* SUCH DAMAGE.
*/
+/*
+ * Kerberos 5 helpers.
+ */
+
#include "gssapiP_eap.h"
static GSSEAP_THREAD_ONCE krbContextKeyOnce = GSSEAP_ONCE_INITIALIZER;
return *minor == 0 ? GSS_S_COMPLETE : GSS_S_FAILURE;
}
+
+/*
+ * Derive a key K for RFC 4121 use by using the following
+ * derivation function (based on RFC 4402);
+ *
+ * KMSK = random-to-key(MSK)
+ * Tn = pseudo-random(KMSK, n || "rfc4121-gss-eap")
+ * L = output key size
+ * K = truncate(L, T1 || T2 || .. || Tn)
+ */
+OM_uint32
+gssEapDeriveRfc3961Key(OM_uint32 *minor,
+ const unsigned char *inputKey,
+ size_t inputKeyLength,
+ krb5_enctype encryptionType,
+ krb5_keyblock *pKey)
+{
+ krb5_context krbContext;
+#ifndef HAVE_HEIMDAL_VERSION
+ krb5_data data;
+#endif
+ krb5_data ns, t, prfOut;
+ krb5_keyblock kd;
+ krb5_error_code code;
+ size_t randomLength, keyLength, prfLength;
+ unsigned char constant[4 + sizeof("rfc4121-gss-eap") - 1], *p;
+ ssize_t i, remain;
+
+ assert(encryptionType != ENCTYPE_NULL);
+
+ memset(pKey, 0, sizeof(*pKey));
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+ KRB_KEY_INIT(&kd);
+ KRB_KEY_TYPE(&kd) = encryptionType;
+
+ t.data = NULL;
+ t.length = 0;
+
+ prfOut.data = NULL;
+ prfOut.length = 0;
+
+ code = krb5_c_keylengths(krbContext, encryptionType,
+ &randomLength, &keyLength);
+ if (code != 0)
+ goto cleanup;
+
+ KRB_KEY_DATA(&kd) = GSSEAP_MALLOC(keyLength);
+ if (KRB_KEY_DATA(&kd) == NULL) {
+ code = ENOMEM;
+ goto cleanup;
+ }
+ KRB_KEY_LENGTH(&kd) = keyLength;
+
+ /* Convert MSK into a Kerberos key */
+#ifdef HAVE_HEIMDAL_VERSION
+ code = krb5_random_to_key(krbContext, encryptionType, inputKey,
+ MIN(inputKeyLength, randomLength), &kd);
+#else
+ data.length = MIN(inputKeyLength, randomLength);
+ data.data = (char *)inputKey;
+
+ code = krb5_c_random_to_key(krbContext, encryptionType, &data, &kd);
+#endif
+ if (code != 0)
+ goto cleanup;
+
+ memset(&constant[0], 0, 4);
+ memcpy(&constant[4], "rfc4121-gss-eap", sizeof("rfc4121-gss-eap") - 1);
+
+ ns.length = sizeof(constant);
+ ns.data = (char *)constant;
+
+ /* Plug derivation constant and key into PRF */
+ code = krb5_c_prf_length(krbContext, encryptionType, &prfLength);
+ if (code != 0)
+ goto cleanup;
+
+ t.length = prfLength;
+ t.data = GSSEAP_MALLOC(t.length);
+ if (t.data == NULL) {
+ code = ENOMEM;
+ goto cleanup;
+ }
+
+ prfOut.length = randomLength;
+ prfOut.data = GSSEAP_MALLOC(prfOut.length);
+ if (prfOut.data == NULL) {
+ code = ENOMEM;
+ goto cleanup;
+ }
+
+ for (i = 0, p = (unsigned char *)prfOut.data, remain = randomLength;
+ remain > 0;
+ p += t.length, remain -= t.length, i++)
+ {
+ store_uint32_be(i, ns.data);
+
+ code = krb5_c_prf(krbContext, &kd, &ns, &t);
+ if (code != 0)
+ goto cleanup;
+
+ memcpy(p, t.data, MIN(t.length, remain));
+ }
+
+ /* Finally, convert PRF output into a new key which we will return */
