contrib/hostapd/src/eap_server/eap_server_tls_common.c

/*
 * EAP-TLS/PEAP/TTLS/FAST server common functions
 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "eap_i.h"
#include "eap_tls_common.h"


static void eap_server_tls_free_in_buf(struct eap_ssl_data *data);


struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
				  u8 code, u8 identifier)
{
	if (type == EAP_UNAUTH_TLS_TYPE)
		return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
				     EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
				     code, identifier);
	return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
			     identifier);
}


int eap_server_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
			    int verify_peer)
{
	if (sm->ssl_ctx == NULL) {
		wpa_printf(MSG_ERROR, "TLS context not initialized - cannot use TLS-based EAP method");
		return -1;
	}

	data->eap = sm;
	data->phase2 = sm->init_phase2;

	data->conn = tls_connection_init(sm->ssl_ctx);
	if (data->conn == NULL) {
		wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
			   "connection");
		return -1;
	}

	if (tls_connection_set_verify(sm->ssl_ctx, data->conn, verify_peer)) {
		wpa_printf(MSG_INFO, "SSL: Failed to configure verification "
			   "of TLS peer certificate");
		tls_connection_deinit(sm->ssl_ctx, data->conn);
		data->conn = NULL;
		return -1;
	}

	data->tls_out_limit = sm->fragment_size > 0 ? sm->fragment_size : 1398;
	if (data->phase2) {
		/* Limit the fragment size in the inner TLS authentication
		 * since the outer authentication with EAP-PEAP does not yet
		 * support fragmentation */
		if (data->tls_out_limit > 100)
			data->tls_out_limit -= 100;
	}
	return 0;
}


void eap_server_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
{
	tls_connection_deinit(sm->ssl_ctx, data->conn);
	eap_server_tls_free_in_buf(data);
	wpabuf_free(data->tls_out);
	data->tls_out = NULL;
}


u8 * eap_server_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
			       char *label, size_t len)
{
	struct tls_keys keys;
	u8 *rnd = NULL, *out;

	out = os_malloc(len);
	if (out == NULL)
		return NULL;

	if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 0, out, len) ==
	    0)
		return out;

	if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
		goto fail;

	if (keys.client_random == NULL || keys.server_random == NULL ||
	    keys.master_key == NULL)
		goto fail;

	rnd = os_malloc(keys.client_random_len + keys.server_random_len);
	if (rnd == NULL)
		goto fail;
	os_memcpy(rnd, keys.client_random, keys.client_random_len);
	os_memcpy(rnd + keys.client_random_len, keys.server_random,
		  keys.server_random_len);

	if (tls_prf_sha1_md5(keys.master_key, keys.master_key_len,
			     label, rnd, keys.client_random_len +
			     keys.server_random_len, out, len))
		goto fail;

	os_free(rnd);
	return out;

fail:
	os_free(out);
	os_free(rnd);
	return NULL;
}


struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
					 int eap_type, int version, u8 id)
{
	struct wpabuf *req;
	u8 flags;
	size_t send_len, plen;

	wpa_printf(MSG_DEBUG, "SSL: Generating Request");
	if (data->tls_out == NULL) {
		wpa_printf(MSG_ERROR, "SSL: tls_out NULL in %s", __func__);
		return NULL;
	}

	flags = version;
	send_len = wpabuf_len(data->tls_out) - data->tls_out_pos;
	if (1 + send_len > data->tls_out_limit) {
		send_len = data->tls_out_limit - 1;
		flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
		if (data->tls_out_pos == 0) {
			flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
			send_len -= 4;
		}
	}

	plen = 1 + send_len;
	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
		plen += 4;

	req = eap_tls_msg_alloc(eap_type, plen, EAP_CODE_REQUEST, id);
	if (req == NULL)
		return NULL;

	wpabuf_put_u8(req, flags); /* Flags */
	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
		wpabuf_put_be32(req, wpabuf_len(data->tls_out));

	wpabuf_put_data(req, wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
			send_len);
	data->tls_out_pos += send_len;

