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87 lines
3.5 KiB
Text
87 lines
3.5 KiB
Text
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- Oper Challenge/Response System Documentation -
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- Copyright (C) 2006 Lee Hardy <lee -at- leeh.co.uk> -
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- Copyright (C) 2006 ircd-ratbox development team -
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The challenge/response system allows the ability to oper though public key
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authentication, without the insecurity of oper passwords.
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The challenge system documented here was redesigned in
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ircd-ratbox-2.2/charybdis-1.1 and is not compatible with earlier versions.
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This document does not describe the technical details of the challenge
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system. If you are reading this as part of the ircd distribution, the
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programs referred to are contained in ratbox-respond, see
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http://respond.ircd-ratbox.org for more information and downloads.
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- Challenge basics -
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--------------------
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When a user requests a challenge to oper up, the ircd takes some random
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data, encodes it using the opers public key, encodes this output in base64
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and sends it to the user as a challenge. The server then stores a hash of
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the original random data.
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The user must then decrypt the data using their private key and generate a
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hash of the decrypted data. Then the hash is base64 encoded and sent back
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to the server.
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If the stored hash the server has matches the reply from the client, they
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are opered up.
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- Generating a public/private keypair -
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---------------------------------------
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The first step is to use the makekeypair script to generate a public and
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private key. The public key is set in the ircd config (operator {};
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rsa_public_key_file) instead of a password, and the private key should
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be kept secret. It is highly recommended that the key is generated with
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a secure password. Generating keys without a password is fundamentally
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insecure.
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The commands used in makekeypair to generate keys are as follows:
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openssl genrsa -out private.key -aes256 2048
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openssl rsa -in private.key -out public.key -pubout
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If aes256 is not available, the following is used instead:
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openssl genrsa -out private.key -des3 2048
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- Building ratbox-respond -
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---------------------------
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If you are using the unix based ratbox-respond this must be built. For the
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windows version, ratbox-winrespond, please see http://respond.ircd-ratbox.org
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ratbox-respond takes the challenge from the server, and together with your
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private key file generates a response to be sent back. ratbox-respond
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requires the openssl headers (ie, development files) and openssl libraries
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are installed for compilation.
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Change into the ratbox-respond directory, and run:
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./configure
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make
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This will generate a 'ratbox-respond' binary, which you may place wherever
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you like. If configure does not detect your openssl installation, you may
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pass it the directory where it is installed to via --enable-openssl, this
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should be the base directory which has lib/ and include/openssl/ within it:
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./configure --enable-openssl=/path/to/opensslbase
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- Opering up -
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--------------
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Once you have your public key set in ircd and built ratbox-respond, you oper
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up by issuing "/challenge <opername>". You should then run:
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/path/to/ratbox-respond /path/to/private.key
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and input the challenge. This will give you a response to paste back to the
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server. The ratbox-respond binary also accepts piped input, see
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ratbox-respond/README for more information.
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A number of scripts for clients have already been written to automate this
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process, see client-scripts/README for more information.
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--
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$Id: challenge.txt 678 2006-02-03 20:25:01Z jilles $
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