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gnutls_io.c @ 04addef

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Last change on this file since 04addef was b2e6406, checked in by Thomas Klute <thomas2.klute@…>, 4 years ago

Safe integer type conversion in mgs_filter_input()

Read sizes should be too small for 32 or 64 bit integer length to
matter, but we have to make sure.

Property mode set to 100644

File size: 27.7 KB

Rev	Line
[fcb122d]	1	/**
	2	* Copyright 2004-2005 Paul Querna
[e183628]	3	* Copyright 2008 Nikos Mavrogiannopoulos
	4	* Copyright 2011 Dash Shendy
[8913410]	5	* Copyright 2015-2016 Thomas Klute
[7e2b223]	6	*
	7	* Licensed under the Apache License, Version 2.0 (the "License");
	8	* you may not use this file except in compliance with the License.
	9	* You may obtain a copy of the License at
	10	*
	11	* http://www.apache.org/licenses/LICENSE-2.0
	12	*
	13	* Unless required by applicable law or agreed to in writing, software
	14	* distributed under the License is distributed on an "AS IS" BASIS,
	15	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	16	* See the License for the specific language governing permissions and
	17	* limitations under the License.
	18	*
	19	*/
	20
	21	#include "mod_gnutls.h"
	22
[55dc3f0]	23	#ifdef APLOG_USE_MODULE
	24	APLOG_USE_MODULE(gnutls);
	25	#endif
	26
[7e2b223]	27	/**
[671b64f]	28	* Describe how the GnuTLS Filter system works here
[dae0aec]	29	* - Basicly the same as what mod_ssl does with OpenSSL.
	30	*
[7e2b223]	31	*/
	32
[dae0aec]	33	#define HTTP_ON_HTTPS_PORT \
	34	"GET /" CRLF
[7e2b223]	35
[dae0aec]	36	#define HTTP_ON_HTTPS_PORT_BUCKET(alloc) \
	37	apr_bucket_immortal_create(HTTP_ON_HTTPS_PORT, \
	38	sizeof(HTTP_ON_HTTPS_PORT) - 1, \
	39	alloc)
[7e2b223]	40
[265eafc]	41	#define IS_PROXY_STR(c) \
	42	((c->is_proxy == GNUTLS_ENABLED_TRUE) ? "proxy " : "")
	43
[02a6a18]	44	/**
	45	* Convert APR_EINTR or APR_EAGAIN to the match raw error code. Needed
	46	* to pass the status on to GnuTLS from the pull function.
	47	*/
	48	#define EAI_APR_TO_RAW(s) (APR_STATUS_IS_EAGAIN(s) ? EAGAIN : EINTR)
	49
	50
	51
[dae0aec]	52	static apr_status_t gnutls_io_filter_error(ap_filter_t * f,
[e183628]	53	apr_bucket_brigade * bb,
	54	apr_status_t status) {
	55	mgs_handle_t ctxt = (mgs_handle_t ) f->ctx;
	56	apr_bucket *bucket;
	57
	58	switch (status) {
[4fefa39]	59	case HTTP_BAD_REQUEST:
	60	/* log the situation */
[7511bfa]	61	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, f->c,
	62	"GnuTLS handshake failed: HTTP spoken on HTTPS port; "
	63	"trying to send HTML error page");
[4fefa39]	64	mgs_srvconf_rec sc = (mgs_srvconf_rec )
	65	ap_get_module_config(f->c->base_server->module_config,
	66	&gnutls_module);
	67	ctxt->status = -1;
	68	sc->non_ssl_request = 1;
	69
	70	/* fake the request line */
	71	bucket = HTTP_ON_HTTPS_PORT_BUCKET(f->c->bucket_alloc);
	72	break;
	73
	74	default:
	75	return status;
[e183628]	76	}
	77
	78	APR_BRIGADE_INSERT_TAIL(bb, bucket);
	79	bucket = apr_bucket_eos_create(f->c->bucket_alloc);
	80	APR_BRIGADE_INSERT_TAIL(bb, bucket);
	81
	82	return APR_SUCCESS;
[dae0aec]	83	}
[7e2b223]	84
[e183628]	85	static int char_buffer_read(mgs_char_buffer_t * buffer, char *in, int inl) {
	86	if (!buffer->length) {
	87	return 0;
	88	}
	89
	90	if (buffer->length > inl) {
	91	/* we have have enough to fill the caller's buffer */
	92	memmove(in, buffer->value, inl);
	93	buffer->value += inl;
	94	buffer->length -= inl;
	95	} else {
	96	/* swallow remainder of the buffer */
	97	memmove(in, buffer->value, buffer->length);
	98	inl = buffer->length;
	99	buffer->value = NULL;
	100	buffer->length = 0;
	101	}
	102
	103	return inl;
[dae0aec]	104	}
	105
[e183628]	106	static int char_buffer_write(mgs_char_buffer_t * buffer, char *in, int inl) {
	107	buffer->value = in;
	108	buffer->length = inl;
	109	return inl;
[7e2b223]	110	}
	111
	112	/**
	113	* From mod_ssl / ssl_engine_io.c
	114	* This function will read from a brigade and discard the read buckets as it
	115	* proceeds. It will read at most *len bytes.
