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mikaela.github.io/pages/external/identifying.html.md
Mikaela Suomalainen 3c1c2a70f0 pages/ext/identifying: add places for client SASL.
2014-06-05 10:41:45 +03:00

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NOTE: This might be heavily freenode-specific, but these things should work with other networks too, at least SASL and CertFP.

I will document the four different methods to identify to services which I use by myself. I use all of these at the same time.

SASL

There isn’t much to say about SASL as it’s easy to configure as long as your IRC client supports it. SASL identifies you before logging in, but it won’t help you in case services are down. The easiest way to check does the network where you are support SASL is probably to whois or message or both to the SaslServ.

/whois SaslServ SaslServ
/msg SaslServ help

If the network does support SASL, you should see something like this which freenode gives:

XX:XX:XX -- [SaslServ] (SaslServ@services.): SASL Authentication Agent
XX:XX:XX -- [SaslServ] services. (Atheme IRC Services)
XX:XX:XX -- [SaslServ] is a Network Service
XX:XX:XX -- [saslserv] End of WHOIS
XX:XX:XX -- SaslServ: This service exists to identify connecting clients to the network. It has no public interface.

There are different mechanisms for use with SASL. I personally use them in this order with ZNC: PLAIN DH-AES DH-BLOWFISH and EXTERNAL.

This is what ZNC 1.5-git-3b01efc says about them:

XX:XX:XX < *sasl> +-------------+----------------------------------------------------+
XX:XX:XX < *sasl> | Mechanism   | Description                                        |
XX:XX:XX < *sasl> +-------------+----------------------------------------------------+
XX:XX:XX < *sasl> | EXTERNAL    | TLS certificate, for use with the *cert module     |
XX:XX:XX < *sasl> | DH-BLOWFISH | Secure negotiation using the DH-BLOWFISH mechanism |
XX:XX:XX < *sasl> | DH-AES      | More secure negotiation using the DH-AES mechanism |
XX:XX:XX < *sasl> | PLAIN       | Plain text negotiation                             |
XX:XX:XX < *sasl> +-------------+----------------------------------------------------+

Some notes:

  • PLAIN is plain text as it says, so if you use it like I do, you should use SSL.
  • EXTERNAL is supposed to be used together with CertFP, but it doesn’t work with most of networks.
    • It’s not supported even by freenode.
    • I don’t know any network that supports it.
  • This won’t help you if services go down.

CertFP

CertFP identifies you using SSL certificate which you must generate and add to your NickServ account.

You can use this command at IRC to check if the network supports certfp.

/msg NickServ help cert

I am not sure how this happens on Windows, so you might need to look for that information elsewhere unless someone decides to help me and tell how does it happen. I am going to tell about OpenSSL.

Generating the certificate

Open terminal and run this command and replae YOURNICKNAMEHERE.pem with your nickname or something else which makes you know what it is (DO NOT SET PASSWORD FOR IT OR YOUR CLIENT MIGHT NOT BE ABLE TO USE IT):

openssl req -nodes -newkey rsa:4096 -keyout YOURNICKNAMEHERE.pem -x509 -days 24855 -out YOURNICKNAMEHERE.pem -subj "/CN=Your Nickname"

This gives us file YOURNICKNAMEHERE.pem which you must give to your IRC client.

NOTE: This certificate is valid for 24855 days which is the maximum on 32-bit systems. This might not be very wise, but as we only use this cert in IRC and we don’t want to worry about regenerating it too often so we have a very long time when it’s valid. You should regenerate your cert as often as you change your password or more even more often…

Oh, and don’t close your terminal yet as you will need it for HexChat.

Telling your client (or bouncer to use the cert).

HexChat

Create a folder “certs” to your HexChat config and copy the .pem file there and copy and rename it as client.pem.

mkdir -p ~/.config/hexchat/certs/
cp YOURNICKNAMEHERE.pem ~/.config/hexchat/certs/client.pem

Now open your HexChat and press CTRL + S or go to HexChat --> Network list and check the settings for the networks that you use.

  • Use SSL for all the servers on this network.
  • Make sure that the login method IS NOT SASL EXTERNAL (cert), as said previously, it won’t work.
    • It appears that HexChat started to want to use it when I added the certificate.
    • If you use something that wants username, uncheck the Use global user informtion or you must specify the username in the Network List and ZNC won’t like it.

Limnoria

Insert your .pem file somewhere where the bot can read it and tell your bot to read use it while connecting with

config networks.<network>.certfile /full/path/to/pem.file

NOTE: This is server specific. ProgVal/Limnoria#612 is feature request for global certfiles.

testing branch

Since Limnoria 2014.06.04 global certificate is supported. You can use the version command to check which version you are using.

config protocols.irc.certfile /full/path/to/pem.file

For instructions to upgrade Limnoria, please see their INSTALL.md file.

