token-server: Delegation config import, validation and evaluation.

tokenserver/api/admin/v1/config.pb.go

Index: tokenserver/api/admin/v1/config.pb.go
diff --git a/tokenserver/api/admin/v1/config.pb.go b/tokenserver/api/admin/v1/config.pb.go
index 91edd9dae09a82d62efc8a1a6e5c8585ae98b354..31c40a69517fc8465fd4712c71fc96d22369010b 100644
--- a/tokenserver/api/admin/v1/config.pb.go
+++ b/tokenserver/api/admin/v1/config.pb.go
@@ -105,7 +105,7 @@ func (m *DelegationPermissions) GetRules() []*DelegationRule {
 
 // DelegationRule describes a single allowed case of using delegation tokens.
 //
-// An incoming MintDelegationToken request is basically a tuple of:
+// An incoming MintDelegationTokenRequest is basically a tuple of:
 //  * 'requestor_id' - an identity of whoever makes the request.
 //  * 'delegated_identity' - an identity to delegate.
 //  * 'audience' - a set of identities that will be able to use the token.
@@ -127,12 +127,19 @@ type DelegationRule struct {
 	Owner []string `protobuf:"bytes,2,rep,name=owner" json:"owner,omitempty"`
 	// A set of callers to which this rule applies.
 	//
+	// Matched against verified credentials of a caller of MintDelegationToken.
+	//
 	// Each element is either:
 	//  * An identity string ("user:<email>").
 	//  * A group reference ("group:<name>").
+	//
+	// The groups specified here are expanded when MintDelegationTokenRequest is
+	// evaluated.
 	Requestor []string `protobuf:"bytes,3,rep,name=requestor" json:"requestor,omitempty"`
 	// Identities that are allowed to be delegated/impersonated by the requestor.
 	//
+	// Matched against 'delegated_identity' field of MintDelegationTokenRequest.
+	//
 	// Each element is either:
 	//  * An identity string ("user:<email>").
 	//  * A group reference ("group:<name>").
@@ -141,22 +148,38 @@ type DelegationRule struct {
 	//
 	// "REQUESTOR" allows one to generate tokens that delegate their own identity
 	// to some target audience.
+	//
+	// The groups specified here are expanded when MintDelegationTokenRequest is
+	// evaluated.
 	AllowedToImpersonate []string `protobuf:"bytes,4,rep,name=allowed_to_impersonate,json=allowedToImpersonate" json:"allowed_to_impersonate,omitempty"`
 	// A set of identities that should be able to use the new token.
 	//
+	// Matched against 'audience' field of MintDelegationTokenRequest.
+	//
 	// Each element is either:
 	//  * An identity string ("user:<email>").
 	//  * A group reference ("group:<name>").
 	//  * A special identifier "REQUESTOR" that is substituted by the requestor
 	//    identity when evaluating the rule.
+	//  * A special token "*" that means "any bearer can use the new token,
+	//    including anonymous".
 	//
 	// "REQUESTOR" is typically used here for rules that allow requestors to
 	// impersonate someone else. The corresponding tokens have the requestor as
 	// the only allowed audience.
+	//
+	// The groups specified here are NOT expanded when MintDelegationTokenRequest
+	// is evaluated. To match the rule, MintDelegationTokenRequest must specify
+	// subset of 'allowed_audience' groups explicitly in 'audience' field.
 	AllowedAudience []string `protobuf:"bytes,5,rep,name=allowed_audience,json=allowedAudience" json:"allowed_audience,omitempty"`
 	// A set of services that should be able to accept the new token.
 	//
-	// Each element is a service identity string ("service:<id>").
+	// Matched against 'services' field of MintDelegationTokenRequest.
+	//
+	// Each element is either:
+	//  * A service identity string ("service:<id>").
+	//  * A special token "*" that mean "any LUCI service should accept the
+	//    token".
 	TargetService []string `protobuf:"bytes,6,rep,name=target_service,json=targetService" json:"target_service,omitempty"`
 	// Maximum allowed validity duration (sec) of minted delegation tokens.
 	//
@@ -182,39 +205,39 @@ func init() {
 }
 
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