Search notes:

/etc/shadow

This file should only be accessible to root. It contains the password's hashes for the users listed in /etc/passwd.
An /etc/shadow file can be created from an /etc/passwd file with pwconv.

Group-owner shadow

The group-owner of /etc/shadow is shadow. Some programs that need to be able to access the file are setgid shadow.
The following shell construct finds such files which are in the $PATH variable: 
# ( IFS=:
  for path in $PATH; do
      find $path -type f -group shadow -perm -g=s
  done
)
/usr/sbin/unix_chkpwd
/usr/bin/chage
/usr/bin/expiry

See also

security
lslogins (part of util-linux).

Index

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