www.project-moonshot.org Git - mech_eap.orig/blob - util_mech.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 /*
  36  * 1.3.6.1.4.1.5322(padl)
  37  *      gssEap(21)
  38  *       mechanisms(1)
  39  *        eap-aes128-cts-hmac-sha1-96(17)
  40  *        eap-aes256-cts-hmac-sha1-96(18)
  41  *       nameTypes(2)
  42  *       apiExtensions(3)
  43  *        inquireSecContextByOid(1)
  44  *        inquireCredByOid(2)
  45  *        setSecContextOption(3)
  46  *        setCredOption(4)
  47  *        mechInvoke(5)
  48  */
  49
  50 static gss_OID_desc gssEapConcreteMechs[] = {
  51     /* 1.3.6.1.4.1.5322.21.1  */
  52     { 9, "\x2B\x06\x01\x04\x01\xA9\x4A\x15\x01" },
  53     /* 1.3.6.1.4.1.5322.21.1.17 */
  54     { 10, "\x2B\x06\x01\x04\x01\xA9\x4A\x15\x01\x11" },
  55     /* 1.3.6.1.4.1.5322.21.1.18 */
  56     { 10, "\x2B\x06\x01\x04\x01\xA9\x4A\x15\x01\x12" }
  57 };
  58
  59 gss_OID GSS_EAP_MECHANISM                            = &gssEapConcreteMechs[0];
  60 gss_OID GSS_EAP_AES128_CTS_HMAC_SHA1_96_MECHANISM    = &gssEapConcreteMechs[1];
  61 gss_OID GSS_EAP_AES256_CTS_HMAC_SHA1_96_MECHANISM    = &gssEapConcreteMechs[2];
  62
  63 int
  64 gssEapIsConcreteMechanismOid(const gss_OID oid)
  65 {
  66     return oid->length > GSS_EAP_MECHANISM->length &&
  67            memcmp(oid->elements, GSS_EAP_MECHANISM->elements,
  68                   GSS_EAP_MECHANISM->length) == 0;
  69 }
  70
  71 int
  72 gssEapIsMechanismOid(const gss_OID oid)
  73 {
  74     return oid == GSS_C_NO_OID ||
  75            oidEqual(oid, GSS_EAP_MECHANISM) ||
  76            gssEapIsConcreteMechanismOid(oid);
  77 }
  78
  79 OM_uint32
  80 gssEapValidateMechs(OM_uint32 *minor,
  81                     const gss_OID_set mechs)
  82 {
  83     int i;
  84
  85     *minor = 0;
  86
  87     if (mechs == GSS_C_NO_OID_SET) {
  88         return GSS_S_COMPLETE;
  89     }
  90
  91     for (i = 0; i < mechs->count; i++) {
  92         gss_OID oid = &mechs->elements[i];
  93
  94         if (!gssEapIsMechanismOid(oid))
  95             return GSS_S_BAD_MECH;
  96     }
  97
  98     return GSS_S_COMPLETE;
  99 }
 100
 101 OM_uint32
 102 gssEapOidToEnctype(OM_uint32 *minor,
 103                    const gss_OID oid,
 104                    krb5_enctype *enctype)
 105 {
 106     OM_uint32 major;
 107     int suffix;
 108
 109     major = decomposeOid(minor,
 110                          GSS_EAP_MECHANISM->elements,
 111                          GSS_EAP_MECHANISM->length,
 112                          oid,
 113                          &suffix);
 114     if (major == GSS_S_COMPLETE)
 115         *enctype = suffix;
 116
 117     return major;
 118 }
 119
 120 OM_uint32
 121 gssEapEnctypeToOid(OM_uint32 *minor,
 122                    krb5_enctype enctype,
 123                    gss_OID *pOid)
 124 {
 125     OM_uint32 major;
 126     gss_OID oid;
 127
 128     *pOid = NULL;
 129
 130     oid = (gss_OID)GSSEAP_MALLOC(sizeof(*oid));
 131     if (oid == NULL) {
 132         *minor = ENOMEM;
 133         return GSS_S_FAILURE;
 134     }
 135
 136     oid->elements = GSSEAP_MALLOC(GSS_EAP_MECHANISM->length + 1);
 137     if (oid->elements == NULL) {
 138         *minor = ENOMEM;
 139         free(oid);
 140         return GSS_S_FAILURE;
 141     }
 142
 143     major = composeOid(minor,
