1 /*
2 * Client routines for the CUPS scheduler.
3 *
4 * Copyright © 2020-2024 by OpenPrinting.
5 * Copyright © 2007-2021 by Apple Inc.
6 * Copyright © 1997-2007 by Easy Software Products, all rights reserved.
7 *
8 * This file contains Kerberos support code, copyright 2006 by
9 * Jelmer Vernooij.
10 *
11 * Licensed under Apache License v2.0. See the file "LICENSE" for more
12 * information.
13 */
14
15 /*
16 * Include necessary headers...
17 */
18
19 #define _CUPS_NO_DEPRECATED
20 #define _HTTP_NO_PRIVATE
21 #include "cupsd.h"
22
23 #ifdef __APPLE__
24 # include <libproc.h>
25 #endif /* __APPLE__ */
26 #ifdef HAVE_TCPD_H
27 # include <tcpd.h>
28 #endif /* HAVE_TCPD_H */
29
30
31 /*
32 * Local functions...
33 */
34
35 static int check_if_modified(cupsd_client_t *con,
36 struct stat *filestats);
37 static int compare_clients(cupsd_client_t *a, cupsd_client_t *b,
38 void *data);
39 #ifdef HAVE_TLS
40 static int cupsd_start_tls(cupsd_client_t *con, http_encryption_t e);
41 #endif /* HAVE_TLS */
42 static char *get_file(cupsd_client_t *con, struct stat *filestats,
43 char *filename, size_t len);
44 static http_status_t install_cupsd_conf(cupsd_client_t *con);
45 static int is_cgi(cupsd_client_t *con, const char *filename,
46 struct stat *filestats, mime_type_t *type);
47 static int is_path_absolute(const char *path);
48 static int pipe_command(cupsd_client_t *con, int infile, int *outfile,
49 char *command, char *options, int root);
50 static int valid_host(cupsd_client_t *con);
51 static int write_file(cupsd_client_t *con, http_status_t code,
52 char *filename, char *type,
53 struct stat *filestats);
54 static void write_pipe(cupsd_client_t *con);
55
56
57 /*
58 * 'cupsdAcceptClient()' - Accept a new client.
59 */
60
61 void
cupsdAcceptClient(cupsd_listener_t * lis)62 cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
63 {
64 const char *hostname; /* Hostname of client */
65 char name[256]; /* Hostname of client */
66 int count; /* Count of connections on a host */
67 cupsd_client_t *con, /* New client pointer */
68 *tempcon; /* Temporary client pointer */
69 socklen_t addrlen; /* Length of address */
70 http_addr_t temp; /* Temporary address variable */
71 static time_t last_dos = 0; /* Time of last DoS attack */
72 #ifdef HAVE_TCPD_H
73 struct request_info wrap_req; /* TCP wrappers request information */
74 #endif /* HAVE_TCPD_H */
75
76
77 cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAcceptClient(lis=%p(%d)) Clients=%d", lis, lis->fd, cupsArrayCount(Clients));
78
79 /*
80 * Make sure we don't have a full set of clients already...
81 */
82
83 if (MaxClients > 0 && cupsArrayCount(Clients) >= MaxClients)
84 return;
85
86 cupsdSetBusyState(1);
87
88 /*
89 * Get a pointer to the next available client...
90 */
91
92 if (!Clients)
93 Clients = cupsArrayNew(NULL, NULL);
94
95 if (!Clients)
96 {
97 cupsdLogMessage(CUPSD_LOG_ERROR,
98 "Unable to allocate memory for clients array!");
99 cupsdPauseListening();
100 return;
101 }
102
103 if (!ActiveClients)
104 ActiveClients = cupsArrayNew((cups_array_func_t)compare_clients, NULL);
105
106 if (!ActiveClients)
107 {
108 cupsdLogMessage(CUPSD_LOG_ERROR,
109 "Unable to allocate memory for active clients array!");
110 cupsdPauseListening();
111 return;
112 }
113
114 if ((con = calloc(1, sizeof(cupsd_client_t))) == NULL)
115 {
116 cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for client!");
117 cupsdPauseListening();
118 return;
119 }
120
121 /*
122 * Accept the client and get the remote address...
123 */
124
125 con->number = ++ LastClientNumber;
126 con->file = -1;
127
128 if ((con->http = httpAcceptConnection(lis->fd, 0)) == NULL)
129 {
130 if (errno == ENFILE || errno == EMFILE)
131 cupsdPauseListening();
132
133 cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to accept client connection - %s.",
134 strerror(errno));
135 free(con);
136
137 return;
138 }
139
140 /*
141 * Save the connected address and port number...
142 */
143
144 addrlen = sizeof(con->clientaddr);
145
146 if (getsockname(httpGetFd(con->http), (struct sockaddr *)&con->clientaddr, &addrlen) || addrlen == 0)
147 con->clientaddr = lis->address;
148
149 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Server address is \"%s\".", httpAddrString(&con->clientaddr, name, sizeof(name)));
150
151 /*
152 * Check the number of clients on the same address...
153 */
154
155 for (count = 0, tempcon = (cupsd_client_t *)cupsArrayFirst(Clients);
156 tempcon;
157 tempcon = (cupsd_client_t *)cupsArrayNext(Clients))
158 if (httpAddrEqual(httpGetAddress(tempcon->http), httpGetAddress(con->http)))
159 {
160 count ++;
161 if (count >= MaxClientsPerHost)
162 break;
163 }
164
165 if (count >= MaxClientsPerHost)
166 {
167 if ((time(NULL) - last_dos) >= 60)
168 {
169 last_dos = time(NULL);
170 cupsdLogMessage(CUPSD_LOG_WARN,
171 "Possible DoS attack - more than %d clients connecting "
172 "from %s.",
173 MaxClientsPerHost,
174 httpGetHostname(con->http, name, sizeof(name)));
175 }
176
177 httpClose(con->http);
178 free(con);
179 return;
180 }
181
182 /*
183 * Get the hostname or format the IP address as needed...
184 */
185
186 if (HostNameLookups)
187 hostname = httpResolveHostname(con->http, NULL, 0);
188 else
189 hostname = httpGetHostname(con->http, NULL, 0);
190
191 if (hostname == NULL && HostNameLookups == 2)
192 {
193 /*
194 * Can't have an unresolved IP address with double-lookups enabled...
195 */
196 cupsdLogClient(con, CUPSD_LOG_WARN,
197 "Name lookup failed - closing connection from %s!",
198 httpGetHostname(con->http, NULL, 0));
199
200 httpClose(con->http);
201 free(con);
202 return;
203 }
204
205 if (HostNameLookups == 2)
206 {
207 /*
208 * Do double lookups as needed...
209 */
210
211 http_addrlist_t *addrlist, /* List of addresses */
212 *addr; /* Current address */
213
214 if ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, NULL)) != NULL)
215 {
216 /*
217 * See if the hostname maps to the same IP address...
218 */
219
220 for (addr = addrlist; addr; addr = addr->next)
221 if (httpAddrEqual(httpGetAddress(con->http), &(addr->addr)))
222 break;
223 }
224 else
225 addr = NULL;
226
227 httpAddrFreeList(addrlist);
228
229 if (!addr)
230 {
231 /*
232 * Can't have a hostname that doesn't resolve to the same IP address
233 * with double-lookups enabled...
234 */
235
236 cupsdLogClient(con, CUPSD_LOG_WARN,
237 "IP lookup failed - closing connection from %s!",
238 httpGetHostname(con->http, NULL, 0));
239
240 httpClose(con->http);
241 free(con);
242 return;
243 }
244 }
245
246 #ifdef HAVE_TCPD_H
247 /*
248 * See if the connection is denied by TCP wrappers...
249 */
250
251 request_init(&wrap_req, RQ_DAEMON, "cupsd", RQ_FILE, httpGetFd(con->http),
252 NULL);
253 fromhost(&wrap_req);
254
255 if (!hosts_access(&wrap_req))
256 {
257 cupsdLogClient(con, CUPSD_LOG_WARN,
258 "Connection from %s refused by /etc/hosts.allow and "
259 "/etc/hosts.deny rules.", httpGetHostname(con->http, NULL, 0));
260
261 httpClose(con->http);
262 free(con);
263 return;
264 }
265 #endif /* HAVE_TCPD_H */
266
267 #ifdef AF_LOCAL
268 if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
269 {
270 # ifdef __APPLE__
271 socklen_t peersize; /* Size of peer credentials */
272 pid_t peerpid; /* Peer process ID */
273 char peername[256]; /* Name of process */
274
275 peersize = sizeof(peerpid);
276 if (!getsockopt(httpGetFd(con->http), SOL_LOCAL, LOCAL_PEERPID, &peerpid,
277 &peersize))
278 {
279 if (!proc_name((int)peerpid, peername, sizeof(peername)))
280 cupsdLogClient(con, CUPSD_LOG_DEBUG,
281 "Accepted from %s (Domain ???[%d])",
282 httpGetHostname(con->http, NULL, 0), (int)peerpid);
283 else
284 cupsdLogClient(con, CUPSD_LOG_DEBUG,
285 "Accepted from %s (Domain %s[%d])",
286 httpGetHostname(con->http, NULL, 0), peername, (int)peerpid);
287 }
288 else
289 # endif /* __APPLE__ */
290
291 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s (Domain)",
292 httpGetHostname(con->http, NULL, 0));
293 }
294 else
295 #endif /* AF_LOCAL */
296 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s:%d (IPv%d)",
297 httpGetHostname(con->http, NULL, 0),
298 httpAddrPort(httpGetAddress(con->http)),
299 httpAddrFamily(httpGetAddress(con->http)) == AF_INET ? 4 : 6);
300
301 /*
302 * Get the local address the client connected to...
303 */
304
305 addrlen = sizeof(temp);
306 if (getsockname(httpGetFd(con->http), (struct sockaddr *)&temp, &addrlen))
307 {
308 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get local address - %s",
309 strerror(errno));
310
311 strlcpy(con->servername, "localhost", sizeof(con->servername));
312 con->serverport = LocalPort;
313 }
314 #ifdef AF_LOCAL
315 else if (httpAddrFamily(&temp) == AF_LOCAL)
316 {
317 strlcpy(con->servername, "localhost", sizeof(con->servername));
318 con->serverport = LocalPort;
319 }
320 #endif /* AF_LOCAL */
321 else
322 {
323 if (httpAddrLocalhost(&temp))
324 strlcpy(con->servername, "localhost", sizeof(con->servername));
325 else if (HostNameLookups)
326 httpAddrLookup(&temp, con->servername, sizeof(con->servername));
327 else
328 httpAddrString(&temp, con->servername, sizeof(con->servername));
329
330 con->serverport = httpAddrPort(&(lis->address));
331 }
332
333 /*
334 * Apply ServerHeader if any
335 */
336
337 if (ServerHeader)
338 httpSetDefaultField(con->http, HTTP_FIELD_SERVER, ServerHeader);
339
340 /*
341 * Add the connection to the array of active clients...
342 */
343
344 cupsArrayAdd(Clients, con);
345
346 /*
347 * Add the socket to the server select.
348 */
349
350 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL,
351 con);
352
353 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
354
355 /*
356 * Temporarily suspend accept()'s until we lose a client...
357 */
358
359 if (cupsArrayCount(Clients) == MaxClients)
360 cupsdPauseListening();
361
362 #ifdef HAVE_TLS
363 /*
364 * See if we are connecting on a secure port...
365 */
366
367 if (lis->encryption == HTTP_ENCRYPTION_ALWAYS)
368 {
369 /*
370 * https connection; go secure...
371 */
372
373 if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
374 cupsdCloseClient(con);
375 }
376 else
377 con->auto_ssl = 1;
378 #endif /* HAVE_TLS */
379 }
380
381
382 /*
383 * 'cupsdCloseAllClients()' - Close all remote clients immediately.
384 */
385
386 void
cupsdCloseAllClients(void)387 cupsdCloseAllClients(void)
388 {
389 cupsd_client_t *con; /* Current client */
390
391
392 cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCloseAllClients() Clients=%d", cupsArrayCount(Clients));
393
394 for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
395 con;
396 con = (cupsd_client_t *)cupsArrayNext(Clients))
397 if (cupsdCloseClient(con))
398 cupsdCloseClient(con);
399 }
400
401
402 /*
403 * 'cupsdCloseClient()' - Close a remote client.
404 */
405
406 int /* O - 1 if partial close, 0 if fully closed */
cupsdCloseClient(cupsd_client_t * con)407 cupsdCloseClient(cupsd_client_t *con) /* I - Client to close */
408 {
409 int partial; /* Do partial close for SSL? */
410
411
412 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing connection.");
413
414 /*
415 * Flush pending writes before closing...
416 */
417
418 httpFlushWrite(con->http);
419
420 partial = 0;
421
422 if (con->pipe_pid != 0)
423 {
424 /*
425 * Stop any CGI process...
426 */
427
428 cupsdEndProcess(con->pipe_pid, 1);
429 con->pipe_pid = 0;
430 }
431
432 if (con->file >= 0)
433 {
434 cupsdRemoveSelect(con->file);
435
436 close(con->file);
437 con->file = -1;
438 }
439
440 if (con->bg_pending)
441 {
442 /*
443 * Don't close connection when there is a background thread pending
444 */
445 partial = 1;
446 }
447
448 /*
449 * Close the socket and clear the file from the input set for select()...
450 */
451
452 if (httpGetFd(con->http) >= 0)
453 {
454 cupsArrayRemove(ActiveClients, con);
455 cupsdSetBusyState(0);
456
457 #ifdef HAVE_TLS
458 /*
459 * Shutdown encryption as needed...
460 */
461
462 if (httpIsEncrypted(con->http))
463 partial = 1;
464 #endif /* HAVE_TLS */
465
466 if (partial)
467 {
468 /*
469 * Only do a partial close so that the encrypted client gets everything.
470 */
471
472 httpShutdown(con->http);
473 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient,
474 NULL, con);
475
476 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for socket close.");
477 }
478 else
479 {
480 /*
481 * Shut the socket down fully...
