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micropython/extmod/modssl_mbedtls.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Linaro Ltd.
* Copyright (c) 2019 Paul Sokolovsky
* Copyright (c) 2023 Damien P. George
*
* 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_SSL && MICROPY_SSL_MBEDTLS
#include <stdio.h>
#include <string.h>
#include <errno.h> // needed because mp_is_nonblocking_error uses system error codes
#include "py/runtime.h"
#include "py/stream.h"
#include "py/objstr.h"
#include "py/reader.h"
#include "extmod/vfs.h"
// mbedtls_time_t
#include "mbedtls/platform.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"
#include "mbedtls/error.h"
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
#include "mbedtls/build_info.h"
#else
#include "mbedtls/version.h"
#endif
#define MP_STREAM_POLL_RDWR (MP_STREAM_POLL_RD | MP_STREAM_POLL_WR)
// This corresponds to an SSLContext object.
typedef struct _mp_obj_ssl_context_t {
mp_obj_base_t base;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_config conf;
mbedtls_x509_crt cacert;
mbedtls_x509_crt cert;
mbedtls_pk_context pkey;
int authmode;
int *ciphersuites;
} mp_obj_ssl_context_t;
// This corresponds to an SSLSocket object.
typedef struct _mp_obj_ssl_socket_t {
mp_obj_base_t base;
mp_obj_ssl_context_t *ssl_context;
mp_obj_t sock;
mbedtls_ssl_context ssl;
uintptr_t poll_mask; // Indicates which read or write operations the protocol needs next
int last_error; // The last error code, if any
} mp_obj_ssl_socket_t;
STATIC const mp_obj_type_t ssl_context_type;
STATIC const mp_obj_type_t ssl_socket_type;
STATIC const MP_DEFINE_STR_OBJ(mbedtls_version_obj, MBEDTLS_VERSION_STRING_FULL);
STATIC mp_obj_t ssl_socket_make_new(mp_obj_ssl_context_t *ssl_context, mp_obj_t sock,
bool server_side, bool do_handshake_on_connect, mp_obj_t server_hostname);
/******************************************************************************/
// Helper functions.
STATIC mp_obj_t read_file(mp_obj_t self_in) {
// file = open(args[0], "rb")
mp_obj_t f_args[2] = {
self_in,
MP_OBJ_NEW_QSTR(MP_QSTR_rb),
};
mp_obj_t file = mp_vfs_open(2, &f_args[0], (mp_map_t *)&mp_const_empty_map);
// data = file.read()
mp_obj_t dest[2];
mp_load_method(file, MP_QSTR_read, dest);
mp_obj_t data = mp_call_method_n_kw(0, 0, dest);
// file.close()
mp_stream_close(file);
return data;
}
#ifdef MBEDTLS_DEBUG_C
STATIC void mbedtls_debug(void *ctx, int level, const char *file, int line, const char *str) {
(void)ctx;
(void)level;
mp_printf(&mp_plat_print, "DBG:%s:%04d: %s\n", file, line, str);
}
#endif
STATIC NORETURN void mbedtls_raise_error(int err) {
// Handle special cases.
if (err == MBEDTLS_ERR_SSL_ALLOC_FAILED) {
mp_raise_OSError(MP_ENOMEM);
} else if (err == MBEDTLS_ERR_PK_BAD_INPUT_DATA) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid key"));
} else if (err == MBEDTLS_ERR_X509_BAD_INPUT_DATA) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid cert"));
}
// _mbedtls_ssl_send and _mbedtls_ssl_recv (below) turn positive error codes from the
// underlying socket into negative codes to pass them through mbedtls. Here we turn them
// positive again so they get interpreted as the OSError they really are. The
// cut-off of -256 is a bit hacky, sigh.
if (err < 0 && err > -256) {
mp_raise_OSError(-err);
}
#if defined(MBEDTLS_ERROR_C)
// Including mbedtls_strerror takes about 1.5KB due to the error strings.
