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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2019 by Tomohiro Kusumi. All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
static void
test_stat_mode(mode_t extra)
{
struct stat st;
int i, fd;
char fpath[1024];
char *penv[] = {"TESTDIR", "TESTFILE0"};
char buf[] = "test";
mode_t res;
mode_t mode = 0777 | extra;
/*
* Get the environment variable values.
*/
for (i = 0; i < sizeof (penv) / sizeof (char *); i++) {
if ((penv[i] = getenv(penv[i])) == NULL) {
fprintf(stderr, "getenv(penv[%d])\n", i);
exit(1);
}
}
umask(0);
if (stat(penv[0], &st) == -1 && mkdir(penv[0], mode) == -1) {
perror("mkdir");
exit(2);
}
snprintf(fpath, sizeof (fpath), "%s/%s", penv[0], penv[1]);
unlink(fpath);
if (stat(fpath, &st) == 0) {
fprintf(stderr, "%s exists\n", fpath);
exit(3);
}
fd = creat(fpath, mode);
if (fd == -1) {
perror("creat");
exit(4);
}
close(fd);
if (setuid(65534) == -1) {
perror("setuid");
exit(5);
}
fd = open(fpath, O_RDWR);
if (fd == -1) {
perror("open");
exit(6);
}
if (write(fd, buf, sizeof (buf)) == -1) {
perror("write");
exit(7);
}
close(fd);
if (stat(fpath, &st) == -1) {
perror("stat");
exit(8);
}
unlink(fpath);
/* Verify SUID/SGID are dropped */
res = st.st_mode & (0777 | S_ISUID | S_ISGID);
if (res != (mode & 0777)) {
fprintf(stderr, "stat(2) %o\n", res);
exit(9);
}
}
int
main(int argc, char *argv[])
{
const char *name;
mode_t extra;
if (argc < 2) {
fprintf(stderr, "Invalid argc\n");
exit(1);
}
name = argv[1];
if (strcmp(name, "SUID") == 0) {
extra = S_ISUID;
} else if (strcmp(name, "SGID") == 0) {
extra = S_ISGID;
} else if (strcmp(name, "SUID_SGID") == 0) {
extra = S_ISUID | S_ISGID;
} else if (strcmp(name, "NONE") == 0) {
extra = 0;
} else {
fprintf(stderr, "Invalid name %s\n", name);
exit(1);
}
test_stat_mode(extra);
return (0);
}
|
