feat(peers): full trust-store UI — accept, reject, revoke, re-authorize

- /api/peers/reject forwards to the auth service's new /internal/reject
  (pending request denied + audited; peer stays on the no-op path).
- TrustedServices panel now has three sections: Requested (Accept/Reject),
  Accepted (Revoke), and Revoked (Re-authorize), with timestamps.
- The old pending 'Ignore' button mapped to revoke, which was the wrong
  operation for a never-approved request.

spec.yaml

@@ -546,3 +546,26 @@ paths:
           description: Missing service or fingerprint
         '502':
           description: Failed to reach the shared auth service
+
+  /api/peers/reject:
+    post:
+      summary: Reject a pending peer authorization request
+      tags: ["security"]
+      description: >
+        Denies a first-contact authorization request without authorizing it.
+        The auth service drops the request from the pending list and audits
+        the decision; the peer stays on the no-op path (a later contact simply
+        re-records a fresh pending request).
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/PeerAction'
+      responses:
+        '200':
+          description: Pending request rejected
+        '400':
+          description: Missing service or fingerprint
+        '502':
+          description: Failed to reach the shared auth service

src/frontend/src/components/service/trusted-services.tsx

@@ -16,11 +16,11 @@
  */
 
 import { useEffect, useState } from 'preact/hooks'
-import { BadgeCheck, Check, LoaderCircle, ShieldCheck, X } from 'lucide-react'
+import { BadgeCheck, Check, LoaderCircle, RotateCcw, ShieldCheck, X } from 'lucide-react'
 import { Button } from '@components/ui/button'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@components/ui/card'
 import { toast } from 'sonner'
-import { approvePeer, fetchTrustState, revokePeer } from '@lib/api/peers'
+import { approvePeer, fetchTrustState, rejectPeer, revokePeer } from '@lib/api/peers'
 import { useAsyncAction } from '@lib/hooks/useAsyncAction'
 import { cn } from '@lib/utils'
 import type { PeerAuthorized, PeerPending, PeerTrustState } from '@lib/types'
@@ -39,11 +39,19 @@ function shortFingerprint(fp: string): string {
   return `${fp.slice(0, 16)}…`
 }
 
+function fmtTime(iso?: string | null): string {
+  if (!iso) return ''
+  const d = new Date(iso)
+  if (Number.isNaN(d.getTime())) return iso
+  return d.toLocaleString()
+}
+
 /**
  * The trusted-services surface (security theme M2 §3): pending first-contact
- * authorizations and the approved trust store. Maestro is only the UI — the
- * auth service owns the enforcement, so this panel is a convenience, not a
- * security boundary. Hidden entirely when the management API is unreachable.
+ * authorizations, the approved trust store, and revoked keys. Maestro is only
+ * the UI — the auth service owns the enforcement, so this panel is a
+ * convenience, not a security boundary. Hidden entirely when the management
+ * API is unreachable.
  */
 export function TrustedServices() {
   const [state, setState] = useState<LoadState>({ kind: 'loading' })
@@ -63,10 +71,13 @@ export function TrustedServices() {
 
   if (state.kind === 'loading') return null
   if (state.kind === 'error') return null
-  if (state.state.pending.length === 0 && state.state.authorized.length === 0) return null
 
-  const pending = state.state.pending
-  const authorized = state.state.authorized.filter((k) => !k.revoked_at)
+  const pending = state.state.pending ?? []
+  const authorized = state.state.authorized ?? []
+  const active = authorized.filter((k) => !k.revoked_at)
+  const revoked = authorized.filter((k) => k.revoked_at)
+
+  if (pending.length === 0 && active.length === 0 && revoked.length === 0) return null
 
   return (
     <Card data-slot="trusted-services">
@@ -76,26 +87,44 @@ export function TrustedServices() {
           Trusted services
         </CardTitle>
         <CardDescription>
-          Services asking to talk to the auth service. Approve a fingerprint to authorize it (SSH
-          authorized_keys, applied to the service fleet); revoke cuts it off immediately.
+          Services asking to talk to the auth service. Accept authorizes a fingerprint (SSH
+          authorized_keys, applied to the service fleet), reject drops a request without
+          authorizing it, revoke cuts off an accepted peer immediately, re-authorize restores one.
         </CardDescription>
       </CardHeader>
 
