445 lines
14 KiB
Go
445 lines
14 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package auth
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import (
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"errors"
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"fmt"
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"time"
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"github.com/hashicorp/go-memdb"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/lib"
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)
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// ErrCannotWriteGlobalToken indicates that writing a token failed because
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// the token is global and this is a non-primary datacenter.
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var ErrCannotWriteGlobalToken = errors.New("Cannot upsert global tokens within this datacenter")
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// NewTokenWriter creates a new token writer.
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func NewTokenWriter(cfg TokenWriterConfig) *TokenWriter {
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return &TokenWriter{cfg}
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}
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// TokenWriter encapsulates the logic of writing ACL tokens to the state store
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// including validation, cache purging, etc.
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type TokenWriter struct {
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TokenWriterConfig
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}
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type TokenWriterConfig struct {
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RaftApply RaftApplyFn
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ACLCache ACLCache
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Store TokenWriterStore
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CheckUUID lib.UUIDCheckFunc
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MaxExpirationTTL time.Duration
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MinExpirationTTL time.Duration
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PrimaryDatacenter string
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InPrimaryDatacenter bool
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LocalTokensEnabled bool
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}
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type RaftApplyFn func(structs.MessageType, interface{}) (interface{}, error)
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//go:generate mockery --name ACLCache --inpackage
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type ACLCache interface {
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RemoveIdentityWithSecretToken(secretToken string)
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}
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type TokenWriterStore interface {
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ACLTokenGetByAccessor(ws memdb.WatchSet, accessorID string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLToken, error)
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ACLTokenGetBySecret(ws memdb.WatchSet, secretID string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLToken, error)
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ACLRoleGetByID(ws memdb.WatchSet, id string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLRole, error)
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ACLRoleGetByName(ws memdb.WatchSet, name string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLRole, error)
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ACLPolicyGetByID(ws memdb.WatchSet, id string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLPolicy, error)
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ACLPolicyGetByName(ws memdb.WatchSet, name string, entMeta *acl.EnterpriseMeta) (uint64, *structs.ACLPolicy, error)
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ACLTokenUpsertValidateEnterprise(token *structs.ACLToken, existing *structs.ACLToken) error
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}
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// Create a new token. Setting fromLogin to true changes behavior slightly for
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// tokens created by login (as opposed to set manually via the API).
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func (w *TokenWriter) Create(token *structs.ACLToken, fromLogin bool) (*structs.ACLToken, error) {
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if err := w.checkCanWriteToken(token); err != nil {
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return nil, err
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}
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if token.AccessorID == "" {
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// Caller didn't provide an AccessorID, so generate one.
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id, err := lib.GenerateUUID(w.CheckUUID)
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if err != nil {
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return nil, fmt.Errorf("Failed to generate AccessorID: %w", err)
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}
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token.AccessorID = id
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} else {
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// Check the AccessorID is valid and not already in-use.
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if err := validateTokenID(token.AccessorID); err != nil {
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return nil, fmt.Errorf("Invalid Token: AccessorID - %w", err)
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}
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if inUse, err := w.tokenIDInUse(token.AccessorID); err != nil {
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return nil, fmt.Errorf("Failed to lookup ACL token: %w", err)
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} else if inUse {
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return nil, errors.New("Invalid Token: AccessorID is already in use")
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}
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}
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if token.SecretID == "" {
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// Caller didn't provide a SecretID, so generate one.
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id, err := lib.GenerateUUID(w.CheckUUID)
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if err != nil {
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return nil, fmt.Errorf("Failed to generate SecretID: %w", err)
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}
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token.SecretID = id
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} else {
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// Check the SecretID is valid and not already in-use.
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if err := validateTokenID(token.SecretID); err != nil {
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return nil, fmt.Errorf("Invalid Token: SecretID - %w", err)
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}
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if inUse, err := w.tokenIDInUse(token.SecretID); err != nil {
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return nil, fmt.Errorf("Failed to lookup ACL token: %w", err)
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} else if inUse {
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return nil, errors.New("Invalid Token: SecretID is already in use")
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}
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}
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token.CreateTime = time.Now()
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// Ensure ExpirationTTL is valid if provided.
