Crystal lang 进程是否可以更改其用户(euid/uid)?

问题描述

如果 Crystal 语言进程以 root 身份运行，是否可以将其 euid/uid 更改为其他内容?例如:

If a Crystal language process is running as root, can it change it's euid/uid to something else? For example:

 old_euid, old_ui = Process.euid, Process.uid
 Process.euid = someone_else
 Process.uid  = someone_else

推荐答案

是的，通过使用 libc 绑定:

Yes, by using bindings to libc:

lib LibC
  fun setuid(uid_t : Int)
  fun getuid : Int
end

LibC.getuid                         #=> 0
Process.run("whoami", output: true) #=> root

LibC.setuid(uid)
LibC.getuid                         #=> my uid
Process.run("whoami", output: true) #=> my user name

程序当然需要以root身份运行(即sudo crystal source.cr)

The program needs to be running as root of course (i. e. sudo crystal source.cr)

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