tls_internal.c

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/*
 * TLS interface functions and an internal TLS implementation
 * 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
 * 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.
 *
 * This file interface functions for hostapd/wpa_supplicant to use the
 * integrated TLSv1 implementation.
 */

#include "includes.h"

#include "common.h"
#include "tls.h"
#include "tls/tlsv1_client.h"
#include "tls/tlsv1_server.h"


static int tls_ref_count = 0;

struct tls_global {
        int server;
        struct tlsv1_credentials *server_cred;
        int check_crl;
};

struct tls_connection {
        struct tlsv1_client *client;
        struct tlsv1_server *server;
};


void * tls_init(const struct tls_config *conf)
{
        struct tls_global *global;

        if (tls_ref_count == 0) {
#ifdef CONFIG_TLS_INTERNAL_CLIENT
                if (tlsv1_client_global_init())
                        return NULL;
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
                if (tlsv1_server_global_init())
                        return NULL;
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        }
        tls_ref_count++;

        global = os_zalloc(sizeof(*global));
        if (global == NULL)
                return NULL;

        return global;
}

void tls_deinit(void *ssl_ctx)
{
        struct tls_global *global = ssl_ctx;
        tls_ref_count--;
        if (tls_ref_count == 0) {
#ifdef CONFIG_TLS_INTERNAL_CLIENT
                tlsv1_client_global_deinit();
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
                tlsv1_cred_free(global->server_cred);
                tlsv1_server_global_deinit();
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        }
        os_free(global);
}


int tls_get_errors(void *tls_ctx)
{
        return 0;
}


struct tls_connection * tls_connection_init(void *tls_ctx)
{
        struct tls_connection *conn;
        struct tls_global *global = tls_ctx;

        conn = os_zalloc(sizeof(*conn));
        if (conn == NULL)
                return NULL;

#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (!global->server) {
                conn->client = tlsv1_client_init();
                if (conn->client == NULL) {
                        os_free(conn);
                        return NULL;
                }
        }
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (global->server) {
                conn->server = tlsv1_server_init(global->server_cred);
                if (conn->server == NULL) {
                        os_free(conn);
                        return NULL;
                }
        }
#endif /* CONFIG_TLS_INTERNAL_SERVER */

        return conn;
}


void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn)
{
        if (conn == NULL)
                return;
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                tlsv1_client_deinit(conn->client);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                tlsv1_server_deinit(conn->server);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        os_free(conn);
}


int tls_connection_established(void *tls_ctx, struct tls_connection *conn)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_established(conn->client);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_established(conn->server);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return 0;
}


int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_shutdown(conn->client);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_shutdown(conn->server);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
                              const struct tls_connection_params *params)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        struct tlsv1_credentials *cred;

        if (conn->client == NULL)
                return -1;

        cred = tlsv1_cred_alloc();
        if (cred == NULL)
                return -1;

        if (tlsv1_set_ca_cert(cred, params->ca_cert,
                              params->ca_cert_blob, params->ca_cert_blob_len,
                              params->ca_path)) {
                wpa_printf(MSG_INFO, "TLS: Failed to configure trusted CA "
                           "certificates");
                tlsv1_cred_free(cred);
                return -1;
        }

        if (tlsv1_set_cert(cred, params->client_cert,
                           params->client_cert_blob,
                           params->client_cert_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to configure client "
                           "certificate");
                tlsv1_cred_free(cred);
                return -1;
        }

        if (tlsv1_set_private_key(cred, params->private_key,
                                  params->private_key_passwd,
                                  params->private_key_blob,
                                  params->private_key_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to load private key");
                tlsv1_cred_free(cred);
                return -1;
        }

        if (tlsv1_set_dhparams(cred, params->dh_file, params->dh_blob,
                               params->dh_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to load DH parameters");
                tlsv1_cred_free(cred);
                return -1;
        }

        if (tlsv1_client_set_cred(conn->client, cred) < 0) {
                tlsv1_cred_free(cred);
                return -1;
        }

        return 0;
#else /* CONFIG_TLS_INTERNAL_CLIENT */
        return -1;
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
}


int tls_global_set_params(void *tls_ctx,
                          const struct tls_connection_params *params)
{
#ifdef CONFIG_TLS_INTERNAL_SERVER
        struct tls_global *global = tls_ctx;
        struct tlsv1_credentials *cred;

        /* Currently, global parameters are only set when running in server
         * mode. */
        global->server = 1;
        tlsv1_cred_free(global->server_cred);
        global->server_cred = cred = tlsv1_cred_alloc();
        if (cred == NULL)
                return -1;

        if (tlsv1_set_ca_cert(cred, params->ca_cert, params->ca_cert_blob,
                              params->ca_cert_blob_len, params->ca_path)) {
                wpa_printf(MSG_INFO, "TLS: Failed to configure trusted CA "
                           "certificates");
                return -1;
        }

        if (tlsv1_set_cert(cred, params->client_cert, params->client_cert_blob,
                           params->client_cert_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to configure server "
                           "certificate");
                return -1;
        }

        if (tlsv1_set_private_key(cred, params->private_key,
                                  params->private_key_passwd,
                                  params->private_key_blob,
                                  params->private_key_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to load private key");
                return -1;
        }