	116	*/
	117	static apr_status_t brigade_consume(apr_bucket_brigade * bb,
[e183628]	118	apr_read_type_e block,
	119	char c, apr_size_t len) {
	120	apr_size_t actual = 0;
	121	apr_status_t status = APR_SUCCESS;
	122
	123	while (!APR_BRIGADE_EMPTY(bb)) {
	124	apr_bucket *b = APR_BRIGADE_FIRST(bb);
	125	const char *str;
	126	apr_size_t str_len;
	127	apr_size_t consume;
	128
	129	/* Justin points out this is an http-ism that might
	130	* not fit if brigade_consume is added to APR. Perhaps
	131	* apr_bucket_read(eos_bucket) should return APR_EOF?
	132	* Then this becomes mainline instead of a one-off.
	133	*/
	134	if (APR_BUCKET_IS_EOS(b)) {
	135	status = APR_EOF;
	136	break;
	137	}
	138
	139	/* The reason I'm not offering brigade_consume yet
	140	* across to apr-util is that the following call
	141	* illustrates how borked that API really is. For
	142	* this sort of case (caller provided buffer) it
	143	* would be much more trivial for apr_bucket_consume
	144	* to do all the work that follows, based on the
	145	* particular characteristics of the bucket we are
	146	* consuming here.
	147	*/
	148	status = apr_bucket_read(b, &str, &str_len, block);
	149
	150	if (status != APR_SUCCESS) {
	151	if (APR_STATUS_IS_EOF(status)) {
	152	/* This stream bucket was consumed */
	153	apr_bucket_delete(b);
	154	continue;
	155	}
	156	break;
	157	}
	158
	159	if (str_len > 0) {
	160	/* Do not block once some data has been consumed */
	161	block = APR_NONBLOCK_READ;
	162
	163	/* Assure we don't overflow. */
	164	consume =
	165	(str_len + actual >
	166	len) ? len - actual : str_len;
	167
	168	memcpy(c, str, consume);
	169
	170	c += consume;
	171	actual += consume;
	172
	173	if (consume >= b->length) {
	174	/* This physical bucket was consumed */
	175	apr_bucket_delete(b);
	176	} else {
	177	/* Only part of this physical bucket was consumed */
	178	b->start += consume;
	179	b->length -= consume;
	180	}
	181	} else if (b->length == 0) {
	182	apr_bucket_delete(b);
	183	}
[7e2b223]	184
[e183628]	185	/* This could probably be actual == *len, but be safe from stray
	186	* photons. */
	187	if (actual >= *len) {
	188	break;
	189	}
	190	}
	191
	192	*len = actual;
	193	return status;
	194	}
[7e2b223]	195
[c301152]	196	static apr_status_t gnutls_io_input_read(mgs_handle_t * ctxt,
[398d1a0]	197	char buf, apr_size_t len)
	198	{
[e183628]	199	apr_size_t wanted = *len;
	200	apr_size_t bytes = 0;
	201	int rc;
	202
	203	*len = 0;
	204
	205	/* If we have something leftover from last time, try that first. */
	206	if ((bytes = char_buffer_read(&ctxt->input_cbuf, buf, wanted))) {
	207	*len = bytes;
	208	if (ctxt->input_mode == AP_MODE_SPECULATIVE) {
	209	/* We want to rollback this read. */
	210	if (ctxt->input_cbuf.length > 0) {
	211	ctxt->input_cbuf.value -= bytes;
	212	ctxt->input_cbuf.length += bytes;
	213	} else {
	214	char_buffer_write(&ctxt->input_cbuf, buf,
	215	(int) bytes);
	216	}
	217	return APR_SUCCESS;
	218	}
	219	/* This could probably be *len == wanted, but be safe from stray
	220	* photons.
