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1 | /* |
2 | * RTMPE network protocol | |
3 | * Copyright (c) 2008-2009 Andrej Stepanchuk | |
4 | * Copyright (c) 2009-2010 Howard Chu | |
5 | * Copyright (c) 2012 Samuel Pitoiset | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | /** | |
25 | * @file | |
26 | * RTMPE protocol | |
27 | */ | |
28 | ||
29 | #include "libavutil/blowfish.h" | |
30 | #include "libavutil/intreadwrite.h" | |
31 | #include "libavutil/opt.h" | |
32 | #include "libavutil/rc4.h" | |
33 | #include "libavutil/xtea.h" | |
34 | ||
35 | #include "internal.h" | |
36 | #include "rtmp.h" | |
37 | #include "rtmpdh.h" | |
38 | #include "rtmpcrypt.h" | |
39 | #include "url.h" | |
40 | ||
41 | /* protocol handler context */ | |
42 | typedef struct RTMPEContext { | |
43 | const AVClass *class; | |
44 | URLContext *stream; ///< TCP stream | |
45 | FF_DH *dh; ///< Diffie-Hellman context | |
46 | struct AVRC4 key_in; ///< RC4 key used for decrypt data | |
47 | struct AVRC4 key_out; ///< RC4 key used for encrypt data | |
48 | int handshaked; ///< flag indicating when the handshake is performed | |
49 | int tunneling; ///< use a HTTP connection (RTMPTE) | |
50 | } RTMPEContext; | |
51 | ||
52 | static const uint8_t rtmpe8_keys[16][16] = { | |
53 | { 0xbf, 0xf0, 0x34, 0xb2, 0x11, 0xd9, 0x08, 0x1f, | |
54 | 0xcc, 0xdf, 0xb7, 0x95, 0x74, 0x8d, 0xe7, 0x32 }, | |
55 | { 0x08, 0x6a, 0x5e, 0xb6, 0x17, 0x43, 0x09, 0x0e, | |
56 | 0x6e, 0xf0, 0x5a, 0xb8, 0xfe, 0x5a, 0x39, 0xe2 }, | |
57 | { 0x7b, 0x10, 0x95, 0x6f, 0x76, 0xce, 0x05, 0x21, | |
58 | 0x23, 0x88, 0xa7, 0x3a, 0x44, 0x01, 0x49, 0xa1 }, | |
59 | { 0xa9, 0x43, 0xf3, 0x17, 0xeb, 0xf1, 0x1b, 0xb2, | |
60 | 0xa6, 0x91, 0xa5, 0xee, 0x17, 0xf3, 0x63, 0x39 }, | |
61 | { 0x7a, 0x30, 0xe0, 0x0a, 0xb5, 0x29, 0xe2, 0x2c, | |
62 | 0xa0, 0x87, 0xae, 0xa5, 0xc0, 0xcb, 0x79, 0xac }, | |
63 | { 0xbd, 0xce, 0x0c, 0x23, 0x2f, 0xeb, 0xde, 0xff, | |
64 | 0x1c, 0xfa, 0xae, 0x16, 0x11, 0x23, 0x23, 0x9d }, | |
65 | { 0x55, 0xdd, 0x3f, 0x7b, 0x77, 0xe7, 0xe6, 0x2e, | |
66 | 0x9b, 0xb8, 0xc4, 0x99, 0xc9, 0x48, 0x1e, 0xe4 }, | |
67 | { 0x40, 0x7b, 0xb6, 0xb4, 0x71, 0xe8, 0x91, 0x36, | |
68 | 0xa7, 0xae, 0xbf, 0x55, 0xca, 0x33, 0xb8, 0x39 }, | |
69 | { 0xfc, 0xf6, 0xbd, 0xc3, 0xb6, 0x3c, 0x36, 0x97, | |
70 | 0x7c, 0xe4, 0xf8, 0x25, 0x04, 0xd9, 0x59, 0xb2 }, | |
71 | { 0x28, 0xe0, 0x91, 0xfd, 0x41, 0x95, 0x4c, 0x4c, | |
72 | 0x7f, 0xb7, 0xdb, 0x00, 0xe3, 0xa0, 0x66, 0xf8 }, | |
73 | { 0x57, 0x84, 0x5b, 0x76, 0x4f, 0x25, 0x1b, 0x03, | |
74 | 0x46, 0xd4, 0x5b, 0xcd, 0xa2, 0xc3, 0x0d, 0x29 }, | |
