mirror of https://github.com/sudo-project/sudo.git
288 lines
7.6 KiB
C
288 lines
7.6 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2021 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include <compat/stdbool.h>
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#endif /* HAVE_STDBOOL_H */
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#if defined(HAVE_STDINT_H)
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# include <stdint.h>
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#elif defined(HAVE_INTTYPES_H)
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# include <inttypes.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <time.h>
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#include <unistd.h>
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#include <sudo_compat.h>
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#include <sudo_conf.h>
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#include <sudo_debug.h>
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#include <sudo_event.h>
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#include <sudo_eventlog.h>
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#include <sudo_fatal.h>
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#include <sudo_gettext.h>
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#include <sudo_iolog.h>
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#include <sudo_queue.h>
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#include <sudo_util.h>
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#include <logsrvd.h>
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#if defined(HAVE_STRUCT_DIRENT_D_NAMLEN) && HAVE_STRUCT_DIRENT_D_NAMLEN
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# define NAMLEN(dirent) (dirent)->d_namlen
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#else
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#endif
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static struct outgoing_journal_queue outgoing_journal_queue =
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TAILQ_HEAD_INITIALIZER(outgoing_journal_queue);
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static struct sudo_event *outgoing_queue_event;
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/*
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* Callback that runs when the outgoing queue retry timer fires.
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* Tries to relay the first entry in the outgoing queue.
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*/
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static void
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outgoing_queue_cb(int unused, int what, void *v)
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{
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struct connection_closure *closure;
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struct outgoing_journal *oj, *next;
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struct sudo_event_base *evbase = v;
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bool success = false;
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debug_decl(outgoing_queue_cb, SUDO_DEBUG_UTIL);
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/* Must have at least one relay server. */
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if (TAILQ_EMPTY(logsrvd_conf_relay_address()))
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debug_return;
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/* Process first journal. */
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TAILQ_FOREACH_SAFE(oj, &outgoing_journal_queue, entries, next) {
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FILE *fp;
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int fd;
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fd = open(oj->journal_path, O_RDWR);
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if (fd == -1) {
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if (errno == ENOENT) {
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TAILQ_REMOVE(&outgoing_journal_queue, oj, entries);
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free(oj->journal_path);
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free(oj);
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}
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continue;
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}
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if (!sudo_lock_file(fd, SUDO_TLOCK)) {
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sudo_warn(U_("unable to lock %s"), oj->journal_path);
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close(fd);
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continue;
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}
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fp = fdopen(fd, "r");
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if (fp == NULL) {
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sudo_warn(U_("unable to open %s"), oj->journal_path);
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close(fd);
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break;
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}
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/* Allocate a connection closure and fill in journal vars. */
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closure = connection_closure_alloc(fd, false, true, evbase);
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if (closure == NULL) {
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fclose(fp);
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break;
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}
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closure->journal = fp;
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closure->journal_path = oj->journal_path;
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/* Done with oj now, closure owns journal_path. */
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TAILQ_REMOVE(&outgoing_journal_queue, oj, entries);
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free(oj);
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success = connect_relay(closure);
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if (!success) {
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sudo_warnx("%s", U_("unable to connect to relay"));
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connection_close(closure);
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}
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break;
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}
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}
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/*
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* Schedule the outgoing_queue_event, creating it as necessary.
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* The event will fire after the specified timeout elapses.
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*/
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bool
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logsrvd_queue_enable(time_t timeout, struct sudo_event_base *evbase)
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{
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debug_decl(logsrvd_queue_enable, SUDO_DEBUG_UTIL);
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if (!TAILQ_EMPTY(&outgoing_journal_queue)) {
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struct timespec tv = { timeout, 0 };
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if (outgoing_queue_event == NULL) {
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outgoing_queue_event = sudo_ev_alloc(-1, SUDO_EV_TIMEOUT,
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outgoing_queue_cb, evbase);
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if (outgoing_queue_event == NULL) {
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sudo_warnx(U_("%s: %s"), __func__,
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U_("unable to allocate memory"));
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debug_return_bool(false);
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}
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}
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if (sudo_ev_add(evbase, outgoing_queue_event, &tv, false) == -1) {
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sudo_warnx("%s", U_("unable to add event to queue"));
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debug_return_bool(false);
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}
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}
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debug_return_bool(true);
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}
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/*
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* Allocate a queue item based on the connection and push it on
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* the outgoing queue.
