Ejemplo n.º 1
0
static int dek_on_device_locked(dek_arg_on_device_locked *evt) {
	int userid = evt->userid;
	int key_arr_idx;

	if (!dek_is_persona(userid)) {
		DEK_LOGE("%s invalid userid %d\n", __func__, userid);
		return -EFAULT;
	}
	key_arr_idx = PERSONA_KEY_ARR_IDX(userid);

	dek_aes_key_free(sdp_tfm[key_arr_idx]);
	sdp_tfm[key_arr_idx] = NULL;

	zero_out((char *)&SDPK_sym[key_arr_idx], sizeof(kek_t));
	zero_out((char *)&SDPK_Rpri[key_arr_idx], sizeof(kek_t));
    zero_out((char *)&SDPK_Dpri[key_arr_idx], sizeof(kek_t));
    zero_out((char *)&SDPK_EDpri[key_arr_idx], sizeof(kek_t));

	ecryptfs_mm_drop_cache(userid);

#ifdef CONFIG_SDP_KEY_DUMP
    if(get_sdp_sysfs_key_dump()) {
        dump_all_keys(key_arr_idx);
    }
#endif

	return 0;
}
Ejemplo n.º 2
0
static int ecryptfs_release(struct inode *inode, struct file *file)
{
#ifdef CONFIG_SDP
	struct ecryptfs_crypt_stat *crypt_stat;

	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;

	if(crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
#if 0
#ifdef SYNC_ONLY_CURRENT_SB
		struct super_block *sb = inode->i_sb;

		sync_inodes_sb(sb);
		writeback_inodes_sb(sb, WB_REASON_SYNC);
#else
		sys_sync();
#endif
		DEK_LOGD("%s() sensitive inode being closed. [ino:%lu, state:%lu ref_count:%d efs_flag:0x%0.8x]\n",
				__func__, inode->i_ino,  inode->i_state, atomic_read(&inode->i_count),
				crypt_stat->flags);

		spin_lock(&inode->i_lock);

		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
				(inode->i_mapping->nrpages == 0)) {
			spin_unlock(&inode->i_lock);
		} else {
			printk("freeing sensitive inode\n");
			invalidate_mapping_pages(inode->i_mapping, 0, -1);
		}
		spin_unlock(&inode->i_lock);
#else
		DEK_LOGD("%s() sensitive inode being closed. [ino:%lu, state:%lu ref_count:%d]\n",
				__func__, inode->i_ino,  inode->i_state, atomic_read(&inode->i_count));

		ecryptfs_clean_sdp_dek(crypt_stat);

		if(ecryptfs_is_persona_locked(crypt_stat->userid))
			ecryptfs_mm_drop_cache(crypt_stat->userid);
	}
#endif
#endif

	ecryptfs_put_lower_file(inode);
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}
Ejemplo n.º 3
0
static long dek_do_ioctl_evt(unsigned int minor, unsigned int cmd,
		unsigned long arg) {
	long ret = 0;
	void __user *ubuf = (void __user *)arg;
	void *cleanup = NULL;
	unsigned int size;

	switch (cmd) {
	/*
	 * Event while booting.
	 *
	 * This event comes per persona, the driver is responsible to
	 * verify things good whether it's compromised.
	 */
	case DEK_ON_BOOT: {
		dek_arg_on_boot *evt = kzalloc(sizeof(dek_arg_on_boot), GFP_KERNEL);
		
		DEK_LOGD("DEK_ON_BOOT\n");

		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}		
		cleanup = evt;
		size = sizeof(dek_arg_on_boot);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		ret = dek_on_boot(evt);
		if (ret < 0) {
			dek_add_to_log(evt->userid, "Boot failed");
			goto err;
		}
		dek_add_to_log(evt->userid, "Booted");
		break;
	}
	/*
	 * Event when device is locked.
	 *
	 * Nullify private key which prevents decryption.
	 */
	case DEK_ON_DEVICE_LOCKED: {
		dek_arg_on_device_locked *evt = kzalloc(sizeof(dek_arg_on_device_locked), GFP_KERNEL);
		