// MBEDTLS_ERROR_C is the define used by mbedtls to conditionally include mbedtls_strerror.
// It is set/unset in the MBEDTLS_CONFIG_FILE which is defined in the Makefile.
// Try to allocate memory for the message
#define ERR_STR_MAX 80 // mbedtls_strerror truncates if it doesn't fit
mp_obj_str_t *o_str = m_new_obj_maybe(mp_obj_str_t);
byte *o_str_buf = m_new_maybe(byte, ERR_STR_MAX);
if (o_str == NULL || o_str_buf == NULL) {
mp_raise_OSError(err);
}
// print the error message into the allocated buffer
mbedtls_strerror(err, (char *)o_str_buf, ERR_STR_MAX);
size_t len = strlen((char *)o_str_buf);
// Put the exception object together
o_str->base.type = &mp_type_str;
o_str->data = o_str_buf;
o_str->len = len;
o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
// raise
mp_obj_t args[2] = { MP_OBJ_NEW_SMALL_INT(err), MP_OBJ_FROM_PTR(o_str)};
nlr_raise(mp_obj_exception_make_new(&mp_type_OSError, 2, 0, args));
#else
// mbedtls is compiled without error strings so we simply return the err number
mp_raise_OSError(err); // err is typically a large negative number
#endif
}
STATIC void ssl_check_async_handshake_failure(mp_obj_ssl_socket_t *sslsock, int *errcode) {
if (
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
(*errcode < 0) && (mbedtls_ssl_is_handshake_over(&sslsock->ssl) == 0) && (*errcode != MBEDTLS_ERR_SSL_CONN_EOF)
#else
(*errcode < 0) && (*errcode != MBEDTLS_ERR_SSL_CONN_EOF)
#endif
) {
// Asynchronous handshake is done by mbdetls_ssl_read/write. If the return code is
// MBEDTLS_ERR_XX (i.e < 0) and the handshake is not done due to a handshake failure,
// then notify peer with proper error code and raise local error with mbedtls_raise_error.
if (*errcode == MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE) {
// Check if TLSv1.3 and use proper alert for this case (to be implemented)
// uint8_t alert = MBEDTLS_SSL_ALERT_MSG_CERT_REQUIRED; tlsv1.3
// uint8_t alert = MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE; tlsv1.2
mbedtls_ssl_send_alert_message(&sslsock->ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
}
if (*errcode == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED) {
// The certificate may have been rejected for several reasons.
char xcbuf[256];
uint32_t flags = mbedtls_ssl_get_verify_result(&sslsock->ssl);
int ret = mbedtls_x509_crt_verify_info(xcbuf, sizeof(xcbuf), "\n", flags);
// The length of the string written (not including the terminated nul byte),
// or a negative err code.
if (ret > 0) {
sslsock->sock = MP_OBJ_NULL;
mbedtls_ssl_free(&sslsock->ssl);
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("%s"), xcbuf);
}
}
sslsock->sock = MP_OBJ_NULL;
mbedtls_ssl_free(&sslsock->ssl);
mbedtls_raise_error(*errcode);
}
}
/******************************************************************************/
// SSLContext type.
STATIC mp_obj_t ssl_context_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 1, false);
// This is the "protocol" argument.
mp_int_t endpoint = mp_obj_get_int(args[0]);
// Create SSLContext object.
#if MICROPY_PY_SSL_FINALISER
mp_obj_ssl_context_t *self = m_new_obj_with_finaliser(mp_obj_ssl_context_t);
#else
mp_obj_ssl_context_t *self = m_new_obj(mp_obj_ssl_context_t);
#endif
self->base.type = type_in;
// Initialise mbedTLS state.
mbedtls_ssl_config_init(&self->conf);
mbedtls_entropy_init(&self->entropy);
mbedtls_ctr_drbg_init(&self->ctr_drbg);
mbedtls_x509_crt_init(&self->cacert);
mbedtls_x509_crt_init(&self->cert);
mbedtls_pk_init(&self->pkey);
self->ciphersuites = NULL;
#ifdef MBEDTLS_DEBUG_C
// Debug level (0-4) 1=warning, 2=info, 3=debug, 4=verbose
mbedtls_debug_set_threshold(3);
#endif
// Whenever the PSA interface is used (if MBEDTLS_PSA_CRYPTO), psa_crypto_init() needs to be called before any TLS related operations.
