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From b54a16e1749fc53e4ed047da72f97b8f99bf4d6a Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@sudo.ws>
Date: Fri, 9 Jul 2021 11:08:44 -0600
Subject: [PATCH] Add support for logging exit status events. For
sudo-formatted logs, this is a record with "EXIT=number" and potentially
"SIGNAL=name" after the command. For JSON-format logs, a new "exit" record
is logged which contains an "exit_value" and potentially "signal" and
"core_dumped". JSON-format logs now incude a UUID to associate the "exit"
record with the "accept" record.
---
include/sudo_eventlog.h | 2 +
lib/eventlog/eventlog.c | 255 +++++++++++++++++++++++++++-------------
2 files changed, 175 insertions(+), 82 deletions(-)
diff --git a/include/sudo_eventlog.h b/include/sudo_eventlog.h
index 49153e173..07ef9dcbe 100644
--- a/include/sudo_eventlog.h
+++ b/include/sudo_eventlog.h
@@ -31,6 +31,7 @@
enum event_type {
EVLOG_ACCEPT,
EVLOG_REJECT,
+ EVLOG_EXIT,
EVLOG_ALERT
};
@@ -122,6 +123,7 @@ struct json_container;
typedef bool (*eventlog_json_callback_t)(struct json_container *, void *);
bool eventlog_accept(const struct eventlog *evlog, int flags, eventlog_json_callback_t info_cb, void *info);
+bool eventlog_exit(const struct eventlog *evlog, int flags, struct timespec *run_time, int exit_value, const char *signal_name, bool core_dumped, eventlog_json_callback_t info_cb, void *info);
bool eventlog_alert(const struct eventlog *evlog, int flags, struct timespec *alert_time, const char *reason, const char *errstr);
bool eventlog_reject(const struct eventlog *evlog, int flags, const char *reason, eventlog_json_callback_t info_cb, void *info);
bool eventlog_store_json(struct json_container *json, const struct eventlog *evlog);
diff --git a/lib/eventlog/eventlog.c b/lib/eventlog/eventlog.c
index 0c1e74e38..efcd6859d 100644
--- a/lib/eventlog/eventlog.c
+++ b/lib/eventlog/eventlog.c
@@ -66,6 +66,8 @@
#define LL_ENV_STR "ENV="
#define LL_CMND_STR "COMMAND="
#define LL_TSID_STR "TSID="
+#define LL_EXIT_STR "EXIT="
+#define LL_SIGNAL_STR "SIGNAL="
#define IS_SESSID(s) ( \
isalnum((unsigned char)(s)[0]) && isalnum((unsigned char)(s)[1]) && \
@@ -75,28 +77,40 @@
isalnum((unsigned char)(s)[6]) && isalnum((unsigned char)(s)[7]) && \
(s)[8] == '\0')
+struct eventlog_args {
+ const char *reason;
+ const char *errstr;
+ const char *signal_name;
+ const struct timespec *event_time;
+ int exit_value;
+ bool core_dumped;
+ eventlog_json_callback_t json_info_cb;
+ void *json_info;
+};
+
/*
* Allocate and fill in a new logline.
