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-rw-r--r--logsrvd/logsrvd.c2012
1 files changed, 2012 insertions, 0 deletions
diff --git a/logsrvd/logsrvd.c b/logsrvd/logsrvd.c
new file mode 100644
index 0000000..17edb84
--- /dev/null
+++ b/logsrvd/logsrvd.c
@@ -0,0 +1,2012 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2019-2022 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>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif /* HAVE_STDBOOL_H */
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#ifdef HAVE_GETOPT_LONG
+# include <getopt.h>
+# else
+# include "compat/getopt.h"
+#endif /* HAVE_GETOPT_LONG */
+
+#define NEED_INET_NTOP /* to expose sudo_inet_ntop in sudo_compat.h */
+
+#include "pathnames.h"
+#include "sudo_compat.h"
+#include "sudo_conf.h"
+#include "sudo_debug.h"
+#include "sudo_event.h"
+#include "sudo_eventlog.h"
+#include "sudo_fatal.h"
+#include "sudo_gettext.h"
+#include "sudo_json.h"
+#include "sudo_iolog.h"
+#include "sudo_queue.h"
+#include "sudo_rand.h"
+#include "sudo_util.h"
+
+#include "logsrvd.h"
+#include "hostcheck.h"
+
+#ifndef O_NOFOLLOW
+# define O_NOFOLLOW 0
+#endif
+
+/*
+ * Sudo I/O audit server.
+ */
+static int logsrvd_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
+TAILQ_HEAD(connection_list, connection_closure);
+static struct connection_list connections = TAILQ_HEAD_INITIALIZER(connections);
+static struct listener_list listeners = TAILQ_HEAD_INITIALIZER(listeners);
+static const char server_id[] = "Sudo Audit Server " PACKAGE_VERSION;
+static const char *conf_file = _PATH_SUDO_LOGSRVD_CONF;
+
+/* Event loop callbacks. */
+static void client_msg_cb(int fd, int what, void *v);
+static void server_msg_cb(int fd, int what, void *v);
+static void server_commit_cb(int fd, int what, void *v);
+#if defined(HAVE_OPENSSL)
+static void tls_handshake_cb(int fd, int what, void *v);
+#endif
+
+/*
+ * Free a struct connection_closure container and its contents.
+ */
+static void
+connection_closure_free(struct connection_closure *closure)
+{
+ debug_decl(connection_closure_free, SUDO_DEBUG_UTIL);
+
+ if (closure != NULL) {
+ bool shutting_down = closure->state == SHUTDOWN;
+ struct sudo_event_base *evbase = closure->evbase;
+ struct connection_buffer *buf;
+
+ TAILQ_REMOVE(&connections, closure, entries);
+
+ if (closure->state == CONNECTING && closure->journal != NULL) {
+ /* Failed to relay journal file, retry later. */
+ logsrvd_queue_insert(closure);
+ }
+ if (closure->relay_closure != NULL)
+ relay_closure_free(closure->relay_closure);
+#if defined(HAVE_OPENSSL)
+ if (closure->ssl != NULL) {
+ /* Must call SSL_shutdown() before closing closure->sock. */
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "closing down TLS connection from %s", closure->ipaddr);
+ if (SSL_shutdown(closure->ssl) == 0)
+ SSL_shutdown(closure->ssl);
+ SSL_free(closure->ssl);
+ }
+#endif
+ if (closure->sock != -1) {
+ shutdown(closure->sock, SHUT_RDWR);
+ close(closure->sock);
+ }
+ iolog_close_all(closure);
+ sudo_ev_free(closure->commit_ev);
+ sudo_ev_free(closure->read_ev);
+ sudo_ev_free(closure->write_ev);
+#if defined(HAVE_OPENSSL)
+ sudo_ev_free(closure->ssl_accept_ev);
+#endif
+ eventlog_free(closure->evlog);
+ free(closure->read_buf.data);
+ while ((buf = TAILQ_FIRST(&closure->write_bufs)) != NULL) {
+ sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+ "discarding write buffer %p, len %u", buf, buf->len - buf->off);
+ TAILQ_REMOVE(&closure->write_bufs, buf, entries);
+ free(buf->data);
+ free(buf);
+ }
+ while ((buf = TAILQ_FIRST(&closure->free_bufs)) != NULL) {
+ TAILQ_REMOVE(&closure->free_bufs, buf, entries);
+ free(buf->data);
+ free(buf);
+ }
+ free(closure->journal_path);
+ if (closure->journal != NULL)
+ fclose(closure->journal);
+ free(closure);
+
+ if (shutting_down && TAILQ_EMPTY(&connections))
+ sudo_ev_loopbreak(evbase);
+ }
+
+ debug_return;
+}
+
+/*
+ * Allocate a new connection closure.
+ */
+struct connection_closure *
+connection_closure_alloc(int fd, bool tls, bool relay_only,
+ struct sudo_event_base *base)
+{
+ struct connection_closure *closure;
+ debug_decl(connection_closure_alloc, SUDO_DEBUG_UTIL);
+
+ if ((closure = calloc(1, sizeof(*closure))) == NULL)
+ debug_return_ptr(NULL);
+
+ closure->iolog_dir_fd = -1;
+ closure->sock = relay_only ? -1 : fd;
+ closure->evbase = base;
+ TAILQ_INIT(&closure->write_bufs);
+ TAILQ_INIT(&closure->free_bufs);
+
+ /* Use different message handlers depending on the operating mode. */
+ if (relay_only) {
+ closure->cms = &cms_relay;
+ } else if (logsrvd_conf_relay_store_first()) {
+ closure->store_first = true;
+ closure->cms = &cms_journal;
+ } else {
+ closure->cms = &cms_local;
+ }
+
+ TAILQ_INSERT_TAIL(&connections, closure, entries);
+
+ closure->read_buf.size = 64 * 1024;
+ closure->read_buf.data = malloc(closure->read_buf.size);
+ if (closure->read_buf.data == NULL)
+ goto bad;
+
+ closure->read_ev = sudo_ev_alloc(fd, SUDO_EV_READ|SUDO_EV_PERSIST,
+ client_msg_cb, closure);
+ if (closure->read_ev == NULL)
+ goto bad;
+
+ if (!relay_only) {
+ closure->write_ev = sudo_ev_alloc(fd, SUDO_EV_WRITE|SUDO_EV_PERSIST,
+ server_msg_cb, closure);
+ if (closure->write_ev == NULL)
+ goto bad;
+
+ closure->commit_ev = sudo_ev_alloc(-1, SUDO_EV_TIMEOUT,
+ server_commit_cb, closure);
+ if (closure->commit_ev == NULL)
+ goto bad;
+ }
+#if defined(HAVE_OPENSSL)
+ if (tls) {
+ closure->ssl_accept_ev = sudo_ev_alloc(fd, SUDO_EV_READ,
+ tls_handshake_cb, closure);
+ if (closure->ssl_accept_ev == NULL)
+ goto bad;
+ }
+#endif
+
+ debug_return_ptr(closure);
+bad:
+ connection_closure_free(closure);
+ debug_return_ptr(NULL);
+}
+
+/*
+ * Close the client connection when finished.
+ * If in store-and-forward mode, initiate a relay connection.
+ * Otherwise, free the connection closure, removing any events.
+ */
+void
+connection_close(struct connection_closure *closure)
+{
+ struct connection_closure *new_closure;
+ debug_decl(connection_close, SUDO_DEBUG_UTIL);
+
+ if (closure == NULL)
+ debug_return;
+
+ /* Final state should be FINISHED except on error. */
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "%s: closure %p, final state %d, relay_closure %p, "
+ "journal file %p, journal path %s", __func__, closure,
+ closure->state, closure->relay_closure, closure->journal,
+ closure->journal_path ? closure->journal_path : "");
+
+ /*
+ * If we finished a client connection in store-and-forward mode,
+ * create a new connection for the relay and replay the journal.
