2220f55aef
If we fail to audit an otherwise successful command, return an error from the policy. For Linux audit, sudo may be compiled with audit support but auditing may not be setup, so we don't consider that an error.
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/*
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* Copyright (c) 2010-2014 Todd C. Miller <Todd.Miller@courtesan.com>
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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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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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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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#define DEFAULT_TEXT_DOMAIN "sudoers"
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#include "gettext.h" /* must be included before missing.h */
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#include "missing.h"
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#include "fatal.h"
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#include "alloc.h"
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#include "sudo_debug.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, SUDO_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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warning(U_("unable to open audit system"));
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au_fd == AUDIT_NOT_CONFIGURED;
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}
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} else {
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(void)fcntl(au_fd, F_SETFD, FD_CLOEXEC);
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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 *argv[], int result)
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{
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int au_fd, rc = -1;
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char *command, *cp, **av;
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size_t size, n;
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debug_decl(linux_audit_command, SUDO_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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command = cp = emalloc(size);
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for (av = argv; *av != NULL; av++) {
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n = strlcpy(cp, *av, size - (cp - command));
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if (n >= size - (cp - command)) {
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warningx(U_("internal error, %s overflow"),
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"linux_audit_command()");
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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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warning(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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efree(command);
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debug_return_int(rc);
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}
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