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There are a few precautions that can be taken to make NIS in Solaris more secure:
The whoami command replies with "no login associated with uid" if the effective UID of its process cannot be found in the password file. Other utilities that check the validity of UIDs are rcp, rlogin, and rsh, all of which generate "can not find password entry for user id" messages if the user's UID cannot be found in the password map.
Any remote user can issue an RPC call to ypserv and retrieve the contents of your NIS maps, provided the remote user knows NIS domainname. To prevent such unauthorized transactions, ypserv supports a feature called securenets which can be used to restrict access to a given set of hosts. At startup, ypserv will attempt to load /var/yp/securenets file that limits access to NIS services. If it exists after loading it, the server only answers queries/supplies maps to hosts and networks whose IP addresses exist in the file. The server must be able to access itself. Therefore the following entry should be present:
The following example describes a securenets file where:
After modification of the /var/yp/securenets file, you need to restart the ypserv and ypxfrd daemons:
# /usr/lib/netsvc/yp/ypstop && /usr/lib/netsvc/yp/ypstart
The passwd.adjunct file prevents disclosing the encrypted passwords that
normally form part of the output when viewing the NIS passwd maps to unauthoriaed
Encrypted passwords are normally hidden from the user in the /etc/shadow file. With the default NIS configuration, however, the encrypted password string is shown as part of the passwd maps.
The following example shows that if passwd.adjunct file exists, then user passwd is hidden from view when viewing the /etc/passwd file:
# cat /etc/passwd | grep joeuser
When the ypmatch command runs against the joeuser account value in the passwd map, the following output appears:
# ypmatch -k joeuser passwd
The encrypted user password is included as part of the NIS passwd maps. To maintain the same security, the system configures the passwd.adjunct file. The passwd.adjunct file contains the account name preceded by ## in the password field. After that the ypcat or ypmatch commands, returns the password entry from the passwd.adjunct file, as follows:
# ypmatch -k joeuser passwd
To enable the passwd.adjunct file you need to configure configure C2 security features. See http://sunsolve.sun.com for details.
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