-
Notifications
You must be signed in to change notification settings - Fork 143
/
httpd.c
4967 lines (4075 loc) · 156 KB
/
httpd.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* httpd.c -- HTTP/WebDAV/CalDAV server protocol parsing
*
* Copyright (c) 1994-2011 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <config.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/param.h>
#include <syslog.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include "prot.h"
#include <sasl/sasl.h>
#include <sasl/saslutil.h>
#include "httpd.h"
#include "http_proxy.h"
#include "acl.h"
#include "assert.h"
#include "util.h"
#include "iptostring.h"
#include "global.h"
#include "tls.h"
#include "map.h"
#include "exitcodes.h"
#include "imapd.h"
#include "proc.h"
#include "version.h"
#include "xstrlcpy.h"
#include "xstrlcat.h"
#include "telemetry.h"
#include "backend.h"
#include "prometheus.h"
#include "proxy.h"
#include "userdeny.h"
#include "message.h"
#include "idle.h"
#include "times.h"
#include "tok.h"
#include "wildmat.h"
#include "md5.h"
/* generated headers are not necessarily in current directory */
#include "imap/http_err.h"
#ifdef WITH_DAV
#include "http_dav.h"
#endif
#include <libxml/tree.h>
#include <libxml/HTMLtree.h>
#include <libxml/uri.h>
#define COMPRESS_START (1<<0)
#define COMPRESS_END (1<<1)
static unsigned accept_encodings = 0;
#ifdef HAVE_ZLIB
#include <zlib.h>
static z_stream *zlib_init()
{
z_stream *zstrm = xzmalloc(sizeof(z_stream));
/* Always use gzip format because IE incorrectly uses raw deflate */
if (deflateInit2(zstrm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
16+MAX_WBITS /* gzip */,
MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY) != Z_OK) {
free(zstrm);
return NULL;
}
else {
accept_encodings |= CE_DEFLATE | CE_GZIP;
return zstrm;
}
}
static void zlib_compress(struct transaction_t *txn, unsigned flags,
const char *buf, unsigned len)
{
/* Only flush for static content or on last (zero-length) chunk */
unsigned flush = (flags & COMPRESS_END) ? Z_FINISH : Z_NO_FLUSH;
z_stream *zstrm = txn->conn->zstrm;
if (flags & COMPRESS_START) deflateReset(zstrm);
zstrm->next_in = (Bytef *) buf;
zstrm->avail_in = len;
buf_ensure(&txn->zbuf, deflateBound(zstrm, zstrm->avail_in));
buf_reset(&txn->zbuf);
do {
int zr;
if (!zstrm->avail_out) {
unsigned pending;
zr = deflatePending(zstrm, &pending, Z_NULL);
if (zr != Z_OK) {
/* something went wrong */
syslog(LOG_ERR, "zlib deflate error: %d %s", zr, zstrm->msg);
fatal("zlib: Error while compressing data", EC_SOFTWARE);
}
buf_ensure(&txn->zbuf, pending);
}
zstrm->next_out = (Bytef *) txn->zbuf.s + txn->zbuf.len;
zstrm->avail_out = txn->zbuf.alloc - txn->zbuf.len;
zr = deflate(zstrm, flush);
if (!(zr == Z_OK || zr == Z_STREAM_END || zr == Z_BUF_ERROR)) {
/* something went wrong */
syslog(LOG_ERR, "zlib deflate error: %d %s", zr, zstrm->msg);
fatal("zlib: Error while compressing data", EC_SOFTWARE);
}
txn->zbuf.len = txn->zbuf.alloc - zstrm->avail_out;
} while (!zstrm->avail_out);
}
static void zlib_done(z_stream *zstrm)
{
if (zstrm) {
deflateEnd(zstrm);
free(zstrm);
}
}
#else /* !HAVE_ZLIB */
static void *zlib_init() { return NULL; }
static void zlib_compress(struct transaction_t *txn __attribute__((unused)),
unsigned flags __attribute__((unused)),
const char *buf __attribute__((unused)),
unsigned len __attribute__((unused)))
{
fatal("Compression requested, but no zlib", EC_SOFTWARE);
}
static void zlib_done(void *zstrm __attribute__((unused))) { }
#endif /* HAVE_ZLIB */
#ifdef HAVE_BROTLI
#include <brotli/encode.h>
static BrotliEncoderState *brotli_init()
{
BrotliEncoderState *brotli = BrotliEncoderCreateInstance(NULL, NULL, NULL);
if (brotli) {
BrotliEncoderSetParameter(brotli, BROTLI_PARAM_MODE,
BROTLI_DEFAULT_MODE);
BrotliEncoderSetParameter(brotli, BROTLI_PARAM_QUALITY,
BROTLI_DEFAULT_QUALITY);
BrotliEncoderSetParameter(brotli, BROTLI_PARAM_LGWIN,
BROTLI_DEFAULT_WINDOW);
BrotliEncoderSetParameter(brotli, BROTLI_PARAM_LGBLOCK, 0);
}
return brotli;
}
static void brotli_compress(struct transaction_t *txn,
unsigned flags, const char *buf, unsigned len)
{
/* Only flush for static content or on last (zero-length) chunk */
unsigned op = (flags & COMPRESS_END) ?
