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Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 443 Configuration of the “/etc/ftpusers” file The “/etc/ftpusers” file specifies those users that are NOT allowed to connect to your FTP server. Step 1 Create the ftpusers file (touch /etc/ftpusers) and add in this file the following users for security reasons: root bin daemon adm  lp sync shutdown halt mail news  uucp operator games  nobody Step 2 Now, change its default permission to be 600: [root@deep /]# chmod 600 /etc/ftpusers Configuration of the “/etc/ftpconversions” file The “/etc/ftpconversions” file contain instruction that permit to compress files on demand before the transfer. Step 1 Edit the ftpconversions file (vi /etc/ftpconversions) and add in this file the following lines: :.Z:  :  :/bin/compress -d -c %s:T_REG|T_ASCII:O_UNCOMPRESS:UNCOMPRESS :   : :.Z:/bin/compress -c %s:T_REG:O_COMPRESS:COMPRESS :.gz: :  :/bin/gzip -cd %s:T_REG|T_ASCII:O_UNCOMPRESS:GUNZIP :   : :.gz:/bin/gzip -9 -c %s:T_REG:O_COMPRESS:GZIP :   : :.tar:/bin/tar -c -f - %s:T_REG|T_DIR:O_TAR:TAR :   : :.tar.Z:/bin/tar -c -Z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+COMPRESS :   : :.tar.gz:/bin/tar -c -z -f - %s:T_REG|T_DIR:O_COMPRESS|O_TAR:TAR+GZIP :   : :.crc:/bin/cksum %s:T_REG::CKSUM :   : :.md5:/bin/md5sum %s:T_REG::MD5SUM Step 2 Now, change its default permission to be 600: [root@deep /]# chmod 600 /etc/ftpconversions Configuration of the “/etc/pam.d/ftp” file Configure your “/etc/pam.d/ftp” file to use pam authentication. Create the ftp file (touch /etc/pam.d/ftp) and add the following lines: