--- /dev/null
+/*
+ * TLSv1 server - write handshake message
+ * Copyright (c) 2006-2007, 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
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "crypto/md5.h"
+#include "crypto/sha1.h"
+#include "crypto/tls.h"
+#include "x509v3.h"
+#include "tlsv1_common.h"
+#include "tlsv1_record.h"
+#include "tlsv1_server.h"
+#include "tlsv1_server_i.h"
+
+
+static size_t tls_server_cert_chain_der_len(struct tlsv1_server *conn)
+{
+ size_t len = 0;
+ struct x509_certificate *cert;
+
+ cert = conn->cred->cert;
+ while (cert) {
+ len += 3 + cert->cert_len;
+ if (x509_certificate_self_signed(cert))
+ break;
+ cert = x509_certificate_get_subject(conn->cred->trusted_certs,
+ &cert->issuer);
+ }
+
+ return len;
+}
+
+
+static int tls_write_server_hello(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr, *hs_start, *hs_length;
+ struct os_time now;
+ size_t rlen;
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send ServerHello");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+
+ os_get_time(&now);
+ WPA_PUT_BE32(conn->server_random, now.sec);
+ if (os_get_random(conn->server_random + 4, TLS_RANDOM_LEN - 4)) {
+ wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
+ "server_random");
+ return -1;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "TLSv1: server_random",
+ conn->server_random, TLS_RANDOM_LEN);
+
+ conn->session_id_len = TLS_SESSION_ID_MAX_LEN;
+ if (os_get_random(conn->session_id, conn->session_id_len)) {
+ wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
+ "session_id");
+ return -1;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "TLSv1: session_id",
+ conn->session_id, conn->session_id_len);
+
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+ /* body - ServerHello */
+ /* ProtocolVersion server_version */
+ WPA_PUT_BE16(pos, TLS_VERSION);
+ pos += 2;
+ /* Random random: uint32 gmt_unix_time, opaque random_bytes */
+ os_memcpy(pos, conn->server_random, TLS_RANDOM_LEN);
+ pos += TLS_RANDOM_LEN;
+ /* SessionID session_id */
+ *pos++ = conn->session_id_len;
+ os_memcpy(pos, conn->session_id, conn->session_id_len);
+ pos += conn->session_id_len;
+ /* CipherSuite cipher_suite */
+ WPA_PUT_BE16(pos, conn->cipher_suite);
+ pos += 2;
+ /* CompressionMethod compression_method */
+ *pos++ = TLS_COMPRESSION_NULL;
+
+ if (conn->session_ticket && conn->session_ticket_cb) {
+ int res = conn->session_ticket_cb(
+ conn->session_ticket_cb_ctx,
+ conn->session_ticket, conn->session_ticket_len,
+ conn->client_random, conn->server_random,
+ conn->master_secret);
+ if (res < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback "
+ "indicated failure");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_HANDSHAKE_FAILURE);
+ return -1;
+ }
+ conn->use_session_ticket = res;
+
+ if (conn->use_session_ticket) {
+ if (tlsv1_server_derive_keys(conn, NULL, 0) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
+ "derive keys");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ }
+
+ /*
+ * RFC 4507 specifies that server would include an empty
+ * SessionTicket extension in ServerHello and a
+ * NewSessionTicket message after the ServerHello. However,
+ * EAP-FAST (RFC 4851), i.e., the only user of SessionTicket
+ * extension at the moment, does not use such extensions.
+ *
+ * TODO: Add support for configuring RFC 4507 behavior and make
+ * EAP-FAST disable it.
+ */
+ }
+
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ pos = rhdr + rlen;
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static int tls_write_server_certificate(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
+ size_t rlen;
+ struct x509_certificate *cert;
+ const struct tls_cipher_suite *suite;
+
+ suite = tls_get_cipher_suite(conn->rl.cipher_suite);
+ if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Do not send Certificate when "
+ "using anonymous DH");
+ return 0;
+ }
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+ /* body - Certificate */
+ /* uint24 length (to be filled) */
+ cert_start = pos;
+ pos += 3;
+ cert = conn->cred->cert;
+ while (cert) {
+ if (pos + 3 + cert->cert_len > end) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space "
+ "for Certificate (cert_len=%lu left=%lu)",
+ (unsigned long) cert->cert_len,
+ (unsigned long) (end - pos));
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ WPA_PUT_BE24(pos, cert->cert_len);
+ pos += 3;
+ os_memcpy(pos, cert->cert_start, cert->cert_len);
+ pos += cert->cert_len;
+
+ if (x509_certificate_self_signed(cert))
+ break;
+ cert = x509_certificate_get_subject(conn->cred->trusted_certs,
+ &cert->issuer);
+ }
+ if (cert == conn->cred->cert || cert == NULL) {
+ /*
+ * Server was not configured with all the needed certificates
+ * to form a full certificate chain. The client may fail to
+ * validate the chain unless it is configured with all the
+ * missing CA certificates.