482 */
483
484 cupsdRemoveSelect(httpGetFd(con->http));
485 httpClose(con->http);
486 con->http = NULL;
487 }
488 }
489
490 if (!partial)
491 {
492 /*
493 * Free memory...
494 */
495
496 cupsdRemoveSelect(httpGetFd(con->http));
497
498 httpClose(con->http);
499
500 if (con->filename)
501 {
502 unlink(con->filename);
503 cupsdClearString(&con->filename);
504 }
505
506 cupsdClearString(&con->command);
507 cupsdClearString(&con->options);
508 cupsdClearString(&con->query_string);
509
510 if (con->request)
511 {
512 ippDelete(con->request);
513 con->request = NULL;
514 }
515
516 if (con->response)
517 {
518 ippDelete(con->response);
519 con->response = NULL;
520 }
521
522 if (con->language)
523 {
524 cupsLangFree(con->language);
525 con->language = NULL;
526 }
527
528 #ifdef HAVE_AUTHORIZATION_H
529 if (con->authref)
530 {
531 AuthorizationFree(con->authref, kAuthorizationFlagDefaults);
532 con->authref = NULL;
533 }
534 #endif /* HAVE_AUTHORIZATION_H */
535
536 /*
537 * Re-enable new client connections if we are going back under the
538 * limit...
539 */
540
541 if (cupsArrayCount(Clients) == MaxClients)
542 cupsdResumeListening();
543
544 /*
545 * Compact the list of clients as necessary...
546 */
547
548 cupsArrayRemove(Clients, con);
549
550 free(con);
551 }
552
553 return (partial);
554 }
555
556
557 /*
558 * 'cupsdReadClient()' - Read data from a client.
559 */
560
561 void
cupsdReadClient(cupsd_client_t * con)562 cupsdReadClient(cupsd_client_t *con) /* I - Client to read from */
563 {
564 char line[32768], /* Line from client... */
565 locale[64], /* Locale */
566 name[128], /* Class/Printer name */
567 *ptr; /* Pointer into strings */
568 http_status_t status; /* Transfer status */
569 ipp_state_t ipp_state; /* State of IPP transfer */
570 int bytes; /* Number of bytes to POST */
571 char *filename; /* Name of file for GET/HEAD */
572 char buf[1024]; /* Buffer for real filename */
573 struct stat filestats; /* File information */
574 mime_type_t *type; /* MIME type of file */
575 static unsigned request_id = 0; /* Request ID for temp files */
576
577
578 status = HTTP_STATUS_CONTINUE;
579
580 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);
581
582 if (httpError(con->http) == EPIPE && !httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
583 {
584 /*
585 * Connection closed...
586 */
587
588 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
589 cupsdCloseClient(con);
590 return;
591 }
592
593 if (httpGetState(con->http) == HTTP_STATE_GET_SEND ||
594 httpGetState(con->http) == HTTP_STATE_POST_SEND ||
595 httpGetState(con->http) == HTTP_STATE_STATUS)
596 {
597 /*
598 * If we get called in the wrong state, then something went wrong with the
599 * connection and we need to shut it down...
600 */
601
602 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP read state %s.", httpStateString(httpGetState(con->http)));
603 cupsdCloseClient(con);
604 return;
605 }
606
607 #ifdef HAVE_TLS
608 if (con->auto_ssl)
609 {
610 /*
611 * Automatically check for a SSL/TLS handshake...
612 */
613
614 con->auto_ssl = 0;
615
616 if (recv(httpGetFd(con->http), buf, 1, MSG_PEEK) == 1 &&
617 (!buf[0] || !strchr("DGHOPT", buf[0])))
618 {
619 /*
620 * Encrypt this connection...
621 */
622
623 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "Saw first byte %02X, auto-negotiating SSL/TLS session.", buf[0] & 255);
624
625 if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
626 cupsdCloseClient(con);
627
628 return;
629 }
630 }
631 #endif /* HAVE_TLS */
632
633 switch (httpGetState(con->http))
634 {
635 case HTTP_STATE_WAITING :
636 /*
637 * See if we've received a request line...
638 */
639
640 con->operation = httpReadRequest(con->http, con->uri, sizeof(con->uri));
641 if (con->operation == HTTP_STATE_ERROR ||
642 con->operation == HTTP_STATE_UNKNOWN_METHOD ||
643 con->operation == HTTP_STATE_UNKNOWN_VERSION)
644 {
645 if (httpError(con->http))
646 cupsdLogClient(con, CUPSD_LOG_DEBUG,
647 "HTTP_STATE_WAITING Closing for error %d (%s)",
648 httpError(con->http), strerror(httpError(con->http)));
649 else
650 cupsdLogClient(con, CUPSD_LOG_DEBUG,
651 "HTTP_STATE_WAITING Closing on error: %s",
652 cupsLastErrorString());
653
654 cupsdCloseClient(con);
655 return;
656 }
657
658 /*
659 * Ignore blank request lines...
660 */
661
662 if (con->operation == HTTP_STATE_WAITING)
663 break;
664
665 /*
666 * Clear other state variables...
667 */
668
669 con->bytes = 0;
670 con->file = -1;
671 con->file_ready = 0;
672 con->pipe_pid = 0;
673 con->username[0] = '\0';
674 con->password[0] = '\0';
675
676 cupsdClearString(&con->command);
677 cupsdClearString(&con->options);
678 cupsdClearString(&con->query_string);
679
680 if (con->request)
681 {
682 ippDelete(con->request);
683 con->request = NULL;
684 }
685
686 if (con->response)
687 {
688 ippDelete(con->response);
689 con->response = NULL;
690 }
691
692 if (con->language)
693 {
694 cupsLangFree(con->language);
695 con->language = NULL;
696 }
697
698 #ifdef HAVE_GSSAPI
699 con->have_gss = 0;
700 con->gss_uid = 0;
701 #endif /* HAVE_GSSAPI */
702
703 /*
704 * Handle full URLs in the request line...
705 */
706
707 if (strcmp(con->uri, "*"))
708 {
709 char scheme[HTTP_MAX_URI], /* Method/scheme */
710 userpass[HTTP_MAX_URI], /* Username:password */
711 hostname[HTTP_MAX_URI], /* Hostname */
712 resource[HTTP_MAX_URI]; /* Resource path */
713 int port; /* Port number */
714
715 /*
716 * Separate the URI into its components...
717 */
718
719 if (httpSeparateURI(HTTP_URI_CODING_MOST, con->uri,
720 scheme, sizeof(scheme),
721 userpass, sizeof(userpass),
722 hostname, sizeof(hostname), &port,
723 resource, sizeof(resource)) < HTTP_URI_STATUS_OK)
724 {
725 cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
726 con->uri);
727 cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
728 cupsdCloseClient(con);
729 return;
730 }
731
732 /*
733 * Only allow URIs with the servername, localhost, or an IP
734 * address...
735 */
736
737 if (strcmp(scheme, "file") &&
738 _cups_strcasecmp(hostname, ServerName) &&
739 _cups_strcasecmp(hostname, "localhost") &&
740 !cupsArrayFind(ServerAlias, hostname) &&
741 !isdigit(hostname[0]) && hostname[0] != '[')
742 {
743 /*
744 * Nope, we don't do proxies...
745 */
746
747 cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
748 con->uri);
749 cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
750 cupsdCloseClient(con);
751 return;
752 }
753
754 /*
755 * Copy the resource portion back into the URI; both resource and
756 * con->uri are HTTP_MAX_URI bytes in size...
757 */
758
759 strlcpy(con->uri, resource, sizeof(con->uri));
760 }
761
762 /*
763 * Process the request...
764 */
765
766 gettimeofday(&(con->start), NULL);
767
768 cupsdLogClient(con, CUPSD_LOG_DEBUG, "%s %s HTTP/%d.%d",
769 httpStateString(con->operation) + 11, con->uri,
770 httpGetVersion(con->http) / 100,
771 httpGetVersion(con->http) % 100);
772
773 if (!cupsArrayFind(ActiveClients, con))
774 {
775 cupsArrayAdd(ActiveClients, con);
776 cupsdSetBusyState(0);
777 }
778
779 case HTTP_STATE_OPTIONS :
780 case HTTP_STATE_DELETE :
781 case HTTP_STATE_GET :
782 case HTTP_STATE_HEAD :
783 case HTTP_STATE_POST :
784 case HTTP_STATE_PUT :
785 case HTTP_STATE_TRACE :
786 /*
787 * Parse incoming parameters until the status changes...
788 */
789
790 while ((status = httpUpdate(con->http)) == HTTP_STATUS_CONTINUE)
791 if (!httpGetReady(con->http))
792 break;
793
794 if (status != HTTP_STATUS_OK && status != HTTP_STATUS_CONTINUE)
795 {
796 if (httpError(con->http) && httpError(con->http) != EPIPE)
797 cupsdLogClient(con, CUPSD_LOG_DEBUG,
798 "Closing for error %d (%s) while reading headers.",
799 httpError(con->http), strerror(httpError(con->http)));
800 else
801 cupsdLogClient(con, CUPSD_LOG_DEBUG,
802 "Closing on EOF while reading headers.");
803
804 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
805 cupsdCloseClient(con);
806 return;
807 }
808 break;
809
810 default :
811 if (!httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
812 {
813 /*
814 * Connection closed...
815 */
816
817 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
818 cupsdCloseClient(con);
819 return;
820 }
821 break; /* Anti-compiler-warning-code */
822 }
823
824 /*
825 * Handle new transfers...
826 */
827
828 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Read: status=%d, state=%d", status, httpGetState(con->http));
829
830 if (status == HTTP_STATUS_OK)
831 {
832 /*
833 * Record whether the client is a web browser. "Mozilla" was the original
834 * and it seems that every web browser in existence now uses that as the
835 * prefix with additional information identifying *which* browser.
836 *
837 * Chrome (at least) has problems with multiple WWW-Authenticate values in
838 * a single header, so we only report Basic or Negotiate to web browsers and
839 * leave the multiple choices to the native CUPS client...
840 */
841
842 con->is_browser = !strncmp(httpGetField(con->http, HTTP_FIELD_USER_AGENT), "Mozilla/", 8);
843
844 if (httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE)[0])
845 {
846 /*
847 * Figure out the locale from the Accept-Language and Content-Type
848 * fields...
849 */
850
851 if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
852 ',')) != NULL)
853 *ptr = '\0';
854
855 if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
856 ';')) != NULL)
857 *ptr = '\0';
858
859 if ((ptr = strstr(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE),
860 "charset=")) != NULL)
861 {
862 /*
863 * Combine language and charset, and trim any extra params in the
864 * content-type.
865 */
866
867 snprintf(locale, sizeof(locale), "%s.%s",
868 httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE), ptr + 8);
869
870 if ((ptr = strchr(locale, ',')) != NULL)
871 *ptr = '\0';
872 }
873 else
874 snprintf(locale, sizeof(locale), "%s.UTF-8",
875 httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE));
876
877 con->language = cupsLangGet(locale);
878 }
879 else
880 con->language = cupsLangGet(DefaultLocale);
881
882 cupsdAuthorize(con);
883
884 if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
885 "Keep-Alive", 10) && KeepAlive)
886 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_ON);
887 else if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
888 "close", 5))
889 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
890
891 if (!httpGetField(con->http, HTTP_FIELD_HOST)[0] &&
892 httpGetVersion(con->http) >= HTTP_VERSION_1_1)
893 {
894 /*
895 * HTTP/1.1 and higher require the "Host:" field...
896 */
897
898 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
899 {
900 cupsdLogClient(con, CUPSD_LOG_ERROR, "Missing Host: field in request.");
901 cupsdCloseClient(con);
902 return;
903 }
904 }
905 else if (!valid_host(con))
906 {
907 /*
908 * Access to localhost must use "localhost" or the corresponding IPv4
909 * or IPv6 values in the Host: field.
910 */
911
912 cupsdLogClient(con, CUPSD_LOG_ERROR,
913 "Request from \"%s\" using invalid Host: field \"%s\".",
914 httpGetHostname(con->http, NULL, 0), httpGetField(con->http, HTTP_FIELD_HOST));
915
916 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
917 {
918 cupsdCloseClient(con);
919 return;
920 }
921 }
922 else if (con->operation == HTTP_STATE_OPTIONS)
923 {
924 /*
925 * Do OPTIONS command...
926 */
927
928 if (con->best && con->best->type != CUPSD_AUTH_NONE)
929 {
930 httpClearFields(con->http);
931
932 if (!cupsdSendHeader(con, HTTP_STATUS_UNAUTHORIZED, NULL, CUPSD_AUTH_NONE))
933 {
934 cupsdCloseClient(con);
935 return;
936 }
937 }
938
939 if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION), "Upgrade") && strstr(httpGetField(con->http, HTTP_FIELD_UPGRADE), "TLS/") != NULL && !httpIsEncrypted(con->http))
940 {
941 #ifdef HAVE_TLS
942 /*
943 * Do encryption stuff...
944 */
945
946 httpClearFields(con->http);
947
948 if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL, CUPSD_AUTH_NONE))
949 {
950 cupsdCloseClient(con);
951 return;
952 }
953
954 if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
955 {
956 cupsdCloseClient(con);
957 return;
958 }
959 #else
960 if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
961 {
962 cupsdCloseClient(con);
963 return;
964 }
965 #endif /* HAVE_TLS */
966 }
967
968 httpClearFields(con->http);
969 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
970
971 if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
972 {
973 cupsdCloseClient(con);
974 return;
975 }
976 }
977 else if (!is_path_absolute(con->uri))
978 {
979 /*
980 * Protect against malicious users!
981 */
982
983 cupsdLogClient(con, CUPSD_LOG_ERROR,
984 "Request for non-absolute resource \"%s\".", con->uri);
985
986 if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
987 {
988 cupsdCloseClient(con);
989 return;
990 }
991 }
992 else
993 {
994 if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
995 "Upgrade") && !httpIsEncrypted(con->http))
996 {
997 #ifdef HAVE_TLS
998 /*
999 * Do encryption stuff...
