[Bug libc/11134] getpwnam shows shadow passwords of NIS users

[Christoph dot Pleger at cs dot tu-dortmund dot de]

------- Additional Comments From Christoph dot Pleger at cs dot tu-dortmund dot de  2010-02-17 13:15 -------
Hello,

I am sorry that my patch for the NIS shadow password security
vulnerability introduced a new bug. One of my NIS users informed me
that she could not login any more after she had used chsh to change her
login shell. The reason was that in the shadow file, the encrypted
password had been replaced by an 'x'. This happens because in my
patch, file nis-pwd.c, the string "##<username>" is replaced with "x". 

I thought that this replacement is necessary to let libc6 search for
the encrypted password in the shadow map. But now I found out that it
is not necessary and that without it everything works fine: logging in,
changing password and changing the shell.


I have attached a new patch that simply lets the password field of the
passwd.byname map alone.

Regards
  Christoph

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http://sourceware.org/bugzilla/show_bug.cgi?id=11134

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