03-05-2018
As Aia pointed the option you want is StrictHostKeyChecking=.
Use no or off to automatically add new host keys and allow connections to hosts with changed keys. Use accept-new to automatically add new hosts but not permit hosts with changed keys. ask (the default) to interactively ask the user what to do.
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LEARN ABOUT DEBIAN
libssh2_knownhost_check
libssh2_knownhost_check(3) libssh2 manual libssh2_knownhost_check(3)
NAME
libssh2_knownhost_check - check a host+key against the list of known hosts
SYNOPSIS
#include <libssh2.h>
int libssh2_knownhost_check(LIBSSH2_KNOWNHOSTS *hosts,
const char *host,
const char *key, size_t keylen,
int typemask,
struct libssh2_knownhost **knownhost);
DESCRIPTION
Checks a host and its associated key against the collection of known hosts, and returns info back about the (partially) matched entry.
host is a pointer the host name in plain text. The host name can be the IP numerical address of the host or the full name.
key is a pointer to the key for the given host.
keylen is the total size in bytes of the key pointed to by the key argument
typemask is a bitmask that specifies format and info about the data passed to this function. Specificly, it details what format the host
name is, what format the key is and what key type it is.
The host name is given as one of the following types: LIBSSH2_KNOWNHOST_TYPE_PLAIN or LIBSSH2_KNOWNHOST_TYPE_CUSTOM.
The key is encoded using one of the following encodings: LIBSSH2_KNOWNHOST_KEYENC_RAW or LIBSSH2_KNOWNHOST_KEYENC_BASE64.
knownhost if set to non-NULL, it must be a pointer to a 'struct libssh2_knownhost' pointer that gets filled in to point to info about a
known host that matches or partially matches.
RETURN VALUE
libssh2_knownhost_check(3) returns info about how well the provided host + key pair matched one of the entries in the list of known hosts.
LIBSSH2_KNOWNHOST_CHECK_FAILURE - something prevented the check to be made
LIBSSH2_KNOWNHOST_CHECK_NOTFOUND - no host match was found
LIBSSH2_KNOWNHOST_CHECK_MATCH - hosts and keys match.
LIBSSH2_KNOWNHOST_CHECK_MISMATCH - host was found, but the keys didn't match!
AVAILABILITY
Added in libssh2 1.2
EXAMPLE
See the ssh2_exec.c example as provided in the tarball.
SEE ALSO
libssh2_knownhost_init(3) libssh2_knownhost_free(3) libssh2_knownhost_add(3)
libssh2 1.2 28 May 2009 libssh2_knownhost_check(3)