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README
Apache-2.0

设备安全等级管理

简介

OpenHarmony的分布式技术可以实现不同设备的资源融合,将多个设备虚拟成一个“超级虚拟终端”。在这个“超级虚拟终端”的内部,处理、流转各类用户数据时,需要确保各个节点不因安全能力薄弱,成为整个“超级虚拟终端”的薄弱点,因此引入设备安全等级管理模块来解决这类问题。

OpenHarmony设备的安全等级取决于设备的系统安全能力。OpenHarmony系统安全能力,根植于硬件实现的三个可信根:启动、存储、计算。基于基础安全工程能力,重点围绕以下三点构建相关的安全技术和能力:设备完整性保护、数据机密性保护、漏洞攻防对抗。

OpenHarmony系统安全架构如下图所示:

OpenHarmony系统安全架构

上图为典型的OpenHarmony单设备系统安全架构,在不同种类OpenHarmony设备上的实现可以存在差异,取决于设备的威胁分析(风险高低)和设备的软硬件资源。OpenHarmony在参考业界权威的安全分级模型基础上,结合OpenHarmony实际的业务场景和设备分类,将OpenHarmony设备的安全能力划分为 5 个安全等级:SL1 ~ SL5。OpenHarmony操作系统生态体系中,要求高一级的设备安全能力默认包含低一级的设备安全能力。分级概要可参考下图:

OpenHarmony设备安全等级

  • SL1为OpenHarmony设备中最低的安全等级。这类设备通常搭载轻量级系统和使用低端微处理器,业务形态较为单一,不涉及敏感数据的处理。本安全等级要求消除常见的错误,支持软件的完整性保护。若无法满足本等级的要求,则只能作为配件受OpenHarmony设备操控,无法反向操控OpenHarmony设备并进行更复杂的业务协同。

  • SL2安全等级的OpenHarmony设备,可对自身数据进行标记并定义访问控制规则,实现自主的访问控制,需要具备基础的抗渗透能力。此级别设备可支持轻量化的可安全隔离环境,用于部署少量必需的安全业务。

  • SL3安全等级的OpenHarmony设备,具备较为完善的安全保护能力。其操作系统具有较为完善的安全语义,可支持强制访问控制。系统可结构化为关键保护元素和非关键保护元素,其关键保护元素被明确定义的安全策略模型保护。此级别设备应具备一定的抗渗透能力,可对抗常见的漏洞利用方法。

  • SL4安全等级的OpenHarmony设备,可信基应保持足够的精简,具备防篡改的能力。SL4的实现应足够精简和安全,可对关键保护元素的访问控制进行充分的鉴定和仲裁。此级别设备具备相当的抗渗透能力,可抑制绝大多数软件攻击。

  • SL5安全等级的OpenHarmony设备,为OpenHarmony设备中具备最高等级安全防护能力的设备。系统核心软件模块应进行形式化验证。关键硬件模块如可信根、密码计算引擎等应具备防物理攻击能力,可应对实验室级别的攻击。此级别设备应具备高安全单元,如专用的安全芯片,用于强化设备的启动可信根、存储可信根、运行可信根。

当“超级虚拟终端”内的各个设备有了自己的“设备安全等级”,这个“超级虚拟终端”的内部,各类用户数据的处理或流转便有了决策依据。

关于数据风险等级和设备安全等级之间的关系,可参考数据分级保护

目录

设备安全等级管理模块的代码目录结构如下:

base/security/device_security_level
├── baselib        # 基础库
├── common         # 公共头文件
├── interfaces     # inner api接口
├── oem_property   # OEM厂家适配层
├── profile        # 组件配置文件
├── services       # 服务框架代码
└── test           # 测试代码

