What Is Password Authentication Protocol

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Password Authentication Protocol (PAP) – PAP is a password authentication protocol used by PPP links to validate users. PAP authentication requires the calling device to enter the username and password. If the credentials match the local database of the called device or the remote AAA database, access can be granted to another access denied. PAP is considered a weak authentication scheme (weak schemes are simple and have less compute costs, but are much more vulnerable to attack; although weak schemes can only be applied to a limited extent in some restricted environments, they are generally avoided). One of the shortcomings of the PAP is the fact that it transmits unencrypted passwords (i.e. in plain text) over the network. Therefore, PAP is only used as a last resort if the remote server does not support a stronger schema such as CHAP or EAP. If all the systems you are talking to PPP agree to authenticate with you, you must include the authentication option in the global /etc/ppp/options file and set passwords for each system in the chap secret file. If a system does not support CHAP, add an entry to the pap-secrets file. This allows you to ensure that no unauthenticated systems connect to your host. If the credentials are sent correctly, the server sends an authentication confirmation response packet to the client.

The server then configures the PPP session between the client and the server. PAP allows a remote host to easily establish its identity using a two-way handshake. This only happens during the first connection. The host name of one router must match the user name configured by the other router. Passwords do not have to match. Note – This command can also be used on the router that wants to authenticate in the case of one-way authentication (calling router), that is, only the calling router authenticates. If two-way authentication, that is, the client and the remote device authenticate each other, we need to create a local database and use this command on both devices. First, we create a local database on R1 by providing a username and password: CHAP takes a more sophisticated and secure approach to authentication. It creates a unique challenge phrase for each authentication by generating a random string. This challenge phrase is combined with device hostnames that use unidirectional hashing capabilities.

This process allows CHAP to authenticate so that static secret information is not sent over the line. This behavior can be changed in several ways. For example, if the auth keyword is specified, pppd requires the peer to authenticate. pppd will agree to use CHAP or PAP for this as long as it has a secret for the peer in its CHAP or PAP database. There are other options to enable or disable a particular authentication protocol, but I won`t describe them here. For more information, see the pppd(8) man page. Although PAP cannot be called a very strong authentication protocol, there are times when the use of PAP may be justified. PAP can be used in the following situations: With PPP, any system can require its counterpart to authenticate using one of two authentication protocols. These are the Password Authentication Protocol (PAP) and the Challenge Handshake Authentication Protocol (CHAP).

When a connection is established, each end can prompt the other to authenticate, whether it is the caller or the caller. In the following, I will vaguely refer to «client» and «server» if I want to distinguish between the authentication system and the authenticator. A PPP daemon can request authentication from its counterpart by sending another LCP configuration request that identifies the desired authentication protocol. PAP uses a two-way negotiation process for authentication by following these steps. The NETWORK Access server performs a hostname lookup on the client and initiates CHAP authentication by sending a request challenge to the remote user. This challenge contains a randomly generated challenge string. Note here that the username and password are case sensitive. In addition, we must provide a username and password on the R1 router.

PAP is typically used only when the Remote Access server and the remote client cannot negotiate a higher form of authentication. The remote client initiates the PAP session when it tries to connect to the PPP server or router. PAP identifies only the client on the PPP server; The server then authenticates the client based on the authentication scheme and user database implemented on the server. CHAP uses a three-way negotiation process to protect the authentication password from malicious actors. It works as follows. HQ(config-if)#ppp pap sent-username HQ password orbit Among these two authentication protocols, PAP is less secure because the password is sent in plain text and is only executed the first time the connection is established. The following two sections cover the two PPP secret files, pap-secrets and chap-secrets. They are located in /etc/ppp and contain triplets of clients, servers, and passwords, possibly followed by a list of IP addresses. .

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