	if (data->tls_out_pos == wpabuf_len(data->tls_out)) {
		wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
			   "(message sent completely)",
			   (unsigned long) send_len);
		wpabuf_free(data->tls_out);
		data->tls_out = NULL;
		data->tls_out_pos = 0;
		data->state = MSG;
	} else {
		wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
			   "(%lu more to send)", (unsigned long) send_len,
			   (unsigned long) wpabuf_len(data->tls_out) -
			   data->tls_out_pos);
		data->state = WAIT_FRAG_ACK;
	}

	return req;
}


struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int version)
{
	struct wpabuf *req;

	req = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_REQUEST, id);
	if (req == NULL)
		return NULL;
	wpa_printf(MSG_DEBUG, "SSL: Building ACK");
	wpabuf_put_u8(req, version); /* Flags */
	return req;
}


static int eap_server_tls_process_cont(struct eap_ssl_data *data,
				       const u8 *buf, size_t len)
{
	/* Process continuation of a pending message */
	if (len > wpabuf_tailroom(data->tls_in)) {
		wpa_printf(MSG_DEBUG, "SSL: Fragment overflow");
		return -1;
	}

	wpabuf_put_data(data->tls_in, buf, len);
	wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes, waiting for %lu "
		   "bytes more", (unsigned long) len,
		   (unsigned long) wpabuf_tailroom(data->tls_in));

	return 0;
}


static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
					   u8 flags, u32 message_length,
					   const u8 *buf, size_t len)
{
	/* Process a fragment that is not the last one of the message */
	if (data->tls_in == NULL && !(flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
		wpa_printf(MSG_DEBUG, "SSL: No Message Length field in a "
			   "fragmented packet");
		return -1;
	}

	if (data->tls_in == NULL) {
		/* First fragment of the message */

		/* Limit length to avoid rogue peers from causing large
		 * memory allocations. */
		if (message_length > 65536) {
			wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
				   " over 64 kB)");
			return -1;
		}

		if (len > message_length) {
			wpa_printf(MSG_INFO, "SSL: Too much data (%d bytes) in "
				   "first fragment of frame (TLS Message "
				   "Length %d bytes)",
				   (int) len, (int) message_length);
			return -1;
		}

		data->tls_in = wpabuf_alloc(message_length);
		if (data->tls_in == NULL) {
			wpa_printf(MSG_DEBUG, "SSL: No memory for message");
			return -1;
		}
		wpabuf_put_data(data->tls_in, buf, len);
		wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes in first "
			   "fragment, waiting for %lu bytes more",
			   (unsigned long) len,
			   (unsigned long) wpabuf_tailroom(data->tls_in));
	}

	return 0;
}


int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data)
{
	if (data->tls_out) {
		/* This should not happen.. */
		wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
			   "processing new message");
		wpabuf_free(data->tls_out);
		WPA_ASSERT(data->tls_out == NULL);
	}

	data->tls_out = tls_connection_server_handshake(sm->ssl_ctx,
							data->conn,
							data->tls_in, NULL);
	if (data->tls_out == NULL) {
		wpa_printf(MSG_INFO, "SSL: TLS processing failed");
		return -1;
	}
	if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
		/* TLS processing has failed - return error */
		wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
			   "report error");
		return -1;
	}

	return 0;
}


static int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
				     const u8 **pos, size_t *left)
{
	unsigned int tls_msg_len = 0;
	const u8 *end = *pos + *left;

	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
		if (*left < 4) {
			wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
				   "length");
			return -1;
		}
		tls_msg_len = WPA_GET_BE32(*pos);
		wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
			   tls_msg_len);
		*pos += 4;
		*left -= 4;

		if (*left > tls_msg_len) {
			wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
				   "bytes) smaller than this fragment (%d "
				   "bytes)", (int) tls_msg_len, (int) *left);
			return -1;
		}
	}

	wpa_printf(MSG_DEBUG, "SSL: Received packet: Flags 0x%x "
		   "Message Length %u", flags, tls_msg_len);

	if (data->state == WAIT_FRAG_ACK) {
		if (*left != 0) {
			wpa_printf(MSG_DEBUG, "SSL: Unexpected payload in "
				   "WAIT_FRAG_ACK state");
			return -1;
		}
		wpa_printf(MSG_DEBUG, "SSL: Fragment acknowledged");
		return 1;
	}

