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README
Apache-2.0

security_selinux

简介

SELinux (安全增强式 Linux , Security-Enhanced Linux )是 Linux 历史上杰出的安全组件, 包含一组内核修改和用户空间工具,并提供了基于安全策略的强制访问控制机制( Mandatory Access Control , MAC )。SELinux 已经被添加到各种 Linux 发行版中。其软件架构力图将软件执行与安全策略设计分离。本部件负责对文件,属性,服务等系统资源提供强制访问控制保护。提供neverallow规则限制系统中的高危操作,减少系统安全风险。

访问控制基本流程如下图所示: 整体架构

目录

.
├── config                  # 板侧    三方库配置文件
├── docs                    #         文档资源
│   └── images
├── interfaces
│   ├── policycoreutils     # 板侧    libload_policy.so、librestorecon.so
│   │   ├── include
│   │   └── src
│   └── tools               # 板侧    load_policy、restorecon
│       ├── load_policy
│       └── restorecon
├── scripts                 # 编译侧  策略编译脚本
├── sepolicy                # 编译侧  策略文件
└── test                    #         测试程序

约束

目前Selinux只支持RK3568

使用说明

编译镜像

运行以下命令编译打包支持 SELinux 的镜像:

本模块单独编译命令
./build.sh --product-name=rk3568 -T selinux --ccache

运行验证

将镜像烧录到开发板上,开机,通过串口拿到 Shell ,在其中执行:

ls -lZ /         # 查看文件标签
ls -lLZ /        # 查看link源文件标签
ps -eZ           # 查看进程标签
setenforce 1     # 使能selinux强制模式
setenforce 0     # 是能selinux宽容模式,当前默认宽容模式
getenforce       # 获取selinux工作模式

策略文件 /etc/selinux/targeted/policy/policy.31

文件标签规则 /etc/selinux/targeted/policy/file_contexts

selinux模式开关 /etc/selinux/config

验证时,可单独替换上述文件。

日志信息

audit: type=1400 audit(1502458430.566:4): avc:  denied  { open } for  pid=1658 comm="setenforce" path="/sys/fs/selinux/enforce" dev="selinuxfs" ino=4 scontext=u:r:hdcd:s0 tcontext=u:object_r:selinuxfs:s0 tclass=file permissive=1

日志解读
open                                #操作为open
pid=1658                            #访问主体进程号为1658
comm="setenforce"                   #访问主体进程名为setenforce
path="/sys/fs/selinux/enforce"      #被访问客体为/sys/fs/selinux/enforce
dev="selinuxfs"                     #被访问文件属于selinuxfs这一文件系统
ino=4                               #文件节点编号为4
scontext=u:r:hdcd:s0                #访问主体selinux标签为u:r:hdcd:s0
tcontext=u:object_r:selinuxfs:s0   #被访问客体selinux标签为u:object_r:selinuxfs:s0
tclass=file                         #当前告警属于file类型的操作
permissive=1                        #当前selinux处于宽容模式,只告警不做访问拦截。强制模式时,做拦截, permissive=0

策略编写

根据avc告警,获取访问信息
如:
audit: type=1400 audit(1502458430.566:4): avc:  denied  { open } for  pid=1658 comm="setenforce" path="/sys/fs/selinux/enforce" dev="selinuxfs" ino=4 scontext=u:r:hdcd:s0 tcontext=u:object_r:selinuxfs:s0 tclass=file permissive=1
对应规则为
allow hdcd selinuxfs:file open;

相关仓

涉及到的仓库有以下几个:

仓库 源码目录 说明
security_selinux base/security/selinux/ 策略和一些自研接口
third_party_selinux third_party/selinux/ SELinux 的主仓库
productdefine_common productdefine/common/ 添加 SELinux 组件定义
third_party_toybox third_party/toybox/ 完善了 ls 的 SELinux 支持
startup_init_lite base/startup/init_lite/ 系统启动加载策略并分化服务的标签
third_party_FreeBSD third_party/FreeBSD/ 提供 fts 库
third_party_pcre third_party/pcre/ 提供 pcre2 库
build build/ 编译控制
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