ssl_cert.c

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/*
 * Copyright 2016 Vincent Sanders <vince@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 * Implementation of win32 certificate viewing using nsw32 core windows.
 */

#include <stdint.h>
#include <stdlib.h>
#include <windows.h>

#include "utils/log.h"
#include "utils/nsoption.h"
#include "netsurf/keypress.h"
#include "netsurf/plotters.h"
#include "desktop/sslcert_viewer.h"

#include "windows/windbg.h"
#include "windows/plot.h"
#include "windows/corewindow.h"
#include "windows/gui.h"
#include "windows/resourceid.h"
#include "windows/ssl_cert.h"

/* spacing and sizes for dialog elements from
 * https://msdn.microsoft.com/en-us/library/windows/desktop/dn742486(v=vs.85).aspx#sizingandspacing
 */
/** dialog margin */
#define DLG_MRGN 11
/** warning icon height */
#define WRN_ICO_H 32
/** comand button width */
#define CMD_BTN_W 75
/** command button height */
#define CMD_BTN_H 23

static const char windowclassname_sslcert[] = "nswssslcertwindow";

/** win32 ssl certificate view context */
struct nsw32_sslcert_window {
        struct nsw32_corewindow core;

        /** SSL certificate viewer context data */
        struct sslcert_session_data *ssl_data;

        /** dialog window handle */
        HWND hWnd;

        /** accept button handle */
        HWND hAccept;

        /** reject button handle */
        HWND hReject;

        /** warning text  handle */
        HWND hTxt;
};


/**
 * callback for keypress on ssl certificate window
 *
 * \param nsw32_cw The nsw32 core window structure.
 * \param nskey The netsurf key code
 * \return NSERROR_OK on success otherwise appropriate error code
 */
static nserror
nsw32_sslcert_viewer_key(struct nsw32_corewindow *nsw32_cw, uint32_t nskey)
{
        struct nsw32_sslcert_window *crtvrfy_win;

        /* technically degenerate container of */
        crtvrfy_win = (struct nsw32_sslcert_window *)nsw32_cw;

        if (sslcert_viewer_keypress(crtvrfy_win->ssl_data, nskey)) {
                return NSERROR_OK;
        }
        return NSERROR_NOT_IMPLEMENTED;
}


/**
 * callback for mouse action on ssl certificate window
 *
 * \param nsw32_cw The nsw32 core window structure.
 * \param mouse_state netsurf mouse state on event
 * \param x location of event
 * \param y location of event
 * \return NSERROR_OK on success otherwise appropriate error code
 */
static nserror
nsw32_sslcert_viewer_mouse(struct nsw32_corewindow *nsw32_cw,
                           browser_mouse_state mouse_state,
                           int x, int y)
{
        struct nsw32_sslcert_window *crtvrfy_win;

        /* technically degenerate container of */
        crtvrfy_win = (struct nsw32_sslcert_window *)nsw32_cw;

        sslcert_viewer_mouse_action(crtvrfy_win->ssl_data, mouse_state, x, y);

        return NSERROR_OK;
}


/**
 * callback on draw event for ssl certificate window
 *
 * \param nsw32_cw The nsw32 core window structure.
 * \param scrollx The horizontal scroll offset.
 * \param scrolly The vertical scroll offset.
 * \param r The rectangle of the window that needs updating.
 * \return NSERROR_OK on success otherwise appropriate error code
 */
static nserror
nsw32_sslcert_viewer_draw(struct nsw32_corewindow *nsw32_cw,
                          int scrollx,
                          int scrolly,
                          struct rect *r)
{
        struct nsw32_sslcert_window *crtvrfy_win;
        struct redraw_context ctx = {
                .interactive = true,
                .background_images = true,
                .plot = &win_plotters
        };

        /* technically degenerate container of */
        crtvrfy_win = (struct nsw32_sslcert_window *)nsw32_cw;

        sslcert_viewer_redraw(crtvrfy_win->ssl_data,
                              -scrollx, -scrolly,
                              r, &ctx);

        return NSERROR_OK;
}


/**
 * callback on close event for ssl certificate window
 *
 * \param nsw32_cw The nsw32 core window structure.
 * \return NSERROR_OK on success otherwise appropriate error code
 */
static nserror
nsw32_sslcert_viewer_close(struct nsw32_corewindow *nsw32_cw)
{
        DestroyWindow(nsw32_cw->hWnd);

        return NSERROR_OK;
}


/* exported interface documented in nsw32/ssl_cert.h */
nserror nsw32_cert_verify(struct nsurl *url,
                          const struct cert_chain *chain,
                          nserror (*cb)(bool proceed, void *pw),
                          void *cbpw)
{
        struct nsw32_sslcert_window *ncwin;
        nserror res;

        ncwin = malloc(sizeof(struct nsw32_sslcert_window));
        if (ncwin == NULL) {
                return NSERROR_NOMEM;
        }

