xStack
®
DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
616
81
SECURE SOCKETS LAYER (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 ciphersuite string specifies the public key algorithm to be 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 the messages
sent between client and host. The Switch supports two types of cryptology algorithms:
o
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.
o
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 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
Parameters
enable ssl
{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}}
disable ssl
{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}}
config ssl cachetimeout
<value 60-86400>
show ssl
{certificate}
show ssl cachetimeout
download ssl certificate
<ipaddr> certfilename <path_filename 64> keyfilename <path_filename 64>
Each command is listed, in detail, in the following sections.
19216811.live