text: /*-
   * Copyright (c) 2005 Doug Rabson
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	$FreeBSD: src/lib/libgssapi/gss_import_name.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
   */
  
  #include "mech_locl.h"
  
  static OM_uint32
  _gss_import_export_name(OM_uint32 *minor_status,
      const gss_buffer_t input_name_buffer,
      gss_name_t *output_name)
  {
  	OM_uint32 major_status;
  	unsigned char *p = input_name_buffer->value;
  	size_t len = input_name_buffer->length;
  	size_t t;
  	gss_OID_desc mech_oid;
  	gssapi_mech_interface m;
  	struct _gss_name *name;
  	gss_name_t new_canonical_name;
  	int composite = 0;
  
  	*minor_status = 0;
  	*output_name = 0;
  
  	/*
  	 * Make sure that TOK_ID is {4, 1}.
  	 */
  	if (len < 2)
  		return (GSS_S_BAD_NAME);
  	if (p[0] != 4)
  		return (GSS_S_BAD_NAME);
  	switch (p[1]) {
  	case 1:	/* non-composite name */
  		break;
  	case 2:	/* composite name */
  		composite = 1;
  		break;
  	default:
  		return (GSS_S_BAD_NAME);
  	}
  	p += 2;
  	len -= 2;
  
  	/*
  	 * Get the mech length and the name length and sanity
  	 * check the size of of the buffer.
  	 */
  	if (len < 2)
  		return (GSS_S_BAD_NAME);
  	t = (p[0] << 8) + p[1];
  	p += 2;
  	len -= 2;
  
  	/*
  	 * Check the DER encoded OID to make sure it agrees with the
  	 * length we just decoded.
  	 */
  	if (p[0] != 6)		/* 6=OID */
  		return (GSS_S_BAD_NAME);
  	p++;
  	len--;
  	t--;
  	if (p[0] & 0x80) {
  		int digits = p[0];
  		p++;
  		len--;
  		t--;
  		mech_oid.length = 0;
  		while (digits--) {
  			mech_oid.length = (mech_oid.length << 8) | p[0];
  			p++;
  			len--;
  			t--;
  		}
  	} else {
  		mech_oid.length = p[0];
  		p++;
  		len--;
  		t--;
  	}
  	if (mech_oid.length != t)
  		return (GSS_S_BAD_NAME);
  
  	mech_oid.elements = p;
  
  	if (len < t + 4)
  		return (GSS_S_BAD_NAME);
  	p += t;
  	len -= t;
  
  	t = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
  	p += 4;
  	len -= 4;
  
  	if (!composite && len != t)
  		return (GSS_S_BAD_NAME);
  
  	m = __gss_get_mechanism(&mech_oid);
  	if (!m)
  		return (GSS_S_BAD_MECH);
  
  	/*
  	 * Ask the mechanism to import the name.
  	 */
  	major_status = m->gm_import_name(minor_status,
  	    input_name_buffer, GSS_C_NT_EXPORT_NAME, &new_canonical_name);
  	if (major_status != GSS_S_COMPLETE) {
  		_gss_mg_error(m, major_status, *minor_status);
  		return major_status;
  	}
  
  	/*
  	 * Now we make a new name and mark it as an MN.
  	 */
  	name = _gss_make_name(m, new_canonical_name);
  	if (!name) {
  		m->gm_release_name(minor_status, &new_canonical_name);
  		return (GSS_S_FAILURE);
  	}
  
  	*output_name = (gss_name_t) name;
  
  	*minor_status = 0;
  	return (GSS_S_COMPLETE);
  }
  
  /**
   * Import a name internal or mechanism name
   *
   * Type of name and their format:
   * - GSS_C_NO_OID
   * - GSS_C_NT_USER_NAME
   * - GSS_C_NT_HOSTBASED_SERVICE
   * - GSS_C_NT_EXPORT_NAME
   * - GSS_C_NT_ANONYMOUS
   * - GSS_KRB5_NT_PRINCIPAL_NAME
   *
   * For more information about @ref internalVSmechname.
   *
   * @param minor_status minor status code
   * @param input_name_buffer import name buffer
   * @param input_name_type type of the import name buffer
   * @param output_name the resulting type, release with
   *        gss_release_name(), independent of input_name
   *
   * @returns a gss_error code, see gss_display_status() about printing
   *        the error code.
   *
   * @ingroup gssapi
   */
  
  GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
  gss_import_name(OM_uint32 *minor_status,
      const gss_buffer_t input_name_buffer,
      const gss_OID input_name_type,
      gss_name_t *output_name)
  {
          struct _gss_mechanism_name *mn;
  	gss_OID			name_type = input_name_type;
  	OM_uint32		major_status, ms;
  	struct _gss_name	*name;
          struct _gss_mech_switch	*m;
  	gss_name_t		rname;
  
  	*output_name = GSS_C_NO_NAME;
  
  	if (input_name_buffer->length == 0) {
  		*minor_status = 0;
  		return (GSS_S_BAD_NAME);
  	}
  
  	_gss_load_mech();
  
  	/*
  	 * Use GSS_NT_USER_NAME as default name type.
  	 */
  	if (name_type == GSS_C_NO_OID)
  		name_type = GSS_C_NT_USER_NAME;
  
  	/*
  	 * If this is an exported name, we need to parse it to find
  	 * the mechanism and then import it as an MN. See RFC 2743
  	 * section 3.2 for a description of the format.
  	 */
  	if (gss_oid_equal(name_type, GSS_C_NT_EXPORT_NAME)) {
  		return _gss_import_export_name(minor_status,
  		    input_name_buffer, output_name);
  	}
  
  
  	*minor_status = 0;
  	name = calloc(1, sizeof(struct _gss_name));
  	if (!name) {
  		*minor_status = ENOMEM;
  		return (GSS_S_FAILURE);
  	}
  
  	HEIM_SLIST_INIT(&name->gn_mn);
  
  	major_status = _gss_copy_oid(minor_status,
  	    name_type, &name->gn_type);
  	if (major_status) {
  		free(name);
  		return (GSS_S_FAILURE);
  	}
  
  	major_status = _gss_copy_buffer(minor_status,
  	    input_name_buffer, &name->gn_value);
  	if (major_status)
  		goto out;
  
  	/*
  	 * Walk over the mechs and import the name into a mech name
  	 * for those supported this nametype.
  	 */
  
  	HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
  		int present = 0;
  
  		major_status = gss_test_oid_set_member(minor_status,
  		    name_type, m->gm_name_types, &present);
  
  		if (major_status || present == 0)
  			continue;
  
  		mn = malloc(sizeof(struct _gss_mechanism_name));
  		if (!mn) {
  			*minor_status = ENOMEM;
  			major_status = GSS_S_FAILURE;
  			goto out;
  		}
  
  		major_status = (*m->gm_mech.gm_import_name)(minor_status,
  		    &name->gn_value,
  		    (name->gn_type.elements
  			? &name->gn_type : GSS_C_NO_OID),
  		    &mn->gmn_name);
  		if (major_status != GSS_S_COMPLETE) {
  			_gss_mg_error(&m->gm_mech, major_status, *minor_status);
  			free(mn);
  			goto out;
  		}
  
  		mn->gmn_mech = &m->gm_mech;
  		mn->gmn_mech_oid = &m->gm_mech_oid;
  		HEIM_SLIST_INSERT_HEAD(&name->gn_mn, mn, gmn_link);
  	}
  
  	/*
  	 * If we can't find a mn for the name, bail out already here.
  	 */
  
  	mn = HEIM_SLIST_FIRST(&name->gn_mn);
  	if (!mn) {
  		*minor_status = 0;
  		major_status = GSS_S_NAME_NOT_MN;
  		goto out;
  	}
  
  	*output_name = (gss_name_t) name;
  	return (GSS_S_COMPLETE);
  
   out:
  	rname = (gss_name_t)name;
  	gss_release_name(&ms, &rname);
  	return major_status;
  }
  