trunk/Src/wptPassphraseCB.cpp

/* wptPassphraseCB.cpp - GPGME Passphrase Callback
 *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
 *
 * 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 
 */

#include <windows.h>
#include <ctype.h>
#include <io.h>

#include "../resource.h"
#include "wptNLS.h"
#include "wptW32API.h"
#include "wptVersion.h"
#include "wptGPG.h"
#include "wptCommonCtl.h"
#include "wptContext.h"
#include "wptDlgs.h"
#include "wptUTF8.h"
#include "wptErrors.h"
#include "wptTypes.h"
#include "wptKeyList.h"
#include "wptAgent.h"
#include "wptRegistry.h"


#define item_ctrl_id( cmd ) \
    ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)

#define item_ctrl_id2(cmd) \
    ((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)


/* Dialog procedure for the passphrase callback. */
static BOOL CALLBACK
passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
{    
    static passphrase_cb_s * c;
    gpgme_key_t key;
    const char *id;
    char *info;
    void *ctx = NULL, *item;
    int n;

    switch( msg )  {
    case WM_INITDIALOG:
        c = (passphrase_cb_s *)lparam;
        if (!c)
            BUG (0);
        SetWindowText (dlg, c->title);
        if (c->gpg_cmd == GPG_CMD_DECRYPT) {
            SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,
                _("Encrypted with the following public key(s)") );
            CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );
        }
        else if( c->gpg_cmd == GPG_CMD_SIGN )
            CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
        if (gpgme_op_decrypt_result (c->gpg) != NULL &&
            c->gpg_cmd == GPG_CMD_DECRYPT) {
            gpgme_recipient_t r;
            gpgme_decrypt_result_t res;

            res = gpgme_op_decrypt_result (c->gpg);
            for (r = res->recipients; r; r = r->next) {
                get_pubkey (r->keyid, &key);
                if (key) {
                    char *uid;
                    id = key->uids->uid;
                    if (!id)
                        id = _("Invalid User ID");
                    uid = utf8_to_wincp (id, strlen (id));
                    info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];
                    if (!info)
                        BUG (NULL);
                    sprintf (info, "%s (%s, 0x%s)", uid,
                             get_key_pubalgo (r->pubkey_algo), r->keyid+8);
                    free (uid);
                    free (info);
                }
                else {
                    info = new char [32 + strlen (r->keyid) + 2];
                    if (!info)
                        BUG (NULL);
                    sprintf (info, _("Unknown (key ID 0x%s)"),
                             r->keyid? r->keyid+8 : "????????");
                    free (info);
                }
                listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info);
            }
        }
        SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
                        IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
                        _("Please enter your passphrase") );
        if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
            SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );
            SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );
        }
        else {
            SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );
            SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );
        }
        center_window( dlg, NULL );
        SetForegroundWindow( dlg );
        set_active_window( dlg );
        return FALSE;

        case WM_SYSCOMMAND:
            if( LOWORD( wparam ) == SC_CLOSE ) {
                SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );
                c->cancel = 1;
                EndDialog( dlg, TRUE );
            }
            return FALSE;

        case WM_COMMAND:
            switch( HIWORD( wparam ) ) {
            case BN_CLICKED:
                if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE
                    || LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {
                    HWND hwnd;
                    int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
                    hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
                    SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );
                    SetFocus (hwnd);
                }
            }

            switch (LOWORD (wparam)) {
            case IDOK:  
                /* fixme: the item is even cached when the passphrase is not
                          correct, which means that the user needs to delete all
                          cached entries to continue. */
                if (c->pwd) {
                    delete []c->pwd;
                    c->pwd = NULL;
                }
                n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
                if (!n) {
                    c->pwd = new char[2];
                    strcpy (c->pwd, "");
                }
                else {
                    c->pwd = new char[n+1];
                    if (!c->pwd)
                        BUG (NULL);
                    GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);
                }
                if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {
                    if (agent_get_cache (c->keyid, &item))
                        agent_unlock_cache_entry (&item);
                    else
                        agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
                }
                EndDialog (dlg, TRUE);
                return TRUE;
                
            case IDCANCEL:
                SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );
                c->cancel = 1;
                EndDialog (dlg, FALSE);
                return FALSE;
            }
            break;
    }
    
    return FALSE;
}


/* Extract the main keyid from @pass_info.
   Return value: long main keyid or NULL for an error. */
static const char*
parse_gpg_keyid (const char *pass_info)
{
    static char keyid[16+1];
    
    if (strlen (pass_info) < 16)
        return NULL;
    /* the format of the desc buffer looks like this:
       request_keyid[16] main_keyid[16] keytype[1] keylength[4]
       we use the main keyid to use only one cache entry. */
    strncpy (keyid, pass_info+17, 16);
    keyid[16] = 0;
    return keyid;
}


