126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
package auth
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import (
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"context"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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goauth "github.com/abbot/go-http-auth"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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"github.com/traefik/traefik/v3/pkg/middlewares"
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"github.com/traefik/traefik/v3/pkg/middlewares/accesslog"
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"github.com/traefik/traefik/v3/pkg/middlewares/observability"
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"go.opentelemetry.io/otel/trace"
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)
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const (
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typeNameDigest = "digestAuth"
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)
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type digestAuth struct {
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next http.Handler
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auth *goauth.DigestAuth
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users map[string]string
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headerField string
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removeHeader bool
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name string
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}
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// NewDigest creates a digest auth middleware.
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func NewDigest(ctx context.Context, next http.Handler, authConfig dynamic.DigestAuth, name string) (http.Handler, error) {
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middlewares.GetLogger(ctx, name, typeNameDigest).Debug().Msg("Creating middleware")
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users, err := getUsers(authConfig.UsersFile, authConfig.Users, digestUserParser)
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if err != nil {
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return nil, err
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}
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da := &digestAuth{
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next: next,
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users: users,
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headerField: authConfig.HeaderField,
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removeHeader: authConfig.RemoveHeader,
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name: name,
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}
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realm := defaultRealm
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if len(authConfig.Realm) > 0 {
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realm = authConfig.Realm
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}
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da.auth = goauth.NewDigestAuthenticator(realm, da.secretDigest)
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return da, nil
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}
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func (d *digestAuth) GetTracingInformation() (string, string, trace.SpanKind) {
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return d.name, typeNameDigest, trace.SpanKindInternal
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}
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func (d *digestAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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logger := middlewares.GetLogger(req.Context(), d.name, typeNameDigest)
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username, authinfo := d.auth.CheckAuth(req)
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if username == "" {
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headerField := d.headerField
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if d.headerField == "" {
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headerField = "Authorization"
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}
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auth := goauth.DigestAuthParams(req.Header.Get(headerField))
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if auth["username"] != "" {
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logData := accesslog.GetLogData(req)
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if logData != nil {
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logData.Core[accesslog.ClientUsername] = auth["username"]
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}
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}
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if authinfo != nil && *authinfo == "stale" {
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logger.Debug().Msg("Digest authentication failed, possibly because out of order requests")
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observability.SetStatusErrorf(req.Context(), "Digest authentication failed, possibly because out of order requests")
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d.auth.RequireAuthStale(rw, req)
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return
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}
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logger.Debug().Msg("Digest authentication failed")
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observability.SetStatusErrorf(req.Context(), "Digest authentication failed")
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d.auth.RequireAuth(rw, req)
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return
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}
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logger.Debug().Msg("Digest authentication succeeded")
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req.URL.User = url.User(username)
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logData := accesslog.GetLogData(req)
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if logData != nil {
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logData.Core[accesslog.ClientUsername] = username
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}
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if d.headerField != "" {
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req.Header[d.headerField] = []string{username}
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}
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if d.removeHeader {
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logger.Debug().Msg("Removing the Authorization header")
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req.Header.Del(authorizationHeader)
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}
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d.next.ServeHTTP(rw, req)
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}
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func (d *digestAuth) secretDigest(user, realm string) string {
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if secret, ok := d.users[user+":"+realm]; ok {
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return secret
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}
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return ""
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}
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func digestUserParser(user string) (string, string, error) {
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split := strings.Split(user, ":")
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if len(split) != 3 {
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return "", "", fmt.Errorf("error parsing DigestUser: %v", user)
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}
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return split[0] + ":" + split[1], split[2], nil
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}
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