       {pending.length > 0 && (
         <CardContent data-slot="trusted-pending" className="grid gap-2">
+          <p className="text-xs font-medium uppercase tracking-wide text-amber-600">
+            Requested access ({pending.length})
+          </p>
           {pending.map((p) => (
             <PendingRow key={`${p.service}:${p.fingerprint}`} entry={p} onDone={load} />
           ))}
         </CardContent>
       )}
 
-      {authorized.length > 0 && (
+      {active.length > 0 && (
         <CardContent data-slot="trusted-approved" className="grid gap-2">
-          {authorized.map((k) => (
+          <p className="text-xs font-medium uppercase tracking-wide text-emerald-600">
+            Accepted ({active.length})
+          </p>
+          {active.map((k) => (
             <AuthorizedRow key={`${k.service}:${k.fingerprint}`} entry={k} onDone={load} />
           ))}
         </CardContent>
       )}
+
+      {revoked.length > 0 && (
+        <CardContent data-slot="trusted-revoked" className="grid gap-2">
+          <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
+            Revoked ({revoked.length})
+          </p>
+          {revoked.map((k) => (
+            <RevokedRow key={`${k.service}:${k.fingerprint}`} entry={k} onDone={load} />
+          ))}
+        </CardContent>
+      )}
     </Card>
   )
 }
@@ -111,13 +140,13 @@ function PendingRow({ entry, onDone }: { entry: PeerPending; onDone: () => void
     }
   })
 
-  const deny = useAsyncAction(async () => {
+  const reject = useAsyncAction(async () => {
     try {
-      await revokePeer(entry.service, entry.fingerprint)
-      toast.success(`Ignored ${entry.service}`, { description: shortFingerprint(entry.fingerprint) })
+      await rejectPeer(entry.service, entry.fingerprint)
+      toast.success(`Rejected ${entry.service}`, { description: shortFingerprint(entry.fingerprint) })
       onDone()
     } catch (error) {
-      toast.error(`Failed to ignore ${entry.service}`, { description: errorMessage(error) })
+      toast.error(`Failed to reject ${entry.service}`, { description: errorMessage(error) })
     }
   })
 
@@ -129,15 +158,16 @@ function PendingRow({ entry, onDone }: { entry: PeerPending; onDone: () => void
           {entry.service}
         </p>
         <p className="truncate font-mono text-xs text-muted-foreground">{entry.fingerprint}</p>
+        <p className="text-xs text-muted-foreground/70">First seen {fmtTime(entry.first_seen)}</p>
       </div>
       <div className="flex shrink-0 items-center gap-2">
-        <Button size="xs" variant="outline" onPress={() => void deny.run()} isDisabled={deny.pending}>
-          {deny.pending ? <LoaderCircle className="animate-spin" /> : <X />}
-          Ignore
+        <Button size="xs" variant="outline" onPress={() => void reject.run()} isDisabled={reject.pending}>
+          {reject.pending ? <LoaderCircle className="animate-spin" /> : <X />}
+          Reject
         </Button>
         <Button size="xs" onPress={() => void approve.run()} isDisabled={approve.pending}>
           {approve.pending ? <LoaderCircle className="animate-spin" /> : <Check />}
-          Authorize
+          Accept
         </Button>
       </div>
     </div>
@@ -159,13 +189,14 @@ function AuthorizedRow({ entry, onDone }: { entry: PeerAuthorized; onDone: () =>
     <div className="flex items-center justify-between gap-3 rounded-lg border border-border px-3 py-2">
       <div className="min-w-0">
         <p className="flex items-center gap-1.5 text-sm font-medium">
-          <BadgeCheck className={cn('size-4', 'text-emerald-500')} aria-hidden />
+          <BadgeCheck className="size-4 text-emerald-500" aria-hidden />
           {entry.service}
         </p>
         <p className="truncate font-mono text-xs text-muted-foreground">
           {entry.fingerprint}
           <span className="ml-2 text-muted-foreground/70">by {entry.approved_by}</span>
         </p>
+        <p className="text-xs text-muted-foreground/70">Accepted {fmtTime(entry.approved_at)}</p>
       </div>
       <Button
         size="xs"
@@ -179,3 +210,46 @@ function AuthorizedRow({ entry, onDone }: { entry: PeerAuthorized; onDone: () =>
     </div>
   )
 }
+
+function RevokedRow({ entry, onDone }: { entry: PeerAuthorized; onDone: () => void }) {
+  const reauthorize = useAsyncAction(async () => {
+    try {
+      await approvePeer(entry.service, entry.fingerprint)
+      toast.success(`Re-authorized ${entry.service}`, {
+        description: shortFingerprint(entry.fingerprint),
+      })
+      onDone()
+    } catch (error) {
+      toast.error(`Failed to re-authorize ${entry.service}`, { description: errorMessage(error) })
+    }
+  })
+
+  return (
+    <div
+      className={cn(
+        'flex items-center justify-between gap-3 rounded-lg border border-border bg-muted/30 px-3 py-2'
+      )}
+    >
+      <div className="min-w-0">
+        <p className="flex items-center gap-1.5 text-sm font-medium text-muted-foreground">
+          <X className="size-4 text-muted-foreground/60" aria-hidden />
+          {entry.service}
+        </p>
+        <p className="truncate font-mono text-xs text-muted-foreground/80">
+          {entry.fingerprint}
+          <span className="ml-2 text-muted-foreground/60">by {entry.approved_by}</span>
+        </p>
+        <p className="text-xs text-muted-foreground/70">Revoked {fmtTime(entry.revoked_at)}</p>
+      </div>
+      <Button
+        size="xs"
+        variant="outline"
+        onPress={() => void reauthorize.run()}
+        isDisabled={reauthorize.pending}
+      >
+        {reauthorize.pending ? <LoaderCircle className="animate-spin" /> : <RotateCcw />}
+        Re-authorize
+      </Button>
+    </div>
+  )
+}