        /* initialise certificate viewing interface */
        res = sslcert_viewer_create_session_data(url, cb, cbpw, chain, &ncwin->ssl_data);
        if (res != NSERROR_OK) {
                free(ncwin);
                return res;
        }

        NSLOG(netsurf, INFO, "creating hInstance %p SSL window", hinst);
        ncwin->hWnd = CreateWindowEx(0,
                                     windowclassname_sslcert,
                                     "SSL Certificate viewer",
                                     WS_OVERLAPPEDWINDOW |
                                     WS_CLIPSIBLINGS |
                                     WS_CLIPCHILDREN |
                                     CS_DBLCLKS,
                                     CW_USEDEFAULT,
                                     CW_USEDEFAULT,
                                     500,
                                     400,
                                     NULL,
                                     NULL,
                                     hinst,
                                     NULL);
        if (ncwin->hWnd == NULL) {
                NSLOG(netsurf, INFO, "Window create failed");
                return NSERROR_NOMEM;
        }

        ncwin->core.title = NULL;
        ncwin->core.draw = nsw32_sslcert_viewer_draw;
        ncwin->core.key = nsw32_sslcert_viewer_key;
        ncwin->core.mouse = nsw32_sslcert_viewer_mouse;
        ncwin->core.close = nsw32_sslcert_viewer_close;

        res = nsw32_corewindow_init(hinst, ncwin->hWnd, &ncwin->core);
        if (res != NSERROR_OK) {
                free(ncwin);
                return res;
        }

        res = sslcert_viewer_init(ncwin->core.cb_table,
                                  (struct core_window *)ncwin,
                                  ncwin->ssl_data);
        if (res != NSERROR_OK) {
                free(ncwin);
                return res;
        }

        ncwin->hAccept = CreateWindowEx(0,
                                        "BUTTON",
                                        "Accept",
                                        WS_TABSTOP|WS_VISIBLE|
                                        WS_CHILD|BS_DEFPUSHBUTTON,
                                        CW_USEDEFAULT,
                                        CW_USEDEFAULT,
                                        CMD_BTN_W,
                                        CMD_BTN_H,
                                        ncwin->hWnd,
                                        (HMENU)IDC_SSLCERT_BTN_ACCEPT,
                                        hinst,
                                        NULL);
        HGDIOBJ hfDefault=GetStockObject(DEFAULT_GUI_FONT);
        SendMessage(ncwin->hAccept, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE,0));
        ncwin->hReject = CreateWindowEx(0,
                                        "BUTTON",
                                        "Reject",
                                        WS_TABSTOP|WS_VISIBLE|
                                        WS_CHILD|BS_DEFPUSHBUTTON,
                                        CW_USEDEFAULT,
                                        CW_USEDEFAULT,
                                        CMD_BTN_W,
                                        CMD_BTN_H,
                                        ncwin->hWnd,
                                        (HMENU)IDC_SSLCERT_BTN_REJECT,
                                        hinst,
                                        NULL);
        SendMessage(ncwin->hReject, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE,0));

        CreateWindowEx(0,
                       "STATIC",
                       IDI_WARNING,
                       WS_VISIBLE | WS_CHILD | SS_ICON,
                       DLG_MRGN,
                       DLG_MRGN,
                       CMD_BTN_W,
                       CMD_BTN_H,
                       ncwin->hWnd,
                       NULL,
                       NULL,
                       NULL);
        ncwin->hTxt = CreateWindowEx(0,
                                     "STATIC",
                                     "NetSurf failed to verify the authenticity of an SSL certificate. Verify the certificate details",
                                     WS_VISIBLE | WS_CHILD | SS_LEFT,
                                     DLG_MRGN + WRN_ICO_H + DLG_MRGN,
                                     DLG_MRGN + 5,
                                     400,
                                     WRN_ICO_H - 5,
                                     ncwin->hWnd,
                                     NULL,
                                     NULL,
                                     NULL);
        SendMessage(ncwin->hTxt, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE,0));

        SetProp(ncwin->hWnd, TEXT("CertWnd"), (HANDLE)ncwin);

        ShowWindow(ncwin->hWnd, SW_SHOWNORMAL);

