Fix logging intercepted commands to a log server in sudoers.

Only available when the server supports the subcommands capability.

plugins/sudoers/audit.c

@@ -43,7 +43,6 @@
 #endif
 
 #ifdef SUDOERS_LOG_CLIENT
-static struct client_closure *client_closure = NULL;
 static struct log_details audit_details;
 #endif
 char *audit_msg = NULL;
@@ -251,10 +250,19 @@ log_server_accept(char * const command_info[], char * const run_argv[],
     bool ret = false;
     debug_decl(log_server_accept, SUDOERS_DEBUG_PLUGIN);
 
-    /* Only send accept event to log server if I/O log plugin did not. */
-    if (SLIST_EMPTY(&def_log_servers) || def_log_input || def_log_output)
+    if (SLIST_EMPTY(&def_log_servers))
 	debug_return_bool(true);
 
+    if (ISSET(sudo_mode, MODE_POLICY_INTERCEPTED)) {
+	/* Older servers don't support multiple commands per session. */
+	if (!client_closure->subcommands)
+	    debug_return_bool(true);
+    } else {
+	/* Only send accept event to log server if I/O log plugin did not. */
+	if (def_log_input || def_log_output)
+	    debug_return_bool(true);
+    }
+
     if (sudo_gettime_real(&now) == -1) {
 	sudo_warn("%s", U_("unable to get time of day"));
 	goto done;
@@ -263,8 +271,19 @@ log_server_accept(char * const command_info[], char * const run_argv[],
 	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
 	goto done;
     }
-
     audit_to_eventlog(evlog, command_info, run_argv, run_envp);
+
+    if (client_closure != NULL) {
+	/* Use existing client closure. */
+	if (fmt_accept_message(client_closure, evlog)) {
+	    if (client_closure->write_ev->add(client_closure->write_ev,
+		    &client_closure->log_details->server_timeout) == -1) {
+		sudo_warn("%s", U_("unable to add event to queue"));
+		goto done;
+	    }
+	    ret = true;
+	}
+    } else {
 	if (!init_log_details(&audit_details, evlog))
 	    goto done;
 
@@ -273,6 +292,8 @@ log_server_accept(char * const command_info[], char * const run_argv[],
 	    SEND_ACCEPT, NULL, sudoers_audit.event_alloc);
 	if (client_closure != NULL)
 	    ret = true;
+    }
+
 done:
     debug_return_bool(ret);
 }

plugins/sudoers/iolog.c

@@ -64,9 +64,6 @@ static struct sudoers_io_operations {
 	const char **errstr);
 } io_operations;
 
-#ifdef SUDOERS_LOG_CLIENT
-static struct client_closure *client_closure;
-#endif
 static struct log_details iolog_details;
 static bool warned = false;
 static int iolog_dir_fd = -1;

plugins/sudoers/log_client.c

@@ -63,6 +63,9 @@
 #include "hostcheck.h"
 #include "log_client.h"
 
+/* Shared between iolog.c and audit.c */
+struct client_closure *client_closure;
+
 /* Server callback may redirect to client callback for TLS. */
 static void client_msg_cb(int fd, int what, void *v);
 static void server_msg_cb(int fd, int what, void *v);
@@ -698,6 +701,9 @@ fmt_client_message(struct client_closure *closure, ClientMessage *msg)
     msg_len = htonl((uint32_t)len);
     len += sizeof(msg_len);
 
+    sudo_debug_printf(SUDO_DEBUG_INFO, "%s: new ClientMessage, %zu bytes",
+	__func__, len);
+
     /* Resize buffer as needed. */
     if (len > buf->size) {
 	free(buf->data);
@@ -775,10 +781,9 @@ free_info_messages(InfoMessage **info_msgs, size_t n)
 }
 
 static InfoMessage **
-fmt_info_messages(struct client_closure *closure, size_t *n_info_msgs)
+fmt_info_messages(struct client_closure *closure, struct eventlog *evlog,
+    size_t *n_info_msgs)
 {
-    struct log_details *details = closure->log_details;
-    struct eventlog *evlog = details->evlog;
     InfoMessage__StringList *runargv = NULL;
     InfoMessage__StringList *runenv = NULL;
     InfoMessage **info_msgs = NULL;
@@ -945,8 +950,8 @@ bad:
  * Appends the wire format message to the closure's write queue.
  * Returns true on success, false on failure.
  */
-static bool
-fmt_accept_message(struct client_closure *closure)
+bool
+fmt_accept_message(struct client_closure *closure, struct eventlog *evlog)
 {
     ClientMessage client_msg = CLIENT_MESSAGE__INIT;
     AcceptMessage accept_msg = ACCEPT_MESSAGE__INIT;
@@ -969,7 +974,8 @@ fmt_accept_message(struct client_closure *closure)
     /* Client will send IoBuffer messages. */
     accept_msg.expect_iobufs = closure->log_io;
 