75 | { 0x0a, 0xcc, 0xee, 0xf8, 0xda, 0x55, 0xb5, 0x46, | |
76 | 0x03, 0x47, 0x34, 0x52, 0x58, 0x63, 0x71, 0x3b }, | |
77 | { 0xb8, 0x20, 0x75, 0xdc, 0xa7, 0x5f, 0x1f, 0xee, | |
78 | 0xd8, 0x42, 0x68, 0xe8, 0xa7, 0x2a, 0x44, 0xcc }, | |
79 | { 0x07, 0xcf, 0x6e, 0x9e, 0xa1, 0x6d, 0x7b, 0x25, | |
80 | 0x9f, 0xa7, 0xae, 0x6c, 0xd9, 0x2f, 0x56, 0x29 }, | |
81 | { 0xfe, 0xb1, 0xea, 0xe4, 0x8c, 0x8c, 0x3c, 0xe1, | |
82 | 0x4e, 0x00, 0x64, 0xa7, 0x6a, 0x38, 0x7c, 0x2a }, | |
83 | { 0x89, 0x3a, 0x94, 0x27, 0xcc, 0x30, 0x13, 0xa2, | |
84 | 0xf1, 0x06, 0x38, 0x5b, 0xa8, 0x29, 0xf9, 0x27 } | |
85 | }; | |
86 | ||
87 | static const uint8_t rtmpe9_keys[16][24] = { | |
88 | { 0x79, 0x34, 0x77, 0x4c, 0x67, 0xd1, 0x38, 0x3a, 0xdf, 0xb3, 0x56, 0xbe, | |
89 | 0x8b, 0x7b, 0xd0, 0x24, 0x38, 0xe0, 0x73, 0x58, 0x41, 0x5d, 0x69, 0x67, }, | |
90 | { 0x46, 0xf6, 0xb4, 0xcc, 0x01, 0x93, 0xe3, 0xa1, 0x9e, 0x7d, 0x3c, 0x65, | |
91 | 0x55, 0x86, 0xfd, 0x09, 0x8f, 0xf7, 0xb3, 0xc4, 0x6f, 0x41, 0xca, 0x5c, }, | |
92 | { 0x1a, 0xe7, 0xe2, 0xf3, 0xf9, 0x14, 0x79, 0x94, 0xc0, 0xd3, 0x97, 0x43, | |
93 | 0x08, 0x7b, 0xb3, 0x84, 0x43, 0x2f, 0x9d, 0x84, 0x3f, 0x21, 0x01, 0x9b, }, | |
94 | { 0xd3, 0xe3, 0x54, 0xb0, 0xf7, 0x1d, 0xf6, 0x2b, 0x5a, 0x43, 0x4d, 0x04, | |
95 | 0x83, 0x64, 0x3e, 0x0d, 0x59, 0x2f, 0x61, 0xcb, 0xb1, 0x6a, 0x59, 0x0d, }, | |
96 | { 0xc8, 0xc1, 0xe9, 0xb8, 0x16, 0x56, 0x99, 0x21, 0x7b, 0x5b, 0x36, 0xb7, | |
97 | 0xb5, 0x9b, 0xdf, 0x06, 0x49, 0x2c, 0x97, 0xf5, 0x95, 0x48, 0x85, 0x7e, }, | |
98 | { 0xeb, 0xe5, 0xe6, 0x2e, 0xa4, 0xba, 0xd4, 0x2c, 0xf2, 0x16, 0xe0, 0x8f, | |
99 | 0x66, 0x23, 0xa9, 0x43, 0x41, 0xce, 0x38, 0x14, 0x84, 0x95, 0x00, 0x53, }, | |
100 | { 0x66, 0xdb, 0x90, 0xf0, 0x3b, 0x4f, 0xf5, 0x6f, 0xe4, 0x9c, 0x20, 0x89, | |
101 | 0x35, 0x5e, 0xd2, 0xb2, 0xc3, 0x9e, 0x9f, 0x7f, 0x63, 0xb2, 0x28, 0x81, }, | |
102 | { 0xbb, 0x20, 0xac, 0xed, 0x2a, 0x04, 0x6a, 0x19, 0x94, 0x98, 0x9b, 0xc8, | |
103 | 0xff, 0xcd, 0x93, 0xef, 0xc6, 0x0d, 0x56, 0xa7, 0xeb, 0x13, 0xd9, 0x30, }, | |
104 | { 0xbc, 0xf2, 0x43, 0x82, 0x09, 0x40, 0x8a, 0x87, 0x25, 0x43, 0x6d, 0xe6, | |
105 | 0xbb, 0xa4, 0xb9, 0x44, 0x58, 0x3f, 0x21, 0x7c, 0x99, 0xbb, 0x3f, 0x24, }, | |
106 | { 0xec, 0x1a, 0xaa, 0xcd, 0xce, 0xbd, 0x53, 0x11, 0xd2, 0xfb, 0x83, 0xb6, | |
107 | 0xc3, 0xba, 0xab, 0x4f, 0x62, 0x79, 0xe8, 0x65, 0xa9, 0x92, 0x28, 0x76, }, | |
108 | { 0xc6, 0x0c, 0x30, 0x03, 0x91, 0x18, 0x2d, 0x7b, 0x79, 0xda, 0xe1, 0xd5, | |
109 | 0x64, 0x77, 0x9a, 0x12, 0xc5, 0xb1, 0xd7, 0x91, 0x4f, 0x96, 0x4c, 0xa3, }, | |
110 | { 0xd7, 0x7c, 0x2a, 0xbf, 0xa6, 0xe7, 0x85, 0x7c, 0x45, 0xad, 0xff, 0x12, | |