	221	*/
	222	if (*len >= wanted) {
	223	return APR_SUCCESS;
	224	}
	225	if (ctxt->input_mode == AP_MODE_GETLINE) {
	226	if (memchr(buf, APR_ASCII_LF, *len)) {
	227	return APR_SUCCESS;
	228	}
	229	} else {
	230	/* Down to a nonblock pattern as we have some data already
	231	*/
	232	ctxt->input_block = APR_NONBLOCK_READ;
	233	}
	234	}
	235
	236	if (ctxt->session == NULL) {
[398d1a0]	237	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
	238	"%s: GnuTLS session is NULL!", __func__);
[e183628]	239	return APR_EGENERAL;
	240	}
	241
[f5a36ee]	242	while (1)
	243	{
	244	rc = gnutls_record_recv(ctxt->session, buf + bytes, wanted - bytes);
[e183628]	245
[f5a36ee]	246	if (rc == GNUTLS_E_INTERRUPTED)
	247	ctxt->input_rc = APR_EINTR;
	248	else if (rc == GNUTLS_E_AGAIN)
	249	ctxt->input_rc = APR_EAGAIN;
[e183628]	250
	251	if (rc > 0) {
	252	*len += rc;
	253	if (ctxt->input_mode == AP_MODE_SPECULATIVE) {
	254	/* We want to rollback this read. */
	255	char_buffer_write(&ctxt->input_cbuf, buf,
	256	rc);
	257	}
	258	return ctxt->input_rc;
	259	} else if (rc == 0) {
	260	/* If EAGAIN, we will loop given a blocking read,
	261	* otherwise consider ourselves at EOF.
	262	*/
	263	if (APR_STATUS_IS_EAGAIN(ctxt->input_rc)
	264	\|\| APR_STATUS_IS_EINTR(ctxt->input_rc)) {
	265	/* Already read something, return APR_SUCCESS instead.
	266	* On win32 in particular, but perhaps on other kernels,
	267	* a blocking call isn't 'always' blocking.
	268	*/
	269	if (*len > 0) {
	270	ctxt->input_rc = APR_SUCCESS;
	271	break;
	272	}
	273	if (ctxt->input_block == APR_NONBLOCK_READ) {
	274	break;
	275	}
	276	} else {
	277	if (*len > 0) {
	278	ctxt->input_rc = APR_SUCCESS;
	279	} else {
	280	ctxt->input_rc = APR_EOF;
	281	}
	282	break;
	283	}
	284	} else { /* (rc < 0) */
	285
	286	if (rc == GNUTLS_E_REHANDSHAKE) {
	287	/* A client has asked for a new Hankshake. Currently, we don't do it */
[398d1a0]	288	ap_log_cerror(APLOG_MARK, APLOG_INFO,
[e183628]	289	ctxt->input_rc,
[398d1a0]	290	ctxt->c,
[e183628]	291	"GnuTLS: Error reading data. Client Requested a New Handshake."
	292	" (%d) '%s'", rc,
	293	gnutls_strerror(rc));
	294	} else if (rc == GNUTLS_E_WARNING_ALERT_RECEIVED) {
	295	rc = gnutls_alert_get(ctxt->session);
[398d1a0]	296	ap_log_cerror(APLOG_MARK, APLOG_INFO,
[e183628]	297	ctxt->input_rc,
[398d1a0]	298	ctxt->c,
[e183628]	299	"GnuTLS: Warning Alert From Client: "
	300	" (%d) '%s'", rc,
	301	gnutls_alert_get_name(rc));
	302	} else if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED) {
	303	rc = gnutls_alert_get(ctxt->session);
[398d1a0]	304	ap_log_cerror(APLOG_MARK, APLOG_INFO,
[e183628]	305	ctxt->input_rc,
[398d1a0]	306	ctxt->c,
[e183628]	307	"GnuTLS: Fatal Alert From Client: "
	308	"(%d) '%s'", rc,
	309	gnutls_alert_get_name(rc));
	310	ctxt->input_rc = APR_EGENERAL;
	311	break;
	312	} else {
	313	/* Some Other Error. Report it. Die. */
	314	if (gnutls_error_is_fatal(rc)) {
[398d1a0]	315	ap_log_cerror(APLOG_MARK,
[e183628]	316	APLOG_INFO,
	317	ctxt->input_rc,
[398d1a0]	318	ctxt->c,
[e183628]	319	"GnuTLS: Error reading data. (%d) '%s'",
	320	rc,
	321	gnutls_strerror(rc));
	322	} else if (*len > 0) {
	323	ctxt->input_rc = APR_SUCCESS;
	324	break;
	325	}
	326	}
	327
	328	if (ctxt->input_rc == APR_SUCCESS) {
[4261999]	329	ap_log_cerror(APLOG_MARK, APLOG_INFO, ctxt->input_rc, ctxt->c,
	330	"%s: GnuTLS error: %s (%d)",
