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This is a meek client only implementation, with the following
differences with dcf's `meek-client`:
- It is named `meek_lite` to differentiate it from the real thing.
- It does not support using an external helper to normalize TLS
signatures, so adversaries can look for someone using the Go
TLS library to do HTTP.
- It does the right thing with TOR_PT_PROXY, even when a helper is
not present.
Most of the credit goes to dcf, who's code I librerally cribbed and
stole. It is intended primarily as a "better than nothina" option
for enviornments that do not or can not presently use an external
Firefox helper.
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Differences from my goptlib branch:
* Instead of exposing a net.Listener, just expose a Handshake() routine
that takes an existing net.Conn. (#14135 is irrelevant to this socks
server.
* There's an extra routine for sending back sensible errors on Dial
failure instead of "General failure".
* The code is slightly cleaner (IMO).
Gotchas:
* If the goptlib pt.Args datatype or external interface changes,
args.go will need to be updated.
Tested with obfs3 and obfs4, including IPv6.
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Implements feature #15576.
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If the relevant enviornment variable is set, treat read errors from
Stdin as a SIGTERM.
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The ideal solution here would be to implement #15435, but till then
use one of several kludges:
* Linux - prctl() so that the kernel SIGTERMs on parent exit.
* Other U*ix - Poll the parent process id once a second, and SIGTERM
ourself/exit if it changes. Former is better since all the normal
cleanup if any gets done.
* Windows - Log a warning.
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The Go developers decided to move the go.net repository to
golang.org/x/net, and also to transition from hg to git. This wasn't
changed when the go.crypto imports were since the 'proxy' component
doesn't have imports that break, so the old code still works.
While the change here is simple (just update the import location), this
affects packagers as it now expects the updated package. Sorry for the
inconveneince, I blame the Go people, and myself for not just doing
this along with the go.crypto changes.
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This allows obfs4proxy to be used as a ScrambleSuit client that is wire
compatible with the obfs4proxy implementation, including session ticket
support, and length obfuscation.
The current implementation has the following limitations:
* IAT obfuscation is not supported (and is disabled in all other
ScrambleSuit implementations by default).
* The length distribution and probabilites are different from those
generated by obfsproxy and obfsclient due to a different DRBG.
* Server support is missing and is unlikely to be implemented.
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The Go developers decided to move the go.crypto repository to
golang.org/x/crypto, and also to transition from hg to git. The tip of
tree code.google.com copy of the code is broken due to the import paths
pointing at the new repository.
While the change here is simple (just update the import location), this
affects packagers as it now expects the updated package. Sorry for the
inconveneince, I blame the Go people.
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Exhaustively testing padding combinations is really slow, and was
causing timeouts during the Debian ARM package build process. Attempt
to improve the situation by:
* Reusing the client and server keypair for all of the tests, to cut
runtime down by ~50%.
* Splitting the client side and server side tests up, as it appears
the timeout is per-test case.
If this doesn't fix things, the next thing to try would be to reduce
the actual number of padding lengths tested, but that is a last resort
at the moment.
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Instead of "node-id" and "public-key" that are Base16 encoded, use
"cert" which contains the "node-id" and "public-key" in Base64 encoded
form. This is more compact and cuts the length down by 49 characters.
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Write an example client bridge line suitable for use with the running
obfs4 server instance to "obfs4_bridgeline.txt" for the convenience of
bridge operators.
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