	if (data->tls_in &&
	    eap_server_tls_process_cont(data, *pos, end - *pos) < 0)
		return -1;

	if (flags & EAP_TLS_FLAGS_MORE_FRAGMENTS) {
		if (eap_server_tls_process_fragment(data, flags, tls_msg_len,
						    *pos, end - *pos) < 0)
			return -1;

		data->state = FRAG_ACK;
		return 1;
	}

	if (data->state == FRAG_ACK) {
		wpa_printf(MSG_DEBUG, "SSL: All fragments received");
		data->state = MSG;
	}

	if (data->tls_in == NULL) {
		/* Wrap unfragmented messages as wpabuf without extra copy */
		wpabuf_set(&data->tmpbuf, *pos, end - *pos);
		data->tls_in = &data->tmpbuf;
	}

	return 0;
}


static void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
{
	if (data->tls_in != &data->tmpbuf)
		wpabuf_free(data->tls_in);
	data->tls_in = NULL;
}


struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
				       struct eap_ssl_data *data,
				       const struct wpabuf *plain)
{
	struct wpabuf *buf;

	buf = tls_connection_encrypt(sm->ssl_ctx, data->conn,
				     plain);
	if (buf == NULL) {
		wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
		return NULL;
	}

	return buf;
}


int eap_server_tls_process(struct eap_sm *sm, struct eap_ssl_data *data,
			   struct wpabuf *respData, void *priv, int eap_type,
			   int (*proc_version)(struct eap_sm *sm, void *priv,
					       int peer_version),
			   void (*proc_msg)(struct eap_sm *sm, void *priv,
					    const struct wpabuf *respData))
{
	const u8 *pos;
	u8 flags;
	size_t left;
	int ret, res = 0;

	if (eap_type == EAP_UNAUTH_TLS_TYPE)
		pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
				       EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
				       &left);
	else
		pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, respData,
				       &left);
	if (pos == NULL || left < 1)
		return 0; /* Should not happen - frame already validated */
	flags = *pos++;
	left--;
	wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - Flags 0x%02x",
		   (unsigned long) wpabuf_len(respData), flags);

	if (proc_version &&
	    proc_version(sm, priv, flags & EAP_TLS_VERSION_MASK) < 0)
		return -1;

	ret = eap_server_tls_reassemble(data, flags, &pos, &left);
	if (ret < 0) {
		res = -1;
		goto done;
	} else if (ret == 1)
		return 0;

	if (proc_msg)
		proc_msg(sm, priv, respData);

	if (tls_connection_get_write_alerts(sm->ssl_ctx, data->conn) > 1) {
		wpa_printf(MSG_INFO, "SSL: Locally detected fatal error in "
			   "TLS processing");
		res = -1;
	}

done:
	eap_server_tls_free_in_buf(data);

