token-server: Add protos for new API for generating service account tokens.

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

Index: tokenserver/api/admin/v1/admin.pb.go
diff --git a/tokenserver/api/admin/v1/admin.pb.go b/tokenserver/api/admin/v1/admin.pb.go
index be2058fc0538ce7c8749edacb921a7eaa2e58b6c..bb6539df190fd3463b34a80df135adc1c5da53f1 100644
--- a/tokenserver/api/admin/v1/admin.pb.go
+++ b/tokenserver/api/admin/v1/admin.pb.go
@@ -16,6 +16,8 @@ It has these top-level messages:
 	InspectMachineTokenResponse
 	InspectDelegationTokenRequest
 	InspectDelegationTokenResponse
+	InspectOAuthTokenGrantRequest
+	InspectOAuthTokenGrantResponse
 	FetchCRLRequest
 	FetchCRLResponse
 	ListCAsResponse
@@ -31,6 +33,8 @@ It has these top-level messages:
 	DomainConfig
 	DelegationPermissions
 	DelegationRule
+	ServiceAccountsPermissions
+	ServiceAccountRule
 */
 package admin
 
@@ -42,6 +46,7 @@ import math "math"
 import google_protobuf "github.com/golang/protobuf/ptypes/empty"
 import messages "github.com/luci/luci-go/server/auth/delegation/messages"
 import tokenserver "github.com/luci/luci-go/tokenserver/api"
+import tokenserver1 "github.com/luci/luci-go/tokenserver/api"
 
 import (
 	context "golang.org/x/net/context"
@@ -422,6 +427,109 @@ func (m *InspectDelegationTokenResponse) GetSubtoken() *messages.Subtoken {
 	return nil
 }
 
