CURLOPT_SSH_AUTH_TYPES (3) - Linux Man Pages
CURLOPT_SSH_AUTH_TYPES: set desired auth types for SFTP and SCP
NAMECURLOPT_SSH_AUTH_TYPES - set desired auth types for SFTP and SCP
DESCRIPTIONPass a long set to a bitmask consisting of one or more of CURLSSH_AUTH_PUBLICKEY, CURLSSH_AUTH_PASSWORD, CURLSSH_AUTH_HOST, CURLSSH_AUTH_KEYBOARD and CURLSSH_AUTH_AGENT.
Set CURLSSH_AUTH_ANY to let libcurl pick a suitable one. Currently CURLSSH_AUTH_HOST has no effect. If CURLSSH_AUTH_AGENT is used, libcurl attempts to connect to ssh-agent or pageant and let the agent attempt the authentication.