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adapt kex to sshbuf and struct ssh; ok djm@
This commit is contained in:
markus@openbsd.org 2015-01-19 20:16:15 +00:00 коммит произвёл Damien Miller
Родитель 3fdc88a0de
Коммит 57d10cbe86
24 изменённых файлов: 1698 добавлений и 1150 удалений
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13
auth.h
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: auth.h,v 1.79 2014/12/22 07:51:30 djm Exp $ */
/* $OpenBSD: auth.h,v 1.80 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
@ -42,6 +42,7 @@
#include <krb5.h>
#endif
struct ssh;
struct sshkey;
typedef struct Authctxt Authctxt;
@ -202,12 +203,12 @@ check_key_in_hostfiles(struct passwd *, Key *, const char *,
/* hostkey handling */
Key *get_hostkey_by_index(int);
Key *get_hostkey_public_by_index(int);
Key *get_hostkey_public_by_type(int);
Key *get_hostkey_private_by_type(int);
int get_hostkey_index(Key *);
Key *get_hostkey_public_by_index(int, struct ssh *);
Key *get_hostkey_public_by_type(int, struct ssh *);
Key *get_hostkey_private_by_type(int, struct ssh *);
int get_hostkey_index(Key *, struct ssh *);
int ssh1_session_key(BIGNUM *);
void sshd_hostkey_sign(Key *, Key *, u_char **, u_int *, u_char *, u_int);
int sshd_hostkey_sign(Key *, Key *, u_char **, size_t *, u_char *, size_t, u_int);
/* debug messages during authentication */
void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));

11
clientloop.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: clientloop.c,v 1.264 2015/01/19 20:07:45 markus Exp $ */
/* $OpenBSD: clientloop.c,v 1.265 2015/01/19 20:16:15 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1413,8 +1413,7 @@ client_process_output(fd_set *writeset)
static void
client_process_buffered_input_packets(void)
{
dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
compat20 ? active_state->kex : NULL);
dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
}
/* scan buf[] for '~' before sending data to the peer */
@ -1468,7 +1467,7 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
{
fd_set *readset = NULL, *writeset = NULL;
double start_time, total_time;
int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
int r, max_fd = 0, max_fd2 = 0, len, rekeying = 0;
u_int64_t ibytes, obytes;
u_int nalloc = 0;
char buf[100];
@ -1598,7 +1597,9 @@ client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
if (need_rekeying || packet_need_rekeying()) {
debug("need rekeying");
active_state->kex->done = 0;
kex_send_kexinit(active_state->kex);
if ((r = kex_send_kexinit(active_state)) != 0)
fatal("%s: kex_send_kexinit: %s",
__func__, ssh_err(r));
need_rekeying = 0;
}
}

59
dh.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: dh.c,v 1.53 2013/11/21 00:45:44 djm Exp $ */
/* $OpenBSD: dh.c,v 1.54 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
*
@ -39,6 +39,7 @@
#include "pathnames.h"
#include "log.h"
#include "misc.h"
#include "ssherr.h"
static int
parse_prime(int linenum, char *line, struct dhgroup *dhg)
@ -107,10 +108,11 @@ parse_prime(int linenum, char *line, struct dhgroup *dhg)
goto fail;
}
if ((dhg->g = BN_new()) == NULL)
fatal("parse_prime: BN_new failed");
if ((dhg->p = BN_new()) == NULL)
fatal("parse_prime: BN_new failed");
if ((dhg->g = BN_new()) == NULL ||
(dhg->p = BN_new()) == NULL) {
error("parse_prime: BN_new failed");
goto fail;
}
if (BN_hex2bn(&dhg->g, gen) == 0) {
error("moduli:%d: could not parse generator value", linenum);
goto fail;
@ -128,7 +130,6 @@ parse_prime(int linenum, char *line, struct dhgroup *dhg)
error("moduli:%d: generator is invalid", linenum);
goto fail;
}
return 1;
fail:
@ -137,7 +138,6 @@ parse_prime(int linenum, char *line, struct dhgroup *dhg)
if (dhg->p != NULL)
BN_clear_free(dhg->p);
dhg->g = dhg->p = NULL;
error("Bad prime description in line %d", linenum);
return 0;
}
@ -200,9 +200,11 @@ choose_dh(int min, int wantbits, int max)
break;
}
fclose(f);
if (linenum != which+1)
fatal("WARNING: line %d disappeared in %s, giving up",
if (linenum != which+1) {
logit("WARNING: line %d disappeared in %s, giving up",
which, _PATH_DH_PRIMES);
return (dh_new_group14());
}
return (dh_new_group(dhg.g, dhg.p));
}
@ -251,22 +253,22 @@ dh_pub_is_valid(DH *dh, BIGNUM *dh_pub)
return 0;
}
void
int
dh_gen_key(DH *dh, int need)
{
int pbits;
if (need <= 0)
fatal("%s: need <= 0", __func__);
if (dh->p == NULL)
fatal("%s: dh->p == NULL", __func__);
if ((pbits = BN_num_bits(dh->p)) <= 0)
fatal("%s: bits(p) <= 0", __func__);
if (need < 0 || dh->p == NULL ||
(pbits = BN_num_bits(dh->p)) <= 0 ||
need > INT_MAX / 2 || 2 * need >= pbits)
return SSH_ERR_INVALID_ARGUMENT;
dh->length = MIN(need * 2, pbits - 1);
if (DH_generate_key(dh) == 0)
fatal("%s: key generation failed", __func__);
if (!dh_pub_is_valid(dh, dh->pub_key))
fatal("%s: generated invalid key", __func__);
if (DH_generate_key(dh) == 0 ||
!dh_pub_is_valid(dh, dh->pub_key)) {
BN_clear_free(dh->priv_key);
return SSH_ERR_LIBCRYPTO_ERROR;
}
return 0;
}
DH *
@ -275,13 +277,12 @@ dh_new_group_asc(const char *gen, const char *modulus)
DH *dh;
if ((dh = DH_new()) == NULL)
fatal("dh_new_group_asc: DH_new");
if (BN_hex2bn(&dh->p, modulus) == 0)
fatal("BN_hex2bn p");
if (BN_hex2bn(&dh->g, gen) == 0)
fatal("BN_hex2bn g");
return NULL;
if (BN_hex2bn(&dh->p, modulus) == 0 ||
BN_hex2bn(&dh->g, gen) == 0) {
DH_free(dh);
return NULL;
}
return (dh);
}
@ -296,7 +297,7 @@ dh_new_group(BIGNUM *gen, BIGNUM *modulus)
DH *dh;
if ((dh = DH_new()) == NULL)
fatal("dh_new_group: DH_new");
return NULL;
dh->p = modulus;
dh->g = gen;
@ -344,7 +345,7 @@ dh_new_group14(void)
* from RFC4419 section 3.
*/
int
u_int
dh_estimate(int bits)
{
if (bits <= 112)

6
dh.h
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: dh.h,v 1.11 2013/10/08 11:42:13 dtucker Exp $ */
/* $OpenBSD: dh.h,v 1.12 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
@ -38,10 +38,10 @@ DH *dh_new_group(BIGNUM *, BIGNUM *);
DH *dh_new_group1(void);
DH *dh_new_group14(void);
void dh_gen_key(DH *, int);
int dh_gen_key(DH *, int);
int dh_pub_is_valid(DH *, BIGNUM *);
int dh_estimate(int);
u_int dh_estimate(int);
/* Min and max values from RFC4419. */
#define DH_GRP_MIN 1024

