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Anthony Ettinger
6dc94bd784
Implements M4 (Files). A fully virtual Go SFTP server (pkg/sftp + crypto/ssh,
no OS users) wired as an "sftp" subsystem on the existing :22 wish listener, so
members reach their files with their login key:
sftp files@bbs.profullstack.com # scp/rsync ride the same endpoint
Identity is the SSH key (the username is conventional/ignored). Two areas per
session: a private, quota-limited /me workspace and a single shared public file
area /public (old-school BBS file area; world-read, members-only write by
default, operator-moderated). This reverses the old NG1 "no sharing" boundary in
favour of one sanctioned, inspectable sharing surface (PRD §9.3 amended).
internal/files:
- backend.go service, layout, quota/usage, live-session registry, operator API
- fs.go per-session virtual FS; resolve() is the single security
chokepoint (area confinement + symlink-escape guard) + pkg/sftp
request handlers
- server.go subsystem handler: key auth -> member session -> request server,
with byte metering and force-disconnect
- tui.go in-BBS member browser (hub plugin "Files")
- admin.go operator management TUI: sessions, workspaces/quotas, public area
Operator console: ssh sftp@<host> (allowlist-gated; sftpadmin@/filesadmin@
aliases) — list/disconnect sessions, set per-user quotas, revoke SFTP access,
toggle public write, moderate the public area.
store: files_access (per-user quota override + revoked) and files_settings
(public-write mode) tables + methods. main.go wiring guarded by AGENTBBS_FILES
(+ AGENTBBS_FILES_QUOTA_MB, default 1 GiB). Route names reserved.
Tests (incl -race): path traversal/confinement, symlink-escape rejection,
public-write ACL, quota enforcement, usage accounting, and an end-to-end run
against a real SFTP client. Docs: docs/files.md; PRD §5.3/§5.3.1/§9.3 + README
updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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