/usr/include/qgis/qgsauthimportcertdialog.h is in libqgis-dev 2.18.17+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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    qgsauthimportcertdialog.h
    ---------------------
    begin                : April 30, 2015
    copyright            : (C) 2015 by Boundless Spatial, Inc. USA
    author               : Larry Shaffer
    email                : lshaffer at boundlessgeo dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSAUTHIMPORTCERTDIALOG_H
#define QGSAUTHIMPORTCERTDIALOG_H
#include <QDialog>
#include "ui_qgsauthimportcertdialog.h"
#include "qgsauthcertutils.h"
#include <QSslCertificate>
class QPushButton;
/** \ingroup gui
 * Widget for importing a certificate into the authentication database
 */
class GUI_EXPORT QgsAuthImportCertDialog : public QDialog, private Ui::QgsAuthImportCertDialog
{
    Q_OBJECT
  public:
    /** Type of filter to apply to dialog */
    enum CertFilter
    {
      NoFilter = 1,
      CaFilter = 2,
    };
    /** Type of inputs for certificates */
    enum CertInput
    {
      AllInputs = 1,
      FileInput = 2,
      TextInput = 3,
    };
    /**
     * Construct a dialog for importing certificates
     * @param parent Parent widget
     * @param filter Certificate type filter to apply to dialog
     * @param input Type of input(s) for certificates
     */
    explicit QgsAuthImportCertDialog( QWidget *parent = nullptr,
                                      QgsAuthImportCertDialog::CertFilter filter = NoFilter,
                                      QgsAuthImportCertDialog::CertInput input = AllInputs );
    ~QgsAuthImportCertDialog();
    /** Get list of certificate objects to import */
    const QList<QSslCertificate> certificatesToImport();
    /** Get the file path to a certificate to import */
    const QString certFileToImport();
    /** Get certificate text to import */
    const QString certTextToImport();
    /** Whether to allow importation of invalid certificates (so trust policy can be overridden) */
    bool allowInvalidCerts();
    /** Defined trust policy for imported certificates */
    QgsAuthCertUtils::CertTrustPolicy certTrustPolicy();
  private slots:
    void updateGui();
    void validateCertificates();
    void on_btnImportFile_clicked();
    void on_chkAllowInvalid_toggled( bool checked );
  private:
    QString getOpenFileName( const QString& title, const QString& extfilter );
    QPushButton* okButton();
    QList<QSslCertificate> mCerts;
    QgsAuthImportCertDialog::CertFilter mFilter;
    QgsAuthImportCertDialog::CertInput mInput;
    bool mDisabled;
    QVBoxLayout *mAuthNotifyLayout;
    QLabel *mAuthNotify;
};
#endif // QGSAUTHIMPORTCERTDIALOG_H
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