+ */
+ if (closure->store_first && closure->state == FINISHED &&
+ closure->relay_closure == NULL && closure->journal != NULL) {
+ new_closure = connection_closure_alloc(fileno(closure->journal), false,
+ true, closure->evbase);
+ if (new_closure != NULL) {
+ /* Re-parent journal settings. */
+ new_closure->journal = closure->journal;
+ closure->journal = NULL;
+ new_closure->journal_path = closure->journal_path;
+ closure->journal_path = NULL;
+
+ /* Connect to the first relay available asynchronously. */
+ if (!connect_relay(new_closure)) {
+ sudo_warnx("%s", U_("unable to connect to relay"));
+ connection_closure_free(new_closure);
+ }
+ }
+ }
+ if (closure->state == FINISHED && closure->journal_path != NULL) {
+ /* Journal relayed successfully, remove backing file. */
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "removing journal file %s", closure->journal_path);
+ unlink(closure->journal_path);
+
+ /* Process the next outgoing file (if any). */
+ logsrvd_queue_enable(0, closure->evbase);
+ }
+ connection_closure_free(closure);
+
+ debug_return;
+}
+
+struct connection_buffer *
+get_free_buf(size_t len, struct connection_closure *closure)
+{
+ struct connection_buffer *buf;
+ debug_decl(get_free_buf, SUDO_DEBUG_UTIL);
+
+ buf = TAILQ_FIRST(&closure->free_bufs);
+ if (buf != NULL) {
+ TAILQ_REMOVE(&closure->free_bufs, buf, entries);
+ } else {
+ if ((buf = calloc(1, sizeof(*buf))) == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ debug_return_ptr(NULL);
+ }
+ }
+
+ if (len > buf->size) {
+ free(buf->data);
+ buf->size = sudo_pow2_roundup(len);
+ if ((buf->data = malloc(buf->size)) == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ free(buf);
+ buf = NULL;
+ }
+ }
+
+ debug_return_ptr(buf);
+}
+
+static bool
+fmt_server_message(struct connection_closure *closure, ServerMessage *msg)
+{
+ struct connection_buffer *buf = NULL;
+ uint32_t msg_len;
+ bool ret = false;
+ size_t len;
+ debug_decl(fmt_server_message, SUDO_DEBUG_UTIL);
+
+ len = server_message__get_packed_size(msg);
+ if (len > MESSAGE_SIZE_MAX) {
+ sudo_warnx(U_("server message too large: %zu"), len);
+ goto done;
+ }
+
+ /* Wire message size is used for length encoding, precedes message. */
+ msg_len = htonl((uint32_t)len);
+ len += sizeof(msg_len);
+
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "size + server message %zu bytes", len);
+
+ if ((buf = get_free_buf(len, closure)) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate connection_buffer");
+ goto done;
+ }
+ memcpy(buf->data, &msg_len, sizeof(msg_len));
+ server_message__pack(msg, buf->data + sizeof(msg_len));
+ buf->len = len;
+ TAILQ_INSERT_TAIL(&closure->write_bufs, buf, entries);
+
+ ret = true;
+
+done:
+ debug_return_bool(ret);
+}
+
+static bool
+fmt_hello_message(struct connection_closure *closure)
+{
+ ServerMessage msg = SERVER_MESSAGE__INIT;
+ ServerHello hello = SERVER_HELLO__INIT;
+ debug_decl(fmt_hello_message, SUDO_DEBUG_UTIL);
+
+ /* TODO: implement redirect and servers array. */
+ hello.server_id = (char *)server_id;
+ hello.subcommands = true;
+ msg.u.hello = &hello;
+ msg.type_case = SERVER_MESSAGE__TYPE_HELLO;
+
+ debug_return_bool(fmt_server_message(closure, &msg));
+}
+
+bool
+fmt_log_id_message(const char *id, struct connection_closure *closure)
+{
+ ServerMessage msg = SERVER_MESSAGE__INIT;
+ debug_decl(fmt_log_id_message, SUDO_DEBUG_UTIL);
+
+ msg.u.log_id = (char *)id;
+ msg.type_case = SERVER_MESSAGE__TYPE_LOG_ID;
+
+ debug_return_bool(fmt_server_message(closure, &msg));
+}
+
+static bool
+fmt_error_message(const char *errstr, struct connection_closure *closure)
+{
+ ServerMessage msg = SERVER_MESSAGE__INIT;
+ debug_decl(fmt_error_message, SUDO_DEBUG_UTIL);
+
+ msg.u.error = (char *)errstr;
+ msg.type_case = SERVER_MESSAGE__TYPE_ERROR;
+
+ debug_return_bool(fmt_server_message(closure, &msg));
+}
+
+/*
+ * Format a ServerMessage with the error string and add it to the write queue.
+ * Also sets the error flag state to true.
+ * Returns true if successfully scheduled, else false.
+ */
+bool
+schedule_error_message(const char *errstr, struct connection_closure *closure)
+{
+ bool ret = false;
+ debug_decl(schedule_error_message, SUDO_DEBUG_UTIL);
+
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "send error to client: %s", errstr ? errstr : "none");
+
+ /* Prevent further reads from the client, just write the error. */
+ sudo_ev_del(closure->evbase, closure->read_ev);
+
+ if (errstr == NULL || closure->error || closure->write_ev == NULL)
+ goto done;
+
+ /* Format error message and add to the write queue. */
+ if (!fmt_error_message(errstr, closure))
+ goto done;
+ if (sudo_ev_add(closure->evbase, closure->write_ev,
+ logsrvd_conf_server_timeout(), true) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ goto done;
+ }
+ ret = true;
+
+done:
+ closure->error = true;
+ debug_return_bool(ret);
+}
+
+/*
+ * AcceptMessage handler.
+ */
+static bool
+handle_accept(AcceptMessage *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ bool ret;
+ debug_decl(handle_accept, SUDO_DEBUG_UTIL);
+
+ /* We can get an AcceptMessage for a sub-command during a session. */
+ if (closure->state == EXITED || closure->state == FINISHED) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->submit_time == NULL || msg->n_info_msgs == 0) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid AcceptMessage"));
+ closure->errstr = _("invalid AcceptMessage");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received AcceptMessage from %s",
+ __func__, source);
+
+ ret = closure->cms->accept(msg, buf, len, closure);
+ if (ret && closure->state == INITIAL) {
+ if (msg->expect_iobufs)
+ closure->log_io = true;
+ closure->state = RUNNING;
+ }
+ debug_return_bool(ret);
+}
+
+/*
+ * RejectMessage handler.
