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/*
Copyright (c) 2010 Samuel Lidén Borell <samuel@slbdata.se>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include <glib.h>
#include <stdlib.h>
#include <string.h>
#include "irc.h"
#include "fish.h"
#include "misc.h"
#include "keystore.h"
static char *keystore_password = NULL;
/**
* Returns the path to the key store file.
*/
static gchar *get_config_filename() {
// TODO use xchat_get_info(ph, "xchatdirfs")
const gchar *homedir = g_get_home_dir();
return g_build_filename(homedir, ".xchat2", "blow.ini", NULL);
}
/**
* Opens the key store file: ~/.xchat2/blow.ini
*/
static GKeyFile *getConfigFile() {
gchar *filename = get_config_filename();
GKeyFile *keyfile = g_key_file_new();
g_key_file_load_from_file(keyfile, filename,
G_KEY_FILE_KEEP_COMMENTS |
G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
g_free(filename);
return keyfile;
}
/**
* Returns the key store password, or the default.
*/
static const char *get_keystore_password() {
return (keystore_password != NULL ?
keystore_password :
// Silly default value...
"blowinikey");
}
/**
* Gets a value for a nick/channel from blow.ini. Unlike
* g_key_file_get_string, this function is case insensitive.
*/
static gchar *get_nick_value(GKeyFile *keyfile, const char *nick, const char *item) {
gchar **group;
gchar **groups = g_key_file_get_groups(keyfile, NULL);
gchar *result = NULL;
for (group = groups; *group != NULL; group++) {
if (!irc_nick_cmp(*group, nick)) {
result = g_key_file_get_string(keyfile, *group, item, NULL);
break;
}
}
g_strfreev(groups);
return result;
}
/**
* Extracts a key from the key store file.
*/
char *keystore_get_key(const char *nick) {
// Get the key
GKeyFile *keyfile = getConfigFile();
gchar *value = get_nick_value(keyfile, nick, "key");
g_key_file_free(keyfile);
if (!value) return NULL;
if (strncmp(value, "+OK ", 4) != 0) {
// Key is stored in plaintext
return import_glib_string(value);
} else {
// Key is encrypted
const char *encrypted = value+4;
const char *password = get_keystore_password();
char *decrypted = fish_decrypt(password, strlen(password), encrypted);
g_free(value);
return decrypted;
}
}
/**
* Deletes a nick and the associated key in the key store file.
*/
static bool delete_nick(GKeyFile *keyfile, const char *nick) {
gchar **group;
gchar **groups = g_key_file_get_groups(keyfile, NULL);
bool ok = false;
for (group = groups; *group != NULL; group++) {
if (!irc_nick_cmp(*group, nick)) {
ok = g_key_file_remove_group(keyfile, *group, NULL);
break;
}
}
g_strfreev(groups);
return ok;
}
/**
* Writes the key store file to disk.
*/
static bool save_keystore(GKeyFile *keyfile) {
char *filename;
bool ok;
// Serialize
gsize file_length;
gchar *file_data = g_key_file_to_data(keyfile, &file_length, NULL);
if (!file_data) return false;
// Write to file
filename = get_config_filename();
ok = g_file_set_contents(filename, file_data, file_length, NULL);
g_free(filename);
g_free(file_data);
return ok;
}
/**
* Sets a key in the key store file.
*/
bool keystore_store_key(const char *nick, const char *key) {
const char *password;
char *encrypted;
char *wrapped;
bool ok = false;
GKeyFile *keyfile = getConfigFile();
// Remove old key
delete_nick(keyfile, nick);
// Add new key
password = get_keystore_password();
if (password) {
// Encrypt the password
encrypted = fish_encrypt(password, strlen(password), key);
if (!encrypted) goto end;
// Prepend "OK+ "
wrapped = g_strconcat("OK+ ", encrypted, NULL);
g_free(encrypted);
// Store encrypted in file
g_key_file_set_string(keyfile, nick, "key", wrapped);
free(wrapped);
} else {
// Store unencrypted in file
g_key_file_set_string(keyfile, nick, "key", key);
}
// Save key store file
ok = save_keystore(keyfile);
end:
g_key_file_free(keyfile);
return ok;
}
/**
* Deletes a nick from the key store.
*/
bool keystore_delete_nick(const char *nick) {
GKeyFile *keyfile = getConfigFile();
// Delete entry
bool ok = delete_nick(keyfile, nick);
// Save
if (ok) save_keystore(keyfile);
g_key_file_free(keyfile);
return ok;
}
void keystore_secure_free(void *ptr, size_t size) {
secure_erase(ptr, size);
free(ptr);
}
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