BROTLI_OPERATION_FINISH : BROTLI_OPERATION_FLUSH;
BrotliEncoderState *brotli = txn->conn->brotli;
const uint8_t *next_in = (const uint8_t *) buf;
size_t avail_in = (size_t) len;
buf_ensure(&txn->zbuf, BrotliEncoderMaxCompressedSize(avail_in));
buf_reset(&txn->zbuf);
do {
uint8_t *next_out = (uint8_t *) txn->zbuf.s + txn->zbuf.len;
size_t avail_out = txn->zbuf.alloc - txn->zbuf.len;
if (!BrotliEncoderCompressStream(brotli, op,
&avail_in, &next_in,
&avail_out, &next_out, NULL)) {
fatal("Brotli: Error while compressing data", EC_SOFTWARE);
}
txn->zbuf.len = txn->zbuf.alloc - avail_out;
} while (avail_in || BrotliEncoderHasMoreOutput(brotli));
if (BrotliEncoderIsFinished(brotli)) {
BrotliEncoderDestroyInstance(brotli);
txn->conn->brotli = brotli_init();
}
}
static void brotli_done(BrotliEncoderState *brotli)
{
if (brotli) BrotliEncoderDestroyInstance(brotli);
}
#else /* !HAVE_BROTLI */
static void *brotli_init() { return NULL; }
static void brotli_compress(struct transaction_t *txn __attribute__((unused)),
unsigned flags __attribute__((unused)),
const char *buf __attribute__((unused)),
unsigned len __attribute__((unused)))
{
fatal("Brotli Compression requested, but not available", EC_SOFTWARE);
}
static void brotli_done(void *brotli __attribute__((unused))) {}
#endif /* HAVE_BROTLI */
static const char tls_message[] =
HTML_DOCTYPE
"<html>\n<head>\n<title>TLS Required</title>\n</head>\n" \
"<body>\n<h2>TLS is required prior to authentication</h2>\n" \
"Use <a href=\"%s\">%s</a> instead.\n" \
"</body>\n</html>\n";
extern int optind;
extern char *optarg;
extern int opterr;
#ifdef HAVE_SSL
static SSL *tls_conn;
#endif /* HAVE_SSL */
sasl_conn_t *httpd_saslconn; /* the sasl connection context */
static struct wildmat *allow_cors = NULL;
int httpd_timeout, httpd_keepalive;
char *httpd_userid = NULL;
char *httpd_extrafolder = NULL;
char *httpd_extradomain = NULL;
struct auth_state *httpd_authstate = 0;
int httpd_userisadmin = 0;
int httpd_userisproxyadmin = 0;
int httpd_userisanonymous = 1;
static const char *httpd_clienthost = "[local]";
const char *httpd_localip = NULL, *httpd_remoteip = NULL;
struct protstream *httpd_out = NULL;
struct protstream *httpd_in = NULL;
struct protgroup *protin = NULL;
static int httpd_logfd = -1;
static sasl_ssf_t extprops_ssf = 0;
int https = 0;
int httpd_tls_done = 0;
int httpd_tls_required = 0;
unsigned avail_auth_schemes = 0; /* bitmask of available auth schemes */
unsigned long config_httpmodules;
int config_httpprettytelemetry;
static time_t compile_time;
struct buf serverinfo = BUF_INITIALIZER;
int ignorequota = 0;
int apns_enabled = 0;
#ifdef HAVE_NGHTTP2
static nghttp2_session_callbacks *http2_callbacks = NULL;
#ifdef HAVE_TLS_ALPN
static int alpn_select_cb(SSL *ssl __attribute__((unused)),
const unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen,
void *arg)
{
int *is_h2 = (int *) arg;
if (nghttp2_select_next_protocol((u_char **) out, outlen, in, inlen) == 1) {
*is_h2 = 1;
return SSL_TLSEXT_ERR_OK;
}
return SSL_TLSEXT_ERR_NOACK;
}