1000 */
1001
1002 httpClearFields(con->http);
1003
1004 if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL,
1005 CUPSD_AUTH_NONE))
1006 {
1007 cupsdCloseClient(con);
1008 return;
1009 }
1010
1011 if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
1012 {
1013 cupsdCloseClient(con);
1014 return;
1015 }
1016 #else
1017 if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
1018 {
1019 cupsdCloseClient(con);
1020 return;
1021 }
1022 #endif /* HAVE_TLS */
1023 }
1024
1025 if ((status = cupsdIsAuthorized(con, NULL)) != HTTP_STATUS_OK)
1026 {
1027 cupsdSendError(con, status, CUPSD_AUTH_NONE);
1028 cupsdCloseClient(con);
1029 return;
1030 }
1031
1032 if (httpGetExpect(con->http) &&
1033 (con->operation == HTTP_STATE_POST || con->operation == HTTP_STATE_PUT))
1034 {
1035 if (httpGetExpect(con->http) == HTTP_STATUS_CONTINUE)
1036 {
1037 /*
1038 * Send 100-continue header...
1039 */
1040
1041 if (httpWriteResponse(con->http, HTTP_STATUS_CONTINUE))
1042 {
1043 cupsdCloseClient(con);
1044 return;
1045 }
1046 }
1047 else
1048 {
1049 /*
1050 * Send 417-expectation-failed header...
1051 */
1052
1053 httpClearFields(con->http);
1054 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
1055
1056 cupsdSendError(con, HTTP_STATUS_EXPECTATION_FAILED, CUPSD_AUTH_NONE);
1057 cupsdCloseClient(con);
1058 return;
1059 }
1060 }
1061
1062 switch (httpGetState(con->http))
1063 {
1064 case HTTP_STATE_GET_SEND :
1065 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Processing GET %s", con->uri);
1066
1067 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1068 {
1069 _cupsRWLockRead(&MimeDatabase->lock);
1070
1071 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1072
1073 _cupsRWUnlock(&MimeDatabase->lock);
1074
1075 cupsdLogClient(con, CUPSD_LOG_DEBUG, "filename=\"%s\", type=%s/%s", filename, type ? type->super : "", type ? type->type : "");
1076
1077 if (is_cgi(con, filename, &filestats, type))
1078 {
1079 /*
1080 * Note: con->command and con->options were set by is_cgi()...
1081 */
1082
1083 if (!cupsdSendCommand(con, con->command, con->options, 0))
1084 {
1085 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1086 {
1087 cupsdCloseClient(con);
1088 return;
1089 }
1090 }
1091 else
1092 cupsdLogRequest(con, HTTP_STATUS_OK);
1093
1094 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1095 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1096 break;
1097 }
1098
1099 if (!check_if_modified(con, &filestats))
1100 {
1101 if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
1102 {
1103 cupsdCloseClient(con);
1104 return;
1105 }
1106 }
1107 else
1108 {
1109 if (type == NULL)
1110 strlcpy(line, "text/plain", sizeof(line));
1111 else
1112 snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
1113
1114 if (!write_file(con, HTTP_STATUS_OK, filename, line, &filestats))
1115 {
1116 cupsdCloseClient(con);
1117 return;
1118 }
1119 }
1120 }
1121 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)))
1122 {
1123 if (!WebInterface)
1124 {
1125 /*
1126 * Web interface is disabled. Show an appropriate message...
1127 */
1128
1129 if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
1130 {
1131 cupsdCloseClient(con);
1132 return;
1133 }
1134
1135 break;
1136 }
1137
1138 /*
1139 * Send CGI output...
1140 */
1141
1142 if (!strncmp(con->uri, "/admin", 6))
1143 {
1144 cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
1145 cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
1146 }
1147 else if (!strncmp(con->uri, "/classes", 8))
1148 {
1149 if (strlen(con->uri) > 9)
1150 {
1151 if (con->uri[9] != '?')
1152 {
1153 unsigned int i = 0; // Array index
1154
1155 for (ptr = con->uri + 9; *ptr && *ptr != '?' && i < sizeof(name);)
1156 name[i++] = *ptr++;
1157
1158 name[i] = '\0';
1159
1160 if (!cupsdFindClass(name))
1161 {
1162 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1163 {
1164 cupsdCloseClient(con);
1165 return;
1166 }
1167
1168 break;
1169 }
1170 }
1171 }
1172
1173 cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
1174 if (con->uri[8] && con->uri[9])
1175 cupsdSetString(&con->options, con->uri + 8);
1176 else
1177 cupsdSetString(&con->options, NULL);
1178 }
1179 else if (!strncmp(con->uri, "/jobs", 5))
1180 {
1181 cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
1182 if (con->uri[5] && con->uri[6])
1183 cupsdSetString(&con->options, con->uri + 5);
1184 else
1185 cupsdSetString(&con->options, NULL);
1186 }
1187 else if (!strncmp(con->uri, "/printers", 9))
1188 {
1189 if (strlen(con->uri) > 10)
1190 {
1191 if (con->uri[10] != '?')
1192 {
1193 unsigned int i = 0; // Array index
1194
1195 for (ptr = con->uri + 10; *ptr && *ptr != '?' && i < sizeof(name);)
1196 name[i++] = *ptr++;
1197
1198 name[i] = '\0';
1199
1200 if (!cupsdFindPrinter(name))
1201 {
1202 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1203 {
1204 cupsdCloseClient(con);
1205 return;
1206 }
1207
1208 break;
1209 }
1210 }
1211 }
1212
1213 cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
1214 if (con->uri[9] && con->uri[10])
1215 cupsdSetString(&con->options, con->uri + 9);
1216 else
1217 cupsdSetString(&con->options, NULL);
1218 }
1219 else
1220 {
1221 cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
1222 if (con->uri[5] && con->uri[6])
1223 cupsdSetString(&con->options, con->uri + 5);
1224 else
1225 cupsdSetString(&con->options, NULL);
1226 }
1227
1228 if (!cupsdSendCommand(con, con->command, con->options, 0))
1229 {
1230 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1231 {
1232 cupsdCloseClient(con);
1233 return;
1234 }
1235 }
1236 else
1237 cupsdLogRequest(con, HTTP_STATUS_OK);
1238
1239 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1240 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1241 }
1242 else
1243 {
1244 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1245 {
1246 cupsdCloseClient(con);
1247 return;
1248 }
1249 }
1250 break;
1251
1252 case HTTP_STATE_POST_RECV :
1253 /*
1254 * See if the POST request includes a Content-Length field, and if
1255 * so check the length against any limits that are set...
1256 */
1257
1258 if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
1259 {
1260 /*
1261 * Request too large...
1262 */
1263
1264 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1265 {
1266 cupsdCloseClient(con);
1267 return;
1268 }
1269
1270 break;
1271 }
1272 else if (httpGetLength2(con->http) < 0)
1273 {
1274 /*
1275 * Negative content lengths are invalid!
1276 */
1277
1278 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
1279 {
1280 cupsdCloseClient(con);
1281 return;
1282 }
1283
1284 break;
1285 }
1286
1287 /*
1288 * See what kind of POST request this is; for IPP requests the
1289 * content-type field will be "application/ipp"...
1290 */
1291
1292 if (!strcmp(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE), "application/ipp"))
1293 {
1294 con->request = ippNew();
1295 break;
1296 }
1297 else if (!WebInterface)
1298 {
1299 /*
1300 * Web interface is disabled. Show an appropriate message...
1301 */
1302
1303 if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
1304 {
1305 cupsdCloseClient(con);
1306 return;
1307 }
1308
1309 break;
1310 }
1311
1312 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1313 {
1314 /*
1315 * POST to a file...
1316 */
1317
1318 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1319
1320 if (!is_cgi(con, filename, &filestats, type))
1321 {
1322 /*
1323 * Only POST to CGI's...
1324 */
1325
1326 if (!cupsdSendError(con, HTTP_STATUS_UNAUTHORIZED, CUPSD_AUTH_NONE))
1327 {
1328 cupsdCloseClient(con);
1329 return;
1330 }
1331 }
1332 }
1333 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))
1334 {
1335 /*
1336 * CGI request...
1337 */
1338
1339 if (!strncmp(con->uri, "/admin", 6))
1340 {
1341 cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
1342 cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
1343 }
1344 else if (!strncmp(con->uri, "/printers", 9))
1345 {
1346 cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
1347 if (con->uri[9] && con->uri[10])
1348 cupsdSetString(&con->options, con->uri + 9);
1349 else
1350 cupsdSetString(&con->options, NULL);
1351 }
1352 else if (!strncmp(con->uri, "/classes", 8))
1353 {
1354 cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
1355 if (con->uri[8] && con->uri[9])
1356 cupsdSetString(&con->options, con->uri + 8);
1357 else
1358 cupsdSetString(&con->options, NULL);
1359 }
1360 else if (!strncmp(con->uri, "/jobs", 5))
1361 {
1362 cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
1363 if (con->uri[5] && con->uri[6])
1364 cupsdSetString(&con->options, con->uri + 5);
1365 else
1366 cupsdSetString(&con->options, NULL);
1367 }
1368 else
1369 {
1370 cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
1371 if (con->uri[5] && con->uri[6])
1372 cupsdSetString(&con->options, con->uri + 5);
1373 else
1374 cupsdSetString(&con->options, NULL);
1375 }
1376
1377 if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
1378 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
1379 }
1380 else
1381 {
1382 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1383 {
1384 cupsdCloseClient(con);
1385 return;
1386 }
1387 }
1388 break;
1389
1390 case HTTP_STATE_PUT_RECV :
1391 /*
1392 * Validate the resource name...
1393 */
1394
1395 if (strcmp(con->uri, "/admin/conf/cupsd.conf"))
1396 {
1397 /*
1398 * PUT can only be done to the cupsd.conf file...
1399 */
1400
1401 cupsdLogClient(con, CUPSD_LOG_ERROR, "Disallowed PUT request for \"%s\".", con->uri);
1402
1403 if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
1404 {
1405 cupsdCloseClient(con);
1406 return;
1407 }
1408
1409 break;
1410 }
1411
1412 /*
1413 * See if the PUT request includes a Content-Length field, and if
1414 * so check the length against any limits that are set...
1415 */
1416
1417 if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
1418 {
1419 /*
1420 * Request too large...
1421 */
1422
1423 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1424 {
1425 cupsdCloseClient(con);
1426 return;
1427 }
1428
1429 break;
1430 }
1431 else if (httpGetLength2(con->http) < 0)
1432 {
1433 /*
1434 * Negative content lengths are invalid!
1435 */
1436
1437 if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
1438 {
1439 cupsdCloseClient(con);
1440 return;
1441 }
1442
1443 break;
1444 }
1445
1446 /*
1447 * Open a temporary file to hold the request...
1448 */
1449
1450 cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot, request_id ++);
1451 con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
1452
1453 if (con->file < 0)
1454 {
1455 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to create request file \"%s\": %s", con->filename, strerror(errno));
1456
1457 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1458 {
1459 cupsdCloseClient(con);
1460 return;
1461 }
1462 }
1463
1464 fchmod(con->file, 0640);
1465 fchown(con->file, RunUser, Group);
1466 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1467 break;
1468
1469 case HTTP_STATE_DELETE :
1470 case HTTP_STATE_TRACE :
1471 cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE);
1472 cupsdCloseClient(con);
1473 return;
1474
1475 case HTTP_STATE_HEAD :
1476 if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
1477 {
1478 if (!check_if_modified(con, &filestats))
1479 {
1480 if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
1481 {
1482 cupsdCloseClient(con);
1483 return;
1484 }
1485
1486 cupsdLogRequest(con, HTTP_STATUS_NOT_MODIFIED);
1487 }
1488 else
1489 {
1490 /*
1491 * Serve a file...
1492 */
1493
1494 type = mimeFileType(MimeDatabase, filename, NULL, NULL);
1495 if (type == NULL)
1496 strlcpy(line, "text/plain", sizeof(line));
1497 else
1498 snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
1499
1500 httpClearFields(con->http);
1501
1502 httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED, httpGetDateString(filestats.st_mtime));
1503 httpSetLength(con->http, (size_t)filestats.st_size);
1504
1505 if (!cupsdSendHeader(con, HTTP_STATUS_OK, line, CUPSD_AUTH_NONE))
1506 {
1507 cupsdCloseClient(con);
1508 return;
1509 }
1510
1511 cupsdLogRequest(con, HTTP_STATUS_OK);
1512 }
1513 }
1514 else if (!WebInterface)
1515 {
1516 httpClearFields(con->http);
1517
1518 if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
1519 {
1520 cupsdCloseClient(con);
1521 return;
1522 }
1523
1524 cupsdLogRequest(con, HTTP_STATUS_OK);
1525 break;
1526 }
1527
1528 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)))
1529 {
1530 /*
1531 * CGI output...
1532 */
1533
1534 httpClearFields(con->http);
1535
1536 if (!cupsdSendHeader(con, HTTP_STATUS_OK, "text/html", CUPSD_AUTH_NONE))
1537 {
1538 cupsdCloseClient(con);
1539 return;
1540 }
1541
1542 cupsdLogRequest(con, HTTP_STATUS_OK);
1543 }
1544 else
1545 {
1546 httpClearFields(con->http);
1547
1548 if (!cupsdSendHeader(con, HTTP_STATUS_NOT_FOUND, "text/html", CUPSD_AUTH_NONE))
1549 {
1550 cupsdCloseClient(con);
1551 return;
1552 }
1553
1554 cupsdLogRequest(con, HTTP_STATUS_NOT_FOUND);
1555 }
1556 break;
1557
1558 default :
1559 break; /* Anti-compiler-warning-code */
1560 }
1561 }
1562 }
1563
1564 /*
1565 * Handle any incoming data...
