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/* wptClipboard.cpp - GPG related clipboard functions |
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* Copyright (C) 2001, 2002, 2003, 2005, 2006, 2009 Timo Schulz |
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* Copyright (C) 2005 g10 Code GmbH |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* WinPT is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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|
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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|
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#include <windows.h> |
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#include <gpgme.h> |
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|
| 25 |
#include "wptW32API.h" |
| 26 |
#include "wptCrypto.h" |
| 27 |
#include "wptVersion.h" |
| 28 |
#include "wptGPG.h" |
| 29 |
#include "wptTypes.h" |
| 30 |
#include "wptUTF8.h" |
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|
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/* Default buffer size. */ |
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#define BUFSIZE 192 |
| 34 |
|
| 35 |
gpgme_error_t gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen); |
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|
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/* XXX: define clipboard errors. */ |
| 38 |
|
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/* Check if the clipboard contains text. @r_val contains |
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one text data is available. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_clip_istext_avail (int *r_val) |
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{ |
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HANDLE clipmem; |
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char *clipdata; |
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|
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if (!r_val) |
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return gpg_error (GPG_ERR_INV_ARG); |
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*r_val = 0; |
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if (OpenClipboard (NULL) == FALSE) |
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return gpg_error (GPG_ERR_INTERNAL); |
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|
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clipmem = GetClipboardData (CF_TEXT); |
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if (!clipmem) { |
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CloseClipboard(); |
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return gpg_error (GPG_ERR_NO_DATA); |
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} |
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|
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clipdata = (char *) GlobalLock (clipmem); |
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if (!clipdata) { |
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CloseClipboard (); |
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return gpg_error (GPG_ERR_INTERNAL); |
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} |
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|
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if (strlen (clipdata) > 0) |
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*r_val = 1; |
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GlobalUnlock (clipmem); |
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CloseClipboard (); |
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return 0; |
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} |
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|
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|
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/* Figure out what kind of PGP data is stored in @data. |
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@r_type contains the ORed types on success. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_clip_parse_pgpid (const char *data, int *r_type) |
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{ |
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int type; |
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|
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if (!data) |
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return gpg_error (GPG_ERR_INV_ARG); |
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if (strlen (data) < 19) { |
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*r_type = 0; |
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return 0; |
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} |
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type = 0; |
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if (strstr (data, "BEGIN PGP MESSAGE")) |
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type |= PGP_MESSAGE; |
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if (strstr (data, "BEGIN PGP SIGNED MESSAGE")) |
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type |= PGP_CLEARSIG; |
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if (strstr (data, "BEGIN PGP SIGNATURE")) |
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type |= PGP_SIG; |
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if (strstr (data, "BEGIN PGP PUBLIC KEY BLOCK")) |
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type |= PGP_PUBKEY; |
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if (strstr (data, "BEGIN PGP PRIVATE KEY BLOCK") || |
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strstr (data, "BEGIN PGP SECRET KEY BLOCK")) |
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type |= PGP_SECKEY; |
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// Actually this is no type but rather a flag to |
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// indicate the that the data is 'dash escaped' |
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if (strstr (data, "- -----BEGIN")) |
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type |= PGP_DASH_ESCAPED; |
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*r_type = type; |
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return 0; |
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} |
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|
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|
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/* Check if the clipboard is already OpenPGP protected. |
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@r_type optional returns the type and @r_val contains |