+// InspectOAuthTokenGrantRequest is body of InspectOAuthTokenGrant RPC call.
+type InspectOAuthTokenGrantRequest struct {
+	// The token body.
+	Token string `protobuf:"bytes,1,opt,name=token" json:"token,omitempty"`
+}
+
+func (m *InspectOAuthTokenGrantRequest) Reset()                    { *m = InspectOAuthTokenGrantRequest{} }
+func (m *InspectOAuthTokenGrantRequest) String() string            { return proto.CompactTextString(m) }
+func (*InspectOAuthTokenGrantRequest) ProtoMessage()               {}
+func (*InspectOAuthTokenGrantRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+
+func (m *InspectOAuthTokenGrantRequest) GetToken() string {
+	if m != nil {
+		return m.Token
+	}
+	return ""
+}
+
+// InspectOAuthTokenGrantResponse is return value of InspectOAuthTokenGrant RPC.
+type InspectOAuthTokenGrantResponse struct {
+	// True if the token is valid.
+	//
+	// A token is valid if its signature is correct and it hasn't expired yet.
+	Valid bool `protobuf:"varint,1,opt,name=valid" json:"valid,omitempty"`
+	// Human readable summary of why token is invalid.
+	//
+	// Summarizes the rest of the fields of this struct. Set only if 'valid' is
+	// false.
+	InvalidityReason string `protobuf:"bytes,2,opt,name=invalidity_reason,json=invalidityReason" json:"invalidity_reason,omitempty"`
+	// True if the token signature was verified.
+	//
+	// It means the token was generated by the token server and its body is not
+	// a garbage. Note that a token can be correctly signed, but invalid (if it
+	// has expired).
+	//
+	// If 'signed' is false, the fields below may (or may not) be a garbage.
+	//
+	// The token server uses private keys managed by Google Cloud Platform, they
+	// are constantly being rotated and "old" signatures become invalid over time
+	// (when corresponding keys are rotated out of existence).
+	//
+	// If 'signed' is false, use the rest of the response only as FYI, possibly
+	// invalid or even maliciously constructed.
+	Signed bool `protobuf:"varint,3,opt,name=signed" json:"signed,omitempty"`
+	// True if the token signature was verified and token hasn't expired yet.
+	//
+	// We use "non_" prefix to make default 'false' value safer.
+	NonExpired bool `protobuf:"varint,4,opt,name=non_expired,json=nonExpired" json:"non_expired,omitempty"`
+	// ID of a token server private key used to sign the token.
+	SigningKeyId string `protobuf:"bytes,5,opt,name=signing_key_id,json=signingKeyId" json:"signing_key_id,omitempty"`
+	// The deserialized token body.
+	//
+	// May be empty if token was malformed and couldn't be deserialized.
+	TokenBody *tokenserver1.OAuthTokenGrantBody `protobuf:"bytes,6,opt,name=token_body,json=tokenBody" json:"token_body,omitempty"`
+}
+
+func (m *InspectOAuthTokenGrantResponse) Reset()                    { *m = InspectOAuthTokenGrantResponse{} }
+func (m *InspectOAuthTokenGrantResponse) String() string            { return proto.CompactTextString(m) }
+func (*InspectOAuthTokenGrantResponse) ProtoMessage()               {}
+func (*InspectOAuthTokenGrantResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
+
+func (m *InspectOAuthTokenGrantResponse) GetValid() bool {
+	if m != nil {
+		return m.Valid
+	}
+	return false
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetInvalidityReason() string {
+	if m != nil {
+		return m.InvalidityReason
+	}
+	return ""
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetSigned() bool {
+	if m != nil {
+		return m.Signed
+	}
+	return false
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetNonExpired() bool {
+	if m != nil {
+		return m.NonExpired
+	}
+	return false
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetSigningKeyId() string {
+	if m != nil {
+		return m.SigningKeyId
+	}
+	return ""
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetTokenBody() *tokenserver1.OAuthTokenGrantBody {
+	if m != nil {
+		return m.TokenBody
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*ImportedConfigs)(nil), "tokenserver.admin.ImportedConfigs")
 	proto.RegisterType((*ImportedConfigs_ConfigFile)(nil), "tokenserver.admin.ImportedConfigs.ConfigFile")
@@ -429,6 +537,8 @@ func init() {
 	proto.RegisterType((*InspectMachineTokenResponse)(nil), "tokenserver.admin.InspectMachineTokenResponse")
 	proto.RegisterType((*InspectDelegationTokenRequest)(nil), "tokenserver.admin.InspectDelegationTokenRequest")
 	proto.RegisterType((*InspectDelegationTokenResponse)(nil), "tokenserver.admin.InspectDelegationTokenResponse")
+	proto.RegisterType((*InspectOAuthTokenGrantRequest)(nil), "tokenserver.admin.InspectOAuthTokenGrantRequest")
+	proto.RegisterType((*InspectOAuthTokenGrantResponse)(nil), "tokenserver.admin.InspectOAuthTokenGrantResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -442,20 +552,12 @@ const _ = grpc.SupportPackageIsVersion4
 // Client API for Admin service
 
 type AdminClient interface {
-	// ImportCAConfigs makes the server read CA configs from luci-config.
-	//
-	// This reads 'tokenserver.cfg' file.
-	//
-	// Note that regularly configs are read in background each 5 min.
-	// ImportCAConfigs can be used to force config reread immediately. It will
-	// block until the configs are read.
+	// ImportCAConfigs makes the server read 'tokenserver.cfg'.
 	ImportCAConfigs(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*ImportedConfigs, error)
-	// ImportDelegationConfigs makes the server read 'delegation.cfg' config.
-	//
-	// Note that regularly configs are read in background each 5 min.
-	// ImportDelegationConfigs can be used to force config reread immediately. It
-	// will block until the configs are read.
+	// ImportDelegationConfigs makes the server read 'delegation.cfg'.
 	ImportDelegationConfigs(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*ImportedConfigs, error)
+	// ImportServiceAccountsConfigs makes the server read 'service_accounts.cfg'.
+	ImportServiceAccountsConfigs(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*ImportedConfigs, error)
 	// InspectMachineToken decodes a machine token and verifies it is valid.
 	//
 	// It verifies the token was signed by a private key of the token server and
@@ -488,6 +590,22 @@ type AdminClient interface {
 	//   grpc.InvalidArgument error for unsupported token kind.
 	//   grpc.Internal error for transient errors.
 	InspectDelegationToken(ctx context.Context, in *InspectDelegationTokenRequest, opts ...grpc.CallOption) (*InspectDelegationTokenResponse, error)
+	// InspectOAuthTokenGrant decodes OAuth token grant and verifies it is valid.
+	//
+	// It verifies the token was signed by a private key of the token server and
+	// checks token's expiration time.
+	//
+	// It tries to give as much information about the token and its status as
+	// possible (e.g. attempts to decode the body even if the signing key has been
+	// rotated already).
+	//
+	// Administrators can use this call to debug issues with tokens.
+	//
+	// Returns:
+	//   InspectOAuthTokenGrantResponse for tokens of supported kind.
+	//   grpc.InvalidArgument error for unsupported token kind.
+	//   grpc.Internal error for transient errors.
+	InspectOAuthTokenGrant(ctx context.Context, in *InspectOAuthTokenGrantRequest, opts ...grpc.CallOption) (*InspectOAuthTokenGrantResponse, error)
 }
 type adminPRPCClient struct {
 	client *prpc.Client
@@ -515,6 +633,15 @@ func (c *adminPRPCClient) ImportDelegationConfigs(ctx context.Context, in *googl
 	return out, nil
 }
 
+func (c *adminPRPCClient) ImportServiceAccountsConfigs(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*ImportedConfigs, error) {
+	out := new(ImportedConfigs)
+	err := c.client.Call(ctx, "tokenserver.admin.Admin", "ImportServiceAccountsConfigs", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *adminPRPCClient) InspectMachineToken(ctx context.Context, in *InspectMachineTokenRequest, opts ...grpc.CallOption) (*InspectMachineTokenResponse, error) {
 	out := new(InspectMachineTokenResponse)
 	err := c.client.Call(ctx, "tokenserver.admin.Admin", "InspectMachineToken", in, out, opts...)
@@ -533,6 +660,15 @@ func (c *adminPRPCClient) InspectDelegationToken(ctx context.Context, in *Inspec
 	return out, nil
 }
 
+func (c *adminPRPCClient) InspectOAuthTokenGrant(ctx context.Context, in *InspectOAuthTokenGrantRequest, opts ...grpc.CallOption) (*InspectOAuthTokenGrantResponse, error) {
+	out := new(InspectOAuthTokenGrantResponse)
+	err := c.client.Call(ctx, "tokenserver.admin.Admin", "InspectOAuthTokenGrant", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 type adminClient struct {
 	cc *grpc.ClientConn
 }
@@ -559,6 +695,15 @@ func (c *adminClient) ImportDelegationConfigs(ctx context.Context, in *google_pr
 	return out, nil
 }
 
+func (c *adminClient) ImportServiceAccountsConfigs(ctx context.Context, in *google_protobuf.Empty, opts ...grpc.CallOption) (*ImportedConfigs, error) {
+	out := new(ImportedConfigs)
+	err := grpc.Invoke(ctx, "/tokenserver.admin.Admin/ImportServiceAccountsConfigs", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *adminClient) InspectMachineToken(ctx context.Context, in *InspectMachineTokenRequest, opts ...grpc.CallOption) (*InspectMachineTokenResponse, error) {
 	out := new(InspectMachineTokenResponse)
 	err := grpc.Invoke(ctx, "/tokenserver.admin.Admin/InspectMachineToken", in, out, c.cc, opts...)
@@ -577,23 +722,24 @@ func (c *adminClient) InspectDelegationToken(ctx context.Context, in *InspectDel
 	return out, nil
 }
 
+func (c *adminClient) InspectOAuthTokenGrant(ctx context.Context, in *InspectOAuthTokenGrantRequest, opts ...grpc.CallOption) (*InspectOAuthTokenGrantResponse, error) {
+	out := new(InspectOAuthTokenGrantResponse)
+	err := grpc.Invoke(ctx, "/tokenserver.admin.Admin/InspectOAuthTokenGrant", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Admin service
 
 type AdminServer interface {
-	// ImportCAConfigs makes the server read CA configs from luci-config.
-	//
-	// This reads 'tokenserver.cfg' file.
-	//
-	// Note that regularly configs are read in background each 5 min.
-	// ImportCAConfigs can be used to force config reread immediately. It will
-	// block until the configs are read.
+	// ImportCAConfigs makes the server read 'tokenserver.cfg'.
 	ImportCAConfigs(context.Context, *google_protobuf.Empty) (*ImportedConfigs, error)
-	// ImportDelegationConfigs makes the server read 'delegation.cfg' config.
-	//
-	// Note that regularly configs are read in background each 5 min.
-	// ImportDelegationConfigs can be used to force config reread immediately. It
-	// will block until the configs are read.
+	// ImportDelegationConfigs makes the server read 'delegation.cfg'.
 	ImportDelegationConfigs(context.Context, *google_protobuf.Empty) (*ImportedConfigs, error)
+	// ImportServiceAccountsConfigs makes the server read 'service_accounts.cfg'.
+	ImportServiceAccountsConfigs(context.Context, *google_protobuf.Empty) (*ImportedConfigs, error)
 	// InspectMachineToken decodes a machine token and verifies it is valid.
 	//
 	// It verifies the token was signed by a private key of the token server and
@@ -626,6 +772,22 @@ type AdminServer interface {
 	//   grpc.InvalidArgument error for unsupported token kind.
 	//   grpc.Internal error for transient errors.
 	InspectDelegationToken(context.Context, *InspectDelegationTokenRequest) (*InspectDelegationTokenResponse, error)
+	// InspectOAuthTokenGrant decodes OAuth token grant and verifies it is valid.
+	//
+	// It verifies the token was signed by a private key of the token server and
+	// checks token's expiration time.
+	//
+	// It tries to give as much information about the token and its status as
+	// possible (e.g. attempts to decode the body even if the signing key has been
+	// rotated already).
+	//
+	// Administrators can use this call to debug issues with tokens.
+	//
+	// Returns:
+	//   InspectOAuthTokenGrantResponse for tokens of supported kind.
+	//   grpc.InvalidArgument error for unsupported token kind.
+	//   grpc.Internal error for transient errors.
+	InspectOAuthTokenGrant(context.Context, *InspectOAuthTokenGrantRequest) (*InspectOAuthTokenGrantResponse, error)
 }
 
 func RegisterAdminServer(s prpc.Registrar, srv AdminServer) {
@@ -668,6 +830,24 @@ func _Admin_ImportDelegationConfigs_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Admin_ImportServiceAccountsConfigs_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(google_protobuf.Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AdminServer).ImportServiceAccountsConfigs(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tokenserver.admin.Admin/ImportServiceAccountsConfigs",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AdminServer).ImportServiceAccountsConfigs(ctx, req.(*google_protobuf.Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _Admin_InspectMachineToken_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(InspectMachineTokenRequest)
 	if err := dec(in); err != nil {
@@ -704,6 +884,24 @@ func _Admin_InspectDelegationToken_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Admin_InspectOAuthTokenGrant_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(InspectOAuthTokenGrantRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AdminServer).InspectOAuthTokenGrant(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tokenserver.admin.Admin/InspectOAuthTokenGrant",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AdminServer).InspectOAuthTokenGrant(ctx, req.(*InspectOAuthTokenGrantRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Admin_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "tokenserver.admin.Admin",
 	HandlerType: (*AdminServer)(nil),
@@ -717,6 +915,10 @@ var _Admin_serviceDesc = grpc.ServiceDesc{
 			Handler:    _Admin_ImportDelegationConfigs_Handler,
 		},
 		{
+			MethodName: "ImportServiceAccountsConfigs",
+			Handler:    _Admin_ImportServiceAccountsConfigs_Handler,
+		},
+		{
 			MethodName: "InspectMachineToken",
 			Handler:    _Admin_InspectMachineToken_Handler,
 		},
@@ -724,6 +926,10 @@ var _Admin_serviceDesc = grpc.ServiceDesc{
 			MethodName: "InspectDelegationToken",
 			Handler:    _Admin_InspectDelegationToken_Handler,
 		},
+		{
+			MethodName: "InspectOAuthTokenGrant",
+			Handler:    _Admin_InspectOAuthTokenGrant_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "github.com/luci/luci-go/tokenserver/api/admin/v1/admin.proto",
@@ -734,44 +940,50 @@ func init() {
 }
 
 var fileDescriptor0 = []byte{
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