diff options
Diffstat (limited to 'extmod/modussl_mbedtls.c')
| -rw-r--r-- | extmod/modussl_mbedtls.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/extmod/modussl_mbedtls.c b/extmod/modussl_mbedtls.c new file mode 100644 index 0000000000..5a7a745d82 --- /dev/null +++ b/extmod/modussl_mbedtls.c @@ -0,0 +1,303 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2016 Linaro Ltd. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "py/mpconfig.h" +#if MICROPY_PY_USSL && MICROPY_SSL_MBEDTLS + +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include "py/nlr.h" +#include "py/runtime.h" +#include "py/stream.h" + +// mbedtls_time_t +#include "mbedtls/platform.h" +#include "mbedtls/net.h" +#include "mbedtls/ssl.h" +#include "mbedtls/x509_crt.h" +#include "mbedtls/pk.h" +#include "mbedtls/entropy.h" +#include "mbedtls/ctr_drbg.h" +#include "mbedtls/debug.h" + +typedef struct _mp_obj_ssl_socket_t { + mp_obj_base_t base; + mp_obj_t sock; + mbedtls_entropy_context entropy; + mbedtls_ctr_drbg_context ctr_drbg; + mbedtls_ssl_context ssl; + mbedtls_ssl_config conf; + mbedtls_x509_crt cacert; + mbedtls_x509_crt cert; + mbedtls_pk_context pkey; +} mp_obj_ssl_socket_t; + +struct ssl_args { + mp_arg_val_t key; + mp_arg_val_t cert; + mp_arg_val_t server_side; + mp_arg_val_t server_hostname; +}; + +STATIC const mp_obj_type_t ussl_socket_type; + +static void mbedtls_debug(void *ctx, int level, const char *file, int line, const char *str) { + printf("DBG:%s:%04d: %s\n", file, line, str); +} + +// TODO: FIXME! +int null_entropy_func(void *data, unsigned char *output, size_t len) { + // enjoy random bytes + return 0; +} + +int _mbedtls_ssl_send(void *ctx, const byte *buf, size_t len) { + mp_obj_t sock = *(mp_obj_t*)ctx; + + const mp_stream_p_t *sock_stream = mp_get_stream_raise(sock, MP_STREAM_OP_WRITE); + int err; + + int out_sz = sock_stream->write(sock, buf, len, &err); + if (out_sz == MP_STREAM_ERROR) { + return -err; + } else { + return out_sz; + } +} + +int _mbedtls_ssl_recv(void *ctx, byte *buf, size_t len) { + mp_obj_t sock = *(mp_obj_t*)ctx; + + const mp_stream_p_t *sock_stream = mp_get_stream_raise(sock, MP_STREAM_OP_READ); + int err; + + int out_sz = sock_stream->read(sock, buf, len, &err); + if (out_sz == MP_STREAM_ERROR) { + return -err; + } else { + return out_sz; + } +} + + +STATIC mp_obj_ssl_socket_t *socket_new(mp_obj_t sock, struct ssl_args *args) { + mp_obj_ssl_socket_t *o = m_new_obj(mp_obj_ssl_socket_t); + o->base.type = &ussl_socket_type; + + int ret; + mbedtls_ssl_init(&o->ssl); + mbedtls_ssl_config_init(&o->conf); + mbedtls_x509_crt_init(&o->cacert); + mbedtls_x509_crt_init(&o->cert); + mbedtls_pk_init(&o->pkey); + mbedtls_ctr_drbg_init(&o->ctr_drbg); + // Debug level (0-4) + mbedtls_debug_set_threshold(0); + + mbedtls_entropy_init(&o->entropy); + const byte seed[] = "upy"; + ret = mbedtls_ctr_drbg_seed(&o->ctr_drbg, null_entropy_func/*mbedtls_entropy_func*/, &o->entropy, seed, sizeof(seed)); + if (ret != 0) { + printf("ret=%d\n", ret); + assert(0); + } + + ret = mbedtls_ssl_config_defaults(&o->conf, + MBEDTLS_SSL_IS_CLIENT, + MBEDTLS_SSL_TRANSPORT_STREAM, + MBEDTLS_SSL_PRESET_DEFAULT); + if (ret != 0) { + assert(0); + } + + mbedtls_ssl_conf_authmode(&o->conf, MBEDTLS_SSL_VERIFY_NONE); + mbedtls_ssl_conf_rng(&o->conf, mbedtls_ctr_drbg_random, &o->ctr_drbg); + mbedtls_ssl_conf_dbg(&o->conf, mbedtls_debug, NULL); + + ret = mbedtls_ssl_setup(&o->ssl, &o->conf); + if (ret != 0) { + assert(0); + } + + if (args->server_hostname.u_obj != mp_const_none) { + const char *sni = mp_obj_str_get_str(args->server_hostname.u_obj); + ret = mbedtls_ssl_set_hostname(&o->ssl, sni); + if (ret != 0) { + assert(0); + } + } + + o->sock = sock; + mbedtls_ssl_set_bio(&o->ssl, &o->sock, _mbedtls_ssl_send, _mbedtls_ssl_recv, NULL); + + if (args->key.u_obj != MP_OBJ_NULL) { + mp_uint_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); + + mp_uint_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); + + ret = mbedtls_ssl_conf_own_cert(&o->conf, &o->cert, &o->pkey); + assert(ret == 0); + } + + if (args->server_side.u_bool) { + assert(0); + } else { + while ((ret = mbedtls_ssl_handshake(&o->ssl)) != 0) { + if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) { + //assert(0); + printf("mbedtls_ssl_handshake error: -%x\n", -ret); + mp_raise_OSError(MP_EIO); + } + } + } + + return o; +} + +STATIC void socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { + (void)kind; + mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(self_in); + mp_printf(print, "<_SSLSocket %p>", self); +} + +STATIC mp_uint_t socket_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) { + mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in); + + int ret = mbedtls_ssl_read(&o->ssl, buf, size); + if (ret >= 0) { + return ret; + } + *errcode = ret; + return MP_STREAM_ERROR; +} + +STATIC mp_uint_t socket_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) { + mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in); + + int ret = mbedtls_ssl_write(&o->ssl, buf, size); + if (ret >= 0) { + return ret; + } + *errcode = ret; + return MP_STREAM_ERROR; +} + +STATIC mp_obj_t socket_setblocking(mp_obj_t self_in, mp_obj_t flag_in) { + // Currently supports only blocking mode + (void)self_in; + if (!mp_obj_is_true(flag_in)) { + mp_not_implemented(""); + } + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_2(socket_setblocking_obj, socket_setblocking); + +STATIC mp_obj_t socket_close(mp_obj_t self_in) { + mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(self_in); + + mbedtls_x509_crt_free(&self->cacert); + mbedtls_ssl_free(&self->ssl); + mbedtls_ssl_config_free(&self->conf); + mbedtls_ctr_drbg_free(&self->ctr_drbg); + mbedtls_entropy_free(&self->entropy); + + mp_obj_t dest[2]; + mp_load_method(self->sock, MP_QSTR_close, dest); + return mp_call_method_n_kw(0, 0, dest); +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(socket_close_obj, socket_close); + +STATIC const mp_rom_map_elem_t ussl_socket_locals_dict_table[] = { + { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) }, + { MP_ROM_QSTR(MP_QSTR_readall), MP_ROM_PTR(&mp_stream_readall_obj) }, + { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) }, + { MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) }, + { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) }, + { MP_ROM_QSTR(MP_QSTR_setblocking), MP_ROM_PTR(&socket_setblocking_obj) }, + { MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&socket_close_obj) }, +}; + +STATIC MP_DEFINE_CONST_DICT(ussl_socket_locals_dict, ussl_socket_locals_dict_table); + +STATIC const mp_stream_p_t ussl_socket_stream_p = { + .read = socket_read, + .write = socket_write, +}; + +STATIC const mp_obj_type_t ussl_socket_type = { + { &mp_type_type }, + // Save on qstr's, reuse same as for module + .name = MP_QSTR_ussl, + .print = socket_print, + .getiter = NULL, + .iternext = NULL, + .protocol = &ussl_socket_stream_p, + .locals_dict = (void*)&ussl_socket_locals_dict, +}; + +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_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} }, + { MP_QSTR_server_hostname, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} }, + }; + + // TODO: Check that sock implements stream protocol + mp_obj_t sock = pos_args[0]; + + struct ssl_args args; + mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, + MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t*)&args); + + return MP_OBJ_FROM_PTR(socket_new(sock, &args)); +} +STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_ssl_wrap_socket_obj, 1, mod_ssl_wrap_socket); + +STATIC const mp_rom_map_elem_t mp_module_ssl_globals_table[] = { + { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ussl) }, + { MP_ROM_QSTR(MP_QSTR_wrap_socket), MP_ROM_PTR(&mod_ssl_wrap_socket_obj) }, +}; + +STATIC MP_DEFINE_CONST_DICT(mp_module_ssl_globals, mp_module_ssl_globals_table); + +const mp_obj_module_t mp_module_ussl = { + .base = { &mp_type_module }, + .globals = (mp_obj_dict_t*)&mp_module_ssl_globals, +}; + +#endif // MICROPY_PY_USSL |