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SAML authentication feature in Velociraptor (Velocidex#62)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| _ "fmt" | ||
| "github.com/crewjam/saml/samlsp" | ||
| "github.com/sirupsen/logrus" | ||
| "net/http" | ||
| "net/url" | ||
| api_proto "www.velocidex.com/golang/velociraptor/api/proto" | ||
| config_proto "www.velocidex.com/golang/velociraptor/config/proto" | ||
| "www.velocidex.com/golang/velociraptor/crypto" | ||
| "www.velocidex.com/golang/velociraptor/logging" | ||
| "www.velocidex.com/golang/velociraptor/users" | ||
| ) | ||
|
|
||
| var samlMiddleware *samlsp.Middleware | ||
|
|
||
| func MaybeAddSAMLHandlers(config_obj *config_proto.Config, mux *http.ServeMux) error { | ||
| if SAMLEnabled(config_obj) { | ||
| key, err := crypto.ParseRsaPrivateKeyFromPemStr([]byte(config_obj.GUI.SamlPrivateKey)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| cert, err := crypto.ParseX509CertFromPemStr([]byte(config_obj.GUI.SamlCertificate)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| idpMetadataURL, err := url.Parse(config_obj.GUI.SamlIdpMetadataUrl) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| rootURL, err := url.Parse(config_obj.GUI.SamlRootUrl) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| samlMiddleware, _ = samlsp.New(samlsp.Options{ | ||
| IDPMetadataURL: idpMetadataURL, | ||
| URL: *rootURL, | ||
| Key: key, | ||
| Certificate: cert, | ||
| }) | ||
| mux.Handle("/saml/", samlMiddleware) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func userAttr(config_obj *config_proto.Config) string { | ||
| if config_obj.GUI.SamlUserAttribute == "" { | ||
| return "name" | ||
| } | ||
| return config_obj.GUI.SamlUserAttribute | ||
| } | ||
|
|
||
| func SAMLEnabled(config_obj *config_proto.Config) bool { | ||
| return config_obj.GUI.SamlCertificate != "" && config_obj.GUI.SamlPrivateKey != "" && | ||
| config_obj.GUI.SamlIdpMetadataUrl != "" && config_obj.GUI.SamlRootUrl != "" | ||
| } | ||
|
|
||
| func authenticateSAML(config_obj *config_proto.Config, parent http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| if token := samlMiddleware.GetAuthorizationToken(r); token != nil { | ||
|
|
||
| username := token.Attributes.Get(userAttr(config_obj)) | ||
| user_record, err := users.GetUser(config_obj, username) | ||
| if err != nil || user_record.Locked || user_record.Name != username { | ||
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | ||
| w.WriteHeader(http.StatusUnauthorized) | ||
|
|
||
| fmt.Fprintf(w, ` | ||
| <html><body> | ||
| Authorization failed. You are not registered on this system as %v. | ||
| Contact your system administrator to get an account, then try again. | ||
| </body></html> | ||
| `, username) | ||
|
|
||
| logging.GetLogger(config_obj, &logging.Audit). | ||
| WithFields(logrus.Fields{ | ||
| "user": username, | ||
| "remote": r.RemoteAddr, | ||
| "method": r.Method, | ||
| }).Error("User rejected by GUI") | ||
|
|
||
| return | ||
| } | ||
|
|
||
| user_info := &api_proto.VelociraptorUser{ | ||
| Name: username, | ||
| } | ||
|
|
||
| serialized, _ := json.Marshal(user_info) | ||
| ctx := context.WithValue( | ||
| r.Context(), "USER", string(serialized)) | ||
| GetLoggingHandler(config_obj)(parent).ServeHTTP( | ||
| w, r.WithContext(ctx)) | ||
| return | ||
| } | ||
| samlMiddleware.RequireAccountHandler(w, r) | ||
| }) | ||
| } |
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