Ubuntu Manpage: etter.conf - Ettercap configuration file

Provided by: ettercap-common_0.8.3.1-13build3_amd64

NAME

       etter.conf - Ettercap configuration file

DESCRIPTION

etter.conf is the configuration file that determines ettercap behaviour. It is always loaded at startup
and it configures some attributes used at runtime.

The file contains entries of the form:

[section]
entry = value
...

Each entry defines a variable that can be customized. Every value MUST be an integer. Sections are used
only to group together some variables.

NOTE: if you omit a variable in the conf file, it will be initialized with the value 0. It is strongly
discouraged to not initialize critical variables such as "arp_poison_delay" or "connection_timeout".

The following is a list of available variables:

[privs]

ec_uid This variable specifies the UID to which privileges are dropped at startup. After the
socket at link layer has been opened the privileges are dropped to a specific uid
different from root for security reasons. etter.conf is the only file that is read
with root privs. Be sure that the specified uid has enough privs to read other files
(etter.*) You can bypass this variable by setting the environment variable EC_UID.

[mitm]

arp_storm_delay The value represents the milliseconds to wait between two consecutive packets during
the initial ARP scan. You can increment this value to be less aggressive at startup.
The randomized scan plus a high delay can fool some types of ARP scan detectors.

arp_poison_smart With this variable set, only 3 initial poisoned ARP messages are sent to the victims.
This poisoned status is kept up by ettercap with responding to ARP requests from
victims that want to refresh their ARP cache. This makes the ARP poisoning very
stealthy but may be unreliable on shared media such as WiFi.

arp_poison_warm_up When the poisoning process starts, the inter-packet delay is low for the first 5
poisons (to be sure the poisoning process has been successful). After the first 5
poisons, the delay is incremented (to keep up the poisoning). This variable controls
the delay for the first 5 poisons. The value is in seconds.
The same delay is used when the victims are restored to the original associations
(RE-ARPing) when ettercap is closed.

arp_poison_delay This variable controls the poisoning delay after the first 5 poisons. The value is
expressed in seconds. You can increase this value (to try to fool the IDS) up to the
timeout of the ARP cache (which depends on the poisoned operating system).

arp_poison_icmp Enable the sending of a spoofed ICMP message to force the targets to make an arp
request. This will create an arp entry in the host cache, so ettercap will be able to
win the race condition and poison the target. Useful against targets that do not
accept gratuitous arp if the entry is not in the cache.

arp_poison_reply Use ARP replies to poison the targets. This is the classic attack.

arp_poison_request Use ARP request to poison the targets. Useful against targets that cache even arp
request values.

arp_poison_equal_mac
Set this option to 0 if you want to skip the poisoning of two hosts with the same mac
address. This may happen if a NIC has one or more aliases on the same network.

dhcp_lease_time This is the lease time (in seconds) for a dhcp assignment. You can lower this value
to permit the victims to receive a correct dhcp reply after you have stopped your
attack. Using higher timeouts can seriously mess up your network after the attack has
finished. On the other hand some clients will prefer a higher lease time, so you have
to increase it to win the race condition against the real server.

port_steal_delay This is the delay time (in milliseconds) between stealing packets for the "port" mitm
method. With low delays you will be able to intercept more packets, but you will
generate more traffic. You have to tune this value in order to find a good balance
between the number of intercepted packets, re-transmitted packets and lost packets.
This value depends on full/half duplex channels, network drivers and adapters,
network general configuration and hardware.

port_steal_send_delay
This is the delay time (in microseconds) between packets when the "port" mitm method
has to re-send packets queues. As said for port_steal_delay you have to tune this
option to the lowest acceptable value.

ndp_poison_warm_up This option operates similar to the arp_poison_warm_up option. When the poisoning
process starts, this option controls the NDP poison delay for the first 5 poisons (to
be sure the poisoning process has been successful). After the first 5 poisons, the
delay is incremented (to keep up the poisoning). This variable controls the delay
for the first 5 poisons. The value should be lower than the ndp_poison_delay. The
value is in seconds.
The same delay is used when the victims are restored to the original associations
when ettercap is closed.

ndp_poison_delay This option is similar to the arp_poison_delay option. It controls the delay in
seconds for sending out the poisoned NDP packets to poison victim's neighbor cache.
This value may be increased to hide from IDSs. But increasing the value increases as
well the probability for failing race conditions during neighbor discovery and to
miss some packets.