	331	__func__, gnutls_strerror(rc), rc);
[e183628]	332	ctxt->input_rc = APR_EGENERAL;
	333	}
	334	break;
	335	}
	336	}
	337	return ctxt->input_rc;
[dae0aec]	338	}
	339
[c301152]	340	static apr_status_t gnutls_io_input_getline(mgs_handle_t * ctxt,
[e183628]	341	char buf, apr_size_t len) {
	342	const char *pos = NULL;
	343	apr_status_t status;
	344	apr_size_t tmplen = len, buflen = len, offset = 0;
[dae0aec]	345
[e183628]	346	*len = 0;
[dae0aec]	347
[e183628]	348	while (tmplen > 0) {
	349	status = gnutls_io_input_read(ctxt, buf + offset, &tmplen);
[dae0aec]	350
[e183628]	351	if (status != APR_SUCCESS) {
	352	return status;
	353	}
[dae0aec]	354
[e183628]	355	*len += tmplen;
[dae0aec]	356
[e183628]	357	if ((pos = memchr(buf, APR_ASCII_LF, *len))) {
	358	break;
	359	}
[dae0aec]	360
[e183628]	361	offset += tmplen;
	362	tmplen = buflen - offset;
	363	}
[dae0aec]	364
[e183628]	365	if (pos) {
	366	char *value;
	367	int length;
	368	apr_size_t bytes = pos - buf;
[dae0aec]	369
[e183628]	370	bytes += 1;
	371	value = buf + bytes;
	372	length = *len - bytes;
[dae0aec]	373
[e183628]	374	char_buffer_write(&ctxt->input_cbuf, value, length);
[dae0aec]	375
[e183628]	376	*len = bytes;
	377	}
[dae0aec]	378
[e183628]	379	return APR_SUCCESS;
[dae0aec]	380	}
	381
[0106b25]	382	#define HANDSHAKE_MAX_TRIES 1024
[e183628]	383
	384	static int gnutls_do_handshake(mgs_handle_t * ctxt) {
	385	int ret;
	386	int errcode;
	387	int maxtries = HANDSHAKE_MAX_TRIES;
	388
	389	if (ctxt->status != 0 \|\| ctxt->session == NULL) {
	390	return -1;
	391	}
	392
	393	tryagain:
	394	do {
	395	ret = gnutls_handshake(ctxt->session);
	396	maxtries--;
	397	} while ((ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN)
	398	&& maxtries > 0);
	399
	400	if (maxtries < 1) {
	401	ctxt->status = -1;
	402	ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c,
	403	"GnuTLS: Handshake Failed. Hit Maximum Attempts");
	404	if (ctxt->session) {
	405	gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL,
	406	gnutls_error_to_alert
	407	(GNUTLS_E_INTERNAL_ERROR, NULL));
	408	gnutls_deinit(ctxt->session);
	409	}
	410	ctxt->session = NULL;
	411	return -1;
	412	}
	413
	414	if (ret < 0) {
	415	if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED
	416	\|\| ret == GNUTLS_E_FATAL_ALERT_RECEIVED) {
	417	errcode = gnutls_alert_get(ctxt->session);
[7511bfa]	418	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
	419	"GnuTLS: Handshake Alert (%d) '%s'.",
	420	errcode, gnutls_alert_get_name(errcode));
[e183628]	421	}
	422
	423	if (!gnutls_error_is_fatal(ret)) {
[7511bfa]	424	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
	425	"GnuTLS: Non-Fatal Handshake Error: (%d) '%s'",
	426	ret, gnutls_strerror(ret));
[e183628]	427	goto tryagain;
	428	}
	429	ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c,
	430	"GnuTLS: Handshake Failed (%d) '%s'", ret,
	431	gnutls_strerror(ret));
	432	ctxt->status = -1;
	433	if (ctxt->session) {
	434	gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL,
	435	gnutls_error_to_alert(ret,
	436	NULL));
	437	gnutls_deinit(ctxt->session);
	438	}
	439	ctxt->session = NULL;
	440	return ret;
	441	} else {
	442	/* all done with the handshake */
	443	ctxt->status = 1;
[671b64f]	444	/* If the session was resumed, we did not set the correct
[e183628]	445	* server_rec in ctxt->sc. Go Find it. (ick!)
