source4/heimdal/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                     gss_const_name_t targetname, krb5_principal *out)
  87 {
  88     krb5_const_principal p = (krb5_const_principal)targetname;
  89     krb5_error_code ret;
  90     char *hostname = NULL, *service;
  91     int type;
  92     const char *comp;
  93
  94     *minor_status = 0;
  95
  96     /* If its not a hostname */
  97     type = krb5_principal_get_type(context, p);
  98     comp = krb5_principal_get_comp_string(context, p, 0);
  99     if (type == KRB5_NT_SRV_HST || type == KRB5_NT_SRV_HST_NEEDS_CANON ||
 100         (type == KRB5_NT_UNKNOWN && comp != NULL && strcmp(comp, "host") == 0)) {
 101         if (p->name.name_string.len == 0)
 102             return GSS_S_BAD_NAME;
 103         else if (p->name.name_string.len > 1)
 104             hostname = p->name.name_string.val[1];
 105
 106         service = p->name.name_string.val[0];
 107
 108         ret = krb5_sname_to_principal(context,
 109                                       hostname,
 110                                       service,
 111                                       KRB5_NT_SRV_HST,
 112                                       out);
 113         if (ret == 0) {
 114             const char *in_realm = krb5_principal_get_realm(context,
 115                                                             p);
 116             const char *out_realm = krb5_principal_get_realm(context,
 117                                                              *out);
 118
 119             /*
 120              * Avoid loss of information, check for the "referral
 121              * realm" and set back what was specified.
 122              */
 123             if (out_realm != NULL && out_realm[0] == '\0') {
 124                 ret = krb5_principal_set_realm(context, *out, in_realm);
 125             }
 126         }
 127     } else {
 128         ret = krb5_copy_principal(context, p, out);
 129     }
 130
 131     if (ret) {
 132         *minor_status = ret;
 133         return GSS_S_FAILURE;
 134     }
 135
 136     return 0;
 137 }
 138
 139
 140 static OM_uint32
 141 import_hostbased_name(OM_uint32 *minor_status,
 142                       krb5_context context,
 143                       const gss_buffer_t input_name_buffer,
 144                       gss_name_t *output_name)
 145 {
 146     krb5_principal princ = NULL;
 147     krb5_error_code kerr;
 148     char *tmp, *p, *host = NULL;
 149
 150     tmp = malloc (input_name_buffer->length + 1);
 151     if (tmp == NULL) {
 152         *minor_status = ENOMEM;
 153         return GSS_S_FAILURE;
 154     }
 155     memcpy (tmp,
 156             input_name_buffer->value,
 157             input_name_buffer->length);
 158     tmp[input_name_buffer->length] = '\0';
 159
 160     p = strchr (tmp, '@');
 161     if (p != NULL) {
 162         *p = '\0';
 163         host = p + 1;
 164     }
 165
 166     kerr = krb5_make_principal(context, &princ, "", tmp, host, NULL);
 167     free (tmp);
 168     *minor_status = kerr;
 169     if (kerr == KRB5_PARSE_ILLCHAR || kerr == KRB5_PARSE_MALFORMED)
 170         return GSS_S_BAD_NAME;
 171     else if (kerr)
 172         return GSS_S_FAILURE;
 173
 174     krb5_principal_set_type(context, princ, KRB5_NT_SRV_HST);
 175     *output_name = (gss_name_t)princ;
 176
 177     return 0;
 178 }
 179
 180 static OM_uint32
 181 import_export_name (OM_uint32 *minor_status,
 182                     krb5_context context,
 183                     const gss_buffer_t input_name_buffer,
 184                     gss_name_t *output_name)
 185 {
 186     unsigned char *p;
 187     uint32_t length;
 188     OM_uint32 ret;
 189     char *name;
 190
 191     if (input_name_buffer->length < 10 + GSS_KRB5_MECHANISM->length)
 192         return GSS_S_BAD_NAME;
 193
 194     /* TOK, MECH_OID_LEN, DER(MECH_OID), NAME_LEN, NAME */
 195
 196     p = input_name_buffer->value;
 197
 198     if (memcmp(&p[0], "\x04\x01\x00", 3) != 0 ||
 199         p[3] != GSS_KRB5_MECHANISM->length + 2 ||
 200         p[4] != 0x06 ||
 201         p[5] != GSS_KRB5_MECHANISM->length ||
 202         memcmp(&p[6], GSS_KRB5_MECHANISM->elements,
 203                GSS_KRB5_MECHANISM->length) != 0)
 204         return GSS_S_BAD_NAME;
 205
 206     p += 6 + GSS_KRB5_MECHANISM->length;
 207
 208     length = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
 209     p += 4;
 210
 211     if (length > input_name_buffer->length - 10 - GSS_KRB5_MECHANISM->length)
 212         return GSS_S_BAD_NAME;
 213
 214     name = malloc(length + 1);
 215     if (name == NULL) {
 216         *minor_status = ENOMEM;
 217         return GSS_S_FAILURE;
 218     }
 219     memcpy(name, p, length);
 220     name[length] = '\0';
 221
 222     ret = parse_krb5_name(minor_status, context, name, output_name);
 223     free(name);
 224
 225     return ret;
 226 }
 227
 228 OM_uint32 GSSAPI_CALLCONV _gsskrb5_import_name
 229            (OM_uint32 * minor_status,
 230             const gss_buffer_t input_name_buffer,
 231             const gss_OID input_name_type,
 232             gss_name_t * output_name
 233            )
 234 {
 235     krb5_context context;
 236
 237     *minor_status = 0;
 238     *output_name = GSS_C_NO_NAME;
 239
 240     GSSAPI_KRB5_INIT (&context);
 241
 242     if (gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE) ||
 243         gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE_X))
 244         return import_hostbased_name (minor_status,
 245                                       context,
 246                                       input_name_buffer,
 247                                       output_name);
 248     else if (input_name_type == GSS_C_NO_OID
 249              || gss_oid_equal(input_name_type, GSS_C_NT_USER_NAME)
 250              || gss_oid_equal(input_name_type, GSS_KRB5_NT_PRINCIPAL_NAME))
 251         /* default printable syntax */
 252         return import_krb5_name (minor_status,
 253                                  context,
 254                                  input_name_buffer,
 255                                  output_name);
 256     else if (gss_oid_equal(input_name_type, GSS_C_NT_EXPORT_NAME)) {
 257         return import_export_name(minor_status,
 258                                   context,
 259                                   input_name_buffer,
 260                                   output_name);
 261     } else {
 262         *minor_status = 0;
 263         return GSS_S_BAD_NAMETYPE;
 264     }
 265 }