+ */
+static bool
+handle_reject(RejectMessage *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ bool ret;
+ debug_decl(handle_reject, SUDO_DEBUG_UTIL);
+
+ /* We can get a RejectMessage for a sub-command during a session. */
+ if (closure->state == EXITED || closure->state == FINISHED) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->submit_time == NULL || msg->n_info_msgs == 0) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid RejectMessage"));
+ closure->errstr = _("invalid RejectMessage");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received RejectMessage from %s",
+ __func__, source);
+
+ ret = closure->cms->reject(msg, buf, len, closure);
+ if (ret && closure->state == INITIAL) {
+ closure->state = FINISHED;
+ }
+
+ debug_return_bool(ret);
+}
+
+static bool
+handle_exit(ExitMessage *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ bool ret;
+ debug_decl(handle_exit, SUDO_DEBUG_UTIL);
+
+ if (closure->state != RUNNING) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->run_time == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid ExitMessage"));
+ closure->errstr = _("invalid ExitMessage");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received ExitMessage from %s",
+ source, __func__);
+
+ ret = closure->cms->exit(msg, buf, len, closure);
+ if (ret) {
+ if (sudo_timespecisset(&closure->elapsed_time)) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: elapsed time: [%lld, %ld]",
+ __func__, (long long)closure->elapsed_time.tv_sec,
+ closure->elapsed_time.tv_nsec);
+ }
+
+ if (closure->log_io) {
+ /* Command exited, client waiting for final commit point. */
+ closure->state = EXITED;
+
+ /* Relay host will send the final commit point. */
+ if (closure->relay_closure == NULL) {
+ struct timespec tv = { 0, 0 };
+ if (sudo_ev_add(closure->evbase, closure->commit_ev, &tv, false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ ret = false;
+ }
+ }
+ } else {
+ /* No commit point to send to client, we are finished. */
+ closure->state = FINISHED;
+ }
+ }
+ sudo_ev_del(closure->evbase, closure->read_ev);
+
+ debug_return_bool(ret);
+}
+
+static bool
+handle_restart(RestartMessage *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ bool ret = true;
+ debug_decl(handle_restart, SUDO_DEBUG_UTIL);
+
+ if (closure->state != INITIAL) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->log_id == NULL || msg->resume_point == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid RestartMessage"));
+ closure->errstr = _("invalid RestartMessage");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: received RestartMessage for %s from %s", __func__, msg->log_id,
+ source);
+
+ /* Only I/O logs are restartable. */
+ closure->log_io = true;
+
+ if (closure->cms->restart(msg, buf, len, closure)) {
+ /* Successfully restarted. */
+ closure->state = RUNNING;
+ } else {
+ /* Report error to client before closing the connection. */
+ sudo_debug_printf(SUDO_DEBUG_WARN, "%s: unable to restart I/O log",
+ __func__);
+ if (!schedule_error_message(closure->errstr, closure))
+ ret = false;
+ }
+
+ debug_return_bool(ret);
+}
+
+static bool
+handle_alert(AlertMessage *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ debug_decl(handle_alert, SUDO_DEBUG_UTIL);
+
+ /* Check that message is valid. */
+ if (msg->alert_time == NULL || msg->reason == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid AlertMessage"));
+ closure->errstr = _("invalid AlertMessage");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received AlertMessage from %s",
+ source, __func__);
+
+ debug_return_bool(closure->cms->alert(msg, buf, len, closure));
+}
+
+/* Enable a commit event if not relaying and it is not already pending. */
+static bool
+enable_commit(struct connection_closure *closure)
+{
+ debug_decl(enable_commit, SUDO_DEBUG_UTIL);
+
+ if (closure->relay_closure == NULL) {
+ if (!ISSET(closure->commit_ev->flags, SUDO_EVQ_INSERTED)) {
+ struct timespec tv = { ACK_FREQUENCY, 0 };
+ if (sudo_ev_add(closure->evbase, closure->commit_ev, &tv, false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ debug_return_bool(false);
+ }
+ }
+ }
+ debug_return_bool(true);
+}
+
+static bool
+handle_iobuf(int iofd, IoBuffer *iobuf, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ debug_decl(handle_iobuf, SUDO_DEBUG_UTIL);
+
+ if (closure->state != RUNNING) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+ if (!closure->log_io) {
+ sudo_warnx(U_("%s: unexpected IoBuffer"), source);
+ closure->errstr = _("protocol error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (iobuf->delay == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid IoBuffer"));
+ closure->errstr = _("invalid IoBuffer");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received IoBuffer from %s",
+ source, __func__);
+
+ if (!closure->cms->iobuf(iofd, iobuf, buf, len, closure))
+ debug_return_bool(false);
+ if (!enable_commit(closure))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+static bool
+handle_winsize(ChangeWindowSize *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ debug_decl(handle_winsize, SUDO_DEBUG_UTIL);
+
+ if (closure->state != RUNNING) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+ if (!closure->log_io) {
+ sudo_warnx(U_("%s: unexpected IoBuffer"), source);
+ closure->errstr = _("protocol error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->delay == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid ChangeWindowSize"));
+ closure->errstr = _("invalid ChangeWindowSize");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received ChangeWindowSize from %s",
+ source, __func__);
+
+ if (!closure->cms->winsize(msg, buf, len, closure))
+ debug_return_bool(false);
+ if (!enable_commit(closure))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+static bool
+handle_suspend(CommandSuspend *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ debug_decl(handle_syspend, SUDO_DEBUG_UTIL);
+
+ if (closure->state != RUNNING) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+ if (!closure->log_io) {
+ sudo_warnx(U_("%s: unexpected IoBuffer"), source);
+ closure->errstr = _("protocol error");
+ debug_return_bool(false);
+ }
+
+ /* Check that message is valid. */
+ if (msg->delay == NULL || msg->signal == NULL) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid CommandSuspend"));
+ closure->errstr = _("invalid CommandSuspend");
+ debug_return_bool(false);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received CommandSuspend from %s",
+ source, __func__);
+
+ if (!closure->cms->suspend(msg, buf, len, closure))
+ debug_return_bool(false);
+ if (!enable_commit(closure))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+static bool
+handle_client_hello(ClientHello *msg, uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ debug_decl(handle_client_hello, SUDO_DEBUG_UTIL);
+
+ if (closure->state != INITIAL) {
+ sudo_warnx(U_("unexpected state %d for %s"), closure->state, source);
+ closure->errstr = _("state machine error");
+ debug_return_bool(false);
+ }
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received ClientHello",
+ __func__);
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: client ID %s",
+ __func__, msg->client_id ? msg->client_id : "unknown");
+
+ debug_return_bool(true);
+}
+
+static bool
+handle_client_message(uint8_t *buf, size_t len,
+ struct connection_closure *closure)
+{
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ ClientMessage *msg;
+ bool ret = false;
+ debug_decl(handle_client_message, SUDO_DEBUG_UTIL);
+
+ /* TODO: can we extract type_case without unpacking for relay case? */
+ msg = client_message__unpack(NULL, len, buf);
+ if (msg == NULL) {
+ sudo_warnx(U_("unable to unpack %s size %zu"), "ClientMessage", len);
+ debug_return_bool(false);
+ }
+
+ switch (msg->type_case) {
+ case CLIENT_MESSAGE__TYPE_ACCEPT_MSG:
+ ret = handle_accept(msg->u.accept_msg, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_REJECT_MSG:
+ ret = handle_reject(msg->u.reject_msg, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_EXIT_MSG:
+ ret = handle_exit(msg->u.exit_msg, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_RESTART_MSG:
+ ret = handle_restart(msg->u.restart_msg, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_ALERT_MSG:
+ ret = handle_alert(msg->u.alert_msg, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_TTYIN_BUF:
+ ret = handle_iobuf(IOFD_TTYIN, msg->u.ttyin_buf, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_TTYOUT_BUF:
+ ret = handle_iobuf(IOFD_TTYOUT, msg->u.ttyout_buf, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_STDIN_BUF:
+ ret = handle_iobuf(IOFD_STDIN, msg->u.stdin_buf, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_STDOUT_BUF:
+ ret = handle_iobuf(IOFD_STDOUT, msg->u.stdout_buf, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_STDERR_BUF:
+ ret = handle_iobuf(IOFD_STDERR, msg->u.stderr_buf, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_WINSIZE_EVENT:
+ ret = handle_winsize(msg->u.winsize_event, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_SUSPEND_EVENT:
+ ret = handle_suspend(msg->u.suspend_event, buf, len, closure);
+ break;
+ case CLIENT_MESSAGE__TYPE_HELLO_MSG:
+ ret = handle_client_hello(msg->u.hello_msg, buf, len, closure);
+ break;
+ default:
+ sudo_warnx(U_("unexpected type_case value %d in %s from %s"),
+ msg->type_case, "ClientMessage", source);
+ closure->errstr = _("unrecognized ClientMessage type");
+ break;
+ }
+ client_message__free_unpacked(msg, NULL);
+
+ debug_return_bool(ret);
+}
+
+static void
+shutdown_cb(int unused, int what, void *v)
+{
+ struct sudo_event_base *base = v;
+ debug_decl(shutdown_cb, SUDO_DEBUG_UTIL);
+
+ sudo_ev_loopbreak(base);
+
+ debug_return;
+}
+
+/*
+ * Shut down active client connections if any, or exit immediately.
+ */
+static void
+server_shutdown(struct sudo_event_base *base)
+{
+ struct connection_closure *closure, *next;
+ struct sudo_event *ev;
+ struct timespec tv = { 0, 0 };
+ debug_decl(server_shutdown, SUDO_DEBUG_UTIL);
+
+ if (TAILQ_EMPTY(&connections)) {
+ sudo_ev_loopbreak(base);
+ debug_return;
+ }
+
+ TAILQ_FOREACH_SAFE(closure, &connections, entries, next) {
+ closure->state = SHUTDOWN;
+ sudo_ev_del(base, closure->read_ev);
+ if (closure->relay_closure != NULL) {
+ /* Connection being relayed, check for pending I/O. */
+ relay_shutdown(closure);
+ } else if (closure->log_io) {
+ /* Schedule final commit point for the connection. */
+ if (sudo_ev_add(base, closure->commit_ev, &tv, false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ }
+ } else {
+ /* No commit point, close connection immediately. */
+ connection_close(closure);
+ }
+ }
+
+ if (!TAILQ_EMPTY(&connections)) {
+ /* We need a timed event to exit even if clients time out. */
+ ev = sudo_ev_alloc(-1, SUDO_EV_TIMEOUT, shutdown_cb, base);
+ if (ev != NULL) {
+ tv.tv_sec = SHUTDOWN_TIMEO;
+ if (sudo_ev_add(base, ev, &tv, false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ }
+ }
+ }
+
+ debug_return;
+}
+
+/*
+ * Send a server message to the client.
+ */
+static void
+server_msg_cb(int fd, int what, void *v)
+{
+ struct connection_closure *closure = v;
+ struct connection_buffer *buf;
+ ssize_t nwritten;
+ debug_decl(server_msg_cb, SUDO_DEBUG_UTIL);
+
+ /* For TLS we may need to write as part of SSL_read(). */
+ if (closure->read_instead_of_write) {
+ closure->read_instead_of_write = false;
+ /* Delete write event if it was only due to SSL_read(). */
+ if (closure->temporary_write_event) {
+ closure->temporary_write_event = false;
+ sudo_ev_del(closure->evbase, closure->write_ev);
+ }
+ client_msg_cb(fd, what, v);
+ debug_return;
+ }
+
+ if (what == SUDO_EV_TIMEOUT) {
+ sudo_warnx(U_("timed out writing to client %s"), closure->ipaddr);
+ goto finished;
+ }
+
+ if ((buf = TAILQ_FIRST(&closure->write_bufs)) == NULL) {
+ sudo_warnx(U_("missing write buffer for client %s"), closure->ipaddr);
+ goto finished;
+ }
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending %u bytes to client (%s)",
+ __func__, buf->len - buf->off, closure->ipaddr);
+
+#if defined(HAVE_OPENSSL)
+ if (closure->ssl != NULL) {
+ nwritten = SSL_write(closure->ssl, buf->data + buf->off,
+ buf->len - buf->off);
+ if (nwritten <= 0) {
+ const char *errstr;
+ int err = SSL_get_error(closure->ssl, nwritten);
+ switch (err) {
+ case SSL_ERROR_WANT_READ:
+ /* ssl wants to read, read event always active */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_write returns SSL_ERROR_WANT_READ");
+ /* Redirect persistent read event to finish SSL_write() */
+ closure->write_instead_of_read = true;
+ debug_return;
+ case SSL_ERROR_WANT_WRITE:
+ /* ssl wants to write more, write event remains active */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_write returns SSL_ERROR_WANT_WRITE");
+ debug_return;
+ case SSL_ERROR_SYSCALL:
+ sudo_warn("%s: SSL_write", closure->ipaddr);
+ goto finished;
+ default:
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx("%s: SSL_write: %s", closure->ipaddr,
+ errstr ? errstr : strerror(errno));
+ goto finished;
+ }
+ }
+ } else
+#endif
+ {
+ nwritten = write(fd, buf->data + buf->off, buf->len - buf->off);
+ }
+
+ if (nwritten == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ debug_return;
+ sudo_warn("%s: write", closure->ipaddr);
+ goto finished;
+ }
+ buf->off += nwritten;
+
+ if (buf->off == buf->len) {
+ /* sent entire message, move buf to free list */
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: finished sending %u bytes to client", __func__, buf->len);
+ buf->off = 0;
+ buf->len = 0;
+ TAILQ_REMOVE(&closure->write_bufs, buf, entries);
+ TAILQ_INSERT_TAIL(&closure->free_bufs, buf, entries);
+ if (TAILQ_EMPTY(&closure->write_bufs)) {
+ /* Write queue empty, check state. */
+ sudo_ev_del(closure->evbase, closure->write_ev);
+ if (closure->error || closure->state == FINISHED ||
+ closure->state == SHUTDOWN)
+ goto finished;
+ }
+ }
+ debug_return;
+
+finished:
+ connection_close(closure);
+ debug_return;
+}
+
+/*
+ * Receive client message(s).
+ */
+static void
+client_msg_cb(int fd, int what, void *v)
+{
+ struct connection_closure *closure = v;
+ struct connection_buffer *buf = &closure->read_buf;
+ const char *source = closure->journal_path ? closure->journal_path :
+ closure->ipaddr;
+ uint32_t msg_len;
+ ssize_t nread;
+ debug_decl(client_msg_cb, SUDO_DEBUG_UTIL);
+
+ /* For TLS we may need to read as part of SSL_write(). */
+ if (closure->write_instead_of_read) {
+ closure->write_instead_of_read = false;
+ server_msg_cb(fd, what, v);
+ debug_return;
+ }
+
+ if (what == SUDO_EV_TIMEOUT) {
+ sudo_warnx(U_("timed out reading from client %s"), closure->ipaddr);
+ goto close_connection;
+ }
+
+#if defined(HAVE_OPENSSL)
+ if (closure->ssl != NULL) {
+ nread = SSL_read(closure->ssl, buf->data + buf->len, buf->size);
+ if (nread <= 0) {
+ const char *errstr;
+ int err = SSL_get_error(closure->ssl, nread);
+ switch (err) {
+ case SSL_ERROR_ZERO_RETURN:
+ /* ssl connection shutdown cleanly */
+ nread = 0;
+ break;
+ case SSL_ERROR_WANT_READ:
+ /* ssl wants to read more, read event is always active */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_read returns SSL_ERROR_WANT_READ");
+ /* Read event is always active. */
+ debug_return;
+ case SSL_ERROR_WANT_WRITE:
+ /* ssl wants to write, schedule a write if not pending */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_read returns SSL_ERROR_WANT_WRITE");
+ if (!sudo_ev_pending(closure->write_ev, SUDO_EV_WRITE, NULL)) {
+ /* Enable a temporary write event. */
+ if (sudo_ev_add(closure->evbase, closure->write_ev,
+ logsrvd_conf_server_timeout(), false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ closure->errstr = _("unable to allocate memory");
+ goto send_error;
+ }
+ closure->temporary_write_event = true;
+ }
+ /* Redirect write event to finish SSL_read() */
+ closure->read_instead_of_write = true;
+ debug_return;
+ case SSL_ERROR_SYSCALL:
+ if (nread == 0) {
+ /* EOF, handled below */
+ sudo_warnx(U_("EOF from %s without proper TLS shutdown"),
+ closure->ipaddr);
+ break;
+ }
+ sudo_warn("%s: SSL_read", closure->ipaddr);
+ goto close_connection;
+ default:
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx("%s: SSL_read: %s", closure->ipaddr,
+ errstr ? errstr : strerror(errno));
+ goto close_connection;
+ }
+ }
+ } else
+#endif
+ {
+ nread = read(fd, buf->data + buf->len, buf->size - buf->len);
+ }
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received %zd bytes from client %s",
+ __func__, nread, closure->ipaddr);
+ switch (nread) {
+ case -1:
+ if (errno == EAGAIN || errno == EINTR)
+ debug_return;
+ sudo_warn("%s: read", closure->ipaddr);
+ goto close_connection;
+ case 0:
+ if (closure->state != FINISHED) {
+ sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+ "unexpected EOF");
+ }
+ goto close_connection;
+ default:
+ break;
+ }
+ buf->len += nread;
+
+ while (buf->len - buf->off >= sizeof(msg_len)) {
+ /* Read wire message size (uint32_t in network byte order). */
+ memcpy(&msg_len, buf->data + buf->off, sizeof(msg_len));
+ msg_len = ntohl(msg_len);
+
+ if (msg_len > MESSAGE_SIZE_MAX) {
+ sudo_warnx(U_("client message too large: %zu"), (size_t)msg_len);
+ closure->errstr = _("client message too large");
+ goto send_error;
+ }
+
+ if (msg_len + sizeof(msg_len) > buf->len - buf->off) {
+ /* Incomplete message, we'll read the rest next time. */
+ if (!expand_buf(buf, msg_len + sizeof(msg_len))) {
+ closure->errstr = _("unable to allocate memory");
+ goto send_error;
+ }
+ debug_return;
+ }
+
+ /* Parse ClientMessage (could be zero bytes). */
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: parsing ClientMessage, size %u", __func__, msg_len);
+ buf->off += sizeof(msg_len);
+ if (!handle_client_message(buf->data + buf->off, msg_len, closure)) {
+ sudo_warnx(U_("%s: %s"), source, U_("invalid ClientMessage"));
+ closure->errstr = _("invalid ClientMessage");
+ goto send_error;
+ }
+ buf->off += msg_len;
+ }
+ buf->len -= buf->off;
+ buf->off = 0;
+
+ if (closure->state == FINISHED)
+ goto close_connection;
+
+ debug_return;
+
+send_error:
+ /*
+ * Try to send client an error message before closing the connection.