WeeChat

I recommend you to /script install iset.pl for easier configuring when you aren’t following this.

Put the .pem file somewhere where your WeeChat can access it, preferably ~/.weechat or whenever your “WeeChat home” is and run the following commands in WeeChat:

/set irc.server_default.ssl_cert %h/YOURNICKNAMEHERE.pem"
/set irc.server_default.ssl on
/set irc.server_default.ssl_dhkey_size 1024
/set irc.server_default.ssl_verify on
  1. Specifies where is the .pem file for all networks that don’t have it invidually specified.
  2. Enables SSL for all networks by default unless otherwise configured.
  3. Sets dhkey_size to 1024 (required by some networks like freenode).
  4. Disables verifying the certificates (required for self-signed certificates and I think that applies to our certificate too).

ZNC

Please read the both parts as you must add the certificate in webadmin or read ZNC documentation on how to add it manually.

Webadmin

First login to your webadmin and if you are admin, go to the global settings. Check the checkbox certauth, scroll down and press “Save”.

Then go to your settings and check the checkbox cert. You might also want to check the checkbox for sasl and perform. Scroll down and click “Save and return”.

Now you should see certauth in global modules where you can specify the fingerprint of the pem file and your IRC client should be able to login to ZNC with it.

You should also see Certificate in user modules. On top of the page it will tell you if you have certificate specified. Open the YOURNICKHERE.pem and copy-paste everything in it to the large box and click Update.

IRC
/znc loadmod --type=global certauth
/znc loadmod --type=user cert
/znc loadmod --type=user perform
/znc loadmod --type=network sasl

This is everything that was done above except adding the certificate which you should do in the webadmin (see the two last paragraphs under webadmin on this page).

Telling NickServ about your key

NickServ wants to know the fingerprint which you can get with the following command:

openssl x509 -sha1 -noout -fingerprint -in YOURNICKNAMEHERE.pem | sed -e 's/^.*=//;s/://g;y/ABCDEF/abcdef/'

which returns your fingerprint (WHICH YOU MUST NOT SHARE WITH ANYONE)

05dd01fedc1b821b796d0d785160f03e32f53fa8

Now you can tell to NickServ about it.

/msg NickServ CERT ADD 05dd01fedc1b821b796d0d785160f03e32f53fa8

(replace that with your own fingerprint!) And nickerv replies to you

14:13:39 -- NickServ: Added fingerprint 05dd01fedc1b821b796d0d785160f03e32f53fa8 to your fingerprint list.

Testing

Now when you connect to freenode and have configured your IRC client to use your new certificate, you should get identified automatically and you should see your certificate by whoising yourself and running cert list with NickServ.

/WHOIS YOURNICK YOURNICK
/MSG NickServ CERT LIST

replies

<...>
XX:XX:XX -- [YOURNICK] has client certificate fingerprint 05dd01fedc1b821b796d0d785160f03e32f53fa8
<...>
XX:XX:XX -- NickServ: Fingerprint list for YOURNICK:
XX:XX:XX -- NickServ: - 05dd01fedc1b821b796d0d785160f03e32f53fa8$$
XX:XX:XX -- NickServ: End of YOURNICK fingerprint list.

Notes

  • You must recreate your certificate as specified by the -days part in the openssl command.
  • This will identify you with immediately so you are still visible to /monitor.
  • This will identify you after services return unlike other methods if you happen to be on splitted server without services.
  • Supported networks which I am on:
    • freenode
    • oftc
    • piratenet

Server password

This might not work with some networks, but this works with freenode. All IRC clients should support settng password which to use while connecting to server. Set it as username:password for freenode and you are automatically identified when you connect.

Some notes:

  • This is only known to work with freenode.
  • You aren’t identified immediately so as shown in the embedded gist, your real host is visible for people who have you on /monitor.
  • This won’t help you if services go down.

Automatic command

This works with probably every client. They support setting commands that are automatically run as you connect and you can set the command

/msg NickServ identify username password

or whatever syntax the services on your network use.

Some notes:

  • Your real host is still visible for /monitor ing people.
  • Your client might send that command too late to prevent you from getting to redirect channels for unidentified users and show your real host to everyone.
  • You might annoy people by joining twice and quitting once with “Changing host”.
For corrections above this line, please contact me at IRC or fix them by yourself here. What is below that line is embedded GitHub gist which reads where to contact with issues with it.
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