Tip

Solaris Web services security: Set file permissions

Set File Permissions
Limit non-root Access to System Files and Directories
Make the following changes from the command line:

chown root /etc/mail/aliases

chmod 644 /etc/mail/aliases
chmod 444 /etc/default/login
chmod 750 /etc/security

chmod 000 /usr/bin/at
chmod 500 /usr/bin/rdist
chmod 400 /usr/sbin/snoop
chmod 400 /usr/sbin/sync
chmod 400 /usr/bin/uudecode
chmod 400 /usr/bin/uuencode

chmod u-s /usr/lib/fs/ufs/ufsdump
chmod u-s /usr/lib/fs/ufs/ufsrestore

Remove SetGID Permissions From System Files
Make the following manual changes.
chmod g-s /usr/bin/mail
chmod g-s /usr/bin/mailx
chmod g-s /usr/bin/write
chmod g-s /usr/bin/netstat
chmod g-s /usr/bin/nfsstat
chmod g-s /usr/bin/ipcs

chmod g-s /usr/sbin/arp
chmod g-s /usr/sbin/dmesg
chmod g-s /usr/sbin/prtconf
chmod g-s /usr/sbin/swap
chmod g-s /usr/sbin/sysdef
chmod g-s /usr/sbin/wall


chmod g-s /usr/lib/fs/ufs/ufsdump
chmod g-s /usr/lib/fs/ufs/ufsrestore

Prohibit the Execution of SetUID Programs
To prevent execution of setuid programs, use the nosuid option in /etc/vfstab.

The /usr file system contains some setuid executables essential to system operation. It is recommended it be mounted read-only instead of using the nosuid option.

/proc - /proc proc - no

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-
fd - /dev/fd fd - no -
swap - /tmp tmpfs - yes -
/dev/dsk/c0t3d0s1 - - swap - no -
/dev/dsk/c0t3d0s0 /dev/rdsk/c0t3d0s0 / ufs 1 no remount,nosuid
/dev/dsk/c0t3d0s4 /dev/rdsk/c0t3d0s4 /usr ufs 1 no ro
/dev/dsk/c0t3d0s5 /dev/rdsk/c0t3d0s5 /var ufs 1 no nosuid


In this 12-part tip Unix expert Gary Smith breaks down the process of building and maintaining a highly secure Web services architecture on the Solaris platform.

Table of contents:
Part 1: Isolate the Web services host server
Part 2: Install and configure a very basic operating system
Part 3: Force the use of su to gain root access
Part 4: Disable trusted host relationships and create a warning banner
Part 5: Configuring user accounts
Part 6: Disabling and removing unnecessary accounts
Part 7: Configure network access control
Part 8: Configure network services
Part 9: Install OpenSSH, disable NFS and reboot
Part 10: Set file permissions
Part 11: Test the configuration
Part 12: Conclusion

This was first published in October 2002

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