+ */
+ if (!schedule_error_message(closure->errstr, closure))
+ goto close_connection;
+ debug_return;
+
+close_connection:
+ connection_close(closure);
+ debug_return;
+}
+
+/*
+ * Format and schedule a commit_point message.
+ */
+bool
+schedule_commit_point(TimeSpec *commit_point,
+ struct connection_closure *closure)
+{
+ debug_decl(schedule_commit_point, SUDO_DEBUG_UTIL);
+
+ if (closure->write_ev != NULL) {
+ /* Send an acknowledgement of what we've committed to disk. */
+ ServerMessage msg = SERVER_MESSAGE__INIT;
+ msg.u.commit_point = commit_point;
+ msg.type_case = SERVER_MESSAGE__TYPE_COMMIT_POINT;
+
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: sending commit point [%lld, %ld]", __func__,
+ (long long)commit_point->tv_sec, (long)commit_point->tv_nsec);
+
+ if (!fmt_server_message(closure, &msg))
+ goto bad;
+ if (sudo_ev_add(closure->evbase, closure->write_ev,
+ logsrvd_conf_server_timeout(), false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ goto bad;
+ }
+ }
+
+ if (closure->state == EXITED)
+ closure->state = FINISHED;
+ debug_return_bool(true);
+bad:
+ debug_return_bool(false);
+}
+
+/*
+ * Time-based event that fires periodically to report to the client
+ * what has been committed to disk.
+ */
+static void
+server_commit_cb(int unused, int what, void *v)
+{
+ struct connection_closure *closure = v;
+ TimeSpec commit_point = TIME_SPEC__INIT;
+ debug_decl(server_commit_cb, SUDO_DEBUG_UTIL);
+
+ /* Flush I/O logs before sending commit point if needed. */
+ if (!iolog_get_flush())
+ iolog_flush_all(closure);
+
+ commit_point.tv_sec = closure->elapsed_time.tv_sec;
+ commit_point.tv_nsec = closure->elapsed_time.tv_nsec;
+ if (!schedule_commit_point(&commit_point, closure))
+ connection_close(closure);
+
+ debug_return;
+}
+
+/*
+ * Begin the sudo logserver protocol.
+ * When we enter the event loop the ServerHello message will be written
+ * and any pending ClientMessage will be read.
+ */
+bool
+start_protocol(struct connection_closure *closure)
+{
+ const struct timespec *timeout = logsrvd_conf_server_timeout();
+ debug_decl(start_protocol, SUDO_DEBUG_UTIL);
+
+ if (closure->relay_closure != NULL && closure->relay_closure->relays != NULL) {
+ /* No longer need the stashed relays list. */
+ address_list_delref(closure->relay_closure->relays);
+ closure->relay_closure->relays = NULL;
+ closure->relay_closure->relay_addr = NULL;
+ }
+
+ /* When replaying a journal there is no write event. */
+ if (closure->write_ev != NULL) {
+ if (!fmt_hello_message(closure))
+ debug_return_bool(false);
+
+ if (sudo_ev_add(closure->evbase, closure->write_ev, timeout, false) == -1)
+ debug_return_bool(false);
+ }
+
+ /* No read timeout, client messages may happen at arbitrary times. */
+ if (sudo_ev_add(closure->evbase, closure->read_ev, NULL, false) == -1)
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+#if defined(HAVE_OPENSSL)
+static int
+verify_peer_identity(int preverify_ok, X509_STORE_CTX *ctx)
+{
+ HostnameValidationResult result;
+ struct connection_closure *closure;
+ SSL *ssl;
+ X509 *current_cert;
+ X509 *peer_cert;
+ debug_decl(verify_peer_identity, SUDO_DEBUG_UTIL);
+
+ /* if pre-verification of the cert failed, just propagate that result back */
+ if (preverify_ok != 1) {
+ debug_return_int(0);
+ }
+
+ /* since this callback is called for each cert in the chain,
+ * check that current cert is the peer's certificate
+ */
+ current_cert = X509_STORE_CTX_get_current_cert(ctx);
+ peer_cert = X509_STORE_CTX_get0_cert(ctx);
+
+ if (current_cert != peer_cert) {
+ debug_return_int(1);
+ }
+
+ /* read out the attached object (closure) from the ssl connection object */
+ ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
+ closure = (struct connection_closure *)SSL_get_ex_data(ssl, 1);
+
+ result = validate_hostname(peer_cert, closure->ipaddr, closure->ipaddr, 1);
+
+ switch(result)
+ {
+ case MatchFound:
+ debug_return_int(1);
+ default:
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "hostname validation failed");
+ debug_return_int(0);
+ }
+}
+
+/*
+ * Set the TLS verify callback to verify_peer_identity().