src/frontend/src/lib/api/peers.ts

@@ -37,3 +37,8 @@ export function approvePeer(service: string, fingerprint: string): Promise<void>
 export function revokePeer(service: string, fingerprint: string): Promise<void> {
   return post<void>('/api/peers/revoke', { service, fingerprint })
 }
+
+/** Rejects a pending first-contact request without authorizing it. */
+export function rejectPeer(service: string, fingerprint: string): Promise<void> {
+  return post<void>('/api/peers/reject', { service, fingerprint })
+}

src/handlers/peers/peers.go

@@ -114,6 +114,26 @@ func (h *Handler) Revoke(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]string{"status": "revoked"})
 }
 
+// Reject serves POST /api/peers/reject — denies a pending first-contact
+// request without authorizing it (the auth service drops the request and
+// audits the decision).
+func (h *Handler) Reject(w http.ResponseWriter, r *http.Request) {
+	var action authzAction
+	if !decodeAction(r, w, &action) {
+		return
+	}
+	client, err := h.ensureClient()
+	if err != nil {
+		http.Error(w, "auth management client unavailable: "+err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if err := client.Reject(r.Context(), action.Service, action.Fingerprint); err != nil {
+		http.Error(w, "failed to reject peer: "+err.Error(), http.StatusBadGateway)
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]string{"status": "rejected"})
+}
+
 func (h *Handler) ensureClient() (*authmgmt.Client, error) {
 	h.mu.Lock()
 	defer h.mu.Unlock()

src/lib/authmgmt/client.go

@@ -204,6 +204,13 @@ func (c *Client) Revoke(ctx context.Context, service, fingerprint string) error
 		authzRequest{Service: service, Fingerprint: fingerprint}, nil)
 }
 
+// Reject denies a pending first-contact request: the request is dropped and
+// audited; the peer stays on the no-op path until the owner approves it.
+func (c *Client) Reject(ctx context.Context, service, fingerprint string) error {
+	return c.do(ctx, http.MethodPost, "/internal/reject",
+		authzRequest{Service: service, Fingerprint: fingerprint}, nil)
+}
+
 func (c *Client) do(ctx context.Context, method, path string, body, out any) error {
 	var payload []byte
 	if body != nil {

src/main.go

@@ -113,6 +113,7 @@ func main() {
 	mux.HandleFunc("/api/peers/attestation", peersHandler.Attestation)
 	mux.HandleFunc("/api/peers/approve", peersHandler.Approve)
 	mux.HandleFunc("/api/peers/revoke", peersHandler.Revoke)
+	mux.HandleFunc("/api/peers/reject", peersHandler.Reject)
 
 	frontendDir, err := fs.Sub(embeddedFrontend, "frontend/dist")
 	if err != nil {