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if token.ExpirationTTL < 0 {
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return nil, fmt.Errorf("Token Expiration TTL '%s' should be > 0", token.ExpirationTTL)
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} else if token.ExpirationTTL > 0 {
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if token.HasExpirationTime() {
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return nil, errors.New("Token Expiration TTL and Expiration Time cannot both be set")
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}
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expirationTime := token.CreateTime.Add(token.ExpirationTTL)
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token.ExpirationTime = &expirationTime
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token.ExpirationTTL = 0
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}
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if token.HasExpirationTime() {
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if token.ExpirationTime.Before(token.CreateTime) {
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return nil, errors.New("ExpirationTime cannot be before CreateTime")
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}
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expiresIn := token.ExpirationTime.Sub(token.CreateTime)
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if expiresIn > w.MaxExpirationTTL {
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return nil, fmt.Errorf("ExpirationTime cannot be more than %s in the future (was %s)",
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w.MaxExpirationTTL, expiresIn)
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}
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if expiresIn < w.MinExpirationTTL {
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return nil, fmt.Errorf("ExpirationTime cannot be less than %s in the future (was %s)",
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w.MinExpirationTTL, expiresIn)
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}
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}
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if fromLogin {
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if token.AuthMethod == "" {
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return nil, errors.New("AuthMethod field is required during login")
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}
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} else {
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if token.AuthMethod != "" {
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return nil, errors.New("AuthMethod field is disallowed outside of login")
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}
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}
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return w.write(token, nil, fromLogin)
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}
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// Update an existing token.
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func (w *TokenWriter) Update(token *structs.ACLToken) (*structs.ACLToken, error) {
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if err := w.checkCanWriteToken(token); err != nil {
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return nil, err
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}
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if _, err := uuid.ParseUUID(token.AccessorID); err != nil {
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return nil, errors.New("AccessorID is not a valid UUID")
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}
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// DEPRECATED (ACL-Legacy-Compat) - maybe get rid of this in the future
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// and instead do a ParseUUID check. New tokens will not have
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// secrets generated by users but rather they will always be UUIDs.
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// However if users just continue the upgrade cycle they may still
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// have tokens using secrets that are not UUIDS
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// The RootAuthorizer checks that the SecretID is not "allow", "deny"
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// or "manage" as a precaution against something accidentally using
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// one of these root policies by setting the secret to it.
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if acl.RootAuthorizer(token.SecretID) != nil {
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return nil, acl.PermissionDeniedError{Cause: "Cannot modify root ACL"}
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}
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_, match, err := w.Store.ACLTokenGetByAccessor(nil, token.AccessorID, nil)
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switch {
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case err != nil:
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return nil, fmt.Errorf("Failed acl token lookup by accessor: %w", err)
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case match == nil || match.IsExpired(time.Now()):
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return nil, fmt.Errorf("Cannot find token %q", token.AccessorID)
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}
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if token.SecretID == "" {
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token.SecretID = match.SecretID
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} else if match.SecretID != token.SecretID {
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return nil, errors.New("Changing a token's SecretID is not permitted")
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}
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if token.Local != match.Local {
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return nil, fmt.Errorf("Cannot toggle local mode of %s", token.AccessorID)
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}
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if token.AuthMethod == "" {
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token.AuthMethod = match.AuthMethod
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} else if match.AuthMethod != token.AuthMethod {
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return nil, fmt.Errorf("Cannot change AuthMethod of %s", token.AccessorID)
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}
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if token.ExpirationTTL != 0 {
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return nil, fmt.Errorf("Cannot change expiration time of %s", token.AccessorID)
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}
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if token.HasExpirationTime() {
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if !match.HasExpirationTime() || !match.ExpirationTime.Equal(*token.ExpirationTime) {
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return nil, fmt.Errorf("Cannot change expiration time of %s", token.AccessorID)
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}
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} else {
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token.ExpirationTime = match.ExpirationTime
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}
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token.CreateTime = match.CreateTime
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return w.write(token, match, false)
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}
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// Delete the ACL token with the given SecretID from the state store.
