aboutsummaryrefslogtreecommitdiffstats
path: root/e-util/e-passwords.c
blob: 124772cac4b9b7e1bdf55a86bfa2394f950e697d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 * e-passwords.c
 *
 * Copyright (C) 2001 Ximian, Inc.
 */

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 * 
 * 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; 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 "e-passwords.h"
#include <string.h>
#include <libgnome/gnome-config.h>
#include <libgnome/gnome-i18n.h>
#include <gtk/gtkentry.h>
#include <gtk/gtkbox.h>
#include <gtk/gtkcheckbutton.h>
#include <gtk/gtkmessagedialog.h>

static char *decode_base64 (char *base64);

static GHashTable *passwords = NULL;

static int base64_encode_close(unsigned char *in, int inlen, gboolean break_lines, unsigned char *out, int *state, int *save);
static int base64_encode_step(unsigned char *in, int len, gboolean break_lines, unsigned char *out, int *state, int *save);

/**
 * e_passwords_init:
 *
 * Initializes the e_passwords routines. Must be called before any other
 * e_passwords_* function.
 **/
static void
e_passwords_init ()
{
    if (passwords)
        return;

    /* create the per-session hash table */
    passwords = g_hash_table_new (g_str_hash, g_str_equal);
}

static gboolean
free_entry (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    memset (value, 0, strlen (value));
    g_free (value);
    return TRUE;
}

/**
 * e_passwords_shutdown:
 *
 * Cleanup routine to call before exiting.
 **/
void
e_passwords_shutdown ()
{
    /* shouldn't need this really - everything is synchronous */
    gnome_config_private_sync_file ("/Evolution");

    if (passwords) {
        /* and destroy our per session hash */
        g_hash_table_foreach_remove (passwords, free_entry, NULL);
        g_hash_table_destroy (passwords);
        passwords = NULL;
    }
}


/**
 * e_passwords_forget_passwords:
 *
 * Forgets all cached passwords, in memory and on disk.
 **/
void
e_passwords_forget_passwords ()
{
    void *it;
    char *key;

    e_passwords_init ();

    it = gnome_config_private_init_iterator_sections("/Evolution");
    while ( (it = gnome_config_iterator_next(it, &key, NULL)) ) {
        if (0 == strncmp(key, "Passwords-", 10)) {
            char *section = g_strdup_printf("/Evolution/%s", key);

            gnome_config_private_clean_section (section);
            g_free(section);
        }
        g_free(key);
    }

    /*gnome_config_private_clean_section ("/Evolution/Passwords-Mail");*/
    gnome_config_private_sync_file ("/Evolution");

    /* free up the session passwords */
    g_hash_table_foreach_remove (passwords, free_entry, NULL);
}

/**
 * e_passwords_clear_component_passwords:
 *
 * Forgets all disk cached passwords.
 **/
void
e_passwords_clear_component_passwords (const char *component_name)
{
    char *path;

    e_passwords_init ();

    path = g_strdup_printf ("/Evolution/Passwords-%s", component_name);

    gnome_config_private_clean_section (path);
    gnome_config_private_sync_file ("/Evolution");

    g_free (path);
}

static char *
password_path (const char *component_name, const char *key)
{
    char *keycopy, *path;
    int i;
    keycopy = g_strdup (key);

    for (i = 0; i < strlen (keycopy); i ++)
        if (keycopy[i] == '/' || keycopy[i] =='=')
            keycopy[i] = '_';
    
    path = g_strdup_printf ("/Evolution/Passwords-%s/%s", component_name, keycopy);

    g_free (keycopy);

    return path;
}

/**
 * e_passwords_remember_password:
 * @key: the key
 *
 * Saves the password associated with @key to disk.
 **/
void
e_passwords_remember_password (const char *component_name, const char *key)
{
    gpointer okey, value;
    char *path, *pass64;
    int len, state, save;

    e_passwords_init ();

    if (!g_hash_table_lookup_extended (passwords, key, &okey, &value))
        return;

    /* add it to the on-disk cache of passwords */
    path = password_path (component_name, okey);

    len = strlen (value);
    pass64 = g_malloc0 ((len + 2) * 4 / 3 + 1);
    state = save = 0;
    base64_encode_close (value, len, FALSE, pass64, &state, &save);

    printf ("remembering password for (%s): %s\n", path, pass64);

    gnome_config_private_set_string (path, pass64);
    g_free (path);
    g_free (pass64);

    /* now remove it from our session hash */
    g_hash_table_remove (passwords, key);
    g_free (okey);
    g_free (value);

    gnome_config_private_sync_file ("/Evolution");
}

/**
 * e_passwords_forget_password:
 * @key: the key
 *
 * Forgets the password associated with @key, in memory and on disk.
 **/
void
e_passwords_forget_password (const char *component_name, const char *key)
{
    gpointer okey, value;
    char *path;

    e_passwords_init ();

    if (g_hash_table_lookup_extended (passwords, key, &okey, &value)) {
        g_hash_table_remove (passwords, key);
        memset (value, 0, strlen (value));
        g_free (okey);
        g_free (value);
    }

