ap_config.c

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/*
 * hostapd / Configuration helper functions
 * Copyright (c) 2003-2009, 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.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "crypto/sha1.h"
#include "radius/radius_client.h"
#include "common/ieee802_11_defs.h"
#include "common/eapol_common.h"
#include "eap_common/eap_wsc_common.h"
#include "eap_server/eap.h"
#include "wpa_auth.h"
#include "sta_info.h"
#include "ap_config.h"


static void hostapd_config_free_vlan(struct hostapd_bss_config *bss)
{
        struct hostapd_vlan *vlan, *prev;

        vlan = bss->vlan;
        prev = NULL;
        while (vlan) {
                prev = vlan;
                vlan = vlan->next;
                os_free(prev);
        }

        bss->vlan = NULL;
}


void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
{
        bss->logger_syslog_level = HOSTAPD_LEVEL_INFO;
        bss->logger_stdout_level = HOSTAPD_LEVEL_INFO;
        bss->logger_syslog = (unsigned int) -1;
        bss->logger_stdout = (unsigned int) -1;

        bss->auth_algs = WPA_AUTH_ALG_OPEN | WPA_AUTH_ALG_SHARED;

        bss->wep_rekeying_period = 300;
        /* use key0 in individual key and key1 in broadcast key */
        bss->broadcast_key_idx_min = 1;
        bss->broadcast_key_idx_max = 2;
        bss->eap_reauth_period = 3600;

        bss->wpa_group_rekey = 600;
        bss->wpa_gmk_rekey = 86400;
        bss->wpa_key_mgmt = WPA_KEY_MGMT_PSK;
        bss->wpa_pairwise = WPA_CIPHER_TKIP;
        bss->wpa_group = WPA_CIPHER_TKIP;
        bss->rsn_pairwise = 0;

        bss->max_num_sta = MAX_STA_COUNT;

        bss->dtim_period = 2;

        bss->radius_server_auth_port = 1812;
        bss->ap_max_inactivity = AP_MAX_INACTIVITY;
        bss->eapol_version = EAPOL_VERSION;

        bss->max_listen_interval = 65535;

#ifdef CONFIG_IEEE80211W
        bss->assoc_sa_query_max_timeout = 1000;
        bss->assoc_sa_query_retry_timeout = 201;
#endif /* CONFIG_IEEE80211W */
#ifdef EAP_SERVER_FAST
         /* both anonymous and authenticated provisioning */
        bss->eap_fast_prov = 3;
        bss->pac_key_lifetime = 7 * 24 * 60 * 60;
        bss->pac_key_refresh_time = 1 * 24 * 60 * 60;
#endif /* EAP_SERVER_FAST */
}


struct hostapd_config * hostapd_config_defaults(void)
{
        struct hostapd_config *conf;
        struct hostapd_bss_config *bss;
        int i;
        const int aCWmin = 4, aCWmax = 10;
        const struct hostapd_wmm_ac_params ac_bk =
                { aCWmin, aCWmax, 7, 0, 0 }; /* background traffic */
        const struct hostapd_wmm_ac_params ac_be =
                { aCWmin, aCWmax, 3, 0, 0 }; /* best effort traffic */
        const struct hostapd_wmm_ac_params ac_vi = /* video traffic */
                { aCWmin - 1, aCWmin, 2, 3000 / 32, 1 };
        const struct hostapd_wmm_ac_params ac_vo = /* voice traffic */
                { aCWmin - 2, aCWmin - 1, 2, 1500 / 32, 1 };

        conf = os_zalloc(sizeof(*conf));
        bss = os_zalloc(sizeof(*bss));
        if (conf == NULL || bss == NULL) {
                wpa_printf(MSG_ERROR, "Failed to allocate memory for "
                           "configuration data.");
                os_free(conf);
                os_free(bss);
                return NULL;
        }

        bss->radius = os_zalloc(sizeof(*bss->radius));
        if (bss->radius == NULL) {
                os_free(conf);
                os_free(bss);
                return NULL;
        }

        hostapd_config_defaults_bss(bss);

        conf->num_bss = 1;
        conf->bss = bss;

        conf->beacon_int = 100;
        conf->rts_threshold = -1; /* use driver default: 2347 */
        conf->fragm_threshold = -1; /* user driver default: 2346 */
        conf->send_probe_response = 1;

        for (i = 0; i < NUM_TX_QUEUES; i++)
                conf->tx_queue[i].aifs = -1; /* use hw default */

