vault backup: 2024-09-12 17:36:52

cmgzn · Sep 12, 2024 · ec5dc56 · ec5dc56
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diff --git a/.obsidian/plugins/obsidian-git/data.json b/.obsidian/plugins/obsidian-git/data.json
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diff --git a/_posts/pool/2024-09-12-记一次离奇的linux-ssh登录bug.md b/_posts/pool/2024-09-12-记一次离奇的linux-ssh登录bug.md
@@ -0,0 +1,48 @@
+---
+title: 记一次离奇的linux-ssh登录bug
+author: X
+date: 2024-09-12 17:16:10 +0800
+categories:
+  - debug
+  - linux
+tags:
+  - linux
+  - ssh
+---
+遇到了一个脑瘫错误，查了半天查到一样的问题
+
+https://askubuntu.com/questions/1404304/sudo-su-command-not-working-su-failed-to-execute-root-no-such-file-or-director
+
+目前已根据文档中提到的方法解决，即修改`/etc/passwd`文件中的`root:x:0:0:root:/root:root`。当然，在我的问题里，这个错误行是`root:x:0:0:root:/root:myusername`
+
+具体是什么原因引起的已经不可追溯了，推测与我想修改新用户的shell时执行的一些操作有关，例如`chsh`相关操作。
+
+实际上这个问题并不是我在切换用户时发现的，而是连接ssh时突然连不上了，报错belike：
+
+```
+[16:40:45.445] Got some output, clearing connection timeout
+[16:40:45.642] > root@xxxhost: Permission denied (publickey).
+[16:40:45.663] > 过程试图写入的管道不存在。
+```
+
+还好此时我还有一个vscode窗口是连着这个服务器的root账号的，真是吓出一身冷汗，立刻开始搜索办法。结果当然是五花八门，笔者大量使用`sudoedit /etc/ssh/sshd_config`来修改ssh设定，依旧没有任何用处，期间还检查了`.ssh`下的公钥，也都是正确的。
+
+所以说debug是非常看运气的，主要这个环节的报错是**Permission denied (publickey)**，可以说相当具有迷惑性了，想到切换用户也只是病急乱投医地碰运气，思路是回溯出错环节->之前设置新用户相关时，发现切换用户需要密码，因此重设了root密码->想着再切换一次用户（这个思路是多么离奇，正常来说是完全无用的行为）->发现切不回去了->发现事情真相……
+
+是的，聪明的你已经发现了，最终错因与重设root密码这一操作完全没有关系，这就是debug的魅力，即毫无方法论，除非你有很强的知识储备。然而知识不就是在无数次没头脑的debug中学习的吗？
+
+另，补充修改系统文件的命令：
+```bash
+sudo nano /etc/passwd
+```
+或：
+```bash
+sudoedit /etc/passwd
+```
+
+编辑完成后，`ctrl+X`保存退出。
+
+有时修改前也要注意备份，养成好习惯：
+```bash
+sudo cp /etc/passwd /etc/passwd.bak
+```