// TLSv1.3 depends on the PSA interface, TLSv1.2 only uses the PSA stack if MBEDTLS_USE_PSA_CRYPTO is defined.
#if defined(MBEDTLS_SSL_PROTO_TLS1_3) || defined(MBEDTLS_USE_PSA_CRYPTO)
psa_crypto_init();
#endif
const byte seed[] = "upy";
int ret = mbedtls_ctr_drbg_seed(&self->ctr_drbg, mbedtls_entropy_func, &self->entropy, seed, sizeof(seed));
if (ret != 0) {
mbedtls_raise_error(ret);
}
ret = mbedtls_ssl_config_defaults(&self->conf, endpoint,
MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT);
if (ret != 0) {
mbedtls_raise_error(ret);
}
if (endpoint == MBEDTLS_SSL_IS_CLIENT) {
// The CPython default is MBEDTLS_SSL_VERIFY_REQUIRED, but to maintain
// backwards compatibility we use MBEDTLS_SSL_VERIFY_NONE for now.
self->authmode = MBEDTLS_SSL_VERIFY_NONE;
} else {
self->authmode = MBEDTLS_SSL_VERIFY_NONE;
}
mbedtls_ssl_conf_authmode(&self->conf, self->authmode);
mbedtls_ssl_conf_rng(&self->conf, mbedtls_ctr_drbg_random, &self->ctr_drbg);
#ifdef MBEDTLS_DEBUG_C
mbedtls_ssl_conf_dbg(&self->conf, mbedtls_debug, NULL);
#endif
return MP_OBJ_FROM_PTR(self);
}
STATIC void ssl_context_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
mp_obj_ssl_context_t *self = MP_OBJ_TO_PTR(self_in);
if (dest[0] == MP_OBJ_NULL) {
// Load attribute.
if (attr == MP_QSTR_verify_mode) {
dest[0] = MP_OBJ_NEW_SMALL_INT(self->authmode);
} else {
// Continue lookup in locals_dict.
dest[1] = MP_OBJ_SENTINEL;
}
} else if (dest[1] != MP_OBJ_NULL) {
// Store attribute.
if (attr == MP_QSTR_verify_mode) {
self->authmode = mp_obj_get_int(dest[1]);
dest[0] = MP_OBJ_NULL;
mbedtls_ssl_conf_authmode(&self->conf, self->authmode);
}
}
}
#if MICROPY_PY_SSL_FINALISER
STATIC mp_obj_t ssl_context___del__(mp_obj_t self_in) {
mp_obj_ssl_context_t *self = MP_OBJ_TO_PTR(self_in);
mbedtls_pk_free(&self->pkey);
mbedtls_x509_crt_free(&self->cert);
mbedtls_x509_crt_free(&self->cacert);
mbedtls_ctr_drbg_free(&self->ctr_drbg);
mbedtls_entropy_free(&self->entropy);
mbedtls_ssl_config_free(&self->conf);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ssl_context___del___obj, ssl_context___del__);
#endif
// SSLContext.get_ciphers()
STATIC mp_obj_t ssl_context_get_ciphers(mp_obj_t self_in) {
mp_obj_t list = mp_obj_new_list(0, NULL);
for (const int *cipher_list = mbedtls_ssl_list_ciphersuites(); *cipher_list; ++cipher_list) {
const char *cipher_name = mbedtls_ssl_get_ciphersuite_name(*cipher_list);
mp_obj_list_append(list, MP_OBJ_FROM_PTR(mp_obj_new_str(cipher_name, strlen(cipher_name))));
cipher_list++;
if (!*cipher_list) {
break;
}
}
return list;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ssl_context_get_ciphers_obj, ssl_context_get_ciphers);
// SSLContext.set_ciphers(ciphersuite)
STATIC mp_obj_t ssl_context_set_ciphers(mp_obj_t self_in, mp_obj_t ciphersuite) {
mp_obj_ssl_context_t *ssl_context = MP_OBJ_TO_PTR(self_in);
// Check that ciphersuite is a list or tuple.
