otherwise */
cupsdSendError(cupsd_client_t * con,http_status_t code,int auth_type)1912 cupsdSendError(cupsd_client_t *con, /* I - Connection */
1913 http_status_t code, /* I - Error code */
1914 int auth_type)/* I - Authentication type */
1915 {
1916 char location[HTTP_MAX_VALUE]; /* Location field */
1917
1918
1919 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendError code=%d, auth_type=%d", code, auth_type);
1920
1921 #ifdef HAVE_SSL
1922 /*
1923 * Force client to upgrade for authentication if that is how the
1924 * server is configured...
1925 */
1926
1927 if (code == HTTP_STATUS_UNAUTHORIZED &&
1928 DefaultEncryption == HTTP_ENCRYPTION_REQUIRED &&
1929 _cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost") &&
1930 !httpIsEncrypted(con->http))
1931 {
1932 code = HTTP_STATUS_UPGRADE_REQUIRED;
1933 }
1934 #endif /* HAVE_SSL */
1935
1936 /*
1937 * Put the request in the access_log file...
1938 */
1939
1940 cupsdLogRequest(con, code);
1941
1942 /*
1943 * To work around bugs in some proxies, don't use Keep-Alive for some
1944 * error messages...
1945 *
1946 * Kerberos authentication doesn't work without Keep-Alive, so
1947 * never disable it in that case.
1948 */
1949
1950 strlcpy(location, httpGetField(con->http, HTTP_FIELD_LOCATION), sizeof(location));
1951
1952 httpClearFields(con->http);
1953 httpClearCookie(con->http);
1954
1955 httpSetField(con->http, HTTP_FIELD_LOCATION, location);
1956
1957 if (code >= HTTP_STATUS_BAD_REQUEST && con->type != CUPSD_AUTH_NEGOTIATE)
1958 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1959
1960 if (httpGetVersion(con->http) >= HTTP_VERSION_1_1 &&
1961 httpGetKeepAlive(con->http) == HTTP_KEEPALIVE_OFF)
1962 httpSetField(con->http, HTTP_FIELD_CONNECTION, "close");
1963
1964 if (code >= HTTP_STATUS_BAD_REQUEST)
1965 {
1966 /*
1967 * Send a human-readable error message.
1968 */
1969
1970 char message[4096], /* Message for user */
1971 urltext[1024], /* URL redirection text */
1972 redirect[1024]; /* Redirection link */
1973 const char *text; /* Status-specific text */
1974
1975
1976 redirect[0] = '\0';
1977
1978 if (code == HTTP_STATUS_UNAUTHORIZED)
1979 {
1980 text = _cupsLangString(con->language,
1981 _("Enter your username and password or the "
1982 "root username and password to access this "
1983 "page. If you are using Kerberos authentication, "
1984 "make sure you have a valid Kerberos ticket."));
1985 }
1986 else if (code == HTTP_STATUS_FORBIDDEN)
1987 {
1988 if (con->username[0])
1989 text = _cupsLangString(con->language, _("Your account does not have the necessary privileges."));
1990 else
1991 text = _cupsLangString(con->language, _("You cannot access this page."));
1992 }
1993 else if (code == HTTP_STATUS_UPGRADE_REQUIRED)
1994 {
1995 text = urltext;
1996
1997 snprintf(urltext, sizeof(urltext), _cupsLangString(con->language, _("You must access this page using the URL https://%s:%d%s.")), con->servername, con->serverport, con->uri);
1998
1999 snprintf(redirect, sizeof(redirect), "<META HTTP-EQUIV=\"Refresh\" CONTENT=\"3;URL=https://%s:%d%s\">\n", con->servername, con->serverport, con->uri);
2000 }
2001 else if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
2002 text = _cupsLangString(con->language,
2003 _("The web interface is currently disabled. Run "
2004 "\"cupsctl WebInterface=yes\" to enable it."));
2005 else
2006 text = "";
2007
2008 snprintf(message, sizeof(message),
2009 "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
2010 "\"http://www.w3.org/TR/html4/loose.dtd\">\n"
2011 "<HTML>\n"
2012 "<HEAD>\n"
2013 "\t<META HTTP-EQUIV=\"Content-Type\" "
2014 "CONTENT=\"text/html; charset=utf-8\">\n"
2015 "\t<TITLE>%s - " CUPS_SVERSION "</TITLE>\n"
2016 "\t<LINK REL=\"STYLESHEET\" TYPE=\"text/css\" "
2017 "HREF=\"/cups.css\">\n"
2018 "%s"
2019 "</HEAD>\n"
2020 "<BODY>\n"
2021 "<H1>%s</H1>\n"
2022 "<P>%s</P>\n"
2023 "</BODY>\n"
2024 "</HTML>\n",
2025 _httpStatus(con->language, code), redirect,
2026 _httpStatus(con->language, code), text);
2027
2028 /*
2029 * Send an error message back to the client. If the error code is a
2030 * 400 or 500 series, make sure the message contains some text, too!
2031 */
2032
2033 size_t length = strlen(message); /* Length of message */
2034
2035 httpSetLength(con->http, length);
2036
2037 if (!cupsdSendHeader(con, code, "text/html", auth_type))
2038 return (0);
2039
2040 if (httpWrite2(con->http, message, length) < 0)
2041 return (0);
2042
2043 if (httpFlushWrite(con->http) < 0)
2044 return (0);
2045 }
2046 else
2047 {
2048 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
2049
2050 if (!cupsdSendHeader(con, code, NULL, auth_type))
2051 return (0);
2052 }
2053
2054 return (1);
2055 }
2056
2057
2058 /*
2059 * 'cupsdSendHeader()' - Send an HTTP request.
2060 */
2061
2062 int /* O - 1 on success, 0 on failure */
cupsdSendHeader(cupsd_client_t * con,http_status_t code,char * type,int auth_type)2063 cupsdSendHeader(
2064 cupsd_client_t *con, /* I - Client to send to */
2065 http_status_t code, /* I - HTTP status code */
2066 char *type, /* I - MIME type of document */
2067 int auth_type) /* I - Type of authentication */
2068 {
2069 char auth_str[1024]; /* Authorization string */
2070
2071
2072 cupsdLogClient(con, CUPSD_LOG_DEBUG, "cupsdSendHeader: code=%d, type=\"%s\", auth_type=%d", code, type, auth_type);
2073
2074 /*
2075 * Send the HTTP status header...
2076 */
2077
2078 if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
2079 {
2080 /*
2081 * Treat our special "web interface is disabled" status as "200 OK" for web
2082 * browsers.
2083 */
2084
2085 code = HTTP_STATUS_OK;
2086 }
2087
2088 if (ServerHeader)
2089 httpSetField(con->http, HTTP_FIELD_SERVER, ServerHeader);
2090
2091 if (code == HTTP_STATUS_METHOD_NOT_ALLOWED)
2092 httpSetField(con->http, HTTP_FIELD_ALLOW, "GET, HEAD, OPTIONS, POST, PUT");
2093
2094 if (code == HTTP_STATUS_UNAUTHORIZED)
2095 {
2096 if (auth_type == CUPSD_AUTH_NONE)
2097 {
2098 if (!con->best || con->best->type <= CUPSD_AUTH_NONE)
2099 auth_type = cupsdDefaultAuthType();
2100 else
2101 auth_type = con->best->type;
2102 }
2103
2104 auth_str[0] = '\0';
2105
2106 if (auth_type == CUPSD_AUTH_BASIC)
2107 {
2108 strlcpy(auth_str, "Basic realm=\"CUPS\"", sizeof(auth_str));
2109 }
2110 else if (auth_type == CUPSD_AUTH_NEGOTIATE)
2111 {
2112 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
2113 if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
2114 strlcpy(auth_str, "PeerCred", sizeof(auth_str));
2115 else
2116 #endif /* SO_PEERCRED && AF_LOCAL */
2117 strlcpy(auth_str, "Negotiate", sizeof(auth_str));
2118 }
2119
2120 if (con->best && auth_type != CUPSD_AUTH_NEGOTIATE && !con->is_browser && !_cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost"))
2121 {
2122 /*
2123 * Add a "trc" (try root certification) parameter for local non-Kerberos
2124 * requests when the request requires system group membership - then the
2125 * client knows the root certificate can/should be used.
2126 *
2127 * Also, for macOS we also look for @AUTHKEY and add an "AuthRef key=foo"
2128 * method as needed...
2129 */
2130
2131 char *name, /* Current user name */
2132 *auth_key; /* Auth key buffer */
2133 size_t auth_size; /* Size of remaining buffer */
2134 int need_local = 1; /* Do we need to list "Local" method? */
2135
2136 auth_key = auth_str + strlen(auth_str);
2137 auth_size = sizeof(auth_str) - (size_t)(auth_key - auth_str);
2138
2139 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
2140 if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
2141 {
2142 strlcpy(auth_key, ", PeerCred", auth_size);
2143 auth_key += 10;
2144 auth_size -= 10;
2145 }
2146 #endif /* SO_PEERCRED && AF_LOCAL */
2147
2148 for (name = (char *)cupsArrayFirst(con->best->names);
2149 name;
2150 name = (char *)cupsArrayNext(con->best->names))
2151 {
2152 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendHeader: require \"%s\"", name);
2153
2154 #ifdef HAVE_AUTHORIZATION_H
2155 if (!_cups_strncasecmp(name, "@AUTHKEY(", 9))
2156 {
2157 snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", name + 9);
2158 need_local = 0;
2159 /* end parenthesis is stripped in conf.c */
2160 break;
2161 }
2162 else
2163 #endif /* HAVE_AUTHORIZATION_H */
2164 if (!_cups_strcasecmp(name, "@SYSTEM"))
2165 {
2166 #ifdef HAVE_AUTHORIZATION_H
2167 if (SystemGroupAuthKey)
2168 snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", SystemGroupAuthKey);
2169 else
2170 #endif /* HAVE_AUTHORIZATION_H */
2171 strlcpy(auth_key, ", Local trc=\"y\"", auth_size);
2172 need_local = 0;
2173 break;
2174 }
2175 }
2176
2177 if (need_local)
2178 strlcat(auth_key, ", Local", auth_size);
2179 }
2180
2181 if (auth_str[0])
2182 {
2183 cupsdLogClient(con, CUPSD_LOG_DEBUG, "WWW-Authenticate: %s", auth_str);
2184
2185 httpSetField(con->http, HTTP_FIELD_WWW_AUTHENTICATE, auth_str);
2186 }
2187 }
2188
2189 if (con->language && strcmp(con->language->language, "C"))
2190 httpSetField(con->http, HTTP_FIELD_CONTENT_LANGUAGE, con->language->language);
2191
2192 if (type)
2193 {
2194 if (!strcmp(type, "text/html"))
2195 httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, "text/html; charset=utf-8");
2196 else
2197 httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, type);
2198 }
2199
2200 return (!httpWriteResponse(con->http, code));
2201 }
2202
2203
2204 /*
2205 * 'cupsdUpdateCGI()' - Read status messages from CGI scripts and programs.
2206 */
2207
2208 void
cupsdUpdateCGI(void)2209 cupsdUpdateCGI(void)
2210 {
2211 char *ptr, /* Pointer to end of line in buffer */
2212 message[1024]; /* Pointer to message text */
2213 int loglevel; /* Log level for message */
2214
2215
2216 while ((ptr = cupsdStatBufUpdate(CGIStatusBuffer, &loglevel,
2217 message, sizeof(message))) != NULL)
2218 {
2219 if (loglevel == CUPSD_LOG_INFO)
2220 cupsdLogMessage(CUPSD_LOG_INFO, "%s", message);
2221
2222 if (!strchr(CGIStatusBuffer->buffer, '\n'))
2223 break;
2224 }
2225
2226 if (ptr == NULL && !CGIStatusBuffer->bufused)
2227 {
2228 /*
2229 * Fatal error on pipe - should never happen!
2230 */
2231
2232 cupsdLogMessage(CUPSD_LOG_CRIT,
2233 "cupsdUpdateCGI: error reading from CGI error pipe - %s",
2234 strerror(errno));
2235 }
2236 }
2237
2238
2239 /*
2240 * 'cupsdWriteClient()' - Write data to a client as needed.
2241 */
2242
2243 void
cupsdWriteClient(cupsd_client_t * con)2244 cupsdWriteClient(cupsd_client_t *con) /* I - Client connection */
2245 {
2246 int bytes, /* Number of bytes written */
2247 field_col; /* Current column */
2248 char *bufptr, /* Pointer into buffer */
2249 *bufend; /* Pointer to end of buffer */
2250 ipp_state_t ipp_state; /* IPP state value */
2251
2252
2253 cupsdLogClient(con, CUPSD_LOG_DEBUG, "con->http=%p", con->http);
2254 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2255 "cupsdWriteClient "
2256 "error=%d, "
2257 "used=%d, "
2258 "state=%s, "
2259 "data_encoding=HTTP_ENCODING_%s, "
2260 "data_remaining=" CUPS_LLFMT ", "
2261 "response=%p(%s), "
2262 "pipe_pid=%d, "
2263 "file=%d",
2264 httpError(con->http), (int)httpGetReady(con->http),
2265 httpStateString(httpGetState(con->http)),
2266 httpIsChunked(con->http) ? "CHUNKED" : "LENGTH",
2267 CUPS_LLCAST httpGetLength2(con->http),
2268 con->response,
2269 con->response ? ippStateString(ippGetState(con->request)) : "",
2270 con->pipe_pid, con->file);
2271
2272 if (httpGetState(con->http) != HTTP_STATE_GET_SEND &&
2273 httpGetState(con->http) != HTTP_STATE_POST_SEND)
2274 {
2275 /*
2276 * If we get called in the wrong state, then something went wrong with the
2277 * connection and we need to shut it down...
2278 */
2279
2280 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP write state %s.",
2281 httpStateString(httpGetState(con->http)));
2282 cupsdCloseClient(con);
2283 return;
2284 }
2285
2286 if (con->pipe_pid)
2287 {
2288 /*
2289 * Make sure we select on the CGI output...
2290 */
2291
2292 cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
2293
2294 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
2295
2296 if (!con->file_ready)
2297 {
2298 /*
2299 * Try again later when there is CGI output available...
2300 */
2301
2302 cupsdRemoveSelect(httpGetFd(con->http));
2303 return;
2304 }
2305
2306 con->file_ready = 0;
2307 }
2308
2309 bytes = (ssize_t)(sizeof(con->header) - (size_t)con->header_used);
2310
2311 if (!con->pipe_pid && bytes > (ssize_t)httpGetRemaining(con->http))
2312 {
2313 /*
2314 * Limit GET bytes to original size of file (STR #3265)...
2315 */
2316
2317 bytes = (ssize_t)httpGetRemaining(con->http);
2318 }
2319
2320 if (con->response && con->response->state != IPP_STATE_DATA)
2321 {
2322 size_t wused = httpGetPending(con->http); /* Previous write buffer use */
2323
2324 do
2325 {
2326 /*
2327 * Write a single attribute or the IPP message header...
2328 */
2329
2330 ipp_state = ippWrite(con->http, con->response);
2331
2332 /*
2333 * If the write buffer has been flushed, stop buffering up attributes...
