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-rw-r--r--plugins/sudoers/starttime.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/plugins/sudoers/starttime.c b/plugins/sudoers/starttime.c
new file mode 100644
index 0000000..52ebac1
--- /dev/null
+++ b/plugins/sudoers/starttime.c
@@ -0,0 +1,311 @@
+/*
+ * 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) || defined(HAVE_KINFO_PROC_DFLY)
+# 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_DFLY) || 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. */
+ TIMEVAL_TO_TIMESPEC(&ki_proc->ki_start, starttime);
+#elif defined(HAVE_KINFO_PROC_DFLY)
+ /* Dragonfly. */
+ TIMEVAL_TO_TIMESPEC(&ki_proc->kp_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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