使用 SSL 連上 Freenode IRC server

ijliao 長輩的 blog 上看到「weechat」這篇才想起來 Freenode 有提供 SSL 連線。

可以在「About freenode: IRC Servers」這頁看到 SSL port 的連線資訊:

All freenode servers listen on ports 6665, 6666, 6667, 6697 (SSL only), 7000 (SSL only), 7070 (SSL only), 8000, 8001 and 8002.

其中 port 6698/7000/7070 是 SSL only,所以就拿這幾個用。由於我是在 Ubuntu 上跑 ppa 版的 WeeChat,所以基本上只加上這三行就可以了:

/set irc.server.freenode.address chat.freenode.net/6697
/set irc.server.freenode.ssl on
/set irc.server.freenode.ssl_dhkey_size 1024

連上後應該會看到類似的訊息:

gnutls: connected using 1024-bit Diffie-Hellman shared secret exchange
gnutls: receiving 2 certificates
 - certificate[1] info:
   - subject `OU=Domain Control Validated,OU=Gandi Standard Wildcard SSL,CN=*.freenode.net', issuer `C=FR,O=GANDI SAS,CN=Gandi Standard SSL CA', RSA key 2048 bits, signed using RSA-SHA1, activated `2014-01-13 00:00:00 UTC', expires `2015-01-14 23:59:59 UTC', SHA-1 fingerprint `2df8bb8922e69f781ef5abcd234fffde0490be21'
 - certificate[2] info:
   - subject `C=FR,O=GANDI SAS,CN=Gandi Standard SSL CA', issuer `C=US,ST=UT,L=Salt Lake City,O=The USERTRUST Network,OU=http://www.usertrust.com,CN=UTN-USERFirst-Hardware', RSA key 2048 bits, signed using RSA-SHA1, activated `2008-10-23 00:00:00 UTC', expires `2020-05-30 10:48:38 UTC', SHA-1 fingerprint `a9f79883a075ce82d20d274d1368e876140d33b3'
gnutls: peer's certificate is trusted

然後在 status line 裡,server[freenode] 的部份變成綠色的。

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