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openvpn-gui/pkcs11.c

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/*
* OpenVPN-GUI -- A Windows GUI for OpenVPN.
*
* Copyright (C) 2022 Selva Nair <selva.nair@gmail.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.
*
* This program 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <windows.h>
#include "pkcs11.h"
#include "options.h"
#include "main.h"
#include "manage.h"
#include "openvpn.h"
#include "misc.h"
#include "openvpn-gui-res.h"
#include "localization.h"
#include <commctrl.h>
#include <cryptuiapi.h>
#include <shlwapi.h>
extern options_t o;
static const wchar_t *hfontProp = L"header_font";
/* state of list array */
#define STATE_GET_COUNT 1
#define STATE_GET_ENTRY 2
#define STATE_FILLED 4
#define STATE_SELECTED 8
struct cert_info
{
wchar_t *commonname;
wchar_t *issuer;
wchar_t *notAfter;
const CERT_CONTEXT *ctx;
};
struct pkcs11_entry
{
char *id; /* pkcs11-id string value as received from daemon */
struct cert_info cert; /* decoded certificate structure */
};
static void
certificate_free(struct cert_info *cert)
{
if (cert)
{
free(cert->commonname);
free(cert->issuer);
free(cert->notAfter);
CertFreeCertificateContext(cert->ctx);
}
}
static bool
pkcs11_list_alloc(struct pkcs11_list *l)
{
if (l->count > 0 && !l->pe)
{
l->pe = calloc(l->count, sizeof(struct pkcs11_entry));
}
return (l->pe != NULL);
}
static void
pkcs11_entry_free(struct pkcs11_entry *pe)
{
if (!pe)
{
return;
}
free(pe->id);
certificate_free(&pe->cert);
}
/* Free any allocated memory and clear the list */
void
pkcs11_list_clear(struct pkcs11_list *l)
{
if (l->pe)
{
for (UINT i = 0; i < l->count; i++)
{
pkcs11_entry_free(&l->pe[i]);
}
free(l->pe);
}
CLEAR(*l);
}
/* Get the "friendly name" (usually the commonname) from a certificate
* context. If issuer = true, the issuer name is parsed, else the
* subject. A newly allocated wide char string is returned.
*/
static wchar_t *
extract_name_entry(const CERT_CONTEXT *ctx, bool issuer)
{
DWORD size = CertGetNameStringW(ctx, CERT_NAME_FRIENDLY_DISPLAY_TYPE,
issuer ? CERT_NAME_ISSUER_FLAG : 0, NULL, NULL, 0);
wchar_t *name = malloc(size*sizeof(wchar_t));
if (name)
{
size = CertGetNameStringW(ctx, CERT_NAME_FRIENDLY_DISPLAY_TYPE,
issuer ? CERT_NAME_ISSUER_FLAG : 0, NULL, name, size);
}
return name;
}
/* Decode a base64 encoded certificate blob and fill in
* the cert structure with commonname, issuer and validity.
* Returns false on error.
*/
static bool
decode_certificate(struct cert_info *cert, const char *b64)
{
unsigned char *der = NULL;
bool ret = false;
int len = Base64Decode(b64, (char **) &der);
if (len < 0)
{
goto out;
}
const CERT_CONTEXT *ctx =
CertCreateCertificateContext(X509_ASN_ENCODING, der, (DWORD) len);
if (!ctx)
{
goto out;
}
cert->commonname = extract_name_entry(ctx, 0);
cert->issuer = extract_name_entry(ctx, CERT_NAME_ISSUER_FLAG);
cert->notAfter = LocalizedFileTime(&ctx->pCertInfo->NotAfter);
cert->ctx = ctx;
ret = true;
out:
free(der);
return ret;
}
/* Parse pkcs11-id message "'n', ID:'<id>', BLOB:'<cert>'"
* and fill in data in pkcs11 enrty.
* Returns index of the item on success, -1 on error.
* On success, caller must free the entry after use.
