文章

发布于

Following the takeover of LTT channel, it is time to revisit session cookies

Google article: Phishing campaign targets YouTube creators with cookie theft malware

With 2-factor authentication becoming more and more main-stream nowadays, attackers turn back to the ancient way – tricking people into downloading malware, thus getting the cookies information stored on their local computer, and being able to log in to their active accounts using those session cookies.

It seems that a qualified security software on a Windows system is still a must, and isn’t leaving any day soon.

发布于

靜候事故報告的阿里雲多區可用性疑惑

阿里雲故障公告：https://www.alibabacloud.com/zh/notice/repair1218

一般來說，一個地域的一個可用區故障不可怕，然而阿里雲本次香港 C 區帶來的後果卻更像一個地域故障。中控基本不可用，自己在 C 區的 ECS 資源經過了 10+ 小時未恢復。多家報障的大型客戶理應有多可用區的設定，卻也未能恢復服務。實在是令人質疑阿里雲的多可用區設計。

更新：事後複盤報告 – https://www.alibabacloud.com/zh/notice/066572

发布于

Just a very good video to learn about the foundations of Cloud Spanner:

https://www.youtube.com/watch?v=QPpSzxs_8bc

发布于

隨記

久違的看了一眼服務器的監控圖表，發現連接數異常的多（對比網站流量來說），奇怪的打開了 netstat / tcpdump，一臉 SYN_RECV。

雖然不至於造成 SYN FLOOD，直接把來源 IP 段 BAN 了了事。（然後換成一堆 AWS 的 IP 段發過來了，好傢伙…）

新部署：

iptables -A INPUT -p tcp --dport 80 -m state --state NEW -m recent --update --seconds {value} --hitcount {value} --name "syn-fw" -j DROP
iptables -A INPUT -p tcp --dport 80 -m state --state NEW -m recent --set --name "syn-fw"
iptables -A INPUT -p tcp --dport 80 -m state --state NEW -m recent --update --seconds {value} --hitcount {value} --name "syn-fw" -j LOG --log-prefix "[syn-fw] " --log-level 4


Refs:
https://serverfault.com/a/1033162
http://www.snowman.net/projects/ipt_recent/

  • Bonus：Fail2ban filter


    • [INCLUDES]
    before = common.conf

    [Definition]
    _daemon = kernel
    failregex = ^%(__prefix_line)s\[syn-fw\].*SRC=<HOST> DST=.*$
    ignoreregex =

    发布于

    The new era

    # nginx -V
nginx version: nginx/1.21.3
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)
built with OpenSSL 3.0.0 7 sep 2021
TLS SNI support enabled
configure arguments: --with-openssl=.../openssl-3.0.0 --with-openssl-opt='enable-ec_nistp_64_gcc_128 enable-tls1_3'

    Took such a long time to compile though… 😅

    发布于

    Safer everyday, just a memo

    早就應該給伺服器的數據庫備份加密了，現在終於加上了。

    Should have encrypted the database backup already, finally changed it.

    [crontab time] /usr/bin/tar czf - -C /etc/nginx . | /usr/local/bin/openssl enc -aes-256-cbc -pbkdf2 -k [password] > /backup/nginx.tar.gz.enc

    [crontab time] /usr/bin/mysqldump -u root --all-databases | /usr/local/bin/openssl enc -aes-256-cbc -pbkdf2 -k [password] > /backup/all-databases.sql.enc