2 * linux/net/sunrpc/gss_krb5_seal.c
4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
6 * Copyright (c) 2000 The Regents of the University of Michigan.
9 * Andy Adamson <andros@umich.edu>
10 * J. Bruce Fields <bfields@umich.edu>
14 * Copyright 1993 by OpenVision Technologies, Inc.
16 * Permission to use, copy, modify, distribute, and sell this software
17 * and its documentation for any purpose is hereby granted without fee,
18 * provided that the above copyright notice appears in all copies and
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21 * in advertising or publicity pertaining to distribution of the software
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36 * Copyright (C) 1998 by the FundsXpress, INC.
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61 #include <linux/types.h>
62 #include <linux/slab.h>
63 #include <linux/jiffies.h>
64 #include <linux/sunrpc/gss_krb5.h>
65 #include <linux/random.h>
66 #include <asm/scatterlist.h>
67 #include <linux/crypto.h>
70 # define RPCDBG_FACILITY RPCDBG_AUTH
74 krb5_make_token(struct krb5_ctx
*ctx
, int qop_req
,
75 struct xdr_buf
*text
, struct xdr_netobj
*token
)
78 struct xdr_netobj md5cksum
= {.len
= 0, .data
= NULL
};
79 unsigned char *ptr
, *krb5_hdr
, *msg_start
;
82 dprintk("RPC: gss_krb5_seal\n");
89 switch (ctx
->signalg
) {
90 case SGN_ALG_DES_MAC_MD5
:
91 checksum_type
= CKSUMTYPE_RSA_MD5
;
94 dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
95 " supported\n", ctx
->signalg
);
98 if (ctx
->sealalg
!= SEAL_ALG_NONE
&& ctx
->sealalg
!= SEAL_ALG_DES
) {
99 dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
104 token
->len
= g_token_size(&ctx
->mech_used
, 22);
107 g_make_token_header(&ctx
->mech_used
, 22, &ptr
);
109 *ptr
++ = (unsigned char) ((KG_TOK_MIC_MSG
>>8)&0xff);
110 *ptr
++ = (unsigned char) (KG_TOK_MIC_MSG
&0xff);
112 /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
114 msg_start
= krb5_hdr
+ 24;
116 *(u16
*)(krb5_hdr
+ 2) = htons(ctx
->signalg
);
117 memset(krb5_hdr
+ 4, 0xff, 4);
119 if (make_checksum(checksum_type
, krb5_hdr
, 8, text
, 0, &md5cksum
))
122 switch (ctx
->signalg
) {
123 case SGN_ALG_DES_MAC_MD5
:
124 if (krb5_encrypt(ctx
->seq
, NULL
, md5cksum
.data
,
125 md5cksum
.data
, md5cksum
.len
))
127 memcpy(krb5_hdr
+ 16,
128 md5cksum
.data
+ md5cksum
.len
- KRB5_CKSUM_LENGTH
,
131 dprintk("RPC: make_seal_token: cksum data: \n");
132 print_hexl((u32
*) (krb5_hdr
+ 16), KRB5_CKSUM_LENGTH
, 0);
138 kfree(md5cksum
.data
);
140 if ((krb5_make_seq_num(ctx
->seq
, ctx
->initiate
? 0 : 0xff,
141 ctx
->seq_send
, krb5_hdr
+ 16, krb5_hdr
+ 8)))
146 return ((ctx
->endtime
< now
) ? GSS_S_CONTEXT_EXPIRED
: GSS_S_COMPLETE
);
148 if (md5cksum
.data
) kfree(md5cksum
.data
);
149 return GSS_S_FAILURE
;