lib/gssapi/krb5/import_name.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 static OM_uint32
  37 parse_krb5_name (OM_uint32 *minor_status,
  38                  krb5_context context,
  39                  const char *name,
  40                  gss_name_t *output_name)
  41 {
  42     krb5_principal princ;
  43     krb5_error_code kerr;
  44
  45     kerr = krb5_parse_name (context, name, &princ);
  46
  47     if (kerr == 0) {
  48         *output_name = (gss_name_t)princ;
  49         return GSS_S_COMPLETE;
  50     }
  51     *minor_status = kerr;
  52
  53     if (kerr == KRB5_PARSE_ILLCHAR || kerr == KRB5_PARSE_MALFORMED)
  54         return GSS_S_BAD_NAME;
  55
  56     return GSS_S_FAILURE;
  57 }
  58
  59 static OM_uint32
  60 import_krb5_name (OM_uint32 *minor_status,
  61                   krb5_context context,
  62                   const gss_buffer_t input_name_buffer,
  63                   gss_name_t *output_name)
  64 {
  65     OM_uint32 ret;
  66     char *tmp;
  67
  68     tmp = malloc (input_name_buffer->length + 1);
  69     if (tmp == NULL) {
  70         *minor_status = ENOMEM;
  71         return GSS_S_FAILURE;
  72     }
  73     memcpy (tmp,
  74             input_name_buffer->value,
  75             input_name_buffer->length);
  76     tmp[input_name_buffer->length] = '\0';
  77
  78     ret = parse_krb5_name(minor_status, context, tmp, output_name);
  79     free(tmp);
  80
  81     return ret;
  82 }
  83
  84 OM_uint32
  85 _gsskrb5_canon_name(OM_uint32 *minor_status, krb5_context context,
  86                     int use_dns, krb5_const_principal sourcename,
  87                     gss_const_name_t targetname, krb5_principal *out)
  88 {
  89     krb5_const_principal p = (krb5_const_principal)targetname;
  90     krb5_error_code ret;
  91     char *hostname = NULL, *service;
  92
  93     *minor_status = 0;
  94
  95     /* If its not a hostname */
  96     if (krb5_principal_get_type(context, p) != MAGIC_HOSTBASED_NAME_TYPE) {
  97         ret = krb5_copy_principal(context, p, out);
  98     } else if (!use_dns) {
  99         ret = krb5_copy_principal(context, p, out);
 100         if (ret)
 101             goto out;
 102         krb5_principal_set_type(context, *out, KRB5_NT_SRV_HST);
 103         if (sourcename)
 104             ret = krb5_principal_set_realm(context, *out, sourcename->realm);
 105     } else {
 106         if (p->name.name_string.len == 0)
 107             return GSS_S_BAD_NAME;
 108         else if (p->name.name_string.len > 1)
 109             hostname = p->name.name_string.val[1];
 110
 111         service = p->name.name_string.val[0];
 112
 113         ret = krb5_sname_to_principal(context,
 114                                       hostname,
 115                                       service,
 116                                       KRB5_NT_SRV_HST,
 117                                       out);
 118     }
 119
 120  out:
 121     if (ret) {
 122         *minor_status = ret;
 123         return GSS_S_FAILURE;
 124     }
 125
 126     return 0;
 127 }
 128
 129
 130 static OM_uint32
 131 import_hostbased_name (OM_uint32 *minor_status,
 132                        krb5_context context,
 133                        const gss_buffer_t input_name_buffer,
 134                        gss_name_t *output_name)
 135 {
 136     krb5_principal princ = NULL;
 137     krb5_error_code kerr;
 138     char *tmp, *p, *host = NULL;
 139
 140     tmp = malloc (input_name_buffer->length + 1);
 141     if (tmp == NULL) {
 142         *minor_status = ENOMEM;
 143         return GSS_S_FAILURE;
 144     }
 145     memcpy (tmp,
 146             input_name_buffer->value,
 147             input_name_buffer->length);
 148     tmp[input_name_buffer->length] = '\0';
