trunk/Src/wptClipDecryptDlg.cpp

/* wptClipDecryptDlg.cpp - Clipboard decrypt dialog
 *      Copyright (C) 2000-2005 Timo Schulz
 *      Copyright (C) 2005 g10 Code GmbH
 *
 * This file is part of WinPT.
 *
 * WinPT 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.
 * 
 * WinPT 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 WinPT; 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 "wptTypes.h"
#include "wptW32API.h"
#include "wptAgent.h"
#include "wptNLS.h"
#include "wptGPG.h"
#include "wptVersion.h"
#include "wptErrors.h"
#include "wptCommonCtl.h"
#include "wptContext.h"
#include "wptDlgs.h"
#include "wptKeylist.h"
#include "wptUTF8.h"
#include "resource.h"

bool is_seckey_available (gpgme_recipient_t rset);

/* Return the primary user-ID of the key with the keyid @keyid. 
   Caller must free string. */
char*
get_key_userid (const char *keyid)
{
    winpt_key_s key;
    char *uid;

    memset (&key, 0, sizeof (key));
    if (winpt_get_pubkey (keyid, &key))
        return m_strdup (_("user ID not found"));
    uid = new char[strlen (key.ext->uids->uid) + 4 + 8];
    if (!uid)
        BUG (NULL);
    sprintf (uid, "\n    \"%s\"", key.ext->uids->uid);
    winpt_release_pubkey (&key);
    return uid;
}


/* Decrypt the clipboard contents and on success
   replace the data with the plaintext.
   Return value: 0 on success. */
gpgme_error_t
gpgme_op_clip_decrypt (gpgme_ctx_t ctx)
{
    gpgme_error_t err;
    gpgme_data_t ciph = NULL;
    gpgme_data_t plain = NULL;
    
    err = gpg_data_new_from_clipboard (&ciph, 0);
    if (err)
        return err;

    err = gpgme_data_new (&plain);
    if (err) {
        gpgme_data_release (ciph);
        return err;
    }

    err = gpgme_op_decrypt_verify (ctx, ciph, plain);

    gpg_data_release_and_set_clipboard (plain, 0);
    gpgme_data_release (ciph);
    return err;
}


/* Convenient function to provide clipboard decryption.
   @hwnd is the parent window used for showing messsages.
   Return value: 0 on success. */
gpgme_error_t
clip_decrypt_dlg (HWND hwnd)
{
    gpgme_error_t err;
    gpgme_ctx_t ctx = NULL;
    gpgme_signature_t sig = NULL;
    gpgme_decrypt_result_t res;
    gpgme_verify_result_t sigres;
    passphrase_cb_s pwd;
    const char *s;
    const char *uid;
    int pgp_type = 0;
    int novalid = 0;

    /* allow to verify data generated by 'gpg -a --sign foo' */
    if (fm_assume_onepass_sig (NULL) == 1) {
        dialog_box_param (glob_hinst, (LPCSTR)IDD_WINPT_VERIFY, hwnd,
                          clip_verify_dlg_proc, 0, 
                          _("Verify"), IDS_WINPT_VERIFY);
        return 0;
    }

    err = gpgme_new (&ctx);
    if (err)
        BUG (NULL);
    set_gpg_passphrase_cb (&pwd, ctx, GPG_CMD_DECRYPT, hwnd, _("Decryption"));
    gpg_get_recipients (NULL, &pwd.recipients);

    err = gpgme_op_clip_decrypt (ctx);
    if (pwd.cancel)
        goto leave;
    if (gpgme_err_code (err) ==  GPG_ERR_BAD_PASSPHRASE)
        agent_del_cache (pwd.keyid);