*/
static char *
-new_logline(int flags, const char *message, const char *errstr,
+new_logline(int event_type, int flags, struct eventlog_args *args,
const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
char *line = NULL, *evstr = NULL;
const char *iolog_file = evlog->iolog_file;
const char *tty, *tsid = NULL;
+ char exit_str[(((sizeof(int) * 8) + 2) / 3) + 2];
char sessid[7];
size_t len = 0;
int i;
debug_decl(new_logline, SUDO_DEBUG_UTIL);
if (ISSET(flags, EVLOG_RAW)) {
- if (errstr != NULL) {
- if (asprintf(&line, "%s: %s", message, errstr) == -1)
+ if (args->errstr != NULL) {
+ if (asprintf(&line, "%s: %s", args->reason, args->errstr) == -1)
goto oom;
} else {
- if ((line = strdup(message)) == NULL)
+ if ((line = strdup(args->reason)) == NULL)
goto oom;
}
debug_return_str(line);
@@ -127,10 +141,10 @@ new_logline(int flags, const char *message, const char *errstr,
/*
* Compute line length
*/
- if (message != NULL)
- len += strlen(message) + 3;
- if (errstr != NULL)
- len += strlen(errstr) + 3;
+ if (args->reason != NULL)
+ len += strlen(args->reason) + 3;
+ if (args->errstr != NULL)
+ len += strlen(args->errstr) + 3;
if (evlog->submithost != NULL && !evl_conf->omit_hostname)
len += sizeof(LL_HOST_STR) + 2 + strlen(evlog->submithost);
if (tty != NULL)
@@ -171,6 +185,12 @@ new_logline(int flags, const char *message, const char *errstr,
for (i = 1; evlog->argv[i] != NULL; i++)
len += strlen(evlog->argv[i]) + 1;
}
+ if (event_type == EVLOG_EXIT) {
+ if (args->signal_name != NULL)
+ len += sizeof(LL_SIGNAL_STR) + 2 + strlen(args->signal_name);
+ (void)snprintf(exit_str, sizeof(exit_str), "%d", args->exit_value);
+ len += sizeof(LL_EXIT_STR) + 2 + strlen(exit_str);
+ }
}
/*
@@ -180,13 +200,13 @@ new_logline(int flags, const char *message, const char *errstr,
goto oom;
line[0] = '\0';
- if (message != NULL) {
- if (strlcat(line, message, len) >= len ||
- strlcat(line, errstr ? " : " : " ; ", len) >= len)
+ if (args->reason != NULL) {
+ if (strlcat(line, args->reason, len) >= len ||
+ strlcat(line, args->errstr ? " : " : " ; ", len) >= len)
goto toobig;
}
- if (errstr != NULL) {
- if (strlcat(line, errstr, len) >= len ||
+ if (args->errstr != NULL) {
+ if (strlcat(line, args->errstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
}
@@ -252,6 +272,18 @@ new_logline(int flags, const char *message, const char *errstr,
goto toobig;
}
}
+ if (event_type == EVLOG_EXIT) {
+ if (args->signal_name != NULL) {
+ if (strlcat(line, " ; ", len) >= len ||
+ strlcat(line, LL_SIGNAL_STR, len) >= len ||
+ strlcat(line, args->signal_name, len) >= len)
+ goto toobig;
+ }
+ if (strlcat(line, " ; ", len) >= len ||
+ strlcat(line, LL_EXIT_STR, len) >= len ||
+ strlcat(line, exit_str, len) >= len)
+ goto toobig;
+ }
}
debug_return_str(line);
@@ -369,7 +401,7 @@ exec_mailer(int pipein)
_exit(127);
}
-/* Send a message to MAILTO user */
+/* Send a message to the mailto user */
static bool
send_mail(const struct eventlog *evlog, const char *fmt, ...)
{
@@ -548,19 +580,11 @@ send_mail(const struct eventlog *evlog, const char *fmt, ...)
static bool
json_add_timestamp(struct json_container *json, const char *name,
- const struct timespec *ts)
+ const struct timespec *ts, bool format_timestamp)
{
- const struct eventlog_config *evl_conf = eventlog_getconf();
- const char *timefmt = evl_conf->time_fmt;
struct json_value json_value;
- time_t secs = ts->tv_sec;
- char timebuf[1024];
- struct tm *tm;
debug_decl(json_add_timestamp, SUDO_DEBUG_PLUGIN);
- if ((tm = gmtime(&secs)) == NULL)
- debug_return_bool(false);
-
if (!sudo_json_open_object(json, name))
goto oom;
@@ -574,17 +598,27 @@ json_add_timestamp(struct json_container *json, const char *name,
if (!sudo_json_add_value(json, "nanoseconds", &json_value))
goto oom;
- strftime(timebuf, sizeof(timebuf), "%Y%m%d%H%M%SZ", tm);
- json_value.type = JSON_STRING;
- json_value.u.string = timebuf;
- if (!sudo_json_add_value(json, "iso8601", &json_value))
- goto oom;
+ if (format_timestamp) {
+ const struct eventlog_config *evl_conf = eventlog_getconf();
+ const char *timefmt = evl_conf->time_fmt;
+ time_t secs = ts->tv_sec;
+ char timebuf[1024];
+ struct tm *tm;
- strftime(timebuf, sizeof(timebuf), timefmt, tm);
- json_value.type = JSON_STRING;
- json_value.u.string = timebuf;
- if (!sudo_json_add_value(json, "localtime", &json_value))
- goto oom;
+ if ((tm = gmtime(&secs)) != NULL) {
