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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_skcipher *cipher;
47 unsigned char plain[8];
48 s32 code;
49
50 dprintk("RPC: %s:\n", __func__);
51 cipher = crypto_alloc_skcipher(kctx->gk5e->encrypt_name, 0,
52 CRYPTO_ALG_ASYNC);
53 if (IS_ERR(cipher))
54 return PTR_ERR(cipher);
55
56 plain[0] = (unsigned char) ((seqnum >> 24) & 0xff);
57 plain[1] = (unsigned char) ((seqnum >> 16) & 0xff);
58 plain[2] = (unsigned char) ((seqnum >> 8) & 0xff);
59 plain[3] = (unsigned char) ((seqnum >> 0) & 0xff);
60 plain[4] = direction;
61 plain[5] = direction;
62 plain[6] = direction;
63 plain[7] = direction;
64
65 code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
66 if (code)
67 goto out;
68
69 code = krb5_encrypt(cipher, cksum, plain, buf, 8);
70out:
71 crypto_free_skcipher(cipher);
72 return code;
73}
74s32
75krb5_make_seq_num(struct krb5_ctx *kctx,
76 struct crypto_skcipher *key,
77 int direction,
78 u32 seqnum,
79 unsigned char *cksum, unsigned char *buf)
80{
81 unsigned char plain[8];
82
83 if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
84 return krb5_make_rc4_seq_num(kctx, direction, seqnum,
85 cksum, buf);
86
87 plain[0] = (unsigned char) (seqnum & 0xff);
88 plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
89 plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
90 plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
91
92 plain[4] = direction;
93 plain[5] = direction;
94 plain[6] = direction;
95 plain[7] = direction;
96
97 return krb5_encrypt(key, cksum, plain, buf, 8);
98}
99
100static s32
101krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum,
102 unsigned char *buf, int *direction, s32 *seqnum)
103{
104 struct crypto_skcipher *cipher;
105 unsigned char plain[8];
106 s32 code;
107
108 dprintk("RPC: %s:\n", __func__);
109 cipher = crypto_alloc_skcipher(kctx->gk5e->encrypt_name, 0,
110 CRYPTO_ALG_ASYNC);
111 if (IS_ERR(cipher))
112 return PTR_ERR(cipher);
113
114 code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
115 if (code)
116 goto out;
117
118 code = krb5_decrypt(cipher, cksum, buf, plain, 8);
119 if (code)
120 goto out;
121
122 if ((plain[4] != plain[5]) || (plain[4] != plain[6])
123 || (plain[4] != plain[7])) {
124 code = (s32)KG_BAD_SEQ;
125 goto out;
126 }
127
128 *direction = plain[4];
129
130 *seqnum = ((plain[0] << 24) | (plain[1] << 16) |
131 (plain[2] << 8) | (plain[3]));
132out:
133 crypto_free_skcipher(cipher);
134 return code;
135}
136
137s32
138krb5_get_seq_num(struct krb5_ctx *kctx,
139 unsigned char *cksum,
140 unsigned char *buf,
141 int *direction, u32 *seqnum)
142{
143 s32 code;
144 unsigned char plain[8];
145 struct crypto_skcipher *key = kctx->seq;
146
147 dprintk("RPC: krb5_get_seq_num:\n");
148
149 if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
150 return krb5_get_rc4_seq_num(kctx, cksum, buf,
151 direction, seqnum);
152
153 if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
154 return code;
155
156 if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
157 (plain[4] != plain[7]))
158 return (s32)KG_BAD_SEQ;
159
160 *direction = plain[4];
161
162 *seqnum = ((plain[0]) |
163 (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
164
165 return 0;
166}