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1/*
2 * linux/net/sunrpc/gss_krb5_seqnum.c
3 *
4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
5 *
6 * Copyright (c) 2000 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Andy Adamson <andros@umich.edu>
10 */
11
12/*
13 * Copyright 1993 by OpenVision Technologies, Inc.
14 *
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.
24 *
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.
32 */
33
34#include <crypto/skcipher.h>
35#include <linux/types.h>
36#include <linux/sunrpc/gss_krb5.h>
37
38#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
39# define RPCDBG_FACILITY RPCDBG_AUTH
40#endif
41
42s32
43krb5_make_seq_num(struct krb5_ctx *kctx,
44 struct crypto_sync_skcipher *key,
45 int direction,
46 u32 seqnum,
47 unsigned char *cksum, unsigned char *buf)
48{
49 unsigned char *plain;
50 s32 code;
51
52 plain = kmalloc(8, GFP_KERNEL);
53 if (!plain)
54 return -ENOMEM;
55
56 plain[0] = (unsigned char) (seqnum & 0xff);
57 plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
58 plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
59 plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
60
61 plain[4] = direction;
62 plain[5] = direction;
63 plain[6] = direction;
64 plain[7] = direction;
65
66 code = krb5_encrypt(key, cksum, plain, buf, 8);
67 kfree(plain);
68 return code;
69}
70
71s32
72krb5_get_seq_num(struct krb5_ctx *kctx,
73 unsigned char *cksum,
74 unsigned char *buf,
75 int *direction, u32 *seqnum)
76{
77 s32 code;
78 unsigned char *plain;
79 struct crypto_sync_skcipher *key = kctx->seq;
80
81 dprintk("RPC: krb5_get_seq_num:\n");
82
83 plain = kmalloc(8, GFP_KERNEL);
84 if (!plain)
85 return -ENOMEM;
86
87 if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
88 goto out;
89
90 if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
91 (plain[4] != plain[7])) {
92 code = (s32)KG_BAD_SEQ;
93 goto out;
94 }
95
96 *direction = plain[4];
97
98 *seqnum = ((plain[0]) |
99 (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
100
101out:
102 kfree(plain);
103 return code;
104}
1/*
2 * linux/net/sunrpc/gss_krb5_seqnum.c
3 *
4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
5 *
6 * Copyright (c) 2000 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Andy Adamson <andros@umich.edu>
10 */
11
12/*
13 * Copyright 1993 by OpenVision Technologies, Inc.
14 *
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.
24 *
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.
32 */
33
34#include <crypto/skcipher.h>
35#include <linux/types.h>
36#include <linux/sunrpc/gss_krb5.h>
37
38#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
39# define RPCDBG_FACILITY RPCDBG_AUTH
40#endif
41
42static s32
43krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum,
44 unsigned char *cksum, unsigned char *buf)
45{
46 struct crypto_sync_skcipher *cipher;
47 unsigned char *plain;
48 s32 code;
49
50 dprintk("RPC: %s:\n", __func__);
51 cipher = crypto_alloc_sync_skcipher(kctx->gk5e->encrypt_name, 0, 0);
52 if (IS_ERR(cipher))
53 return PTR_ERR(cipher);
54
55 plain = kmalloc(8, GFP_NOFS);
56 if (!plain)
57 return -ENOMEM;
58
59 plain[0] = (unsigned char) ((seqnum >> 24) & 0xff);
60 plain[1] = (unsigned char) ((seqnum >> 16) & 0xff);
61 plain[2] = (unsigned char) ((seqnum >> 8) & 0xff);
62 plain[3] = (unsigned char) ((seqnum >> 0) & 0xff);
63 plain[4] = direction;
64 plain[5] = direction;
65 plain[6] = direction;
66 plain[7] = direction;
67
68 code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
69 if (code)
70 goto out;
71
72 code = krb5_encrypt(cipher, cksum, plain, buf, 8);
73out:
74 kfree(plain);
75 crypto_free_sync_skcipher(cipher);
76 return code;
77}
78s32
79krb5_make_seq_num(struct krb5_ctx *kctx,
80 struct crypto_sync_skcipher *key,
81 int direction,
82 u32 seqnum,
83 unsigned char *cksum, unsigned char *buf)
84{
85 unsigned char *plain;
86 s32 code;
87
88 if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
89 return krb5_make_rc4_seq_num(kctx, direction, seqnum,
90 cksum, buf);
91
92 plain = kmalloc(8, GFP_NOFS);
93 if (!plain)
94 return -ENOMEM;
95
96 plain[0] = (unsigned char) (seqnum & 0xff);
97 plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
98 plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
99 plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
100
101 plain[4] = direction;
102 plain[5] = direction;
103 plain[6] = direction;
104 plain[7] = direction;
105
106 code = krb5_encrypt(key, cksum, plain, buf, 8);
107 kfree(plain);
108 return code;
109}
110
111static s32
112krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum,
113 unsigned char *buf, int *direction, s32 *seqnum)
114{
115 struct crypto_sync_skcipher *cipher;
116 unsigned char *plain;
117 s32 code;
118
119 dprintk("RPC: %s:\n", __func__);
120 cipher = crypto_alloc_sync_skcipher(kctx->gk5e->encrypt_name, 0, 0);
121 if (IS_ERR(cipher))
122 return PTR_ERR(cipher);
123
124 code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
125 if (code)
126 goto out;
127
128 plain = kmalloc(8, GFP_NOFS);
129 if (!plain) {
130 code = -ENOMEM;
131 goto out;
132 }
133
134 code = krb5_decrypt(cipher, cksum, buf, plain, 8);
135 if (code)
136 goto out_plain;
137
138 if ((plain[4] != plain[5]) || (plain[4] != plain[6])
139 || (plain[4] != plain[7])) {
140 code = (s32)KG_BAD_SEQ;
141 goto out_plain;
142 }
143
144 *direction = plain[4];
145
146 *seqnum = ((plain[0] << 24) | (plain[1] << 16) |
147 (plain[2] << 8) | (plain[3]));
148out_plain:
149 kfree(plain);
150out:
151 crypto_free_sync_skcipher(cipher);
152 return code;
153}
154
155s32
156krb5_get_seq_num(struct krb5_ctx *kctx,
157 unsigned char *cksum,
158 unsigned char *buf,
159 int *direction, u32 *seqnum)
160{
161 s32 code;
162 unsigned char *plain;
163 struct crypto_sync_skcipher *key = kctx->seq;
164
165 dprintk("RPC: krb5_get_seq_num:\n");
166
167 if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
168 return krb5_get_rc4_seq_num(kctx, cksum, buf,
169 direction, seqnum);
170 plain = kmalloc(8, GFP_NOFS);
171 if (!plain)
172 return -ENOMEM;
173
174 if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
175 goto out;
176
177 if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
178 (plain[4] != plain[7])) {
179 code = (s32)KG_BAD_SEQ;
180 goto out;
181 }
182
183 *direction = plain[4];
184
185 *seqnum = ((plain[0]) |
186 (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
187
188out:
189 kfree(plain);
190 return code;
191}