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Linux/net/sunrpc/auth_gss/gss_krb5_seal.c

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  1 /*
  2  *  linux/net/sunrpc/gss_krb5_seal.c
  3  *
  4  *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
  5  *
  6  *  Copyright (c) 2000 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Andy Adamson        <andros@umich.edu>
 10  *  J. Bruce Fields     <bfields@umich.edu>
 11  */
 12 
 13 /*
 14  * Copyright 1993 by OpenVision Technologies, Inc.
 15  *
 16  * Permission to use, copy, modify, distribute, and sell this software
 17  * and its documentation for any purpose is hereby granted without fee,
 18  * provided that the above copyright notice appears in all copies and
 19  * that both that copyright notice and this permission notice appear in
 20  * supporting documentation, and that the name of OpenVision not be used
 21  * in advertising or publicity pertaining to distribution of the software
 22  * without specific, written prior permission. OpenVision makes no
 23  * representations about the suitability of this software for any
 24  * purpose.  It is provided "as is" without express or implied warranty.
 25  *
 26  * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 27  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 28  * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 29  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 30  * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 31  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 32  * PERFORMANCE OF THIS SOFTWARE.
 33  */
 34 
 35 /*
 36  * Copyright (C) 1998 by the FundsXpress, INC.
 37  *
 38  * All rights reserved.
 39  *
 40  * Export of this software from the United States of America may require
 41  * a specific license from the United States Government.  It is the
 42  * responsibility of any person or organization contemplating export to
 43  * obtain such a license before exporting.
 44  *
 45  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 46  * distribute this software and its documentation for any purpose and
 47  * without fee is hereby granted, provided that the above copyright
 48  * notice appear in all copies and that both that copyright notice and
 49  * this permission notice appear in supporting documentation, and that
 50  * the name of FundsXpress. not be used in advertising or publicity pertaining
 51  * to distribution of the software without specific, written prior
 52  * permission.  FundsXpress makes no representations about the suitability of
 53  * this software for any purpose.  It is provided "as is" without express
 54  * or implied warranty.
 55  *
 56  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 57  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 58  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 59  */
 60 
 61 #include <linux/types.h>
 62 #include <linux/slab.h>
 63 #include <linux/jiffies.h>
 64 #include <linux/sunrpc/gss_krb5.h>
 65 #include <linux/random.h>
 66 #include <linux/crypto.h>
 67 
 68 #ifdef RPC_DEBUG
 69 # define RPCDBG_FACILITY        RPCDBG_AUTH
 70 #endif
 71 
 72 DEFINE_SPINLOCK(krb5_seq_lock);
 73 
 74 u32
 75 gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
 76                 struct xdr_netobj *token)
 77 {
 78         struct krb5_ctx         *ctx = gss_ctx->internal_ctx_id;
 79         char                    cksumdata[16];
 80         struct xdr_netobj       md5cksum = {.len = 0, .data = cksumdata};
 81         unsigned char           *ptr, *msg_start;
 82         s32                     now;
 83         u32                     seq_send;
 84 
 85         dprintk("RPC:       gss_krb5_seal\n");
 86         BUG_ON(ctx == NULL);
 87 
 88         now = get_seconds();
 89 
 90         token->len = g_token_size(&ctx->mech_used, GSS_KRB5_TOK_HDR_LEN + 8);
 91 
 92         ptr = token->data;
 93         g_make_token_header(&ctx->mech_used, GSS_KRB5_TOK_HDR_LEN + 8, &ptr);
 94 
 95         /* ptr now at header described in rfc 1964, section 1.2.1: */
 96         ptr[0] = (unsigned char) ((KG_TOK_MIC_MSG >> 8) & 0xff);
 97         ptr[1] = (unsigned char) (KG_TOK_MIC_MSG & 0xff);
 98 
 99         msg_start = ptr + GSS_KRB5_TOK_HDR_LEN + 8;
100 
101         *(__be16 *)(ptr + 2) = htons(SGN_ALG_DES_MAC_MD5);
102         memset(ptr + 4, 0xff, 4);
103 
104         if (make_checksum("md5", ptr, 8, text, 0, &md5cksum))
105                 return GSS_S_FAILURE;
106 
107         if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
108                           md5cksum.data, md5cksum.len))
109                 return GSS_S_FAILURE;
110 
111         memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data + md5cksum.len - 8, 8);
112 
113         spin_lock(&krb5_seq_lock);
114         seq_send = ctx->seq_send++;
115         spin_unlock(&krb5_seq_lock);
116 
117         if (krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
118                               seq_send, ptr + GSS_KRB5_TOK_HDR_LEN,
119                               ptr + 8))
120                 return GSS_S_FAILURE;
121 
122         return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
123 }
124 

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