Convert TLS wrapper to use struct wpabuf

This converts tls_connection_handshake(),
tls_connection_server_handshake(), tls_connection_encrypt(), and
tls_connection_decrypt() to use struct wpa_buf to allow higher layer
code to be cleaned up with consistent struct wpabuf use.

src/crypto/tls.h

@@ -1,6 +1,6 @@
 /*
- * WPA Supplicant / SSL/TLS interface definition
+ * SSL/TLS interface definition
- * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -287,17 +287,14 @@ int __must_check  tls_connection_prf(void *tls_ctx,
  * tls_connection_handshake - Process TLS handshake (client side)
  * @tls_ctx: TLS context data from tls_init()
  * @conn: Connection context data from tls_connection_init()
- * @in_data: Input data from TLS peer
+ * @in_data: Input data from TLS server
- * @in_len: Input data length
- * @out_len: Length of the output buffer.
  * @appl_data: Pointer to application data pointer, or %NULL if dropped
- * @appl_data_len: Pointer to variable that is set to appl_data length
+ * Returns: Output data, %NULL on failure
- * Returns: Pointer to output data, %NULL on failure
  *
- * Caller is responsible for freeing returned output data. If the final
+ * The caller is responsible for freeing the returned output data. If the final
  * handshake message includes application data, this is decrypted and
- * appl_data (if not %NULL) is set to point this data. Caller is responsible
+ * appl_data (if not %NULL) is set to point this data. The caller is
- * for freeing appl_data.
+ * responsible for freeing appl_data.
  *
  * This function is used during TLS handshake. The first call is done with
  * in_data == %NULL and the library is expected to return ClientHello packet.
@@ -313,62 +310,55 @@ int __must_check  tls_connection_prf(void *tls_ctx,
  * tls_connection_established() should return 1 once the TLS handshake has been
  * completed successfully.
  */
-u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len);
+					 struct wpabuf **appl_data);
 
 /**
  * tls_connection_server_handshake - Process TLS handshake (server side)
  * @tls_ctx: TLS context data from tls_init()
  * @conn: Connection context data from tls_connection_init()
  * @in_data: Input data from TLS peer
- * @in_len: Input data length
+ * @appl_data: Pointer to application data pointer, or %NULL if dropped
- * @out_len: Length of the output buffer.
+ * Returns: Output data, %NULL on failure
- * Returns: pointer to output data, %NULL on failure
  *
- * Caller is responsible for freeing returned output data.
+ * The caller is responsible for freeing the returned output data.
  */
-u8 * tls_connection_server_handshake(void *tls_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len);
+						struct wpabuf **appl_data);
 
 /**
  * tls_connection_encrypt - Encrypt data into TLS tunnel
  * @tls_ctx: TLS context data from tls_init()
  * @conn: Connection context data from tls_connection_init()
- * @in_data: Pointer to plaintext data to be encrypted
+ * @in_data: Plaintext data to be encrypted
- * @in_len: Input buffer length
+ * Returns: Encrypted TLS data or %NULL on failure
- * @out_data: Pointer to output buffer (encrypted TLS data)
- * @out_len: Maximum out_data length 
- * Returns: Number of bytes written to out_data, -1 on failure
  *
  * This function is used after TLS handshake has been completed successfully to
- * send data in the encrypted tunnel.
+ * send data in the encrypted tunnel. The caller is responsible for freeing the
+ * returned output data.
  */
-int __must_check tls_connection_encrypt(void *tls_ctx,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-					struct tls_connection *conn,
+				       struct tls_connection *conn,
-					const u8 *in_data, size_t in_len,
+				       const struct wpabuf *in_data);
-					u8 *out_data, size_t out_len);
 
 /**
  * tls_connection_decrypt - Decrypt data from TLS tunnel
  * @tls_ctx: TLS context data from tls_init()
  * @conn: Connection context data from tls_connection_init()
- * @in_data: Pointer to input buffer (encrypted TLS data)
+ * @in_data: Encrypted TLS data
- * @in_len: Input buffer length
+ * Returns: Decrypted TLS data or %NULL on failure
- * @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
- * @out_len: Maximum out_data length
- * Returns: Number of bytes written to out_data, -1 on failure
  *
  * This function is used after TLS handshake has been completed successfully to
- * receive data from the encrypted tunnel.
+ * receive data from the encrypted tunnel. The caller is responsible for
+ * freeing the returned output data.
  */
-int __must_check tls_connection_decrypt(void *tls_ctx,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-					struct tls_connection *conn,
+				       struct tls_connection *conn,
-					const u8 *in_data, size_t in_len,
+				       const struct wpabuf *in_data);
-					u8 *out_data, size_t out_len);
 
 /**
  * tls_connection_resumed - Was session resumption used

src/crypto/tls_gnutls.c

@@ -1,6 +1,6 @@
 /*
- * WPA Supplicant / SSL/TLS interface functions for openssl
+ * SSL/TLS interface functions for GnuTLS
- * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -934,31 +934,32 @@ static int tls_connection_verify_peer(struct tls_connection *conn)
 }
 
 
-u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len)
+					 struct wpabuf **appl_data)
 {
-	struct tls_global *global = ssl_ctx;
+	struct tls_global *global = tls_ctx;
-	u8 *out_data;
+	struct wpabuf *out_data;
 	int ret;
 
 	if (appl_data)
 		*appl_data = NULL;
 
-	if (in_data && in_len) {
+	if (in_data && wpabuf_len(in_data) > 0) {
 		if (conn->pull_buf) {
 			wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
 				   "pull_buf", __func__,
 				   (unsigned long) conn->pull_buf_len);
 			os_free(conn->pull_buf);
 		}
-		conn->pull_buf = os_malloc(in_len);
+		conn->pull_buf = os_malloc(wpabuf_len(in_data));
 		if (conn->pull_buf == NULL)
 			return NULL;
-		os_memcpy(conn->pull_buf, in_data, in_len);
+		os_memcpy(conn->pull_buf, wpabuf_head(in_data),
+			  wpabuf_len(in_data));
 		conn->pull_buf_offset = conn->pull_buf;
-		conn->pull_buf_len = in_len;
+		conn->pull_buf_len = wpabuf_len(in_data);
 	}
 
 	ret = gnutls_handshake(conn->session);
@@ -1027,66 +1028,63 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 		}
 	}
 
-	out_data = conn->push_buf;
+	if (conn->push_buf == NULL)
-	*out_len = conn->push_buf_len;
+		return NULL;
+	out_data = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
+	if (out_data == NULL)
+		os_free(conn->push_buf);
 	conn->push_buf = NULL;
 	conn->push_buf_len = 0;
 	return out_data;
 }
 
 
-u8 * tls_connection_server_handshake(void *ssl_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len)
+						struct wpabuf **appl_data)
 {
-	return tls_connection_handshake(ssl_ctx, conn, in_data, in_len,
+	return tls_connection_handshake(tls_ctx, conn, in_data, appl_data);
-					out_len, NULL, NULL);
 }
 
 
-int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 	ssize_t res;
+	struct wpabuf *buf;
 
 #ifdef GNUTLS_IA
 	if (conn->tls_ia)
-		res = gnutls_ia_send(conn->session, (char *) in_data, in_len);
+		res = gnutls_ia_send(conn->session, wpabuf_head(in_data),
+				     wpabuf_len(in_data));
 	else
 #endif /* GNUTLS_IA */
-	res = gnutls_record_send(conn->session, in_data, in_len);
+	res = gnutls_record_send(conn->session, wpabuf_head(in_data),
+				 wpabuf_len(in_data));
 	if (res < 0) {
 		wpa_printf(MSG_INFO, "%s: Encryption failed: %s",
 			   __func__, gnutls_strerror(res));
-		return -1;
+		return NULL;
 	}
 	if (conn->push_buf == NULL)
-		return -1;
+		return NULL;
-	if (conn->push_buf_len < out_len)
+	buf = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
-		out_len = conn->push_buf_len;
+	if (buf == NULL)
-	else if (conn->push_buf_len > out_len) {
+		os_free(conn->push_buf);
-		wpa_printf(MSG_INFO, "GnuTLS: Not enough buffer space for "
-			   "encrypted message (in_len=%lu push_buf_len=%lu "
-			   "out_len=%lu",
-			   (unsigned long) in_len,
-			   (unsigned long) conn->push_buf_len,
-			   (unsigned long) out_len);
-	}
-	os_memcpy(out_data, conn->push_buf, out_len);
-	os_free(conn->push_buf);
 	conn->push_buf = NULL;
 	conn->push_buf_len = 0;
-	return out_len;
+	return buf;
 }
 
 
-int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 	ssize_t res;
+	struct wpabuf *out;
 
 	if (conn->pull_buf) {
 		wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
@@ -1094,20 +1092,29 @@ int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
 			   (unsigned long) conn->pull_buf_len);
 		os_free(conn->pull_buf);
 	}
-	conn->pull_buf = os_malloc(in_len);
+	conn->pull_buf = os_malloc(wpabuf_len(in_data));
 	if (conn->pull_buf == NULL)
-		return -1;
+		return NULL;
-	os_memcpy(conn->pull_buf, in_data, in_len);
+	os_memcpy(conn->pull_buf, wpabuf_head(in_data), wpabuf_len(in_data));
 	conn->pull_buf_offset = conn->pull_buf;
-	conn->pull_buf_len = in_len;
+	conn->pull_buf_len = wpabuf_len(in_data);
+
+	/*
+	 * Even though we try to disable TLS compression, it is possible that
+	 * this cannot be done with all TLS libraries. Add extra buffer space
+	 * to handle the possibility of the decrypted data being longer than
+	 * input data.
+	 */
+	out = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
+	if (out == NULL)
+		return NULL;
 
 #ifdef GNUTLS_IA
 	if (conn->tls_ia) {
-		res = gnutls_ia_recv(conn->session, (char *) out_data,
+		res = gnutls_ia_recv(conn->session, wpabuf_mhead(out),
-				     out_len);
+				     wpabuf_size(out));
-		if (out_len >= 12 &&
+		if (res == GNUTLS_E_WARNING_IA_IPHF_RECEIVED ||
-		    (res == GNUTLS_E_WARNING_IA_IPHF_RECEIVED ||
+		    res == GNUTLS_E_WARNING_IA_FPHF_RECEIVED) {
-		     res == GNUTLS_E_WARNING_IA_FPHF_RECEIVED)) {
 			int final = res == GNUTLS_E_WARNING_IA_FPHF_RECEIVED;
 			wpa_printf(MSG_DEBUG, "%s: Received %sPhaseFinished",
 				   __func__, final ? "Final" : "Intermediate");
@@ -1126,11 +1133,12 @@ int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
 				wpa_printf(MSG_DEBUG, "%s: Failed to permute "
 					   "inner secret: %s",
 					   __func__, gnutls_strerror(res));
-				return -1;
+				wpabuf_free(out);
+				return NULL;
 			}
 
 			res = gnutls_ia_verify_endphase(conn->session,
-							(char *) out_data);
+							wpabuf_head(out));
 			if (res == 0) {
 				wpa_printf(MSG_DEBUG, "%s: Correct endphase "
 					   "checksum", __func__);
@@ -1138,31 +1146,39 @@ int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
 				wpa_printf(MSG_INFO, "%s: Endphase "
 					   "verification failed: %s",
 					   __func__, gnutls_strerror(res));
-				return -1;
+				wpabuf_free(out);
+				return NULL;
 			}
 
 			if (final)
 				conn->final_phase_finished = 1;
 
-			return 0;
+			return out;
 		}
 
 		if (res < 0) {
 			wpa_printf(MSG_DEBUG, "%s - gnutls_ia_recv failed: %d "
 				   "(%s)", __func__, (int) res,
 				   gnutls_strerror(res));
+			wpabuf_free(out);
+			return NULL;
 		}
-		return res;
+		wpabuf_put(out, res);
+		return out;
 	}
 #endif /* GNUTLS_IA */
 
-	res = gnutls_record_recv(conn->session, out_data, out_len);
+	res = gnutls_record_recv(conn->session, wpabuf_mhead(out),
+				 wpabuf_size(out));
 	if (res < 0) {
 		wpa_printf(MSG_DEBUG, "%s - gnutls_record_recv failed: %d "
 			   "(%s)", __func__, (int) res, gnutls_strerror(res));
+		wpabuf_free(out);
+		return NULL;
 	}
+	wpabuf_put(out, res);
 
-	return res;
+	return out;
 }
 
 

src/crypto/tls_internal.c

@@ -1,6 +1,6 @@
 /*
- * WPA Supplicant / TLS interface functions and an internal TLS implementation
+ * TLS interface functions and an internal TLS implementation
- * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -331,45 +331,77 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 }
 
 
-u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len)
+					 struct wpabuf **appl_data)
 {
 #ifdef CONFIG_TLS_INTERNAL_CLIENT
+	u8 *res, *ad;
+	size_t res_len, ad_len;
+	struct wpabuf *out;
+
 	if (conn->client == NULL)
 		return NULL;
 
-	if (appl_data)
+	ad = NULL;
-		*appl_data = NULL;
+	res = tlsv1_client_handshake(conn->client,
+				     in_data ? wpabuf_head(in_data) : NULL,
+				     in_data ? wpabuf_len(in_data) : 0,
+				     &res_len, &ad, &ad_len);
+	if (res == NULL)
+		return NULL;
+	out = wpabuf_alloc_ext_data(res, res_len);
+	if (out == NULL) {
+		os_free(res);
+		os_free(ad);
+		return NULL;
+	}
+	if (appl_data) {
+		if (ad) {
+			*appl_data = wpabuf_alloc_ext_data(ad, ad_len);
+			if (*appl_data == NULL)
+				os_free(ad);
+		} else
+			*appl_data = NULL;
+	} else
+		os_free(ad);
 
-	wpa_printf(MSG_DEBUG, "TLS: %s(in_data=%p in_len=%lu)",
+	return out;
-		   __func__, in_data, (unsigned long) in_len);
-	return tlsv1_client_handshake(conn->client, in_data, in_len, out_len,
-				      appl_data, appl_data_len);
 #else /* CONFIG_TLS_INTERNAL_CLIENT */
 	return NULL;
 #endif /* CONFIG_TLS_INTERNAL_CLIENT */
 }
 
 
-u8 * tls_connection_server_handshake(void *tls_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len)
+						struct wpabuf **appl_data)
 {
 #ifdef CONFIG_TLS_INTERNAL_SERVER
-	u8 *out;
+	u8 *res;
+	size_t res_len;
+	struct wpabuf *out;
+
 	if (conn->server == NULL)
 		return NULL;
 
-	wpa_printf(MSG_DEBUG, "TLS: %s(in_data=%p in_len=%lu)",
+	if (appl_data)
-		   __func__, in_data, (unsigned long) in_len);
+		*appl_data = NULL;
-	out = tlsv1_server_handshake(conn->server, in_data, in_len, out_len);
+
-	if (out == NULL && tlsv1_server_established(conn->server)) {
+	res = tlsv1_server_handshake(conn->server, wpabuf_head(in_data),
-		out = os_malloc(1);
+				     wpabuf_len(in_data), &res_len);
-		*out_len = 0;
+	if (res == NULL && tlsv1_server_established(conn->server))
+		return wpabuf_alloc(0);
+	if (res == NULL)
+		return NULL;
+	out = wpabuf_alloc_ext_data(res, res_len);
+	if (out == NULL) {
+		os_free(res);
+		return NULL;
 	}
+
 	return out;
 #else /* CONFIG_TLS_INTERNAL_SERVER */
 	return NULL;
@@ -377,43 +409,95 @@ u8 * tls_connection_server_handshake(void *tls_ctx,
 }
 
 
-int tls_connection_encrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 #ifdef CONFIG_TLS_INTERNAL_CLIENT
 	if (conn->client) {
-		return tlsv1_client_encrypt(conn->client, in_data, in_len,
+		struct wpabuf *buf;
-					    out_data, out_len);
+		int res;
+		buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
+		if (buf == NULL)
+			return NULL;
+		res = tlsv1_client_encrypt(conn->client, wpabuf_head(in_data),
+					   wpabuf_len(in_data),
+					   wpabuf_mhead(buf),
+					   wpabuf_size(buf));
+		if (res < 0) {
+			wpabuf_free(buf);
+			return NULL;
+		}
+		wpabuf_put(buf, res);
+		return buf;
 	}
 #endif /* CONFIG_TLS_INTERNAL_CLIENT */
 #ifdef CONFIG_TLS_INTERNAL_SERVER
 	if (conn->server) {
-		return tlsv1_server_encrypt(conn->server, in_data, in_len,
+		struct wpabuf *buf;
-					    out_data, out_len);
+		int res;
+		buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
+		if (buf == NULL)
+			return NULL;
+		res = tlsv1_server_encrypt(conn->server, wpabuf_head(in_data),
+					   wpabuf_len(in_data),
+					   wpabuf_mhead(buf),
+					   wpabuf_size(buf));
+		if (res < 0) {
+			wpabuf_free(buf);
+			return NULL;
+		}
+		wpabuf_put(buf, res);
+		return buf;
 	}
 #endif /* CONFIG_TLS_INTERNAL_SERVER */
-	return -1;
+	return NULL;
 }
 
 
-int tls_connection_decrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 #ifdef CONFIG_TLS_INTERNAL_CLIENT
 	if (conn->client) {
-		return tlsv1_client_decrypt(conn->client, in_data, in_len,
+		struct wpabuf *buf;
-					    out_data, out_len);
+		int res;
+		buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
+		if (buf == NULL)
+			return NULL;
+		res = tlsv1_client_decrypt(conn->client, wpabuf_head(in_data),
+					   wpabuf_len(in_data),
+					   wpabuf_mhead(buf),
+					   wpabuf_size(buf));
+		if (res < 0) {
+			wpabuf_free(buf);
+			return NULL;
+		}
+		wpabuf_put(buf, res);
+		return buf;
 	}
 #endif /* CONFIG_TLS_INTERNAL_CLIENT */
 #ifdef CONFIG_TLS_INTERNAL_SERVER
 	if (conn->server) {
-		return tlsv1_server_decrypt(conn->server, in_data, in_len,
+		struct wpabuf *buf;
-					    out_data, out_len);
+		int res;
+		buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
+		if (buf == NULL)
+			return NULL;
+		res = tlsv1_server_decrypt(conn->server, wpabuf_head(in_data),
+					   wpabuf_len(in_data),
+					   wpabuf_mhead(buf),
+					   wpabuf_size(buf));
+		if (res < 0) {
+			wpabuf_free(buf);
+			return NULL;
+		}
+		wpabuf_put(buf, res);
+		return buf;
 	}
 #endif /* CONFIG_TLS_INTERNAL_SERVER */
-	return -1;
+	return NULL;
 }
 
 

src/crypto/tls_none.c

@@ -1,6 +1,6 @@
 /*
- * WPA Supplicant / SSL/TLS interface functions for no TLS case
+ * SSL/TLS interface functions for no TLS case
- * Copyright (c) 2004, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -22,13 +22,12 @@ void * tls_init(const struct tls_config *conf)
 	return (void *) 1;
 }
 
+
 void tls_deinit(void *ssl_ctx)
 {
 }
 
 
-#ifdef EAP_TLS_NONE
-
 int tls_get_errors(void *tls_ctx)
 {
 	return 0;
@@ -107,37 +106,37 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 }
 