2334 */
2335
2336 if (httpGetPending(con->http) <= wused)
2337 break;
2338 }
2339 while (ipp_state != IPP_STATE_DATA && ipp_state != IPP_STATE_ERROR);
2340
2341 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2342 "Writing IPP response, ipp_state=%s, old "
2343 "wused=" CUPS_LLFMT ", new wused=" CUPS_LLFMT,
2344 ippStateString(ipp_state),
2345 CUPS_LLCAST wused, CUPS_LLCAST httpGetPending(con->http));
2346
2347 if (httpGetPending(con->http) > 0)
2348 httpFlushWrite(con->http);
2349
2350 bytes = ipp_state != IPP_STATE_ERROR &&
2351 (con->file >= 0 || ipp_state != IPP_STATE_DATA);
2352
2353 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2354 "bytes=%d, http_state=%d, data_remaining=" CUPS_LLFMT,
2355 (int)bytes, httpGetState(con->http),
2356 CUPS_LLCAST httpGetLength2(con->http));
2357 }
2358 else if ((bytes = read(con->file, con->header + con->header_used, (size_t)bytes)) > 0)
2359 {
2360 con->header_used += bytes;
2361
2362 if (con->pipe_pid && !con->got_fields)
2363 {
2364 /*
2365 * Inspect the data for Content-Type and other fields.
2366 */
2367
2368 for (bufptr = con->header, bufend = con->header + con->header_used,
2369 field_col = 0;
2370 !con->got_fields && bufptr < bufend;
2371 bufptr ++)
2372 {
2373 if (*bufptr == '\n')
2374 {
2375 /*
2376 * Send line to client...
2377 */
2378
2379 if (bufptr > con->header && bufptr[-1] == '\r')
2380 bufptr[-1] = '\0';
2381 *bufptr++ = '\0';
2382
2383 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Script header: %s", con->header);
2384
2385 if (!con->sent_header)
2386 {
2387 /*
2388 * Handle redirection and CGI status codes...
2389 */
2390
2391 http_field_t field; /* HTTP field */
2392 char *value = strchr(con->header, ':');
2393 /* Value of field */
2394
2395 if (value)
2396 {
2397 *value++ = '\0';
2398 while (isspace(*value & 255))
2399 value ++;
2400 }
2401
2402 field = httpFieldValue(con->header);
2403
2404 if (field != HTTP_FIELD_UNKNOWN && value)
2405 {
2406 httpSetField(con->http, field, value);
2407
2408 if (field == HTTP_FIELD_LOCATION)
2409 {
2410 con->pipe_status = HTTP_STATUS_SEE_OTHER;
2411 con->sent_header = 2;
2412 }
2413 else
2414 con->sent_header = 1;
2415 }
2416 else if (!_cups_strcasecmp(con->header, "Status") && value)
2417 {
2418 con->pipe_status = (http_status_t)atoi(value);
2419 con->sent_header = 2;
2420 }
2421 else if (!_cups_strcasecmp(con->header, "Set-Cookie") && value)
2422 {
2423 httpSetCookie(con->http, value);
2424 con->sent_header = 1;
2425 }
2426 }
2427
2428 /*
2429 * Update buffer...
2430 */
2431
2432 con->header_used -= bufptr - con->header;
2433
2434 if (con->header_used > 0)
2435 memmove(con->header, bufptr, (size_t)con->header_used);
2436
2437 bufptr = con->header - 1;
2438
2439 /*
2440 * See if the line was empty...
2441 */
2442
2443 if (field_col == 0)
2444 {
2445 con->got_fields = 1;
2446
2447 if (httpGetVersion(con->http) == HTTP_VERSION_1_1 &&
2448 !httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0])
2449 httpSetLength(con->http, 0);
2450
2451 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending status %d for CGI.", con->pipe_status);
2452
2453 if (con->pipe_status == HTTP_STATUS_OK)
2454 {
2455 if (!cupsdSendHeader(con, con->pipe_status, NULL, CUPSD_AUTH_NONE))
2456 {
2457 cupsdCloseClient(con);
2458 return;
2459 }
2460 }
2461 else
2462 {
2463 if (!cupsdSendError(con, con->pipe_status, CUPSD_AUTH_NONE))
2464 {
2465 cupsdCloseClient(con);
2466 return;
2467 }
2468 }
2469 }
2470 else
2471 field_col = 0;
2472 }
2473 else if (*bufptr != '\r')
2474 field_col ++;
2475 }
2476
2477 if (!con->got_fields)
2478 return;
2479 }
2480
2481 if (con->header_used > 0)
2482 {
2483 if (httpWrite2(con->http, con->header, (size_t)con->header_used) < 0)
2484 {
2485 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
2486 httpError(con->http), strerror(httpError(con->http)));
2487 cupsdCloseClient(con);
2488 return;
2489 }
2490
2491 if (httpIsChunked(con->http))
2492 httpFlushWrite(con->http);
2493
2494 con->bytes += con->header_used;
2495
2496 if (httpGetState(con->http) == HTTP_STATE_WAITING)
2497 bytes = 0;
2498 else
2499 bytes = con->header_used;
2500
2501 con->header_used = 0;
2502 }
2503 }
2504
2505 if (bytes <= 0 ||
2506 (httpGetState(con->http) != HTTP_STATE_GET_SEND &&
2507 httpGetState(con->http) != HTTP_STATE_POST_SEND))
2508 {
2509 if (!con->sent_header && con->pipe_pid)
2510 cupsdSendError(con, HTTP_STATUS_SERVER_ERROR, CUPSD_AUTH_NONE);
2511 else
2512 {
2513 cupsdLogRequest(con, HTTP_STATUS_OK);
2514
2515 if (httpIsChunked(con->http) && (!con->pipe_pid || con->sent_header > 0))
2516 {
2517 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending 0-length chunk.");
2518
2519 if (httpWrite2(con->http, "", 0) < 0)
2520 {
2521 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
2522 httpError(con->http), strerror(httpError(con->http)));
2523 cupsdCloseClient(con);
2524 return;
2525 }
2526 }
2527
2528 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Flushing write buffer.");
2529 httpFlushWrite(con->http);
2530 cupsdLogClient(con, CUPSD_LOG_DEBUG, "New state is %s", httpStateString(httpGetState(con->http)));
2531 }
2532
2533 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL, con);
2534
2535 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
2536
2537 if (con->file >= 0)
2538 {
2539 cupsdRemoveSelect(con->file);
2540
2541 if (con->pipe_pid)
2542 cupsdEndProcess(con->pipe_pid, 0);
2543
2544 close(con->file);
2545 con->file = -1;
2546 con->pipe_pid = 0;
2547 }
2548
2549 if (con->filename)
2550 {
2551 unlink(con->filename);
2552 cupsdClearString(&con->filename);
2553 }
2554
2555 if (con->request)
2556 {
2557 ippDelete(con->request);
2558 con->request = NULL;
2559 }
2560
2561 if (con->response)
2562 {
2563 ippDelete(con->response);
2564 con->response = NULL;
2565 }
2566
2567 cupsdClearString(&con->command);
2568 cupsdClearString(&con->options);
2569 cupsdClearString(&con->query_string);
2570
2571 if (!httpGetKeepAlive(con->http))
2572 {
2573 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2574 "Closing because Keep-Alive is disabled.");
2575 cupsdCloseClient(con);
2576 return;
2577 }
2578 else
2579 {
2580 cupsArrayRemove(ActiveClients, con);
2581 cupsdSetBusyState(0);
2582 }
2583 }
2584 }
2585
2586
2587 /*
2588 * 'check_if_modified()' - Decode an "If-Modified-Since" line.