    res = gpgme_op_decrypt_result (ctx);
    if (err && res->recipients && !is_seckey_available (res->recipients)) {
        gpgme_recipient_t r = res->recipients;
        char *u = get_key_userid (r->keyid+8);
        log_box (_("Decryption"), MB_ERR, 
                 _("Encrypted with %s key, ID %s.%s\n"
                   "Decryption failed: secret key not available."), 
                   get_key_pubalgo (r->pubkey_algo), r->keyid+8, u);
        free_if_alloc (u);
        goto leave;
    }
    else if (res->unsupported_algorithm) {
        log_box (_("Decryption"), MB_ERR, _("Unsupported algorithm: %s"), 
                 res->unsupported_algorithm);
    }
    else if (err) {
        gpg_clip_get_pgptype (&pgp_type);
        if (gpgme_err_code (err) == GPG_ERR_NO_DATA && (pgp_type & PGP_MESSAGE))
            msg_box (hwnd, _("Broken OpenPGP message (maybe: quoted printable "
                             "character in armor)."), _("Decryption"), MB_INFO);
        else
            msg_box (hwnd, gpgme_strerror (err), _("Decryption"), MB_ERR);
        goto leave;
    }

    if (0) { /* XXX: Bad MDC */
        s = _("WARNING: encrypted message has been manipulated!\n"
            "\n"
            "Do *NOT* trust any text or data output from this file!\n"
            "It is likely, the data was corrupted during the transport\n"
            "but it might be also possible that this is part of an attack.");
        msg_box (hwnd, s, _("*** IMPORTANT ***"), MB_INFO);
    }

    show_msg (GetDesktopWindow (), 1500, _("GnuPG Status: Finished"));

    sigres = gpgme_op_verify_result (ctx);
    if (sigres && sigres->signatures) {
        winpt_key_s key;
        const char *keyid;

        sig = sigres->signatures;
        if (!sig->fpr)
            BUG (NULL);
        keyid = get_keyid_from_fpr (sig->fpr);
        memset (&key, 0, sizeof (key));
        if (!winpt_get_pubkey (keyid, &key)) {
            if (key.ctx->owner_trust == GPGME_VALIDITY_FULL || 
                key.ctx->owner_trust == GPGME_VALIDITY_ULTIMATE)
                s = _("Signature Status: Created with a fully trusted key");
            else if (key.ctx->owner_trust == GPGME_VALIDITY_MARGINAL)
                s = _("Signature Status: Created with a marginal trusted key");
            else if (key.ctx->owner_trust == GPGME_VALIDITY_NEVER) {
                novalid = 1;
                s =  _("Signature Status: Created with an UNTRUSTED key");
            }
            else
                s = _("Signature Status: Created with an undefined trusted key");
            uid = key.ext->uids->uid;
        }
        else {
            s = "";
            uid = _("user ID not found");
        }
        log_box (_("WinPT Verify"), MB_OK, 
                 _("%s\n"
                   "%s\n"
                   "Signature made: %s\n"
                   "From \"%s\" using key ID 0x%s"
                   "%s %s"),
                   s, get_gpg_sigstat (sig->summary), 
                   strtimestamp (sig->timestamp),
                   uid, keyid, 
                   novalid? "\nPrimary key fingerprint: " : "",
                   novalid? get_key_fpr (key.ctx) : "");
    }
    
