The National Institute for Computational Sciences

Access and Login - SIP

There are two login nodes sip-login1 and sip-login2. sip-login1 is for use by UTHSC sponsored researchers and sip-login2 is for use by UTK sponsored researchers. To gain access to SIP resources three things are needed: access to a project with an account on the SIP, access to the SIP bastion host, and a UT NetID and password along with access to use one of the supported multi-factor authentications (MFA) capabilities of Duo or RSA.

ACF SIP Bastion Host NameIP AddressAuthentication SupportedFile System Access
sip-bh1.nics.utk.edu 192.249.8.60NICS username + RSANone
ACF Login Host Name for UTHSCIP AddressAuthentication SupportedFile System Access
sip-login1.nics.utk.edu,
sip-login1.nics.tennessee.edu
192.249.8.91NICS username + RSAHome,
/lustre/sip
ACF Login Host Name for UTKIP AddressAuthentication SupportedFile System Access
sip-login2.nics.utk.edu,
sip-login2.nics.tennessee.edu
192.249.8.92NICS username + RSAHome,
/lustre/sip

Projects and Accounts

UTK and UTHSC researchers can get an account on the ACF Open side by claiming an account using the UT NetID at this form. Once you have an account on the ACF Open side you can request a SIP project by sending a support ticket to help@nics.utk.edu or by creating a project by logging into the portal and requesting a project.

Bastion Host Access

Once you obtain a SIP project you will be added to a SIP bastion host. This will be done for you as part of the process to create a SIP project. The SIP bastion hosts are created to provide controlled access system to restrict access from remote locations to the SIP resources. To gain access to the SIP login nodes one has to login to a SIP bastion host then login to the SIP login node. This allows more open access to SIP resources from computers on the UTK and UTHSC networks without having to manage individual SIP firewall rules for all systems that want to access. Access to the bastion host will be allowed from the UTHSC and UTK managed networks including the VPNs. By allowing the VPNs this allows users to use portable devices on networks outside of UTK and UTHSC, connect to the VPN to get on the UTK or UTHSC network and then access SIP resources through the SIP bastion hosts.

Multi-Factor Authentication (MFA)

Access to SIP resources requires NetID, password and MFA for authentication. Currently only RSA MFA is enabled on the SIP bastion hosts and SIP login nodes. RSA is a MFA method using hardware tokens. If you do not have an RSA token, the submit a request via the help system at help@nics.utk.edu requesting an RSA token. Once you have an RSA token then you will be able to use it to login to the SIP bastion host and then the SIP login nodes

RSA SecurID

RSA Keyfob

Logging in with OTP requires using a personal PIN plus the current code displayed on the token—this combination is referred to as your passcode. Along with your token, you will receive instructions on setting up your PIN for the first time. Use SSH along with your passcode to log in to resources, for example:

> ssh <username>@sip-login1.acf.tennessee.edu
Enter PASSCODE:

Note: No characters will appear when entering passcode.

About SSH

UNIX-based operating systems generally have an SSH client built in and Windows users may obtain free clients online, such as PuTTY.

Any SSH client used to log into resources should:

  • Support the SSH-2 protocol (supported by all modern SSH clients). Several security vulnerabilities exist in the SSH-1 protocol, therefore, access using a version 1 client is not allowed.
  • Support the encryption algorithms that our Secure Shell server version 5.8 supports.
  • Allow keyboard-interactive authentication to access NICS systems. For UNIX-based SSH clients, the following line should be in either the default ssh_config file or your  $HOME/.ssh/config file:
    PreferredAuthentications keyboard-interactive,password
    
    The line may also contain other authentication methods, so long as keyboard-interactive is included. For recent versions of SecureCRT or PuTTY, the setting can be made through the SSH connection properties menu.

Other Login Issues

Inactive accounts

Accounts that are not used for a period of three consecutive months are disabled. If you believe your account has been disabled for inactivity please submit a request to help@nics.utk.edu.

RSA Key Fingerprints

Occasionally, you may receive an error message upon logging in to a system such as the following:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the OTP host key has just been changed.

This can be a result of normal system maintenance that changes an RSA public key or could be an actual security incident. If these fingerprints do not match what your SSH/SCP/SFTP client shows you, do not continue authentication; instead, contact help@nics.utk.edu.

X11 and Other Port Forwarding

X11 forwarding is not allowed currently through the SIP bastion hosts. Also, no other port forwarding is allowed through the bastion hosts.

Changing Default Shell

You may change your default shell, by logging into the NICS User portal. After logging in to the portal, you may change your shell in the 'Login Information' section.

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