2 * linux/net/sunrpc/gss_krb5_seal.c
4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
6 * Copyright (c) 2000 The Regents of the University of Michigan.
9 * Andy Adamson <andros@umich.edu>
10 * J. Bruce Fields <bfields@umich.edu>
14 * Copyright 1993 by OpenVision Technologies, Inc.
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.
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.
36 * Copyright (C) 1998 by the FundsXpress, INC.
38 * All rights reserved.
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.
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.
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.
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 <asm/scatterlist.h>
67 #include <linux/crypto.h>
70 # define RPCDBG_FACILITY RPCDBG_AUTH
74 gss_get_mic_kerberos(struct gss_ctx
*gss_ctx
, struct xdr_buf
*text
,
75 struct xdr_netobj
*token
)
77 struct krb5_ctx
*ctx
= gss_ctx
->internal_ctx_id
;
79 struct xdr_netobj md5cksum
= {.len
= 0, .data
= NULL
};
80 unsigned char *ptr
, *krb5_hdr
, *msg_start
;
83 dprintk("RPC: gss_krb5_seal\n");
87 switch (ctx
->signalg
) {
88 case SGN_ALG_DES_MAC_MD5
:
89 checksum_type
= CKSUMTYPE_RSA_MD5
;
92 dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
93 " supported\n", ctx
->signalg
);
96 if (ctx
->sealalg
!= SEAL_ALG_NONE
&& ctx
->sealalg
!= SEAL_ALG_DES
) {
97 dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
102 token
->len
= g_token_size(&ctx
->mech_used
, 22);
105 g_make_token_header(&ctx
->mech_used
, 22, &ptr
);
107 *ptr
++ = (unsigned char) ((KG_TOK_MIC_MSG
>>8)&0xff);
108 *ptr
++ = (unsigned char) (KG_TOK_MIC_MSG
&0xff);
110 /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
112 msg_start
= krb5_hdr
+ 24;
114 *(u16
*)(krb5_hdr
+ 2) = htons(ctx
->signalg
);
115 memset(krb5_hdr
+ 4, 0xff, 4);
117 if (make_checksum(checksum_type
, krb5_hdr
, 8, text
, 0, &md5cksum
))
120 switch (ctx
->signalg
) {
121 case SGN_ALG_DES_MAC_MD5
:
122 if (krb5_encrypt(ctx
->seq
, NULL
, md5cksum
.data
,
123 md5cksum
.data
, md5cksum
.len
))
125 memcpy(krb5_hdr
+ 16,
126 md5cksum
.data
+ md5cksum
.len
- KRB5_CKSUM_LENGTH
,
129 dprintk("RPC: make_seal_token: cksum data: \n");
130 print_hexl((u32
*) (krb5_hdr
+ 16), KRB5_CKSUM_LENGTH
, 0);
136 kfree(md5cksum
.data
);
138 if ((krb5_make_seq_num(ctx
->seq
, ctx
->initiate
? 0 : 0xff,
139 ctx
->seq_send
, krb5_hdr
+ 16, krb5_hdr
+ 8)))
144 return ((ctx
->endtime
< now
) ? GSS_S_CONTEXT_EXPIRED
: GSS_S_COMPLETE
);
146 if (md5cksum
.data
) kfree(md5cksum
.data
);
147 return GSS_S_FAILURE
;