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
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14 * documentation and/or other materials provided with the distribution.
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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
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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)
114 gssEapDeriveRfc3961Key(OM_uint32 *minor,
115 const unsigned char *inputKey,
116 size_t inputKeyLength,
117 krb5_enctype encryptionType,
120 krb5_context krbContext;
121 #ifndef HAVE_HEIMDAL_VERSION
124 krb5_data ns, t, prfOut;
126 krb5_error_code code;
127 size_t randomLength, keyLength, prfLength;
128 unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
131 GSSEAP_ASSERT(encryptionType != ENCTYPE_NULL);
133 memset(pKey, 0, sizeof(*pKey));
135 GSSEAP_KRB_INIT(&krbContext);
138 KRB_KEY_TYPE(&kd) = encryptionType;
146 code = krb5_c_keylengths(krbContext, encryptionType,
147 &randomLength, &keyLength);
151 KRB_KEY_DATA(&kd) = GSSEAP_MALLOC(keyLength);
152 if (KRB_KEY_DATA(&kd) == NULL) {
156 KRB_KEY_LENGTH(&kd) = keyLength;
158 /* Convert MSK into a Kerberos key */
159 #ifdef HAVE_HEIMDAL_VERSION
160 code = krb5_random_to_key(krbContext, encryptionType, inputKey,
161 MIN(inputKeyLength, randomLength), &kd);
163 data.length = MIN(inputKeyLength, randomLength);
164 data.data = (char *)inputKey;
166 code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
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 t.length = prfLength;
183 t.data = GSSEAP_MALLOC(t.length);
184 if (t.data == NULL) {
189 prfOut.length = randomLength;
190 prfOut.data = GSSEAP_MALLOC(prfOut.length);
191 if (prfOut.data == NULL) {
196 for (i = 0, p = (unsigned char *)prfOut.data, remain = randomLength;
198 p += t.length, remain -= t.length, i++)
200 store_uint32_be(i, ns.data);
202 code = krb5_c_prf(krbContext, &kd, &ns, &t);
206 memcpy(p, t.data, MIN(t.length, remain));
209 /* Finally, convert PRF output into a new key which we will return */
210 #ifdef HAVE_HEIMDAL_VERSION
211 code = krb5_random_to_key(krbContext, encryptionType,
212 prfOut.data, prfOut.length, &kd);
214 code = krb5_c_random_to_key(krbContext, encryptionType, &prfOut, &kd);
220 KRB_KEY_DATA(&kd) = NULL;
223 if (KRB_KEY_DATA(&kd) != NULL) {
224 memset(KRB_KEY_DATA(&kd), 0, KRB_KEY_LENGTH(&kd));
225 GSSEAP_FREE(KRB_KEY_DATA(&kd));
227 if (t.data != NULL) {
228 memset(t.data, 0, t.length);
231 if (prfOut.data != NULL) {
232 memset(prfOut.data, 0, prfOut.length);
233 GSSEAP_FREE(prfOut.data);
236 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
239 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
240 extern krb5_error_code
241 krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
245 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
247 krb5_cksumtype *cksumtype)
249 krb5_context krbContext;
250 #ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
255 GSSEAP_KRB_INIT(&krbContext);
257 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
258 *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
261 return GSS_S_FAILURE;
266 memset(&cksum, 0, sizeof(cksum));
269 * This is a complete hack but it's the only way to work with
270 * MIT Kerberos pre-1.9 without using private API, as it does
271 * not support passing in zero as the checksum type.
273 *minor = krb5_c_make_checksum(krbContext, 0, key, 0, &data, &cksum);
275 return GSS_S_FAILURE;
277 #ifdef HAVE_HEIMDAL_VERSION
278 *cksumtype = cksum.cksumtype;
280 *cksumtype = cksum.checksum_type;
283 krb5_free_checksum_contents(krbContext, &cksum);
284 #endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
286 if (!krb5_c_is_keyed_cksum(*cksumtype)) {
287 *minor = (OM_uint32)KRB5KRB_AP_ERR_INAPP_CKSUM;
288 return GSS_S_FAILURE;
291 return GSS_S_COMPLETE;
295 krbCryptoLength(krb5_context krbContext,
296 #ifdef HAVE_HEIMDAL_VERSION
297 krb5_crypto krbCrypto,
304 #ifdef HAVE_HEIMDAL_VERSION
305 return krb5_crypto_length(krbContext, krbCrypto, type, length);
308 krb5_error_code code;
310 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
312 *length = (size_t)len;
319 krbPaddingLength(krb5_context krbContext,
320 #ifdef HAVE_HEIMDAL_VERSION
321 krb5_crypto krbCrypto,
328 krb5_error_code code;
329 #ifdef HAVE_HEIMDAL_VERSION
330 size_t headerLength, paddingLength;
332 code = krbCryptoLength(krbContext, krbCrypto,
333 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
337 dataLength += headerLength;
339 code = krb5_crypto_length(krbContext, krbCrypto,
340 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
344 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
345 *padLength = paddingLength - (dataLength % paddingLength);
353 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
355 *padLength = (size_t)pad;
358 #endif /* HAVE_HEIMDAL_VERSION */
362 krbBlockSize(krb5_context krbContext,
363 #ifdef HAVE_HEIMDAL_VERSION
364 krb5_crypto krbCrypto,
370 #ifdef HAVE_HEIMDAL_VERSION
371 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
373 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
379 #ifdef HAVE_HEIMDAL_VERSION
380 krb5_context krbContext,
382 krb5_context krbContext GSSEAP_UNUSED,
384 krb5_enctype enctype,