	return res;
}
Commit	Line	Data
	1	/*
	2	* EAP-TLS/PEAP/TTLS/FAST server common functions
	3	* Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
	4	*
	5	* This software may be distributed under the terms of the BSD license.
	6	* See README for more details.
	7	*/
	8
	9	#include "includes.h"
	10
	11	#include "common.h"
	12	#include "crypto/sha1.h"
	13	#include "crypto/tls.h"
	14	#include "eap_i.h"
	15	#include "eap_tls_common.h"
	16
	17
	18	static void eap_server_tls_free_in_buf(struct eap_ssl_data *data);
	19
	20
	21	struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
	22	u8 code, u8 identifier)
	23	{
	24	if (type == EAP_UNAUTH_TLS_TYPE)
	25	return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
	26	EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
	27	code, identifier);
	28	return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
	29	identifier);
	30	}
	31
	32
	33	int eap_server_tls_ssl_init(struct eap_sm sm, struct eap_ssl_data data,
	34	int verify_peer)
	35	{
	36	if (sm->ssl_ctx == NULL) {
	37	wpa_printf(MSG_ERROR, "TLS context not initialized - cannot use TLS-based EAP method");
	38	return -1;
	39	}
	40
	41	data->eap = sm;
	42	data->phase2 = sm->init_phase2;
	43
	44	data->conn = tls_connection_init(sm->ssl_ctx);
	45	if (data->conn == NULL) {
	46	wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
	47	"connection");
	48	return -1;
	49	}
	50
	51	if (tls_connection_set_verify(sm->ssl_ctx, data->conn, verify_peer)) {
	52	wpa_printf(MSG_INFO, "SSL: Failed to configure verification "
	53	"of TLS peer certificate");
	54	tls_connection_deinit(sm->ssl_ctx, data->conn);
	55	data->conn = NULL;
	56	return -1;
	57	}
	58
	59	data->tls_out_limit = sm->fragment_size > 0 ? sm->fragment_size : 1398;
	60	if (data->phase2) {
	61	/* Limit the fragment size in the inner TLS authentication
	62	* since the outer authentication with EAP-PEAP does not yet
	63	* support fragmentation */
	64	if (data->tls_out_limit > 100)
	65	data->tls_out_limit -= 100;
	66	}
	67	return 0;
	68	}
	69
	70
	71	void eap_server_tls_ssl_deinit(struct eap_sm sm, struct eap_ssl_data data)
	72	{
	73	tls_connection_deinit(sm->ssl_ctx, data->conn);
	74	eap_server_tls_free_in_buf(data);
	75	wpabuf_free(data->tls_out);
	76	data->tls_out = NULL;
	77	}
	78
	79
	80	u8 * eap_server_tls_derive_key(struct eap_sm sm, struct eap_ssl_data data,
	81	char *label, size_t len)
	82	{
	83	struct tls_keys keys;
	84	u8 rnd = NULL, out;
	85
	86	out = os_malloc(len);
	87	if (out == NULL)
	88	return NULL;
	89
	90	if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 0, out, len) ==
	91	0)
	92	return out;
	93
	94	if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
	95	goto fail;
	96
	97	if (keys.client_random == NULL \|\| keys.server_random == NULL \|\|
	98	keys.master_key == NULL)
	99	goto fail;
	100
	101	rnd = os_malloc(keys.client_random_len + keys.server_random_len);
	102	if (rnd == NULL)
	103	goto fail;
	104	os_memcpy(rnd, keys.client_random, keys.client_random_len);
	105	os_memcpy(rnd + keys.client_random_len, keys.server_random,
	106	keys.server_random_len);
	107
	108	if (tls_prf_sha1_md5(keys.master_key, keys.master_key_len,
	109	label, rnd, keys.client_random_len +
	110	keys.server_random_len, out, len))
	111	goto fail;
	112
	113	os_free(rnd);
	114	return out;
	115
	116	fail:
	117	os_free(out);
	118	os_free(rnd);
	119	return NULL;
	120	}
	121
	122
	123	struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
	124	int eap_type, int version, u8 id)
	125	{
	126	struct wpabuf *req;
	127	u8 flags;
	128	size_t send_len, plen;
	129
	130	wpa_printf(MSG_DEBUG, "SSL: Generating Request");
	131	if (data->tls_out == NULL) {
	132	wpa_printf(MSG_ERROR, "SSL: tls_out NULL in %s", __func__);
	133	return NULL;
	134	}
	135
	136	flags = version;
	137	send_len = wpabuf_len(data->tls_out) - data->tls_out_pos;
	138	if (1 + send_len > data->tls_out_limit) {
	139	send_len = data->tls_out_limit - 1;
	140	flags \|= EAP_TLS_FLAGS_MORE_FRAGMENTS;
	141	if (data->tls_out_pos == 0) {
	142	flags \|= EAP_TLS_FLAGS_LENGTH_INCLUDED;
	143	send_len -= 4;
	144	}