size_t len = 0;
mp_obj_t *ciphers;
mp_obj_get_array(ciphersuite, &len, &ciphers);
if (len == 0) {
mbedtls_raise_error(MBEDTLS_ERR_SSL_BAD_CONFIG);
}
// Parse list of ciphers.
ssl_context->ciphersuites = m_new(int, len + 1);
for (size_t i = 0; i < len; ++i) {
const char *ciphername = mp_obj_str_get_str(ciphers[i]);
const int id = mbedtls_ssl_get_ciphersuite_id(ciphername);
if (id == 0) {
mbedtls_raise_error(MBEDTLS_ERR_SSL_BAD_CONFIG);
}
ssl_context->ciphersuites[i] = id;
}
ssl_context->ciphersuites[len] = 0;
// Configure ciphersuite.
mbedtls_ssl_conf_ciphersuites(&ssl_context->conf, (const int *)ssl_context->ciphersuites);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(ssl_context_set_ciphers_obj, ssl_context_set_ciphers);
STATIC void ssl_context_load_key(mp_obj_ssl_context_t *self, mp_obj_t key_obj, mp_obj_t cert_obj) {
size_t key_len;
const byte *key = (const byte *)mp_obj_str_get_data(key_obj, &key_len);
// len should include terminating null
int ret;
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
ret = mbedtls_pk_parse_key(&self->pkey, key, key_len + 1, NULL, 0, mbedtls_ctr_drbg_random, &self->ctr_drbg);
#else
ret = mbedtls_pk_parse_key(&self->pkey, key, key_len + 1, NULL, 0);
#endif
if (ret != 0) {
mbedtls_raise_error(MBEDTLS_ERR_PK_BAD_INPUT_DATA); // use general error for all key errors
}
size_t cert_len;
const byte *cert = (const byte *)mp_obj_str_get_data(cert_obj, &cert_len);
// len should include terminating null
ret = mbedtls_x509_crt_parse(&self->cert, cert, cert_len + 1);
if (ret != 0) {
mbedtls_raise_error(MBEDTLS_ERR_X509_BAD_INPUT_DATA); // use general error for all cert errors
}
ret = mbedtls_ssl_conf_own_cert(&self->conf, &self->cert, &self->pkey);
if (ret != 0) {
mbedtls_raise_error(ret);
}
}
// SSLContext.load_cert_chain(certfile, keyfile)
STATIC mp_obj_t ssl_context_load_cert_chain(mp_obj_t self_in, mp_obj_t certfile, mp_obj_t keyfile) {
mp_obj_ssl_context_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_t pkey;
mp_obj_t cert;
if (certfile != mp_const_none) {
// check if key is a string/path
if (!(mp_obj_is_type(keyfile, &mp_type_bytes))) {
pkey = read_file(keyfile);
} else {
pkey = keyfile;
}
// check if cert is a string/path
if (!(mp_obj_is_type(certfile, &mp_type_bytes))) {
cert = read_file(certfile);
} else {
cert = certfile;
}
ssl_context_load_key(self, pkey, cert);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(ssl_context_load_cert_chain_obj, ssl_context_load_cert_chain);
STATIC void ssl_context_load_cadata(mp_obj_ssl_context_t *self, mp_obj_t cadata_obj) {
size_t cacert_len;
const byte *cacert = (const byte *)mp_obj_str_get_data(cadata_obj, &cacert_len);
// len should include terminating null
int ret = mbedtls_x509_crt_parse(&self->cacert, cacert, cacert_len + 1);
if (ret != 0) {
mbedtls_raise_error(MBEDTLS_ERR_X509_BAD_INPUT_DATA); // use general error for all cert errors
}
mbedtls_ssl_conf_ca_chain(&self->conf, &self->cacert, NULL);
}
// SSLContext.load_verify_locations(cafile=None, *, cadata=None)
STATIC mp_obj_t ssl_context_load_verify_locations(size_t n_args, const mp_obj_t *pos_args,
mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_cafile, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
{ MP_QSTR_cadata, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
};
mp_obj_ssl_context_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// cafile
if (args[0].u_obj != mp_const_none) {
ssl_context_load_cadata(self, read_file(args[0].u_obj));
}
// cadata
if (args[1].u_obj != mp_const_none) {
ssl_context_load_cadata(self, args[1].u_obj);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(ssl_context_load_verify_locations_obj, 1, ssl_context_load_verify_locations);
STATIC mp_obj_t ssl_context_wrap_socket(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_server_side, ARG_do_handshake_on_connect, ARG_server_hostname };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_do_handshake_on_connect, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
{ MP_QSTR_server_hostname, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
};
// Parse arguments.
