93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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nsjail - seccomp-bpf sandboxing
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-----------------------------------------
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Copyright 2014 Google Inc. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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#include "sandbox.h"
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <stddef.h>
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#include <sys/prctl.h>
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extern "C" {
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#include "kafel.h"
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}
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#include "logs.h"
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namespace sandbox {
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#ifndef PR_SET_NO_NEW_PRIVS /* in prctl.h since Linux 3.5 */
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#define PR_SET_NO_NEW_PRIVS 38
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#endif /* PR_SET_NO_NEW_PRIVS */
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static bool prepareAndCommit(nsjconf_t* nsjconf) {
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if (nsjconf->kafel_file_path == NULL && nsjconf->kafel_string == NULL) {
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return true;
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}
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if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
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PLOG_W("prctl(PR_SET_NO_NEW_PRIVS, 1) failed");
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return false;
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}
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if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &nsjconf->seccomp_fprog, 0, 0)) {
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PLOG_W("prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER) failed");
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return false;
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}
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return true;
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}
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bool applyPolicy(nsjconf_t* nsjconf) {
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return prepareAndCommit(nsjconf);
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}
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bool preparePolicy(nsjconf_t* nsjconf) {
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if (nsjconf->kafel_file_path == NULL && nsjconf->kafel_string == NULL) {
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return true;
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}
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FILE* f = NULL;
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if (nsjconf->kafel_file_path && !(f = fopen(nsjconf->kafel_file_path, "r"))) {
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PLOG_W(
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"Couldn't open the kafel seccomp policy file '%s'", nsjconf->kafel_file_path);
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return false;
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}
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kafel_ctxt_t ctxt = kafel_ctxt_create();
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if (f) {
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kafel_set_input_file(ctxt, f);
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} else if (nsjconf->kafel_string) {
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kafel_set_input_string(ctxt, nsjconf->kafel_string);
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} else {
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LOG_F(
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"No kafel seccomp-bpf config file available, nor policy as a string was "
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"defined");
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}
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if (kafel_compile(ctxt, &nsjconf->seccomp_fprog) != 0) {
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LOG_E("Could not compile policy: %s", kafel_error_msg(ctxt));
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kafel_ctxt_destroy(&ctxt);
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return false;
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}
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kafel_ctxt_destroy(&ctxt);
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return true;
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}
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} // namespace sandbox
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