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-rw-r--r--net/sunrpc/auth_gss/gss_krb5_seal.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
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index 0000000..afeeb87
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+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
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+/*
+ * linux/net/sunrpc/gss_krb5_seal.c
+ *
+ * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
+ *
+ * Copyright (c) 2000 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@umich.edu>
+ * J. Bruce Fields <bfields@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.
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may require
+ * a specific license from the United States Government. It is the
+ * responsibility of any person or organization contemplating export to
+ * obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. FundsXpress makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/random.h>
+#include <asm/scatterlist.h>
+#include <linux/crypto.h>
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+static inline int
+gss_krb5_padding(int blocksize, int length) {
+ /* Most of the code is block-size independent but in practice we
+ * use only 8: */
+ BUG_ON(blocksize != 8);
+ return 8 - (length & 7);
+}
+
+u32
+krb5_make_token(struct krb5_ctx *ctx, int qop_req,
+ struct xdr_buf *text, struct xdr_netobj *token,
+ int toktype)
+{
+ s32 checksum_type;
+ struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
+ int blocksize = 0, tmsglen;
+ unsigned char *ptr, *krb5_hdr, *msg_start;
+ s32 now;
+
+ dprintk("RPC: gss_krb5_seal\n");
+
+ now = get_seconds();
+
+ if (qop_req != 0)
+ goto out_err;
+
+ switch (ctx->signalg) {
+ case SGN_ALG_DES_MAC_MD5:
+ checksum_type = CKSUMTYPE_RSA_MD5;
+ break;
+ default:
+ dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
+ " supported\n", ctx->signalg);
+ goto out_err;
+ }
+ if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
+ dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
+ ctx->sealalg);
+ goto out_err;
+ }
+
+ if (toktype == KG_TOK_WRAP_MSG) {
+ blocksize = crypto_tfm_alg_blocksize(ctx->enc);
+ tmsglen = blocksize + text->len
+ + gss_krb5_padding(blocksize, blocksize + text->len);
+ } else {
+ tmsglen = 0;
+ }
+
+ token->len = g_token_size(&ctx->mech_used, 22 + tmsglen);
+
+ ptr = token->data;
+ g_make_token_header(&ctx->mech_used, 22 + tmsglen, &ptr);
+
+ *ptr++ = (unsigned char) ((toktype>>8)&0xff);
+ *ptr++ = (unsigned char) (toktype&0xff);
+
+ /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
+ krb5_hdr = ptr - 2;
+ msg_start = krb5_hdr + 24;
+
+ *(u16 *)(krb5_hdr + 2) = htons(ctx->signalg);
+ memset(krb5_hdr + 4, 0xff, 4);
+ if (toktype == KG_TOK_WRAP_MSG)
+ *(u16 *)(krb5_hdr + 4) = htons(ctx->sealalg);
+
+ if (toktype == KG_TOK_WRAP_MSG) {
+ /* XXX removing support for now */
+ goto out_err;
+ } else { /* Sign only. */
+ if (make_checksum(checksum_type, krb5_hdr, 8, text,
+ &md5cksum))
+ goto out_err;
+ }
+
+ switch (ctx->signalg) {
+ case SGN_ALG_DES_MAC_MD5:
+ if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
+ md5cksum.data, md5cksum.len))
+ goto out_err;
+ memcpy(krb5_hdr + 16,
+ md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
+ KRB5_CKSUM_LENGTH);
+
+ dprintk("RPC: make_seal_token: cksum data: \n");
+ print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0);
+ break;
+ default:
+ BUG();
+ }
+
+ kfree(md5cksum.data);
+
+ if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
+ ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8)))
+ goto out_err;
+
+ ctx->seq_send++;
+
+ return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
+out_err:
+ if (md5cksum.data) kfree(md5cksum.data);
+ return GSS_S_FAILURE;
+}
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