Adds an in-process IRC client (internal/irc) and an `irc@` SSH route that
drops a member straight into the BBS's own Ergo network with no client to
install and no SASL to configure.
- internal/irc/client.go: minimal IRC client (SASL PLAIN, IRCv3 CAP, PING,
PRIVMSG/JOIN/PART/NICK, event stream). Dials Ergo on the loopback
127.0.0.1:6667; presents the member's account name (the SSH key already
proved membership; Ergo's auth-script ignores the passphrase by design).
- internal/irc/tui.go: Bubble Tea TUI over the SSH PTY (mirrors internal/chat)
with /join /part /msg /me /names /nick /help and a current-channel input.
- cmd/agentbbs: handleIRC resolves the member by key (members-only, free) and
runs the client; routed via auth.IsIRCName. AGENTBBS_IRC_ADDR overrides the
target on dev hosts.
- auth: reserve `irc` as a route name.
Unlike copying tor-irc@ (a third-party client in a pod), this runs our own Go
code in-process, so there is no /exec shell-escape surface, and the host
process can reach Ergo's loopback listener directly.
Validated live against a members-only Ergo: non-members are rejected, a member
authenticates via SASL, and channel messages are received.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Provision a self-hosted Ergo IRC network (irc.${DOMAIN}) in setup.sh §9b:
single Go binary on its own ports/user, reusing Caddy's Let's Encrypt cert
for 6697 TLS (refreshed by a timer; self-signed fallback on first boot),
loopback 6667 + a loopback WebSocket fronted by Caddy at wss://${DOMAIN}/irc.
Access is MEMBERS-ONLY: every client must authenticate with SASL, self-service
registration is off, and an auth-script (deploy/ergo/auth-script.sh, installed
as /usr/local/bin/ergo-auth-member) approves a login only if the account name
maps to an existing AgentBBS member home dir under <data>/users/. Passphrase is
ignored — membership (the filesystem dir) is the credential. require-sasl has
no IP exemption so WebSocket clients (which reach Ergo via Caddy from 127.0.0.1)
can't bypass the gate; accounts are auto-created on first successful auth.
Public attack surface is TLS-only (ufw opens 6697; 6667 is loopback). Toggle
with IRC=0. See docs/irc.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
