1 files changed, 139 insertions, 0 deletions
diff --git a/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c
new file mode 100644
index 0000000..39cd663
--- /dev/null
+++ b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2021-2022 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.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <regex.h>
+#include <time.h>
+#include <unistd.h>
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+
+#include "sudo_compat.h"
+#include "sudo_conf.h"
+#include "sudo_debug.h"
+#include "sudo_eventlog.h"
+#include "sudo_fatal.h"
+#include "sudo_iolog.h"
+#include "sudo_plugin.h"
+#include "sudo_util.h"
+
+#include "logsrvd.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+
+/*
+ * Stub version that always succeeds for small inputs and fails for large.
+ * We want to fuzz our parser, not libc's regular expression code.
+ */
+bool
+sudo_regex_compile_v1(void *v, const char *pattern, const char **errstr)
+{
+    regex_t *preg = v;
+
+    if (strlen(pattern) > 32) {
+	*errstr = "invalid regular expression";
+	return false;
+    }
+
+    /* hopefully avoid regfree() crashes */
+    memset(preg, 0, sizeof(*preg));
+    return true;
+}
+
+static int
+fuzz_conversation(int num_msgs, const struct sudo_conv_message msgs[],
+    struct sudo_conv_reply replies[], struct sudo_conv_callback *callback)
+{
+    int n;
+
+    for (n = 0; n < num_msgs; n++) {
+	const struct sudo_conv_message *msg = &msgs[n];
+
+	switch (msg->msg_type & 0xff) {
+	    case SUDO_CONV_PROMPT_ECHO_ON:
+	    case SUDO_CONV_PROMPT_MASK:
+	    case SUDO_CONV_PROMPT_ECHO_OFF:
+		/* input not supported */
+		return -1;
+	    case SUDO_CONV_ERROR_MSG:
+	    case SUDO_CONV_INFO_MSG:
+		/* no output for fuzzers */
+		break;
+	    default:
+		return -1;
+	}
+    }
+    return 0;
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    char tempfile[] = "/tmp/logsrvd_conf.XXXXXX";
+    size_t nwritten;
+    int fd;
+
+    initprogname("fuzz_logsrvd_conf");
+    if (getenv("SUDO_FUZZ_VERBOSE") == NULL)
+	sudo_warn_set_conversation(fuzz_conversation);
+
+    /* logsrvd_conf_read() uses a conf file path, not an open file. */
+    fd = mkstemp(tempfile);
+    if (fd == -1)
+	return 0;
+    nwritten = write(fd, data, size);
+    if (nwritten != size) {
+	close(fd);
+	return 0;
+    }
+    close(fd);
+
+    if (logsrvd_conf_read(tempfile)) {
+	/* public config getters */
+	logsrvd_conf_iolog_dir();
+	logsrvd_conf_iolog_file();
+	logsrvd_conf_iolog_mode();
+	logsrvd_conf_pid_file();
+	logsrvd_conf_relay_address();
+	logsrvd_conf_relay_connect_timeout();
+	logsrvd_conf_relay_tcp_keepalive();
+	logsrvd_conf_relay_timeout();
+	logsrvd_conf_server_listen_address();
+	logsrvd_conf_server_tcp_keepalive();
+	logsrvd_conf_server_timeout();
+
+	/* free config */
+	logsrvd_conf_cleanup();
+    }
+
+    unlink(tempfile);
+
+    fflush(stdout);
+
+    return 0;
+}