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source: mod_gnutls/src/gnutls_io.c @ 316bd8c

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Last change on this file since 316bd8c was 316bd8c, checked in by Paul Querna <chip@…>, 18 years ago
remove more debug logging. fix a crash by changing the certificate structure after starting the handshake.
Property mode set to `100644`
File size: 21.5 KB

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1	/**
2	* Copyright 2004-2005 Paul Querna
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*
16	*/
17
18	#include "mod_gnutls.h"
19
20	/**
21	* Describe how the GnuTLS Filter system works here
22	* - Basicly the same as what mod_ssl does with OpenSSL.
23	*
24	*/
25
26	#define HTTP_ON_HTTPS_PORT \
27	"GET /" CRLF
28
29	#define HTTP_ON_HTTPS_PORT_BUCKET(alloc) \
30	apr_bucket_immortal_create(HTTP_ON_HTTPS_PORT, \
31	sizeof(HTTP_ON_HTTPS_PORT) - 1, \
32	alloc)
33
34	static apr_status_t gnutls_io_filter_error(ap_filter_t * f,
35	apr_bucket_brigade * bb,
36	apr_status_t status)
37	{
38	mod_gnutls_handle_t ctxt = (mod_gnutls_handle_t ) f->ctx;
39	apr_bucket *bucket;
40
41	switch (status) {
42	case HTTP_BAD_REQUEST:
43	/* log the situation */
44	ap_log_error(APLOG_MARK, APLOG_INFO, 0,
45	f->c->base_server,
46	"GnuTLS handshake failed: HTTP spoken on HTTPS port; "
47	"trying to send HTML error page");
48
49	ctxt->status = -1;
50
51	/* fake the request line */
52	bucket = HTTP_ON_HTTPS_PORT_BUCKET(f->c->bucket_alloc);
53	break;
54
55	default:
56	return status;
57	}
58
59	APR_BRIGADE_INSERT_TAIL(bb, bucket);
60	bucket = apr_bucket_eos_create(f->c->bucket_alloc);
61	APR_BRIGADE_INSERT_TAIL(bb, bucket);
62
63	return APR_SUCCESS;
64	}
65
66	static int char_buffer_read(mod_gnutls_char_buffer_t * buffer, char *in,
67	int inl)
68	{
69	if (!buffer->length) {
70	return 0;
71	}
72
73	if (buffer->length > inl) {
74	/* we have have enough to fill the caller's buffer */
75	memcpy(in, buffer->value, inl);
76	buffer->value += inl;
77	buffer->length -= inl;
78	}
79	else {
80	/* swallow remainder of the buffer */
81	memcpy(in, buffer->value, buffer->length);
82	inl = buffer->length;
83	buffer->value = NULL;
84	buffer->length = 0;
85	}
86
87	return inl;
88	}
89
90	static int char_buffer_write(mod_gnutls_char_buffer_t * buffer, char *in,
91	int inl)
92	{
93	buffer->value = in;
94	buffer->length = inl;
95	return inl;
96	}
97
98	/**
99	* From mod_ssl / ssl_engine_io.c
100	* This function will read from a brigade and discard the read buckets as it
101	* proceeds. It will read at most *len bytes.
102	*/
103	static apr_status_t brigade_consume(apr_bucket_brigade * bb,
104	apr_read_type_e block,
105	char c, apr_size_t len)
106	{
107	apr_size_t actual = 0;
108	apr_status_t status = APR_SUCCESS;
109
110	while (!APR_BRIGADE_EMPTY(bb)) {
111	apr_bucket *b = APR_BRIGADE_FIRST(bb);
112	const char *str;
113	apr_size_t str_len;
114	apr_size_t consume;
115
116	/* Justin points out this is an http-ism that might
117	* not fit if brigade_consume is added to APR. Perhaps
118	* apr_bucket_read(eos_bucket) should return APR_EOF?
119	* Then this becomes mainline instead of a one-off.
