Example:

For the ASAv, the RSA key pairs are automatically created after deployment.

The modulus value (in bits) is 512, 768, 1024, 2048, 3072, or 4096. The larger the key modulus size you specify, the longer it takes to generate an RSA key pair. We recommend a value of at least 2048.

write memory

Example:

username name [password password] privilege level

Example:

By default, the privilege level is 2; enter a level between 0 and 15, where 15 has all privileges. You might want to create a user without a password if you want to force the user to use public key authentication (ssh authentication ) instead of password authentication. If you configure public key authentication as well as a password in the username command, then the user can log in with either method if you explicitly configure AAA authentication in this procedure. Note: Do not use the username command nopassword option; the nopassword option allows any password to be entered, not no password.

username nameattributes

ssh authentication {pkf publickey key}

Example:

For a local username , you can enable public key authentication instead of/as well as password authentication. You can generate a public key/private key pair using any SSH key generation software (such as ssh keygen) that can generate SSH-RSA raw keys (with no certificates). Enter the public key on the ASA. The SSH client then uses the private key (and the passphrase you used to create the key pair) to connect to the ASA.

For a pkf key, you are prompted to paste in a PKF formatted key, up to 4096 bits. Use this format for keys that are too large to paste inline in Base64 format. For example, you can generate a 4096-bit key using ssh keygen, then convert it to PKF, and use the pkf keyword to be prompted for the key. Note: You can use the pkf option with failover, but the PKF key is not automatically replicated to the standby system. You must enter the write standby command to synchronize the PKF key.

For a publickey key, the key is a Base64-encoded public key. You can generate the key using any SSH key generation software (such as ssh keygen) that can generate SSH-RSA raw keys (with no certificates).

aaa authentication ssh console {LOCAL server_group [LOCAL ]}

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Example:

This command does not affect local public key authentication for usernames with the ssh authentication command. The ASA implicitly uses the local database for public key authentication. This command only affects usernames with passwords. If you want to allow either public key authentication or password use by a local user, then you need to explicitly configure local authentication with this command to allow password access.

ssh source_IP_addressmask source_interface

• source_interface—Specify any named interface. For bridge groups, specify the bridge group member interface. For VPN management access only (see Configure Management Access Over a VPN Tunnel), specify the named BVI interface.

Unlike Telnet, you can SSH on the lowest security level interface.

Example:

ssh timeout minutes

Example:

Set the timeout from 1 to 60 minutes. The default is 5 minutes. The default duration is too short in most cases, and should be increased until all pre-production testing and troubleshooting have been completed.

ssh version version_number

Example:

ssh cipher encryption {all fips high low medium custom colon-delimited_list_of_encryption_ciphers}

Example:

The default is medium .

• The all keyword specifies using all ciphers: 3des-cbc aes128-cbc aes192-cbc aes256-cbc aes128-ctr aes192-ctr aes256-ctr

• The custom keyword specifies a custom cipher encryption configuration string, separated by colons.

• The fips keyword specifies only FIPS-compliant ciphers: aes128-cbc aes256-cbc

• The high keyword specifies only high-strength ciphers: aes256-cbc aes256-ctr

• The low keyword specifies low, medium, and high strength ciphers: 3des-cbc aes128-cbc aes192-cbc aes256-cbc aes128-ctr aes192-ctr aes256-ctr

• The medium keyword specifies the medium and high strength ciphers (the default): 3des-cbc aes128-cbc aes192-cbc aes256-cbc aes128-ctr aes192-ctr aes256-ctr

ssh cipher integrity {all fips high low medium custom colon-delimited_list_of_integrity_ciphers}

Example:

The default is medium .

• The all keyword specifies using all ciphers: hmac-sha1 hmac-sha1-96 hmac-md5 hmac-md5-96

• The custom keyword specifies a custom cipher encryption configuration string, separated by colons.

• The fips keyword specifies only FIPS-compliant ciphers: hmac-sha1

• The high keyword specifies only high-strength ciphers: hmac-sha1

• The low keyword specifies low, medium, and high strength ciphers: hmac-sha1 hmac-sha1-96 hmac-md5 hmac-md5-96

• The medium keyword specifies the medium and high strength ciphers (the default): hmac-sha1 hmac-sha1-96

ssh key-exchange group {dh-group1-sha1 dh-group14-sha1 }

Example:

The default is dh-group1-sha1

The DH key exchange provides a shared secret that cannot be determined by either party alone. The key exchange is combined with a signature and the host key to provide host authentication. This key-exchange method provides explicit server authentication. For more information about using DH key-exchange methods, see RFC 4253.