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db-misc.c
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db-misc.c
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#include <gtk/gtk.h>
#include <gcrypt.h>
#include <jansson.h>
#include <glib/gstdio.h>
#include <glib/gi18n.h>
#include "db-misc.h"
#include "otpclient.h"
#include "file-size.h"
#include "gquarks.h"
#include "common/common.h"
typedef struct header_data_t {
guint8 iv[IV_SIZE];
guint8 salt[KDF_SALT_SIZE];
} HeaderData;
static void reload_db (DatabaseData *db_data, GError **err);
static void update_db (DatabaseData *db_data, GError **err);
static gpointer encrypt_db (const gchar *db_path, const gchar *in_memory_json, const gchar *password, GError **err);
static inline void add_to_json (gpointer list_elem, gpointer json_array);
static gchar *decrypt_db (const gchar *db_path, const gchar *password);
static guchar *get_derived_key (const gchar *pwd, HeaderData *header_data);
static void backup_db (const gchar *path);
static void restore_db (const gchar *path);
static inline void json_free (gpointer data);
static void cleanup (GFile *, gpointer, HeaderData *, GError *);
void
load_db (DatabaseData *db_data,
GError **err)
{
if (!g_file_test (db_data->db_path, G_FILE_TEST_EXISTS)) {
g_set_error (err, missing_file_gquark (), MISSING_FILE_CODE, "Missing database file");
db_data->json_data = NULL;
return;
}
gchar *in_memory_json = decrypt_db (db_data->db_path, db_data->key);
if (in_memory_json == TAG_MISMATCH) {
g_set_error (err, bad_tag_gquark (), BAD_TAG_ERRCODE, "Either the file is corrupted or the password is wrong");
return;
} else if (in_memory_json == KEY_DERIV_ERR) {
g_set_error (err, key_deriv_gquark (), KEY_DERIVATION_ERRCODE, "Error during key derivation");
return;
} else if (in_memory_json == GENERIC_ERROR) {
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "An error occurred, please check stderr");
return;
}
json_error_t jerr;
db_data->json_data = json_loads (in_memory_json, 0, &jerr);
gcry_free (in_memory_json);
if (db_data->json_data == NULL) {
gchar *msg = g_strconcat ("Error while loading json data: ", jerr.text, NULL);
g_set_error (err, memlock_error_gquark(), MEMLOCK_ERRCODE, "%s", msg);
return;
}
gsize index;
json_t *obj;
json_array_foreach (db_data->json_data, index, obj) {
guint32 hash = json_object_get_hash (obj);
db_data->objects_hash = g_slist_append (db_data->objects_hash, g_memdup2 (&hash, sizeof (guint32)));
}
}
void
update_and_reload_db (AppData *app_data,
DatabaseData *db_data,
gboolean regenerate_model,
GError **err)
{
update_db (db_data, err);
if (*err != NULL && !g_error_matches (*err, missing_file_gquark (), MISSING_FILE_CODE)) {
g_printerr ("%s\n", (*err)->message);
return;
}
reload_db (db_data, err);
if (*err != NULL && !g_error_matches (*err, missing_file_gquark (), MISSING_FILE_CODE)) {
g_printerr ("%s\n", (*err)->message);
return;
}
#ifdef BUILD_GUI
if (regenerate_model) {
update_model (app_data);
g_slist_free_full (app_data->db_data->data_to_add, json_free);
app_data->db_data->data_to_add = NULL;
}
#endif
}
void
load_new_db (AppData *app_data,
GError **err)
{
reload_db (app_data->db_data, err);
if (*err != NULL) {
return;
}
#ifdef BUILD_GUI
update_model (app_data);
g_slist_free_full (app_data->db_data->data_to_add, json_free);
app_data->db_data->data_to_add = NULL;
#endif
}
gint
check_duplicate (gconstpointer data,
gconstpointer user_data)
{
guint list_elem = *(guint *)data;
