301 lines
8.2 KiB
Go
301 lines
8.2 KiB
Go
package consul
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import (
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"fmt"
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"strings"
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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/agent/consul/state"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/go-hclog"
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"github.com/hashicorp/go-memdb"
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)
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// KVS endpoint is used to manipulate the Key-Value store
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type KVS struct {
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srv *Server
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logger hclog.Logger
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}
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// preApply does all the verification of a KVS update that is performed BEFORE
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// we submit as a Raft log entry. This includes enforcing the lock delay which
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// must only be done on the leader.
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func kvsPreApply(logger hclog.Logger, srv *Server, authz acl.Authorizer, op api.KVOp, dirEnt *structs.DirEntry) (bool, error) {
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// Verify the entry.
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if dirEnt.Key == "" && op != api.KVDeleteTree {
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return false, fmt.Errorf("Must provide key")
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}
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// Apply the ACL policy if any.
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if authz != nil {
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switch op {
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case api.KVDeleteTree:
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var authzContext acl.AuthorizerContext
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dirEnt.FillAuthzContext(&authzContext)
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if authz.KeyWritePrefix(dirEnt.Key, &authzContext) != acl.Allow {
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return false, acl.ErrPermissionDenied
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}
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case api.KVGet, api.KVGetTree:
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// Filtering for GETs is done on the output side.
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case api.KVCheckSession, api.KVCheckIndex:
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// These could reveal information based on the outcome
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// of the transaction, and they operate on individual
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// keys so we check them here.
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var authzContext acl.AuthorizerContext
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dirEnt.FillAuthzContext(&authzContext)
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if authz.KeyRead(dirEnt.Key, &authzContext) != acl.Allow {
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return false, acl.ErrPermissionDenied
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}
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default:
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var authzContext acl.AuthorizerContext
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dirEnt.FillAuthzContext(&authzContext)
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if authz.KeyWrite(dirEnt.Key, &authzContext) != acl.Allow {
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return false, acl.ErrPermissionDenied
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}
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}
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}
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// If this is a lock, we must check for a lock-delay. Since lock-delay
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// is based on wall-time, each peer would expire the lock-delay at a slightly
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// different time. This means the enforcement of lock-delay cannot be done
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// after the raft log is committed as it would lead to inconsistent FSMs.
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// Instead, the lock-delay must be enforced before commit. This means that
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// only the wall-time of the leader node is used, preventing any inconsistencies.
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if op == api.KVLock {
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state := srv.fsm.State()
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expires := state.KVSLockDelay(dirEnt.Key, &dirEnt.EnterpriseMeta)
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if expires.After(time.Now()) {
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logger.Warn("Rejecting lock of key due to lock-delay",
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"key", dirEnt.Key,
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"expire_time", expires.String(),
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)
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return false, nil
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}
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}
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return true, nil
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}
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// Apply is used to apply a KVS update request to the data store.
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func (k *KVS) Apply(args *structs.KVSRequest, reply *bool) error {
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if done, err := k.srv.forward("KVS.Apply", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"kvs", "apply"}, time.Now())
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// Perform the pre-apply checks.
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authz, err := k.srv.ResolveTokenAndDefaultMeta(args.Token, &args.DirEnt.EnterpriseMeta, nil)
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if err != nil {
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return err
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}
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if err := k.srv.validateEnterpriseRequest(&args.DirEnt.EnterpriseMeta, true); err != nil {
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return err
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}
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ok, err := kvsPreApply(k.logger, k.srv, authz, args.Op, &args.DirEnt)
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if err != nil {
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return err
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}
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if !ok {
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*reply = false
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return nil
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}
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// Apply the update.
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resp, err := k.srv.raftApply(structs.KVSRequestType, args)
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if err != nil {
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k.logger.Error("Raft apply failed", "error", err)
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return err
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}
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if respErr, ok := resp.(error); ok {
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return respErr
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}
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// Check if the return type is a bool.
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if respBool, ok := resp.(bool); ok {
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*reply = respBool
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}
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return nil
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}
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// Get is used to lookup a single key.
