Vault: take and hash a process's own bus account (broker-<process id>) as a covered account, so take-over is not held by every process user

The controller hands each process account of a core or moved module with origin issued (ADR 0436 §2); the vault took
only broker and provisioner-broker, refused these and never hashed them. Owed hashes are now said once per pass, and
account_hash says who asked when it refuses too (review round 1).

Issue: 1945

modules/mesh-vault/cmd/mesh-vault/accounts.go

@@ -275,15 +275,19 @@ func (v *Vault) HashOwed() {
 		names = append(names, n)
 	}
 	sort.Strings(names)
+	still := map[string]string{}
 	for _, n := range names {
 		if _, held, err := v.Store.Read(n); err == nil && !held {
 			v.hashes.paid(n)
 			continue
 		}
 		if _, err := v.HashAccount(n, false); err != nil {
-			v.log("the hash of %s is still owed: %v", n, err)
+			still[n] = err.Error()
 		}
 	}
+	if len(still) > 0 {
+		v.log("%d of %d owed bus-account hashes are still owed, tried again at the next pass: %v", len(still), len(names), still)
+	}
 }
 
 // HashUser is the tool account_hash: the covered account whose value names user, hashed again now.
@@ -308,10 +312,13 @@ func (v *Vault) HashUser(user, caller string) (Hashed, error) {
 			h, err := v.HashAccount(r.Name, true)
 			if err == nil {
 				v.log("hashed %s again (%s, generation %d), asked by %s", user, r.Name, h.Generation, someoneOr(caller, "a tool"))
+			} else {
+				v.log("did not hash %s again (%s), asked by %s: %v", user, r.Name, someoneOr(caller, "a tool"), err)
 			}
 			return h, err
 		}
 	}
+	v.log("did not hash %s again, asked by %s: the vault holds no bus account of it", user, someoneOr(caller, "a tool"))
 	return Hashed{}, fmt.Errorf("the vault holds no bus account of %s: an account it holds no value for is adopted, "+
 		"never hashed here", user)
 }

modules/mesh-vault/cmd/mesh-vault/intake.go

@@ -32,7 +32,6 @@ import (
 	"errors"
 	"fmt"
 	"regexp"
-	"slices"
 	"strings"
 	"time"
 
@@ -197,15 +196,27 @@ func zero(b []byte) {
 
 // CoveredSecrets are the names, in a module's own secrets, of the bus accounts the controller mints for a core module
 // or a module marked moved and hands to the vault (novox/hq ADR 0374, issue 787): the module's account on the bus
-// (`broker`) and, for the machine's provisioner client, its own (`provisioner-broker`).
-var CoveredSecrets = []string{"broker", "provisioner-broker"}
+// (`broker`), for the machine's provisioner client its own (`provisioner-broker`), and for each process of its bus
+// declarations its own (`broker-<process id>`, ADR 0436 §2), named here by ProcessSecretPrefix.
+var CoveredSecrets = []string{"broker", "provisioner-broker", ProcessSecretPrefix + "<process id>"}
 
-// Covered says whether secret is a covered account: a module's own secret named one of CoveredSecrets. The vault
-// cannot tell core or moved from a module's manifest; the controller, which can, is the only caller that may hand
-// one in, and the name keeps what it hands to these.
+// ProcessSecretPrefix starts a process's own bus account's secret, `broker-<process id>` (the controller's
+// processSecretName).
+const ProcessSecretPrefix = "broker-"
+
+// Covered says whether secret is a covered account: a module's own secret named `broker`, `provisioner-broker` or
+// `broker-<process id>`. The vault cannot tell core or moved from a module's manifest; the controller, which can, is the
+// only caller that may hand one in, and the name keeps what it hands to these.
 func Covered(secret string) bool {
 	parts := strings.Split(secret, "/")
-	return len(parts) == 4 && parts[0] == "own" && slices.Contains(CoveredSecrets, parts[3])
+	if len(parts) != 4 || parts[0] != "own" {
+		return false
+	}
+	name := parts[3]
+	if id, process := strings.CutPrefix(name, ProcessSecretPrefix); process {
+		return id != ""
+	}
+	return name == "broker" || name == "provisioner-broker"
 }
 
 // AcceptOpen opens a call to take a value given at the controller's terminal for secret, which the terminal

modules/mesh-vault/cmd/mesh-vault/issued_account_test.go

@@ -181,6 +181,20 @@ func TestAHandedBusAccountIsHashedOncePerGeneration(t *testing.T) {
 			}
 			return err
 		}, "pw-3", 3, 6, 1},
+		{"a process's own account (ADR 0436 §2) is covered and hashed", func() error {
+			_, err := handIssued(t, v, ControllerCaller, "own/ace/mesh-build-go/broker-worker",
+				`{"node":"ace","module":"mesh-build-go","user":"ace.mesh-build-go.worker","password":"pw-w"}`)
+			if !acc.hashOf("ace.mesh-build-go.worker", "pw-w", 1) {
+				return errors.New("ace.mesh-build-go.worker is not hashed")
+			}
+			if _, rerr := v.Rotate(ControllerCaller, "own/ace/mesh-build-go/broker-worker", "jochen", "x"); rerr == nil {
+				return errors.New("the vault rotated a process's covered account")
+			}
+			if Covered("own/ace/mesh-build-go/broker-") || Covered("own/ace/mesh-build-go/brokers") {
+				return errors.New("a name that is no process account is covered")
+			}
+			return err
+		}, "pw-3", 3, 7, 1},
 	} {
 		before := len(v.bus.events)
 		if err := step.do(); err != nil {