| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (net_socket.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <net/net_socket_ssl.h> |
| 24 | #include <net/net_socket.h> |
| 25 | #include <encodings/base64.h> |
| 26 | #include <streams/file_stream.h> |
| 27 | #include <string/stdstring.h> |
| 28 | |
| 29 | #include "../../deps/bearssl-0.6/inc/bearssl.h" |
| 30 | |
| 31 | struct ssl_state |
| 32 | { |
| 33 | int fd; |
| 34 | br_ssl_client_context sc; |
| 35 | br_x509_minimal_context xc; |
| 36 | uint8_t iobuf[BR_SSL_BUFSIZE_BIDI]; |
| 37 | }; |
| 38 | |
| 39 | /* TODO/FIXME - static global variables */ |
| 40 | static br_x509_trust_anchor TAs[500] = {}; |
| 41 | static size_t TAs_NUM = 0; |
| 42 | |
| 43 | static uint8_t* current_vdn; |
| 44 | static size_t current_vdn_size; |
| 45 | |
| 46 | static uint8_t* blobdup(const void * src, size_t len) |
| 47 | { |
| 48 | uint8_t * ret = malloc(len); |
| 49 | memcpy(ret, src, len); |
| 50 | return ret; |
| 51 | } |
| 52 | static void vdn_append(void* dest_ctx, const void * src, size_t len) |
| 53 | { |
| 54 | current_vdn = realloc(current_vdn, current_vdn_size + len); |
| 55 | memcpy(current_vdn+current_vdn_size, src, len); |
| 56 | current_vdn_size += len; |
| 57 | } |
| 58 | |
| 59 | static bool append_cert_x509(void* x509, size_t len) |
| 60 | { |
| 61 | br_x509_pkey* pk; |
| 62 | br_x509_decoder_context dc; |
| 63 | br_x509_trust_anchor* ta = &TAs[TAs_NUM]; |
| 64 | |
| 65 | current_vdn = NULL; |
| 66 | current_vdn_size = 0; |
| 67 | |
| 68 | br_x509_decoder_init(&dc, vdn_append, NULL); |
| 69 | br_x509_decoder_push(&dc, x509, len); |
| 70 | pk = br_x509_decoder_get_pkey(&dc); |
| 71 | if (!pk || !br_x509_decoder_isCA(&dc)) |
| 72 | return false; |
| 73 | |
| 74 | ta->dn.len = current_vdn_size; |
| 75 | ta->dn.data = current_vdn; |
| 76 | ta->flags = BR_X509_TA_CA; |
| 77 | |
| 78 | switch (pk->key_type) |
| 79 | { |
| 80 | case BR_KEYTYPE_RSA: |
| 81 | ta->pkey.key_type = BR_KEYTYPE_RSA; |
| 82 | ta->pkey.key.rsa.nlen = pk->key.rsa.nlen; |
| 83 | ta->pkey.key.rsa.n = blobdup(pk->key.rsa.n, pk->key.rsa.nlen); |
| 84 | ta->pkey.key.rsa.elen = pk->key.rsa.elen; |
| 85 | ta->pkey.key.rsa.e = blobdup(pk->key.rsa.e, pk->key.rsa.elen); |
| 86 | break; |
| 87 | case BR_KEYTYPE_EC: |
| 88 | ta->pkey.key_type = BR_KEYTYPE_EC; |
| 89 | ta->pkey.key.ec.curve = pk->key.ec.curve; |
| 90 | ta->pkey.key.ec.qlen = pk->key.ec.qlen; |
| 91 | ta->pkey.key.ec.q = blobdup(pk->key.ec.q, pk->key.ec.qlen); |
| 92 | break; |
| 93 | default: |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | TAs_NUM++; |
| 98 | return true; |
| 99 | } |
| 100 | |
| 101 | static char* delete_linebreaks(char* in) |
| 102 | { |
| 103 | char* iter_in; |
| 104 | char* iter_out; |
| 105 | while (*in == '\n') |
| 106 | in++; |
| 107 | |
| 108 | iter_in = in; |
| 109 | |
| 110 | while (*iter_in != '\n' && *iter_in != '\0') |
| 111 | iter_in++; |
| 112 | iter_out = iter_in; |
| 113 | while (*iter_in != '\0') |
| 114 | { |
| 115 | while (*iter_in == '\n') |
| 116 | iter_in++; |
| 117 | *iter_out++ = *iter_in++; |
| 118 | } |
| 119 | |
| 120 | return in; |
| 121 | } |
| 122 | |
| 123 | /* this rearranges its input, it's easier to implement |
| 124 | * that way and caller doesn't need it anymore anyways */ |
| 125 | static void append_certs_pem_x509(char * certs_pem) |
| 126 | { |
| 127 | void * cert_bin; |
| 128 | int cert_bin_len; |
| 129 | char *cert = certs_pem; |
| 130 | char *cert_end = certs_pem; |
| 131 | |
| 132 | for (;;) |
| 133 | { |
| 134 | cert = strstr(cert_end, "-----BEGIN CERTIFICATE-----"); |
| 135 | if (!cert) |
| 136 | break; |
| 137 | cert += STRLEN_CONST("-----BEGIN CERTIFICATE-----"); |
| 138 | cert_end = strstr(cert, "-----END CERTIFICATE-----"); |
| 139 | |
| 140 | *cert_end = '\0'; |
| 141 | cert = delete_linebreaks(cert); |
| 142 | |
| 143 | cert_bin = unbase64(cert, cert_end-cert, &cert_bin_len); |
