![Jouni Malinen](/assets/img/avatar_default.png)
Remove the GPL notification text from the files that were initially contributed by myself. Signed-hostap: Jouni Malinen <j@w1.fi>
626 lines
16 KiB
C
626 lines
16 KiB
C
/*
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* TLS v1.0/v1.1/v1.2 server (RFC 2246, RFC 4346, RFC 5246)
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "crypto/sha1.h"
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#include "crypto/tls.h"
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#include "tlsv1_common.h"
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#include "tlsv1_record.h"
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#include "tlsv1_server.h"
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#include "tlsv1_server_i.h"
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/* TODO:
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* Support for a message fragmented across several records (RFC 2246, 6.2.1)
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*/
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void tlsv1_server_alert(struct tlsv1_server *conn, u8 level, u8 description)
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{
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conn->alert_level = level;
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conn->alert_description = description;
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}
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int tlsv1_server_derive_keys(struct tlsv1_server *conn,
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const u8 *pre_master_secret,
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size_t pre_master_secret_len)
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{
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u8 seed[2 * TLS_RANDOM_LEN];
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u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
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u8 *pos;
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size_t key_block_len;
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if (pre_master_secret) {
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
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pre_master_secret, pre_master_secret_len);
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os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
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os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
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TLS_RANDOM_LEN);
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if (tls_prf(conn->rl.tls_version,
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pre_master_secret, pre_master_secret_len,
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"master secret", seed, 2 * TLS_RANDOM_LEN,
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conn->master_secret, TLS_MASTER_SECRET_LEN)) {
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wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
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"master_secret");
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return -1;
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}
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
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conn->master_secret, TLS_MASTER_SECRET_LEN);
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}
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os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
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os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
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key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len +
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conn->rl.iv_size);
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if (tls_prf(conn->rl.tls_version,
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conn->master_secret, TLS_MASTER_SECRET_LEN,
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"key expansion", seed, 2 * TLS_RANDOM_LEN,
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key_block, key_block_len)) {
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wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
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return -1;
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}
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
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key_block, key_block_len);
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pos = key_block;
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/* client_write_MAC_secret */
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os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
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pos += conn->rl.hash_size;
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/* server_write_MAC_secret */
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os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
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pos += conn->rl.hash_size;
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/* client_write_key */
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os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
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pos += conn->rl.key_material_len;
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/* server_write_key */
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os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
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pos += conn->rl.key_material_len;
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/* client_write_IV */
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os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
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pos += conn->rl.iv_size;
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/* server_write_IV */
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os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
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pos += conn->rl.iv_size;
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return 0;
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}
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/**
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* tlsv1_server_handshake - Process TLS handshake
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* @in_data: Input data from TLS peer
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* @in_len: Input data length
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* @out_len: Length of the output buffer.
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* Returns: Pointer to output data, %NULL on failure
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*/
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u8 * tlsv1_server_handshake(struct tlsv1_server *conn,
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const u8 *in_data, size_t in_len,
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size_t *out_len)
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{
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const u8 *pos, *end;
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u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct;
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size_t in_msg_len;
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int used;
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if (in_data == NULL || in_len == 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: No input data to server");
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return NULL;
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}
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pos = in_data;
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end = in_data + in_len;
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in_msg = os_malloc(in_len);
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if (in_msg == NULL)
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return NULL;
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/* Each received packet may include multiple records */
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while (pos < end) {
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in_msg_len = in_len;
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used = tlsv1_record_receive(&conn->rl, pos, end - pos,
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in_msg, &in_msg_len, &alert);
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if (used < 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
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"record failed");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
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goto failed;
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}
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if (used == 0) {
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/* need more data */
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wpa_printf(MSG_DEBUG, "TLSv1: Partial processing not "
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"yet supported");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
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goto failed;
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}
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ct = pos[0];
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in_pos = in_msg;
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in_end = in_msg + in_msg_len;
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/* Each received record may include multiple messages of the
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* same ContentType. */
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while (in_pos < in_end) {
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in_msg_len = in_end - in_pos;
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if (tlsv1_server_process_handshake(conn, ct, in_pos,
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&in_msg_len) < 0)
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goto failed;
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in_pos += in_msg_len;
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}
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pos += used;
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}
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os_free(in_msg);
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in_msg = NULL;
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msg = tlsv1_server_handshake_write(conn, out_len);
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failed:
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os_free(in_msg);
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if (conn->alert_level) {
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if (conn->state == FAILED) {
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/* Avoid alert loops */
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wpa_printf(MSG_DEBUG, "TLSv1: Drop alert loop");
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os_free(msg);
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return NULL;
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}
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conn->state = FAILED;
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os_free(msg);
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msg = tlsv1_server_send_alert(conn, conn->alert_level,
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conn->alert_description,
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out_len);
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}
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return msg;
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}
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/**
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* tlsv1_server_encrypt - Encrypt data into TLS tunnel
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* @in_data: Pointer to plaintext data to be encrypted
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* @in_len: Input buffer length
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* @out_data: Pointer to output buffer (encrypted TLS data)
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* @out_len: Maximum out_data length
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* Returns: Number of bytes written to out_data, -1 on failure
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*
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* This function is used after TLS handshake has been completed successfully to
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* send data in the encrypted tunnel.
