mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-14 02:59:05 +00:00
312 lines
7.6 KiB
C
312 lines
7.6 KiB
C
#include "includes.h"
|
|
|
|
#include "includes.h"
|
|
#include "fuzz.h"
|
|
#include "dbutil.h"
|
|
#include "runopts.h"
|
|
#include "crypto_desc.h"
|
|
#include "session.h"
|
|
#include "dbrandom.h"
|
|
#include "bignum.h"
|
|
#include "atomicio.h"
|
|
#include "fuzz-wrapfd.h"
|
|
|
|
struct dropbear_fuzz_options fuzz;
|
|
|
|
static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param);
|
|
static void load_fixed_hostkeys(void);
|
|
static void load_fixed_client_key(void);
|
|
|
|
void fuzz_common_setup(void) {
|
|
disallow_core();
|
|
fuzz.fuzzing = 1;
|
|
fuzz.wrapfds = 1;
|
|
fuzz.do_jmp = 1;
|
|
fuzz.input = m_malloc(sizeof(buffer));
|
|
_dropbear_log = fuzz_dropbear_log;
|
|
crypto_init();
|
|
fuzz_seed();
|
|
/* let any messages get flushed */
|
|
setlinebuf(stdout);
|
|
}
|
|
|
|
int fuzz_set_input(const uint8_t *Data, size_t Size) {
|
|
|
|
fuzz.input->data = (unsigned char*)Data;
|
|
fuzz.input->size = Size;
|
|
fuzz.input->len = Size;
|
|
fuzz.input->pos = 0;
|
|
|
|
memset(&ses, 0x0, sizeof(ses));
|
|
memset(&svr_ses, 0x0, sizeof(svr_ses));
|
|
memset(&cli_ses, 0x0, sizeof(cli_ses));
|
|
wrapfd_setup(fuzz.input);
|
|
|
|
fuzz_seed();
|
|
|
|
return DROPBEAR_SUCCESS;
|
|
}
|
|
|
|
#if DEBUG_TRACE
|
|
static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
|
|
if (debug_trace) {
|
|
char printbuf[1024];
|
|
vsnprintf(printbuf, sizeof(printbuf), format, param);
|
|
fprintf(stderr, "%s\n", printbuf);
|
|
}
|
|
}
|
|
#else
|
|
static void fuzz_dropbear_log(int UNUSED(priority), const char* UNUSED(format), va_list UNUSED(param)) {
|
|
/* No print */
|
|
}
|
|
#endif /* DEBUG_TRACE */
|
|
|
|
void fuzz_svr_setup(void) {
|
|
fuzz_common_setup();
|
|
|
|
_dropbear_exit = svr_dropbear_exit;
|
|
|
|
char *argv[] = {
|
|
"dropbear",
|
|
"-E",
|
|
};
|
|
|
|
int argc = sizeof(argv) / sizeof(*argv);
|
|
svr_getopts(argc, argv);
|
|
|
|
load_fixed_hostkeys();
|
|
}
|
|
|
|
void fuzz_cli_setup(void) {
|
|
fuzz_common_setup();
|
|
|
|
_dropbear_exit = cli_dropbear_exit;
|
|
_dropbear_log = cli_dropbear_log;
|
|
|
|
char *argv[] = {
|
|
"dbclient",
|
|
"-y",
|
|
"localhost",
|
|
"uptime"
|
|
};
|
|
|
|
int argc = sizeof(argv) / sizeof(*argv);
|
|
cli_getopts(argc, argv);
|
|
|
|
load_fixed_client_key();
|
|
/* Avoid password prompt */
|
|
setenv(DROPBEAR_PASSWORD_ENV, "password", 1);
|
|
}
|
|
|
|
#include "fuzz-hostkeys.c"
|
|
|
|
static void load_fixed_client_key(void) {
|
|
|
|
buffer *b = buf_new(3000);
|
|
sign_key *key;
|
|
enum signkey_type keytype;
|
|
|
|
key = new_sign_key();
|
|
keytype = DROPBEAR_SIGNKEY_ANY;
|
|
buf_putbytes(b, keyed25519, keyed25519_len);
|
|
buf_setpos(b, 0);
|
|
if (buf_get_priv_key(b, key, &keytype) == DROPBEAR_FAILURE) {
|
|
dropbear_exit("failed fixed ed25519 hostkey");
|
|
}
|
|
list_append(cli_opts.privkeys, key);
|
|
|
|
buf_free(b);
|
|
}
|
|
|
|
static void load_fixed_hostkeys(void) {
|
|
|
|
buffer *b = buf_new(3000);
|
|
enum signkey_type type;
|
|
|
|
TRACE(("load fixed hostkeys"))
|
|
|
|
svr_opts.hostkey = new_sign_key();
|
|
|
|
buf_setlen(b, 0);
|
|
buf_putbytes(b, keyr, keyr_len);
|
|
buf_setpos(b, 0);
|
|
type = DROPBEAR_SIGNKEY_RSA;
|
|
if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
|
|
dropbear_exit("failed fixed rsa hostkey");
|
|
}
|
|
|
|
buf_setlen(b, 0);
|
|
buf_putbytes(b, keyd, keyd_len);
|
|
buf_setpos(b, 0);
|
|
type = DROPBEAR_SIGNKEY_DSS;
|
|
if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
|
|
dropbear_exit("failed fixed dss hostkey");
|
|
}
|
|
|
|
buf_setlen(b, 0);
|
|
buf_putbytes(b, keye, keye_len);
|
|
buf_setpos(b, 0);
|
|
type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
|
|
if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
|
|
dropbear_exit("failed fixed ecdsa hostkey");
|
|
}
|
|
|
|
buf_setlen(b, 0);
|
|