| 144 | append_cert_x509(cert_bin, cert_bin_len); |
| 145 | free(cert_bin); |
| 146 | |
| 147 | cert_end++; /* skip the NUL we just added */ |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | /* TODO: not thread safe, rthreads doesn't provide any |
| 152 | * statically allocatable mutex/etc */ |
| 153 | static void initialize(void) |
| 154 | { |
| 155 | void* certs_pem; |
| 156 | if (TAs_NUM) |
| 157 | return; |
| 158 | /* filestream_read_file appends a NUL */ |
| 159 | filestream_read_file("/etc/ssl/certs/ca-certificates.crt", &certs_pem, NULL); |
| 160 | append_certs_pem_x509((char*)certs_pem); |
| 161 | free(certs_pem); |
| 162 | } |
| 163 | |
| 164 | void* ssl_socket_init(int fd, const char *domain) |
| 165 | { |
| 166 | struct ssl_state *state = (struct ssl_state*)calloc(1, sizeof(*state)); |
| 167 | |
| 168 | initialize(); |
| 169 | |
| 170 | br_ssl_client_init_full(&state->sc, &state->xc, TAs, TAs_NUM); |
| 171 | br_ssl_engine_set_buffer(&state->sc.eng, |
| 172 | state->iobuf, sizeof(state->iobuf), true); |
| 173 | br_ssl_client_reset(&state->sc, domain, false); |
| 174 | |
| 175 | state->fd = fd; |
| 176 | return state; |
| 177 | } |
| 178 | |
| 179 | static bool process_inner(struct ssl_state *state, bool blocking) |
| 180 | { |
| 181 | bool dummy; |
| 182 | size_t buflen; |
| 183 | ssize_t bytes; |
| 184 | uint8_t *buf = br_ssl_engine_sendrec_buf(&state->sc.eng, &buflen); |
| 185 | |
| 186 | if (buflen) |
| 187 | { |
| 188 | if (blocking) |
| 189 | bytes = (socket_send_all_blocking(state->fd, buf, buflen, true) |
| 190 | ? buflen |
| 191 | : -1); |
| 192 | else |
| 193 | bytes = socket_send_all_nonblocking(state->fd, buf, buflen, true); |
| 194 | |
| 195 | if (bytes > 0) |
| 196 | br_ssl_engine_sendrec_ack(&state->sc.eng, bytes); |
| 197 | if (bytes < 0) |
| 198 | return false; |
| 199 | /* if we did something, return immediately so we |
| 200 | * don't try to read if Bear still wants to send */ |
| 201 | return true; |
| 202 | } |
| 203 | |
| 204 | buf = br_ssl_engine_recvrec_buf(&state->sc.eng, &buflen); |
| 205 | if (buflen) |
| 206 | { |
| 207 | /* if the socket is blocking, socket_receive_all_nonblocking blocks, |
| 208 | * but only to read at least 1 byte which is exactly what we want */ |
| 209 | bytes = socket_receive_all_nonblocking(state->fd, &dummy, buf, buflen); |
| 210 | if (bytes > 0) |
| 211 | br_ssl_engine_recvrec_ack(&state->sc.eng, bytes); |
| 212 | if (bytes < 0) |
| 213 | return false; |
| 214 | } |
| 215 | |
| 216 | return true; |
| 217 | } |
| 218 | |
| 219 | int ssl_socket_connect(void *state_data, |
| 220 | void *data, bool timeout_enable, bool nonblock) |
| 221 | { |
| 222 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 223 | unsigned bearstate; |
| 224 | |
| 225 | if (timeout_enable) |
| 226 | { |
| 227 | if (!socket_connect_with_timeout(state->fd, data, 5000)) |
| 228 | return -1; |
| 229 | /* socket_connect_with_timeout makes the socket non-blocking. */ |
| 230 | if (!socket_set_block(state->fd, true)) |
| 231 | return -1; |
| 232 | } |
| 233 | else |
| 234 | { |
| 235 | if (socket_connect(state->fd, data)) |
| 236 | return -1; |
| 237 | } |
| 238 | |
| 239 | for (;;) |
| 240 | { |
| 241 | if (!process_inner(state, true)) |
| 242 | return -1; |
| 243 | |
| 244 | bearstate = br_ssl_engine_current_state(&state->sc.eng); |
| 245 | if (bearstate & BR_SSL_SENDAPP) |
| 246 | break; /* handshake done */ |
| 247 | if (bearstate & BR_SSL_CLOSED) |
| 248 | return -1; /* failed */ |
| 249 | } |
| 250 | |
| 251 | return 1; |
| 252 | } |
| 253 | |
| 254 | ssize_t ssl_socket_receive_all_nonblocking(void *state_data, |
| 255 | bool *error, void *data_, size_t size) |
| 256 | { |
| 257 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 258 | uint8_t * bear_data; |
| 259 | size_t bear_data_size; |
| 260 | |
| 261 | socket_set_block(state->fd, false); |
| 262 | |
| 263 | if (!process_inner(state, false)) |