+ strftime(timebuf, sizeof(timebuf), "%Y%m%d%H%M%SZ", tm);
+ json_value.type = JSON_STRING;
+ json_value.u.string = timebuf;
+ if (!sudo_json_add_value(json, "iso8601", &json_value))
+ goto oom;
+
+ strftime(timebuf, sizeof(timebuf), timefmt, tm);
+ json_value.type = JSON_STRING;
+ json_value.u.string = timebuf;
+ if (!sudo_json_add_value(json, "localtime", &json_value))
+ goto oom;
+ }
+ }
if (!sudo_json_close_object(json))
goto oom;
@@ -741,14 +775,15 @@ default_json_cb(struct json_container *json, void *v)
}
static char *
-format_json(int event_type, const char *reason, const char *errstr,
- const struct eventlog *evlog, const struct timespec *event_time,
- eventlog_json_callback_t info_cb, void *info, bool compact)
+format_json(int event_type, struct eventlog_args *args,
+ const struct eventlog *evlog, bool compact)
{
- const char *type_str;
- const char *time_str;
+ eventlog_json_callback_t info_cb = args->json_info_cb;
+ void *info = args->json_info;
struct json_container json = { 0 };
struct json_value json_value;
+ const char *time_str, *type_str;
+ bool format_timestamp = true;
struct timespec now;
debug_decl(format_json, SUDO_DEBUG_UTIL);
@@ -776,6 +811,11 @@ format_json(int event_type, const char *reason, const char *errstr,
type_str = "alert";
time_str = "alert_time";
break;
+ case EVLOG_EXIT:
+ type_str = "exit";
+ time_str = "run_time";
+ format_timestamp = false;
+ break;
default:
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unexpected event type %d", event_type);
@@ -788,18 +828,20 @@ format_json(int event_type, const char *reason, const char *errstr,
goto bad;
/* Reject and Alert events include a reason and optional error string. */
- if (reason != NULL) {
+ if (args->reason != NULL) {
char *ereason = NULL;
- if (errstr != NULL) {
- if (asprintf(&ereason, _("%s: %s"), reason, errstr) == -1) {
+ if (args->errstr != NULL) {
+ const int len = asprintf(&ereason, _("%s: %s"), args->reason,
+ args->errstr);
+ if (len == -1) {
sudo_warnx(U_("%s: %s"), __func__,
U_("unable to allocate memory"));
goto bad;
}
}
json_value.type = JSON_STRING;
- json_value.u.string = ereason ? ereason : reason;
+ json_value.u.string = ereason ? ereason : args->reason;
if (!sudo_json_add_value(&json, "reason", &json_value)) {
free(ereason);
goto bad;
@@ -810,19 +852,37 @@ format_json(int event_type, const char *reason, const char *errstr,
/* XXX - create and log uuid? */
/* Log event time on server (set earlier) */
- if (!json_add_timestamp(&json, "server_time", &now)) {
+ if (!json_add_timestamp(&json, "server_time", &now, true)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"unable format timestamp");
goto bad;
}
/* Log event time from client */
- if (!json_add_timestamp(&json, time_str, event_time)) {
+ if (!json_add_timestamp(&json, time_str, args->event_time, format_timestamp)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"unable format timestamp");
goto bad;
}
+ if (event_type == EVLOG_EXIT) {
+ if (args->signal_name != NULL) {
+ json_value.type = JSON_STRING;
+ json_value.u.string = args->signal_name;
+ if (!sudo_json_add_value(&json, "signal", &json_value))
+ goto bad;
+
+ json_value.type = JSON_BOOL;
+ json_value.u.boolean = args->signal_name;
+ if (!sudo_json_add_value(&json, "dumped_core", &json_value))
+ goto bad;
+ }
+ json_value.type = JSON_NUMBER;
+ json_value.u.number = args->exit_value;
+ if (!sudo_json_add_value(&json, "exit_value", &json_value))
+ goto bad;
+ }
+
/* Event log info may be missing for alert messages. */
if (evlog != NULL) {
if (evlog->peeraddr != NULL) {
@@ -919,18 +979,15 @@ done:
}
static bool
-do_syslog_json(int pri, int event_type, const char *reason,
- const char *errstr, const struct eventlog *evlog,
- const struct timespec *event_time,
- eventlog_json_callback_t info_cb, void *info)
+do_syslog_json(int pri, int event_type, struct eventlog_args *args,
+ const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
char *json_str;
debug_decl(do_syslog_json, SUDO_DEBUG_UTIL);
/* Format as a compact JSON message (no newlines) */
- json_str = format_json(event_type, reason, errstr, evlog, event_time,
- info_cb, info, true);
+ json_str = format_json(event_type, args, evlog, true);
if (json_str == NULL)
debug_return_bool(false);
@@ -947,9 +1004,8 @@ do_syslog_json(int pri, int event_type, const char *reason,
* Log a message to syslog in either sudo or JSON format.