 144                        GSS_EAP_MECHANISM->elements,
 145                        GSS_EAP_MECHANISM->length,
 146                        enctype,
 147                        oid);
 148     if (major == GSS_S_COMPLETE) {
 149         gssEapInternalizeOid(oid, pOid);
 150         *pOid = oid;
 151     } else {
 152         free(oid->elements);
 153         free(oid);
 154     }
 155
 156     return major;
 157 }
 158
 159 OM_uint32
 160 gssEapIndicateMechs(OM_uint32 *minor,
 161                     gss_OID_set *mechs)
 162 {
 163     krb5_context krbContext;
 164     OM_uint32 major, tmpMinor;
 165     krb5_enctype *etypes;
 166     int i;
 167
 168     GSSEAP_KRB_INIT(&krbContext);
 169
 170     *minor = krb5_get_permitted_enctypes(krbContext, &etypes);
 171     if (*minor != 0) {
 172         return GSS_S_FAILURE;
 173     }
 174
 175     major = gss_create_empty_oid_set(minor, mechs);
 176     if (GSS_ERROR(major)) {
 177         GSSEAP_FREE(etypes); /* XXX */
 178         return major;
 179     }
 180
 181     for (i = 0; etypes[i] != ENCTYPE_NULL; i++) {
 182         gss_OID mechOid;
 183
 184         /* XXX currently we aren't equipped to encode these enctypes */
 185         if (etypes[i] < 0 || etypes[i] > 127)
 186             continue;
 187
 188         major = gssEapEnctypeToOid(minor, etypes[i], &mechOid);
 189         if (GSS_ERROR(major))
 190             break;
 191
 192         major = gss_add_oid_set_member(minor, mechOid, mechs);
 193         if (GSS_ERROR(major))
 194             break;
 195
 196         gss_release_oid(&tmpMinor, &mechOid);
 197     }
 198
 199     GSSEAP_FREE(etypes); /* XXX */
 200
 201     return major;
 202 }
 203
 204 OM_uint32
 205 gssEapDefaultMech(OM_uint32 *minor,
 206                   gss_OID *oid)
 207 {
 208     gss_OID_set mechs;
 209     OM_uint32 major, tmpMinor;
 210
 211     major = gssEapIndicateMechs(minor, &mechs);
 212     if (GSS_ERROR(major)) {
 213         return major;
 214     }
 215
 216     if (mechs->count == 0) {
 217         gss_release_oid_set(&tmpMinor, &mechs);
 218         return GSS_S_BAD_MECH;
 219     }
 220
 221     if (!gssEapInternalizeOid(&mechs->elements[0], oid)) {
 222         /* don't double-free if we didn't internalize it */
 223         mechs->elements[0].length = 0;
 224         mechs->elements[0].elements = NULL;
 225     }
 226
 227     gss_release_oid_set(&tmpMinor, &mechs);
 228
 229     *minor = 0;
 230     return GSS_S_COMPLETE;
 231 }
 232
 233 int
 234 gssEapInternalizeOid(const gss_OID oid,
 235                      gss_OID *const pInternalizedOid)
 236 {
 237     int i;
 238
 239     *pInternalizedOid = GSS_C_NO_OID;
 240
 241     for (i = 0;
 242          i < sizeof(gssEapConcreteMechs) / sizeof(gssEapConcreteMechs[0]);
 243          i++) {
 244         if (oidEqual(oid, &gssEapConcreteMechs[i])) {
 245             *pInternalizedOid = (const gss_OID)&gssEapConcreteMechs[i];
 246             break;
 247         }
 248     }
 249
 250     if (*pInternalizedOid == GSS_C_NO_OID) {
 251         if (oidEqual(oid, GSS_EAP_NT_PRINCIPAL_NAME))
 252             *pInternalizedOid = (const gss_OID)GSS_EAP_NT_PRINCIPAL_NAME;
 253     }
 254
 255     if (*pInternalizedOid == GSS_C_NO_OID) {
 256         *pInternalizedOid = oid;
 257         return 0;
 258     }
 259
 260     return 1;
 261 }