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23e7e3ae JVH |
1 | /** |
2 | * Copyright (C) 2011-2012 Juho Vähä-Herttua | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | */ | |
14 | ||
2340bcd3 JVH |
15 | #include <stdlib.h> |
16 | #include <stdio.h> | |
17 | #include <string.h> | |
18 | #include <assert.h> | |
19 | ||
20 | #include "raop.h" | |
21 | #include "raop_rtp.h" | |
22 | #include "rsakey.h" | |
e4169f77 | 23 | #include "digest.h" |
2340bcd3 JVH |
24 | #include "httpd.h" |
25 | #include "sdp.h" | |
26 | ||
27 | #include "global.h" | |
28 | #include "utils.h" | |
29 | #include "netutils.h" | |
30 | #include "logger.h" | |
31 | ||
32 | /* Actually 345 bytes for 2048-bit key */ | |
33 | #define MAX_SIGNATURE_LEN 512 | |
34 | ||
e4169f77 JVH |
35 | /* Let's just decide on some length */ |
36 | #define MAX_PASSWORD_LEN 64 | |
37 | ||
38 | /* MD5 as hex fits here */ | |
268f72c8 | 39 | #define MAX_NONCE_LEN 32 |
e4169f77 | 40 | |
2340bcd3 JVH |
41 | struct raop_s { |
42 | /* Callbacks for audio */ | |
43 | raop_callbacks_t callbacks; | |
44 | ||
45 | /* Logger instance */ | |
46 | logger_t logger; | |
47 | ||
48 | /* HTTP daemon and RSA key */ | |
49 | httpd_t *httpd; | |
50 | rsakey_t *rsakey; | |
51 | ||
52 | /* Hardware address information */ | |
53 | unsigned char hwaddr[MAX_HWADDR_LEN]; | |
54 | int hwaddrlen; | |
e4169f77 JVH |
55 | |
56 | /* Password information */ | |
57 | char password[MAX_PASSWORD_LEN+1]; | |
2340bcd3 JVH |
58 | }; |
59 | ||
60 | struct raop_conn_s { | |
61 | raop_t *raop; | |
62 | raop_rtp_t *raop_rtp; | |
63 | ||
64 | unsigned char *local; | |
65 | int locallen; | |
66 | ||
67 | unsigned char *remote; | |
68 | int remotelen; | |
e4169f77 JVH |
69 | |
70 | char nonce[MAX_NONCE_LEN+1]; | |
2340bcd3 JVH |
71 | }; |
72 | typedef struct raop_conn_s raop_conn_t; | |
73 | ||
74 | static void * | |
75 | conn_init(void *opaque, unsigned char *local, int locallen, unsigned char *remote, int remotelen) | |
76 | { | |
77 | raop_conn_t *conn; | |
2340bcd3 JVH |
78 | |
79 | conn = calloc(1, sizeof(raop_conn_t)); | |
80 | if (!conn) { | |
81 | return NULL; | |
82 | } | |
83 | conn->raop = opaque; | |
84 | conn->raop_rtp = NULL; | |
85 | ||
c891f978 JVH |
86 | if (locallen == 4) { |
87 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 88 | "Local: %d.%d.%d.%d", |
c891f978 JVH |
89 | local[0], local[1], local[2], local[3]); |
90 | } else if (locallen == 16) { | |
91 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 92 | "Local: %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", |
c891f978 JVH |
93 | local[0], local[1], local[2], local[3], local[4], local[5], local[6], local[7], |
94 | local[8], local[9], local[10], local[11], local[12], local[13], local[14], local[15]); | |
2340bcd3 | 95 | } |
c891f978 JVH |
96 | if (remotelen == 4) { |
97 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 98 | "Remote: %d.%d.%d.%d", |
c891f978 JVH |
99 | remote[0], remote[1], remote[2], remote[3]); |
100 | } else if (remotelen == 16) { | |
101 | logger_log(&conn->raop->logger, LOGGER_INFO, | |
46212791 | 102 | "Remote: %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", |
c891f978 JVH |
103 | remote[0], remote[1], remote[2], remote[3], remote[4], remote[5], remote[6], remote[7], |
104 | remote[8], remote[9], remote[10], remote[11], remote[12], remote[13], remote[14], remote[15]); | |
2340bcd3 | 105 | } |
2340bcd3 JVH |
106 | |
107 | conn->local = malloc(locallen); | |
