2 * Copyright (c) 2011, JANET(UK)
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37 #include "gssapiP_eap.h"
40 gssEapDestroyKrbContext(krb5_context context)
43 krb5_free_context(context);
46 static krb5_error_code
47 initKrbContext(krb5_context *pKrbContext)
49 krb5_context krbContext;
51 char *defaultRealm = NULL;
55 code = krb5_init_context(&krbContext);
59 krb5_appdefault_string(krbContext, "eap_gss",
60 NULL, "default_realm", "", &defaultRealm);
62 if (defaultRealm != NULL && defaultRealm[0] != '\0') {
63 code = krb5_set_default_realm(krbContext, defaultRealm);
68 *pKrbContext = krbContext;
71 krb5_free_default_realm(krbContext, defaultRealm);
73 if (code != 0 && krbContext != NULL)
74 krb5_free_context(krbContext);
80 gssEapKerberosInit(OM_uint32 *minor, krb5_context *context)
82 struct gss_eap_thread_local_data *tld;
87 tld = gssEapGetThreadLocalData();
89 if (tld->krbContext == NULL) {
90 *minor = initKrbContext(&tld->krbContext);
92 tld->krbContext = NULL;
94 *context = tld->krbContext;
96 *minor = GSSEAP_GET_LAST_ERROR();
99 GSSEAP_ASSERT(*context != NULL || *minor != 0);
101 return (*minor == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
105 * Derive a key K for RFC 4121 use by using the following
106 * derivation function (based on RFC 4402);
108 * KMSK = random-to-key(MSK)
109 * Tn = pseudo-random(KMSK, n || "rfc4121-gss-eap")
110 * L = output key size
111 * K = truncate(L, T1 || T2 || .. || Tn)
113 * The output must be freed by krb5_free_keyblock_contents(),
117 gssEapDeriveRfc3961Key(OM_uint32 *minor,
118 const unsigned char *inputKey,
119 size_t inputKeyLength,
120 krb5_enctype encryptionType,
123 krb5_context krbContext;
124 #ifndef HAVE_HEIMDAL_VERSION
127 krb5_data ns, t, derivedKeyData;
129 krb5_error_code code;
130 size_t randomLength, keyLength, prfLength;
131 unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
134 GSSEAP_KRB_INIT(&krbContext);
135 GSSEAP_ASSERT(encryptionType != ENCTYPE_NULL);
139 KRB_KEY_TYPE(&kd) = encryptionType;
143 KRB_DATA_INIT(&derivedKeyData);
145 code = krb5_c_keylengths(krbContext, encryptionType,
146 &randomLength, &keyLength);
150 /* Convert EAP MSK into a Kerberos key */
152 #ifdef HAVE_HEIMDAL_VERSION
153 code = krb5_random_to_key(krbContext, encryptionType, inputKey,
154 MIN(inputKeyLength, randomLength), &kd);
156 data.length = MIN(inputKeyLength, randomLength);
157 data.data = (char *)inputKey;
159 KRB_KEY_DATA(&kd) = KRB_MALLOC(keyLength);
160 if (KRB_KEY_DATA(&kd) == NULL) {
164 KRB_KEY_LENGTH(&kd) = keyLength;
166 code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
167 #endif /* HAVE_HEIMDAL_VERSION */
171 memset(&constant[0], 0, 4);
172 memcpy(&constant[4], "rfc4121-gss-eap", sizeof("rfc4121-gss-eap") - 1);
174 ns.length = sizeof(constant);
175 ns.data = (char *)constant;
177 /* Plug derivation constant and key into PRF */
178 code = krb5_c_prf_length(krbContext, encryptionType, &prfLength);
182 #ifndef HAVE_HEIMDAL_VERSION
183 /* Same API, but different allocation rules, unfortunately. */
184 t.length = prfLength;
185 t.data = GSSEAP_MALLOC(t.length);
186 if (t.data == NULL) {
192 derivedKeyData.length = randomLength;
193 derivedKeyData.data = GSSEAP_MALLOC(derivedKeyData.length);
194 if (derivedKeyData.data == NULL) {
199 for (i = 0, p = (unsigned char *)derivedKeyData.data, remain = randomLength;
201 p += t.length, remain -= t.length, i++)
203 store_uint32_be(i, ns.data);
205 code = krb5_c_prf(krbContext, &kd, &ns, &t);
209 memcpy(p, t.data, MIN(t.length, remain));
212 /* Finally, convert PRF output into a new key which we will return */
213 #ifdef HAVE_HEIMDAL_VERSION
214 krb5_free_keyblock_contents(krbContext, &kd);
217 code = krb5_random_to_key(krbContext, encryptionType,
218 derivedKeyData.data, derivedKeyData.length, &kd);
220 code = krb5_c_random_to_key(krbContext, encryptionType,
221 &derivedKeyData, &kd);
230 krb5_free_keyblock_contents(krbContext, &kd);
231 #ifdef HAVE_HEIMDAL_VERSION
234 if (t.data != NULL) {
235 memset(t.data, 0, t.length);
239 if (derivedKeyData.data != NULL) {
240 memset(derivedKeyData.data, 0, derivedKeyData.length);
241 GSSEAP_FREE(derivedKeyData.data);
246 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
249 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
250 extern krb5_error_code
251 krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
255 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
257 krb5_cksumtype *cksumtype)
259 krb5_context krbContext;
260 #ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
265 GSSEAP_KRB_INIT(&krbContext);
267 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
268 *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
271 return GSS_S_FAILURE;
273 KRB_DATA_INIT(&data);
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 *cksumtype = KRB_CHECKSUM_TYPE(&cksum);
288 krb5_free_checksum_contents(krbContext, &cksum);
289 #endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
291 if (!krb5_c_is_keyed_cksum(*cksumtype)) {
292 *minor = (OM_uint32)KRB5KRB_AP_ERR_INAPP_CKSUM;
293 return GSS_S_FAILURE;
296 return GSS_S_COMPLETE;
300 krbCryptoLength(krb5_context krbContext,
301 #ifdef HAVE_HEIMDAL_VERSION
302 krb5_crypto krbCrypto,
309 #ifdef HAVE_HEIMDAL_VERSION
310 return krb5_crypto_length(krbContext, krbCrypto, type, length);
313 krb5_error_code code;
315 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
317 *length = (size_t)len;
324 krbPaddingLength(krb5_context krbContext,
325 #ifdef HAVE_HEIMDAL_VERSION
326 krb5_crypto krbCrypto,
333 krb5_error_code code;
334 #ifdef HAVE_HEIMDAL_VERSION
335 size_t headerLength, paddingLength;
337 code = krbCryptoLength(krbContext, krbCrypto,
338 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
342 dataLength += headerLength;
344 code = krb5_crypto_length(krbContext, krbCrypto,
345 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
349 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
350 *padLength = paddingLength - (dataLength % paddingLength);
358 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
360 *padLength = (size_t)pad;
363 #endif /* HAVE_HEIMDAL_VERSION */
367 krbBlockSize(krb5_context krbContext,
368 #ifdef HAVE_HEIMDAL_VERSION
369 krb5_crypto krbCrypto,
375 #ifdef HAVE_HEIMDAL_VERSION
376 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
378 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
384 #ifdef HAVE_HEIMDAL_VERSION
385 krb5_context krbContext,
387 krb5_context krbContext GSSEAP_UNUSED,
389 krb5_enctype enctype,
393 krb5_error_code code;
394 #ifdef HAVE_HEIMDAL_VERSION
395 char *enctypeBuf = NULL;
397 char enctypeBuf[128];
399 size_t prefixLength, enctypeLength;
401 #ifdef HAVE_HEIMDAL_VERSION
402 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
404 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
409 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
410 enctypeLength = strlen(enctypeBuf);
412 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
413 if (string->value == NULL) {
414 #ifdef HAVE_HEIMDAL_VERSION
415 krb5_xfree(enctypeBuf);
420 if (prefixLength != 0)
421 memcpy(string->value, prefix, prefixLength);
422 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
424 string->length = prefixLength + enctypeLength;
425 ((char *)string->value)[string->length] = '\0';
427 #ifdef HAVE_HEIMDAL_VERSION
428 krb5_xfree(enctypeBuf);
435 krbMakeAuthDataKdcIssued(krb5_context context,
436 const krb5_keyblock *key,
437 krb5_const_principal issuer,
438 #ifdef HAVE_HEIMDAL_VERSION
439 const AuthorizationData *authdata,
440 AuthorizationData *adKdcIssued
442 krb5_authdata *const *authdata,
443 krb5_authdata ***adKdcIssued
447 #ifdef HAVE_HEIMDAL_VERSION
448 krb5_error_code code;
449 AD_KDCIssued kdcIssued;
450 AuthorizationDataElement adDatum;
452 size_t buf_size, len;
453 krb5_crypto crypto = NULL;
455 memset(&kdcIssued, 0, sizeof(kdcIssued));
456 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
458 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
459 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
460 kdcIssued.elements = *authdata;
462 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
466 code = krb5_crypto_init(context, key, 0, &crypto);
470 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
471 0, buf, buf_size, &kdcIssued.ad_checksum);
475 free(buf); /* match ASN1_MALLOC_ENCODE */
478 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
482 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
483 adDatum.ad_data.length = buf_size;
484 adDatum.ad_data.data = buf;
486 code = add_AuthorizationData(adKdcIssued, &adDatum);
492 free(buf); /* match ASN1_MALLOC_ENCODE */
494 krb5_crypto_destroy(context, crypto);
495 free_Checksum(&kdcIssued.ad_checksum);
499 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
501 #endif /* HAVE_HEIMDAL_VERSION */
505 krbMakeCred(krb5_context krbContext,
506 krb5_auth_context authContext,
510 krb5_error_code code;
511 #ifdef HAVE_HEIMDAL_VERSION
513 KrbCredInfo krbCredInfo;
514 EncKrbCredPart encKrbCredPart;
516 krb5_crypto krbCrypto = NULL;
517 krb5_data encKrbCredPartData;
518 krb5_replay_data rdata;
524 memset(data, 0, sizeof(*data));
525 #ifdef HAVE_HEIMDAL_VERSION
526 memset(&krbCred, 0, sizeof(krbCred));
527 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
528 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
529 memset(&rdata, 0, sizeof(rdata));
531 if (authContext->local_subkey)
532 key = authContext->local_subkey;
533 else if (authContext->remote_subkey)
534 key = authContext->remote_subkey;
536 key = authContext->keyblock;
539 krbCred.msg_type = krb_cred;
540 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
541 if (krbCred.tickets.val == NULL) {
545 krbCred.tickets.len = 1;
547 code = decode_Ticket(creds->ticket.data,
548 creds->ticket.length,
549 krbCred.tickets.val, &len);
553 krbCredInfo.key = creds->session;
554 krbCredInfo.prealm = &creds->client->realm;
555 krbCredInfo.pname = &creds->client->name;
556 krbCredInfo.flags = &creds->flags.b;
557 krbCredInfo.authtime = &creds->times.authtime;
558 krbCredInfo.starttime = &creds->times.starttime;
559 krbCredInfo.endtime = &creds->times.endtime;
560 krbCredInfo.renew_till = &creds->times.renew_till;
561 krbCredInfo.srealm = &creds->server->realm;
562 krbCredInfo.sname = &creds->server->name;
563 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
565 encKrbCredPart.ticket_info.len = 1;
566 encKrbCredPart.ticket_info.val = &krbCredInfo;
567 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
568 rdata.seq = authContext->local_seqnumber;
569 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
571 encKrbCredPart.nonce = NULL;
573 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
574 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
575 encKrbCredPart.timestamp = &rdata.timestamp;
576 encKrbCredPart.usec = &rdata.usec;
578 encKrbCredPart.timestamp = NULL;
579 encKrbCredPart.usec = NULL;
581 encKrbCredPart.s_address = authContext->local_address;
582 encKrbCredPart.r_address = authContext->remote_address;
584 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
585 encKrbCredPartData.length, &encKrbCredPart,
590 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
594 code = krb5_encrypt_EncryptedData(krbContext,
597 encKrbCredPartData.data,
598 encKrbCredPartData.length,
604 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
605 &krbCred, &len, code);
609 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
610 authContext->local_seqnumber++;
613 if (krbCrypto != NULL)
614 krb5_crypto_destroy(krbContext, krbCrypto);
615 free_KRB_CRED(&krbCred);
616 krb5_data_free(&encKrbCredPartData);
620 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
627 #endif /* HAVE_HEIMDAL_VERSION */