2 * Copyright (c) 2011, JANET(UK)
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17 * may be used to endorse or promote products derived from this software
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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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;
303 #ifdef HAVE_HEIMDAL_VERSION
304 static heim_general_string krbAnonymousPrincipalComponents[] =
305 { KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME };
307 static const Principal krbAnonymousPrincipalData = {
308 { KRB5_NT_WELLKNOWN, { 2, krbAnonymousPrincipalComponents } },
309 "WELLKNOWN:ANONYMOUS"
314 krbAnonymousPrincipal(void)
316 #ifdef HAVE_HEIMDAL_VERSION
317 return &krbAnonymousPrincipalData;
319 return krb5_anonymous_principal();
324 krbCryptoLength(krb5_context krbContext,
325 #ifdef HAVE_HEIMDAL_VERSION
326 krb5_crypto krbCrypto,
333 #ifdef HAVE_HEIMDAL_VERSION
334 return krb5_crypto_length(krbContext, krbCrypto, type, length);
337 krb5_error_code code;
339 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
341 *length = (size_t)len;
348 krbPaddingLength(krb5_context krbContext,
349 #ifdef HAVE_HEIMDAL_VERSION
350 krb5_crypto krbCrypto,
357 krb5_error_code code;
358 #ifdef HAVE_HEIMDAL_VERSION
359 size_t headerLength, paddingLength;
361 code = krbCryptoLength(krbContext, krbCrypto,
362 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
366 dataLength += headerLength;
368 code = krb5_crypto_length(krbContext, krbCrypto,
369 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
373 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
374 *padLength = paddingLength - (dataLength % paddingLength);
382 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
384 *padLength = (size_t)pad;
387 #endif /* HAVE_HEIMDAL_VERSION */
391 krbBlockSize(krb5_context krbContext,
392 #ifdef HAVE_HEIMDAL_VERSION
393 krb5_crypto krbCrypto,
399 #ifdef HAVE_HEIMDAL_VERSION
400 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
402 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
408 #ifdef HAVE_HEIMDAL_VERSION
409 krb5_context krbContext,
411 krb5_context krbContext GSSEAP_UNUSED,
413 krb5_enctype enctype,
417 krb5_error_code code;
418 #ifdef HAVE_HEIMDAL_VERSION
419 char *enctypeBuf = NULL;
421 char enctypeBuf[128];
423 size_t prefixLength, enctypeLength;
425 #ifdef HAVE_HEIMDAL_VERSION
426 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
428 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
433 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
434 enctypeLength = strlen(enctypeBuf);
436 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
437 if (string->value == NULL) {
438 #ifdef HAVE_HEIMDAL_VERSION
439 krb5_xfree(enctypeBuf);
444 if (prefixLength != 0)
445 memcpy(string->value, prefix, prefixLength);
446 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
448 string->length = prefixLength + enctypeLength;
449 ((char *)string->value)[string->length] = '\0';
451 #ifdef HAVE_HEIMDAL_VERSION
452 krb5_xfree(enctypeBuf);
459 krbMakeAuthDataKdcIssued(krb5_context context,
460 const krb5_keyblock *key,
461 krb5_const_principal issuer,
462 #ifdef HAVE_HEIMDAL_VERSION
463 const AuthorizationData *authdata,
464 AuthorizationData *adKdcIssued
466 krb5_authdata *const *authdata,
467 krb5_authdata ***adKdcIssued
471 #ifdef HAVE_HEIMDAL_VERSION
472 krb5_error_code code;
473 AD_KDCIssued kdcIssued;
474 AuthorizationDataElement adDatum;
476 size_t buf_size, len;
477 krb5_crypto crypto = NULL;
479 memset(&kdcIssued, 0, sizeof(kdcIssued));
480 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
482 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
483 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
484 kdcIssued.elements = *authdata;
486 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
490 code = krb5_crypto_init(context, key, 0, &crypto);
494 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
495 0, buf, buf_size, &kdcIssued.ad_checksum);
502 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
506 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
507 adDatum.ad_data.length = buf_size;
508 adDatum.ad_data.data = buf;
510 code = add_AuthorizationData(adKdcIssued, &adDatum);
518 krb5_crypto_destroy(context, crypto);
519 free_Checksum(&kdcIssued.ad_checksum);
523 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
525 #endif /* HAVE_HEIMDAL_VERSION */
529 krbMakeCred(krb5_context krbContext,
530 krb5_auth_context authContext,
534 krb5_error_code code;
535 #ifdef HAVE_HEIMDAL_VERSION
537 KrbCredInfo krbCredInfo;
538 EncKrbCredPart encKrbCredPart;
540 krb5_crypto krbCrypto = NULL;
541 krb5_data encKrbCredPartData;
542 krb5_replay_data rdata;
548 memset(data, 0, sizeof(*data));
549 #ifdef HAVE_HEIMDAL_VERSION
550 memset(&krbCred, 0, sizeof(krbCred));
551 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
552 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
553 memset(&rdata, 0, sizeof(rdata));
555 if (authContext->local_subkey)
556 key = authContext->local_subkey;
557 else if (authContext->remote_subkey)
558 key = authContext->remote_subkey;
560 key = authContext->keyblock;
563 krbCred.msg_type = krb_cred;
564 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
565 if (krbCred.tickets.val == NULL) {
569 krbCred.tickets.len = 1;
571 code = decode_Ticket(creds->ticket.data,
572 creds->ticket.length,
573 krbCred.tickets.val, &len);
577 krbCredInfo.key = creds->session;
578 krbCredInfo.prealm = &creds->client->realm;
579 krbCredInfo.pname = &creds->client->name;
580 krbCredInfo.flags = &creds->flags.b;
581 krbCredInfo.authtime = &creds->times.authtime;
582 krbCredInfo.starttime = &creds->times.starttime;
583 krbCredInfo.endtime = &creds->times.endtime;
584 krbCredInfo.renew_till = &creds->times.renew_till;
585 krbCredInfo.srealm = &creds->server->realm;
586 krbCredInfo.sname = &creds->server->name;
587 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
589 encKrbCredPart.ticket_info.len = 1;
590 encKrbCredPart.ticket_info.val = &krbCredInfo;
591 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
592 rdata.seq = authContext->local_seqnumber;
593 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
595 encKrbCredPart.nonce = NULL;
597 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
598 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
599 encKrbCredPart.timestamp = &rdata.timestamp;
600 encKrbCredPart.usec = &rdata.usec;
602 encKrbCredPart.timestamp = NULL;
603 encKrbCredPart.usec = NULL;
605 encKrbCredPart.s_address = authContext->local_address;
606 encKrbCredPart.r_address = authContext->remote_address;
608 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
609 encKrbCredPartData.length, &encKrbCredPart,
614 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
618 code = krb5_encrypt_EncryptedData(krbContext,
621 encKrbCredPartData.data,
622 encKrbCredPartData.length,
628 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
629 &krbCred, &len, code);
633 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
634 authContext->local_seqnumber++;
637 if (krbCrypto != NULL)
638 krb5_crypto_destroy(krbContext, krbCrypto);
639 free_KRB_CRED(&krbCred);
640 krb5_data_free(&encKrbCredPartData);
644 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
651 #endif /* HAVE_HEIMDAL_VERSION */