108 | assert(conn->local); | |
109 | memcpy(conn->local, local, locallen); | |
110 | ||
111 | conn->remote = malloc(remotelen); | |
112 | assert(conn->remote); | |
113 | memcpy(conn->remote, remote, remotelen); | |
114 | ||
115 | conn->locallen = locallen; | |
116 | conn->remotelen = remotelen; | |
e4169f77 JVH |
117 | |
118 | digest_generate_nonce(conn->nonce, sizeof(conn->nonce)); | |
2340bcd3 JVH |
119 | return conn; |
120 | } | |
121 | ||
122 | static void | |
123 | conn_request(void *ptr, http_request_t *request, http_response_t **response) | |
124 | { | |
125 | raop_conn_t *conn = ptr; | |
126 | raop_t *raop = conn->raop; | |
127 | ||
128 | http_response_t *res; | |
129 | const char *method; | |
130 | const char *cseq; | |
131 | const char *challenge; | |
e4169f77 | 132 | int require_auth = 0; |
2340bcd3 JVH |
133 | |
134 | method = http_request_get_method(request); | |
135 | cseq = http_request_get_header(request, "CSeq"); | |
136 | if (!method || !cseq) { | |
137 | return; | |
138 | } | |
139 | ||
140 | res = http_response_init("RTSP/1.0", 200, "OK"); | |
e4169f77 JVH |
141 | if (strlen(raop->password)) { |
142 | const char *authorization; | |
143 | ||
144 | authorization = http_request_get_header(request, "Authorization"); | |
145 | if (authorization) { | |
46212791 JVH |
146 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Our nonce: %s", conn->nonce); |
147 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Authorization: %s", authorization); | |
e4169f77 | 148 | } |
268f72c8 | 149 | if (!digest_is_valid("AppleTV", raop->password, conn->nonce, method, http_request_get_url(request), authorization)) { |
e4169f77 JVH |
150 | char *authstr; |
151 | int authstrlen; | |
152 | ||
153 | /* Allocate the authenticate string */ | |
154 | authstrlen = sizeof("Digest realm=\"AppleTV\", nonce=\"\"") + sizeof(conn->nonce) + 1; | |
155 | authstr = malloc(authstrlen); | |
156 | ||
157 | /* Concatenate the authenticate string */ | |
158 | memset(authstr, 0, authstrlen); | |
159 | strcat(authstr, "Digest realm=\"AppleTV\", nonce=\""); | |
160 | strcat(authstr, conn->nonce); | |
161 | strcat(authstr, "\""); | |
162 | ||
163 | /* Construct a new response */ | |
164 | require_auth = 1; | |
165 | http_response_destroy(res); | |
166 | res = http_response_init("RTSP/1.0", 401, "Unauthorized"); | |
167 | http_response_add_header(res, "WWW-Authenticate", authstr); | |
168 | free(authstr); | |
169 | } else { | |
46212791 | 170 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "AUTHENTICATION SUCCESS!"); |
e4169f77 JVH |
171 | } |
172 | } | |
173 | ||
2340bcd3 JVH |
174 | http_response_add_header(res, "CSeq", cseq); |
175 | http_response_add_header(res, "Apple-Jack-Status", "connected; type=analog"); | |
176 | ||
177 | challenge = http_request_get_header(request, "Apple-Challenge"); | |
91c41e1d | 178 | if (!require_auth && challenge) { |
2340bcd3 JVH |
179 | char signature[MAX_SIGNATURE_LEN]; |
180 | ||
181 | memset(signature, 0, sizeof(signature)); | |
182 | rsakey_sign(raop->rsakey, signature, sizeof(signature), challenge, | |
183 | conn->local, conn->locallen, raop->hwaddr, raop->hwaddrlen); | |
2340bcd3 | 184 | http_response_add_header(res, "Apple-Response", signature); |
c891f978 | 185 | |
46212791 JVH |
186 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got challenge: %s", challenge); |
187 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got response: %s", signature); | |
2340bcd3 | 188 | } |
e4169f77 JVH |
189 | |