	446	*/
	447	if (gnutls_session_is_resumed(ctxt->session)) {
	448	mgs_srvconf_rec *sc;
	449	sc = mgs_find_sni_server(ctxt->session);
	450	if (sc) {
	451	ctxt->sc = sc;
	452	}
	453	}
[73f6f12]	454	return GNUTLS_E_SUCCESS;
[e183628]	455	}
[31645b2]	456	}
	457
[e183628]	458	int mgs_rehandshake(mgs_handle_t * ctxt) {
	459	int rv;
[e02dd8c]	460
[e183628]	461	if (ctxt->session == NULL)
	462	return -1;
[e02dd8c]	463
[e183628]	464	rv = gnutls_rehandshake(ctxt->session);
[e02dd8c]	465
[e183628]	466	if (rv != 0) {
	467	/* the client did not want to rehandshake. goodbye */
[7511bfa]	468	ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, ctxt->c,
	469	"GnuTLS: Client Refused Rehandshake request.");
[e183628]	470	return -1;
	471	}
[e02dd8c]	472
[e183628]	473	ctxt->status = 0;
[e02dd8c]	474
[e183628]	475	rv = gnutls_do_handshake(ctxt);
[e02dd8c]	476
[e183628]	477	return rv;
[dae0aec]	478	}
	479
[401a0de]	480
	481
	482	/**
	483	* Close the TLS session associated with the given connection
	484	* structure and free its resources
	485	*/
	486	static int mgs_bye(mgs_handle_t* ctxt)
	487	{
	488	int ret = GNUTLS_E_SUCCESS;
	489	/* End Of Connection */
	490	if (ctxt->session != NULL)
	491	{
	492	/* Try A Clean Shutdown */
	493	do {
	494	ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR);
	495	} while (ret == GNUTLS_E_INTERRUPTED \|\| ret == GNUTLS_E_AGAIN);
	496	if (ret != GNUTLS_E_SUCCESS)
[2ceb836]	497	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_EGENERAL, ctxt->c,
[401a0de]	498	"%s: Error while closing TLS %sconnection: "
	499	"'%s' (%d)",
	500	__func__, IS_PROXY_STR(ctxt),
	501	gnutls_strerror(ret), (int) ret);
	502	else
[2ceb836]	503	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ctxt->c,
[401a0de]	504	"%s: TLS %sconnection closed.",
	505	__func__, IS_PROXY_STR(ctxt));
	506	/* De-Initialize Session */
	507	gnutls_deinit(ctxt->session);
	508	ctxt->session = NULL;
	509	}
	510	return ret;
	511	}
	512
	513
	514
[e02dd8c]	515	apr_status_t mgs_filter_input(ap_filter_t * f,
[e183628]	516	apr_bucket_brigade * bb,
	517	ap_input_mode_t mode,
[265eafc]	518	apr_read_type_e block, apr_off_t readbytes)
	519	{
[e183628]	520	apr_status_t status = APR_SUCCESS;
	521	mgs_handle_t ctxt = (mgs_handle_t ) f->ctx;
	522	apr_size_t len = sizeof (ctxt->input_buffer);
	523
	524	if (f->c->aborted) {
	525	apr_bucket *bucket =
	526	apr_bucket_eos_create(f->c->bucket_alloc);
	527	APR_BRIGADE_INSERT_TAIL(bb, bucket);
[265eafc]	528	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
	529	"%s: %sconnection aborted",
	530	__func__, IS_PROXY_STR(ctxt));
[e183628]	531	return APR_ECONNABORTED;
	532	}
	533
	534	if (ctxt->status == 0) {
[73f6f12]	535	int ret = gnutls_do_handshake(ctxt);
	536	if (ret == GNUTLS_E_SUCCESS)
	537	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
	538	"%s: TLS %sconnection opened.",
	539	__func__, IS_PROXY_STR(ctxt));
[e183628]	540	}
	541
	542	if (ctxt->status < 0) {
[265eafc]	543	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
	544	"%s %s: ap_get_brigade", __func__, IS_PROXY_STR(ctxt));
[e183628]	545	return ap_get_brigade(f->next, bb, mode, block, readbytes);
	546	}
	547
	548	/* XXX: we don't currently support anything other than these modes. */
	549	if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE &&
	550	mode != AP_MODE_SPECULATIVE && mode != AP_MODE_INIT) {
	551	return APR_ENOTIMPL;
	552	}
	553
	554	ctxt->input_mode = mode;
	555	ctxt->input_block = block;
	556
	557	if (ctxt->input_mode == AP_MODE_READBYTES \|\|
	558	ctxt->input_mode == AP_MODE_SPECULATIVE) {
[fd82e59]	559	if (readbytes < 0) {
