362 lines
12 KiB
C
362 lines
12 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015-2019 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/objstr.h"
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#if MICROPY_PY_USSL && MICROPY_SSL_AXTLS
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#include "ssl.h"
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typedef struct _mp_obj_ssl_socket_t {
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mp_obj_base_t base;
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mp_obj_t sock;
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SSL_CTX *ssl_ctx;
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SSL *ssl_sock;
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byte *buf;
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uint32_t bytes_left;
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bool blocking;
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} mp_obj_ssl_socket_t;
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struct ssl_args {
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mp_arg_val_t key;
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mp_arg_val_t cert;
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mp_arg_val_t server_side;
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mp_arg_val_t server_hostname;
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mp_arg_val_t do_handshake;
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};
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STATIC const mp_obj_type_t ussl_socket_type;
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// Table of error strings corresponding to SSL_xxx error codes.
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STATIC const char *const ssl_error_tab1[] = {
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"NOT_OK",
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"DEAD",
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"CLOSE_NOTIFY",
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"EAGAIN",
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};
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STATIC const char *const ssl_error_tab2[] = {
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"CONN_LOST",
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"RECORD_OVERFLOW",
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"SOCK_SETUP_FAILURE",
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NULL,
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"INVALID_HANDSHAKE",
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"INVALID_PROT_MSG",
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"INVALID_HMAC",
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"INVALID_VERSION",
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"UNSUPPORTED_EXTENSION",
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"INVALID_SESSION",
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"NO_CIPHER",
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"INVALID_CERT_HASH_ALG",
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"BAD_CERTIFICATE",
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"INVALID_KEY",
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NULL,
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"FINISHED_INVALID",
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"NO_CERT_DEFINED",
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"NO_CLIENT_RENOG",
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"NOT_SUPPORTED",
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};
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STATIC NORETURN void ussl_raise_error(int err) {
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MP_STATIC_ASSERT(SSL_NOT_OK - 3 == SSL_EAGAIN);
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MP_STATIC_ASSERT(SSL_ERROR_CONN_LOST - 18 == SSL_ERROR_NOT_SUPPORTED);
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// Check if err corresponds to something in one of the error string tables.
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const char *errstr = NULL;
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if (SSL_NOT_OK >= err && err >= SSL_EAGAIN) {
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errstr = ssl_error_tab1[SSL_NOT_OK - err];
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} else if (SSL_ERROR_CONN_LOST >= err && err >= SSL_ERROR_NOT_SUPPORTED) {
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errstr = ssl_error_tab2[SSL_ERROR_CONN_LOST - err];
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}
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// Unknown error, just raise the error code.
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if (errstr == NULL) {
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mp_raise_OSError(err);
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}
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// Construct string object.
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mp_obj_str_t *o_str = m_new_obj_maybe(mp_obj_str_t);
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if (o_str == NULL) {
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mp_raise_OSError(err);
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}
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o_str->base.type = &mp_type_str;
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o_str->data = (const byte *)errstr;
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o_str->len = strlen((char *)o_str->data);
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o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
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// Raise OSError(err, str).
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mp_obj_t args[2] = { MP_OBJ_NEW_SMALL_INT(err), MP_OBJ_FROM_PTR(o_str)};
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nlr_raise(mp_obj_exception_make_new(&mp_type_OSError, 2, 0, args));
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}
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STATIC mp_obj_ssl_socket_t *ussl_socket_new(mp_obj_t sock, struct ssl_args *args) {
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#if MICROPY_PY_USSL_FINALISER
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mp_obj_ssl_socket_t *o = m_new_obj_with_finaliser(mp_obj_ssl_socket_t);
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#else
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mp_obj_ssl_socket_t *o = m_new_obj(mp_obj_ssl_socket_t);
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#endif
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o->base.type = &ussl_socket_type;
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o->buf = NULL;
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o->bytes_left = 0;
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o->sock = sock;
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o->blocking = true;
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uint32_t options = SSL_SERVER_VERIFY_LATER;
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if (!args->do_handshake.u_bool) {
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options |= SSL_CONNECT_IN_PARTS;
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}
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if (args->key.u_obj != mp_const_none) {
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options |= SSL_NO_DEFAULT_KEY;
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}
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if ((o->ssl_ctx = ssl_ctx_new(options, SSL_DEFAULT_CLNT_SESS)) == NULL) {
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mp_raise_OSError(MP_EINVAL);
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}
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if (args->key.u_obj != mp_const_none) {
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size_t len;
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const byte *data = (const byte *)mp_obj_str_get_data(args->key.u_obj, &len);
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int res = ssl_obj_memory_load(o->ssl_ctx, SSL_OBJ_RSA_KEY, data, len, NULL);
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if (res != SSL_OK) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid key"));
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}
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data = (const byte *)mp_obj_str_get_data(args->cert.u_obj, &len);
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res = ssl_obj_memory_load(o->ssl_ctx, SSL_OBJ_X509_CERT, data, len, NULL);
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if (res != SSL_OK) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid cert"));
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}
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}
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if (args->server_side.u_bool) {
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o->ssl_sock = ssl_server_new(o->ssl_ctx, (long)sock);
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} else {
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SSL_EXTENSIONS *ext = ssl_ext_new();
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if (args->server_hostname.u_obj != mp_const_none) {
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ext->host_name = (char *)mp_obj_str_get_str(args->server_hostname.u_obj);
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}
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o->ssl_sock = ssl_client_new(o->ssl_ctx, (long)sock, NULL, 0, ext);
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if (args->do_handshake.u_bool) {
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int r = ssl_handshake_status(o->ssl_sock);
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if (r != SSL_OK) {
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if (r == SSL_CLOSE_NOTIFY) { // EOF
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r = MP_ENOTCONN;
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} else if (r == SSL_EAGAIN) {
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r = MP_EAGAIN;
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}
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ussl_raise_error(r);
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}
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}
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}
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return o;
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}
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STATIC void ussl_socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind;
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mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "<_SSLSocket %p>", self->ssl_sock);
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}
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STATIC mp_uint_t ussl_socket_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
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mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
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if (o->ssl_sock == NULL) {
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*errcode = EBADF;
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return MP_STREAM_ERROR;
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}
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while (o->bytes_left == 0) {
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mp_int_t r = ssl_read(o->ssl_sock, &o->buf);
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if (r == SSL_OK) {
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// SSL_OK from ssl_read() means "everything is ok, but there's
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// no user data yet". It may happen e.g. if handshake is not
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// finished yet. The best way we can treat it is by returning
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// EAGAIN. This may be a bit unexpected in blocking mode, but
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// default is to perform complete handshake in constructor, so
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// this should not happen in blocking mode. On the other hand,
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// in nonblocking mode EAGAIN (comparing to the alternative of
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// looping) is really preferrable.
