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1 | /* |
2 | * linux/net/sunrpc/gss_spkm3_seal.c | |
3 | * | |
4 | * Copyright (c) 2003 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Andy Adamson <andros@umich.edu> | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
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. | |
21 | * | |
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. | |
33 | * | |
34 | */ | |
35 | ||
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/random.h> | |
41 | #include <linux/crypto.h> | |
42 | ||
43 | #ifdef RPC_DEBUG | |
44 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
45 | #endif | |
46 | ||
47 | /* | |
48 | * spkm3_make_token() | |
49 | * | |
50 | * Only SPKM_MIC_TOK with md5 intg-alg is supported | |
51 | */ | |
52 | ||
53 | u32 | |
54 | spkm3_make_token(struct spkm3_ctx *ctx, int qop_req, | |
55 | struct xdr_buf * text, struct xdr_netobj * token, | |
56 | int toktype) | |
57 | { | |
58 | s32 checksum_type; | |
59 | char tokhdrbuf[25]; | |
60 | struct xdr_netobj md5cksum = {.len = 0, .data = NULL}; | |
61 | struct xdr_netobj mic_hdr = {.len = 0, .data = tokhdrbuf}; | |
62 | int tmsglen, tokenlen = 0; | |
63 | unsigned char *ptr; | |
64 | s32 now; | |
65 | int ctxelen = 0, ctxzbit = 0; | |
66 | int md5elen = 0, md5zbit = 0; | |
67 | ||
68 | dprintk("RPC: spkm3_make_token\n"); | |
69 | ||
70 | now = jiffies; | |
71 | if (qop_req != 0) | |
72 | goto out_err; | |
73 | ||
74 | if (ctx->ctx_id.len != 16) { | |
75 | dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n", | |
76 | ctx->ctx_id.len); | |
77 | goto out_err; | |
78 | } | |
79 | ||
80 | switch (ctx->intg_alg) { | |
81 | case NID_md5: | |
82 | checksum_type = CKSUMTYPE_RSA_MD5; | |
83 | break; | |
84 | default: | |
85 | dprintk("RPC: gss_spkm3_seal: ctx->signalg %d not" | |
86 | " supported\n", ctx->intg_alg); | |
87 | goto out_err; | |
88 | } | |
89 | /* XXX since we don't support WRAP, perhaps we don't care... */ | |
90 | if (ctx->conf_alg != NID_cast5_cbc) { | |
91 | dprintk("RPC: gss_spkm3_seal: ctx->sealalg %d not supported\n", | |
92 | ctx->conf_alg); | |
93 | goto out_err; | |
94 | } | |
95 | ||
96 | if (toktype == SPKM_MIC_TOK) { | |
97 | tmsglen = 0; | |
98 | /* Calculate checksum over the mic-header */ | |
99 | asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit); | |
100 | spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data, | |
101 | ctxelen, ctxzbit); | |
102 | ||
103 | if (make_checksum(checksum_type, mic_hdr.data, mic_hdr.len, | |
104 | text, &md5cksum)) | |
105 | goto out_err; | |
106 | ||
107 | asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit); | |
108 | tokenlen = 10 + ctxelen + 1 + 2 + md5elen + 1; | |
109 | ||
110 | /* Create token header using generic routines */ | |
111 | token->len = g_token_size(&ctx->mech_used, tokenlen + tmsglen); | |
112 | ||
113 | ptr = token->data; | |
114 | g_make_token_header(&ctx->mech_used, tokenlen + tmsglen, &ptr); | |
115 | ||
116 | spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit); | |
117 | } else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */ | |
118 | dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK not supported\n"); | |
119 | goto out_err; | |
120 | } | |
121 | kfree(md5cksum.data); | |
122 | ||
123 | /* XXX need to implement sequence numbers, and ctx->expired */ | |
124 | ||
125 | return GSS_S_COMPLETE; | |
126 | out_err: | |
127 | if (md5cksum.data) | |
128 | kfree(md5cksum.data); | |
129 | token->data = NULL; | |
130 | token->len = 0; | |
131 | return GSS_S_FAILURE; | |
132 | } |