	560	/* you're asking us to speculatively read a negative number of bytes! */
	561	return APR_ENOTIMPL;
	562	}
[b2e6406]	563	/* 'readbytes' and 'len' are of different integer types, which
	564	* might have different lengths. Read sizes should be too
	565	* small for 32 or 64 bit to matter, but we have to make
	566	* sure. */
	567	if ((apr_size_t) readbytes < len
	568	&& __builtin_add_overflow(readbytes, 0, &len))
	569	{
	570	ap_log_cerror(APLOG_MARK, APLOG_CRIT, APR_EINVAL, ctxt->c,
	571	"%s: prevented buffer length overflow",
	572	__func__);
	573	return APR_EINVAL;
[e183628]	574	}
	575	status =
	576	gnutls_io_input_read(ctxt, ctxt->input_buffer, &len);
	577	} else if (ctxt->input_mode == AP_MODE_GETLINE) {
	578	status =
	579	gnutls_io_input_getline(ctxt, ctxt->input_buffer,
	580	&len);
	581	} else {
	582	/* We have no idea what you are talking about, so return an error. */
	583	return APR_ENOTIMPL;
	584	}
	585
[f5a36ee]	586	if (status != APR_SUCCESS)
	587	{
	588	/* no data for nonblocking read, return APR_EAGAIN */
[73b0bf0]	589	if ((block == APR_NONBLOCK_READ) && APR_STATUS_IS_EINTR(status))
[f5a36ee]	590	return APR_EAGAIN;
	591
[401a0de]	592	/* Close TLS session and free resources on EOF,
	593	* gnutls_io_filter_error will add an EOS bucket */
[73b0bf0]	594	if (APR_STATUS_IS_EOF(status))
[401a0de]	595	mgs_bye(ctxt);
	596
[e183628]	597	return gnutls_io_filter_error(f, bb, status);
	598	}
	599
	600	/* Create a transient bucket out of the decrypted data. */
	601	if (len > 0) {
	602	apr_bucket *bucket =
	603	apr_bucket_transient_create(ctxt->input_buffer, len,
	604	f->c->bucket_alloc);
	605	APR_BRIGADE_INSERT_TAIL(bb, bucket);
	606	}
	607
	608	return status;
[dae0aec]	609	}
	610
[e183628]	611	static ssize_t write_flush(mgs_handle_t * ctxt) {
	612	apr_bucket *e;
	613
	614	if (!(ctxt->output_blen \|\| ctxt->output_length)) {
	615	ctxt->output_rc = APR_SUCCESS;
	616	return 1;
	617	}
	618
	619	if (ctxt->output_blen) {
	620	e = apr_bucket_transient_create(ctxt->output_buffer,
	621	ctxt->output_blen,
	622	ctxt->output_bb->
	623	bucket_alloc);
	624	/* we filled this buffer first so add it to the
	625	* * head of the brigade
	626	* */
	627	APR_BRIGADE_INSERT_HEAD(ctxt->output_bb, e);
	628	ctxt->output_blen = 0;
	629	}
	630
	631	ctxt->output_length = 0;
	632	e = apr_bucket_flush_create(ctxt->output_bb->bucket_alloc);
	633	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, e);
	634
	635	ctxt->output_rc = ap_pass_brigade(ctxt->output_filter->next,
	636	ctxt->output_bb);
	637	/* clear the brigade to be ready for next time */
	638	apr_brigade_cleanup(ctxt->output_bb);
	639
	640	return (ctxt->output_rc == APR_SUCCESS) ? 1 : -1;
[485d28e]	641	}
	642
[e183628]	643	apr_status_t mgs_filter_output(ap_filter_t * f, apr_bucket_brigade * bb) {
[fd82e59]	644	int ret;
[e183628]	645	mgs_handle_t ctxt = (mgs_handle_t ) f->ctx;
	646	apr_status_t status = APR_SUCCESS;
	647	apr_read_type_e rblock = APR_NONBLOCK_READ;
[671b64f]	648
[e183628]	649	if (f->c->aborted) {
	650	apr_brigade_cleanup(bb);
	651	return APR_ECONNABORTED;
	652	}
	653
	654	if (ctxt->status == 0) {
[73f6f12]	655	ret = gnutls_do_handshake(ctxt);
	656	if (ret == GNUTLS_E_SUCCESS)
	657	ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctxt->c,
	658	"%s: TLS %sconnection opened.",
	659	__func__, IS_PROXY_STR(ctxt));
[e183628]	660	}
	661
	662	if (ctxt->status < 0) {
	663	return ap_pass_brigade(f->next, bb);
	664	}
	665
	666	while (!APR_BRIGADE_EMPTY(bb)) {
	667	apr_bucket *bucket = APR_BRIGADE_FIRST(bb);
	668
	669	if (APR_BUCKET_IS_EOS(bucket)) {
	670	return ap_pass_brigade(f->next, bb);