190 | if (require_auth) { | |
191 | /* Do nothing in case of authentication request */ | |
192 | } else if (!strcmp(method, "OPTIONS")) { | |
2340bcd3 JVH |
193 | http_response_add_header(res, "Public", "ANNOUNCE, SETUP, RECORD, PAUSE, FLUSH, TEARDOWN, OPTIONS, GET_PARAMETER, SET_PARAMETER"); |
194 | } else if (!strcmp(method, "ANNOUNCE")) { | |
195 | const char *data; | |
196 | int datalen; | |
197 | ||
198 | unsigned char aeskey[16]; | |
199 | unsigned char aesiv[16]; | |
200 | int aeskeylen, aesivlen; | |
201 | ||
202 | data = http_request_get_data(request, &datalen); | |
203 | if (data) { | |
ba0970e1 JVH |
204 | sdp_t *sdp; |
205 | const char *remotestr, *fmtpstr, *aeskeystr, *aesivstr; | |
206 | ||
207 | sdp = sdp_init(data, datalen); | |
208 | remotestr = sdp_get_connection(sdp); | |
209 | fmtpstr = sdp_get_fmtp(sdp); | |
210 | aeskeystr = sdp_get_rsaaeskey(sdp); | |
211 | aesivstr = sdp_get_aesiv(sdp); | |
212 | ||
46212791 JVH |
213 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "connection: %s", remotestr); |
214 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "fmtp: %s", fmtpstr); | |
215 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "rsaaeskey: %s", aeskeystr); | |
216 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aesiv: %s", aesivstr); | |
ba0970e1 JVH |
217 | |
218 | aeskeylen = rsakey_decrypt(raop->rsakey, aeskey, sizeof(aeskey), aeskeystr); | |
219 | aesivlen = rsakey_parseiv(raop->rsakey, aesiv, sizeof(aesiv), aesivstr); | |
46212791 JVH |
220 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aeskeylen: %d", aeskeylen); |
221 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "aesivlen: %d", aesivlen); | |
2340bcd3 | 222 | |
c891f978 JVH |
223 | if (conn->raop_rtp) { |
224 | /* This should never happen */ | |
225 | raop_rtp_destroy(conn->raop_rtp); | |
226 | conn->raop_rtp = NULL; | |
227 | } | |
ba0970e1 | 228 | conn->raop_rtp = raop_rtp_init(&raop->logger, &raop->callbacks, remotestr, fmtpstr, aeskey, aesiv); |
2340bcd3 JVH |
229 | sdp_destroy(sdp); |
230 | } | |
231 | } else if (!strcmp(method, "SETUP")) { | |
ba0970e1 | 232 | unsigned short remote_cport=0, remote_tport=0; |
2340bcd3 JVH |
233 | unsigned short cport=0, tport=0, dport=0; |
234 | const char *transport; | |
235 | char buffer[1024]; | |
236 | int use_udp; | |
237 | ||
238 | transport = http_request_get_header(request, "Transport"); | |
239 | assert(transport); | |
240 | ||
46212791 | 241 | logger_log(&conn->raop->logger, LOGGER_INFO, "Transport: %s", transport); |
2340bcd3 | 242 | use_udp = strncmp(transport, "RTP/AVP/TCP", 11); |
ba0970e1 JVH |
243 | if (use_udp) { |
244 | char *original, *current, *tmpstr; | |
245 | ||
246 | current = original = strdup(transport); | |
247 | if (original) { | |
248 | while ((tmpstr = utils_strsep(¤t, ";")) != NULL) { | |
249 | unsigned short value; | |
250 | int ret; | |
251 | ||
252 | ret = sscanf(tmpstr, "control_port=%hu", &value); | |
253 | if (ret == 1) { | |
46212791 | 254 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Found remote control port: %hu", value); |
ba0970e1 JVH |
255 | remote_cport = value; |
256 | } | |
257 | ret = sscanf(tmpstr, "timing_port=%hu", &value); | |
258 | if (ret == 1) { | |
46212791 | 259 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Found remote timing port: %hu", value); |
ba0970e1 JVH |
260 | remote_tport = value; |
261 | } | |
262 | } | |
263 | } | |
264 | free(original); | |
265 | } | |