2589 */
2590
2591 static int /* O - 1 if modified since */
check_if_modified(cupsd_client_t * con,struct stat * filestats)2592 check_if_modified(
2593 cupsd_client_t *con, /* I - Client connection */
2594 struct stat *filestats) /* I - File information */
2595 {
2596 const char *ptr; /* Pointer into field */
2597 time_t date; /* Time/date value */
2598 off_t size; /* Size/length value */
2599
2600
2601 size = 0;
2602 date = 0;
2603 ptr = httpGetField(con->http, HTTP_FIELD_IF_MODIFIED_SINCE);
2604
2605 if (*ptr == '\0')
2606 return (1);
2607
2608 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "check_if_modified: filestats=%p(" CUPS_LLFMT ", %d)) If-Modified-Since=\"%s\"", filestats, CUPS_LLCAST filestats->st_size, (int)filestats->st_mtime, ptr);
2609
2610 while (*ptr != '\0')
2611 {
2612 while (isspace(*ptr) || *ptr == ';')
2613 ptr ++;
2614
2615 if (_cups_strncasecmp(ptr, "length=", 7) == 0)
2616 {
2617 ptr += 7;
2618 size = strtoll(ptr, NULL, 10);
2619
2620 while (isdigit(*ptr))
2621 ptr ++;
2622 }
2623 else if (isalpha(*ptr))
2624 {
2625 date = httpGetDateTime(ptr);
2626 while (*ptr != '\0' && *ptr != ';')
2627 ptr ++;
2628 }
2629 else
2630 ptr ++;
2631 }
2632
2633 return ((size != filestats->st_size && size != 0) ||
2634 (date < filestats->st_mtime && date != 0) ||
2635 (size == 0 && date == 0));
2636 }
2637
2638
2639 /*
2640 * 'compare_clients()' - Compare two client connections.
2641 */
2642
2643 static int /* O - Result of comparison */
compare_clients(cupsd_client_t * a,cupsd_client_t * b,void * data)2644 compare_clients(cupsd_client_t *a, /* I - First client */
2645 cupsd_client_t *b, /* I - Second client */
2646 void *data) /* I - User data (not used) */
2647 {
2648 (void)data;
2649
2650 if (a == b)
2651 return (0);
2652 else if (a < b)
2653 return (-1);
2654 else
2655 return (1);
2656 }
2657
2658
2659 #ifdef HAVE_SSL
2660 /*
2661 * 'cupsd_start_tls()' - Start encryption on a connection.
2662 */
2663
2664 static int /* O - 0 on success, -1 on error */
cupsd_start_tls(cupsd_client_t * con,http_encryption_t e)2665 cupsd_start_tls(cupsd_client_t *con, /* I - Client connection */
2666 http_encryption_t e) /* I - Encryption mode */
2667 {
2668 if (httpEncryption(con->http, e))
2669 {
2670 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to encrypt connection: %s",
2671 cupsLastErrorString());
2672 return (-1);
2673 }
2674
2675 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Connection now encrypted.");
2676 return (0);
2677 }
2678 #endif /* HAVE_SSL */
2679
2680
2681 /*
2682 * 'get_file()' - Get a filename and state info.
2683 */
2684
2685 static char * /* O - Real filename */
get_file(cupsd_client_t * con,struct stat * filestats,char * filename,size_t len)2686 get_file(cupsd_client_t *con, /* I - Client connection */
2687 struct stat *filestats, /* O - File information */
2688 char *filename, /* IO - Filename buffer */
2689 size_t len) /* I - Buffer length */
2690 {
2691 int status; /* Status of filesystem calls */
2692 char *ptr; /* Pointer info filename */
2693 size_t plen; /* Remaining length after pointer */
2694 char language[7], /* Language subdirectory, if any */
2695 dest[1024]; /* Destination name */
2696 int perm_check = 1; /* Do permissions check? */
2697 cupsd_printer_t *p; /* Printer */
2698
2699
2700 /*
2701 * Figure out the real filename...
2702 */
2703
2704 filename[0] = '\0';
2705 language[0] = '\0';
2706
2707 if (!strncmp(con->uri, "/help", 5) && (con->uri[5] == '/' || !con->uri[5]))
2708 {
2709 /*
2710 * All help files are served by the help.cgi program...
2711 */
2712
2713 return (NULL);
2714 }
2715 else if ((!strncmp(con->uri, "/ppd/", 5) || !strncmp(con->uri, "/printers/", 10) || !strncmp(con->uri, "/classes/", 9)) && !strcmp(con->uri + strlen(con->uri) - 4, ".ppd"))
2716 {
2717 strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
2718 dest[strlen(dest) - 4] = '\0'; /* Strip .ppd */
2719
2720 if ((p = cupsdFindDest(dest)) == NULL)
2721 {
2722 strlcpy(filename, "/", len);
2723 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2724 return (NULL);
2725 }
2726
2727 if (p->type & CUPS_PRINTER_CLASS)
2728 {
2729 int i; /* Looping var */
2730
2731 for (i = 0; i < p->num_printers; i ++)
2732 {
2733 if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
2734 {
2735 snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->printers[i]->name);
2736 if (!access(filename, 0))
2737 {
2738 p = p->printers[i];
2739 break;
2740 }
2741 }
2742 }
2743
2744 if (i >= p->num_printers)
2745 p = NULL;
2746 }
2747 else
2748 snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->name);
2749
2750 perm_check = 0;
2751 }
2752 else if ((!strncmp(con->uri, "/icons/", 7) || !strncmp(con->uri, "/printers/", 10) || !strncmp(con->uri, "/classes/", 9)) && !strcmp(con->uri + strlen(con->uri) - 4, ".png"))
2753 {
2754 strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
2755 dest[strlen(dest) - 4] = '\0'; /* Strip .png */
2756
2757 if ((p = cupsdFindDest(dest)) == NULL)
2758 {
2759 strlcpy(filename, "/", len);
2760 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2761 return (NULL);
2762 }
2763
2764 if (p->type & CUPS_PRINTER_CLASS)
2765 {
2766 int i; /* Looping var */
2767
2768 for (i = 0; i < p->num_printers; i ++)
2769 {
2770 if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
2771 {
2772 snprintf(filename, len, "%s/images/%s.png", CacheDir, p->printers[i]->name);
2773 if (!access(filename, 0))
2774 {
2775 p = p->printers[i];
2776 break;
2777 }
2778 }
2779 }
2780
2781 if (i >= p->num_printers)
2782 p = NULL;
2783 }
2784 else
2785 snprintf(filename, len, "%s/images/%s.png", CacheDir, p->name);
2786
2787 if (access(filename, F_OK) < 0)
2788 snprintf(filename, len, "%s/images/generic.png", DocumentRoot);
2789
2790 perm_check = 0;
2791 }
2792 else if (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9))
2793 {
2794 /*
2795 * Admin/class/job/printer pages are served by CGI...