 
-u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len)
+					 struct wpabuf **appl_data)
 {
 	return NULL;
 }
 
 
-u8 * tls_connection_server_handshake(void *tls_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len)
+						struct wpabuf **appl_data)
 {
 	return NULL;
 }
 
 
-int tls_connection_encrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
-	return -1;
+	return NULL;
 }
 
 
-int tls_connection_decrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
-	return -1;
+	return NULL;
 }
 
 
@@ -230,5 +229,3 @@ int tls_connection_ia_permute_inner_secret(void *tls_ctx,
 {
 	return -1;
 }
-
-#endif /* EAP_TLS_NONE */

src/crypto/tls_nss.c

@@ -456,32 +456,33 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 }
 
 
-u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len)
+					 struct wpabuf **appl_data)
 {
-	u8 *out_data;
+	struct wpabuf *out_data;
 
 	wpa_printf(MSG_DEBUG, "NSS: handshake: in_len=%u",
-		   (unsigned int) in_len);
+		   in_data ? (unsigned int) wpabuf_len(in_data) : 0);
 
 	if (appl_data)
 		*appl_data = NULL;
 
-	if (in_data && in_len) {
+	if (in_data && wpabuf_len(in_data) > 0) {
 		if (conn->pull_buf) {
 			wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
 				   "pull_buf", __func__,
 				   (unsigned long) conn->pull_buf_len);
 			os_free(conn->pull_buf);
 		}
-		conn->pull_buf = os_malloc(in_len);
+		conn->pull_buf = os_malloc(wpabuf_len(in_data));
 		if (conn->pull_buf == NULL)
 			return NULL;
-		os_memcpy(conn->pull_buf, in_data, in_len);
+		os_memcpy(conn->pull_buf, wpabuf_head(in_data),
+			  wpabuf_len(in_data));
 		conn->pull_buf_offset = conn->pull_buf;
-		conn->pull_buf_len = in_len;
+		conn->pull_buf_len = wpabuf_len(in_data);
 	}
 
 	SSL_ForceHandshake(conn->fd);
@@ -491,79 +492,93 @@ u8 * tls_connection_handshake(void *tls_ctx, struct tls_connection *conn,
 		conn->push_buf = os_malloc(1);
 	}
 
-	out_data = conn->push_buf;
+	if (conn->push_buf == NULL)
-	*out_len = conn->push_buf_len;
+		return NULL;
+	out_data = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
+	if (out_data == NULL)
+		os_free(conn->push_buf);
 	conn->push_buf = NULL;
 	conn->push_buf_len = 0;
 	return out_data;
 }
 
 
-u8 * tls_connection_server_handshake(void *tls_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len)
+						struct wpabuf **appl_data)
 {
 	return NULL;
 }
 
 
-int tls_connection_encrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 	PRInt32 res;
+	struct wpabuf *buf;
 
-	wpa_printf(MSG_DEBUG, "NSS: encrypt %d bytes", (int) in_len);
+	wpa_printf(MSG_DEBUG, "NSS: encrypt %d bytes",
-	res = PR_Send(conn->fd, in_data, in_len, 0, 0);
+		   (int) wpabuf_len(in_data));
+	res = PR_Send(conn->fd, wpabuf_head(in_data), wpabuf_len(in_data), 0,
+		      0);
 	if (res < 0) {
 		wpa_printf(MSG_ERROR, "NSS: Encryption failed");
-		return -1;
+		return NULL;
 	}
 	if (conn->push_buf == NULL)
-		return -1;
+		return NULL;
-	if (conn->push_buf_len < out_len)
+	buf = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
-		out_len = conn->push_buf_len;
+	if (buf == NULL)
-	else if (conn->push_buf_len > out_len) {
+		os_free(conn->push_buf);
-		wpa_printf(MSG_INFO, "NSS: Not enough buffer space for "
-			   "encrypted message (in_len=%lu push_buf_len=%lu "
-			   "out_len=%lu",
-			   (unsigned long) in_len,
-			   (unsigned long) conn->push_buf_len,
-			   (unsigned long) out_len);
-	}
-	os_memcpy(out_data, conn->push_buf, out_len);
-	os_free(conn->push_buf);
 	conn->push_buf = NULL;
 	conn->push_buf_len = 0;
-	return out_len;
+	return buf;
 }
 
 
-int tls_connection_decrypt(void *tls_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 	PRInt32 res;
+	struct wpabuf *out;
 
-	wpa_printf(MSG_DEBUG, "NSS: decrypt %d bytes", (int) in_len);
+	wpa_printf(MSG_DEBUG, "NSS: decrypt %d bytes",
+		   (int) wpabuf_len(in_data));
 	if (conn->pull_buf) {
 		wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
 			   "pull_buf", __func__,
 			   (unsigned long) conn->pull_buf_len);
 		os_free(conn->pull_buf);
 	}
-	conn->pull_buf = os_malloc(in_len);
+	conn->pull_buf = os_malloc(wpabuf_len(in_data));
 	if (conn->pull_buf == NULL)
-		return -1;
+		return NULL;
-	os_memcpy(conn->pull_buf, in_data, in_len);
+	os_memcpy(conn->pull_buf, wpabuf_head(in_data), wpabuf_len(in_data));
 	conn->pull_buf_offset = conn->pull_buf;
-	conn->pull_buf_len = in_len;
+	conn->pull_buf_len = wpabuf_len(in_data);
 
-	res = PR_Recv(conn->fd, out_data, out_len, 0, 0);
+	/*
+	 * Even though we try to disable TLS compression, it is possible that
+	 * this cannot be done with all TLS libraries. Add extra buffer space
+	 * to handle the possibility of the decrypted data being longer than
+	 * input data.
+	 */
+	out = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
+	if (out == NULL)
+		return NULL;
+
+	res = PR_Recv(conn->fd, wpabuf_mhead(out), wpabuf_size(out), 0, 0);
 	wpa_printf(MSG_DEBUG, "NSS: PR_Recv: %d", res);
+	if (res < 0) {
+		wpabuf_free(out);
+		return NULL;
+	}
+	wpabuf_put(out, res);
 
-	return res;
+	return out;
 }
 
 

src/crypto/tls_openssl.c

@@ -1,5 +1,5 @@
 /*
- * WPA Supplicant / SSL/TLS interface functions for openssl
+ * SSL/TLS interface functions for OpenSSL
  * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -1990,30 +1990,30 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 }
 
 
-u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
+static struct wpabuf *
-			      const u8 *in_data, size_t in_len,
+openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
-			      size_t *out_len, u8 **appl_data,
+		  int server)
-			      size_t *appl_data_len)
 {
 	int res;
-	u8 *out_data;
+	struct wpabuf *out_data;
-
-	if (appl_data)
-		*appl_data = NULL;
 
 	/*
 	 * Give TLS handshake data from the server (if available) to OpenSSL
 	 * for processing.
 	 */
 	if (in_data &&
-	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
+	    BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
+	    < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Handshake failed - BIO_write");
 		return NULL;
 	}
 
 	/* Initiate TLS handshake or continue the existing handshake */
-	res = SSL_connect(conn->ssl);
+	if (server)
+		res = SSL_accept(conn->ssl);
+	else
+		res = SSL_connect(conn->ssl);
 	if (res != 1) {
 		int err = SSL_get_error(conn->ssl, res);
 		if (err == SSL_ERROR_WANT_READ)
@@ -2031,7 +2031,7 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 	/* Get the TLS handshake data to be sent to the server */
 	res = BIO_ctrl_pending(conn->ssl_out);
 	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
-	out_data = os_malloc(res == 0 ? 1 : res);
+	out_data = wpabuf_alloc(res);
 	if (out_data == NULL) {
 		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
 			   "handshake output (%d bytes)", res);
@@ -2039,10 +2039,10 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 			tls_show_errors(MSG_INFO, __func__,
 					"BIO_reset failed");
 		}
-		*out_len = 0;
 		return NULL;
 	}
-	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
+	res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
+				      res);
 	if (res < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Handshake failed - BIO_read");
@@ -2050,169 +2050,168 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 			tls_show_errors(MSG_INFO, __func__,
 					"BIO_reset failed");
 		}
-		*out_len = 0;
+		wpabuf_free(out_data);
 		return NULL;
 	}
-	*out_len = res;
+	wpabuf_put(out_data, res);
-
-	if (SSL_is_init_finished(conn->ssl) && appl_data) {
-		*appl_data = os_malloc(in_len);
-		if (*appl_data) {
-			res = SSL_read(conn->ssl, *appl_data, in_len);
-			if (res < 0) {
-				int err = SSL_get_error(conn->ssl, res);
-				if (err == SSL_ERROR_WANT_READ ||
-				    err == SSL_ERROR_WANT_WRITE) {
-					wpa_printf(MSG_DEBUG,
-						   "SSL: No Application Data "
-						   "included");
-				} else {
-					tls_show_errors(MSG_INFO, __func__,
-							"Failed to read "
-							"possible "
-							"Application Data");
-				}
-				os_free(*appl_data);
-				*appl_data = NULL;
-			} else {
-				*appl_data_len = res;
-				wpa_hexdump_key(MSG_MSGDUMP, "SSL: Application"
-						" Data in Finish message",
-						*appl_data, *appl_data_len);
-			}
-		}
-	}
 
 	return out_data;
 }
 
 
-u8 * tls_connection_server_handshake(void *ssl_ctx,
+static struct wpabuf *
-				     struct tls_connection *conn,
+openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
-				     const u8 *in_data, size_t in_len,
-				     size_t *out_len)
 {
+	struct wpabuf *appl_data;
 	int res;
-	u8 *out_data;
 
-	/*
+	appl_data = wpabuf_alloc(max_len + 100);
-	 * Give TLS handshake data from the client (if available) to OpenSSL
+	if (appl_data == NULL)
-	 * for processing.
-	 */
-	if (in_data &&
-	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
-		tls_show_errors(MSG_INFO, __func__,
-				"Handshake failed - BIO_write");
 		return NULL;
-	}
 