ndp_poison_send_delay
This option controls the delay in microseconds between poisoned NDP packets are sent.
This value may be increased to hide from IDSs. But increasing the value increases as
well the probability for failing race conditions during neighbor discovery and to
miss some packets.

ndp_poison_icmp Enable the sending of a spoofed ICMPv6 message to motivate the targets to perform
neighbor discovery. This will create an entry in the host neighbor cache, so ettercap
will be able to win the race condition and poison the target. Useful against targets
that do not accept neighbor advertisements if the entry is not in the cache.

ndp_poison_equal_mac
Set this option to 0 if you want to skip the NDP poisoning of two hosts with the same
mac address. This may happen if a NIC has one or more aliases on the same network.

icmp6_probe_delay This option defines the time in seconds ettercap waits for active IPv6 nodes to
respond to the ICMP probes. Decreasing this value could lead to miss replies from
active IPv6 nodes, hence miss them in the host list. Increasing the value usually has
no impact; normally nodes can manage to answer during the default delay.

NOTE: The ndp and icmp6 options are only available if ettercap has been built with
IPv6 support

[connections]

connection_timeout Every time a new connection is discovered, ettercap allocates the needed structures.
After a customizable timeout, you can free these structures to keep the memory usage
low. This variable represents this timeout. The value is expressed in seconds. This
timeout is applied even to the session tracking system (the protocol state machine
for dissectors).

connection_idle The number of seconds to wait before a connection is marked as IDLE.

connection_buffer This variable controls the size of the buffer linked to each connection. Every
sniffed packet is added to the buffer and when the buffer is full the older packets
are deleted to make room for newer ones. This buffer is useful to view data that went
on the cable before you select and view a specific connection. The higher this value,
the higher the ettercap memory occupation. By the way, the buffer is dynamic, so if
you set a buffer of 100.000 byte it is not allocated all together at the first packet
of a connection, but it is filled as packets arrive.

connect_timeout The timeout in seconds when using the connect() syscall. Increase it if you get a
"Connection timeout" error. This option has nothing to do with connections sniffed by
ettercap. It is a timeout for the connections made by ettercap to other hosts (for
example when fingerprinting remote host).

[stats]

sampling_rate Ettercap keeps some statistics on the processing time of the bottom half (the
sniffer) and top half (the protocol decoder). These statistics are made on the
average processing time of sampling_rate packets. You can decrease this value to have
a more accurate real-time picture of processing time or increase it to have a
smoother picture. The total average will not change, but the worst value will be
heavily influenced by this value.

[misc]

close_on_eof When reading from a dump file and using console or daemon UI, this variable is used
to determine what action has to be done on EOF. It is a boolean value. If set to 1
ettercap will close itself (useful in scripts). Otherwise the session will continue
waiting for user input.

store_profiles Ettercap collects in memory a profile for each host it detects. Users and passwords
are collected there. If you want to run ettercap in background logging all the
traffic, you may want to disable the collecting in memory to save system memory. Set
this option to 0 (zero) to disable profiles collection. A value of 1 will enable
collection for all the hosts, 2 will collect only local hosts and 3 only remote hosts
(a host is considered remote if it does not belong to the netmask).

aggressive_dissectors
Some dissectors (such as SSH and HTTPS) need to modify the payload of the packets in
order to collect passwords and perform a decryption attack. If you want to disable
the "dangerous" dissectors all together, set this value to 0.

skip_forwarded If you set this value to 0 you will sniff even packets forwarded by ettercap or by
the kernel. It will generate duplicate packets in conjunction with the arp mitm
method (for example). It could be useful while running ettercap in unoffensive mode
on a host with more than one network interface (waiting for the multiple-interface
feature...)

checksum_warning If you set the value to 0 the messages about incorrect checksums will not be
displayed in the user messages windows (nor logged to a file with -m).
Note that this option will not disable the check on the packets, but only prevent the
message to be displayed (see below).

checksum_check This option is used to completely disable the check on the checksum of the packets
that ettercap receives. The check on the packets is performed to avoid ettercap
spotting thru bad checsum packets (see Phrack 60.12). If you disable the check, you
will be able to sniff even bad checksummed packet, but you will be spotted if someone
is searching for you...