569
kex.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kex.c,v 1.101 2015/01/19 20:07:45 markus Exp $ */
/* $OpenBSD: kex.c,v 1.102 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
*
@ -37,20 +37,22 @@
#include <openssl/crypto.h>
#endif
#include "xmalloc.h"
#include "ssh2.h"
#include "buffer.h"
#include "packet.h"
#include "compat.h"
#include "cipher.h"
#include "key.h"
#include "sshkey.h"
#include "kex.h"
#include "log.h"
#include "mac.h"
#include "match.h"
#include "misc.h"
#include "dispatch.h"
#include "monitor.h"
#include "roaming.h"
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
@ -62,12 +64,12 @@ extern const EVP_MD *evp_ssh_sha256(void);
#endif
/* prototype */
static void kex_kexinit_finish(Kex *);
static void kex_choose_conf(Kex *);
static int kex_choose_conf(struct ssh *);
static int kex_input_newkeys(int, u_int32_t, void *);
struct kexalg {
char *name;
int type;
u_int type;
int ec_nid;
int hash_alg;
};
@ -99,7 +101,7 @@ static const struct kexalg kexalgs[] = {
char *
kex_alg_list(char sep)
{
char *ret = NULL;
char *ret = NULL, *tmp;
size_t nlen, rlen = 0;
const struct kexalg *k;
@ -107,7 +109,11 @@ kex_alg_list(char sep)
if (ret != NULL)
ret[rlen++] = sep;
nlen = strlen(k->name);
ret = xrealloc(ret, 1, rlen + nlen + 2);
if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
free(ret);
return NULL;
}
ret = tmp;
memcpy(ret + rlen, k->name, nlen + 1);
rlen += nlen;
}
@ -134,7 +140,8 @@ kex_names_valid(const char *names)
if (names == NULL || strcmp(names, "") == 0)
return 0;
s = cp = xstrdup(names);
if ((s = cp = strdup(names)) == NULL)
return 0;
for ((p = strsep(&cp, ",")); p && *p != '\0';
(p = strsep(&cp, ","))) {
if (kex_alg_by_name(p) == NULL) {
@ -149,56 +156,75 @@ kex_names_valid(const char *names)
}
/* put algorithm proposal into buffer */
static void
kex_prop2buf(Buffer *b, char *proposal[PROPOSAL_MAX])
int
kex_prop2buf(struct sshbuf *b, char *proposal[PROPOSAL_MAX])
{
u_int i;
int r;
sshbuf_reset(b);
buffer_clear(b);
/*
* add a dummy cookie, the cookie will be overwritten by
* kex_send_kexinit(), each time a kexinit is set
*/
for (i = 0; i < KEX_COOKIE_LEN; i++)
buffer_put_char(b, 0);
for (i = 0; i < PROPOSAL_MAX; i++)
buffer_put_cstring(b, proposal[i]);
buffer_put_char(b, 0); /* first_kex_packet_follows */
buffer_put_int(b, 0); /* uint32 reserved */
for (i = 0; i < KEX_COOKIE_LEN; i++) {
if ((r = sshbuf_put_u8(b, 0)) != 0)
return r;
}
for (i = 0; i < PROPOSAL_MAX; i++) {
if ((r = sshbuf_put_cstring(b, proposal[i])) != 0)
return r;
}
if ((r = sshbuf_put_u8(b, 0)) != 0 || /* first_kex_packet_follows */
(r = sshbuf_put_u32(b, 0)) != 0) /* uint32 reserved */
return r;
return 0;
}
/* parse buffer and return algorithm proposal */
static char **
kex_buf2prop(Buffer *raw, int *first_kex_follows)
int
kex_buf2prop(struct sshbuf *raw, int *first_kex_follows, char ***propp)
{
Buffer b;
struct sshbuf *b = NULL;
u_char v;
u_int i;
char **proposal;
char **proposal = NULL;
int r;
proposal = xcalloc(PROPOSAL_MAX, sizeof(char *));
buffer_init(&b);
buffer_append(&b, buffer_ptr(raw), buffer_len(raw));
/* skip cookie */
for (i = 0; i < KEX_COOKIE_LEN; i++)
buffer_get_char(&b);
*propp = NULL;
if ((proposal = calloc(PROPOSAL_MAX, sizeof(char *))) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((b = sshbuf_fromb(raw)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshbuf_consume(b, KEX_COOKIE_LEN)) != 0) /* skip cookie */
goto out;
/* extract kex init proposal strings */
for (i = 0; i < PROPOSAL_MAX; i++) {
proposal[i] = buffer_get_cstring(&b,NULL);
if ((r = sshbuf_get_cstring(b, &(proposal[i]), NULL)) != 0)
goto out;
debug2("kex_parse_kexinit: %s", proposal[i]);
}
/* first kex follows / reserved */
i = buffer_get_char(&b);
if ((r = sshbuf_get_u8(b, &v)) != 0 ||
(r = sshbuf_get_u32(b, &i)) != 0)
goto out;
if (first_kex_follows != NULL)
*first_kex_follows = i;
debug2("kex_parse_kexinit: first_kex_follows %d ", i);
i = buffer_get_int(&b);
debug2("kex_parse_kexinit: first_kex_follows %d ", v);
debug2("kex_parse_kexinit: reserved %u ", i);
buffer_free(&b);
return proposal;
r = 0;
*propp = proposal;
out:
if (r != 0 && proposal != NULL)
kex_prop_free(proposal);
sshbuf_free(b);
return r;
}
static void
void
kex_prop_free(char **proposal)
{
u_int i;
@ -217,91 +243,103 @@ kex_protocol_error(int type, u_int32_t seq, void *ctxt)
}
static void
kex_reset_dispatch(void)
kex_reset_dispatch(struct ssh *ssh)
{
dispatch_range(SSH2_MSG_TRANSPORT_MIN,
ssh_dispatch_range(ssh, SSH2_MSG_TRANSPORT_MIN,
SSH2_MSG_TRANSPORT_MAX, &kex_protocol_error);
dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
}
void
kex_finish(Kex *kex)
int
kex_send_newkeys(struct ssh *ssh)
{
kex_reset_dispatch();
int r;
packet_start(SSH2_MSG_NEWKEYS);
packet_send();
/* packet_write_wait(); */
kex_reset_dispatch(ssh);
if ((r = sshpkt_start(ssh, SSH2_MSG_NEWKEYS)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
return r;
debug("SSH2_MSG_NEWKEYS sent");
debug("expecting SSH2_MSG_NEWKEYS");
packet_read_expect(SSH2_MSG_NEWKEYS);
packet_check_eom();
debug("SSH2_MSG_NEWKEYS received");
ssh_dispatch_set(ssh, SSH2_MSG_NEWKEYS, &kex_input_newkeys);
return 0;
}
static int
kex_input_newkeys(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
int r;
debug("SSH2_MSG_NEWKEYS received");
ssh_dispatch_set(ssh, SSH2_MSG_NEWKEYS, &kex_protocol_error);
if ((r = sshpkt_get_end(ssh)) != 0)
return r;
kex->done = 1;
buffer_clear(kex->peer);
/* buffer_clear(kex->my); */
sshbuf_reset(kex->peer);
/* sshbuf_reset(kex->my); */
kex->flags &= ~KEX_INIT_SENT;
free(kex->name);
kex->name = NULL;
return 0;
}
void
kex_send_kexinit(Kex *kex)
int
kex_send_kexinit(struct ssh *ssh)
{
u_int32_t rnd = 0;
u_char *cookie;
u_int i;
struct kex *kex = ssh->kex;
int r;
if (kex == NULL) {
error("kex_send_kexinit: no kex, cannot rekey");
return;
}
if (kex->flags & KEX_INIT_SENT) {
debug("KEX_INIT_SENT");
return;
}
if (kex == NULL)
return SSH_ERR_INTERNAL_ERROR;
if (kex->flags & KEX_INIT_SENT)
return 0;
kex->done = 0;
/* generate a random cookie */
if (buffer_len(kex->my) < KEX_COOKIE_LEN)
fatal("kex_send_kexinit: kex proposal too short");
cookie = buffer_ptr(kex->my);
for (i = 0; i < KEX_COOKIE_LEN; i++) {
if (i % 4 == 0)
rnd = arc4random();
cookie[i] = rnd;
rnd >>= 8;
}
packet_start(SSH2_MSG_KEXINIT);
packet_put_raw(buffer_ptr(kex->my), buffer_len(kex->my));
packet_send();
if (sshbuf_len(kex->my) < KEX_COOKIE_LEN)
return SSH_ERR_INVALID_FORMAT;
if ((cookie = sshbuf_mutable_ptr(kex->my)) == NULL)
return SSH_ERR_INTERNAL_ERROR;
arc4random_buf(cookie, KEX_COOKIE_LEN);
if ((r = sshpkt_start(ssh, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshpkt_putb(ssh, kex->my)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
return r;
debug("SSH2_MSG_KEXINIT sent");
kex->flags |= KEX_INIT_SENT;
return 0;
}
/* ARGSUSED */
int
kex_input_kexinit(int type, u_int32_t seq, void *ctxt)
{
const char *ptr;
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
const u_char *ptr;
u_int i;
size_t dlen;
Kex *kex = (Kex *)ctxt;
int r;
debug("SSH2_MSG_KEXINIT received");
if (kex == NULL)
fatal("kex_input_kexinit: no kex, cannot rekey");
return SSH_ERR_INVALID_ARGUMENT;
ptr = packet_get_raw(&dlen);
buffer_append(kex->peer, ptr, dlen);
ptr = sshpkt_ptr(ssh, &dlen);
if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0)
return r;
/* discard packet */
for (i = 0; i < KEX_COOKIE_LEN; i++)
packet_get_char();
if ((r = sshpkt_get_u8(ssh, NULL)) != 0)
return r;
for (i = 0; i < PROPOSAL_MAX; i++)
free(packet_get_string(NULL));
if ((r = sshpkt_get_string(ssh, NULL, NULL)) != 0)
return r;
/*
* XXX RFC4253 sec 7: "each side MAY guess" - currently no supported
* KEX method has the server move first, but a server might be using
@ -312,12 +350,47 @@ kex_input_kexinit(int type, u_int32_t seq, void *ctxt)
* for cases where the server *doesn't* go first. I guess we should
* ignore it when it is set for these cases, which is what we do now.
*/
(void) packet_get_char(); /* first_kex_follows */
(void) packet_get_int(); /* reserved */
packet_check_eom();
if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || /* first_kex_follows */
(r = sshpkt_get_u32(ssh, NULL)) != 0 || /* reserved */
(r = sshpkt_get_end(ssh)) != 0)
return r;
kex_kexinit_finish(kex);
return 0;
if (!(kex->flags & KEX_INIT_SENT))
if ((r = kex_send_kexinit(ssh)) != 0)
return r;
if ((r = kex_choose_conf(ssh)) != 0)
return r;
if (kex->kex_type < KEX_MAX && kex->kex[kex->kex_type] != NULL)
return (kex->kex[kex->kex_type])(ssh);
return SSH_ERR_INTERNAL_ERROR;
}
int
kex_new(struct ssh *ssh, char *proposal[PROPOSAL_MAX], struct kex **kexp)
{
struct kex *kex;
int r;
*kexp = NULL;
if ((kex = calloc(1, sizeof(*kex))) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((kex->peer = sshbuf_new()) == NULL ||
(kex->my = sshbuf_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = kex_prop2buf(kex->my, proposal)) != 0)
goto out;
kex->done = 0;
kex_reset_dispatch(ssh);
r = 0;
*kexp = kex;
out:
if (r != 0)
kex_free(kex);
return r;
}
void
@ -351,51 +424,53 @@ kex_free_newkeys(struct newkeys *newkeys)
free(newkeys);
}
Kex *
kex_setup(char *proposal[PROPOSAL_MAX])
void
kex_free(struct kex *kex)
{
struct kex *kex;
u_int mode;
if ((kex = calloc(1, sizeof(*kex))) == NULL)
fatal("%s: calloc", __func__);
if ((kex->peer = sshbuf_new()) == NULL ||
(kex->my = sshbuf_new()) == NULL) {
fatal("%s: sshbuf_new", __func__);
#ifdef WITH_OPENSSL
if (kex->dh)
DH_free(kex->dh);
if (kex->ec_client_key)
EC_KEY_free(kex->ec_client_key);
#endif
for (mode = 0; mode < MODE_MAX; mode++) {
kex_free_newkeys(kex->newkeys[mode]);
kex->newkeys[mode] = NULL;
}
kex_prop2buf(kex->my, proposal);
kex->done = 0;
kex_send_kexinit(kex); /* we start */
kex_reset_dispatch();
return kex;
sshbuf_free(kex->peer);
sshbuf_free(kex->my);
free(kex->session_id);
free(kex->client_version_string);
free(kex->server_version_string);
free(kex);
}
static void
kex_kexinit_finish(Kex *kex)
int
kex_setup(struct ssh *ssh, char *proposal[PROPOSAL_MAX])
{
if (!(kex->flags & KEX_INIT_SENT))
kex_send_kexinit(kex);
int r;
kex_choose_conf(kex);
if (kex->kex_type >= 0 && kex->kex_type < KEX_MAX &&
kex->kex[kex->kex_type] != NULL) {
(kex->kex[kex->kex_type])(kex);
} else {
fatal("Unsupported key exchange %d", kex->kex_type);
if ((r = kex_new(ssh, proposal, &ssh->kex)) != 0)
return r;
if ((r = kex_send_kexinit(ssh)) != 0) { /* we start */
kex_free(ssh->kex);
ssh->kex = NULL;
return r;
}
return 0;
}
static void
choose_enc(Enc *enc, char *client, char *server)
static int
choose_enc(struct sshenc *enc, char *client, char *server)
{
char *name = match_list(client, server, NULL);
if (name == NULL)
fatal("no matching cipher found: client %s server %s",
client, server);
return SSH_ERR_NO_CIPHER_ALG_MATCH;
if ((enc->cipher = cipher_by_name(name)) == NULL)
fatal("matching cipher is not supported: %s", name);
return SSH_ERR_INTERNAL_ERROR;
enc->name = name;
enc->enabled = 0;
enc->iv = NULL;
@ -403,31 +478,34 @@ choose_enc(Enc *enc, char *client, char *server)
enc->key = NULL;
enc->key_len = cipher_keylen(enc->cipher);
enc->block_size = cipher_blocksize(enc->cipher);
return 0;
}
static void
choose_mac(Mac *mac, char *client, char *server)
static int
choose_mac(struct ssh *ssh, struct sshmac *mac, char *client, char *server)
{
char *name = match_list(client, server, NULL);
if (name == NULL)
fatal("no matching mac found: client %s server %s",
client, server);
return SSH_ERR_NO_MAC_ALG_MATCH;
if (mac_setup(mac, name) < 0)
fatal("unsupported mac %s", name);
return SSH_ERR_INTERNAL_ERROR;
/* truncate the key */
if (datafellows & SSH_BUG_HMAC)
if (ssh->compat & SSH_BUG_HMAC)
mac->key_len = 16;
mac->name = name;
mac->key = NULL;
mac->enabled = 0;
return 0;
}
static void
choose_comp(Comp *comp, char *client, char *server)
static int
choose_comp(struct sshcomp *comp, char *client, char *server)
{
char *name = match_list(client, server, NULL);
if (name == NULL)
fatal("no matching comp found: client %s server %s", client, server);
return SSH_ERR_NO_COMPRESS_ALG_MATCH;
if (strcmp(name, "zlib@openssh.com") == 0) {
comp->type = COMP_DELAYED;
} else if (strcmp(name, "zlib") == 0) {
@ -435,36 +513,41 @@ choose_comp(Comp *comp, char *client, char *server)
} else if (strcmp(name, "none") == 0) {
comp->type = COMP_NONE;
} else {
fatal("unsupported comp %s", name);
return SSH_ERR_INTERNAL_ERROR;
}
comp->name = name;
return 0;
}
static void
choose_kex(Kex *k, char *client, char *server)
static int
choose_kex(struct kex *k, char *client, char *server)
{
const struct kexalg *kexalg;
k->name = match_list(client, server, NULL);
if (k->name == NULL)
fatal("Unable to negotiate a key exchange method");
return SSH_ERR_NO_KEX_ALG_MATCH;
if ((kexalg = kex_alg_by_name(k->name)) == NULL)
fatal("unsupported kex alg %s", k->name);
return SSH_ERR_INTERNAL_ERROR;
k->kex_type = kexalg->type;
k->hash_alg = kexalg->hash_alg;
k->ec_nid = kexalg->ec_nid;
return 0;
}
static void
choose_hostkeyalg(Kex *k, char *client, char *server)
static int
choose_hostkeyalg(struct kex *k, char *client, char *server)
{
char *hostkeyalg = match_list(client, server, NULL);
if (hostkeyalg == NULL)
fatal("no hostkey alg");
k->hostkey_type = key_type_from_name(hostkeyalg);
return SSH_ERR_NO_HOSTKEY_ALG_MATCH;
k->hostkey_type = sshkey_type_from_name(hostkeyalg);
if (k->hostkey_type == KEY_UNSPEC)
fatal("bad hostkey alg '%s'", hostkeyalg);
return SSH_ERR_INTERNAL_ERROR;
free(hostkeyalg);
return 0;
}
static int
@ -491,18 +574,20 @@ proposals_match(char *my[PROPOSAL_MAX], char *peer[PROPOSAL_MAX])
return (1);
}
static void
kex_choose_conf(Kex *kex)
static int
kex_choose_conf(struct ssh *ssh)
{
Newkeys *newkeys;
char **my, **peer;
struct kex *kex = ssh->kex;
struct newkeys *newkeys;
char **my = NULL, **peer = NULL;
char **cprop, **sprop;
int nenc, nmac, ncomp;
u_int mode, ctos, need, dh_need, authlen;
int first_kex_follows, type;
int r, first_kex_follows;
my = kex_buf2prop(kex->my, NULL);
peer = kex_buf2prop(kex->peer, &first_kex_follows);
if ((r = kex_buf2prop(kex->my, NULL, &my)) != 0 ||
(r = kex_buf2prop(kex->peer, &first_kex_follows, &peer)) != 0)
goto out;
if (kex->server) {
cprop=peer;
@ -514,8 +599,9 @@ kex_choose_conf(Kex *kex)
/* Check whether server offers roaming */
if (!kex->server) {
char *roaming;
roaming = match_list(KEX_RESUME, peer[PROPOSAL_KEX_ALGS], NULL);
char *roaming = match_list(KEX_RESUME,
peer[PROPOSAL_KEX_ALGS], NULL);
if (roaming) {
kex->roaming = 1;
free(roaming);
@ -524,28 +610,39 @@ kex_choose_conf(Kex *kex)
/* Algorithm Negotiation */
for (mode = 0; mode < MODE_MAX; mode++) {
newkeys = xcalloc(1, sizeof(*newkeys));
if ((newkeys = calloc(1, sizeof(*newkeys))) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
kex->newkeys[mode] = newkeys;
ctos = (!kex->server && mode == MODE_OUT) ||
(kex->server && mode == MODE_IN);
nenc = ctos ? PROPOSAL_ENC_ALGS_CTOS : PROPOSAL_ENC_ALGS_STOC;
nmac = ctos ? PROPOSAL_MAC_ALGS_CTOS : PROPOSAL_MAC_ALGS_STOC;
ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC;
choose_enc(&newkeys->enc, cprop[nenc], sprop[nenc]);
/* ignore mac for authenticated encryption */
if ((r = choose_enc(&newkeys->enc, cprop[nenc],
sprop[nenc])) != 0)
goto out;
authlen = cipher_authlen(newkeys->enc.cipher);
if (authlen == 0)
choose_mac(&newkeys->mac, cprop[nmac], sprop[nmac]);
choose_comp(&newkeys->comp, cprop[ncomp], sprop[ncomp]);
/* ignore mac for authenticated encryption */
if (authlen == 0 &&
(r = choose_mac(ssh, &newkeys->mac, cprop[nmac],
sprop[nmac])) != 0)
goto out;
if ((r = choose_comp(&newkeys->comp, cprop[ncomp],
sprop[ncomp])) != 0)
goto out;
debug("kex: %s %s %s %s",
ctos ? "client->server" : "server->client",
newkeys->enc.name,
authlen == 0 ? newkeys->mac.name : "<implicit>",
newkeys->comp.name);
}
choose_kex(kex, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]);
choose_hostkeyalg(kex, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]);
if ((r = choose_kex(kex, cprop[PROPOSAL_KEX_ALGS],
sprop[PROPOSAL_KEX_ALGS])) != 0 ||
(r = choose_hostkeyalg(kex, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
sprop[PROPOSAL_SERVER_HOST_KEY_ALGS])) != 0)
goto out;
need = dh_need = 0;
for (mode = 0; mode < MODE_MAX; mode++) {
newkeys = kex->newkeys[mode];
@ -564,45 +661,47 @@ kex_choose_conf(Kex *kex)
/* ignore the next message if the proposals do not match */
if (first_kex_follows && !proposals_match(my, peer) &&
!(datafellows & SSH_BUG_FIRSTKEX)) {
type = packet_read();
debug2("skipping next packet (type %u)", type);
}
!(ssh->compat & SSH_BUG_FIRSTKEX))
ssh->dispatch_skip_packets = 1;
r = 0;
out:
kex_prop_free(my);
kex_prop_free(peer);
return r;
}
static u_char *
derive_key(Kex *kex, int id, u_int need, u_char *hash, u_int hashlen,
const u_char *shared_secret, u_int slen)
static int
derive_key(struct ssh *ssh, int id, u_int need, u_char *hash, u_int hashlen,
const struct sshbuf *shared_secret, u_char **keyp)
{
Buffer b;
struct ssh_digest_ctx *hashctx;
struct kex *kex = ssh->kex;
struct ssh_digest_ctx *hashctx = NULL;
char c = id;
u_int have;
size_t mdsz;
u_char *digest;
int r;
if ((mdsz = ssh_digest_bytes(kex->hash_alg)) == 0)
fatal("bad kex md size %zu", mdsz);
digest = xmalloc(roundup(need, mdsz));
buffer_init(&b);
buffer_append(&b, shared_secret, slen);
return SSH_ERR_INVALID_ARGUMENT;
if ((digest = calloc(1, roundup(need, mdsz))) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
/* K1 = HASH(K || H || "A" || session_id) */
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL)
fatal("%s: ssh_digest_start failed", __func__);
if (ssh_digest_update_buffer(hashctx, &b) != 0 ||
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL ||
ssh_digest_update_buffer(hashctx, shared_secret) != 0 ||
ssh_digest_update(hashctx, hash, hashlen) != 0 ||
ssh_digest_update(hashctx, &c, 1) != 0 ||
ssh_digest_update(hashctx, kex->session_id,
kex->session_id_len) != 0)
fatal("%s: ssh_digest_update failed", __func__);
if (ssh_digest_final(hashctx, digest, mdsz) != 0)
fatal("%s: ssh_digest_final failed", __func__);
kex->session_id_len) != 0 ||
ssh_digest_final(hashctx, digest, mdsz) != 0) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
ssh_digest_free(hashctx);
hashctx = NULL;
/*
* expand key:
@ -610,38 +709,49 @@ derive_key(Kex *kex, int id, u_int need, u_char *hash, u_int hashlen,
* Key = K1 || K2 || ... || Kn
*/
for (have = mdsz; need > have; have += mdsz) {
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL)
fatal("%s: ssh_digest_start failed", __func__);
if (ssh_digest_update_buffer(hashctx, &b) != 0 ||
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL ||
ssh_digest_update_buffer(hashctx, shared_secret) != 0 ||
ssh_digest_update(hashctx, hash, hashlen) != 0 ||
ssh_digest_update(hashctx, digest, have) != 0)
fatal("%s: ssh_digest_update failed", __func__);
if (ssh_digest_final(hashctx, digest + have, mdsz) != 0)
fatal("%s: ssh_digest_final failed", __func__);
ssh_digest_update(hashctx, digest, have) != 0 ||
ssh_digest_final(hashctx, digest + have, mdsz) != 0) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
ssh_digest_free(hashctx);
hashctx = NULL;
}
buffer_free(&b);
#ifdef DEBUG_KEX
fprintf(stderr, "key '%c'== ", c);
dump_digest("key", digest, need);
#endif
return digest;
*keyp = digest;
digest = NULL;
r = 0;
out:
if (digest)
free(digest);
ssh_digest_free(hashctx);
return r;
}
#define NKEYS 6
void
kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen,
const u_char *shared_secret, u_int slen)
int
kex_derive_keys(struct ssh *ssh, u_char *hash, u_int hashlen,
const struct sshbuf *shared_secret)
{
struct kex *kex = ssh->kex;
u_char *keys[NKEYS];
u_int i, mode, ctos;
u_int i, j, mode, ctos;
int r;
for (i = 0; i < NKEYS; i++) {
keys[i] = derive_key(kex, 'A'+i, kex->we_need, hash, hashlen,
shared_secret, slen);
if ((r = derive_key(ssh, 'A'+i, kex->we_need, hash, hashlen,
shared_secret, &keys[i])) != 0) {
for (j = 0; j < i; j++)
free(keys[j]);
return r;
}
}
debug2("kex_derive_keys");
for (mode = 0; mode < MODE_MAX; mode++) {
ctos = (!kex->server && mode == MODE_OUT) ||
(kex->server && mode == MODE_IN);
@ -649,54 +759,54 @@ kex_derive_keys(Kex *kex, u_char *hash, u_int hashlen,
kex->newkeys[mode]->enc.key = keys[ctos ? 2 : 3];
kex->newkeys[mode]->mac.key = keys[ctos ? 4 : 5];
}
return 0;
}
#ifdef WITH_OPENSSL
void
kex_derive_keys_bn(Kex *kex, u_char *hash, u_int hashlen, const BIGNUM *secret)
int
kex_derive_keys_bn(struct ssh *ssh, u_char *hash, u_int hashlen,
const BIGNUM *secret)
{
Buffer shared_secret;
struct sshbuf *shared_secret;
int r;
buffer_init(&shared_secret);
buffer_put_bignum2(&shared_secret, secret);
kex_derive_keys(kex, hash, hashlen,
buffer_ptr(&shared_secret), buffer_len(&shared_secret));
buffer_free(&shared_secret);
if ((shared_secret = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_bignum2(shared_secret, secret)) == 0)
r = kex_derive_keys(ssh, hash, hashlen, shared_secret);
sshbuf_free(shared_secret);
return r;
}
#endif
#ifdef WITH_SSH1
void
int
derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus,
u_int8_t cookie[8], u_int8_t id[16])
{
u_int8_t nbuf[2048], obuf[SSH_DIGEST_MAX_LENGTH];
int len;
struct ssh_digest_ctx *hashctx;
if ((hashctx = ssh_digest_start(SSH_DIGEST_MD5)) == NULL)
fatal("%s: ssh_digest_start", __func__);
struct ssh_digest_ctx *hashctx = NULL;
size_t len;
int r;
len = BN_num_bytes(host_modulus);
if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
fatal("%s: bad host modulus (len %d)", __func__, len);
BN_bn2bin(host_modulus, nbuf);
if (ssh_digest_update(hashctx, nbuf, len) != 0)
fatal("%s: ssh_digest_update failed", __func__);
len = BN_num_bytes(server_modulus);
if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
fatal("%s: bad server modulus (len %d)", __func__, len);
BN_bn2bin(server_modulus, nbuf);
if (ssh_digest_update(hashctx, nbuf, len) != 0 ||
ssh_digest_update(hashctx, cookie, 8) != 0)
fatal("%s: ssh_digest_update failed", __func__);
if (ssh_digest_final(hashctx, obuf, sizeof(obuf)) != 0)
fatal("%s: ssh_digest_final failed", __func__);
return SSH_ERR_KEY_BITS_MISMATCH;
if (BN_bn2bin(host_modulus, nbuf) <= 0 ||
(hashctx = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
ssh_digest_update(hashctx, nbuf, len) != 0 ||
ssh_digest_update(hashctx, cookie, 8) != 0 ||
ssh_digest_final(hashctx, obuf, sizeof(obuf)) != 0) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
memcpy(id, obuf, ssh_digest_bytes(SSH_DIGEST_MD5));
r = 0;
out:
ssh_digest_free(hashctx);
explicit_bzero(nbuf, sizeof(nbuf));
explicit_bzero(obuf, sizeof(obuf));
return r;
}
#endif
@ -704,16 +814,7 @@ derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus,
void
dump_digest(char *msg, u_char *digest, int len)
{
int i;
fprintf(stderr, "%s\n", msg);
for (i = 0; i < len; i++) {
fprintf(stderr, "%02x", digest[i]);
if (i%32 == 31)
fprintf(stderr, "\n");
else if (i%8 == 7)
fprintf(stderr, " ");
}
fprintf(stderr, "\n");
sshbuf_dump_data(digest, len, stderr);
}
#endif