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func (k *KVS) Get(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error {
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if done, err := k.srv.forward("KVS.Get", args, args, reply); done {
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return err
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}
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var authzContext acl.AuthorizerContext
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authz, err := k.srv.ResolveTokenAndDefaultMeta(args.Token, &args.EnterpriseMeta, &authzContext)
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if err != nil {
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return err
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}
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if err := k.srv.validateEnterpriseRequest(&args.EnterpriseMeta, false); err != nil {
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return err
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}
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return k.srv.blockingQuery(
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&args.QueryOptions,
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&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
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index, ent, err := state.KVSGet(ws, args.Key, &args.EnterpriseMeta)
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if err != nil {
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return err
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}
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if authz != nil && authz.KeyRead(args.Key, &authzContext) != acl.Allow {
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return acl.ErrPermissionDenied
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}
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if ent == nil {
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// Must provide non-zero index to prevent blocking
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// Index 1 is impossible anyways (due to Raft internals)
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if index == 0 {
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reply.Index = 1
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} else {
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reply.Index = index
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}
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reply.Entries = nil
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} else {
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reply.Index = ent.ModifyIndex
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reply.Entries = structs.DirEntries{ent}
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}
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return nil
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})
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}
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// List is used to list all keys with a given prefix.
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func (k *KVS) List(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error {
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if done, err := k.srv.forward("KVS.List", args, args, reply); done {
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return err
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}
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var authzContext acl.AuthorizerContext
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authz, err := k.srv.ResolveTokenAndDefaultMeta(args.Token, &args.EnterpriseMeta, &authzContext)
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if err != nil {
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return err
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}
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if err := k.srv.validateEnterpriseRequest(&args.EnterpriseMeta, false); err != nil {
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return err
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}
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if authz != nil && k.srv.config.ACLEnableKeyListPolicy && authz.KeyList(args.Key, &authzContext) != acl.Allow {
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return acl.ErrPermissionDenied
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}
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return k.srv.blockingQuery(
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&args.QueryOptions,
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&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
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index, ent, err := state.KVSList(ws, args.Key, &args.EnterpriseMeta)
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if err != nil {
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return err
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}
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if authz != nil {
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ent = FilterDirEnt(authz, ent)
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}
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if len(ent) == 0 {
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// Must provide non-zero index to prevent blocking
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// Index 1 is impossible anyways (due to Raft internals)
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if index == 0 {
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reply.Index = 1
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} else {
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reply.Index = index
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}
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reply.Entries = nil
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} else {
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reply.Index = index
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reply.Entries = ent
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}
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return nil
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})
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}
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// ListKeys is used to list all keys with a given prefix to a separator.
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// An optional separator may be specified, which can be used to slice off a part
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// of the response so that only a subset of the prefix is returned. In this
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// mode, the keys which are omitted are still counted in the returned index.
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func (k *KVS) ListKeys(args *structs.KeyListRequest, reply *structs.IndexedKeyList) error {
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if done, err := k.srv.forward("KVS.ListKeys", args, args, reply); done {
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return err
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}
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var authzContext acl.AuthorizerContext
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authz, err := k.srv.ResolveTokenAndDefaultMeta(args.Token, &args.EnterpriseMeta, &authzContext)
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if err != nil {
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return err
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}
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if err := k.srv.validateEnterpriseRequest(&args.EnterpriseMeta, false); err != nil {
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return err
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}
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if authz != nil && k.srv.config.ACLEnableKeyListPolicy && authz.KeyList(args.Prefix, &authzContext) != acl.Allow {
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return acl.ErrPermissionDenied
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}
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return k.srv.blockingQuery(
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&args.QueryOptions,
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&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
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index, entries, err := state.KVSList(ws, args.Prefix, &args.EnterpriseMeta)
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if err != nil {
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return err
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}
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// Must provide non-zero index to prevent blocking
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// Index 1 is impossible anyways (due to Raft internals)
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if index == 0 {
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reply.Index = 1
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} else {
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reply.Index = index
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}
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if authz != nil {
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entries = FilterDirEnt(authz, entries)
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}
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// Collect the keys from the filtered entries
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prefixLen := len(args.Prefix)
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sepLen := len(args.Seperator)
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var keys []string
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seen := make(map[string]bool)
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for _, e := range entries {
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// Always accumulate if no separator provided
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if sepLen == 0 {
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keys = append(keys, e.Key)
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continue
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}
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// Parse and de-duplicate the returned keys based on the
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// key separator, if provided.
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after := e.Key[prefixLen:]
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sepIdx := strings.Index(after, args.Seperator)
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if sepIdx > -1 {
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key := e.Key[:prefixLen+sepIdx+sepLen]
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if ok := seen[key]; !ok {
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keys = append(keys, key)
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seen[key] = true
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}
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} else {
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keys = append(keys, e.Key)
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}
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}
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reply.Keys = keys
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return nil
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})
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}
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