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
|
/* $OpenBSD: getgrouplist.c,v 1.30 2022/08/02 17:00:15 deraadt Exp $ */
/*
* Copyright (c) 2008 Ingo Schwarze <schwarze@usta.de>
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* get credential
*/
#include <sys/types.h>
#include <sys/limits.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <pwd.h>
#include <errno.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#ifdef YP
#define _PATH_NETID "/etc/netid"
#define MAXLINELENGTH 1024
static int _parse_netid(char*, uid_t, gid_t*, int*, int);
static int _read_netid(const char *, uid_t, gid_t*, int*, int);
/*
* Parse one string of the form "uid:gid[,gid[,...]]".
* If the uid matches, add the groups to the group list.
* If the groups fit, return 1, otherwise return -1.
* If the uid does not match, return 0.
*/
static int
_parse_netid(char *netid, uid_t uid, gid_t *groups, int *ngroups,
int maxgroups)
{
const char *errstr = NULL;
char *start, *p;
uid_t tuid;
gid_t gid;
int i;
/* Check the uid. */
p = strchr(netid, ':');
if (!p)
return (0);
*p++ = '\0';
tuid = (uid_t)strtonum(netid, 0, UID_MAX, &errstr);
if (errstr || tuid != uid)
return (0);
/* Loop over the gids. */
while (p && *p) {
start = p;
p = strchr(start, ',');
if (p)
*p++ = '\0';
gid = (gid_t)strtonum(start, 0, GID_MAX, &errstr);
if (errstr)
continue;
/* Skip this group if it is already in the list. */
for (i = 0; i < *ngroups; i++)
if (groups[i] == gid)
break;
/* Try to add this new group to the list. */
if (i == *ngroups) {
if (*ngroups >= maxgroups)
return (-1);
groups[(*ngroups)++] = gid;
}
}
return (1);
}
/*
* Search /etc/netid for a particular uid and process that line.
* See _parse_netid for details, including return values.
*/
static int
_read_netid(const char *key, uid_t uid, gid_t *groups, int *ngroups,
int maxgroups)
{
FILE *fp;
char line[MAXLINELENGTH], *p;
int found = 0;
fp = fopen(_PATH_NETID, "re");
if (!fp)
return (0);
while (!found && fgets(line, sizeof(line), fp)) {
p = strchr(line, '\n');
if (p)
*p = '\0';
else { /* Skip lines that are too long. */
int ch;
while ((ch = getc_unlocked(fp)) != '\n' && ch != EOF)
;
continue;
}
p = strchr(line, ' ');
if (!p)
continue;
*p++ = '\0';
if (strcmp(line, key))
continue;
found = _parse_netid(p, uid, groups, ngroups, maxgroups);
}
(void)fclose(fp);
return (found);
}
#endif /* YP */
int
getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
{
int i, ngroups = 0, ret = 0, maxgroups = *grpcnt, bail;
int needyp = 0, foundyp = 0;
int *skipyp = &foundyp;
extern struct group *_getgrent_yp(int *);
struct group *grp;
/*
* install primary group
*/
if (ngroups >= maxgroups) {
*grpcnt = ngroups;
return (-1);
}
groups[ngroups++] = agroup;
/*
* Scan the group file to find additional groups.
*/
setgrent();
while ((grp = _getgrent_yp(skipyp)) || foundyp) {
if (foundyp) {
if (foundyp > 0)
needyp = 1;
else
skipyp = NULL;
foundyp = 0;
continue;
}
if (grp->gr_gid == agroup)
continue;
for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
if (groups[i] == grp->gr_gid)
bail = 1;
if (bail)
continue;
for (i = 0; grp->gr_mem[i]; i++) {
if (!strcmp(grp->gr_mem[i], uname)) {
if (ngroups >= maxgroups) {
ret = -1;
goto out;
}
groups[ngroups++] = grp->gr_gid;
break;
}
}
}
#ifdef YP
/*
* If we were told that there is a YP marker, look at netid data.
*/
if (skipyp && needyp) {
char buf[MAXLINELENGTH], *ypdata = NULL, *key;
static char *__ypdomain;
struct passwd pwstore;
int ypdatalen;
/* Construct the netid key to look up. */
if (getpwnam_r(uname, &pwstore, buf, sizeof buf, NULL) ||
(!__ypdomain && yp_get_default_domain(&__ypdomain)))
goto out;
i = asprintf(&key, "unix.%u@%s", pwstore.pw_uid, __ypdomain);
if (i == -1)
goto out;
/* First scan the static netid file. */
switch (_read_netid(key, pwstore.pw_uid,
groups, &ngroups, maxgroups)) {
case -1:
ret = -1;
/* FALLTHROUGH */
case 1:
free(key);
goto out;
default:
break;
}
/* Only access YP when there is no static entry. */
if (!yp_match(__ypdomain, "netid.byname", key,
(int)strlen(key), &ypdata, &ypdatalen))
if (_parse_netid(ypdata, pwstore.pw_uid,
groups, &ngroups, maxgroups) == -1)
ret = -1;
free(key);
free(ypdata);
}
#endif /* YP */
out:
endgrent();
*grpcnt = ngroups;
return (ret);
}
DEF_WEAK(getgrouplist);
|