2796 */
2797
2798 return (NULL);
2799 }
2800 else if (!strncmp(con->uri, "/rss/", 5) && !strchr(con->uri + 5, '/'))
2801 snprintf(filename, len, "%s/rss/%s", CacheDir, con->uri + 5);
2802 else if (!strncmp(con->uri, "/strings/", 9) && !strcmp(con->uri + strlen(con->uri) - 8, ".strings"))
2803 {
2804 strlcpy(dest, con->uri + 9, sizeof(dest));
2805 dest[strlen(dest) - 8] = '\0';
2806
2807 if ((p = cupsdFindDest(dest)) == NULL)
2808 {
2809 strlcpy(filename, "/", len);
2810 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2811 return (NULL);
2812 }
2813
2814 if (!p->strings)
2815 {
2816 strlcpy(filename, "/", len);
2817 cupsdLogClient(con, CUPSD_LOG_INFO, "No strings files for \"%s\".", dest);
2818 return (NULL);
2819 }
2820
2821 strlcpy(filename, p->strings, len);
2822
2823 perm_check = 0;
2824 }
2825 else if (!strcmp(con->uri, "/admin/conf/cupsd.conf"))
2826 {
2827 strlcpy(filename, ConfigurationFile, len);
2828
2829 perm_check = 0;
2830 }
2831 else if (!strncmp(con->uri, "/admin/log/", 11))
2832 {
2833 if (!strncmp(con->uri + 11, "access_log", 10) && AccessLog[0] == '/')
2834 strlcpy(filename, AccessLog, len);
2835 else if (!strncmp(con->uri + 11, "error_log", 9) && ErrorLog[0] == '/')
2836 strlcpy(filename, ErrorLog, len);
2837 else if (!strncmp(con->uri + 11, "page_log", 8) && PageLog[0] == '/')
2838 strlcpy(filename, PageLog, len);
2839 else
2840 return (NULL);
2841
2842 perm_check = 0;
2843 }
2844 else if (con->language)
2845 {
2846 snprintf(language, sizeof(language), "/%s", con->language->language);
2847 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
2848 }
2849 else
2850 snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
2851
2852 if ((ptr = strchr(filename, '?')) != NULL)
2853 *ptr = '\0';
2854
2855 /*
2856 * Grab the status for this language; if there isn't a language-specific file
2857 * then fallback to the default one...
2858 */
2859
2860 if ((status = lstat(filename, filestats)) != 0 && language[0] &&
2861 strncmp(con->uri, "/icons/", 7) &&
2862 strncmp(con->uri, "/ppd/", 5) &&
2863 strncmp(con->uri, "/rss/", 5) &&
2864 strncmp(con->uri, "/strings/", 9) &&
2865 strncmp(con->uri, "/admin/conf/", 12) &&
2866 strncmp(con->uri, "/admin/log/", 11))
2867 {
2868 /*
2869 * Drop the country code...
2870 */
2871
2872 language[3] = '\0';
2873 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
2874
2875 if ((ptr = strchr(filename, '?')) != NULL)
2876 *ptr = '\0';
2877
2878 if ((status = lstat(filename, filestats)) != 0)
2879 {
2880 /*
2881 * Drop the language prefix and try the root directory...
2882 */
2883
2884 language[0] = '\0';
2885 snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
2886
2887 if ((ptr = strchr(filename, '?')) != NULL)
2888 *ptr = '\0';
2889
2890 status = lstat(filename, filestats);
2891 }
2892 }
2893
2894 /*
2895 * If we've found a symlink, 404 the sucker to avoid disclosing information.
2896 */
2897
2898 if (!status && S_ISLNK(filestats->st_mode))
2899 {
2900 cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
2901 return (NULL);
2902 }
2903
2904 /*
2905 * Similarly, if the file/directory does not have world read permissions, do
2906 * not allow access...
2907 */
2908
2909 if (!status && perm_check && !(filestats->st_mode & S_IROTH))
2910 {
2911 cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
2912 return (NULL);
2913 }
2914
2915 /*
2916 * If we've found a directory, get the index.html file instead...
2917 */
2918
2919 if (!status && S_ISDIR(filestats->st_mode))
2920 {
2921 /*
2922 * Make sure the URI ends with a slash...
2923 */
2924
2925 if (con->uri[strlen(con->uri) - 1] != '/')
2926 strlcat(con->uri, "/", sizeof(con->uri));
2927
2928 /*
2929 * Find the directory index file, trying every language...
2930 */
2931
2932 do
2933 {
2934 if (status && language[0])
2935 {
2936 /*
2937 * Try a different language subset...
2938 */
2939
2940 if (language[3])
2941 language[0] = '\0'; /* Strip country code */
2942 else
2943 language[0] = '\0'; /* Strip language */
2944 }
2945
2946 /*
2947 * Look for the index file...
2948 */
2949
2950 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
2951
2952 if ((ptr = strchr(filename, '?')) != NULL)
2953 *ptr = '\0';
2954
2955 ptr = filename + strlen(filename);
2956 plen = len - (size_t)(ptr - filename);
2957
2958 strlcpy(ptr, "index.html", plen);
2959 status = lstat(filename, filestats);
2960 }
2961 while (status && language[0]);
2962
2963 /*
2964 * If we've found a symlink, 404 the sucker to avoid disclosing information.
2965 */
2966
2967 if (!status && S_ISLNK(filestats->st_mode))
2968 {
2969 cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
2970 return (NULL);
2971 }
2972
2973 /*
2974 * Similarly, if the file/directory does not have world read permissions, do
2975 * not allow access...
2976 */
2977
2978 if (!status && perm_check && !(filestats->st_mode & S_IROTH))
2979 {
2980 cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
2981 return (NULL);
2982 }
2983 }
2984
2985 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "get_file: filestats=%p, filename=%p, len=" CUPS_LLFMT ", returning \"%s\".", filestats, filename, CUPS_LLCAST len, status ? "(null)" : filename);
2986
2987 if (status)
2988 return (NULL);
2989 else
2990 return (filename);
2991 }
2992
2993
2994 /*
2995 * 'install_cupsd_conf()' - Install a configuration file.
2996 */
2997
2998 static http_status_t /* O - Status */
install_cupsd_conf(cupsd_client_t * con)2999 install_cupsd_conf(cupsd_client_t *con) /* I - Connection */
3000 {
3001 char filename[1024]; /* Configuration filename */
3002 cups_file_t *in, /* Input file */
3003 *out; /* Output file */
3004 char buffer[16384]; /* Copy buffer */
3005 ssize_t bytes; /* Number of bytes */
3006
3007
3008 /*
3009 * Open the request file...
3010 */
3011
3012 if ((in = cupsFileOpen(con->filename, "rb")) == NULL)
3013 {
3014 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to open request file \"%s\": %s",
3015 con->filename, strerror(errno));
3016 goto server_error;
3017 }
3018
3019 /*
3020 * Open the new config file...
3021 */
3022
3023 if ((out = cupsdCreateConfFile(ConfigurationFile, ConfigFilePerm)) == NULL)
3024 {
3025 cupsFileClose(in);
3026 goto server_error;
3027 }
3028
3029 cupsdLogClient(con, CUPSD_LOG_INFO, "Installing config file \"%s\"...",
3030 ConfigurationFile);
3031
3032 /*
3033 * Copy from the request to the new config file...
3034 */
3035
3036 while ((bytes = cupsFileRead(in, buffer, sizeof(buffer))) > 0)
3037 if (cupsFileWrite(out, buffer, (size_t)bytes) < bytes)
3038 {
3039 cupsdLogClient(con, CUPSD_LOG_ERROR,
3040 "Unable to copy to config file \"%s\": %s",
3041 ConfigurationFile, strerror(errno));
3042
3043 cupsFileClose(in);
3044 cupsFileClose(out);
3045
3046 snprintf(filename, sizeof(filename), "%s.N", ConfigurationFile);
3047 cupsdUnlinkOrRemoveFile(filename);
3048
3049 goto server_error;
3050 }
3051
3052 /*
3053 * Close the files...
3054 */
3055
3056 cupsFileClose(in);
3057
3058 if (cupsdCloseCreatedConfFile(out, ConfigurationFile))
3059 goto server_error;
3060
3061 /*
3062 * Remove the request file...
3063 */
3064
3065 cupsdUnlinkOrRemoveFile(con->filename);
3066 cupsdClearString(&con->filename);
3067
3068 /*
3069 * Set the NeedReload flag...
3070 */
3071
3072 NeedReload = RELOAD_CUPSD;
3073 ReloadTime = time(NULL);
3074
3075 /*
3076 * Return that the file was created successfully...
3077 */
3078
3079 return (HTTP_STATUS_CREATED);
3080
3081 /*
3082 * Common exit for errors...