1566 */
1567
1568 switch (httpGetState(con->http))
1569 {
1570 case HTTP_STATE_PUT_RECV :
1571 do
1572 {
1573 if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
1574 {
1575 if (httpError(con->http) && httpError(con->http) != EPIPE)
1576 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1577 "HTTP_STATE_PUT_RECV Closing for error %d (%s)",
1578 httpError(con->http), strerror(httpError(con->http)));
1579 else
1580 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1581 "HTTP_STATE_PUT_RECV Closing on EOF.");
1582
1583 cupsdCloseClient(con);
1584 return;
1585 }
1586 else if (bytes > 0)
1587 {
1588 con->bytes += bytes;
1589
1590 if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
1591 {
1592 close(con->file);
1593 con->file = -1;
1594 unlink(con->filename);
1595 cupsdClearString(&con->filename);
1596
1597 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1598 {
1599 cupsdCloseClient(con);
1600 return;
1601 }
1602 }
1603
1604 if (write(con->file, line, (size_t)bytes) < bytes)
1605 {
1606 cupsdLogClient(con, CUPSD_LOG_ERROR,
1607 "Unable to write %d bytes to \"%s\": %s", bytes,
1608 con->filename, strerror(errno));
1609
1610 close(con->file);
1611 con->file = -1;
1612 unlink(con->filename);
1613 cupsdClearString(&con->filename);
1614
1615 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1616 {
1617 cupsdCloseClient(con);
1618 return;
1619 }
1620 }
1621 }
1622 else if (httpGetState(con->http) == HTTP_STATE_PUT_RECV)
1623 {
1624 cupsdCloseClient(con);
1625 return;
1626 }
1627 }
1628 while (httpGetState(con->http) == HTTP_STATE_PUT_RECV && httpGetReady(con->http));
1629
1630 if (httpGetState(con->http) == HTTP_STATE_STATUS)
1631 {
1632 /*
1633 * End of file, see how big it is...
1634 */
1635
1636 fstat(con->file, &filestats);
1637
1638 close(con->file);
1639 con->file = -1;
1640
1641 if (filestats.st_size > MaxRequestSize &&
1642 MaxRequestSize > 0)
1643 {
1644 /*
1645 * Request is too big; remove it and send an error...
1646 */
1647
1648 unlink(con->filename);
1649 cupsdClearString(&con->filename);
1650
1651 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1652 {
1653 cupsdCloseClient(con);
1654 return;
1655 }
1656 }
1657
1658 /*
1659 * Install the configuration file...
1660 */
1661
1662 status = install_cupsd_conf(con);
1663
1664 /*
1665 * Return the status to the client...
1666 */
1667
1668 if (!cupsdSendError(con, status, CUPSD_AUTH_NONE))
1669 {
1670 cupsdCloseClient(con);
1671 return;
1672 }
1673 }
1674 break;
1675
1676 case HTTP_STATE_POST_RECV :
1677 do
1678 {
1679 if (con->request && con->file < 0)
1680 {
1681 /*
1682 * Grab any request data from the connection...
1683 */
1684
1685 if (!httpWait(con->http, 0))
1686 return;
1687
1688 if ((ipp_state = ippRead(con->http, con->request)) == IPP_STATE_ERROR)
1689 {
1690 cupsdLogClient(con, CUPSD_LOG_ERROR, "IPP read error: %s",
1691 cupsLastErrorString());
1692
1693 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
1694 cupsdCloseClient(con);
1695 return;
1696 }
1697 else if (ipp_state != IPP_STATE_DATA)
1698 {
1699 if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
1700 {
1701 cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
1702 cupsdCloseClient(con);
1703 return;
1704 }
1705
1706 if (httpGetReady(con->http))
1707 continue;
1708 break;
1709 }
1710 else
1711 {
1712 cupsdLogClient(con, CUPSD_LOG_DEBUG, "%d.%d %s %d",
1713 con->request->request.op.version[0],
1714 con->request->request.op.version[1],
1715 ippOpString(con->request->request.op.operation_id),
1716 con->request->request.op.request_id);
1717 con->bytes += (off_t)ippLength(con->request);
1718 }
1719 }
1720
1721 if (con->file < 0 && httpGetState(con->http) != HTTP_STATE_POST_SEND)
1722 {
1723 /*
1724 * Create a file as needed for the request data...
1725 */
1726
1727 cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot,
1728 request_id ++);
1729 con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
1730
1731 if (con->file < 0)
1732 {
1733 cupsdLogClient(con, CUPSD_LOG_ERROR,
1734 "Unable to create request file \"%s\": %s",
1735 con->filename, strerror(errno));
1736
1737 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1738 {
1739 cupsdCloseClient(con);
1740 return;
1741 }
1742 }
1743
1744 fchmod(con->file, 0640);
1745 fchown(con->file, RunUser, Group);
1746 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1747 }
1748
1749 if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
1750 {
1751 if (!httpWait(con->http, 0))
1752 return;
1753 else if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
1754 {
1755 if (httpError(con->http) && httpError(con->http) != EPIPE)
1756 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1757 "HTTP_STATE_POST_SEND Closing for error %d (%s)",
1758 httpError(con->http), strerror(httpError(con->http)));
1759 else
1760 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1761 "HTTP_STATE_POST_SEND Closing on EOF.");
1762
1763 cupsdCloseClient(con);
1764 return;
1765 }
1766 else if (bytes > 0)
1767 {
1768 con->bytes += bytes;
1769
1770 if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
1771 {
1772 close(con->file);
1773 con->file = -1;
1774 unlink(con->filename);
1775 cupsdClearString(&con->filename);
1776
1777 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1778 {
1779 cupsdCloseClient(con);
1780 return;
1781 }
1782 }
1783
1784 if (write(con->file, line, (size_t)bytes) < bytes)
1785 {
1786 cupsdLogClient(con, CUPSD_LOG_ERROR,
1787 "Unable to write %d bytes to \"%s\": %s",
1788 bytes, con->filename, strerror(errno));
1789
1790 close(con->file);
1791 con->file = -1;
1792 unlink(con->filename);
1793 cupsdClearString(&con->filename);
1794
1795 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE,
1796 CUPSD_AUTH_NONE))
1797 {
1798 cupsdCloseClient(con);
1799 return;
1800 }
1801 }
1802 }
1803 else if (httpGetState(con->http) == HTTP_STATE_POST_RECV)
1804 return;
1805 else if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
1806 {
1807 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1808 "Closing on unexpected state %s.",
1809 httpStateString(httpGetState(con->http)));
1810 cupsdCloseClient(con);
1811 return;
1812 }
1813 }
1814 }
1815 while (httpGetState(con->http) == HTTP_STATE_POST_RECV && httpGetReady(con->http));
1816
1817 if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
1818 {
1819 if (con->file >= 0)
1820 {
1821 if (fstat(con->file, &filestats))
1822 filestats.st_size = 0;
1823
1824 close(con->file);
1825 con->file = -1;
1826
1827 if (filestats.st_size > MaxRequestSize &&
1828 MaxRequestSize > 0)
1829 {
1830 /*
1831 * Request is too big; remove it and send an error...
1832 */
1833
1834 unlink(con->filename);
1835 cupsdClearString(&con->filename);
1836
1837 if (con->request)
1838 {
1839 /*
1840 * Delete any IPP request data...
1841 */
1842
1843 ippDelete(con->request);
1844 con->request = NULL;
1845 }
1846
1847 if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
1848 {
1849 cupsdCloseClient(con);
1850 return;
1851 }
1852 }
1853 else if (filestats.st_size == 0)
1854 {
1855 /*
1856 * Don't allow empty file...
1857 */
1858
1859 unlink(con->filename);
1860 cupsdClearString(&con->filename);
1861 }
1862
1863 if (con->command)
1864 {
1865 if (!cupsdSendCommand(con, con->command, con->options, 0))
1866 {
1867 if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
1868 {
1869 cupsdCloseClient(con);
1870 return;
1871 }
1872 }
1873 else
1874 cupsdLogRequest(con, HTTP_STATUS_OK);
1875 }
1876 }
1877
1878 if (con->request)
1879 {
1880 cupsdProcessIPPRequest(con);
1881
1882 if (con->filename)
1883 {
1884 unlink(con->filename);
1885 cupsdClearString(&con->filename);
1886 }
1887
1888 return;
1889 }
1890 }
1891 break;
1892
1893 default :
1894 break; /* Anti-compiler-warning-code */
1895 }
1896
1897 if (httpGetState(con->http) == HTTP_STATE_WAITING)
1898 {
1899 if (!httpGetKeepAlive(con->http))
1900 {
1901 cupsdLogClient(con, CUPSD_LOG_DEBUG,
1902 "Closing because Keep-Alive is disabled.");
1903 cupsdCloseClient(con);
1904 }
1905 else
1906 {
1907 cupsArrayRemove(ActiveClients, con);
1908 cupsdSetBusyState(0);
1909 }
1910 }
1911 }
1912
1913
1914 /*
1915 * 'cupsdSendCommand()' - Send output from a command via HTTP.
1916 */
1917
1918 int /* O - 1 on success, 0 on failure */
cupsdSendCommand(cupsd_client_t * con,char * command,char * options,int root)1919 cupsdSendCommand(
1920 cupsd_client_t *con, /* I - Client connection */
1921 char *command, /* I - Command to run */
1922 char *options, /* I - Command-line options */
1923 int root) /* I - Run as root? */
1924 {
1925 int fd; /* Standard input file descriptor */
1926
1927
1928 if (con->filename)
1929 {
1930 fd = open(con->filename, O_RDONLY);
1931
1932 if (fd < 0)
1933 {
1934 cupsdLogClient(con, CUPSD_LOG_ERROR,
1935 "Unable to open \"%s\" for reading: %s",
1936 con->filename ? con->filename : "/dev/null",
1937 strerror(errno));
1938 return (0);
1939 }
1940
1941 fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
1942 }
1943 else
1944 fd = -1;
1945
1946 con->pipe_pid = pipe_command(con, fd, &(con->file), command, options, root);
1947 con->pipe_status = HTTP_STATUS_OK;
1948
1949 httpClearFields(con->http);
1950
1951 if (fd >= 0)
1952 close(fd);
1953
1954 cupsdLogClient(con, CUPSD_LOG_INFO, "Started \"%s\" (pid=%d, file=%d)",
1955 command, con->pipe_pid, con->file);
1956
1957 if (con->pipe_pid == 0)
1958 return (0);
1959
1960 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
1961
1962 cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
1963
1964 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
1965
1966 con->sent_header = 0;
1967 con->file_ready = 0;
1968 con->got_fields = 0;
1969 con->header_used = 0;
1970
1971 return (1);
1972 }
1973
1974
1975 /*
1976 * 'cupsdSendError()' - Send an error message via HTTP.
1977 */
1978
1979 int /* O - 1 if successful, 0 otherwise */
cupsdSendError(cupsd_client_t * con,http_status_t code,int auth_type)1980 cupsdSendError(cupsd_client_t *con, /* I - Connection */
1981 http_status_t code, /* I - Error code */
1982 int auth_type)/* I - Authentication type */
1983 {
1984 char location[HTTP_MAX_VALUE]; /* Location field */
1985
1986
1987 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendError code=%d, auth_type=%d", code, auth_type);
1988
1989 #ifdef HAVE_TLS
1990 /*
1991 * Force client to upgrade for authentication if that is how the
1992 * server is configured...
1993 */
1994
1995 if (code == HTTP_STATUS_UNAUTHORIZED &&
1996 DefaultEncryption == HTTP_ENCRYPTION_REQUIRED &&
1997 _cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost") &&
1998 !httpIsEncrypted(con->http))
1999 {
2000 code = HTTP_STATUS_UPGRADE_REQUIRED;
2001 }
2002 #endif /* HAVE_TLS */
2003
2004 /*
2005 * Put the request in the access_log file...
2006 */
2007
2008 cupsdLogRequest(con, code);
2009
2010 /*
2011 * To work around bugs in some proxies, don't use Keep-Alive for some
2012 * error messages...
2013 *
2014 * Kerberos authentication doesn't work without Keep-Alive, so
2015 * never disable it in that case.
2016 */
2017
2018 strlcpy(location, httpGetField(con->http, HTTP_FIELD_LOCATION), sizeof(location));
2019
2020 httpClearFields(con->http);
2021 httpClearCookie(con->http);
2022
2023 httpSetField(con->http, HTTP_FIELD_LOCATION, location);
2024
2025 if (code >= HTTP_STATUS_BAD_REQUEST && con->type != CUPSD_AUTH_NEGOTIATE)
2026 httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
2027
2028 if (httpGetVersion(con->http) >= HTTP_VERSION_1_1 &&
2029 httpGetKeepAlive(con->http) == HTTP_KEEPALIVE_OFF)
2030 httpSetField(con->http, HTTP_FIELD_CONNECTION, "close");
2031
2032 if (code >= HTTP_STATUS_BAD_REQUEST)
2033 {
2034 /*
2035 * Send a human-readable error message.
2036 */
2037
2038 char message[4096], /* Message for user */
2039 urltext[1024], /* URL redirection text */
2040 redirect[1024]; /* Redirection link */
2041 const char *text; /* Status-specific text */
2042
2043
2044 redirect[0] = '\0';
2045
2046 if (code == HTTP_STATUS_UNAUTHORIZED)
2047 {
2048 text = _cupsLangString(con->language,
2049 _("Enter your username and password or the "
2050 "root username and password to access this "
2051 "page. If you are using Kerberos authentication, "
2052 "make sure you have a valid Kerberos ticket."));
2053 }
2054 else if (code == HTTP_STATUS_FORBIDDEN)
2055 {
2056 if (con->username[0])
2057 text = _cupsLangString(con->language, _("Your account does not have the necessary privileges."));
2058 else
2059 text = _cupsLangString(con->language, _("You cannot access this page."));
2060 }
2061 else if (code == HTTP_STATUS_UPGRADE_REQUIRED)
2062 {
2063 text = urltext;
2064
2065 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);
2066
2067 snprintf(redirect, sizeof(redirect), "<META HTTP-EQUIV=\"Refresh\" CONTENT=\"3;URL=https://%s:%d%s\">\n", con->servername, con->serverport, con->uri);
2068 }
2069 else if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
2070 text = _cupsLangString(con->language,
2071 _("The web interface is currently disabled. Run "
2072 "\"cupsctl WebInterface=yes\" to enable it."));
2073 else
2074 text = "";
2075
2076 snprintf(message, sizeof(message),
2077 "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
2078 "\"http://www.w3.org/TR/html4/loose.dtd\">\n"
2079 "<HTML>\n"
2080 "<HEAD>\n"
2081 "\t<META HTTP-EQUIV=\"Content-Type\" "
2082 "CONTENT=\"text/html; charset=utf-8\">\n"
2083 "\t<TITLE>%s - " CUPS_SVERSION "</TITLE>\n"
2084 "\t<LINK REL=\"STYLESHEET\" TYPE=\"text/css\" "
2085 "HREF=\"/cups.css\">\n"
2086 "%s"
2087 "</HEAD>\n"
2088 "<BODY>\n"
2089 "<H1>%s</H1>\n"
2090 "<P>%s</P>\n"
2091 "</BODY>\n"
2092 "</HTML>\n",
2093 _httpStatus(con->language, code), redirect,
2094 _httpStatus(con->language, code), text);
2095
2096 /*
2097 * Send an error message back to the client. If the error code is a
2098 * 400 or 500 series, make sure the message contains some text, too!
