03-21-2013
Maybe setting up sshd_config with a Match block and a ForceCommand for the users you don't want to have SFTP access would prevent spawning the SFTP subsystem?
I'd also test it against SCP attempts.
Worst case, you could try running two SSHD daemons, on different interfaces. Set up one for your clients to ONLY run what you want - set the SFTP subsystem to /dev/null, for example. Set up the other SSHD daemon for everyone else. Then use the Match blocks in the two sshd_config files to control access, probably based on group membership.
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LEARN ABOUT CENTOS
libssh2_sftp_init
libssh2_sftp_init(3) libssh2 manual libssh2_sftp_init(3)
NAME
libssh2_sftp_init - open SFTP channel for the given SSH session.
SYNOPSIS
#include <libssh2.h> #include <libssh2_sftp.h>
LIBSSH2_SFTP * libssh2_sftp_init(LIBSSH2_SESSION *session);
DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3)
Open a channel and initialize the SFTP subsystem. Although the SFTP subsystem operates over the same type of channel as those exported by
the Channel API, the protocol itself implements its own unique binary packet protocol which must be managed with the libssh2_sftp_*() fam-
ily of functions. When an SFTP session is complete, it must be destroyed using the libssh2_sftp_shutdown(3) function.
RETURN VALUE
A pointer to the newly allocated SFTP instance or NULL on failure.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_SOCKET_TIMEOUT -
LIBSSH2_ERROR_SFTP_PROTOCOL - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to be
returned by the server.
LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block.
SEE ALSO
libssh2_sftp_shutdown(3) libssh2_sftp_open_ex(3)
libssh2 0.15 1 Jun 2007 libssh2_sftp_init(3)