121
kex.h
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kex.h,v 1.68 2015/01/19 20:07:45 markus Exp $ */
/* $OpenBSD: kex.h,v 1.69 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
@ -30,8 +30,8 @@
#include "buffer.h" /* XXX for typedef */
#include "key.h" /* XXX for typedef */
#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)
#include <openssl/ec.h>
#ifdef WITH_LEAKMALLOC
#include "leakmalloc.h"
#endif
#define KEX_COOKIE_LEN 16
@ -50,6 +50,8 @@
#define COMP_ZLIB 1
#define COMP_DELAYED 2
#define CURVE25519_SIZE 32
enum kex_init_proposals {
PROPOSAL_KEX_ALGS,
PROPOSAL_SERVER_HOST_KEY_ALGS,
@ -82,12 +84,6 @@ enum kex_exchange {
#define KEX_INIT_SENT 0x0001
typedef struct kex Kex;
typedef struct sshcomp Comp;
typedef struct sshmac Mac;
typedef struct sshenc Enc;
typedef struct newkeys Newkeys;
struct sshenc {
char *name;
const struct sshcipher *cipher;
@ -106,8 +102,11 @@ struct sshcomp {
struct newkeys {
struct sshenc enc;
struct sshmac mac;
struct sshcomp comp;
struct sshcomp comp;
};
struct ssh;
struct kex {
u_char *session_id;
size_t session_id_len;
@ -117,73 +116,87 @@ struct kex {
int server;
char *name;
int hostkey_type;
int kex_type;
u_int kex_type;
int roaming;
struct sshbuf *my;
struct sshbuf *peer;
sig_atomic_t done;
int flags;
u_int flags;
int hash_alg;
int ec_nid;
char *client_version_string;
char *server_version_string;
int (*verify_host_key)(Key *);
Key *(*load_host_public_key)(int);
Key *(*load_host_private_key)(int);
int (*host_key_index)(Key *);
void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int);
void (*kex[KEX_MAX])(Kex *);
int (*verify_host_key)(struct sshkey *, struct ssh *);
struct sshkey *(*load_host_public_key)(int, struct ssh *);
struct sshkey *(*load_host_private_key)(int, struct ssh *);
int (*host_key_index)(struct sshkey *, struct ssh *);
int (*sign)(struct sshkey *, struct sshkey *,
u_char **, size_t *, u_char *, size_t, u_int);
int (*kex[KEX_MAX])(struct ssh *);
/* kex specific state */
DH *dh; /* DH */
u_int min, max, nbits; /* GEX */
EC_KEY *ec_client_key; /* ECDH */
const EC_GROUP *ec_group; /* ECDH */
u_char c25519_client_key[CURVE25519_SIZE]; /* 25519 */
u_char c25519_client_pubkey[CURVE25519_SIZE]; /* 25519 */
};
int kex_names_valid(const char *);
char *kex_alg_list(char);
Kex *kex_setup(char *[PROPOSAL_MAX]);
void kex_finish(Kex *);
void kex_free_newkeys(struct newkeys *);
int kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
void kex_free_newkeys(struct newkeys *);
void kex_free(struct kex *);
void kex_send_kexinit(Kex *);
int kex_buf2prop(struct sshbuf *, int *, char ***);
int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
void kex_prop_free(char **);
int kex_send_kexinit(struct ssh *);
int kex_input_kexinit(int, u_int32_t, void *);
void kex_derive_keys(Kex *, u_char *, u_int, const u_char *, u_int);
void kex_derive_keys_bn(Kex *, u_char *, u_int, const BIGNUM *);
int kex_derive_keys(struct ssh *, u_char *, u_int, const struct sshbuf *);
int kex_derive_keys_bn(struct ssh *, u_char *, u_int, const BIGNUM *);
int kex_send_newkeys(struct ssh *);
void kexdh_client(Kex *);
void kexdh_server(Kex *);
void kexgex_client(Kex *);
void kexgex_server(Kex *);
void kexecdh_client(Kex *);
void kexecdh_server(Kex *);
void kexc25519_client(Kex *);
void kexc25519_server(Kex *);
int kexdh_client(struct ssh *);
int kexdh_server(struct ssh *);
int kexgex_client(struct ssh *);
int kexgex_server(struct ssh *);
int kexecdh_client(struct ssh *);
int kexecdh_server(struct ssh *);
int kexc25519_client(struct ssh *);
int kexc25519_server(struct ssh *);
void
kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
void
kexgex_hash(int, char *, char *, char *, int, char *,
int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
BIGNUM *, BIGNUM *, u_char **, u_int *);
#ifdef OPENSSL_HAS_ECC
void
kex_ecdh_hash(int, const EC_GROUP *, char *, char *, char *, int,
char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
const BIGNUM *, u_char **, u_int *);
#endif
void
kex_c25519_hash(int, char *, char *, char *, int,
char *, int, u_char *, int, const u_char *, const u_char *,
const u_char *, u_int, u_char **, u_int *);
int kex_dh_hash(const char *, const char *,
const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
#define CURVE25519_SIZE 32
void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE])
int kexgex_hash(int, const char *, const char *,
const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
int, int, int,
const BIGNUM *, const BIGNUM *, const BIGNUM *,
const BIGNUM *, const BIGNUM *,
u_char *, size_t *);
int kex_ecdh_hash(int, const EC_GROUP *, const char *, const char *,
const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char *, size_t *);
int kex_c25519_hash(int, const char *, const char *, const char *, size_t,
const char *, size_t, const u_char *, size_t, const u_char *, const u_char *,
const u_char *, size_t, u_char *, size_t *);
void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
void kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
const u_char pub[CURVE25519_SIZE], Buffer *out)
int kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
void
int
derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)

