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System Administration Guide: Security Services Oracle Solaris 10 8/11 Information Library |
1. Security Services (Overview)
Part II System, File, and Device Security
2. Managing Machine Security (Overview)
3. Controlling Access to Systems (Tasks)
4. Controlling Access to Devices (Tasks)
5. Using the Basic Audit Reporting Tool (Tasks)
6. Controlling Access to Files (Tasks)
7. Using the Automated Security Enhancement Tool (Tasks)
Part III Roles, Rights Profiles, and Privileges
8. Using Roles and Privileges (Overview)
9. Using Role-Based Access Control (Tasks)
10. Role-Based Access Control (Reference)
Part IV Cryptographic Services
13. Oracle Solaris Cryptographic Framework (Overview)
14. Oracle Solaris Cryptographic Framework (Tasks)
15. Oracle Solaris Key Management Framework
Part V Authentication Services and Secure Communication
16. Using Authentication Services (Tasks)
19. Using Oracle Solaris Secure Shell (Tasks)
Oracle Solaris Secure Shell and the OpenSSH Project
Oracle Solaris Secure Shell (Task Map)
Configuring Oracle Solaris Secure Shell (Task Map)
Configuring Oracle Solaris Secure Shell (Tasks)
How to Set Up Host-Based Authentication for Secure Shell
How to Configure Port Forwarding in Secure Shell
Using Oracle Solaris Secure Shell (Task Map)
Using Oracle Solaris Secure Shell (Tasks)
How to Generate a Public/Private Key Pair for Use With Secure Shell
How to Change the Passphrase for a Secure Shell Private Key
How to Log In to a Remote Host With Secure Shell
How to Reduce Password Prompts in Secure Shell
How to Set Up the ssh-agent Command to Run Automatically in CDE
How to Use Port Forwarding in Secure Shell
How to Copy Files With Secure Shell
How to Set Up Default Connections to Hosts Outside a Firewall
20. Oracle Solaris Secure Shell (Reference)
21. Introduction to the Kerberos Service
22. Planning for the Kerberos Service
23. Configuring the Kerberos Service (Tasks)
24. Kerberos Error Messages and Troubleshooting
25. Administering Kerberos Principals and Policies (Tasks)
26. Using Kerberos Applications (Tasks)
27. The Kerberos Service (Reference)
Part VII Oracle Solaris Auditing
28. Oracle Solaris Auditing (Overview)
29. Planning for Oracle Solaris Auditing
30. Managing Oracle Solaris Auditing (Tasks)
In Secure Shell, authentication is provided by the use of passwords, public keys, or both. All network traffic is encrypted. Thus, Secure Shell prevents a would-be intruder from being able to read an intercepted communication. Secure Shell also prevents an adversary from spoofing the system.
Secure Shell can also be used as an on-demand virtual private network (VPN). A VPN can forward X Window system traffic or can connect individual port numbers between the local machines and remote machines over an encrypted network link.
With Secure Shell, you can perform these actions:
Log in to another host securely over an unsecured network.
Copy files securely between the two hosts.
Run commands securely on the remote host.
Secure Shell supports two versions of the Secure Shell protocol. Version 1 is the original version of the protocol. Version 2 is more secure, and it amends some of the basic security design flaws of version 1. Version 1 is provided only to assist users who are migrating to version 2. Users are strongly discouraged from using version 1.
Note - Hereafter in this text, v1 is used to represent version 1, and v2 is used to represent version 2.
Secure Shell provides public key and password methods for authenticating the connection to the remote host. Public key authentication is a stronger authentication mechanism than password authentication, because the private key never travels over the network.
The authentication methods are tried in the following order. When the configuration does not satisfy an authentication method, the next method is tried.
GSS-API – Uses credentials for GSS-API mechanisms such as mech_krb5 (Kerberos V) and mech_dh (AUTH_DH) to authenticate clients and servers. For more information on GSS-API, see Introduction to GSS-API in Developer’s Guide to Oracle Solaris Security.
Host-based authentication – Uses host keys and rhosts files. Uses the client's RSA and DSA public/private host keys to authenticate the client. Uses the rhosts files to authorize clients to users.
Public key authentication – Authenticates users with their RSA and DSA public/private keys.
Password authentication – Uses PAM to authenticate users. Keyboard authentication method in v2 allows for arbitrary prompting by PAM. For more information, see the SECURITY section in the sshd(1M) man page.
The following table shows the requirements for authenticating a user who is trying to log into a remote host. The user is on the local host, the client. The remote host, the server, is running the sshd daemon. The table shows the Secure Shell authentication methods, the compatible protocol versions, and the host requirements.
Table 19-1 Authentication Methods for Secure Shell
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For a comprehensive discussion of Secure Shell on an Oracle Solaris system, see Secure Shell in the Enterprise, by Jason Reid, ISBN 0-13-142900-0, June 2003. The book is part of the Sun BluePrints Series published by Sun Microsystems Press.