*/
static UINT
pkcs11_entry_parse(const char *data, struct pkcs11_list *l)
{
char *token = NULL;
UINT index = (UINT) -1;
const char *quotes = " '";
struct pkcs11_entry *pe = NULL;
char *p = strdup(data);
if (!p)
{
goto out;
}
token = strtok(p, ",");
/* parse index */
if (token)
{
StrTrimA(token, quotes);
UINT i = strtoul(token, NULL, 10);
if (i >= l->count) /* invalid entry number */
{
goto out;
}
index = i;
}
pe = &l->pe[index];
while ((token = strtok(NULL, ",")) != NULL)
{
char *tmp;
if ((tmp = strstr(token, "ID:")) != NULL)
{
tmp += 3;
StrTrimA(tmp, quotes);
pe->id = strdup(tmp);
}
else if ((tmp = strstr(token, "BLOB:")) != NULL)
{
tmp += 5;
StrTrimA(tmp, quotes);
if (!decode_certificate(&pe->cert, tmp))
{
pkcs11_entry_free(pe);
index = (UINT) -1;
goto out;
}
}
}
out:
free(p);
return index;
}
/* send pkcs11-id to management-interface */
static void
pkcs11_id_send(connection_t *c, const char *id)
{
const char *format = "needstr 'pkcs11-id-request' '%s'";
size_t len = strlen(format) + (id ? strlen(id) : 0) + 1;
char *cmd = malloc(len);
if (cmd)
{
snprintf(cmd, len, format, id ? id : "");
cmd[len-1] = '\0';
ManagementCommand(c, cmd, NULL, regular);
}
else
{
WriteStatusLog(c, L"GUI> ", L"Out of memory in pkcs11_id_send", false);
ManagementCommand(c, "needstr 'pkcs11-id-request' ''", NULL, regular);
}
free(cmd);
}
static INT_PTR CALLBACK QueryPkcs11DialogProc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam);
/* Handle Need 'pkcs11-id-request' from management */
void
OnPkcs11(connection_t *c, UNUSED char *msg)
{
struct pkcs11_list *l = &c->pkcs11_list;
pkcs11_list_clear(l);
l->selected = (UINT) -1; /* set selection to an invalid index */
/* prompt user to select a certificate */
if (IDOK == LocalizedDialogBoxParamEx(ID_DLG_PKCS11_QUERY, c->hwndStatus, QueryPkcs11DialogProc, (LPARAM)c)
&& l->state & STATE_SELECTED
&& l->selected < l->count)
{
pkcs11_id_send(c, l->pe[l->selected].id);
}
}
/* Callback when pkcs11-id-count is received */
static void
pkcs11_count_recv(connection_t *c, char *msg)
{
struct pkcs11_list *l = &c->pkcs11_list;
if (msg && strbegins(msg, ">PKCS11ID-COUNT:"))
{
l->count = strtoul(msg+16, NULL, 10);
}
else
{
WriteStatusLog(c, L"GUI> ", L"Invalid pkcs11-id-count ignored", false);
l->state &= ~STATE_GET_COUNT;
}
if (l->count == 0)
{
l->state |= STATE_FILLED;
}
}
/*
* Callback for receiving pkcs11 entry from daemon.
* Expect msg = >PKCS11ID-ENTRY:'index', ID:'<id>', BLOB:'<cert>'
*/
static void
pkcs11_entry_recv(connection_t *c, char *msg)
{
struct pkcs11_list *l = &c->pkcs11_list;
UINT index = (UINT) -1;
if (msg && strbegins(msg, ">PKCS11ID-ENTRY:"))
{
index = pkcs11_entry_parse(msg+16, l);
}
if (index == (UINT) -1)
{
WriteStatusLog(c, L"GUI> ", L"Invalid pkcs11 entry ignored.", false);
return;
}
else if (index + 1 == l->count) /* done */
{
l->state |= STATE_FILLED;
}
}
/*
* Helper to populate the pkcs11 list by querying the daemon
*
* The requests are queued and completed asynchronously.
* We return immediately if already in progress or
* not yet ready to populate. This is called by
* pkcs11_listview_fill until state & STATE_FILLED evaluates to 1.
*
* To recreate the list afresh, call pkcs11_list_clear() first.
