/*
 * Authentication server setup
 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "crypto/crypto.h"
#include "crypto/tls.h"
#include "eap_server/eap.h"
#include "eap_server/eap_sim_db.h"
#include "eapol_auth/eapol_auth_sm.h"
#include "radius/radius_server.h"
#include "hostapd.h"
#include "ap_config.h"
#include "sta_info.h"
#include "authsrv.h"


#if defined(EAP_SERVER_SIM) || defined(EAP_SERVER_AKA)
#define EAP_SIM_DB
#endif /* EAP_SERVER_SIM || EAP_SERVER_AKA */


#ifdef EAP_SIM_DB
static int hostapd_sim_db_cb_sta(struct hostapd_data *hapd,
				 struct sta_info *sta, void *ctx)
{
	if (eapol_auth_eap_pending_cb(sta->eapol_sm, ctx) == 0)
		return 1;
	return 0;
}


static void hostapd_sim_db_cb(void *ctx, void *session_ctx)
{
	struct hostapd_data *hapd = ctx;
	if (ap_for_each_sta(hapd, hostapd_sim_db_cb_sta, session_ctx) == 0) {
#ifdef RADIUS_SERVER
		radius_server_eap_pending_cb(hapd->radius_srv, session_ctx);
#endif /* RADIUS_SERVER */
	}
}
#endif /* EAP_SIM_DB */


#ifdef RADIUS_SERVER

static int hostapd_radius_get_eap_user(void *ctx, const u8 *identity,
				       size_t identity_len, int phase2,
				       struct eap_user *user)
{
	const struct hostapd_eap_user *eap_user;
	int i;
	int rv = -1;

	eap_user = hostapd_get_eap_user(ctx, identity, identity_len, phase2);
	if (eap_user == NULL)
		goto out;

	if (user == NULL)
		return 0;

	os_memset(user, 0, sizeof(*user));
	for (i = 0; i < EAP_MAX_METHODS; i++) {
		user->methods[i].vendor = eap_user->methods[i].vendor;
		user->methods[i].method = eap_user->methods[i].method;
	}

	if (eap_user->password) {
		user->password = os_memdup(eap_user->password,
					   eap_user->password_len);
		if (user->password == NULL)
			goto out;
		user->password_len = eap_user->password_len;
		user->password_hash = eap_user->password_hash;
		if (eap_user->salt && eap_user->salt_len) {
			user->salt = os_memdup(eap_user->salt,
					       eap_user->salt_len);
			if (!user->salt)
				goto out;
			user->salt_len = eap_user->salt_len;
		}
	}
	user->force_version = eap_user->force_version;
	user->macacl = eap_user->macacl;
	user->ttls_auth = eap_user->ttls_auth;
	user->remediation = eap_user->remediation;
	user->accept_attr = eap_user->accept_attr;
	user->t_c_timestamp = eap_user->t_c_timestamp;
	rv = 0;

out:
	if (rv)
		wpa_printf(MSG_DEBUG, "%s: Failed to find user", __func__);

	return rv;
}


static int hostapd_setup_radius_srv(struct hostapd_data *hapd)
{
	struct radius_server_conf srv;
	struct hostapd_bss_config *conf = hapd->conf;
	os_memset(&srv, 0, sizeof(srv));
	srv.client_file = conf->radius_server_clients;
	srv.auth_port = conf->radius_server_auth_port;
	srv.acct_port = conf->radius_server_acct_port;
	srv.conf_ctx = hapd;
	srv.ipv6 = conf->radius_server_ipv6;
	srv.get_eap_user = hostapd_radius_get_eap_user;
	srv.eap_req_id_text = conf->eap_req_id_text;
	srv.eap_req_id_text_len = conf->eap_req_id_text_len;
	srv.sqlite_file = conf->eap_user_sqlite;
#ifdef CONFIG_RADIUS_TEST
	srv.dump_msk_file = conf->dump_msk_file;
#endif /* CONFIG_RADIUS_TEST */
#ifdef CONFIG_HS20
	srv.subscr_remediation_url = conf->subscr_remediation_url;
	srv.subscr_remediation_method = conf->subscr_remediation_method;
	srv.hs20_sim_provisioning_url = conf->hs20_sim_provisioning_url;
	srv.t_c_server_url = conf->t_c_server_url;
#endif /* CONFIG_HS20 */
	srv.erp_domain = conf->erp_domain;
	srv.eap_cfg = hapd->eap_cfg;

	hapd->radius_srv = radius_server_init(&srv);
	if (hapd->radius_srv == NULL) {
		wpa_printf(MSG_ERROR, "RADIUS server initialization failed.");
		return -1;
	}

