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
|
/*
* Written by Thierry Vignaud,
* heavilly modified for msec purpose by Vandoorselaere Yoann.
*
* This code is copyrighted by Mandriva [(c) 2000] and is released under
* the GPL licence
*/
/*
* TODO
* +++ hash tables or btree to stock already searched uid/gid for speed
* Pb: since linux-2.3.4x, uid & gid are 32 bits wide ... => BTREE?
* static char **uid_hash, **gid_hash;
*
* +++ check for open & I/O error on log files ...
* +++ Yoann scripts should avoid /dev if devfs is mounted (either by testing
* if /dev is mounted by devfs or if [ -f /dev/.devfsd ] => see with
* Yoann
* --- disable 'cannot stat ...' warning (???) => better log them SECURITY_LOG
* --- disable write test on links => OK
*/
/*
* (Vandoorselaere Yoann)
* Done :
* - Don't handle FTW_DNR case, since it will print warning for /proc file.
* - Don't walk trought /dev & /proc.
* - We don't need to handle all of the ftw flag, just the FTW_F & FTW_D one :)
* - Use FTW_PHYS to not follow symbolic link.
* - Do not use getenv to get the root directory.
* - Use argv instead of a DIR variable to get directory to scan.
* - Free directory after use when allocated for appending a '/'.
*/
#include <stdlib.h>
#include <stdio.h>
#define __USE_XOPEN_EXTENDED
#include <ftw.h>
#include <sys/stat.h>
/* For NSS managment */
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <regex.h>
#include <string.h>
#ifdef __GNUC__
#define inline
#else
#warning upgrade your so-called system to a real OS such as GNU/Linux
#endif
/*
* Log files
*/
static FILE *suid_fd;
static FILE *sgid_fd;
static FILE *unowned_user_fd;
static FILE *unowned_group_fd;
static FILE *writable_fd;
static regex_t exclude_regexp;
static int use_regexp = 0;
static int traverse(const char *file, const struct stat *sb, int flag, struct FTW *s)
{
struct passwd *u_nss_data;
struct group *g_nss_data;
/*
* handle bogus glibc ftw
* else we won't print only one '/' in front of file names
*/
if (strncmp(file, "//", 2) == 0 )
file++;
/*
* Don't walk throught /dev & /proc
*/
if ( (strncmp("/proc", file, 5) == 0) ||
(strncmp("/dev", file, 4) == 0) ||
(strncmp("/sys", file, 4) == 0) )
return 0;
if (use_regexp && regexec(&exclude_regexp, file, 0, NULL, 0) == 0) {
return 0;
}
switch (flag) {
/*
* Regular file handling.
*/
case FTW_F:
/*
* Is suid root check.
*/
if ((sb->st_mode & S_ISUID) && (sb->st_uid == 0))
fprintf(suid_fd, "%s\n", file);
/*
* Is suid group check.
*/
if (sb->st_mode & S_ISGID)
fprintf(sgid_fd, "%s\n", file);
/*
* Their is no break statement here, it is normal.
* Directory handing.
*/
case FTW_D:
/*
* Is world writable check.
*/
if ((sb->st_mode & 0002) && !(S_ISSOCK(sb->st_mode)) && !(S_ISFIFO(sb->st_mode))
&& !(S_ISCHR(sb->st_mode)) && !(S_ISBLK(sb->st_mode)))
fprintf(writable_fd, "%s\n", file);
/*
* Unowned user check.
*/
u_nss_data = getpwuid(sb->st_uid);
if (u_nss_data == NULL)
fprintf(unowned_user_fd, "%s\n", file);
/*
* Unowned group check.
*/
g_nss_data = getgrgid(sb->st_gid);
if (g_nss_data == NULL)
fprintf(unowned_group_fd, "%s\n", file);
break;
}
return 0;
}
/* This function opens all log files */
__inline__ static void init()
{
static const char *mode = "w+";
char *env;
suid_fd = fopen(getenv("SUID_ROOT_TODAY"), mode);
if ( ! suid_fd ) {
perror("fopen (suid_root_today)");
exit(1);
}
sgid_fd = fopen(getenv("SGID_TODAY"), mode);
if ( ! sgid_fd ) {
perror("fopen (sgid_today)");
exit(1);
}
writable_fd = fopen(getenv("WRITABLE_TODAY"), mode);
if ( ! writable_fd ) {
perror("fopen (writable_today)");
exit(1);
}
unowned_user_fd = fopen(getenv("UNOWNED_USER_TODAY"), mode);
if ( ! unowned_user_fd ) {
perror("fopen (unowned_user_today)");
exit(1);
}
unowned_group_fd = fopen(getenv("UNOWNED_GROUP_TODAY"), mode);
if ( ! unowned_group_fd ) {
perror("fopen (unowned_group_today)");
exit(1);
}
env = getenv("EXCLUDE_REGEXP");
if (env) {
if (regcomp(&exclude_regexp, env, 0) == 0) {
use_regexp = 1;
} else {
fprintf(stderr, "Unable to compile EXCLUDE_REGEXP '%s'\n", env);
exit(1);
}
}
}
int main(int argc, char **argv)
{
char *directory;
int res = 0, i;
int ctrl = 0;
if ( argc < 2 ) {
fprintf(stderr, "Please give directory as argument.\n");
fprintf(stderr, "%s /usr/sbin /sbin\n\n", argv[0]);
exit(1);
}
/* open all log files */
init();
for ( i = 1; i < argc; i++ ) {
if ( strcmp(argv[i], "/") != 0) {
/*
* We need to add a final '/' to the base directory name else the
* FTW_MOUNT option of nftw won't work. i.e. : /mnt/cdrom is on the /
* fs (it is the directory on which a CD is mounted) whereas
* /mnt/cdrom/ is the mounted directory.
* Hopefully, find has the same "bug"
*/
ctrl = 1;
directory = ( char * ) malloc((strlen(argv[i]) + 2));
if ( ! directory ) {
perror("malloc");
exit(1);
}
strcpy(directory, argv[i]);
strcat(directory, "/");
} else {
directory = argv[i];
}
res = nftw(directory, traverse, 200, FTW_PHYS | FTW_MOUNT);
if ( ctrl ) {
free(directory);
ctrl = 0;
}
}
/*
* close all log files
*/
fclose(suid_fd);
fclose(sgid_fd);
fclose(writable_fd);
fclose(unowned_user_fd);
fclose(unowned_group_fd);
exit(res);
}
|
