/**
* Create new empty session.
* @return New session pointer.
*/
struct zsession *session_create()
{
struct zsession *sess = malloc(sizeof(*sess));
bzero(sess, sizeof(*sess));
sess->client = client_create();
client_session_add(sess->client, sess);
// set default values
sess->refcnt = 1; // caller references this entry
pthread_spin_init(&sess->_nat_lock, PTHREAD_PROCESS_PRIVATE);
pthread_rwlock_init(&sess->lock_client, NULL);
__atomic_add_fetch(&zinst()->sessions_cnt, 1, __ATOMIC_RELAXED);
__atomic_add_fetch(&zinst()->unauth_sessions_cnt, 1, __ATOMIC_RELAXED);
return sess;
}
/**
* Authenticate and set client info.
* @param[in] sess Client session.
* @return Zero on success (or one of *_RC).
*/
static int session_authenticate(struct zsession *sess)
{
int ret = OTHER_RC;
VALUE_PAIR *request_attrs = NULL, *response_attrs = NULL, *attrs = NULL;
char msg[8192]; // WARNING: libfreeradius-client has unsafe working with this buffer.
rc_handle *rh = zinst()->radh;
struct in_addr ip_addr;
char ip_str[INET_ADDRSTRLEN];
struct zcrules rules;
crules_init(&rules);
ip_addr.s_addr = htonl(sess->ip);
if (unlikely(NULL == inet_ntop(AF_INET, &ip_addr, ip_str, sizeof(ip_str)))) {
goto end;
}
if (unlikely(NULL == rc_avpair_add(rh, &request_attrs, PW_USER_NAME, ip_str, -1, 0))) {
goto end;
}
if (unlikely(NULL == rc_avpair_add(rh, &request_attrs, PW_USER_PASSWORD, "", -1, 0))) {
goto end;
}
if (unlikely(NULL == rc_avpair_add(rh, &request_attrs, PW_NAS_IDENTIFIER, zcfg()->radius_nas_identifier, -1, 0))) {
goto end;
}
if (unlikely(NULL == rc_avpair_add(rh, &request_attrs, PW_CALLING_STATION_ID, ip_str, -1, 0))) {
goto end;
}
ret = rc_auth(rh, 0, request_attrs, &response_attrs, msg);
if (OK_RC != ret) {
ZERO_LOG(LOG_ERR, "Session authentication failed for %s (code:%d)", ip_str, ret);
goto end;
}
attrs = response_attrs;
while (likely(NULL != attrs)) {
switch (attrs->attribute) {
case PW_FILTER_ID:
crules_parse(&rules, attrs->strvalue);
break;
case PW_SESSION_TIMEOUT:
atomic_store_explicit(&sess->max_duration, SEC2USEC(attrs->lvalue), memory_order_release);
break;
case PW_ACCT_INTERIM_INTERVAL:
atomic_store_explicit(&sess->acct_interval, SEC2USEC(attrs->lvalue), memory_order_release);
break;
}
attrs = attrs->next;
}
if (likely(rules.have.user_id && rules.have.login)) {
struct zclient *client = sess->client;
client_db_find_or_set_id(zinst()->client_db, rules.user_id, &client);
if (client != sess->client) {
// found
pthread_rwlock_wrlock(&sess->lock_client);
atomic_fetch_add_explicit(&client->refcnt, 1, memory_order_relaxed);
client_release(sess->client);
sess->client = client;
client_session_add(sess->client, sess);
pthread_rwlock_unlock(&sess->lock_client);
} else {
client_apply_rules(sess->client, &rules);
}
atomic_fetch_sub_explicit(&zinst()->unauth_sessions_cnt, 1, memory_order_release);
// log successful authentication
{
UT_string rules_str;
utstring_init(&rules_str);
utstring_reserve(&rules_str, 1024);
attrs = response_attrs;
while (likely(NULL != attrs)) {
switch (attrs->attribute) {
case PW_FILTER_ID:
utstring_printf(&rules_str, " %s", attrs->strvalue);
break;
default:
break;
}
attrs = attrs->next;
}
zero_syslog(LOG_INFO, "Authenticated session %s (rules:%s)", ip_str, utstring_body(&rules_str));
utstring_done(&rules_str);
}
} else {
ret = OTHER_RC;
ZERO_LOG(LOG_ERR, "Session authentication failed for %s (code:%d)", ip_str, ret);
}
end:
crules_free(&rules);
if (request_attrs) rc_avpair_free(request_attrs);
if (response_attrs) rc_avpair_free(response_attrs);
return ret;
}
