1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <getopt.h>
5 #include <errno.h>
6 #include <selinux/selinux.h>
7 #include <selinux/label.h>
8
usage(const char * progname)9 static void usage(const char *progname)
10 {
11 fprintf(stderr,
12 "usage: %s -b backend [-v] [-r] -k key [-t type] [-f file]\n\n"
13 "Where:\n\t"
14 "-b The backend - \"file\", \"media\", \"x\", \"db\" or "
15 "\"prop\"\n\t"
16 "-v Validate entries against loaded policy.\n\t"
17 "-r Use \"raw\" function.\n\t"
18 "-k Lookup key - Depends on backend.\n\t"
19 "-t Lookup type - Optional as depends on backend.\n\t"
20 "-f Optional file containing the specs (defaults to\n\t"
21 " those used by loaded policy).\n\n"
22 "Examples:\n\t"
23 "%s -v -b file -k /run -t 0\n\t"
24 " lookup with validation against the loaded policy, the\n\t"
25 " \"file\" backend for path \"/run\" with mode = 0\n\t"
26 "%s -r -b x -t 4 -k X11:ButtonPress\n\t"
27 " lookup_raw the \"X\" backend for type SELABEL_X_EVENT\n\t"
28 " using key \"X11:ButtonPress\"\n\n",
29 progname, progname, progname);
30 exit(1);
31 }
32
main(int argc,char ** argv)33 int main(int argc, char **argv)
34 {
35 int raw = 0, type = 0, backend = 0, rc, opt;
36 char *validate = NULL, *key = NULL, *context = NULL, *file = NULL;
37
38 struct selabel_handle *hnd;
39 struct selinux_opt selabel_option[] = {
40 { SELABEL_OPT_PATH, file },
41 { SELABEL_OPT_VALIDATE, validate }
42 };
43
44 if (argc < 3)
45 usage(argv[0]);
46
47 while ((opt = getopt(argc, argv, "b:f:vrk:t:")) > 0) {
48 switch (opt) {
49 case 'b':
50 if (!strcasecmp(optarg, "file")) {
51 backend = SELABEL_CTX_FILE;
52 } else if (!strcmp(optarg, "media")) {
53 backend = SELABEL_CTX_MEDIA;
54 } else if (!strcmp(optarg, "x")) {
55 backend = SELABEL_CTX_X;
56 } else if (!strcmp(optarg, "db")) {
57 backend = SELABEL_CTX_DB;
58 } else if (!strcmp(optarg, "prop")) {
59 backend = SELABEL_CTX_ANDROID_PROP;
60 } else {
61 fprintf(stderr, "Unknown backend: %s\n",
62 optarg);
63 usage(argv[0]);
64 }
65 break;
66 case 'f':
67 file = optarg;
68 break;
69 case 'v':
70 validate = (char *)1;
71 break;
72 case 'r':
73 raw = 1;
74 break;
75 case 'k':
76 key = optarg;
77 break;
78 case 't':
79 type = atoi(optarg);
80 break;
81 default:
82 usage(argv[0]);
83 }
84 }
85
86 selabel_option[0].value = file;
87 selabel_option[1].value = validate;
88
89 hnd = selabel_open(backend, selabel_option, 2);
90 if (!hnd) {
91 fprintf(stderr, "ERROR: selabel_open - Could not obtain "
92 "handle.\n");
93 return -1;
94 }
95
96 switch (raw) {
97 case 1:
98 rc = selabel_lookup_raw(hnd, &context, key, type);
99 break;
100 default:
101 rc = selabel_lookup(hnd, &context, key, type);
102 }
103 selabel_close(hnd);
104
105 if (rc) {
106 switch (errno) {
107 case ENOENT:
108 fprintf(stderr, "ERROR: selabel_lookup failed to "
109 "find a valid context.\n");
110 break;
111 case EINVAL:
112 fprintf(stderr, "ERROR: selabel_lookup failed to "
113 "validate context, or key / type are "
114 "invalid.\n");
115 break;
116 default:
117 fprintf(stderr, "selabel_lookup ERROR: %s\n",
118 strerror(errno));
119 }
120 } else {
121 printf("Default context: %s\n", context);
122 freecon(context);
123 }
124
125 return rc;
126 }
127