Ssl Commands - D-Link xStack DES-3800 Series Cli Manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual

SSL Commands

Secure Sockets Layer or SSL is a security feature that will provide a secure communication path between
a host and client through the use of authentication, digital signatures and encryption. These security
functions are implemented through the use of a ciphersuite, which is a security string that determines the
exact cryptographic parameters, specific encryption algorithms and key sizes to be used for an
authentication session and consists of three levels:
Key Exchange: The first part of the cyphersuite string specifies the public key algorithm to be
1.
used. This Switch utilizes the Rivest Shamir Adleman (RSA) public key algorithm and the Digital
Signature Algorithm (DSA), specified here as the DHE_DSS Diffie-Hellman (DHE) public key
algorithm. This is the first authentication process between client and host as they "exchange keys"
in looking for a match and therefore authentication to be accepted to negotiate encryptions on the
following level.
Encryption: The second part of the ciphersuite that includes the encryption used for encrypting
2.
the messages sent between client and host. The Switch supports two types of cryptology
algorithms:
Stream Ciphers – There are two types of stream ciphers on the Switch, RC4 with 40-bit keys and RC4
with 128-bit keys. These keys are used to encrypt messages and need to be consistent between client and
host for optimal use.
CBC Block Ciphers – CBC refers to Cipher Block Chaining, which means that a portion of the previously
encrypted block of encrypted text is used in the encryption of the current block. The Switch supports the
3DES_EDE encryption code defined by the Data Encryption Standard (DES) to create the encrypted text.
Hash Algorithm: This part of the ciphersuite allows the user to choose a message digest function
3.
which will determine a Message Authentication Code. This Message Authentication Code will be
encrypted with a sent message to provide integrity and prevent against replay attacks. The Switch
supports two hash algorithms, MD5 (Message Digest 5) and SHA (Secure Hash Algorithm).
These three parameters are uniquely assembled in four choices on the Switch to create a three layered
encryption code for secure communication between the server and the host. The user may implement any
one or combination of the ciphersuites available, yet different ciphersuites will affect the security level
and the performance of the secured connection. The information included in the ciphersuites is not
included with the Switch and requires downloading from a third source in a file form called a certificate.
This function of the Switch cannot be executed without the presence and implementation of the certificate
file and can be downloaded to the Switch by utilizing a TFTP server. The Switch supports SSLv3 and
TLSv1. Other versions of SSL may not be compatible with this Switch and may cause problems upon
authentication and transfer of messages from client to host.
Command
enable ssl
disable ssl
config ssl cachetimeout timeout
Parameters
{ciphersuite {RSA_with_RC4_128_MD5 |
RSA_with_3DES_EDE_CBC_SHA |
DHE_DSS_with_3DES_EDE_CBC_SHA |
RSA_EXPORT_with_RC4_40_MD5}}
{ciphersuite {RSA_with_RC4_128_MD5 |
RSA_with_3DES_EDE_CBC_SHA |
DHE_DSS_with_3DES_EDE_CBC_SHA |
RSA_EXPORT_with_RC4_40_MD5}}
<value 60-86400>
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