94
kexc25519.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexc25519.c,v 1.7 2014/05/02 03:27:54 djm Exp $ */
/* $OpenBSD: kexc25519.c,v 1.8 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001, 2013 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -35,13 +35,14 @@
#include <openssl/bn.h>
#include <openssl/evp.h>
#include "buffer.h"
#include "sshbuf.h"
#include "ssh2.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "digest.h"
#include "ssherr.h"
extern int crypto_scalarmult_curve25519(u_char a[CURVE25519_SIZE],
const u_char b[CURVE25519_SIZE], const u_char c[CURVE25519_SIZE])
@ -58,65 +59,70 @@ kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
crypto_scalarmult_curve25519(pub, key, basepoint);
}
void
int
kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
const u_char pub[CURVE25519_SIZE], Buffer *out)
const u_char pub[CURVE25519_SIZE], struct sshbuf *out)
{
u_char shared_key[CURVE25519_SIZE];
int r;
crypto_scalarmult_curve25519(shared_key, key, pub);
#ifdef DEBUG_KEXECDH
dump_digest("shared secret", shared_key, CURVE25519_SIZE);
#endif
buffer_clear(out);
buffer_put_bignum2_from_string(out, shared_key, CURVE25519_SIZE);
sshbuf_reset(out);
r = sshbuf_put_bignum2_bytes(out, shared_key, CURVE25519_SIZE);
explicit_bzero(shared_key, CURVE25519_SIZE);
return r;
}
void
int
kex_c25519_hash(
int hash_alg,
char *client_version_string,
char *server_version_string,
char *ckexinit, int ckexinitlen,
char *skexinit, int skexinitlen,
u_char *serverhostkeyblob, int sbloblen,
const char *client_version_string,
const char *server_version_string,
const char *ckexinit, size_t ckexinitlen,
const char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
const u_char client_dh_pub[CURVE25519_SIZE],
const u_char server_dh_pub[CURVE25519_SIZE],
const u_char *shared_secret, u_int secretlen,
u_char **hash, u_int *hashlen)
const u_char *shared_secret, size_t secretlen,
u_char *hash, size_t *hashlen)
{
Buffer b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
buffer_init(&b);
buffer_put_cstring(&b, client_version_string);
buffer_put_cstring(&b, server_version_string);
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
buffer_put_int(&b, ckexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, ckexinit, ckexinitlen);
buffer_put_int(&b, skexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, skexinit, skexinitlen);
buffer_put_string(&b, serverhostkeyblob, sbloblen);
buffer_put_string(&b, client_dh_pub, CURVE25519_SIZE);
buffer_put_string(&b, server_dh_pub, CURVE25519_SIZE);
buffer_append(&b, shared_secret, secretlen);
struct sshbuf *b;
int r;
if (*hashlen < ssh_digest_bytes(hash_alg))
return SSH_ERR_INVALID_ARGUMENT;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) < 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) < 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) < 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) < 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) < 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) < 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) < 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) < 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) < 0 ||
(r = sshbuf_put_string(b, client_dh_pub, CURVE25519_SIZE)) < 0 ||
(r = sshbuf_put_string(b, server_dh_pub, CURVE25519_SIZE)) < 0 ||
(r = sshbuf_put(b, shared_secret, secretlen)) < 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEX
buffer_dump(&b);
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0)
fatal("%s: digest_buffer failed", __func__);
buffer_free(&b);
#ifdef DEBUG_KEX
dump_digest("hash", digest, ssh_digest_bytes(hash_alg));
#endif
*hash = digest;
if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEX
dump_digest("hash", hash, *hashlen);
#endif
return 0;
}

159
kexc25519c.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexc25519c.c,v 1.5 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexc25519c.c,v 1.6 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -33,97 +33,136 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "ssh2.h"
#include "sshbuf.h"
#include "digest.h"
#include "ssherr.h"
void
kexc25519_client(Kex *kex)
static int
input_kex_c25519_reply(int type, u_int32_t seq, void *ctxt);
int
kexc25519_client(struct ssh *ssh)
{
Key *server_host_key;
u_char client_key[CURVE25519_SIZE];
u_char client_pubkey[CURVE25519_SIZE];
u_char *server_pubkey = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *hash;
u_int slen, sbloblen, hashlen;
Buffer shared_secret;
kexc25519_keygen(client_key, client_pubkey);
packet_start(SSH2_MSG_KEX_ECDH_INIT);
packet_put_string(client_pubkey, sizeof(client_pubkey));
packet_send();
debug("sending SSH2_MSG_KEX_ECDH_INIT");
struct kex *kex = ssh->kex;
int r;
kexc25519_keygen(kex->c25519_client_key, kex->c25519_client_pubkey);
#ifdef DEBUG_KEXECDH
dump_digest("client private key:", client_key, sizeof(client_key));
dump_digest("client private key:", kex->c25519_client_key,
sizeof(kex->c25519_client_key));
#endif
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_INIT)) != 0 ||
(r = sshpkt_put_string(ssh, kex->c25519_client_pubkey,
sizeof(kex->c25519_client_pubkey))) != 0 ||
(r = sshpkt_send(ssh)) != 0)
return r;
debug("expecting SSH2_MSG_KEX_ECDH_REPLY");
packet_read_expect(SSH2_MSG_KEX_ECDH_REPLY);
ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_REPLY, &input_kex_c25519_reply);
return 0;
}
static int
input_kex_c25519_reply(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
struct sshkey *server_host_key = NULL;
struct sshbuf *shared_secret = NULL;
u_char *server_pubkey = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t slen, pklen, sbloblen, hashlen;
int r;
if (kex->verify_host_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
/* hostkey */
server_host_key_blob = packet_get_string(&sbloblen);
server_host_key = key_from_blob(server_host_key_blob, sbloblen);
if (server_host_key == NULL)
fatal("cannot decode server_host_key_blob");
if (server_host_key->type != kex->hostkey_type)
fatal("type mismatch for decoded server_host_key_blob");
if (kex->verify_host_key == NULL)
fatal("cannot verify server_host_key");
if (kex->verify_host_key(server_host_key) == -1)
fatal("server_host_key verification failed");
if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
&sbloblen)) != 0 ||
(r = sshkey_from_blob(server_host_key_blob, sbloblen,
&server_host_key)) != 0)
goto out;
if (server_host_key->type != kex->hostkey_type) {
r = SSH_ERR_KEY_TYPE_MISMATCH;
goto out;
}
if (kex->verify_host_key(server_host_key, ssh) == -1) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
/* Q_S, server public key */
server_pubkey = packet_get_string(&slen);
if (slen != CURVE25519_SIZE)
fatal("Incorrect size for server Curve25519 pubkey: %d", slen);
/* signed H */
if ((r = sshpkt_get_string(ssh, &server_pubkey, &pklen)) != 0 ||
(r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
if (pklen != CURVE25519_SIZE) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
#ifdef DEBUG_KEXECDH
dump_digest("server public key:", server_pubkey, CURVE25519_SIZE);
#endif
/* signed H */
signature = packet_get_string(&slen);
packet_check_eom();
buffer_init(&shared_secret);
kexc25519_shared_key(client_key, server_pubkey, &shared_secret);
if ((shared_secret = sshbuf_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = kexc25519_shared_key(kex->c25519_client_key, server_pubkey,
shared_secret)) < 0)
goto out;
/* calc and verify H */
kex_c25519_hash(
hashlen = sizeof(hash);
if ((r = kex_c25519_hash(
kex->hash_alg,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->my), buffer_len(kex->my),
buffer_ptr(kex->peer), buffer_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
server_host_key_blob, sbloblen,
client_pubkey,
kex->c25519_client_pubkey,
server_pubkey,
buffer_ptr(&shared_secret), buffer_len(&shared_secret),
&hash, &hashlen
);
free(server_host_key_blob);
free(server_pubkey);
if (key_verify(server_host_key, signature, slen, hash, hashlen) != 1)
fatal("key_verify failed for server_host_key");
key_free(server_host_key);
free(signature);
sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
hash, &hashlen)) < 0)
goto out;
if ((r = sshkey_verify(server_host_key, signature, slen, hash, hashlen,
ssh->compat)) != 0)
goto out;
/* save session id */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
kex_derive_keys(kex, hash, hashlen,
buffer_ptr(&shared_secret), buffer_len(&shared_secret));
buffer_free(&shared_secret);
kex_finish(kex);
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
explicit_bzero(kex->c25519_client_key, sizeof(kex->c25519_client_key));
free(server_host_key_blob);
free(server_pubkey);
free(signature);
sshkey_free(server_host_key);
sshbuf_free(shared_secret);
return r;
}

131
kexc25519s.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexc25519s.c,v 1.5 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexc25519s.c,v 1.6 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -30,97 +30,128 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "ssh2.h"
#include "sshbuf.h"
#include "ssherr.h"
void
kexc25519_server(Kex *kex)
static int input_kex_c25519_init(int, u_int32_t, void *);
int
kexc25519_server(struct ssh *ssh)
{
Key *server_host_private, *server_host_public;
debug("expecting SSH2_MSG_KEX_ECDH_INIT");
ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_INIT, &input_kex_c25519_init);
return 0;
}
static int
input_kex_c25519_init(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
struct sshkey *server_host_private, *server_host_public;
struct sshbuf *shared_secret = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char server_key[CURVE25519_SIZE];
u_char *client_pubkey = NULL;
u_char server_pubkey[CURVE25519_SIZE];
u_char *hash;
u_int slen, sbloblen, hashlen;
Buffer shared_secret;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t slen, pklen, sbloblen, hashlen;
int r;
/* generate private key */
kexc25519_keygen(server_key, server_pubkey);
#ifdef DEBUG_KEXECDH
dump_digest("server private key:", server_key, sizeof(server_key));
#endif
if (kex->load_host_public_key == NULL ||
kex->load_host_private_key == NULL)
fatal("Cannot load hostkey");
server_host_public = kex->load_host_public_key(kex->hostkey_type);
if (server_host_public == NULL)
fatal("Unsupported hostkey type %d", kex->hostkey_type);
server_host_private = kex->load_host_private_key(kex->hostkey_type);
debug("expecting SSH2_MSG_KEX_ECDH_INIT");
packet_read_expect(SSH2_MSG_KEX_ECDH_INIT);
client_pubkey = packet_get_string(&slen);
if (slen != CURVE25519_SIZE)
fatal("Incorrect size for server Curve25519 pubkey: %d", slen);
packet_check_eom();
kex->load_host_private_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((server_host_public = kex->load_host_public_key(kex->hostkey_type,
ssh)) == NULL ||
(server_host_private = kex->load_host_private_key(kex->hostkey_type,
ssh)) == NULL) {
r = SSH_ERR_NO_HOSTKEY_LOADED;
goto out;
}
if ((r = sshpkt_get_string(ssh, &client_pubkey, &pklen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
if (pklen != CURVE25519_SIZE) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
#ifdef DEBUG_KEXECDH
dump_digest("client public key:", client_pubkey, CURVE25519_SIZE);
#endif
buffer_init(&shared_secret);
kexc25519_shared_key(server_key, client_pubkey, &shared_secret);
if ((shared_secret = sshbuf_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = kexc25519_shared_key(server_key, client_pubkey,
shared_secret)) < 0)
goto out;
/* calc H */
key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
kex_c25519_hash(
if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
&sbloblen)) != 0)
goto out;
hashlen = sizeof(hash);
if ((r = kex_c25519_hash(
kex->hash_alg,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->peer), buffer_len(kex->peer),
buffer_ptr(kex->my), buffer_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
client_pubkey,
server_pubkey,
buffer_ptr(&shared_secret), buffer_len(&shared_secret),
&hash, &hashlen
);
sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
hash, &hashlen)) < 0)
goto out;
/* save session id := H */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
/* sign H */
kex->sign(server_host_private, server_host_public, &signature, &slen,
hash, hashlen);
/* destroy_sensitive_data(); */
if ((r = kex->sign(server_host_private, server_host_public,
&signature, &slen, hash, hashlen, ssh->compat)) < 0)
goto out;
/* send server hostkey, ECDH pubkey 'Q_S' and signed H */
packet_start(SSH2_MSG_KEX_ECDH_REPLY);
packet_put_string(server_host_key_blob, sbloblen);
packet_put_string(server_pubkey, sizeof(server_pubkey));
packet_put_string(signature, slen);
packet_send();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_REPLY)) != 0 ||
(r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
(r = sshpkt_put_string(ssh, server_pubkey, sizeof(server_pubkey))) != 0 ||
(r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
free(signature);
if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
explicit_bzero(server_key, sizeof(server_key));
free(server_host_key_blob);
/* have keys, free server key */
free(signature);
free(client_pubkey);
kex_derive_keys(kex, hash, hashlen,
buffer_ptr(&shared_secret), buffer_len(&shared_secret));
buffer_free(&shared_secret);
kex_finish(kex);
sshbuf_free(shared_secret);
return r;
}