/* Parse the information in @uid_hint and @pass_info to generate
   a input message for the user in @desc. */
static void
parse_gpg_description (const char *uid_hint, const char *pass_info,
                       char *desc, int size)
{
    gpgme_pubkey_algo_t algo;
    char usedkey[16+1], mainkey[16+1];
    char *uid, *p;
    int n=0;

    while (p = strsep ((char**)&pass_info, " ")) {
        switch (n++) {
        case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
        case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
        case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
        }
    }
    uid_hint += 16; /* skip keyid */
    uid_hint += 1;  /* space */

    uid = utf8_to_wincp (uid_hint, strlen (uid_hint));

    if (strcmp (usedkey, mainkey))
        _snprintf (desc, size-1, 
                   _("You need a passphrase to unlock the secret key for\n"
                     "user: \"%s\"\n"
                     "%s key, ID %s (main key ID %s)\n"),
                   uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
    else if (!strcmp (usedkey, mainkey))
        _snprintf (desc, size-1,
                   _("You need a passphrase to unlock the secret key for\n"
                     "user: \"%s\"\n"
                     "%s key, ID %s\n"),
                     uid, get_key_pubalgo (algo), usedkey+8);
    free (uid);
}


static int inline
is_hexstring (const char * p)
{
    size_t i;

    for (i=0; i < strlen (p); i++) {
        if (!isxdigit (p[i]))
            return -1;
    }
    return 0;
}


/* Passphrase callback with the ability to support caching. */
gpgme_error_t
passphrase_cb (void *hook, const char *uid_hint,
               const char *passphrase_info,
               int prev_was_bad, int fd)
{
    passphrase_cb_s *c = (passphrase_cb_s*)hook;
    void *item;
    const char *keyid, *pass;
    int rc;

    if (!c)
        return gpg_error (GPG_ERR_INV_ARG);

    if (passphrase_info) {
        keyid = parse_gpg_keyid (passphrase_info);
        pass = agent_get_cache (keyid, &item);
        if (pass) {
            agent_unlock_cache_entry (&item);
            c->pwd_init = 0;
            write (fd, pass, strlen (pass));
            write (fd, "\n", 1);
            return 0;
        }
    }

    if (c->pwd_init) {
        if (keyid && strlen (keyid) == 16)
            strcpy (c->keyid, keyid+8);

        /* if the desc has a length of 32 and only hex digits, we assume a 
           smart card has been used. */ 
        if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {
            char buf[16];
            memset (buf, 0, sizeof buf);
            strncpy (buf, uid_hint+20, 8);
            _snprintf (c->info, sizeof c->info-1,
                       _("Please enter the PIN to unlock your secret card key\n"
                         "Card: %s"), buf);
            c->is_card = 1;
        }
        else if (uid_hint)
            parse_gpg_description (uid_hint, passphrase_info, 
                                   c->info, sizeof c->info - 1);
        if (c->gpg_cmd == GPG_CMD_DECRYPT) {
            rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
                                 (HWND)c->hwnd, passphrase_callback_proc,
                                 (LPARAM)c);
        }
        else if (c->gpg_cmd == GPG_CMD_SIGN) {
            rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
                                 (HWND)c->hwnd, passphrase_callback_proc,
                                 (LPARAM)c);
        }
        if (rc == -1) {
            write (fd, "\n", 1);
            return gpg_error (GPG_ERR_EOF);
        }
        c->pwd_init = 0;
    }
    if (c->cancel) {
        write (fd, "\n", 1);
        return gpg_error (GPG_ERR_EOF);
    }

    write (fd, c->pwd, strlen (c->pwd));
    write (fd, "\n", 1);
    return 0;
}


/* Initialize the given passphrase callback @cb with the
   used gpgme context @ctx, the command @cmd and a title
   @title for the dialog. */
void
set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx, 
                       int cmd, HWND hwnd, const char *title)
{
    memset (cb, 0, sizeof *cb);
    cb->gpg_cmd = cmd;
    cb->is_card = 0;
    cb->cancel = 0;
    cb->hwnd = hwnd;
    cb->pwd_init = 1;
    free_if_alloc (cb->title);
    cb->title = m_strdup (title);
    if (!cb->title)
        BUG (NULL);
    gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
    cb->gpg = ctx;
}


