mirror of https://github.com/sudo-project/sudo.git
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2010-2015 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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#ifdef HAVE_LINUX_AUDIT
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <libaudit.h>
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#include <sudoers.h>
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#include <linux_audit.h>
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#define AUDIT_NOT_CONFIGURED -2
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/*
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* Open audit connection if possible.
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* Returns audit fd on success and -1 on failure.
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*/
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static int
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linux_audit_open(void)
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{
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static int au_fd = -1;
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debug_decl(linux_audit_open, SUDOERS_DEBUG_AUDIT);
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if (au_fd != -1)
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debug_return_int(au_fd);
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au_fd = audit_open();
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if (au_fd == -1) {
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/* Kernel may not have audit support. */
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if (errno == EINVAL || errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT)
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au_fd = AUDIT_NOT_CONFIGURED;
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else
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sudo_warn("%s", U_("unable to open audit system"));
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} else if (fcntl(au_fd, F_SETFD, FD_CLOEXEC) == -1) {
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sudo_warn("%s", U_("unable to open audit system"));
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audit_close(au_fd);
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au_fd = -1;
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}
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debug_return_int(au_fd);
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}
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int
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linux_audit_command(char *const argv[], int result)
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{
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int au_fd, rc = -1;
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char *cp, *command = NULL;
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char * const *av;
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size_t size, n;
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debug_decl(linux_audit_command, SUDOERS_DEBUG_AUDIT);
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/* Don't return an error if auditing is not configured. */
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if ((au_fd = linux_audit_open()) < 0)
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debug_return_int(au_fd == AUDIT_NOT_CONFIGURED ? 0 : -1);
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/* Convert argv to a flat string. */
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for (size = 0, av = argv; *av != NULL; av++)
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size += strlen(*av) + 1;
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if (size != 0)
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command = malloc(size);
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if (command == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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goto done;
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}
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for (av = argv, cp = command; *av != NULL; av++) {
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const size_t rem = size - (size_t)(cp - command);
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n = strlcpy(cp, *av, rem);
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if (n >= rem) {
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sudo_warnx(U_("internal error, %s overflow"), __func__);
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goto done;
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}
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cp += n;
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*cp++ = ' ';
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}
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*--cp = '\0';
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/* Log command, ignoring ECONNREFUSED on error. */
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if (audit_log_user_command(au_fd, AUDIT_USER_CMD, command, NULL, result) <= 0) {
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if (errno != ECONNREFUSED) {
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sudo_warn("%s", U_("unable to send audit message"));
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goto done;
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}
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}
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rc = 0;
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done:
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free(command);
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debug_return_int(rc);
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}
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#endif /* HAVE_LINUX_AUDIT */
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