GEANTLink/lib/EapHost/include/Credentials.h

/*
    Copyright 2015-2016 Amebis
    Copyright 2016 GÉANT

    This file is part of GÉANTLink.

    GÉANTLink 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 3 of the License, or
    (at your option) any later version.

    GÉANTLink is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with GÉANTLink. If not, see <http://www.gnu.org/licenses/>.
*/

#include <sal.h>

namespace eap
{
    ///
    /// EapHost peer method credentials
    ///
    class credentials_eaphost;
}

#pragma once

#include "Config.h"

#include "../../EAPBase/include/Credentials.h"

#include <WinStd/Crypt.h>

#include <Windows.h>
#include <vector>


namespace eap
{
    class credentials_eaphost : public credentials
    {
    public:
        ///
        /// Constructs credentials
        ///
        /// \param[in] mod  EAP module to use for global services
        ///
        credentials_eaphost(_In_ module &mod);

        ///
        /// Copies credentials
        ///
        /// \param[in] other  Credentials to copy from
        ///
        credentials_eaphost(_In_ const credentials_eaphost &other);

        ///
        /// Moves credentials
        ///
        /// \param[in] other  Credentials to move from
        ///
        credentials_eaphost(_Inout_ credentials_eaphost &&other);

        ///
        /// Copies credentials
        ///
        /// \param[in] other  Credentials to copy from
        ///
        /// \returns Reference to this object
        ///
        credentials_eaphost& operator=(_In_ const credentials_eaphost &other);

        ///
        /// Moves credentials
        ///
        /// \param[in] other  Credentials to move from
        ///
        /// \returns Reference to this object
        ///
        credentials_eaphost& operator=(_Inout_ credentials_eaphost &&other);

        ///
        /// Clones credentials
        ///
        /// \returns Pointer to cloned credentials
        ///
        virtual config* clone() const;

        ///
        /// Resets credentials
        ///
        virtual void clear();

        ///
        /// Test credentials if blank
        ///
        /// \returns
        /// - \c true if blank
        /// - \c false otherwise
        ///
        virtual bool empty() const;

        /// \name XML credentials management
        /// @{

        ///
        /// Save to XML document
        ///
        /// \param[in]  pDoc         XML document
        /// \param[in]  pConfigRoot  Suggested root element for saving
        ///
        virtual void save(_In_ IXMLDOMDocument *pDoc, _In_ IXMLDOMNode *pConfigRoot) const;

        ///
        /// Load from XML document
        ///
        /// \param[in]  pConfigRoot  Root element for loading
        ///
        virtual void load(_In_ IXMLDOMNode *pConfigRoot);

        /// @}

        /// \name BLOB management
        /// @{

        ///
        /// Packs a configuration
        ///
        /// \param[inout] cursor  Memory cursor
        ///
        virtual void operator<<(_Inout_ cursor_out &cursor) const;

        ///
        /// Returns packed size of a configuration
        ///
        /// \returns Size of data when packed (in bytes)
        ///
        virtual size_t get_pk_size() const;

        ///
        /// Unpacks a configuration
        ///
        /// \param[inout] cursor  Memory cursor
        ///
        virtual void operator>>(_Inout_ cursor_in &cursor);

        /// @}

        /// \name Storage
        /// @{

        ///
        /// Save credentials to Windows Credential Manager
        ///
        /// \param[in]  pszTargetName  The name in Windows Credential Manager to store credentials as
        /// \param[in]  level          Credential level (0=outer, 1=inner, 2=inner-inner...)
        ///
        virtual void store(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level) const;

        ///
        /// Retrieve credentials from Windows Credential Manager
        ///
        /// \param[in]  pszTargetName  The name in Windows Credential Manager to retrieve credentials from
        /// \param[in]  level          Credential level (0=outer, 1=inner, 2=inner-inner...)
        ///
        virtual void retrieve(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level);

        ///
        /// Return target suffix for Windows Credential Manager credential name
        ///
        virtual LPCTSTR target_suffix() const;

        /// @}

        ///
        /// Combine credentials in the following order:
        ///
        /// 1. Cached credentials
        /// 2. Configured credentials (if \p cfg is derived from config_method_with_cred)
        /// 3. Stored credentials
        ///
        /// \param[in] dwFlags                A combination of [EAP flags](https://msdn.microsoft.com/en-us/library/windows/desktop/bb891975.aspx) that describe the EAP authentication session behavior
        /// \param[in] hTokenImpersonateUser  Impersonation token for a logged-on user to collect user-related information
        /// \param[in] cred_cached            Cached credentials (optional, can be \c NULL, must be credentials_eaphost* type)
        /// \param[in] cfg                    Method configuration (unused, as must be as config_method_eaphost is not derived from config_method_with_cred)
        /// \param[in] pszTargetName          The name in Windows Credential Manager to retrieve credentials from (optional, can be \c NULL)
        ///
        /// \returns
        /// - \c source_cache   Credentials were obtained from EapHost cache
        /// - \c source_config  Credentials were set by method configuration
        /// - \c source_storage Credentials were loaded from Windows Credential Manager
        ///
        virtual source_t combine(
            _In_             DWORD         dwFlags,
            _In_             HANDLE        hTokenImpersonateUser,
            _In_opt_   const credentials   *cred_cached,
            _In_       const config_method &cfg,
            _In_opt_z_       LPCTSTR       pszTargetName);

    public:
        sanitizing_blob m_cred_blob;    ///< Credentials BLOB

    private:
        /// \cond internal
        static const unsigned char s_entropy[1024];
        /// \endcond
    };
}