fab8156b2f
Since all URLContexts have the same AVOptions, such AVOptions will be applied on the outermost context only and removed from the dict, while they probably make sense on all contexts. This makes sure that rw_timeout gets propagated to the innermost URLContext (to make sure it gets passed to the tcp protocol, when opening a http connection for instance). Alternatively, such matching options would be kept in the dict and only removed after the ffurl_connect call. Signed-off-by: Martin Storsjö <martin@martin.st>
337 lines
12 KiB
C
337 lines
12 KiB
C
/*
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* RTMPE network protocol
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* Copyright (c) 2008-2009 Andrej Stepanchuk
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* Copyright (c) 2009-2010 Howard Chu
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* RTMPE protocol
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*/
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#include "libavutil/blowfish.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/rc4.h"
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#include "libavutil/xtea.h"
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#include "internal.h"
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#include "rtmp.h"
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#include "rtmpdh.h"
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#include "rtmpcrypt.h"
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#include "url.h"
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/* protocol handler context */
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typedef struct RTMPEContext {
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const AVClass *class;
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URLContext *stream; ///< TCP stream
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FF_DH *dh; ///< Diffie-Hellman context
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struct AVRC4 key_in; ///< RC4 key used for decrypt data
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struct AVRC4 key_out; ///< RC4 key used for encrypt data
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int handshaked; ///< flag indicating when the handshake is performed
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int tunneling; ///< use a HTTP connection (RTMPTE)
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} RTMPEContext;
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static const uint8_t rtmpe8_keys[16][16] = {
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{ 0xb2, 0x34, 0xf0, 0xbf, 0x1f, 0x08, 0xd9, 0x11,
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0x95, 0xb7, 0xdf, 0xcc, 0x32, 0xe7, 0x8d, 0x74 },
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{ 0xb6, 0x5e, 0x6a, 0x08, 0x0e, 0x09, 0x43, 0x17,
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0xb8, 0x5a, 0xf0, 0x6e, 0xe2, 0x39, 0x5a, 0xfe },
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{ 0x6f, 0x95, 0x10, 0x7b, 0x21, 0x05, 0xce, 0x76,
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0x3a, 0xa7, 0x88, 0x23, 0xa1, 0x49, 0x01, 0x44 },
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{ 0x17, 0xf3, 0x43, 0xa9, 0xb2, 0x1b, 0xf1, 0xeb,
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0xee, 0xa5, 0x91, 0xa6, 0x39, 0x63, 0xf3, 0x17 },
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{ 0x0a, 0xe0, 0x30, 0x7a, 0x2c, 0xe2, 0x29, 0xb5,
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0xa5, 0xae, 0x87, 0xa0, 0xac, 0x79, 0xcb, 0xc0 },
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{ 0x23, 0x0c, 0xce, 0xbd, 0xff, 0xde, 0xeb, 0x2f,
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0x16, 0xae, 0xfa, 0x1c, 0x9d, 0x23, 0x23, 0x11 },
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{ 0x7b, 0x3f, 0xdd, 0x55, 0x2e, 0xe6, 0xe7, 0x77,
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0x99, 0xc4, 0xb8, 0x9b, 0xe4, 0x1e, 0x48, 0xc9 },
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{ 0xb4, 0xb6, 0x7b, 0x40, 0x36, 0x91, 0xe8, 0x71,
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0x55, 0xbf, 0xae, 0xa7, 0x39, 0xb8, 0x33, 0xca },
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{ 0xc3, 0xbd, 0xf6, 0xfc, 0x97, 0x36, 0x3c, 0xb6,
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0x25, 0xf8, 0xe4, 0x7c, 0xb2, 0x59, 0xd9, 0x04 },
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{ 0xfd, 0x91, 0xe0, 0x28, 0x4c, 0x4c, 0x95, 0x41,
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0x00, 0xdb, 0xb7, 0x7f, 0xf8, 0x66, 0xa0, 0xe3 },
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{ 0x76, 0x5b, 0x84, 0x57, 0x03, 0x1b, 0x25, 0x4f,
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0xcd, 0x5b, 0xd4, 0x46, 0x29, 0x0d, 0xc3, 0xa2 },
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{ 0xf8, 0xee, 0xcc, 0x0a, 0x46, 0xb5, 0x55, 0xda,
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0x52, 0x34, 0x47, 0x03, 0x3b, 0x71, 0x63, 0x58 },
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{ 0xdc, 0x75, 0x20, 0xb8, 0xee, 0x1f, 0x5f, 0xa7,
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0xe8, 0x68, 0x42, 0xd8, 0xcc, 0x44, 0x2a, 0xa7 },
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{ 0x9e, 0x6e, 0xcf, 0x07, 0x25, 0x7b, 0x6d, 0xa1,
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0x6c, 0xae, 0xa7, 0x9f, 0x29, 0x56, 0x2f, 0xd9 },
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{ 0xe4, 0xea, 0xb1, 0xfe, 0xe1, 0x3c, 0x8c, 0x8c,
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0xa7, 0x64, 0x00, 0x4e, 0x2a, 0x7c, 0x38, 0x6a },
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{ 0x27, 0x94, 0x3a, 0x89, 0xa2, 0x13, 0x30, 0xcc,
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0x5b, 0x38, 0x06, 0xf1, 0x27, 0xf9, 0x29, 0xa8 }
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};
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static const uint8_t rtmpe9_keys[16][24] = {