2099 */
2100
2101 size_t length = strlen(message); /* Length of message */
2102
2103 httpSetLength(con->http, length);
2104
2105 if (!cupsdSendHeader(con, code, "text/html", auth_type))
2106 return (0);
2107
2108 if (httpWrite2(con->http, message, length) < 0)
2109 return (0);
2110
2111 if (httpFlushWrite(con->http) < 0)
2112 return (0);
2113 }
2114 else
2115 {
2116 httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
2117
2118 if (!cupsdSendHeader(con, code, NULL, auth_type))
2119 return (0);
2120 }
2121
2122 return (1);
2123 }
2124
2125
2126 /*
2127 * 'cupsdSendHeader()' - Send an HTTP request.
2128 */
2129
2130 int /* O - 1 on success, 0 on failure */
cupsdSendHeader(cupsd_client_t * con,http_status_t code,char * type,int auth_type)2131 cupsdSendHeader(
2132 cupsd_client_t *con, /* I - Client to send to */
2133 http_status_t code, /* I - HTTP status code */
2134 char *type, /* I - MIME type of document */
2135 int auth_type) /* I - Type of authentication */
2136 {
2137 char auth_str[1024]; /* Authorization string */
2138
2139
2140 cupsdLogClient(con, CUPSD_LOG_DEBUG, "cupsdSendHeader: code=%d, type=\"%s\", auth_type=%d", code, type, auth_type);
2141
2142 /*
2143 * Send the HTTP status header...
2144 */
2145
2146 if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
2147 {
2148 /*
2149 * Treat our special "web interface is disabled" status as "200 OK" for web
2150 * browsers.
2151 */
2152
2153 code = HTTP_STATUS_OK;
2154 }
2155
2156 if (code == HTTP_STATUS_METHOD_NOT_ALLOWED)
2157 httpSetField(con->http, HTTP_FIELD_ALLOW, "GET, HEAD, OPTIONS, POST, PUT");
2158
2159 if (code == HTTP_STATUS_UNAUTHORIZED)
2160 {
2161 if (auth_type == CUPSD_AUTH_NONE)
2162 {
2163 if (!con->best || con->best->type <= CUPSD_AUTH_NONE)
2164 auth_type = cupsdDefaultAuthType();
2165 else
2166 auth_type = con->best->type;
2167 }
2168
2169 auth_str[0] = '\0';
2170
2171 if (auth_type == CUPSD_AUTH_BASIC)
2172 {
2173 strlcpy(auth_str, "Basic realm=\"CUPS\"", sizeof(auth_str));
2174 }
2175 else if (auth_type == CUPSD_AUTH_NEGOTIATE)
2176 {
2177 strlcpy(auth_str, "Negotiate", sizeof(auth_str));
2178 }
2179
2180 if (con->best && !con->is_browser && !_cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost"))
2181 {
2182 /*
2183 * Add a "trc" (try root certification) parameter for local
2184 * requests when the request requires system group membership - then the
2185 * client knows the root certificate can/should be used.
2186 *
2187 * Also, for macOS we also look for @AUTHKEY and add an "AuthRef key=foo"
2188 * method as needed...
2189 */
2190
2191 char *name, /* Current user name */
2192 *auth_key; /* Auth key buffer */
2193 size_t auth_size; /* Size of remaining buffer */
2194 int need_local = 1; /* Do we need to list "Local" method? */
2195
2196 auth_key = auth_str + strlen(auth_str);
2197 auth_size = sizeof(auth_str) - (size_t)(auth_key - auth_str);
2198
2199 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
2200 if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
2201 {
2202 strlcpy(auth_key, ", PeerCred", auth_size);
2203 auth_key += 10;
2204 auth_size -= 10;
2205 }
2206 #endif /* SO_PEERCRED && AF_LOCAL */
2207
2208 for (name = (char *)cupsArrayFirst(con->best->names);
2209 name;
2210 name = (char *)cupsArrayNext(con->best->names))
2211 {
2212 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendHeader: require \"%s\"", name);
2213
2214 #ifdef HAVE_AUTHORIZATION_H
2215 if (!_cups_strncasecmp(name, "@AUTHKEY(", 9))
2216 {
2217 snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", name + 9);
2218 need_local = 0;
2219 /* end parenthesis is stripped in conf.c */
2220 break;
2221 }
2222 else
2223 #endif /* HAVE_AUTHORIZATION_H */
2224 if (!_cups_strcasecmp(name, "@SYSTEM"))
2225 {
2226 #ifdef HAVE_AUTHORIZATION_H
2227 if (SystemGroupAuthKey)
2228 snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", SystemGroupAuthKey);
2229 else
2230 #endif /* HAVE_AUTHORIZATION_H */
2231 strlcpy(auth_key, ", Local trc=\"y\"", auth_size);
2232 need_local = 0;
2233 break;
2234 }
2235 }
2236
2237 if (need_local)
2238 strlcat(auth_key, ", Local", auth_size);
2239 }
2240
2241 if (auth_str[0])
2242 {
2243 cupsdLogClient(con, CUPSD_LOG_DEBUG, "WWW-Authenticate: %s", auth_str);
2244
2245 httpSetField(con->http, HTTP_FIELD_WWW_AUTHENTICATE, auth_str);
2246 }
2247 }
2248
2249 if (con->language && strcmp(con->language->language, "C"))
2250 httpSetField(con->http, HTTP_FIELD_CONTENT_LANGUAGE, con->language->language);
2251
2252 if (type)
2253 {
2254 if (!strcmp(type, "text/html"))
2255 httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, "text/html; charset=utf-8");
2256 else
2257 httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, type);
2258 }
2259
2260 return (!httpWriteResponse(con->http, code));
2261 }
2262
2263
2264 /*
2265 * 'cupsdUpdateCGI()' - Read status messages from CGI scripts and programs.
2266 */
2267
2268 void
cupsdUpdateCGI(void)2269 cupsdUpdateCGI(void)
2270 {
2271 char *ptr, /* Pointer to end of line in buffer */
2272 message[1024]; /* Pointer to message text */
2273 int loglevel; /* Log level for message */
2274
2275
2276 while ((ptr = cupsdStatBufUpdate(CGIStatusBuffer, &loglevel,
2277 message, sizeof(message))) != NULL)
2278 {
2279 if (loglevel == CUPSD_LOG_INFO)
2280 cupsdLogMessage(CUPSD_LOG_INFO, "%s", message);
2281
2282 if (!strchr(CGIStatusBuffer->buffer, '\n'))
2283 break;
2284 }
2285
2286 if (ptr == NULL && !CGIStatusBuffer->bufused)
2287 {
2288 /*
2289 * Fatal error on pipe - should never happen!
2290 */
2291
2292 cupsdLogMessage(CUPSD_LOG_CRIT,
2293 "cupsdUpdateCGI: error reading from CGI error pipe - %s",
2294 strerror(errno));
2295 }
2296 }
2297
2298
2299 /*
2300 * 'cupsdWriteClient()' - Write data to a client as needed.
2301 */
2302
2303 void
cupsdWriteClient(cupsd_client_t * con)2304 cupsdWriteClient(cupsd_client_t *con) /* I - Client connection */
2305 {
2306 int bytes, /* Number of bytes written */
2307 field_col; /* Current column */
2308 char *bufptr, /* Pointer into buffer */
2309 *bufend; /* Pointer to end of buffer */
2310 ipp_state_t ipp_state; /* IPP state value */
2311
2312
2313 cupsdLogClient(con, CUPSD_LOG_DEBUG, "con->http=%p", con->http);
2314 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2315 "cupsdWriteClient "
2316 "error=%d, "
2317 "used=%d, "
2318 "state=%s, "
2319 "data_encoding=HTTP_ENCODING_%s, "
2320 "data_remaining=" CUPS_LLFMT ", "
2321 "response=%p(%s), "
2322 "pipe_pid=%d, "
2323 "file=%d",
2324 httpError(con->http), (int)httpGetReady(con->http),
2325 httpStateString(httpGetState(con->http)),
2326 httpIsChunked(con->http) ? "CHUNKED" : "LENGTH",
2327 CUPS_LLCAST httpGetLength2(con->http),
2328 con->response,
2329 con->response ? ippStateString(ippGetState(con->request)) : "",
2330 con->pipe_pid, con->file);
2331
2332 if (httpGetState(con->http) != HTTP_STATE_GET_SEND &&
2333 httpGetState(con->http) != HTTP_STATE_POST_SEND)
2334 {
2335 /*
2336 * If we get called in the wrong state, then something went wrong with the
2337 * connection and we need to shut it down...
2338 */
2339
2340 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP write state %s.",
2341 httpStateString(httpGetState(con->http)));
2342 cupsdCloseClient(con);
2343 return;
2344 }
2345
2346 if (con->pipe_pid)
2347 {
2348 /*
2349 * Make sure we select on the CGI output...
2350 */
2351
2352 cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
2353
2354 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
2355
2356 if (!con->file_ready)
2357 {
2358 /*
2359 * Try again later when there is CGI output available...
2360 */
2361
2362 cupsdRemoveSelect(httpGetFd(con->http));
2363 return;
2364 }
2365
2366 con->file_ready = 0;
2367 }
2368
2369 bytes = (ssize_t)(sizeof(con->header) - (size_t)con->header_used);
2370
2371 if (!con->pipe_pid && bytes > (ssize_t)httpGetRemaining(con->http))
2372 {
2373 /*
2374 * Limit GET bytes to original size of file (STR #3265)...
2375 */
2376
2377 bytes = (ssize_t)httpGetRemaining(con->http);
2378 }
2379
2380 if (con->response && con->response->state != IPP_STATE_DATA)
2381 {
2382 size_t wused = httpGetPending(con->http); /* Previous write buffer use */
2383
2384 do
2385 {
2386 /*
2387 * Write a single attribute or the IPP message header...
2388 */
2389
2390 ipp_state = ippWrite(con->http, con->response);
2391
2392 /*
2393 * If the write buffer has been flushed, stop buffering up attributes...
2394 */
2395
2396 if (httpGetPending(con->http) <= wused)
2397 break;
2398 }
2399 while (ipp_state != IPP_STATE_DATA && ipp_state != IPP_STATE_ERROR);
2400
2401 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2402 "Writing IPP response, ipp_state=%s, old "
2403 "wused=" CUPS_LLFMT ", new wused=" CUPS_LLFMT,
2404 ippStateString(ipp_state),
2405 CUPS_LLCAST wused, CUPS_LLCAST httpGetPending(con->http));
2406
2407 if (httpGetPending(con->http) > 0)
2408 httpFlushWrite(con->http);
2409
2410 bytes = ipp_state != IPP_STATE_ERROR &&
2411 (con->file >= 0 || ipp_state != IPP_STATE_DATA);
2412
2413 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2414 "bytes=%d, http_state=%d, data_remaining=" CUPS_LLFMT,
2415 (int)bytes, httpGetState(con->http),
2416 CUPS_LLCAST httpGetLength2(con->http));
2417 }
2418 else if ((bytes = read(con->file, con->header + con->header_used, (size_t)bytes)) > 0)
2419 {
2420 con->header_used += bytes;
2421
2422 if (con->pipe_pid && !con->got_fields)
2423 {
2424 /*
2425 * Inspect the data for Content-Type and other fields.
2426 */
2427
2428 for (bufptr = con->header, bufend = con->header + con->header_used,
2429 field_col = 0;
2430 !con->got_fields && bufptr < bufend;
2431 bufptr ++)
2432 {
2433 if (*bufptr == '\n')
2434 {
2435 /*
2436 * Send line to client...
2437 */
2438
2439 if (bufptr > con->header && bufptr[-1] == '\r')
2440 bufptr[-1] = '\0';
2441 *bufptr++ = '\0';
2442
2443 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Script header: %s", con->header);
2444
2445 if (!con->sent_header)
2446 {
2447 /*
2448 * Handle redirection and CGI status codes...
2449 */
2450
2451 http_field_t field; /* HTTP field */
2452 char *value = strchr(con->header, ':');
2453 /* Value of field */
2454
2455 if (value)
2456 {
2457 *value++ = '\0';
2458 while (isspace(*value & 255))
2459 value ++;
2460 }
2461
2462 field = httpFieldValue(con->header);
2463
2464 if (field != HTTP_FIELD_UNKNOWN && value)
2465 {
2466 httpSetField(con->http, field, value);
2467
2468 if (field == HTTP_FIELD_LOCATION)
2469 con->pipe_status = HTTP_STATUS_SEE_OTHER;
2470 }
2471 else if (!_cups_strcasecmp(con->header, "Status") && value)
2472 con->pipe_status = (http_status_t)atoi(value);
2473 else if (!_cups_strcasecmp(con->header, "Set-Cookie") && value)
2474 httpSetCookie(con->http, value);
2475 }
2476
2477 /*
2478 * Update buffer...
2479 */
2480
2481 con->header_used -= bufptr - con->header;
2482
2483 if (con->header_used > 0)
2484 memmove(con->header, bufptr, (size_t)con->header_used);
2485
2486 bufptr = con->header - 1;
2487
2488 /*
2489 * See if the line was empty...