	return 0;
}

#endif /* RADIUS_SERVER */


#ifdef EAP_TLS_FUNCS
static void authsrv_tls_event(void *ctx, enum tls_event ev,
			      union tls_event_data *data)
{
	switch (ev) {
	case TLS_CERT_CHAIN_SUCCESS:
		wpa_printf(MSG_DEBUG, "authsrv: remote certificate verification success");
		break;
	case TLS_CERT_CHAIN_FAILURE:
		wpa_printf(MSG_INFO, "authsrv: certificate chain failure: reason=%d depth=%d subject='%s' err='%s'",
			   data->cert_fail.reason,
			   data->cert_fail.depth,
			   data->cert_fail.subject,
			   data->cert_fail.reason_txt);
		break;
	case TLS_PEER_CERTIFICATE:
		wpa_printf(MSG_DEBUG, "authsrv: peer certificate: depth=%d serial_num=%s subject=%s",
			   data->peer_cert.depth,
			   data->peer_cert.serial_num ? data->peer_cert.serial_num : "N/A",
			   data->peer_cert.subject);
		break;
	case TLS_ALERT:
		if (data->alert.is_local)
			wpa_printf(MSG_DEBUG, "authsrv: local TLS alert: %s",
				   data->alert.description);
		else
			wpa_printf(MSG_DEBUG, "authsrv: remote TLS alert: %s",
				   data->alert.description);
		break;
	case TLS_UNSAFE_RENEGOTIATION_DISABLED:
		/* Not applicable to TLS server */
		break;
	}
}
#endif /* EAP_TLS_FUNCS */


static struct eap_config * authsrv_eap_config(struct hostapd_data *hapd)
{
	struct eap_config *cfg;

	cfg = os_zalloc(sizeof(*cfg));
	if (!cfg)
		return NULL;

	cfg->eap_server = hapd->conf->eap_server;
	cfg->ssl_ctx = hapd->ssl_ctx;
	cfg->msg_ctx = hapd->msg_ctx;
	cfg->eap_sim_db_priv = hapd->eap_sim_db_priv;
	cfg->tls_session_lifetime = hapd->conf->tls_session_lifetime;
	cfg->tls_flags = hapd->conf->tls_flags;
	cfg->max_auth_rounds = hapd->conf->max_auth_rounds;
	cfg->max_auth_rounds_short = hapd->conf->max_auth_rounds_short;
	if (hapd->conf->pac_opaque_encr_key)
		cfg->pac_opaque_encr_key =
			os_memdup(hapd->conf->pac_opaque_encr_key, 16);
	if (hapd->conf->eap_fast_a_id) {
		cfg->eap_fast_a_id = os_memdup(hapd->conf->eap_fast_a_id,
					       hapd->conf->eap_fast_a_id_len);
		cfg->eap_fast_a_id_len = hapd->conf->eap_fast_a_id_len;
	}
	if (hapd->conf->eap_fast_a_id_info)
		cfg->eap_fast_a_id_info =
			os_strdup(hapd->conf->eap_fast_a_id_info);
	cfg->eap_fast_prov = hapd->conf->eap_fast_prov;
	cfg->pac_key_lifetime = hapd->conf->pac_key_lifetime;
	cfg->pac_key_refresh_time = hapd->conf->pac_key_refresh_time;
	cfg->eap_teap_auth = hapd->conf->eap_teap_auth;
	cfg->eap_teap_pac_no_inner = hapd->conf->eap_teap_pac_no_inner;
	cfg->eap_teap_separate_result = hapd->conf->eap_teap_separate_result;
	cfg->eap_teap_id = hapd->conf->eap_teap_id;
	cfg->eap_teap_method_sequence = hapd->conf->eap_teap_method_sequence;
	cfg->eap_sim_aka_result_ind = hapd->conf->eap_sim_aka_result_ind;
	cfg->eap_sim_id = hapd->conf->eap_sim_id;
	cfg->imsi_privacy_key = hapd->imsi_privacy_key;
	cfg->tnc = hapd->conf->tnc;
	cfg->wps = hapd->wps;
	cfg->fragment_size = hapd->conf->fragment_size;
	cfg->pwd_group = hapd->conf->pwd_group;
	cfg->pbc_in_m1 = hapd->conf->pbc_in_m1;
	if (hapd->conf->server_id) {
		cfg->server_id = (u8 *) os_strdup(hapd->conf->server_id);
		cfg->server_id_len = os_strlen(hapd->conf->server_id);
	} else {
		cfg->server_id = (u8 *) os_strdup("hostapd");
		cfg->server_id_len = 7;
	}
	cfg->erp = hapd->conf->eap_server_erp;
#ifdef CONFIG_TESTING_OPTIONS
	cfg->skip_prot_success = hapd->conf->eap_skip_prot_success;
#endif /* CONFIG_TESTING_OPTIONS */

	return cfg;
}


int authsrv_init(struct hostapd_data *hapd)
{
#ifdef EAP_TLS_FUNCS
	if (hapd->conf->eap_server &&
	    (hapd->conf->ca_cert || hapd->conf->server_cert ||
	     hapd->conf->private_key || hapd->conf->dh_file ||
	     hapd->conf->server_cert2 || hapd->conf->private_key2)) {
		struct tls_config conf;
		struct tls_connection_params params;

