/* -*- 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 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.
*
* 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.
*/
#include "e-passwords.h"
#include <libgnome/gnome-config.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);
void
e_passwords_init ()
{
char *key, *value;
void *iter;
passwords = g_hash_table_new (g_str_hash, g_str_equal);
iter = gnome_config_private_init_iterator ("/Evolution/Passwords");
if (iter) {
while (gnome_config_iterator_next (iter, &key, &value)) {
g_hash_table_insert (passwords,
decode_base64 (key),
decode_base64 (value));
g_free (key);
g_free (value);
}
}
}
static gboolean
free_entry (gpointer key, gpointer value, gpointer user_data)
{
g_free (key);
memset (value, 0, strlen (value));
g_free (value);
return TRUE;
}
void
e_passwords_shutdown ()
{
gnome_config_sync ();
g_hash_table_foreach_remove (passwords, free_entry, NULL);
g_hash_table_destroy (passwords);
passwords = NULL;
}
void
e_passwords_forget_passwords ()
{
g_hash_table_foreach_remove (passwords, free_entry, NULL);
gnome_config_private_clean_section ("/Evolution/Passwords");
gnome_config_sync ();
}
static void
maybe_remember_password (gpointer key, gpointer password, gpointer url)
{
char *path, *key64, *pass64;
int len, state, save;
len = strlen (url);
if (strncmp (key, url, len) != 0)
return;
len = strlen (key);
key64 = g_malloc0 ((len + 2) * 4 / 3 + 1);
state = save = 0;
base64_encode_close (key, len, FALSE, key64, &state, &save);
path = g_strdup_printf ("/Evolution/Passwords/%s", key64);
g_free (key64);
len = strlen (password);
pass64 = g_malloc0 ((len + 2) * 4 / 3 + 1);
state = save = 0;
base64_encode_close (password, len, FALSE, pass64, &state, &save);
gnome_config_private_set_string (path, pass64);
g_free (path);
g_free (pass64);
}
void
e_passwords_remember_password (const char *url)
{
g_hash_table_foreach (passwords, maybe_remember_password, (gpointer)url);
}
void
e_passwords_forget_password (const char *key)
{
gpointer okey, value;
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);
}
}
const char *
e_passwords_get_password (const char *key)
{
return g_hash_table_lookup (passwords, key);
}
void
e_passwords_add_password (const char *key, const char *passwd)
{
g_hash_table_insert (passwords, (gpointer)key, (gpointer)passwd);
}
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;
}
