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obfs4proxy_manpage.txt
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OBFS4PROXY(1) General Commands Manual OBFS4PROXY(1)
NNAAMMEE
obfs4proxy - pluggable transport proxy for Tor, implementing obfs4
SSYYNNOOPPSSIISS
oobbffss44pprrooxxyy [_o_p_t_i_o_n_s]
DDEESSCCRRIIPPTTIIOONN
obfs4proxy is a tool that attempts to circumvent censorship by
transforming the Tor traffic between the client and the bridge. This
way censors, who usually monitor traffic between the client and the
bridge, will see innocent-looking transformed traffic instead of the
actual Tor traffic.
obfs4proxy implements the obfuscation protocols obfs2, obfs3,
ScrambleSuit (client only), meek (client only) and obfs4.
obfs4proxy is currently only supported as a managed pluggable transport
spawned as a helper process via the ttoorr daemon.
OOPPTTIIOONNSS
--hh, ----hheellpp
Display usage information and exit.
----vveerrssiioonn
Display version information and exit.
----eennaabblleeLLooggggiinngg
Enable logging.
----llooggLLeevveell=_l_e_v_e_l
Specify the maximum log severity to log out of "EERRRROORR", "WWAARRNN",
"IINNFFOO", and "DDEEBBUUGG".
----uunnssaaffeeLLooggggiinngg
Disable the IP address scrubber when logging, storing personally
identifiable information in the logs.
----oobbffss44--ddiissttBBiiaass
When generating probability distributions for the obfs4 length
and timing obfuscation, generate biased distributions similar to
ScrambleSuit.
EENNVVIIOORRNNMMEENNTT
obfs4proxy honors all of the enviornment variables as specified in the
Tor Pluggable Transport Specification.
FFIILLEESS
_D_a_t_a_D_i_r_e_c_t_o_r_y//pptt__ssttaattee//oobbffss44pprrooxxyy..lloogg
The log file, assuming logging is enabled.
_D_a_t_a_D_i_r_e_c_t_o_r_y//pptt__ssttaattee//oobbffss44__ssttaattee..jjssoonn
The Bridge (server) auto-generated obfs4 bridge parameters file.
This file will not be created if the administrator specifies them
in the ttoorrrrcc via a SSeerrvveerrTTrraannssppoorrttOOppttiioonnss directive.
_D_a_t_a_D_i_r_e_c_t_o_r_y//pptt__ssttaattee//oobbffss44__bbrriiddggeelliinnee..ttxxtt
The Bridge (server) obfs4 bridge's client parameters. This file is
created and contains the BBrriiddggee directive a client should add to
their ttoorrrrcc to connect to the running server's obfs4 instance.
CCOONNFFOORRMMIINNGG TTOO
Tor Pluggable Transport Specification
NNOOTTEESS
Using the obfs4 protocol requires tor-0.2.5.x or later.
The obfs2 protocol is included for backwards compatibility purposes
only, and should not be used in new deployments.
EEXXAAMMPPLLEE
To configure tor to be able to use obfs4 bridges (as a client), add
obfs4proxy to the ttoorrrrcc like thus:
# Use obfs4proxy to provide the obfs4 protocol.
ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy
To configure tor to act as an obfs4 bridge (as the server), add
obfs4proxy to the ttoorrrrcc like thus:
#
# In addition to the standard tor bridge configuration, add:
#
# Use obfs4proxy to provide the obfs4 protocol.
ServerTransportPlugin obfs4 exec /usr/bin/obfs4proxy
SSEEEE AALLSSOO
ttoorr ((11)),, ttoorrrrcc ((55)),, oobbffsspprrooxxyy ((11))
2015-10-29 OBFS4PROXY(1)