1 /*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2015-2019 Paul Sokolovsky
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #include <stdio.h>
28 #include <string.h>
29
30 #include "py/runtime.h"
31 #include "py/stream.h"
32 #include "py/objstr.h"
33
34 #if MICROPY_PY_USSL && MICROPY_SSL_AXTLS
35
36 #include "ssl.h"
37
38 typedef struct _mp_obj_ssl_socket_t {
39 mp_obj_base_t base;
40 mp_obj_t sock;
41 SSL_CTX *ssl_ctx;
42 SSL *ssl_sock;
43 byte *buf;
44 uint32_t bytes_left;
45 bool blocking;
46 } mp_obj_ssl_socket_t;
47
48 struct ssl_args {
49 mp_arg_val_t key;
50 mp_arg_val_t cert;
51 mp_arg_val_t server_side;
52 mp_arg_val_t server_hostname;
53 mp_arg_val_t do_handshake;
54 };
55
56 STATIC const mp_obj_type_t ussl_socket_type;
57
58 // Table of error strings corresponding to SSL_xxx error codes.
59 STATIC const char *const ssl_error_tab1[] = {
60 "NOT_OK",
61 "DEAD",
62 "CLOSE_NOTIFY",
63 "EAGAIN",
64 };
65 STATIC const char *const ssl_error_tab2[] = {
66 "CONN_LOST",
67 "RECORD_OVERFLOW",
68 "SOCK_SETUP_FAILURE",
69 NULL,
70 "INVALID_HANDSHAKE",
71 "INVALID_PROT_MSG",
72 "INVALID_HMAC",
73 "INVALID_VERSION",
74 "UNSUPPORTED_EXTENSION",
75 "INVALID_SESSION",
76 "NO_CIPHER",
77 "INVALID_CERT_HASH_ALG",
78 "BAD_CERTIFICATE",
79 "INVALID_KEY",
80 NULL,
81 "FINISHED_INVALID",
82 "NO_CERT_DEFINED",
83 "NO_CLIENT_RENOG",
84 "NOT_SUPPORTED",
85 };
86
ussl_raise_error(int err)87 STATIC NORETURN void ussl_raise_error(int err) {
88 MP_STATIC_ASSERT(SSL_NOT_OK - 3 == SSL_EAGAIN);
89 MP_STATIC_ASSERT(SSL_ERROR_CONN_LOST - 18 == SSL_ERROR_NOT_SUPPORTED);
90
91 // Check if err corresponds to something in one of the error string tables.
92 const char *errstr = NULL;
93 if (SSL_NOT_OK >= err && err >= SSL_EAGAIN) {
94 errstr = ssl_error_tab1[SSL_NOT_OK - err];
95 } else if (SSL_ERROR_CONN_LOST >= err && err >= SSL_ERROR_NOT_SUPPORTED) {
96 errstr = ssl_error_tab2[SSL_ERROR_CONN_LOST - err];
97 }
98
99 // Unknown error, just raise the error code.
100 if (errstr == NULL) {
101 mp_raise_OSError(err);
102 }
103
104 // Construct string object.
105 mp_obj_str_t *o_str = m_new_obj_maybe(mp_obj_str_t);
106 if (o_str == NULL) {
107 mp_raise_OSError(err);
108 }
109 o_str->base.type = &mp_type_str;
110 o_str->data = (const byte *)errstr;
111 o_str->len = strlen((char *)o_str->data);
112 o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
113
114 // Raise OSError(err, str).
115 mp_obj_t args[2] = { MP_OBJ_NEW_SMALL_INT(err), MP_OBJ_FROM_PTR(o_str)};
116 nlr_raise(mp_obj_exception_make_new(&mp_type_OSError, 2, 0, args));
117 }
118
119
ussl_socket_new(mp_obj_t sock,struct ssl_args * args)120 STATIC mp_obj_ssl_socket_t *ussl_socket_new(mp_obj_t sock, struct ssl_args *args) {
121 #if MICROPY_PY_USSL_FINALISER
122 mp_obj_ssl_socket_t *o = m_new_obj_with_finaliser(mp_obj_ssl_socket_t);
123 #else
124 mp_obj_ssl_socket_t *o = m_new_obj(mp_obj_ssl_socket_t);
125 #endif
126 o->base.type = &ussl_socket_type;
127 o->buf = NULL;
128 o->bytes_left = 0;
129 o->sock = sock;
130 o->blocking = true;
131
132 uint32_t options = SSL_SERVER_VERIFY_LATER;
133 if (!args->do_handshake.u_bool) {
134 options |= SSL_CONNECT_IN_PARTS;
135 }
136 if (args->key.u_obj != mp_const_none) {
137 options |= SSL_NO_DEFAULT_KEY;
138 }
139 if ((o->ssl_ctx = ssl_ctx_new(options, SSL_DEFAULT_CLNT_SESS)) == NULL) {
140 mp_raise_OSError(MP_EINVAL);
141 }
142
143 if (args->key.u_obj != mp_const_none) {
144 size_t len;
145 const byte *data = (const byte *)mp_obj_str_get_data(args->key.u_obj, &len);
146 int res = ssl_obj_memory_load(o->ssl_ctx, SSL_OBJ_RSA_KEY, data, len, NULL);
147 if (res != SSL_OK) {
148 mp_raise_ValueError(MP_ERROR_TEXT("invalid key"));
149 }
150
151 data = (const byte *)mp_obj_str_get_data(args->cert.u_obj, &len);
152 res = ssl_obj_memory_load(o->ssl_ctx, SSL_OBJ_X509_CERT, data, len, NULL);
153 if (res != SSL_OK) {
154 mp_raise_ValueError(MP_ERROR_TEXT("invalid cert"));
155 }
156 }
157
158 if (args->server_side.u_bool) {
159 o->ssl_sock = ssl_server_new(o->ssl_ctx, (long)sock);
160 } else {
161 SSL_EXTENSIONS *ext = ssl_ext_new();
162
163 if (args->server_hostname.u_obj != mp_const_none) {
164 ext->host_name = (char *)mp_obj_str_get_str(args->server_hostname.u_obj);
165 }
166
167 o->ssl_sock = ssl_client_new(o->ssl_ctx, (long)sock, NULL, 0, ext);
168
169 if (args->do_handshake.u_bool) {
170 int r = ssl_handshake_status(o->ssl_sock);
171
172 if (r != SSL_OK) {
173 if (r == SSL_CLOSE_NOTIFY) { // EOF
174 r = MP_ENOTCONN;
175 } else if (r == SSL_EAGAIN) {
176 r = MP_EAGAIN;
177 }
178 ussl_raise_error(r);
179 }
180 }
181
182 }
183
184 return o;
185 }
186
ussl_socket_print(const mp_print_t * print,mp_obj_t self_in,mp_print_kind_t kind)187 STATIC void ussl_socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
188 (void)kind;
189 mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(self_in);
190 mp_printf(print, "<_SSLSocket %p>", self->ssl_sock);
191 }
192
ussl_socket_read(mp_obj_t o_in,void * buf,mp_uint_t size,int * errcode)193 STATIC mp_uint_t ussl_socket_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
194 mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
195
196 if (o->ssl_sock == NULL) {
197 *errcode = EBADF;
198 return MP_STREAM_ERROR;
199 }
200
201 while (o->bytes_left == 0) {
202 mp_int_t r = ssl_read(o->ssl_sock, &o->buf);
203 if (r == SSL_OK) {
204 // SSL_OK from ssl_read() means "everything is ok, but there's
205 // no user data yet". It may happen e.g. if handshake is not
206 // finished yet. The best way we can treat it is by returning
207 // EAGAIN. This may be a bit unexpected in blocking mode, but
208 // default is to perform complete handshake in constructor, so
209 // this should not happen in blocking mode. On the other hand,
210 // in nonblocking mode EAGAIN (comparing to the alternative of
211 // looping) is really preferrable.
