mirror of
https://gitlab.gnome.org/GNOME/libsecret.git
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file-collection: Move low-level crypto functions to egg
This moves low-level cryptographic functions into egg/egg-keyring1.c, to make it easy to support multiple crypto backend libraries. Signed-off-by: Daiki Ueno <dueno@src.gnome.org>
This commit is contained in:
Daiki Ueno
parent
0b4769f871
commit
564874beb0
193
egg/egg-keyring1.c
Normal file
193
egg/egg-keyring1.c
Normal file
@ -0,0 +1,193 @@
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/* libsecret - GLib wrapper for Secret Service
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*
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* Copyright 2019 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the licence or (at
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* your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Author: Daiki Ueno
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*/
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#include "config.h"
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#include "egg-keyring1.h"
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#include "egg/egg-secure-memory.h"
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EGG_SECURE_DECLARE (egg_keyring1);
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#include <gcrypt.h>
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#define PBKDF2_HASH_ALGO GCRY_MD_SHA256
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#define MAC_ALGO GCRY_MAC_HMAC_SHA256
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#define CIPHER_ALGO GCRY_CIPHER_AES128
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void
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egg_keyring1_create_nonce (guint8 *nonce,
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gsize nonce_size)
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{
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gcry_create_nonce (nonce, nonce_size);
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}
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GBytes *
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egg_keyring1_derive_key (const gchar *password,
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gsize n_password,
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GBytes *salt,
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guint32 iteration_count)
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{
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guint8 *buffer;
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gcry_error_t gcry;
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buffer = egg_secure_alloc (KEY_SIZE);
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g_return_val_if_fail (buffer, NULL);
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gcry = gcry_kdf_derive (password,
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n_password,
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GCRY_KDF_PBKDF2, PBKDF2_HASH_ALGO,
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g_bytes_get_data (salt, NULL),
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g_bytes_get_size (salt),
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iteration_count,
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KEY_SIZE, buffer);
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if (gcry != 0) {
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egg_secure_free (buffer);
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return NULL;
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}
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return g_bytes_new_with_free_func (buffer,
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KEY_SIZE,
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egg_secure_free,
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buffer);
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}
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gboolean
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egg_keyring1_calculate_mac (GBytes *key,
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const guint8 *value,
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gsize n_value,
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guint8 *buffer)
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{
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gcry_mac_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_mac_open (&hd, MAC_ALGO, 0, NULL);
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g_return_val_if_fail (gcry == 0, FALSE);
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secret = g_bytes_get_data (key, &n_secret);
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gcry = gcry_mac_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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gcry = gcry_mac_write (hd, value, n_value);
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if (gcry != 0)
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goto out;
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n_value = MAC_SIZE;
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gcry = gcry_mac_read (hd, buffer, &n_value);
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if (gcry != 0)
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goto out;
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if (n_value != MAC_SIZE)
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goto out;
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ret = TRUE;
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out:
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gcry_mac_close (hd);
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return ret;
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}
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gboolean
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egg_keyring1_verify_mac (GBytes *key,
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const guint8 *value,
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gsize n_value,
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const guint8 *data)
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{
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guint8 buffer[MAC_SIZE];
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guint8 status = 0;
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gsize i;
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if (!egg_keyring1_calculate_mac (key, value, n_value, buffer)) {
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return FALSE;
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}
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for (i = 0; i < MAC_SIZE; i++) {
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status |= data[i] ^ buffer[i];
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}
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return status == 0;
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}
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gboolean
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egg_keyring1_decrypt (GBytes *key,
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guint8 *data,
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gsize n_data)
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{
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gcry_cipher_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_cipher_open (&hd, CIPHER_ALGO, GCRY_CIPHER_MODE_CBC, 0);
