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"
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 if (code != 0 && krbContext != NULL)
72 krb5_free_context(krbContext);
74 if (defaultRealm != NULL)
75 GSSEAP_FREE(defaultRealm);
81 gssEapKerberosInit(OM_uint32 *minor, krb5_context *context)
83 struct gss_eap_thread_local_data *tld;
87 tld = gssEapGetThreadLocalData();
89 *context = tld->krbContext;
90 if (*context == NULL) {
91 *minor = initKrbContext(context);
93 tld->krbContext = *context;
97 return *minor == 0 ? GSS_S_COMPLETE : GSS_S_FAILURE;
101 * Derive a key K for RFC 4121 use by using the following
102 * derivation function (based on RFC 4402);
104 * KMSK = random-to-key(MSK)
105 * Tn = pseudo-random(KMSK, n || "rfc4121-gss-eap")
106 * L = output key size
107 * K = truncate(L, T1 || T2 || .. || Tn)
110 gssEapDeriveRfc3961Key(OM_uint32 *minor,
111 const unsigned char *inputKey,
112 size_t inputKeyLength,
113 krb5_enctype encryptionType,
116 krb5_context krbContext;
117 #ifndef HAVE_HEIMDAL_VERSION
120 krb5_data ns, t, prfOut;
122 krb5_error_code code;
123 size_t randomLength, keyLength, prfLength;
124 unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
127 assert(encryptionType != ENCTYPE_NULL);
129 memset(pKey, 0, sizeof(*pKey));
131 GSSEAP_KRB_INIT(&krbContext);
134 KRB_KEY_TYPE(&kd) = encryptionType;
142 code = krb5_c_keylengths(krbContext, encryptionType,
143 &randomLength, &keyLength);
147 KRB_KEY_DATA(&kd) = GSSEAP_MALLOC(keyLength);
148 if (KRB_KEY_DATA(&kd) == NULL) {
152 KRB_KEY_LENGTH(&kd) = keyLength;
154 /* Convert MSK into a Kerberos key */
155 #ifdef HAVE_HEIMDAL_VERSION
156 code = krb5_random_to_key(krbContext, encryptionType, inputKey,
157 MIN(inputKeyLength, randomLength), &kd);
159 data.length = MIN(inputKeyLength, randomLength);
160 data.data = (char *)inputKey;
162 code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
167 memset(&constant[0], 0, 4);
168 memcpy(&constant[4], "rfc4121-gss-eap", sizeof("rfc4121-gss-eap") - 1);
170 ns.length = sizeof(constant);
171 ns.data = (char *)constant;
173 /* Plug derivation constant and key into PRF */
174 code = krb5_c_prf_length(krbContext, encryptionType, &prfLength);
178 t.length = prfLength;
179 t.data = GSSEAP_MALLOC(t.length);
180 if (t.data == NULL) {
185 prfOut.length = randomLength;
186 prfOut.data = GSSEAP_MALLOC(prfOut.length);
187 if (prfOut.data == NULL) {
192 for (i = 0, p = (unsigned char *)prfOut.data, remain = randomLength;
194 p += t.length, remain -= t.length, i++)
196 store_uint32_be(i, ns.data);
198 code = krb5_c_prf(krbContext, &kd, &ns, &t);
202 memcpy(p, t.data, MIN(t.length, remain));
205 /* Finally, convert PRF output into a new key which we will return */
206 #ifdef HAVE_HEIMDAL_VERSION
207 code = krb5_random_to_key(krbContext, encryptionType,
208 prfOut.data, prfOut.length, &kd);
210 code = krb5_c_random_to_key(krbContext, encryptionType, &prfOut, &kd);
216 KRB_KEY_DATA(&kd) = NULL;
219 if (KRB_KEY_DATA(&kd) != NULL) {
220 memset(KRB_KEY_DATA(&kd), 0, KRB_KEY_LENGTH(&kd));
221 GSSEAP_FREE(KRB_KEY_DATA(&kd));
223 if (t.data != NULL) {
224 memset(t.data, 0, t.length);
227 if (prfOut.data != NULL) {
228 memset(prfOut.data, 0, prfOut.length);
229 GSSEAP_FREE(prfOut.data);
232 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
235 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
236 extern krb5_error_code
237 krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
241 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
243 krb5_cksumtype *cksumtype)
245 krb5_context krbContext;
246 #ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
251 GSSEAP_KRB_INIT(&krbContext);
253 #ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
254 *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
257 return GSS_S_FAILURE;
262 memset(&cksum, 0, sizeof(cksum));
265 * This is a complete hack but it's the only way to work with
266 * MIT Kerberos pre-1.9 without using private API, as it does
267 * not support passing in zero as the checksum type.
