Docker安全扫描工具之DockerScan

阅读原文时间：2021年11月22日阅读：1

　　本篇简单介绍Docker扫描工具DockerScan的安装使用。下述过程是在CentOS 7.6的虚拟机上进行的。

[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

　　安装过程请参考。

　　CentOS 7.6默认自带python 2.7.5。

[root@localhost ~]# python --version
Python 2.7.

　　CentOS的软件版本都比较老，DockerScan需python 3支持，使用yum命令直接安装即可。

[root@localhost ~]# yum install python3 -y　　　　　　　　　　　　　　# 安装python3

[root@localhost ~]# python3 --version 　　　　　　　　　　　　　　　 # 查看python3 版本
Python 3.6.

[root@localhost ~]# pip3 --version 　　　　　　　　　　　　　　　 **　# 查看pip3版本**
pip 9.0. from /usr/lib/python3./site-packages (python 3.6)

　　使用pip3即可直接下载安装DockerScan，十分方便。

[root@localhost ~]# pip3 install dockerscan
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Requirement already satisfied: dockerscan in /usr/local/lib/python3./site-packages
Requirement already satisfied: click==6.7 in /usr/local/lib/python3./site-packages (from dockerscan)
Requirement already satisfied: booby-ng==0.8. in /usr/local/lib/python3./site-packages (from dockerscan)
Requirement already satisfied: requests==2.13. in /usr/local/lib/python3./site-packages (from dockerscan)
Requirement already satisfied: colorlog==2.10. in /usr/local/lib/python3./site-packages (from dockerscan)
Requirement already satisfied: python-dxf==4.0. in /usr/local/lib/python3./site-packages (from dockerscan)
Requirement already satisfied: six in /usr/local/lib/python3./site-packages (from booby-ng==0.8.->dockerscan)
Requirement already satisfied: ecdsa>=0.13 in /usr/local/lib/python3./site-packages (from python-dxf==4.0.->dockerscan)
Requirement already satisfied: www-authenticate>=0.9. in /usr/local/lib/python3./site-packages (from python-dxf==4.0.->dockerscan)
Requirement already satisfied: jws>=0.1. in /usr/local/lib/python3./site-packages (from python-dxf==4.0.->dockerscan)
Requirement already satisfied: tqdm>=4.10. in /usr/local/lib/python3./site-packages (from python-dxf==4.0.->dockerscan)

　　我们可以使用一些镜像Hub里的Docker镜像进行测试。

[root@localhost docker]# pwd
/root/docker
[root@localhost docker]# ls
[root@localhost docker]# docker pull mysql　　　　　　# 拉取mysql docker镜像
Using default tag: latest
latest: Pulling from library/mysql
80369df48736: Pull complete
e8f52315cb10: Pull complete
cf2189b391fc: Pull complete
cc98f645c682: Pull complete
27a27ac83f74: Pull complete
fa1f04453414: Pull complete
d45bf7d22d33: Pull complete
3dbac26e409c: Pull complete
9017140fb8c1: Verifying Checksum
b76dda2673ae: Download complete
bea9eb46d12a: Download complete
e1f050a38d0f: Download complete
latest: Pulling from library/mysql
80369df48736: Pull complete
e8f52315cb10: Pull complete
cf2189b391fc: Pull complete
cc98f645c682: Pull complete
27a27ac83f74: Pull complete
fa1f04453414: Pull complete
d45bf7d22d33: Pull complete
3dbac26e409c: Pull complete
9017140fb8c1: Pull complete
b76dda2673ae: Pull complete
bea9eb46d12a: Pull complete
e1f050a38d0f: Pull complete
Digest: sha256:7345ce4ce6f0c1771d01fa333b8edb2c606ca59d385f69575f8e3e2ec6695eee
Status: Downloaded newer image for mysql:latest
docker.io/library/mysql:latest
[root@localhost docker]# docker images 　　　　　　　　　　# 查看本地docker镜像
REPOSITORY TAG IMAGE ID CREATED SIZE
mysql latest c8ee894bd2bd days ago 456MB
[root@localhost docker]# docker save -o mysql.tar mysql　　　 # 导出docker镜像
[root@localhost docker]# ls
mysql.tar

说明

　　目前DockerScan还没有一些比较正式的官方文档，只能自己一边摸索着使用了。

　　帮助文档：

[root@localhost ~]# dockerscan --help
Usage: dockerscan [OPTIONS] COMMAND [ARGS]…

Options:
-v Verbose output
-d enable debug
-q, --quiet Minimal output
--version Show the version and exit.
-h, --help Show this message and exit.

Commands:
image Docker images commands
registry Docker registry actions
scan Search for Open Docker Registries

　　从上可以看到，目前主要支持三个命令:image、registry、scan。【2019.10.22】

image命令

　　可以使用dockerscan image --help查看子命令更细致的帮助文档。

[root@localhost docker]# dockerscan image --help # 查看帮助文档
Usage: dockerscan image [OPTIONS] COMMAND [ARGS]…

Docker images commands

Options:
-h, --help Show this message and exit.

Commands:
analyze looking for sensitive data from docker image　　　　　　# 分析
extract extract docker image content　　　　　　　　　　　　　　　 # 抽取docker镜像内容
info get docker image information　　　　　　　　　　　　　　　 # 获取docker镜像信息
modify Modify a docker image commands　　　　　　　　　　　　　　 # 修改docker镜像命令

info

　　使用info子命令查看docker镜像信息。

[root@localhost docker]# dockerscan image info mysql.tar 　　　　　　# info查看docker镜像信息
[ * ] Starting analyzing docker image…
[ * ] Selected image: 'mysql.tar'
[ * ] Analysis finished. Results:
[ * ] - Entry point:
[ * ] > docker-entrypoint.sh　　　　　　　　　　　　　　
[ * ] - Created date = --17T04::.532313415Z
[ * ] - Docker version = 18.06.-ce　　　　　　　　　　　　　　# docker版本信息
[ * ] - Cmd = mysqld
[ * ] - Environment:
[ * ] > PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
[ * ] > GOSU_VERSION=1.7
[ * ] > MYSQL_MAJOR=8.0　　　　　　
[ * ] > MYSQL_VERSION=8.0.-1debian9　　　　　　　　　　 # mysqld的版本，当前最新版
[ * ] - Exposed ports:　　　　　　　　　　　　　　　　　　　　　　# 暴露的端口
[ * ] > :
[ * ] + tcp
[ * ] > :
[ * ] + tcp

　　由上可知，关于docker镜像的一些信息。

Analyze

[root@localhost docker]# dockerscan image analyze mysql.tar 　　　　# analyze分析docker镜像
[ * ] Starting the analysis of docker image…
[ * ] Selected image: 'mysql.tar'
[ * ] Analysis finished. Results:
[ * ] - Running user = root # 功能有限，仅能分析出是以root运行

Extract

[root@localhost docker]# dockerscan image extract ./mysql.tar ./mysql # 提取镜像文件
[ * ] Starting the extraction of docker image…
[ * ] Selected image: 'mysql.tar'
[ * ] Image content extracted
root@localhost docker]# ls mysql # mysql文件夹下就是典型的linux文件系统目录结构 bin boot dev docker-entrypoint-initdb.d entrypoint.sh etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
[root@localhost docker]# cat .**/mysql/etc/passwd | head - ** # 查看/etc/passwd文件内容
root❌::root:/root:/bin/bash
daemon❌::daemon:/usr/sbin:/usr/sbin/nologin
bin❌::bin:/bin:/usr/sbin/nologin