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