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