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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package workercmd
import (
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"time"
"github.com/miekg/pkcs11"
"github.com/rs/zerolog/log"
"github.com/sassoftware/relic/v7/cmdline/shared"
"github.com/sassoftware/relic/v7/internal/workerrpc"
"github.com/sassoftware/relic/v7/token"
"github.com/sassoftware/relic/v7/token/tokencache"
)
// an arbitarily-chosen set of error codes that indicate that the token session
// is busted and that the worker should exit and start over
var fatalErrors = map[pkcs11Error]bool{
pkcs11.CKR_CRYPTOKI_NOT_INITIALIZED: true,
pkcs11.CKR_DEVICE_REMOVED: true,
pkcs11.CKR_GENERAL_ERROR: true,
pkcs11.CKR_HOST_MEMORY: true,
pkcs11.CKR_LIBRARY_LOAD_FAILED: true,
pkcs11.CKR_SESSION_CLOSED: true,
pkcs11.CKR_SESSION_HANDLE_INVALID: true,
pkcs11.CKR_TOKEN_NOT_PRESENT: true,
pkcs11.CKR_TOKEN_NOT_RECOGNIZED: true,
pkcs11.CKR_USER_NOT_LOGGED_IN: true,
}
func (h *handler) healthCheck() {
interval := time.Duration(shared.CurrentConfig.Server.TokenCheckInterval) * time.Second
timeout := time.Duration(shared.CurrentConfig.Server.TokenCheckTimeout) * time.Second
ppid := os.Getppid()
tick := time.NewTicker(interval)
errch := make(chan error)
for {
// check if parent process went away
if os.Getppid() != ppid {
log.Error().
Int("old_ppid", ppid).Int("new_ppid", os.Getppid()).
Msg("parent process disappeared, worker stopping")
h.shutdown()
return
}
// check if token is alive
ctx, cancel := context.WithTimeout(context.Background(), timeout)
go func() {
errch <- h.token.Ping(ctx)
}()
var err error
select {
case err = <-errch:
// ping completed
case <-ctx.Done():
// timed out
err = fmt.Errorf("timed out after %s", timeout)
}
cancel()
if err != nil {
// stop the worker on error
log.Err(err).Msg("token health check failed")
h.shutdown()
return
}
// wait for next tick
<-tick.C
}
}
type handler struct {
token *tokencache.Cache
cookie []byte
shutdown func()
}
func (h *handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
// validate auth cookie
cookie := req.Header.Get("Auth-Cookie")
if !hmac.Equal([]byte(cookie), []byte(h.cookie)) {
rw.WriteHeader(http.StatusForbidden)
return
}
// dispatch
resp, err := h.handle(rw, req)
if err != nil {
resp.Retryable = true
resp.Err = err.Error()
switch e := err.(type) {
case pkcs11Error:
if fatalErrors[e] {
log.Err(err).Msg("terminating worker due to token error")
go h.shutdown()
// errors that cause the worker to restart are also retryable
resp.Retryable = true
} else {
// pkcs11 errors not in fatalErrors are probably user error, so don't retry
resp.Retryable = false
}
case token.NotImplementedError:
resp.Retryable = false
case token.KeyUsageError:
resp.Retryable = false
resp.Usage = true
resp.Key = e.Key
resp.Err = e.Err.Error()
}
}
// marshal response
blob, err := json.Marshal(resp)
if err == nil {
_, err = rw.Write(blob)
}
if err != nil {
log.Err(err).Msg("error handling worker request")
}
}
func (h *handler) handle(rw http.ResponseWriter, req *http.Request) (resp workerrpc.Response, err error) {
blob, err := io.ReadAll(req.Body)
if err != nil {
return resp, err
}
var rr workerrpc.Request
if err := json.Unmarshal(blob, &rr); err != nil {
return resp, err
}
ctx := req.Context()
if rr.KeyID != nil {
// if the caller knows the key ID already, pass that along to ensure the
// same key is used in case it got rotated
ctx = token.WithKeyID(ctx, rr.KeyID)
}
switch req.URL.Path {
case workerrpc.Ping:
return resp, h.token.Ping(ctx)
case workerrpc.GetKey:
key, err := h.token.GetKey(ctx, rr.KeyName)
if err != nil {
return resp, err
}
resp.ID = key.GetID()
resp.Cert = key.Certificate()
resp.Value, err = x509.MarshalPKIXPublicKey(key.Public())
return resp, err
case workerrpc.Sign:
hash := crypto.Hash(rr.Hash)
opts := crypto.SignerOpts(hash)
if rr.SaltLength != nil {
opts = &rsa.PSSOptions{SaltLength: *rr.SaltLength, Hash: hash}
}
key, err := h.token.GetKey(ctx, rr.KeyName)
if err != nil {
return resp, err
}
resp.Value, err = key.SignContext(ctx, rr.Digest, opts)
return resp, err
default:
return resp, errors.New("invalid method: " + req.URL.Path)
}
}
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