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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2009-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_eventlog.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_json.h"
#include "sudo_iolog.h"
#include "sudo_util.h"
struct eventlog *
iolog_parse_loginfo(int dfd, const char *iolog_dir)
{
struct eventlog *evlog = NULL;
FILE *fp = NULL;
int fd = -1;
int tmpfd = -1;
bool ok, legacy = false;
debug_decl(iolog_parse_loginfo, SUDO_DEBUG_UTIL);
if (dfd == -1) {
if ((tmpfd = open(iolog_dir, O_RDONLY)) == -1) {
sudo_warn("%s", iolog_dir);
goto bad;
}
dfd = tmpfd;
}
if ((fd = openat(dfd, "log.json", O_RDONLY, 0)) == -1) {
fd = openat(dfd, "log", O_RDONLY, 0);
legacy = true;
}
if (tmpfd != -1)
close(tmpfd);
if (fd == -1 || (fp = fdopen(fd, "r")) == NULL) {
sudo_warn("%s/log", iolog_dir);
goto bad;
}
fd = -1;
if ((evlog = calloc(1, sizeof(*evlog))) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
evlog->runuid = (uid_t)-1;
evlog->rungid = (gid_t)-1;
evlog->exit_value = -1;
ok = legacy ? iolog_parse_loginfo_legacy(fp, iolog_dir, evlog) :
iolog_parse_loginfo_json(fp, iolog_dir, evlog);
if (ok) {
fclose(fp);
debug_return_ptr(evlog);
}
bad:
if (fd != -1)
close(fd);
if (fp != NULL)
fclose(fp);
eventlog_free(evlog);
debug_return_ptr(NULL);
}
/*
* Write the legacy I/O log file that contains the user and command info.
* This file is not compressed.
*/
static bool
iolog_write_info_file_legacy(int dfd, struct eventlog *evlog)
{
char * const *av;
FILE *fp;
int error, fd;
debug_decl(iolog_info_write_log, SUDO_DEBUG_UTIL);
fd = iolog_openat(dfd, "log", O_CREAT|O_TRUNC|O_WRONLY);
if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to %sopen %s/log", fd == -1 ? "" : "fd", evlog->iolog_path);
if (fd != -1)
close(fd);
debug_return_bool(false);
}
if (fchown(fd, iolog_get_uid(), iolog_get_gid()) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to fchown %d:%d %s/log", __func__,
(int)iolog_get_uid(), (int)iolog_get_gid(), evlog->iolog_path);
}
fprintf(fp, "%lld:%s:%s:%s:%s:%d:%d\n%s\n",
(long long)evlog->submit_time.tv_sec,
evlog->submituser ? evlog->submituser : "unknown",
evlog->runuser ? evlog->runuser : RUNAS_DEFAULT,
evlog->rungroup ? evlog->rungroup : "",
evlog->ttyname ? evlog->ttyname : "unknown",
evlog->lines, evlog->columns,
evlog->cwd ? evlog->cwd : "unknown");
fputs(evlog->command ? evlog->command : "unknown", fp);
for (av = evlog->argv + 1; *av != NULL; av++) {
fputc(' ', fp);
fputs(*av, fp);
}
fputc('\n', fp);
fflush(fp);
if ((error = ferror(fp))) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to write to I/O log file %s/log", evlog->iolog_path);
}
fclose(fp);
debug_return_bool(!error);
}
/*
* Write the "log.json" file that contains the user and command info.
* This file is not compressed.
*/
static bool
iolog_write_info_file_json(int dfd, struct eventlog *evlog)
{
struct json_container jsonc;
struct json_value json_value;
bool ret = false;
FILE *fp = NULL;
int fd = -1;
debug_decl(iolog_write_info_file_json, SUDO_DEBUG_UTIL);
if (!sudo_json_init(&jsonc, 4, false, false, false))
debug_return_bool(false);
/* Timestamp */
if (!sudo_json_open_object(&jsonc, "timestamp"))
goto oom;
json_value.type = JSON_NUMBER;
json_value.u.number = evlog->submit_time.tv_sec;
if (!sudo_json_add_value(&jsonc, "seconds", &json_value))
goto oom;
json_value.type = JSON_NUMBER;
json_value.u.number = evlog->submit_time.tv_nsec;
if (!sudo_json_add_value(&jsonc, "nanoseconds", &json_value))
goto oom;
if (!sudo_json_close_object(&jsonc))
goto oom;
if (!eventlog_store_json(&jsonc, evlog))
goto done;
fd = iolog_openat(dfd, "log.json", O_CREAT|O_TRUNC|O_WRONLY);
if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to %sopen %s/log.json", fd == -1 ? "" : "fd",
evlog->iolog_path);
goto done;
}
if (fchown(fd, iolog_get_uid(), iolog_get_gid()) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO,
"%s: unable to fchown %d:%d %s/log.json", __func__,
(int)iolog_get_uid(), (int)iolog_get_gid(), evlog->iolog_path);
}
fd = -1;
fprintf(fp, "{%s\n}\n", sudo_json_get_buf(&jsonc));
fflush(fp);
if (ferror(fp)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
"unable to write to I/O log file %s/log.json", evlog->iolog_path);
goto done;
}
ret = true;
goto done;
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
done:
sudo_json_free(&jsonc);
if (fp != NULL)
fclose(fp);
if (fd != -1)
close(fd);
debug_return_bool(ret);
}
/*
* Write the I/O log and log.json files that contain user and command info.
* These files are not compressed.
*/
bool
iolog_write_info_file(int dfd, struct eventlog *evlog)
{
debug_decl(iolog_write_info_file, SUDO_DEBUG_UTIL);
if (!iolog_write_info_file_legacy(dfd, evlog))
debug_return_bool(false);
if (!iolog_write_info_file_json(dfd, evlog))
debug_return_bool(false);
debug_return_bool(true);
}
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