-	/* Initiate TLS handshake or continue the existing handshake */
+	res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
-	res = SSL_accept(conn->ssl);
+		       wpabuf_size(appl_data));
-	if (res != 1) {
+	if (res < 0) {
 		int err = SSL_get_error(conn->ssl, res);
-		if (err == SSL_ERROR_WANT_READ)
+		if (err == SSL_ERROR_WANT_READ ||
-			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want "
+		    err == SSL_ERROR_WANT_WRITE) {
-				   "more data");
+			wpa_printf(MSG_DEBUG, "SSL: No Application Data "
-		else if (err == SSL_ERROR_WANT_WRITE)
+				   "included");
-			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want to "
+		} else {
-				   "write");
+			tls_show_errors(MSG_INFO, __func__,
-		else {
+					"Failed to read possible "
-			tls_show_errors(MSG_INFO, __func__, "SSL_accept");
+					"Application Data");
-			return NULL;
 		}
+		wpabuf_free(appl_data);
+		return NULL;
 	}
 
-	/* Get the TLS handshake data to be sent to the client */
+	wpabuf_put(appl_data, res);
-	res = BIO_ctrl_pending(conn->ssl_out);
+	wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
-	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
+			    "message", appl_data);
-	out_data = os_malloc(res == 0 ? 1 : res);
+
-	if (out_data == NULL) {
+	return appl_data;
-		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
+}
-			   "handshake output (%d bytes)", res);
+
-		if (BIO_reset(conn->ssl_out) < 0) {
+
-			tls_show_errors(MSG_INFO, __func__,
+static struct wpabuf *
-					"BIO_reset failed");
+openssl_connection_handshake(struct tls_connection *conn,
-		}
+			     const struct wpabuf *in_data,
-		*out_len = 0;
+			     struct wpabuf **appl_data, int server)
+{
+	struct wpabuf *out_data;
+
+	if (appl_data)
+		*appl_data = NULL;
+
+	out_data = openssl_handshake(conn, in_data, server);
+	if (out_data == NULL)
 		return NULL;
-	}
+
-	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
+	if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
-	if (res < 0) {
+		*appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));
-		tls_show_errors(MSG_INFO, __func__,
+
-				"Handshake failed - BIO_read");
-		if (BIO_reset(conn->ssl_out) < 0) {
-			tls_show_errors(MSG_INFO, __func__,
-					"BIO_reset failed");
-		}
-		*out_len = 0;
-		return NULL;
-	}
-	*out_len = res;
 	return out_data;
 }
 
 
-int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf *
-			   const u8 *in_data, size_t in_len,
+tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+			 const struct wpabuf *in_data,
+			 struct wpabuf **appl_data)
+{
+	return openssl_connection_handshake(conn, in_data, appl_data, 0);
+}
+
+
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
+						struct tls_connection *conn,
+						const struct wpabuf *in_data,
+						struct wpabuf **appl_data)
+{
+	return openssl_connection_handshake(conn, in_data, appl_data, 1);
+}
+
+
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
+				       struct tls_connection *conn,
+				       const struct wpabuf *in_data)
 {
 	int res;
+	struct wpabuf *buf;
 
 	if (conn == NULL)
-		return -1;
+		return NULL;
 
 	/* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
 	if ((res = BIO_reset(conn->ssl_in)) < 0 ||
 	    (res = BIO_reset(conn->ssl_out)) < 0) {
 		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
-		return res;
+		return NULL;
 	}
-	res = SSL_write(conn->ssl, in_data, in_len);
+	res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
 	if (res < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Encryption failed - SSL_write");
-		return res;
+		return NULL;
 	}
 
 	/* Read encrypted data to be sent to the server */
-	res = BIO_read(conn->ssl_out, out_data, out_len);
+	buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
+	if (buf == NULL)
+		return NULL;
+	res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
 	if (res < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Encryption failed - BIO_read");
-		return res;
+		wpabuf_free(buf);
+		return NULL;
 	}
+	wpabuf_put(buf, res);
 
-	return res;
+	return buf;
 }
 
 
-int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
 	int res;
+	struct wpabuf *buf;
 
 	/* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
-	res = BIO_write(conn->ssl_in, in_data, in_len);
+	res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
+			wpabuf_len(in_data));
 	if (res < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Decryption failed - BIO_write");
-		return res;
+		return NULL;
 	}
 	if (BIO_reset(conn->ssl_out) < 0) {
 		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
-		return res;
+		return NULL;
 	}
 
 	/* Read decrypted data for further processing */
-	res = SSL_read(conn->ssl, out_data, out_len);
+	/*
+	 * Even though we try to disable TLS compression, it is possible that
+	 * this cannot be done with all TLS libraries. Add extra buffer space
+	 * to handle the possibility of the decrypted data being longer than
+	 * input data.
+	 */
+	buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
+	if (buf == NULL)
+		return NULL;
+	res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
 	if (res < 0) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Decryption failed - SSL_read");
-		return res;
+		return NULL;
 	}
+	wpabuf_put(buf, res);
 
-	return res;
+	return buf;
 }
 
 

src/crypto/tls_schannel.c

@@ -1,6 +1,6 @@
 /*
- * WPA Supplicant / SSL/TLS interface functions for Microsoft Schannel
+ * SSL/TLS interface functions for Microsoft Schannel
- * Copyright (c) 2005, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -215,9 +215,8 @@ int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
 }
 
 
-static u8 * tls_conn_hs_clienthello(struct tls_global *global,
+static struct wpabuf * tls_conn_hs_clienthello(struct tls_global *global,
-				    struct tls_connection *conn,
+					       struct tls_connection *conn)
-				    size_t *out_len)
 {
 	DWORD sspi_flags, sspi_flags_out;
 	SecBufferDesc outbuf;
@@ -260,15 +259,14 @@ static u8 * tls_conn_hs_clienthello(struct tls_global *global,
 	}
 
 	if (outbufs[0].cbBuffer != 0 && outbufs[0].pvBuffer) {
-		u8 *buf;
+		struct wpabuf *buf;
 		wpa_hexdump(MSG_MSGDUMP, "SChannel - ClientHello",
 			    outbufs[0].pvBuffer, outbufs[0].cbBuffer);
 		conn->start = 0;
-		*out_len = outbufs[0].cbBuffer;
+		buf = wpabuf_alloc_copy(outbufs[0].pvBuffer,
-		buf = os_malloc(*out_len);
+					outbufs[0].cbBuffer);
 		if (buf == NULL)
 			return NULL;
-		os_memcpy(buf, outbufs[0].pvBuffer, *out_len);
 		global->sspi->FreeContextBuffer(outbufs[0].pvBuffer);
 		return buf;
 	}
@@ -316,28 +314,27 @@ static int tls_get_eap(struct tls_global *global, struct tls_connection *conn)
 }
 
 
-u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_handshake(void *tls_ctx,
-			      const u8 *in_data, size_t in_len,
+					 struct tls_connection *conn,
-			      size_t *out_len, u8 **appl_data,
+					 const struct wpabuf *in_data,
-			      size_t *appl_data_len)
+					 struct wpabuf **appl_data)
 {
-	struct tls_global *global = ssl_ctx;
+	struct tls_global *global = tls_ctx;
 	DWORD sspi_flags, sspi_flags_out;
 	SecBufferDesc inbuf, outbuf;
 	SecBuffer inbufs[2], outbufs[1];
 	SECURITY_STATUS status;
 	TimeStamp ts_expiry;
-	u8 *out_buf = NULL;
+	struct wpabuf *out_buf = NULL;
 
 	if (appl_data)
 		*appl_data = NULL;
 
-	if (conn->start) {
+	if (conn->start)
-		return tls_conn_hs_clienthello(global, conn, out_len);
+		return tls_conn_hs_clienthello(global, conn);
-	}
 
 	wpa_printf(MSG_DEBUG, "SChannel: %d bytes handshake data to process",
-		   in_len);
+		   (int) wpabuf_len(in_data));
 
 	sspi_flags = ISC_REQ_REPLAY_DETECT |
 		ISC_REQ_CONFIDENTIALITY |
@@ -346,8 +343,8 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 		ISC_REQ_MANUAL_CRED_VALIDATION;
 
 	/* Input buffer for Schannel */
-	inbufs[0].pvBuffer = (u8 *) in_data;
+	inbufs[0].pvBuffer = (u8 *) wpabuf_head(in_data);
-	inbufs[0].cbBuffer = in_len;
+	inbufs[0].cbBuffer = wpabuf_len(in_data);
 	inbufs[0].BufferType = SECBUFFER_TOKEN;
 
 	/* Place for leftover data from Schannel */
@@ -392,11 +389,8 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 		if (outbufs[0].cbBuffer != 0 && outbufs[0].pvBuffer) {
 			wpa_hexdump(MSG_MSGDUMP, "SChannel - output",
 				    outbufs[0].pvBuffer, outbufs[0].cbBuffer);
-			*out_len = outbufs[0].cbBuffer;
+			out_buf = wpabuf_alloc_copy(outbufs[0].pvBuffer,
-			out_buf = os_malloc(*out_len);
+						    outbufs[0].cbBuffer);
-			if (out_buf)
-				os_memcpy(out_buf, outbufs[0].pvBuffer,
-					  *out_len);
 			global->sspi->FreeContextBuffer(outbufs[0].pvBuffer);
 			outbufs[0].pvBuffer = NULL;
 			if (out_buf == NULL)
@@ -420,19 +414,16 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 
 		/* Need to return something to get final TLS ACK. */
 		if (out_buf == NULL)
-			out_buf = os_malloc(1);
+			out_buf = wpabuf_alloc(0);
 
 		if (inbufs[1].BufferType == SECBUFFER_EXTRA) {
 			wpa_hexdump(MSG_MSGDUMP, "SChannel - Encrypted "
 				    "application data",
 				    inbufs[1].pvBuffer, inbufs[1].cbBuffer);
 			if (appl_data) {
-				*appl_data_len = outbufs[1].cbBuffer;
+				*appl_data = wpabuf_alloc_copy(
-				appl_data = os_malloc(*appl_data_len);
+					outbufs[1].pvBuffer,
-				if (appl_data)
+					outbufs[1].cbBuffer);
-					os_memcpy(appl_data,
-						  outbufs[1].pvBuffer,
-						  *appl_data_len);
 			}
 			global->sspi->FreeContextBuffer(inbufs[1].pvBuffer);
 			inbufs[1].pvBuffer = NULL;
@@ -470,26 +461,26 @@ u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
 }
 