		DEK_LOGD("DEK_ON_DEVICE_LOCKED\n");
		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}		
		cleanup = evt;
		size = sizeof(dek_arg_on_device_locked);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		ret = dek_on_device_locked(evt);
		if (ret < 0) {
			dek_add_to_log(evt->userid, "Lock failed");
			goto err;
		}
		dek_add_to_log(evt->userid, "Locked");
		break;
	}
	/*
	 * Event when device unlocked.
	 *
	 * Read private key and decrypt with user password.
	 */
	case DEK_ON_DEVICE_UNLOCKED: {
		dek_arg_on_device_unlocked *evt = kzalloc(sizeof(dek_arg_on_device_unlocked), GFP_KERNEL);

		DEK_LOGD("DEK_ON_DEVICE_UNLOCKED\n");
		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}		
		cleanup = evt;
		size = sizeof(dek_arg_on_device_unlocked);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		ret = dek_on_device_unlocked(evt);
		if (ret < 0) {
			dek_add_to_log(evt->userid, "Unlock failed");
			goto err;
		}
		dek_add_to_log(evt->userid, "Unlocked");
		break;
	}
	/*
	 * Event when new user(persona) added.
	 *
	 * Generate RSA public key and encrypt private key with given
	 * password. Also pub-key and encryped priv-key have to be stored
	 * in a file system.
	 */
	case DEK_ON_USER_ADDED: {
		dek_arg_on_user_added *evt = kzalloc(sizeof(dek_arg_on_user_added), GFP_KERNEL);

		DEK_LOGD("DEK_ON_USER_ADDED\n");
		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}		
		cleanup = evt;
		size = sizeof(dek_arg_on_user_added);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		ret = dek_on_user_added(evt);
		if (ret < 0) {
			dek_add_to_log(evt->userid, "Add user failed");
			goto err;
		}
		dek_add_to_log(evt->userid, "Added user");
		break;
	}
	/*
	 * Event when user is removed.
	 *
	 * Remove pub-key file & encrypted priv-key file.
	 */
	case DEK_ON_USER_REMOVED: {
		dek_arg_on_user_removed *evt = kzalloc(sizeof(dek_arg_on_user_removed), GFP_KERNEL);
		
		DEK_LOGD("DEK_ON_USER_REMOVED\n");
		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}		
		cleanup = evt;
		size = sizeof(dek_arg_on_user_removed);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		ret = dek_on_user_removed(evt);
		if (ret < 0) {
			dek_add_to_log(evt->userid, "Remove user failed");
			goto err;
		}
		dek_add_to_log(evt->userid, "Removed user");
		break;
	}
	/*
	 * Event when password changed.
	 *
	 * Encrypt SDPK_Rpri with new password and store it.
	 */
	case DEK_ON_CHANGE_PASSWORD: {
		DEK_LOGD("DEK_ON_CHANGE_PASSWORD << deprecated. SKIP\n");
		ret = 0;
		dek_add_to_log(0, "Changed password << deprecated");
		break;
	}

	case DEK_DISK_CACHE_CLEANUP: {
		dek_arg_disk_cache_cleanup *evt = kzalloc(sizeof(dek_arg_disk_cache_cleanup), GFP_KERNEL);

		DEK_LOGD("DEK_DISK_CACHE_CLEANUP\n");
		if (evt == NULL) {
			ret = -ENOMEM;
			goto err;
		}
		cleanup = evt;
		size = sizeof(dek_arg_on_user_removed);

		if(copy_from_user(evt, ubuf, size)) {
			DEK_LOGE("can't copy from user evt\n");
			ret = -EFAULT;
			goto err;
		}
		if (!dek_is_persona(evt->userid)) {
			DEK_LOGE("%s invalid userid %d\n", __func__, evt->userid);
			ret = -EFAULT;
			goto err;
		}

		ecryptfs_mm_drop_cache(evt->userid);
		ret = 0;
		dek_add_to_log(evt->userid, "Disk cache clean up");
		break;
	}
	default:
		DEK_LOGE("%s case default\n", __func__);
		ret = -EINVAL;
		break;
	}

err:
	if (cleanup) {
		zero_out((char *)cleanup, size);
		kfree(cleanup);
	}
	return ret;
}