    /* clear it in the on disk db */
    path = password_path (component_name, key);
    gnome_config_private_clean_key (path);
    gnome_config_private_sync_file ("/Evolution");
    g_free (path);
}

/**
 * e_passwords_get_password:
 * @key: the key
 *
 * Return value: the password associated with @key, or %NULL.  Caller
 * must free the returned password.
 **/
char *
e_passwords_get_password (const char *component_name, const char *key)
{
    char *path, *passwd;
    char *encoded = NULL;

    e_passwords_init ();
    
    passwd = g_hash_table_lookup (passwords, key);
    if (passwd)
        return g_strdup (passwd);
    
    /* not part of the session hash, look it up in the on disk db */
    path = password_path (component_name, key);

    encoded = gnome_config_private_get_string_with_default (path, NULL);
    
    g_free (path);

    if (!encoded)
        return NULL;
    
    passwd = decode_base64 (encoded);
    g_free (encoded);
    
    return passwd;
}

/**
 * e_passwords_add_password:
 * @key: a key
 * @passwd: the password for @key
 *
 * This stores the @key/@passwd pair in the current session's password
 * hash.
 **/
void
e_passwords_add_password (const char *key, const char *passwd)
{
    gpointer okey, value;

    e_passwords_init ();

    /* FIXME: shouldn't this be g_return_if_fail? */
    if (!key || !passwd)
        return;

    if (g_hash_table_lookup_extended (passwords, key, &okey, &value)) {
        g_hash_table_remove (passwords, key);
        g_free (okey);
        g_free (value);
    }

    g_hash_table_insert (passwords, g_strdup (key), g_strdup (passwd));
}


static void
entry_activate (GtkEntry *entry, GtkDialog *dialog)
{
    gtk_dialog_response (dialog, GTK_RESPONSE_OK);
}

/**
 * e_passwords_ask_password:
 * @title: title for the password dialog
 * @component_name: the name of the component for which we're storing
 * the password (e.g. Mail, Addressbook, etc.)
 * @key: key to store the password under
 * @prompt: prompt string
 * @secret: whether or not the password text should be ***ed out
 * @remember_type: whether or not to offer to remember the password,
 * and for how long.
 * @remember: on input, the default state of the remember checkbox.
 * on output, the state of the checkbox when the dialog was closed.
 * @parent: parent window of the dialog, or %NULL
 *
 * Asks the user for a password.
 *
 * Return value: the password, which the caller must free, or %NULL if
 * the user cancelled the operation. *@remember will be set if the
 * return value is non-%NULL and @remember_type is not
 * E_PASSWORDS_DO_NOT_REMEMBER.
 **/
char *
e_passwords_ask_password (const char *title, const char *component_name,
              const char *key,
              const char *prompt, gboolean secret,
              EPasswordsRememberType remember_type,
              gboolean *remember,
              GtkWindow *parent)
{
    GtkWidget *dialog;
    GtkWidget *check = NULL, *entry;
    char *password;
    int response;

    dialog = gtk_message_dialog_new (parent,
                     0,
                     GTK_MESSAGE_QUESTION,
                     GTK_BUTTONS_OK_CANCEL,
                     prompt);

    gtk_window_set_title (GTK_WINDOW (dialog), title);

    gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_OK);

    /* Password entry */
    entry = gtk_entry_new();
    if (secret)
        gtk_entry_set_visibility (GTK_ENTRY(entry), FALSE);

    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), 
                entry, FALSE, FALSE, 4);
    gtk_widget_show (entry);
    gtk_widget_grab_focus (entry);

    g_signal_connect (entry, "activate",
              G_CALLBACK (entry_activate), dialog);

    /* Remember the password? */
    if (remember_type != E_PASSWORDS_DO_NOT_REMEMBER) {
        const char *label;

        if (remember_type == E_PASSWORDS_REMEMBER_FOREVER)
            label = _("Remember this password");
        else
            label = _("Remember this password for the remainder of this session");
        check = gtk_check_button_new_with_label (label);
        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check),
                          *remember);

        gtk_box_pack_end (GTK_BOX (GTK_DIALOG (dialog)->vbox),
                  check, TRUE, FALSE, 4);
        gtk_widget_show (check);
    }

    response = gtk_dialog_run (GTK_DIALOG (dialog));

    if (response == GTK_RESPONSE_OK) {
        password = gtk_editable_get_chars (GTK_EDITABLE (entry), 0, -1);
        if (remember_type != E_PASSWORDS_DO_NOT_REMEMBER) {
            *remember = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (check));

            if (*remember || remember_type == E_PASSWORDS_REMEMBER_FOREVER)
                e_passwords_add_password (key, password);
            if (*remember && remember_type == E_PASSWORDS_REMEMBER_FOREVER)
                e_passwords_remember_password (component_name, key);
        }
    } else
        password = NULL;

    gtk_widget_destroy (dialog);

    return password;
}



static char *base64_alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static unsigned char camel_mime_base64_rank[256] = {
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
     52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255,  0,255,255,
    255,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
    255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
     41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};

