2 * Copyright (c) 2011, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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.
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.
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
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include "gssapiP_eap.h"
39 static GSSEAP_THREAD_ONCE krbContextKeyOnce = GSSEAP_ONCE_INITIALIZER;
40 static GSSEAP_THREAD_KEY krbContextKey;
43 destroyKrbContext(void *arg)
45 krb5_context context = (krb5_context)arg;
48 krb5_free_context(context);
52 createKrbContextKey(void)
54 GSSEAP_KEY_CREATE(&krbContextKey, destroyKrbContext);
57 static krb5_error_code
58 initKrbContext(krb5_context *pKrbContext)
60 krb5_context krbContext;
62 char *defaultRealm = NULL;
66 code = krb5_init_context(&krbContext);
70 krb5_appdefault_string(krbContext, "eap_gss",
71 NULL, "default_realm", "", &defaultRealm);
73 if (defaultRealm != NULL && defaultRealm[0] != '\0') {
74 code = krb5_set_default_realm(krbContext, defaultRealm);
79 *pKrbContext = krbContext;
82 if (code != 0 && krbContext != NULL)
83 krb5_free_context(krbContext);
85 if (defaultRealm != NULL)
86 GSSEAP_FREE(defaultRealm);
92 gssEapKerberosInit(OM_uint32 *minor, krb5_context *context)
96 GSSEAP_ONCE(&krbContextKeyOnce, createKrbContextKey);
98 *context = GSSEAP_GETSPECIFIC(krbContextKey);
99 if (*context == NULL) {
100 *minor = initKrbContext(context);
102 if (GSSEAP_SETSPECIFIC(krbContextKey, *context) != 0) {
104 krb5_free_context(*context);
110 return *minor == 0 ? GSS_S_COMPLETE : GSS_S_FAILURE;
114 * Derive a key K for RFC 4121 use by using the following
115 * derivation function (based on RFC 4402);
117 * KMSK = random-to-key(MSK)
118 * Tn = pseudo-random(KMSK, n || "rfc4121-gss-eap")
119 * L = output key size
120 * K = truncate(L, T1 || T2 || .. || Tn)
123 gssEapDeriveRfc3961Key(OM_uint32 *minor,
124 const unsigned char *inputKey,
125 size_t inputKeyLength,
126 krb5_enctype encryptionType,
129 krb5_context krbContext;
130 #ifndef HAVE_HEIMDAL_VERSION
133 krb5_data ns, t, prfOut;
135 krb5_error_code code;
136 size_t randomLength, keyLength, prfLength;
137 unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
140 assert(encryptionType != ENCTYPE_NULL);
142 memset(pKey, 0, sizeof(*pKey));
144 GSSEAP_KRB_INIT(&krbContext);
147 KRB_KEY_TYPE(&kd) = encryptionType;
155 code = krb5_c_keylengths(krbContext, encryptionType,
156 &randomLength, &keyLength);
160 KRB_KEY_DATA(&kd) = GSSEAP_MALLOC(keyLength);
161 if (KRB_KEY_DATA(&kd) == NULL) {
165 KRB_KEY_LENGTH(&kd) = keyLength;
167 /* Convert MSK into a Kerberos key */
168 #ifdef HAVE_HEIMDAL_VERSION
169 code = krb5_random_to_key(krbContext, encryptionType, inputKey,
170 MIN(inputKeyLength, randomLength), &kd);
172 data.length = MIN(inputKeyLength, randomLength);
173 data.data = (char *)inputKey;
175 code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
180 memset(&constant[0], 0, 4);
181 memcpy(&constant[4], "rfc4121-gss-eap", sizeof("rfc4121-gss-eap") - 1);
183 ns.length = sizeof(constant);
184 ns.data = (char *)constant;
186 /* Plug derivation constant and key into PRF */
187 code = krb5_c_prf_length(krbContext, encryptionType, &prfLength);
191 t.length = prfLength;
192 t.data = GSSEAP_MALLOC(t.length);
193 if (t.data == NULL) {
198 prfOut.length = randomLength;
199 prfOut.data = GSSEAP_MALLOC(prfOut.length);
200 if (prfOut.data == NULL) {
205 for (i = 0, p = (unsigned char *)prfOut.data, remain = randomLength;
207 p += t.length, remain -= t.length, i++)
209 store_uint32_be(i, ns.data);
211 code = krb5_c_prf(krbContext, &kd, &ns, &t);
215 memcpy(p, t.data, MIN(t.length, remain));
218 /* Finally, convert PRF output into a new key which we will return */
219 #ifdef HAVE_HEIMDAL_VERSION
220 code = krb5_random_to_key(krbContext, encryptionType,
221 prfOut.data, prfOut.length, &kd);
223 code = krb5_c_random_to_key(krbContext, encryptionType, &prfOut, &kd);
229 KRB_KEY_DATA(&kd) = NULL;
232 if (KRB_KEY_DATA(&kd) != NULL) {