	145	}
	146
	147	plen = 1 + send_len;
	148	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
	149	plen += 4;
	150
	151	req = eap_tls_msg_alloc(eap_type, plen, EAP_CODE_REQUEST, id);
	152	if (req == NULL)
	153	return NULL;
	154
	155	wpabuf_put_u8(req, flags); /* Flags */
	156	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
	157	wpabuf_put_be32(req, wpabuf_len(data->tls_out));
	158
	159	wpabuf_put_data(req, wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
	160	send_len);
	161	data->tls_out_pos += send_len;
	162
	163	if (data->tls_out_pos == wpabuf_len(data->tls_out)) {
	164	wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
	165	"(message sent completely)",
	166	(unsigned long) send_len);
	167	wpabuf_free(data->tls_out);
	168	data->tls_out = NULL;
	169	data->tls_out_pos = 0;
	170	data->state = MSG;
	171	} else {
	172	wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
	173	"(%lu more to send)", (unsigned long) send_len,
	174	(unsigned long) wpabuf_len(data->tls_out) -
	175	data->tls_out_pos);
	176	data->state = WAIT_FRAG_ACK;
	177	}
	178
	179	return req;
	180	}
	181
	182
	183	struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int version)
	184	{
	185	struct wpabuf *req;
	186
	187	req = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_REQUEST, id);
	188	if (req == NULL)
	189	return NULL;
	190	wpa_printf(MSG_DEBUG, "SSL: Building ACK");
	191	wpabuf_put_u8(req, version); /* Flags */
	192	return req;
	193	}
	194
	195
	196	static int eap_server_tls_process_cont(struct eap_ssl_data *data,
	197	const u8 *buf, size_t len)
	198	{
	199	/* Process continuation of a pending message */
	200	if (len > wpabuf_tailroom(data->tls_in)) {
	201	wpa_printf(MSG_DEBUG, "SSL: Fragment overflow");
	202	return -1;
	203	}
	204
	205	wpabuf_put_data(data->tls_in, buf, len);
	206	wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes, waiting for %lu "
	207	"bytes more", (unsigned long) len,
	208	(unsigned long) wpabuf_tailroom(data->tls_in));
	209
	210	return 0;
	211	}
	212
	213
	214	static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
	215	u8 flags, u32 message_length,
	216	const u8 *buf, size_t len)
	217	{
	218	/* Process a fragment that is not the last one of the message */
	219	if (data->tls_in == NULL && !(flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
	220	wpa_printf(MSG_DEBUG, "SSL: No Message Length field in a "
	221	"fragmented packet");
	222	return -1;
	223	}
	224
	225	if (data->tls_in == NULL) {
	226	/* First fragment of the message */
	227
	228	/* Limit length to avoid rogue peers from causing large
	229	* memory allocations. */
	230	if (message_length > 65536) {
	231	wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
	232	" over 64 kB)");
	233	return -1;
	234	}
	235
	236	if (len > message_length) {
	237	wpa_printf(MSG_INFO, "SSL: Too much data (%d bytes) in "
	238	"first fragment of frame (TLS Message "
	239	"Length %d bytes)",
	240	(int) len, (int) message_length);
	241	return -1;
	242	}
	243
	244	data->tls_in = wpabuf_alloc(message_length);
	245	if (data->tls_in == NULL) {
	246	wpa_printf(MSG_DEBUG, "SSL: No memory for message");
	247	return -1;
	248	}
	249	wpabuf_put_data(data->tls_in, buf, len);
	250	wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes in first "
	251	"fragment, waiting for %lu bytes more",
	252	(unsigned long) len,
	253	(unsigned long) wpabuf_tailroom(data->tls_in));
	254	}
	255
	256	return 0;
	257	}
	258
	259
	260	int eap_server_tls_phase1(struct eap_sm sm, struct eap_ssl_data data)
	261	{
	262	if (data->tls_out) {
	263	/* This should not happen.. */
	264	wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
	265	"processing new message");
	266	wpabuf_free(data->tls_out);
	267	WPA_ASSERT(data->tls_out == NULL);
	268	}
	269
	270	data->tls_out = tls_connection_server_handshake(sm->ssl_ctx,
	271	data->conn,
	272	data->tls_in, NULL);
	273	if (data->tls_out == NULL) {
	274	wpa_printf(MSG_INFO, "SSL: TLS processing failed");
	275	return -1;
	276	}
	277	if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