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1 for yes. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_clip_is_secured (int *r_type, int *r_val) |
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{ |
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HANDLE clipmem; |
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char *clipdata; |
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|
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if (!r_val) |
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return gpg_error (GPG_ERR_INV_ARG); |
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if (OpenClipboard (NULL) == FALSE) |
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return gpg_error (GPG_ERR_INTERNAL); |
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clipmem = GetClipboardData (CF_TEXT); |
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if (!clipmem) { |
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*r_val = 0; |
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CloseClipboard(); |
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return gpg_error (GPG_ERR_NO_DATA); |
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} |
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clipdata = (char *) GlobalLock (clipmem); |
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if (!clipdata) { |
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*r_val = 0; |
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CloseClipboard(); |
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return gpg_error (GPG_ERR_INTERNAL); |
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} |
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if (strlen (clipdata) > 32 && |
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strstr (clipdata, "-----BEGIN PGP") && |
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strstr (clipdata, "-----END PGP")) |
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*r_val = 1; |
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GlobalUnlock (clipmem); |
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gpg_clip_parse_pgpid (clipdata, r_type); |
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CloseClipboard (); |
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return gpg_error (GPG_ERR_NO_ERROR); |
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} |
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|
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|
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/* Return the OpenPGP data format of the clipboard in @r_type. |
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Return 0 on success. */ |
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gpgme_error_t |
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gpg_clip_get_pgptype (int *r_type) |
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{ |
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HANDLE clipmem; |
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char *clipdata; |
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|
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if (OpenClipboard (NULL) == FALSE) |
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return gpg_error (GPG_ERR_INTERNAL); |
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clipmem = GetClipboardData (CF_TEXT); |
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if (!clipmem) { |
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CloseClipboard (); |
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return gpg_error (GPG_ERR_NO_DATA); |
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} |
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clipdata = (char *)GlobalLock (clipmem); |
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if (!clipdata) { |
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CloseClipboard (); |
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return gpg_error (GPG_ERR_INTERNAL); |
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} |
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gpg_clip_parse_pgpid (clipdata, r_type); |
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GlobalUnlock (clipmem); |
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CloseClipboard (); |
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return gpg_error (GPG_ERR_NO_ERROR); |
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} |
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|
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|
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/* Retrieve the text of the clipboard. |
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Return value: the text as a string, NULL otherwise. */ |
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static char* |
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get_w32_clip_text (void) |
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{ |
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char *private_clip; |
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char *clip; |
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size_t size; |
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HANDLE cb; |
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|
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if (!OpenClipboard (NULL)) |
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return NULL; |
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cb = GetClipboardData (CF_TEXT); |
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if (!cb) { |
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CloseClipboard (); |
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return NULL; |
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} |
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private_clip = (char *)GlobalLock (cb); |
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if (!private_clip) { |
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CloseClipboard (); |
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return NULL; |
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} |
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size = strlen (private_clip); |
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clip = new char[size+1]; |
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if (!clip) |
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BUG (NULL); |
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memset (clip, 0, size+1); |
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memcpy (clip, private_clip, size); |
