/usr/include/lasso/xml/saml-2.0/ is in liblasso3-dev 2.5.0-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/lasso/xml/saml-2.0/saml2_action.h
/usr/include/lasso/xml/saml-2.0/saml2_advice.h
/usr/include/lasso/xml/saml-2.0/saml2_assertion.h
/usr/include/lasso/xml/saml-2.0/saml2_attribute.h
/usr/include/lasso/xml/saml-2.0/saml2_attribute_statement.h
/usr/include/lasso/xml/saml-2.0/saml2_attribute_value.h
/usr/include/lasso/xml/saml-2.0/saml2_audience_restriction.h
/usr/include/lasso/xml/saml-2.0/saml2_authn_context.h
/usr/include/lasso/xml/saml-2.0/saml2_authn_statement.h
/usr/include/lasso/xml/saml-2.0/saml2_authz_decision_statement.h
/usr/include/lasso/xml/saml-2.0/saml2_base_idabstract.h
/usr/include/lasso/xml/saml-2.0/saml2_condition_abstract.h
/usr/include/lasso/xml/saml-2.0/saml2_conditions.h
/usr/include/lasso/xml/saml-2.0/saml2_encrypted_element.h
/usr/include/lasso/xml/saml-2.0/saml2_evidence.h
/usr/include/lasso/xml/saml-2.0/saml2_key_info_confirmation_data.h
/usr/include/lasso/xml/saml-2.0/saml2_key_info_confirmation_data_type.h
/usr/include/lasso/xml/saml-2.0/saml2_name_id.h
/usr/include/lasso/xml/saml-2.0/saml2_one_time_use.h
/usr/include/lasso/xml/saml-2.0/saml2_proxy_restriction.h
/usr/include/lasso/xml/saml-2.0/saml2_statement_abstract.h
/usr/include/lasso/xml/saml-2.0/saml2_strings.h
/usr/include/lasso/xml/saml-2.0/saml2_subject.h
/usr/include/lasso/xml/saml-2.0/saml2_subject_confirmation.h
/usr/include/lasso/xml/saml-2.0/saml2_subject_confirmation_data.h
/usr/include/lasso/xml/saml-2.0/saml2_subject_locality.h
/usr/include/lasso/xml/saml-2.0/saml2_xsd.h
/usr/include/lasso/xml/saml-2.0/samlp2_artifact_resolve.h
/usr/include/lasso/xml/saml-2.0/samlp2_artifact_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_assertion_id_request.h
/usr/include/lasso/xml/saml-2.0/samlp2_attribute_query.h
/usr/include/lasso/xml/saml-2.0/samlp2_authn_query.h
/usr/include/lasso/xml/saml-2.0/samlp2_authn_request.h
/usr/include/lasso/xml/saml-2.0/samlp2_authz_decision_query.h
/usr/include/lasso/xml/saml-2.0/samlp2_extensions.h
/usr/include/lasso/xml/saml-2.0/samlp2_idp_entry.h
/usr/include/lasso/xml/saml-2.0/samlp2_idp_list.h
/usr/include/lasso/xml/saml-2.0/samlp2_logout_request.h
/usr/include/lasso/xml/saml-2.0/samlp2_logout_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_manage_name_id_request.h
/usr/include/lasso/xml/saml-2.0/samlp2_manage_name_id_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_name_id_mapping_request.h
/usr/include/lasso/xml/saml-2.0/samlp2_name_id_mapping_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_name_id_policy.h
/usr/include/lasso/xml/saml-2.0/samlp2_request_abstract.h
/usr/include/lasso/xml/saml-2.0/samlp2_requested_authn_context.h
/usr/include/lasso/xml/saml-2.0/samlp2_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_scoping.h
/usr/include/lasso/xml/saml-2.0/samlp2_status.h
/usr/include/lasso/xml/saml-2.0/samlp2_status_code.h
/usr/include/lasso/xml/saml-2.0/samlp2_status_detail.h
/usr/include/lasso/xml/saml-2.0/samlp2_status_response.h
/usr/include/lasso/xml/saml-2.0/samlp2_subject_query_abstract.h
/usr/include/lasso/xml/saml-2.0/samlp2_terminate.h