 
-u8 * tls_connection_server_handshake(void *ssl_ctx,
+struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
-				     struct tls_connection *conn,
+						struct tls_connection *conn,
-				     const u8 *in_data, size_t in_len,
+						const struct wpabuf *in_data,
-				     size_t *out_len)
+						struct wpabuf **appl_data)
 {
 	return NULL;
 }
 
 
-int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_encrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
-	struct tls_global *global = ssl_ctx;
+	struct tls_global *global = tls_ctx;
 	SECURITY_STATUS status;
 	SecBufferDesc buf;
 	SecBuffer bufs[4];
 	SecPkgContext_StreamSizes sizes;
 	int i;
-	size_t total_len;
+	struct wpabuf *out;
 
 	status = global->sspi->QueryContextAttributes(&conn->context,
 						      SECPKG_ATTR_STREAM_SIZES,
@@ -497,34 +488,27 @@ int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
 	if (status != SEC_E_OK) {
 		wpa_printf(MSG_DEBUG, "%s: QueryContextAttributes failed",
 			   __func__);
-		return -1;
+		return NULL;
 	}
 	wpa_printf(MSG_DEBUG, "%s: Stream sizes: header=%u trailer=%u",
 		   __func__,
 		   (unsigned int) sizes.cbHeader,
 		   (unsigned int) sizes.cbTrailer);
 
-	total_len = sizes.cbHeader + in_len + sizes.cbTrailer;
+	out = wpabuf_alloc(sizes.cbHeader + wpabuf_len(in_data) +
-
+			   sizes.cbTrailer);
-	if (out_len < total_len) {
-		wpa_printf(MSG_DEBUG, "%s: too short out_data (out_len=%lu "
-			   "in_len=%lu total_len=%lu)", __func__,
-			   (unsigned long) out_len, (unsigned long) in_len,
-			   (unsigned long) total_len);
-		return -1;
-	}
 
 	os_memset(&bufs, 0, sizeof(bufs));
-	bufs[0].pvBuffer = out_data;
+	bufs[0].pvBuffer = wpabuf_put(out, sizes.cbHeader);
 	bufs[0].cbBuffer = sizes.cbHeader;
 	bufs[0].BufferType = SECBUFFER_STREAM_HEADER;
 
-	os_memcpy(out_data + sizes.cbHeader, in_data, in_len);
+	bufs[1].pvBuffer = wpabuf_put(out, 0);
-	bufs[1].pvBuffer = out_data + sizes.cbHeader;
+	wpabuf_put_buf(out, in_data);
-	bufs[1].cbBuffer = in_len;
+	bufs[1].cbBuffer = wpabuf_len(in_data);
 	bufs[1].BufferType = SECBUFFER_DATA;
 
-	bufs[2].pvBuffer = out_data + sizes.cbHeader + in_len;
+	bufs[2].pvBuffer = wpabuf_put(out, sizes.cbTrailer);
 	bufs[2].cbBuffer = sizes.cbTrailer;
 	bufs[2].BufferType = SECBUFFER_STREAM_TRAILER;
 
@@ -543,7 +527,7 @@ int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
 		   (int) bufs[2].cbBuffer, (int) bufs[2].BufferType);
 	wpa_printf(MSG_MSGDUMP, "Schannel: EncryptMessage pointers: "
 		   "out_data=%p bufs %p %p %p",
-		   out_data, bufs[0].pvBuffer, bufs[1].pvBuffer,
+		   wpabuf_head(out), bufs[0].pvBuffer, bufs[1].pvBuffer,
 		   bufs[2].pvBuffer);
 
 	for (i = 0; i < 3; i++) {
@@ -556,39 +540,37 @@ int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
 
 	if (status == SEC_E_OK) {
 		wpa_printf(MSG_DEBUG, "%s: SEC_E_OK", __func__);
-		wpa_hexdump_key(MSG_MSGDUMP, "Schannel: Encrypted data from "
+		wpa_hexdump_buf_key(MSG_MSGDUMP, "Schannel: Encrypted data "
-				"EncryptMessage", out_data, total_len);
+				    "from EncryptMessage", out);
-		return total_len;
+		return out;
 	}
 
 	wpa_printf(MSG_DEBUG, "%s: Failed - status=%d",
 		   __func__, (int) status);
-	return -1;
+	wpabuf_free(out);
+	return NULL;
 }
 
 
-int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
+struct wpabuf * tls_connection_decrypt(void *tls_ctx,
-			   const u8 *in_data, size_t in_len,
+				       struct tls_connection *conn,
-			   u8 *out_data, size_t out_len)
+				       const struct wpabuf *in_data)
 {
-	struct tls_global *global = ssl_ctx;
+	struct tls_global *global = tls_ctx;
 	SECURITY_STATUS status;
 	SecBufferDesc buf;
 	SecBuffer bufs[4];
 	int i;
+	struct wpabuf *out, *tmp;
 
-	if (out_len < in_len) {
+	wpa_hexdump_buf(MSG_MSGDUMP,
-		wpa_printf(MSG_DEBUG, "%s: out_len=%lu < in_len=%lu", __func__,
+			"Schannel: Encrypted data to DecryptMessage", in_data);
-			   (unsigned long) out_len, (unsigned long) in_len);
-		return -1;
-	}
-
-	wpa_hexdump(MSG_MSGDUMP, "Schannel: Encrypted data to DecryptMessage",
-		    in_data, in_len);
 	os_memset(&bufs, 0, sizeof(bufs));
-	os_memcpy(out_data, in_data, in_len);
+	tmp = wpabuf_dup(in_data);
-	bufs[0].pvBuffer = out_data;
+	if (tmp == NULL)
-	bufs[0].cbBuffer = in_len;
+		return NULL;
+	bufs[0].pvBuffer = wpabuf_mhead(tmp);
+	bufs[0].cbBuffer = wpabuf_len(in_data);
 	bufs[0].BufferType = SECBUFFER_DATA;
 
 	bufs[1].BufferType = SECBUFFER_EMPTY;
@@ -611,7 +593,7 @@ int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
 		   (int) bufs[3].cbBuffer, (int) bufs[3].BufferType);
 	wpa_printf(MSG_MSGDUMP, "Schannel: DecryptMessage pointers: "
 		   "out_data=%p bufs %p %p %p %p",
-		   out_data, bufs[0].pvBuffer, bufs[1].pvBuffer,
+		   wpabuf_head(tmp), bufs[0].pvBuffer, bufs[1].pvBuffer,
 		   bufs[2].pvBuffer, bufs[3].pvBuffer);
 
 	switch (status) {
@@ -628,23 +610,21 @@ int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
 		if (i == 4) {
 			wpa_printf(MSG_DEBUG, "%s: No output data from "
 				   "DecryptMessage", __func__);
-			return -1;
+			wpabuf_free(tmp);
+			return NULL;
 		}
 		wpa_hexdump_key(MSG_MSGDUMP, "Schannel: Decrypted data from "
 				"DecryptMessage",
 				bufs[i].pvBuffer, bufs[i].cbBuffer);
-		if (bufs[i].cbBuffer > out_len) {
+		out = wpabuf_alloc_copy(bufs[i].pvBuffer, bufs[i].cbBuffer);
-			wpa_printf(MSG_DEBUG, "%s: Too long output data",
+		wpabuf_free(tmp);
-				   __func__);
+		return out;
-			return -1;
-		}
-		os_memmove(out_data, bufs[i].pvBuffer, bufs[i].cbBuffer);
-		return bufs[i].cbBuffer;
 	}
 
 	wpa_printf(MSG_DEBUG, "%s: Failed - status=%d",
 		   __func__, (int) status);
-	return -1;
+	wpabuf_free(tmp);
+	return NULL;
 }
 
 

src/eap_peer/eap_tls_common.c

@@ -1,6 +1,6 @@
 /*
  * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
- * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -296,27 +296,29 @@ fail:
  * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
  * @data: Data for TLS processing
  * @in_data: Next incoming TLS segment
- * @in_len: Length of in_data
  * Returns: 0 on success, 1 if more data is needed for the full message, or
  * -1 on error
  */
 static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
-					    const u8 *in_data, size_t in_len)
+					    const struct wpabuf *in_data)
 {
-	u8 *buf;
+	size_t tls_in_len, in_len;
 
-	if (data->tls_in_len + in_len == 0) {
+	tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
+	in_len = in_data ? wpabuf_len(in_data) : 0;
+
+	if (tls_in_len + in_len == 0) {
 		/* No message data received?! */
 		wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
 			   "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
 			   (unsigned long) data->tls_in_left,
-			   (unsigned long) data->tls_in_len,
+			   (unsigned long) tls_in_len,
 			   (unsigned long) in_len);
 		eap_peer_tls_reset_input(data);
 		return -1;
 	}
 
-	if (data->tls_in_len + in_len > 65536) {
+	if (tls_in_len + in_len > 65536) {
 		/*
 		 * Limit length to avoid rogue servers from causing large
 		 * memory allocations.
@@ -335,16 +337,13 @@ static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
 		return -1;
 	}
 
