krb5: implement draft-ietf-kitten-aes-cts-hmac-sha2-07

2015-11-27 18:55:30 +11:00
parent a3bece16c7
commit 7b720cf61c
32 changed files with 1662 additions and 382 deletions
--- a/lib/krb5/salt-aes-sha2.c
+++ b/lib/krb5/salt-aes-sha2.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5_locl.h"
+
+int _krb5_AES_SHA2_string_to_default_iterator = 32768;
+
+static krb5_error_code
+AES_SHA2_string_to_key(krb5_context context,
+		       krb5_enctype enctype,
+		       krb5_data password,
+		       krb5_salt salt,
+		       krb5_data opaque,
+		       krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    uint32_t iter;
+    struct _krb5_encryption_type *et = NULL;
+    struct _krb5_key_data kd;
+    krb5_data saltp;
+    size_t enctypesz;
+    const EVP_MD *md = NULL;
+
+    krb5_data_zero(&saltp);
+    kd.key = NULL;
+    kd.schedule = NULL;
+
+    if (opaque.length == 0) {
+	iter = _krb5_AES_SHA2_string_to_default_iterator;
+    } else if (opaque.length == 4) {
+	unsigned long v;
+	_krb5_get_int(opaque.data, &v, 4);
+	iter = ((uint32_t)v);
+    } else {
+	ret = KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
+	goto cleanup;
+    }
+
+    et = _krb5_find_enctype(enctype);
+    if (et == NULL) {
+	ret = KRB5_PROG_KEYTYPE_NOSUPP;
+	goto cleanup;
+    }
+
+    kd.schedule = NULL;
+    ALLOC(kd.key, 1);
+    if (kd.key == NULL) {
+	ret = krb5_enomem(context);
+	goto cleanup;
+    }
+    kd.key->keytype = enctype;
+    ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
+    if (ret) {
+	ret = krb5_enomem(context);
+	goto cleanup;
+    }
+
+    enctypesz = strlen(et->name) + 1;
+    ret = krb5_data_alloc(&saltp, enctypesz + salt.saltvalue.length);
+    if (ret) {
+	ret = krb5_enomem(context);
+	goto cleanup;
+    }
+    memcpy(saltp.data, et->name, enctypesz);
+    memcpy((unsigned char *)saltp.data + enctypesz,
+	   salt.saltvalue.data, salt.saltvalue.length);
+
+    ret = _krb5_aes_sha2_md_for_enctype(context, enctype, &md);
+    if (ret)
+	goto cleanup;
+
+    ret = PKCS5_PBKDF2_HMAC(password.data, password.length,
+			    saltp.data, saltp.length,
+			    iter, md,
+			    et->keytype->size, kd.key->keyvalue.data);
+    if (ret != 1) {
+	krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
+			       "Error calculating s2k");
+	ret = KRB5_PROG_KEYTYPE_NOSUPP;
+	goto cleanup;
+    }
+
+    ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
+    if (ret)
+	goto cleanup;
+
+    ret = krb5_copy_keyblock_contents(context, kd.key, key);
+    if (ret)
+	goto cleanup;
+
+cleanup:
+    krb5_data_free(&saltp);
+    _krb5_free_key_data(context, &kd, et);
+
+    return ret;
+}
+
+struct salt_type _krb5_AES_SHA2_salt[] = {
+    {
+	KRB5_PW_SALT,
+	"pw-salt",
+	AES_SHA2_string_to_key
+    },
+    { 0, NULL, NULL }
+};