		os_memset(&conf, 0, sizeof(conf));
		conf.tls_session_lifetime = hapd->conf->tls_session_lifetime;
		if (hapd->conf->crl_reload_interval > 0 &&
		    hapd->conf->check_crl <= 0) {
			wpa_printf(MSG_INFO,
				   "Cannot enable CRL reload functionality - it depends on check_crl being set");
		} else if (hapd->conf->crl_reload_interval > 0) {
			conf.crl_reload_interval =
				hapd->conf->crl_reload_interval;
			wpa_printf(MSG_INFO,
				   "Enabled CRL reload functionality");
		}
		conf.tls_flags = hapd->conf->tls_flags;
		conf.event_cb = authsrv_tls_event;
		conf.cb_ctx = hapd;
		hapd->ssl_ctx = tls_init(&conf);
		if (hapd->ssl_ctx == NULL) {
			wpa_printf(MSG_ERROR, "Failed to initialize TLS");
			authsrv_deinit(hapd);
			return -1;
		}

		os_memset(&params, 0, sizeof(params));
		params.ca_cert = hapd->conf->ca_cert;
		params.client_cert = hapd->conf->server_cert;
		params.client_cert2 = hapd->conf->server_cert2;
		params.private_key = hapd->conf->private_key;
		params.private_key2 = hapd->conf->private_key2;
		params.private_key_passwd = hapd->conf->private_key_passwd;
		params.private_key_passwd2 = hapd->conf->private_key_passwd2;
		params.dh_file = hapd->conf->dh_file;
		params.openssl_ciphers = hapd->conf->openssl_ciphers;
		params.openssl_ecdh_curves = hapd->conf->openssl_ecdh_curves;
		params.ocsp_stapling_response =
			hapd->conf->ocsp_stapling_response;
		params.ocsp_stapling_response_multi =
			hapd->conf->ocsp_stapling_response_multi;
		params.check_cert_subject = hapd->conf->check_cert_subject;

		if (tls_global_set_params(hapd->ssl_ctx, &params)) {
			wpa_printf(MSG_ERROR, "Failed to set TLS parameters");
			authsrv_deinit(hapd);
			return -1;
		}

		if (tls_global_set_verify(hapd->ssl_ctx,
					  hapd->conf->check_crl,
					  hapd->conf->check_crl_strict)) {
			wpa_printf(MSG_ERROR, "Failed to enable check_crl");
			authsrv_deinit(hapd);
			return -1;
		}
	}
#endif /* EAP_TLS_FUNCS */

#ifdef CRYPTO_RSA_OAEP_SHA256
	crypto_rsa_key_free(hapd->imsi_privacy_key);
	hapd->imsi_privacy_key = NULL;
	if (hapd->conf->imsi_privacy_key) {
		hapd->imsi_privacy_key = crypto_rsa_key_read(
			hapd->conf->imsi_privacy_key, true);
		if (!hapd->imsi_privacy_key) {
			wpa_printf(MSG_ERROR,
				   "Failed to read/parse IMSI privacy key %s",
				   hapd->conf->imsi_privacy_key);
			authsrv_deinit(hapd);
			return -1;
		}
	}
#endif /* CRYPTO_RSA_OAEP_SHA256 */

#ifdef EAP_SIM_DB
	if (hapd->conf->eap_sim_db) {
		hapd->eap_sim_db_priv =
			eap_sim_db_init(hapd->conf->eap_sim_db,
					hapd->conf->eap_sim_db_timeout,
					hostapd_sim_db_cb, hapd);
		if (hapd->eap_sim_db_priv == NULL) {
			wpa_printf(MSG_ERROR, "Failed to initialize EAP-SIM "
				   "database interface");
			authsrv_deinit(hapd);
			return -1;
		}
	}
#endif /* EAP_SIM_DB */

	hapd->eap_cfg = authsrv_eap_config(hapd);
	if (!hapd->eap_cfg) {
		wpa_printf(MSG_ERROR,
			   "Failed to build EAP server configuration");
		authsrv_deinit(hapd);
		return -1;
	}

#ifdef RADIUS_SERVER
	if (hapd->conf->radius_server_clients &&
	    hostapd_setup_radius_srv(hapd))
		return -1;
#endif /* RADIUS_SERVER */

	return 0;
}


void authsrv_deinit(struct hostapd_data *hapd)
{
#ifdef RADIUS_SERVER
	radius_server_deinit(hapd->radius_srv);
	hapd->radius_srv = NULL;
#endif /* RADIUS_SERVER */

#ifdef CRYPTO_RSA_OAEP_SHA256
	crypto_rsa_key_free(hapd->imsi_privacy_key);
	hapd->imsi_privacy_key = NULL;
#endif /* CRYPTO_RSA_OAEP_SHA256 */

#ifdef EAP_TLS_FUNCS
	if (hapd->ssl_ctx) {
		tls_deinit(hapd->ssl_ctx);
		hapd->ssl_ctx = NULL;
	}
#endif /* EAP_TLS_FUNCS */

#ifdef EAP_SIM_DB
	if (hapd->eap_sim_db_priv) {
		eap_sim_db_deinit(hapd->eap_sim_db_priv);
		hapd->eap_sim_db_priv = NULL;
	}
#endif /* EAP_SIM_DB */

	eap_server_config_free(hapd->eap_cfg);
	hapd->eap_cfg = NULL;
}