open-consul/consul/acl_endpoint.go

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package consul
import (
"fmt"
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"time"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/consul/structs"
"github.com/hashicorp/go-uuid"
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)
// ACL endpoint is used to manipulate ACLs
type ACL struct {
srv *Server
}
// Apply is used to apply a modifying request to the data store. This should
// only be used for operations that modify the data
func (a *ACL) Apply(args *structs.ACLRequest, reply *string) error {
if done, err := a.srv.forward("ACL.Apply", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"consul", "acl", "apply"}, time.Now())
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// Verify we are allowed to serve this request
if a.srv.config.ACLDatacenter != a.srv.config.Datacenter {
return fmt.Errorf(aclDisabled)
}
// Verify token is permitted to modify ACLs
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if acl, err := a.srv.resolveToken(args.Token); err != nil {
return err
} else if acl == nil || !acl.ACLModify() {
return permissionDeniedErr
}
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switch args.Op {
case structs.ACLSet:
// Verify the ACL type
switch args.ACL.Type {
case structs.ACLTypeClient:
case structs.ACLTypeManagement:
default:
return fmt.Errorf("Invalid ACL Type")
}
// Verify this is not a root ACL
if acl.RootACL(args.ACL.ID) != nil {
return fmt.Errorf("%s: Cannot modify root ACL", permissionDenied)
}
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// Validate the rules compile
_, err := acl.Parse(args.ACL.Rules)
if err != nil {
return fmt.Errorf("ACL rule compilation failed: %v", err)
}
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// If no ID is provided, generate a new ID. This must
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// be done prior to appending to the raft log, because the ID is not
// deterministic. Once the entry is in the log, the state update MUST
// be deterministic or the followers will not converge.
if args.ACL.ID == "" {
state := a.srv.fsm.State()
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for {
if args.ACL.ID, err = uuid.GenerateUUID(); err != nil {
a.srv.logger.Printf("[ERR] consul.acl: UUID generation failed: %v", err)
return err
}
_, acl, err := state.ACLGet(args.ACL.ID)
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if err != nil {
a.srv.logger.Printf("[ERR] consul.acl: ACL lookup failed: %v", err)
return err
}
if acl == nil {
break
}
}
}
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case structs.ACLDelete:
if args.ACL.ID == "" {
return fmt.Errorf("Missing ACL ID")
} else if args.ACL.ID == anonymousToken {
return fmt.Errorf("%s: Cannot delete anonymous token", permissionDenied)
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}
default:
return fmt.Errorf("Invalid ACL Operation")
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}
// Apply the update
resp, err := a.srv.raftApply(structs.ACLRequestType, args)
if err != nil {
a.srv.logger.Printf("[ERR] consul.acl: Apply failed: %v", err)
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
// Clear the cache if applicable
if args.ACL.ID != "" {
a.srv.aclAuthCache.ClearACL(args.ACL.ID)
}
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// Check if the return type is a string
if respString, ok := resp.(string); ok {
*reply = respString
}
return nil
}
// Get is used to retrieve a single ACL
func (a *ACL) Get(args *structs.ACLSpecificRequest,
reply *structs.IndexedACLs) error {
if done, err := a.srv.forward("ACL.Get", args, args, reply); done {
return err
}
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// Verify we are allowed to serve this request
if a.srv.config.ACLDatacenter != a.srv.config.Datacenter {
return fmt.Errorf(aclDisabled)
}
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// Get the local state
state := a.srv.fsm.State()
return a.srv.blockingRPC(&args.QueryOptions,
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&reply.QueryMeta,
state.GetQueryWatch("ACLGet"),
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func() error {
index, acl, err := state.ACLGet(args.ACL)
if err != nil {
return err
}
reply.Index = index
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if acl != nil {
reply.ACLs = structs.ACLs{acl}
} else {
reply.ACLs = nil
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}
return nil
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})
}
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// GetPolicy is used to retrieve a compiled policy object with a TTL. Does not
// support a blocking query.
func (a *ACL) GetPolicy(args *structs.ACLPolicyRequest, reply *structs.ACLPolicy) error {
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if done, err := a.srv.forward("ACL.GetPolicy", args, args, reply); done {
return err
}
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// Verify we are allowed to serve this request
if a.srv.config.ACLDatacenter != a.srv.config.Datacenter {
return fmt.Errorf(aclDisabled)
}
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// Get the policy via the cache
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parent, policy, err := a.srv.aclAuthCache.GetACLPolicy(args.ACL)
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if err != nil {
return err
}
// Generate an ETag
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conf := a.srv.config
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etag := fmt.Sprintf("%s:%s", parent, policy.ID)
// Setup the response
reply.ETag = etag
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reply.TTL = conf.ACLTTL
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a.srv.setQueryMeta(&reply.QueryMeta)
// Only send the policy on an Etag mis-match
if args.ETag != etag {
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reply.Parent = parent
reply.Policy = policy
}
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return nil
}
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// List is used to list all the ACLs
func (a *ACL) List(args *structs.DCSpecificRequest,
reply *structs.IndexedACLs) error {
if done, err := a.srv.forward("ACL.List", args, args, reply); done {
return err
}
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// Verify we are allowed to serve this request
if a.srv.config.ACLDatacenter != a.srv.config.Datacenter {
return fmt.Errorf(aclDisabled)
}
// Verify token is permitted to list ACLs
if acl, err := a.srv.resolveToken(args.Token); err != nil {
return err
} else if acl == nil || !acl.ACLList() {
return permissionDeniedErr
}
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// Get the local state
state := a.srv.fsm.State()
return a.srv.blockingRPC(&args.QueryOptions,
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&reply.QueryMeta,
state.GetQueryWatch("ACLList"),
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func() error {
index, acls, err := state.ACLList()
if err != nil {
return err
}
reply.Index, reply.ACLs = index, acls
return nil
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})
}