+ */
+ wpa_printf(MSG_DEBUG, "TLSv1: Full server certificate chain "
+ "not configured - validation may fail");
+ }
+ WPA_PUT_BE24(cert_start, pos - cert_start - 3);
+
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ pos = rhdr + rlen;
+
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static int tls_write_server_key_exchange(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ tls_key_exchange keyx;
+ const struct tls_cipher_suite *suite;
+ u8 *pos, *rhdr, *hs_start, *hs_length;
+ size_t rlen;
+ u8 *dh_ys;
+ size_t dh_ys_len;
+
+ suite = tls_get_cipher_suite(conn->rl.cipher_suite);
+ if (suite == NULL)
+ keyx = TLS_KEY_X_NULL;
+ else
+ keyx = suite->key_exchange;
+
+ if (!tls_server_key_exchange_allowed(conn->rl.cipher_suite)) {
+ wpa_printf(MSG_DEBUG, "TLSv1: No ServerKeyExchange needed");
+ return 0;
+ }
+
+ if (keyx != TLS_KEY_X_DH_anon) {
+ /* TODO? */
+ wpa_printf(MSG_DEBUG, "TLSv1: ServerKeyExchange not yet "
+ "supported with key exchange type %d", keyx);
+ return -1;
+ }
+
+ if (conn->cred == NULL || conn->cred->dh_p == NULL ||
+ conn->cred->dh_g == NULL) {
+ wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available for "
+ "ServerKeyExhcange");
+ return -1;
+ }
+
+ os_free(conn->dh_secret);
+ conn->dh_secret_len = conn->cred->dh_p_len;
+ conn->dh_secret = os_malloc(conn->dh_secret_len);
+ if (conn->dh_secret == NULL) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
+ "memory for secret (Diffie-Hellman)");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ if (os_get_random(conn->dh_secret, conn->dh_secret_len)) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
+ "data for Diffie-Hellman");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ os_free(conn->dh_secret);
+ conn->dh_secret = NULL;
+ return -1;
+ }
+
+ if (os_memcmp(conn->dh_secret, conn->cred->dh_p, conn->dh_secret_len) >
+ 0)
+ conn->dh_secret[0] = 0; /* make sure secret < p */
+
+ pos = conn->dh_secret;
+ while (pos + 1 < conn->dh_secret + conn->dh_secret_len && *pos == 0)
+ pos++;
+ if (pos != conn->dh_secret) {
+ os_memmove(conn->dh_secret, pos,
+ conn->dh_secret_len - (pos - conn->dh_secret));
+ conn->dh_secret_len -= pos - conn->dh_secret;
+ }
+ wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH server's secret value",
+ conn->dh_secret, conn->dh_secret_len);
+
+ /* Ys = g^secret mod p */
+ dh_ys_len = conn->cred->dh_p_len;
+ dh_ys = os_malloc(dh_ys_len);
+ if (dh_ys == NULL) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate memory for "
+ "Diffie-Hellman");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ if (crypto_mod_exp(conn->cred->dh_g, conn->cred->dh_g_len,
+ conn->dh_secret, conn->dh_secret_len,
+ conn->cred->dh_p, conn->cred->dh_p_len,
+ dh_ys, &dh_ys_len)) {
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ os_free(dh_ys);
+ return -1;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)",
+ dh_ys, dh_ys_len);
+
+ /*
+ * struct {
+ * select (KeyExchangeAlgorithm) {
+ * case diffie_hellman:
+ * ServerDHParams params;
+ * Signature signed_params;
+ * case rsa:
+ * ServerRSAParams params;
+ * Signature signed_params;
+ * };
+ * } ServerKeyExchange;
+ *
+ * struct {
+ * opaque dh_p<1..2^16-1>;
+ * opaque dh_g<1..2^16-1>;
+ * opaque dh_Ys<1..2^16-1>;
+ * } ServerDHParams;
+ */
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send ServerKeyExchange");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+
+ /* body - ServerDHParams */
+ /* dh_p */
+ if (pos + 2 + conn->cred->dh_p_len > end) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
+ "dh_p");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ os_free(dh_ys);
+ return -1;
+ }
+ WPA_PUT_BE16(pos, conn->cred->dh_p_len);
+ pos += 2;
+ os_memcpy(pos, conn->cred->dh_p, conn->cred->dh_p_len);
+ pos += conn->cred->dh_p_len;
+
+ /* dh_g */
+ if (pos + 2 + conn->cred->dh_g_len > end) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
