What does SASL mean?

What is the difference between Kerberos and SASL?

Answer.

If you have a user account that requires authentication, the system will try to establish a connection with a specific authentication mechanism before continuing. In this case, the connection will most likely be made using Kerberos, since that is one of the available mechanisms.

Why would you want to connect to a remote machine using SASL? In addition to all the security benefits of using Kerberos over basic authentication, there are other reasons to prefer SASL over basic authentication. The primary reason is to use the secure socket layer (SSL) over SSH, which enables us to pass through the SSH tunnel an additional security layer. This additional layer is not only for authentication, but also to allow encryption for both data and other protocols (such as FTP, mail etc. This additional layer is called SASL.

You can also use SASL to connect to different machines by changing which authentication methods you would like to use. For example, if you would like to authenticate yourself, you could use anonymous (a username/password). However, if you have public key authentication set up, you could use GSSAPI, GSSAPI-Kerberos and SPNEGO (Negotiate) with the appropriate client and server software. If you use public key authentication, you would use the key provided when setting up the account in question. If you do not provide any key, the server will select one for you automatically, based on your email address, or another appropriate piece of information.

How can I authenticate myself using SASL? You can set up a SASL account for yourself and add it to the authorizedkeys file. If your system uses a command-line program, such as ssh, to authenticate you, you must first set up a password, so that it is used to encrypt your key in the authorizedkeys file. (This step is optional). For example:

Ssh-keygen -t rsa. Generates the public and private key pair. Note that the program will ask you to input a password.

Next, copy your public key and paste it to the clipboard. Then, from a terminal, execute the following command to create the public and private keys in ~/.ssh/idrsa.pub > ~/.ssh/authorizedkeys

Where the idrsa.

What does SASL mean?

SASL stands for Simple Authentication and Security Layer.

SASL is defined in RFC4422 and defines two kinds of protocols: The SASLprep protocol, which is just a subset of RFC 4178; and the extended SASL authentication protocol, used to establish an authenticated tunnel. The SASLprep protocol (RFC2616) simply prepends the email address of the user to the challenge-response string returned by the authenticator. It does this with special character sequences such as the @ symbol, which are excluded from the response to prevent cross-site scripting or other vulnerabilities.

The "pre-SASL" authentication mechanisms in OpenSSH, SSPI, and Kerberos are examples of the SASLprep protocol, and these use a pre-defined set of character sequences to prefix their responses. The first message exchanged between a client and an authenticator/server is usually a request-response protocol (like HTTP). During this exchange, an authenticator can tell a client what sort of authentication mechanism it supports. The authenticator then returns a challenge-response protocol (which is like an HTTP header) that allows a client to authenticate itself.

SASL includes a range of methods for implementing common authentication methods such as PAM and local password-based authentication, together with the following security mechanisms: Integrated authentication mechanisms rely on traditional network protocols. For example, NIS and PAM-based mechanisms operate as normal; OpenLDAP relies on the extended SASL mechanisms discussed later.

Authentication method: This is a particular authenticator and its corresponding method for authenticating the user. Realm: In the case of an integrated mechanism, the realm allows the method to make sense of other things that may be present in the credentials (for example, an NIS and/or RADIUS realm might define a host name to identify the end user). In many cases, the combination of these three components works well. For example, in an integrated realm of "NIS" with only the default realm, the NIS implementation is expected to check the username part of the credentials and then take a default value if the credentials don't specify anything about the user (this is not always 100% correct though).

The above means that the SASLprep mechanism actually changes slightly according to the SASL/PREP protocol that it uses.