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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /net/sunrpc/auth_gss/gss_krb5_seqnum.c
Initial import
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_seqnum.c')
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_seqnum.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seqnum.c b/net/sunrpc/auth_gss/gss_krb5_seqnum.c
new file mode 100644
index 000000000..20d55c793
--- /dev/null
+++ b/net/sunrpc/auth_gss/gss_krb5_seqnum.c
@@ -0,0 +1,166 @@
+/*
+ * linux/net/sunrpc/gss_krb5_seqnum.c
+ *
+ * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
+ *
+ * Copyright (c) 2000 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/crypto.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+static s32
+krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum,
+ unsigned char *cksum, unsigned char *buf)
+{
+ struct crypto_blkcipher *cipher;
+ unsigned char plain[8];
+ s32 code;
+
+ dprintk("RPC: %s:\n", __func__);
+ cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(cipher))
+ return PTR_ERR(cipher);
+
+ plain[0] = (unsigned char) ((seqnum >> 24) & 0xff);
+ plain[1] = (unsigned char) ((seqnum >> 16) & 0xff);
+ plain[2] = (unsigned char) ((seqnum >> 8) & 0xff);
+ plain[3] = (unsigned char) ((seqnum >> 0) & 0xff);
+ plain[4] = direction;
+ plain[5] = direction;
+ plain[6] = direction;
+ plain[7] = direction;
+
+ code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
+ if (code)
+ goto out;
+
+ code = krb5_encrypt(cipher, cksum, plain, buf, 8);
+out:
+ crypto_free_blkcipher(cipher);
+ return code;
+}
+s32
+krb5_make_seq_num(struct krb5_ctx *kctx,
+ struct crypto_blkcipher *key,
+ int direction,
+ u32 seqnum,
+ unsigned char *cksum, unsigned char *buf)
+{
+ unsigned char plain[8];
+
+ if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
+ return krb5_make_rc4_seq_num(kctx, direction, seqnum,
+ cksum, buf);
+
+ plain[0] = (unsigned char) (seqnum & 0xff);
+ plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
+ plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
+ plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
+
+ plain[4] = direction;
+ plain[5] = direction;
+ plain[6] = direction;
+ plain[7] = direction;
+
+ return krb5_encrypt(key, cksum, plain, buf, 8);
+}
+
+static s32
+krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum,
+ unsigned char *buf, int *direction, s32 *seqnum)
+{
+ struct crypto_blkcipher *cipher;
+ unsigned char plain[8];
+ s32 code;
+
+ dprintk("RPC: %s:\n", __func__);
+ cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(cipher))
+ return PTR_ERR(cipher);
+
+ code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
+ if (code)
+ goto out;
+
+ code = krb5_decrypt(cipher, cksum, buf, plain, 8);
+ if (code)
+ goto out;
+
+ if ((plain[4] != plain[5]) || (plain[4] != plain[6])
+ || (plain[4] != plain[7])) {
+ code = (s32)KG_BAD_SEQ;
+ goto out;
+ }
+
+ *direction = plain[4];
+
+ *seqnum = ((plain[0] << 24) | (plain[1] << 16) |
+ (plain[2] << 8) | (plain[3]));
+out:
+ crypto_free_blkcipher(cipher);
+ return code;
+}
+
+s32
+krb5_get_seq_num(struct krb5_ctx *kctx,
+ unsigned char *cksum,
+ unsigned char *buf,
+ int *direction, u32 *seqnum)
+{
+ s32 code;
+ unsigned char plain[8];
+ struct crypto_blkcipher *key = kctx->seq;
+
+ dprintk("RPC: krb5_get_seq_num:\n");
+
+ if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
+ return krb5_get_rc4_seq_num(kctx, cksum, buf,
+ direction, seqnum);
+
+ if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
+ return code;
+
+ if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
+ (plain[4] != plain[7]))
+ return (s32)KG_BAD_SEQ;
+
+ *direction = plain[4];
+
+ *seqnum = ((plain[0]) |
+ (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
+
+ return 0;
+}