 149
 150     p = strchr (tmp, '@');
 151     if (p != NULL) {
 152         *p = '\0';
 153         host = p + 1;
 154     }
 155
 156     kerr = krb5_make_principal(context, &princ, NULL, tmp, host, NULL);
 157     free (tmp);
 158     *minor_status = kerr;
 159     if (kerr == KRB5_PARSE_ILLCHAR || kerr == KRB5_PARSE_MALFORMED)
 160         return GSS_S_BAD_NAME;
 161     else if (kerr)
 162         return GSS_S_FAILURE;
 163
 164     krb5_principal_set_type(context, princ, MAGIC_HOSTBASED_NAME_TYPE);
 165     *output_name = (gss_name_t)princ;
 166
 167     return 0;
 168 }
 169
 170 static OM_uint32
 171 import_export_name (OM_uint32 *minor_status,
 172                     krb5_context context,
 173                     const gss_buffer_t input_name_buffer,
 174                     gss_name_t *output_name)
 175 {
 176     unsigned char *p;
 177     uint32_t length;
 178     OM_uint32 ret;
 179     char *name;
 180
 181     if (input_name_buffer->length < 10 + GSS_KRB5_MECHANISM->length)
 182         return GSS_S_BAD_NAME;
 183
 184     /* TOK, MECH_OID_LEN, DER(MECH_OID), NAME_LEN, NAME */
 185
 186     p = input_name_buffer->value;
 187
 188     if (memcmp(&p[0], "\x04\x01\x00", 3) != 0 ||
 189         p[3] != GSS_KRB5_MECHANISM->length + 2 ||
 190         p[4] != 0x06 ||
 191         p[5] != GSS_KRB5_MECHANISM->length ||
 192         memcmp(&p[6], GSS_KRB5_MECHANISM->elements,
 193                GSS_KRB5_MECHANISM->length) != 0)
 194         return GSS_S_BAD_NAME;
 195
 196     p += 6 + GSS_KRB5_MECHANISM->length;
 197
 198     length = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
 199     p += 4;
 200
 201     if (length > input_name_buffer->length - 10 - GSS_KRB5_MECHANISM->length)
 202         return GSS_S_BAD_NAME;
 203
 204     name = malloc(length + 1);
 205     if (name == NULL) {
 206         *minor_status = ENOMEM;
 207         return GSS_S_FAILURE;
 208     }
 209     memcpy(name, p, length);
 210     name[length] = '\0';
 211
 212     ret = parse_krb5_name(minor_status, context, name, output_name);
 213     free(name);
 214
 215     return ret;
 216 }
 217
 218 OM_uint32 GSSAPI_CALLCONV _gsskrb5_import_name
 219            (OM_uint32 * minor_status,
 220             const gss_buffer_t input_name_buffer,
 221             const gss_OID input_name_type,
 222             gss_name_t * output_name
 223            )
 224 {
 225     krb5_context context;
 226
 227     *minor_status = 0;
 228     *output_name = GSS_C_NO_NAME;
 229
 230     GSSAPI_KRB5_INIT (&context);
 231
 232     if (gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE) ||
 233         gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE_X))
 234         return import_hostbased_name (minor_status,
 235                                       context,
 236                                       input_name_buffer,
 237                                       output_name);
 238     else if (input_name_type == GSS_C_NO_OID
 239              || gss_oid_equal(input_name_type, GSS_C_NT_USER_NAME)
 240              || gss_oid_equal(input_name_type, GSS_KRB5_NT_PRINCIPAL_NAME))
 241         /* default printable syntax */
 242         return import_krb5_name (minor_status,
 243                                  context,
 244                                  input_name_buffer,
 245                                  output_name);
 246     else if (gss_oid_equal(input_name_type, GSS_C_NT_EXPORT_NAME)) {
 247         return import_export_name(minor_status,
 248                                   context,
 249                                   input_name_buffer,
 250                                   output_name);
 251     } else {
 252         *minor_status = 0;
 253         return GSS_S_BAD_NAMETYPE;
 254     }
 255 }