+#ifdef HAVE_HEIMDAL_VERSION
+ code = krb5_random_to_key(krbContext, encryptionType,
+ prfOut.data, prfOut.length, &kd);
+#else
+ code = krb5_c_random_to_key(krbContext, encryptionType, &prfOut, &kd);
+#endif
+ if (code != 0)
+ goto cleanup;
+
+ *pKey = kd;
+ KRB_KEY_DATA(&kd) = NULL;
+
+cleanup:
+ if (KRB_KEY_DATA(&kd) != NULL) {
+ memset(KRB_KEY_DATA(&kd), 0, KRB_KEY_LENGTH(&kd));
+ GSSEAP_FREE(KRB_KEY_DATA(&kd));
+ }
+ if (t.data != NULL) {
+ memset(t.data, 0, t.length);
+ GSSEAP_FREE(t.data);
+ }
+ if (prfOut.data != NULL) {
+ memset(prfOut.data, 0, prfOut.length);
+ GSSEAP_FREE(prfOut.data);
+ }
+ *minor = code;
+ return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
+}
+
+#ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
+extern krb5_error_code
+krb5int_c_mandatory_cksumtype(krb5_context, krb5_enctype, krb5_cksumtype *);
+#endif
+
+OM_uint32
+rfc3961ChecksumTypeForKey(OM_uint32 *minor,
+ krb5_keyblock *key,
+ krb5_cksumtype *cksumtype)
+{
+ krb5_context krbContext;
+#ifndef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
+ krb5_data data;
+ krb5_checksum cksum;
+#endif
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+#ifdef HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE
+ *minor = krb5int_c_mandatory_cksumtype(krbContext, KRB_KEY_TYPE(key),
+ cksumtype);
+ if (*minor != 0)
+ return GSS_S_FAILURE;
+#else
+ data.length = 0;
+ data.data = NULL;
+
+ memset(&cksum, 0, sizeof(cksum));
+
+ /*
+ * This is a complete hack but it's the only way to work with
+ * MIT Kerberos pre-1.9 without using private API, as it does
+ * not support passing in zero as the checksum type.
+ */
+ *minor = krb5_c_make_checksum(krbContext, 0, key, 0, &data, &cksum);
+ if (*minor != 0)
+ return GSS_S_FAILURE;
+
+#ifdef HAVE_HEIMDAL_VERSION
+ *cksumtype = cksum.cksumtype;
+#else
+ *cksumtype = cksum.checksum_type;
+#endif
+
+ krb5_free_checksum_contents(krbContext, &cksum);
+#endif /* HAVE_KRB5INT_C_MANDATORY_CKSUMTYPE */
+
+ if (!krb5_c_is_keyed_cksum(*cksumtype)) {
+ *minor = KRB5KRB_AP_ERR_INAPP_CKSUM;
+ return GSS_S_FAILURE;
+ }
+
+ return GSS_S_COMPLETE;
+}
+
+#ifdef HAVE_HEIMDAL_VERSION
+static heim_general_string krbAnonymousPrincipalComponents[] =
+ { KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME };
+
+static const Principal krbAnonymousPrincipalData = {
+ { KRB5_NT_WELLKNOWN, { 2, krbAnonymousPrincipalComponents } },
+ "WELLKNOWN:ANONYMOUS"
+};
+#endif
+
+krb5_const_principal
+krbAnonymousPrincipal(void)
+{
+#ifdef HAVE_HEIMDAL_VERSION
+ return &krbAnonymousPrincipalData;
+#else
+ return krb5_anonymous_principal();
+#endif
+}
+
+krb5_error_code
+krbCryptoLength(krb5_context krbContext,
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_crypto krbCrypto,
+#else
+ krb5_keyblock *key,
+#endif
+ int type,
+ size_t *length)
+{
+#ifdef HAVE_HEIMDAL_VERSION
+ return krb5_crypto_length(krbContext, krbCrypto, type, length);
+#else
+ unsigned int len;
+ krb5_error_code code;
+
+ code = krb5_c_crypto_length(krbContext, KRB_KEY_TYPE(key), type, &len);
+ if (code == 0)
+ *length = (size_t)len;
+
+ return code;
+#endif
+}
+
+krb5_error_code
+krbPaddingLength(krb5_context krbContext,
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_crypto krbCrypto,
+#else
+ krb5_keyblock *key,
+#endif
+ size_t dataLength,
+ size_t *padLength)
+{
+ krb5_error_code code;
+#ifdef HAVE_HEIMDAL_VERSION
+ size_t headerLength, paddingLength;
+
+ code = krbCryptoLength(krbContext, krbCrypto,
+ KRB5_CRYPTO_TYPE_HEADER, &headerLength);
+ if (code != 0)
+ return code;
+
+ dataLength += headerLength;
+
+ code = krb5_crypto_length(krbContext, krbCrypto,
+ KRB5_CRYPTO_TYPE_PADDING, &paddingLength);
+ if (code != 0)
+ return code;
+
+ if (paddingLength != 0 && (dataLength % paddingLength) != 0)
+ *padLength = paddingLength - (dataLength % paddingLength);
+ else
+ *padLength = 0;
+
+ return 0;
+#else
+ unsigned int pad;
+
+ code = krb5_c_padding_length(krbContext, KRB_KEY_TYPE(key), dataLength, &pad);
+ if (code == 0)
+ *padLength = (size_t)pad;
+
+ return code;
+#endif /* HAVE_HEIMDAL_VERSION */
+}
+
+krb5_error_code
+krbBlockSize(krb5_context krbContext,
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_crypto krbCrypto,
+#else
+ krb5_keyblock *key,
+#endif
+ size_t *blockSize)
+{
+#ifdef HAVE_HEIMDAL_VERSION
+ return krb5_crypto_getblocksize(krbContext, krbCrypto, blockSize);
+#else
+ return krb5_c_block_size(krbContext, KRB_KEY_TYPE(key), blockSize);
+#endif
+}
+
+krb5_error_code
+krbEnctypeToString(krb5_context krbContext,
+ krb5_enctype enctype,
+ const char *prefix,
+ gss_buffer_t string)
+{
+ krb5_error_code code;
+#ifdef HAVE_HEIMDAL_VERSION
+ char *enctypeBuf = NULL;
+#else
+ char enctypeBuf[128];
+#endif
+ size_t prefixLength, enctypeLength;
+
+#ifdef HAVE_HEIMDAL_VERSION
+ code = krb5_enctype_to_string(krbContext, enctype, &enctypeBuf);
+#else
+ code = krb5_enctype_to_name(enctype, 0, enctypeBuf, sizeof(enctypeBuf));
+#endif
+ if (code != 0)
+ return code;
+
+ prefixLength = (prefix != NULL) ? strlen(prefix) : 0;
+ enctypeLength = strlen(enctypeBuf);
+
+ string->value = GSSEAP_MALLOC(prefixLength + enctypeLength + 1);
+ if (string->value == NULL) {
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_xfree(enctypeBuf);
+#endif
+ return ENOMEM;
+ }
+
+ if (prefixLength != 0)
+ memcpy(string->value, prefix, prefixLength);
+ memcpy((char *)string->value + prefixLength, enctypeBuf, enctypeLength);
+
+ string->length = prefixLength + enctypeLength;
+ ((char *)string->value)[string->length] = '\0';
+
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_xfree(enctypeBuf);
+#endif
+
+ return 0;
+}
projects / mech_eap.orig / blobdiff