#endif /* HAVE_TLS_ALPN */
static ssize_t http2_send_cb(nghttp2_session *session __attribute__((unused)),
const uint8_t *data, size_t length,
int flags __attribute__((unused)),
void *user_data)
{
struct http_connection *conn = (struct http_connection *) user_data;
struct protstream *pout = conn->pout;
int r;
r = prot_write(pout, (const char *) data, length);
syslog(LOG_DEBUG, "http2_send_cb(%zu): %d", length, r);
if (r) return NGHTTP2_ERR_CALLBACK_FAILURE;
return length;
}
static ssize_t http2_recv_cb(nghttp2_session *session __attribute__((unused)),
uint8_t *buf, size_t length,
int flags __attribute__((unused)),
void *user_data)
{
struct http_connection *conn = (struct http_connection *) user_data;
struct protstream *pin = conn->pin;
ssize_t n;
n = prot_read(pin, (char *) buf, length);
if (n) {
/* We received some data - don't block next time
Note: This callback gets called multiple times until it
would block. We don't actually want to block and prevent
output from being submitted */
prot_NONBLOCK(pin);
}
else {
/* No data - block next time (for client timeout) */
prot_BLOCK(pin);
if (pin->eof) n = NGHTTP2_ERR_EOF;
else if (pin->error) n = NGHTTP2_ERR_CALLBACK_FAILURE;
else n = NGHTTP2_ERR_WOULDBLOCK;
}
syslog(LOG_DEBUG,
"http2_recv_cb(%zu): n = %zd, eof = %d, err = '%s', errno = %d",
length, n, pin->eof, pin->error ? pin->error : "", errno);
return n;
}
static ssize_t http2_data_source_read_cb(nghttp2_session *session __attribute__((unused)),
int32_t stream_id,
uint8_t *buf, size_t length,
uint32_t *data_flags,
nghttp2_data_source *source,
void *user_data __attribute__((unused)))
{
struct protstream *s = source->ptr;
size_t n = prot_read(s, (char *) buf, length);
syslog(LOG_DEBUG,
"http2_data_source_read_cb(id=%d, len=%zu): n=%zu, eof=%d",
stream_id, length, n, !s->cnt);
if (!s->cnt) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
prot_free(s); /* Done with the protstream */
}
return n;
}
static int http2_begin_headers_cb(nghttp2_session *session,
const nghttp2_frame *frame, void *user_data)
{
if (frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
syslog(LOG_DEBUG, "http2_begin_headers_cb(id=%d, type=%d)",
frame->hd.stream_id, frame->hd.type);
struct transaction_t *txn = xzmalloc(sizeof(struct transaction_t));
txn->conn = (struct http_connection *) user_data;
txn->http2.stream_id = frame->hd.stream_id;
txn->meth = METH_UNKNOWN;
txn->flags.ver = VER_2;
txn->flags.vary = VARY_AE;
txn->req_line.ver = HTTP2_VERSION;
/* Create header cache */
if (!(txn->req_hdrs = spool_new_hdrcache())) {
syslog(LOG_ERR, "Unable to create header cache");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
nghttp2_session_set_stream_user_data(session, frame->hd.stream_id, txn);
return 0;
}
static int http2_header_cb(nghttp2_session *session,
const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags __attribute__((unused)),
void *user_data __attribute__((unused)))
{
if (frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
return 0;
}
char *my_name, *my_value;
struct transaction_t *txn =