3083 */
3084
3085 server_error:
3086
3087 cupsdUnlinkOrRemoveFile(con->filename);
3088 cupsdClearString(&con->filename);
3089
3090 return (HTTP_STATUS_SERVER_ERROR);
3091 }
3092
3093
3094 /*
3095 * 'is_cgi()' - Is the resource a CGI script/program?
3096 */
3097
3098 static int /* O - 1 = CGI, 0 = file */
is_cgi(cupsd_client_t * con,const char * filename,struct stat * filestats,mime_type_t * type)3099 is_cgi(cupsd_client_t *con, /* I - Client connection */
3100 const char *filename, /* I - Real filename */
3101 struct stat *filestats, /* I - File information */
3102 mime_type_t *type) /* I - MIME type */
3103 {
3104 const char *options; /* Options on URL */
3105
3106
3107 /*
3108 * Get the options, if any...
3109 */
3110
3111 if ((options = strchr(con->uri, '?')) != NULL)
3112 {
3113 options ++;
3114 cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", options);
3115 }
3116
3117 /*
3118 * Check for known types...
3119 */
3120
3121 if (!type || _cups_strcasecmp(type->super, "application"))
3122 {
3123 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 0.", filename, filestats, type ? type->super : "unknown", type ? type->type : "unknown");
3124 return (0);
3125 }
3126
3127 if (!_cups_strcasecmp(type->type, "x-httpd-cgi") &&
3128 (filestats->st_mode & 0111))
3129 {
3130 /*
3131 * "application/x-httpd-cgi" is a CGI script.
3132 */
3133
3134 cupsdSetString(&con->command, filename);
3135
3136 if (options)
3137 cupsdSetStringf(&con->options, " %s", options);
3138
3139 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 1.", filename, filestats, type->super, type->type);
3140 return (1);
3141 }
3142
3143 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 0.", filename, filestats, type->super, type->type);
3144 return (0);
3145 }
3146
3147
3148 /*
3149 * 'is_path_absolute()' - Is a path absolute and free of relative elements (i.e. "..").
3150 */
3151
3152 static int /* O - 0 if relative, 1 if absolute */
is_path_absolute(const char * path)3153 is_path_absolute(const char *path) /* I - Input path */
3154 {
3155 /*
3156 * Check for a leading slash...
3157 */
3158
3159 if (path[0] != '/')
3160 return (0);
3161
3162 /*
3163 * Check for "<" or quotes in the path and reject since this is probably
3164 * someone trying to inject HTML...
3165 */
3166
3167 if (strchr(path, '<') != NULL || strchr(path, '\"') != NULL || strchr(path, '\'') != NULL)
3168 return (0);
3169
3170 /*
3171 * Check for "/.." in the path...
3172 */
3173
3174 while ((path = strstr(path, "/..")) != NULL)
3175 {
3176 if (!path[3] || path[3] == '/')
3177 return (0);
3178
3179 path ++;
3180 }
3181
3182 /*
3183 * If we haven't found any relative paths, return 1 indicating an
3184 * absolute path...
3185 */
3186
3187 return (1);
3188 }
3189
3190
3191 /*
3192 * 'pipe_command()' - Pipe the output of a command to the remote client.
3193 */
3194
3195 static int /* O - Process ID */
pipe_command(cupsd_client_t * con,int infile,int * outfile,char * command,char * options,int root)3196 pipe_command(cupsd_client_t *con, /* I - Client connection */
3197 int infile, /* I - Standard input for command */
3198 int *outfile, /* O - Standard output for command */
3199 char *command, /* I - Command to run */
3200 char *options, /* I - Options for command */
3201 int root) /* I - Run as root? */
3202 {
3203 int i; /* Looping var */
3204 int pid; /* Process ID */
3205 char *commptr, /* Command string pointer */
3206 commch; /* Command string character */
3207 char *uriptr; /* URI string pointer */
3208 int fds[2]; /* Pipe FDs */
3209 int argc; /* Number of arguments */
3210 int envc; /* Number of environment variables */
3211 char argbuf[10240], /* Argument buffer */
3212 *argv[100], /* Argument strings */
3213 *envp[MAX_ENV + 20]; /* Environment variables */
3214 char auth_type[256], /* AUTH_TYPE environment variable */
3215 content_length[1024], /* CONTENT_LENGTH environment variable */
3216 content_type[1024], /* CONTENT_TYPE environment variable */
3217 http_cookie[32768], /* HTTP_COOKIE environment variable */
3218 http_referer[1024], /* HTTP_REFERER environment variable */
3219 http_user_agent[1024], /* HTTP_USER_AGENT environment variable */
3220 lang[1024], /* LANG environment variable */
3221 path_info[1024], /* PATH_INFO environment variable */
3222 remote_addr[1024], /* REMOTE_ADDR environment variable */
3223 remote_host[1024], /* REMOTE_HOST environment variable */
3224 remote_user[1024], /* REMOTE_USER environment variable */
3225 script_filename[1024], /* SCRIPT_FILENAME environment variable */
3226 script_name[1024], /* SCRIPT_NAME environment variable */
3227 server_name[1024], /* SERVER_NAME environment variable */
3228 server_port[1024]; /* SERVER_PORT environment variable */
3229 ipp_attribute_t *attr; /* attributes-natural-language attribute */
3230
3231
3232 /*
3233 * Parse a copy of the options string, which is of the form:
3234 *
3235 * argument+argument+argument
3236 * ?argument+argument+argument
3237 * param=value¶m=value
3238 * ?param=value¶m=value
3239 * /name?argument+argument+argument
3240 * /name?param=value¶m=value
3241 *
3242 * If the string contains an "=" character after the initial name,
3243 * then we treat it as a HTTP GET form request and make a copy of
3244 * the remaining string for the environment variable.
3245 *
3246 * The string is always parsed out as command-line arguments, to
3247 * be consistent with Apache...
3248 */
3249
3250 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "pipe_command: infile=%d, outfile=%p, command=\"%s\", options=\"%s\", root=%d", infile, outfile, command, options ? options : "(null)", root);
3251
3252 argv[0] = command;
3253
3254 if (options)
3255 strlcpy(argbuf, options, sizeof(argbuf));
3256 else
3257 argbuf[0] = '\0';
3258
3259 if (argbuf[0] == '/')
3260 {
3261 /*
3262 * Found some trailing path information, set PATH_INFO...
3263 */
3264
3265 if ((commptr = strchr(argbuf, '?')) == NULL)
3266 commptr = argbuf + strlen(argbuf);
3267
3268 commch = *commptr;
3269 *commptr = '\0';
3270 snprintf(path_info, sizeof(path_info), "PATH_INFO=%s", argbuf);
3271 *commptr = commch;
3272 }
3273 else
3274 {
3275 commptr = argbuf;
3276 path_info[0] = '\0';
3277
3278 if (*commptr == ' ')
3279 commptr ++;
3280 }
3281
3282 if (*commptr == '?' && con->operation == HTTP_STATE_GET && !con->query_string)
3283 {
3284 commptr ++;
3285 cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", commptr);
3286 }
3287
3288 argc = 1;
3289
3290 if (*commptr)
3291 {
3292 argv[argc ++] = commptr;
3293
3294 for (; *commptr && argc < 99; commptr ++)
3295 {
3296 /*
3297 * Break arguments whenever we see a + or space...
3298 */
3299
3300 if (*commptr == ' ' || *commptr == '+')
3301 {
3302 while (*commptr == ' ' || *commptr == '+')
3303 *commptr++ = '\0';
3304
3305 /*
3306 * If we don't have a blank string, save it as another argument...
3307 */
3308
3309 if (*commptr)
3310 {
3311 argv[argc] = commptr;
3312 argc ++;
3313 }
3314 else
3315 break;
3316 }
3317 else if (*commptr == '%' && isxdigit(commptr[1] & 255) &&
3318 isxdigit(commptr[2] & 255))
3319 {
3320 /*
3321 * Convert the %xx notation to the individual character.
