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extmod/modussl_mbedtls: Check for invalid key/cert data.

This commit is contained in:
Damien George 2019-10-31 16:22:42 +11:00
parent 07ea81fbc5
commit 9dd9f9ff06
1 changed files with 18 additions and 6 deletions
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24
extmod/modussl_mbedtls.c
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@ -169,21 +169,29 @@ STATIC mp_obj_ssl_socket_t *socket_new(mp_obj_t sock, struct ssl_args *args) {
mbedtls_ssl_set_bio(&o->ssl, &o->sock, _mbedtls_ssl_send, _mbedtls_ssl_recv, NULL);
if (args->key.u_obj != MP_OBJ_NULL) {
if (args->key.u_obj != mp_const_none) {
size_t key_len;
const byte *key = (const byte*)mp_obj_str_get_data(args->key.u_obj, &key_len);
// len should include terminating null
ret = mbedtls_pk_parse_key(&o->pkey, key, key_len + 1, NULL, 0);
assert(ret == 0);
if (ret != 0) {
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA; // use general error for all key errors
goto cleanup;
}
size_t cert_len;
const byte *cert = (const byte*)mp_obj_str_get_data(args->cert.u_obj, &cert_len);
// len should include terminating null
ret = mbedtls_x509_crt_parse(&o->cert, cert, cert_len + 1);
assert(ret == 0);
if (ret != 0) {
ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA; // use general error for all cert errors
goto cleanup;
}
ret = mbedtls_ssl_conf_own_cert(&o->conf, &o->cert, &o->pkey);
assert(ret == 0);
if (ret != 0) {
goto cleanup;
}
}
if (args->do_handshake.u_bool) {
@ -208,6 +216,10 @@ cleanup:
if (ret == MBEDTLS_ERR_SSL_ALLOC_FAILED) {
mp_raise_OSError(MP_ENOMEM);
} else if (ret == MBEDTLS_ERR_PK_BAD_INPUT_DATA) {
mp_raise_ValueError("invalid key");
} else if (ret == MBEDTLS_ERR_X509_BAD_INPUT_DATA) {
mp_raise_ValueError("invalid cert");
} else {
mp_raise_OSError(MP_EIO);
}
@ -334,8 +346,8 @@ STATIC const mp_obj_type_t ussl_socket_type = {
STATIC mp_obj_t mod_ssl_wrap_socket(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
// TODO: Implement more args
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_cert, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
{ MP_QSTR_cert, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
{ MP_QSTR_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_server_hostname, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
{ MP_QSTR_do_handshake, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },