util_cred.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 /*
  34  * Utility routines for credential handles.
  35  */
  36
  37 #include "gssapiP_eap.h"
  38
  39 OM_uint32
  40 gssEapAllocCred(OM_uint32 *minor, gss_cred_id_t *pCred)
  41 {
  42     OM_uint32 tmpMinor;
  43     gss_cred_id_t cred;
  44
  45     *pCred = GSS_C_NO_CREDENTIAL;
  46
  47     cred = (gss_cred_id_t)GSSEAP_CALLOC(1, sizeof(*cred));
  48     if (cred == NULL) {
  49         *minor = ENOMEM;
  50         return GSS_S_FAILURE;
  51     }
  52
  53     if (GSSEAP_MUTEX_INIT(&cred->mutex) != 0) {
  54         *minor = errno;
  55         gssEapReleaseCred(&tmpMinor, &cred);
  56         return GSS_S_FAILURE;
  57     }
  58
  59     *pCred = cred;
  60
  61     *minor = 0;
  62     return GSS_S_COMPLETE;
  63 }
  64
  65 OM_uint32
  66 gssEapReleaseCred(OM_uint32 *minor, gss_cred_id_t *pCred)
  67 {
  68     OM_uint32 tmpMinor;
  69     gss_cred_id_t cred = *pCred;
  70     krb5_context krbContext = NULL;
  71
  72     if (cred == GSS_C_NO_CREDENTIAL) {
  73         return GSS_S_COMPLETE;
  74     }
  75
  76     GSSEAP_KRB_INIT(&krbContext);
  77
  78     gssEapReleaseName(&tmpMinor, &cred->name);
  79
  80     if (cred->password.value != NULL) {
  81         memset(cred->password.value, 0, cred->password.length);
  82         GSSEAP_FREE(cred->password.value);
  83     }
  84
  85     if (cred->radiusConfigFile != NULL)
  86         GSSEAP_FREE(cred->radiusConfigFile);
  87     if (cred->radiusConfigStanza != NULL)
  88         GSSEAP_FREE(cred->radiusConfigStanza);
  89
  90 #ifdef GSSEAP_ENABLE_REAUTH
  91     if (cred->krbCredCache != NULL) {
  92         if (cred->flags & CRED_FLAG_DEFAULT_CCACHE)
  93             krb5_cc_close(krbContext, cred->krbCredCache);
  94         else
  95             krb5_cc_destroy(krbContext, cred->krbCredCache);
  96     }
  97     if (cred->krbCred != GSS_C_NO_CREDENTIAL)
  98         gssReleaseCred(&tmpMinor, &cred->krbCred);
  99 #endif
 100
 101     GSSEAP_MUTEX_DESTROY(&cred->mutex);
 102     memset(cred, 0, sizeof(*cred));
 103     GSSEAP_FREE(cred);
 104     *pCred = NULL;
 105
 106     *minor = 0;
 107     return GSS_S_COMPLETE;
 108 }
 109
 110 OM_uint32
 111 gssEapAcquireCred(OM_uint32 *minor,
 112                   const gss_name_t desiredName,
 113                   const gss_buffer_t password,
 114                   OM_uint32 timeReq,
 115                   const gss_OID_set desiredMechs,
 116                   int credUsage,
 117                   gss_cred_id_t *pCred,
 118                   gss_OID_set *pActualMechs,
 119                   OM_uint32 *timeRec)
 120 {
 121     OM_uint32 major, tmpMinor;
 122     gss_cred_id_t cred;
 123
 124     /* XXX TODO validate with changed set_cred_option API */
 125     *pCred = GSS_C_NO_CREDENTIAL;
 126
 127     major = gssEapAllocCred(minor, &cred);
 128     if (GSS_ERROR(major))
 129         goto cleanup;
 130
 131     if (desiredName != GSS_C_NO_NAME) {
 132         GSSEAP_MUTEX_LOCK(&desiredName->mutex);
 133
 134         major = gssEapDuplicateName(minor, desiredName, &cred->name);
 135         if (GSS_ERROR(major)) {
 136             GSSEAP_MUTEX_UNLOCK(&desiredName->mutex);
 137             goto cleanup;
 138         }
 139
 140         GSSEAP_MUTEX_UNLOCK(&desiredName->mutex);
 141     } else {
 142         gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 143         gss_OID nameType = GSS_C_NO_OID;
 144
 145         if (cred->flags & CRED_FLAG_ACCEPT) {
 146             char serviceName[5 + MAXHOSTNAMELEN] = "host@";
 147
 148             /* default host-based service is host@localhost */
 149             if (gethostname(&serviceName[5], MAXHOSTNAMELEN) != 0) {
 150                 major = GSS_S_FAILURE;
 151                 *minor = GSSEAP_NO_HOSTNAME;
 152                 goto cleanup;
 153             }
 154
 155             nameBuf.value = serviceName;
 156             nameBuf.length = strlen((char *)nameBuf.value);
 157
 158             nameType = GSS_C_NT_HOSTBASED_SERVICE;
 159         } else if (cred->flags & CRED_FLAG_INITIATE) {
 160             nameBuf.value = getlogin(); /* XXX */
 161             nameBuf.length = strlen((char *)nameBuf.value);
 162
 163             nameType = GSS_C_NT_USER_NAME;
 164         }
 165
 166         if (nameBuf.length != 0) {
 167             major = gssEapImportName(minor, &nameBuf, nameType, &cred->name);
 168             if (GSS_ERROR(major))
 169                 goto cleanup;
 170         }
 171
 172         cred->flags |= CRED_FLAG_DEFAULT_IDENTITY;
 173     }
 174
 175     if (password != GSS_C_NO_BUFFER) {
 176         major = duplicateBuffer(minor, password, &cred->password);
 177         if (GSS_ERROR(major))
 178             goto cleanup;
 179
 180         cred->flags |= CRED_FLAG_PASSWORD;
 181     } else if (credUsage == GSS_C_INITIATE) {
 182         /*
 183          * OK, here we need to ask the supplicant if we have creds or it
 184          * will acquire them, so GS2 can know whether to prompt for a
 185          * password or not.
 186          */
 187 #if 0
 188         && !gssEapCanReauthP(cred, GSS_C_NO_NAME, timeReq)
 189 #endif
 190         major = GSS_S_CRED_UNAVAIL;
 191         goto cleanup;
 192     }
 193
 194     switch (credUsage) {
 195     case GSS_C_BOTH:
 196         cred->flags |= CRED_FLAG_INITIATE | CRED_FLAG_ACCEPT;
 197         break;
 198     case GSS_C_INITIATE:
 199         cred->flags |= CRED_FLAG_INITIATE;
 200         break;
 201     case GSS_C_ACCEPT:
 202         cred->flags |= CRED_FLAG_ACCEPT;
 203         break;
 204     default:
 205         major = GSS_S_FAILURE;
 206         *minor = GSSEAP_BAD_USAGE;
 207         goto cleanup;
 208         break;
 209     }
 210
 211     major = gssEapValidateMechs(minor, desiredMechs);
 212     if (GSS_ERROR(major))
 213         goto cleanup;
 214
 215     major = duplicateOidSet(minor, desiredMechs, &cred->mechanisms);
 216     if (GSS_ERROR(major))
 217         goto cleanup;
 218
 219     if (pActualMechs != NULL) {
 220         major = duplicateOidSet(minor, cred->mechanisms, pActualMechs);
 221         if (GSS_ERROR(major))
 222             goto cleanup;
 223     }
 224
 225     if (timeRec != NULL)
 226         *timeRec = GSS_C_INDEFINITE;
 227
 228     *pCred = cred;
 229
 230     major = GSS_S_COMPLETE;
 231     *minor = 0;
 232
 233 cleanup:
 234     if (GSS_ERROR(major))
 235         gssEapReleaseCred(&tmpMinor, &cred);
 236
 237     return major;
 238 }
 239
 240 /*
 241  * Return TRUE if cred available for mechanism. Caller need no acquire
 242  * lock because mechanisms list is immutable.
 243  */
 244 int
 245 gssEapCredAvailable(gss_cred_id_t cred, gss_OID mech)
 246 {
 247     OM_uint32 minor;
 248     int present = 0;
 249
 250     assert(mech != GSS_C_NO_OID);
 251
 252     if (cred == GSS_C_NO_CREDENTIAL || cred->mechanisms == GSS_C_NO_OID_SET)
 253         return TRUE;
 254
 255     gss_test_oid_set_member(&minor, mech, cred->mechanisms, &present);
 256
 257     return present;
 258 }