leave:
    release_gpg_passphrase_cb (&pwd);
    gpgme_release (ctx);
    return err;
}
1	werner	36	/* wptClipDecryptDlg.cpp - Clipboard decrypt dialog
2			* Copyright (C) 2000-2005 Timo Schulz
3			* Copyright (C) 2005 g10 Code GmbH
4			*
5			* This file is part of WinPT.
6			*
7			* WinPT is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* WinPT is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with WinPT; if not, write to the Free Software Foundation,
19			* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
20			*/
21
22	werner	42	#ifdef HAVE_CONFIG_H
23			#include <config.h>
24			#endif
25
26	werner	36	#include <windows.h>
27
28			#include "wptTypes.h"
29			#include "wptW32API.h"
30			#include "wptAgent.h"
31			#include "wptNLS.h"
32			#include "wptGPG.h"
33			#include "wptVersion.h"
34			#include "wptErrors.h"
35			#include "wptCommonCtl.h"
36			#include "wptContext.h"
37			#include "wptDlgs.h"
38			#include "wptKeylist.h"
39	twoaday	129	#include "wptUTF8.h"
40	werner	47	#include "resource.h"
41	werner	36
42	twoaday	217	bool is_seckey_available (gpgme_recipient_t rset);
43	werner	36
44			/* Return the primary user-ID of the key with the keyid @keyid.
45			Caller must free string. */
46			char*
47			get_key_userid (const char *keyid)
48			{
49	twoaday	208	winpt_key_s key;
50			char *uid;
51	werner	36
52	twoaday	208	memset (&key, 0, sizeof (key));
53			if (winpt_get_pubkey (keyid, &key))
54	werner	36	return m_strdup (_("user ID not found"));
55	twoaday	208	uid = new char[strlen (key.ext->uids->uid) + 4 + 8];
56	twoaday	129	if (!uid)
57	werner	36	BUG (NULL);
58	twoaday	208	sprintf (uid, "\n \"%s\"", key.ext->uids->uid);
59	twoaday	217	winpt_release_pubkey (&key);
60	twoaday	208	return uid;
61	werner	36	}
62
63
64			/* Decrypt the clipboard contents and on success
65			replace the data with the plaintext.
66			Return value: 0 on success. */
67			gpgme_error_t
68			gpgme_op_clip_decrypt (gpgme_ctx_t ctx)
69			{
70			gpgme_error_t err;
71			gpgme_data_t ciph = NULL;
72			gpgme_data_t plain = NULL;
73
74			err = gpg_data_new_from_clipboard (&ciph, 0);
75			if (err)
76			return err;
77
78			err = gpgme_data_new (&plain);
79			if (err) {
80			gpgme_data_release (ciph);
81			return err;
82			}
83
84	twoaday	41	err = gpgme_op_decrypt_verify (ctx, ciph, plain);
85	werner	36
86			gpg_data_release_and_set_clipboard (plain, 0);
87			gpgme_data_release (ciph);
88			return err;
89			}
90
91
92			/* Convenient function to provide clipboard decryption.
93			@hwnd is the parent window used for showing messsages.
94			Return value: 0 on success. */
95			gpgme_error_t
96			clip_decrypt_dlg (HWND hwnd)
97			{
98			gpgme_error_t err;
99			gpgme_ctx_t ctx = NULL;
100			gpgme_signature_t sig = NULL;
101			gpgme_decrypt_result_t res;
102			gpgme_verify_result_t sigres;
103			passphrase_cb_s pwd;
104	twoaday	41	const char *s;
105	twoaday	208	const char *uid;
106	twoaday	179	int pgp_type = 0;
107	werner	36	int novalid = 0;
108
109			/* allow to verify data generated by 'gpg -a --sign foo' */
110	twoaday	214	if (fm_assume_onepass_sig (NULL) == 1) {
111			dialog_box_param (glob_hinst, (LPCSTR)IDD_WINPT_VERIFY, hwnd,
112			clip_verify_dlg_proc, 0,
113			_("Verify"), IDS_WINPT_VERIFY);
114			return 0;
115	werner	36	}
116
117			err = gpgme_new (&ctx);
118			if (err)
119			BUG (NULL);
120			set_gpg_passphrase_cb (&pwd, ctx, GPG_CMD_DECRYPT, hwnd, _("Decryption"));
121	twoaday	179	gpg_get_recipients (NULL, &pwd.recipients);
122
