1 files changed, 116 insertions, 0 deletions
diff --git a/plugins/sudoers/linux_audit.c b/plugins/sudoers/linux_audit.c
new file mode 100644
index 0000000..e5eb2c2
--- /dev/null
+++ b/plugins/sudoers/linux_audit.c
@@ -0,0 +1,116 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2010-2015 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>
+
+#ifdef HAVE_LINUX_AUDIT
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <libaudit.h>
+
+#include "sudoers.h"
+#include "linux_audit.h"
+
+#define AUDIT_NOT_CONFIGURED	-2
+
+/*
+ * Open audit connection if possible.
+ * Returns audit fd on success and -1 on failure.
+ */
+static int
+linux_audit_open(void)
+{
+    static int au_fd = -1;
+    debug_decl(linux_audit_open, SUDOERS_DEBUG_AUDIT);
+
+    if (au_fd != -1)
+	debug_return_int(au_fd);
+    au_fd = audit_open();
+    if (au_fd == -1) {
+	/* Kernel may not have audit support. */
+	if (errno == EINVAL || errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT)
+	    au_fd = AUDIT_NOT_CONFIGURED;
+	else
+	    sudo_warn("%s", U_("unable to open audit system"));
+    } else if (fcntl(au_fd, F_SETFD, FD_CLOEXEC) == -1) {
+	sudo_warn("%s", U_("unable to open audit system"));
+	audit_close(au_fd);
+	au_fd = -1;
+    }
+    debug_return_int(au_fd);
+}
+
+int
+linux_audit_command(char *const argv[], int result)
+{
+    int au_fd, rc = -1;
+    char *cp, *command = NULL;
+    char * const *av;
+    size_t size, n;
+    debug_decl(linux_audit_command, SUDOERS_DEBUG_AUDIT);
+
+    /* Don't return an error if auditing is not configured. */
+    if ((au_fd = linux_audit_open()) < 0)
+	debug_return_int(au_fd == AUDIT_NOT_CONFIGURED ? 0 : -1);
+
+    /* Convert argv to a flat string. */
+    for (size = 0, av = argv; *av != NULL; av++)
+	size += strlen(*av) + 1;
+    if (size != 0)
+	command = malloc(size);
+    if (command == NULL) {
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	goto done;
+    }
+    for (av = argv, cp = command; *av != NULL; av++) {
+	n = strlcpy(cp, *av, size - (cp - command));
+	if (n >= size - (cp - command)) {
+	    sudo_warnx(U_("internal error, %s overflow"), __func__);
+	    goto done;
+	}
+	cp += n;
+	*cp++ = ' ';
+    }
+    *--cp = '\0';
+
+    /* Log command, ignoring ECONNREFUSED on error. */
+    if (audit_log_user_command(au_fd, AUDIT_USER_CMD, command, NULL, result) <= 0) {
+	if (errno != ECONNREFUSED) {
+	    sudo_warn("%s", U_("unable to send audit message"));
+	    goto done;
+	}
+    }
+
+    rc = 0;
+
+done:
+    free(command);
+
+    debug_return_int(rc);
+}
+
+#endif /* HAVE_LINUX_AUDIT */