-    accept_msg.info_msgs = fmt_info_messages(closure, &accept_msg.n_info_msgs);
+    accept_msg.info_msgs = fmt_info_messages(closure, evlog,
+	&accept_msg.n_info_msgs);
     if (accept_msg.info_msgs == NULL)
 	goto done;
 
@@ -993,8 +999,8 @@ done:
  * Appends the wire format message to the closure's write queue.
  * Returns true on success, false on failure.
  */
-static bool
-fmt_reject_message(struct client_closure *closure)
+bool
+fmt_reject_message(struct client_closure *closure, struct eventlog *evlog)
 {
     ClientMessage client_msg = CLIENT_MESSAGE__INIT;
     RejectMessage reject_msg = REJECT_MESSAGE__INIT;
@@ -1017,7 +1023,8 @@ fmt_reject_message(struct client_closure *closure)
     /* Reason for rejecting the request. */
     reject_msg.reason = (char *)closure->reason;
 
-    reject_msg.info_msgs = fmt_info_messages(closure, &reject_msg.n_info_msgs);
+    reject_msg.info_msgs = fmt_info_messages(closure, evlog,
+	&reject_msg.n_info_msgs);
     if (reject_msg.info_msgs == NULL)
 	goto done;
 
@@ -1042,7 +1049,7 @@ done:
  * Returns true on success, false on failure.
  */
 static bool
-fmt_alert_message(struct client_closure *closure)
+fmt_alert_message(struct client_closure *closure, struct eventlog *evlog)
 {
     ClientMessage client_msg = CLIENT_MESSAGE__INIT;
     AlertMessage alert_msg = ALERT_MESSAGE__INIT;
@@ -1065,7 +1072,8 @@ fmt_alert_message(struct client_closure *closure)
     /* Reason for the alert. */
     alert_msg.reason = (char *)closure->reason;
 
-    alert_msg.info_msgs = fmt_info_messages(closure, &alert_msg.n_info_msgs);
+    alert_msg.info_msgs = fmt_info_messages(closure, evlog,
+	&alert_msg.n_info_msgs);
     if (alert_msg.info_msgs == NULL)
 	goto done;
 
@@ -1100,7 +1108,7 @@ fmt_initial_message(struct client_closure *closure)
     switch (closure->state) {
     case SEND_ACCEPT:
 	/* Format and schedule AcceptMessage. */
-	if ((ret = fmt_accept_message(closure))) {
+	if ((ret = fmt_accept_message(closure, closure->log_details->evlog))) {
 	    /*
 	     * Move read/write events back to main sudo event loop.
 	     * Server messages may occur at any time, so no timeout.
@@ -1116,11 +1124,11 @@ fmt_initial_message(struct client_closure *closure)
 	break;
     case SEND_REJECT:
 	/* Format and schedule RejectMessage. */
-	ret = fmt_reject_message(closure);
+	ret = fmt_reject_message(closure, closure->log_details->evlog);
 	break;
     case SEND_ALERT:
 	/* Format and schedule AlertMessage. */
-	ret = fmt_alert_message(closure);
+	ret = fmt_alert_message(closure, closure->log_details->evlog);
 	break;
     default:
 	sudo_warnx(U_("%s: unexpected state %d"), __func__, closure->state);
@@ -1490,6 +1498,9 @@ handle_server_hello(ServerHello *msg, struct client_closure *closure)
 	    __func__, n + 1, msg->servers[n]);
     }
 
+    /* Does the server support logging sub-commands in a session? */
+    closure->subcommands = msg->subcommands;
+
     debug_return_bool(true);
 }
 

plugins/sudoers/log_client.h

@@ -94,6 +94,7 @@ struct client_closure {
     SSL *ssl;
     bool ssl_initialized;
 #endif /* HAVE_OPENSSL */
+    bool subcommands;
     enum client_state state;
     enum client_state initial_state; /* XXX - bad name */
     struct connection_buffer_list write_bufs;
@@ -113,6 +114,8 @@ struct client_closure {
 struct client_closure *log_server_open(struct log_details *details, struct timespec *now, bool log_io, enum client_state initial_state, const char *reason, struct sudo_plugin_event * (*event_alloc)(void));
 bool log_server_close(struct client_closure *closure, int exit_status, int error);
 bool fmt_client_message(struct client_closure *closure, ClientMessage *msg);
+bool fmt_accept_message(struct client_closure *closure, struct eventlog *evlog);
+bool fmt_reject_message(struct client_closure *closure, struct eventlog *evlog);
 bool fmt_exit_message(struct client_closure *closure, int exit_status, int error);
 bool fmt_io_buf(struct client_closure *closure, int type, const char *buf, unsigned int len, struct timespec *delay);
 bool fmt_suspend(struct client_closure *closure, const char *signame, struct timespec *delay);
@@ -120,5 +123,6 @@ bool fmt_winsize(struct client_closure *closure, unsigned int lines, unsigned in
 bool log_server_connect(struct client_closure *closure);
 void client_closure_free(struct client_closure *closure);
 bool read_server_hello(struct client_closure *closure);
+extern struct client_closure *client_closure;
 