        return NSERROR_OK;
}


/**
 * position and size ssl cert window widgets.
 *
 * \param hwnd The win32 handle of the window
 * \param certwin The certificate viewer context
 */
static void
nsw32_window_ssl_cert_size(HWND hwnd, struct nsw32_sslcert_window *certwin)
{
        RECT rc;
        GetClientRect(hwnd, &rc);
        /* position certificate drawable */
        MoveWindow(certwin->core.hWnd,
                   DLG_MRGN,
                   DLG_MRGN + WRN_ICO_H + DLG_MRGN,
                   rc.right - (DLG_MRGN + DLG_MRGN),
                   rc.bottom - (DLG_MRGN + WRN_ICO_H + DLG_MRGN + DLG_MRGN + CMD_BTN_H + DLG_MRGN),
                   TRUE);
        /* position accept button */
        MoveWindow(certwin->hAccept,
                   rc.right - (DLG_MRGN + CMD_BTN_W),
                   rc.bottom - (DLG_MRGN + CMD_BTN_H),
                   CMD_BTN_W,
                   CMD_BTN_H,
                   TRUE);
        /* position reject button */
        MoveWindow(certwin->hReject,
                   rc.right - (DLG_MRGN + CMD_BTN_W + 7 + CMD_BTN_W),
                   rc.bottom - (DLG_MRGN + CMD_BTN_H),
                   CMD_BTN_W,
                   CMD_BTN_H,
                   TRUE);
        /* position text */
        MoveWindow(certwin->hTxt,
                   DLG_MRGN + WRN_ICO_H + DLG_MRGN,
                   DLG_MRGN + 5,
                   rc.right - (DLG_MRGN + WRN_ICO_H + DLG_MRGN + DLG_MRGN),
                   WRN_ICO_H - 5,
                   TRUE);
}


/**
 * Destroy a certificate viewing window
 *
 * \param crtwin The certificate viewer context
 * \return NSERROR_OK on success otherwise appropriate error code
 */
static nserror nsw32_crtvrfy_destroy(struct nsw32_sslcert_window *crtwin)
{
        nserror res;

        res = sslcert_viewer_fini(crtwin->ssl_data);
        if (res == NSERROR_OK) {
                res = nsw32_corewindow_fini(&crtwin->core);
                DestroyWindow(crtwin->hWnd);
                free(crtwin);
        }
        return res;
}


/**
 * handle command message on ssl certificate viewing window.
 *
 * \param hwnd The win32 window handle.
 * \param crtwin certificate window context.
 * \param notification_code notifiction code
 * \param identifier notification identifier
 * \param ctrl_window The win32 control window handle
 * \return appropriate response for command
 */
static LRESULT
nsw32_window_ssl_cert_command(HWND hwnd,
                              struct nsw32_sslcert_window *crtwin,
                              int notification_code,
                              int identifier,
                              HWND ctrl_window)
{
        NSLOG(netsurf, INFO,
              "notification_code %x identifier %x ctrl_window %p",
              notification_code,
              identifier,
              ctrl_window);

        switch(identifier) {
        case IDC_SSLCERT_BTN_ACCEPT:
                sslcert_viewer_accept(crtwin->ssl_data);
                nsw32_crtvrfy_destroy(crtwin);
                break;

        case IDC_SSLCERT_BTN_REJECT:
                sslcert_viewer_reject(crtwin->ssl_data);
                nsw32_crtvrfy_destroy(crtwin);
                break;

        default:
                return 1; /* unhandled */
        }
        return 0; /* control message handled */
}


/**
 * callback for SSL certificate window win32 events
 *
 * \param hwnd The win32 window handle
 * \param msg The win32 message identifier
 * \param wparam The w win32 parameter
 * \param lparam The l win32 parameter
 */
static LRESULT CALLBACK
nsw32_window_ssl_cert_event_callback(HWND hwnd,
                                     UINT msg,
                                     WPARAM wparam,
                                     LPARAM lparam)
{
        struct nsw32_sslcert_window *crtwin;
        crtwin = GetProp(hwnd, TEXT("CertWnd"));
        if (crtwin != NULL) {
                switch (msg) {
                case WM_SIZE:
                        nsw32_window_ssl_cert_size(hwnd, crtwin);
                        break;

                case WM_COMMAND:
                        if (nsw32_window_ssl_cert_command(hwnd,
                                                          crtwin,
                                                          HIWORD(wparam),
                                                          LOWORD(wparam),
                                                          (HWND)lparam) == 0) {
                                return 0;
                        }
                        break;

                case WM_CLOSE:
                        sslcert_viewer_reject(crtwin->ssl_data);
                        nsw32_crtvrfy_destroy(crtwin);
                        return 0;
                }
        }

        return DefWindowProc(hwnd, msg, wparam, lparam);
}


/* exported interface documented in nsw32/ssl_cert.h */
nserror nsws_create_cert_verify_class(HINSTANCE hInstance)
{
        nserror ret = NSERROR_OK;
        WNDCLASSEX wc;

        /* drawable area */
        wc.cbSize = sizeof(WNDCLASSEX);
        wc.style = 0;
        wc.lpfnWndProc = nsw32_window_ssl_cert_event_callback;
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        wc.hInstance = hInstance;
        wc.hIcon = NULL;
        wc.hCursor = NULL;
        wc.hbrBackground = (HBRUSH)(COLOR_MENU + 1);
        wc.lpszMenuName = NULL;
        wc.lpszClassName = windowclassname_sslcert;
        wc.hIconSm = NULL;

        if (RegisterClassEx(&wc) == 0) {
                win_perror("CertVerifyClass");
                ret = NSERROR_INIT_FAILED;
        }

        return ret;
}