/* Release a passphrase callback @ctx. */
void
release_gpg_passphrase_cb (passphrase_cb_s *ctx)
{
    if (!ctx)
        return;
    sfree_if_alloc (ctx->pwd);
    free_if_alloc (ctx->title);
}

/* Simple check to measure passphrase (@pass) quality.
   Return value: 0 on success. */
int
check_passwd_quality (const char *pass, int strict)
{
    int i, nd=0, nc=0, n;

    n = strlen (pass);
    if (n < 8)
        return -1;

    for (i=0; i < n; i++) {
        if (isdigit (pass[i])) nd++;
        if (isalpha (pass[i])) nc++;
    }

    if (nd == n || nc == n)
        return -1;

    return 0;
}
1	twoaday	2	/* wptPassphraseCB.cpp - GPGME Passphrase Callback
2	twoaday	23	* Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz
3	twoaday	2	*
4			* This file is part of WinPT.
5			*
6			* WinPT is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* WinPT is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with WinPT; if not, write to the Free Software Foundation,
18			* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include <windows.h>
22			#include <ctype.h>
23	twoaday	23	#include <io.h>
24	twoaday	2
25			#include "../resource.h"
26			#include "wptNLS.h"
27			#include "wptW32API.h"
28			#include "wptVersion.h"
29			#include "wptGPG.h"
30			#include "wptCommonCtl.h"
31			#include "wptContext.h"
32			#include "wptDlgs.h"
33			#include "wptUTF8.h"
34			#include "wptErrors.h"
35			#include "wptTypes.h"
36	twoaday	23	#include "wptKeyList.h"
37	twoaday	2	#include "wptAgent.h"
38			#include "wptRegistry.h"
39
40
41			#define item_ctrl_id( cmd ) \
42			((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_PWD : IDC_DECRYPT_SIGN_PWD)
43
44	twoaday	22	#define item_ctrl_id2(cmd) \
45			((cmd) == GPG_CMD_DECRYPT? IDC_DECRYPT_HIDE : IDC_DECRYPT_SIGN_HIDE)
46	twoaday	2
47	twoaday	22
48	twoaday	23	/* Dialog procedure for the passphrase callback. */
49			static BOOL CALLBACK
50	twoaday	4	passphrase_callback_proc (HWND dlg, UINT msg, WPARAM wparam, LPARAM lparam)
51	twoaday	2	{
52			static passphrase_cb_s * c;
53			gpgme_key_t key;
54	twoaday	23	const char *id;
55			char *info;
56			void ctx = NULL, item;
57			int n;
58	twoaday	2
59			switch( msg ) {
60			case WM_INITDIALOG:
61			c = (passphrase_cb_s *)lparam;
62	twoaday	4	if (!c)
63			BUG (0);
64			SetWindowText (dlg, c->title);
65			if (c->gpg_cmd == GPG_CMD_DECRYPT) {
66	twoaday	2	SetDlgItemText( dlg, IDC_DECRYPT_LISTINF,
67			_("Encrypted with the following public key(s)") );
68			CheckDlgButton( dlg, IDC_DECRYPT_HIDE, BST_CHECKED );
69			}
70			else if( c->gpg_cmd == GPG_CMD_SIGN )
71	twoaday	23	CheckDlgButton (dlg, IDC_DECRYPT_SIGN_HIDE, BST_CHECKED);
72			if (gpgme_op_decrypt_result (c->gpg) != NULL &&
73			c->gpg_cmd == GPG_CMD_DECRYPT) {
74			gpgme_recipient_t r;
75			gpgme_decrypt_result_t res;
76
77			res = gpgme_op_decrypt_result (c->gpg);
78			for (r = res->recipients; r; r = r->next) {
79			get_pubkey (r->keyid, &key);
80			if (key) {
81			char *uid;
82			id = key->uids->uid;
83			if (!id)
84	twoaday	2	id = _("Invalid User ID");