        conf->wmm_ac_params[0] = ac_be;
        conf->wmm_ac_params[1] = ac_bk;
        conf->wmm_ac_params[2] = ac_vi;
        conf->wmm_ac_params[3] = ac_vo;

        conf->ht_capab = HT_CAP_INFO_SMPS_DISABLED;

        return conf;
}


int hostapd_mac_comp(const void *a, const void *b)
{
        return os_memcmp(a, b, sizeof(macaddr));
}


int hostapd_mac_comp_empty(const void *a)
{
        macaddr empty = { 0 };
        return os_memcmp(a, empty, sizeof(macaddr));
}


static int hostapd_config_read_wpa_psk(const char *fname,
                                       struct hostapd_ssid *ssid)
{
        FILE *f;
        char buf[128], *pos;
        int line = 0, ret = 0, len, ok;
        u8 addr[ETH_ALEN];
        struct hostapd_wpa_psk *psk;

        if (!fname)
                return 0;

        f = fopen(fname, "r");
        if (!f) {
                wpa_printf(MSG_ERROR, "WPA PSK file '%s' not found.", fname);
                return -1;
        }

        while (fgets(buf, sizeof(buf), f)) {
                line++;

                if (buf[0] == '#')
                        continue;
                pos = buf;
                while (*pos != '\0') {
                        if (*pos == '\n') {
                                *pos = '\0';
                                break;
                        }
                        pos++;
                }
                if (buf[0] == '\0')
                        continue;

                if (hwaddr_aton(buf, addr)) {
                        wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
                                   "line %d in '%s'", buf, line, fname);
                        ret = -1;
                        break;
                }

                psk = os_zalloc(sizeof(*psk));
                if (psk == NULL) {
                        wpa_printf(MSG_ERROR, "WPA PSK allocation failed");
                        ret = -1;
                        break;
                }
                if (is_zero_ether_addr(addr))
                        psk->group = 1;
                else
                        os_memcpy(psk->addr, addr, ETH_ALEN);

                pos = buf + 17;
                if (*pos == '\0') {
                        wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
                                   line, fname);
                        os_free(psk);
                        ret = -1;
                        break;
                }
                pos++;

                ok = 0;
                len = os_strlen(pos);
                if (len == 64 && hexstr2bin(pos, psk->psk, PMK_LEN) == 0)
                        ok = 1;
                else if (len >= 8 && len < 64) {
                        pbkdf2_sha1(pos, ssid->ssid, ssid->ssid_len,
                                    4096, psk->psk, PMK_LEN);
                        ok = 1;
                }
                if (!ok) {
                        wpa_printf(MSG_ERROR, "Invalid PSK '%s' on line %d in "
                                   "'%s'", pos, line, fname);
                        os_free(psk);
                        ret = -1;
                        break;
                }

                psk->next = ssid->wpa_psk;
                ssid->wpa_psk = psk;
        }

        fclose(f);

        return ret;
}


static int hostapd_derive_psk(struct hostapd_ssid *ssid)
{
        ssid->wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
        if (ssid->wpa_psk == NULL) {
                wpa_printf(MSG_ERROR, "Unable to alloc space for PSK");
                return -1;
        }
        wpa_hexdump_ascii(MSG_DEBUG, "SSID",
                          (u8 *) ssid->ssid, ssid->ssid_len);
        wpa_hexdump_ascii_key(MSG_DEBUG, "PSK (ASCII passphrase)",
                              (u8 *) ssid->wpa_passphrase,
                              os_strlen(ssid->wpa_passphrase));
        pbkdf2_sha1(ssid->wpa_passphrase,
                    ssid->ssid, ssid->ssid_len,
                    4096, ssid->wpa_psk->psk, PMK_LEN);
        wpa_hexdump_key(MSG_DEBUG, "PSK (from passphrase)",
                        ssid->wpa_psk->psk, PMK_LEN);
        return 0;
}


int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf)
{
        struct hostapd_ssid *ssid = &conf->ssid;

        if (ssid->wpa_passphrase != NULL) {
                if (ssid->wpa_psk != NULL) {
                        wpa_printf(MSG_DEBUG, "Using pre-configured WPA PSK "
                                   "instead of passphrase");
                } else {
                        wpa_printf(MSG_DEBUG, "Deriving WPA PSK based on "
                                   "passphrase");
                        if (hostapd_derive_psk(ssid) < 0)
                                return -1;
                }
                ssid->wpa_psk->group = 1;
        }