if (list_elem == GPOINTER_TO_UINT(user_data)) {
return 0;
}
return -1;
}
void write_db_to_disk (DatabaseData *db_data,
GError **err)
{
update_db (db_data, err);
}
static void
reload_db (DatabaseData *db_data,
GError **err)
{
if (db_data->json_data != NULL) {
json_decref (db_data->json_data);
}
g_slist_free_full (db_data->objects_hash, g_free);
db_data->objects_hash = NULL;
load_db (db_data, err);
}
static void
update_db (DatabaseData *db_data,
GError **err)
{
gboolean first_run = (db_data->json_data == NULL) ? TRUE : FALSE;
if (first_run == TRUE) {
db_data->json_data = json_array ();
} else {
// database is backed-up only if this is not the first run
backup_db (db_data->db_path);
}
g_slist_foreach (db_data->data_to_add, add_to_json, db_data->json_data);
gchar *plain_data = json_dumps (db_data->json_data, JSON_COMPACT);
if (encrypt_db (db_data->db_path, plain_data, db_data->key, err) != NULL) {
if (!first_run) {
g_printerr ("Encrypting the new data failed, restoring original copy...\n");
restore_db (db_data->db_path);
} else {
g_printerr ("Couldn't update the database (encrypt_db failed)\n");
if (g_file_test (db_data->db_path, G_FILE_TEST_EXISTS)) {
if (g_unlink (db_data->db_path) == -1) {
g_printerr ("%s\n", _("Error while unlinking the file."));
}
}
}
} else {
// database must be backed-up both before and after the update
backup_db (db_data->db_path);
}
gcry_free (plain_data);
}
static inline void
add_to_json (gpointer list_elem,
gpointer json_array)
{
json_array_append (json_array, json_deep_copy (list_elem));
}
static gpointer
encrypt_db (const gchar *db_path,
const gchar *in_memory_json,
const gchar *password,
GError **err)
{
GError *local_err = NULL;
HeaderData *header_data = g_new0 (HeaderData, 1);
gcry_create_nonce (header_data->iv, IV_SIZE);
gcry_create_nonce (header_data->salt, KDF_SALT_SIZE);
GFile *out_file = g_file_new_for_path (db_path);
GFileOutputStream *out_stream = g_file_replace (out_file, NULL, FALSE, G_FILE_CREATE_REPLACE_DESTINATION, NULL, &local_err);
if (local_err != NULL) {
g_printerr ("%s\n", local_err->message);
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "Failed to replace existing file");
cleanup (out_file, NULL, header_data, local_err);
return GENERIC_ERROR;
}
if (g_output_stream_write (G_OUTPUT_STREAM (out_stream), header_data, sizeof (HeaderData), NULL, &local_err) == -1) {
g_printerr ("%s\n", local_err->message);
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "Failed while writing header data to file");
cleanup (out_file, out_stream, header_data, local_err);
return GENERIC_ERROR;
}
guchar *derived_key = get_derived_key (password, header_data);
if (derived_key == SECURE_MEMORY_ALLOC_ERR || derived_key == KEY_DERIV_ERR) {
cleanup (out_file, out_stream, header_data, local_err);
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "Failed to derive key.\nPlease check <a href=\"https://github.com/paolostivanin/OTPClient/wiki/Secure-Memory-Limitations\">Secure Memory wiki page</a>");
return (gpointer)derived_key;
}
gsize input_data_len = strlen (in_memory_json) + 1;
guchar *enc_buffer = g_malloc0 (input_data_len);
gcry_cipher_hd_t hd = open_cipher_and_set_data (derived_key, header_data->iv, IV_SIZE);
if (hd == NULL) {
gcry_free (derived_key);
g_free (header_data);
g_free (enc_buffer);
return NULL;
}
gpg_error_t gpg_err = gcry_cipher_authenticate (hd, header_data, sizeof (HeaderData));
if (gpg_err) {
