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Capsicum is a lightweight OS capability and sandbox framework provided
by FreeBSD. When built with Capsicum support - which is the default under
FreeBSD - Irssi can enter a Capsicum capability mode (a sandbox), greatly
limiting possible consequences of a potential security hole in Irssi
or the libraries it depends on.
To make Irssi enter capability mode on startup, add
capsicum = "yes";
to your ~/.irssi/config and restart the client. Alternatively you can
enter it "by hand", using the "/capsicum enter" command. From the security
point of view it's strongly preferable to use the former method, to avoid
establishing connections without the sandbox protection; the "/capsicum"
command is only intended for experimentation, and in cases where you need
to do something that's not possible in capability mode - run scripts,
for example - before continuing.
There is no way to leave the capability mode, apart from exiting Irssi.
When running in capability mode, there are certain restrictions - Irssi
won't be able to access any files outside the directory pointed to by
capsicum_irclogs_path (which defaults to ~/irclogs/). If you change
the path when already in capability mode it won't be effective until
you restart Irssi. Capability mode also makes it impossible to use
the "/save" command.
Currently there is no way to use custom SSL certificates. As a workaround
you can establish connections and enter the capability mode afterwards
using the "/capsicum enter" command.
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