open-consul/agent/consul/acl_endpoint_legacy.go

290 lines
7.9 KiB
Go

package consul
import (
"fmt"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/go-memdb"
)
// Bootstrap is used to perform a one-time ACL bootstrap operation on
// a cluster to get the first management token.
func (a *ACL) Bootstrap(args *structs.DCSpecificRequest, reply *structs.ACL) error {
if done, err := a.srv.ForwardRPC("ACL.Bootstrap", args, args, reply); done {
return err
}
// Verify we are allowed to serve this request
if !a.srv.InACLDatacenter() {
return acl.ErrDisabled
}
if err := a.srv.aclBootstrapAllowed(); err != nil {
return err
}
// By doing some pre-checks we can head off later bootstrap attempts
// without having to run them through Raft, which should curb abuse.
state := a.srv.fsm.State()
allowed, _, err := state.CanBootstrapACLToken()
if err != nil {
return err
}
if !allowed {
return structs.ACLBootstrapNotAllowedErr
}
// Propose a new token.
token, err := lib.GenerateUUID(a.srv.checkTokenUUID)
if err != nil {
return fmt.Errorf("failed to make random token: %v", err)
}
// Attempt a bootstrap.
req := structs.ACLRequest{
Datacenter: a.srv.config.ACLDatacenter,
Op: structs.ACLBootstrapNow,
ACL: structs.ACL{
ID: token,
Name: "Bootstrap Token",
Type: structs.ACLTokenTypeManagement,
},
}
resp, err := a.srv.raftApply(structs.ACLRequestType, &req)
if err != nil {
return err
}
switch v := resp.(type) {
case error:
return v
case *structs.ACL:
*reply = *v
default:
// Just log this, since it looks like the bootstrap may have
// completed.
a.logger.Error("Unexpected response during bootstrap", "type", fmt.Sprintf("%T", v))
}
a.logger.Info("ACL bootstrap completed")
return nil
}
// aclApplyInternal is used to apply an ACL request after it has been vetted that
// this is a valid operation. It is used when users are updating ACLs, in which
// case we check their token to make sure they have management privileges. It is
// also used for ACL replication. We want to run the replicated ACLs through the
// same checks on the change itself.
func aclApplyInternal(srv *Server, args *structs.ACLRequest, reply *string) error {
// All ACLs must have an ID by this point.
if args.ACL.ID == "" {
return fmt.Errorf("Missing ACL ID")
}
switch args.Op {
case structs.ACLSet:
// Verify the ACL type
switch args.ACL.Type {
case structs.ACLTokenTypeClient:
case structs.ACLTokenTypeManagement:
default:
return fmt.Errorf("Invalid ACL Type")
}
// No need to check expiration times as those did not exist in legacy tokens.
_, existing, _ := srv.fsm.State().ACLTokenGetBySecret(nil, args.ACL.ID, nil)
if existing != nil && existing.UsesNonLegacyFields() {
return fmt.Errorf("Cannot use legacy endpoint to modify a non-legacy token")
}
// Verify this is not a root ACL
if acl.RootAuthorizer(args.ACL.ID) != nil {
return acl.PermissionDeniedError{Cause: "Cannot modify root ACL"}
}
// Ensure that we allow more permissive rule formats for legacy tokens,
// but that we correct them on the way into the system.
//
// DEPRECATED (ACL-Legacy-Compat)
correctedRules := structs.SanitizeLegacyACLTokenRules(args.ACL.Rules)
if correctedRules != "" {
args.ACL.Rules = correctedRules
}
// Validate the rules compile
_, err := acl.NewPolicyFromSource("", 0, args.ACL.Rules, acl.SyntaxLegacy, srv.aclConfig, nil)
if err != nil {
return fmt.Errorf("ACL rule compilation failed: %v", err)
}
case structs.ACLDelete:
if args.ACL.ID == anonymousToken {
return acl.PermissionDeniedError{Cause: "Cannot delete anonymous token"}
}
default:
return fmt.Errorf("Invalid ACL Operation")
}
// Apply the update
resp, err := srv.raftApply(structs.ACLRequestType, args)
if err != nil {
srv.logger.Error("Raft apply failed", "acl_op", args.Op, "error", err)
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
// Check if the return type is a string
if respString, ok := resp.(string); ok {
*reply = respString
}
return nil
}
// 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.ForwardRPC("ACL.Apply", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"acl", "apply"}, time.Now())
// Verify we are allowed to serve this request
if !a.srv.config.ACLsEnabled {
return acl.ErrDisabled
}
// Verify token is permitted to modify ACLs
// NOTE: We will not support enterprise authorizer contexts with legacy ACLs
if rule, err := a.srv.ResolveToken(args.Token); err != nil {
return err
} else if rule == nil || rule.ACLWrite(nil) != acl.Allow {
return acl.ErrPermissionDenied
}
// If no ID is provided, generate a new ID. This must 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.Op == structs.ACLSet && args.ACL.ID == "" {
var err error
args.ACL.ID, err = lib.GenerateUUID(a.srv.checkTokenUUID)
if err != nil {
return err
}
}
// Do the apply now that this update is vetted.
if err := aclApplyInternal(a.srv, args, reply); err != nil {
return err
}
// Clear the cache if applicable
if args.ACL.ID != "" {
a.srv.acls.cache.RemoveIdentity(tokenSecretCacheID(args.ACL.ID))
}
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.ForwardRPC("ACL.Get", args, args, reply); done {
return err
}
// NOTE: This has no ACL check because legacy ACLs were managed with
// the secrets and therefore the argument to the Get request is
// authorization in and of itself.
// Verify we are allowed to serve this request
if !a.srv.config.ACLsEnabled {
return acl.ErrDisabled
}
return a.srv.blockingQuery(&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, token, err := state.ACLTokenGetBySecret(ws, args.ACL, nil)
if err != nil {
return err
}
// Converting an ACLToken to an ACL will return nil and an error
// (which we ignore) when it is unconvertible.
//
// This also means we won't have to check expiration times since
// any legacy tokens never had expiration times and no non-legacy
// tokens can be converted.
var acl *structs.ACL
if token != nil {
acl, _ = token.Convert()
}
reply.Index = index
if acl != nil {
reply.ACLs = structs.ACLs{acl}
} else {
reply.ACLs = nil
}
return nil
})
}
// List is used to list all the ACLs
func (a *ACL) List(args *structs.DCSpecificRequest,
reply *structs.IndexedACLs) error {
if done, err := a.srv.ForwardRPC("ACL.List", args, args, reply); done {
return err
}
// Verify we are allowed to serve this request
if !a.srv.config.ACLsEnabled {
return acl.ErrDisabled
}
// Verify token is permitted to list ACLs
// NOTES: Previously with legacy ACL there was no read-only ACL permissions
// and this check for ACLWrite is basically what it did before.
if rule, err := a.srv.ResolveToken(args.Token); err != nil {
return err
} else if rule == nil || rule.ACLWrite(nil) != acl.Allow {
return acl.ErrPermissionDenied
}
return a.srv.blockingQuery(&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, tokens, err := state.ACLTokenList(ws, false, true, "", "", "", nil, nil)
if err != nil {
return err
}
now := time.Now()
var acls structs.ACLs
for _, token := range tokens {
if token.IsExpired(now) {
continue
}
if acl, err := token.Convert(); err == nil && acl != nil {
acls = append(acls, acl)
}
}
reply.Index, reply.ACLs = index, acls
return nil
})
}