mp_obj_ssl_context_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_obj_t sock = pos_args[1];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 2, pos_args + 2, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// Create and return the new SSLSocket object.
return ssl_socket_make_new(self, sock, args[ARG_server_side].u_bool,
args[ARG_do_handshake_on_connect].u_bool, args[ARG_server_hostname].u_obj);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(ssl_context_wrap_socket_obj, 2, ssl_context_wrap_socket);
STATIC const mp_rom_map_elem_t ssl_context_locals_dict_table[] = {
#if MICROPY_PY_SSL_FINALISER
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&ssl_context___del___obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_get_ciphers), MP_ROM_PTR(&ssl_context_get_ciphers_obj)},
{ MP_ROM_QSTR(MP_QSTR_set_ciphers), MP_ROM_PTR(&ssl_context_set_ciphers_obj)},
{ MP_ROM_QSTR(MP_QSTR_load_cert_chain), MP_ROM_PTR(&ssl_context_load_cert_chain_obj)},
{ MP_ROM_QSTR(MP_QSTR_load_verify_locations), MP_ROM_PTR(&ssl_context_load_verify_locations_obj)},
{ MP_ROM_QSTR(MP_QSTR_wrap_socket), MP_ROM_PTR(&ssl_context_wrap_socket_obj) },
};
STATIC MP_DEFINE_CONST_DICT(ssl_context_locals_dict, ssl_context_locals_dict_table);
STATIC MP_DEFINE_CONST_OBJ_TYPE(
ssl_context_type,
MP_QSTR_SSLContext,
MP_TYPE_FLAG_NONE,
make_new, ssl_context_make_new,
attr, ssl_context_attr,
locals_dict, &ssl_context_locals_dict
);
/******************************************************************************/
// SSLSocket type.