 #endif /* SUDOERS_LOG_CLIENT_H */

plugins/sudoers/logging.c

@@ -121,20 +121,35 @@ bool
 log_server_reject(struct eventlog *evlog, const char *message,
     struct sudo_plugin_event * (*event_alloc)(void))
 {
-    struct client_closure *client_closure;
-    struct log_details details;
     bool ret = false;
     debug_decl(log_server_reject, SUDOERS_DEBUG_LOGGING);
 
     if (SLIST_EMPTY(&def_log_servers))
 	debug_return_bool(true);
 
+    if (client_closure != NULL) {
+	/* Older servers don't support multiple commands per session. */
+	if (!client_closure->subcommands)
+	    debug_return_bool(true);
+
+	/* Use existing client closure. */
+        if (fmt_reject_message(client_closure, evlog)) {
+            if (client_closure->write_ev->add(client_closure->write_ev,
+                    &client_closure->log_details->server_timeout) == -1) {
+                sudo_warn("%s", U_("unable to add event to queue"));
+                goto done;
+            }
+            ret = true;
+        }
+    } else {
+	struct log_details details;
+
 	if (!init_log_details(&details, evlog))
 	    debug_return_bool(false);
 
 	/* Open connection to log server, send hello and reject messages. */
-    client_closure = log_server_open(&details, &sudo_user.submit_time, false,
-	SEND_REJECT, message, event_alloc);
+	client_closure = log_server_open(&details, &sudo_user.submit_time,
+	    false, SEND_REJECT, message, event_alloc);
 	if (client_closure != NULL) {
 	    client_closure_free(client_closure);
 	    ret = true;
@@ -142,6 +157,9 @@ log_server_reject(struct eventlog *evlog, const char *message,
 
 	/* Only the log_servers string list is dynamically allocated. */
 	str_list_free(details.log_servers);
+    }
+
+done:
     debug_return_bool(ret);
 }
 
@@ -150,7 +168,6 @@ log_server_alert(struct eventlog *evlog, struct timespec *now,
     const char *message, const char *errstr,
     struct sudo_plugin_event * (*event_alloc)(void))
 {
-    struct client_closure *client_closure;
     struct log_details details;
     char *emessage = NULL;
     bool ret = false;
@@ -159,9 +176,6 @@ log_server_alert(struct eventlog *evlog, struct timespec *now,
     if (SLIST_EMPTY(&def_log_servers))
 	debug_return_bool(true);
 
-    if (!init_log_details(&details, evlog))
-	goto done;
-
     if (errstr != NULL) {
 	if (asprintf(&emessage, _("%s: %s"), message, errstr) == -1) {
 	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
@@ -169,6 +183,24 @@ log_server_alert(struct eventlog *evlog, struct timespec *now,
 	}
     }
 
+    if (client_closure != NULL) {
+	/* Older servers don't support multiple commands per session. */
+	if (!client_closure->subcommands)
+	    debug_return_bool(true);
+
+	/* Use existing client closure. */
+        if (fmt_reject_message(client_closure, evlog)) {
+            if (client_closure->write_ev->add(client_closure->write_ev,
+                    &client_closure->log_details->server_timeout) == -1) {
+                sudo_warn("%s", U_("unable to add event to queue"));
+                goto done;
+            }
+            ret = true;
+        }
+    } else {
+	if (!init_log_details(&details, evlog))
+	    goto done;
+
 	/* Open connection to log server, send hello and alert messages. */
 	client_closure = log_server_open(&details, now, false,
 	    SEND_ALERT, emessage ? emessage : message, event_alloc);
@@ -177,10 +209,12 @@ log_server_alert(struct eventlog *evlog, struct timespec *now,
 	    ret = true;
 	}
 
-done:
 	/* Only the log_servers string list is dynamically allocated. */
-    free(emessage);
 	str_list_free(details.log_servers);
+    }
+
+done:
+    free(emessage);
     debug_return_bool(ret);
 }
 #else