        if (ssid->wpa_psk_file) {
                if (hostapd_config_read_wpa_psk(ssid->wpa_psk_file,
                                                &conf->ssid))
                        return -1;
        }

        return 0;
}


int hostapd_wep_key_cmp(struct hostapd_wep_keys *a, struct hostapd_wep_keys *b)
{
        int i;

        if (a->idx != b->idx || a->default_len != b->default_len)
                return 1;
        for (i = 0; i < NUM_WEP_KEYS; i++)
                if (a->len[i] != b->len[i] ||
                    os_memcmp(a->key[i], b->key[i], a->len[i]) != 0)
                        return 1;
        return 0;
}


static void hostapd_config_free_radius(struct hostapd_radius_server *servers,
                                       int num_servers)
{
        int i;

        for (i = 0; i < num_servers; i++) {
                os_free(servers[i].shared_secret);
        }
        os_free(servers);
}


static void hostapd_config_free_eap_user(struct hostapd_eap_user *user)
{
        os_free(user->identity);
        os_free(user->password);
        os_free(user);
}


static void hostapd_config_free_wep(struct hostapd_wep_keys *keys)
{
        int i;
        for (i = 0; i < NUM_WEP_KEYS; i++) {
                os_free(keys->key[i]);
                keys->key[i] = NULL;
        }
}


static void hostapd_config_free_bss(struct hostapd_bss_config *conf)
{
        struct hostapd_wpa_psk *psk, *prev;
        struct hostapd_eap_user *user, *prev_user;

        if (conf == NULL)
                return;

        psk = conf->ssid.wpa_psk;
        while (psk) {
                prev = psk;
                psk = psk->next;
                os_free(prev);
        }

        os_free(conf->ssid.wpa_passphrase);
        os_free(conf->ssid.wpa_psk_file);
#ifdef CONFIG_FULL_DYNAMIC_VLAN
        os_free(conf->ssid.vlan_tagged_interface);
#endif /* CONFIG_FULL_DYNAMIC_VLAN */

        user = conf->eap_user;
        while (user) {
                prev_user = user;
                user = user->next;
                hostapd_config_free_eap_user(prev_user);
        }

        os_free(conf->dump_log_name);
        os_free(conf->eap_req_id_text);
        os_free(conf->accept_mac);
        os_free(conf->deny_mac);
        os_free(conf->nas_identifier);
        hostapd_config_free_radius(conf->radius->auth_servers,
                                   conf->radius->num_auth_servers);
        hostapd_config_free_radius(conf->radius->acct_servers,
                                   conf->radius->num_acct_servers);
        os_free(conf->rsn_preauth_interfaces);
        os_free(conf->ctrl_interface);
        os_free(conf->ca_cert);
        os_free(conf->server_cert);
        os_free(conf->private_key);
        os_free(conf->private_key_passwd);
        os_free(conf->dh_file);
        os_free(conf->pac_opaque_encr_key);
        os_free(conf->eap_fast_a_id);
        os_free(conf->eap_fast_a_id_info);
        os_free(conf->eap_sim_db);
        os_free(conf->radius_server_clients);
        os_free(conf->test_socket);
        os_free(conf->radius);
        hostapd_config_free_vlan(conf);
        if (conf->ssid.dyn_vlan_keys) {
                struct hostapd_ssid *ssid = &conf->ssid;
                size_t i;
                for (i = 0; i <= ssid->max_dyn_vlan_keys; i++) {
                        if (ssid->dyn_vlan_keys[i] == NULL)
                                continue;
                        hostapd_config_free_wep(ssid->dyn_vlan_keys[i]);
                        os_free(ssid->dyn_vlan_keys[i]);
                }
                os_free(ssid->dyn_vlan_keys);
                ssid->dyn_vlan_keys = NULL;
        }

#ifdef CONFIG_IEEE80211R
        {
                struct ft_remote_r0kh *r0kh, *r0kh_prev;
                struct ft_remote_r1kh *r1kh, *r1kh_prev;

                r0kh = conf->r0kh_list;
                conf->r0kh_list = NULL;
                while (r0kh) {
                        r0kh_prev = r0kh;
                        r0kh = r0kh->next;
                        os_free(r0kh_prev);
                }

                r1kh = conf->r1kh_list;
                conf->r1kh_list = NULL;
                while (r1kh) {
                        r1kh_prev = r1kh;
                        r1kh = r1kh->next;
                        os_free(r1kh_prev);
                }
        }
#endif /* CONFIG_IEEE80211R */