*/
static bool
-do_syslog(int event_type, int flags, const char *reason, const char *errstr,
- const struct eventlog *evlog, const struct timespec *event_time,
- eventlog_json_callback_t info_cb, void *info)
+do_syslog(int event_type, int flags, struct eventlog_args *args,
+ const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
char *logline = NULL;
@@ -959,7 +1015,7 @@ do_syslog(int event_type, int flags, const char *reason, const char *errstr,
/* Sudo format logs and mailed logs use the same log line format. */
if (evl_conf->format == EVLOG_SUDO || ISSET(flags, EVLOG_MAIL)) {
- logline = new_logline(flags, reason, errstr, evlog);
+ logline = new_logline(event_type, flags, args, evlog);
if (logline == NULL)
debug_return_bool(false);
@@ -977,6 +1033,7 @@ do_syslog(int event_type, int flags, const char *reason, const char *errstr,
switch (event_type) {
case EVLOG_ACCEPT:
+ case EVLOG_EXIT:
pri = evl_conf->syslog_acceptpri;
break;
case EVLOG_REJECT:
@@ -1002,8 +1059,7 @@ do_syslog(int event_type, int flags, const char *reason, const char *errstr,
ret = do_syslog_sudo(pri, logline, evlog);
break;
case EVLOG_JSON:
- ret = do_syslog_json(pri, event_type, reason, errstr, evlog,
- event_time, info_cb, info);
+ ret = do_syslog_json(pri, event_type, args, evlog);
break;
default:
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
@@ -1069,9 +1125,8 @@ done:
}
static bool
-do_logfile_json(int event_type, const char *reason, const char *errstr,
- const struct eventlog *evlog, const struct timespec *event_time,
- eventlog_json_callback_t info_cb, void *info)
+do_logfile_json(int event_type, struct eventlog_args *args,
+ const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
const char *logfile = evl_conf->logpath;
@@ -1084,8 +1139,7 @@ do_logfile_json(int event_type, const char *reason, const char *errstr,
if ((fp = evl_conf->open_log(EVLOG_FILE, logfile)) == NULL)
debug_return_bool(false);
- json_str = format_json(event_type, reason, errstr, evlog, event_time,
- info_cb, info, false);
+ json_str = format_json(event_type, args, evlog, false);
if (json_str == NULL)
goto done;
@@ -1127,9 +1181,8 @@ done:
}
static bool
-do_logfile(int event_type, int flags, const char *reason, const char *errstr,
- const struct eventlog *evlog, const struct timespec *event_time,
- eventlog_json_callback_t info_cb, void *info)
+do_logfile(int event_type, int flags, struct eventlog_args *args,
+ const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
bool ret = false;
@@ -1138,7 +1191,7 @@ do_logfile(int event_type, int flags, const char *reason, const char *errstr,
/* Sudo format logs and mailed logs use the same log line format. */
if (evl_conf->format == EVLOG_SUDO || ISSET(flags, EVLOG_MAIL)) {
- logline = new_logline(flags, reason, errstr, evlog);
+ logline = new_logline(event_type, flags, args, evlog);
if (logline == NULL)
debug_return_bool(false);
@@ -1156,11 +1209,11 @@ do_logfile(int event_type, int flags, const char *reason, const char *errstr,
switch (evl_conf->format) {
case EVLOG_SUDO:
- ret = do_logfile_sudo(logline ? logline : reason, evlog, event_time);
+ ret = do_logfile_sudo(logline ? logline : args->reason, evlog,
+ args->event_time);
break;
case EVLOG_JSON:
- ret = do_logfile_json(event_type, reason, errstr, evlog,
- event_time, info_cb, info);
+ ret = do_logfile_json(event_type, args, evlog);
break;
default:
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
