Re: [FFmpeg-devel] [PATCH] [RFC] avformat: Add basic same origin check

[Michael Niedermayer <michael@niedermayer.cc>]

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On Wed, May 03, 2023 at 12:05:54PM +0200, Hendrik Leppkes wrote:
> On Tue, May 2, 2023 at 10:57 PM James Almer <jamrial@gmail.com> wrote:
> > >
> > > added
> > > +{"same_none"  , "same origin check off"                       , 0 , AV_OPT_TYPE_CONST, { .i64 = AVFMT_SAME_ORIGIN_CHECK_NONE }, 0, INT_MAX, D|E, "same_origin"},
> >
> > "none" sounds more natural.
> >
> > >
> > >
> > >> And do we want check_path to be default? It's a change
> > >> in behavior.
> > >
> > > is it usefull if its not enabled by default ?
> >
> > It is, since it can be enabled, like the whitelists and blacklists, but
> > the question is if it's preferable to have it enabled. If you consider
> > it so, then it's good and i wont oppose it.
> >
> 
> Is there any estimation how many legitimate streams would be broken by
> these options?
> If any major streams don't work with this, then its not a good option,
> and eg. library users will likely just turn it off or to a lower
> setting, as proper streams just have to work - and log output is
> pretty much useless for API usage cases.
> 
> A quick check for example shows that even something as simple as the
> HLS BBC Radio streams will fail _all_ checks, since the playlists are
> hosted on another host entirely as the media, thanks to akamai live
> streaming.
> Playlist here, as an example:
> http://a.files.bbci.co.uk/media/live/manifesto/audio/simulcast/hls/nonuk/sbr_low/ak/bbc_radio_one.m3u8

yes, thats why it says RFC in the subject, i had expected that a bit already

still OTOH, blocking these by default is the safer option, i mean if a user
does a
./ffplay http://trustedfoobar.org/cutevideo.avi

would she expect that video to access http://127.0.0.1/ and later http://evilhost/localwebscan-success
I think this should not be possible by default settings, its unexpected

maybe a whitelist of hosts or urls. Something the user could add
*.akamaized.net
to may be an option

Thx

[...]
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