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

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

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/tokenserver/api/admin/v1/config.proto
 // DO NOT EDIT!
 
 package admin
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 
@@ skipping 87 matching lines @@
 
 func (m *DelegationPermissions) GetRules() []*DelegationRule {
         if m != nil {
                 return m.Rules
         }
         return nil
 }
 
 // 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.
 //  * 'services' - a set of services that should accept the token.
 //
 // A request matches a rule iff:
 //  * 'requestor_id' is in 'requestor' set.
 //  * 'delegated_identity' is in 'allowed_to_impersonate' set.
 //  * 'audience' is a subset of 'allowed_audience' set.
 //  * 'services' is a subset of 'target_service' set.
 //
 // The presence of a matching rule permits to mint the token. The rule also
 // provides an upper bound on allowed validity_duration, and the rule's name
 // is logged in the audit trail.
 type DelegationRule struct {
         // A descriptive name of this rule, for the audit log.
         Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
         // Email of developers that added this rule, to know who to contact.
         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>").
         //  * A special identifier "REQUESTOR" that is substituted by the requestor
         //    identity when evaluating the rule.
         //
         // "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.
         //
         // Default is 12 hours.
         MaxValidityDuration int64 `protobuf:"varint,7,opt,name=max_validity_duration,json=maxValidityDuration" json:"max_validity_duration,omitempty"`
 }
 
 func (m *DelegationRule) Reset()                    { *m = DelegationRule{} }
 func (m *DelegationRule) String() string            { return proto.CompactTextString(m) }
 func (*DelegationRule) ProtoMessage()               {}
 func (*DelegationRule) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{4} }
 
 func init() {
         proto.RegisterType((*TokenServerConfig)(nil), "tokenserver.admin.TokenServerConfig")
         proto.RegisterType((*CertificateAuthorityConfig)(nil), "tokenserver.admin.CertificateAuthorityConfig")
         proto.RegisterType((*DomainConfig)(nil), "tokenserver.admin.DomainConfig")
         proto.RegisterType((*DelegationPermissions)(nil), "tokenserver.admin.DelegationPermissions")
         proto.RegisterType((*DelegationRule)(nil), "tokenserver.admin.DelegationRule")
 }
 
 func init() {
         proto.RegisterFile("github.com/luci/luci-go/tokenserver/api/admin/v1/config.proto", fileDescriptor2)
 }
 
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 }