85	twoaday	23	uid = utf8_to_wincp (id, strlen (id));
86			info = new char [8+strlen (uid) + 4 + strlen (r->keyid) + 2];
87			if (!info)
88			BUG (NULL);
89			sprintf (info, "%s (%s, 0x%s)", uid,
90			get_key_pubalgo (r->pubkey_algo), r->keyid+8);
91			free (uid);
92			free (info);
93	twoaday	2	}
94	twoaday	23	else {
95			info = new char [32 + strlen (r->keyid) + 2];
96			if (!info)
97			BUG (NULL);
98			sprintf (info, _("Unknown (key ID 0x%s)"),
99			r->keyid? r->keyid+8 : "????????");
100			free (info);
101			}
102			listbox_add_string (GetDlgItem( dlg, IDC_DECRYPT_LIST ), info);
103	twoaday	2	}
104			}
105			SetDlgItemText( dlg, c->gpg_cmd == GPG_CMD_DECRYPT?
106			IDC_DECRYPT_PWDINFO : IDC_DECRYPT_SIGN_PWDINFO,
107			_("Please enter your passphrase") );
108			if( c->gpg_cmd == GPG_CMD_DECRYPT ) {
109			SetFocus( GetDlgItem( dlg, IDC_DECRYPT_PWD ) );
110			SetDlgItemText( dlg, IDC_DECRYPT_MSG, c->info );
111			}
112			else {
113			SetFocus( GetDlgItem( dlg, IDC_DECRYPT_SIGN_PWD ) );
114			SetDlgItemText( dlg, IDC_DECRYPT_SIGN_MSG, c->info );
115			}
116	twoaday	23	center_window( dlg, NULL );
117	twoaday	2	SetForegroundWindow( dlg );
118			set_active_window( dlg );
119			return FALSE;
120
121			case WM_SYSCOMMAND:
122			if( LOWORD( wparam ) == SC_CLOSE ) {
123			SetDlgItemText( dlg, item_ctrl_id( c->gpg_cmd ), "" );
124			c->cancel = 1;
125			EndDialog( dlg, TRUE );
126			}
127			return FALSE;
128
129			case WM_COMMAND:
130			switch( HIWORD( wparam ) ) {
131			case BN_CLICKED:
132			if ( LOWORD( wparam ) == IDC_DECRYPT_HIDE
133			\|\| LOWORD( wparam ) == IDC_DECRYPT_SIGN_HIDE ) {
134			HWND hwnd;
135	twoaday	22	int hide = IsDlgButtonChecked (dlg, item_ctrl_id2 (c->gpg_cmd));
136			hwnd = GetDlgItem (dlg, item_ctrl_id (c->gpg_cmd));
137	twoaday	4	SendMessage( hwnd, EM_SETPASSWORDCHAR, hide? '*' : 0, 0 );
138	twoaday	22	SetFocus (hwnd);
139	twoaday	2	}
140			}
141
142	twoaday	4	switch (LOWORD (wparam)) {
143			case IDOK:
144	twoaday	2	/* fixme: the item is even cached when the passphrase is not
145			correct, which means that the user needs to delete all
146			cached entries to continue. */
147	twoaday	23	if (c->pwd) {
148			delete []c->pwd;
149			c->pwd = NULL;
150			}
151			n = item_get_text_length (dlg, item_ctrl_id (c->gpg_cmd));
152			if (!n) {
153			c->pwd = new char[2];
154			strcpy (c->pwd, "");
155			}
156			else {
157			c->pwd = new char[n+1];
158			if (!c->pwd)
159			BUG (NULL);
160			GetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), c->pwd, sizeof (c->pwd) -1);
161			}
162	twoaday	4	if (reg_prefs.cache_time > 0 && !c->is_card && !strstr (c->keyid, "missing")) {
163			if (agent_get_cache (c->keyid, &item))
164			agent_unlock_cache_entry (&item);
165	twoaday	2	else
166	twoaday	4	agent_put_cache (c->keyid, c->pwd, reg_prefs.cache_time);
167	twoaday	2	}
168	twoaday	4	EndDialog (dlg, TRUE);
169	twoaday	2	return TRUE;
170
171			case IDCANCEL:
172	twoaday	4	SetDlgItemText (dlg, item_ctrl_id (c->gpg_cmd), "" );
173	twoaday	2	c->cancel = 1;
174	twoaday	4	EndDialog (dlg, FALSE);
175	twoaday	2	return FALSE;