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*/
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int tlsv1_server_encrypt(struct tlsv1_server *conn,
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const u8 *in_data, size_t in_len,
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u8 *out_data, size_t out_len)
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{
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size_t rlen;
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
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in_data, in_len);
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if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
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out_data, out_len, in_data, in_len, &rlen) < 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_INTERNAL_ERROR);
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return -1;
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}
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return rlen;
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}
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/**
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* tlsv1_server_decrypt - Decrypt data from TLS tunnel
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* @in_data: Pointer to input buffer (encrypted TLS data)
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* @in_len: Input buffer length
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* @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
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* @out_len: Maximum out_data length
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* Returns: Number of bytes written to out_data, -1 on failure
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*
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* This function is used after TLS handshake has been completed successfully to
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* receive data from the encrypted tunnel.
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*/
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int tlsv1_server_decrypt(struct tlsv1_server *conn,
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const u8 *in_data, size_t in_len,
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u8 *out_data, size_t out_len)
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{
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const u8 *in_end, *pos;
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int used;
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u8 alert, *out_end, *out_pos, ct;
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size_t olen;
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pos = in_data;
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in_end = in_data + in_len;
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out_pos = out_data;
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out_end = out_data + out_len;
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while (pos < in_end) {
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ct = pos[0];
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olen = out_end - out_pos;
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used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
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out_pos, &olen, &alert);
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if (used < 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
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"failed");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
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return -1;
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}
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if (used == 0) {
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/* need more data */
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wpa_printf(MSG_DEBUG, "TLSv1: Partial processing not "
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"yet supported");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
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return -1;
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}
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if (ct == TLS_CONTENT_TYPE_ALERT) {
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if (olen < 2) {
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wpa_printf(MSG_DEBUG, "TLSv1: Alert "
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"underflow");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_DECODE_ERROR);
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return -1;
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}
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wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
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out_pos[0], out_pos[1]);
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if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
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/* Continue processing */
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pos += used;
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continue;
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}
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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out_pos[1]);
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return -1;
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}
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if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
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wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
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"0x%x", pos[0]);
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_UNEXPECTED_MESSAGE);
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return -1;
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}
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out_pos += olen;
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if (out_pos > out_end) {
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wpa_printf(MSG_DEBUG, "TLSv1: Buffer not large enough "
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"for processing the received record");
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_INTERNAL_ERROR);
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return -1;
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}
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pos += used;
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}
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return out_pos - out_data;
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}
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/**
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* tlsv1_server_global_init - Initialize TLSv1 server
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* Returns: 0 on success, -1 on failure
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*
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* This function must be called before using any other TLSv1 server functions.
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*/
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int tlsv1_server_global_init(void)
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{
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return crypto_global_init();
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}
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/**
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* tlsv1_server_global_deinit - Deinitialize TLSv1 server
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*
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* This function can be used to deinitialize the TLSv1 server that was
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* initialized by calling tlsv1_server_global_init(). No TLSv1 server functions
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* can be called after this before calling tlsv1_server_global_init() again.