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
if (!txn) return 0;
my_name = xstrndup((const char *) name, namelen);
my_value = xstrndup((const char *) value, valuelen);
syslog(LOG_DEBUG, "http2_header_cb(%s: %s)", my_name, my_value);
if (my_name[0] == ':') {
switch (my_name[1]) {
case 'm': /* :method */
if (!strcmp("ethod", my_name+2)) txn->req_line.meth = my_value;
break;
case 's': /* :scheme */
break;
case 'a': /* :authority */
break;
case 'p': /* :path */
if (!strcmp("ath", my_name+2)) txn->req_line.uri = my_value;
break;
}
}
spool_cache_header(my_name, my_value, txn->req_hdrs);
return 0;
}
static int http2_data_chunk_recv_cb(nghttp2_session *session,
uint8_t flags __attribute__((unused)),
int32_t stream_id,
const uint8_t *data, size_t len,
void *user_data __attribute__((unused)))
{
struct transaction_t *txn =
nghttp2_session_get_stream_user_data(session, stream_id);
if (!txn) return 0;
syslog(LOG_DEBUG, "http2_data_chunk_recv_cb(id=%d, len=%zu, txnflags=%#x)",
stream_id, len, txn->req_body.flags);
if (txn->req_body.flags & BODY_DISCARD) return 0;
if (len) {
txn->req_body.framing = FRAMING_HTTP2;
txn->req_body.len += len;
buf_appendmap(&txn->req_body.payload, (const char *) data, len);
}
return 0;
}
static int examine_request(struct transaction_t *txn);
static int client_need_auth(struct transaction_t *txn, int sasl_result);
static void transaction_free(struct transaction_t *txn);
static int http2_frame_recv_cb(nghttp2_session *session,
const nghttp2_frame *frame,
void *user_data __attribute__((unused)))
{
int ret = 0;
struct transaction_t *txn =
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
if (!txn) return 0;
syslog(LOG_DEBUG, "http2_frame_recv_cb(id=%d, type=%d, flags=%#x",
frame->hd.stream_id, frame->hd.type, frame->hd.flags);
switch (frame->hd.type) {
case NGHTTP2_HEADERS:
if (frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
/* Examine request */
ret = examine_request(txn);
if (ret) {
txn->req_body.flags |= BODY_DISCARD;
error_response(ret, txn);
break;
}
if (txn->req_body.flags & BODY_CONTINUE) {
txn->req_body.flags &= ~BODY_CONTINUE;
response_header(HTTP_CONTINUE, txn);
break;
}
}
GCC_FALLTHROUGH
case NGHTTP2_DATA:
/* Check that the client request has finished */
if (!(frame->hd.flags & NGHTTP2_FLAG_END_STREAM)) break;
/* Check that we still want to process the request */
if (txn->req_body.flags & BODY_DISCARD) break;
/* Process the requested method */
if (txn->req_tgt.namespace->premethod) {
ret = txn->req_tgt.namespace->premethod(txn);
}
if (!ret) {
const struct method_t *meth_t =
&txn->req_tgt.namespace->methods[txn->meth];
ret = (*meth_t->proc)(txn, meth_t->params);
prometheus_increment(prometheus_lookup_label(http_methods[txn->meth].metric,
txn->req_tgt.namespace->name));
}
if (ret == HTTP_UNAUTHORIZED) {
/* User must authenticate */
ret = client_need_auth(txn, 0);
}
/* Handle errors (success responses handled by method functions) */
if (ret) error_response(ret, txn);
if (txn->flags.conn & CONN_CLOSE) {
