131 lines
3.1 KiB
Go
131 lines
3.1 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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"golang.org/x/sync/singleflight"
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)
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const (
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typeNameBasic = "BasicAuth"
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)
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type basicAuth struct {
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next http.Handler
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auth *goauth.BasicAuth
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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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checkSecret func(password, secret string) bool
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singleflightGroup *singleflight.Group
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}
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// NewBasic creates a basicAuth middleware.
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func NewBasic(ctx context.Context, next http.Handler, authConfig dynamic.BasicAuth, name string) (http.Handler, error) {
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middlewares.GetLogger(ctx, name, typeNameBasic).Debug().Msg("Creating middleware")
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users, err := getUsers(authConfig.UsersFile, authConfig.Users, basicUserParser)
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if err != nil {
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return nil, err
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}
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ba := &basicAuth{
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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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checkSecret: goauth.CheckSecret,
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singleflightGroup: new(singleflight.Group),
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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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ba.auth = &goauth.BasicAuth{Realm: realm, Secrets: ba.secretBasic}
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return ba, nil
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}
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func (b *basicAuth) GetTracingInformation() (string, string, trace.SpanKind) {
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return b.name, typeNameBasic, trace.SpanKindInternal
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}
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func (b *basicAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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logger := middlewares.GetLogger(req.Context(), b.name, typeNameBasic)
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user, password, ok := req.BasicAuth()
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if ok {
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ok = b.checkPassword(user, password)
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}
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logData := accesslog.GetLogData(req)
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if logData != nil {
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logData.Core[accesslog.ClientUsername] = user
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}
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if !ok {
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logger.Debug().Msg("Authentication failed")
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observability.SetStatusErrorf(req.Context(), "Authentication failed")
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b.auth.RequireAuth(rw, req)
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return
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}
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logger.Debug().Msg("Authentication succeeded")
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req.URL.User = url.User(user)
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if b.headerField != "" {
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req.Header[b.headerField] = []string{user}
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}
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if b.removeHeader {
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logger.Debug().Msg("Removing authorization header")
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req.Header.Del(authorizationHeader)
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}
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b.next.ServeHTTP(rw, req)
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}
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func (b *basicAuth) checkPassword(user, password string) bool {
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secret := b.auth.Secrets(user, b.auth.Realm)
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if secret == "" {
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return false
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}
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key := password + secret
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match, _, _ := b.singleflightGroup.Do(key, func() (any, error) {
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return b.checkSecret(password, secret), nil
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})
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return match.(bool)
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}
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func (b *basicAuth) secretBasic(user, realm string) string {
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if secret, ok := b.users[user]; 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 basicUserParser(user string) (string, string, error) {
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split := strings.Split(user, ":")
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if len(split) != 2 {
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return "", "", fmt.Errorf("error parsing BasicUser: %v", user)
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}
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return split[0], split[1], nil
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}
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