388 krb5_error_code code;
389 #ifdef HAVE_HEIMDAL_VERSION
390 char *enctypeBuf = NULL;
392 char enctypeBuf[128];
394 size_t prefixLength, enctypeLength;
396 #ifdef HAVE_HEIMDAL_VERSION
397 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
399 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
404 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
405 enctypeLength = strlen(enctypeBuf);
407 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
408 if (string->value == NULL) {
409 #ifdef HAVE_HEIMDAL_VERSION
410 krb5_xfree(enctypeBuf);
415 if (prefixLength != 0)
416 memcpy(string->value, prefix, prefixLength);
417 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
419 string->length = prefixLength + enctypeLength;
420 ((char *)string->value)[string->length] = '\0';
422 #ifdef HAVE_HEIMDAL_VERSION
423 krb5_xfree(enctypeBuf);
430 krbMakeAuthDataKdcIssued(krb5_context context,
431 const krb5_keyblock *key,
432 krb5_const_principal issuer,
433 #ifdef HAVE_HEIMDAL_VERSION
434 const AuthorizationData *authdata,
435 AuthorizationData *adKdcIssued
437 krb5_authdata *const *authdata,
438 krb5_authdata ***adKdcIssued
442 #ifdef HAVE_HEIMDAL_VERSION
443 krb5_error_code code;
444 AD_KDCIssued kdcIssued;
445 AuthorizationDataElement adDatum;
447 size_t buf_size, len;
448 krb5_crypto crypto = NULL;
450 memset(&kdcIssued, 0, sizeof(kdcIssued));
451 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
453 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
454 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
455 kdcIssued.elements = *authdata;
457 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
461 code = krb5_crypto_init(context, key, 0, &crypto);
465 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
466 0, buf, buf_size, &kdcIssued.ad_checksum);
470 free(buf); /* match ASN1_MALLOC_ENCODE */
473 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
477 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
478 adDatum.ad_data.length = buf_size;
479 adDatum.ad_data.data = buf;
481 code = add_AuthorizationData(adKdcIssued, &adDatum);
487 free(buf); /* match ASN1_MALLOC_ENCODE */
489 krb5_crypto_destroy(context, crypto);
490 free_Checksum(&kdcIssued.ad_checksum);
494 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
496 #endif /* HAVE_HEIMDAL_VERSION */
500 krbMakeCred(krb5_context krbContext,
501 krb5_auth_context authContext,
505 krb5_error_code code;
506 #ifdef HAVE_HEIMDAL_VERSION
508 KrbCredInfo krbCredInfo;
509 EncKrbCredPart encKrbCredPart;
511 krb5_crypto krbCrypto = NULL;
512 krb5_data encKrbCredPartData;
513 krb5_replay_data rdata;
519 memset(data, 0, sizeof(*data));
520 #ifdef HAVE_HEIMDAL_VERSION
521 memset(&krbCred, 0, sizeof(krbCred));
522 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
523 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
524 memset(&rdata, 0, sizeof(rdata));
526 if (authContext->local_subkey)
527 key = authContext->local_subkey;
528 else if (authContext->remote_subkey)
529 key = authContext->remote_subkey;
531 key = authContext->keyblock;
534 krbCred.msg_type = krb_cred;
535 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
536 if (krbCred.tickets.val == NULL) {
540 krbCred.tickets.len = 1;
542 code = decode_Ticket(creds->ticket.data,
543 creds->ticket.length,
544 krbCred.tickets.val, &len);
548 krbCredInfo.key = creds->session;
549 krbCredInfo.prealm = &creds->client->realm;
550 krbCredInfo.pname = &creds->client->name;
551 krbCredInfo.flags = &creds->flags.b;
552 krbCredInfo.authtime = &creds->times.authtime;
553 krbCredInfo.starttime = &creds->times.starttime;
554 krbCredInfo.endtime = &creds->times.endtime;
555 krbCredInfo.renew_till = &creds->times.renew_till;
556 krbCredInfo.srealm = &creds->server->realm;
557 krbCredInfo.sname = &creds->server->name;
558 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
560 encKrbCredPart.ticket_info.len = 1;
561 encKrbCredPart.ticket_info.val = &krbCredInfo;
562 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
563 rdata.seq = authContext->local_seqnumber;
564 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
566 encKrbCredPart.nonce = NULL;
568 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
569 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
570 encKrbCredPart.timestamp = &rdata.timestamp;
571 encKrbCredPart.usec = &rdata.usec;
573 encKrbCredPart.timestamp = NULL;
574 encKrbCredPart.usec = NULL;
576 encKrbCredPart.s_address = authContext->local_address;
577 encKrbCredPart.r_address = authContext->remote_address;
579 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
580 encKrbCredPartData.length, &encKrbCredPart,
585 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
589 code = krb5_encrypt_EncryptedData(krbContext,
592 encKrbCredPartData.data,
593 encKrbCredPartData.length,
599 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
600 &krbCred, &len, code);
604 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
605 authContext->local_seqnumber++;
608 if (krbCrypto != NULL)
609 krb5_crypto_destroy(krbContext, krbCrypto);
610 free_KRB_CRED(&krbCred);
611 krb5_data_free(&encKrbCredPartData);
615 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
622 #endif /* HAVE_HEIMDAL_VERSION */