	278	/* TLS processing has failed - return error */
	279	wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
	280	"report error");
	281	return -1;
	282	}
	283
	284	return 0;
	285	}
	286
	287
	288	static int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
	289	const u8 *pos, size_t left)
	290	{
	291	unsigned int tls_msg_len = 0;
	292	const u8 end = pos + *left;
	293
	294	if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
	295	if (*left < 4) {
	296	wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
	297	"length");
	298	return -1;
	299	}
	300	tls_msg_len = WPA_GET_BE32(*pos);
	301	wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
	302	tls_msg_len);
	303	*pos += 4;
	304	*left -= 4;
	305
	306	if (*left > tls_msg_len) {
	307	wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
	308	"bytes) smaller than this fragment (%d "
	309	"bytes)", (int) tls_msg_len, (int) *left);
	310	return -1;
	311	}
	312	}
	313
	314	wpa_printf(MSG_DEBUG, "SSL: Received packet: Flags 0x%x "
	315	"Message Length %u", flags, tls_msg_len);
	316
	317	if (data->state == WAIT_FRAG_ACK) {
	318	if (*left != 0) {
	319	wpa_printf(MSG_DEBUG, "SSL: Unexpected payload in "
	320	"WAIT_FRAG_ACK state");
	321	return -1;
	322	}
	323	wpa_printf(MSG_DEBUG, "SSL: Fragment acknowledged");
	324	return 1;
	325	}
	326
	327	if (data->tls_in &&
	328	eap_server_tls_process_cont(data, pos, end - pos) < 0)
	329	return -1;
	330
	331	if (flags & EAP_TLS_FLAGS_MORE_FRAGMENTS) {
	332	if (eap_server_tls_process_fragment(data, flags, tls_msg_len,
	333	pos, end - pos) < 0)
	334	return -1;
	335
	336	data->state = FRAG_ACK;
	337	return 1;
	338	}
	339
	340	if (data->state == FRAG_ACK) {
	341	wpa_printf(MSG_DEBUG, "SSL: All fragments received");
	342	data->state = MSG;
	343	}
	344
	345	if (data->tls_in == NULL) {
	346	/* Wrap unfragmented messages as wpabuf without extra copy */
	347	wpabuf_set(&data->tmpbuf, pos, end - pos);
	348	data->tls_in = &data->tmpbuf;
	349	}
	350
	351	return 0;
	352	}
	353
	354
	355	static void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
	356	{
	357	if (data->tls_in != &data->tmpbuf)
	358	wpabuf_free(data->tls_in);
	359	data->tls_in = NULL;
	360	}
	361
	362
	363	struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
	364	struct eap_ssl_data *data,
	365	const struct wpabuf *plain)
	366	{
	367	struct wpabuf *buf;
	368
	369	buf = tls_connection_encrypt(sm->ssl_ctx, data->conn,
	370	plain);
	371	if (buf == NULL) {
	372	wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
	373	return NULL;
	374	}
	375
	376	return buf;
	377	}
	378
	379
	380	int eap_server_tls_process(struct eap_sm sm, struct eap_ssl_data data,
	381	struct wpabuf respData, void priv, int eap_type,
	382	int (proc_version)(struct eap_sm sm, void *priv,
	383	int peer_version),
	384	void (proc_msg)(struct eap_sm sm, void *priv,
	385	const struct wpabuf *respData))
	386	{
	387	const u8 *pos;
	388	u8 flags;
	389	size_t left;
	390	int ret, res = 0;
	391
	392	if (eap_type == EAP_UNAUTH_TLS_TYPE)
	393	pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
	394	EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
	395	&left);
	396	else
	397	pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, respData,
	398	&left);
	399	if (pos == NULL \|\| left < 1)
	400	return 0; /* Should not happen - frame already validated */
	401	flags = *pos++;
	402	left--;
	403	wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - Flags 0x%02x",
	404	(unsigned long) wpabuf_len(respData), flags);
	405
	406	if (proc_version &&
	407	proc_version(sm, priv, flags & EAP_TLS_VERSION_MASK) < 0)
	408	return -1;
	409
	410	ret = eap_server_tls_reassemble(data, flags, &pos, &left);
	411	if (ret < 0) {
	412	res = -1;
	413	goto done;
	414	} else if (ret == 1)
	415	return 0;
	416
	417	if (proc_msg)
	418	proc_msg(sm, priv, respData);
	419
	420	if (tls_connection_get_write_alerts(sm->ssl_ctx, data->conn) > 1) {
	421	wpa_printf(MSG_INFO, "SSL: Locally detected fatal error in "
	422	"TLS processing");
	423	res = -1;
	424	}
	425
	426	done:
	427	eap_server_tls_free_in_buf(data);
	428
	429	return res;
	430	}