-	buf = os_realloc(data->tls_in, data->tls_in_len + in_len);
+	if (wpabuf_resize(&data->tls_in, in_len) < 0) {
-	if (buf == NULL) {
 		wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
 			   "data");
 		eap_peer_tls_reset_input(data);
 		return -1;
 	}
-	os_memcpy(buf + data->tls_in_len, in_data, in_len);
+	wpabuf_put_buf(data->tls_in, in_data);
-	data->tls_in = buf;
-	data->tls_in_len += in_len;
 	data->tls_in_left -= in_len;
 
 	if (data->tls_in_left > 0) {
@@ -361,8 +360,6 @@ static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
  * eap_peer_tls_data_reassemble - Reassemble TLS data
  * @data: Data for TLS processing
  * @in_data: Next incoming TLS segment
- * @in_len: Length of in_data
- * @out_len: Variable for returning length of the reassembled message
  * @need_more_input: Variable for returning whether more input data is needed
  * to reassemble this TLS packet
  * Returns: Pointer to output data, %NULL on error or when more data is needed
@@ -371,16 +368,15 @@ static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
  * This function reassembles TLS fragments. Caller must not free the returned
  * data buffer since an internal pointer to it is maintained.
  */
-const u8 * eap_peer_tls_data_reassemble(
+static const struct wpabuf * eap_peer_tls_data_reassemble(
-	struct eap_ssl_data *data, const u8 *in_data, size_t in_len,
+	struct eap_ssl_data *data, const struct wpabuf *in_data,
-	size_t *out_len, int *need_more_input)
+	int *need_more_input)
 {
 	*need_more_input = 0;
 
-	if (data->tls_in_left > in_len || data->tls_in) {
+	if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
 		/* Message has fragments */
-		int res = eap_peer_tls_reassemble_fragment(data, in_data,
+		int res = eap_peer_tls_reassemble_fragment(data, in_data);
-							   in_len);
 		if (res) {
 			if (res == 1)
 				*need_more_input = 1;
@@ -391,14 +387,11 @@ const u8 * eap_peer_tls_data_reassemble(
 	} else {
 		/* No fragments in this message, so just make a copy of it. */
 		data->tls_in_left = 0;
-		data->tls_in = os_malloc(in_len ? in_len : 1);
+		data->tls_in = wpabuf_dup(in_data);
 		if (data->tls_in == NULL)
 			return NULL;
-		os_memcpy(data->tls_in, in_data, in_len);
-		data->tls_in_len = in_len;
 	}
 
-	*out_len = data->tls_in_len;
 	return data->tls_in;
 }
 
@@ -417,14 +410,13 @@ static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
 				 const u8 *in_data, size_t in_len,
 				 struct wpabuf **out_data)
 {
-	const u8 *msg;
+	const struct wpabuf *msg;
-	size_t msg_len;
 	int need_more_input;
-	u8 *appl_data;
+	struct wpabuf *appl_data;
-	size_t appl_data_len;
+	struct wpabuf buf;
 
-	msg = eap_peer_tls_data_reassemble(data, in_data, in_len,
+	wpabuf_set(&buf, in_data, in_len);
-					   &msg_len, &need_more_input);
+	msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input);
 	if (msg == NULL)
 		return need_more_input ? 1 : -1;
 
@@ -433,31 +425,25 @@ static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
 		/* This should not happen.. */
 		wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
 			   "tls_out data even though tls_out_len = 0");
-		os_free(data->tls_out);
+		wpabuf_free(data->tls_out);
 		WPA_ASSERT(data->tls_out == NULL);
 	}
 	appl_data = NULL;
 	data->tls_out = tls_connection_handshake(sm->ssl_ctx, data->conn,
-						 msg, msg_len,
+						 msg, &appl_data);
-						 &data->tls_out_len,
-						 &appl_data, &appl_data_len);
 
 	eap_peer_tls_reset_input(data);
 
 	if (appl_data &&
 	    tls_connection_established(sm->ssl_ctx, data->conn) &&
 	    !tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
-		wpa_hexdump_key(MSG_MSGDUMP, "SSL: Application data",
+		wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
-				appl_data, appl_data_len);
+				    appl_data);
-		*out_data = wpabuf_alloc_ext_data(appl_data, appl_data_len);
+		*out_data = appl_data;
-		if (*out_data == NULL) {
-			os_free(appl_data);
-			return -1;
-		}
 		return 2;
 	}
 
-	os_free(appl_data);
+	wpabuf_free(appl_data);
 
 	return 0;
 }
@@ -480,11 +466,14 @@ static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
 	size_t len;
 	u8 *flags;
 	int more_fragments, length_included;
-	
+
-	len = data->tls_out_len - data->tls_out_pos;
+	if (data->tls_out == NULL)
+		return -1;
+	len = wpabuf_len(data->tls_out) - data->tls_out_pos;
 	wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
 		   "%lu bytes)",
-		   (unsigned long) len, (unsigned long) data->tls_out_len);
+		   (unsigned long) len,
+		   (unsigned long) wpabuf_len(data->tls_out));
 
 	/*
 	 * Limit outgoing message to the configured maximum size. Fragment
@@ -499,7 +488,7 @@ static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
 		more_fragments = 0;
 
 	length_included = data->tls_out_pos == 0 &&
-		(data->tls_out_len > data->tls_out_limit ||
+		(wpabuf_len(data->tls_out) > data->tls_out_limit ||
 		 data->include_tls_length);
 	if (!length_included &&
 	    eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
@@ -525,10 +514,12 @@ static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
 		*flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
 	if (length_included) {
 		*flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
-		wpabuf_put_be32(*out_data, data->tls_out_len);
+		wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
 	}
 
-	wpabuf_put_data(*out_data, &data->tls_out[data->tls_out_pos], len);
+	wpabuf_put_data(*out_data,
+			wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
+			len);
 	data->tls_out_pos += len;
 
 	if (!more_fragments)
@@ -576,13 +567,13 @@ int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 
 	*out_data = NULL;
 
-	if (data->tls_out_len > 0 && in_len > 0) {
+	if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) {
 		wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
 			   "fragments are waiting to be sent out");
 		return -1;
 	}
 
-	if (data->tls_out_len == 0) {
+	if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
 		/*
 		 * No more data to send out - expect to receive more data from
 		 * the AS.
@@ -621,14 +612,14 @@ int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 		/* TODO: clean pin if engine used? */
 	}
 
-	if (data->tls_out_len == 0) {
+	if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
 		/*
 		 * TLS negotiation should now be complete since all other cases
 		 * needing more data should have been caught above based on
 		 * the TLS Message Length field.
 		 */
 		wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
-		os_free(data->tls_out);
+		wpabuf_free(data->tls_out);
 		data->tls_out = NULL;
 		return 1;
 	}
@@ -780,9 +771,8 @@ const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
 		if (data->tls_in_left == 0) {
 			data->tls_in_total = tls_msg_len;
 			data->tls_in_left = tls_msg_len;
-			os_free(data->tls_in);
+			wpabuf_free(data->tls_in);
 			data->tls_in = NULL;
-			data->tls_in_len = 0;
 		}
 		pos += 4;
 		left -= 4;
@@ -807,8 +797,8 @@ const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
  */
 void eap_peer_tls_reset_input(struct eap_ssl_data *data)
 {
-	data->tls_in_left = data->tls_in_total = data->tls_in_len = 0;
+	data->tls_in_left = data->tls_in_total = 0;
-	os_free(data->tls_in);
+	wpabuf_free(data->tls_in);
 	data->tls_in = NULL;
 }
 
@@ -822,9 +812,8 @@ void eap_peer_tls_reset_input(struct eap_ssl_data *data)
  */
 void eap_peer_tls_reset_output(struct eap_ssl_data *data)
 {
-	data->tls_out_len = 0;
 	data->tls_out_pos = 0;
-	os_free(data->tls_out);
+	wpabuf_free(data->tls_out);
 	data->tls_out = NULL;
 }
 
@@ -841,44 +830,19 @@ int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
 			 const struct wpabuf *in_data,
 			 struct wpabuf **in_decrypted)
 {
-	int res;
+	const struct wpabuf *msg;
-	const u8 *msg;
-	size_t msg_len, buf_len;
 	int need_more_input;
 
-	msg = eap_peer_tls_data_reassemble(data, wpabuf_head(in_data),
+	msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
-					   wpabuf_len(in_data), &msg_len,
-					   &need_more_input);
 	if (msg == NULL)
 		return need_more_input ? 1 : -1;
 
-	buf_len = wpabuf_len(in_data);
+	*in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->conn, msg);
-	if (data->tls_in_total > buf_len)
-		buf_len = data->tls_in_total;
-	/*
-	 * Even though we try to disable TLS compression, it is possible that
-	 * this cannot be done with all TLS libraries. Add extra buffer space
-	 * to handle the possibility of the decrypted data being longer than
-	 * input data.
-	 */
-	buf_len += 500;
-	buf_len *= 3;
-	*in_decrypted = wpabuf_alloc(buf_len ? buf_len : 1);
-	if (*in_decrypted == NULL) {
-		eap_peer_tls_reset_input(data);
-		wpa_printf(MSG_WARNING, "SSL: Failed to allocate memory for "
-			   "decryption");
-		return -1;
-	}
-
-	res = tls_connection_decrypt(sm->ssl_ctx, data->conn, msg, msg_len,
-				     wpabuf_mhead(*in_decrypted), buf_len);
 	eap_peer_tls_reset_input(data);
-	if (res < 0) {
+	if (*in_decrypted == NULL) {
 		wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
 		return -1;
 	}
-	wpabuf_put(*in_decrypted, res);
 	return 0;
 }
 