g_printerr ("%s\n", _("Error while processing the authenticated data."));
gcry_free (derived_key);
g_free (header_data);
g_free (enc_buffer);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
gpg_err = gcry_cipher_encrypt (hd, enc_buffer, input_data_len, in_memory_json, input_data_len);
if (gpg_err) {
g_printerr ("%s\n", _("Error while encrypting the data."));
gcry_free (derived_key);
g_free (enc_buffer);
g_free (header_data);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
guchar tag[TAG_SIZE];
gpg_err = gcry_cipher_gettag (hd, tag, TAG_SIZE); //append tag to outfile
if (gpg_err) {
g_printerr ("%s\n", _("Error while getting the tag."));
gcry_free (derived_key);
g_free (enc_buffer);
g_free (header_data);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
if (g_output_stream_write (G_OUTPUT_STREAM(out_stream), enc_buffer, input_data_len, NULL, &local_err) == -1) {
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "Failed while writing encrypted buffer to file");
cleanup (out_file, out_stream, header_data, local_err);
g_free (enc_buffer);
gcry_free (derived_key);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
if (g_output_stream_write (G_OUTPUT_STREAM(out_stream), tag, TAG_SIZE, NULL, &local_err) == -1) {
g_set_error (err, generic_error_gquark (), GENERIC_ERRCODE, "Failed while writing tag data to file");
cleanup (out_file, out_stream, header_data, local_err);
g_free (enc_buffer);
gcry_free (derived_key);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
g_free (enc_buffer);
gcry_free (derived_key);
gcry_cipher_close (hd);
cleanup (out_file, out_stream, header_data, NULL);
return NULL;
}
static gchar *
decrypt_db (const gchar *db_path,
const gchar *password)
{
GError *err = NULL;
HeaderData *header_data = g_new0 (HeaderData, 1);
goffset input_file_size = get_file_size (db_path);
GFile *in_file = g_file_new_for_path (db_path);
GFileInputStream *in_stream = g_file_read (in_file, NULL, &err);
if (err != NULL) {
g_printerr ("%s\n", err->message);
cleanup (in_file, NULL, header_data, err);
return GENERIC_ERROR;
}
if (g_input_stream_read (G_INPUT_STREAM (in_stream), header_data, sizeof (HeaderData), NULL, &err) == -1) {
g_printerr ("%s\n", err->message);
cleanup (in_file, in_stream, header_data, err);
return GENERIC_ERROR;
}
guchar tag[TAG_SIZE];
if (!g_seekable_seek (G_SEEKABLE (in_stream), input_file_size - TAG_SIZE, G_SEEK_SET, NULL, &err)) {
g_printerr ("%s\n", err->message);
cleanup (in_file, in_stream, header_data, err);
return GENERIC_ERROR;
}
if (g_input_stream_read (G_INPUT_STREAM (in_stream), tag, TAG_SIZE, NULL, &err) == -1) {
g_printerr ("%s\n", err->message);
cleanup (in_file, in_stream, header_data, err);
return GENERIC_ERROR;
}
gsize enc_buf_size = input_file_size - sizeof (HeaderData) - TAG_SIZE;
guchar *enc_buf = g_malloc0 (enc_buf_size);
if (!g_seekable_seek (G_SEEKABLE (in_stream), sizeof (HeaderData), G_SEEK_SET, NULL, &err)) {
g_printerr ("%s\n", err->message);
cleanup (in_file, in_stream, header_data, err);
g_free (enc_buf);
return GENERIC_ERROR;
}
if (g_input_stream_read (G_INPUT_STREAM (in_stream), enc_buf, enc_buf_size, NULL, &err) == -1) {
g_printerr ("%s\n", err->message);
cleanup (in_file, in_stream, header_data, err);
g_free (enc_buf);
return GENERIC_ERROR;
}
g_object_unref (in_stream);
g_object_unref (in_file);
guchar *derived_key = get_derived_key (password, header_data);
if (derived_key == SECURE_MEMORY_ALLOC_ERR || derived_key == KEY_DERIV_ERR) {
