agentbbs/internal/auth/auth.go
Anthony Ettinger 232b8151a2
M2: admin console over ssh admin@ (users, sessions, moderation, plugins) (#3)
A privileged operator console reached as `ssh admin@host`, gated by route
plus the $AGENTBBS_ADMINS allowlist (admin status is operator-granted only,
never self-assigned in-band). It is a self-contained Bubble Tea model, not a
hub plugin, so it never appears in the public menu.

Sections (PRD §6):
  - Users & members: list accounts; b = suspend/ban (operators protected).
    Banned accounts are blocked at the hub and pod@ routes.
  - Sessions & pods: live in-memory session registry; k = disconnect.
  - Moderation & audit: admin action log + agent@ transcripts (tab to switch).
  - Config & plugins: runtime snapshot; space = enable/disable a plugin
    (persisted; filtered from the hub on next sign-in).

Every privileged action is written to a new admin_actions audit table.

store: + banned column, admin_actions and plugin_state tables, and the
backing methods (ListUsers/SetBanned/RecentSessions/LogAdminAction/
RecentAdminActions/RecentChatsAll/DisabledPlugins/SetPluginDisabled), with
unit tests. auth: admin allowlist helpers + tests. Docs in docs/admin.md;
README M2 flipped to done.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-14 02:40:18 -07:00

95 lines
3.3 KiB
Go

// Package auth resolves SSH connections into AgentBBS identities (PRD §4.4).
package auth
import (
"os"
"strings"
"github.com/charmbracelet/ssh"
gossh "golang.org/x/crypto/ssh"
)
// Kind classifies an identity.
type Kind string
const (
Guest Kind = "guest"
Member Kind = "member"
Agent Kind = "agent"
)
// User is the resolved identity for one session.
type User struct {
Name string
Kind Kind
PubKeyFP string // SHA256 fingerprint, empty for guests without a key
StoreID int64 // 0 for guests
}
// GuestNames are usernames that always map to an anonymous guest hub session.
var GuestNames = map[string]bool{"bbs": true, "play": true, "guest": true}
// PodNames are usernames that route to a personal pod instead of the hub.
// Pod access requires an active paid membership (PRD pods addendum).
var PodNames = map[string]bool{"pod": true}
// JoinNames are usernames that trigger the onboarding flow: register the
// visitor's public key, print instructions, and disconnect.
var JoinNames = map[string]bool{"join": true, "signup": true, "register": true}
// DomainNames are usernames that route to the custom-domain self-service flow:
// list/add/remove the domains pointed at a member's homepage.
var DomainNames = map[string]bool{"domain": true, "domains": true}
// AdminNames are usernames that route to the privileged admin console (PRD §6).
// The route only opens for accounts whose name is in the operator allowlist
// (see IsAdmin); the name itself confers nothing.
var AdminNames = map[string]bool{"admin": true, "sysop": true}
// IsGuestName reports whether the SSH username requests anonymous hub access.
func IsGuestName(u string) bool { return GuestNames[strings.ToLower(u)] }
// IsPodName reports whether the SSH username requests the pod route.
func IsPodName(u string) bool { return PodNames[strings.ToLower(u)] }
// IsJoinName reports whether the SSH username requests onboarding.
func IsJoinName(u string) bool { return JoinNames[strings.ToLower(u)] }
// IsDomainName reports whether the SSH username requests the custom-domain flow.
func IsDomainName(u string) bool { return DomainNames[strings.ToLower(u)] }
// IsAdminName reports whether the SSH username requests the admin console.
func IsAdminName(u string) bool { return AdminNames[strings.ToLower(u)] }
// Admins returns the operator-configured admin allowlist: the lowercased,
// comma/space-separated account names in $AGENTBBS_ADMINS. Admin status can
// only be granted by the operator (via env), never self-assigned in-band.
func Admins() map[string]bool {
out := map[string]bool{}
for _, f := range strings.FieldsFunc(os.Getenv("AGENTBBS_ADMINS"), func(r rune) bool {
return r == ',' || r == ' ' || r == '\t' || r == '\n'
}) {
out[strings.ToLower(f)] = true
}
return out
}
// IsAdmin reports whether the account name is in the operator allowlist.
func IsAdmin(name string) bool { return Admins()[strings.ToLower(name)] }
// KindFor infers the identity kind from a (non-guest) username.
// Usernames prefixed "agent-" are automated clients (PRD §3).
func KindFor(username string) Kind {
if strings.HasPrefix(strings.ToLower(username), "agent-") {
return Agent
}
return Member
}
// Fingerprint returns the SHA256 fingerprint for a session public key, or "".
func Fingerprint(key ssh.PublicKey) string {
if key == nil {
return ""
}
return gossh.FingerprintSHA256(key)
}