266 | raop_rtp_start(conn->raop_rtp, use_udp, remote_cport, remote_tport, &cport, &tport, &dport); | |
2340bcd3 JVH |
267 | |
268 | memset(buffer, 0, sizeof(buffer)); | |
269 | if (use_udp) { | |
270 | snprintf(buffer, sizeof(buffer)-1, | |
ba0970e1 | 271 | "RTP/AVP/UDP;unicast;mode=record;timing_port=%hu;events;control_port=%hu;server_port=%hu", |
2340bcd3 JVH |
272 | tport, cport, dport); |
273 | } else { | |
274 | snprintf(buffer, sizeof(buffer)-1, | |
275 | "RTP/AVP/TCP;unicast;interleaved=0-1;mode=record;server_port=%u", | |
276 | dport); | |
277 | } | |
46212791 | 278 | logger_log(&conn->raop->logger, LOGGER_INFO, "Responding with %s", buffer); |
2340bcd3 JVH |
279 | http_response_add_header(res, "Transport", buffer); |
280 | http_response_add_header(res, "Session", "DEADBEEF"); | |
281 | } else if (!strcmp(method, "SET_PARAMETER")) { | |
282 | const char *data; | |
283 | int datalen; | |
284 | char *datastr; | |
285 | ||
286 | data = http_request_get_data(request, &datalen); | |
287 | datastr = calloc(1, datalen+1); | |
c891f978 | 288 | if (data && datastr && conn->raop_rtp) { |
2340bcd3 JVH |
289 | memcpy(datastr, data, datalen); |
290 | if (!strncmp(datastr, "volume: ", 8)) { | |
291 | float vol = 0.0; | |
d1bbd169 | 292 | sscanf(datastr+8, "%f", &vol); |
2340bcd3 JVH |
293 | raop_rtp_set_volume(conn->raop_rtp, vol); |
294 | } | |
295 | } | |
d1bbd169 | 296 | free(datastr); |
2340bcd3 JVH |
297 | } else if (!strcmp(method, "FLUSH")) { |
298 | const char *rtpinfo; | |
299 | int next_seq = -1; | |
300 | ||
301 | rtpinfo = http_request_get_header(request, "RTP-Info"); | |
c891f978 | 302 | if (rtpinfo) { |
46212791 | 303 | logger_log(&conn->raop->logger, LOGGER_INFO, "Flush with RTP-Info: %s", rtpinfo); |
c891f978 JVH |
304 | if (!strncmp(rtpinfo, "seq=", 4)) { |
305 | next_seq = strtol(rtpinfo+4, NULL, 10); | |
306 | } | |
307 | } | |
308 | if (conn->raop_rtp) { | |
309 | raop_rtp_flush(conn->raop_rtp, next_seq); | |
2340bcd3 | 310 | } |
2340bcd3 JVH |
311 | } else if (!strcmp(method, "TEARDOWN")) { |
312 | http_response_add_header(res, "Connection", "close"); | |
c891f978 JVH |
313 | if (conn->raop_rtp) { |
314 | /* Destroy our RTP session */ | |
315 | raop_rtp_stop(conn->raop_rtp); | |
316 | raop_rtp_destroy(conn->raop_rtp); | |
317 | conn->raop_rtp = NULL; | |
318 | } | |
2340bcd3 JVH |
319 | } |
320 | http_response_finish(res, NULL, 0); | |
321 | ||
46212791 | 322 | logger_log(&conn->raop->logger, LOGGER_DEBUG, "Got request %s with URL %s", method, http_request_get_url(request)); |
2340bcd3 JVH |
323 | *response = res; |
324 | } | |
325 | ||
326 | static void | |
327 | conn_destroy(void *ptr) | |
328 | { | |
329 | raop_conn_t *conn = ptr; | |
330 | ||
331 | if (conn->raop_rtp) { | |
c891f978 | 332 | /* This is done in case TEARDOWN was not called */ |
2340bcd3 JVH |
333 | raop_rtp_destroy(conn->raop_rtp); |
334 | } | |
335 | free(conn->local); | |
336 | free(conn->remote); | |
337 | free(conn); | |
338 | } | |
339 | ||
340 | raop_t * | |
406e9777 | 341 | raop_init(raop_callbacks_t *callbacks, const char *pemkey) |
2340bcd3 JVH |
342 | { |
343 | raop_t *raop; | |
344 | httpd_t *httpd; | |
345 | rsakey_t *rsakey; | |
346 | httpd_callbacks_t httpd_cbs; | |
347 | ||
348 | assert(callbacks); | |
349 | assert(pemkey); | |
2340bcd3 JVH |
350 | |
351 | /* Initialize the network */ | |
352 | if (netutils_init() < 0) { | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | /* Validate the callbacks structure */ | |
357 | if (!callbacks->audio_init || !callbacks->audio_set_volume || | |