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{ 0x79, 0x34, 0x77, 0x4c, 0x67, 0xd1, 0x38, 0x3a, 0xdf, 0xb3, 0x56, 0xbe,
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0x8b, 0x7b, 0xd0, 0x24, 0x38, 0xe0, 0x73, 0x58, 0x41, 0x5d, 0x69, 0x67, },
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{ 0x46, 0xf6, 0xb4, 0xcc, 0x01, 0x93, 0xe3, 0xa1, 0x9e, 0x7d, 0x3c, 0x65,
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0x55, 0x86, 0xfd, 0x09, 0x8f, 0xf7, 0xb3, 0xc4, 0x6f, 0x41, 0xca, 0x5c, },
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{ 0x1a, 0xe7, 0xe2, 0xf3, 0xf9, 0x14, 0x79, 0x94, 0xc0, 0xd3, 0x97, 0x43,
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0x08, 0x7b, 0xb3, 0x84, 0x43, 0x2f, 0x9d, 0x84, 0x3f, 0x21, 0x01, 0x9b, },
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{ 0xd3, 0xe3, 0x54, 0xb0, 0xf7, 0x1d, 0xf6, 0x2b, 0x5a, 0x43, 0x4d, 0x04,
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0x83, 0x64, 0x3e, 0x0d, 0x59, 0x2f, 0x61, 0xcb, 0xb1, 0x6a, 0x59, 0x0d, },
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{ 0xc8, 0xc1, 0xe9, 0xb8, 0x16, 0x56, 0x99, 0x21, 0x7b, 0x5b, 0x36, 0xb7,
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0xb5, 0x9b, 0xdf, 0x06, 0x49, 0x2c, 0x97, 0xf5, 0x95, 0x48, 0x85, 0x7e, },
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{ 0xeb, 0xe5, 0xe6, 0x2e, 0xa4, 0xba, 0xd4, 0x2c, 0xf2, 0x16, 0xe0, 0x8f,
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0x66, 0x23, 0xa9, 0x43, 0x41, 0xce, 0x38, 0x14, 0x84, 0x95, 0x00, 0x53, },
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{ 0x66, 0xdb, 0x90, 0xf0, 0x3b, 0x4f, 0xf5, 0x6f, 0xe4, 0x9c, 0x20, 0x89,
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0x35, 0x5e, 0xd2, 0xb2, 0xc3, 0x9e, 0x9f, 0x7f, 0x63, 0xb2, 0x28, 0x81, },
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{ 0xbb, 0x20, 0xac, 0xed, 0x2a, 0x04, 0x6a, 0x19, 0x94, 0x98, 0x9b, 0xc8,
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0xff, 0xcd, 0x93, 0xef, 0xc6, 0x0d, 0x56, 0xa7, 0xeb, 0x13, 0xd9, 0x30, },
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{ 0xbc, 0xf2, 0x43, 0x82, 0x09, 0x40, 0x8a, 0x87, 0x25, 0x43, 0x6d, 0xe6,
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0xbb, 0xa4, 0xb9, 0x44, 0x58, 0x3f, 0x21, 0x7c, 0x99, 0xbb, 0x3f, 0x24, },
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{ 0xec, 0x1a, 0xaa, 0xcd, 0xce, 0xbd, 0x53, 0x11, 0xd2, 0xfb, 0x83, 0xb6,
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0xc3, 0xba, 0xab, 0x4f, 0x62, 0x79, 0xe8, 0x65, 0xa9, 0x92, 0x28, 0x76, },
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{ 0xc6, 0x0c, 0x30, 0x03, 0x91, 0x18, 0x2d, 0x7b, 0x79, 0xda, 0xe1, 0xd5,
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0x64, 0x77, 0x9a, 0x12, 0xc5, 0xb1, 0xd7, 0x91, 0x4f, 0x96, 0x4c, 0xa3, },
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{ 0xd7, 0x7c, 0x2a, 0xbf, 0xa6, 0xe7, 0x85, 0x7c, 0x45, 0xad, 0xff, 0x12,
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0x94, 0xd8, 0xde, 0xa4, 0x5c, 0x3d, 0x79, 0xa4, 0x44, 0x02, 0x5d, 0x22, },
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{ 0x16, 0x19, 0x0d, 0x81, 0x6a, 0x4c, 0xc7, 0xf8, 0xb8, 0xf9, 0x4e, 0xcd,
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0x2c, 0x9e, 0x90, 0x84, 0xb2, 0x08, 0x25, 0x60, 0xe1, 0x1e, 0xae, 0x18, },
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{ 0xe9, 0x7c, 0x58, 0x26, 0x1b, 0x51, 0x9e, 0x49, 0x82, 0x60, 0x61, 0xfc,
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0xa0, 0xa0, 0x1b, 0xcd, 0xf5, 0x05, 0xd6, 0xa6, 0x6d, 0x07, 0x88, 0xa3, },
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{ 0x2b, 0x97, 0x11, 0x8b, 0xd9, 0x4e, 0xd9, 0xdf, 0x20, 0xe3, 0x9c, 0x10,
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0xe6, 0xa1, 0x35, 0x21, 0x11, 0xf9, 0x13, 0x0d, 0x0b, 0x24, 0x65, 0xb2, },
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{ 0x53, 0x6a, 0x4c, 0x54, 0xac, 0x8b, 0x9b, 0xb8, 0x97, 0x29, 0xfc, 0x60,
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0x2c, 0x5b, 0x3a, 0x85, 0x68, 0xb5, 0xaa, 0x6a, 0x44, 0xcd, 0x3f, 0xa7, },
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};
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int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf)
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{
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RTMPEContext *rt = h->priv_data;
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int offset, ret;
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if (!(rt->dh = ff_dh_init(1024)))
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return AVERROR(ENOMEM);
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offset = ff_rtmp_calc_digest_pos(buf, 768, 632, 8);
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if (offset < 0)
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return offset;
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/* generate a Diffie-Hellmann public key */
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if ((ret = ff_dh_generate_public_key(rt->dh)) < 0)
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return ret;
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/* write the public key into the handshake buffer */
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if ((ret = ff_dh_write_public_key(rt->dh, buf + offset, 128)) < 0)
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return ret;
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return 0;
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}
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int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,
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const uint8_t *clientdata, int type)
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{
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RTMPEContext *rt = h->priv_data;
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uint8_t secret_key[128], digest[32];
