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package auth
import (
"context"
"time"
grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
gitalyauth "gitlab.com/gitlab-org/gitaly/v14/auth"
internalauth "gitlab.com/gitlab-org/gitaly/v14/internal/gitaly/config/auth"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var (
authCount = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "gitaly_authentications_total",
Help: "Counts of of Gitaly request authentication attempts",
},
[]string{"enforced", "status"},
)
)
// StreamServerInterceptor checks for Gitaly bearer tokens.
func StreamServerInterceptor(conf internalauth.Config) grpc.StreamServerInterceptor {
return grpc_auth.StreamServerInterceptor(checkFunc(conf))
}
// UnaryServerInterceptor checks for Gitaly bearer tokens.
func UnaryServerInterceptor(conf internalauth.Config) grpc.UnaryServerInterceptor {
return grpc_auth.UnaryServerInterceptor(checkFunc(conf))
}
func checkFunc(conf internalauth.Config) func(ctx context.Context) (context.Context, error) {
return func(ctx context.Context) (context.Context, error) {
if len(conf.Token) == 0 {
countStatus("server disabled authentication", conf.Transitioning).Inc()
return ctx, nil
}
err := gitalyauth.CheckToken(ctx, conf.Token, time.Now())
switch status.Code(err) {
case codes.OK:
countStatus(okLabel(conf.Transitioning), conf.Transitioning).Inc()
case codes.Unauthenticated:
countStatus("unauthenticated", conf.Transitioning).Inc()
case codes.PermissionDenied:
countStatus("denied", conf.Transitioning).Inc()
default:
countStatus("invalid", conf.Transitioning).Inc()
}
if conf.Transitioning {
err = nil
}
return ctx, err
}
}
func okLabel(transitioning bool) string {
if transitioning {
// This special value is an extra warning sign to administrators that
// authentication is currently not enforced.
return "would be ok"
}
return "ok"
}
func countStatus(status string, transitioning bool) prometheus.Counter {
enforced := "true"
if transitioning {
enforced = "false"
}
return authCount.WithLabelValues(enforced, status)
}
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