111 | 0x94, 0xd8, 0xde, 0xa4, 0x5c, 0x3d, 0x79, 0xa4, 0x44, 0x02, 0x5d, 0x22, }, | |
112 | { 0x16, 0x19, 0x0d, 0x81, 0x6a, 0x4c, 0xc7, 0xf8, 0xb8, 0xf9, 0x4e, 0xcd, | |
113 | 0x2c, 0x9e, 0x90, 0x84, 0xb2, 0x08, 0x25, 0x60, 0xe1, 0x1e, 0xae, 0x18, }, | |
114 | { 0xe9, 0x7c, 0x58, 0x26, 0x1b, 0x51, 0x9e, 0x49, 0x82, 0x60, 0x61, 0xfc, | |
115 | 0xa0, 0xa0, 0x1b, 0xcd, 0xf5, 0x05, 0xd6, 0xa6, 0x6d, 0x07, 0x88, 0xa3, }, | |
116 | { 0x2b, 0x97, 0x11, 0x8b, 0xd9, 0x4e, 0xd9, 0xdf, 0x20, 0xe3, 0x9c, 0x10, | |
117 | 0xe6, 0xa1, 0x35, 0x21, 0x11, 0xf9, 0x13, 0x0d, 0x0b, 0x24, 0x65, 0xb2, }, | |
118 | { 0x53, 0x6a, 0x4c, 0x54, 0xac, 0x8b, 0x9b, 0xb8, 0x97, 0x29, 0xfc, 0x60, | |
119 | 0x2c, 0x5b, 0x3a, 0x85, 0x68, 0xb5, 0xaa, 0x6a, 0x44, 0xcd, 0x3f, 0xa7, }, | |
120 | }; | |
121 | ||
122 | int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf) | |
123 | { | |
124 | RTMPEContext *rt = h->priv_data; | |
125 | int offset, ret; | |
126 | ||
127 | if (!(rt->dh = ff_dh_init(1024))) | |
128 | return AVERROR(ENOMEM); | |
129 | ||
130 | offset = ff_rtmp_calc_digest_pos(buf, 768, 632, 8); | |
131 | if (offset < 0) | |
132 | return offset; | |
133 | ||
134 | /* generate a Diffie-Hellmann public key */ | |
135 | if ((ret = ff_dh_generate_public_key(rt->dh)) < 0) | |
136 | return ret; | |
137 | ||
138 | /* write the public key into the handshake buffer */ | |
139 | if ((ret = ff_dh_write_public_key(rt->dh, buf + offset, 128)) < 0) | |
140 | return ret; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata, | |
146 | const uint8_t *clientdata, int type) | |
147 | { | |
148 | RTMPEContext *rt = h->priv_data; | |
149 | uint8_t secret_key[128], digest[32]; | |
150 | int server_pos, client_pos; | |
151 | int ret; | |
152 | ||
153 | if (type) { | |
154 | if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 1532, 632, 772)) < 0) | |
155 | return server_pos; | |
156 | } else { | |
157 | if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 768, 632, 8)) < 0) | |
158 | return server_pos; | |
159 | } | |
160 | ||
161 | if ((client_pos = ff_rtmp_calc_digest_pos(clientdata, 768, 632, 8)) < 0) | |
162 | return client_pos; | |
163 | ||
164 | /* compute the shared secret secret in order to compute RC4 keys */ | |
165 | if ((ret = ff_dh_compute_shared_secret_key(rt->dh, serverdata + server_pos, | |
166 | 128, secret_key)) < 0) | |
167 | return ret; | |
168 | ||
169 | /* set output key */ | |
170 | if ((ret = ff_rtmp_calc_digest(serverdata + server_pos, 128, 0, secret_key, | |
171 | 128, digest)) < 0) | |
172 | return ret; | |