120	*/
121	if (APR_BUCKET_IS_EOS(b)) {
122	status = APR_EOF;
123	break;
124	}
125
126	/* The reason I'm not offering brigade_consume yet
127	* across to apr-util is that the following call
128	* illustrates how borked that API really is. For
129	* this sort of case (caller provided buffer) it
130	* would be much more trivial for apr_bucket_consume
131	* to do all the work that follows, based on the
132	* particular characteristics of the bucket we are
133	* consuming here.
134	*/
135	status = apr_bucket_read(b, &str, &str_len, block);
136
137	if (status != APR_SUCCESS) {
138	if (APR_STATUS_IS_EOF(status)) {
139	/* This stream bucket was consumed */
140	apr_bucket_delete(b);
141	continue;
142	}
143	break;
144	}
145
146	if (str_len > 0) {
147	/* Do not block once some data has been consumed */
148	block = APR_NONBLOCK_READ;
149
150	/* Assure we don't overflow. */
151	consume = (str_len + actual > len) ? len - actual : str_len;
152
153	memcpy(c, str, consume);
154
155	c += consume;
156	actual += consume;
157
158	if (consume >= b->length) {
159	/* This physical bucket was consumed */
160	apr_bucket_delete(b);
161	}
162	else {
163	/* Only part of this physical bucket was consumed */
164	b->start += consume;
165	b->length -= consume;
166	}
167	}
168	else if (b->length == 0) {
169	apr_bucket_delete(b);
170	}
171
172	/* This could probably be actual == *len, but be safe from stray
173	* photons. */
174	if (actual >= *len) {
175	break;
176	}
177	}
178
179	*len = actual;
180	return status;
181	}
182
183
184	static apr_status_t gnutls_io_input_read(mod_gnutls_handle_t * ctxt,
185	char buf, apr_size_t len)
186	{
187	apr_size_t wanted = *len;
188	apr_size_t bytes = 0;
189	int rc;
190
191	*len = 0;
192
193	/* If we have something leftover from last time, try that first. */
194	if ((bytes = char_buffer_read(&ctxt->input_cbuf, buf, wanted))) {
195	*len = bytes;
196	if (ctxt->input_mode == AP_MODE_SPECULATIVE) {
197	/* We want to rollback this read. */
198	if (ctxt->input_cbuf.length > 0) {
199	ctxt->input_cbuf.value -= bytes;
200	ctxt->input_cbuf.length += bytes;
201	}
202	else {
203	char_buffer_write(&ctxt->input_cbuf, buf, (int) bytes);
204	}
205	return APR_SUCCESS;
206	}
207	/* This could probably be *len == wanted, but be safe from stray
208	* photons.
209	*/
210	if (*len >= wanted) {
211	return APR_SUCCESS;
212	}
213	if (ctxt->input_mode == AP_MODE_GETLINE) {
214	if (memchr(buf, APR_ASCII_LF, *len)) {
215	return APR_SUCCESS;
216	}
217	}
218	else {
219	/* Down to a nonblock pattern as we have some data already
220	*/
221	ctxt->input_block = APR_NONBLOCK_READ;
222	}
223	}
224
225	while (1) {
226
227	rc = gnutls_record_recv(ctxt->session, buf + bytes, wanted - bytes);
228
229	if (rc > 0) {
230	*len += rc;
231	if (ctxt->input_mode == AP_MODE_SPECULATIVE) {
232	/* We want to rollback this read. */
233	char_buffer_write(&ctxt->input_cbuf, buf, rc);
234	}
235	return ctxt->input_rc;
236	}
237	else if (rc == 0) {
238	/* If EAGAIN, we will loop given a blocking read,
239	* otherwise consider ourselves at EOF.
240	*/
241	if (APR_STATUS_IS_EAGAIN(ctxt->input_rc)
242	\|\| APR_STATUS_IS_EINTR(ctxt->input_rc)) {
243	/* Already read something, return APR_SUCCESS instead.
244	* On win32 in particular, but perhaps on other kernels,
245	* a blocking call isn't 'always' blocking.
246	*/
247	if (*len > 0) {
248	ctxt->input_rc = APR_SUCCESS;
249	break;
250	}
251	if (ctxt->input_block == APR_NONBLOCK_READ) {
252	break;
253	}
254	}
255	else {
256	if (*len > 0) {
257	ctxt->input_rc = APR_SUCCESS;
258	}
259	else {
260	ctxt->input_rc = APR_EOF;
261	}
262	break;
263	}
264	}
265	else { /* (rc < 0) */
266
267	if (rc == GNUTLS_E_REHANDSHAKE) {
268	/* A client has asked for a new Hankshake. Currently, we don't do it */
269	ap_log_error(APLOG_MARK, APLOG_INFO, ctxt->input_rc,
270	ctxt->c->base_server,
271	"GnuTLS: Error reading data. Client Requested a New Handshake."
272	" (%d) '%s'", rc, gnutls_strerror(rc));
273	}
274	else if (rc == GNUTLS_E_WARNING_ALERT_RECEIVED) {
275	rc = gnutls_alert_get(ctxt->session);
276	ap_log_error(APLOG_MARK, APLOG_INFO, ctxt->input_rc,
277	ctxt->c->base_server,
278	"GnuTLS: Warning Alert From Client: "
279	" (%d) '%s'", rc, gnutls_alert_get_name(rc));
280	}
281	else if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED) {
282	rc = gnutls_alert_get(ctxt->session);
283	ap_log_error(APLOG_MARK, APLOG_INFO, ctxt->input_rc,
284	ctxt->c->base_server,
285	"GnuTLS: Fatal Alert From Client: "
286	"(%d) '%s'", rc, gnutls_alert_get_name(rc));
287	ctxt->input_rc = APR_EGENERAL;
288	break;
289	}
290	else {
291	/* Some Other Error. Report it. Die. */
292	if(gnutls_error_is_fatal(rc)) {
293	ap_log_error(APLOG_MARK, APLOG_INFO, ctxt->input_rc,
294	ctxt->c->base_server,
295	"GnuTLS: Error reading data. (%d) '%s'", rc,
296	gnutls_strerror(rc));
297	}
298	else if(*len > 0) {
299	ctxt->input_rc = APR_SUCCESS;
300	break;
301	}
302	}
303
304	if (ctxt->input_rc == APR_SUCCESS) {
305	ctxt->input_rc = APR_EGENERAL;
306	}
307	break;
308	}
309	}
310	return ctxt->input_rc;
311	}
312
313	static apr_status_t gnutls_io_input_getline(mod_gnutls_handle_t * ctxt,
314	char buf, apr_size_t len)
315	{
316	const char *pos = NULL;
317	apr_status_t status;
318	apr_size_t tmplen = len, buflen = len, offset = 0;
319
320	*len = 0;
321
322	while (tmplen > 0) {
323	status = gnutls_io_input_read(ctxt, buf + offset, &tmplen);
324
325	if (status != APR_SUCCESS) {
326	return status;
327	}
328
329	*len += tmplen;
330
331	if ((pos = memchr(buf, APR_ASCII_LF, *len))) {
332	break;
333	}
334
335	offset += tmplen;
336	tmplen = buflen - offset;
337	}
338
339	if (pos) {
340	char *value;
341	int length;
342	apr_size_t bytes = pos - buf;
343
344	bytes += 1;
345	value = buf + bytes;
346	length = *len - bytes;
347
348	char_buffer_write(&ctxt->input_cbuf, value, length);
349
350	*len = bytes;
351	}
352
353	return APR_SUCCESS;
354	}
355
356	static int gnutls_do_handshake(mod_gnutls_handle_t * ctxt)
357	{
358	int ret;
359	int errcode;
360	if (ctxt->status != 0) {
361	return -1;
362	}
363
364	tryagain:
365	do {
366	ret = gnutls_handshake(ctxt->session);
367	} while (ret == GNUTLS_E_AGAIN);
368
369	if (ret < 0) {
370	if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED
371	\|\| ret == GNUTLS_E_FATAL_ALERT_RECEIVED) {
372	errcode = gnutls_alert_get(ctxt->session);
373	ap_log_error(APLOG_MARK, APLOG_ERR, 0, ctxt->c->base_server,
374	"GnuTLS: Hanshake Alert (%d) '%s'.", errcode,
375	gnutls_alert_get_name(errcode));
376	}
377
378	if (!gnutls_error_is_fatal(ret)) {
