/
server.go
212 lines (189 loc) · 5.67 KB
/
server.go
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package server
import (
"crypto/tls"
"fmt"
"io"
"net/http"
"runtime"
"time"
"github.com/aakso/ssh-inscribe/internal/globals"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
authbackend "github.com/aakso/ssh-inscribe/internal/auth/backend"
"github.com/aakso/ssh-inscribe/internal/config"
"github.com/aakso/ssh-inscribe/internal/keysigner"
"github.com/aakso/ssh-inscribe/internal/server/signapi"
"github.com/aakso/ssh-inscribe/internal/util"
)
type Server struct {
config *Config
web *echo.Echo
// APIs
signapi *signapi.SignApi
}
func (s *Server) Start() error {
var err error
log := Log.WithField("server_version", globals.Version())
s.web.Logger.SetOutput(io.Discard)
cc, err := s.config.GetCertificateMap()
if err != nil {
return errors.Wrap(err, "invalid certificate configuration")
}
if len(cc.Certificates) > 0 {
// Configure TLSServer before starting
tlsServer := s.web.TLSServer
tlsServer.TLSConfig = new(tls.Config)
if len(cc.Certificates) == 1 {
tlsServer.TLSConfig.Certificates = make([]tls.Certificate, 1)
tlsServer.TLSConfig.Certificates[0] = cc.Certificates[0]
} else {
tlsServer.TLSConfig.NameToCertificate = cc.CertificateMap //nolint:staticcheck // user config
tlsServer.TLSConfig.Certificates = cc.Certificates
}
tlsServer.Addr = s.config.Listen
if !s.web.DisableHTTP2 {
tlsServer.TLSConfig.NextProtos = append(tlsServer.TLSConfig.NextProtos, "h2")
}
log.WithField("listen", fmt.Sprintf("https://%s", s.config.Listen)).WithField(
"certificates", fmt.Sprintf("%d", len(cc.Certificates))).Info("server starting")
err = s.web.StartServer(tlsServer)
if err != nil {
return errors.Wrap(err, "cannot start server")
}
} else {
log.WithField("listen", fmt.Sprintf("http://%s", s.config.Listen)).Warn("server starting without TLS")
err = s.web.Start(s.config.Listen)
}
if err != nil {
return errors.Wrap(err, "cannot start server")
}
return nil
}
func (s *Server) initApi() {
s.web.Use(RecoverHandler(Log.Data))
s.web.HTTPErrorHandler = errorHandler
s.web.Use(RequestLogger(Log.Data))
s.web.Use(middleware.BodyLimit("1M"))
g := s.web.Group("/v1")
s.signapi.RegisterRoutes(g)
s.web.GET("/version", handleVersion)
}
func Build() (*Server, error) {
// Configuration
tmp, err := config.Get("server")
if err != nil {
return nil, errors.Wrap(err, "cannot initialize server")
}
conf, _ := tmp.(*Config)
if conf == nil {
return nil, errors.New("cannot initialize server. Invalid configuration")
}
maxlife, err := time.ParseDuration(conf.MaxCertLifetime)
if err != nil {
return nil, errors.Wrap(err, "invalid MaxCertLifeTime")
}
defaultlife, err := time.ParseDuration(conf.DefaultCertLifetime)
if err != nil {
return nil, errors.Wrap(err, "invalid DefaultCertLifetime")
}
caChallengeLife, err := time.ParseDuration(conf.CaChallengeLifetime)
if err != nil {
return nil, errors.Wrap(err, "invalid CaChallengeLifetime")
}
// Auth backends
authList := []signapi.AuthenticatorListEntry{}
for _, ab := range conf.AuthBackends {
instance, err := authbackend.GetBackend(ab.Type, ab.Config)
if err != nil {
return nil, errors.Wrap(err, "cannot initialize server")
}
authList = append(authList, signapi.AuthenticatorListEntry{
Authenticator: instance,
Default: ab.Default,
})
}
signer := keysigner.New(conf.AgentSocket, conf.CertSigningKeyFingerprint)
for i := 0; i < 3; i++ {
if signer.AgentPing() {
break
}
time.Sleep(50 * time.Millisecond)
}
// Setup PKCS11 if required
if conf.PKCS11Provider != "" && conf.PKCS11Pin != "" {
// Try to readd (NitroKey issue)
if err = signer.RemoveSmartcard(conf.PKCS11Provider); err != nil {
return nil, errors.Wrap(err, "pkcs11 initialize error")
}
if err := signer.AddSmartcard(conf.PKCS11Provider, conf.PKCS11Pin); err != nil {
return nil, errors.Wrap(err, "pkcs11 initialize error")
}
}
// Generate random jwt token signing key in case none is set
if conf.TokenSigningKey == "" {
Log.Info("generating random JWT token signing key as none is set")
conf.TokenSigningKey = util.RandB64(256)
}
// Signing API
signapi := signapi.New(authList, signer, []byte(conf.TokenSigningKey), defaultlife, maxlife, caChallengeLife)
s := &Server{
config: conf,
web: echo.New(),
signapi: signapi,
}
s.initApi()
return s, nil
}
func handleVersion(c echo.Context) error {
return c.String(http.StatusOK, fmt.Sprint(globals.Version()))
}
// Simplified version of the standard echo's errorhandler
func errorHandler(err error, c echo.Context) {
var (
code = http.StatusInternalServerError
msg interface{}
)
if he, ok := err.(*echo.HTTPError); ok {
code = he.Code
msg = he.Message
} else {
msg = http.StatusText(code)
}
if !c.Response().Committed {
var rErr error
if c.Request().Method == echo.HEAD { // Issue #608
rErr = c.NoContent(code)
} else {
rErr = c.String(code, fmt.Sprintf("%s", msg))
}
if rErr != nil {
Log.WithError(rErr).Warn("error sending error response")
}
}
}
// Simplified version of the echo's recover handler with support for logrus logging
func RecoverHandler(lf logrus.Fields) echo.MiddlewareFunc {
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
defer func() {
if r := recover(); r != nil {
var err error
log := Log.WithFields(lf)
switch r := r.(type) {
case error:
err = r
default:
err = fmt.Errorf("%v", r)
}
stack := make([]byte, 4<<10)
length := runtime.Stack(stack, false)
log.WithError(err).WithField("stack", string(stack[:length])).Error("PANIC RECOVER")
c.Error(err)
}
}()
return next(c)
}
}
}