mirror of
https://github.com/matrix-construct/construct
synced 2024-11-14 22:11:06 +01:00
85 lines
3.4 KiB
Text
85 lines
3.4 KiB
Text
|
------------------------------------------------------
|
||
|
|
- Oper Challenge/Response System Documentation -
|
||
|
|
- Copyright (C) 2006 Lee Hardy <lee -at- leeh.co.uk> -
|
||
|
|
- Copyright (C) 2006 ircd-ratbox development team -
|
||
|
|
------------------------------------------------------
|
||
|
|
|
||
|
|
The challenge/response system allows the ability to oper though public key
|
||
|
|
authentication, without the insecurity of oper passwords.
|
||
|
|
|
||
|
|
The challenge system documented here was redesigned in
|
||
|
|
ircd-ratbox-2.2/charybdis-1.1 and is not compatible with earlier versions.
|
||
|
|
|
||
|
|
This document does not describe the technical details of the challenge
|
||
|
|
system. If you are reading this as part of the ircd distribution, the
|
||
|
|
programs referred to are contained in ratbox-respond, see
|
||
|
|
http://respond.ircd-ratbox.org for more information and downloads.
|
||
|
|
|
||
|
|
|
||
|
|
- Challenge basics -
|
||
|
|
--------------------
|
||
|
|
When a user requests a challenge to oper up, the ircd takes some random
|
||
|
|
data, encodes it using the opers public key, encodes this output in base64
|
||
|
|
and sends it to the user as a challenge. The server then stores a hash of
|
||
|
|
the original random data.
|
||
|
|
|
||
|
|
The user must then decrypt the data using their private key and generate a
|
||
|
|
hash of the decrypted data. Then the hash is base64 encoded and sent back
|
||
|
|
to the server.
|
||
|
|
|
||
|
|
If the stored hash the server has matches the reply from the client, they
|
||
|
|
are opered up.
|
||
|
|
|
||
|
|
|
||
|
|
- Generating a public/private keypair -
|
||
|
|
---------------------------------------
|
||
|
|
The first step is to use the makekeypair script to generate a public and
|
||
|
|
private key. The public key is set in the ircd config (operator {};
|
||
|
|
rsa_public_key_file) instead of a password, and the private key should
|
||
|
|
be kept secret. It is highly recommended that the key is generated with
|
||
|
|
a secure password. Generating keys without a password is fundamentally
|
||
|
|
insecure.
|
||
|
|
|
||
|
|
|
||
|
|
The commands used in makekeypair to generate keys are as follows:
|
||
|
|
openssl genrsa -out private.key -aes256 2048
|
||
|
|
openssl rsa -in private.key -out public.key -pubout
|
||
|
|
|
||
|
|
If aes256 is not available, the following is used instead:
|
||
|
|
openssl genrsa -out private.key -des3 2048
|
||
|
|
|
||
|
|
|
||
|
|
- Building ratbox-respond -
|
||
|
|
---------------------------
|
||
|
|
If you are using the unix based ratbox-respond this must be built. For the
|
||
|
|
windows version, ratbox-winrespond, please see http://respond.ircd-ratbox.org
|
||
|
|
|
||
|
|
ratbox-respond takes the challenge from the server, and together with your
|
||
|
|
private key file generates a response to be sent back. ratbox-respond
|
||
|
|
requires the openssl headers (ie, development files) and openssl libraries
|
||
|
|
are installed for compilation.
|
||
|
|
|
||
|
|
Change into the ratbox-respond directory, and run:
|
||
|
|
./configure
|
||
|
|
make
|
||
|
|
|
||
|
|
This will generate a 'ratbox-respond' binary, which you may place wherever
|
||
|
|
you like. If configure does not detect your openssl installation, you may
|
||
|
|
pass it the directory where it is installed to via --enable-openssl, this
|
||
|
|
should be the base directory which has lib/ and include/openssl/ within it:
|
||
|
|
./configure --enable-openssl=/path/to/opensslbase
|
||
|
|
|
||
|
|
|
||
|
|
- Opering up -
|
||
|
|
--------------
|
||
|
|
Once you have your public key set in ircd and built ratbox-respond, you oper
|
||
|
|
up by issuing "/challenge <opername>". You should then run:
|
||
|
|
/path/to/ratbox-respond /path/to/private.key
|
||
|
|
and input the challenge. This will give you a response to paste back to the
|
||
|
|
server. The ratbox-respond binary also accepts piped input, see
|
||
|
|
ratbox-respond/README for more information.
|
||
|
|
|
||
|
|
A number of scripts for clients have already been written to automate this
|
||
|
|
process, see client-scripts/README for more information.
|
||
|
|
|