2490 */
2491
2492 if (field_col == 0)
2493 {
2494 con->got_fields = 1;
2495
2496 if (httpGetVersion(con->http) == HTTP_VERSION_1_1 &&
2497 !httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0])
2498 httpSetLength(con->http, 0);
2499
2500 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending status %d for CGI.", con->pipe_status);
2501
2502 if (con->pipe_status == HTTP_STATUS_OK)
2503 {
2504 if (!cupsdSendHeader(con, con->pipe_status, NULL, CUPSD_AUTH_NONE))
2505 {
2506 cupsdCloseClient(con);
2507 return;
2508 }
2509
2510 con->sent_header = 1;
2511 }
2512 else
2513 {
2514 if (!cupsdSendError(con, con->pipe_status, CUPSD_AUTH_NONE))
2515 {
2516 cupsdCloseClient(con);
2517 return;
2518 }
2519
2520 con->sent_header = 1;
2521 }
2522 }
2523 else
2524 field_col = 0;
2525 }
2526 else if (*bufptr != '\r')
2527 field_col ++;
2528 }
2529
2530 if (!con->got_fields)
2531 return;
2532 }
2533
2534 if (con->header_used > 0)
2535 {
2536 if (httpWrite2(con->http, con->header, (size_t)con->header_used) < 0)
2537 {
2538 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
2539 httpError(con->http), strerror(httpError(con->http)));
2540 cupsdCloseClient(con);
2541 return;
2542 }
2543
2544 if (httpIsChunked(con->http))
2545 httpFlushWrite(con->http);
2546
2547 con->bytes += con->header_used;
2548
2549 if (httpGetState(con->http) == HTTP_STATE_WAITING)
2550 bytes = 0;
2551 else
2552 bytes = con->header_used;
2553
2554 con->header_used = 0;
2555 }
2556 }
2557
2558 if (bytes <= 0 ||
2559 (httpGetState(con->http) != HTTP_STATE_GET_SEND &&
2560 httpGetState(con->http) != HTTP_STATE_POST_SEND))
2561 {
2562 if (!con->sent_header && con->pipe_pid)
2563 cupsdSendError(con, HTTP_STATUS_SERVER_ERROR, CUPSD_AUTH_NONE);
2564 else
2565 {
2566 cupsdLogRequest(con, HTTP_STATUS_OK);
2567
2568 if (httpIsChunked(con->http) && (!con->pipe_pid || con->sent_header > 0))
2569 {
2570 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending 0-length chunk.");
2571
2572 if (httpWrite2(con->http, "", 0) < 0)
2573 {
2574 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
2575 httpError(con->http), strerror(httpError(con->http)));
2576 cupsdCloseClient(con);
2577 return;
2578 }
2579 }
2580
2581 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Flushing write buffer.");
2582 httpFlushWrite(con->http);
2583 cupsdLogClient(con, CUPSD_LOG_DEBUG, "New state is %s", httpStateString(httpGetState(con->http)));
2584 }
2585
2586 cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL, con);
2587
2588 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
2589
2590 if (con->file >= 0)
2591 {
2592 cupsdRemoveSelect(con->file);
2593
2594 if (con->pipe_pid)
2595 cupsdEndProcess(con->pipe_pid, 0);
2596
2597 close(con->file);
2598 con->file = -1;
2599 con->pipe_pid = 0;
2600 }
2601
2602 if (con->filename)
2603 {
2604 unlink(con->filename);
2605 cupsdClearString(&con->filename);
2606 }
2607
2608 if (con->request)
2609 {
2610 ippDelete(con->request);
2611 con->request = NULL;
2612 }
2613
2614 if (con->response)
2615 {
2616 ippDelete(con->response);
2617 con->response = NULL;
2618 }
2619
2620 cupsdClearString(&con->command);
2621 cupsdClearString(&con->options);
2622 cupsdClearString(&con->query_string);
2623
2624 if (!httpGetKeepAlive(con->http))
2625 {
2626 cupsdLogClient(con, CUPSD_LOG_DEBUG,
2627 "Closing because Keep-Alive is disabled.");
2628 cupsdCloseClient(con);
2629 return;
2630 }
2631 else
2632 {
2633 cupsArrayRemove(ActiveClients, con);
2634 cupsdSetBusyState(0);
2635 }
2636 }
2637 }
2638
2639
2640 /*
2641 * 'check_if_modified()' - Decode an "If-Modified-Since" line.
2642 */
2643
2644 static int /* O - 1 if modified since */
check_if_modified(cupsd_client_t * con,struct stat * filestats)2645 check_if_modified(
2646 cupsd_client_t *con, /* I - Client connection */
2647 struct stat *filestats) /* I - File information */
2648 {
2649 const char *ptr; /* Pointer into field */
2650 time_t date; /* Time/date value */
2651 off_t size; /* Size/length value */
2652
2653
2654 size = 0;
2655 date = 0;
2656 ptr = httpGetField(con->http, HTTP_FIELD_IF_MODIFIED_SINCE);
2657
2658 if (*ptr == '\0')
2659 return (1);
2660
2661 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);
2662
2663 while (*ptr != '\0')
2664 {
2665 while (isspace(*ptr) || *ptr == ';')
2666 ptr ++;
2667
2668 if (_cups_strncasecmp(ptr, "length=", 7) == 0)
2669 {
2670 ptr += 7;
2671 size = strtoll(ptr, NULL, 10);
2672
2673 while (isdigit(*ptr))
2674 ptr ++;
2675 }
2676 else if (isalpha(*ptr))
2677 {
2678 date = httpGetDateTime(ptr);
2679 while (*ptr != '\0' && *ptr != ';')
2680 ptr ++;
2681 }
2682 else
2683 ptr ++;
2684 }
2685
2686 return ((size != filestats->st_size && size != 0) ||
2687 (date < filestats->st_mtime && date != 0) ||
2688 (size == 0 && date == 0));
2689 }
2690
2691
2692 /*
2693 * 'compare_clients()' - Compare two client connections.
2694 */
2695
2696 static int /* O - Result of comparison */
compare_clients(cupsd_client_t * a,cupsd_client_t * b,void * data)2697 compare_clients(cupsd_client_t *a, /* I - First client */
2698 cupsd_client_t *b, /* I - Second client */
2699 void *data) /* I - User data (not used) */
2700 {
2701 (void)data;
2702
2703 if (a == b)
2704 return (0);
2705 else if (a < b)
2706 return (-1);
2707 else
2708 return (1);
2709 }
2710
2711
2712 #ifdef HAVE_TLS
2713 /*
2714 * 'cupsd_start_tls()' - Start encryption on a connection.
2715 */
2716
2717 static int /* O - 0 on success, -1 on error */
cupsd_start_tls(cupsd_client_t * con,http_encryption_t e)2718 cupsd_start_tls(cupsd_client_t *con, /* I - Client connection */
2719 http_encryption_t e) /* I - Encryption mode */
2720 {
2721 if (httpEncryption(con->http, e))
2722 {
2723 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to encrypt connection: %s",
2724 cupsLastErrorString());
2725 return (-1);
2726 }
2727
2728 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Connection now encrypted.");
2729 return (0);
2730 }
2731 #endif /* HAVE_TLS */
2732
2733
2734 /*
2735 * 'get_file()' - Get a filename and state info.
2736 */
2737
2738 static char * /* O - Real filename */
get_file(cupsd_client_t * con,struct stat * filestats,char * filename,size_t len)2739 get_file(cupsd_client_t *con, /* I - Client connection */
2740 struct stat *filestats, /* O - File information */
2741 char *filename, /* IO - Filename buffer */
2742 size_t len) /* I - Buffer length */
2743 {
2744 int status; /* Status of filesystem calls */
2745 char *ptr; /* Pointer info filename */
2746 size_t plen; /* Remaining length after pointer */
2747 char language[7], /* Language subdirectory, if any */
2748 dest[1024]; /* Destination name */
2749 int perm_check = 1; /* Do permissions check? */
2750 cupsd_printer_t *p; /* Printer */
2751
2752
2753 /*
2754 * Figure out the real filename...
2755 */
2756
2757 filename[0] = '\0';
2758 language[0] = '\0';
2759
2760 if (!strncmp(con->uri, "/help", 5) && (con->uri[5] == '/' || !con->uri[5]))
2761 {
2762 /*
2763 * All help files are served by the help.cgi program...
2764 */
2765
2766 return (NULL);
2767 }
2768 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"))
2769 {
2770 strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
2771 dest[strlen(dest) - 4] = '\0'; /* Strip .ppd */
2772
2773 if ((p = cupsdFindDest(dest)) == NULL)
2774 {
2775 strlcpy(filename, "/", len);
2776 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2777 return (NULL);
2778 }
2779
2780 if (p->type & CUPS_PRINTER_CLASS)
2781 {
2782 int i; /* Looping var */
2783
2784 for (i = 0; i < p->num_printers; i ++)
2785 {
2786 if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
2787 {
2788 snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->printers[i]->name);
2789 if (!access(filename, 0))
2790 {
2791 p = p->printers[i];
2792 break;
2793 }
2794 }
2795 }
2796
2797 if (i >= p->num_printers)
2798 p = NULL;
2799 }
2800 else
2801 snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->name);
2802
2803 perm_check = 0;
2804 }
2805 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"))
2806 {
2807 strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
2808 dest[strlen(dest) - 4] = '\0'; /* Strip .png */
2809
2810 if ((p = cupsdFindDest(dest)) == NULL)
2811 {
2812 strlcpy(filename, "/", len);
2813 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2814 return (NULL);
2815 }
2816
2817 if (p->type & CUPS_PRINTER_CLASS)
2818 {
2819 int i; /* Looping var */
2820
2821 for (i = 0; i < p->num_printers; i ++)
2822 {
2823 if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
2824 {
2825 snprintf(filename, len, "%s/images/%s.png", CacheDir, p->printers[i]->name);
2826 if (!access(filename, 0))
2827 {
2828 p = p->printers[i];
2829 break;
2830 }
2831 }
2832 }
2833
2834 if (i >= p->num_printers)
2835 p = NULL;
2836 }
2837 else
2838 snprintf(filename, len, "%s/images/%s.png", CacheDir, p->name);
2839
2840 if (access(filename, F_OK) < 0)
2841 snprintf(filename, len, "%s/images/generic.png", DocumentRoot);
2842
2843 perm_check = 0;
2844 }
2845 else if (!strcmp(con->uri, "/admin/conf/cupsd.conf"))
2846 {
2847 strlcpy(filename, ConfigurationFile, len);
2848
2849 perm_check = 0;
2850 }
2851 else if (!strncmp(con->uri, "/admin/log/", 11))
2852 {
2853 if (!strncmp(con->uri + 11, "access_log", 10) && AccessLog[0] == '/')
2854 strlcpy(filename, AccessLog, len);
2855 else if (!strncmp(con->uri + 11, "error_log", 9) && ErrorLog[0] == '/')
2856 strlcpy(filename, ErrorLog, len);
2857 else if (!strncmp(con->uri + 11, "page_log", 8) && PageLog[0] == '/')
2858 strlcpy(filename, PageLog, len);
2859 else
2860 return (NULL);
2861
2862 perm_check = 0;
2863 }
2864 else if (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9))
2865 {
2866 /*
2867 * Admin/class/job/printer pages are served by CGI...
2868 */
2869
2870 return (NULL);
2871 }
2872 else if (!strncmp(con->uri, "/rss/", 5) && !strchr(con->uri + 5, '/'))
2873 snprintf(filename, len, "%s/rss/%s", CacheDir, con->uri + 5);
2874 else if (!strncmp(con->uri, "/strings/", 9) && !strcmp(con->uri + strlen(con->uri) - 8, ".strings"))
2875 {
2876 strlcpy(dest, con->uri + 9, sizeof(dest));
2877 dest[strlen(dest) - 8] = '\0';
2878
2879 if ((p = cupsdFindDest(dest)) == NULL)
2880 {
2881 strlcpy(filename, "/", len);
2882 cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
2883 return (NULL);
2884 }
2885
2886 if (!p->strings)
2887 {
2888 strlcpy(filename, "/", len);
2889 cupsdLogClient(con, CUPSD_LOG_INFO, "No strings files for \"%s\".", dest);
2890 return (NULL);
2891 }
2892
2893 strlcpy(filename, p->strings, len);
2894
2895 perm_check = 0;
2896 }
2897 else if (con->language)
2898 {
2899 snprintf(language, sizeof(language), "/%s", con->language->language);
2900 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
2901 }
2902 else
2903 snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
2904
2905 if ((ptr = strchr(filename, '?')) != NULL)
2906 *ptr = '\0';
2907
2908 /*
2909 * Grab the status for this language; if there isn't a language-specific file
2910 * then fallback to the default one...
2911 */
2912
2913 if ((status = lstat(filename, filestats)) != 0 && language[0] &&
2914 strncmp(con->uri, "/icons/", 7) &&
2915 strncmp(con->uri, "/ppd/", 5) &&
2916 strncmp(con->uri, "/rss/", 5) &&
2917 strncmp(con->uri, "/strings/", 9) &&
2918 strncmp(con->uri, "/admin/conf/", 12) &&
2919 strncmp(con->uri, "/admin/log/", 11))
2920 {
2921 /*
2922 * Drop the country code...
2923 */
2924
2925 language[3] = '\0';
2926 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
2927
2928 if ((ptr = strchr(filename, '?')) != NULL)
2929 *ptr = '\0';
2930
2931 if ((status = lstat(filename, filestats)) != 0)
2932 {
2933 /*
2934 * Drop the language prefix and try the root directory...
2935 */
2936
2937 language[0] = '\0';
2938 snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
2939
2940 if ((ptr = strchr(filename, '?')) != NULL)
2941 *ptr = '\0';
2942
2943 status = lstat(filename, filestats);
2944 }
2945 }
2946
2947 /*
2948 * If we've found a symlink, 404 the sucker to avoid disclosing information.