sniffing_at_startup If this option is set to 1, then ettercap will immediately start unified or bridged
sniffing after the setup phase has been completed. This option helps to avoid traffic
blocking when a MITM technique has been started but forgotten to start sniffing.
Therefore this options is set to 1 by default.
If this behaviour is not desired set it to 0 to manually control the status of
unified or bridged sniffing after ettercap startet. However, sniffing can be stopped
and started at any time while ettercap runs.

geoip_support_enable
This option controls if GeoIP information shall be processed for IP addresses whether
or not ettercap has been built with GeoIP support.

gtkui_prefer_dark_theme
This option tries to enforce the dark variant of the applied theme. However this does
only have an effect if the applied theme provides a dark variant. Normally the
desktop environment controls the theme of applications. But some lightweight desktop
environments doesn't support a configuration option for dark themes even when the
theme provides a dark variant. To leave the theme variant setting to the desktop
environment this option is set to 0 by default.
NOTE: This option is only relevant in GTK mode and if ettercap has been built with
full GTK3 support.

[dissectors]

protocol_name This value represents the port on which the protocol dissector has to be bound. A
value of 0 will disable the dissector. The name of the variable is the same of the
protocol name. You can specify a non standard port for each dissector as well as
multiple ports. The syntax for multiport selection is the following:
port1,port2,port3,...
NOTE: some dissectors are conditionally compiled . This means that depending on the
libraries found in your system some dissectors will be enabled and some others will
not. By default etter.conf contains all supported dissectors. if you got a "FATAL:
Dissector "xxx" does not exists (etter.conf line yy)" error, you have to comment out
the yy line in etter.conf.

[curses]

color You can customize the colors of the curses GUI.
Simply set a field to one of the following values and look at the GUI aspect :)
Here is a list of values: 0 Black, 1 Red, 2 Green, 3 Yellow, 4 Blue, 5 Magenta, 6
Cyan, 7 White

[strings]

utf8_encoding specifies the encoding to be used while displaying the packets in UTF-8 format. Use
the `iconv --list` command for a list of supported encodings.

remote_browser This command is executed by the remote_browser plugin each time it catches a good URL
request into an HTTP connection. The command should be able to get 2 parameters:

%host the Host: tag in the HTTP header. Used to create the full request into the
browser.

%url The page requested inside the GET request.

redir_command_on You must provide a valid command (or script) to enable tcp redirection at the kernel
level in order to be able to use SSL dissection. Your script should be able to get 5
parameters:

%iface The network interface on which the rule must be set

%source
The source IP or network matching the packets to be redirected (default is
0.0.0.0/0, ::/0 resp. or any)

%destination
The destination IP or network matching the packets to be redirected (default
is 0.0.0.0/0, ::/0 resp. or any)

%port The source port of the packets to be redirected (443 for HTTPS, 993 for imaps,
etc).

%rport The internally bound port to which ettercap listens for connections.
NOTE: this script is executed with an execve(), so you cannot use pipes or output redirection as if you
were in a shell. We suggest you to make a script if you need those commands.

NOTE: for this to work, you must set ec_uid to a UID what is privileged to execute the redir_command or
provide a setuid program.

redir_command_off This script is used to remove the redirect rules applied by 'redir_command_on'. You
should note that this script is called atexit() and thus it has not high privileges.
You should provide a setuid program or set ec_uid to 0 in order to be sure that the
script is executed successfully.

ORIGINAL AUTHORS

       Alberto Ornaghi (ALoR) <alor@users.sf.net>
       Marco Valleri (NaGA) <naga@antifork.org>

PROJECT STEWARDS

       Emilio Escobar (exfil)  <eescobar@gmail.com>
       Eric Milam (Brav0Hax)  <jbrav.hax@gmail.com>

OFFICIAL DEVELOPERS

       Mike Ryan (justfalter)  <falter@gmail.com>
       Gianfranco Costamagna (LocutusOfBorg)  <costamagnagianfranco@yahoo.it>
       Antonio Collarino (sniper)  <anto.collarino@gmail.com>
       Ryan Linn   <sussuro@happypacket.net>
       Jacob Baines   <baines.jacob@gmail.com>

CONTRIBUTORS