3322 */
3323
3324 if (commptr[1] >= '0' && commptr[1] <= '9')
3325 *commptr = (char)((commptr[1] - '0') << 4);
3326 else
3327 *commptr = (char)((tolower(commptr[1]) - 'a' + 10) << 4);
3328
3329 if (commptr[2] >= '0' && commptr[2] <= '9')
3330 *commptr |= commptr[2] - '0';
3331 else
3332 *commptr |= tolower(commptr[2]) - 'a' + 10;
3333
3334 _cups_strcpy(commptr + 1, commptr + 3);
3335
3336 /*
3337 * Check for a %00 and break if that is the case...
3338 */
3339
3340 if (!*commptr)
3341 break;
3342 }
3343 }
3344 }
3345
3346 argv[argc] = NULL;
3347
3348 /*
3349 * Setup the environment variables as needed...
3350 */
3351
3352 if (con->username[0])
3353 {
3354 snprintf(auth_type, sizeof(auth_type), "AUTH_TYPE=%s",
3355 httpGetField(con->http, HTTP_FIELD_AUTHORIZATION));
3356
3357 if ((uriptr = strchr(auth_type + 10, ' ')) != NULL)
3358 *uriptr = '\0';
3359 }
3360 else
3361 auth_type[0] = '\0';
3362
3363 if (con->request && (attr = ippFindAttribute(con->request, "attributes-natural-language", IPP_TAG_LANGUAGE)) != NULL)
3364 {
3365 cups_lang_t *language = cupsLangGet(ippGetString(attr, 0, NULL));
3366
3367 snprintf(lang, sizeof(lang), "LANG=%s.UTF8", language->language);
3368 cupsLangFree(language);
3369 }
3370 else if (con->language)
3371 snprintf(lang, sizeof(lang), "LANG=%s.UTF8", con->language->language);
3372 else
3373 strlcpy(lang, "LANG=C", sizeof(lang));
3374
3375 strlcpy(remote_addr, "REMOTE_ADDR=", sizeof(remote_addr));
3376 httpAddrString(httpGetAddress(con->http), remote_addr + 12,
3377 sizeof(remote_addr) - 12);
3378
3379 snprintf(remote_host, sizeof(remote_host), "REMOTE_HOST=%s",
3380 httpGetHostname(con->http, NULL, 0));
3381
3382 snprintf(script_name, sizeof(script_name), "SCRIPT_NAME=%s", con->uri);
3383 if ((uriptr = strchr(script_name, '?')) != NULL)
3384 *uriptr = '\0';
3385
3386 snprintf(script_filename, sizeof(script_filename), "SCRIPT_FILENAME=%s%s",
3387 DocumentRoot, script_name + 12);
3388
3389 snprintf(server_port, sizeof(server_port), "SERVER_PORT=%d", con->serverport);
3390
3391 if (httpGetField(con->http, HTTP_FIELD_HOST)[0])
3392 {
3393 char *nameptr; /* Pointer to ":port" */
3394
3395 snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
3396 httpGetField(con->http, HTTP_FIELD_HOST));
3397 if ((nameptr = strrchr(server_name, ':')) != NULL && !strchr(nameptr, ']'))
3398 *nameptr = '\0'; /* Strip trailing ":port" */
3399 }
3400 else
3401 snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
3402 con->servername);
3403
3404 envc = cupsdLoadEnv(envp, (int)(sizeof(envp) / sizeof(envp[0])));
3405
3406 if (auth_type[0])
3407 envp[envc ++] = auth_type;
3408
3409 envp[envc ++] = lang;
3410 envp[envc ++] = "REDIRECT_STATUS=1";
3411 envp[envc ++] = "GATEWAY_INTERFACE=CGI/1.1";
3412 envp[envc ++] = server_name;
3413 envp[envc ++] = server_port;
3414 envp[envc ++] = remote_addr;
3415 envp[envc ++] = remote_host;
3416 envp[envc ++] = script_name;
3417 envp[envc ++] = script_filename;
3418
3419 if (path_info[0])
3420 envp[envc ++] = path_info;
3421
3422 if (con->username[0])
3423 {
3424 snprintf(remote_user, sizeof(remote_user), "REMOTE_USER=%s", con->username);
3425
3426 envp[envc ++] = remote_user;
3427 }
3428
3429 if (httpGetVersion(con->http) == HTTP_VERSION_1_1)
3430 envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.1";
3431 else if (httpGetVersion(con->http) == HTTP_VERSION_1_0)
3432 envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.0";
3433 else
3434 envp[envc ++] = "SERVER_PROTOCOL=HTTP/0.9";
3435
3436 if (httpGetCookie(con->http))
3437 {
3438 snprintf(http_cookie, sizeof(http_cookie), "HTTP_COOKIE=%s",
3439 httpGetCookie(con->http));
3440 envp[envc ++] = http_cookie;
3441 }
3442
3443 if (httpGetField(con->http, HTTP_FIELD_USER_AGENT)[0])
3444 {
3445 snprintf(http_user_agent, sizeof(http_user_agent), "HTTP_USER_AGENT=%s",
3446 httpGetField(con->http, HTTP_FIELD_USER_AGENT));
3447 envp[envc ++] = http_user_agent;
3448 }
3449
3450 if (httpGetField(con->http, HTTP_FIELD_REFERER)[0])
3451 {
3452 snprintf(http_referer, sizeof(http_referer), "HTTP_REFERER=%s",
3453 httpGetField(con->http, HTTP_FIELD_REFERER));
3454 envp[envc ++] = http_referer;
3455 }
3456
3457 if (con->operation == HTTP_STATE_GET)
3458 {
3459 envp[envc ++] = "REQUEST_METHOD=GET";
3460
3461 if (con->query_string)
3462 {
3463 /*
3464 * Add GET form variables after ?...
3465 */
3466
3467 envp[envc ++] = con->query_string;
3468 }
3469 else
3470 envp[envc ++] = "QUERY_STRING=";
3471 }
3472 else
3473 {
3474 sprintf(content_length, "CONTENT_LENGTH=" CUPS_LLFMT,
3475 CUPS_LLCAST con->bytes);
3476 snprintf(content_type, sizeof(content_type), "CONTENT_TYPE=%s",
3477 httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE));
3478
3479 envp[envc ++] = "REQUEST_METHOD=POST";
3480 envp[envc ++] = content_length;
3481 envp[envc ++] = content_type;
3482 }
3483
3484 /*
3485 * Tell the CGI if we are using encryption...
3486 */
3487
3488 if (httpIsEncrypted(con->http))
3489 envp[envc ++] = "HTTPS=ON";
3490
3491 /*
3492 * Terminate the environment array...
3493 */
3494
3495 envp[envc] = NULL;
3496
3497 if (LogLevel >= CUPSD_LOG_DEBUG)
3498 {
3499 for (i = 0; i < argc; i ++)
3500 cupsdLogMessage(CUPSD_LOG_DEBUG,
3501 "[CGI] argv[%d] = \"%s\"", i, argv[i]);
3502 for (i = 0; i < envc; i ++)
3503 cupsdLogMessage(CUPSD_LOG_DEBUG,
3504 "[CGI] envp[%d] = \"%s\"", i, envp[i]);
3505 }
3506
3507 /*
3508 * Create a pipe for the output...
3509 */
3510
3511 if (cupsdOpenPipe(fds))
3512 {
3513 cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to create pipe for %s - %s",
3514 argv[0], strerror(errno));
3515 return (0);
3516 }
3517
3518 /*
3519 * Then execute the command...
3520 */
3521
3522 if (cupsdStartProcess(command, argv, envp, infile, fds[1], CGIPipes[1],
3523 -1, -1, root, DefaultProfile, NULL, &pid) < 0)
3524 {
3525 /*
3526 * Error - can't fork!