*/
static void
pkcs11_list_update(connection_t *c)
{
struct pkcs11_list *l = &c->pkcs11_list;
if ((l->state & STATE_GET_COUNT) == 0)
{
ManagementCommand(c, "pkcs11-id-count", pkcs11_count_recv, regular);
l->state |= STATE_GET_COUNT;
}
else if (l->count > 0 && (l->state & STATE_GET_ENTRY) == 0)
{
if (!l->pe
&& !pkcs11_list_alloc(l))
{
WriteStatusLog(c, L"GUI> ", L"Out of memory for pkcs11 entry list", false);
l->count = 0;
l->state |= STATE_FILLED;
return;
}
/* required space = strlen("pkcs11-id-get ") + 10 + 1 = 25 */
char cmd[25];
for (UINT i = 0; i < l->count; i++)
{
_snprintf_0(cmd, "pkcs11-id-get %u", i);
ManagementCommand(c, cmd, pkcs11_entry_recv, regular);
}
l->state |= STATE_GET_ENTRY;
}
}
static void
listview_set_column_width(HWND lv)
{
for (int i = 0; i < 3; i++)
{
/* MSDN docs on this is not clear, but using AUTOSIZE_USEHEADER
* instead of AUTOSIZE ensures the column is wide enough for
* both header and content strings -- must be set again if/when
* content or header strings are modified. */
ListView_SetColumnWidth(lv, i, LVSCW_AUTOSIZE_USEHEADER);
}
}
/*
* Position widgets in pkcs11 list window using current dpi.
* Takes client area width and height in screen pixels as input.
*/
static void
pkcs11_listview_resize(HWND hwnd, UINT w, UINT h)
{
HWND lv = GetDlgItem(hwnd, ID_LVW_PKCS11);
MoveWindow(lv, DPI_SCALE(20), DPI_SCALE(25),
w - DPI_SCALE(40), h - DPI_SCALE(120), TRUE);
MoveWindow(GetDlgItem(hwnd, ID_TXT_PKCS11), DPI_SCALE(20), DPI_SCALE(5),
w-DPI_SCALE(30), DPI_SCALE(15), TRUE);
MoveWindow(GetDlgItem(hwnd, ID_TXT_WARNING), DPI_SCALE(20), h - DPI_SCALE(80),
w-DPI_SCALE(20), DPI_SCALE(30), TRUE);
MoveWindow(GetDlgItem(hwnd, IDOK), DPI_SCALE(20), h - DPI_SCALE(30),
DPI_SCALE(60), DPI_SCALE(23), TRUE);
MoveWindow(GetDlgItem(hwnd, IDCANCEL), DPI_SCALE(90), h - DPI_SCALE(30),
DPI_SCALE(60), DPI_SCALE(23), TRUE);
MoveWindow(GetDlgItem(hwnd, IDRETRY), DPI_SCALE(200), h - DPI_SCALE(30),
DPI_SCALE(60), DPI_SCALE(23), TRUE);
listview_set_column_width(lv);
}
/* initialize the listview widget for displaying pkcs11 entries */
static HWND
pkcs11_listview_init(HWND parent)
{
HWND lv;
RECT rc;
lv = GetDlgItem(parent, ID_LVW_PKCS11);
if (!lv)
{
return NULL;
}
SendMessage(lv, LVM_SETEXTENDEDLISTVIEWSTYLE, 0, LVS_EX_FULLROWSELECT);
/* Use bold font for header */
HFONT hf = (HFONT) SendMessage(lv, WM_GETFONT, 0, 0);
if (hf)
{
LOGFONT lf;
GetObject(hf, sizeof(LOGFONT), &lf);
lf.lfWeight = FW_BOLD;
HFONT hfb = CreateFontIndirect(&lf);
if (hfb && SetPropW(parent, hfontProp, (HANDLE)hfb))
{
SendMessage(ListView_GetHeader(lv), WM_SETFONT, (WPARAM)hfb, 1);
}
else if (hfb)
{
DeleteObject(hfb);
}
}
/* Add column headings */
int hdrs[] = {IDS_CERT_DISPLAYNAME, IDS_CERT_ISSUER, IDS_CERT_NOTAFTER};
LVCOLUMNW lvc;
lvc.mask = LVCF_TEXT | LVCF_SUBITEM;
for (int i = 0; i < 3; i++)
{
lvc.iSubItem = i;
lvc.pszText = LoadLocalizedString(hdrs[i]);
ListView_InsertColumn(lv, i, &lvc);
}
GetClientRect(parent, &rc);
pkcs11_listview_resize(parent, rc.right-rc.left, rc.bottom-rc.top);
EnableWindow(lv, FALSE); /* disable until filled in */
EnableWindow(GetDlgItem(parent, IDOK), FALSE);
EnableWindow(GetDlgItem(parent, IDRETRY), FALSE);
return lv;
}
/* Populate the pkcs11 list and listview widget. Unless the state
* of the list evaluates to STATE_FILLED, a callback to this
* is requeued. Meant to be used as a Timer callback.
