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;
86 tld = gssEapGetThreadLocalData();
88 *context = tld->krbContext;
89 if (*context == NULL) {
90 *minor = initKrbContext(context);
92 tld->krbContext = *context;
95 return *minor == 0 ? GSS_S_COMPLETE : GSS_S_FAILURE;
99 * Derive a key K for RFC 4121 use by using the following
100 * derivation function (based on RFC 4402);
102 * KMSK = random-to-key(MSK)
103 * Tn = pseudo-random(KMSK, n || "rfc4121-gss-eap")
104 * L = output key size
105 * K = truncate(L, T1 || T2 || .. || Tn)
108 gssEapDeriveRfc3961Key(OM_uint32 *minor,
109 const unsigned char *inputKey,
110 size_t inputKeyLength,
111 krb5_enctype encryptionType,
114 krb5_context krbContext;
115 #ifndef HAVE_HEIMDAL_VERSION
118 krb5_data ns, t, prfOut;
120 krb5_error_code code;
121 size_t randomLength, keyLength, prfLength;
122 unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
125 GSSEAP_ASSERT(encryptionType != ENCTYPE_NULL);
127 memset(pKey, 0, sizeof(*pKey));
129 GSSEAP_KRB_INIT(&krbContext);
132 KRB_KEY_TYPE(&kd) = encryptionType;
140 code = krb5_c_keylengths(krbContext, encryptionType,
141 &randomLength, &keyLength);
145 KRB_KEY_DATA(&kd) = GSSEAP_MALLOC(keyLength);
146 if (KRB_KEY_DATA(&kd) == NULL) {
150 KRB_KEY_LENGTH(&kd) = keyLength;
152 /* Convert MSK into a Kerberos key */
153 #ifdef HAVE_HEIMDAL_VERSION
154 code = krb5_random_to_key(krbContext, encryptionType, inputKey,
155 MIN(inputKeyLength, randomLength), &kd);
157 data.length = MIN(inputKeyLength, randomLength);
158 data.data = (char *)inputKey;
160 code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
165 memset(&constant[0], 0, 4);
166 memcpy(&constant[4], "rfc4121-gss-eap", sizeof("rfc4121-gss-eap") - 1);
168 ns.length = sizeof(constant);
169 ns.data = (char *)constant;
171 /* Plug derivation constant and key into PRF */
172 code = krb5_c_prf_length(krbContext, encryptionType, &prfLength);
176 t.length = prfLength;
177 t.data = GSSEAP_MALLOC(t.length);
178 if (t.data == NULL) {
183 prfOut.length = randomLength;
184 prfOut.data = GSSEAP_MALLOC(prfOut.length);
185 if (prfOut.data == NULL) {
190 for (i = 0, p = (unsigned char *)prfOut.data, remain = randomLength;
192 p += t.length, remain -= t.length, i++)
194 store_uint32_be(i, ns.data);
196 code = krb5_c_prf(krbContext, &kd, &ns, &t);
200 memcpy(p, t.data, MIN(t.length, remain));
203 /* Finally, convert PRF output into a new key which we will return */
204 #ifdef HAVE_HEIMDAL_VERSION
205 code = krb5_random_to_key(krbContext, encryptionType,
206 prfOut.data, prfOut.length, &kd);
208 code = krb5_c_random_to_key(krbContext, encryptionType, &prfOut, &kd);
214 KRB_KEY_DATA(&kd) = NULL;
217 if (KRB_KEY_DATA(&kd) != NULL) {
218 memset(KRB_KEY_DATA(&kd), 0, KRB_KEY_LENGTH(&kd));
219 GSSEAP_FREE(KRB_KEY_DATA(&kd));
221 if (t.data != NULL) {
222 memset(t.data, 0, t.length);
225 if (prfOut.data != NULL) {
226 memset(prfOut.data, 0, prfOut.length);
227 GSSEAP_FREE(prfOut.data);
230 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
233 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
234 extern krb5_error_code
235 krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
239 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
241 krb5_cksumtype *cksumtype)
243 krb5_context krbContext;
244 #ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
249 GSSEAP_KRB_INIT(&krbContext);
251 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
252 *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
255 return GSS_S_FAILURE;
260 memset(&cksum, 0, sizeof(cksum));
263 * This is a complete hack but it's the only way to work with
264 * MIT Kerberos pre-1.9 without using private API, as it does
265 * not support passing in zero as the checksum type.
267 *minor = krb5_c_make_checksum(krbContext, 0, key, 0, &data, &cksum);
269 return GSS_S_FAILURE;
271 #ifdef HAVE_HEIMDAL_VERSION
272 *cksumtype = cksum.cksumtype;
274 *cksumtype = cksum.checksum_type;
277 krb5_free_checksum_contents(krbContext, &cksum);
278 #endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
280 if (!krb5_c_is_keyed_cksum(*cksumtype)) {
281 *minor = (OM_uint32)KRB5KRB_AP_ERR_INAPP_CKSUM;
282 return GSS_S_FAILURE;
285 return GSS_S_COMPLETE;
289 krbCryptoLength(krb5_context krbContext,
290 #ifdef HAVE_HEIMDAL_VERSION
291 krb5_crypto krbCrypto,
298 #ifdef HAVE_HEIMDAL_VERSION
299 return krb5_crypto_length(krbContext, krbCrypto, type, length);
302 krb5_error_code code;
304 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
306 *length = (size_t)len;
313 krbPaddingLength(krb5_context krbContext,
314 #ifdef HAVE_HEIMDAL_VERSION
315 krb5_crypto krbCrypto,
322 krb5_error_code code;
323 #ifdef HAVE_HEIMDAL_VERSION
324 size_t headerLength, paddingLength;
326 code = krbCryptoLength(krbContext, krbCrypto,
327 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
331 dataLength += headerLength;
333 code = krb5_crypto_length(krbContext, krbCrypto,
334 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
338 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
339 *padLength = paddingLength - (dataLength % paddingLength);
347 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
349 *padLength = (size_t)pad;
352 #endif /* HAVE_HEIMDAL_VERSION */
356 krbBlockSize(krb5_context krbContext,
357 #ifdef HAVE_HEIMDAL_VERSION
358 krb5_crypto krbCrypto,
364 #ifdef HAVE_HEIMDAL_VERSION
365 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
367 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
373 #ifdef HAVE_HEIMDAL_VERSION
374 krb5_context krbContext,
376 krb5_context krbContext GSSEAP_UNUSED,
378 krb5_enctype enctype,
382 krb5_error_code code;
383 #ifdef HAVE_HEIMDAL_VERSION
384 char *enctypeBuf = NULL;
386 char enctypeBuf[128];
388 size_t prefixLength, enctypeLength;
390 #ifdef HAVE_HEIMDAL_VERSION
391 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
393 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
398 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
399 enctypeLength = strlen(enctypeBuf);
401 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
402 if (string->value == NULL) {
403 #ifdef HAVE_HEIMDAL_VERSION
404 krb5_xfree(enctypeBuf);
409 if (prefixLength != 0)
410 memcpy(string->value, prefix, prefixLength);
411 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
413 string->length = prefixLength + enctypeLength;
414 ((char *)string->value)[string->length] = '\0';
416 #ifdef HAVE_HEIMDAL_VERSION
417 krb5_xfree(enctypeBuf);
424 krbMakeAuthDataKdcIssued(krb5_context context,
425 const krb5_keyblock *key,
426 krb5_const_principal issuer,
427 #ifdef HAVE_HEIMDAL_VERSION
428 const AuthorizationData *authdata,
429 AuthorizationData *adKdcIssued
431 krb5_authdata *const *authdata,
432 krb5_authdata ***adKdcIssued
436 #ifdef HAVE_HEIMDAL_VERSION
437 krb5_error_code code;
438 AD_KDCIssued kdcIssued;
439 AuthorizationDataElement adDatum;
441 size_t buf_size, len;
442 krb5_crypto crypto = NULL;
444 memset(&kdcIssued, 0, sizeof(kdcIssued));
445 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
447 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
448 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
449 kdcIssued.elements = *authdata;
451 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
455 code = krb5_crypto_init(context, key, 0, &crypto);
459 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
460 0, buf, buf_size, &kdcIssued.ad_checksum);
464 free(buf); /* match ASN1_MALLOC_ENCODE */
467 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
471 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
472 adDatum.ad_data.length = buf_size;
473 adDatum.ad_data.data = buf;
475 code = add_AuthorizationData(adKdcIssued, &adDatum);
481 free(buf); /* match ASN1_MALLOC_ENCODE */
483 krb5_crypto_destroy(context, crypto);
484 free_Checksum(&kdcIssued.ad_checksum);
488 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
490 #endif /* HAVE_HEIMDAL_VERSION */
494 krbMakeCred(krb5_context krbContext,
495 krb5_auth_context authContext,
499 krb5_error_code code;
500 #ifdef HAVE_HEIMDAL_VERSION
502 KrbCredInfo krbCredInfo;
503 EncKrbCredPart encKrbCredPart;
505 krb5_crypto krbCrypto = NULL;
506 krb5_data encKrbCredPartData;
507 krb5_replay_data rdata;
513 memset(data, 0, sizeof(*data));
514 #ifdef HAVE_HEIMDAL_VERSION
515 memset(&krbCred, 0, sizeof(krbCred));
516 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
517 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
518 memset(&rdata, 0, sizeof(rdata));
520 if (authContext->local_subkey)
521 key = authContext->local_subkey;
522 else if (authContext->remote_subkey)
523 key = authContext->remote_subkey;
525 key = authContext->keyblock;
528 krbCred.msg_type = krb_cred;
529 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
530 if (krbCred.tickets.val == NULL) {
534 krbCred.tickets.len = 1;
536 code = decode_Ticket(creds->ticket.data,
537 creds->ticket.length,
538 krbCred.tickets.val, &len);
542 krbCredInfo.key = creds->session;
543 krbCredInfo.prealm = &creds->client->realm;
544 krbCredInfo.pname = &creds->client->name;
545 krbCredInfo.flags = &creds->flags.b;
546 krbCredInfo.authtime = &creds->times.authtime;
547 krbCredInfo.starttime = &creds->times.starttime;
548 krbCredInfo.endtime = &creds->times.endtime;
549 krbCredInfo.renew_till = &creds->times.renew_till;
550 krbCredInfo.srealm = &creds->server->realm;
551 krbCredInfo.sname = &creds->server->name;
552 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
554 encKrbCredPart.ticket_info.len = 1;
555 encKrbCredPart.ticket_info.val = &krbCredInfo;
556 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
557 rdata.seq = authContext->local_seqnumber;
558 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
560 encKrbCredPart.nonce = NULL;
562 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
563 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
564 encKrbCredPart.timestamp = &rdata.timestamp;
565 encKrbCredPart.usec = &rdata.usec;
567 encKrbCredPart.timestamp = NULL;
568 encKrbCredPart.usec = NULL;
570 encKrbCredPart.s_address = authContext->local_address;
571 encKrbCredPart.r_address = authContext->remote_address;
573 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
574 encKrbCredPartData.length, &encKrbCredPart,
579 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
583 code = krb5_encrypt_EncryptedData(krbContext,
586 encKrbCredPartData.data,
587 encKrbCredPartData.length,
593 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
594 &krbCred, &len, code);
598 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
599 authContext->local_seqnumber++;
602 if (krbCrypto != NULL)
603 krb5_crypto_destroy(krbContext, krbCrypto);
604 free_KRB_CRED(&krbCred);
605 krb5_data_free(&encKrbCredPartData);
609 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
616 #endif /* HAVE_HEIMDAL_VERSION */