/* call this when finished encoding everything, to
   flush off the last little bit */
static int
base64_encode_close(unsigned char *in, int inlen, gboolean break_lines, unsigned char *out, int *state, int *save)
{
    int c1, c2;
    unsigned char *outptr = out;

    if (inlen>0)
        outptr += base64_encode_step(in, inlen, break_lines, outptr, state, save);

    c1 = ((unsigned char *)save)[1];
    c2 = ((unsigned char *)save)[2];
    
    switch (((char *)save)[0]) {
    case 2:
        outptr[2] = base64_alphabet[ ( (c2 &0x0f) << 2 ) ];
        g_assert(outptr[2] != 0);
        goto skip;
    case 1:
        outptr[2] = '=';
    skip:
        outptr[0] = base64_alphabet[ c1 >> 2 ];
        outptr[1] = base64_alphabet[ c2 >> 4 | ( (c1&0x3) << 4 )];
        outptr[3] = '=';
        outptr += 4;
        break;
    }
    if (break_lines)
        *outptr++ = '\n';

    *save = 0;
    *state = 0;

    return outptr-out;
}

/*
  performs an 'encode step', only encodes blocks of 3 characters to the
  output at a time, saves left-over state in state and save (initialise to
  0 on first invocation).
*/
static int
base64_encode_step(unsigned char *in, int len, gboolean break_lines, unsigned char *out, int *state, int *save)
{
    register unsigned char *inptr, *outptr;

    if (len<=0)
        return 0;

    inptr = in;
    outptr = out;

    if (len + ((char *)save)[0] > 2) {
        unsigned char *inend = in+len-2;
        register int c1, c2, c3;
        register int already;

        already = *state;

        switch (((char *)save)[0]) {
        case 1: c1 = ((unsigned char *)save)[1]; goto skip1;
        case 2: c1 = ((unsigned char *)save)[1];
            c2 = ((unsigned char *)save)[2]; goto skip2;
        }
        
        /* yes, we jump into the loop, no i'm not going to change it, it's beautiful! */
        while (inptr < inend) {
            c1 = *inptr++;
        skip1:
            c2 = *inptr++;
        skip2:
            c3 = *inptr++;
            *outptr++ = base64_alphabet[ c1 >> 2 ];
            *outptr++ = base64_alphabet[ c2 >> 4 | ( (c1&0x3) << 4 ) ];
            *outptr++ = base64_alphabet[ ( (c2 &0x0f) << 2 ) | (c3 >> 6) ];
            *outptr++ = base64_alphabet[ c3 & 0x3f ];
            /* this is a bit ugly ... */
            if (break_lines && (++already)>=19) {
                *outptr++='\n';
                already = 0;
            }
        }

        ((char *)save)[0] = 0;
        len = 2-(inptr-inend);
        *state = already;
    }

    if (len>0) {
        register char *saveout;

        /* points to the slot for the next char to save */
        saveout = & (((char *)save)[1]) + ((char *)save)[0];

        /* len can only be 0 1 or 2 */
        switch(len) {
        case 2: *saveout++ = *inptr++;
        case 1: *saveout++ = *inptr++;
        }
        ((char *)save)[0]+=len;
    }

    return outptr-out;
}


/**
 * base64_decode_step: decode a chunk of base64 encoded data
 * @in: input stream
 * @len: max length of data to decode
 * @out: output stream
 * @state: holds the number of bits that are stored in @save
 * @save: leftover bits that have not yet been decoded
 *
 * Decodes a chunk of base64 encoded data
 **/
static int
base64_decode_step(unsigned char *in, int len, unsigned char *out, int *state, unsigned int *save)
{
    register unsigned char *inptr, *outptr;
    unsigned char *inend, c;
    register unsigned int v;
    int i;

    inend = in+len;
    outptr = out;

    /* convert 4 base64 bytes to 3 normal bytes */
    v=*save;
    i=*state;
    inptr = in;
    while (inptr<inend) {
        c = camel_mime_base64_rank[*inptr++];
        if (c != 0xff) {
            v = (v<<6) | c;
            i++;
            if (i==4) {
                *outptr++ = v>>16;
                *outptr++ = v>>8;
                *outptr++ = v;
                i=0;
            }
        }
    }

    *save = v;
    *state = i;

    /* quick scan back for '=' on the end somewhere */
    /* fortunately we can drop 1 output char for each trailing = (upto 2) */
    i=2;
    while (inptr>in && i) {
        inptr--;
        if (camel_mime_base64_rank[*inptr] != 0xff) {
            if (*inptr == '=')
                outptr--;
            i--;
        }
    }

    /* if i!= 0 then there is a truncation error! */
    return outptr-out;
}

static char *
decode_base64 (char *base64)
{
    char *plain, *pad = "==";
    int len, out, state, save;
    
    len = strlen (base64);
    plain = g_malloc0 (len);
    state = save = 0;
    out = base64_decode_step (base64, len, plain, &state, &save);
    if (len % 4) {
        base64_decode_step (pad, 4 - len % 4, plain + out,
                    &state, &save);
    }
    
    return plain;
}