@@ -899,29 +863,17 @@ int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
 			 const struct wpabuf *in_data,
 			 struct wpabuf **out_data)
 {
-	int res;
-	size_t len;
-
 	if (in_data) {
 		eap_peer_tls_reset_output(data);
-		len = wpabuf_len(in_data) + 300;
+		data->tls_out = tls_connection_encrypt(sm->ssl_ctx, data->conn,
-		data->tls_out = os_malloc(len);
+						       in_data);
-		if (data->tls_out == NULL)
+		if (data->tls_out == NULL) {
-			return -1;
-
-		res = tls_connection_encrypt(sm->ssl_ctx, data->conn,
-					     wpabuf_head(in_data),
-					     wpabuf_len(in_data),
-					     data->tls_out, len);
-		if (res < 0) {
 			wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
 				   "data (in_len=%lu)",
 				   (unsigned long) wpabuf_len(in_data));
 			eap_peer_tls_reset_output(data);
 			return -1;
 		}
-
-		data->tls_out_len = res;
 	}
 
 	return eap_tls_process_output(data, eap_type, peap_version, id, 0,

src/eap_peer/eap_tls_common.h

@@ -1,6 +1,6 @@
 /*
  * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
- * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -27,12 +27,7 @@ struct eap_ssl_data {
 	/**
 	 * tls_out - TLS message to be sent out in fragments
 	 */
-	u8 *tls_out;
+	struct wpabuf *tls_out;
-
-	/**
-	 * tls_out_len - Total length of the outgoing TLS message
-	 */
-	size_t tls_out_len;
 
 	/**
 	 * tls_out_pos - The current position in the outgoing TLS message
@@ -47,12 +42,7 @@ struct eap_ssl_data {
 	/**
 	 * tls_in - Received TLS message buffer for re-assembly
 	 */
-	u8 *tls_in;
+	struct wpabuf *tls_in;
-
-	/**
-	 * tls_in_len - Number of bytes of the received TLS message in tls_in
-	 */
-	size_t tls_in_len;
 
 	/**
 	 * tls_in_left - Number of remaining bytes in the incoming TLS message
@@ -102,9 +92,6 @@ int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
 void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data);
 u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
 			     const char *label, size_t len);
-const u8 * eap_peer_tls_data_reassemble(
-	struct eap_ssl_data *data, const u8 *in_data, size_t in_len,
-	size_t *out_len, int *need_more_input);
 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 				EapType eap_type, int peap_version,
 				u8 id, const u8 *in_data, size_t in_len,

src/eap_server/eap_fast.c

@@ -816,8 +816,7 @@ static int eap_fast_encrypt_phase2(struct eap_sm *sm,
 
 	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 			    plain);
-	encr = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_mhead(plain),
+	encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
-				      wpabuf_len(plain));
 	wpabuf_free(plain);
 
 	if (data->ssl.out_buf && piggyback) {
@@ -1121,7 +1120,7 @@ static void eap_fast_process_phase2_eap(struct eap_sm *sm,
 }
 
 
-static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
+static int eap_fast_parse_tlvs(struct wpabuf *data,
 			       struct eap_fast_tlv_parse *tlv)
 {
 	int mandatory, tlv_type, len, res;
@@ -1129,8 +1128,8 @@ static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
 
 	os_memset(tlv, 0, sizeof(*tlv));
 
-	pos = data;
+	pos = wpabuf_mhead(data);
-	end = data + data_len;
+	end = pos + wpabuf_len(data);
 	while (pos + 4 < end) {
 		mandatory = pos[0] & 0x80;
 		tlv_type = WPA_GET_BE16(pos) & 0x3fff;
@@ -1241,12 +1240,12 @@ static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
 
 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
 					 struct eap_fast_data *data,
-					 u8 *in_data, size_t in_len)
+					 struct wpabuf *in_data)
 {
 	struct eap_fast_tlv_parse tlv;
 	int check_crypto_binding = data->state == CRYPTO_BINDING;
 
-	if (eap_fast_parse_tlvs(in_data, in_len, &tlv) < 0) {
+	if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
 		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
 			   "Phase 2 TLVs");
 		return;
@@ -1373,70 +1372,44 @@ static void eap_fast_process_phase2(struct eap_sm *sm,
 				    struct eap_fast_data *data,
 				    struct wpabuf *in_buf)
 {
-	u8 *in_decrypted;
+	struct wpabuf *in_decrypted;
-	int len_decrypted;
-	size_t buf_len;
-	u8 *in_data;
-	size_t in_len;
-
-	in_data = wpabuf_mhead(in_buf);
-	in_len = wpabuf_len(in_buf);
 
 	wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
-		   " Phase 2", (unsigned long) in_len);
+		   " Phase 2", (unsigned long) wpabuf_len(in_buf));
 
 	if (data->pending_phase2_resp) {
 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
 			   "skip decryption and use old data");
-		eap_fast_process_phase2_tlvs(
+		eap_fast_process_phase2_tlvs(sm, data,
-			sm, data, wpabuf_mhead(data->pending_phase2_resp),
+					     data->pending_phase2_resp);
-			wpabuf_len(data->pending_phase2_resp));
 		wpabuf_free(data->pending_phase2_resp);
 		data->pending_phase2_resp = NULL;
 		return;
 	}
 
-	buf_len = in_len;
+	in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-	/*
+					      in_buf);
-	 * Even though we try to disable TLS compression, it is possible that
-	 * this cannot be done with all TLS libraries. Add extra buffer space
-	 * to handle the possibility of the decrypted data being longer than
-	 * input data.
-	 */
-	buf_len += 500;
-	buf_len *= 3;
-	in_decrypted = os_malloc(buf_len);
 	if (in_decrypted == NULL) {
-		wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
-			   "for decryption");
-		return;
-	}
-
-	len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-					       in_data, in_len,
-					       in_decrypted, buf_len);
-	if (len_decrypted < 0) {
 		wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
 			   "data");
-		os_free(in_decrypted);
 		eap_fast_state(data, FAILURE);
 		return;
 	}
 
-	wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
+	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
-			in_decrypted, len_decrypted);
+			    in_decrypted);
 
-	eap_fast_process_phase2_tlvs(sm, data, in_decrypted, len_decrypted);
+	eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
 
 	if (sm->method_pending == METHOD_PENDING_WAIT) {
 		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
 			   "pending wait state - save decrypted response");
 		wpabuf_free(data->pending_phase2_resp);
-		data->pending_phase2_resp = wpabuf_alloc_copy(in_decrypted,
+		data->pending_phase2_resp = in_decrypted;
-							      len_decrypted);
+		return;
 	}
 
-	os_free(in_decrypted);
+	wpabuf_free(in_decrypted);
 }
 
 

src/eap_server/eap_peap.c

@@ -235,7 +235,7 @@ static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
 						 struct eap_peap_data *data,
 						 u8 id)
 {
-	struct wpabuf *buf, *encr_req;
+	struct wpabuf *buf, *encr_req, msgbuf;
 	const u8 *req;
 	size_t req_len;
 
@@ -260,7 +260,8 @@ static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
 		req_len -= sizeof(struct eap_hdr);
 	}
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
+	wpabuf_set(&msgbuf, req, req_len);
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 	wpabuf_free(buf);
 
 	return encr_req;
@@ -272,7 +273,7 @@ static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
 						 struct eap_peap_data *data,
 						 u8 id)
 {
-	struct wpabuf *buf1, *buf, *encr_req;
+	struct wpabuf *buf1, *buf, *encr_req, msgbuf;
 	const u8 *req;
 	size_t req_len;
 
@@ -297,8 +298,9 @@ static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
 
 	req += sizeof(struct eap_hdr);
 	req_len -= sizeof(struct eap_hdr);
+	wpabuf_set(&msgbuf, req, req_len);
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 	wpabuf_free(buf);
 
 	return encr_req;
@@ -450,8 +452,7 @@ static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
 	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
 			    buf);
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_head(buf),
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
-					  wpabuf_len(buf));
 	wpabuf_free(buf);
 
 	return encr_req;
@@ -462,7 +463,7 @@ static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
 						  struct eap_peap_data *data,
 						  u8 id, int success)
 {
-	struct wpabuf *encr_req;
+	struct wpabuf *encr_req, msgbuf;
 	size_t req_len;
 	struct eap_hdr *hdr;
 
@@ -478,7 +479,8 @@ static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
 			(u8 *) hdr, req_len);
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, (u8 *) hdr, req_len);
+	wpabuf_set(&msgbuf, hdr, req_len);
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 	os_free(hdr);
 
 	return encr_req;
@@ -1029,17 +1031,11 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
 				    struct wpabuf *in_buf)
 {
 	struct wpabuf *in_decrypted;
-	int len_decrypted;
 	const struct eap_hdr *hdr;
-	size_t buf_len, len;
+	size_t len;
-	u8 *in_data;
-	size_t in_len;
-
-	in_data = wpabuf_mhead(in_buf);
-	in_len = wpabuf_len(in_buf);
 
 	wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
-		   " Phase 2", (unsigned long) in_len);
+		   " Phase 2", (unsigned long) wpabuf_len(in_buf));
 
 	if (data->pending_phase2_resp) {
 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
@@ -1051,34 +1047,14 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
 		return;
 	}
 
-	buf_len = in_len;
+	in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-	/*
+					      in_buf);
-	 * Even though we try to disable TLS compression, it is possible that
-	 * this cannot be done with all TLS libraries. Add extra buffer space
-	 * to handle the possibility of the decrypted data being longer than
-	 * input data.
-	 */
-	buf_len += 500;
-	buf_len *= 3;
-	in_decrypted = wpabuf_alloc(buf_len);
 	if (in_decrypted == NULL) {
-		wpa_printf(MSG_WARNING, "EAP-PEAP: failed to allocate memory "
-			   "for decryption");
-		return;
-	}
-
-	len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-					       in_data, in_len,
-					       wpabuf_mhead(in_decrypted),
-					       buf_len);
-	if (len_decrypted < 0) {
 		wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
 			   "data");
-		wpabuf_free(in_decrypted);
 		eap_peap_state(data, FAILURE);
 		return;
 	}
-	wpabuf_put(in_decrypted, len_decrypted);
 