+ "dh_g");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ os_free(dh_ys);
+ return -1;
+ }
+ WPA_PUT_BE16(pos, conn->cred->dh_g_len);
+ pos += 2;
+ os_memcpy(pos, conn->cred->dh_g, conn->cred->dh_g_len);
+ pos += conn->cred->dh_g_len;
+
+ /* dh_Ys */
+ if (pos + 2 + dh_ys_len > end) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
+ "dh_Ys");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ os_free(dh_ys);
+ return -1;
+ }
+ WPA_PUT_BE16(pos, dh_ys_len);
+ pos += 2;
+ os_memcpy(pos, dh_ys, dh_ys_len);
+ pos += dh_ys_len;
+ os_free(dh_ys);
+
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ pos = rhdr + rlen;
+
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static int tls_write_server_certificate_request(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr, *hs_start, *hs_length;
+ size_t rlen;
+
+ if (!conn->verify_peer) {
+ wpa_printf(MSG_DEBUG, "TLSv1: No CertificateRequest needed");
+ return 0;
+ }
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateRequest");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+ /* body - CertificateRequest */
+
+ /*
+ * enum {
+ * rsa_sign(1), dss_sign(2), rsa_fixed_dh(3), dss_fixed_dh(4),
+ * (255)
+ * } ClientCertificateType;
+ * ClientCertificateType certificate_types<1..2^8-1>
+ */
+ *pos++ = 1;
+ *pos++ = 1; /* rsa_sign */
+
+ /*
+ * opaque DistinguishedName<1..2^16-1>
+ * DistinguishedName certificate_authorities<3..2^16-1>
+ */
+ /* TODO: add support for listing DNs for trusted CAs */
+ WPA_PUT_BE16(pos, 0);
+ pos += 2;
+
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ pos = rhdr + rlen;
+
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static int tls_write_server_hello_done(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr, *hs_start, *hs_length;
+ size_t rlen;
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send ServerHelloDone");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+ /* body - ServerHelloDone (empty) */
+
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ pos = rhdr + rlen;
+
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static int tls_write_server_change_cipher_spec(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr;
+ size_t rlen;
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec");
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+ *pos = TLS_CHANGE_CIPHER_SPEC;
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
+ rhdr, end - rhdr, 1, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+
+ if (tlsv1_record_change_write_cipher(&conn->rl) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for "
+ "record layer");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+
+ *msgpos = rhdr + rlen;
+
+ return 0;
+}
+
+
+static int tls_write_server_finished(struct tlsv1_server *conn,
+ u8 **msgpos, u8 *end)
+{
+ u8 *pos, *rhdr, *hs_start, *hs_length;
+ size_t rlen, hlen;
+ u8 verify_data[TLS_VERIFY_DATA_LEN];
+ u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
+
+ pos = *msgpos;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send Finished");
+
+ /* Encrypted Handshake Message: Finished */
+
+ hlen = MD5_MAC_LEN;
+ if (conn->verify.md5_server == NULL ||
+ crypto_hash_finish(conn->verify.md5_server, hash, &hlen) < 0) {
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ conn->verify.md5_server = NULL;
+ crypto_hash_finish(conn->verify.sha1_server, NULL, NULL);
+ conn->verify.sha1_server = NULL;
+ return -1;
+ }
+ conn->verify.md5_server = NULL;
+ hlen = SHA1_MAC_LEN;
+ if (conn->verify.sha1_server == NULL ||
+ crypto_hash_finish(conn->verify.sha1_server, hash + MD5_MAC_LEN,
+ &hlen) < 0) {
+ conn->verify.sha1_server = NULL;
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ conn->verify.sha1_server = NULL;
+
+ if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
+ "server finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
