static unsigned int psk_client_callback(SSL *ssl, const char *hint,
char *identity, unsigned int max_identity_len,
unsigned char *psk, unsigned int max_psk_len)
{
struct mosquitto *mosq;
int len;
mosq = SSL_get_ex_data(ssl, tls_ex_index_mosq);
if(!mosq) return 0;
snprintf(identity, max_identity_len, "%s", mosq->tls_psk_identity);
len = _mosquitto_hex2bin(mosq->tls_psk, psk, max_psk_len);
if (len < 0) return 0;
return len;
}
static unsigned int psk_server_callback(SSL *ssl, const char *identity, unsigned char *psk, unsigned int max_psk_len)
{
struct _mosquitto_db *db;
struct mosquitto *context;
struct _mqtt3_listener *listener;
char *psk_key = NULL;
int len;
const char *psk_hint;
if(!identity) return 0;
db = _mosquitto_get_db();
context = SSL_get_ex_data(ssl, tls_ex_index_context);
if(!context) return 0;
listener = SSL_get_ex_data(ssl, tls_ex_index_listener);
if(!listener) return 0;
psk_hint = listener->psk_hint;
/* The hex to BN conversion results in the length halving, so we can pass
* max_psk_len*2 as the max hex key here. */
psk_key = _mosquitto_calloc(1, max_psk_len*2 + 1);
if(!psk_key) return 0;
if(mosquitto_psk_key_get(db, psk_hint, identity, psk_key, max_psk_len*2) != MOSQ_ERR_SUCCESS){
return 0;
}
len = _mosquitto_hex2bin(psk_key, psk, max_psk_len);
if (len < 0) return 0;
if(listener->use_identity_as_username){
context->username = _mosquitto_strdup(identity);
if(!context->username) return 0;
}
return len;
}