约束

  • 开发语言:C/C++
  • OpenHarmony设备的默认安全等级为SL1,设备制造商可以根据设备实际情况定制更高的安全等级。

说明

接口说明

各子系统在处理、流转各类用户数据时,可以调用“设备安全等级管理”模块提供的下列接口,获取相关设备的安全等级信息。

接口名 说明
int32_t RequestDeviceSecurityInfo(const DeviceIdentify *identify, const RequestOption *option, DeviceSecurityInfo **info); 请求获取某设备的设备安全等级信息(同步接口)
int32_t RequestDeviceSecurityInfoAsync(const DeviceIdentify *identify, const RequestOption *option, DeviceSecurityInfoCallback callback); 请求获取某设备的设备安全等级信息(异步接口)
void FreeDeviceSecurityInfo(DeviceSecurityInfo *info); 释放设备安全等级信息
int32_t GetDeviceSecurityLevelValue(const DeviceSecurityInfo *info, int32_t *level); 从设备安全等级信息中提取对应的设备安全等级

使用说明

所有接口均为native C内部接口,仅提供底层能力,不对App开放。

  • 依赖添加
  1. 编译依赖添加

    external_deps += [ "device_security_level:dslm_sdk" ]
  2. 头文件依赖添加

    #include "device_security_defines.h" // 关键数据结构定义头文件
    #include "device_security_info.h"    // 接口函数定义头文件
  • 接口使用示例
  1. 同步接口使用示例如下:

    void CheckDestDeviceSecurityLevel(const DeviceIdentify *device, RequestOption *option)
    {
        // 设备安全等级信息指针
        DeviceSecurityInfo *info = NULL;
    
        // 调用同步接口获取设备的安全等级等级信息
        int32_t ret = RequestDeviceSecurityInfo(device, option, &info);
        if (ret != SUCCESS) {
            // 获取信息失败。此场景建议开发者根据实际情况进行重试
            return;
        }
        int32_t level = 0;
        // 从设备安全等级信息中提取设备安全等级字段
        ret = GetDeviceSecurityLevelValue(info, &level);
        if (ret != SUCCESS) {
            // 提取信息失败, 此场景建议开发者根据实际情况进行重试
            FreeDeviceSecurityInfo(info);
            return;
        }
    
        // 成功获取到设备安全等级,确认当前操作允许的最低安全等级
        // 假设当前操作允许的最低设备安全等级为3
        if (level >= 3) {
            // 目标设备的设备安全等级满足要求, 相关业务正常处理
        } else {
            // 目标设备的设备安全等级不满足要求, 建议开发者结合实际业务场景进行相应处理,例如告警、弹窗提示用户等
        }
    
        // 结束处理前,需要释放内存
        FreeDeviceSecurityInfo(info);
    }
  2. 异步接口使用示例如下:

    // 回调函数
    void DeviceSecurityInfoCallback(const DeviceIdentify *identify, struct DeviceSecurityInfo *info)
    {
        int32_t level = 0;
        // 从设备安全等级信息中提取设备安全等级字段
        int32_t ret = GetDeviceSecurityLevelValue(info, &level);
        if (ret != SUCCESS) {
            // 获取信息失败。此场景建议开发者根据实际情况进行重试
            FreeDeviceSecurityInfo(info);
            return;
        }
    
        // 成功获取到设备安全等级,确认当前操作允许的最低安全等级
        // 假设当前操作允许的最低设备安全等级为3
        if (level >= 3) {
            // 目标设备的设备安全等级满足要求, 相关业务正常处理
        } else {
            // 目标设备的设备安全等级不满足要求, 建议开发者结合实际业务场景进行相应处理,例如告警、弹窗提示用户等
        }
    
        // 结束处理前,需要释放内存
        FreeDeviceSecurityInfo(info);
    }
    
    void CheckDestDeviceSecurityLevelAsync(const DeviceIdentify *device, RequestOption *option)
    {
        // 调用异步接口获取设备设备的安全等级等级信息
        int ret = RequestDeviceSecurityInfoAsync(device, option, DeviceSecurityInfoCallback);
        if (ret != SUCCESS) {
            // 获取信息失败,此场景建议开发者根据实际情况进行重试
            // 此场景下callback不会回调。
            return;
        }
        // 调用成功,等待callback回调。
    }

Changelog

  • V1.0 首次提交

相关仓

数据分级保护

设备安全等级管理

HUKS

应用权限管理

设备认证

SELinux

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