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 "wptFileManager.h"
#include "wptUTF8.h"
#include "resource.h"

bool secret_key_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)
{
    gpgme_key_t key;
    char *p, *uid;

    if (get_pubkey (keyid, &key))
        return m_strdup (_("user ID not found"));
    uid = utf8_to_native (key->uids->uid);
    if (!uid)
        uid = strdup (_("user ID not found"));
    p = new char[strlen (uid) + 4 + 8];
    if (!p)
        BUG (NULL);
    sprintf (p, "\n    \"%s\"", uid);
    safe_free (uid);
    return p;
}


/* 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;
    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) == 0) {
        /* XXX: addtitional steps needed? */
    }

    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 && !secret_key_available (res->recipients)) {
        gpgme_recipient_t r = res->recipients;
        uid = 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, uid);
        free_if_alloc (uid);
        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) {
        gpgme_key_t key=NULL;
        const char *keyid;

        sig = sigres->signatures;
        if (!sig->fpr)
            BUG (NULL);
        if (strlen (sig->fpr) > 16)
            keyid = strlen (sig->fpr) == 40? sig->fpr+24 : sig->fpr+16;
        else
            keyid = sig->fpr;

        get_pubkey (keyid, &key);
        if (key) {
            if (key->owner_trust == GPGME_VALIDITY_FULL || 
                key->owner_trust == GPGME_VALIDITY_ULTIMATE)
                s = _("Signature Status: Created with a fully trusted key");
            else if (key->owner_trust == GPGME_VALIDITY_MARGINAL)
                s = _("Signature Status: Created with a marginal trusted key");
            else if (key->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 = utf8_to_native (key->uids->uid);
        }
        else {
            s = "";
            uid = strdup (_("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+8, 
                   novalid? "\nPrimary key fingerprint: " : "",
                   novalid? get_key_fpr (key) : "");
        safe_free (uid);
    }
    
