1#include <stddef.h>
2#include <stdio.h>
3#include <stdint.h>
4#include <string.h>
5#include <stdlib.h>
6#include <pwd.h>
7#include <unistd.h>
8
9extern "C" {
10
11#include "hostfile.h"
12#include "auth.h"
13#include "auth-options.h"
14#include "sshkey.h"
15
16// testdata/id_ed25519.pub and testdata/id_ed25519-cert.pub
17const char *pubkey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDPQXmEVMVLmeFRyafKMVWgPDkv8/uRBTwmcEDatZzMD";
18const char *certtext = "ssh-ed25519-cert-v01@openssh.com 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 id_ed25519.pub";
19
20// stubs
21void auth_debug_add(const char *fmt,...)
22{
23}
24
25void
26auth_log_authopts(const char *loc, const struct sshauthopt *opts, int do_remote)
27{
28}
29
30int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
31{
32	char *tmp, *o, *cp = (char *)malloc(size + 1 + strlen(pubkey) + 1);
33	struct sshauthopt *opts = NULL;
34	struct passwd *pw = getpwuid(getuid());
35	static struct sshkey *key, *cert;
36
37	if (key == NULL) {
38		if ((key = sshkey_new(KEY_UNSPEC)) == NULL ||
39		    (cert = sshkey_new(KEY_UNSPEC)) == NULL)
40			abort();
41		if ((o = tmp = strdup(pubkey)) == NULL ||
42		    sshkey_read(key, &tmp) != 0)
43			abort();
44		free(o);
45		if ((o = tmp = strdup(certtext)) == NULL ||
46		    sshkey_read(cert, &tmp) != 0)
47			abort();
48		free(o);
49	}
50	if (cp == NULL || pw == NULL || key == NULL || cert == NULL)
51		abort();
52
53	// Cleanup whitespace at input EOL.
54	for (; size > 0 && strchr(" \t\r\n", data[size - 1]) != NULL; size--) ;
55
56	// Append a pubkey that will match.
57	memcpy(cp, data, size);
58	cp[size] = ' ';
59	memcpy(cp + size + 1, pubkey, strlen(pubkey) + 1);
60
61	// Try key.
62	if ((tmp = strdup(cp)) == NULL)
63		abort();
64	(void) auth_check_authkey_line(pw, key, tmp, "127.0.0.1", "localhost",
65	    "fuzz", &opts);
66	free(tmp);
67	sshauthopt_free(opts);
68
69	// Try cert.
70	if ((tmp = strdup(cp)) == NULL)
71		abort();
72	(void) auth_check_authkey_line(pw, cert, tmp, "127.0.0.1", "localhost",
73	    "fuzz", &opts);
74	free(tmp);
75	sshauthopt_free(opts);
76
77	free(cp);
78	return 0;
79}
80
81} // extern "C"
82