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func (w *TokenWriter) Delete(secretID string, fromLogout bool) error {
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_, token, err := w.Store.ACLTokenGetBySecret(nil, secretID, nil)
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switch {
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case err != nil:
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return err
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case token == nil:
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return acl.ErrNotFound
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case token.AuthMethod == "" && fromLogout:
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return fmt.Errorf("%w: token wasn't created via login", acl.ErrPermissionDenied)
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}
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if err := w.checkCanWriteToken(token); err != nil {
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return err
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}
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if _, err := w.RaftApply(structs.ACLTokenDeleteRequestType, &structs.ACLTokenBatchDeleteRequest{
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TokenIDs: []string{token.AccessorID},
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}); err != nil {
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return fmt.Errorf("Failed to apply token delete request: %w", err)
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}
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w.ACLCache.RemoveIdentityWithSecretToken(token.SecretID)
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return nil
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}
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func validateTokenID(id string) error {
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if structs.ACLIDReserved(id) {
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return fmt.Errorf("UUIDs with the prefix %q are reserved", structs.ACLReservedIDPrefix)
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}
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if _, err := uuid.ParseUUID(id); err != nil {
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return errors.New("not a valid UUID")
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}
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return nil
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}
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func (w *TokenWriter) checkCanWriteToken(token *structs.ACLToken) error {
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if !w.LocalTokensEnabled {
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return fmt.Errorf("Cannot upsert tokens within this datacenter")
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}
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if !w.InPrimaryDatacenter && !token.Local {
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return ErrCannotWriteGlobalToken
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}
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return nil
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}
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func (w *TokenWriter) tokenIDInUse(id string) (bool, error) {
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_, accessorMatch, err := w.Store.ACLTokenGetByAccessor(nil, id, nil)
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switch {
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case err != nil:
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return false, err
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case accessorMatch != nil:
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return true, nil
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}
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_, secretMatch, err := w.Store.ACLTokenGetBySecret(nil, id, nil)
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switch {
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case err != nil:
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return false, err
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case secretMatch != nil:
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return true, nil
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}
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return false, nil
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}
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func (w *TokenWriter) write(token, existing *structs.ACLToken, fromLogin bool) (*structs.ACLToken, error) {
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roles, err := w.normalizeRoleLinks(token.Roles, &token.EnterpriseMeta)
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if err != nil {
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return nil, err
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}
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token.Roles = roles
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policies, err := w.normalizePolicyLinks(token.Policies, &token.EnterpriseMeta)
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if err != nil {
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return nil, err
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}
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token.Policies = policies
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serviceIdentities, err := w.normalizeServiceIdentities(token.ServiceIdentities, token.Local)
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if err != nil {
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return nil, err
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}
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token.ServiceIdentities = serviceIdentities
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nodeIdentities, err := w.normalizeNodeIdentities(token.NodeIdentities)
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if err != nil {
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return nil, err
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}
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token.NodeIdentities = nodeIdentities
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if err := w.enterpriseValidation(token, existing); err != nil {
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return nil, err
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}
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token.SetHash(true)
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// Persist the token by writing to Raft.
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_, err = w.RaftApply(structs.ACLTokenSetRequestType, &structs.ACLTokenBatchSetRequest{
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Tokens: structs.ACLTokens{token},
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// Logins may attempt to link to roles that do not exist. These may be
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// persisted, but don't allow tokens to be created that have no privileges
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// (i.e. role links that point nowhere).
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AllowMissingLinks: fromLogin,
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ProhibitUnprivileged: fromLogin,
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})
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if err != nil {
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return nil, fmt.Errorf("Failed to apply token write request: %w", err)
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}
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// Purge the token from the ACL cache.
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w.ACLCache.RemoveIdentityWithSecretToken(token.SecretID)
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// Refresh the token from the state store.