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*/
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void tlsv1_server_global_deinit(void)
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{
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crypto_global_deinit();
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}
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/**
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* tlsv1_server_init - Initialize TLSv1 server connection
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* @cred: Pointer to server credentials from tlsv1_server_cred_alloc()
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* Returns: Pointer to TLSv1 server connection data or %NULL on failure
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*/
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struct tlsv1_server * tlsv1_server_init(struct tlsv1_credentials *cred)
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{
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struct tlsv1_server *conn;
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size_t count;
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u16 *suites;
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conn = os_zalloc(sizeof(*conn));
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if (conn == NULL)
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return NULL;
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conn->cred = cred;
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conn->state = CLIENT_HELLO;
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if (tls_verify_hash_init(&conn->verify) < 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
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"hash");
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os_free(conn);
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return NULL;
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}
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count = 0;
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suites = conn->cipher_suites;
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#ifndef CONFIG_CRYPTO_INTERNAL
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suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
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#endif /* CONFIG_CRYPTO_INTERNAL */
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suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
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suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
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suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
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suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
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conn->num_cipher_suites = count;
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return conn;
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}
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static void tlsv1_server_clear_data(struct tlsv1_server *conn)
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{
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tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
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tlsv1_record_change_write_cipher(&conn->rl);
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tlsv1_record_change_read_cipher(&conn->rl);
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tls_verify_hash_free(&conn->verify);
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crypto_public_key_free(conn->client_rsa_key);
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conn->client_rsa_key = NULL;
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os_free(conn->session_ticket);
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conn->session_ticket = NULL;
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conn->session_ticket_len = 0;
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conn->use_session_ticket = 0;
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os_free(conn->dh_secret);
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conn->dh_secret = NULL;
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conn->dh_secret_len = 0;
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}
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/**
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* tlsv1_server_deinit - Deinitialize TLSv1 server connection
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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*/
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void tlsv1_server_deinit(struct tlsv1_server *conn)
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{
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tlsv1_server_clear_data(conn);
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os_free(conn);
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}
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/**
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* tlsv1_server_established - Check whether connection has been established
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* Returns: 1 if connection is established, 0 if not
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*/
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int tlsv1_server_established(struct tlsv1_server *conn)
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{
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return conn->state == ESTABLISHED;
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}
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/**
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* tlsv1_server_prf - Use TLS-PRF to derive keying material
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* @label: Label (e.g., description of the key) for PRF
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* @server_random_first: seed is 0 = client_random|server_random,
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* 1 = server_random|client_random
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* @out: Buffer for output data from TLS-PRF
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* @out_len: Length of the output buffer
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* Returns: 0 on success, -1 on failure
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*/
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int tlsv1_server_prf(struct tlsv1_server *conn, const char *label,
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int server_random_first, u8 *out, size_t out_len)
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{
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u8 seed[2 * TLS_RANDOM_LEN];
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if (conn->state != ESTABLISHED)
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return -1;
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if (server_random_first) {
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os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
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os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
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TLS_RANDOM_LEN);
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} else {
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os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
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os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
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TLS_RANDOM_LEN);
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}
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return tls_prf(conn->rl.tls_version,
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conn->master_secret, TLS_MASTER_SECRET_LEN,
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label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
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}
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/**
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* tlsv1_server_get_cipher - Get current cipher name
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* @conn: TLSv1 server connection data from tlsv1_server_init()
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* @buf: Buffer for the cipher name
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* @buflen: buf size
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* Returns: 0 on success, -1 on failure
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*
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* Get the name of the currently used cipher.