2949 */
2950
2951 if (!status && S_ISLNK(filestats->st_mode))
2952 {
2953 cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
2954 return (NULL);
2955 }
2956
2957 /*
2958 * Similarly, if the file/directory does not have world read permissions, do
2959 * not allow access...
2960 */
2961
2962 if (!status && perm_check && !(filestats->st_mode & S_IROTH))
2963 {
2964 cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
2965 return (NULL);
2966 }
2967
2968 /*
2969 * If we've found a directory, get the index.html file instead...
2970 */
2971
2972 if (!status && S_ISDIR(filestats->st_mode))
2973 {
2974 /*
2975 * Make sure the URI ends with a slash...
2976 */
2977
2978 if (con->uri[strlen(con->uri) - 1] != '/')
2979 strlcat(con->uri, "/", sizeof(con->uri));
2980
2981 /*
2982 * Find the directory index file, trying every language...
2983 */
2984
2985 do
2986 {
2987 if (status && language[0])
2988 {
2989 /*
2990 * Try a different language subset...
2991 */
2992
2993 if (language[3])
2994 language[3] = '\0'; /* Strip country code */
2995 else
2996 language[0] = '\0'; /* Strip language */
2997 }
2998
2999 /*
3000 * Look for the index file...
3001 */
3002
3003 snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
3004
3005 if ((ptr = strchr(filename, '?')) != NULL)
3006 *ptr = '\0';
3007
3008 ptr = filename + strlen(filename);
3009 plen = len - (size_t)(ptr - filename);
3010
3011 strlcpy(ptr, "index.html", plen);
3012 status = lstat(filename, filestats);
3013 }
3014 while (status && language[0]);
3015
3016 /*
3017 * If we've found a symlink, 404 the sucker to avoid disclosing information.
3018 */
3019
3020 if (!status && S_ISLNK(filestats->st_mode))
3021 {
3022 cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
3023 return (NULL);
3024 }
3025
3026 /*
3027 * Similarly, if the file/directory does not have world read permissions, do
3028 * not allow access...
3029 */
3030
3031 if (!status && perm_check && !(filestats->st_mode & S_IROTH))
3032 {
3033 cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
3034 return (NULL);
3035 }
3036 }
3037
3038 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "get_file: filestats=%p, filename=%p, len=" CUPS_LLFMT ", returning \"%s\".", filestats, filename, CUPS_LLCAST len, status ? "(null)" : filename);
3039
3040 if (status)
3041 return (NULL);
3042 else
3043 return (filename);
3044 }
3045
3046
3047 /*
3048 * 'install_cupsd_conf()' - Install a configuration file.
3049 */
3050
3051 static http_status_t /* O - Status */
install_cupsd_conf(cupsd_client_t * con)3052 install_cupsd_conf(cupsd_client_t *con) /* I - Connection */
3053 {
3054 char filename[1024]; /* Configuration filename */
3055 cups_file_t *in, /* Input file */
3056 *out; /* Output file */
3057 char buffer[16384]; /* Copy buffer */
3058 ssize_t bytes; /* Number of bytes */
3059
3060
3061 /*
3062 * Open the request file...
3063 */
3064
3065 if ((in = cupsFileOpen(con->filename, "rb")) == NULL)
3066 {
3067 cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to open request file \"%s\": %s",
3068 con->filename, strerror(errno));
3069 goto server_error;
3070 }
3071
3072 /*
3073 * Open the new config file...
3074 */
3075
3076 if ((out = cupsdCreateConfFile(ConfigurationFile, ConfigFilePerm)) == NULL)
3077 {
3078 cupsFileClose(in);
3079 goto server_error;
3080 }
3081
3082 cupsdLogClient(con, CUPSD_LOG_INFO, "Installing config file \"%s\"...",
3083 ConfigurationFile);
3084
3085 /*
3086 * Copy from the request to the new config file...
3087 */
3088
3089 while ((bytes = cupsFileRead(in, buffer, sizeof(buffer))) > 0)
3090 if (cupsFileWrite(out, buffer, (size_t)bytes) < bytes)
3091 {
3092 cupsdLogClient(con, CUPSD_LOG_ERROR,
3093 "Unable to copy to config file \"%s\": %s",
3094 ConfigurationFile, strerror(errno));
3095
3096 cupsFileClose(in);
3097 cupsFileClose(out);
3098
3099 snprintf(filename, sizeof(filename), "%s.N", ConfigurationFile);
3100 cupsdUnlinkOrRemoveFile(filename);
3101
3102 goto server_error;
3103 }
3104
3105 /*
3106 * Close the files...
3107 */
3108
3109 cupsFileClose(in);
3110
3111 if (cupsdCloseCreatedConfFile(out, ConfigurationFile))
3112 goto server_error;
3113
3114 /*
3115 * Remove the request file...
3116 */
3117
3118 cupsdUnlinkOrRemoveFile(con->filename);
3119 cupsdClearString(&con->filename);
3120
3121 /*
3122 * Set the NeedReload flag...
3123 */
3124
3125 NeedReload = RELOAD_CUPSD;
3126 ReloadTime = time(NULL);
3127
3128 /*
3129 * Return that the file was created successfully...
3130 */
3131
3132 return (HTTP_STATUS_CREATED);
3133
3134 /*
3135 * Common exit for errors...
3136 */
3137
3138 server_error:
3139
3140 cupsdUnlinkOrRemoveFile(con->filename);
3141 cupsdClearString(&con->filename);
3142
3143 return (HTTP_STATUS_SERVER_ERROR);
3144 }
3145
3146
3147 /*
3148 * 'is_cgi()' - Is the resource a CGI script/program?
3149 */
3150
3151 static int /* O - 1 = CGI, 0 = file */
is_cgi(cupsd_client_t * con,const char * filename,struct stat * filestats,mime_type_t * type)3152 is_cgi(cupsd_client_t *con, /* I - Client connection */
3153 const char *filename, /* I - Real filename */
3154 struct stat *filestats, /* I - File information */
3155 mime_type_t *type) /* I - MIME type */
3156 {
3157 const char *options; /* Options on URL */
3158
3159
3160 /*
3161 * Get the options, if any...
3162 */
3163
3164 if ((options = strchr(con->uri, '?')) != NULL)
3165 {
3166 options ++;
3167 cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", options);
3168 }
3169
3170 /*
3171 * Check for known types...
3172 */
3173
3174 if (!type || _cups_strcasecmp(type->super, "application"))
3175 {
3176 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");
3177 return (0);
3178 }
3179
3180 if (!_cups_strcasecmp(type->type, "x-httpd-cgi") && (filestats->st_mode & 0111) && (getuid() || !(filestats->st_mode & 022)))
3181 {
3182 /*
3183 * "application/x-httpd-cgi" is a CGI script.
3184 */
3185
3186 cupsdSetString(&con->command, filename);
3187
3188 if (options)
3189 cupsdSetStringf(&con->options, " %s", options);
3190
3191 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 1.", filename, filestats, type->super, type->type);
3192 return (1);
3193 }
3194
3195 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 0.", filename, filestats, type->super, type->type);
3196 return (0);
3197 }
3198
3199
3200 /*
3201 * 'is_path_absolute()' - Is a path absolute and free of relative elements (i.e. "..").
3202 */
3203
3204 static int /* O - 0 if relative, 1 if absolute */
is_path_absolute(const char * path)3205 is_path_absolute(const char *path) /* I - Input path */
3206 {
3207 /*
3208 * Check for a leading slash...
3209 */
3210
3211 if (path[0] != '/')
3212 return (0);
3213
3214 /*
3215 * Check for "<" or quotes in the path and reject since this is probably
3216 * someone trying to inject HTML...
3217 */
3218
3219 if (strchr(path, '<') != NULL || strchr(path, '\"') != NULL || strchr(path, '\'') != NULL)
3220 return (0);
3221
3222 /*
3223 * Check for "/.." in the path...
3224 */
3225
3226 while ((path = strstr(path, "/..")) != NULL)
3227 {
3228 if (!path[3] || path[3] == '/')
3229 return (0);
3230
3231 path ++;
3232 }
3233
3234 /*
3235 * If we haven't found any relative paths, return 1 indicating an
3236 * absolute path...
3237 */
3238
3239 return (1);
3240 }
3241
3242
3243 /*
3244 * 'pipe_command()' - Pipe the output of a command to the remote client.
3245 */
3246
3247 static int /* O - Process ID */
pipe_command(cupsd_client_t * con,int infile,int * outfile,char * command,char * options,int root)3248 pipe_command(cupsd_client_t *con, /* I - Client connection */
3249 int infile, /* I - Standard input for command */
3250 int *outfile, /* O - Standard output for command */
3251 char *command, /* I - Command to run */
3252 char *options, /* I - Options for command */
3253 int root) /* I - Run as root? */
3254 {
3255 int i; /* Looping var */
3256 int pid; /* Process ID */
3257 char *commptr, /* Command string pointer */
3258 commch; /* Command string character */
3259 char *uriptr; /* URI string pointer */
3260 int fds[2]; /* Pipe FDs */
3261 int argc; /* Number of arguments */
3262 int envc; /* Number of environment variables */
3263 char argbuf[10240], /* Argument buffer */
3264 *argv[100], /* Argument strings */
3265 *envp[MAX_ENV + 20]; /* Environment variables */
3266 char auth_type[256], /* AUTH_TYPE environment variable */
3267 content_length[1024], /* CONTENT_LENGTH environment variable */
3268 content_type[1024], /* CONTENT_TYPE environment variable */
3269 http_cookie[32768], /* HTTP_COOKIE environment variable */
3270 http_referer[1024], /* HTTP_REFERER environment variable */
3271 http_user_agent[1024], /* HTTP_USER_AGENT environment variable */
3272 lang[1024], /* LANG environment variable */
3273 path_info[1024], /* PATH_INFO environment variable */
3274 remote_addr[1024], /* REMOTE_ADDR environment variable */
3275 remote_host[1024], /* REMOTE_HOST environment variable */
3276 remote_user[1024], /* REMOTE_USER environment variable */
3277 script_filename[1024], /* SCRIPT_FILENAME environment variable */
3278 script_name[1024], /* SCRIPT_NAME environment variable */
3279 server_name[1024], /* SERVER_NAME environment variable */
3280 server_port[1024]; /* SERVER_PORT environment variable */
3281 ipp_attribute_t *attr; /* attributes-natural-language attribute */
3282
3283
3284 /*
3285 * Parse a copy of the options string, which is of the form:
3286 *
3287 * argument+argument+argument
3288 * ?argument+argument+argument
3289 * param=value¶m=value
3290 * ?param=value¶m=value
3291 * /name?argument+argument+argument
3292 * /name?param=value¶m=value
3293 *
3294 * If the string contains an "=" character after the initial name,
3295 * then we treat it as a HTTP GET form request and make a copy of
3296 * the remaining string for the environment variable.
3297 *
3298 * The string is always parsed out as command-line arguments, to
3299 * be consistent with Apache...
3300 */
3301
3302 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "pipe_command: infile=%d, outfile=%p, command=\"%s\", options=\"%s\", root=%d", infile, outfile, command, options ? options : "(null)", root);
3303
3304 argv[0] = command;
3305
3306 if (options)
3307 strlcpy(argbuf, options, sizeof(argbuf));
3308 else
3309 argbuf[0] = '\0';
3310
3311 if (argbuf[0] == '/')
3312 {
3313 /*
3314 * Found some trailing path information, set PATH_INFO...
3315 */
3316
3317 if ((commptr = strchr(argbuf, '?')) == NULL)
3318 commptr = argbuf + strlen(argbuf);
3319
3320 commch = *commptr;
3321 *commptr = '\0';
3322 snprintf(path_info, sizeof(path_info), "PATH_INFO=%s", argbuf);
3323 *commptr = commch;
3324 }
3325 else
3326 {
3327 commptr = argbuf;
3328 path_info[0] = '\0';
3329
3330 if (*commptr == ' ')
3331 commptr ++;
3332 }
3333
3334 if (*commptr == '?' && con->operation == HTTP_STATE_GET && !con->query_string)
3335 {
3336 commptr ++;
3337 cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", commptr);
3338 }
3339
3340 argc = 1;
3341
3342 if (*commptr)
3343 {
3344 argv[argc ++] = commptr;
3345
3346 for (; *commptr && argc < 99; commptr ++)
3347 {
3348 /*
3349 * Break arguments whenever we see a + or space...
3350 */
3351
3352 if (*commptr == ' ' || *commptr == '+')
3353 {
3354 while (*commptr == ' ' || *commptr == '+')
3355 *commptr++ = '\0';
3356
3357 /*
3358 * If we don't have a blank string, save it as another argument...
3359 */
3360
3361 if (*commptr)
3362 {
3363 argv[argc] = commptr;
3364 argc ++;
3365 }
3366 else
3367 break;
3368 }
3369 else if (*commptr == '%' && isxdigit(commptr[1] & 255) &&
3370 isxdigit(commptr[2] & 255))
3371 {
3372 /*
3373 * Convert the %xx notation to the individual character.
3374 */
3375
3376 if (commptr[1] >= '0' && commptr[1] <= '9')
3377 *commptr = (char)((commptr[1] - '0') << 4);
3378 else
3379 *commptr = (char)((tolower(commptr[1]) - 'a' + 10) << 4);
3380
3381 if (commptr[2] >= '0' && commptr[2] <= '9')
3382 *commptr |= commptr[2] - '0';
3383 else
3384 *commptr |= tolower(commptr[2]) - 'a' + 10;
3385
3386 _cups_strcpy(commptr + 1, commptr + 3);
3387
3388 /*
3389 * Check for a %00 and break if that is the case...
3390 */
3391
3392 if (!*commptr)
3393 break;
3394 }
3395 }
3396 }
3397
3398 argv[argc] = NULL;
3399
3400 /*
3401 * Setup the environment variables as needed...
