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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2018 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gi18n.h>
#include "prefs_common.h"
#include "ssl.h"
#include "utils.h"
#include "masterpassword.h"
gchar *master_password;
gboolean master_password_enabled_on_init;
void set_master_password(const char *password) {
master_password = password;
}
gchar *get_master_password(void) {
return master_password;
}
void cleanse_buffer(void *buf, size_t len) {
#if USE_SSL
OPENSSL_cleanse(buf, len);
#else
memset(buf, 0, len); /* better than nothing */
#endif
}
void unload_master_password(void) {
debug_print("Unloading master password\n");
if (master_password == NULL) {
/* not loaded / already unloaded */
return;
}
cleanse_buffer(master_password, strlen(master_password));
g_free(master_password);
master_password = NULL;
debug_print("Master password unloaded\n");
}
gint mpes_string_prefix(const gchar *str) {
/* this function will be expanded in time as the format changes */
if (g_str_has_prefix(str, "mpes1:"))
return 6;
return 0;
}
gboolean master_password_active(void) {
#if USE_SSL
return ((master_password != NULL) &&
prefs_common.use_master_password);
#else
return FALSE;
#endif
}
gchar *decrypt_with_master_password(const gchar *str) {
#if USE_SSL
gchar *new_str;
gint str_prefix;
if ((!str) || (!prefs_common.use_master_password))
return g_strdup(str);
if (master_password == NULL) {
/* we have empty or auto unloaded master password */
if ((!prefs_common.auto_unload_master_password) ||
(check_master_password_interactively(3) != MP_RC_OK)) {
return g_strdup(str);
}
debug_print("Reloaded master password\n");
}
str_prefix = mpes_string_prefix(str);
if (!str_prefix)
return g_strdup(str);
if (decrypt_data(&new_str,
str + str_prefix,
master_password,
strlen(str) + 1 - str_prefix) != MP_RC_OK) {
OPENSSL_cleanse(new_str, strlen(new_str));
g_free(new_str);
return g_strdup(str);
}
return new_str;
#else
return g_strdup(str);
#endif
}
gchar *encrypt_with_master_password(const gchar *str) {
#if USE_SSL
gchar *new_str, *mpes1_str;
gint length_encrypted;
if ((!str) || (!master_password_active()))
return NULL;
/*
* unlike the decrypt function, here it is up to the caller
* to make sure that auto unloaded master password is handled properly
*/
if (encrypt_data(&new_str,
&length_encrypted,
str,
master_password,
strlen(str) + 1,
prefs_common.encrypted_password_min_length,
TRUE) != MP_RC_OK) {
g_free(new_str);
return NULL;
}
mpes1_str = g_strdup_printf("mpes1:%s", new_str);
g_free(new_str);
return mpes1_str;
#else
return NULL;
#endif
}
#if USE_SSL
gint set_master_password_interactively(guint max_attempts) {
if (master_password == NULL)
master_password = input_set_new_password(max_attempts);
if (master_password == NULL)
return 1;
if (generate_password_hash(
&prefs_common.master_password_hash,
master_password,
NULL) != MP_RC_OK) {
/* should not really happen unless buggy code / library */
g_free(prefs_common.master_password_hash);
prefs_common.master_password_hash = NULL;
debug_print(_("Could not generate master password hash"));
return 1;
}
prefs_common_write_config();
return 0;
}
gint check_master_password_interactively(guint max_attempts) {
guint cnt;
g_return_val_if_fail(max_attempts > 0, 1);
g_return_val_if_fail(prefs_common.master_password_hash != NULL, 1);
if (master_password != NULL) {
/* password already cached */
debug_print("Master password already cached\n");
return check_password(master_password,
prefs_common.master_password_hash);
}
for (cnt = 0; cnt < max_attempts; ++cnt) {
master_password = input_query_master_password();
if (master_password == NULL) {
/* input canceled or query_master_password_func not set */
continue;
}
if (check_password(master_password,
prefs_common.master_password_hash) == MP_RC_OK) {
return MP_RC_OK; /* match */
}
debug_print(_("Wrong master password entered (%d)\n"), cnt);
OPENSSL_cleanse(master_password, strlen(master_password));
g_free(master_password);
master_password = NULL;
}
return 1; /* no match */
}
#endif /* USE_SSL */
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