buf_putbytes(b, keyed25519, keyed25519_len);
|
|
buf_setpos(b, 0);
|
|
type = DROPBEAR_SIGNKEY_ED25519;
|
|
if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
|
|
dropbear_exit("failed fixed ed25519 hostkey");
|
|
}
|
|
|
|
buf_free(b);
|
|
}
|
|
|
|
void fuzz_kex_fakealgos(void) {
|
|
ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
|
|
}
|
|
|
|
void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
|
|
char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
|
|
if (local_host) {
|
|
*local_host = m_strdup("fuzzlocalhost");
|
|
}
|
|
if (local_port) {
|
|
*local_port = m_strdup("1234");
|
|
}
|
|
if (remote_host) {
|
|
*remote_host = m_strdup("fuzzremotehost");
|
|
}
|
|
if (remote_port) {
|
|
*remote_port = m_strdup("9876");
|
|
}
|
|
}
|
|
|
|
/* cut down version of svr_send_msg_kexdh_reply() that skips slow maths. Still populates structures */
|
|
void fuzz_fake_send_kexdh_reply(void) {
|
|
assert(!ses.dh_K);
|
|
m_mp_alloc_init_multi(&ses.dh_K, NULL);
|
|
mp_set_ul(ses.dh_K, 12345678uL);
|
|
finish_kexhashbuf();
|
|
}
|
|
|
|
/* fake version of spawn_command() */
|
|
int fuzz_spawn_command(int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid) {
|
|
*ret_writefd = wrapfd_new();
|
|
*ret_readfd = wrapfd_new();
|
|
if (ret_errfd) {
|
|
*ret_errfd = wrapfd_new();
|
|
}
|
|
*ret_pid = 999;
|
|
return DROPBEAR_SUCCESS;
|
|
}
|
|
|
|
int fuzz_run_preauth(const uint8_t *Data, size_t Size, int skip_kexmaths) {
|
|
static int once = 0;
|
|
if (!once) {
|
|
fuzz_svr_setup();
|
|
fuzz.skip_kexmaths = skip_kexmaths;
|
|
once = 1;
|
|
}
|
|
|
|
if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
get prefix, allowing for future extensibility. input format is
|
|
string prefix
|
|
uint32 wrapfd seed
|
|
... to be extended later
|
|
[bytes] ssh input stream
|
|
*/
|
|
|
|
/* be careful to avoid triggering buffer.c assertions */
|
|
if (fuzz.input->len < 8) {
|
|
return 0;
|
|
}
|
|
size_t prefix_size = buf_getint(fuzz.input);
|
|
if (prefix_size != 4) {
|
|
return 0;
|
|
}
|
|
uint32_t wrapseed = buf_getint(fuzz.input);
|
|
wrapfd_setseed(wrapseed);
|
|
|
|
int fakesock = wrapfd_new();
|
|
|
|
m_malloc_set_epoch(1);
|
|
if (setjmp(fuzz.jmp) == 0) {
|
|
svr_session(fakesock, fakesock);
|
|
m_malloc_free_epoch(1, 0);
|
|
} else {
|
|
m_malloc_free_epoch(1, 1);
|
|
TRACE(("dropbear_exit longjmped"))
|
|
/* dropbear_exit jumped here */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fuzz_run_client(const uint8_t *Data, size_t Size, int skip_kexmaths) {
|
|
static int once = 0;
|
|
if (!once) {
|
|
fuzz_cli_setup();
|
|
fuzz.skip_kexmaths = skip_kexmaths;
|
|
once = 1;
|
|
}
|
|
|
|
if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
get prefix, allowing for future extensibility. input format is
|
|
string prefix
|
|
uint32 wrapfd seed
|
|
... to be extended later
|
|
[bytes] ssh input stream
|
|
*/
|
|
|
|
/* be careful to avoid triggering buffer.c assertions */
|
|
if (fuzz.input->len < 8) {
|
|
return 0;
|
|
}
|
|
size_t prefix_size = buf_getint(fuzz.input);
|
|
if (prefix_size != 4) {
|
|
return 0;
|
|
}
|
|
uint32_t wrapseed = buf_getint(fuzz.input);
|
|
wrapfd_setseed(wrapseed);
|
|
|
|
int fakesock = wrapfd_new();
|
|
|
|
m_malloc_set_epoch(1);
|
|
if (setjmp(fuzz.jmp) == 0) {
|
|
cli_session(fakesock, fakesock, NULL, 0);
|
|
m_malloc_free_epoch(1, 0);
|
|
} else {
|
|
m_malloc_free_epoch(1, 1);
|
|
TRACE(("dropbear_exit longjmped"))
|
|
/* dropbear_exit jumped here */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const void* fuzz_get_algo(const algo_type *algos, const char* name) {
|
|
const algo_type *t;
|
|
for (t = algos; t->name; t++) {
|
|
if (strcmp(t->name, name) == 0) {
|
|
return t->data;
|
|
}
|
|
}
|
|
assert(0);
|
|
}
|
|
|
|
void fuzz_dump(const unsigned char* data, size_t len) {
|
|
TRACE(("dump %zu", len))
|
|
if (fuzz.dumping) {
|
|
assert(atomicio(vwrite, fuzz.recv_dumpfd, (void*)data, len) == len);
|
|
}
|
|
}
|