open-consul/agent/consul/acl_client.go

120 lines
3.7 KiB
Go

package consul
import (
"sync/atomic"
"time"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/lib/serf"
)
var clientACLCacheConfig *structs.ACLCachesConfig = &structs.ACLCachesConfig{
// The ACL cache configuration on client agents is more conservative than
// on the servers. It is assumed that individual client agents will have
// fewer distinct identities accessing the client than a server would
// and thus can put smaller limits on the amount of ACL caching done.
//
// Identities - number of identities/acl tokens that can be cached
Identities: 1024,
// Policies - number of unparsed ACL policies that can be cached
Policies: 128,
// ParsedPolicies - number of parsed ACL policies that can be cached
ParsedPolicies: 128,
// Authorizers - number of compiled multi-policy effective policies that can be cached
Authorizers: 256,
// Roles - number of ACL roles that can be cached
Roles: 128,
}
func (c *Client) UseLegacyACLs() bool {
return atomic.LoadInt32(&c.useNewACLs) == 0
}
func (c *Client) monitorACLMode() {
waitTime := aclModeCheckMinInterval
for {
foundServers, mode, _ := ServersGetACLMode(c, "", c.config.Datacenter)
if foundServers && mode == structs.ACLModeEnabled {
c.logger.Debug("transitioned out of legacy ACL mode")
c.updateSerfTags("acls", string(structs.ACLModeEnabled))
atomic.StoreInt32(&c.useNewACLs, 1)
return
}
select {
case <-c.shutdownCh:
return
case <-time.After(waitTime):
// do nothing
}
// calculate the amount of time to wait for the next round
waitTime = waitTime * 2
if waitTime > aclModeCheckMaxInterval {
waitTime = aclModeCheckMaxInterval
}
}
}
func (c *Client) ACLDatacenter(legacy bool) string {
// For resolution running on clients, when not in
// legacy mode the servers within the current datacenter
// must be queried first to pick up local tokens. When
// in legacy mode the clients should directly query the
// ACL Datacenter. When no ACL datacenter has been set
// then we assume that the local DC is the ACL DC
if legacy && c.config.ACLDatacenter != "" {
return c.config.ACLDatacenter
}
return c.config.Datacenter
}
func (c *Client) ResolveIdentityFromToken(token string) (bool, structs.ACLIdentity, error) {
// clients do no local identity resolution at the moment
return false, nil, nil
}
func (c *Client) ResolvePolicyFromID(policyID string) (bool, *structs.ACLPolicy, error) {
// clients do no local policy resolution at the moment
return false, nil, nil
}
func (c *Client) ResolveRoleFromID(roleID string) (bool, *structs.ACLRole, error) {
// clients do no local role resolution at the moment
return false, nil, nil
}
func (c *Client) ResolveTokenToIdentity(token string) (structs.ACLIdentity, error) {
// not using ResolveTokenToIdentityAndAuthorizer because in this case we don't
// need to resolve the roles, policies and namespace but just want the identity
// information such as accessor id.
return c.acls.ResolveTokenToIdentity(token)
}
func (c *Client) ResolveTokenAndDefaultMeta(token string, entMeta *structs.EnterpriseMeta, authzContext *acl.AuthorizerContext) (acl.Authorizer, error) {
identity, authz, err := c.acls.ResolveTokenToIdentityAndAuthorizer(token)
if err != nil {
return nil, err
}
// Default the EnterpriseMeta based on the Tokens meta or actual defaults
// in the case of unknown identity
if identity != nil {
entMeta.Merge(identity.EnterpriseMetadata())
} else {
entMeta.Merge(structs.DefaultEnterpriseMeta())
}
// Use the meta to fill in the ACL authorization context
entMeta.FillAuthzContext(authzContext)
return authz, err
}
func (c *Client) updateSerfTags(key, value string) {
// Update the LAN serf
serf.UpdateTag(c.serf, key, value)
}