STATIC 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(sock);
int err;
mp_uint_t out_sz = sock_stream->write(sock, buf, len, &err);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(err)) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
return -err; // convert an MP_ERRNO to something mbedtls passes through as error
} else {
return out_sz;
}
}
// _mbedtls_ssl_recv is called by mbedtls to receive bytes from the underlying socket
STATIC 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(sock);
int err;
mp_uint_t out_sz = sock_stream->read(sock, buf, len, &err);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(err)) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
return -err;
} else {
return out_sz;
}
}
STATIC mp_obj_t ssl_socket_make_new(mp_obj_ssl_context_t *ssl_context, mp_obj_t sock,
bool server_side, bool do_handshake_on_connect, mp_obj_t server_hostname) {
// Verify the socket object has the full stream protocol
mp_get_stream_raise(sock, MP_STREAM_OP_READ | MP_STREAM_OP_WRITE | MP_STREAM_OP_IOCTL);
#if MICROPY_PY_SSL_FINALISER
mp_obj_ssl_socket_t *o = m_new_obj_with_finaliser(mp_obj_ssl_socket_t);
#else
mp_obj_ssl_socket_t *o = m_new_obj(mp_obj_ssl_socket_t);
#endif
o->base.type = &ssl_socket_type;
o->ssl_context = ssl_context;
o->sock = sock;
o->poll_mask = 0;
o->last_error = 0;
int ret;
uint32_t flags = 0;
mbedtls_ssl_init(&o->ssl);
ret = mbedtls_ssl_setup(&o->ssl, &ssl_context->conf);
if (ret != 0) {
goto cleanup;
}
if (server_hostname != mp_const_none) {
const char *sni = mp_obj_str_get_str(server_hostname);
ret = mbedtls_ssl_set_hostname(&o->ssl, sni);
if (ret != 0) {
goto cleanup;
}
} else if (ssl_context->authmode == MBEDTLS_SSL_VERIFY_REQUIRED && server_side == false) {
o->sock = MP_OBJ_NULL;
mbedtls_ssl_free(&o->ssl);
mp_raise_ValueError(MP_ERROR_TEXT("CERT_REQUIRED requires server_hostname"));
}
mbedtls_ssl_set_bio(&o->ssl, &o->sock, _mbedtls_ssl_send, _mbedtls_ssl_recv, NULL);
if (do_handshake_on_connect) {
while ((ret = mbedtls_ssl_handshake(&o->ssl)) != 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
goto cleanup;
}
mp_event_wait_ms(1);
}
}
return MP_OBJ_FROM_PTR(o);
cleanup:
if (ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED) {
flags = mbedtls_ssl_get_verify_result(&o->ssl);
}
o->sock = MP_OBJ_NULL;
mbedtls_ssl_free(&o->ssl);
if (ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED) {
char xcbuf[256];
int ret_info = mbedtls_x509_crt_verify_info(xcbuf, sizeof(xcbuf), "\n", flags);
// The length of the string written (not including the terminated nul byte),
// or a negative err code.
if (ret_info > 0) {
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("%s"), xcbuf);
}
}
mbedtls_raise_error(ret);
}
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
STATIC mp_obj_t mod_ssl_getpeercert(mp_obj_t o_in, mp_obj_t binary_form) {
mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
if (!mp_obj_is_true(binary_form)) {
mp_raise_NotImplementedError(NULL);
}
const mbedtls_x509_crt *peer_cert = mbedtls_ssl_get_peer_cert(&o->ssl);
if (peer_cert == NULL) {
return mp_const_none;
}
return mp_obj_new_bytes(peer_cert->raw.p, peer_cert->raw.len);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_ssl_getpeercert_obj, mod_ssl_getpeercert);
#endif
STATIC mp_obj_t mod_ssl_cipher(mp_obj_t o_in) {
mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
const char *cipher_suite = mbedtls_ssl_get_ciphersuite(&o->ssl);
const char *tls_version = mbedtls_ssl_get_version(&o->ssl);
mp_obj_t tuple[2] = {mp_obj_new_str(cipher_suite, strlen(cipher_suite)),
mp_obj_new_str(tls_version, strlen(tls_version))};
return mp_obj_new_tuple(2, tuple);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_ssl_cipher_obj, mod_ssl_cipher);
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);
o->poll_mask = 0;
if (o->last_error) {
*errcode = o->last_error;
return MP_STREAM_ERROR;
}
int ret = mbedtls_ssl_read(&o->ssl, buf, size);
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
// end of stream
return 0;
}
if (ret >= 0) {
return ret;
}
if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
ret = MP_EWOULDBLOCK;
} else if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
// If handshake is not finished, read attempt may end up in protocol
// wanting to write next handshake message. The same may happen with
// renegotiation.
ret = MP_EWOULDBLOCK;
o->poll_mask = MP_STREAM_POLL_WR;
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
} else if (ret == MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET) {
// It appears a new session ticket being issued by the server right after
// completed handshake is not uncommon and shouldn't be treated as fatal.
