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User Switcher, just like sudo but worse
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todo and notes added two files, TODO: things that still need to be taken care of that may be too long to write in the source code config.template: mockups of the config file
4 years ago
- Modify the following environment variables: (listed in environ(7))
* USER -> to target user
* LOGNAME -> to target user
* SHELL -> to the target user's SHELL
* HOME -> to the target user's HOME
touches to shell proxy reworked the privilege escalation works by changing the way target user info is passed around, now we pass struct passwd* and struct group* instead of strings wich allows much greater flexibility. Also now us mimics the behavior of sudo and doas regarding the shell proxies: - commands are started under a subshell, that shell is the user's - if no command is specified just the shell is executed
4 years ago
reverted to the old exec way this branch will contain a version of us which doesn't use a subshell as a proxy but directly applies the privilege escalation to the command
4 years ago
- fork before exec, that is because processes might try to kill us or the
command but since they may run under elevated privileges they will get
permission denied error. If we remain the parent processes, unprivileged
proceses can send signals to us and we will relay them to our children
running at the same privilege as us. This is useful when:
- The child command hangs and we want to cose it, kinda
problematic but we could run kill with us as well
- The parent shell dies and children need to be killed, then
since one of their children (us) has higher privileges
they can't kill us and we would end up as zombies