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      1 /*	$NetBSD: encapsulate.c,v 1.2 2017/01/28 21:31:46 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 - 2003 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include "gsskrb5_locl.h"
     37 
     38 void
     39 _gssapi_encap_length (size_t data_len,
     40 		      size_t *len,
     41 		      size_t *total_len,
     42 		      const gss_OID mech)
     43 {
     44     size_t len_len;
     45 
     46     *len = 1 + 1 + mech->length + data_len;
     47 
     48     len_len = der_length_len(*len);
     49 
     50     *total_len = 1 + len_len + *len;
     51 }
     52 
     53 void
     54 _gsskrb5_encap_length (size_t data_len,
     55 			  size_t *len,
     56 			  size_t *total_len,
     57 			  const gss_OID mech)
     58 {
     59     _gssapi_encap_length(data_len + 2, len, total_len, mech);
     60 }
     61 
     62 void *
     63 _gsskrb5_make_header (void *ptr,
     64 			 size_t len,
     65 			 const void *type,
     66 			 const gss_OID mech)
     67 {
     68     u_char *p = ptr;
     69     p = _gssapi_make_mech_header(p, len, mech);
     70     memcpy (p, type, 2);
     71     p += 2;
     72     return p;
     73 }
     74 
     75 void *
     76 _gssapi_make_mech_header(void *ptr,
     77 			 size_t len,
     78 			 const gss_OID mech)
     79 {
     80     u_char *p = ptr;
     81     int e;
     82     size_t len_len, foo;
     83 
     84     *p++ = 0x60;
     85     len_len = der_length_len(len);
     86     e = der_put_length (p + len_len - 1, len_len, len, &foo);
     87     if(e || foo != len_len)
     88 	abort ();
     89     p += len_len;
     90     *p++ = 0x06;
     91     *p++ = mech->length;
     92     memcpy (p, mech->elements, mech->length);
     93     p += mech->length;
     94     return p;
     95 }
     96 
     97 /*
     98  * Give it a krb5_data and it will encapsulate with extra GSS-API wrappings.
     99  */
    100 
    101 OM_uint32
    102 _gssapi_encapsulate(
    103     OM_uint32 *minor_status,
    104     const krb5_data *in_data,
    105     gss_buffer_t output_token,
    106     const gss_OID mech
    107 )
    108 {
    109     size_t len, outer_len;
    110     void *p;
    111 
    112     _gssapi_encap_length (in_data->length, &len, &outer_len, mech);
    113 
    114     output_token->length = outer_len;
    115     output_token->value  = malloc (outer_len);
    116     if (output_token->value == NULL) {
    117 	*minor_status = ENOMEM;
    118 	return GSS_S_FAILURE;
    119     }
    120 
    121     p = _gssapi_make_mech_header (output_token->value, len, mech);
    122     memcpy (p, in_data->data, in_data->length);
    123     return GSS_S_COMPLETE;
    124 }
    125 
    126 /*
    127  * Give it a krb5_data and it will encapsulate with extra GSS-API krb5
    128  * wrappings.
    129  */
    130 
    131 OM_uint32
    132 _gsskrb5_encapsulate(
    133 			OM_uint32 *minor_status,
    134 			const krb5_data *in_data,
    135 			gss_buffer_t output_token,
    136 			const void *type,
    137 			const gss_OID mech
    138 )
    139 {
    140     size_t len, outer_len;
    141     u_char *p;
    142 
    143     _gsskrb5_encap_length (in_data->length, &len, &outer_len, mech);
    144 
    145     output_token->length = outer_len;
    146     output_token->value  = malloc (outer_len);
    147     if (output_token->value == NULL) {
    148 	*minor_status = ENOMEM;
    149 	return GSS_S_FAILURE;
    150     }
    151 
    152     p = _gsskrb5_make_header (output_token->value, len, type, mech);
    153     memcpy (p, in_data->data, in_data->length);
    154     return GSS_S_COMPLETE;
    155 }
    156