open-consul/agent/token/store.go

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package token
import (
"sync"
"crypto/subtle"
)
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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type TokenSource bool
const (
TokenSourceConfig TokenSource = false
TokenSourceAPI TokenSource = true
)
type TokenKind int
const (
TokenKindAgent TokenKind = iota
TokenKindAgentMaster
TokenKindUser
TokenKindReplication
)
type watcher struct {
kind TokenKind
ch chan<- struct{}
}
// Notifier holds the channel used to notify a watcher
// of token updates as well as some internal tracking
// information to allow for deregistering the notifier.
type Notifier struct {
id int
Ch <-chan struct{}
}
// Store is used to hold the special ACL tokens used by Consul agents. It is
// designed to update the tokens on the fly, so the token store itself should be
// plumbed around and used to get tokens at runtime, don't save the resulting
// tokens.
type Store struct {
// l synchronizes access to the token store.
l sync.RWMutex
// userToken is passed along for requests when the user didn't supply a
// token, and may be left blank to use the anonymous token. This will
// also be used for agent operations if the agent token isn't set.
userToken string
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// userTokenSource indicates where this token originated from
userTokenSource TokenSource
// agentToken is used for internal agent operations like self-registering
// with the catalog and anti-entropy, but should never be used for
// user-initiated operations.
agentToken string
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// agentTokenSource indicates where this token originated from
agentTokenSource TokenSource
// agentMasterToken is a special token that's only used locally for
// access to the /v1/agent utility operations if the servers aren't
// available.
agentMasterToken string
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// agentMasterTokenSource indicates where this token originated from
agentMasterTokenSource TokenSource
// replicationToken is a special token that's used by servers to
// replicate data from the primary datacenter.
replicationToken string
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// replicationTokenSource indicates where this token originated from
replicationTokenSource TokenSource
watchers map[int]watcher
watcherIndex int
// enterpriseTokens contains tokens only used in consul-enterprise
enterpriseTokens
}
// Notify will set up a watch for when tokens of the desired kind is changed
func (t *Store) Notify(kind TokenKind) Notifier {
// buffering ensures that notifications aren't missed if the watcher
// isn't already in a select and that our notifications don't
// block returning from the Update* methods.
ch := make(chan struct{}, 1)
w := watcher{
kind: kind,
ch: ch,
}
t.l.Lock()
defer t.l.Unlock()
if t.watchers == nil {
t.watchers = make(map[int]watcher)
}
// we specifically want to avoid the zero-value to prevent accidental stop-notification requests
t.watcherIndex += 1
t.watchers[t.watcherIndex] = w
return Notifier{id: t.watcherIndex, Ch: ch}
}
// StopNotify stops the token store from sending notifications to the specified notifiers chan
func (t *Store) StopNotify(n Notifier) {
t.l.Lock()
defer t.l.Unlock()
delete(t.watchers, n.id)
}
// anyKindAllowed returns true if any of the kinds in the `check` list are
// set to be allowed in the `allowed` map.
//
// Note: this is mostly just a convenience to simplify the code in
// sendNotificationLocked and prevent more nested looping with breaks/continues
// and other state tracking.
func anyKindAllowed(allowed TokenKind, check []TokenKind) bool {
for _, kind := range check {
if allowed == kind {
return true
}
}
return false
}
// sendNotificationLocked will iterate through all watchers and notify them that a
// token they are watching has been updated.
//
// NOTE: this function explicitly does not attempt to send the kind or new token value
// along through the channel. With that approach watchers could potentially miss updates
// if the buffered chan fills up. Instead with this approach we just notify that any
// token they care about has been udpated and its up to the caller to retrieve the
// new value (after receiving from the chan). With this approach its entirely possible
// for the watcher to be notified twice before actually retrieving the token after the first
// read from the chan. This is better behavior than missing events. It can cause some
// churn temporarily but in common cases its not expected that these tokens would be updated
// frequently enough to cause this to happen.
func (t *Store) sendNotificationLocked(kinds ...TokenKind) {
for _, watcher := range t.watchers {
if !anyKindAllowed(watcher.kind, kinds) {
// ignore this watcher as it doesn't want events for these kinds of token
continue
}
select {
case watcher.ch <- struct{}{}:
default:
// its already pending a notification
}
}
}
// UpdateUserToken replaces the current user token in the store.
// Returns true if it was changed.
func (t *Store) UpdateUserToken(token string, source TokenSource) bool {
t.l.Lock()
changed := (t.userToken != token || t.userTokenSource != source)
t.userToken = token
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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t.userTokenSource = source
if changed {
t.sendNotificationLocked(TokenKindUser)
}
t.l.Unlock()
return changed
}
// UpdateAgentToken replaces the current agent token in the store.