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* Consumes journal_path from the closure.
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*/
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bool
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logsrvd_queue_insert(struct connection_closure *closure)
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{
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struct outgoing_journal *oj;
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debug_decl(logsrvd_queue_insert, SUDO_DEBUG_UTIL);
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if (closure->journal_path == NULL) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
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"missing journal_path for closure %p", closure);
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debug_return_bool(false);
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}
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if ((oj = malloc(sizeof(*oj))) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_bool(false);
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}
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oj->journal_path = closure->journal_path;
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closure->journal_path = NULL;
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TAILQ_INSERT_TAIL(&outgoing_journal_queue, oj, entries);
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if (!logsrvd_queue_enable(logsrvd_conf_relay_retry_interval(),
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closure->evbase))
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debug_return_bool(false);
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debug_return_bool(true);
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}
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/*
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* Scan the outgoing queue at startup and populate the
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* outgoing_journal_queue.
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*/
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bool
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logsrvd_queue_scan(struct sudo_event_base *evbase)
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{
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char path[PATH_MAX];
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struct dirent *dent;
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size_t prefix_len;
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int dirlen;
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DIR *dirp;
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debug_decl(logsrvd_queue_scan, SUDO_DEBUG_UTIL);
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/* Must have at least one relay server. */
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if (TAILQ_EMPTY(logsrvd_conf_relay_address()))
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debug_return_bool(true);
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dirlen = snprintf(path, sizeof(path), "%s/outgoing/%s",
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logsrvd_conf_relay_dir(), RELAY_TEMPLATE);
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if (dirlen >= ssizeof(path)) {
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errno = ENAMETOOLONG;
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sudo_warn("%s/outgoing/%s", logsrvd_conf_relay_dir(), RELAY_TEMPLATE);
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debug_return_bool(false);
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}
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dirlen -= (int)sizeof(RELAY_TEMPLATE) - 1;
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path[dirlen] = '\0';
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dirp = opendir(path);
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if (dirp == NULL) {
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sudo_warn("opendir %s", path);
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debug_return_bool(false);
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}
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prefix_len = strcspn(RELAY_TEMPLATE, "X");
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while ((dent = readdir(dirp)) != NULL) {
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struct outgoing_journal *oj;
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/* Skip anything that is not a relay temp file. */
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if (NAMLEN(dent) != sizeof(RELAY_TEMPLATE) - 1)
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continue;
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if (strncmp(dent->d_name, RELAY_TEMPLATE, prefix_len) != 0)
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continue;
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/* Add to queue. */
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path[dirlen] = '\0';
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if (strlcat(path, dent->d_name, sizeof(path)) >= sizeof(path))
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continue;
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if ((oj = malloc(sizeof(*oj))) == NULL)
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goto oom;
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if ((oj->journal_path = strdup(path)) == NULL) {
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free(oj);
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goto oom;
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}
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TAILQ_INSERT_TAIL(&outgoing_journal_queue, oj, entries);
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}
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closedir(dirp);
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/* Process the queue immediately. */
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if (!logsrvd_queue_enable(0, evbase))
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debug_return_bool(false);
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debug_return_bool(true);
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oom:
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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closedir(dirp);
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debug_return_bool(false);
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}
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/*
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* Dump outgoing queue in response to SIGUSR1.
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*/
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void
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logsrvd_queue_dump(void)
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{
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struct outgoing_journal *oj;
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debug_decl(logsrvd_queue_dump, SUDO_DEBUG_UTIL);
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if (TAILQ_EMPTY(&outgoing_journal_queue))
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debug_return;
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sudo_debug_printf(SUDO_DEBUG_INFO, "outgoing journal queue:");
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TAILQ_FOREACH(oj, &outgoing_journal_queue, entries) {
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sudo_debug_printf(SUDO_DEBUG_INFO, " %s", oj->journal_path);
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}
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}
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