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rtpbin: introduce max-streams property

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To be able to cap the number of allowed streams for one session.

This is useful for preventing DoS attacks, where a sender can change
SSRC for every buffer, effectively bringing rtpbin to a halt.

https://bugzilla.gnome.org/show_bug.cgi?id=770292
This commit is contained in:
Havard Graff 2016-05-06 09:44:42 +02:00 committed by Olivier Crête
parent b33470f80c
commit 7ad7266163
2 changed files with 26 additions and 1 deletions
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26
gst/rtpmanager/gstrtpbin.c
View file

@ -299,6 +299,7 @@ enum
#define DEFAULT_MAX_DROPOUT_TIME 60000
#define DEFAULT_MAX_MISORDER_TIME 2000
#define DEFAULT_RFC7273_SYNC FALSE
#define DEFAULT_MAX_STREAMS G_MAXUINT
enum
{
@ -322,7 +323,8 @@ enum
PROP_MAX_RTCP_RTP_TIME_DIFF,
PROP_MAX_DROPOUT_TIME,
PROP_MAX_MISORDER_TIME,
PROP_RFC7273_SYNC
PROP_RFC7273_SYNC,
PROP_MAX_STREAMS
};
#define GST_RTP_BIN_RTCP_SYNC_TYPE (gst_rtp_bin_rtcp_sync_get_type())
@ -1583,6 +1585,9 @@ create_stream (GstRtpBinSession * session, guint32 ssrc)
rtpbin = session->bin;
if (g_slist_length (session->streams) >= rtpbin->max_streams)
goto max_streams;
if (!(buffer = gst_element_factory_make ("rtpjitterbuffer", NULL)))
goto no_jitterbuffer;
@ -1659,6 +1664,12 @@ create_stream (GstRtpBinSession * session, guint32 ssrc)
return stream;
/* ERRORS */
max_streams:
{
GST_WARNING_OBJECT (rtpbin, "stream exeeds maximum (%d)",
rtpbin->max_streams);
return NULL;
}
no_jitterbuffer:
{
g_warning ("rtpbin: could not create rtpjitterbuffer element");
@ -2323,6 +2334,12 @@ gst_rtp_bin_class_init (GstRtpBinClass * klass)
"(requires clock and offset to be provided)", DEFAULT_RFC7273_SYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_STREAMS,
g_param_spec_uint ("max-streams", "Max Streams",
"The maximum number of streams to create for one session",
0, G_MAXUINT, DEFAULT_MAX_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_bin_change_state);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_bin_request_new_pad);
@ -2393,6 +2410,7 @@ gst_rtp_bin_init (GstRtpBin * rtpbin)
rtpbin->max_dropout_time = DEFAULT_MAX_DROPOUT_TIME;
rtpbin->max_misorder_time = DEFAULT_MAX_MISORDER_TIME;
rtpbin->rfc7273_sync = DEFAULT_RFC7273_SYNC;
rtpbin->max_streams = DEFAULT_MAX_STREAMS;
/* some default SDES entries */
cname = g_strdup_printf ("user%u@host-%x", g_random_int (), g_random_int ());
@ -2614,6 +2632,9 @@ gst_rtp_bin_set_property (GObject * object, guint prop_id,
gst_rtp_bin_propagate_property_to_jitterbuffer (rtpbin,
"rfc7273-sync", value);
break;
case PROP_MAX_STREAMS:
rtpbin->max_streams = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -2699,6 +2720,9 @@ gst_rtp_bin_get_property (GObject * object, guint prop_id,
case PROP_RFC7273_SYNC:
g_value_set_boolean (value, rtpbin->rfc7273_sync);
break;
case PROP_MAX_STREAMS:
g_value_set_uint (value, rtpbin->max_streams);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;

1
gst/rtpmanager/gstrtpbin.h
View file

@ -74,6 +74,7 @@ struct _GstRtpBin {
guint32 max_dropout_time;
guint32 max_misorder_time;
gboolean rfc7273_sync;
guint max_streams;
/* a list of session */
GSList *sessions;