3527 */
3528
3529 cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to start %s - %s", argv[0],
3530 strerror(errno));
3531
3532 cupsdClosePipe(fds);
3533 pid = 0;
3534 }
3535 else
3536 {
3537 /*
3538 * Fork successful - return the PID...
3539 */
3540
3541 if (con->username[0])
3542 cupsdAddCert(pid, con->username, con->type);
3543
3544 cupsdLogMessage(CUPSD_LOG_DEBUG, "[CGI] Started %s (PID %d)", command, pid);
3545
3546 *outfile = fds[0];
3547 close(fds[1]);
3548 }
3549
3550 return (pid);
3551 }
3552
3553
3554 /*
3555 * 'valid_host()' - Is the Host: field valid?
3556 */
3557
3558 static int /* O - 1 if valid, 0 if not */
valid_host(cupsd_client_t * con)3559 valid_host(cupsd_client_t *con) /* I - Client connection */
3560 {
3561 cupsd_alias_t *a; /* Current alias */
3562 cupsd_netif_t *netif; /* Current network interface */
3563 const char *end; /* End character */
3564 char *ptr; /* Pointer into host value */
3565
3566
3567 /*
3568 * Copy the Host: header for later use...
3569 */
3570
3571 strlcpy(con->clientname, httpGetField(con->http, HTTP_FIELD_HOST),
3572 sizeof(con->clientname));
3573 if ((ptr = strrchr(con->clientname, ':')) != NULL && !strchr(ptr, ']'))
3574 {
3575 *ptr++ = '\0';
3576 con->clientport = atoi(ptr);
3577 }
3578 else
3579 con->clientport = con->serverport;
3580
3581 /*
3582 * Then validate...
3583 */
3584
3585 if (httpAddrLocalhost(httpGetAddress(con->http)))
3586 {
3587 /*
3588 * Only allow "localhost" or the equivalent IPv4 or IPv6 numerical
3589 * addresses when accessing CUPS via the loopback interface...
3590 */
3591
3592 return (!_cups_strcasecmp(con->clientname, "localhost") ||
3593 !_cups_strcasecmp(con->clientname, "localhost.") ||
3594 !strcmp(con->clientname, "127.0.0.1") ||
3595 !strcmp(con->clientname, "[::1]"));
3596 }
3597
3598 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
3599 /*
3600 * Check if the hostname is something.local (Bonjour); if so, allow it.
3601 */
3602
3603 if ((end = strrchr(con->clientname, '.')) != NULL && end > con->clientname &&
3604 !end[1])
3605 {
3606 /*
3607 * "." on end, work back to second-to-last "."...
3608 */
3609
3610 for (end --; end > con->clientname && *end != '.'; end --);
3611 }
3612
3613 if (end && (!_cups_strcasecmp(end, ".local") ||
3614 !_cups_strcasecmp(end, ".local.")))
3615 return (1);
3616 #endif /* HAVE_DNSSD || HAVE_AVAHI */
3617
3618 /*
3619 * Check if the hostname is an IP address...
3620 */
3621
3622 if (isdigit(con->clientname[0] & 255) || con->clientname[0] == '[')
3623 {
3624 /*
3625 * Possible IPv4/IPv6 address...
3626 */
3627
3628 http_addrlist_t *addrlist; /* List of addresses */
3629
3630
3631 if ((addrlist = httpAddrGetList(con->clientname, AF_UNSPEC, NULL)) != NULL)
3632 {
3633 /*
3634 * Good IPv4/IPv6 address...
3635 */
3636
3637 httpAddrFreeList(addrlist);
3638 return (1);
3639 }
3640 }
3641
3642 /*
3643 * Check for (alias) name matches...
3644 */
3645
3646 for (a = (cupsd_alias_t *)cupsArrayFirst(ServerAlias);
3647 a;
3648 a = (cupsd_alias_t *)cupsArrayNext(ServerAlias))
3649 {
3650 /*
3651 * "ServerAlias *" allows all host values through...
3652 */
3653
3654 if (!strcmp(a->name, "*"))
3655 return (1);
3656
3657 if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
3658 {
3659 /*
3660 * Prefix matches; check the character at the end - it must be "." or nul.
3661 */
3662
3663 end = con->clientname + a->namelen;
3664
3665 if (!*end || (*end == '.' && !end[1]))
3666 return (1);
3667 }
3668 }
3669
3670 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
3671 for (a = (cupsd_alias_t *)cupsArrayFirst(DNSSDAlias);
3672 a;
3673 a = (cupsd_alias_t *)cupsArrayNext(DNSSDAlias))
3674 {
3675 /*
3676 * "ServerAlias *" allows all host values through...
3677 */
3678
3679 if (!strcmp(a->name, "*"))
3680 return (1);
3681
3682 if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
3683 {
3684 /*
3685 * Prefix matches; check the character at the end - it must be "." or nul.
3686 */
3687
3688 end = con->clientname + a->namelen;
3689
3690 if (!*end || (*end == '.' && !end[1]))
3691 return (1);
3692 }
3693 }
3694 #endif /* HAVE_DNSSD || HAVE_AVAHI */
3695
3696 /*
3697 * Check for interface hostname matches...
3698 */
3699
3700 for (netif = (cupsd_netif_t *)cupsArrayFirst(NetIFList);
3701 netif;
3702 netif = (cupsd_netif_t *)cupsArrayNext(NetIFList))
3703 {
3704 if (!_cups_strncasecmp(con->clientname, netif->hostname, netif->hostlen))
3705 {
3706 /*
3707 * Prefix matches; check the character at the end - it must be "." or nul.
3708 */
3709
3710 end = con->clientname + netif->hostlen;
3711
3712 if (!*end || (*end == '.' && !end[1]))
3713 return (1);
3714 }
3715 }
3716
3717 return (0);
3718 }
3719
3720
3721 /*
3722 * 'write_file()' - Send a file via HTTP.
3723 */
3724
3725 static int /* O - 0 on failure, 1 on success */
write_file(cupsd_client_t * con,http_status_t code,char * filename,char * type,struct stat * filestats)3726 write_file(cupsd_client_t *con, /* I - Client connection */
3727 http_status_t code, /* I - HTTP status */
3728 char *filename, /* I - Filename */
3729 char *type, /* I - File type */
3730 struct stat *filestats) /* O - File information */
3731 {
3732 con->file = open(filename, O_RDONLY);
3733
3734 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_file: code=%d, filename=\"%s\" (%d), type=\"%s\", filestats=%p.", code, filename, con->file, type ? type : "(null)", filestats);
3735
3736 if (con->file < 0)
3737 return (0);
3738
3739 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
3740
3741 con->pipe_pid = 0;
3742 con->sent_header = 1;
3743
3744 httpClearFields(con->http);
3745
3746 httpSetLength(con->http, (size_t)filestats->st_size);
3747
3748 httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED,
3749 httpGetDateString(filestats->st_mtime));
3750
3751 if (!cupsdSendHeader(con, code, type, CUPSD_AUTH_NONE))
3752 return (0);
3753
3754 cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
3755
3756 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending file.");
3757
3758 return (1);
3759 }
3760
3761
3762 /*
3763 * 'write_pipe()' - Flag that data is available on the CGI pipe.
3764 */
3765
3766 static void
write_pipe(cupsd_client_t * con)3767 write_pipe(cupsd_client_t *con) /* I - Client connection */
3768 {
3769 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_pipe: CGI output on fd %d.", con->file);
3770
3771 con->file_ready = 1;
3772
3773 cupsdRemoveSelect(con->file);
3774 cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
3775
3776 cupsdLogClient(con, CUPSD_LOG_DEBUG, "CGI data ready to be sent.");
3777 }
3778