[671b64f]	671	} else if (APR_BUCKET_IS_FLUSH(bucket)) {
[e183628]	672	/* Try Flush */
	673	if (write_flush(ctxt) < 0) {
	674	/* Flush Error */
	675	return ctxt->output_rc;
	676	}
	677	/* cleanup! */
[671b64f]	678	apr_bucket_delete(bucket);
[e183628]	679	} else if (AP_BUCKET_IS_EOC(bucket)) {
[401a0de]	680	/* End Of Connection, close TLS session and free
	681	* resources */
	682	mgs_bye(ctxt);
[9a9bc1e]	683	/* cleanup! */
[671b64f]	684	apr_bucket_delete(bucket);
[e183628]	685	/* Pass next brigade! */
	686	return ap_pass_brigade(f->next, bb);
	687	} else {
	688	/* filter output */
	689	const char *data;
	690	apr_size_t len;
	691
[9a9bc1e]	692	status = apr_bucket_read(bucket, &data, &len, rblock);
[e183628]	693
	694	if (APR_STATUS_IS_EAGAIN(status)) {
	695	/* No data available so Flush! */
	696	if (write_flush(ctxt) < 0) {
	697	return ctxt->output_rc;
	698	}
	699	/* Try again with a blocking read. */
	700	rblock = APR_BLOCK_READ;
	701	continue;
	702	}
	703
	704	rblock = APR_NONBLOCK_READ;
	705
	706	if (!APR_STATUS_IS_EOF(status)
	707	&& (status != APR_SUCCESS)) {
	708	return status;
	709	}
	710
	711	if (len > 0) {
	712
	713	if (ctxt->session == NULL) {
	714	ret = GNUTLS_E_INVALID_REQUEST;
[b4a875b]	715	} else {
[e183628]	716	do {
	717	ret =
	718	gnutls_record_send
	719	(ctxt->session, data,
	720	len);
	721	} while (ret == GNUTLS_E_INTERRUPTED
	722	\|\| ret == GNUTLS_E_AGAIN);
	723	}
	724
	725	if (ret < 0) {
	726	/* error sending output */
[7511bfa]	727	ap_log_cerror(APLOG_MARK, APLOG_INFO, ctxt->output_rc,
	728	ctxt->c,
	729	"GnuTLS: Error writing data. (%d) '%s'",
	730	ret, gnutls_strerror(ret));
[e183628]	731	if (ctxt->output_rc == APR_SUCCESS) {
	732	ctxt->output_rc =
	733	APR_EGENERAL;
	734	return ctxt->output_rc;
	735	}
[fd82e59]	736	} else if ((apr_size_t)(ret) != len) {
	737	/* we know the above cast is OK because len > 0 and ret >= 0 */
[671b64f]	738	/* Not able to send the entire bucket,
[e183628]	739	split it and send it again. */
	740	apr_bucket_split(bucket, ret);
	741	}
	742	}
	743
	744	apr_bucket_delete(bucket);
	745	}
	746	}
	747
	748	return status;
[dae0aec]	749	}
	750
[02a6a18]	751	/**
	752	* Pull function for GnuTLS
[a9fa300]	753	*
	754	* Generic errnos used for gnutls_transport_set_errno:
	755	* EIO: Unknown I/O error
	756	* ECONNABORTED: Input BB does not exist (NULL)
	757	*
	758	* The reason we are not using APR_TO_OS_ERROR to map apr_status_t to
	759	* errnos is this warning in the APR documentation: "If the statcode
	760	* was not created by apr_get_os_error or APR_FROM_OS_ERROR, the
	761	* results are undefined." We cannot know if this applies to any error
	762	* we might encounter.
[02a6a18]	763	*/
[c301152]	764	ssize_t mgs_transport_read(gnutls_transport_ptr_t ptr,
[02a6a18]	765	void *buffer, size_t len)
	766	{
[e183628]	767	mgs_handle_t *ctxt = ptr;
	768	apr_status_t rc;
	769	apr_size_t in = len;
	770	apr_read_type_e block = ctxt->input_block;
	771
	772	ctxt->input_rc = APR_SUCCESS;
	773
	774	/* If Len = 0, we don't do anything. */
[19f2719]	775	if (!len \|\| buffer == NULL)
	776	{
[e183628]	777	return 0;
	778	}
[19f2719]	779	/* Input bucket brigade is missing, EOF */
	780	if (!ctxt->input_bb)
	781	{
[e183628]	782	ctxt->input_rc = APR_EOF;
[a9fa300]	783	gnutls_transport_set_errno(ctxt->session, ECONNABORTED);
[e183628]	784	return -1;
	785	}
	786
[19f2719]	787	if (APR_BRIGADE_EMPTY(ctxt->input_bb))
	788	{
[e183628]	789	rc = ap_get_brigade(ctxt->input_filter->next,
[19f2719]	790	ctxt->input_bb, AP_MODE_READBYTES,
	791	ctxt->input_block, in);
[e183628]	792
	793	/* Not a problem, there was simply no data ready yet.