+ */
+static void
+set_tls_verify_peer(void)
+{
+ SSL_CTX *server_ctx = logsrvd_server_tls_ctx();
+ SSL_CTX *relay_ctx = logsrvd_relay_tls_ctx();
+ debug_decl(set_tls_verify_peer, SUDO_DEBUG_UTIL);
+
+ if (server_ctx != NULL && logsrvd_conf_server_tls_check_peer()) {
+ /* Verify server cert during the handshake. */
+ SSL_CTX_set_verify(server_ctx,
+ SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+ verify_peer_identity);
+ }
+ if (relay_ctx != NULL && logsrvd_conf_relay_tls_check_peer()) {
+ /* Verify relay cert during the handshake. */
+ SSL_CTX_set_verify(relay_ctx,
+ SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+ verify_peer_identity);
+ }
+
+ debug_return;
+}
+
+static void
+tls_handshake_cb(int fd, int what, void *v)
+{
+ struct connection_closure *closure = v;
+ const char *errstr;
+ int err, handshake_status;
+ debug_decl(tls_handshake_cb, SUDO_DEBUG_UTIL);
+
+ if (what == SUDO_EV_TIMEOUT) {
+ sudo_warnx("TLS handshake with %s timed out", closure->ipaddr);
+ goto bad;
+ }
+
+ handshake_status = SSL_accept(closure->ssl);
+ err = SSL_get_error(closure->ssl, handshake_status);
+ switch (err) {
+ case SSL_ERROR_NONE:
+ /* ssl handshake was successful */
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "TLS handshake successful");
+ break;
+ case SSL_ERROR_WANT_READ:
+ /* ssl handshake is ongoing, re-schedule the SSL_accept() call */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_accept returns SSL_ERROR_WANT_READ");
+ if (what != SUDO_EV_READ) {
+ if (sudo_ev_set(closure->ssl_accept_ev, closure->sock,
+ SUDO_EV_READ, tls_handshake_cb, closure) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to set ssl_accept_ev to SUDO_EV_READ");
+ goto bad;
+ }
+ }
+ if (sudo_ev_add(closure->evbase, closure->ssl_accept_ev,
+ logsrvd_conf_server_timeout(), false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ goto bad;
+ }
+ debug_return;
+ case SSL_ERROR_WANT_WRITE:
+ /* ssl handshake is ongoing, re-schedule the SSL_accept() call */
+ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO,
+ "SSL_accept returns SSL_ERROR_WANT_WRITE");
+ if (what != SUDO_EV_WRITE) {
+ if (sudo_ev_set(closure->ssl_accept_ev, closure->sock,
+ SUDO_EV_WRITE, tls_handshake_cb, closure) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to set ssl_accept_ev to SUDO_EV_WRITE");
+ goto bad;
+ }
+ }
+ if (sudo_ev_add(closure->evbase, closure->ssl_accept_ev,
+ logsrvd_conf_server_timeout(), false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ goto bad;
+ }
+ debug_return;
+ case SSL_ERROR_SYSCALL:
+ sudo_warn("%s: SSL_accept", closure->ipaddr);
+ goto bad;
+ default:
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx("%s: SSL_accept: %s", closure->ipaddr,
+ errstr ? errstr : strerror(errno));
+ goto bad;
+ }
+
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "TLS version: %s, negotiated cipher suite: %s",
+ SSL_get_version(closure->ssl),
+ SSL_get_cipher(closure->ssl));
+
+ /* Start the actual protocol now that the TLS handshake is complete. */
+ if (!TAILQ_EMPTY(logsrvd_conf_relay_address()) && !closure->store_first) {
+ if (!connect_relay(closure))
+ goto bad;
+ } else {
+ if (!start_protocol(closure))
+ goto bad;
+ }
+
+ debug_return;
+bad:
+ connection_close(closure);
+ debug_return;
+}
+#endif /* HAVE_OPENSSL */
+
+/*
+ * New connection.
+ * Allocate a connection closure and optionally perform TLS handshake.
+ */
+static bool
+new_connection(int sock, bool tls, const union sockaddr_union *sa_un,
+ struct sudo_event_base *evbase)
+{
+ struct connection_closure *closure;
+ debug_decl(new_connection, SUDO_DEBUG_UTIL);
+
+ if ((closure = connection_closure_alloc(sock, tls, false, evbase)) == NULL)
+ goto bad;
+
+ /* store the peer's IP address in the closure object */
+ if (sa_un->sa.sa_family == AF_INET) {
+ inet_ntop(AF_INET, &sa_un->sin.sin_addr, closure->ipaddr,
+ sizeof(closure->ipaddr));
+#ifdef HAVE_STRUCT_IN6_ADDR
+ } else if (sa_un->sa.sa_family == AF_INET6) {
+ inet_ntop(AF_INET6, &sa_un->sin6.sin6_addr, closure->ipaddr,
+ sizeof(closure->ipaddr));
+#endif /* HAVE_STRUCT_IN6_ADDR */
+ } else {
+ errno = EAFNOSUPPORT;
+ sudo_warn("%s", U_("unable to get remote IP addr"));
+ goto bad;
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "connection from %s", closure->ipaddr);
+
+#if defined(HAVE_OPENSSL)
+ /* If TLS is enabled, perform the TLS handshake first. */
+ if (tls) {
+ const char *errstr;
+
+ /* Create the SSL object for the closure and attach it to the socket */
+ if ((closure->ssl = SSL_new(logsrvd_server_tls_ctx())) == NULL) {
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx(U_("%s: %s"), "SSL_new",
+ errstr ? errstr : strerror(errno));
+ goto bad;
+ }
+
+ if (SSL_set_fd(closure->ssl, closure->sock) != 1) {
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx(U_("%s: %s"), "SSL_set_fd",
+ errstr ? errstr : strerror(errno));
+ goto bad;
+ }
+
+ /* attach the closure object to the ssl connection object to make it
+ available during hostname matching
+ */
+ if (SSL_set_ex_data(closure->ssl, 1, closure) <= 0) {
+ errstr = ERR_reason_error_string(ERR_get_error());
+ sudo_warnx(U_("Unable to attach user data to the ssl object: %s"),
+ errstr ? errstr : strerror(errno));
+ goto bad;
+ }
+
+ /* Enable SSL_accept to begin handshake with client. */
+ if (sudo_ev_add(evbase, closure->ssl_accept_ev,
+ logsrvd_conf_server_timeout(), false) == -1) {
+ sudo_warnx("%s", U_("unable to add event to queue"));
+ goto bad;
+ }
+ }
+#endif
+ /* If no TLS handshake, start the protocol immediately. */
+ if (!tls) {
+ if (!TAILQ_EMPTY(logsrvd_conf_relay_address()) && !closure->store_first) {
+ if (!connect_relay(closure))
+ goto bad;
+ } else {
+ if (!start_protocol(closure))
+ goto bad;
+ }
+ }
+
+ debug_return_bool(true);
+bad:
+ connection_close(closure);
+ debug_return_bool(false);
+}
+
+static int
+create_listener(struct server_address *addr)
+{
+ int flags, on, sock;
+ const char *family = "inet4";
+ debug_decl(create_listener, SUDO_DEBUG_UTIL);
+
+ if ((sock = socket(addr->sa_un.sa.sa_family, SOCK_STREAM, 0)) == -1) {
+ sudo_warn("socket");
+ goto bad;
+ }
+ on = 1;
+#ifdef HAVE_STRUCT_IN6_ADDR
+ if (addr->sa_un.sa.sa_family == AF_INET6) {
+ family = "inet6";
+# ifdef IPV6_V6ONLY
+ /* Disable IPv4-mapped IPv6 addresses. */
+ if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
+ sudo_warn("IPV6_V6ONLY");
+# endif
+ }
+#endif
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
+ sudo_warn("SO_REUSEADDR");
+ if (bind(sock, &addr->sa_un.sa, addr->sa_size) == -1) {
+ /* TODO: only warn once for IPv4 and IPv6 or disambiguate */
+ sudo_warn("%s (%s)", addr->sa_str, family);
+ goto bad;
+ }
+ if (listen(sock, SOMAXCONN) == -1) {
+ sudo_warn("listen");
+ goto bad;
+ }
+ flags = fcntl(sock, F_GETFL, 0);
+ if (flags == -1 || fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1) {
+ sudo_warn("fcntl(O_NONBLOCK)");
+ goto bad;
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "listening on %s (%s)", addr->sa_str,
+ family);
+
+ debug_return_int(sock);
+bad:
+ if (sock != -1)
+ close(sock);
+ debug_return_int(-1);
+}
+
+static void
+listener_cb(int fd, int what, void *v)
+{
+ struct listener *l = v;
+ struct sudo_event_base *evbase = sudo_ev_get_base(l->ev);
+ union sockaddr_union sa_un;
+ socklen_t salen = sizeof(sa_un);
+ int sock;
+ debug_decl(listener_cb, SUDO_DEBUG_UTIL);
+
+ memset(&sa_un, 0, sizeof(sa_un));
+ sock = accept(fd, &sa_un.sa, &salen);
+ if (sock != -1) {
+ if (logsrvd_conf_server_tcp_keepalive()) {
+ int keepalive = 1;
+ if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &keepalive,
+ sizeof(keepalive)) == -1) {
+ sudo_warn("SO_KEEPALIVE");
+ }
+ }
+ if (!new_connection(sock, l->tls, &sa_un, evbase)) {
+ /* TODO: pause accepting on ENOMEM */
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to start new connection");
+ }
+ } else {
+ if (errno == EAGAIN || errno == EINTR)
+ debug_return;
+ /* TODO: pause accepting on ENFILE and EMFILE */
+ sudo_warn("accept");
+ }
+
+ debug_return;
+}
+
+static bool
+register_listener(struct server_address *addr, struct sudo_event_base *evbase)
+{
+ struct listener *l;
+ int sock;
+ debug_decl(register_listener, SUDO_DEBUG_UTIL);
+
+ sock = create_listener(addr);
+ if (sock == -1)
+ debug_return_bool(false);
+
+ /* TODO: make non-fatal */
+ if ((l = malloc(sizeof(*l))) == NULL)
+ sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ l->sock = sock;
+ l->tls = addr->tls;
+ l->ev = sudo_ev_alloc(sock, SUDO_EV_READ|SUDO_EV_PERSIST, listener_cb, l);
+ if (l->ev == NULL)
+ sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ if (sudo_ev_add(evbase, l->ev, NULL, false) == -1)
+ sudo_fatal("%s", U_("unable to add event to queue"));
+ TAILQ_INSERT_TAIL(&listeners, l, entries);
+
+ debug_return_bool(true);
+}
+
+/*
+ * Register listeners and set the TLS verify callback.
