lib/gssapi/krb5/encapsulate.c

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