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if (gcry != 0)
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goto out;
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secret = g_bytes_get_data (key, &n_secret);
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gcry = gcry_cipher_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_setiv (hd, data + n_data, IV_SIZE);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_decrypt (hd, data, n_data, NULL, 0);
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if (gcry != 0)
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goto out;
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ret = TRUE;
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out:
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gcry_cipher_close (hd);
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return ret;
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}
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gboolean
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egg_keyring1_encrypt (GBytes *key,
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guint8 *data,
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gsize n_data)
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{
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gcry_cipher_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_cipher_open (&hd, CIPHER_ALGO, GCRY_CIPHER_MODE_CBC, 0);
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if (gcry != 0)
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goto out;
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secret = g_bytes_get_data (key, &n_secret);
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gcry = gcry_cipher_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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egg_keyring1_create_nonce (data + n_data, IV_SIZE);
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gcry = gcry_cipher_setiv (hd, data + n_data, IV_SIZE);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_encrypt (hd, data, n_data, NULL, 0);
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if (gcry != 0)
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goto out;
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ret = TRUE;
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out:
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gcry_cipher_close (hd);
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return ret;
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}
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55
egg/egg-keyring1.h
Normal file
55
egg/egg-keyring1.h
Normal file
@ -0,0 +1,55 @@
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/* libsecret - GLib wrapper for Secret Service
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*
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* Copyright 2019 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the licence or (at
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* your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Author: Daiki Ueno
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*/
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#ifndef EGG_KEYRING1_H_
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#define EGG_KEYRING1_H_
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#include <glib.h>
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#define SALT_SIZE 32
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#define ITERATION_COUNT 100000
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#define MAC_SIZE 32
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#define CIPHER_BLOCK_SIZE 16
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#define KEY_SIZE 16
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#define IV_SIZE CIPHER_BLOCK_SIZE
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void egg_keyring1_create_nonce (guint8 *nonce,
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gsize nonce_size);
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GBytes *egg_keyring1_derive_key (const char *password,
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gsize n_password,
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GBytes *salt,
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guint32 iteration_count);
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gboolean egg_keyring1_calculate_mac (GBytes *key,
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const guint8 *value,
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gsize n_value,
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guint8 *buffer);
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gboolean egg_keyring1_verify_mac (GBytes *key,
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const guint8 *value,
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gsize n_value,
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const guint8 *data);
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gboolean egg_keyring1_decrypt (GBytes *key,
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guint8 *data,
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gsize n_data);
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gboolean egg_keyring1_encrypt (GBytes *key,
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guint8 *data,
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gsize n_data);
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#endif /* EGG_KEYRING1_H_ */
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@ -12,6 +12,7 @@ if get_option('gcrypt')
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libegg_sources += [
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'egg-dh.c',
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'egg-hkdf.c',
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'egg-keyring1.c',
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'egg-libgcrypt.c',
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]
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@ -16,27 +16,12 @@
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#include "secret-file-collection.h"
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#include "egg/egg-keyring1.h"
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#include "egg/egg-libgcrypt.h"
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#include "egg/egg-secure-memory.h"
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EGG_SECURE_DECLARE (secret_file_collection);
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#ifdef WITH_GCRYPT
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#include <gcrypt.h>
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#endif
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#define PBKDF2_HASH_ALGO GCRY_MD_SHA256
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#define SALT_SIZE 32
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#define ITERATION_COUNT 100000
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#define MAC_ALGO GCRY_MAC_HMAC_SHA256
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#define MAC_SIZE 32
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#define CIPHER_ALGO GCRY_CIPHER_AES128
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#define CIPHER_BLOCK_SIZE 16
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#define KEY_SIZE 16
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#define IV_SIZE CIPHER_BLOCK_SIZE
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#define KEYRING_FILE_HEADER "GnomeKeyring\n\r\0\n"
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#define KEYRING_FILE_HEADER_LEN 16
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@ -86,158 +71,6 @@ get_file_last_modified (SecretFileCollection *self)
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return res;
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}
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static gboolean
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do_derive_key (SecretFileCollection *self)
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{
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const gchar *password;
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gsize n_password;
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gchar *key;
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gsize n_salt;
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gcry_error_t gcry;
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password = secret_value_get (self->password, &n_password);
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key = egg_secure_alloc (KEY_SIZE);
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self->key = g_bytes_new_with_free_func (key,
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KEY_SIZE,
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egg_secure_free,
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key);
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n_salt = g_bytes_get_size (self->salt);
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gcry = gcry_kdf_derive (password, n_password,
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GCRY_KDF_PBKDF2, PBKDF2_HASH_ALGO,
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g_bytes_get_data (self->salt, NULL), n_salt,
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self->iteration_count, KEY_SIZE, key);
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return (gcry != 0) ? FALSE : TRUE;
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}
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static gboolean
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do_calculate_mac (SecretFileCollection *self,
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const guint8 *value, gsize n_value,
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guint8 *buffer)
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{
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gcry_mac_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_mac_open (&hd, MAC_ALGO, 0, NULL);
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g_return_val_if_fail (gcry == 0, FALSE);
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secret = g_bytes_get_data (self->key, &n_secret);
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gcry = gcry_mac_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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gcry = gcry_mac_write (hd, value, n_value);
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if (gcry != 0)
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goto out;
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n_value = MAC_SIZE;
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gcry = gcry_mac_read (hd, buffer, &n_value);
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if (gcry != 0)
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goto out;
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if (n_value != MAC_SIZE)
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goto out;
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ret = TRUE;
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out:
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gcry_mac_close (hd);
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return ret;
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}
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static gboolean
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do_verify_mac (SecretFileCollection *self,
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const guint8 *value, gsize n_value,
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const guint8 *data)
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{
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guint8 buffer[MAC_SIZE];
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guint8 status = 0;
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gsize i;
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if (!do_calculate_mac (self, value, n_value, buffer)) {
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return FALSE;
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}
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for (i = 0; i < MAC_SIZE; i++) {
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status |= data[i] ^ buffer[i];
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}
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return status == 0;
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}
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static gboolean
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do_decrypt (SecretFileCollection *self,
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guint8 *data,
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gsize n_data)
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{
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gcry_cipher_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_cipher_open (&hd, CIPHER_ALGO, GCRY_CIPHER_MODE_CBC, 0);
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if (gcry != 0)
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goto out;
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secret = g_bytes_get_data (self->key, &n_secret);
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gcry = gcry_cipher_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_setiv (hd, data + n_data, IV_SIZE);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_decrypt (hd, data, n_data, NULL, 0);
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if (gcry != 0)
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goto out;
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ret = TRUE;
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out:
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(void) gcry_cipher_close (hd);
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return ret;
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}
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static gboolean
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do_encrypt (SecretFileCollection *self,
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guint8 *data,
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gsize n_data)
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{
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gcry_cipher_hd_t hd;
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gcry_error_t gcry;
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gconstpointer secret;
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gsize n_secret;
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gboolean ret = FALSE;
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gcry = gcry_cipher_open (&hd, CIPHER_ALGO, GCRY_CIPHER_MODE_CBC, 0);
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if (gcry != 0)
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goto out;
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secret = g_bytes_get_data (self->key, &n_secret);
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gcry = gcry_cipher_setkey (hd, secret, n_secret);