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int server_pos, client_pos;
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int ret;
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if (type) {
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if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 1532, 632, 772)) < 0)
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return server_pos;
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} else {
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if ((server_pos = ff_rtmp_calc_digest_pos(serverdata, 768, 632, 8)) < 0)
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return server_pos;
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}
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if ((client_pos = ff_rtmp_calc_digest_pos(clientdata, 768, 632, 8)) < 0)
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return client_pos;
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/* compute the shared secret secret in order to compute RC4 keys */
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if ((ret = ff_dh_compute_shared_secret_key(rt->dh, serverdata + server_pos,
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128, secret_key, sizeof(secret_key))) < 0)
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return ret;
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/* set output key */
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if ((ret = ff_rtmp_calc_digest(serverdata + server_pos, 128, 0, secret_key,
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128, digest)) < 0)
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return ret;
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av_rc4_init(&rt->key_out, digest, 16 * 8, 1);
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/* set input key */
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if ((ret = ff_rtmp_calc_digest(clientdata + client_pos, 128, 0, secret_key,
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128, digest)) < 0)
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return ret;
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av_rc4_init(&rt->key_in, digest, 16 * 8, 1);
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return 0;
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}
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static void rtmpe8_sig(const uint8_t *in, uint8_t *out, int key_id)
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{
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struct AVXTEA ctx;
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av_xtea_le_init(&ctx, rtmpe8_keys[key_id]);
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av_xtea_le_crypt(&ctx, out, in, 1, NULL, 0);
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}
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static void rtmpe9_sig(const uint8_t *in, uint8_t *out, int key_id)
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{
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struct AVBlowfish ctx;
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uint32_t xl, xr;
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xl = AV_RL32(in);
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xr = AV_RL32(in + 4);
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av_blowfish_init(&ctx, rtmpe9_keys[key_id], 24);
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av_blowfish_crypt_ecb(&ctx, &xl, &xr, 0);
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AV_WL32(out, xl);
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AV_WL32(out + 4, xr);
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}
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void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *sig, const uint8_t *digest,
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int type)
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{
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int i;
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for (i = 0; i < 32; i += 8) {
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if (type == 8) {
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/* RTMPE type 8 uses XTEA on the signature */
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rtmpe8_sig(sig + i, sig + i, digest[i] % 15);
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} else if (type == 9) {
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/* RTMPE type 9 uses Blowfish on the signature */
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rtmpe9_sig(sig + i, sig + i, digest[i] % 15);
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}
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}
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}
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int ff_rtmpe_update_keystream(URLContext *h)
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{
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RTMPEContext *rt = h->priv_data;
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char buf[RTMP_HANDSHAKE_PACKET_SIZE];
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/* skip past 1536 bytes of the RC4 bytestream */
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av_rc4_crypt(&rt->key_in, buf, NULL, sizeof(buf), NULL, 1);
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av_rc4_crypt(&rt->key_out, buf, NULL, sizeof(buf), NULL, 1);
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/* the next requests will be encrypted using RC4 keys */
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rt->handshaked = 1;
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return 0;
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}
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static int rtmpe_close(URLContext *h)
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{