*/
static void CALLBACK
pkcs11_listview_fill(HWND hwnd, UINT UNUSED msg, UINT_PTR id, DWORD UNUSED now)
{
connection_t *c = (connection_t *) GetProp(hwnd, cfgProp);
struct pkcs11_list *l = &c->pkcs11_list;
HWND lv = GetDlgItem(hwnd, ID_LVW_PKCS11);
LVITEMW lvi = {0};
lvi.mask = LVIF_TEXT|LVIF_PARAM;
if ((l->state & STATE_FILLED) == 0)
{
/* request list update and set a timer to call this routine again */
pkcs11_list_update(c);
SetTimer(hwnd, id, 100, pkcs11_listview_fill);
}
else
{
int pos;
for (UINT i = 0; i < l->count; i++)
{
lvi.iItem = i;
lvi.iSubItem = 0;
lvi.pszText = l->pe[i].cert.commonname;
lvi.lParam = (LPARAM) i;
pos = ListView_InsertItem(lv, &lvi);
ListView_SetItemText(lv, pos, 1, l->pe[i].cert.issuer);
ListView_SetItemText(lv, pos, 2, l->pe[i].cert.notAfter);
}
if (l->count == 0)
{
/* no certificates -- show a message and let user retry */
SetDlgItemTextW(hwnd, ID_TXT_WARNING, LoadLocalizedString(IDS_ERR_NO_PKCS11));
EnableWindow(GetDlgItem(hwnd, IDRETRY), TRUE);
}
else
{
EnableWindow(lv, TRUE);
SetFocus(lv);
EnableWindow(GetDlgItem(hwnd, IDOK), TRUE);
EnableWindow(GetDlgItem(hwnd, IDRETRY), TRUE);
SendMessage(GetDlgItem(hwnd, IDOK), BM_SETSTYLE, BS_DEFPUSHBUTTON, TRUE);
SendMessage(GetDlgItem(hwnd, IDCANCEL), BM_SETSTYLE, BS_PUSHBUTTON, TRUE);
SendMessage(GetDlgItem(hwnd, IDRETRY), BM_SETSTYLE, BS_PUSHBUTTON, TRUE);
}
/* if there is only one item, select it by default */
if (l->count == 1)
{
ListView_SetItemState(lv, pos, LVIS_SELECTED, LVIS_SELECTED);
}
listview_set_column_width(lv);
KillTimer(hwnd, id);
}
}
/* Reset the listview, clear the list and initiate a fresh scan
* without closing the dialog.
*/
static void
pkcs11_listview_reset(HWND parent)
{
connection_t *c = (connection_t *) GetProp(parent, cfgProp);
struct pkcs11_list *l = &c->pkcs11_list;
HWND lv = GetDlgItem(parent, ID_LVW_PKCS11);
/* ensure the list is not being built and the widget exists */
if ((l->state & STATE_FILLED) == 0 || !lv)
{
return;
}
/* clear the list and listview */
pkcs11_list_clear(l);
EnableWindow(lv, FALSE);
EnableWindow(GetDlgItem(parent, IDOK), FALSE);
EnableWindow(GetDlgItem(parent, IDRETRY), FALSE);
ListView_DeleteAllItems(lv);
SetDlgItemTextW(parent, ID_TXT_WARNING, L"");
/* initiate a rebuild of the list */
SetTimer(parent, 0, 100, pkcs11_listview_fill);
}
void
display_certificate(HWND parent, connection_t *c, UINT i)
{
struct pkcs11_list *l = &c->pkcs11_list;
if (i < l->count)
{
/* Currently cryptui.lib is missing in mingw for i686
* Remove this and corresponding check in configure.ac
* when that changes.