89
kexdh.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexdh.c,v 1.24 2014/01/09 23:20:00 djm Exp $ */
/* $OpenBSD: kexdh.c,v 1.25 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
*
@ -33,58 +33,61 @@
#include <openssl/evp.h>
#include "buffer.h"
#include "ssh2.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
#include "log.h"
void
int
kex_dh_hash(
char *client_version_string,
char *server_version_string,
char *ckexinit, int ckexinitlen,
char *skexinit, int skexinitlen,
u_char *serverhostkeyblob, int sbloblen,
BIGNUM *client_dh_pub,
BIGNUM *server_dh_pub,
BIGNUM *shared_secret,
u_char **hash, u_int *hashlen)
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
const BIGNUM *client_dh_pub,
const BIGNUM *server_dh_pub,
const BIGNUM *shared_secret,
u_char *hash, size_t *hashlen)
{
Buffer b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
buffer_init(&b);
buffer_put_cstring(&b, client_version_string);
buffer_put_cstring(&b, server_version_string);
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
buffer_put_int(&b, ckexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, ckexinit, ckexinitlen);
buffer_put_int(&b, skexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, skexinit, skexinitlen);
buffer_put_string(&b, serverhostkeyblob, sbloblen);
buffer_put_bignum2(&b, client_dh_pub);
buffer_put_bignum2(&b, server_dh_pub);
buffer_put_bignum2(&b, shared_secret);
struct sshbuf *b;
int r;
if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
return SSH_ERR_INVALID_ARGUMENT;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEX
buffer_dump(&b);
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, digest, sizeof(digest)) != 0)
fatal("%s: ssh_digest_buffer failed", __func__);
buffer_free(&b);
#ifdef DEBUG_KEX
dump_digest("hash", digest, ssh_digest_bytes(SSH_DIGEST_SHA1));
#endif
*hash = digest;
if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, *hashlen) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
#ifdef DEBUG_KEX
dump_digest("hash", hash, *hashlen);
#endif
return 0;
}
#endif /* WITH_OPENSSL */

194
kexdhc.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexdhc.c,v 1.16 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexdhc.c,v 1.17 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
*
@ -36,129 +36,175 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
#include "ssh2.h"
#include "dispatch.h"
#include "compat.h"
#include "ssherr.h"
#include "sshbuf.h"
void
kexdh_client(Kex *kex)
static int input_kex_dh(int, u_int32_t, void *);
int
kexdh_client(struct ssh *ssh)
{
BIGNUM *dh_server_pub = NULL, *shared_secret = NULL;
DH *dh;
Key *server_host_key;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *kbuf, *hash;
u_int klen, slen, sbloblen, hashlen;
int kout;
struct kex *kex = ssh->kex;
int r;
/* generate and send 'e', client DH public key */
switch (kex->kex_type) {
case KEX_DH_GRP1_SHA1:
dh = dh_new_group1();
kex->dh = dh_new_group1();
break;
case KEX_DH_GRP14_SHA1:
dh = dh_new_group14();
kex->dh = dh_new_group14();
break;
default:
fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if (kex->dh == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
dh_gen_key(dh, kex->we_need * 8);
packet_start(SSH2_MSG_KEXDH_INIT);
packet_put_bignum2(dh->pub_key);
packet_send();
debug("sending SSH2_MSG_KEXDH_INIT");
if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0 ||
(r = sshpkt_start(ssh, SSH2_MSG_KEXDH_INIT)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->pub_key)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
DHparams_print_fp(stderr, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
debug("expecting SSH2_MSG_KEXDH_REPLY");
packet_read_expect(SSH2_MSG_KEXDH_REPLY);
ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_REPLY, &input_kex_dh);
r = 0;
out:
return r;
}
static int
input_kex_dh(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
BIGNUM *dh_server_pub = NULL, *shared_secret = NULL;
struct sshkey *server_host_key = NULL;
u_char *kbuf = NULL, *server_host_key_blob = NULL, *signature = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t klen = 0, slen, sbloblen, hashlen;
int kout, r;
if (kex->verify_host_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
/* key, cert */
server_host_key_blob = packet_get_string(&sbloblen);
server_host_key = key_from_blob(server_host_key_blob, sbloblen);
if (server_host_key == NULL)
fatal("cannot decode server_host_key_blob");
if (server_host_key->type != kex->hostkey_type)
fatal("type mismatch for decoded server_host_key_blob");
if (kex->verify_host_key == NULL)
fatal("cannot verify server_host_key");
if (kex->verify_host_key(server_host_key) == -1)
fatal("server_host_key verification failed");
if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
&sbloblen)) != 0 ||
(r = sshkey_from_blob(server_host_key_blob, sbloblen,
&server_host_key)) != 0)
goto out;
if (server_host_key->type != kex->hostkey_type) {
r = SSH_ERR_KEY_TYPE_MISMATCH;
goto out;
}
if (kex->verify_host_key(server_host_key, ssh) == -1) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
/* DH parameter f, server public DH key */
if ((dh_server_pub = BN_new()) == NULL)
fatal("dh_server_pub == NULL");
packet_get_bignum2(dh_server_pub);
if ((dh_server_pub = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
/* signed H */
if ((r = sshpkt_get_bignum2(ssh, dh_server_pub)) != 0 ||
(r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_server_pub= ");
BN_print_fp(stderr, dh_server_pub);
fprintf(stderr, "\n");
debug("bits %d", BN_num_bits(dh_server_pub));
#endif
if (!dh_pub_is_valid(kex->dh, dh_server_pub)) {
sshpkt_disconnect(ssh, "bad server public DH value");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
/* signed H */
signature = packet_get_string(&slen);
packet_check_eom();
if (!dh_pub_is_valid(dh, dh_server_pub))
packet_disconnect("bad server public DH value");
klen = DH_size(dh);
kbuf = xmalloc(klen);
if ((kout = DH_compute_key(kbuf, dh_server_pub, dh)) < 0)
fatal("DH_compute_key: failed");
klen = DH_size(kex->dh);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((kout = DH_compute_key(kbuf, dh_server_pub, kex->dh)) < 0 ||
BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXDH
dump_digest("shared secret", kbuf, kout);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("kexdh_client: BN_new failed");
if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
fatal("kexdh_client: BN_bin2bn failed");
explicit_bzero(kbuf, klen);
free(kbuf);
/* calc and verify H */
kex_dh_hash(
hashlen = sizeof(hash);
if ((r = kex_dh_hash(
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->my), buffer_len(kex->my),
buffer_ptr(kex->peer), buffer_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
server_host_key_blob, sbloblen,
dh->pub_key,
kex->dh->pub_key,
dh_server_pub,
shared_secret,
&hash, &hashlen
);
free(server_host_key_blob);
BN_clear_free(dh_server_pub);
DH_free(dh);
hash, &hashlen)) != 0)
goto out;
if (key_verify(server_host_key, signature, slen, hash, hashlen) != 1)
fatal("key_verify failed for server_host_key");
key_free(server_host_key);
free(signature);
if ((r = sshkey_verify(server_host_key, signature, slen, hash, hashlen,
ssh->compat)) != 0)
goto out;
/* save session id */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
DH_free(kex->dh);
kex->dh = NULL;
if (dh_server_pub)
BN_clear_free(dh_server_pub);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
sshkey_free(server_host_key);
free(server_host_key_blob);
free(signature);
return r;
}
#endif /* WITH_OPENSSL */

184
kexdhs.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexdhs.c,v 1.19 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexdhs.c,v 1.20 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
*
@ -35,55 +35,88 @@
#include <openssl/dh.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
#include "ssh2.h"
void
kexdh_server(Kex *kex)
#include "dispatch.h"
#include "compat.h"
#include "ssherr.h"
#include "sshbuf.h"
static int input_kex_dh_init(int, u_int32_t, void *);
int
kexdh_server(struct ssh *ssh)
{
BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
DH *dh;
Key *server_host_public, *server_host_private;
u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
u_int sbloblen, klen, hashlen, slen;
int kout;
struct kex *kex = ssh->kex;
int r;
/* generate server DH public key */
switch (kex->kex_type) {
case KEX_DH_GRP1_SHA1:
dh = dh_new_group1();
kex->dh = dh_new_group1();
break;
case KEX_DH_GRP14_SHA1:
dh = dh_new_group14();
kex->dh = dh_new_group14();
break;
default:
fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
dh_gen_key(dh, kex->we_need * 8);
if (kex->dh == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
goto out;
debug("expecting SSH2_MSG_KEXDH_INIT");
packet_read_expect(SSH2_MSG_KEXDH_INIT);
ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_INIT, &input_kex_dh_init);
r = 0;
out:
return r;
}
int
input_kex_dh_init(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
struct sshkey *server_host_public, *server_host_private;
u_char *kbuf = NULL, *signature = NULL, *server_host_key_blob = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t sbloblen, slen;
size_t klen = 0, hashlen;
int kout, r;
if (kex->load_host_public_key == NULL ||
kex->load_host_private_key == NULL)
fatal("Cannot load hostkey");
server_host_public = kex->load_host_public_key(kex->hostkey_type);
if (server_host_public == NULL)
fatal("Unsupported hostkey type %d", kex->hostkey_type);
server_host_private = kex->load_host_private_key(kex->hostkey_type);
kex->load_host_private_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((server_host_public = kex->load_host_public_key(kex->hostkey_type,
ssh)) == NULL ||
(server_host_private = kex->load_host_private_key(kex->hostkey_type,
ssh)) == NULL) {
r = SSH_ERR_NO_HOSTKEY_LOADED;
goto out;
}
/* key, cert */
if ((dh_client_pub = BN_new()) == NULL)
fatal("dh_client_pub == NULL");
packet_get_bignum2(dh_client_pub);
packet_check_eom();
if ((dh_client_pub = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshpkt_get_bignum2(ssh, dh_client_pub)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_client_pub= ");
@ -93,71 +126,90 @@ kexdh_server(Kex *kex)
#endif
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
DHparams_print_fp(stderr, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
if (!dh_pub_is_valid(dh, dh_client_pub))
packet_disconnect("bad client public DH value");
if (!dh_pub_is_valid(kex->dh, dh_client_pub)) {
sshpkt_disconnect(ssh, "bad client public DH value");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
klen = DH_size(dh);
kbuf = xmalloc(klen);
if ((kout = DH_compute_key(kbuf, dh_client_pub, dh)) < 0)
fatal("DH_compute_key: failed");
klen = DH_size(kex->dh);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((kout = DH_compute_key(kbuf, dh_client_pub, kex->dh)) < 0 ||
BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXDH
dump_digest("shared secret", kbuf, kout);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("kexdh_server: BN_new failed");
if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
fatal("kexdh_server: BN_bin2bn failed");
explicit_bzero(kbuf, klen);
free(kbuf);
key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
&sbloblen)) != 0)
goto out;
/* calc H */
kex_dh_hash(
hashlen = sizeof(hash);
if ((r = kex_dh_hash(
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->peer), buffer_len(kex->peer),
buffer_ptr(kex->my), buffer_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
dh_client_pub,
dh->pub_key,
kex->dh->pub_key,
shared_secret,
&hash, &hashlen
);
BN_clear_free(dh_client_pub);
hash, &hashlen)) != 0)
goto out;
/* save session id := H */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
/* sign H */
kex->sign(server_host_private, server_host_public, &signature, &slen,
hash, hashlen);
if ((r = kex->sign(server_host_private, server_host_public,
&signature, &slen, hash, hashlen, ssh->compat)) < 0)
goto out;
/* destroy_sensitive_data(); */
/* send server hostkey, DH pubkey 'f' and singed H */
packet_start(SSH2_MSG_KEXDH_REPLY);
packet_put_string(server_host_key_blob, sbloblen);
packet_put_bignum2(dh->pub_key); /* f */
packet_put_string(signature, slen);
packet_send();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEXDH_REPLY)) != 0 ||
(r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->pub_key)) != 0 || /* f */
(r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
free(signature);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
DH_free(kex->dh);
kex->dh = NULL;
if (dh_client_pub)
BN_clear_free(dh_client_pub);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
free(server_host_key_blob);
/* have keys, free DH */
DH_free(dh);
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
free(signature);
return r;
}
#endif /* WITH_OPENSSL */

83
kexecdh.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexecdh.c,v 1.5 2014/01/09 23:20:00 djm Exp $ */
/* $OpenBSD: kexecdh.c,v 1.6 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -38,60 +38,63 @@
#include <openssl/ec.h>
#include <openssl/ecdh.h>
#include "buffer.h"
#include "ssh2.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "sshbuf.h"
#include "digest.h"
#include "ssherr.h"
void
int
kex_ecdh_hash(
int hash_alg,
const EC_GROUP *ec_group,
char *client_version_string,
char *server_version_string,
char *ckexinit, int ckexinitlen,
char *skexinit, int skexinitlen,
u_char *serverhostkeyblob, int sbloblen,
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
const EC_POINT *client_dh_pub,
const EC_POINT *server_dh_pub,
const BIGNUM *shared_secret,
u_char **hash, u_int *hashlen)
u_char *hash, size_t *hashlen)
{
Buffer b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
buffer_init(&b);
buffer_put_cstring(&b, client_version_string);
buffer_put_cstring(&b, server_version_string);
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
buffer_put_int(&b, ckexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, ckexinit, ckexinitlen);
buffer_put_int(&b, skexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, skexinit, skexinitlen);
buffer_put_string(&b, serverhostkeyblob, sbloblen);
buffer_put_ecpoint(&b, ec_group, client_dh_pub);
buffer_put_ecpoint(&b, ec_group, server_dh_pub);
buffer_put_bignum2(&b, shared_secret);
struct sshbuf *b;
int r;
if (*hashlen < ssh_digest_bytes(hash_alg))
return SSH_ERR_INVALID_ARGUMENT;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(r = sshbuf_put_ec(b, client_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_ec(b, server_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEX
buffer_dump(&b);
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0)
fatal("%s: ssh_digest_buffer failed", __func__);
buffer_free(&b);
#ifdef DEBUG_KEX
dump_digest("hash", digest, ssh_digest_bytes(hash_alg));
#endif
*hash = digest;
if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEX
dump_digest("hash", hash, *hashlen);
#endif
return 0;
}
#endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */

207
kexecdhc.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexecdhc.c,v 1.8 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexecdhc.c,v 1.9 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -34,126 +34,193 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include <openssl/ecdh.h>
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
#include "ssh2.h"
#include "dispatch.h"
#include "compat.h"
#include "ssherr.h"
#include "sshbuf.h"
#include <openssl/ecdh.h>
static int input_kex_ecdh_reply(int, u_int32_t, void *);
void
kexecdh_client(Kex *kex)
int
kexecdh_client(struct ssh *ssh)
{
EC_KEY *client_key;
EC_POINT *server_public;
struct kex *kex = ssh->kex;
EC_KEY *client_key = NULL;
const EC_GROUP *group;
BIGNUM *shared_secret;
Key *server_host_key;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *kbuf, *hash;
u_int klen, slen, sbloblen, hashlen;
const EC_POINT *public_key;
int r;
if ((client_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL)
fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
if (EC_KEY_generate_key(client_key) != 1)
fatal("%s: EC_KEY_generate_key failed", __func__);
if ((client_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if (EC_KEY_generate_key(client_key) != 1) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
group = EC_KEY_get0_group(client_key);
public_key = EC_KEY_get0_public_key(client_key);
packet_start(SSH2_MSG_KEX_ECDH_INIT);
packet_put_ecpoint(group, EC_KEY_get0_public_key(client_key));
packet_send();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_INIT)) != 0 ||
(r = sshpkt_put_ec(ssh, public_key, group)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
debug("sending SSH2_MSG_KEX_ECDH_INIT");
#ifdef DEBUG_KEXECDH
fputs("client private key:\n", stderr);
key_dump_ec_key(client_key);
sshkey_dump_ec_key(client_key);
#endif
kex->ec_client_key = client_key;
kex->ec_group = group;
client_key = NULL; /* owned by the kex */
debug("expecting SSH2_MSG_KEX_ECDH_REPLY");
packet_read_expect(SSH2_MSG_KEX_ECDH_REPLY);
ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_REPLY, &input_kex_ecdh_reply);
r = 0;
out:
if (client_key)
EC_KEY_free(client_key);
return r;
}
static int
input_kex_ecdh_reply(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
const EC_GROUP *group;
EC_POINT *server_public = NULL;
EC_KEY *client_key;
BIGNUM *shared_secret = NULL;
struct sshkey *server_host_key = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *kbuf = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t slen, sbloblen;
size_t klen = 0, hashlen;
int r;
if (kex->verify_host_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
group = kex->ec_group;
client_key = kex->ec_client_key;
/* hostkey */
server_host_key_blob = packet_get_string(&sbloblen);
server_host_key = key_from_blob(server_host_key_blob, sbloblen);
if (server_host_key == NULL)
fatal("cannot decode server_host_key_blob");
if (server_host_key->type != kex->hostkey_type)
fatal("type mismatch for decoded server_host_key_blob");
if (kex->verify_host_key == NULL)
fatal("cannot verify server_host_key");
if (kex->verify_host_key(server_host_key) == -1)
fatal("server_host_key verification failed");
if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
&sbloblen)) != 0 ||
(r = sshkey_from_blob(server_host_key_blob, sbloblen,
&server_host_key)) != 0)
goto out;
if (server_host_key->type != kex->hostkey_type) {
r = SSH_ERR_KEY_TYPE_MISMATCH;
goto out;
}
if (kex->verify_host_key(server_host_key, ssh) == -1) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
/* Q_S, server public key */
if ((server_public = EC_POINT_new(group)) == NULL)
fatal("%s: EC_POINT_new failed", __func__);
packet_get_ecpoint(group, server_public);
if (key_ec_validate_public(group, server_public) != 0)
fatal("%s: invalid server public key", __func__);
/* signed H */
if ((server_public = EC_POINT_new(group)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshpkt_get_ec(ssh, server_public, group)) != 0 ||
(r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXECDH
fputs("server public key:\n", stderr);
key_dump_ec_point(group, server_public);
sshkey_dump_ec_point(group, server_public);
#endif
/* signed H */
signature = packet_get_string(&slen);
packet_check_eom();
if (sshkey_ec_validate_public(group, server_public) != 0) {
sshpkt_disconnect(ssh, "invalid server public key");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
klen = (EC_GROUP_get_degree(group) + 7) / 8;
kbuf = xmalloc(klen);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if (ECDH_compute_key(kbuf, klen, server_public,
client_key, NULL) != (int)klen)
fatal("%s: ECDH_compute_key failed", __func__);
client_key, NULL) != (int)klen ||
BN_bin2bn(kbuf, klen, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXECDH
dump_digest("shared secret", kbuf, klen);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("%s: BN_new failed", __func__);
if (BN_bin2bn(kbuf, klen, shared_secret) == NULL)
fatal("%s: BN_bin2bn failed", __func__);
explicit_bzero(kbuf, klen);
free(kbuf);
/* calc and verify H */
kex_ecdh_hash(
hashlen = sizeof(hash);
if ((r = kex_ecdh_hash(
kex->hash_alg,
group,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->my), buffer_len(kex->my),
buffer_ptr(kex->peer), buffer_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
server_host_key_blob, sbloblen,
EC_KEY_get0_public_key(client_key),
server_public,
shared_secret,
&hash, &hashlen
);
free(server_host_key_blob);
EC_POINT_clear_free(server_public);
EC_KEY_free(client_key);
hash, &hashlen)) != 0)
goto out;
if (key_verify(server_host_key, signature, slen, hash, hashlen) != 1)
fatal("key_verify failed for server_host_key");
key_free(server_host_key);
free(signature);
if ((r = sshkey_verify(server_host_key, signature, slen, hash,
hashlen, ssh->compat)) != 0)
goto out;
/* save session id */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
if (kex->ec_client_key) {
EC_KEY_free(kex->ec_client_key);
kex->ec_client_key = NULL;
}
if (server_public)
EC_POINT_clear_free(server_public);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
sshkey_free(server_host_key);
free(server_host_key_blob);
free(signature);
return r;
}
#endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */

192
kexecdhs.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexecdhs.c,v 1.11 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexecdhs.c,v 1.12 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -32,124 +32,176 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include <openssl/ecdh.h>
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "ssh2.h"
#include <openssl/ecdh.h>
#include "dispatch.h"
#include "compat.h"
#include "ssherr.h"
#include "sshbuf.h"
void
kexecdh_server(Kex *kex)
static int input_kex_ecdh_init(int, u_int32_t, void *);
int
kexecdh_server(struct ssh *ssh)
{
EC_POINT *client_public;
EC_KEY *server_key;
const EC_GROUP *group;
BIGNUM *shared_secret;
Key *server_host_private, *server_host_public;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *kbuf, *hash;
u_int klen, slen, sbloblen, hashlen;
debug("expecting SSH2_MSG_KEX_ECDH_INIT");
ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_INIT, &input_kex_ecdh_init);
return 0;
}
if ((server_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL)
fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
if (EC_KEY_generate_key(server_key) != 1)
fatal("%s: EC_KEY_generate_key failed", __func__);
static int
input_kex_ecdh_init(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
EC_POINT *client_public;
EC_KEY *server_key = NULL;
const EC_GROUP *group;
const EC_POINT *public_key;
BIGNUM *shared_secret = NULL;
struct sshkey *server_host_private, *server_host_public;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char *kbuf = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t slen, sbloblen;
size_t klen = 0, hashlen;
int r;
if ((server_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if (EC_KEY_generate_key(server_key) != 1) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
group = EC_KEY_get0_group(server_key);
#ifdef DEBUG_KEXECDH
fputs("server private key:\n", stderr);
key_dump_ec_key(server_key);
sshkey_dump_ec_key(server_key);
#endif
if (kex->load_host_public_key == NULL ||
kex->load_host_private_key == NULL)
fatal("Cannot load hostkey");
server_host_public = kex->load_host_public_key(kex->hostkey_type);
if (server_host_public == NULL)
fatal("Unsupported hostkey type %d", kex->hostkey_type);
server_host_private = kex->load_host_private_key(kex->hostkey_type);
debug("expecting SSH2_MSG_KEX_ECDH_INIT");
packet_read_expect(SSH2_MSG_KEX_ECDH_INIT);
if ((client_public = EC_POINT_new(group)) == NULL)
fatal("%s: EC_POINT_new failed", __func__);
packet_get_ecpoint(group, client_public);
packet_check_eom();
if (key_ec_validate_public(group, client_public) != 0)
fatal("%s: invalid client public key", __func__);
kex->load_host_private_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((server_host_public = kex->load_host_public_key(kex->hostkey_type,
ssh)) == NULL ||
(server_host_private = kex->load_host_private_key(kex->hostkey_type,
ssh)) == NULL) {
r = SSH_ERR_NO_HOSTKEY_LOADED;
goto out;
}
if ((client_public = EC_POINT_new(group)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshpkt_get_ec(ssh, client_public, group)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXECDH
fputs("client public key:\n", stderr);
key_dump_ec_point(group, client_public);
sshkey_dump_ec_point(group, client_public);
#endif
if (sshkey_ec_validate_public(group, client_public) != 0) {
sshpkt_disconnect(ssh, "invalid client public key");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
/* Calculate shared_secret */
klen = (EC_GROUP_get_degree(group) + 7) / 8;
kbuf = xmalloc(klen);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if (ECDH_compute_key(kbuf, klen, client_public,
server_key, NULL) != (int)klen)
fatal("%s: ECDH_compute_key failed", __func__);
server_key, NULL) != (int)klen ||
BN_bin2bn(kbuf, klen, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXDH
#ifdef DEBUG_KEXECDH
dump_digest("shared secret", kbuf, klen);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("%s: BN_new failed", __func__);
if (BN_bin2bn(kbuf, klen, shared_secret) == NULL)
fatal("%s: BN_bin2bn failed", __func__);
explicit_bzero(kbuf, klen);
free(kbuf);
/* calc H */
key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
kex_ecdh_hash(
if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
&sbloblen)) != 0)
goto out;
hashlen = sizeof(hash);
if ((r = kex_ecdh_hash(
kex->hash_alg,
group,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->peer), buffer_len(kex->peer),
buffer_ptr(kex->my), buffer_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
client_public,
EC_KEY_get0_public_key(server_key),
shared_secret,
&hash, &hashlen
);
EC_POINT_clear_free(client_public);
hash, &hashlen)) != 0)
goto out;
/* save session id := H */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
/* sign H */
kex->sign(server_host_private, server_host_public, &signature, &slen,
hash, hashlen);
if ((r = kex->sign(server_host_private, server_host_public,
&signature, &slen, hash, hashlen, ssh->compat)) < 0)
goto out;
/* destroy_sensitive_data(); */
public_key = EC_KEY_get0_public_key(server_key);
/* send server hostkey, ECDH pubkey 'Q_S' and signed H */
packet_start(SSH2_MSG_KEX_ECDH_REPLY);
packet_put_string(server_host_key_blob, sbloblen);
packet_put_ecpoint(group, EC_KEY_get0_public_key(server_key));
packet_put_string(signature, slen);
packet_send();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_REPLY)) != 0 ||
(r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
(r = sshpkt_put_ec(ssh, public_key, group)) != 0 ||
(r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
free(signature);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
if (kex->ec_client_key) {
EC_KEY_free(kex->ec_client_key);
kex->ec_client_key = NULL;
}
if (server_key)
EC_KEY_free(server_key);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
free(server_host_key_blob);
/* have keys, free server key */
EC_KEY_free(server_key);
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
free(signature);
return r;
}
#endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */

105
kexgex.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexgex.c,v 1.28 2014/01/09 23:20:00 djm Exp $ */
/* $OpenBSD: kexgex.c,v 1.29 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
* Copyright (c) 2001 Markus Friedl. All rights reserved.
@ -33,69 +33,70 @@
#include <openssl/evp.h>
#include <signal.h>
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "ssh2.h"
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
#include "log.h"
void
int
kexgex_hash(
int hash_alg,
char *client_version_string,
char *server_version_string,
char *ckexinit, int ckexinitlen,
char *skexinit, int skexinitlen,
u_char *serverhostkeyblob, int sbloblen,
int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
BIGNUM *client_dh_pub,
BIGNUM *server_dh_pub,
BIGNUM *shared_secret,
u_char **hash, u_int *hashlen)
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
int min, int wantbits, int max,
const BIGNUM *prime,
const BIGNUM *gen,
const BIGNUM *client_dh_pub,
const BIGNUM *server_dh_pub,
const BIGNUM *shared_secret,
u_char *hash, size_t *hashlen)
{
Buffer b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
struct sshbuf *b;
int r;
buffer_init(&b);
buffer_put_cstring(&b, client_version_string);
buffer_put_cstring(&b, server_version_string);
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
buffer_put_int(&b, ckexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, ckexinit, ckexinitlen);
buffer_put_int(&b, skexinitlen+1);
buffer_put_char(&b, SSH2_MSG_KEXINIT);
buffer_append(&b, skexinit, skexinitlen);
buffer_put_string(&b, serverhostkeyblob, sbloblen);
if (min == -1 || max == -1)
buffer_put_int(&b, wantbits);
else {
buffer_put_int(&b, min);
buffer_put_int(&b, wantbits);
buffer_put_int(&b, max);
if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
return SSH_ERR_INVALID_ARGUMENT;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(min != -1 && (r = sshbuf_put_u32(b, min)) != 0) ||
(r = sshbuf_put_u32(b, wantbits)) != 0 ||
(max != -1 && (r = sshbuf_put_u32(b, max)) != 0) ||
(r = sshbuf_put_bignum2(b, prime)) != 0 ||
(r = sshbuf_put_bignum2(b, gen)) != 0 ||
(r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
buffer_put_bignum2(&b, prime);
buffer_put_bignum2(&b, gen);
buffer_put_bignum2(&b, client_dh_pub);
buffer_put_bignum2(&b, server_dh_pub);
buffer_put_bignum2(&b, shared_secret);
#ifdef DEBUG_KEXDH
buffer_dump(&b);
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0)
fatal("%s: ssh_digest_buffer failed", __func__);
buffer_free(&b);
#ifdef DEBUG_KEX
dump_digest("hash", digest, ssh_digest_bytes(hash_alg));
#endif
*hash = digest;
if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEXDH
dump_digest("hash", hash, *hashlen);
#endif
return 0;
}
#endif /* WITH_OPENSSL */

