Vixual

據說 Perl 可能是近幾年會消失的 5 種程式語言之一，另外 4 個語言則是 Ruby、Haskell、Object-C 跟 R! 現在在 VScode 建立 Perl 的程式開發環境算是幫 Perl 續一下命，大慈大悲、功德無量。

在 VScode 建立 Perl 的開發環境主要分為三個步驟:

1. 安裝 Perl 的執行環境
2. 安裝 VScode IDE
3. 在 VScode 安裝 Perl 的延伸模組 (Extension)

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弱點掃瞄

弱點: 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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弱點掃瞄

弱點 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.

弱點 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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弱點掃瞄

弱點: 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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弱點掃瞄

弱點: 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 車機的 GPS 定位問題

我的車機是 Pioneer AVH-Z9250BT，手機是小米 12，我通常是使用無線的方式連接車機的 Android Auto。

不過在車機上的 Android Auto 使用 Google Maps 導航時，偶爾會出現行車位置漂移、GPS 訊號中斷、正在搜尋 GPS 訊號，或無法顯示地圖...之類的問題! 但是同一時間，如果我開啟手機上的導航王來查看，導航王的定位卻又無比正確!

原本以為是我的車機太爛，或有相容性的問題，上網尋找答案，又發現很多網友有同樣的問題，其中也不乏一些百萬名車內建的車機! 幸好有找到解決方法!
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若執行 yum 出現:

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

表示系統預設的 yum 套件庫可能已經不存在!

我們可以在 vault.centos.org 找到可用的套件庫來源:

• 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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安裝流程

1. xrdp 是放在 EPEL 套件庫，所以我們要先安裝 EPEL。依據不同版本的 CentOS 請參考: CentOS 如何加入第三方 Yum 套件庫: EPEL。
2. 安裝 xrdp 及 tigervnc server:

yum install xrdp tigervnc-server

3. 啟動 xrdp

service xrdp start

4. 加到開機自動執行

chkconfig xrdp on

PS. 只要啟動 xrdp 即可，tigervnc server 裝好後就不用理它了。

設定與登入

設定與登入的方式與之前的教學一樣，請自行參考。

參考網頁

1. 安裝 xrdp v0.6.0 (原始檔)
2. Linux 上的遠端桌面中繼程式: xrdp (v0.4.2)
3. CentOS 如何加入第三方 Yum 套件庫: EPEL

為什麼要停用 IPv6?

1. 不熟、抗拒學習
2. IPv6 也要設 IP 反解 PTR
3. Gmail 會擋沒有設 IPv6 反解的郵件

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EPEL 的全稱為「Extra Packages for Enterprise Linux」，是由 Fedora 社群打造，為 RHEL 及衍生發行版如 CentOS、Scientific Linux、Rocky Linux、Oracle Linux...等提供高品質套件庫的專案。裝了 EPEL 之後，等於添加了一個資源豐富的第三方套件庫。

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