// Copyright (C) 2015 The Android Open Source Project
|
//
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
// you may not use this file except in compliance with the License.
|
// You may obtain a copy of the License at
|
//
|
// http://www.apache.org/licenses/LICENSE-2.0
|
//
|
// Unless required by applicable law or agreed to in writing, software
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
// See the License for the specific language governing permissions and
|
// limitations under the License.
|
|
#include <sys/types.h>
|
#include <sys/capability.h>
|
#include <unistd.h>
|
|
#include <libminijail.h>
|
|
#include <android-base/logging.h>
|
#include <android-base/macros.h>
|
|
gid_t groups[] = { 1001, 1002 };
|
|
void log_resugid() {
|
uid_t ruid, euid, suid;
|
gid_t rgid, egid, sgid;
|
getresuid(&ruid, &euid, &suid);
|
getresgid(&rgid, &egid, &sgid);
|
|
LOG(INFO) << "ruid " << ruid << " euid " << euid << " suid " << suid;
|
LOG(INFO) << "rgid " << rgid << " egid " << egid << " sgid " << sgid;
|
|
int nsupp_groups = getgroups(0, NULL);
|
if (nsupp_groups < 0) {
|
PLOG(FATAL) << "getgroups(0)";
|
}
|
if (nsupp_groups == 0) {
|
LOG(INFO) << "no supplemental groups";
|
return;
|
}
|
|
gid_t *list = (gid_t*)calloc((size_t)nsupp_groups, sizeof(gid_t));
|
nsupp_groups = getgroups(nsupp_groups, list);
|
if (nsupp_groups < 0) {
|
PLOG(FATAL) << "getgroups(nsupp_groups)";
|
}
|
for (size_t i = 0; i < (size_t)nsupp_groups; i++) {
|
LOG(INFO) << "supp gid " << i + 1 << " " << list[i];
|
}
|
free(list);
|
}
|
|
int main(void) {
|
log_resugid();
|
minijail *j = minijail_new();
|
minijail_change_user(j, "system");
|
minijail_change_group(j, "system");
|
minijail_set_supplementary_gids(j, arraysize(groups), groups);
|
// minijail_use_caps(j, CAP_TO_MASK(CAP_SETUID) | CAP_TO_MASK(CAP_SETGID));
|
// minijail_use_seccomp_filter(j);
|
// minijail_log_seccomp_filter_failures(j);
|
// minijail_parse_seccomp_filters(j, "/data/filter.policy");
|
minijail_enter(j);
|
log_resugid();
|
minijail_destroy(j);
|
// minijail *j2 = minijail_new();
|
// minijail_change_uid(j2, 5000);
|
// minijail_change_gid(j2, 5000);
|
// minijail_enter(j2);
|
// log_resugid();
|
return 0;
|
}
|
