![]() Depending on the platform involved, the files are either In order to do this, you must modify the Windows registry by installing two files on each system. ![]() etc/passwd authentication for all clients, you can do so, but you must disable encrypted passwords on those Windows clients that default to using them. However, if you feel that your network is secure and you wish to use standard Unix Plaintext passwords are sent over the Internet and can be retrieved from TCP packets by malicious snoopers. Rlogin access across the Internet, it embodies well-known security risks. While Unix authentication has been in use for decades, including the use of Samba, however, will not accept any users until theĦ.4.1 Disabling encrypted passwords on the client Smb passwd file = /usr/local/samba/private/smbpasswd Note that we explicitly name the location of the Samba password file: You can configure Samba to accept encrypted passwords with the following global additions to Of course, you should also ensure that the clients safeguard their plaintext-equivalent passwords as well. Plaintext-equivalent data in the cryptography world. The encrypted passwords are just as sensitive as the plaintext passwords - this is known as If they are compromised, an unauthorized user can break into the system by replaying the steps of the previous algorithm. Smbpasswd file are guarded from unauthorized users. Note that even though the original passwords are not involved in the authentication process, you need to be very careful that the encrypted passwords located inside of the If the results match, the passwords are equivalent and the user is authenticated. The server does the same thing with the encrypted password stored in its database. The client uses the challenge string as a key to encrypt its already encrypted password using an algorithm predefined by the negotiated protocol. At this time, it sends back a randomly-generated 8-byte challenge string. The server responds with a protocol and indicates that it supports encrypted passwords. The client attempts to negotiate a protocol with the server. When a client requests a connection to an SMB server that supports encrypted passwords (such as Samba or Windows NT), the two computers undergo the following negotiations: Each system encrypts the password automatically using a known algorithm when the password is set or changed. The plaintext password is never stored on either system. At the same time, the client stores an encrypted version of a user's password on its own system. Private directory of the Samba distribution ( If encrypted passwords are supported, Samba stores the encrypted passwords in a file called Windows 95 and 98 use an older encryption system inherited from the LAN Manager network software, while Windows NT clients and servers use a newer encryption system. ![]() There are actually two different encryption methods used: one for Windows 95 and 98 clients that reuses Microsoft's LAN Manager encryption style, and a separate one for Windows NT clients and servers. Table 6.5: Windows Operating Systems with Encrypted Passwords If your client is not Windows, check the system documentation to see if SMB passwords are encrypted. Table 6.5 lists which Windows operating systems encrypt their passwords before sending them to the primary domain controller for authentication. Whether passwords are encrypted depends on the operating system that the client is using to connect to the Samba server. Tcpdump program for Samba that we used in Chapter 3,Ĭonfiguring Windows Clients. A non-encrypted password can be easily read with a packet sniffing program, such as the modified Encrypted passwords are, of course, more secure. Passwords sent from individual clients can be either encrypted or non-encrypted. However, at this point, we need to delve deeper into Samba to discover what is happening on the network. Ok option in each of our configuration files, which allows connections without authenticating passwords. In previous chapters, we've gotten around the need for passwords by placing the So much so, in fact, that they are almost always the first major problem that users encounter when they install Samba, and generate by far the most questions sent to Samba support groups.
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