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// Copyright 2013-2015 Apcera Inc. All rights reserved.
package gssapi
/*
#include <stdlib.h>
#include <string.h>
#include <gssapi/gssapi.h>
const size_t gss_OID_size=sizeof(gss_OID_desc);
void helper_gss_OID_desc_free_elements(gss_OID oid) {
free(oid->elements);
}
void helper_gss_OID_desc_set_elements(gss_OID oid, OM_uint32 l, void *p) {
oid->length = l;
oid->elements = p;
}
void helper_gss_OID_desc_get_elements(gss_OID oid, OM_uint32 *l, char **p) {
*l = oid->length;
*p = oid->elements;
}
int
wrap_gss_oid_equal(void *fp, gss_OID oid1, gss_OID oid2)
{
return ((int(*) (gss_OID, gss_OID)) fp)(oid1, oid2);
}
*/
import "C"
import (
"bytes"
"fmt"
"unsafe"
)
// NewOID initializes a new OID. (Object Identifier)
func (lib *Lib) NewOID() *OID {
return &OID{Lib: lib}
}
// MakeOIDBytes makes an OID encapsulating a byte slice. Note that it does not
// duplicate the data, but rather it points to it directly.
func (lib *Lib) MakeOIDBytes(data []byte) (*OID, error) {
oid := lib.NewOID()
s := C.malloc(C.gss_OID_size) // s for struct
if s == nil {
return nil, ErrMallocFailed
}
C.memset(s, 0, C.gss_OID_size)
l := C.size_t(len(data))
e := C.malloc(l) // c for contents
if e == nil {
return nil, ErrMallocFailed
}
C.memmove(e, (unsafe.Pointer)(&data[0]), l)
oid.C_gss_OID = C.gss_OID(s)
oid.alloc = allocMalloc
// because of the alignment issues I can't access o.oid's fields from go,
// so invoking a C function to do the same as:
// oid.C_gss_OID.length = l
// oid.C_gss_OID.elements = c
C.helper_gss_OID_desc_set_elements(oid.C_gss_OID, C.OM_uint32(l), e)
return oid, nil
}
// MakeOIDString makes an OID from a string.
func (lib *Lib) MakeOIDString(data string) (*OID, error) {
return lib.MakeOIDBytes([]byte(data))
}
// Release safely frees the contents of an OID if it's allocated with malloc by
// MakeOIDBytes.
func (oid *OID) Release() error {
if oid == nil || oid.C_gss_OID == nil {
return nil
}
switch oid.alloc {
case allocMalloc:
// same as with get and set, use a C helper to free(oid.C_gss_OID.elements)
C.helper_gss_OID_desc_free_elements(oid.C_gss_OID)
C.free(unsafe.Pointer(oid.C_gss_OID))
oid.C_gss_OID = nil
oid.alloc = allocNone
}
return nil
}
// Bytes displays the bytes of an OID.
func (oid OID) Bytes() []byte {
var l C.OM_uint32
var p *C.char
C.helper_gss_OID_desc_get_elements(oid.C_gss_OID, &l, &p)
return C.GoBytes(unsafe.Pointer(p), C.int(l))
}
// String displays a string representation of an OID.
func (oid *OID) String() string {
var l C.OM_uint32
var p *C.char
C.helper_gss_OID_desc_get_elements(oid.C_gss_OID, &l, &p)
return fmt.Sprintf(`%x`, C.GoStringN(p, C.int(l)))
}
// Returns a symbolic name for a known OID, or the string. Note that this
// function is intended for debugging and is not at all performant.
func (oid *OID) DebugString() string {
switch {
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_USER_NAME.Bytes()):
return "GSS_C_NT_USER_NAME"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_MACHINE_UID_NAME.Bytes()):
return "GSS_C_NT_MACHINE_UID_NAME"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_STRING_UID_NAME.Bytes()):
return "GSS_C_NT_STRING_UID_NAME"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_HOSTBASED_SERVICE_X.Bytes()):
return "GSS_C_NT_HOSTBASED_SERVICE_X"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_HOSTBASED_SERVICE.Bytes()):
return "GSS_C_NT_HOSTBASED_SERVICE"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_ANONYMOUS.Bytes()):
return "GSS_C_NT_ANONYMOUS"
case bytes.Equal(oid.Bytes(), oid.GSS_C_NT_EXPORT_NAME.Bytes()):
return "GSS_C_NT_EXPORT_NAME"
case bytes.Equal(oid.Bytes(), oid.GSS_KRB5_NT_PRINCIPAL_NAME.Bytes()):
return "GSS_KRB5_NT_PRINCIPAL_NAME"
case bytes.Equal(oid.Bytes(), oid.GSS_KRB5_NT_PRINCIPAL.Bytes()):
return "GSS_KRB5_NT_PRINCIPAL"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_KRB5.Bytes()):
return "GSS_MECH_KRB5"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_KRB5_LEGACY.Bytes()):
return "GSS_MECH_KRB5_LEGACY"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_KRB5_OLD.Bytes()):
return "GSS_MECH_KRB5_OLD"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_SPNEGO.Bytes()):
return "GSS_MECH_SPNEGO"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_IAKERB.Bytes()):
return "GSS_MECH_IAKERB"
case bytes.Equal(oid.Bytes(), oid.GSS_MECH_NTLMSSP.Bytes()):
return "GSS_MECH_NTLMSSP"
}
return oid.String()
}
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