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*/
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int tlsv1_server_get_cipher(struct tlsv1_server *conn, char *buf,
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size_t buflen)
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{
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char *cipher;
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switch (conn->rl.cipher_suite) {
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case TLS_RSA_WITH_RC4_128_MD5:
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cipher = "RC4-MD5";
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break;
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case TLS_RSA_WITH_RC4_128_SHA:
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cipher = "RC4-SHA";
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break;
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case TLS_RSA_WITH_DES_CBC_SHA:
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cipher = "DES-CBC-SHA";
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break;
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case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
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cipher = "DES-CBC3-SHA";
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break;
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case TLS_DH_anon_WITH_AES_128_CBC_SHA:
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cipher = "ADH-AES-128-SHA";
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break;
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case TLS_RSA_WITH_AES_256_CBC_SHA:
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cipher = "AES-256-SHA";
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break;
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case TLS_RSA_WITH_AES_128_CBC_SHA:
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cipher = "AES-128-SHA";
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
if (os_strlcpy(buf, cipher, buflen) >= buflen)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* tlsv1_server_shutdown - Shutdown TLS connection
|
|
* @conn: TLSv1 server connection data from tlsv1_server_init()
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int tlsv1_server_shutdown(struct tlsv1_server *conn)
|
|
{
|
|
conn->state = CLIENT_HELLO;
|
|
|
|
if (tls_verify_hash_init(&conn->verify) < 0) {
|
|
wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
|
|
"hash");
|
|
return -1;
|
|
}
|
|
|
|
tlsv1_server_clear_data(conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* tlsv1_server_resumed - Was session resumption used
|
|
* @conn: TLSv1 server connection data from tlsv1_server_init()
|
|
* Returns: 1 if current session used session resumption, 0 if not
|
|
*/
|
|
int tlsv1_server_resumed(struct tlsv1_server *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* tlsv1_server_get_keys - Get master key and random data from TLS connection
|
|
* @conn: TLSv1 server connection data from tlsv1_server_init()
|
|
* @keys: Structure of key/random data (filled on success)
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int tlsv1_server_get_keys(struct tlsv1_server *conn, struct tls_keys *keys)
|
|
{
|
|
os_memset(keys, 0, sizeof(*keys));
|
|
if (conn->state == CLIENT_HELLO)
|
|
return -1;
|
|
|
|
keys->client_random = conn->client_random;
|
|
keys->client_random_len = TLS_RANDOM_LEN;
|
|
|
|
if (conn->state != SERVER_HELLO) {
|
|
keys->server_random = conn->server_random;
|
|
keys->server_random_len = TLS_RANDOM_LEN;
|
|
keys->master_key = conn->master_secret;
|
|
keys->master_key_len = TLS_MASTER_SECRET_LEN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* tlsv1_server_get_keyblock_size - Get TLS key_block size
|
|
* @conn: TLSv1 server connection data from tlsv1_server_init()
|
|
* Returns: Size of the key_block for the negotiated cipher suite or -1 on
|
|
* failure
|
|
*/
|
|
int tlsv1_server_get_keyblock_size(struct tlsv1_server *conn)
|
|
{
|
|
if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
|
|
return -1;
|
|
|
|
return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
|
|
conn->rl.iv_size);
|
|
}
|
|
|
|
|
|
/**
|
|
* tlsv1_server_set_cipher_list - Configure acceptable cipher suites
|
|
* @conn: TLSv1 server connection data from tlsv1_server_init()
|
|
* @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
|
|
* (TLS_CIPHER_*).
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int tlsv1_server_set_cipher_list(struct tlsv1_server *conn, u8 *ciphers)
|
|
{
|
|
size_t count;
|
|
u16 *suites;
|
|
|
|
/* TODO: implement proper configuration of cipher suites */
|
|
if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
|
|
count = 0;
|
|
suites = conn->cipher_suites;
|
|
#ifndef CONFIG_CRYPTO_INTERNAL
|
|
suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
|
|
#endif /* CONFIG_CRYPTO_INTERNAL */
|
|
suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
|
|
suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
|
|
suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
|
|
suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
|
|
#ifndef CONFIG_CRYPTO_INTERNAL
|
|
suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
|
|
#endif /* CONFIG_CRYPTO_INTERNAL */
|
|
suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
|
|
suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
|
|
suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
|
|
suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
|
|
conn->num_cipher_suites = count;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tlsv1_server_set_verify(struct tlsv1_server *conn, int verify_peer)
|
|
{
|
|
conn->verify_peer = verify_peer;
|
|
return 0;
|
|
}
|
|
|
|
|
|
void tlsv1_server_set_session_ticket_cb(struct tlsv1_server *conn,
|
|
tlsv1_server_session_ticket_cb cb,
|
|
void *ctx)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
|
|
cb, ctx);
|
|
conn->session_ticket_cb = cb;
|
|
conn->session_ticket_cb_ctx = ctx;
|
|
}
|