syslog(LOG_DEBUG, "nghttp2_submit_goaway()");
nghttp2_submit_goaway(session, NGHTTP2_FLAG_NONE,
nghttp2_session_get_last_proc_stream_id(
txn->conn->http2_session),
NGHTTP2_NO_ERROR, NULL, 0);
}
break;
}
return 0;
}
static int http2_stream_close_cb(nghttp2_session *session, int32_t stream_id,
uint32_t error_code __attribute__((unused)),
void *user_data __attribute__((unused)))
{
struct transaction_t *txn =
nghttp2_session_get_stream_user_data(session, stream_id);
syslog(LOG_DEBUG, "http2_stream_close_cb(id=%d)", stream_id);
if (txn) {
/* Memory cleanup */
transaction_free(txn);
free(txn);
}
return 0;
}
static int http2_frame_not_send_cb(nghttp2_session *session,
const nghttp2_frame *frame,
int lib_error_code,
void *user_data __attribute__((unused)))
{
syslog(LOG_DEBUG, "http2_frame_not_send_cb(id=%d)", frame->hd.stream_id);
/* Issue RST_STREAM so that stream does not hang around. */
nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
frame->hd.stream_id, lib_error_code);
return 0;
}
static void http2_init(struct buf *serverinfo)
{
int r;
buf_printf(serverinfo, " Nghttp2/%s", NGHTTP2_VERSION);
/* Setup HTTP/2 callbacks */
if ((r = nghttp2_session_callbacks_new(&http2_callbacks))) {
syslog(LOG_WARNING,
"nghttp2_session_callbacks_new: %s", nghttp2_strerror(r));
}
else {
nghttp2_session_callbacks_set_send_callback(http2_callbacks,
&http2_send_cb);
nghttp2_session_callbacks_set_recv_callback(http2_callbacks,
&http2_recv_cb);
nghttp2_session_callbacks_set_on_begin_headers_callback(http2_callbacks,
&http2_begin_headers_cb);
nghttp2_session_callbacks_set_on_header_callback(http2_callbacks,
http2_header_cb);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(http2_callbacks,
http2_data_chunk_recv_cb);
nghttp2_session_callbacks_set_on_frame_recv_callback(http2_callbacks,
http2_frame_recv_cb);
nghttp2_session_callbacks_set_on_stream_close_callback(http2_callbacks,
&http2_stream_close_cb);
nghttp2_session_callbacks_set_on_frame_not_send_callback(http2_callbacks,
&http2_frame_not_send_cb);
}
}
static void http2_done()
{
nghttp2_session_callbacks_del(http2_callbacks);
}
static int http2_preface(struct transaction_t *txn)
{
if (http2_callbacks) {
struct protstream *pin = txn->conn->pin;
/* Force read of initial client input and check for HTTP/2 preface */
prot_ungetc(prot_getc(pin), pin);
if (!strncmp(NGHTTP2_CLIENT_MAGIC, (const char *) pin->ptr, pin->cnt)) {
syslog(LOG_DEBUG, "HTTP/2 client connection preface");
return 1;
}
}
return 0;
}
static int http2_start(struct http_connection *conn, struct transaction_t *txn)
{
nghttp2_settings_entry iv = { NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 };
int r;
r = nghttp2_session_server_new2(&conn->http2_session,
http2_callbacks, conn, conn->http2_options);
if (r) {
syslog(LOG_WARNING,
"nghttp2_session_server_new: %s", nghttp2_strerror(r));
return HTTP_SERVER_ERROR;
}
if (txn && (txn->flags.conn & CONN_UPGRADE)) {
const char **hdr = spool_getheader(txn->req_hdrs, "HTTP2-Settings");
if (!hdr || hdr[1]) return 0;
/* base64url decode the settings.