+ */
+static bool
+server_setup(struct sudo_event_base *base)
+{
+ struct server_address *addr;
+ struct listener *l;
+ int nlisteners = 0;
+ bool ret;
+ debug_decl(server_setup, SUDO_DEBUG_UTIL);
+
+ /* Free old listeners (if any) and register new ones. */
+ while ((l = TAILQ_FIRST(&listeners)) != NULL) {
+ TAILQ_REMOVE(&listeners, l, entries);
+ sudo_ev_free(l->ev);
+ close(l->sock);
+ free(l);
+ }
+ TAILQ_FOREACH(addr, logsrvd_conf_server_listen_address(), entries) {
+ nlisteners += register_listener(addr, base);
+ }
+ ret = nlisteners > 0;
+
+#if defined(HAVE_OPENSSL)
+ if (ret)
+ set_tls_verify_peer();
+#endif
+
+ debug_return_bool(ret);
+}
+
+/*
+ * Reload config and re-initialize listeners.
+ */
+static void
+server_reload(struct sudo_event_base *evbase)
+{
+ debug_decl(server_reload, SUDO_DEBUG_UTIL);
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "reloading server config");
+ if (logsrvd_conf_read(conf_file)) {
+ /* Re-initialize listeners. */
+ if (!server_setup(evbase))
+ sudo_fatalx("%s", U_("unable to setup listen socket"));
+
+ /* Re-read sudo.conf and re-initialize debugging. */
+ sudo_debug_deregister(logsrvd_debug_instance);
+ logsrvd_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
+ if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) != -1) {
+ logsrvd_debug_instance = sudo_debug_register(getprogname(),
+ NULL, NULL, sudo_conf_debug_files(getprogname()), -1);
+ }
+ }
+
+ debug_return;
+}
+
+/*
+ * Dump server information to the debug file.
+ * Includes information about listeners and client connections.
+ */
+static void
+server_dump_stats(void)
+{
+ struct server_address *addr;
+ struct connection_closure *closure;
+ int n;
+ debug_decl(server_dump_stats, SUDO_DEBUG_UTIL);
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s", server_id);
+ sudo_debug_printf(SUDO_DEBUG_INFO, "configuration file: %s", conf_file);
+
+ sudo_debug_printf(SUDO_DEBUG_INFO, "listen addresses:");
+ n = 0;
+ TAILQ_FOREACH(addr, logsrvd_conf_server_listen_address(), entries) {
+ union sockaddr_union *sa_un = &addr->sa_un;
+ char ipaddr[INET6_ADDRSTRLEN];
+
+ switch (sa_un->sa.sa_family) {
+ case AF_INET:
+ inet_ntop(AF_INET, &sa_un->sin.sin_addr, ipaddr, sizeof(ipaddr));
+ break;
+#ifdef HAVE_STRUCT_IN6_ADDR
+ case AF_INET6:
+ inet_ntop(AF_INET6, &sa_un->sin6.sin6_addr, ipaddr, sizeof(ipaddr));
+ break;
+#endif /* HAVE_STRUCT_IN6_ADDR */
+ default:
+ (void)strlcpy(ipaddr, "[unknown]", sizeof(ipaddr));
+ break;
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, " %d: %s [%s]", ++n,
+ addr->sa_str, ipaddr);
+ }
+
+ if (!TAILQ_EMPTY(&connections)) {
+ n = 0;
+ sudo_debug_printf(SUDO_DEBUG_INFO, "client connections:");
+ TAILQ_FOREACH(closure, &connections, entries) {
+ struct relay_closure *relay_closure = closure->relay_closure;
+
+ n++;
+ if (closure->sock == -1) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, " %2d: journal %s", n,
+ closure->journal_path ? closure->journal_path : "none");
+ sudo_debug_printf(SUDO_DEBUG_INFO, " %2d: fd %d", n,
+ closure->journal ? fileno(closure->journal) : -1);
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_INFO, " %2d: addr %s%s", n,
+ closure->ipaddr, closure->tls ? " (TLS)" : "");
+ sudo_debug_printf(SUDO_DEBUG_INFO, " %2d: sock %d", n,
+ closure->sock);
+ }
+ if (relay_closure != NULL) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, " relay: %s (%s)",
+ relay_closure->relay_name.name,
+ relay_closure->relay_name.ipaddr);
+ sudo_debug_printf(SUDO_DEBUG_INFO, " relay sock: %d",
+ relay_closure->sock);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, " state: %d", closure->state);
+ if (closure->errstr != NULL) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, " error: %s",
+ closure->errstr);
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, " log I/O: %s",
+ closure->log_io ? "true" : "false");
+ sudo_debug_printf(SUDO_DEBUG_INFO, " store first: %s",
+ closure->store_first ? "true" : "false");
+ if (sudo_timespecisset(&closure->elapsed_time)) {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ " elapsed time: [%lld, %ld]",
+ (long long)closure->elapsed_time.tv_sec,
+ (long)closure->elapsed_time.tv_nsec);
+ }
+ }
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%d client connection(s)\n", n);
+ }
+ logsrvd_queue_dump();
+
+ debug_return;
+}
+
+static void
+signal_cb(int signo, int what, void *v)
+{
+ struct sudo_event_base *base = v;
+ debug_decl(signal_cb, SUDO_DEBUG_UTIL);
+
+ switch (signo) {
+ case SIGHUP:
+ server_reload(base);
+ break;
+ case SIGINT:
+ case SIGTERM:
+ /* Shut down active connections. */
+ server_shutdown(base);
+ break;
+ case SIGUSR1:
+ server_dump_stats();
+ break;
+ default:
+ sudo_warnx(U_("unexpected signal %d"), signo);
+ break;
+ }
+
+ debug_return;
+}
+
+static void
+register_signal(int signo, struct sudo_event_base *base)
+{
+ struct sudo_event *ev;
+ debug_decl(register_signal, SUDO_DEBUG_UTIL);
+
+ ev = sudo_ev_alloc(signo, SUDO_EV_SIGNAL, signal_cb, base);
+ if (ev == NULL)
+ sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ if (sudo_ev_add(base, ev, NULL, false) == -1)
+ sudo_fatal("%s", U_("unable to add event to queue"));
+
+ debug_return;
+}
+
+static void
+logsrvd_cleanup(void)
+{
+ /* TODO: cleanup like on signal */
+ return;
+}
+
+/*
+ * Write the process ID into a file, typically /var/run/sudo/sudo_logsrvd.pid.