| 264 | { |
| 265 | *error = true; |
| 266 | return -1; |
| 267 | } |
| 268 | |
| 269 | bear_data = br_ssl_engine_recvapp_buf(&state->sc.eng, &bear_data_size); |
| 270 | if (bear_data_size > size) bear_data_size = size; |
| 271 | memcpy(data_, bear_data, bear_data_size); |
| 272 | if (bear_data_size) |
| 273 | br_ssl_engine_recvapp_ack(&state->sc.eng, bear_data_size); |
| 274 | |
| 275 | return bear_data_size; |
| 276 | } |
| 277 | |
| 278 | int ssl_socket_receive_all_blocking(void *state_data, |
| 279 | void *data_, size_t size) |
| 280 | { |
| 281 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 282 | uint8_t *data = (uint8_t*)data_; |
| 283 | uint8_t * bear_data; |
| 284 | size_t bear_data_size; |
| 285 | |
| 286 | socket_set_block(state->fd, true); |
| 287 | |
| 288 | for (;;) |
| 289 | { |
| 290 | bear_data = br_ssl_engine_recvapp_buf(&state->sc.eng, &bear_data_size); |
| 291 | if (bear_data_size > size) |
| 292 | bear_data_size = size; |
| 293 | memcpy(data, bear_data, bear_data_size); |
| 294 | if (bear_data_size) |
| 295 | br_ssl_engine_recvapp_ack(&state->sc.eng, bear_data_size); |
| 296 | data += bear_data_size; |
| 297 | size -= bear_data_size; |
| 298 | |
| 299 | if (size) |
| 300 | process_inner(state, true); |
| 301 | else |
| 302 | break; |
| 303 | } |
| 304 | return 1; |
| 305 | } |
| 306 | |
| 307 | int ssl_socket_send_all_blocking(void *state_data, |
| 308 | const void *data_, size_t size, bool no_signal) |
| 309 | { |
| 310 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 311 | const uint8_t *data = (const uint8_t*)data_; |
| 312 | uint8_t * bear_data; |
| 313 | size_t bear_data_size; |
| 314 | |
| 315 | socket_set_block(state->fd, true); |
| 316 | |
| 317 | for (;;) |
| 318 | { |
| 319 | bear_data = br_ssl_engine_sendapp_buf(&state->sc.eng, &bear_data_size); |
| 320 | if (bear_data_size > size) |
| 321 | bear_data_size = size; |
| 322 | memcpy(bear_data, data_, bear_data_size); |
| 323 | if (bear_data_size) |
| 324 | br_ssl_engine_sendapp_ack(&state->sc.eng, bear_data_size); |
| 325 | data += bear_data_size; |
| 326 | size -= bear_data_size; |
| 327 | |
| 328 | if (size) |
| 329 | process_inner(state, true); |
| 330 | else |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | br_ssl_engine_flush(&state->sc.eng, false); |
| 335 | process_inner(state, false); |
| 336 | return 1; |
| 337 | } |
| 338 | |
| 339 | ssize_t ssl_socket_send_all_nonblocking(void *state_data, |
| 340 | const void *data_, size_t size, bool no_signal) |
| 341 | { |
| 342 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 343 | uint8_t * bear_data; |
| 344 | size_t bear_data_size; |
| 345 | |
| 346 | socket_set_block(state->fd, false); |
| 347 | |
| 348 | bear_data = br_ssl_engine_sendapp_buf(&state->sc.eng, &bear_data_size); |
| 349 | if (bear_data_size > size) |
| 350 | bear_data_size = size; |
| 351 | memcpy(bear_data, data_, bear_data_size); |
| 352 | if (bear_data_size) |
| 353 | { |
| 354 | br_ssl_engine_sendapp_ack(&state->sc.eng, bear_data_size); |
| 355 | br_ssl_engine_flush(&state->sc.eng, false); |
| 356 | } |
| 357 | |
| 358 | if (!process_inner(state, false)) |
| 359 | return -1; |
| 360 | |
| 361 | return bear_data_size; |
| 362 | } |
| 363 | |
| 364 | void ssl_socket_close(void *state_data) |
| 365 | { |
| 366 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 367 | |
| 368 | br_ssl_engine_close(&state->sc.eng); |
| 369 | process_inner(state, false); /* send close notification */ |
| 370 | socket_close(state->fd); /* but immediately close socket |
| 371 | and don't worry about recipient |
| 372 | getting our message */ |
| 373 | } |
| 374 | |
| 375 | void ssl_socket_free(void *state_data) |
| 376 | { |
| 377 | struct ssl_state *state = (struct ssl_state*)state_data; |
| 378 | /* BearSSL does zero allocations of its own, |
| 379 | * so other than this struct, there is nothing to free */ |
| 380 | free(state); |
| 381 | } |