Use the SASL base64 decoder after replacing the encoded values
for chars 62 and 63 and adding appropriate padding. */
unsigned outlen;
struct buf buf;
buf_init_ro_cstr(&buf, hdr[0]);
buf_replace_char(&buf, '-', '+');
buf_replace_char(&buf, '_', '/');
buf_appendmap(&buf, "==", (4 - (buf_len(&buf) % 4)) % 4);
r = sasl_decode64(buf_base(&buf), buf_len(&buf),
(char *) buf_base(&buf), buf_len(&buf), &outlen);
if (r != SASL_OK) {
syslog(LOG_WARNING, "sasl_decode64 failed: %s",
sasl_errstring(r, NULL, NULL));
buf_free(&buf);
return HTTP_BAD_REQUEST;
}
r = nghttp2_session_upgrade2(conn->http2_session,
(const uint8_t *) buf_base(&buf),
outlen, txn->meth == METH_HEAD, NULL);
buf_free(&buf);
if (r) {
syslog(LOG_WARNING, "nghttp2_session_upgrade: %s",
nghttp2_strerror(r));
return HTTP_BAD_REQUEST;
}
/* tell client to start h2c upgrade (RFC 7540) */
response_header(HTTP_SWITCH_PROT, txn);
txn->flags.ver = VER_2;
txn->http2.stream_id =
nghttp2_session_get_last_proc_stream_id(conn->http2_session);
}
r = nghttp2_submit_settings(conn->http2_session, NGHTTP2_FLAG_NONE, &iv, 1);
if (r) {
syslog(LOG_ERR, "nghttp2_submit_settings: %s", nghttp2_strerror(r));
return HTTP_SERVER_ERROR;
}
return 0;
}
static void http2_end(struct http_connection *conn)
{
nghttp2_option_del(conn->http2_options);
nghttp2_session_del(conn->http2_session);
}
static void http2_output(struct transaction_t *txn)
{
if (nghttp2_session_want_write(txn->conn->http2_session)) {
/* Send queued frame(s) */
int r = nghttp2_session_send(txn->conn->http2_session);
if (r) {
syslog(LOG_ERR, "nghttp2_session_send: %s", nghttp2_strerror(r));
txn->flags.conn = CONN_CLOSE;
}
}
}
static void http2_input(struct transaction_t *txn)
{
int want_read = nghttp2_session_want_read(txn->conn->http2_session);
int goaway = txn->flags.conn & CONN_CLOSE;
nghttp2_error_code err = goaway ? NGHTTP2_REFUSED_STREAM : NGHTTP2_NO_ERROR;
syslog(LOG_DEBUG, "http2_input() goaway: %d, eof: %d, want read: %d",
goaway, txn->conn->pin->eof, want_read);
if (want_read && !goaway) {
/* Read frame(s) */
int r = nghttp2_session_recv(txn->conn->http2_session);
if (!r) {
/* Successfully received frames */
syslog(LOG_DEBUG, "nghttp2_session_recv: success");
}
else if (r == NGHTTP2_ERR_EOF) {
/* Client closed connection */
syslog(LOG_DEBUG, "client closed connection");
txn->flags.conn = CONN_CLOSE;
}
else {
/* Failure */
syslog(LOG_DEBUG, "nghttp2_session_recv: %s (%s)",
nghttp2_strerror(r), prot_error(txn->conn->pin));
goaway = 1;
if (r == NGHTTP2_ERR_CALLBACK_FAILURE) {
/* Client timeout */
txn->error.desc = prot_error(txn->conn->pin);
err = NGHTTP2_REFUSED_STREAM;
}
else {
txn->error.desc = nghttp2_strerror(r);
if (r == NGHTTP2_ERR_NOMEM)
err = NGHTTP2_INTERNAL_ERROR;
else if (r == NGHTTP2_ERR_BAD_CLIENT_MAGIC)
err = NGHTTP2_PROTOCOL_ERROR;
else if (r == NGHTTP2_ERR_FLOODED)
err = NGHTTP2_ENHANCE_YOUR_CALM;
}
}
}
if (goaway) {
/* Tell client we are closing session */
int32_t stream_id =
nghttp2_session_get_last_proc_stream_id(txn->conn->http2_session);
syslog(LOG_WARNING, "%s, closing connection", txn->error.desc);
syslog(LOG_DEBUG, "nghttp2_submit_goaway()");
int r = nghttp2_submit_goaway(txn->conn->http2_session,
NGHTTP2_FLAG_NONE, stream_id, err,
(const uint8_t *) txn->error.desc,
strlen(txn->error.desc));
if (r) {
syslog(LOG_ERR, "nghttp2_submit_goaway: %s", nghttp2_strerror(r));
}
else http2_output(txn);
txn->flags.conn = CONN_CLOSE;
}
return;
}
