summaryrefslogtreecommitdiffstats
path: root/net/sunrpc/auth_gss/gss_krb5_seal.c
blob: f43311221a72b9a8b4f56cd177a33e5cd0296b41 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 *  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

spinlock_t krb5_seq_lock = SPIN_LOCK_UNLOCKED;

u32
gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
		struct xdr_netobj *token)
{
	struct krb5_ctx		*ctx = gss_ctx->internal_ctx_id;
	s32			checksum_type;
	char			cksumdata[16];
	struct xdr_netobj	md5cksum = {.len = 0, .data = cksumdata};
	unsigned char		*ptr, *krb5_hdr, *msg_start;
	s32			now;
	u32			seq_send;

	dprintk("RPC:     gss_krb5_seal\n");

	now = get_seconds();

	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;
	}

	token->len = g_token_size(&ctx->mech_used, 22);

	ptr = token->data;
	g_make_token_header(&ctx->mech_used, 22, &ptr);

	*ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
	*ptr++ = (unsigned char) (KG_TOK_MIC_MSG&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 (make_checksum(checksum_type, krb5_hdr, 8, text, 0, &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();
	}

	spin_lock(&krb5_seq_lock);
	seq_send = ctx->seq_send++;
	spin_unlock(&krb5_seq_lock);

	if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
			       seq_send, krb5_hdr + 16, krb5_hdr + 8)))
		goto out_err;

	return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
out_err:
	return GSS_S_FAILURE;
}