// mbedtls itself states "This error code is experimental and may be
// changed or removed without notice."
ret = MP_EWOULDBLOCK;
#endif
} else {
o->last_error = ret;
}
ssl_check_async_handshake_failure(o, &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);
o->poll_mask = 0;
if (o->last_error) {
*errcode = o->last_error;
return MP_STREAM_ERROR;
}
int ret = mbedtls_ssl_write(&o->ssl, buf, size);
if (ret >= 0) {
return ret;
}
if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
ret = MP_EWOULDBLOCK;
} else if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
// If handshake is not finished, write attempt may end up in protocol
// wanting to read next handshake message. The same may happen with
// renegotiation.
ret = MP_EWOULDBLOCK;
o->poll_mask = MP_STREAM_POLL_RD;
} else {
o->last_error = ret;
}
ssl_check_async_handshake_failure(o, &ret);
*errcode = ret;
return MP_STREAM_ERROR;
}
STATIC mp_obj_t socket_setblocking(mp_obj_t self_in, mp_obj_t flag_in) {
mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(self_in);
mp_obj_t sock = o->sock;
mp_obj_t dest[3];
mp_load_method(sock, MP_QSTR_setblocking, dest);
dest[2] = flag_in;
return mp_call_method_n_kw(1, 0, dest);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(socket_setblocking_obj, socket_setblocking);
STATIC mp_uint_t socket_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(o_in);
mp_uint_t ret = 0;
uintptr_t saved_arg = 0;
mp_obj_t sock = self->sock;
if (request == MP_STREAM_CLOSE) {
if (sock == MP_OBJ_NULL) {
// Already closed socket, do nothing.
return 0;
}
self->sock = MP_OBJ_NULL;
mbedtls_ssl_free(&self->ssl);
} else if (request == MP_STREAM_POLL) {
if (sock == MP_OBJ_NULL || self->last_error != 0) {
// Closed or error socket, return NVAL flag.
return MP_STREAM_POLL_NVAL;
}
// If the library signaled us that it needs reading or writing, only check that direction,
// but save what the caller asked because we need to restore it later
if (self->poll_mask && (arg & MP_STREAM_POLL_RDWR)) {
saved_arg = arg & MP_STREAM_POLL_RDWR;
arg = (arg & ~saved_arg) | self->poll_mask;
}
// Take into account that the library might have buffered data already
int has_pending = 0;
if (arg & MP_STREAM_POLL_RD) {
has_pending = mbedtls_ssl_check_pending(&self->ssl);
if (has_pending) {
ret |= MP_STREAM_POLL_RD;
if (arg == MP_STREAM_POLL_RD) {
// Shortcut if we only need to read and we have buffered data, no need to go to the underlying socket
return MP_STREAM_POLL_RD;
}
}
}
} else {
// Unsupported ioctl.
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
// Pass all requests down to the underlying socket
ret |= mp_get_stream(sock)->ioctl(sock, request, arg, errcode);
if (request == MP_STREAM_POLL) {
// The direction the library needed is available, return a fake result to the caller so that
// it reenters a read or a write to allow the handshake to progress
if (ret & self->poll_mask) {
ret |= saved_arg;
}
}
return ret;
}
STATIC const mp_rom_map_elem_t ssl_socket_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_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(&mp_stream_close_obj) },
#if MICROPY_PY_SSL_FINALISER
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mp_stream_close_obj) },
#endif
#if MICROPY_UNIX_COVERAGE
{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&mp_stream_ioctl_obj) },
#endif
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
{ MP_ROM_QSTR(MP_QSTR_getpeercert), MP_ROM_PTR(&mod_ssl_getpeercert_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_cipher), MP_ROM_PTR(&mod_ssl_cipher_obj) },
};
STATIC MP_DEFINE_CONST_DICT(ssl_socket_locals_dict, ssl_socket_locals_dict_table);
STATIC const mp_stream_p_t ssl_socket_stream_p = {
.read = socket_read,
.write = socket_write,
.ioctl = socket_ioctl,
};
STATIC MP_DEFINE_CONST_OBJ_TYPE(
ssl_socket_type,
MP_QSTR_SSLSocket,
MP_TYPE_FLAG_NONE,
protocol, &ssl_socket_stream_p,
locals_dict, &ssl_socket_locals_dict
);
/******************************************************************************/
// ssl module.