269 *minor = krb5_c_make_checksum(krbContext, 0, key, 0, &data, &cksum);
271 return GSS_S_FAILURE;
273 #ifdef HAVE_HEIMDAL_VERSION
274 *cksumtype = cksum.cksumtype;
276 *cksumtype = cksum.checksum_type;
279 krb5_free_checksum_contents(krbContext, &cksum);
280 #endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
282 if (!krb5_c_is_keyed_cksum(*cksumtype)) {
283 *minor = KRB5KRB_AP_ERR_INAPP_CKSUM;
284 return GSS_S_FAILURE;
287 return GSS_S_COMPLETE;
291 krbCryptoLength(krb5_context krbContext,
292 #ifdef HAVE_HEIMDAL_VERSION
293 krb5_crypto krbCrypto,
300 #ifdef HAVE_HEIMDAL_VERSION
301 return krb5_crypto_length(krbContext, krbCrypto, type, length);
304 krb5_error_code code;
306 code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
308 *length = (size_t)len;
315 krbPaddingLength(krb5_context krbContext,
316 #ifdef HAVE_HEIMDAL_VERSION
317 krb5_crypto krbCrypto,
324 krb5_error_code code;
325 #ifdef HAVE_HEIMDAL_VERSION
326 size_t headerLength, paddingLength;
328 code = krbCryptoLength(krbContext, krbCrypto,
329 KRB5_CRYPTO_TYPE_HEADER, &headerLength);
333 dataLength += headerLength;
335 code = krb5_crypto_length(krbContext, krbCrypto,
336 KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
340 if (paddingLength != 0 && (dataLength % paddingLength) != 0)
341 *padLength = paddingLength - (dataLength % paddingLength);
349 code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
351 *padLength = (size_t)pad;
354 #endif /* HAVE_HEIMDAL_VERSION */
358 krbBlockSize(krb5_context krbContext,
359 #ifdef HAVE_HEIMDAL_VERSION
360 krb5_crypto krbCrypto,
366 #ifdef HAVE_HEIMDAL_VERSION
367 return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
369 return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
375 #ifdef HAVE_HEIMDAL_VERSION
376 krb5_context krbContext,
378 krb5_context krbContext GSSEAP_UNUSED,
380 krb5_enctype enctype,
384 krb5_error_code code;
385 #ifdef HAVE_HEIMDAL_VERSION
386 char *enctypeBuf = NULL;
388 char enctypeBuf[128];
390 size_t prefixLength, enctypeLength;
392 #ifdef HAVE_HEIMDAL_VERSION
393 code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
395 code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
400 prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
401 enctypeLength = strlen(enctypeBuf);
403 string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
404 if (string->value == NULL) {
405 #ifdef HAVE_HEIMDAL_VERSION
406 krb5_xfree(enctypeBuf);
411 if (prefixLength != 0)
412 memcpy(string->value, prefix, prefixLength);
413 memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
415 string->length = prefixLength + enctypeLength;
416 ((char *)string->value)[string->length] = '\0';
418 #ifdef HAVE_HEIMDAL_VERSION
419 krb5_xfree(enctypeBuf);
426 krbMakeAuthDataKdcIssued(krb5_context context,
427 const krb5_keyblock *key,
428 krb5_const_principal issuer,
429 #ifdef HAVE_HEIMDAL_VERSION
430 const AuthorizationData *authdata,
431 AuthorizationData *adKdcIssued
433 krb5_authdata *const *authdata,
434 krb5_authdata ***adKdcIssued
438 #ifdef HAVE_HEIMDAL_VERSION
439 krb5_error_code code;
440 AD_KDCIssued kdcIssued;
441 AuthorizationDataElement adDatum;
443 size_t buf_size, len;
444 krb5_crypto crypto = NULL;
446 memset(&kdcIssued, 0, sizeof(kdcIssued));
447 memset(adKdcIssued, 0, sizeof(*adKdcIssued));
449 kdcIssued.i_realm = issuer->realm != NULL ? (Realm *)&issuer->realm : NULL;
450 kdcIssued.i_sname = (PrincipalName *)&issuer->name;
451 kdcIssued.elements = *authdata;
453 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, &len, code);