287
kexgexc.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexgexc.c,v 1.18 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexgexc.c,v 1.19 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
* Copyright (c) 2001 Markus Friedl. All rights reserved.
@ -37,174 +37,237 @@
#include <string.h>
#include <signal.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
#include "ssh2.h"
#include "compat.h"
#include "dispatch.h"
#include "ssherr.h"
#include "sshbuf.h"
void
kexgex_client(Kex *kex)
static int input_kex_dh_gex_group(int, u_int32_t, void *);
static int input_kex_dh_gex_reply(int, u_int32_t, void *);
int
kexgex_client(struct ssh *ssh)
{
BIGNUM *dh_server_pub = NULL, *shared_secret = NULL;
BIGNUM *p = NULL, *g = NULL;
Key *server_host_key;
u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
u_int klen, slen, sbloblen, hashlen;
int kout;
int min, max, nbits;
DH *dh;
struct kex *kex = ssh->kex;
int r;
u_int nbits;
nbits = dh_estimate(kex->dh_need * 8);
if (datafellows & SSH_OLD_DHGEX) {
kex->min = DH_GRP_MIN;
kex->max = DH_GRP_MAX;
kex->nbits = nbits;
if (ssh->compat & SSH_OLD_DHGEX) {
/* Old GEX request */
packet_start(SSH2_MSG_KEX_DH_GEX_REQUEST_OLD);
packet_put_int(nbits);
min = DH_GRP_MIN;
max = DH_GRP_MAX;
debug("SSH2_MSG_KEX_DH_GEX_REQUEST_OLD(%u) sent", nbits);
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_REQUEST_OLD))
!= 0 ||
(r = sshpkt_put_u32(ssh, kex->nbits)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
debug("SSH2_MSG_KEX_DH_GEX_REQUEST_OLD(%u) sent", kex->nbits);
} else {
/* New GEX request */
min = DH_GRP_MIN;
max = DH_GRP_MAX;
packet_start(SSH2_MSG_KEX_DH_GEX_REQUEST);
packet_put_int(min);
packet_put_int(nbits);
packet_put_int(max);
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_REQUEST)) != 0 ||
(r = sshpkt_put_u32(ssh, kex->min)) != 0 ||
(r = sshpkt_put_u32(ssh, kex->nbits)) != 0 ||
(r = sshpkt_put_u32(ssh, kex->max)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
debug("SSH2_MSG_KEX_DH_GEX_REQUEST(%u<%u<%u) sent",
min, nbits, max);
kex->min, kex->nbits, kex->max);
}
#ifdef DEBUG_KEXDH
fprintf(stderr, "\nmin = %d, nbits = %d, max = %d\n",
min, nbits, max);
kex->min, kex->nbits, kex->max);
#endif
packet_send();
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_GROUP,
&input_kex_dh_gex_group);
r = 0;
out:
return r;
}
debug("expecting SSH2_MSG_KEX_DH_GEX_GROUP");
packet_read_expect(SSH2_MSG_KEX_DH_GEX_GROUP);
static int
input_kex_dh_gex_group(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
BIGNUM *p = NULL, *g = NULL;
int r, bits;
if ((p = BN_new()) == NULL)
fatal("BN_new");
packet_get_bignum2(p);
if ((g = BN_new()) == NULL)
fatal("BN_new");
packet_get_bignum2(g);
packet_check_eom();
debug("got SSH2_MSG_KEX_DH_GEX_GROUP");
if (BN_num_bits(p) < min || BN_num_bits(p) > max)
fatal("DH_GEX group out of range: %d !< %d !< %d",
min, BN_num_bits(p), max);
dh = dh_new_group(g, p);
dh_gen_key(dh, kex->we_need * 8);
if ((p = BN_new()) == NULL ||
(g = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshpkt_get_bignum2(ssh, p)) != 0 ||
(r = sshpkt_get_bignum2(ssh, g)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
if ((bits = BN_num_bits(p)) < 0 ||
(u_int)bits < kex->min || (u_int)bits > kex->max) {
r = SSH_ERR_DH_GEX_OUT_OF_RANGE;
goto out;
}
if ((kex->dh = dh_new_group(g, p)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
p = g = NULL; /* belong to kex->dh now */
/* generate and send 'e', client DH public key */
if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0 ||
(r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_INIT)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->pub_key)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
debug("SSH2_MSG_KEX_DH_GEX_INIT sent");
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
DHparams_print_fp(stderr, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_GROUP, NULL);
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_REPLY, &input_kex_dh_gex_reply);
r = 0;
out:
if (p)
BN_clear_free(p);
if (g)
BN_clear_free(g);
return r;
}
debug("SSH2_MSG_KEX_DH_GEX_INIT sent");
/* generate and send 'e', client DH public key */
packet_start(SSH2_MSG_KEX_DH_GEX_INIT);
packet_put_bignum2(dh->pub_key);
packet_send();
debug("expecting SSH2_MSG_KEX_DH_GEX_REPLY");
packet_read_expect(SSH2_MSG_KEX_DH_GEX_REPLY);
static int
input_kex_dh_gex_reply(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
BIGNUM *dh_server_pub = NULL, *shared_secret = NULL;
struct sshkey *server_host_key = NULL;
u_char *kbuf = NULL, *signature = NULL, *server_host_key_blob = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t klen = 0, slen, sbloblen, hashlen;
int kout, r;
debug("got SSH2_MSG_KEX_DH_GEX_REPLY");
if (kex->verify_host_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
/* key, cert */
server_host_key_blob = packet_get_string(&sbloblen);
server_host_key = key_from_blob(server_host_key_blob, sbloblen);
if (server_host_key == NULL)
fatal("cannot decode server_host_key_blob");
if (server_host_key->type != kex->hostkey_type)
fatal("type mismatch for decoded server_host_key_blob");
if (kex->verify_host_key == NULL)
fatal("cannot verify server_host_key");
if (kex->verify_host_key(server_host_key) == -1)
fatal("server_host_key verification failed");
if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
&sbloblen)) != 0 ||
(r = sshkey_from_blob(server_host_key_blob, sbloblen,
&server_host_key)) != 0)
goto out;
if (server_host_key->type != kex->hostkey_type) {
r = SSH_ERR_KEY_TYPE_MISMATCH;
goto out;
}
if (kex->verify_host_key(server_host_key, ssh) == -1) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
/* DH parameter f, server public DH key */
if ((dh_server_pub = BN_new()) == NULL)
fatal("dh_server_pub == NULL");
packet_get_bignum2(dh_server_pub);
if ((dh_server_pub = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
/* signed H */
if ((r = sshpkt_get_bignum2(ssh, dh_server_pub)) != 0 ||
(r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_server_pub= ");
BN_print_fp(stderr, dh_server_pub);
fprintf(stderr, "\n");
debug("bits %d", BN_num_bits(dh_server_pub));
#endif
if (!dh_pub_is_valid(kex->dh, dh_server_pub)) {
sshpkt_disconnect(ssh, "bad server public DH value");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
/* signed H */
signature = packet_get_string(&slen);
packet_check_eom();
if (!dh_pub_is_valid(dh, dh_server_pub))
packet_disconnect("bad server public DH value");
klen = DH_size(dh);
kbuf = xmalloc(klen);
if ((kout = DH_compute_key(kbuf, dh_server_pub, dh)) < 0)
fatal("DH_compute_key: failed");
klen = DH_size(kex->dh);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((kout = DH_compute_key(kbuf, dh_server_pub, kex->dh)) < 0 ||
BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXDH
dump_digest("shared secret", kbuf, kout);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("kexgex_client: BN_new failed");
if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
fatal("kexgex_client: BN_bin2bn failed");
explicit_bzero(kbuf, klen);
free(kbuf);
if (datafellows & SSH_OLD_DHGEX)
min = max = -1;
if (ssh->compat & SSH_OLD_DHGEX)
kex->min = kex->max = -1;
/* calc and verify H */
kexgex_hash(
hashlen = sizeof(hash);
if ((r = kexgex_hash(
kex->hash_alg,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->my), buffer_len(kex->my),
buffer_ptr(kex->peer), buffer_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
server_host_key_blob, sbloblen,
min, nbits, max,
dh->p, dh->g,
dh->pub_key,
kex->min, kex->nbits, kex->max,
kex->dh->p, kex->dh->g,
kex->dh->pub_key,
dh_server_pub,
shared_secret,
&hash, &hashlen
);
hash, &hashlen)) != 0)
goto out;
/* have keys, free DH */
DH_free(dh);
free(server_host_key_blob);
BN_clear_free(dh_server_pub);
if (key_verify(server_host_key, signature, slen, hash, hashlen) != 1)
fatal("key_verify failed for server_host_key");
key_free(server_host_key);
free(signature);
if ((r = sshkey_verify(server_host_key, signature, slen, hash,
hashlen, ssh->compat)) != 0)
goto out;
/* save session id */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
explicit_bzero(hash, sizeof(hash));
DH_free(kex->dh);
kex->dh = NULL;
if (dh_server_pub)
BN_clear_free(dh_server_pub);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
sshkey_free(server_host_key);
free(server_host_key_blob);
free(signature);
return r;
}
#endif /* WITH_OPENSSL */