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if (o->blocking) {
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continue;
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} else {
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goto eagain;
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}
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}
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if (r < 0) {
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if (r == SSL_CLOSE_NOTIFY || r == SSL_ERROR_CONN_LOST) {
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// EOF
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return 0;
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}
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if (r == SSL_EAGAIN) {
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eagain:
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r = MP_EAGAIN;
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}
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*errcode = r;
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return MP_STREAM_ERROR;
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}
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o->bytes_left = r;
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}
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if (size > o->bytes_left) {
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size = o->bytes_left;
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}
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memcpy(buf, o->buf, size);
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o->buf += size;
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o->bytes_left -= size;
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return size;
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}
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STATIC mp_uint_t ussl_socket_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
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mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
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if (o->ssl_sock == NULL) {
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*errcode = EBADF;
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return MP_STREAM_ERROR;
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}
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mp_int_t r;
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eagain:
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r = ssl_write(o->ssl_sock, buf, size);
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if (r == 0) {
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// see comment in ussl_socket_read above
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if (o->blocking) {
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goto eagain;
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} else {
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r = SSL_EAGAIN;
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}
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}
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if (r < 0) {
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if (r == SSL_CLOSE_NOTIFY || r == SSL_ERROR_CONN_LOST) {
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return 0; // EOF
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}
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if (r == SSL_EAGAIN) {
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r = MP_EAGAIN;
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}
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*errcode = r;
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return MP_STREAM_ERROR;
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}
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return r;
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}
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STATIC mp_uint_t ussl_socket_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
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mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(o_in);
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if (request == MP_STREAM_CLOSE && self->ssl_sock != NULL) {
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ssl_free(self->ssl_sock);
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ssl_ctx_free(self->ssl_ctx);
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self->ssl_sock = NULL;
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}
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// Pass all requests down to the underlying socket
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return mp_get_stream(self->sock)->ioctl(self->sock, request, arg, errcode);
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}
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STATIC mp_obj_t ussl_socket_setblocking(mp_obj_t self_in, mp_obj_t flag_in) {
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mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(self_in);
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mp_obj_t sock = o->sock;
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mp_obj_t dest[3];
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mp_load_method(sock, MP_QSTR_setblocking, dest);
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dest[2] = flag_in;
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mp_obj_t res = mp_call_method_n_kw(1, 0, dest);
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o->blocking = mp_obj_is_true(flag_in);
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return res;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(ussl_socket_setblocking_obj, ussl_socket_setblocking);
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STATIC const mp_rom_map_elem_t ussl_socket_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
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{ MP_ROM_QSTR(MP_QSTR_setblocking), MP_ROM_PTR(&ussl_socket_setblocking_obj) },
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{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
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#if MICROPY_PY_USSL_FINALISER
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mp_stream_close_obj) },
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#endif
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};
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STATIC MP_DEFINE_CONST_DICT(ussl_socket_locals_dict, ussl_socket_locals_dict_table);
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STATIC const mp_stream_p_t ussl_socket_stream_p = {
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.read = ussl_socket_read,
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.write = ussl_socket_write,
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.ioctl = ussl_socket_ioctl,
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};
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STATIC const mp_obj_type_t ussl_socket_type = {
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{ &mp_type_type },
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// Save on qstr's, reuse same as for module
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.name = MP_QSTR_ussl,
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.print = ussl_socket_print,
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.getiter = NULL,
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.iternext = NULL,
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.protocol = &ussl_socket_stream_p,
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.locals_dict = (void *)&ussl_socket_locals_dict,
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};
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STATIC mp_obj_t mod_ssl_wrap_socket(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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// TODO: Implement more args
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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{ MP_QSTR_cert, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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{ MP_QSTR_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
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{ MP_QSTR_server_hostname, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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{ MP_QSTR_do_handshake, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
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};
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// TODO: Check that sock implements stream protocol
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mp_obj_t sock = pos_args[0];
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struct ssl_args args;
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args,
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MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t *)&args);
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return MP_OBJ_FROM_PTR(ussl_socket_new(sock, &args));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_ssl_wrap_socket_obj, 1, mod_ssl_wrap_socket);
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STATIC const mp_rom_map_elem_t mp_module_ssl_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ussl) },
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{ MP_ROM_QSTR(MP_QSTR_wrap_socket), MP_ROM_PTR(&mod_ssl_wrap_socket_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_ssl_globals, mp_module_ssl_globals_table);
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const mp_obj_module_t mp_module_ussl = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t *)&mp_module_ssl_globals,
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};
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#endif // MICROPY_PY_USSL
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