UTIL: Create new wraper header file sss_endian.h Some platform have header file endian.h and anothers have sys/endian.h. We nedd to use conditional build to handle it correctly, therefore new header file sss_endian.h was created.

Fix potential out-of-bounds write in sss_idmap_sid_to_dom_sid https://fedorahosted.org/sssd/ticket/1861

sss_idmap: fix typo which prevents sub auth larger then 2^31 A test to cover this is added as well.

sss_idmap: add support for samba struct dom_sid The samba ndr libraries use struct dom_sid to handle SIDs. Since there is no public samba library which offers conversion from other representations, e.g. as string, this is added to libsss_idmap. To avoid compile-time or run-time dependency to any samba library or header file the definition of the struct is copied here.

Rename struct dom_sid to struct sss_dom_sid To avoid conflicts with struct dom_sid used by samba the sss_ prefix is added to the struct used by libsss_idmap.

Fix endian issue in SID conversion Since the byte-order is only important when dealing with the binary SID the sub-auth values are stored in host order and are only converted while reading or writing the binary SID.

Allow different SID representations in libidmap Besides as strings it is now possible to use binary SIDs or a struct containing all SID information. Functions to convert between these formats are added as well.