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/*
* lpass process settings
*
* Copyright (C) 2014-2018 LastPass.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
*
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*
* See LICENSE.OpenSSL for more details regarding this exception.
*/
#include "process.h"
#include "util.h"
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <limits.h>
#if defined(__linux__)
#include <sys/prctl.h>
#define USE_PRCTL
#elif defined(__APPLE__) && defined(__MACH__)
#include <libproc.h>
#include <sys/ptrace.h>
#define USE_PTRACE
#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
#elif defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <kvm.h>
#endif
#ifndef USE_PRCTL
#undef PR_SET_DUMPABLE
#define PR_SET_DUMPABLE 0
#define PR_SET_NAME 0
static void prctl(__attribute__((unused)) int x,
__attribute__((unused)) unsigned long y) {}
#endif
#ifndef USE_PTRACE
#undef PT_DENY_ATTACH
#define PT_DENY_ATTACH 0
static void ptrace(__attribute__((unused)) int x,
__attribute__((unused)) int y,
__attribute__((unused)) int z,
__attribute__((unused)) int w) {}
#endif
#if defined(__linux__) || defined(__CYGWIN__) || (defined(__NetBSD__) && !defined(KERN_PROC_PATHNAME))
static int pid_to_cmd(pid_t pid, char *cmd, size_t cmd_size)
{
_cleanup_free_ char *proc;
xasprintf(&proc, "/proc/%lu/exe", (unsigned long)pid);
return readlink(proc, cmd, cmd_size - 1);
}
#elif defined(__APPLE__) && defined(__MACH__)
static int pid_to_cmd(pid_t pid, char *cmd, size_t cmd_size)
{
int result;
result = proc_pidpath(pid, cmd, cmd_size);
return (result <= 0) ? -1 : 0;
}
#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
static int pid_to_cmd(pid_t pid, char *cmd, size_t cmd_size)
{
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, pid };
return sysctl(mib, 4, cmd, &cmd_size, NULL, 0);
}
#elif defined(__OpenBSD__)
static int pid_to_cmd(pid_t pid, char *cmd, size_t cmd_size)
{
int cnt, ret;
kvm_t *kd;
struct kinfo_proc *kp;
ret = -1;
if ((kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL)) == NULL)
return ret;
if ((kp = kvm_getprocs(kd, KERN_PROC_PID, (int)pid, sizeof(*kp), &cnt)) == NULL)
goto out;
if ((kp->p_flag & P_SYSTEM) != 0)
goto out;
if (cnt != 1)
goto out;
if (strlcpy(cmd, kp[0].p_comm, cmd_size) >= cmd_size)
goto out;
ret = 0;
out:
kvm_close(kd);
return ret;
}
#else
#error "Please provide a pid_to_cmd for your platform"
#endif
int ARGC;
char **ARGV;
void process_set_name(const char *name)
{
size_t argslen = 0;
prctl(PR_SET_NAME, (unsigned long) name);
if (!ARGC || !ARGV)
return;
for (int i = 0; i < ARGC; ++i) {
argslen += strlen(ARGV[i]) + 1;
for (char *p = ARGV[i]; *p; ++p)
*p = '\0';
}
strlcpy(ARGV[0], name, argslen);
}
bool process_is_same_executable(pid_t pid)
{
char resolved_them[PATH_MAX + 1] = { 0 }, resolved_me[PATH_MAX + 1] = { 0 };
if (pid_to_cmd(pid, resolved_them, sizeof(resolved_them)) < 0 ||
pid_to_cmd(getpid(), resolved_me, sizeof(resolved_me)) < 0)
return false;
return strcmp(resolved_them, resolved_me) == 0;
}
void process_disable_ptrace(void)
{
prctl(PR_SET_DUMPABLE, 0);
ptrace(PT_DENY_ATTACH, 0, 0, 0);
struct rlimit limit = { 0, 0 };
setrlimit(RLIMIT_CORE, &limit);
}
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