3402 */
3403
3404 if (con->username[0])
3405 {
3406 snprintf(auth_type, sizeof(auth_type), "AUTH_TYPE=%s",
3407 httpGetField(con->http, HTTP_FIELD_AUTHORIZATION));
3408
3409 if ((uriptr = strchr(auth_type + 10, ' ')) != NULL)
3410 *uriptr = '\0';
3411 }
3412 else
3413 auth_type[0] = '\0';
3414
3415 if (con->request && (attr = ippFindAttribute(con->request, "attributes-natural-language", IPP_TAG_LANGUAGE)) != NULL)
3416 {
3417 cups_lang_t *language = cupsLangGet(ippGetString(attr, 0, NULL));
3418
3419 snprintf(lang, sizeof(lang), "LANG=%s.UTF8", language->language);
3420 cupsLangFree(language);
3421 }
3422 else if (con->language)
3423 snprintf(lang, sizeof(lang), "LANG=%s.UTF8", con->language->language);
3424 else
3425 strlcpy(lang, "LANG=C", sizeof(lang));
3426
3427 strlcpy(remote_addr, "REMOTE_ADDR=", sizeof(remote_addr));
3428 httpAddrString(httpGetAddress(con->http), remote_addr + 12,
3429 sizeof(remote_addr) - 12);
3430
3431 snprintf(remote_host, sizeof(remote_host), "REMOTE_HOST=%s",
3432 httpGetHostname(con->http, NULL, 0));
3433
3434 snprintf(script_name, sizeof(script_name), "SCRIPT_NAME=%s", con->uri);
3435 if ((uriptr = strchr(script_name, '?')) != NULL)
3436 *uriptr = '\0';
3437
3438 snprintf(script_filename, sizeof(script_filename), "SCRIPT_FILENAME=%s%s",
3439 DocumentRoot, script_name + 12);
3440
3441 snprintf(server_port, sizeof(server_port), "SERVER_PORT=%d", con->serverport);
3442
3443 if (httpGetField(con->http, HTTP_FIELD_HOST)[0])
3444 {
3445 char *nameptr; /* Pointer to ":port" */
3446
3447 snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
3448 httpGetField(con->http, HTTP_FIELD_HOST));
3449 if ((nameptr = strrchr(server_name, ':')) != NULL && !strchr(nameptr, ']'))
3450 *nameptr = '\0'; /* Strip trailing ":port" */
3451 }
3452 else
3453 snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
3454 con->servername);
3455
3456 envc = cupsdLoadEnv(envp, (int)(sizeof(envp) / sizeof(envp[0])));
3457
3458 if (auth_type[0])
3459 envp[envc ++] = auth_type;
3460
3461 envp[envc ++] = lang;
3462 envp[envc ++] = "REDIRECT_STATUS=1";
3463 envp[envc ++] = "GATEWAY_INTERFACE=CGI/1.1";
3464 envp[envc ++] = server_name;
3465 envp[envc ++] = server_port;
3466 envp[envc ++] = remote_addr;
3467 envp[envc ++] = remote_host;
3468 envp[envc ++] = script_name;
3469 envp[envc ++] = script_filename;
3470
3471 if (path_info[0])
3472 envp[envc ++] = path_info;
3473
3474 if (con->username[0])
3475 {
3476 snprintf(remote_user, sizeof(remote_user), "REMOTE_USER=%s", con->username);
3477
3478 envp[envc ++] = remote_user;
3479 }
3480
3481 if (httpGetVersion(con->http) == HTTP_VERSION_1_1)
3482 envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.1";
3483 else if (httpGetVersion(con->http) == HTTP_VERSION_1_0)
3484 envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.0";
3485 else
3486 envp[envc ++] = "SERVER_PROTOCOL=HTTP/0.9";
3487
3488 if (httpGetCookie(con->http))
3489 {
3490 snprintf(http_cookie, sizeof(http_cookie), "HTTP_COOKIE=%s",
3491 httpGetCookie(con->http));
3492 envp[envc ++] = http_cookie;
3493 }
3494
3495 if (httpGetField(con->http, HTTP_FIELD_USER_AGENT)[0])
3496 {
3497 snprintf(http_user_agent, sizeof(http_user_agent), "HTTP_USER_AGENT=%s",
3498 httpGetField(con->http, HTTP_FIELD_USER_AGENT));
3499 envp[envc ++] = http_user_agent;
3500 }
3501
3502 if (httpGetField(con->http, HTTP_FIELD_REFERER)[0])
3503 {
3504 snprintf(http_referer, sizeof(http_referer), "HTTP_REFERER=%s",
3505 httpGetField(con->http, HTTP_FIELD_REFERER));
3506 envp[envc ++] = http_referer;
3507 }
3508
3509 if (con->operation == HTTP_STATE_GET)
3510 {
3511 envp[envc ++] = "REQUEST_METHOD=GET";
3512
3513 if (con->query_string)
3514 {
3515 /*
3516 * Add GET form variables after ?...
3517 */
3518
3519 envp[envc ++] = con->query_string;
3520 }
3521 else
3522 envp[envc ++] = "QUERY_STRING=";
3523 }
3524 else
3525 {
3526 snprintf(content_length, sizeof(content_length), "CONTENT_LENGTH=" CUPS_LLFMT, CUPS_LLCAST con->bytes);
3527 snprintf(content_type, sizeof(content_type), "CONTENT_TYPE=%s",
3528 httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE));
3529
3530 envp[envc ++] = "REQUEST_METHOD=POST";
3531 envp[envc ++] = content_length;
3532 envp[envc ++] = content_type;
3533 }
3534
3535 /*
3536 * Tell the CGI if we are using encryption...
3537 */
3538
3539 if (httpIsEncrypted(con->http))
3540 envp[envc ++] = "HTTPS=ON";
3541
3542 /*
3543 * Terminate the environment array...
3544 */
3545
3546 envp[envc] = NULL;
3547
3548 if (LogLevel >= CUPSD_LOG_DEBUG)
3549 {
3550 for (i = 0; i < argc; i ++)
3551 cupsdLogMessage(CUPSD_LOG_DEBUG,
3552 "[CGI] argv[%d] = \"%s\"", i, argv[i]);
3553 for (i = 0; i < envc; i ++)
3554 cupsdLogMessage(CUPSD_LOG_DEBUG,
3555 "[CGI] envp[%d] = \"%s\"", i, envp[i]);
3556 }
3557
3558 /*
3559 * Create a pipe for the output...
3560 */
3561
3562 if (cupsdOpenPipe(fds))
3563 {
3564 cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to create pipe for %s - %s",
3565 argv[0], strerror(errno));
3566 return (0);
3567 }
3568
3569 /*
3570 * Then execute the command...
3571 */
3572
3573 if (cupsdStartProcess(command, argv, envp, infile, fds[1], CGIPipes[1],
3574 -1, -1, root, DefaultProfile, NULL, &pid) < 0)
3575 {
3576 /*
3577 * Error - can't fork!
3578 */
3579
3580 cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to start %s - %s", argv[0],
3581 strerror(errno));
3582
3583 cupsdClosePipe(fds);
3584 pid = 0;
3585 }
3586 else
3587 {
3588 /*
3589 * Fork successful - return the PID...
3590 */
3591
3592 if (con->username[0])
3593 cupsdAddCert(pid, con->username, con->type);
3594
3595 cupsdLogMessage(CUPSD_LOG_DEBUG, "[CGI] Started %s (PID %d)", command, pid);
3596
3597 *outfile = fds[0];
3598 close(fds[1]);
3599 }
3600
3601 return (pid);
3602 }
3603
3604
3605 /*
3606 * 'valid_host()' - Is the Host: field valid?
3607 */
3608
3609 static int /* O - 1 if valid, 0 if not */
valid_host(cupsd_client_t * con)3610 valid_host(cupsd_client_t *con) /* I - Client connection */
3611 {
3612 cupsd_alias_t *a; /* Current alias */
3613 cupsd_netif_t *netif; /* Current network interface */
3614 const char *end; /* End character */
3615 char *ptr; /* Pointer into host value */
3616
3617
3618 /*
3619 * Copy the Host: header for later use...
3620 */
3621
3622 strlcpy(con->clientname, httpGetField(con->http, HTTP_FIELD_HOST),
3623 sizeof(con->clientname));
3624 if ((ptr = strrchr(con->clientname, ':')) != NULL && !strchr(ptr, ']'))
3625 {
3626 *ptr++ = '\0';
3627 con->clientport = atoi(ptr);
3628 }
3629 else
3630 con->clientport = con->serverport;
3631
3632 /*
3633 * Then validate...
3634 */
3635
3636 if (httpAddrLocalhost(httpGetAddress(con->http)))
3637 {
3638 /*
3639 * Only allow "localhost" or the equivalent IPv4 or IPv6 numerical
3640 * addresses when accessing CUPS via the loopback interface...
3641 */
3642
3643 return (!_cups_strcasecmp(con->clientname, "localhost") ||
3644 !_cups_strcasecmp(con->clientname, "localhost.") ||
3645 !strcmp(con->clientname, "127.0.0.1") ||
3646 !strcmp(con->clientname, "[::1]"));
3647 }
3648
3649 #ifdef HAVE_DNSSD
3650 /*
3651 * Check if the hostname is something.local (Bonjour); if so, allow it.
3652 */
3653
3654 if ((end = strrchr(con->clientname, '.')) != NULL && end > con->clientname &&
3655 !end[1])
3656 {
3657 /*
3658 * "." on end, work back to second-to-last "."...
3659 */
3660
3661 for (end --; end > con->clientname && *end != '.'; end --);
3662 }
3663
3664 if (end && (!_cups_strcasecmp(end, ".local") ||
3665 !_cups_strcasecmp(end, ".local.")))
3666 return (1);
3667 #endif /* HAVE_DNSSD */
3668
3669 /*
3670 * Check if the hostname is an IP address...
3671 */
3672
3673 if (isdigit(con->clientname[0] & 255) || con->clientname[0] == '[')
3674 {
3675 /*
3676 * Possible IPv4/IPv6 address...
3677 */
3678
3679 http_addrlist_t *addrlist; /* List of addresses */
3680
3681
3682 if ((addrlist = httpAddrGetList(con->clientname, AF_UNSPEC, NULL)) != NULL)
3683 {
3684 /*
3685 * Good IPv4/IPv6 address...
3686 */
3687
3688 httpAddrFreeList(addrlist);
3689 return (1);
3690 }
3691 }
3692
3693 /*
3694 * Check for (alias) name matches...
3695 */
3696
3697 for (a = (cupsd_alias_t *)cupsArrayFirst(ServerAlias);
3698 a;
3699 a = (cupsd_alias_t *)cupsArrayNext(ServerAlias))
3700 {
3701 /*
3702 * "ServerAlias *" allows all host values through...
3703 */
3704
3705 if (!strcmp(a->name, "*"))
3706 return (1);
3707
3708 if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
3709 {
3710 /*
3711 * Prefix matches; check the character at the end - it must be "." or nul.
3712 */
3713
3714 end = con->clientname + a->namelen;
3715
3716 if (!*end || (*end == '.' && !end[1]))
3717 return (1);
3718 }
3719 }
3720
3721 #ifdef HAVE_DNSSD
3722 for (a = (cupsd_alias_t *)cupsArrayFirst(DNSSDAlias);
3723 a;
3724 a = (cupsd_alias_t *)cupsArrayNext(DNSSDAlias))
3725 {
3726 /*
3727 * "ServerAlias *" allows all host values through...
3728 */
3729
3730 if (!strcmp(a->name, "*"))
3731 return (1);
3732
3733 if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
3734 {
3735 /*
3736 * Prefix matches; check the character at the end - it must be "." or nul.
3737 */
3738
3739 end = con->clientname + a->namelen;
3740
3741 if (!*end || (*end == '.' && !end[1]))
3742 return (1);
3743 }
3744 }
3745 #endif /* HAVE_DNSSD */
3746
3747 /*
3748 * Check for interface hostname matches...
3749 */
3750
3751 for (netif = (cupsd_netif_t *)cupsArrayFirst(NetIFList);
3752 netif;
3753 netif = (cupsd_netif_t *)cupsArrayNext(NetIFList))
3754 {
3755 if (!_cups_strncasecmp(con->clientname, netif->hostname, netif->hostlen))
3756 {
3757 /*
3758 * Prefix matches; check the character at the end - it must be "." or nul.
3759 */
3760
3761 end = con->clientname + netif->hostlen;
3762
3763 if (!*end || (*end == '.' && !end[1]))
3764 return (1);
3765 }
3766 }
3767
3768 return (0);
3769 }
3770
3771
3772 /*
3773 * 'write_file()' - Send a file via HTTP.
3774 */
3775
3776 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)3777 write_file(cupsd_client_t *con, /* I - Client connection */
3778 http_status_t code, /* I - HTTP status */
3779 char *filename, /* I - Filename */
3780 char *type, /* I - File type */
3781 struct stat *filestats) /* O - File information */
3782 {
3783 con->file = open(filename, O_RDONLY);
3784
3785 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_file: code=%d, filename=\"%s\" (%d), type=\"%s\", filestats=%p.", code, filename, con->file, type ? type : "(null)", filestats);
3786
3787 if (con->file < 0)
3788 return (0);
3789
3790 fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
3791
3792 con->pipe_pid = 0;
3793 con->sent_header = 1;
3794
3795 httpClearFields(con->http);
3796
3797 httpSetLength(con->http, (size_t)filestats->st_size);
3798
3799 httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED,
3800 httpGetDateString(filestats->st_mtime));
3801
3802 if (!cupsdSendHeader(con, code, type, CUPSD_AUTH_NONE))
3803 return (0);
3804
3805 cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
3806
3807 cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending file.");
3808
3809 return (1);
3810 }
3811
3812
3813 /*
3814 * 'write_pipe()' - Flag that data is available on the CGI pipe.
3815 */
3816
3817 static void
write_pipe(cupsd_client_t * con)3818 write_pipe(cupsd_client_t *con) /* I - Client connection */
3819 {
3820 cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_pipe: CGI output on fd %d.", con->file);
3821
3822 con->file_ready = 1;
3823
3824 cupsdRemoveSelect(con->file);
3825 cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
3826
3827 cupsdLogClient(con, CUPSD_LOG_DEBUG, "CGI data ready to be sent.");
3828 }
3829