176			}
177			break;
178			}
179
180			return FALSE;
181	twoaday	23	}
182	twoaday	2
183
184	twoaday	23	/* Extract the main keyid from @pass_info.
185			Return value: long main keyid or NULL for an error. */
186			static const char*
187			parse_gpg_keyid (const char *pass_info)
188	twoaday	2	{
189			static char keyid[16+1];
190
191	twoaday	23	if (strlen (pass_info) < 16)
192	twoaday	2	return NULL;
193			/* the format of the desc buffer looks like this:
194			request_keyid[16] main_keyid[16] keytype[1] keylength[4]
195			we use the main keyid to use only one cache entry. */
196	twoaday	23	strncpy (keyid, pass_info+17, 16);
197			keyid[16] = 0;
198	twoaday	2	return keyid;
199	twoaday	23	}
200	twoaday	2
201
202	twoaday	23	/* Parse the information in @uid_hint and @pass_info to generate
203			a input message for the user in @desc. */
204	twoaday	2	static void
205	twoaday	23	parse_gpg_description (const char uid_hint, const char pass_info,
206			char *desc, int size)
207	twoaday	2	{
208	twoaday	23	gpgme_pubkey_algo_t algo;
209			char usedkey[16+1], mainkey[16+1];
210			char uid, p;
211			int n=0;
212	twoaday	2
213	twoaday	23	while (p = strsep ((char**)&pass_info, " ")) {
214			switch (n++) {
215			case 0: strncpy (mainkey, p, 16); mainkey[16] = 0; break;
216			case 1: strncpy (usedkey, p, 16); usedkey[16] = 0; break;
217			case 2: algo = (gpgme_pubkey_algo_t)atol (p); break;
218	twoaday	2	}
219			}
220	twoaday	23	uid_hint += 16; /* skip keyid */
221			uid_hint += 1; /* space */
222	twoaday	2
223	twoaday	23	uid = utf8_to_wincp (uid_hint, strlen (uid_hint));
224	twoaday	2
225	twoaday	23	if (strcmp (usedkey, mainkey))
226			_snprintf (desc, size-1,
227	twoaday	2	_("You need a passphrase to unlock the secret key for\n"
228			"user: \"%s\"\n"
229			"%s key, ID %s (main key ID %s)\n"),
230	twoaday	23	uid, get_key_pubalgo (algo), usedkey+8, mainkey+8);
231			else if (!strcmp (usedkey, mainkey))
232			_snprintf (desc, size-1,
233	twoaday	2	_("You need a passphrase to unlock the secret key for\n"
234			"user: \"%s\"\n"
235			"%s key, ID %s\n"),
236	twoaday	23	uid, get_key_pubalgo (algo), usedkey+8);
237			free (uid);
238			}
239	twoaday	2
240
241			static int inline
242	twoaday	23	is_hexstring (const char * p)
243	twoaday	2	{
244			size_t i;
245	twoaday	23
246			for (i=0; i < strlen (p); i++) {
247			if (!isxdigit (p[i]))
248	twoaday	2	return -1;
249			}
250			return 0;
251			}
252
253
254	twoaday	23	/* Passphrase callback with the ability to support caching. */
255			gpgme_error_t
256			passphrase_cb (void hook, const char uid_hint,
257			const char *passphrase_info,
258			int prev_was_bad, int fd)
259			{
260			passphrase_cb_s c = (passphrase_cb_s)hook;
261			void *item;
262			const char keyid, pass;
263			int rc;
264	twoaday	2
265	twoaday	23	if (!c)
266			return gpg_error (GPG_ERR_INV_ARG);
267	twoaday	2
268	twoaday	23	if (passphrase_info) {
269			keyid = parse_gpg_keyid (passphrase_info);
270			pass = agent_get_cache (keyid, &item);
271			if (pass) {
272			agent_unlock_cache_entry (&item);
