Solaris Secure Shell Authentication
Solaris Secure Shell provides public key and password methods for authenticating the connection to the remote host. Public key authentication is a stronger authentication mechanism than password authentication, because the private key never travels over the network.
The authentication methods are tried in the following order. When the configuration does not satisfy an authentication method, the next method is tried.
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GSS-API – Uses credentials for GSS-API mechanisms such as mech_krb5 (Kerberos V) and mech_dh (AUTH_DH) to authenticate clients and servers. For more information on GSS-API, see Introduction to GSS-API in Solaris Security for Developers Guide.
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Host-based authentication – Uses host keys and rhosts files. Uses the client's RSA and DSA public/private host keys to authenticate the client. Uses the rhosts files to authorize clients to users.
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Public key authentication – Authenticates users with their RSA and DSA public/private keys.
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Password authentication – Uses PAM to authenticate users. Keyboard authentication method in v2 allows for arbitrary prompting by PAM. For more information, see the SECURITY section in the sshd(1M) man page.
The following table shows the requirements for authenticating a user who is trying to log into a remote host. The user is on the local host, the client. The remote host, the server, is running the sshd daemon. The table shows the Solaris Secure Shell authentication methods, the compatible protocol versions, and the host requirements.
Table 19–1 Authentication Methods for Solaris Secure Shell|
Authentication Method (Protocol Version) |
Local Host (Client) Requirements |
Remote Host (Server) Requirements |
|---|---|---|
|
Initiator credentials for the GSS mechanism. |
Acceptor credentials for the GSS mechanism. For more information, see Acquiring GSS Credentials in Solaris Secure Shell. |
|
|
User account Local host private key in /etc/ssh/ssh_host_rsa_key or /etc/ssh/ssh_host_dsa_key HostbasedAuthentication yes in /etc/ssh/ssh_config |
User account Local host public key in /etc/ssh/known_hosts or ~/.ssh/known_hosts HostbasedAuthentication yes in /etc/ssh/sshd_config IgnoreRhosts no in /etc/ssh/sshd_config Local host entry in /etc/ssh/shosts.equiv, /etc/hosts.equiv, ~/.rhosts, or ~/.shosts |
|
|
User account Private key in ~/.ssh/id_rsa or ~/.ssh/id_dsa User's public key in ~/.ssh/id_rsa.pub or ~/.ssh/id_dsa.pub |
User account User's public key in ~/.ssh/authorized_keys |
|
|
RSA public key (v1) |
User account Private key in ~/.ssh/identity User's public key in ~/.ssh/identity.pub |
User account User's public key in ~/.ssh/authorized_keys |
|
User account |
User account Supports PAM, including arbitrary prompting and password changing when password aging is triggered. |
|
|
User account |
User account Supports PAM. |
|
|
.rhosts only (v1) |
User account |
User account IgnoreRhosts no in /etc/ssh/sshd_config Local host entry in /etc/ssh/shosts.equiv, /etc/hosts.equiv, ~/.shosts, or ~/.rhosts |
|
.rhosts with RSA (v1) on server only |
User account Local host public key in /etc/ssh/ssh_host_rsa1_key |
User account Local host public key in /etc/ssh/ssh_known_hosts or ~/.ssh/known_hosts IgnoreRhosts no in /etc/ssh/sshd_config Local host entry in /etc/ssh/shosts.equiv, /etc/hosts.equiv, ~/.shosts, or ~/.rhosts |
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