9bc96108d1
veriexec_check_path_label() can be used to check if a specified path has a label associated with it that contains the what we want. Obtained from: Juniper Networks, Inc.
214 lines
4.9 KiB
C
214 lines
4.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021-2023, Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/mac.h>
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#include <unistd.h>
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#include <string.h>
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#include <security/mac_veriexec/mac_veriexec.h>
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/**
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* @brief get veriexec params for a process
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*
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* @return
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* @li 0 if successful
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*/
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int
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veriexec_get_pid_params(pid_t pid,
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struct mac_veriexec_syscall_params *params)
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{
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struct mac_veriexec_syscall_params_args args;
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if (params == NULL)
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return EINVAL;
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args.u.pid = pid;
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args.params = params;
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return mac_syscall(MAC_VERIEXEC_NAME,
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MAC_VERIEXEC_GET_PARAMS_PID_SYSCALL, &args);
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}
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/**
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* @brief get veriexec params for a process
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*
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* @return
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* @li 0 if successful
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*/
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int
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veriexec_get_path_params(const char *file,
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struct mac_veriexec_syscall_params *params)
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{
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struct mac_veriexec_syscall_params_args args;
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if (file == NULL || params == NULL)
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return EINVAL;
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args.u.filename = file;
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args.params = params;
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return mac_syscall(MAC_VERIEXEC_NAME,
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MAC_VERIEXEC_GET_PARAMS_PATH_SYSCALL, &args);
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}
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/**
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* @brief check if a process has label that contains what we want
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*
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* @return
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* @li 0 if no
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* @li 1 if yes
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*/
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int
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veriexec_check_pid_label(pid_t pid, const char *want)
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{
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struct mac_veriexec_syscall_params params;
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char *cp;
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size_t n;
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if (want != NULL &&
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veriexec_get_pid_params(pid, ¶ms) == 0) {
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/* Does label contain [,]<want>[,] ? */
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if (params.labellen > 0 &&
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(cp = strstr(params.label, want)) != NULL) {
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if (cp == params.label || cp[-1] == ',') {
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n = strlen(want);
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if (cp[n] == '\0' || cp[n] == ',')
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return 1; /* yes */
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}
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}
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}
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return 0; /* no */
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}
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/**
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* @brief check if a path has label that contains what we want
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*
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* @return
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* @li 0 if no
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* @li 1 if yes
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*/
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int
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veriexec_check_path_label(const char *file, const char *want)
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{
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struct mac_veriexec_syscall_params params;
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char *cp;
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size_t n;
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if (want != NULL && file != NULL &&
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veriexec_get_path_params(file, ¶ms) == 0) {
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/* Does label contain [,]<want>[,] ? */
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if (params.labellen > 0 &&
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(cp = strstr(params.label, want)) != NULL) {
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if (cp == params.label || cp[-1] == ',') {
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n = strlen(want);
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if (cp[n] == '\0' || cp[n] == ',')
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return 1; /* yes */
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}
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}
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}
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return 0; /* no */
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}
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#ifdef UNIT_TEST
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#include <stdlib.h>
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#include <stdio.h>
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#include <err.h>
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static char *
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hash2hex(char *type, unsigned char *digest)
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{
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static char buf[2*MAXFINGERPRINTLEN+1];
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size_t n;
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int i;
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if (strcmp(type, "SHA1") == 0) {
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n = 20;
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} else if (strcmp(type, "SHA256") == 0) {
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n = 32;
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} else if (strcmp(type, "SHA384") == 0) {
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n = 48;
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}
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for (i = 0; i < n; i++) {
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sprintf(&buf[2*i], "%02x", (unsigned)digest[i]);
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}
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return buf;
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}
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int
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main(int argc, char *argv[])
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{
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struct mac_veriexec_syscall_params params;
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pid_t pid;
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char *want = NULL;
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int pflag = 0;
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int error;
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int c;
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while ((c = getopt(argc, argv, "pw:")) != -1) {
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switch (c) {
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case 'p':
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pflag = 1;
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break;
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case 'w':
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want = optarg;
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break;
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default:
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break;
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}
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}
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for (; optind < argc; optind++) {
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if (pflag) {
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pid = atoi(argv[optind]);
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if (want) {
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error = veriexec_check_pid_label(pid, want);
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printf("pid=%d want='%s': %d\n",
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pid, want, error);
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continue;
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}
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error = veriexec_get_pid_params(pid, ¶ms);
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} else {
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error = veriexec_get_path_params(argv[optind], ¶ms);
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}
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if (error) {
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err(2, "%s, error=%d", argv[optind], error);
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}
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printf("arg=%s, type=%s, flags=%u, label='%s', fingerprint='%s'\n",
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argv[optind], params.fp_type, (unsigned)params.flags,
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params.label,
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hash2hex(params.fp_type, params.fingerprint));
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}
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return 0;
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}
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#endif
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