379	ap_log_error(APLOG_MARK, APLOG_INFO, 0, ctxt->c->base_server,
380	"GnuTLS: Non-Fatal Handshake Error: (%d) '%s'", ret,
381	gnutls_strerror(ret));
382	goto tryagain;
383	}
384	#if USING_2_1_RECENT
385	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
386	"GnuTLS: Handshake Failed (%d) '%s'", ret,
387	gnutls_strerror(ret));
388	#else
389	ap_log_error(APLOG_MARK, APLOG_ERR, 0, ctxt->c->base_server,
390	"GnuTLS: Handshake Failed (%d) '%s'", ret,
391	gnutls_strerror(ret));
392	#endif
393	ctxt->status = -1;
394	gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL,
395	gnutls_error_to_alert(ret, NULL));
396	gnutls_deinit(ctxt->session);
397	return ret;
398	}
399	else {
400	/* all done with the handshake */
401	ctxt->status = 1;
402	return 0;
403	}
404	}
405
406	int mod_gnutls_rehandshake(mod_gnutls_handle_t * ctxt)
407	{
408	int rv;
409
410	rv = gnutls_rehandshake(ctxt->session);
411
412	if (rv != 0) {
413	/* the client did not want to rehandshake. goodbye */
414	ap_log_error(APLOG_MARK, APLOG_ERR, 0, ctxt->c->base_server,
415	"GnuTLS: Client Refused Rehandshake request.");
416	return -1;
417	}
418
419	ctxt->status = 0;
420
421	rv = gnutls_do_handshake(ctxt);
422
423	return rv;
424	}
425
426
427	apr_status_t mod_gnutls_filter_input(ap_filter_t* f,
428	apr_bucket_brigade * bb,
429	ap_input_mode_t mode,
430	apr_read_type_e block,
431	apr_off_t readbytes)
432	{
433	apr_status_t status = APR_SUCCESS;
434	mod_gnutls_handle_t ctxt = (mod_gnutls_handle_t ) f->ctx;
435	apr_size_t len = sizeof(ctxt->input_buffer);
436
437	if (f->c->aborted) {
438	apr_bucket *bucket = apr_bucket_eos_create(f->c->bucket_alloc);
439	APR_BRIGADE_INSERT_TAIL(bb, bucket);
440	return APR_ECONNABORTED;
441	}
442
443	if (ctxt->status == 0) {
444	gnutls_do_handshake(ctxt);
445	}
446
447	if (ctxt->status < 0) {
448	return ap_get_brigade(f->next, bb, mode, block, readbytes);
449	}
450
451	/* XXX: we don't currently support anything other than these modes. */
452	if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE &&
453	mode != AP_MODE_SPECULATIVE && mode != AP_MODE_INIT) {
454	return APR_ENOTIMPL;
455	}
456
457	ctxt->input_mode = mode;
458	ctxt->input_block = block;
459
460	if (ctxt->input_mode == AP_MODE_READBYTES \|\|
461	ctxt->input_mode == AP_MODE_SPECULATIVE) {
462	/* Err. This is bad. readbytes can be a 64bit int! len.. is NOT */
463	if (readbytes < len) {
464	len = (apr_size_t) readbytes;
465	}
466	status = gnutls_io_input_read(ctxt, ctxt->input_buffer, &len);
467	}
468	else if (ctxt->input_mode == AP_MODE_GETLINE) {
469	status = gnutls_io_input_getline(ctxt, ctxt->input_buffer, &len);
470	}
471	else {
472	/* We have no idea what you are talking about, so return an error. */
473	return APR_ENOTIMPL;
474	}
475
476	if (status != APR_SUCCESS) {
477	return gnutls_io_filter_error(f, bb, status);
478	}
479
480	/* Create a transient bucket out of the decrypted data. */
481	if (len > 0) {
482	apr_bucket *bucket =
483	apr_bucket_transient_create(ctxt->input_buffer, len,
484	f->c->bucket_alloc);
485	APR_BRIGADE_INSERT_TAIL(bb, bucket);
486	}
487
488	return status;
489	}
490
491	apr_status_t mod_gnutls_filter_output(ap_filter_t * f,
492	apr_bucket_brigade * bb)
493	{
494	apr_size_t ret;
495	apr_bucket* e;