@@ -1178,21 +1231,21 @@ eventlog_accept(const struct eventlog *evlog, int flags,
{
const struct eventlog_config *evl_conf = eventlog_getconf();
const int log_type = evl_conf->type;
+ struct eventlog_args args = { NULL };
bool ret = true;
debug_decl(log_accept, SUDO_DEBUG_UTIL);
- if (log_type == EVLOG_NONE)
- debug_return_bool(true);
+ args.event_time = &evlog->submit_time;
+ args.json_info_cb = info_cb;
+ args.json_info = info;
if (ISSET(log_type, EVLOG_SYSLOG)) {
- if (!do_syslog(EVLOG_ACCEPT, flags, NULL, NULL, evlog,
- &evlog->submit_time, info_cb, info))
+ if (!do_syslog(EVLOG_ACCEPT, flags, &args, evlog))
ret = false;
CLR(flags, EVLOG_MAIL);
}
if (ISSET(log_type, EVLOG_FILE)) {
- if (!do_logfile(EVLOG_ACCEPT, flags, NULL, NULL, evlog,
- &evlog->submit_time, info_cb, info))
+ if (!do_logfile(EVLOG_ACCEPT, flags, &args, evlog))
ret = false;
}
@@ -1205,18 +1258,22 @@ eventlog_reject(const struct eventlog *evlog, int flags, const char *reason,
{
const struct eventlog_config *evl_conf = eventlog_getconf();
const int log_type = evl_conf->type;
+ struct eventlog_args args = { NULL };
bool ret = true;
debug_decl(log_reject, SUDO_DEBUG_UTIL);
+ args.reason = reason;
+ args.event_time = &evlog->submit_time;
+ args.json_info_cb = info_cb;
+ args.json_info = info;
+
if (ISSET(log_type, EVLOG_SYSLOG)) {
- if (!do_syslog(EVLOG_REJECT, flags, reason, NULL, evlog,
- &evlog->submit_time, info_cb, info))
+ if (!do_syslog(EVLOG_REJECT, flags, &args, evlog))
ret = false;
CLR(flags, EVLOG_MAIL);
}
if (ISSET(log_type, EVLOG_FILE)) {
- if (!do_logfile(EVLOG_REJECT, flags, reason, NULL, evlog,
- &evlog->submit_time, info_cb, info))
+ if (!do_logfile(EVLOG_REJECT, flags, &args, evlog))
ret = false;
}
@@ -1229,18 +1286,52 @@ eventlog_alert(const struct eventlog *evlog, int flags,
{
const struct eventlog_config *evl_conf = eventlog_getconf();
const int log_type = evl_conf->type;
+ struct eventlog_args args = { NULL };
bool ret = true;
debug_decl(log_alert, SUDO_DEBUG_UTIL);
+ args.reason = reason;
+ args.errstr = errstr;
+ args.event_time = alert_time;
+
+ if (ISSET(log_type, EVLOG_SYSLOG)) {
+ if (!do_syslog(EVLOG_ALERT, flags, &args, evlog))
+ ret = false;
+ CLR(flags, EVLOG_MAIL);
+ }
+ if (ISSET(log_type, EVLOG_FILE)) {
+ if (!do_logfile(EVLOG_ALERT, flags, &args, evlog))
+ ret = false;
+ }
+
+ debug_return_bool(ret);
+}
+
+bool
+eventlog_exit(const struct eventlog *evlog, int flags,
+ struct timespec *run_time, int exit_value, const char *signal_name,
+ bool core_dumped, eventlog_json_callback_t info_cb, void *info)
+{
+ const struct eventlog_config *evl_conf = eventlog_getconf();
+ const int log_type = evl_conf->type;
+ struct eventlog_args args = { NULL };
+ bool ret = true;
+ debug_decl(eventlog_exit, SUDO_DEBUG_UTIL);
+
+ args.signal_name = signal_name;
+ args.core_dumped = core_dumped;
+ args.exit_value = exit_value;
+ args.event_time = run_time;
+ args.json_info_cb = info_cb;
+ args.json_info = info;
+
if (ISSET(log_type, EVLOG_SYSLOG)) {
- if (!do_syslog(EVLOG_ALERT, flags, reason, errstr, evlog, alert_time,
- NULL, NULL))
+ if (!do_syslog(EVLOG_EXIT, flags, &args, evlog))
ret = false;
CLR(flags, EVLOG_MAIL);
}
if (ISSET(log_type, EVLOG_FILE)) {
- if (!do_logfile(EVLOG_ALERT, flags, reason, errstr, evlog, alert_time,
- NULL, NULL))
+ if (!do_logfile(EVLOG_EXIT, flags, &args, evlog))
ret = false;
}
--
2.43.0
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