        if (tlsv1_set_dhparams(cred, params->dh_file, params->dh_blob,
                               params->dh_blob_len)) {
                wpa_printf(MSG_INFO, "TLS: Failed to load DH parameters");
                return -1;
        }

        return 0;
#else /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
#endif /* CONFIG_TLS_INTERNAL_SERVER */
}


int tls_global_set_verify(void *tls_ctx, int check_crl)
{
        struct tls_global *global = tls_ctx;
        global->check_crl = check_crl;
        return 0;
}


int tls_connection_set_verify(void *tls_ctx, struct tls_connection *conn,
                              int verify_peer)
{
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_set_verify(conn->server, verify_peer);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
                          int tls_ia)
{
        return -1;
}


int tls_connection_get_keys(void *tls_ctx, struct tls_connection *conn,
                            struct tls_keys *keys)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_get_keys(conn->client, keys);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_get_keys(conn->server, keys);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
                       const char *label, int server_random_first,
                       u8 *out, size_t out_len)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client) {
                return tlsv1_client_prf(conn->client, label,
                                        server_random_first,
                                        out, out_len);
        }
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server) {
                return tlsv1_server_prf(conn->server, label,
                                        server_random_first,
                                        out, out_len);
        }
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


struct wpabuf * tls_connection_handshake(void *tls_ctx,
                                         struct tls_connection *conn,
                                         const struct wpabuf *in_data,
                                         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;

        ad = 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);

        return out;
#else /* CONFIG_TLS_INTERNAL_CLIENT */
        return NULL;
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
}


struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
                                                struct tls_connection *conn,
                                                const struct wpabuf *in_data,
                                                struct wpabuf **appl_data)
{
#ifdef CONFIG_TLS_INTERNAL_SERVER
        u8 *res;
        size_t res_len;
        struct wpabuf *out;

        if (conn->server == NULL)
                return NULL;

        if (appl_data)
                *appl_data = NULL;

        res = tlsv1_server_handshake(conn->server, wpabuf_head(in_data),
                                     wpabuf_len(in_data), &res_len);
        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;
#endif /* CONFIG_TLS_INTERNAL_SERVER */
}


struct wpabuf * tls_connection_encrypt(void *tls_ctx,
                                       struct tls_connection *conn,
                                       const struct wpabuf *in_data)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client) {
                struct wpabuf *buf;
                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) {
                struct wpabuf *buf;
                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 NULL;
}


struct wpabuf * tls_connection_decrypt(void *tls_ctx,
                                       struct tls_connection *conn,
                                       const struct wpabuf *in_data)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client) {
                struct wpabuf *buf;
                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) {
                struct wpabuf *buf;
                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 NULL;
}


int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_resumed(conn->client);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_resumed(conn->server);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
                                   u8 *ciphers)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_set_cipher_list(conn->client, ciphers);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_set_cipher_list(conn->server, ciphers);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
                   char *buf, size_t buflen)
{
        if (conn == NULL)
                return -1;
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_get_cipher(conn->client, buf, buflen);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_get_cipher(conn->server, buf, buflen);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


int tls_connection_enable_workaround(void *tls_ctx,
                                     struct tls_connection *conn)
{
        return -1;
}


int tls_connection_client_hello_ext(void *tls_ctx, struct tls_connection *conn,
                                    int ext_type, const u8 *data,
                                    size_t data_len)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client) {
                return tlsv1_client_hello_ext(conn->client, ext_type,
                                              data, data_len);
        }
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
        return -1;
}


int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn)
{
        return 0;
}


int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn)
{
        return 0;
}


int tls_connection_get_write_alerts(void *tls_ctx,
                                    struct tls_connection *conn)
{
        return 0;
}


int tls_connection_get_keyblock_size(void *tls_ctx,
                                     struct tls_connection *conn)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client)
                return tlsv1_client_get_keyblock_size(conn->client);
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server)
                return tlsv1_server_get_keyblock_size(conn->server);
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}


unsigned int tls_capabilities(void *tls_ctx)
{
        return 0;
}


struct wpabuf * tls_connection_ia_send_phase_finished(
        void *tls_ctx, struct tls_connection *conn, int final)
{
        return NULL;
}


int tls_connection_ia_final_phase_finished(void *tls_ctx,
                                           struct tls_connection *conn)
{
        return -1;
}


int tls_connection_ia_permute_inner_secret(void *tls_ctx,
                                           struct tls_connection *conn,
                                           const u8 *key, size_t key_len)
{
        return -1;
}


int tls_connection_set_session_ticket_cb(void *tls_ctx,
                                         struct tls_connection *conn,
                                         tls_session_ticket_cb cb,
                                         void *ctx)
{
#ifdef CONFIG_TLS_INTERNAL_CLIENT
        if (conn->client) {
                tlsv1_client_set_session_ticket_cb(conn->client, cb, ctx);
                return 0;
        }
#endif /* CONFIG_TLS_INTERNAL_CLIENT */
#ifdef CONFIG_TLS_INTERNAL_SERVER
        if (conn->server) {
                tlsv1_server_set_session_ticket_cb(conn->server, cb, ctx);
                return 0;
        }
#endif /* CONFIG_TLS_INTERNAL_SERVER */
        return -1;
}