STATIC mp_obj_t mod_ssl_wrap_socket(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum {
ARG_key,
ARG_cert,
ARG_server_side,
ARG_server_hostname,
ARG_cert_reqs,
ARG_cadata,
ARG_do_handshake,
};
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
{ MP_QSTR_cert, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
{ 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_NONE} },
{ MP_QSTR_cert_reqs, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = MBEDTLS_SSL_VERIFY_NONE}},
{ MP_QSTR_cadata, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
{ MP_QSTR_do_handshake, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
};
// Parse arguments.
mp_obj_t sock = pos_args[0];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// Create SSLContext.
mp_int_t protocol = args[ARG_server_side].u_bool ? MBEDTLS_SSL_IS_SERVER : MBEDTLS_SSL_IS_CLIENT;
mp_obj_t ssl_context_args[1] = { MP_OBJ_NEW_SMALL_INT(protocol) };
mp_obj_ssl_context_t *ssl_context = MP_OBJ_TO_PTR(ssl_context_make_new(&ssl_context_type, 1, 0, ssl_context_args));
// Load key and cert if given.
if (args[ARG_key].u_obj != mp_const_none) {
ssl_context_load_key(ssl_context, args[ARG_key].u_obj, args[ARG_cert].u_obj);
}
// Set the verify_mode.
mp_obj_t dest[2] = { MP_OBJ_SENTINEL, MP_OBJ_NEW_SMALL_INT(args[ARG_cert_reqs].u_int) };
ssl_context_attr(MP_OBJ_FROM_PTR(ssl_context), MP_QSTR_verify_mode, dest);
// Load cadata if given.
if (args[ARG_cadata].u_obj != mp_const_none) {
ssl_context_load_cadata(ssl_context, args[ARG_cadata].u_obj);
}
// Create and return the new SSLSocket object.
return ssl_socket_make_new(ssl_context, sock, args[ARG_server_side].u_bool,
args[ARG_do_handshake].u_bool, args[ARG_server_hostname].u_obj);
}
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_ssl) },
// Functions.
{ MP_ROM_QSTR(MP_QSTR_wrap_socket), MP_ROM_PTR(&mod_ssl_wrap_socket_obj) },
// Classes.
{ MP_ROM_QSTR(MP_QSTR_SSLContext), MP_ROM_PTR(&ssl_context_type) },
// Constants.
{ MP_ROM_QSTR(MP_QSTR_MBEDTLS_VERSION), MP_ROM_PTR(&mbedtls_version_obj)},
{ MP_ROM_QSTR(MP_QSTR_PROTOCOL_TLS_CLIENT), MP_ROM_INT(MBEDTLS_SSL_IS_CLIENT) },
{ MP_ROM_QSTR(MP_QSTR_PROTOCOL_TLS_SERVER), MP_ROM_INT(MBEDTLS_SSL_IS_SERVER) },
{ MP_ROM_QSTR(MP_QSTR_CERT_NONE), MP_ROM_INT(MBEDTLS_SSL_VERIFY_NONE) },
{ MP_ROM_QSTR(MP_QSTR_CERT_OPTIONAL), MP_ROM_INT(MBEDTLS_SSL_VERIFY_OPTIONAL) },
{ MP_ROM_QSTR(MP_QSTR_CERT_REQUIRED), MP_ROM_INT(MBEDTLS_SSL_VERIFY_REQUIRED) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_ssl_globals, mp_module_ssl_globals_table);
const mp_obj_module_t mp_module_ssl = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&mp_module_ssl_globals,
};
MP_REGISTER_EXTENSIBLE_MODULE(MP_QSTR_ssl, mp_module_ssl);
#endif // MICROPY_PY_SSL && MICROPY_SSL_MBEDTLS
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