233 memset(KRB_KEY_DATA(&kd), 0, KRB_KEY_LENGTH(&kd));
234 GSSEAP_FREE(KRB_KEY_DATA(&kd));
236 if (t.data != NULL) {
237 memset(t.data, 0, t.length);
240 if (prfOut.data != NULL) {
241 memset(prfOut.data, 0, prfOut.length);
242 GSSEAP_FREE(prfOut.data);
245 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
248 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
249 extern krb5_error_code
250 krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
254 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
256 krb5_cksumtype *cksumtype)
258 krb5_context krbContext;
259 #ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
264 GSSEAP_KRB_INIT(&krbContext);
266 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
267 *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
270 return GSS_S_FAILURE;
275 memset(&cksum, 0, sizeof(cksum));
278 * This is a complete hack but it's the only way to work with
279 * MIT Kerberos pre-1.9 without using private API, as it does
280 * not support passing in zero as the checksum type.
282 *minor = krb5_c_make_checksum(krbContext, 0, key, 0, &data, &cksum);
284 return GSS_S_FAILURE;
286 #ifdef HAVE_HEIMDAL_VERSION
287 *cksumtype = cksum.cksumtype;
289 *cksumtype = cksum.checksum_type;
292 krb5_free_checksum_contents(krbContext, &cksum);
293 #endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
295 if (!krb5_c_is_keyed_cksum(*cksumtype)) {
296 *minor = KRB5KRB_AP_ERR_INAPP_CKSUM;
297 return GSS_S_FAILURE;
300 return GSS_S_COMPLETE;
304 krbCryptoLength(krb5_context krbContext,
305 #ifdef HAVE_HEIMDAL_VERSION
306 krb5_crypto krbCrypto,
313 #ifdef HAVE_HEIMDAL_VERSION
314 return krb5_crypto_length(krbContext, krbCrypto, type, length);
317 krb5_error_code code;
319 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
321 *length = (size_t)len;
328 krbPaddingLength(krb5_context krbContext,
329 #ifdef HAVE_HEIMDAL_VERSION
330 krb5_crypto krbCrypto,
337 krb5_error_code code;
338 #ifdef HAVE_HEIMDAL_VERSION
339 size_t headerLength, paddingLength;
341 code = krbCryptoLength(krbContext, krbCrypto,
342 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
346 dataLength += headerLength;
348 code = krb5_crypto_length(krbContext, krbCrypto,
349 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
353 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
354 *padLength = paddingLength - (dataLength % paddingLength);
362 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
364 *padLength = (size_t)pad;
367 #endif /* HAVE_HEIMDAL_VERSION */
371 krbBlockSize(krb5_context krbContext,
372 #ifdef HAVE_HEIMDAL_VERSION
373 krb5_crypto krbCrypto,
379 #ifdef HAVE_HEIMDAL_VERSION
380 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
382 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
388 #ifdef HAVE_HEIMDAL_VERSION
389 krb5_context krbContext,
391 krb5_context krbContext GSSEAP_UNUSED,
393 krb5_enctype enctype,
397 krb5_error_code code;
398 #ifdef HAVE_HEIMDAL_VERSION
399 char *enctypeBuf = NULL;
401 char enctypeBuf[128];
403 size_t prefixLength, enctypeLength;
405 #ifdef HAVE_HEIMDAL_VERSION
406 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
408 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
413 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
414 enctypeLength = strlen(enctypeBuf);
416 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
417 if (string->value == NULL) {
418 #ifdef HAVE_HEIMDAL_VERSION
419 krb5_xfree(enctypeBuf);
424 if (prefixLength != 0)
425 memcpy(string->value, prefix, prefixLength);
426 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
428 string->length = prefixLength + enctypeLength;
429 ((char *)string->value)[string->length] = '\0';
431 #ifdef HAVE_HEIMDAL_VERSION
432 krb5_xfree(enctypeBuf);
439 krbMakeAuthDataKdcIssued(krb5_context context,
440 const krb5_keyblock *key,
441 krb5_const_principal issuer,
442 #ifdef HAVE_HEIMDAL_VERSION
443 const AuthorizationData *authdata,
444 AuthorizationData *adKdcIssued
446 krb5_authdata *const *authdata,
447 krb5_authdata ***adKdcIssued
451 #ifdef HAVE_HEIMDAL_VERSION
452 krb5_error_code code;
453 AD_KDCIssued kdcIssued;
454 AuthorizationDataElement adDatum;
456 size_t buf_size, len;
457 krb5_crypto crypto = NULL;
459 memset(&kdcIssued, 0, sizeof(kdcIssued));
460 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
462 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
463 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
464 kdcIssued.elements = *authdata;
466 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
470 code = krb5_crypto_init(context, key, 0, &crypto);
474 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
475 0, buf, buf_size, &kdcIssued.ad_checksum);
482 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
486 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
487 adDatum.ad_data.length = buf_size;
488 adDatum.ad_data.data = buf;
490 code = add_AuthorizationData(adKdcIssued, &adDatum);
498 krb5_crypto_destroy(context, crypto);
499 free_Checksum(&kdcIssued.ad_checksum);
503 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
505 #endif /* HAVE_HEIMDAL_VERSION */
509 krbMakeCred(krb5_context krbContext,
510 krb5_auth_context authContext,
514 krb5_error_code code;
515 #ifdef HAVE_HEIMDAL_VERSION
517 KrbCredInfo krbCredInfo;
518 EncKrbCredPart encKrbCredPart;
520 krb5_crypto krbCrypto = NULL;
521 krb5_data encKrbCredPartData;
522 krb5_replay_data rdata;
528 memset(data, 0, sizeof(*data));
529 #ifdef HAVE_HEIMDAL_VERSION
530 memset(&krbCred, 0, sizeof(krbCred));
531 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
532 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
533 memset(&rdata, 0, sizeof(rdata));
535 if (authContext->local_subkey)
536 key = authContext->local_subkey;
537 else if (authContext->remote_subkey)
538 key = authContext->remote_subkey;
540 key = authContext->keyblock;
543 krbCred.msg_type = krb_cred;
544 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
545 if (krbCred.tickets.val == NULL) {
549 krbCred.tickets.len = 1;
551 code = decode_Ticket(creds->ticket.data,
552 creds->ticket.length,
553 krbCred.tickets.val, &len);
557 krbCredInfo.key = creds->session;
558 krbCredInfo.prealm = &creds->client->realm;
559 krbCredInfo.pname = &creds->client->name;
560 krbCredInfo.flags = &creds->flags.b;
561 krbCredInfo.authtime = &creds->times.authtime;
562 krbCredInfo.starttime = &creds->times.starttime;
563 krbCredInfo.endtime = &creds->times.endtime;
564 krbCredInfo.renew_till = &creds->times.renew_till;
565 krbCredInfo.srealm = &creds->server->realm;
566 krbCredInfo.sname = &creds->server->name;
567 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
569 encKrbCredPart.ticket_info.len = 1;
570 encKrbCredPart.ticket_info.val = &krbCredInfo;
571 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
572 rdata.seq = authContext->local_seqnumber;
573 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
575 encKrbCredPart.nonce = NULL;
577 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
578 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
579 encKrbCredPart.timestamp = &rdata.timestamp;
580 encKrbCredPart.usec = &rdata.usec;
582 encKrbCredPart.timestamp = NULL;
583 encKrbCredPart.usec = NULL;
585 encKrbCredPart.s_address = authContext->local_address;
586 encKrbCredPart.r_address = authContext->remote_address;
588 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
589 encKrbCredPartData.length, &encKrbCredPart,
594 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
598 code = krb5_encrypt_EncryptedData(krbContext,
601 encKrbCredPartData.data,
602 encKrbCredPartData.length,
608 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
609 &krbCred, &len, code);
613 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
614 authContext->local_seqnumber++;
617 if (krbCrypto != NULL)
618 krb5_crypto_destroy(krbContext, krbCrypto);
619 free_KRB_CRED(&krbCred);
620 krb5_data_free(&encKrbCredPartData);
624 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
631 #endif /* HAVE_HEIMDAL_VERSION */