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How do I add users using Python scripts on a Linux machine

How do I add users using Python scripts on a Linux machine?

Someone has a script?

Jan 1 '07
20 18901
In message <m2************ @ordesa.lan>, Piet van Oostrum wrote:
Lawrence D'Oliveiro <ld*@geek-central.gen.new _zealand(LD) wrote:
In message <m2************ @ordesa.cs.uu.n l>, Piet van Oostrum wrote:
>The scenario is as follows: Suppose the script starts with the line:
#!/usr/bin/python

(using #!/usr/bin/env python would be disastrous because the user could
supply his own `python interpreter' in his PATH.)

Now a malicious user can make a link to this file in his own directory,
e.g. to /Users/eve/myscript1. Because permissions are part of the file
(inode), not of the file name, this one is also suid.

Now she execs /Users/eve/myscript1. The kernel, when honoring suid
scripts, would startup python with effective uid root with the command
line: /usr/bin/env /Users/eve/myscript1

LDNo it wouldn't. This security hole was fixed years ago.

How?
Systems which allow set-uid scripts also usually support referring to open
file descriptors n via a pathname like /dev/fd/n. This might be done by
mounting a special pseudo-filesystem (fdfs) on /dev/fd. (This was how I
remember it being done on DEC UNIX.)

So when a the kernel detects that an executable file is actually a script,
it opens the script file on some file descriptor n, and passes the
name /dev/fd/n to the script interpreter, instead of the original script
pathname. That way, there is no opportunity for deceiving the process into
executing the wrong script with set-uid privileges.
Jan 10 '07 #21

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