Added basic TLS support

[insomniacslk]

Using -key and -cert CLI optins.

Signed-off-by: Andrea Barberio [email protected]

[insomniacslk]

I haven't tested this yet, will do tomorrow

[insomniacslk]

First step to fix #5

[codecov]

Codecov Report

Merging #120 into master will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #120      +/-   ##
=========================================
- Coverage    3.96%   3.90%   -0.06%     
=========================================
  Files           8       8              
  Lines        1034    1049      +15     
=========================================
  Hits           41      41              
- Misses        993    1008      +15     

Impacted Files	Coverage Δ
irc_context.go	0.00% <ø> (ø)
main.go	9.09% <0.00%> (-2.54%)	⬇️
server.go	0.00% <0.00%> (ø)

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[insomniacslk]

Testing

• generated a Letsencrypt certificate generated with certbot
• started the server using -cert and -key on the relevant files
• connected to irc-slack with irssi with TLS enabled

certificate generation

sudo certbot certonly \
    -n \
    -d your.domain.example.com \
    --test-cert \
    --standalone \
    -m [email protected] \
    --agree-tos

server

Need to listen explicitly on a reachable address (I did this test over the internet, so I used 0.0.0.0)

go run . \
    -D \
    -L debug \
    -key /etc/letsencrypt/live/your.domain.example.com/privkey.pem \
    -cert /etc/letsencrypt/live/your.domain.example.com/cert.pem \
    -H 0.0.0.0

irssi

/network add SlackYourTeamName
/server add -tls -auto -network SlackYourTeamName localhost 6666 xoxp-<your-slack-token>
/connect -tls SlackYourTeamName

then received TLS handshake and greeted by irc-slack:

19:42 -!- Irssi: Certificate Chain:
19:42 -!- Irssi:   Subject: CN: your.domain.example.com
19:42 -!- Irssi:   Issuer:  CN: Fake LE Intermediate X1
19:42 -!- Irssi: Protocol: TLSv1.3 (256 bit, TLS_AES_256_GCM_SHA384)
19:42 -!- Irssi: EDH Key: 253 bit Unknown
19:42 -!- Irssi: Public Key: 2048 bit RSA, valid from May  5 17:31:03 2020 GMT to Aug  3 17:31:03 2020 GMT
19:42 -!- Irssi: Public Key Fingerprint:  XX:XX:XX:XX (SHA256)
19:42 -!- Irssi: Certificate Fingerprint: XX:XX:XX:XX (SHA256)
19:42 -!- Irssi: Connection to your.domain.example.com established
19:42 -!- Welcome to the localhost IRC chat, insomniac!
19:42 -!- This is an IRC-to-Slack gateway, written by Andrea Barberio <[email protected]>.
19:42 -!- More information at https://github.com/insomniacslk/irc-slack.

[insomniacslk]

This is ready to review

[insomniacslk]

Updated README with TLS instructions

[insomniacslk]

This has been working consistently for me, I'll merge (but please let me know if it breaks anything for you)