173 | av_rc4_init(&rt->key_out, digest, 16 * 8, 1); | |
174 | ||
175 | /* set input key */ | |
176 | if ((ret = ff_rtmp_calc_digest(clientdata + client_pos, 128, 0, secret_key, | |
177 | 128, digest)) < 0) | |
178 | return ret; | |
179 | av_rc4_init(&rt->key_in, digest, 16 * 8, 1); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static void rtmpe8_sig(const uint8_t *in, uint8_t *out, int key_id) | |
185 | { | |
186 | struct AVXTEA ctx; | |
187 | ||
188 | av_xtea_init(&ctx, rtmpe8_keys[key_id]); | |
189 | av_xtea_crypt(&ctx, out, in, 1, NULL, 0); | |
190 | } | |
191 | ||
192 | static void rtmpe9_sig(const uint8_t *in, uint8_t *out, int key_id) | |
193 | { | |
194 | struct AVBlowfish ctx; | |
195 | uint32_t xl, xr; | |
196 | ||
197 | xl = AV_RL32(in); | |
198 | xr = AV_RL32(in + 4); | |
199 | ||
200 | av_blowfish_init(&ctx, rtmpe9_keys[key_id], 24); | |
201 | av_blowfish_crypt_ecb(&ctx, &xl, &xr, 0); | |
202 | ||
203 | AV_WL32(out, xl); | |
204 | AV_WL32(out + 4, xr); | |
205 | } | |
206 | ||
207 | void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *sig, const uint8_t *digest, | |
208 | int type) | |
209 | { | |
210 | int i; | |
211 | ||
212 | for (i = 0; i < 32; i += 8) { | |
213 | if (type == 8) { | |
214 | /* RTMPE type 8 uses XTEA on the signature */ | |
215 | rtmpe8_sig(sig + i, sig + i, digest[i] % 15); | |
216 | } else if (type == 9) { | |
217 | /* RTMPE type 9 uses Blowfish on the signature */ | |
218 | rtmpe9_sig(sig + i, sig + i, digest[i] % 15); | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | int ff_rtmpe_update_keystream(URLContext *h) | |
224 | { | |
225 | RTMPEContext *rt = h->priv_data; | |
226 | char buf[RTMP_HANDSHAKE_PACKET_SIZE]; | |
227 | ||
228 | /* skip past 1536 bytes of the RC4 bytestream */ | |
229 | av_rc4_crypt(&rt->key_in, buf, NULL, sizeof(buf), NULL, 1); | |
230 | av_rc4_crypt(&rt->key_out, buf, NULL, sizeof(buf), NULL, 1); | |
231 | ||
232 | /* the next requests will be encrypted using RC4 keys */ | |
233 | rt->handshaked = 1; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int rtmpe_close(URLContext *h) | |
239 | { | |
240 | RTMPEContext *rt = h->priv_data; | |
241 | ||
242 | ff_dh_free(rt->dh); | |
243 | ffurl_close(rt->stream); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static int rtmpe_open(URLContext *h, const char *uri, int flags) | |
249 | { | |
250 | RTMPEContext *rt = h->priv_data; | |
251 | char host[256], url[1024]; | |
252 | int ret, port; | |
253 | ||
254 | av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri); | |
255 | ||
256 | if (rt->tunneling) { | |
257 | if (port < 0) | |
