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 __attribute__ ((__noreturn__)) 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 if (!strcmp(optarg, "service")) {
61 backend = SELABEL_CTX_ANDROID_SERVICE;
62 } else {
63 fprintf(stderr, "Unknown backend: %s\n",
64 optarg);
65 usage(argv[0]);
66 }
67 break;
68 case 'f':
69 file = optarg;
70 break;
71 case 'v':
72 validate = (char *)1;
73 break;
74 case 'r':
75 raw = 1;
76 break;
77 case 'k':
78 key = optarg;
79 break;
80 case 't':
81 type = atoi(optarg);
82 break;
83 default:
84 usage(argv[0]);
85 }
86 }
87
88 selabel_option[0].value = file;
89 selabel_option[1].value = validate;
90
91 hnd = selabel_open(backend, selabel_option, 2);
92 if (!hnd) {
93 fprintf(stderr, "ERROR: selabel_open - Could not obtain "
94 "handle: %s\n",
95 strerror(errno));
96 return -1;
97 }
98
99 switch (raw) {
100 case 1:
101 rc = selabel_lookup_raw(hnd, &context, key, type);
102 break;
103 default:
104 rc = selabel_lookup(hnd, &context, key, type);
105 }
106 selabel_close(hnd);
107
108 if (rc) {
109 switch (errno) {
110 case ENOENT:
111 fprintf(stderr, "ERROR: selabel_lookup failed to "
112 "find a valid context.\n");
113 break;
114 case EINVAL:
115 fprintf(stderr, "ERROR: selabel_lookup failed to "
116 "validate context, or key / type are "
117 "invalid.\n");
118 break;
119 default:
120 fprintf(stderr, "selabel_lookup ERROR: %s\n",
121 strerror(errno));
122 }
123 } else {
124 printf("Default context: %s\n", context);
125 freecon(context);
126 }
127
128 return rc;
129 }
130