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GlobalUnlock(cb); |
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CloseClipboard (); |
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return clip; |
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} |
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|
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|
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/* Set the new clipboard data to @data. */ |
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static void |
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set_w32_clip_text (const char *data, int size) |
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{ |
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HANDLE cb; |
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char *private_data; |
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|
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if (!OpenClipboard(NULL)) |
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return; |
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cb = GlobalAlloc (GHND, size+1); |
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if (!cb) |
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BUG (NULL); |
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private_data = (char*)GlobalLock (cb); |
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if (private_data != NULL) { |
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EmptyClipboard (); |
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memset (private_data, 0, size+1); |
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memcpy (private_data, data, size); |
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SetClipboardData (CF_TEXT, cb); |
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GlobalUnlock (cb); |
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} |
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|
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CloseClipboard (); |
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GlobalFree (cb); |
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} |
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|
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|
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/* Search for the armor header 'Version:' in @r_dh and |
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add the WinPT version. On success @r_dh is replaced |
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with the modified data. |
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Return value: 0 on success. */ |
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static gpgme_error_t |
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gpg_data_change_version (gpgme_data_t *r_dh) |
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{ |
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gpgme_error_t err; |
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gpgme_data_t mdh; |
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const char *s; |
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char line[BUFSIZE+256]; |
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int found_version, hash_seen; |
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int n; |
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|
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if (!r_dh) |
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return gpg_error (GPG_ERR_INV_ARG); |
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|
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err = gpgme_data_new (&mdh); |
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if (err) |
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return err; |
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|
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found_version = 0; |
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hash_seen = 0; |
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/* Pattern we search for. */ |
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s = "Version: GnuPG"; |
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gpgme_data_rewind (*r_dh); |
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while ((n = gpg_data_readline (*r_dh, line, BUFSIZE-1)) > 0) { |
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if (found_version == 0 && !strncmp (line, "Hash:", 5)) { |
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// If we found a cleartext signature, we do not add a |
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// charset header in the signed area since it would broke |
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// the signature |
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hash_seen = 1; |
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} |
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|
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if (!strncmp (line, "\r\n", 2) && found_version == 0 && |
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hash_seen == 0) { |
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// If the user decided she will not tell what client she |
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// used, we will also omit the version and just output |
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// the charset info |
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line[strlen (line)- 2]=0; |
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strcat (line, /*"Version: WinPT "PGM_VERSION"\r\n"*/ |
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"Charset: UTF-8\r\n" |
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"\r\n"); |
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found_version = 1; |
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} |
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if (strlen (line) > strlen (s) && |
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!strncmp (line, s, strlen (s)) && |
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!stristr (line, "WinPT "PGM_VERSION)) { |
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/* Do not assume a \r\n sequence. */ |
| 282 |
if (strstr (line, "\r\n")) |
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line[strlen (line) - 2] = '\0'; |
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if (strstr (line, "\n")) |
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line[strlen (line) - 1] = '\0'; |
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// We add a charset header to indicate that the application |