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_, updatedToken, err := w.Store.ACLTokenGetByAccessor(nil, token.AccessorID, nil)
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if err != nil || updatedToken == nil {
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return nil, errors.New("Failed to retrieve token after insertion")
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}
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return updatedToken, nil
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}
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func (w *TokenWriter) normalizeRoleLinks(links []structs.ACLTokenRoleLink, entMeta *acl.EnterpriseMeta) ([]structs.ACLTokenRoleLink, error) {
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var normalized []structs.ACLTokenRoleLink
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uniqueIDs := make(map[string]struct{})
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for _, link := range links {
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if link.ID == "" {
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_, role, err := w.Store.ACLRoleGetByName(nil, link.Name, entMeta)
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switch {
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case err != nil:
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return nil, fmt.Errorf("Error looking up role for name: %q: %w", link.Name, err)
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case role == nil:
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return nil, fmt.Errorf("No such ACL role with name %q", link.Name)
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}
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link.ID = role.ID
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} else {
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_, role, err := w.Store.ACLRoleGetByID(nil, link.ID, entMeta)
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switch {
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case err != nil:
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return nil, fmt.Errorf("Error looking up role for ID: %q: %w", link.ID, err)
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case role == nil:
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return nil, fmt.Errorf("No such ACL role with ID %q", link.ID)
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}
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}
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// Do not persist the role name as the role could be renamed in the future.
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link.Name = ""
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// De-duplicate role links by ID.
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if _, ok := uniqueIDs[link.ID]; !ok {
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normalized = append(normalized, link)
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uniqueIDs[link.ID] = struct{}{}
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}
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}
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return normalized, nil
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}
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func (w *TokenWriter) normalizePolicyLinks(links []structs.ACLTokenPolicyLink, entMeta *acl.EnterpriseMeta) ([]structs.ACLTokenPolicyLink, error) {
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var normalized []structs.ACLTokenPolicyLink
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uniqueIDs := make(map[string]struct{})
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for _, link := range links {
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if link.ID == "" {
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_, role, err := w.Store.ACLPolicyGetByName(nil, link.Name, entMeta)
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switch {
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case err != nil:
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return nil, fmt.Errorf("Error looking up policy for name: %q: %w", link.Name, err)
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case role == nil:
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return nil, fmt.Errorf("No such ACL policy with name %q", link.Name)
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}
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link.ID = role.ID
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} else {
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_, role, err := w.Store.ACLPolicyGetByID(nil, link.ID, entMeta)
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switch {
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case err != nil:
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return nil, fmt.Errorf("Error looking up policy for ID: %q: %w", link.ID, err)
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case role == nil:
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return nil, fmt.Errorf("No such ACL policy with ID %q", link.ID)
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}
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}
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// Do not persist the role name as the role could be renamed in the future.
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link.Name = ""
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// De-duplicate role links by ID.
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if _, ok := uniqueIDs[link.ID]; !ok {
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normalized = append(normalized, link)
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uniqueIDs[link.ID] = struct{}{}
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}
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}
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return normalized, nil
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}
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func (w *TokenWriter) normalizeServiceIdentities(svcIDs structs.ACLServiceIdentities, tokenLocal bool) (structs.ACLServiceIdentities, error) {
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for _, id := range svcIDs {
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if id.ServiceName == "" {
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return nil, errors.New("Service identity is missing the service name field on this token")
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}
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if tokenLocal && len(id.Datacenters) > 0 {
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return nil, fmt.Errorf("Service identity %q cannot specify a list of datacenters on a local token", id.ServiceName)
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}
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if !acl.IsValidServiceIdentityName(id.ServiceName) {
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return nil, fmt.Errorf("Service identity %q has an invalid name. Only lowercase alphanumeric characters, '-' and '_' are allowed", id.ServiceName)
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}
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}
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return svcIDs.Deduplicate(), nil
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}
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func (w *TokenWriter) normalizeNodeIdentities(nodeIDs structs.ACLNodeIdentities) (structs.ACLNodeIdentities, error) {
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for _, id := range nodeIDs {
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if id.NodeName == "" {
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return nil, errors.New("Node identity is missing the node name field on this token")
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}
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if id.Datacenter == "" {
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return nil, errors.New("Node identity is missing the datacenter field on this token")
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}
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if !acl.IsValidNodeIdentityName(id.NodeName) {
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return nil, fmt.Errorf("Node identity has an invalid name. Only lowercase alphanumeric characters, '-' and '_' are allowed")
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}
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}
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return nodeIDs.Deduplicate(), nil
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}
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