Vixual

据说 Perl 可能是近几年会消失的 5 种程式语言之一，另外 4 个语言则是 Ruby、Haskell、Object-C 跟 R! 现在在 VScode 建立 Perl 的程式开发环境算是帮 Perl 续一下命，大慈大悲、功德无量。

在 VScode 建立 Perl 的开发环境主要分为三个步骤:

1. 安装 Perl 的执行环境
2. 安装 VScode IDE
3. 在 VScode 安装 Perl 的延伸模组 (Extension)

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弱点扫瞄

弱点: TLS Service Supports Weak Cipher Suite

Transport Layer Security (TLS), the successor to Secure Socket Layer (SSL), is a network protocol that encrypt communications between TLS servers (e.g., websites) and TLS clients (e.g., web browsers). Every communication is secured by a cipher suite: a combination of several algorithms working in concert. Cryptographic algorithms do not have a defined lifetime, but academics, researchers, and nation states are constantly evaluating them for weaknesses. Consensus on which algorithms are untrustworthy evolves over time, and if a communication is protected with a weak cipher suite then that communication can be altered or decrypted.

• Severity: Medium
• Risk: A TLS service was observed supporting weak cipher suites.
• Recommendation: Disable the cipher suites listed in the evidence column of the measurement.

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弱点扫瞄

弱点 1: SSH Supports Weak Cipher

The SSH server is configured to support either Arcfour or Cipher Block Chaining (CBC) mode cipher algorithms. SSH can be configured to use Counter (CTR) mode encryption instead of CBC. The use of Arcfour algorithms should be disabled.

• Severity: Medium
• Risk: A weak cipher has been detected.
• Recommendation: Configure the SSH server to disable Arcfour and CBC ciphers.

弱点 2: SSH Supports Weak MAC

The SSH server is configured to support MD5 algorithm. The cryptographic strength depends upon the size of the key and algorithm that is used. A Modern MAC algorithms such as SHA1 or SHA2 should be used instead.

• Severity: Medium
• Risk: A weak Message Authentication Code (MAC) algorithm has been detected.
• Recommendation: Configure the SSH server to disable the use of MD5.

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弱点扫瞄

弱点: SSL/TLS Service Supports Weak Protocol

Transport Layer Security (TLS), the successor to Secure Socket Layer (SSL), is a network protocol that encrypt communications between TLS servers (e.g., websites) and TLS clients (e.g., web browsers). Every communication is secured by a cipher suite: a combination of several algorithms working in concert. Networking protocols do not have a defined lifetime, but academics, researchers, and nation states are constantly evaluating them for weaknesses. Consensus on which protocols are untrustworthy evolves over time, and if communications are sent with a weak protocol then that communication can be altered or decrypted.

• Severity: High
• Risk: A TLS service was observed supporting weak protocols.
• Recommendation: Disable the protocols listed in the evidence column of the measurement.

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弱点扫瞄

弱点: Site does not enforce HTTPS

The site responds to HTTP requests without ultimately redirecting the browser to a secure version of the page. Since the site allows plaintext traffic, a man-in-the-middle attacker is able to read and modify any information passed between the site and the user. There are a variety of situations in which an attacker can intercept plaintext traffic in a man-in-the-middle position, including but not limited to:

1. Open Wi-Fi Hotspots
2. WPA/WPA2 encrypted hot-spots where the attacker connected before the victim
3. Malicious Wi-Fi access points
4. Compromised switches and routers
5. ARP poisoning on the same wired network

It's important to remember that in many of the above situations, an attacker can not only read traffic, but also actively modify the traffic. Even if a site that does not contain sensitive information, an attacker can still inject malicious content to a user’s browser.

• Severity: High
• Risk: Site does not enforce the use of HTTPS encryption, leaving the user vulnerable to man-in-the-middle attackers (who can falsify data and inject malicious code).
• Recommendation: Any site served to a user (possibly at the end of a redirect chain) should be served over HTTPS.

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Android Auto 车机的 GPS 定位问题

我的车机是 Pioneer AVH-Z9250BT，手机是小米 12，我通常是使用无线的方式连接车机的 Android Auto。

不过在车机上的 Android Auto 使用 Google Maps 导航时，偶尔会出现行车位置漂移、GPS 讯号中断、正在搜寻 GPS 讯号，或无法显示地图...之类的问题! 但是同一时间，如果我开启手机上的导航王来查看，导航王的定位却又无比正确!

原本以为是我的车机太烂，或有相容性的问题，上网寻找答案，又发现很多网友有同样的问题，其中也不乏一些百万名车内建的车机! 幸好有找到解决方法!
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若执行 yum 出现:

http://mirror.centos.org/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below knowledge base article

表示系统默认的 yum 套件库可能已经不存在!

我们可以在 vault.centos.org 找到可用的套件库来源:

• vault.centos.org: http
• archive.kernel.org: http - rsync (rsync://archive.kernel.org::centos-vault/)
• linuxsoft.cern.ch: http - rsync (rsync://linuxsoft.cern.ch/centos-vault/)
• mirror.nsc.liu: http - rsync (rsync://mirror.nsc.liu.se::centos-store/)

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安装流程

1. xrdp 是放在 EPEL 套件库，所以我们要先安装 EPEL。依据不同版本的 CentOS 请参考: CentOS 如何加入第三方 Yum 套件库: EPEL。
2. 安装 xrdp 及 tigervnc server:

yum install xrdp tigervnc-server

3. 启动 xrdp

service xrdp start

4. 加到开机自动执行

chkconfig xrdp on

PS. 只要启动 xrdp 即可，tigervnc server 装好后就不用理它了。

设定与登入

设定与登入的方式与之前的教学一样，请自行参考。

参考网页

1. 安装 xrdp v0.6.0 (原始档)
2. Linux 上的远端桌面中继程式: xrdp (v0.4.2)
3. CentOS 如何加入第三方 Yum 套件库: EPEL

为什么要停用 IPv6?

1. 不熟、抗拒学习
2. IPv6 也要设 IP 反解 PTR
3. Gmail 会挡没有设 IPv6 反解的邮件

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EPEL 的全称为“Extra Packages for Enterprise Linux”，是由 Fedora 社群打造，为 RHEL 及衍生发行版如 CentOS、Scientific Linux、Rocky Linux、Oracle Linux...等提供高品质套件库的专案。装了 EPEL 之后，等于添加了一个资源丰富的第三方套件库。

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