1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* $Source$
* $Author$
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_mk_safe()
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_mk_safe_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/asn1.h>
#include <krb5/los-proto.h>
#include <krb5/ext-proto.h>
/*
Formats a KRB_SAFE message into outbuf.
userdata is formatted as the user data in the message.
sumtype specifies the encryption type; key specifies the key which
might be used to seed the checksum; sender_addr and recv_addr specify
the full addresses (host and port) of the sender and receiver.
The host portion of sender_addr is used to form the addresses used in the
KRB_SAFE message.
The outbuf buffer storage is allocated, and should be freed by the
caller when finished.
returns system errors
*/
krb5_error_code
krb5_mk_safe(DECLARG(const krb5_data *, userdata),
DECLARG(const krb5_cksumtype, sumtype),
DECLARG(const krb5_keyblock *, key),
DECLARG(const krb5_address *, sender_addr),
DECLARG(const krb5_address *, recv_addr),
DECLARG(krb5_int32, seq_number),
DECLARG(krb5_int32, safe_flags),
DECLARG(krb5_rcache, rcache),
DECLARG(krb5_data *, outbuf))
OLDDECLARG(const krb5_data *, userdata)
OLDDECLARG(const krb5_cksumtype, sumtype)
OLDDECLARG(const krb5_keyblock *, key)
OLDDECLARG(const krb5_address *, sender_addr)
OLDDECLARG(const krb5_address *, recv_addr)
OLDDECLARG(krb5_int32, seq_number)
OLDDECLARG(krb5_int32, safe_flags)
OLDDECLARG(krb5_rcache, rcache)
OLDDECLARG(krb5_data *, outbuf)
{
krb5_error_code retval;
krb5_safe safemsg;
krb5_octet zero_octet = 0;
krb5_checksum safe_checksum;
krb5_data *scratch;
if (!valid_cksumtype(sumtype))
return KRB5_PROG_SUMTYPE_NOSUPP;
if (!is_coll_proof_cksum(sumtype) || !is_keyed_cksum(sumtype))
return KRB5KRB_AP_ERR_INAPP_CKSUM;
safemsg.user_data = *userdata;
safemsg.s_address = (krb5_address *)sender_addr;
if (recv_addr)
safemsg.r_address = (krb5_address *)recv_addr;
else
safemsg.r_address = 0;
if (!(safe_flags & KRB5_SAFE_NOTIME)) {
if (!rcache)
/* gotta provide an rcache in this case... */
return KRB5_RC_REQUIRED;
if (retval = krb5_us_timeofday(&safemsg.timestamp, &safemsg.usec))
return retval;
} else
safemsg.timestamp = 0, safemsg.usec = 0;
if (safe_flags & KRB5_SAFE_DOSEQUENCE) {
safemsg.seq_number = seq_number;
} else
safemsg.seq_number = 0;
/* to do the checksum stuff, we need to encode the message with a
zero-length zero-type checksum, then checksum the encoding, then
re-encode with the
checksum. */
safe_checksum.checksum_type = 0;
safe_checksum.length = 0;
safe_checksum.contents = &zero_octet;
safemsg.checksum = &safe_checksum;
if (retval = encode_krb5_safe(&safemsg, &scratch))
return retval;
#define clean_scratch() {(void) memset((char *)scratch->data, 0,\
scratch->length); \
krb5_free_data(scratch);}
if (!(safe_checksum.contents =
(krb5_octet *) malloc(krb5_checksum_size(sumtype)))) {
clean_scratch();
return ENOMEM;
}
if (retval = krb5_calculate_checksum(sumtype, scratch->data,
scratch->length,
(krb5_pointer) key->contents,
key->length, &safe_checksum)) {
xfree(safe_checksum.contents);
clean_scratch();
return retval;
}
safemsg.checksum = &safe_checksum;
clean_scratch();
if (retval = encode_krb5_safe(&safemsg, &scratch)) {
xfree(safe_checksum.contents);
return retval;
}
xfree(safe_checksum.contents);
if (!(safe_flags & KRB5_SAFE_NOTIME)) {
krb5_donot_replay replay;
if (retval = krb5_gen_replay_name(sender_addr, "_safe",
&replay.client)) {
clean_scratch();
return retval;
}
replay.server = ""; /* XXX */
replay.cusec = safemsg.usec;
replay.ctime = safemsg.timestamp;
if (retval = krb5_rc_store(rcache, &replay)) {
/* should we really error out here? XXX */
clean_scratch();
xfree(replay.client);
return retval;
}
xfree(replay.client);
}
*outbuf = *scratch;
xfree(scratch);
return 0;
}
|