358 | !callbacks->audio_process || !callbacks->audio_flush || | |
359 | !callbacks->audio_destroy) { | |
360 | return NULL; | |
361 | } | |
362 | ||
2340bcd3 JVH |
363 | /* Allocate the raop_t structure */ |
364 | raop = calloc(1, sizeof(raop_t)); | |
365 | if (!raop) { | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | /* Initialize the logger */ | |
370 | logger_init(&raop->logger); | |
371 | ||
372 | /* Set HTTP callbacks to our handlers */ | |
373 | memset(&httpd_cbs, 0, sizeof(httpd_cbs)); | |
374 | httpd_cbs.opaque = raop; | |
375 | httpd_cbs.conn_init = &conn_init; | |
376 | httpd_cbs.conn_request = &conn_request; | |
377 | httpd_cbs.conn_destroy = &conn_destroy; | |
378 | ||
379 | /* Initialize the http daemon */ | |
380 | httpd = httpd_init(&raop->logger, &httpd_cbs, 10, 1); | |
381 | if (!httpd) { | |
382 | free(raop); | |
383 | return NULL; | |
384 | } | |
385 | ||
386 | /* Copy callbacks structure */ | |
387 | memcpy(&raop->callbacks, callbacks, sizeof(raop_callbacks_t)); | |
388 | ||
389 | /* Initialize RSA key handler */ | |
390 | rsakey = rsakey_init_pem(pemkey); | |
391 | if (!rsakey) { | |
392 | free(httpd); | |
393 | free(raop); | |
394 | return NULL; | |
395 | } | |
396 | ||
397 | raop->httpd = httpd; | |
398 | raop->rsakey = rsakey; | |
399 | ||
2340bcd3 JVH |
400 | return raop; |
401 | } | |
402 | ||
403 | raop_t * | |
406e9777 | 404 | raop_init_from_keyfile(raop_callbacks_t *callbacks, const char *keyfile) |
2340bcd3 JVH |
405 | { |
406 | raop_t *raop; | |
407 | char *pemstr; | |
408 | ||
409 | if (utils_read_file(&pemstr, keyfile) < 0) { | |
410 | return NULL; | |
411 | } | |
406e9777 | 412 | raop = raop_init(callbacks, pemstr); |
2340bcd3 JVH |
413 | free(pemstr); |
414 | return raop; | |
415 | } | |
416 | ||
417 | void | |
418 | raop_destroy(raop_t *raop) | |
419 | { | |
420 | if (raop) { | |
421 | raop_stop(raop); | |
422 | ||
423 | httpd_destroy(raop->httpd); | |
424 | rsakey_destroy(raop->rsakey); | |
425 | free(raop); | |
426 | ||
427 | /* Cleanup the network */ | |
428 | netutils_cleanup(); | |
429 | } | |
430 | } | |
431 | ||
5a746b97 JVH |
432 | int |
433 | raop_is_running(raop_t *raop) | |
434 | { | |
435 | assert(raop); | |
436 | ||
437 | return httpd_is_running(raop->httpd); | |
438 | } | |
439 | ||
2340bcd3 | 440 | int |
e4169f77 | 441 | raop_start(raop_t *raop, unsigned short *port, const char *hwaddr, int hwaddrlen, const char *password) |
2340bcd3 JVH |
442 | { |
443 | assert(raop); | |
444 | assert(port); | |
406e9777 JVH |
445 | assert(hwaddr); |
446 | ||
447 | /* Validate hardware address */ | |
448 | if (hwaddrlen > MAX_HWADDR_LEN) { | |
449 | return -1; | |
450 | } | |
451 | ||
a68fedbb JVH |
452 | memset(raop->password, 0, sizeof(raop->password)); |
453 | if (password) { | |
454 | /* Validate password */ | |
455 | if (strlen(password) > MAX_PASSWORD_LEN) { | |
456 | return -1; | |
457 | } | |
458 | ||
459 | /* Copy password to the raop structure */ | |
460 | strncpy(raop->password, password, MAX_PASSWORD_LEN); | |
e4169f77 JVH |
461 | } |
462 | ||
406e9777 JVH |
463 | /* Copy hwaddr to the raop structure */ |
464 | memcpy(raop->hwaddr, hwaddr, hwaddrlen); | |
465 | raop->hwaddrlen = hwaddrlen; | |
2340bcd3 JVH |
466 | |
467 | return httpd_start(raop->httpd, port); | |
468 | } | |
469 | ||
470 | void | |
471 | raop_stop(raop_t *raop) | |
472 | { | |
473 | assert(raop); | |
474 | ||
475 | httpd_stop(raop->httpd); | |
476 | } | |
477 |