// Returns true if it was changed.
func (t *Store) UpdateAgentToken(token string, source TokenSource) bool {
t.l.Lock()
changed := (t.agentToken != token || t.agentTokenSource != source)
t.agentToken = token
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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t.agentTokenSource = source
if changed {
t.sendNotificationLocked(TokenKindAgent)
}
t.l.Unlock()
return changed
}
// UpdateAgentMasterToken replaces the current agent master token in the store.
// Returns true if it was changed.
func (t *Store) UpdateAgentMasterToken(token string, source TokenSource) bool {
t.l.Lock()
changed := (t.agentMasterToken != token || t.agentMasterTokenSource != source)
t.agentMasterToken = token
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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t.agentMasterTokenSource = source
if changed {
t.sendNotificationLocked(TokenKindAgentMaster)
}
t.l.Unlock()
return changed
}
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// UpdateReplicationToken replaces the current replication token in the store.
// Returns true if it was changed.
func (t *Store) UpdateReplicationToken(token string, source TokenSource) bool {
t.l.Lock()
changed := (t.replicationToken != token || t.replicationTokenSource != source)
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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t.replicationToken = token
t.replicationTokenSource = source
if changed {
t.sendNotificationLocked(TokenKindReplication)
}
t.l.Unlock()
return changed
}
// UserToken returns the best token to use for user operations.
func (t *Store) UserToken() string {
t.l.RLock()
defer t.l.RUnlock()
return t.userToken
}
// AgentToken returns the best token to use for internal agent operations.
func (t *Store) AgentToken() string {
t.l.RLock()
defer t.l.RUnlock()
if tok := t.enterpriseAgentToken(); tok != "" {
return tok
}
if t.agentToken != "" {
return t.agentToken
}
return t.userToken
}
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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func (t *Store) AgentMasterToken() string {
t.l.RLock()
defer t.l.RUnlock()
return t.agentMasterToken
}
// ReplicationToken returns the replication token.
func (t *Store) ReplicationToken() string {
t.l.RLock()
defer t.l.RUnlock()
return t.replicationToken
}
// UserToken returns the best token to use for user operations.
func (t *Store) UserTokenAndSource() (string, TokenSource) {
t.l.RLock()
defer t.l.RUnlock()
return t.userToken, t.userTokenSource
}
// AgentToken returns the best token to use for internal agent operations.
func (t *Store) AgentTokenAndSource() (string, TokenSource) {
t.l.RLock()
defer t.l.RUnlock()
return t.agentToken, t.agentTokenSource
}
func (t *Store) AgentMasterTokenAndSource() (string, TokenSource) {
t.l.RLock()
defer t.l.RUnlock()
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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return t.agentMasterToken, t.agentMasterTokenSource
}
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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// ReplicationToken returns the replication token.
func (t *Store) ReplicationTokenAndSource() (string, TokenSource) {
t.l.RLock()
defer t.l.RUnlock()
ACL Token Persistence and Reloading (#5328) This PR adds two features which will be useful for operators when ACLs are in use. 1. Tokens set in configuration files are now reloadable. 2. If `acl.enable_token_persistence` is set to `true` in the configuration, tokens set via the `v1/agent/token` endpoint are now persisted to disk and loaded when the agent starts (or during configuration reload) Note that token persistence is opt-in so our users who do not want tokens on the local disk will see no change. Some other secondary changes: * Refactored a bunch of places where the replication token is retrieved from the token store. This token isn't just for replicating ACLs and now it is named accordingly. * Allowed better paths in the `v1/agent/token/` API. Instead of paths like: `v1/agent/token/acl_replication_token` the path can now be just `v1/agent/token/replication`. The old paths remain to be valid. * Added a couple new API functions to set tokens via the new paths. Deprecated the old ones and pointed to the new names. The names are also generally better and don't imply that what you are setting is for ACLs but rather are setting ACL tokens. There is a minor semantic difference there especially for the replication token as again, its no longer used only for ACL token/policy replication. The new functions will detect 404s and fallback to using the older token paths when talking to pre-1.4.3 agents. * Docs updated to reflect the API additions and to show using the new endpoints. * Updated the ACL CLI set-agent-tokens command to use the non-deprecated APIs.
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return t.replicationToken, t.replicationTokenSource
}
// IsAgentMasterToken checks to see if a given token is the agent master token.
// This will never match an empty token for safety.
func (t *Store) IsAgentMasterToken(token string) bool {
t.l.RLock()
defer t.l.RUnlock()
return (token != "") && (subtle.ConstantTimeCompare([]byte(token), []byte(t.agentMasterToken)) == 1)
}