+ * If the parent directory doesn't exist, it will be created.
+ */
+static void
+write_pidfile(void)
+{
+ FILE *fp;
+ int dfd, fd;
+ mode_t oldmask;
+ const char *pid_file = logsrvd_conf_pid_file();
+ debug_decl(write_pidfile, SUDO_DEBUG_UTIL);
+
+ if (pid_file == NULL)
+ debug_return;
+
+ /* Default logsrvd umask is more restrictive (077). */
+ oldmask = umask(S_IWGRP|S_IWOTH);
+
+ dfd = sudo_open_parent_dir(pid_file, ROOT_UID, ROOT_GID,
+ S_IRWXU|S_IXGRP|S_IXOTH, false);
+ if (dfd != -1) {
+ const char *base = sudo_basename(pid_file);
+ fd = openat(dfd, base, O_WRONLY|O_CREAT|O_NOFOLLOW, 0644);
+ if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) {
+ sudo_warn("%s", pid_file);
+ if (fd != -1)
+ close(fd);
+ } else {
+ fprintf(fp, "%u\n", (unsigned int)getpid());
+ fflush(fp);
+ if (ferror(fp))
+ sudo_warn("%s", pid_file);
+ fclose(fp);
+ }
+ close(dfd);
+ }
+ umask(oldmask);
+
+ debug_return;
+}
+
+/*
+ * Fork, detach from the terminal and write pid file unless nofork set.
+ */
+static void
+daemonize(bool nofork)
+{
+ int fd;
+ debug_decl(daemonize, SUDO_DEBUG_UTIL);
+
+ if (chdir("/") == -1)
+ sudo_warn("chdir(\"/\")");
+
+ if (!nofork) {
+ switch (sudo_debug_fork()) {
+ case -1:
+ sudo_fatal("fork");
+ case 0:
+ /* child */
+ break;
+ default:
+ /* parent, exit */
+ _exit(EXIT_SUCCESS);
+ }
+
+ /* detach from terminal and write pid file. */
+ if (setsid() == -1)
+ sudo_fatal("setsid");
+ write_pidfile();
+
+ if ((fd = open(_PATH_DEVNULL, O_RDWR)) != -1) {
+ (void) dup2(fd, STDIN_FILENO);
+ (void) dup2(fd, STDOUT_FILENO);
+ (void) dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ (void) close(fd);
+ }
+ } else {
+ if ((fd = open(_PATH_DEVNULL, O_RDWR)) != -1) {
+ /* Preserve stdout/stderr in nofork mode (if open). */
+ (void) dup2(fd, STDIN_FILENO);
+ if (fcntl(STDOUT_FILENO, F_GETFL) == -1)
+ (void) dup2(fd, STDOUT_FILENO);
+ if (fcntl(STDERR_FILENO, F_GETFL) == -1)
+ (void) dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ (void) close(fd);
+ }
+ }
+
+ /* Disable logging to stderr after we become a daemon. */
+ logsrvd_warn_stderr(false);
+
+ debug_return;
+}
+
+static void
+usage(bool fatal)
+{
+ fprintf(stderr, "usage: %s [-n] [-f conf_file] [-R percentage]\n",
+ getprogname());
+ if (fatal)
+ exit(EXIT_FAILURE);
+}
+
+static void
+help(void)
+{
+ printf("%s - %s\n\n", getprogname(), _("sudo log server"));
+ usage(false);
+ printf("\n%s\n", _("Options:"));
+ printf(" -f, --file %s\n",
+ _("path to configuration file"));
+ printf(" -h, --help %s\n",
+ _("display help message and exit"));
+ printf(" -n, --no-fork %s\n",
+ _("do not fork, run in the foreground"));
+ printf(" -R, --random-drop %s\n",
+ _("percent chance connections will drop"));
+ printf(" -V, --version %s\n",
+ _("display version information and exit"));
+ putchar('\n');
+ exit(EXIT_SUCCESS);
+}
+
+static const char short_opts[] = "f:hnR:V";
+static struct option long_opts[] = {
+ { "file", required_argument, NULL, 'f' },
+ { "help", no_argument, NULL, 'h' },
+ { "no-fork", no_argument, NULL, 'n' },
+ { "random-drop", required_argument, NULL, 'R' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, no_argument, NULL, 0 },
+};
+
+sudo_dso_public int main(int argc, char *argv[]);
+
+int
+main(int argc, char *argv[])
+{
+ struct sudo_event_base *evbase;
+ bool nofork = false;
+ int ch;
+ debug_decl_vars(main, SUDO_DEBUG_MAIN);
+
+#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
+ {
+ extern char *malloc_options;
+ malloc_options = "S";
+ }
+#endif
+
+ initprogname(argc > 0 ? argv[0] : "sudo_logsrvd");
+ setlocale(LC_ALL, "");
+ bindtextdomain("sudo", LOCALEDIR); /* XXX - add logsrvd domain */
+ textdomain("sudo");
+
+ /* Create files readable/writable only by owner. */
+ umask(S_IRWXG|S_IRWXO);
+
+ /* Register fatal/fatalx callback. */
+ sudo_fatal_callback_register(logsrvd_cleanup);
+
+ /* Read sudo.conf and initialize the debug subsystem. */
+ if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) == -1)
+ exit(EXIT_FAILURE);
+ logsrvd_debug_instance = sudo_debug_register(getprogname(), NULL, NULL,
+ sudo_conf_debug_files(getprogname()), -1);
+
+ if (protobuf_c_version_number() < 1003000)
+ sudo_fatalx("%s", U_("Protobuf-C version 1.3 or higher required"));
+
+ while ((ch = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
+ switch (ch) {
+ case 'f':
+ conf_file = optarg;
+ break;
+ case 'h':
+ help();
+ break;
+ case 'n':
+ nofork = true;
+ break;
+ case 'R':
+ /* random connection drop probability as a percentage (debug) */
+ if (!set_random_drop(optarg))
+ sudo_fatalx(U_("invalid random drop value: %s"), optarg);
+ break;
+ case 'V':
+ (void)printf(_("%s version %s\n"), getprogname(),
+ PACKAGE_VERSION);
+ return 0;
+ default:
+ usage(true);
+ }
+ }
+
+ /* Read sudo_logsrvd.conf */
+ if (!logsrvd_conf_read(conf_file))
+ exit(EXIT_FAILURE);
+
+ if ((evbase = sudo_ev_base_alloc()) == NULL)
+ sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+
+ /* Initialize listeners. */
+ if (!server_setup(evbase))
+ sudo_fatalx("%s", U_("unable to setup listen socket"));
+
+ register_signal(SIGHUP, evbase);
+ register_signal(SIGINT, evbase);
+ register_signal(SIGTERM, evbase);
+ register_signal(SIGUSR1, evbase);
+
+ /* Point of no return. */
+ daemonize(nofork);
+ signal(SIGPIPE, SIG_IGN);
+
+ logsrvd_queue_scan(evbase);
+ sudo_ev_dispatch(evbase);
+ if (!nofork && logsrvd_conf_pid_file() != NULL)
+ unlink(logsrvd_conf_pid_file());
+ logsrvd_conf_cleanup();
+
+ debug_return_int(1);
+}