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Published: Jul 9, 2021 License: Apache-2.0 Imports: 27 Imported by: 0



Package serviceaccountsv2 implements MintServiceAccountToken RPC.



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var GlobalMappingCache = NewMappingCache()

GlobalMappingCache is the process-wide mapping cache.


This section is empty.


type ImportProjectOwnedAccountsConfigsRPC

type ImportProjectOwnedAccountsConfigsRPC struct {
	MappingCache *MappingCache // usually GlobalMappingCache, but replaced in tests

ImportProjectOwnedAccountsConfigsRPC implements the corresponding method.

func (*ImportProjectOwnedAccountsConfigsRPC) ImportProjectOwnedAccountsConfigs

func (r *ImportProjectOwnedAccountsConfigsRPC) ImportProjectOwnedAccountsConfigs(ctx context.Context, _ *emptypb.Empty) (*admin.ImportedConfigs, error)

ImportProjectOwnedAccountsConfigs fetches configs from luci-config right now.

func (*ImportProjectOwnedAccountsConfigsRPC) SetupConfigValidation

func (r *ImportProjectOwnedAccountsConfigsRPC) SetupConfigValidation(rules *validation.RuleSet)

SetupConfigValidation registers the config validation rules.

type Mapping

type Mapping struct {
	// contains filtered or unexported fields

Mapping is a queryable representation of project_owned_accounts.cfg.

func (*Mapping) CanProjectUseAccount

func (m *Mapping) CanProjectUseAccount(project, account string) bool

CanProjectUseAccount returns true if the given project is allowed to mint tokens of the given service account.

The project name is extracted from a realm name and it can be "@internal" for internal realms.

func (*Mapping) ConfigRevision

func (m *Mapping) ConfigRevision() string

ConfigRevision is part of policy.Queryable interface.

type MappingCache

type MappingCache struct {
	// contains filtered or unexported fields

MappingCache is a stateful object with parsed project_owned_accounts.cfg.

It uses policy.Policy internally to manage datastore-cached copy of imported service accounts configs.

Use NewMappingCache() to create a new instance. Each instance owns its own in-memory cache, but uses the same shared datastore cache.

There's also a process global instance of MappingCache (GlobalMappingCache var) which is used by the main process. Unit tests don't use it though to avoid relying on shared state.

func NewMappingCache

func NewMappingCache() *MappingCache

NewMappingCache properly initializes MappingCache instance.

func (*MappingCache) ImportConfigs

func (mc *MappingCache) ImportConfigs(ctx context.Context) (rev string, err error)

ImportConfigs refetches project_owned_accounts.cfg and updates the datastore.

Called from cron.

func (*MappingCache) Mapping

func (mc *MappingCache) Mapping(ctx context.Context) (*Mapping, error)

Mapping returns in-memory copy of the mapping, ready for querying.

func (*MappingCache) SetupConfigValidation

func (mc *MappingCache) SetupConfigValidation(rules *validation.RuleSet)

SetupConfigValidation registers the config validation rules.

type MintServiceAccountTokenRPC

type MintServiceAccountTokenRPC struct {
	// Signer is used only for its ServiceInfo.
	// In prod it is the default server signer that uses server's service account.
	Signer signing.Signer

	// Mapping returns project<->account mapping to use for the request.
	// In prod it is GlobalMappingCache.Mapping.
	Mapping func(context.Context) (*Mapping, error)

	// MintAccessToken produces an OAuth token for a service account.
	// In prod it is auth.MintAccessTokenForServiceAccount.
	MintAccessToken func(context.Context, auth.MintAccessTokenParams) (*auth.Token, error)

	// MintIDToken produces an ID token for a service account.
	// In prod it is auth.MintIDTokenForServiceAccount.
	MintIDToken func(context.Context, auth.MintIDTokenParams) (*auth.Token, error)

	// LogToken is mocked in tests.
	// In prod it is produced by NewTokenLogger.
	LogToken TokenLogger

MintServiceAccountTokenRPC implements the corresponding method.

func (*MintServiceAccountTokenRPC) MintServiceAccountToken

func (r *MintServiceAccountTokenRPC) MintServiceAccountToken(ctx context.Context, req *minter.MintServiceAccountTokenRequest) (*minter.MintServiceAccountTokenResponse, error)

MintServiceAccountToken mints an OAuth2 access token or OpenID ID token that belongs to some service account using LUCI Realms for authorization.

As an input it takes a service account email and a name of a LUCI Realm the caller is operating in. To authorize the call the token server checks the following conditions:

  1. The caller has luci.serviceAccounts.mintToken permission in the realm, allowing them to "impersonate" all service accounts belonging to this realm.
  2. The service account has luci.serviceAccounts.existInRealm permission in the realm. This makes the account "belong" to the realm.
  3. Realm's LUCI project has the service account associated with it in the project_owned_accounts.cfg global config file. This makes sure different LUCI projects can't just arbitrary use each others accounts by adding them to their respective realms.cfg. See also comments for ServiceAccountsProjectMapping in api/admin/v1/config.proto.

type MintedTokenInfo

type MintedTokenInfo struct {
	Request         *minter.MintServiceAccountTokenRequest  // RPC input, as is
	Response        *minter.MintServiceAccountTokenResponse // RPC output, as is
	RequestedAt     time.Time
	OAuthScopes     []string          // normalized list of requested OAuth scopes
	RequestIdentity identity.Identity // identity used in authorization
	PeerIdentity    identity.Identity // identity of the direct peer
	ConfigRev       string            // revision of the service config
	PeerIP          net.IP            // caller's IP
	RequestID       string            // GAE request ID that handles the RPC
	AuthDBRev       int64             // revision of the authorization database

MintedTokenInfo is passed to LogToken.

It carries all information about the token minting operation and the produced token.

type TokenLogger

type TokenLogger func(context.Context, *MintedTokenInfo) error

TokenLogger records info about the token to BigQuery.

func NewTokenLogger

func NewTokenLogger(dryRun bool) TokenLogger

NewTokenLogger returns a callback that records info about tokens to BigQuery.

Tokens themselves are not logged. Only first 16 bytes of their SHA256 hashes (aka 'fingerprint') are. They are used only to identify tokens in logs.

When dryRun is true, logs to the local text log only, not to BigQuery (to avoid accidentally pushing fake data to real BigQuery dataset).

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