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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2012-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
/* Large files not supported by procfs.h on Solaris. */
#if defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
# undef _FILE_OFFSET_BITS
# undef _LARGE_FILES
#endif
#include <sys/types.h>
#include <sys/stat.h>
#if defined(HAVE_KINFO_PROC_44BSD) || defined (HAVE_KINFO_PROC_OPENBSD) || defined(HAVE_KINFO_PROC2_NETBSD)
# include <sys/sysctl.h>
#elif defined(HAVE_KINFO_PROC_FREEBSD)
# include <sys/param.h>
# include <sys/sysctl.h>
# include <sys/user.h>
#endif
#if defined(HAVE_PROCFS_H)
# include <procfs.h>
#elif defined(HAVE_SYS_PROCFS_H)
# include <sys/procfs.h>
#endif
#ifdef HAVE_PSTAT_GETPROC
# include <sys/pstat.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include "sudoers.h"
#include "check.h"
/*
* Arguments for sysctl(2) when reading the process start time.
*/
#if defined(HAVE_KINFO_PROC2_NETBSD)
# define SUDO_KERN_PROC KERN_PROC2
# define sudo_kinfo_proc kinfo_proc2
# define sudo_kp_namelen 6
#elif defined(HAVE_KINFO_PROC_OPENBSD)
# define SUDO_KERN_PROC KERN_PROC
# define sudo_kinfo_proc kinfo_proc
# define sudo_kp_namelen 6
#elif defined(HAVE_KINFO_PROC_FREEBSD) || defined(HAVE_KINFO_PROC_44BSD)
# define SUDO_KERN_PROC KERN_PROC
# define sudo_kinfo_proc kinfo_proc
# define sudo_kp_namelen 4
#endif
/*
* Store start time of the specified process in starttime.
*/
#if defined(sudo_kinfo_proc)
int
get_starttime(pid_t pid, struct timespec *starttime)
{
struct sudo_kinfo_proc *ki_proc = NULL;
size_t size = sizeof(*ki_proc);
int mib[6], rc;
debug_decl(get_starttime, SUDOERS_DEBUG_UTIL);
/*
* Lookup start time for pid via sysctl.
*/
mib[0] = CTL_KERN;
mib[1] = SUDO_KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = (int)pid;
mib[4] = sizeof(*ki_proc);
mib[5] = 1;
for (;;) {
struct sudo_kinfo_proc *kp;
size += size / 10;
if ((kp = realloc(ki_proc, size)) == NULL) {
rc = -1;
break; /* really out of memory. */
}
ki_proc = kp;
rc = sysctl(mib, sudo_kp_namelen, ki_proc, &size, NULL, 0);
if (rc != -1 || errno != ENOMEM)
break;
}
if (rc != -1) {
#if defined(HAVE_KINFO_PROC_FREEBSD)
/* FreeBSD and Dragonfly */
TIMEVAL_TO_TIMESPEC(&ki_proc->ki_start, starttime);
#elif defined(HAVE_KINFO_PROC_44BSD)
/* 4.4BSD and macOS */
TIMEVAL_TO_TIMESPEC(&ki_proc->kp_proc.p_starttime, starttime);
#else
/* NetBSD and OpenBSD */
starttime->tv_sec = ki_proc->p_ustart_sec;
starttime->tv_nsec = ki_proc->p_ustart_usec * 1000;
#endif
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: start time for %d: { %lld, %ld }", __func__,
(int)pid, (long long)starttime->tv_sec, (long)starttime->tv_nsec);
} else {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to get start time for %d via KERN_PROC", (int)pid);
}
free(ki_proc);
debug_return_int(rc == -1 ? -1 : 0);
}
#elif defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
int
get_starttime(pid_t pid, struct timespec *starttime)
{
struct psinfo psinfo;
char path[PATH_MAX];
ssize_t nread;
int fd, ret = -1;
debug_decl(get_starttime, SUDOERS_DEBUG_UTIL);
/* Determine the start time from pr_start in /proc/pid/psinfo. */
(void)snprintf(path, sizeof(path), "/proc/%u/psinfo", (unsigned int)pid);
if ((fd = open(path, O_RDONLY, 0)) != -1) {
nread = read(fd, &psinfo, sizeof(psinfo));
close(fd);
if (nread == (ssize_t)sizeof(psinfo)) {
starttime->tv_sec = psinfo.pr_start.tv_sec;
starttime->tv_nsec = psinfo.pr_start.tv_nsec;
ret = 0;
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: start time for %d: { %lld, %ld }", __func__, (int)pid,
(long long)starttime->tv_sec, (long)starttime->tv_nsec);
}
}
if (ret == -1)
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to get start time for %d via %s", (int)pid, path);
debug_return_int(ret);
}
#elif defined(__linux__)
int
get_starttime(pid_t pid, struct timespec *starttime)
{
char path[PATH_MAX];
char *cp, buf[1024];
ssize_t nread;
int ret = -1;
int fd = -1;
long tps;
debug_decl(get_starttime, SUDOERS_DEBUG_UTIL);
/*
* Start time is in ticks per second on Linux.
*/
tps = sysconf(_SC_CLK_TCK);
if (tps == -1)
goto done;
/*
* Determine the start time from 22nd field in /proc/pid/stat.
* Ignore /proc/self/stat if it contains embedded NUL bytes.
* XXX - refactor common code with ttyname.c?
*/
(void)snprintf(path, sizeof(path), "/proc/%u/stat", (unsigned int)pid);
if ((fd = open(path, O_RDONLY | O_NOFOLLOW)) != -1) {
cp = buf;
while ((nread = read(fd, cp, buf + sizeof(buf) - cp)) != 0) {
if (nread == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
break;
}
cp += nread;
if (cp >= buf + sizeof(buf))
break;
}
if (nread == 0 && memchr(buf, '\0', cp - buf) == NULL) {
/*
* Field 22 is the start time (%ull).
* Since the process name at field 2 "(comm)" may include
* whitespace (including newlines), start at the last ')' found.
*/
*cp = '\0';
cp = strrchr(buf, ')');
if (cp != NULL) {
char *ep = cp;
int field = 1;
while (*++ep != '\0') {
if (*ep == ' ') {
if (++field == 22) {
unsigned long long ullval;
/* Must start with a digit (not negative). */
if (!isdigit((unsigned char)*cp)) {
errno = EINVAL;
goto done;
}
/* starttime is %ul in 2.4 and %ull in >= 2.6 */
errno = 0;
ullval = strtoull(cp, &ep, 10);
if (ep == cp || *ep != ' ') {
errno = EINVAL;
goto done;
}
if (errno == ERANGE && ullval == ULLONG_MAX)
goto done;
/* Convert from ticks to timespec */
starttime->tv_sec = ullval / tps;
starttime->tv_nsec =
(ullval % tps) * (1000000000 / tps);
ret = 0;
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: start time for %d: { %lld, %ld }",
__func__, (int)pid,
(long long)starttime->tv_sec,
(long)starttime->tv_nsec);
goto done;
}
cp = ep + 1;
}
}
}
}
}
errno = ENOENT;
done:
if (fd != -1)
close(fd);
if (ret == -1)
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to get start time for %d via %s", (int)pid, path);
debug_return_int(ret);
}
#elif defined(HAVE_PSTAT_GETPROC)
int
get_starttime(pid_t pid, struct timespec *starttime)
{
struct pst_status pst;
int rc;
debug_decl(get_starttime, SUDOERS_DEBUG_UTIL);
/*
* Determine the start time from pst_start in struct pst_status.
* EOVERFLOW is not a fatal error for the fields we use.
* See the "EOVERFLOW Error" section of pstat_getvminfo(3).
*/
rc = pstat_getproc(&pst, sizeof(pst), 0, pid);
if (rc != -1 || errno == EOVERFLOW) {
starttime->tv_sec = pst.pst_start;
starttime->tv_nsec = 0;
sudo_debug_printf(SUDO_DEBUG_INFO,
"%s: start time for %d: { %lld, %ld }", __func__,
(int)pid, (long long)starttime->tv_sec, (long)starttime->tv_nsec);
debug_return_int(0);
}
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to get start time for %d via pstat_getproc", (int)pid);
debug_return_int(-1);
}
#else
int
get_starttime(pid_t pid, struct timespec *starttime)
{
debug_decl(get_starttime, SUDOERS_DEBUG_UTIL);
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"process start time not supported by sudo on this system");
debug_return_int(-1);
}
#endif
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