	794	*/
	795	if (APR_STATUS_IS_EAGAIN(rc) \|\| APR_STATUS_IS_EINTR(rc)
[02a6a18]	796	\|\| (rc == APR_SUCCESS
	797	&& APR_BRIGADE_EMPTY(ctxt->input_bb)))
	798	{
	799	if (APR_STATUS_IS_EOF(ctxt->input_rc))
	800	{
[e183628]	801	return 0;
[02a6a18]	802	}
	803	else
	804	{
[6868585]	805	gnutls_transport_set_errno(ctxt->session,
	806	EAI_APR_TO_RAW(ctxt->input_rc));
[e183628]	807	return -1;
	808	}
	809	}
[e02dd8c]	810
[19f2719]	811	if (rc != APR_SUCCESS)
	812	{
[e183628]	813	/* Unexpected errors discard the brigade */
	814	apr_brigade_cleanup(ctxt->input_bb);
	815	ctxt->input_bb = NULL;
[a9fa300]	816	gnutls_transport_set_errno(ctxt->session, EIO);
[e183628]	817	return -1;
	818	}
	819	}
	820
[19f2719]	821	ctxt->input_rc = brigade_consume(ctxt->input_bb, block, buffer, &len);
[e183628]	822
[19f2719]	823	if (ctxt->input_rc == APR_SUCCESS)
	824	{
[e183628]	825	return (ssize_t) len;
	826	}
	827
	828	if (APR_STATUS_IS_EAGAIN(ctxt->input_rc)
[02a6a18]	829	\|\| APR_STATUS_IS_EINTR(ctxt->input_rc))
	830	{
	831	if (len == 0)
	832	{
[6868585]	833	gnutls_transport_set_errno(ctxt->session,
	834	EAI_APR_TO_RAW(ctxt->input_rc));
[e183628]	835	return -1;
[60cf11c]	836	}
[e183628]	837
	838	return (ssize_t) len;
	839	}
	840
	841	/* Unexpected errors and APR_EOF clean out the brigade.
[19f2719]	842	* Subsequent calls will return APR_EOF. */
[e183628]	843	apr_brigade_cleanup(ctxt->input_bb);
	844	ctxt->input_bb = NULL;
	845
[19f2719]	846	if (APR_STATUS_IS_EOF(ctxt->input_rc) && len)
	847	{
	848	/* Some data has been received before EOF, return it. */
[e183628]	849	return (ssize_t) len;
	850	}
	851
[a9fa300]	852	gnutls_transport_set_errno(ctxt->session, EIO);
[e183628]	853	return -1;
[dae0aec]	854	}
	855
[a9fa300]	856	/**
	857	* Push function for GnuTLS
	858	*
	859	* In case of unexpected errors gnutls_transport_set_errno is called
	860	* with EIO. The reason we are not using APR_TO_OS_ERROR to map
	861	* apr_status_t to errnos is this warning in the APR documentation:
	862	* "If the statcode was not created by apr_get_os_error or
	863	* APR_FROM_OS_ERROR, the results are undefined." We cannot know if
	864	* this applies to any error we might encounter.
	865	*/
[c301152]	866	ssize_t mgs_transport_write(gnutls_transport_ptr_t ptr,
[19f2719]	867	const void *buffer, size_t len)
	868	{
[e183628]	869	mgs_handle_t *ctxt = ptr;
	870
	871	/* pass along the encrypted data
	872	* need to flush since we're using SSL's malloc-ed buffer
	873	* which will be overwritten once we leave here
	874	*/
	875	apr_bucket *bucket = apr_bucket_transient_create(buffer, len,
	876	ctxt->output_bb->
	877	bucket_alloc);
	878	ctxt->output_length += len;
	879	APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, bucket);
	880
[be41ee4]	881	if (write_flush(ctxt) < 0)
	882	{
	883	/* We encountered an error. APR_EINTR or APR_EAGAIN can be
	884	* handled, treat everything else as a generic I/O error. */
	885	int err = EIO;
	886	if (APR_STATUS_IS_EAGAIN(ctxt->output_rc)
	887	\|\| APR_STATUS_IS_EINTR(ctxt->output_rc))
	888	err = EAI_APR_TO_RAW(ctxt->output_rc);
	889
	890	gnutls_transport_set_errno(ctxt->session, err);
[e183628]	891	return -1;
	892	}
	893	return len;
[7e2b223]	894	}

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source: mod_gnutls/src/gnutls_io.c @ 04addef

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