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RTMPEContext *rt = h->priv_data;
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ff_dh_free(rt->dh);
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ffurl_close(rt->stream);
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return 0;
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}
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static int rtmpe_open(URLContext *h, const char *uri, int flags)
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{
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RTMPEContext *rt = h->priv_data;
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char host[256], url[1024];
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int ret, port;
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av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
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if (rt->tunneling) {
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if (port < 0)
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port = 80;
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ff_url_join(url, sizeof(url), "ffrtmphttp", NULL, host, port, NULL);
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} else {
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if (port < 0)
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port = 1935;
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ff_url_join(url, sizeof(url), "tcp", NULL, host, port, NULL);
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}
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/* open the tcp or ffrtmphttp connection */
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if ((ret = ffurl_open(&rt->stream, url, AVIO_FLAG_READ_WRITE,
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&h->interrupt_callback, NULL, h->protocols, h)) < 0) {
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rtmpe_close(h);
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return ret;
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}
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return 0;
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}
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static int rtmpe_read(URLContext *h, uint8_t *buf, int size)
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{
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RTMPEContext *rt = h->priv_data;
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int ret;
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rt->stream->flags |= h->flags & AVIO_FLAG_NONBLOCK;
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ret = ffurl_read(rt->stream, buf, size);
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rt->stream->flags &= ~AVIO_FLAG_NONBLOCK;
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if (ret < 0 && ret != AVERROR_EOF)
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return ret;
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if (rt->handshaked && ret > 0) {
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/* decrypt data received by the server */
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av_rc4_crypt(&rt->key_in, buf, buf, ret, NULL, 1);
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}
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return ret;
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}
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static int rtmpe_write(URLContext *h, const uint8_t *buf, int size)
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{
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RTMPEContext *rt = h->priv_data;
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int ret;
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if (rt->handshaked) {
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/* encrypt data to send to the server */
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av_rc4_crypt(&rt->key_out, buf, buf, size, NULL, 1);
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}
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if ((ret = ffurl_write(rt->stream, buf, size)) < 0)
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return ret;
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return size;
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}
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#define OFFSET(x) offsetof(RTMPEContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption ffrtmpcrypt_options[] = {
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{"ffrtmpcrypt_tunneling", "Use a HTTP tunneling connection (RTMPTE).", OFFSET(tunneling), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC},
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{ NULL },
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};
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static const AVClass ffrtmpcrypt_class = {
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.class_name = "ffrtmpcrypt",
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.item_name = av_default_item_name,
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.option = ffrtmpcrypt_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const URLProtocol ff_ffrtmpcrypt_protocol = {
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.name = "ffrtmpcrypt",
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.url_open = rtmpe_open,
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.url_read = rtmpe_read,
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.url_write = rtmpe_write,
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.url_close = rtmpe_close,
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.priv_data_size = sizeof(RTMPEContext),
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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.priv_data_class = &ffrtmpcrypt_class,
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};
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