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rtmp: Add support for SWFVerification

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Specifies how the server verifies client SWF files before allowing the
files to connect to an application. Verifying SWF files is a security
measure that prevents someone from creating their own SWF files that can
attempt to stream your resources.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Samuel Pitoiset 2012-08-13 17:05:00 +02:00 committed by Martin Storsjö
parent 661454aa28
commit 635ac8e1be
3 changed files with 73 additions and 1 deletions
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6
doc/protocols.texi
View File

@ -242,6 +242,12 @@ Name of live stream to subscribe to. By default no value will be sent.
It is only sent if the option is specified or if rtmp_live
is set to live.
@item rtmp_swfhash
SHA256 hash of the decompressed SWF file (32 bytes).
@item rtmp_swfsize
Size of the decompressed SWF file, required for SWFVerification.
@item rtmp_swfurl
URL of the SWF player for the media. By default no value will be sent.

66
libavformat/rtmpproto.c
View File

@ -91,7 +91,11 @@ typedef struct RTMPContext {
int nb_invokes; ///< keeps track of invoke messages
char* tcurl; ///< url of the target stream
char* flashver; ///< version of the flash plugin
char* swfhash; ///< SHA256 hash of the decompressed SWF file (32 bytes)
int swfhash_len; ///< length of the SHA256 hash
int swfsize; ///< size of the decompressed SWF file
char* swfurl; ///< url of the swf player
char swfverification[42]; ///< hash of the SWF verification
char* pageurl; ///< url of the web page
char* subscribe; ///< name of live stream to subscribe
int server_bw; ///< server bandwidth
@ -592,6 +596,27 @@ static int gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
return rtmp_send_packet(rt, &pkt, 0);
}
/**
* Generate SWF verification message and send it to the server.
*/
static int gen_swf_verification(URLContext *s, RTMPContext *rt)
{
RTMPPacket pkt;
uint8_t *p;
int ret;
av_log(s, AV_LOG_DEBUG, "Sending SWF verification...\n");
if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING,
0, 44)) < 0)
return ret;
p = pkt.data;
bytestream_put_be16(&p, 27);
memcpy(p, rt->swfverification, 42);
return rtmp_send_packet(rt, &pkt, 0);
}
/**
* Generate server bandwidth message and send it to the server.
*/
@ -776,6 +801,30 @@ static int rtmp_validate_digest(uint8_t *buf, int off)
return 0;
}
static int rtmp_calc_swf_verification(URLContext *s, RTMPContext *rt,
uint8_t *buf)
{
uint8_t *p;
int ret;
if (rt->swfhash_len != 32) {
av_log(s, AV_LOG_ERROR,
"Hash of the decompressed SWF file is not 32 bytes long.\n");
return AVERROR(EINVAL);
}
p = &rt->swfverification[0];
bytestream_put_byte(&p, 1);
bytestream_put_byte(&p, 1);
bytestream_put_be32(&p, rt->swfsize);
bytestream_put_be32(&p, rt->swfsize);
if ((ret = ff_rtmp_calc_digest(rt->swfhash, 32, 0, buf, 32, p)) < 0)
return ret;
return 0;
}
/**
* Perform handshake with the server by means of exchanging pseudorandom data
* signed with HMAC-SHA2 digest.
@ -866,6 +915,14 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
}
}
/* Generate SWFVerification token (SHA256 HMAC hash of decompressed SWF,
* key are the last 32 bytes of the server handshake. */
if (rt->swfsize) {
if ((ret = rtmp_calc_swf_verification(s, rt, serverdata + 1 +
RTMP_HANDSHAKE_PACKET_SIZE - 32)) < 0)
return ret;
}
ret = ff_rtmp_calc_digest(tosend + 1 + client_pos, 32, 0,
rtmp_server_key, sizeof(rtmp_server_key),
digest);
@ -1001,6 +1058,13 @@ static int handle_ping(URLContext *s, RTMPPacket *pkt)
if (t == 6) {
if ((ret = gen_pong(s, rt, pkt)) < 0)
return ret;
} else if (t == 26) {
if (rt->swfsize) {
if ((ret = gen_swf_verification(s, rt)) < 0)
return ret;
} else {
av_log(s, AV_LOG_WARNING, "Ignoring SWFVerification request.\n");
}
}
return 0;
@ -1717,6 +1781,8 @@ static const AVOption rtmp_options[] = {
{"rtmp_pageurl", "URL of the web page in which the media was embedded. By default no value will be sent.", OFFSET(pageurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
{"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
{"rtmp_subscribe", "Name of live stream to subscribe to. Defaults to rtmp_playpath.", OFFSET(subscribe), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
{"rtmp_swfhash", "SHA256 hash of the decompressed SWF file (32 bytes).", OFFSET(swfhash), AV_OPT_TYPE_BINARY, .flags = DEC},
{"rtmp_swfsize", "Size of the decompressed SWF file, required for SWFVerification.", OFFSET(swfsize), AV_OPT_TYPE_INT, {0}, 0, INT_MAX, DEC},
{"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
{"rtmp_tcurl", "URL of the target stream. Defaults to proto://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
{ NULL },

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 54
#define LIBAVFORMAT_VERSION_MINOR 13
#define LIBAVFORMAT_VERSION_MICRO 2
#define LIBAVFORMAT_VERSION_MICRO 3
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \