mech_eap/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         krb5_cc_destroy(krbContext, cred->krbCredCache);
  87     if (cred->krbCred != GSS_C_NO_CREDENTIAL)
  88         gssReleaseCred(&tmpMinor, &cred->krbCred);
  89 #endif
  90
  91     GSSEAP_MUTEX_DESTROY(&cred->mutex);
  92     memset(cred, 0, sizeof(*cred));
  93     GSSEAP_FREE(cred);
  94     *pCred = NULL;
  95
  96     *minor = 0;
  97     return GSS_S_COMPLETE;
  98 }
  99
 100 OM_uint32
 101 gssEapAcquireCred(OM_uint32 *minor,
 102                   const gss_name_t desiredName,
 103                   const gss_buffer_t password,
 104                   OM_uint32 timeReq,
 105                   const gss_OID_set desiredMechs,
 106                   int credUsage,
 107                   gss_cred_id_t *pCred,
 108                   gss_OID_set *pActualMechs,
 109                   OM_uint32 *timeRec)
 110 {
 111     OM_uint32 major, tmpMinor;
 112     gss_cred_id_t cred;
 113
 114     /* XXX TODO validate with changed set_cred_option API */
 115     *pCred = GSS_C_NO_CREDENTIAL;
 116
 117     major = gssEapAllocCred(minor, &cred);
 118     if (GSS_ERROR(major))
 119         goto cleanup;
 120
 121     if (password != GSS_C_NO_BUFFER) {
 122         major = duplicateBuffer(minor, password, &cred->password);
 123         if (GSS_ERROR(major))
 124             goto cleanup;
 125
 126         cred->flags |= CRED_FLAG_PASSWORD;
 127     } else if (credUsage == GSS_C_INITIATE) {
 128         /*
 129          * OK, here we need to ask the supplicant if we have creds or it
 130          * will acquire them, so GS2 can know whether to prompt for a
 131          * password or not.
 132          */
 133         major = GSS_S_CRED_UNAVAIL;
 134         goto cleanup;
 135     }
 136
 137     switch (credUsage) {
 138     case GSS_C_BOTH:
 139         cred->flags |= CRED_FLAG_INITIATE | CRED_FLAG_ACCEPT;
 140         break;
 141     case GSS_C_INITIATE:
 142         cred->flags |= CRED_FLAG_INITIATE;
 143         break;
 144     case GSS_C_ACCEPT:
 145         cred->flags |= CRED_FLAG_ACCEPT;
 146         break;
 147     default:
 148         major = GSS_S_FAILURE;
 149         goto cleanup;
 150         break;
 151     }
 152
 153     if (desiredName != GSS_C_NO_NAME) {
 154         major = gssEapDuplicateName(minor, desiredName, &cred->name);
 155         if (GSS_ERROR(major))
 156             goto cleanup;
 157     } else {
 158         if (cred->flags & CRED_FLAG_INITIATE) {
 159             gss_buffer_desc buf;
 160
 161             buf.value = getlogin(); /* XXX */
 162             buf.length = strlen((char *)buf.value);
 163
 164             major = gssEapImportName(minor, &buf,
 165                                      GSS_C_NT_USER_NAME, &cred->name);
 166             if (GSS_ERROR(major))
 167                 goto cleanup;
 168         }
 169
 170         cred->flags |= CRED_FLAG_DEFAULT_IDENTITY;
 171     }
 172
 173     major = gssEapValidateMechs(minor, desiredMechs);
 174     if (GSS_ERROR(major))
 175         goto cleanup;
 176
 177     major = duplicateOidSet(minor, desiredMechs, &cred->mechanisms);
 178     if (GSS_ERROR(major))
 179         goto cleanup;
 180
 181     if (pActualMechs != NULL) {
 182         major = duplicateOidSet(minor, cred->mechanisms, pActualMechs);
 183         if (GSS_ERROR(major))
 184             goto cleanup;
 185     }
 186
 187     if (timeRec != NULL)
 188         *timeRec = GSS_C_INDEFINITE;
 189
 190     *pCred = cred;
 191     major = GSS_S_COMPLETE;
 192
 193 cleanup:
 194     if (GSS_ERROR(major))
 195         gssEapReleaseCred(&tmpMinor, &cred);
 196
 197     return major;
 198 }
 199
 200 int
 201 gssEapCredAvailable(gss_cred_id_t cred, gss_OID mech)
 202 {
 203     OM_uint32 minor;
 204     int present = 0;
 205
 206     assert(mech != GSS_C_NO_OID);
 207
 208     if (cred == GSS_C_NO_CREDENTIAL || cred->mechanisms == GSS_C_NO_OID_SET)
 209         return TRUE;
 210
 211     gss_test_oid_set_member(&minor, mech, cred->mechanisms, &present);
 212
 213     return present;
 214 }