leave:
    release_gpg_passphrase_cb (&pwd);
    gpgme_release (ctx);
    return err;
}
1	/* 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	#ifdef HAVE_CONFIG_H
23	#include <config.h>
24	#endif
25
26	#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	#include "wptFileManager.h"
40	#include "wptUTF8.h"
41	#include "resource.h"
42
43	bool secret_key_available (gpgme_recipient_t rset);
44
45	/* Return the primary user-ID of the key with the keyid @keyid.
46	Caller must free string. */
47	char*
48	get_key_userid (const char *keyid)
49	{
50	gpgme_key_t key;
51	char p, uid;
52
53	if (get_pubkey (keyid, &key))
54	return m_strdup (_("user ID not found"));
55	uid = utf8_to_native (key->uids->uid);
56	if (!uid)
57	uid = strdup (_("user ID not found"));
58	p = new char[strlen (uid) + 4 + 8];
59	if (!p)
60	BUG (NULL);
61	sprintf (p, "\n \"%s\"", uid);
62	safe_free (uid);
63	return p;
64	}
65
66
67	/* Decrypt the clipboard contents and on success
68	replace the data with the plaintext.
69	Return value: 0 on success. */
70	gpgme_error_t
71	gpgme_op_clip_decrypt (gpgme_ctx_t ctx)
72	{
73	gpgme_error_t err;
74	gpgme_data_t ciph = NULL;
75	gpgme_data_t plain = NULL;
76
77	err = gpg_data_new_from_clipboard (&ciph, 0);
78	if (err)
79	return err;
80
81	err = gpgme_data_new (&plain);
82	if (err) {
83	gpgme_data_release (ciph);
84	return err;
85	}
86
87	err = gpgme_op_decrypt_verify (ctx, ciph, plain);
88
89	gpg_data_release_and_set_clipboard (plain, 0);
90	gpgme_data_release (ciph);
91	return err;
92	}
93
94
95	/* Convenient function to provide clipboard decryption.
96	@hwnd is the parent window used for showing messsages.
97	Return value: 0 on success. */
98	gpgme_error_t
99	clip_decrypt_dlg (HWND hwnd)
100	{
101	gpgme_error_t err;
102	gpgme_ctx_t ctx = NULL;
103	gpgme_signature_t sig = NULL;
104	gpgme_decrypt_result_t res;
105	gpgme_verify_result_t sigres;
106	passphrase_cb_s pwd;
107	const char *s;
108	char *uid;
109	int pgp_type = 0;
110	int novalid = 0;
111
112	/* allow to verify data generated by 'gpg -a --sign foo' */
113	if (fm_assume_onepass_sig (NULL) == 0) {
114	/* XXX: addtitional steps needed? */
115	}
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	gpg_get_recipients (NULL, &pwd.recipients);
122
123	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	if (err && res->recipients && !secret_key_available (res->recipients)) {
131	gpgme_recipient_t r = res->recipients;
132	uid = get_key_userid (r->keyid+8);
133	log_box (_("Decryption"), MB_ERR,
134	_("Encrypted with %s key, ID %s.%s\n"
135	"Decryption failed: secret key not available."),
136	get_key_pubalgo (r->pubkey_algo), r->keyid+8, uid);
137	free_if_alloc (uid);
138	goto leave;
139	}
140	else if (res->unsupported_algorithm) {
141	log_box (_("Decryption"), MB_ERR, _("Unsupported algorithm: %s"),
142	res->unsupported_algorithm);
143	}
144	else if (err) {
145	gpg_clip_get_pgptype (&pgp_type);
146	if (gpgme_err_code (err) == GPG_ERR_NO_DATA && (pgp_type & PGP_MESSAGE))
147	msg_box (hwnd, _("Broken OpenPGP message (maybe: quoted printable "
148	"character in armor)."), _("Decryption"), MB_INFO);
149	else
150	msg_box (hwnd, gpgme_strerror (err), _("Decryption"), MB_ERR);
151	goto leave;
152	}
153
154	if (0) { /* XXX: Bad MDC */
155	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	}
162
163	show_msg (GetDesktopWindow (), 1500, _("GnuPG Status: Finished"));
164
165	sigres = gpgme_op_verify_result (ctx);
166	if (sigres && sigres->signatures) {
167	gpgme_key_t key=NULL;
168	const char *keyid;
169
170	sig = sigres->signatures;
171	if (!sig->fpr)
172	BUG (NULL);
173	if (strlen (sig->fpr) > 16)
174	keyid = strlen (sig->fpr) == 40? sig->fpr+24 : sig->fpr+16;
175	else
176	keyid = sig->fpr;
177
178	get_pubkey (keyid, &key);
179	if (key) {
180	if (key->owner_trust == GPGME_VALIDITY_FULL \|\|
181	key->owner_trust == GPGME_VALIDITY_ULTIMATE)
182	s = _("Signature Status: Created with a fully trusted key");
183	else if (key->owner_trust == GPGME_VALIDITY_MARGINAL)
184	s = _("Signature Status: Created with a marginal trusted key");
185	else if (key->owner_trust == GPGME_VALIDITY_NEVER) {
186	novalid = 1;
187	s = _("Signature Status: Created with an UNTRUSTED key");
188	}
189	else
190	s = _("Signature Status: Created with an undefined trusted key");
191	uid = utf8_to_native (key->uids->uid);
192	}
193	else {
194	s = "";
195	uid = strdup (_("user ID not found"));
196	}
197	log_box (_("WinPT Verify"), MB_OK,
198	_("%s\n"
199	"%s\n"
200	"Signature made: %s\n"
201	"From \"%s\" using key ID 0x%s"
202	"%s %s"),
203	s, get_gpg_sigstat (sig->summary),
204	strtimestamp (sig->timestamp),
205	uid, keyid+8,
206	novalid? "\nPrimary key fingerprint: " : "",
207	novalid? get_key_fpr (key) : "");
208	safe_free (uid);
209	}
210
211	leave:
212	release_gpg_passphrase_cb (&pwd);
213	gpgme_release (ctx);
214	return err;
215	}