static void http2_add_header(struct transaction_t *txn,
const char *name, struct buf *value)
{
if (txn->http2.num_resp_hdrs >= HTTP2_MAX_HEADERS) {
buf_free(value);
return;
}
else {
nghttp2_nv *nv = &txn->http2.resp_hdrs[txn->http2.num_resp_hdrs];
free(nv->value);
nv->namelen = strlen(name);
nv->name = (uint8_t *) name;
nv->valuelen = buf_len(value);
nv->value = (uint8_t *) buf_release(value);
nv->flags = NGHTTP2_NV_FLAG_NO_COPY_VALUE;
txn->http2.num_resp_hdrs++;
}
}
static int http2_end_headers(struct transaction_t *txn, long code)
{
uint8_t flags = NGHTTP2_FLAG_NONE;
int r;
syslog(LOG_DEBUG,
"end_resp_headers(code = %ld, len = %ld, flags.te = %#x)",
code, txn->resp_body.len, txn->flags.te);
switch (code) {
case 0:
/* Trailer */
flags = NGHTTP2_FLAG_END_STREAM;
break;
case HTTP_CONTINUE:
case HTTP_PROCESSING:
/* Provisional response */
break;
case HTTP_NO_CONTENT:
case HTTP_NOT_MODIFIED:
/* MUST NOT include a body */
flags = NGHTTP2_FLAG_END_STREAM;
break;
default:
if (txn->meth == METH_HEAD) {
/* MUST NOT include a body */
flags = NGHTTP2_FLAG_END_STREAM;
}
else if (!(txn->resp_body.len || (txn->flags.te & TE_CHUNKED))) {
/* Empty body */
flags = NGHTTP2_FLAG_END_STREAM;
}
break;
}
syslog(LOG_DEBUG, "%s(id=%d, flags=%#x)",
code ? "nghttp2_submit headers" : "nghttp2_submit_trailers",
txn->http2.stream_id, flags);
if (code) {
r = nghttp2_submit_headers(txn->conn->http2_session,
flags, txn->http2.stream_id, NULL,
txn->http2.resp_hdrs,
txn->http2.num_resp_hdrs, NULL);
}
else {
r = nghttp2_submit_trailer(txn->conn->http2_session,
txn->http2.stream_id,
txn->http2.resp_hdrs,
txn->http2.num_resp_hdrs);
}
if (r) {
syslog(LOG_ERR, "%s: %s",
code ? "nghttp2_submit headers" : "nghttp2_submit_trailers",
nghttp2_strerror(r));
}
return r;
}
static void http2_data_chunk(struct transaction_t *txn,
const char *data, unsigned datalen,
int last_chunk, MD5_CTX *md5ctx)
{
static unsigned char md5[MD5_DIGEST_LENGTH];
uint8_t flags = NGHTTP2_FLAG_END_STREAM;
nghttp2_data_provider prd;
int r;
/* NOTE: The protstream that we use as the data source MUST remain
available until the data source read callback has retrieved all data */
prd.source.ptr = prot_readmap(data, datalen);
prd.read_callback = http2_data_source_read_cb;
if (txn->flags.te) {
if (!last_chunk) {
flags = NGHTTP2_FLAG_NONE;
if (datalen && (txn->flags.trailer & TRAILER_CMD5)) {
MD5Update(md5ctx, data, datalen);
}
}
else if (txn->flags.trailer) {
flags = NGHTTP2_FLAG_NONE;
if (txn->flags.trailer & TRAILER_CMD5) MD5Final(md5, md5ctx);
}
}
syslog(LOG_DEBUG, "nghttp2_submit_data(id=%d, datalen=%d, flags=%#x)",
txn->http2.stream_id, datalen, flags);
r = nghttp2_submit_data(txn->conn->http2_session,
flags, txn->http2.stream_id, &prd);
if (r) {
syslog(LOG_ERR, "nghttp2_submit_data: %s", nghttp2_strerror(r));
}
else {
http2_output(txn);
if (last_chunk && (txn->flags.trailer & TRAILER_CMD5)) {
begin_resp_headers(txn, 0);
content_md5_hdr(txn, md5);
end_resp_headers(txn, 0);
}
}
}
#else /* !HAVE_NGHTTP2 */
#define NGHTTP2_CLEARTEXT_PROTO_VERSION_ID ""
#define alpn_select_cb NULL
static void *http2_callbacks = NULL;
static void http2_init(struct buf *serverinfo __attribute__((unused))) {}
static void http2_done() {}
static int http2_preface(struct transaction_t *txn __attribute__((unused)))
{
return 0;
}
static int http2_start(void *conn __attribute__((unused)),
struct transaction_t *txn __attribute__((unused)))
{
fatal("http2_start() called, but no Nghttp2", EC_SOFTWARE);
}