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#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <selinux/selinux.h>
#include <selinux/get_context_list.h>
static __attribute__ ((__noreturn__)) void usage(const char *name, const char *detail, int rc)
{
fprintf(stderr, "usage: %s [-r role] [-l level] [-s service] [-v] user [fromcon]\n", name);
if (detail)
fprintf(stderr, "%s: %s\n", name, detail);
exit(rc);
}
int main(int argc, char **argv)
{
const char *cur_context, *user;
char *usercon = NULL, *cur_con = NULL;
char *level = NULL, *role=NULL, *seuser=NULL, *dlevel=NULL;
char *service = NULL;
int ret, opt;
int verbose = 0;
while ((opt = getopt(argc, argv, "l:r:s:v")) > 0) {
switch (opt) {
case 'l':
free(level);
level = strdup(optarg);
break;
case 'r':
free(role);
role = strdup(optarg);
break;
case 's':
free(service);
service = strdup(optarg);
break;
case 'v':
verbose = 1;
break;
default:
usage(argv[0], "invalid option", 1);
}
}
if (((argc - optind) < 1) || ((argc - optind) > 2))
usage(argv[0], "invalid number of arguments", 2);
/* If selinux isn't available, bail out. */
if (!is_selinux_enabled()) {
fprintf(stderr,
"%s may be used only on a SELinux kernel.\n", argv[0]);
free(level);
free(role);
free(service);
return 1;
}
user = argv[optind];
/* If a context wasn't passed, use the current context. */
if ((argc - optind) < 2) {
if (getcon(&cur_con) < 0) {
fprintf(stderr, "%s: couldn't get current context: %s\n", argv[0], strerror(errno));
free(level);
free(role);
free(service);
return 2;
}
cur_context = cur_con;
} else
cur_context = argv[optind + 1];
if (security_check_context(cur_context)) {
fprintf(stderr, "%s: invalid from context '%s'\n", argv[0], cur_context);
free(cur_con);
free(level);
free(role);
free(service);
return 3;
}
ret = getseuser(user, service, &seuser, &dlevel);
if (ret) {
fprintf(stderr, "%s: failed to get seuser: %s\n", argv[0], strerror(errno));
goto out;
}
if (! level) level=dlevel;
if (role != NULL && role[0])
ret = get_default_context_with_rolelevel(seuser, role, level, cur_context, &usercon);
else
ret = get_default_context_with_level(seuser, level, cur_context, &usercon);
if (ret) {
fprintf(stderr, "%s: failed to get default context: %s\n", argv[0], strerror(errno));
goto out;
}
if (verbose) {
printf("%s: %s from %s %s %s %s -> %s\n", argv[0], user, cur_context, seuser, role, level, usercon);
} else {
printf("%s\n", usercon);
}
out:
free(role);
free(seuser);
if (level != dlevel) free(level);
free(dlevel);
free(usercon);
free(cur_con);
free(service);
return ret >= 0;
}
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