 	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 			    in_decrypted);
@@ -1191,7 +1167,7 @@ static void eap_peap_process_phase2(struct eap_sm *sm,
 		break;
 	}
 
-	os_free(in_decrypted);
+	wpabuf_free(in_decrypted);
 }
 
 
@@ -1199,7 +1175,6 @@ static int eap_peapv2_start_phase2(struct eap_sm *sm,
 				   struct eap_peap_data *data)
 {
 	struct wpabuf *buf, *buf2;
-	int res;
 
 	wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Phase1 done, include first Phase2 "
 		   "payload in the same message");
@@ -1218,26 +1193,16 @@ static int eap_peapv2_start_phase2(struct eap_sm *sm,
 
 	wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Identity Request", buf2);
 
-	buf = wpabuf_alloc(data->ssl.tls_out_limit);
+	buf = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
-	if (buf == NULL) {
+				     buf2);
-		wpabuf_free(buf2);
-		return -1;
-	}
-
-	res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
-				     wpabuf_head(buf2), wpabuf_len(buf2),
-				     wpabuf_put(buf, 0),
-				     data->ssl.tls_out_limit);
 	wpabuf_free(buf2);
 
-	if (res < 0) {
+	if (buf == NULL) {
 		wpa_printf(MSG_INFO, "EAP-PEAPv2: Failed to encrypt Phase 2 "
 			   "data");
-		wpabuf_free(buf);
 		return -1;
 	}
 
-	wpabuf_put(buf, res);
 	wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Encrypted Identity Request",
 			buf);
 

src/eap_server/eap_tls_common.c

@@ -1,6 +1,6 @@
 /*
- * hostapd / EAP-TLS/PEAP/TTLS/FAST common functions
+ * EAP-TLS/PEAP/TTLS/FAST server common functions
- * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -239,30 +239,22 @@ static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
 
 int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data)
 {
-	u8 *next;
-	size_t next_len;
-
-	next = tls_connection_server_handshake(
-		sm->ssl_ctx, data->conn,
-		wpabuf_mhead(data->in_buf),
-		wpabuf_len(data->in_buf),
-		&next_len);
-	if (next == NULL) {
-		wpa_printf(MSG_INFO, "SSL: TLS processing failed");
-		return -1;
-	}
 	if (data->out_buf) {
 		/* This should not happen.. */
 		wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
 			   "processing new message");
-		os_free(data->out_buf);
+		wpabuf_free(data->out_buf);
 		WPA_ASSERT(data->out_buf == NULL);
 	}
-	data->out_buf = wpabuf_alloc_ext_data(next, next_len);
+
+	data->out_buf = tls_connection_server_handshake(sm->ssl_ctx,
+							data->conn,
+							data->in_buf, NULL);
 	if (data->out_buf == NULL) {
-		os_free(next);
+		wpa_printf(MSG_INFO, "SSL: TLS processing failed");
 		return -1;
 	}
+
 	return 0;
 }
 
@@ -337,28 +329,17 @@ static void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
 
 struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
 				       struct eap_ssl_data *data,
-				       const u8 *plain, size_t plain_len)
+				       const struct wpabuf *plain)
 {
-	int res;
 	struct wpabuf *buf;
-	size_t buf_len;
 
-	/* reserve some extra room for encryption overhead */
+	buf = tls_connection_encrypt(sm->ssl_ctx, data->conn,
-	buf_len = plain_len + 300;
+				     plain);
-	buf = wpabuf_alloc(buf_len);
+	if (buf == NULL) {
-	if (buf == NULL)
-		return NULL;
-	res = tls_connection_encrypt(sm->ssl_ctx, data->conn,
-				     plain, plain_len, wpabuf_put(buf, 0),
-				     buf_len);
-	if (res < 0) {
 		wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
-		wpabuf_free(buf);
 		return NULL;
 	}
 
-	wpabuf_put(buf, res);
-
 	return buf;
 }
 

src/eap_server/eap_tls_common.h

@@ -1,6 +1,6 @@
 /*
- * hostapd / EAP-TLS/PEAP/TTLS/FAST common functions
+ * EAP-TLS/PEAP/TTLS/FAST server common functions
- * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -53,7 +53,7 @@ struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int version);
 int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data);
 struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
 				       struct eap_ssl_data *data,
-				       const u8 *plain, size_t plain_len);
+				       const struct wpabuf *plain);
 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,

src/eap_server/eap_ttls.c

@@ -163,14 +163,14 @@ struct eap_ttls_avp {
 };
 
 
-static int eap_ttls_avp_parse(u8 *buf, size_t len, struct eap_ttls_avp *parse)
+static int eap_ttls_avp_parse(struct wpabuf *buf, struct eap_ttls_avp *parse)
 {
 	struct ttls_avp *avp;
 	u8 *pos;
 	int left;
 
-	pos = buf;
+	pos = wpabuf_mhead(buf);
-	left = len;
+	left = wpabuf_len(buf);
 	os_memset(parse, 0, sizeof(*parse));
 
 	while (left > 0) {
@@ -449,8 +449,6 @@ static struct wpabuf * eap_ttls_build_phase2_eap_req(
 	struct eap_sm *sm, struct eap_ttls_data *data, u8 id)
 {
 	struct wpabuf *buf, *encr_req;
-	u8 *req;
-	size_t req_len;
 
 
 	buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
@@ -467,12 +465,10 @@ static struct wpabuf * eap_ttls_build_phase2_eap_req(
 		return NULL;
 	}
 
-	req = wpabuf_mhead(buf);
+	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated "
-	req_len = wpabuf_len(buf);
+			    "Phase 2 data", buf);
-	wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated Phase "
-			"2 data", req, req_len);
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
 	wpabuf_free(buf);
 
 	return encr_req;
@@ -482,10 +478,9 @@ static struct wpabuf * eap_ttls_build_phase2_eap_req(
 static struct wpabuf * eap_ttls_build_phase2_mschapv2(
 	struct eap_sm *sm, struct eap_ttls_data *data)
 {
-	struct wpabuf *encr_req;
+	struct wpabuf *encr_req, msgbuf;
 	u8 *req, *pos, *end;
 	int ret;
-	size_t req_len;
 
 	pos = req = os_malloc(100);
 	if (req == NULL)
@@ -510,11 +505,11 @@ static struct wpabuf * eap_ttls_build_phase2_mschapv2(
 		AVP_PAD(req, pos);
 	}
 
-	req_len = pos - req;
+	wpabuf_set(&msgbuf, req, pos - req);
-	wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
+	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
-			"data", req, req_len);
+			    "data", &msgbuf);
 
-	encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
+	encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 	os_free(req);
 
 	return encr_req;
@@ -1126,18 +1121,11 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
 				    struct eap_ttls_data *data,
 				    struct wpabuf *in_buf)
 {
-	u8 *in_decrypted;
+	struct wpabuf *in_decrypted;
-	int len_decrypted;
 	struct eap_ttls_avp parse;
-	size_t buf_len;
-	u8 *in_data;
-	size_t in_len;
-
-	in_data = wpabuf_mhead(in_buf);
-	in_len = wpabuf_len(in_buf);
 
 	wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
-		   " Phase 2", (unsigned long) in_len);
+		   " Phase 2", (unsigned long) wpabuf_len(in_buf));
 
 	if (data->pending_phase2_eap_resp) {
 		wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 EAP response "
@@ -1150,35 +1138,17 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
 		return;
 	}
 
-	buf_len = in_len;
+	in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-	/*
+					      in_buf);
-	 * Even though we try to disable TLS compression, it is possible that
-	 * this cannot be done with all TLS libraries. Add extra buffer space
-	 * to handle the possibility of the decrypted data being longer than
-	 * input data.
-	 */
-	buf_len += 500;
-	buf_len *= 3;
-	in_decrypted = os_malloc(buf_len);
 	if (in_decrypted == NULL) {
-		wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
-			   "for decryption");
-		return;
-	}
-
-	len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
-					       in_data, in_len,
-					       in_decrypted, buf_len);
-	if (len_decrypted < 0) {
 		wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
 			   "data");
-		os_free(in_decrypted);
 		eap_ttls_state(data, FAILURE);
 		return;
 	}
 
 	if (data->state == PHASE_FINISHED) {
-		if (len_decrypted == 0 &&
+		if (wpabuf_len(in_decrypted) == 0 &&
 		    tls_connection_ia_final_phase_finished(sm->ssl_ctx,
 							   data->ssl.conn)) {
 			wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished "
@@ -1190,16 +1160,16 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
 			eap_ttls_state(data, FAILURE);
 		}
 
-		os_free(in_decrypted);
+		wpabuf_free(in_decrypted);
 		return;
 	}
 
-	wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 EAP",
+	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 EAP",
-			in_decrypted, len_decrypted);
+			    in_decrypted);
 
-	if (eap_ttls_avp_parse(in_decrypted, len_decrypted, &parse) < 0) {
+	if (eap_ttls_avp_parse(in_decrypted, &parse) < 0) {
 		wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to parse AVPs");
-		os_free(in_decrypted);
+		wpabuf_free(in_decrypted);
 		eap_ttls_state(data, FAILURE);
 		return;
 	}
@@ -1257,7 +1227,7 @@ static void eap_ttls_process_phase2(struct eap_sm *sm,
 	}
 
 done:
-	os_free(in_decrypted);
+	wpabuf_free(in_decrypted);
 	os_free(parse.eap);
 }