+ verify_data, TLS_VERIFY_DATA_LEN)) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+ wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (server)",
+ verify_data, TLS_VERIFY_DATA_LEN);
+
+ rhdr = pos;
+ pos += TLS_RECORD_HEADER_LEN;
+ /* Handshake */
+ hs_start = pos;
+ /* HandshakeType msg_type */
+ *pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
+ /* uint24 length (to be filled) */
+ hs_length = pos;
+ pos += 3;
+ os_memcpy(pos, verify_data, TLS_VERIFY_DATA_LEN);
+ pos += TLS_VERIFY_DATA_LEN;
+ WPA_PUT_BE24(hs_length, pos - hs_length - 3);
+ tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
+
+ if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
+ rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
+ wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
+ tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
+ TLS_ALERT_INTERNAL_ERROR);
+ return -1;
+ }
+
+ pos = rhdr + rlen;
+
+ *msgpos = pos;
+
+ return 0;
+}
+
+
+static u8 * tls_send_server_hello(struct tlsv1_server *conn, size_t *out_len)
+{
+ u8 *msg, *end, *pos;
+ size_t msglen;
+
+ *out_len = 0;
+
+ msglen = 1000 + tls_server_cert_chain_der_len(conn);
+
+ msg = os_malloc(msglen);
+ if (msg == NULL)
+ return NULL;
+
+ pos = msg;
+ end = msg + msglen;
+
+ if (tls_write_server_hello(conn, &pos, end) < 0) {
+ os_free(msg);
+ return NULL;
+ }
+
+ if (conn->use_session_ticket) {
+ /* Abbreviated handshake using session ticket; RFC 4507 */
+ if (tls_write_server_change_cipher_spec(conn, &pos, end) < 0 ||
+ tls_write_server_finished(conn, &pos, end) < 0) {
+ os_free(msg);
+ return NULL;
+ }
+
+ *out_len = pos - msg;
+
+ conn->state = CHANGE_CIPHER_SPEC;
+
+ return msg;
+ }
+
+ /* Full handshake */
+ if (tls_write_server_certificate(conn, &pos, end) < 0 ||
+ tls_write_server_key_exchange(conn, &pos, end) < 0 ||
+ tls_write_server_certificate_request(conn, &pos, end) < 0 ||
+ tls_write_server_hello_done(conn, &pos, end) < 0) {
+ os_free(msg);
+ return NULL;
+ }
+
+ *out_len = pos - msg;
+
+ conn->state = CLIENT_CERTIFICATE;
+
+ return msg;
+}
+
+
+static u8 * tls_send_change_cipher_spec(struct tlsv1_server *conn,
+ size_t *out_len)
+{
+ u8 *msg, *end, *pos;
+
+ *out_len = 0;
+
+ msg = os_malloc(1000);
+ if (msg == NULL)
+ return NULL;
+
+ pos = msg;
+ end = msg + 1000;
+
+ if (tls_write_server_change_cipher_spec(conn, &pos, end) < 0 ||
+ tls_write_server_finished(conn, &pos, end) < 0) {
+ os_free(msg);
+ return NULL;
+ }
+
+ *out_len = pos - msg;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed successfully");
+ conn->state = ESTABLISHED;
+
+ return msg;
+}
+
+
+u8 * tlsv1_server_handshake_write(struct tlsv1_server *conn, size_t *out_len)
+{
+ switch (conn->state) {
+ case SERVER_HELLO:
+ return tls_send_server_hello(conn, out_len);
+ case SERVER_CHANGE_CIPHER_SPEC:
+ return tls_send_change_cipher_spec(conn, out_len);
+ default:
+ if (conn->state == ESTABLISHED && conn->use_session_ticket) {
+ /* Abbreviated handshake was already completed. */
+ return NULL;
+ }
+ wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while "
+ "generating reply", conn->state);
+ return NULL;
+ }
+}
+
+
+u8 * tlsv1_server_send_alert(struct tlsv1_server *conn, u8 level,
+ u8 description, size_t *out_len)
+{
+ u8 *alert, *pos, *length;
+
+ wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description);
+ *out_len = 0;
+
+ alert = os_malloc(10);
+ if (alert == NULL)
+ return NULL;
+
+ pos = alert;
+
+ /* TLSPlaintext */
+ /* ContentType type */
+ *pos++ = TLS_CONTENT_TYPE_ALERT;
+ /* ProtocolVersion version */
+ WPA_PUT_BE16(pos, TLS_VERSION);
+ pos += 2;
+ /* uint16 length (to be filled) */
+ length = pos;
+ pos += 2;
+ /* opaque fragment[TLSPlaintext.length] */
+
+ /* Alert */
+ /* AlertLevel level */
+ *pos++ = level;
+ /* AlertDescription description */
+ *pos++ = description;
+
+ WPA_PUT_BE16(length, pos - length - 2);
+ *out_len = pos - alert;
+
+ return alert;
+}
projects / mech_eap.git / blobdiff