#ifdef CONFIG_WPS
        os_free(conf->wps_pin_requests);
        os_free(conf->device_name);
        os_free(conf->manufacturer);
        os_free(conf->model_name);
        os_free(conf->model_number);
        os_free(conf->serial_number);
        os_free(conf->device_type);
        os_free(conf->config_methods);
        os_free(conf->ap_pin);
        os_free(conf->extra_cred);
        os_free(conf->ap_settings);
        os_free(conf->upnp_iface);
        os_free(conf->friendly_name);
        os_free(conf->manufacturer_url);
        os_free(conf->model_description);
        os_free(conf->model_url);
        os_free(conf->upc);
#endif /* CONFIG_WPS */
}


void hostapd_config_free(struct hostapd_config *conf)
{
        size_t i;

        if (conf == NULL)
                return;

        for (i = 0; i < conf->num_bss; i++)
                hostapd_config_free_bss(&conf->bss[i]);
        os_free(conf->bss);
        os_free(conf->supported_rates);
        os_free(conf->basic_rates);

        os_free(conf);
}


int hostapd_maclist_found(struct mac_acl_entry *list, int num_entries,
                          const u8 *addr, int *vlan_id)
{
        int start, end, middle, res;

        start = 0;
        end = num_entries - 1;

        while (start <= end) {
                middle = (start + end) / 2;
                res = os_memcmp(list[middle].addr, addr, ETH_ALEN);
                if (res == 0) {
                        if (vlan_id)
                                *vlan_id = list[middle].vlan_id;
                        return 1;
                }
                if (res < 0)
                        start = middle + 1;
                else
                        end = middle - 1;
        }

        return 0;
}


int hostapd_rate_found(int *list, int rate)
{
        int i;

        if (list == NULL)
                return 0;

        for (i = 0; list[i] >= 0; i++)
                if (list[i] == rate)
                        return 1;

        return 0;
}


const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
{
        struct hostapd_vlan *v = vlan;
        while (v) {
                if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
                        return v->ifname;
                v = v->next;
        }
        return NULL;
}


const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
                           const u8 *addr, const u8 *prev_psk)
{
        struct hostapd_wpa_psk *psk;
        int next_ok = prev_psk == NULL;

        for (psk = conf->ssid.wpa_psk; psk != NULL; psk = psk->next) {
                if (next_ok &&
                    (psk->group || os_memcmp(psk->addr, addr, ETH_ALEN) == 0))
                        return psk->psk;

                if (psk->psk == prev_psk)
                        next_ok = 1;
        }

        return NULL;
}


const struct hostapd_eap_user *
hostapd_get_eap_user(const struct hostapd_bss_config *conf, const u8 *identity,
                     size_t identity_len, int phase2)
{
        struct hostapd_eap_user *user = conf->eap_user;

#ifdef CONFIG_WPS
        if (conf->wps_state && identity_len == WSC_ID_ENROLLEE_LEN &&
            os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0) {
                static struct hostapd_eap_user wsc_enrollee;
                os_memset(&wsc_enrollee, 0, sizeof(wsc_enrollee));
                wsc_enrollee.methods[0].method = eap_server_get_type(
                        "WSC", &wsc_enrollee.methods[0].vendor);
                return &wsc_enrollee;
        }

        if (conf->wps_state && conf->ap_pin &&
            identity_len == WSC_ID_REGISTRAR_LEN &&
            os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0) {
                static struct hostapd_eap_user wsc_registrar;
                os_memset(&wsc_registrar, 0, sizeof(wsc_registrar));
                wsc_registrar.methods[0].method = eap_server_get_type(
                        "WSC", &wsc_registrar.methods[0].vendor);
                wsc_registrar.password = (u8 *) conf->ap_pin;
                wsc_registrar.password_len = os_strlen(conf->ap_pin);
                return &wsc_registrar;
        }
#endif /* CONFIG_WPS */

        while (user) {
                if (!phase2 && user->identity == NULL) {
                        /* Wildcard match */
                        break;
                }

                if (user->phase2 == !!phase2 && user->wildcard_prefix &&
                    identity_len >= user->identity_len &&
                    os_memcmp(user->identity, identity, user->identity_len) ==
                    0) {
                        /* Wildcard prefix match */
                        break;
                }

                if (user->phase2 == !!phase2 &&
                    user->identity_len == identity_len &&
                    os_memcmp(user->identity, identity, identity_len) == 0)
                        break;
                user = user->next;
        }

        return user;
}