457 code = krb5_crypto_init(context, key, 0, &crypto);
461 code = krb5_create_checksum(context, crypto, KRB5_KU_AD_KDC_ISSUED,
462 0, buf, buf_size, &kdcIssued.ad_checksum);
469 ASN1_MALLOC_ENCODE(AD_KDCIssued, buf, buf_size, &kdcIssued, &len, code);
473 adDatum.ad_type = KRB5_AUTHDATA_KDC_ISSUED;
474 adDatum.ad_data.length = buf_size;
475 adDatum.ad_data.data = buf;
477 code = add_AuthorizationData(adKdcIssued, &adDatum);
485 krb5_crypto_destroy(context, crypto);
486 free_Checksum(&kdcIssued.ad_checksum);
490 return krb5_make_authdata_kdc_issued(context, key, issuer, authdata,
492 #endif /* HAVE_HEIMDAL_VERSION */
496 krbMakeCred(krb5_context krbContext,
497 krb5_auth_context authContext,
501 krb5_error_code code;
502 #ifdef HAVE_HEIMDAL_VERSION
504 KrbCredInfo krbCredInfo;
505 EncKrbCredPart encKrbCredPart;
507 krb5_crypto krbCrypto = NULL;
508 krb5_data encKrbCredPartData;
509 krb5_replay_data rdata;
515 memset(data, 0, sizeof(*data));
516 #ifdef HAVE_HEIMDAL_VERSION
517 memset(&krbCred, 0, sizeof(krbCred));
518 memset(&krbCredInfo, 0, sizeof(krbCredInfo));
519 memset(&encKrbCredPart, 0, sizeof(encKrbCredPart));
520 memset(&rdata, 0, sizeof(rdata));
522 if (authContext->local_subkey)
523 key = authContext->local_subkey;
524 else if (authContext->remote_subkey)
525 key = authContext->remote_subkey;
527 key = authContext->keyblock;
530 krbCred.msg_type = krb_cred;
531 krbCred.tickets.val = (Ticket *)GSSEAP_CALLOC(1, sizeof(Ticket));
532 if (krbCred.tickets.val == NULL) {
536 krbCred.tickets.len = 1;
538 code = decode_Ticket(creds->ticket.data,
539 creds->ticket.length,
540 krbCred.tickets.val, &len);
544 krbCredInfo.key = creds->session;
545 krbCredInfo.prealm = &creds->client->realm;
546 krbCredInfo.pname = &creds->client->name;
547 krbCredInfo.flags = &creds->flags.b;
548 krbCredInfo.authtime = &creds->times.authtime;
549 krbCredInfo.starttime = &creds->times.starttime;
550 krbCredInfo.endtime = &creds->times.endtime;
551 krbCredInfo.renew_till = &creds->times.renew_till;
552 krbCredInfo.srealm = &creds->server->realm;
553 krbCredInfo.sname = &creds->server->name;
554 krbCredInfo.caddr = creds->addresses.len ? &creds->addresses : NULL;
556 encKrbCredPart.ticket_info.len = 1;
557 encKrbCredPart.ticket_info.val = &krbCredInfo;
558 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
559 rdata.seq = authContext->local_seqnumber;
560 encKrbCredPart.nonce = (int32_t *)&rdata.seq;
562 encKrbCredPart.nonce = NULL;
564 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
565 krb5_us_timeofday(krbContext, &rdata.timestamp, &rdata.usec);
566 encKrbCredPart.timestamp = &rdata.timestamp;
567 encKrbCredPart.usec = &rdata.usec;
569 encKrbCredPart.timestamp = NULL;
570 encKrbCredPart.usec = NULL;
572 encKrbCredPart.s_address = authContext->local_address;
573 encKrbCredPart.r_address = authContext->remote_address;
575 ASN1_MALLOC_ENCODE(EncKrbCredPart, encKrbCredPartData.data,
576 encKrbCredPartData.length, &encKrbCredPart,
581 code = krb5_crypto_init(krbContext, key, 0, &krbCrypto);
585 code = krb5_encrypt_EncryptedData(krbContext,
588 encKrbCredPartData.data,
589 encKrbCredPartData.length,
595 ASN1_MALLOC_ENCODE(KRB_CRED, data->data, data->length,
596 &krbCred, &len, code);
600 if (authContext->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
601 authContext->local_seqnumber++;
604 if (krbCrypto != NULL)
605 krb5_crypto_destroy(krbContext, krbCrypto);
606 free_KRB_CRED(&krbCred);
607 krb5_data_free(&encKrbCredPartData);
611 code = krb5_mk_1cred(krbContext, authContext, creds, &d, NULL);
618 #endif /* HAVE_HEIMDAL_VERSION */