496	mod_gnutls_handle_t ctxt = (mod_gnutls_handle_t ) f->ctx;
497	apr_status_t status = APR_SUCCESS;
498	apr_read_type_e rblock = APR_NONBLOCK_READ;
499
500	if (f->c->aborted) {
501	apr_brigade_cleanup(bb);
502	return APR_ECONNABORTED;
503	}
504
505	if (ctxt->status == 0) {
506	gnutls_do_handshake(ctxt);
507	}
508
509	if (ctxt->status < 0) {
510	return ap_pass_brigade(f->next, bb);
511	}
512
513	while (!APR_BRIGADE_EMPTY(bb)) {
514	apr_bucket *bucket = APR_BRIGADE_FIRST(bb);
515	if (AP_BUCKET_IS_EOC(bucket)) {
516	do {
517	ret = gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL,
518	GNUTLS_A_CLOSE_NOTIFY);
519	} while(ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
520
521	apr_bucket_copy(bucket, &e);
522	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, e);
523
524	if ((status = ap_pass_brigade(f->next, ctxt->output_bb)) != APR_SUCCESS) {
525	apr_brigade_cleanup(ctxt->output_bb);
526	return status;
527	}
528
529	apr_brigade_cleanup(ctxt->output_bb);
530	gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
531	gnutls_deinit(ctxt->session);
532	continue;
533
534	} else if (APR_BUCKET_IS_FLUSH(bucket) \|\| APR_BUCKET_IS_EOS(bucket)) {
535
536	apr_bucket_copy(bucket, &e);
537	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, e);
538	if ((status = ap_pass_brigade(f->next, bb)) != APR_SUCCESS) {
539	apr_brigade_cleanup(ctxt->output_bb);
540	return status;
541	}
542	apr_brigade_cleanup(ctxt->output_bb);
543	continue;
544	}
545	else {
546	/* filter output */
547	const char *data;
548	apr_size_t len;
549
550	status = apr_bucket_read(bucket, &data, &len, rblock);
551
552	if (APR_STATUS_IS_EAGAIN(status)) {
553	rblock = APR_BLOCK_READ;
554	continue; /* and try again with a blocking read. */
555	}
556
557	rblock = APR_NONBLOCK_READ;
558
559	if (!APR_STATUS_IS_EOF(status) && (status != APR_SUCCESS)) {
560	break;
561	}
562
563	do {
564	ret = gnutls_record_send(ctxt->session, data, len);
565	}
566	while(ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
567
568	if (ret < 0) {
569	/* error sending output */
570	ap_log_error(APLOG_MARK, APLOG_INFO, ctxt->output_rc,
571	ctxt->c->base_server,
572	"GnuTLS: Error writing data."
573	" (%d) '%s'", ret, gnutls_strerror(ret));
574	if (ctxt->output_rc == APR_SUCCESS) {
575	ctxt->output_rc = APR_EGENERAL;
576	}
577	}
578	else if (ret != len) {
579	/* Not able to send the entire bucket,
580	split it and send it again. */
581	apr_bucket_split(bucket, ret);
582	}
583
584	apr_bucket_delete(bucket);
585
586	if (ctxt->output_rc != APR_SUCCESS) {
587	break;
588	}
589	}
590	}
591
592	return status;
593	}
594
595	ssize_t mod_gnutls_transport_read(gnutls_transport_ptr_t ptr,
596	void *buffer, size_t len)
597	{
598	mod_gnutls_handle_t *ctxt = ptr;
599	apr_status_t rc;
600	apr_size_t in = len;
601	apr_read_type_e block = ctxt->input_block;
602
603	ctxt->input_rc = APR_SUCCESS;
604
605	/* If Len = 0, we don't do anything. */
606	if (!len)
607	return 0;
608
609	if (!ctxt->input_bb) {
610	ctxt->input_rc = APR_EOF;
611	return -1;
612	}
613
614	if (APR_BRIGADE_EMPTY(ctxt->input_bb)) {
615
616	rc = ap_get_brigade(ctxt->input_filter->next, ctxt->input_bb,
617	AP_MODE_READBYTES, ctxt->input_block, in);
618
619	/* Not a problem, there was simply no data ready yet.