258 | port = 80; | |
259 | ff_url_join(url, sizeof(url), "ffrtmphttp", NULL, host, port, NULL); | |
260 | } else { | |
261 | if (port < 0) | |
262 | port = 1935; | |
263 | ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL); | |
264 | } | |
265 | ||
266 | /* open the tcp or ffrtmphttp connection */ | |
267 | if ((ret = ffurl_open(&rt->stream, url, AVIO_FLAG_READ_WRITE, | |
268 | &h->interrupt_callback, NULL)) < 0) { | |
269 | rtmpe_close(h); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int rtmpe_read(URLContext *h, uint8_t *buf, int size) | |
277 | { | |
278 | RTMPEContext *rt = h->priv_data; | |
279 | int ret; | |
280 | ||
281 | rt->stream->flags |= h->flags & AVIO_FLAG_NONBLOCK; | |
282 | ret = ffurl_read(rt->stream, buf, size); | |
283 | rt->stream->flags &= ~AVIO_FLAG_NONBLOCK; | |
284 | ||
285 | if (ret < 0 && ret != AVERROR_EOF) | |
286 | return ret; | |
287 | ||
288 | if (rt->handshaked && ret > 0) { | |
289 | /* decrypt data received by the server */ | |
290 | av_rc4_crypt(&rt->key_in, buf, buf, ret, NULL, 1); | |
291 | } | |
292 | ||
293 | return ret; | |
294 | } | |
295 | ||
296 | static int rtmpe_write(URLContext *h, const uint8_t *buf, int size) | |
297 | { | |
298 | RTMPEContext *rt = h->priv_data; | |
299 | int ret; | |
300 | ||
301 | if (rt->handshaked) { | |
302 | /* encrypt data to send to the server */ | |
303 | av_rc4_crypt(&rt->key_out, buf, buf, size, NULL, 1); | |
304 | } | |
305 | ||
306 | if ((ret = ffurl_write(rt->stream, buf, size)) < 0) | |
307 | return ret; | |
308 | ||
309 | return size; | |
310 | } | |
311 | ||
312 | #define OFFSET(x) offsetof(RTMPEContext, x) | |
313 | #define DEC AV_OPT_FLAG_DECODING_PARAM | |
314 | ||
315 | static const AVOption ffrtmpcrypt_options[] = { | |
316 | {"ffrtmpcrypt_tunneling", "Use a HTTP tunneling connection (RTMPTE).", OFFSET(tunneling), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC}, | |
317 | { NULL }, | |
318 | }; | |
319 | ||
320 | static const AVClass ffrtmpcrypt_class = { | |
321 | .class_name = "ffrtmpcrypt", | |
322 | .item_name = av_default_item_name, | |
323 | .option = ffrtmpcrypt_options, | |
324 | .version = LIBAVUTIL_VERSION_INT, | |
325 | }; | |
326 | ||
327 | URLProtocol ff_ffrtmpcrypt_protocol = { | |
328 | .name = "ffrtmpcrypt", | |
329 | .url_open = rtmpe_open, | |
330 | .url_read = rtmpe_read, | |
331 | .url_write = rtmpe_write, | |
332 | .url_close = rtmpe_close, | |
333 | .priv_data_size = sizeof(RTMPEContext), | |
334 | .flags = URL_PROTOCOL_FLAG_NETWORK, | |
335 | .priv_data_class = &ffrtmpcrypt_class, | |
336 | }; |