123	werner	36	err = gpgme_op_clip_decrypt (ctx);
124			if (pwd.cancel)
125			goto leave;
126			if (gpgme_err_code (err) == GPG_ERR_BAD_PASSPHRASE)
127			agent_del_cache (pwd.keyid);
128
129			res = gpgme_op_decrypt_result (ctx);
130	twoaday	217	if (err && res->recipients && !is_seckey_available (res->recipients)) {
131	werner	36	gpgme_recipient_t r = res->recipients;
132	twoaday	208	char *u = get_key_userid (r->keyid+8);
133	werner	36	log_box (_("Decryption"), MB_ERR,
134			_("Encrypted with %s key, ID %s.%s\n"
135			"Decryption failed: secret key not available."),
136	twoaday	208	get_key_pubalgo (r->pubkey_algo), r->keyid+8, u);
137			free_if_alloc (u);
138	werner	36	goto leave;
139			}
140	twoaday	41	else if (res->unsupported_algorithm) {
141			log_box (_("Decryption"), MB_ERR, _("Unsupported algorithm: %s"),
142			res->unsupported_algorithm);
143			}
144	werner	36	else if (err) {
145			gpg_clip_get_pgptype (&pgp_type);
146	twoaday	129	if (gpgme_err_code (err) == GPG_ERR_NO_DATA && (pgp_type & PGP_MESSAGE))
147	werner	36	msg_box (hwnd, _("Broken OpenPGP message (maybe: quoted printable "
148	twoaday	129	"character in armor)."), _("Decryption"), MB_INFO);
149	werner	36	else
150			msg_box (hwnd, gpgme_strerror (err), _("Decryption"), MB_ERR);
151			goto leave;
152			}
153
154	twoaday	179	if (0) { /* XXX: Bad MDC */
155	werner	36	s = _("WARNING: encrypted message has been manipulated!\n"
156			"\n"
157			"Do NOT trust any text or data output from this file!\n"
158			"It is likely, the data was corrupted during the transport\n"
159			"but it might be also possible that this is part of an attack.");
160			msg_box (hwnd, s, _("* IMPORTANT *"), MB_INFO);
161	twoaday	179	}
162	werner	36
163			show_msg (GetDesktopWindow (), 1500, _("GnuPG Status: Finished"));
164
165			sigres = gpgme_op_verify_result (ctx);
166			if (sigres && sigres->signatures) {
167	twoaday	208	winpt_key_s key;
168	twoaday	41	const char *keyid;
169	werner	36
170			sig = sigres->signatures;
171			if (!sig->fpr)
172	twoaday	41	BUG (NULL);
173	twoaday	205	keyid = get_keyid_from_fpr (sig->fpr);
174	twoaday	208	memset (&key, 0, sizeof (key));
175			if (!winpt_get_pubkey (keyid, &key)) {
176			if (key.ctx->owner_trust == GPGME_VALIDITY_FULL \|\|
177			key.ctx->owner_trust == GPGME_VALIDITY_ULTIMATE)
178	twoaday	41	s = _("Signature Status: Created with a fully trusted key");
179	twoaday	208	else if (key.ctx->owner_trust == GPGME_VALIDITY_MARGINAL)
180	twoaday	41	s = _("Signature Status: Created with a marginal trusted key");
181	twoaday	208	else if (key.ctx->owner_trust == GPGME_VALIDITY_NEVER) {
182	twoaday	41	novalid = 1;
183			s = _("Signature Status: Created with an UNTRUSTED key");
184			}
185			else
186			s = _("Signature Status: Created with an undefined trusted key");
187	twoaday	208	uid = key.ext->uids->uid;
188	werner	36	}
189	twoaday	179	else {
190	twoaday	41	s = "";
191	twoaday	208	uid = _("user ID not found");
192	twoaday	179	}
193	werner	36	log_box (_("WinPT Verify"), MB_OK,
194			_("%s\n"
195			"%s\n"
196	twoaday	129	"Signature made: %s\n"
197	werner	36	"From \"%s\" using key ID 0x%s"
198			"%s %s"),
199	twoaday	41	s, get_gpg_sigstat (sig->summary),
200			strtimestamp (sig->timestamp),
201	twoaday	205	uid, keyid,
202	werner	36	novalid? "\nPrimary key fingerprint: " : "",
203	twoaday	208	novalid? get_key_fpr (key.ctx) : "");
204	werner	36	}
205
206			leave:
207			release_gpg_passphrase_cb (&pwd);
208			gpgme_release (ctx);
209			return err;
210			}