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     if (cred->krbCredCache != NULL)
  85         krb5_cc_destroy(krbContext, cred->krbCredCache);
  86     if (cred->krbCred != GSS_C_NO_CREDENTIAL)
  87         gssReleaseCred(&tmpMinor, &cred->krbCred);
  88
  89     GSSEAP_MUTEX_DESTROY(&cred->mutex);
  90     memset(cred, 0, sizeof(*cred));
  91     GSSEAP_FREE(cred);
  92     *pCred = NULL;
  93
  94     *minor = 0;
  95     return GSS_S_COMPLETE;
  96 }
  97
  98 OM_uint32
  99 gssEapAcquireCred(OM_uint32 *minor,
 100                   const gss_name_t desiredName,
 101                   const gss_buffer_t password,
 102                   OM_uint32 timeReq,
 103                   const gss_OID_set desiredMechs,
 104                   int credUsage,
 105                   gss_cred_id_t *pCred,
 106                   gss_OID_set *pActualMechs,
 107                   OM_uint32 *timeRec)
 108 {
 109     OM_uint32 major, tmpMinor;
 110     gss_cred_id_t cred;
 111
 112     /* XXX TODO validate with changed set_cred_option API */
 113     *pCred = GSS_C_NO_CREDENTIAL;
 114
 115     major = gssEapAllocCred(minor, &cred);
 116     if (GSS_ERROR(major))
 117         goto cleanup;
 118
 119     switch (credUsage) {
 120     case GSS_C_BOTH:
 121         cred->flags |= CRED_FLAG_INITIATE | CRED_FLAG_ACCEPT;
 122         break;
 123     case GSS_C_INITIATE:
 124         cred->flags |= CRED_FLAG_INITIATE;
 125         break;
 126     case GSS_C_ACCEPT:
 127         cred->flags |= CRED_FLAG_ACCEPT;
 128         break;
 129     default:
 130         major = GSS_S_FAILURE;
 131         goto cleanup;
 132         break;
 133     }
 134
 135     if (desiredName != GSS_C_NO_NAME) {
 136         major = gssEapDuplicateName(minor, desiredName, &cred->name);
 137         if (GSS_ERROR(major))
 138             goto cleanup;
 139     } else {
 140         if (cred->flags & CRED_FLAG_INITIATE) {
 141             gss_buffer_desc buf;
 142
 143             buf.value = getlogin(); /* XXX */
 144             buf.length = strlen((char *)buf.value);
 145
 146             major = gssEapImportName(minor, &buf,
 147                                      GSS_C_NT_USER_NAME, &cred->name);
 148             if (GSS_ERROR(major))
 149                 goto cleanup;
 150         }
 151
 152         cred->flags |= CRED_FLAG_DEFAULT_IDENTITY;
 153     }
 154
 155     if (password != GSS_C_NO_BUFFER) {
 156         major = duplicateBuffer(minor, password, &cred->password);
 157         if (GSS_ERROR(major))
 158             goto cleanup;
 159
 160         cred->flags |= CRED_FLAG_PASSWORD;
 161     }
 162
 163     major = gssEapValidateMechs(minor, desiredMechs);
 164     if (GSS_ERROR(major))
 165         goto cleanup;
 166
 167     major = duplicateOidSet(minor, desiredMechs, &cred->mechanisms);
 168     if (GSS_ERROR(major))
 169         goto cleanup;
 170
 171     if (pActualMechs != NULL) {
 172         major = duplicateOidSet(minor, cred->mechanisms, pActualMechs);
 173         if (GSS_ERROR(major))
 174             goto cleanup;
 175     }
 176
 177     if (timeRec != NULL)
 178         *timeRec = GSS_C_INDEFINITE;
 179
 180     *pCred = cred;
 181     major = GSS_S_COMPLETE;
 182
 183 cleanup:
 184     if (GSS_ERROR(major))
 185         gssEapReleaseCred(&tmpMinor, &cred);
 186
 187     return major;
 188 }
 189
 190 int
 191 gssEapCredAvailable(gss_cred_id_t cred, gss_OID mech)
 192 {
 193     OM_uint32 minor;
 194     int present = 0;
 195
 196     assert(mech != GSS_C_NO_OID);
 197
 198     if (cred == GSS_C_NO_CREDENTIAL || cred->mechanisms == GSS_C_NO_OID_SET)
 199         return TRUE;
 200
 201     gss_test_oid_set_member(&minor, mech, cred->mechanisms, &present);
 202
 203     return present;
 204 }