[CPUFREQ] Fix some more CPU hotplug locking.
[linux-2.6/libata-dev.git] / net / sunrpc / auth_gss / gss_krb5_unseal.c
blob0828cf64100f977d241dac71d393a0148aa8f09a
1 /*
2 * linux/net/sunrpc/gss_krb5_unseal.c
4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.c
6 * Copyright (c) 2000 The Regents of the University of Michigan.
7 * All rights reserved.
9 * Andy Adamson <andros@umich.edu>
13 * Copyright 1993 by OpenVision Technologies, Inc.
15 * Permission to use, copy, modify, distribute, and sell this software
16 * and its documentation for any purpose is hereby granted without fee,
17 * provided that the above copyright notice appears in all copies and
18 * that both that copyright notice and this permission notice appear in
19 * supporting documentation, and that the name of OpenVision not be used
20 * in advertising or publicity pertaining to distribution of the software
21 * without specific, written prior permission. OpenVision makes no
22 * representations about the suitability of this software for any
23 * purpose. It is provided "as is" without express or implied warranty.
25 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
26 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
27 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
28 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
29 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
30 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
31 * PERFORMANCE OF THIS SOFTWARE.
35 * Copyright (C) 1998 by the FundsXpress, INC.
37 * All rights reserved.
39 * Export of this software from the United States of America may require
40 * a specific license from the United States Government. It is the
41 * responsibility of any person or organization contemplating export to
42 * obtain such a license before exporting.
44 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
45 * distribute this software and its documentation for any purpose and
46 * without fee is hereby granted, provided that the above copyright
47 * notice appear in all copies and that both that copyright notice and
48 * this permission notice appear in supporting documentation, and that
49 * the name of FundsXpress. not be used in advertising or publicity pertaining
50 * to distribution of the software without specific, written prior
51 * permission. FundsXpress makes no representations about the suitability of
52 * this software for any purpose. It is provided "as is" without express
53 * or implied warranty.
55 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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57 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
60 #include <linux/types.h>
61 #include <linux/slab.h>
62 #include <linux/jiffies.h>
63 #include <linux/sunrpc/gss_krb5.h>
64 #include <linux/crypto.h>
66 #ifdef RPC_DEBUG
67 # define RPCDBG_FACILITY RPCDBG_AUTH
68 #endif
71 /* read_token is a mic token, and message_buffer is the data that the mic was
72 * supposedly taken over. */
74 u32
75 gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
76 struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
78 struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
79 int signalg;
80 int sealalg;
81 s32 checksum_type;
82 char cksumdata[16];
83 struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
84 s32 now;
85 int direction;
86 s32 seqnum;
87 unsigned char *ptr = (unsigned char *)read_token->data;
88 int bodysize;
89 u32 ret = GSS_S_DEFECTIVE_TOKEN;
91 dprintk("RPC: krb5_read_token\n");
93 if (g_verify_token_header(&ctx->mech_used, &bodysize, &ptr,
94 read_token->len))
95 goto out;
97 if ((*ptr++ != ((KG_TOK_MIC_MSG>>8)&0xff)) ||
98 (*ptr++ != ( KG_TOK_MIC_MSG &0xff)) )
99 goto out;
101 /* XXX sanity-check bodysize?? */
103 /* get the sign and seal algorithms */
105 signalg = ptr[0] + (ptr[1] << 8);
106 sealalg = ptr[2] + (ptr[3] << 8);
108 /* Sanity checks */
110 if ((ptr[4] != 0xff) || (ptr[5] != 0xff))
111 goto out;
113 if (sealalg != 0xffff)
114 goto out;
116 /* there are several mappings of seal algorithms to sign algorithms,
117 but few enough that we can try them all. */
119 if ((ctx->sealalg == SEAL_ALG_NONE && signalg > 1) ||
120 (ctx->sealalg == SEAL_ALG_1 && signalg != SGN_ALG_3) ||
121 (ctx->sealalg == SEAL_ALG_DES3KD &&
122 signalg != SGN_ALG_HMAC_SHA1_DES3_KD))
123 goto out;
125 /* compute the checksum of the message */
127 /* initialize the the cksum */
128 switch (signalg) {
129 case SGN_ALG_DES_MAC_MD5:
130 checksum_type = CKSUMTYPE_RSA_MD5;
131 break;
132 default:
133 ret = GSS_S_DEFECTIVE_TOKEN;
134 goto out;
137 switch (signalg) {
138 case SGN_ALG_DES_MAC_MD5:
139 ret = make_checksum(checksum_type, ptr - 2, 8,
140 message_buffer, 0, &md5cksum);
141 if (ret)
142 goto out;
144 ret = krb5_encrypt(ctx->seq, NULL, md5cksum.data,
145 md5cksum.data, 16);
146 if (ret)
147 goto out;
149 if (memcmp(md5cksum.data + 8, ptr + 14, 8)) {
150 ret = GSS_S_BAD_SIG;
151 goto out;
153 break;
154 default:
155 ret = GSS_S_DEFECTIVE_TOKEN;
156 goto out;
159 /* it got through unscathed. Make sure the context is unexpired */
161 now = get_seconds();
163 ret = GSS_S_CONTEXT_EXPIRED;
164 if (now > ctx->endtime)
165 goto out;
167 /* do sequencing checks */
169 ret = GSS_S_BAD_SIG;
170 if ((ret = krb5_get_seq_num(ctx->seq, ptr + 14, ptr + 6, &direction,
171 &seqnum)))
172 goto out;
174 if ((ctx->initiate && direction != 0xff) ||
175 (!ctx->initiate && direction != 0))
176 goto out;
178 ret = GSS_S_COMPLETE;
179 out:
180 return ret;