summaryrefslogtreecommitdiff
path: root/net/sunrpc/auth_gss/gss_spkm3_seal.c
blob: 148201e929d08de77ca44f6b6dfbe8da20ab7e04 (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
/*
 *  linux/net/sunrpc/gss_spkm3_seal.c
 *
 *  Copyright (c) 2003 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/sunrpc/gss_spkm3.h>
#include <linux/random.h>
#include <linux/crypto.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY        RPCDBG_AUTH
#endif

/*
 * spkm3_make_token()
 *
 * Only SPKM_MIC_TOK with md5 intg-alg is supported
 */

u32
spkm3_make_token(struct spkm3_ctx *ctx,
		   struct xdr_buf * text, struct xdr_netobj * token,
		   int toktype)
{
	s32			checksum_type;
	char			tokhdrbuf[25];
	struct xdr_netobj	md5cksum = {.len = 0, .data = NULL};
	struct xdr_netobj	mic_hdr = {.len = 0, .data = tokhdrbuf};
	int			tmsglen, tokenlen = 0;
	unsigned char		*ptr;
	s32			now;
	int			ctxelen = 0, ctxzbit = 0;
	int			md5elen = 0, md5zbit = 0;

	dprintk("RPC: spkm3_make_token\n");

	now = jiffies;

	if (ctx->ctx_id.len != 16) {
		dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n",
			ctx->ctx_id.len);
		goto out_err;
	}
		
	switch (ctx->intg_alg) {
		case NID_md5:
			checksum_type = CKSUMTYPE_RSA_MD5;
			break;
		default:
			dprintk("RPC: gss_spkm3_seal: ctx->signalg %d not"
				" supported\n", ctx->intg_alg);
			goto out_err;
	}
	/* XXX since we don't support WRAP, perhaps we don't care... */
	if (ctx->conf_alg != NID_cast5_cbc) {
		dprintk("RPC: gss_spkm3_seal: ctx->sealalg %d not supported\n",
			ctx->conf_alg);
		goto out_err;
	}

	if (toktype == SPKM_MIC_TOK) {
		tmsglen = 0;
		/* Calculate checksum over the mic-header */
		asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit);
		spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data,
		                         ctxelen, ctxzbit);

		if (make_checksum(checksum_type, mic_hdr.data, mic_hdr.len, 
		                             text, &md5cksum))
			goto out_err;

		asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit);
		tokenlen = 10 + ctxelen + 1 + 2 + md5elen + 1;

		/* Create token header using generic routines */
		token->len = g_token_size(&ctx->mech_used, tokenlen + tmsglen);

		ptr = token->data;
		g_make_token_header(&ctx->mech_used, tokenlen + tmsglen, &ptr);

		spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit);
	} else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */
		dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK not supported\n");
		goto out_err;
	}
	kfree(md5cksum.data);

	/* XXX need to implement sequence numbers, and ctx->expired */

	return  GSS_S_COMPLETE;
out_err:
	if (md5cksum.data) 
		kfree(md5cksum.data);
	token->data = NULL;
	token->len = 0;
	return GSS_S_FAILURE;
}