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Add a simple tool to set SECBIT_EXEC_RESTRICT_FILE or SECBIT_EXEC_DENY_INTERACTIVE before executing a command. This is useful to easily test against enlighten script interpreters. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Paul Moore <paul@paul-moore.com> Cc: Serge Hallyn <serge@hallyn.com> Signed-off-by: Mickaël Salaün <mic@digikod.net> Link: https://lore.kernel.org/r/20241212174223.389435-6-mic@digikod.net Signed-off-by: Kees Cook <kees@kernel.org>
85 lines
2 KiB
C
85 lines
2 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Simple tool to set SECBIT_EXEC_RESTRICT_FILE, SECBIT_EXEC_DENY_INTERACTIVE,
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* before executing a command.
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*
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* Copyright © 2024 Microsoft Corporation
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*/
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#define _GNU_SOURCE
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#define __SANE_USERSPACE_TYPES__
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#include <errno.h>
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#include <linux/prctl.h>
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#include <linux/securebits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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static void print_usage(const char *argv0)
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{
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fprintf(stderr, "usage: %s -f|-i -- <cmd> [args]...\n\n", argv0);
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fprintf(stderr, "Execute a command with\n");
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fprintf(stderr, "- SECBIT_EXEC_RESTRICT_FILE set: -f\n");
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fprintf(stderr, "- SECBIT_EXEC_DENY_INTERACTIVE set: -i\n");
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}
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int main(const int argc, char *const argv[], char *const *const envp)
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{
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const char *cmd_path;
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char *const *cmd_argv;
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int opt, secbits_cur, secbits_new;
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bool has_policy = false;
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secbits_cur = prctl(PR_GET_SECUREBITS);
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if (secbits_cur == -1) {
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/*
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* This should never happen, except with a buggy seccomp
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* filter.
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*/
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perror("ERROR: Failed to get securebits");
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return 1;
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}
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secbits_new = secbits_cur;
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while ((opt = getopt(argc, argv, "fi")) != -1) {
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switch (opt) {
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case 'f':
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secbits_new |= SECBIT_EXEC_RESTRICT_FILE |
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SECBIT_EXEC_RESTRICT_FILE_LOCKED;
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has_policy = true;
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break;
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case 'i':
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secbits_new |= SECBIT_EXEC_DENY_INTERACTIVE |
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SECBIT_EXEC_DENY_INTERACTIVE_LOCKED;
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has_policy = true;
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break;
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default:
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print_usage(argv[0]);
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return 1;
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}
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}
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if (!argv[optind] || !has_policy) {
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print_usage(argv[0]);
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return 1;
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}
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if (secbits_cur != secbits_new &&
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prctl(PR_SET_SECUREBITS, secbits_new)) {
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perror("Failed to set secure bit(s).");
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fprintf(stderr,
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"Hint: The running kernel may not support this feature.\n");
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return 1;
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}
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cmd_path = argv[optind];
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cmd_argv = argv + optind;
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fprintf(stderr, "Executing command...\n");
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execvpe(cmd_path, cmd_argv, envp);
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fprintf(stderr, "Failed to execute \"%s\": %s\n", cmd_path,
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strerror(errno));
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return 1;
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}
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