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policy_store.go
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policy_store.go
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package vault
import (
"fmt"
"strings"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/golang-lru"
"github.com/hashicorp/vault/helper/consts"
"github.com/hashicorp/vault/helper/strutil"
"github.com/hashicorp/vault/logical"
)
const (
// policySubPath is the sub-path used for the policy store
// view. This is nested under the system view.
policySubPath = "policy/"
// policyCacheSize is the number of policies that are kept cached
policyCacheSize = 1024
// responseWrappingPolicyName is the name of the fixed policy
responseWrappingPolicyName = "response-wrapping"
// responseWrappingPolicy is the policy that ensures cubbyhole response
// wrapping can always succeed.
responseWrappingPolicy = `
path "cubbyhole/response" {
capabilities = ["create", "read"]
}
path "sys/wrapping/unwrap" {
capabilities = ["update"]
}
`
// defaultPolicy is the "default" policy
defaultPolicy = `
# Allow tokens to look up their own properties
path "auth/token/lookup-self" {
capabilities = ["read"]
}
# Allow tokens to renew themselves
path "auth/token/renew-self" {
capabilities = ["update"]
}
# Allow tokens to revoke themselves
path "auth/token/revoke-self" {
capabilities = ["update"]
}
# Allow a token to look up its own capabilities on a path
path "sys/capabilities-self" {
capabilities = ["update"]
}
# Allow a token to renew a lease via lease_id in the request body; old path for
# old clients, new path for newer
path "sys/renew" {
capabilities = ["update"]
}
path "sys/leases/renew" {
capabilities = ["update"]
}
# Allow looking up lease properties. This requires knowing the lease ID ahead
# of time and does not divulge any sensitive information.
path "sys/leases/lookup" {
capabilities = ["update"]
}
# Allow a token to manage its own cubbyhole
path "cubbyhole/*" {
capabilities = ["create", "read", "update", "delete", "list"]
}
# Allow a token to wrap arbitrary values in a response-wrapping token
path "sys/wrapping/wrap" {
capabilities = ["update"]
}
# Allow a token to look up the creation time and TTL of a given
# response-wrapping token
path "sys/wrapping/lookup" {
capabilities = ["update"]
}
# Allow a token to unwrap a response-wrapping token. This is a convenience to
# avoid client token swapping since this is also part of the response wrapping
# policy.
path "sys/wrapping/unwrap" {
capabilities = ["update"]
}
`
)
var (
immutablePolicies = []string{
"root",
responseWrappingPolicyName,
}
nonAssignablePolicies = []string{
responseWrappingPolicyName,
}
)
// PolicyStore is used to provide durable storage of policy, and to
// manage ACLs associated with them.
type PolicyStore struct {
view *BarrierView
lru *lru.TwoQueueCache
}
// PolicyEntry is used to store a policy by name
type PolicyEntry struct {
Version int
Raw string
}
// NewPolicyStore creates a new PolicyStore that is backed
// using a given view. It used used to durable store and manage named policy.
func NewPolicyStore(view *BarrierView, system logical.SystemView) *PolicyStore {
p := &PolicyStore{
view: view,
}
if !system.CachingDisabled() {
cache, _ := lru.New2Q(policyCacheSize)
p.lru = cache
}
return p
}
// setupPolicyStore is used to initialize the policy store
// when the vault is being unsealed.
func (c *Core) setupPolicyStore() error {
// Create a sub-view
view := c.systemBarrierView.SubView(policySubPath)
// Create the policy store
sysView := &dynamicSystemView{core: c}
c.policyStore = NewPolicyStore(view, sysView)
if sysView.ReplicationState() == consts.ReplicationSecondary {
// Policies will sync from the primary
return nil
}
// Ensure that the default policy exists, and if not, create it
policy, err := c.policyStore.GetPolicy("default")
if err != nil {
return errwrap.Wrapf("error fetching default policy from store: {{err}}", err)
}
if policy == nil {
err := c.policyStore.createDefaultPolicy()
if err != nil {
return err
}
}
// Ensure that the cubbyhole response wrapping policy exists
policy, err = c.policyStore.GetPolicy(responseWrappingPolicyName)
if err != nil {
return errwrap.Wrapf("error fetching response-wrapping policy from store: {{err}}", err)
}
if policy == nil || policy.Raw != responseWrappingPolicy {
err := c.policyStore.createResponseWrappingPolicy()
if err != nil {
return err
}
}
return nil
}
// teardownPolicyStore is used to reverse setupPolicyStore
// when the vault is being sealed.