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// on the recipients side is able to properly decode it |
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strcat (line, " - WinPT "PGM_VERSION"\r\n" |
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"Charset: UTF-8\r\n"); |
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found_version = 1; |
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} |
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gpgme_data_write (mdh, line, strlen (line)); |
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} |
| 294 |
|
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gpgme_data_write (mdh, "", 1); |
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gpgme_data_rewind (mdh); |
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gpgme_data_release (*r_dh); |
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*r_dh = mdh; |
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return err; |
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} |
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|
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|
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/* The problem is, that it might be also possible that we |
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received an ciphertext which is not encoded with UTF-8. |
| 305 |
Thus, we check explicitly for the 'Charset: UTF-8' header. |
| 306 |
If it is not found, we assume a different encoding and |
| 307 |
no decoding is performed. */ |
| 308 |
static int |
| 309 |
has_utf8_charset (gpgme_data_t dh) |
| 310 |
{ |
| 311 |
char buf[BUFSIZE+1]; |
| 312 |
int found = 0; |
| 313 |
|
| 314 |
for (;;) { |
| 315 |
int n = gpg_data_readline (dh, buf, BUFSIZE); |
| 316 |
if (n < 1) |
| 317 |
break; |
| 318 |
// Read until the first blank line, if the |
| 319 |
// header has not been found yet, it does not exist |
| 320 |
if ((n == 1 && buf[0] == '\n') || |
| 321 |
(n == 2 && buf[0] == '\r')) |
| 322 |
break; |
| 323 |
if (!memcmp (buf, "Charset:", 8) && strstr (buf, "UTF-8")) { |
| 324 |
found = 1; |
| 325 |
break; |
| 326 |
} |
| 327 |
} |
| 328 |
gpgme_data_rewind (dh); |
| 329 |
return found; |
| 330 |
} |
| 331 |
|
| 332 |
|
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/* Retrieve the clipboard data and create a new gpgme |
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data object @r_dh and return it. If @wraplen is > 0 |
| 335 |
wrap lines of the buffer. |
| 336 |
Return value: 0 on success. */ |
| 337 |
gpgme_error_t |
| 338 |
gpg_data_new_from_clipboard (gpgme_data_t *r_dh, int wraplen) |
| 339 |
{ |
| 340 |
gpgme_error_t err = 0; |
| 341 |
gpgme_data_t dh; |
| 342 |
char *clip_text = NULL; |
| 343 |
|
| 344 |
if (!r_dh) |
| 345 |
return gpg_error (GPG_ERR_INV_ARG); |
| 346 |
*r_dh = NULL; |
| 347 |
clip_text = get_w32_clip_text (); |
| 348 |
if (!clip_text) |
| 349 |
return gpg_error (GPG_ERR_NO_DATA); |
| 350 |
err = gpgme_data_new_from_mem (&dh, clip_text, strlen (clip_text), 1); |
| 351 |
if (clip_text) |
| 352 |
free (clip_text); |
| 353 |
if (wraplen > 0) |
| 354 |
gpg_data_wrap_lines (&dh, wraplen); |
| 355 |
|
| 356 |
*r_dh = dh; |
| 357 |
return err; |
| 358 |
} |
| 359 |
|
| 360 |
/* Retrieve the clipboard data and create a new gpgme |
| 361 |
data object @r_dh and return it. If @wraplen is > 0 |
| 362 |
wrap lines of the buffer. |
| 363 |
Return value: 0 on success. */ |
| 364 |
gpgme_error_t |
| 365 |
gpg_data_utf8_new_from_clipboard (gpgme_data_t *r_dh, |
| 366 |
int wraplen, int *r_is_utf8) |
| 367 |
{ |
| 368 |
gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR); |
| 369 |
gpgme_data_t dh; |
| 370 |
char *clip_text, *utf8_text; |
| 371 |
|
| 372 |
if (!r_dh) |
| 373 |
return gpg_error (GPG_ERR_INV_ARG); |
| 374 |
*r_dh = NULL; |
| 375 |
clip_text = get_w32_clip_text (); |
| 376 |
if (!clip_text) |
| 377 |
return gpg_error (GPG_ERR_NO_DATA); |
| 378 |
|
| 379 |
|
| 380 |
/* We automatically encode all clipboard data |
| 381 |
into the UTF-8 format for a portable transportation. */ |
| 382 |
utf8_text = native_to_utf8 (clip_text); |
| 383 |
free_if_alloc (clip_text); clip_text = utf8_text; |
| 384 |
|
| 385 |
err = gpgme_data_new_from_mem (&dh, clip_text, strlen (clip_text), 1); |
| 386 |
free_if_alloc (clip_text); |
| 387 |
if (wraplen > 0) |
| 388 |
gpg_data_wrap_lines (&dh, wraplen); |
| 389 |
|
| 390 |
// for ARMORED data find out if the Charset header is set to UTF8 |
| 391 |
if (r_is_utf8) |
| 392 |
*r_is_utf8 = has_utf8_charset (dh); |
| 393 |
|
| 394 |
*r_dh = dh; |
| 395 |
return err; |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
|
| 400 |
gpgme_error_t |
| 401 |
gpg_data_release_utf8_to_clipboard (gpgme_data_t dh) |
| 402 |
{ |
| 403 |
char *clip_text, *utf8_text; |
| 404 |
size_t n; |
| 405 |
|
| 406 |
if (!dh) |
| 407 |
return gpg_error (GPG_ERR_INV_ARG); |
| 408 |
|
| 409 |
gpgme_data_write (dh, "", 1); // make sure it's a string! |
| 410 |
utf8_text = gpgme_data_release_and_get_mem (dh, &n); |
| 411 |
if (!utf8_text) |
| 412 |
return gpg_error (GPG_ERR_INV_VALUE); |
| 413 |
if (n < 0) { |
| 414 |
gpgme_free (utf8_text); |
| 415 |
return gpg_error (GPG_ERR_NO_DATA); |
| 416 |
} |
| 417 |
|
| 418 |
/* We assume that all data from GPG is in UTF-8 and |
| 419 |
need to be decoded. If the charset is US-ASCII, |
| 420 |
this wouldn't do any harm, but if the data is ISO-XXX-XX |
| 421 |
we get scrambled output. */ |
| 422 |
utf8_text[n] = '\0'; |
| 423 |
clip_text = utf8_to_native (utf8_text); |
| 424 |
wipememory (utf8_text, n); |
| 425 |
gpgme_free (utf8_text); |
| 426 |
n = strlen (clip_text); |
| 427 |
set_w32_clip_text (clip_text, n); |
| 428 |
wipememory (clip_text, n); |
| 429 |
free_if_alloc (clip_text); |
| 430 |
return gpg_error (GPG_ERR_NO_ERROR); |
| 431 |
} |
| 432 |
|
| 433 |
|
| 434 |
/* Release a gpgme data object @dh and write the contents of |
| 435 |
the object to the clipboard. If @chg_ver is set, modify the |
| 436 |
Version: header and add WinPT information. */ |
| 437 |
gpgme_error_t |
| 438 |
gpg_data_release_to_clipboard (gpgme_data_t dh, int chg_ver) |
| 439 |
{ |
| 440 |
gpgme_data_t in; |
| 441 |
char *clip_text; |
| 442 |
size_t n; |
| 443 |
|
| 444 |
if (!dh) |
| 445 |
return gpg_error (GPG_ERR_INV_ARG); |
| 446 |
|
| 447 |
in = dh; |
| 448 |
if (chg_ver) |
| 449 |
gpg_data_change_version (&in); |
| 450 |
|
| 451 |
clip_text = gpgme_data_release_and_get_mem (in, &n); |
| 452 |
if (clip_text && *clip_text) { |
| 453 |
set_w32_clip_text (clip_text, n); |
| 454 |
wipememory (clip_text, n); |
| 455 |
gpgme_free (clip_text); |
| 456 |
} |
| 457 |
|
| 458 |
return gpg_error (GPG_ERR_NO_ERROR); |
| 459 |
} |
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