1 #include <errno.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <string.h>
5
6 #include <sepol/policydb/services.h>
7 #include <sepol/sepol.h>
8
9
main(int argc,char * argv[])10 int main(int argc, char *argv[])
11 {
12 FILE *fp;
13 sepol_security_id_t ssid, tsid, out_sid;
14 sepol_security_class_t tclass;
15 char *context;
16 size_t context_len;
17
18 if (argc != 5) {
19 printf("usage: %s policy scontext tcontext tclass\n", argv[0]);
20 return 1;
21 }
22
23 fp = fopen(argv[1], "r");
24 if (!fp) {
25 fprintf(stderr, "Can't open policy %s: %s\n", argv[1], strerror(errno));
26 return 1;
27 }
28 if (sepol_set_policydb_from_file(fp) < 0) {
29 fprintf(stderr, "Error while processing policy %s: %s\n", argv[1], strerror(errno));
30 fclose(fp);
31 return 1;
32 }
33 fclose(fp);
34
35 if (sepol_context_to_sid(argv[2], strlen(argv[2]), &ssid) < 0) {
36 fprintf(stderr, "Invalid source context %s\n", argv[2]);
37 return 1;
38 }
39
40 if (sepol_context_to_sid(argv[3], strlen(argv[3]), &tsid) < 0) {
41 fprintf(stderr, "Invalid target context %s\n", argv[3]);
42 return 1;
43 }
44
45 if (sepol_string_to_security_class(argv[4], &tclass) < 0) {
46 fprintf(stderr, "Invalid security class %s\n", argv[4]);
47 return 1;
48 }
49
50 if (sepol_change_sid(ssid, tsid, tclass, &out_sid) < 0) {
51 fprintf(stderr, "Failed to compute changed sid: %s\n", strerror(errno));
52 return 1;
53 }
54
55 if (sepol_sid_to_context(out_sid, &context, &context_len) < 0) {
56 fprintf(stderr, "Failed to convert sid %u: %s\n", out_sid, strerror(errno));
57 return 1;
58 }
59
60 printf("%s\n", context);
61 free(context);
62
63 return 0;
64 }
65