g_free (header_data);
g_free (enc_buf);
return (gpointer)derived_key;
}
gcry_cipher_hd_t hd = open_cipher_and_set_data (derived_key, header_data->iv, IV_SIZE);
if (hd == NULL) {
gcry_free (derived_key);
g_free (enc_buf);
g_free (header_data);
return GENERIC_ERROR;
}
gpg_error_t gpg_err = gcry_cipher_authenticate (hd, header_data, sizeof (HeaderData));
if (gpg_err) {
g_printerr ("%s\n", _("Error while processing the authenticated data."));
gcry_free (derived_key);
g_free (header_data);
g_free (enc_buf);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
gchar *dec_buf = gcry_calloc_secure (enc_buf_size, 1);
if (dec_buf == NULL) {
g_printerr ("%s\n", _("Error while allocating secure memory."));
gcry_free (derived_key);
g_free (header_data);
g_free (enc_buf);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
gpg_err = gcry_cipher_decrypt (hd, dec_buf, enc_buf_size, enc_buf, enc_buf_size);
if (gpg_err) {
g_printerr ("%s\n", _("Error while decrypting the data."));
gcry_free (derived_key);
gcry_free (dec_buf);
g_free (header_data);
g_free (enc_buf);
gcry_cipher_close (hd);
return GENERIC_ERROR;
}
if (gcry_err_code (gcry_cipher_checktag (hd, tag, TAG_SIZE)) == GPG_ERR_CHECKSUM) {
gcry_cipher_close (hd);
gcry_free (derived_key);
gcry_free (dec_buf);
g_free (header_data);
g_free (enc_buf);
return TAG_MISMATCH;
}
gcry_cipher_close (hd);
gcry_free (derived_key);
g_free (header_data);
g_free (enc_buf);
return dec_buf;
}
static guchar *
get_derived_key (const gchar *pwd,
HeaderData *header_data)
{
gsize key_len = gcry_cipher_get_algo_keylen (GCRY_CIPHER_AES256);
gsize pwd_len = g_utf8_strlen (pwd, -1) + 1;
guchar *derived_key = gcry_malloc_secure (key_len);
if (derived_key == NULL) {
g_printerr ("%s\n", _("Couldn't allocate the needed secure memory."));
return SECURE_MEMORY_ALLOC_ERR;
}
gpg_error_t ret = gcry_kdf_derive (pwd, pwd_len, GCRY_KDF_PBKDF2, GCRY_MD_SHA512, header_data->salt, KDF_SALT_SIZE, KDF_ITERATIONS, key_len, derived_key);
if (ret != 0) {
gcry_free (derived_key);
g_printerr ("%s\n", _("Error during key derivation."));
return KEY_DERIV_ERR;
}
return derived_key;
}
static void
backup_db (const gchar *path)
{
GError *err = NULL;
GFile *src = g_file_new_for_path (path);
gchar *dst_path = g_strconcat (path, ".bak", NULL);
GFile *dst = g_file_new_for_path (dst_path);
g_free (dst_path);
if (!g_file_copy (src, dst, G_FILE_COPY_OVERWRITE | G_FILE_COPY__SYMLINKS, NULL, NULL, NULL, &err)) {
g_printerr ("Couldn't create the backup file: %s\n", err->message);
g_clear_error (&err);
}
g_object_unref (src);
g_object_unref (dst);
}
static void
restore_db (const gchar *path)
{
GError *err = NULL;
gchar *src_path = g_strconcat (path, ".bak", NULL);
GFile *src = g_file_new_for_path (src_path);
GFile *dst = g_file_new_for_path (path);
g_free (src_path);
if (!g_file_copy (src, dst, G_FILE_COPY_OVERWRITE | G_FILE_COPY__SYMLINKS, NULL, NULL, NULL, &err)) {
g_printerr ("Couldn't restore the backup file: %s\n", err->message);
g_clear_error (&err);
} else {
g_print ("%s\n", _("Backup copy successfully restored."));
}
g_object_unref (src);
g_object_unref (dst);
}
static inline void
json_free (gpointer data)
{
json_decref (data);
}
static void
cleanup (GFile *in_file,
gpointer in_stream,
HeaderData *header_data,
GError *err)
{
g_object_unref (in_file);
if (in_stream != NULL)
g_object_unref (in_stream);
if (header_data != NULL)
g_free (header_data);
if (err != NULL)
g_clear_error (&err);
}