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if (gcry != 0)
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goto out;
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gcry_create_nonce (data + n_data, IV_SIZE);
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gcry = gcry_cipher_setiv (hd, data + n_data, IV_SIZE);
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if (gcry != 0)
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goto out;
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gcry = gcry_cipher_encrypt (hd, data, n_data, NULL, 0);
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if (gcry != 0)
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goto out;
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ret = TRUE;
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out:
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(void) gcry_cipher_close (hd);
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return ret;
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}
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static void
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secret_file_collection_init (SecretFileCollection *self)
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{
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@ -329,6 +162,8 @@ load_contents (SecretFileCollection *self,
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guint64 usage_count;
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gconstpointer data;
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gsize n_data;
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const gchar *password;
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gsize n_password;
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p = contents;
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if (length < KEYRING_FILE_HEADER_LEN ||
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@ -380,7 +215,12 @@ load_contents (SecretFileCollection *self,
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g_variant_unref (salt_array);
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g_variant_unref (variant);
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if (!do_derive_key (self)) {
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password = secret_value_get (self->password, &n_password);
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self->key = egg_keyring1_derive_key (password,
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n_password,
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self->salt,
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self->iteration_count);
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if (!self->key) {
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g_set_error_literal (error,
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SECRET_ERROR,
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SECRET_ERROR_PROTOCOL,
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@ -396,15 +236,22 @@ init_empty_file (SecretFileCollection *self,
|
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GError **error)
|
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{
|
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GVariantBuilder builder;
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const gchar *password;
|
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gsize n_password;
|
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guint8 salt[SALT_SIZE];
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|
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gcry_create_nonce (salt, sizeof(salt));
|
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egg_keyring1_create_nonce (salt, sizeof(salt));
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self->salt = g_bytes_new (salt, sizeof(salt));
|
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self->iteration_count = ITERATION_COUNT;
|
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self->modified = g_date_time_new_now_utc ();
|
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self->usage_count = 0;
|
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|
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if (!do_derive_key (self)) {
|
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password = secret_value_get (self->password, &n_password);
|
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self->key = egg_keyring1_derive_key (password,
|
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n_password,
|
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self->salt,
|
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self->iteration_count);
|
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if (!self->key) {
|
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g_set_error_literal (error,
|
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SECRET_ERROR,
|
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SECRET_ERROR_PROTOCOL,
|
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@ -556,7 +403,10 @@ hash_attributes (SecretFileCollection *self,
|
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GVariant *variant;
|
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|
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value = g_hash_table_lookup (attributes, l->data);
|
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if (!do_calculate_mac (self, (guint8 *)value, strlen (value), buffer)) {
|
||||
if (!egg_keyring1_calculate_mac (self->key,
|
||||
(const guint8 *)value,
|
||||
strlen (value),
|
||||
buffer)) {
|
||||
g_list_free (keys);
|
||||
return NULL;
|
||||
}
|
||||
@ -598,7 +448,7 @@ hashed_attributes_match (SecretFileCollection *self,
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (!do_verify_mac (self, value, strlen ((char *)value), data)) {
|
||||
if (!egg_keyring1_verify_mac (self->key, value, strlen ((char *)value), data)) {
|
||||
g_variant_unref (hashed_attribute);
|
||||
return FALSE;
|
||||
}
|
||||
@ -694,7 +544,7 @@ secret_file_collection_replace (SecretFileCollection *self,
|
||||
g_variant_store (serialized_item, data);
|
||||
g_variant_unref (serialized_item);
|
||||
memset (data + n_data, n_padded - n_data, n_padded - n_data);
|
||||
if (!do_encrypt (self, data, n_padded)) {
|
||||
if (!egg_keyring1_encrypt (self->key, data, n_padded)) {
|
||||
egg_secure_free (data);
|
||||
g_set_error (error,
|
||||
SECRET_ERROR,
|
||||
@ -703,7 +553,7 @@ secret_file_collection_replace (SecretFileCollection *self,
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (!do_calculate_mac (self, data, n_padded + IV_SIZE,
|
||||
if (!egg_keyring1_calculate_mac (self->key, data, n_padded + IV_SIZE,
|
||||
data + n_padded + IV_SIZE)) {
|
||||
egg_secure_free (data);
|
||||
g_set_error (error,
|
||||
@ -792,7 +642,7 @@ _secret_file_item_decrypt (GVariant *encrypted,
|
||||
}
|
||||
|
||||
n_padded -= MAC_SIZE;
|
||||
if (!do_verify_mac (collection, data, n_padded, data + n_padded)) {
|
||||
if (!egg_keyring1_verify_mac (collection->key, data, n_padded, data + n_padded)) {
|
||||
egg_secure_free (data);
|
||||
g_set_error (error,
|
||||
SECRET_ERROR,
|
||||
@ -802,7 +652,7 @@ _secret_file_item_decrypt (GVariant *encrypted,
|
||||
}
|
||||
|
||||
n_padded -= IV_SIZE;
|
||||
if (!do_decrypt (collection, data, n_padded)) {
|
||||
if (!egg_keyring1_decrypt (collection->key, data, n_padded)) {
|
||||
egg_secure_free (data);
|
||||
g_set_error (error,
|
||||
SECRET_ERROR,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user