273	twoaday	2	c->pwd_init = 0;
274	twoaday	23	write (fd, pass, strlen (pass));
275			write (fd, "\n", 1);
276			return 0;
277	twoaday	2	}
278			}
279
280	twoaday	23	if (c->pwd_init) {
281			if (keyid && strlen (keyid) == 16)
282			strcpy (c->keyid, keyid+8);
283
284	twoaday	2	/* if the desc has a length of 32 and only hex digits, we assume a
285			smart card has been used. */
286	twoaday	23	if (uid_hint && strlen (uid_hint) == 32 && !is_hexstring (uid_hint)) {
287	twoaday	2	char buf[16];
288	twoaday	23	memset (buf, 0, sizeof buf);
289			strncpy (buf, uid_hint+20, 8);
290			_snprintf (c->info, sizeof c->info-1,
291			_("Please enter the PIN to unlock your secret card key\n"
292			"Card: %s"), buf);
293	twoaday	2	c->is_card = 1;
294			}
295	twoaday	23	else if (uid_hint)
296			parse_gpg_description (uid_hint, passphrase_info,
297			c->info, sizeof c->info - 1);
298			if (c->gpg_cmd == GPG_CMD_DECRYPT) {
299			rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT,
300			(HWND)c->hwnd, passphrase_callback_proc,
301			(LPARAM)c);
302	twoaday	2	}
303	twoaday	23	else if (c->gpg_cmd == GPG_CMD_SIGN) {
304			rc = DialogBoxParam (glob_hinst, (LPCSTR)IDD_WINPT_DECRYPT_SIGN,
305			(HWND)c->hwnd, passphrase_callback_proc,
306			(LPARAM)c);
307	twoaday	2	}
308	twoaday	23	if (rc == -1) {
309			write (fd, "\n", 1);
310			return gpg_error (GPG_ERR_EOF);
311	twoaday	2	}
312			c->pwd_init = 0;
313			}
314	twoaday	23	if (c->cancel) {
315			write (fd, "\n", 1);
316			return gpg_error (GPG_ERR_EOF);
317			}
318	twoaday	2
319	twoaday	23	write (fd, c->pwd, strlen (c->pwd));
320			write (fd, "\n", 1);
321			return 0;
322			}
323	twoaday	2
324
325	twoaday	23	/* Initialize the given passphrase callback @cb with the
326			used gpgme context @ctx, the command @cmd and a title
327			@title for the dialog. */
328			void
329			set_gpg_passphrase_cb (passphrase_cb_s *cb, gpgme_ctx_t ctx,
330			int cmd, HWND hwnd, const char *title)
331			{
332			memset (cb, 0, sizeof *cb);
333			cb->gpg_cmd = cmd;
334			cb->is_card = 0;
335			cb->cancel = 0;
336			cb->hwnd = hwnd;
337			cb->pwd_init = 1;
338			free_if_alloc (cb->title);
339			cb->title = m_strdup (title);
340			if (!cb->title)
341			BUG (NULL);
342			gpgme_set_passphrase_cb (ctx, passphrase_cb, cb);
343			cb->gpg = ctx;
344			}
345	twoaday	2
346	twoaday	23
347			/* Release a passphrase callback @ctx. */
348	twoaday	2	void
349	twoaday	23	release_gpg_passphrase_cb (passphrase_cb_s *ctx)
350	twoaday	2	{
351	twoaday	23	if (!ctx)
352			return;
353			sfree_if_alloc (ctx->pwd);
354			free_if_alloc (ctx->title);
355			}
356	twoaday	22
357	twoaday	23	/* Simple check to measure passphrase (@pass) quality.
358			Return value: 0 on success. */
359	twoaday	22	int
360			check_passwd_quality (const char *pass, int strict)
361			{
362			int i, nd=0, nc=0, n;
363
364			n = strlen (pass);
365			if (n < 8)
366			return -1;
367
368			for (i=0; i < n; i++) {
369			if (isdigit (pass[i])) nd++;
370			if (isalpha (pass[i])) nc++;
371			}
372
373			if (nd == n \|\| nc == n)
374			return -1;
375
376			return 0;
377			}