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