2 * linux/net/sunrpc/gss_spkm3_unseal.c
4 * Copyright (c) 2003 The Regents of the University of Michigan.
7 * Andy Adamson <andros@umich.edu>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/types.h>
37 #include <linux/slab.h>
38 #include <linux/jiffies.h>
39 #include <linux/sunrpc/gss_spkm3.h>
40 #include <linux/crypto.h>
43 # define RPCDBG_FACILITY RPCDBG_AUTH
49 * only SPKM_MIC_TOK with md5 intg-alg is supported
52 spkm3_read_token(struct spkm3_ctx
*ctx
,
53 struct xdr_netobj
*read_token
, /* checksum */
54 struct xdr_buf
*message_buffer
, /* signbuf */
58 struct xdr_netobj wire_cksum
= {.len
=0, .data
= NULL
};
59 struct xdr_netobj md5cksum
= {.len
= 0, .data
= NULL
};
60 unsigned char *ptr
= (unsigned char *)read_token
->data
;
62 int bodysize
, md5elen
;
64 u32 ret
= GSS_S_DEFECTIVE_TOKEN
;
66 dprintk("RPC: spkm3_read_token read_token->len %d\n", read_token
->len
);
68 if (g_verify_token_header((struct xdr_netobj
*) &ctx
->mech_used
,
69 &bodysize
, &ptr
, read_token
->len
))
72 /* decode the token */
74 if (toktype
== SPKM_MIC_TOK
) {
76 if ((ret
= spkm3_verify_mic_token(&ptr
, &mic_hdrlen
, &cksum
)))
79 if (*cksum
++ != 0x03) {
80 dprintk("RPC: spkm3_read_token BAD checksum type\n");
84 cksum
++; /* move past the zbit */
86 if(!decode_asn1_bitstring(&wire_cksum
, cksum
, md5elen
- 1, 16))
89 /* HARD CODED FOR MD5 */
91 /* compute the checksum of the message.
92 * ptr + 2 = start of header piece of checksum
93 * mic_hdrlen + 2 = length of header piece of checksum
95 ret
= GSS_S_DEFECTIVE_TOKEN
;
96 code
= make_checksum(CKSUMTYPE_RSA_MD5
, ptr
+ 2,
98 message_buffer
, &md5cksum
);
103 dprintk("RPC: spkm3_read_token: digest wire_cksum.len %d:\n",
105 dprintk(" md5cksum.data\n");
106 print_hexl((u32
*) md5cksum
.data
, 16, 0);
107 dprintk(" cksum.data:\n");
108 print_hexl((u32
*) wire_cksum
.data
, wire_cksum
.len
, 0);
111 code
= memcmp(md5cksum
.data
, wire_cksum
.data
, wire_cksum
.len
);
116 dprintk("RPC: BAD or UNSUPPORTED SPKM3 token type: %d\n",toktype
);
120 /* XXX: need to add expiration and sequencing */
121 ret
= GSS_S_COMPLETE
;
124 kfree(md5cksum
.data
);
126 kfree(wire_cksum
.data
);