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Configuring Telnet and Ftp
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Transcript of Configuring Telnet and Ftp
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8/4/2019 Configuring Telnet and Ftp
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Configuring Telnet/FTP to login as root (Linux)
by Jeff Hunter, Sr. Database Administrator
Contents
1. Red Hat Enterprise Linux: RHEL3 / RHEL4
2. Red Hat (Fedora Core 1 / Core 2)
3. Red Hat (Release 7.x - 8.x)
Red Hat Enterprise Linux: RHEL3 / RHEL4
Enabling Telnet and FTP Services
Linux is configured to run the Telnet and FTP server, but by default, these
services are not enabled. To enable the telnet service, login to the server as
the root user account and run the following commands:
# chkconfig telnet on# service xinetd reloadReloading configuration: [ OK ]
Starting with the Red Hat Enterprise Linux 3.0 release (and in CentOS
Enterprise Linux), the FTP server(wu-ftpd) is no longer available withxinetd. It has been replaced withvsftp and can be started from
/etc/init.d/vsftpd as in the following:
# /etc/init.d/vsftpd startStarting vsftpd for vsftpd: [ OK ]
If you want the vsftpd service to start and stop when recycling (rebooting)
the machine, you can create the following symbolic links:
# ln -s /etc/init.d/vsftpd /etc/rc3.d/S56vsftpd# ln -s /etc/init.d/vsftpd /etc/rc4.d/S56vsftpd
# ln -s /etc/init.d/vsftpd /etc/rc5.d/S56vsftpd
Allowing Root Logins to Telnet and FTP Services
Now before getting into the details of how to configure Red Hat Linux for
root logins, keep in mind that this is VERY BAD security. Make sure that
you NEVER configure your production servers for this type of login.
Configure Telnet for root logins
Simply edit the file /etc/securetty and add the following to the end of
the file:
http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(RHEL3%20/%20RHEL4)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(RHEL3%20/%20RHEL4)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Fedora%20Core%201%20/%20Core%202)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Fedora%20Core%201%20/%20Core%202)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Release%207.x%20-%208.x)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Release%207.x%20-%208.x)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(RHEL3%20/%20RHEL4)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Fedora%20Core%201%20/%20Core%202)http://www.idevelopment.info/data/Unix/Linux/#Red%20Hat%20(Release%207.x%20-%208.x) -
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pts/0pts/1pts/2pts/3pts/4pts/5
pts/6pts/7pts/8pts/9
This will allow up to 10 telnet sessions to the server as root.
Configure FTP for root logins
Edit the files /etc/vsftpd.ftpusers and /etc/vsftpd.user_listand
remove the 'root' line from each file.
Red Hat (Fedora Core 1 / Core 2)
Enabling Telnet and FTP Services
Linux is configured to run the Telnet and FTP server, but by default, these
services are not enabled. To enable the telnet these service, login to the
server as the root userid and edit the files:
/etc/xinetd.d/telnet
In this file, find the line fordisable and change it from the value "yes" to
"no".
After changing the above value(s), you will need to restart the xinetd
deamon. As the root userid, type the following command:
% /etc/init.d/xinetd reload
Starting with the Fedora Core 1 release, the FTP server(wu-ftpd) is nolonger available with xinetd. It has been replaced withvsftp and can be
started from /etc/init.d/vsftpd as in the following:
# /etc/init.d/vsftpd start
If you want the vsftpd service to start and stop when recycling the
machine, you can create the following symbolic links:
# ln -s /etc/init.d/vsftpd /etc/rc3.d/S56vsftpd# ln -s /etc/init.d/vsftpd /etc/rc4.d/S56vsftpd
# ln -s /etc/init.d/vsftpd /etc/rc5.d/S56vsftpd
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Allowing Root Logins to Telnet and FTP Services
Now before getting into the details of how to configure Red Hat Linux for
root logins, keep in mind that this is VERY BAD security. Make sure that
you NEVER configure your production servers for this type of login.
Configure Telnet for root logins
Simply edit the file /etc/securetty and add the following to the end of
the file:
pts/0pts/1pts/2pts/3pts/4pts/5
pts/6pts/7pts/8pts/9
This will allow up to 10 telnet sessions to the server as root.
Configure FTP for root logins
Edit the files /etc/vsftpd.ftpusers and /etc/vsftpd.user_listand
remove the 'root' line from each file.
Red Hat (Release 7.x - 8.x)
Enabling Telnet and FTP Services
Linux is configured to run the Telnet and FTP server, but by default, these
services are not enabled. To enable these services, login to the server as the
root userid and edit the files:
/etc/xinetd.d/telnet
/etc/xinetd.d/wu-ftpd
In both files, find the line fordisable and change it from the value "yes" to
"no".
After changing the above values, you will need to restart the xinetd
deamon. As the root userid, type the following command:
% /etc/init.d/xinetd reload
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Allowing Root Logins to Telnet and FTP Services
Now before getting into the details of how to configure Red Hat Linux for
root logins, keep in mind that this is VERY BAD security. Make sure that
you NEVER configure your production servers for this type of login.
Configure Telnet for root logins
Simply edit the file /etc/securetty and add the following to the end of
the file:
pts/0pts/1pts/2pts/3pts/4pts/5
pts/6pts/7pts/8pts/9
This will allow up to 10 telnet sessions to the server as root.
Configure FTP for root logins
First edit the file /etc/ftpaccess and comment out the 'deny-uid' and
'deny-gid' lines.
Also, don't forget to remove the 'root' line from /etc/ftpusers