open-consul/agent/grpc-external/services/connectca/sign.go

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package connectca
import (
"context"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/connect"
external "github.com/hashicorp/consul/agent/grpc-external"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/proto-public/pbconnectca"
)
// Sign a leaf certificate for the service or agent identified by the SPIFFE
// ID in the given CSR's SAN.
func (s *Server) Sign(ctx context.Context, req *pbconnectca.SignRequest) (*pbconnectca.SignResponse, error) {
if err := s.requireConnect(); err != nil {
return nil, err
}
logger := s.Logger.Named("sign").With("request_id", external.TraceID())
logger.Trace("request received")
token := external.TokenFromContext(ctx)
if req.Csr == "" {
return nil, status.Error(codes.InvalidArgument, "CSR is required")
}
// For private/internal gRPC handlers, protoc-gen-rpc-glue generates the
// requisite methods to satisfy the structs.RPCInfo interface using fields
// from the pbcommon package. This service is public, so we can't use those
// fields in our proto definition. Instead, we construct our RPCInfo manually.
//
// Embedding WriteRequest ensures RPCs are forwarded to the leader, embedding
// DCSpecificRequest adds the RequestDatacenter method (but as we're not
// setting Datacenter it has the effect of *not* doing DC forwarding).
var rpcInfo struct {
structs.WriteRequest
structs.DCSpecificRequest
}
rpcInfo.Token = token
var rsp *pbconnectca.SignResponse
handled, err := s.ForwardRPC(&rpcInfo, func(conn *grpc.ClientConn) error {
logger.Trace("forwarding RPC")
ctx := external.ForwardMetadataContext(ctx)
var err error
rsp, err = pbconnectca.NewConnectCAServiceClient(conn).Sign(ctx, req)
return err
})
if handled || err != nil {
return rsp, err
}
csr, err := connect.ParseCSR(req.Csr)
if err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
authz, err := s.ACLResolver.ResolveTokenAndDefaultMeta(token, nil, nil)
if err != nil {
return nil, status.Error(codes.Unauthenticated, err.Error())
}
cert, err := s.CAManager.AuthorizeAndSignCertificate(csr, authz)
switch {
case connect.IsInvalidCSRError(err):
return nil, status.Error(codes.InvalidArgument, err.Error())
case acl.IsErrPermissionDenied(err):
return nil, status.Error(codes.PermissionDenied, err.Error())
case isRateLimitError(err):
return nil, status.Error(codes.ResourceExhausted, err.Error())
case err != nil:
logger.Error("failed to sign leaf certificate", "error", err.Error())
return nil, status.Error(codes.Internal, "failed to sign leaf certificate")
}
return &pbconnectca.SignResponse{
CertPem: cert.CertPEM,
}, nil
}
// TODO(agentless): CAManager currently lives in the `agent/consul` package and
// returns ErrRateLimited which we can't reference directly here because it'd
// create an import cycle. Checking the error message like this is fragile, but
// because of net/rpc's limited error handling support it's what we already do
// on the client. We should either move the error constant so that can use it
// here, or perhaps make it a typed error?
func isRateLimitError(err error) bool {
return err != nil && strings.Contains(err.Error(), "limit reached")
}