func (c *Core) teardownPolicyStore() error {
c.policyStore = nil
return nil
}
func (ps *PolicyStore) invalidate(name string) {
if ps.lru == nil {
// Nothing to do if the cache is not used
return
}
// This may come with a prefixed "/" due to joining the file path
ps.lru.Remove(strings.TrimPrefix(name, "/"))
}
// SetPolicy is used to create or update the given policy
func (ps *PolicyStore) SetPolicy(p *Policy) error {
defer metrics.MeasureSince([]string{"policy", "set_policy"}, time.Now())
if p.Name == "" {
return fmt.Errorf("policy name missing")
}
if strutil.StrListContains(immutablePolicies, p.Name) {
return fmt.Errorf("cannot update %s policy", p.Name)
}
return ps.setPolicyInternal(p)
}
func (ps *PolicyStore) setPolicyInternal(p *Policy) error {
// Create the entry
entry, err := logical.StorageEntryJSON(p.Name, &PolicyEntry{
Version: 2,
Raw: p.Raw,
})
if err != nil {
return fmt.Errorf("failed to create entry: %v", err)
}
if err := ps.view.Put(entry); err != nil {
return fmt.Errorf("failed to persist policy: %v", err)
}
if ps.lru != nil {
// Update the LRU cache
ps.lru.Add(p.Name, p)
}
return nil
}
// GetPolicy is used to fetch the named policy
func (ps *PolicyStore) GetPolicy(name string) (*Policy, error) {
defer metrics.MeasureSince([]string{"policy", "get_policy"}, time.Now())
if ps.lru != nil {
// Check for cached policy
if raw, ok := ps.lru.Get(name); ok {
return raw.(*Policy), nil
}
}
// Special case the root policy
if name == "root" {
p := &Policy{Name: "root"}
if ps.lru != nil {
ps.lru.Add(p.Name, p)
}
return p, nil
}
// Load the policy in
out, err := ps.view.Get(name)
if err != nil {
return nil, fmt.Errorf("failed to read policy: %v", err)
}
if out == nil {
return nil, nil
}
// In Vault 0.1.X we stored the raw policy, but in
// Vault 0.2 we switch to the PolicyEntry
policyEntry := new(PolicyEntry)
var policy *Policy
if err := out.DecodeJSON(policyEntry); err == nil {
// Parse normally
p, err := Parse(policyEntry.Raw)
if err != nil {
return nil, fmt.Errorf("failed to parse policy: %v", err)
}
p.Name = name
policy = p
} else {
// On error, attempt to use V1 parsing
p, err := Parse(string(out.Value))
if err != nil {
return nil, fmt.Errorf("failed to parse policy: %v", err)
}
p.Name = name
// V1 used implicit glob, we need to do a fix-up
for _, pp := range p.Paths {
pp.Glob = true
}
policy = p
}
if ps.lru != nil {
// Update the LRU cache
ps.lru.Add(name, policy)
}
return policy, nil
}
// ListPolicies is used to list the available policies
func (ps *PolicyStore) ListPolicies() ([]string, error) {
defer metrics.MeasureSince([]string{"policy", "list_policies"}, time.Now())
// Scan the view, since the policy names are the same as the
// key names.
keys, err := logical.CollectKeys(ps.view)
for _, nonAssignable := range nonAssignablePolicies {
deleteIndex := -1
//Find indices of non-assignable policies in keys
for index, key := range keys {
if key == nonAssignable {
// Delete collection outside the loop
deleteIndex = index
break
}
}
// Remove non-assignable policies when found
if deleteIndex != -1 {
keys = append(keys[:deleteIndex], keys[deleteIndex+1:]...)
}
}
return keys, err
}
// DeletePolicy is used to delete the named policy
func (ps *PolicyStore) DeletePolicy(name string) error {
defer metrics.MeasureSince([]string{"policy", "delete_policy"}, time.Now())
if strutil.StrListContains(immutablePolicies, name) {
return fmt.Errorf("cannot delete %s policy", name)
}
if name == "default" {
return fmt.Errorf("cannot delete default policy")
}
if err := ps.view.Delete(name); err != nil {
return fmt.Errorf("failed to delete policy: %v", err)
}
if ps.lru != nil {
// Clear the cache
ps.lru.Remove(name)
}
return nil
}
// ACL is used to return an ACL which is built using the
// named policies.
func (ps *PolicyStore) ACL(names ...string) (*ACL, error) {
// Fetch the policies
var policy []*Policy
for _, name := range names {
p, err := ps.GetPolicy(name)
if err != nil {
return nil, fmt.Errorf("failed to get policy '%s': %v", name, err)
}
policy = append(policy, p)
}
// Construct the ACL
acl, err := NewACL(policy)
if err != nil {
return nil, fmt.Errorf("failed to construct ACL: %v", err)
}
return acl, nil
}
func (ps *PolicyStore) createDefaultPolicy() error {
policy, err := Parse(defaultPolicy)
if err != nil {
return errwrap.Wrapf("error parsing default policy: {{err}}", err)
}
if policy == nil {
return fmt.Errorf("parsing default policy resulted in nil policy")
}
policy.Name = "default"
return ps.setPolicyInternal(policy)
}
func (ps *PolicyStore) createResponseWrappingPolicy() error {
policy, err := Parse(responseWrappingPolicy)
if err != nil {
return errwrap.Wrapf(fmt.Sprintf("error parsing %s policy: {{err}}", responseWrappingPolicyName), err)
}
if policy == nil {
return fmt.Errorf("parsing %s policy resulted in nil policy", responseWrappingPolicyName)
}
policy.Name = responseWrappingPolicyName
return ps.setPolicyInternal(policy)
}