*/
#if defined(HAVE_LIBCRYPTUI) || defined (_MSC_VER)
CryptUIDlgViewContext(CERT_STORE_CERTIFICATE_CONTEXT, l->pe[i].cert.ctx,
parent, L"Certificate", 0, NULL);
#else
(void) i;
(void) parent;
WriteStatusLog(c, L"GUI> ", L"Certificate display not supported in this build", false);
#endif
}
}
/* Dialog proc for querying pkcs11 */
static INT_PTR CALLBACK
QueryPkcs11DialogProc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
connection_t *c;
switch (msg)
{
case WM_INITDIALOG:
c = (connection_t *) lParam;
TRY_SETPROP(hwndDlg, cfgProp, (HANDLE)lParam);
SetStatusWinIcon(hwndDlg, ID_ICO_APP);
/* init the listview and schedule a call to listview_fill */
if (pkcs11_listview_init(hwndDlg))
{
SetTimer(hwndDlg, 0, 50, pkcs11_listview_fill);
}
else
{
WriteStatusLog(c, L"GUI> ", L"Error initializing pkcs11 selection dialog.", false);
EndDialog(hwndDlg, wParam);
}
return TRUE;
case WM_COMMAND:
c = (connection_t *) GetProp(hwndDlg, cfgProp);
if (LOWORD(wParam) == IDOK)
{
HWND lv = GetDlgItem(hwndDlg, ID_LVW_PKCS11);
int id = (int) ListView_GetNextItem(lv, -1, LVNI_ALL|LVNI_SELECTED);
LVITEM lvi = {.iItem = id, .mask = LVIF_PARAM};
if (id >= 0 && ListView_GetItem(lv, &lvi))
{
c->pkcs11_list.selected = (UINT) lvi.lParam;
c->pkcs11_list.state |= STATE_SELECTED;
}
else if (c->pkcs11_list.count > 0)
{
/* No selection -- show an error message */
SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, LoadLocalizedString(IDS_ERR_SELECT_PKCS11));
return TRUE;
}
EndDialog(hwndDlg, wParam);
return TRUE;
}
else if (LOWORD(wParam) == IDCANCEL)
{
StopOpenVPN(c);
EndDialog(hwndDlg, wParam);
return TRUE;
}
else if (LOWORD(wParam) == IDRETRY)
{
pkcs11_listview_reset(hwndDlg);
return TRUE;
}
break;
case WM_CTLCOLORSTATIC:
if (GetDlgCtrlID((HWND) lParam) == ID_TXT_WARNING)
{
HBRUSH br = (HBRUSH) DefWindowProc(hwndDlg, msg, wParam, lParam);
COLORREF clr = o.clr_warning;
SetTextColor((HDC) wParam, clr);
return (INT_PTR) br;
}
break;
case WM_SIZE:
pkcs11_listview_resize(hwndDlg, LOWORD(lParam), HIWORD(lParam));
InvalidateRect(hwndDlg, NULL, TRUE);
return FALSE;
case WM_NOTIFY:
c = (connection_t *) GetProp(hwndDlg, cfgProp);
if (((NMHDR *)lParam)->idFrom == ID_LVW_PKCS11)
{
NMITEMACTIVATE *ln = (NMITEMACTIVATE *) lParam;
if (ln->iItem >= 0 && ln->uNewState & LVNI_SELECTED)
{
/* remove the no-selection warning */
SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, L"");
}
if (ln->hdr.code == NM_DBLCLK && ln->iItem >= 0)
{
display_certificate(hwndDlg, c, (UINT) ln->iItem);
}
}
break;
case WM_CLOSE:
c = (connection_t *) GetProp(hwndDlg, cfgProp);
StopOpenVPN(c);
EndDialog(hwndDlg, wParam);
return TRUE;
case WM_NCDESTROY:
RemoveProp(hwndDlg, cfgProp);
HFONT hf = (HFONT) GetProp(hwndDlg, hfontProp);
if (hf)
{
DeleteObject(hf);
}
RemoveProp(hwndDlg, hfontProp);
break;
}
return FALSE;
}
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