620	*/
621	if (APR_STATUS_IS_EAGAIN(rc) \|\| APR_STATUS_IS_EINTR(rc)
622	\|\| (rc == APR_SUCCESS && APR_BRIGADE_EMPTY(ctxt->input_bb))) {
623	return 0;
624	}
625
626	if (rc != APR_SUCCESS) {
627	/* Unexpected errors discard the brigade */
628	apr_brigade_cleanup(ctxt->input_bb);
629	ctxt->input_bb = NULL;
630	return -1;
631	}
632	}
633
634	ctxt->input_rc = brigade_consume(ctxt->input_bb, block, buffer, &len);
635
636	if (ctxt->input_rc == APR_SUCCESS) {
637	return (ssize_t) len;
638	}
639
640	if (APR_STATUS_IS_EAGAIN(ctxt->input_rc)
641	\|\| APR_STATUS_IS_EINTR(ctxt->input_rc)) {
642	return (ssize_t) len;
643	}
644
645	/* Unexpected errors and APR_EOF clean out the brigade.
646	* Subsequent calls will return APR_EOF.
647	*/
648	apr_brigade_cleanup(ctxt->input_bb);
649	ctxt->input_bb = NULL;
650
651	if (APR_STATUS_IS_EOF(ctxt->input_rc) && len) {
652	/* Provide the results of this read pass,
653	* without resetting the BIO retry_read flag
654	*/
655	return (ssize_t) len;
656	}
657
658	return -1;
659	}
660
661
662	static ssize_t write_flush(mod_gnutls_handle_t * ctxt)
663	{
664	apr_bucket *e;
665
666	if (!(ctxt->output_blen \|\| ctxt->output_length)) {
667	ctxt->output_rc = APR_SUCCESS;
668	return 1;
669	}
670
671	if (ctxt->output_blen) {
672	e = apr_bucket_transient_create(ctxt->output_buffer,
673	ctxt->output_blen,
674	ctxt->output_bb->bucket_alloc);
675	/* we filled this buffer first so add it to the
676	* head of the brigade
677	*/
678	APR_BRIGADE_INSERT_HEAD(ctxt->output_bb, e);
679	ctxt->output_blen = 0;
680	}
681
682	ctxt->output_length = 0;
683	e = apr_bucket_flush_create(ctxt->output_bb->bucket_alloc);
684	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, e);
685
686	ctxt->output_rc = ap_pass_brigade(ctxt->output_filter->next,
687	ctxt->output_bb);
688	/* clear the brigade to be ready for next time */
689	apr_brigade_cleanup(ctxt->output_bb);
690
691	return (ctxt->output_rc == APR_SUCCESS) ? 1 : -1;
692	}
693
694	ssize_t mod_gnutls_transport_write(gnutls_transport_ptr_t ptr,
695	const void *buffer, size_t len)
696	{
697	mod_gnutls_handle_t *ctxt = ptr;
698
699	/* pass along the encrypted data
700	* need to flush since we're using SSL's malloc-ed buffer
701	* which will be overwritten once we leave here
702	*/
703	apr_bucket *bucket = apr_bucket_transient_create(buffer, len,
704	ctxt->output_bb->bucket_alloc);
705	ctxt->output_length += len;
706	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, bucket);
707
708	if (write_flush(ctxt) < 0) {
709	return -1;
710	}
711	return len;
712	}

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