08-18-2011
You can't login to ssh with an account set to nologin, no. That's kind of the point.
Actually now that I think of it you can install a utility called 'scponly', which is a special "shell" which will allow users to login for scp/sftp but won't permit them to login to a shell session. This would have the security advantages of nologin, but still let you check keys by logging in with scp.
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LEARN ABOUT CENTOS
libssh2_channel_direct_tcpip_ex
libssh2_channel_direct_tcpip_ex(3) libssh2 manual libssh2_channel_direct_tcpip_ex(3)
NAME
libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session
SYNOPSIS
#include <libssh2.h>
LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport);
LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port);
DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3)
host - Third party host to connect to using the SSH host as a proxy.
port - Port on third party host to connect to.
shost - Host to tell the SSH server the connection originated on.
sport - Port to tell the SSH server the connection originated from.
Tunnel a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server
remains encrypted, communication from the server to the 3rd party host travels in cleartext.
RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
SEE ALSO
libssh2_session_init_ex(3)
libssh2 0.15 1 Jun 2007 libssh2_channel_direct_tcpip_ex(3)