212 if (o->blocking) {
213 continue;
214 } else {
215 goto eagain;
216 }
217 }
218 if (r < 0) {
219 if (r == SSL_CLOSE_NOTIFY || r == SSL_ERROR_CONN_LOST) {
220 // EOF
221 return 0;
222 }
223 if (r == SSL_EAGAIN) {
224 eagain:
225 r = MP_EAGAIN;
226 }
227 *errcode = r;
228 return MP_STREAM_ERROR;
229 }
230 o->bytes_left = r;
231 }
232
233 if (size > o->bytes_left) {
234 size = o->bytes_left;
235 }
236 memcpy(buf, o->buf, size);
237 o->buf += size;
238 o->bytes_left -= size;
239 return size;
240 }
241
ussl_socket_write(mp_obj_t o_in,const void * buf,mp_uint_t size,int * errcode)242 STATIC mp_uint_t ussl_socket_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
243 mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(o_in);
244
245 if (o->ssl_sock == NULL) {
246 *errcode = EBADF;
247 return MP_STREAM_ERROR;
248 }
249
250 mp_int_t r;
251 eagain:
252 r = ssl_write(o->ssl_sock, buf, size);
253 if (r == 0) {
254 // see comment in ussl_socket_read above
255 if (o->blocking) {
256 goto eagain;
257 } else {
258 r = SSL_EAGAIN;
259 }
260 }
261 if (r < 0) {
262 if (r == SSL_CLOSE_NOTIFY || r == SSL_ERROR_CONN_LOST) {
263 return 0; // EOF
264 }
265 if (r == SSL_EAGAIN) {
266 r = MP_EAGAIN;
267 }
268 *errcode = r;
269 return MP_STREAM_ERROR;
270 }
271 return r;
272 }
273
ussl_socket_ioctl(mp_obj_t o_in,mp_uint_t request,uintptr_t arg,int * errcode)274 STATIC mp_uint_t ussl_socket_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
275 mp_obj_ssl_socket_t *self = MP_OBJ_TO_PTR(o_in);
276 if (request == MP_STREAM_CLOSE && self->ssl_sock != NULL) {
277 ssl_free(self->ssl_sock);
278 ssl_ctx_free(self->ssl_ctx);
279 self->ssl_sock = NULL;
280 }
281 // Pass all requests down to the underlying socket
282 return mp_get_stream(self->sock)->ioctl(self->sock, request, arg, errcode);
283 }
284
ussl_socket_setblocking(mp_obj_t self_in,mp_obj_t flag_in)285 STATIC mp_obj_t ussl_socket_setblocking(mp_obj_t self_in, mp_obj_t flag_in) {
286 mp_obj_ssl_socket_t *o = MP_OBJ_TO_PTR(self_in);
287 mp_obj_t sock = o->sock;
288 mp_obj_t dest[3];
289 mp_load_method(sock, MP_QSTR_setblocking, dest);
290 dest[2] = flag_in;
291 mp_obj_t res = mp_call_method_n_kw(1, 0, dest);
292 o->blocking = mp_obj_is_true(flag_in);
293 return res;
294 }
295 STATIC MP_DEFINE_CONST_FUN_OBJ_2(ussl_socket_setblocking_obj, ussl_socket_setblocking);
296
297 STATIC const mp_rom_map_elem_t ussl_socket_locals_dict_table[] = {
298 { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
299 { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
300 { MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
301 { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
302 { MP_ROM_QSTR(MP_QSTR_setblocking), MP_ROM_PTR(&ussl_socket_setblocking_obj) },
303 { MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
304 #if MICROPY_PY_USSL_FINALISER
305 { MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mp_stream_close_obj) },
306 #endif
307 };
308
309 STATIC MP_DEFINE_CONST_DICT(ussl_socket_locals_dict, ussl_socket_locals_dict_table);
310
311 STATIC const mp_stream_p_t ussl_socket_stream_p = {
312 .read = ussl_socket_read,
313 .write = ussl_socket_write,
314 .ioctl = ussl_socket_ioctl,
315 };
316
317 STATIC const mp_obj_type_t ussl_socket_type = {
318 { &mp_type_type },
319 // Save on qstr's, reuse same as for module
320 .name = MP_QSTR_ussl,
321 .print = ussl_socket_print,
322 .getiter = NULL,
323 .iternext = NULL,
324 .protocol = &ussl_socket_stream_p,
325 .locals_dict = (void *)&ussl_socket_locals_dict,
326 };
327
mod_ssl_wrap_socket(size_t n_args,const mp_obj_t * pos_args,mp_map_t * kw_args)328 STATIC mp_obj_t mod_ssl_wrap_socket(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
329 // TODO: Implement more args
330 static const mp_arg_t allowed_args[] = {
331 { MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
332 { MP_QSTR_cert, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
333 { MP_QSTR_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
334 { MP_QSTR_server_hostname, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
335 { MP_QSTR_do_handshake, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = true} },
336 };
337
338 // TODO: Check that sock implements stream protocol
339 mp_obj_t sock = pos_args[0];
340
341 struct ssl_args args;
342 mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args,
343 MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t *)&args);
344
345 return MP_OBJ_FROM_PTR(ussl_socket_new(sock, &args));
346 }
347 STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_ssl_wrap_socket_obj, 1, mod_ssl_wrap_socket);
348
349 STATIC const mp_rom_map_elem_t mp_module_ssl_globals_table[] = {
350 { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ussl) },
351 { MP_ROM_QSTR(MP_QSTR_wrap_socket), MP_ROM_PTR(&mod_ssl_wrap_socket_obj) },
352 };
353
354 STATIC MP_DEFINE_CONST_DICT(mp_module_ssl_globals, mp_module_ssl_globals_table);
355
356 const mp_obj_module_t mp_module_ussl = {
357 .base = { &mp_type_module },
358 .globals = (mp_obj_dict_t *)&mp_module_ssl_globals,
359 };
360
361 #endif // MICROPY_PY_USSL
362