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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
/*
* This software may now be redistributed outside the US.
*
* $Source: /cvs/OpenBSD/src/kerberosIV/krb/Attic/kname_parse.c,v $
*
* $Locker: $
*/
/*
Copyright (C) 1989 by the Massachusetts Institute of Technology
Export of this software from the United States of America is assumed
to 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.
*/
#include "krb_locl.h"
#define INSTANCE_DOTS_OK 0
/* max size of full name */
#define FULL_SZ (ANAME_SZ + INST_SZ + REALM_SZ)
#define NAME 0 /* which field are we in? */
#define INST 1
#define REALM 2
/*
* This file contains four routines for handling Kerberos names.
*
* kname_parse() breaks a Kerberos name into its name, instance,
* and realm components.
*
* k_isname(), k_isinst(), and k_isrealm() check a given string to see if
* it's a syntactically legitimate respective part of a Kerberos name,
* returning 1 if it is, 0 if it isn't.
*
* Definition of "syntactically legitimate" names is according to
* the Project Athena Technical Plan Section E.2.1, page 7 "Specifying
* names", version dated 21 Dec 1987.
*/
/*
* kname_parse() takes a Kerberos name "fullname" of the form:
*
* username[.instance][@realm]
*
* and returns the three components ("name", "instance", and "realm"
* in the example above) in the given arguments "np", "ip", and "rp".
*
* If successful, it returns KSUCCESS. If there was an error,
* KNAME_FMT is returned.
*/
int
kname_parse(np, ip, rp, fullname)
char *np;
char *ip;
char *rp;
char *fullname;
{
static char buf[FULL_SZ];
char *rnext, *wnext; /* next char to read, write */
register char c;
int backslash;
int field;
backslash = 0;
rnext = buf;
wnext = np;
field = NAME;
if (strlen(fullname) > FULL_SZ)
return KNAME_FMT;
(void) strcpy(buf, fullname);
while ((c = *rnext++)) {
if (backslash) {
*wnext++ = c;
backslash = 0;
continue;
}
switch (c) {
case '\\':
backslash++;
break;
case '.':
switch (field) {
case NAME:
if (wnext == np)
return KNAME_FMT;
*wnext = '\0';
field = INST;
wnext = ip;
break;
case INST:
#if INSTANCE_DOTS_OK
*wnext++ = c;
break;
#else /* INSTANCE_DOTS_OK */
return KNAME_FMT;
#endif /* INSTANCE_DOTS_OK */
/* break; */
case REALM:
*wnext++ = c;
break;
default:
fprintf(stderr, "unknown field value\n");
exit(1);
}
break;
case '@':
switch (field) {
case NAME:
if (wnext == np)
return KNAME_FMT;
*ip = '\0';
/* fall through */
case INST:
*wnext = '\0';
field = REALM;
wnext = rp;
break;
case REALM:
return KNAME_FMT;
default:
fprintf(stderr, "unknown field value\n");
exit(1);
}
break;
default:
*wnext++ = c;
}
}
*wnext = '\0';
if ((strlen(np) > ANAME_SZ - 1) ||
(strlen(ip) > INST_SZ - 1) ||
(strlen(rp) > REALM_SZ - 1))
return KNAME_FMT;
return KSUCCESS;
}
/*
* k_isname() returns 1 if the given name is a syntactically legitimate
* Kerberos name; returns 0 if it's not.
*/
int
k_isname(s)
char *s;
{
register char c;
int backslash = 0;
if (!*s)
return 0;
if (strlen(s) > ANAME_SZ - 1)
return 0;
while ((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '.':
return 0;
/* break; */
case '@':
return 0;
/* break; */
}
}
return 1;
}
/*
* k_isinst() returns 1 if the given name is a syntactically legitimate
* Kerberos instance; returns 0 if it's not.
*/
int
k_isinst(s)
char *s;
{
register char c;
int backslash = 0;
if (strlen(s) > INST_SZ - 1)
return 0;
while ((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '.':
#if INSTANCE_DOTS_OK
break;
#else /* INSTANCE_DOTS_OK */
return 0;
#endif /* INSTANCE_DOTS_OK */
/* break; */
case '@':
return 0;
/* break; */
}
}
return 1;
}
/*
* k_isrealm() returns 1 if the given name is a syntactically legitimate
* Kerberos realm; returns 0 if it's not.
*/
int
k_isrealm(s)
char *s;
{
register char c;
int backslash = 0;
if (!*s)
return 0;
if (strlen(s) > REALM_SZ - 1)
return 0;
while ((c = *s++)) {
if (backslash) {
backslash = 0;
continue;
}
switch(c) {
case '\\':
backslash = 1;
break;
case '@':
return 0;
/* break; */
}
}
return 1;
}
|