255
kexgexs.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: kexgexs.c,v 1.20 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: kexgexs.c,v 1.21 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
* Copyright (c) 2001 Markus Friedl. All rights reserved.
@ -37,10 +37,9 @@
#include <openssl/dh.h>
#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "sshkey.h"
#include "cipher.h"
#include "digest.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
@ -51,33 +50,43 @@
#include "ssh-gss.h"
#endif
#include "monitor_wrap.h"
#include "dispatch.h"
#include "ssherr.h"
#include "sshbuf.h"
void
kexgex_server(Kex *kex)
static int input_kex_dh_gex_request(int, u_int32_t, void *);
static int input_kex_dh_gex_init(int, u_int32_t, void *);
int
kexgex_server(struct ssh *ssh)
{
BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
Key *server_host_public, *server_host_private;
DH *dh;
u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
u_int sbloblen, klen, slen, hashlen;
int omin = -1, min = -1, omax = -1, max = -1, onbits = -1, nbits = -1;
int type, kout;
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_REQUEST_OLD,
&input_kex_dh_gex_request);
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_REQUEST,
&input_kex_dh_gex_request);
debug("expecting SSH2_MSG_KEX_DH_GEX_REQUEST");
return 0;
}
if (kex->load_host_public_key == NULL ||
kex->load_host_private_key == NULL)
fatal("Cannot load hostkey");
server_host_public = kex->load_host_public_key(kex->hostkey_type);
if (server_host_public == NULL)
fatal("Unsupported hostkey type %d", kex->hostkey_type);
server_host_private = kex->load_host_private_key(kex->hostkey_type);
static int
input_kex_dh_gex_request(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
int r;
u_int min = 0, max = 0, nbits = 0;
type = packet_read();
switch (type) {
case SSH2_MSG_KEX_DH_GEX_REQUEST:
debug("SSH2_MSG_KEX_DH_GEX_REQUEST received");
omin = min = packet_get_int();
onbits = nbits = packet_get_int();
omax = max = packet_get_int();
if ((r = sshpkt_get_u32(ssh, &min)) != 0 ||
(r = sshpkt_get_u32(ssh, &nbits)) != 0 ||
(r = sshpkt_get_u32(ssh, &max)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
kex->nbits = nbits;
kex->min = min;
kex->max = max;
min = MAX(DH_GRP_MIN, min);
max = MIN(DH_GRP_MAX, max);
nbits = MAX(DH_GRP_MIN, nbits);
@ -85,45 +94,88 @@ kexgex_server(Kex *kex)
break;
case SSH2_MSG_KEX_DH_GEX_REQUEST_OLD:
debug("SSH2_MSG_KEX_DH_GEX_REQUEST_OLD received");
onbits = nbits = packet_get_int();
if ((r = sshpkt_get_u32(ssh, &nbits)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
kex->nbits = nbits;
/* unused for old GEX */
omin = min = DH_GRP_MIN;
omax = max = DH_GRP_MAX;
kex->min = min = DH_GRP_MIN;
kex->max = max = DH_GRP_MAX;
break;
default:
fatal("protocol error during kex, no DH_GEX_REQUEST: %d", type);
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
packet_check_eom();
if (omax < omin || onbits < omin || omax < onbits)
fatal("DH_GEX_REQUEST, bad parameters: %d !< %d !< %d",
omin, onbits, omax);
if (kex->max < kex->min || kex->nbits < kex->min ||
kex->max < kex->nbits) {
r = SSH_ERR_DH_GEX_OUT_OF_RANGE;
goto out;
}
/* Contact privileged parent */
dh = PRIVSEP(choose_dh(min, nbits, max));
if (dh == NULL)
packet_disconnect("Protocol error: no matching DH grp found");
kex->dh = PRIVSEP(choose_dh(min, nbits, max));
if (kex->dh == NULL) {
sshpkt_disconnect(ssh, "no matching DH grp found");
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
debug("SSH2_MSG_KEX_DH_GEX_GROUP sent");
packet_start(SSH2_MSG_KEX_DH_GEX_GROUP);
packet_put_bignum2(dh->p);
packet_put_bignum2(dh->g);
packet_send();
/* flush */
packet_write_wait();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_GROUP)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->p)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->g)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
/* Compute our exchange value in parallel with the client */
dh_gen_key(dh, kex->we_need * 8);
if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
goto out;
/* old KEX does not use min/max in kexgex_hash() */
if (type == SSH2_MSG_KEX_DH_GEX_REQUEST_OLD)
kex->min = kex->max = -1;
debug("expecting SSH2_MSG_KEX_DH_GEX_INIT");
packet_read_expect(SSH2_MSG_KEX_DH_GEX_INIT);
ssh_dispatch_set(ssh, SSH2_MSG_KEX_DH_GEX_INIT, &input_kex_dh_gex_init);
r = 0;
out:
return r;
}
static int
input_kex_dh_gex_init(int type, u_int32_t seq, void *ctxt)
{
struct ssh *ssh = ctxt;
struct kex *kex = ssh->kex;
BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
struct sshkey *server_host_public, *server_host_private;
u_char *kbuf = NULL, *signature = NULL, *server_host_key_blob = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
size_t sbloblen, slen;
size_t klen = 0, hashlen;
int kout, r;
if (kex->load_host_public_key == NULL ||
kex->load_host_private_key == NULL) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((server_host_public = kex->load_host_public_key(kex->hostkey_type,
ssh)) == NULL ||
(server_host_private = kex->load_host_private_key(kex->hostkey_type,
ssh)) == NULL) {
r = SSH_ERR_NO_HOSTKEY_LOADED;
goto out;
}
/* key, cert */
if ((dh_client_pub = BN_new()) == NULL)
fatal("dh_client_pub == NULL");
packet_get_bignum2(dh_client_pub);
packet_check_eom();
if ((dh_client_pub = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshpkt_get_bignum2(ssh, dh_client_pub)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_client_pub= ");
@ -133,79 +185,92 @@ kexgex_server(Kex *kex)
#endif
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
DHparams_print_fp(stderr, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
if (!dh_pub_is_valid(dh, dh_client_pub))
packet_disconnect("bad client public DH value");
if (!dh_pub_is_valid(kex->dh, dh_client_pub)) {
sshpkt_disconnect(ssh, "bad client public DH value");
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
klen = DH_size(dh);
kbuf = xmalloc(klen);
if ((kout = DH_compute_key(kbuf, dh_client_pub, dh)) < 0)
fatal("DH_compute_key: failed");
klen = DH_size(kex->dh);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((kout = DH_compute_key(kbuf, dh_client_pub, kex->dh)) < 0 ||
BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
r = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
#ifdef DEBUG_KEXDH
dump_digest("shared secret", kbuf, kout);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("kexgex_server: BN_new failed");
if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
fatal("kexgex_server: BN_bin2bn failed");
explicit_bzero(kbuf, klen);
free(kbuf);
key_to_blob(server_host_public, &server_host_key_blob, &sbloblen);
if (type == SSH2_MSG_KEX_DH_GEX_REQUEST_OLD)
omin = min = omax = max = -1;
if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
&sbloblen)) != 0)
goto out;
/* calc H */
kexgex_hash(
hashlen = sizeof(hash);
if ((r = kexgex_hash(
kex->hash_alg,
kex->client_version_string,
kex->server_version_string,
buffer_ptr(kex->peer), buffer_len(kex->peer),
buffer_ptr(kex->my), buffer_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
omin, onbits, omax,
dh->p, dh->g,
kex->min, kex->nbits, kex->max,
kex->dh->p, kex->dh->g,
dh_client_pub,
dh->pub_key,
kex->dh->pub_key,
shared_secret,
&hash, &hashlen
);
BN_clear_free(dh_client_pub);
hash, &hashlen)) != 0)
goto out;
/* save session id := H */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
kex->session_id = xmalloc(kex->session_id_len);
kex->session_id = malloc(kex->session_id_len);
if (kex->session_id == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
memcpy(kex->session_id, hash, kex->session_id_len);
}
/* sign H */
kex->sign(server_host_private, server_host_public, &signature, &slen,
hash, hashlen);
if ((r = kex->sign(server_host_private, server_host_public,
&signature, &slen, hash, hashlen, ssh->compat)) < 0)
goto out;
/* destroy_sensitive_data(); */
/* send server hostkey, DH pubkey 'f' and singed H */
debug("SSH2_MSG_KEX_DH_GEX_REPLY sent");
packet_start(SSH2_MSG_KEX_DH_GEX_REPLY);
packet_put_string(server_host_key_blob, sbloblen);
packet_put_bignum2(dh->pub_key); /* f */
packet_put_string(signature, slen);
packet_send();
if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_REPLY)) != 0 ||
(r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 ||
(r = sshpkt_put_bignum2(ssh, kex->dh->pub_key)) != 0 || /* f */
(r = sshpkt_put_string(ssh, signature, slen)) != 0 ||
(r = sshpkt_send(ssh)) != 0)
goto out;
free(signature);
if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
r = kex_send_newkeys(ssh);
out:
DH_free(kex->dh);
kex->dh = NULL;
if (dh_client_pub)
BN_clear_free(dh_client_pub);
if (kbuf) {
explicit_bzero(kbuf, klen);
free(kbuf);
}
if (shared_secret)
BN_clear_free(shared_secret);
free(server_host_key_blob);
/* have keys, free DH */
DH_free(dh);
kex_derive_keys_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
free(signature);
return r;
}
#endif /* WITH_OPENSSL */

4
monitor.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: monitor.c,v 1.139 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: monitor.c,v 1.140 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* Copyright 2002 Markus Friedl <markus@openbsd.org>
@ -717,7 +717,7 @@ mm_answer_sign(int sock, Buffer *m)
datafellows)) != 0)
fatal("%s: sshkey_sign failed: %s",
__func__, ssh_err(r));
} else if ((key = get_hostkey_public_by_index(keyid)) != NULL &&
} else if ((key = get_hostkey_public_by_index(keyid, active_state)) != NULL &&
auth_sock > 0) {
if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
p, datlen, datafellows)) != 0) {

6
monitor_wrap.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: monitor_wrap.c,v 1.82 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: monitor_wrap.c,v 1.83 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* Copyright 2002 Markus Friedl <markus@openbsd.org>
@ -221,13 +221,13 @@ mm_choose_dh(int min, int nbits, int max)
int
mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
{
Kex *kex = *pmonitor->m_pkex;
struct kex *kex = *pmonitor->m_pkex;
Buffer m;
debug3("%s entering", __func__);
buffer_init(&m);
buffer_put_int(&m, kex->host_key_index(key));
buffer_put_int(&m, kex->host_key_index(key, active_state));
buffer_put_string(&m, data, datalen);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);

6
serverloop.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: serverloop.c,v 1.174 2015/01/19 20:07:45 markus Exp $ */
/* $OpenBSD: serverloop.c,v 1.175 2015/01/19 20:16:15 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -544,7 +544,7 @@ drain_output(void)
static void
process_buffered_input_packets(void)
{
dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? active_state->kex : NULL);
dispatch_run(DISPATCH_NONBLOCK, NULL, active_state);
}
/*
@ -874,7 +874,7 @@ server_loop2(Authctxt *authctxt)
if (packet_need_rekeying()) {
debug("need rekeying");
active_state->kex->done = 0;
kex_send_kexinit(active_state->kex);
kex_send_kexinit(active_state);
}
}
process_input(readset);

14
ssh-keyscan.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keyscan.c,v 1.93 2014/12/11 08:20:09 djm Exp $ */
/* $OpenBSD: ssh-keyscan.c,v 1.94 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
*
@ -100,7 +100,7 @@ typedef struct Connection {
char *c_namelist; /* Pointer to other possible addresses */
char *c_output_name; /* Hostname of connection for output */
char *c_data; /* Data read from this fd */
Kex *c_kex; /* The key-exchange struct for ssh2 */
struct kex *c_kex; /* The key-exchange struct for ssh2 */
struct timeval c_tv; /* Time at which connection gets aborted */
TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
} con;
@ -221,7 +221,7 @@ keygrab_ssh1(con *c)
#endif
static int
hostjump(Key *hostkey)
hostjump(Key *hostkey, struct ssh *ssh)
{
kexjmp_key = hostkey;
longjmp(kexjmp, 1);
@ -247,7 +247,7 @@ static Key *
keygrab_ssh2(con *c)
{
char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
int j;
int r, j;
packet_set_connection(c->c_fd, c->c_fd);
enable_compat20();
@ -256,7 +256,9 @@ keygrab_ssh2(con *c)
(c->c_keytype == KT_RSA ? "ssh-rsa" :
(c->c_keytype == KT_ED25519 ? "ssh-ed25519" :
"ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"));
c->c_kex = kex_setup(myproposal);
if ((r = kex_setup(active_state, myproposal)) < 0)
fatal("%s: kex_setup: %s", __func__, ssh_err(r));
c->c_kex = active_state->kex;
#ifdef WITH_OPENSSL
c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
@ -269,7 +271,7 @@ keygrab_ssh2(con *c)
if (!(j = setjmp(kexjmp))) {
nonfatal_fatal = 1;
dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, active_state);
fprintf(stderr, "Impossible! dispatch_run() returned!\n");
exit(1);
}

12
sshconnect2.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: sshconnect2.c,v 1.218 2015/01/19 20:07:45 markus Exp $ */
/* $OpenBSD: sshconnect2.c,v 1.219 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2008 Damien Miller. All rights reserved.
@ -92,7 +92,7 @@ char *xxx_host;
struct sockaddr *xxx_hostaddr;
static int
verify_host_key_callback(Key *hostkey)
verify_host_key_callback(Key *hostkey, struct ssh *ssh)
{
if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
fatal("Host key verification failed.");
@ -157,7 +157,7 @@ void
ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port)
{
char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
Kex *kex;
struct kex *kex;
xxx_host = host;
xxx_hostaddr = hostaddr;
@ -204,8 +204,8 @@ ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port)
(time_t)options.rekey_interval);
/* start key exchange */
kex = kex_setup(myproposal);
active_state->kex = kex;
kex_setup(active_state, myproposal);
kex = active_state->kex;
#ifdef WITH_OPENSSL
kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
@ -218,7 +218,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port)
kex->server_version_string=server_version_string;
kex->verify_host_key=&verify_host_key_callback;
dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
dispatch_run(DISPATCH_BLOCK, &kex->done, active_state);
if (options.use_roaming && !kex->roaming) {
debug("Roaming not allowed by server");

47
sshd.c
Просмотреть файл

@ -1,4 +1,4 @@
/* $OpenBSD: sshd.c,v 1.434 2015/01/19 19:52:16 markus Exp $ */
/* $OpenBSD: sshd.c,v 1.435 2015/01/19 20:16:15 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -836,7 +836,7 @@ list_hostkey_types(void)
}
static Key *
get_hostkey_by_type(int type, int need_private)
get_hostkey_by_type(int type, int need_private, struct ssh *ssh)
{
int i;
Key *key;
@ -865,15 +865,15 @@ get_hostkey_by_type(int type, int need_private)
}
Key *
get_hostkey_public_by_type(int type)
get_hostkey_public_by_type(int type, struct ssh *ssh)
{
return get_hostkey_by_type(type, 0);
return get_hostkey_by_type(type, 0, ssh);
}
Key *
get_hostkey_private_by_type(int type)
get_hostkey_private_by_type(int type, struct ssh *ssh)
{
return get_hostkey_by_type(type, 1);
return get_hostkey_by_type(type, 1, ssh);
}
Key *
@ -885,7 +885,7 @@ get_hostkey_by_index(int ind)
}
Key *
get_hostkey_public_by_index(int ind)
get_hostkey_public_by_index(int ind, struct ssh *ssh)
{
if (ind < 0 || ind >= options.num_host_key_files)
return (NULL);
@ -893,7 +893,7 @@ get_hostkey_public_by_index(int ind)
}
int
get_hostkey_index(Key *key)
get_hostkey_index(Key *key, struct ssh *ssh)
{
int i;
@ -2432,29 +2432,30 @@ do_ssh1_kex(void)
}
#endif
void
sshd_hostkey_sign(Key *privkey, Key *pubkey, u_char **signature, u_int *slen,
u_char *data, u_int dlen)
int
sshd_hostkey_sign(Key *privkey, Key *pubkey, u_char **signature, size_t *slen,
u_char *data, size_t dlen, u_int flag)
{
int r;
u_int xxx_slen, xxx_dlen = dlen;
if (privkey) {
if (PRIVSEP(key_sign(privkey, signature, slen, data, dlen) < 0))
if (PRIVSEP(key_sign(privkey, signature, &xxx_slen, data, xxx_dlen) < 0))
fatal("%s: key_sign failed", __func__);
if (slen)
*slen = xxx_slen;
} else if (use_privsep) {
if (mm_key_sign(pubkey, signature, slen, data, dlen) < 0)
if (mm_key_sign(pubkey, signature, &xxx_slen, data, xxx_dlen) < 0)
fatal("%s: pubkey_sign failed", __func__);
if (slen)
*slen = xxx_slen;
} else {
size_t xxx_slen;
if ((r = ssh_agent_sign(auth_sock, pubkey, signature, &xxx_slen,
if ((r = ssh_agent_sign(auth_sock, pubkey, signature, slen,
data, dlen, datafellows)) != 0)
fatal("%s: ssh_agent_sign failed: %s",
__func__, ssh_err(r));
/* XXX: Old API is u_int; new size_t */
if (slen != NULL)
*slen = xxx_slen;
}
return 0;
}
/*
@ -2464,7 +2465,7 @@ static void
do_ssh2_kex(void)
{
char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
Kex *kex;
struct kex *kex;
if (options.ciphers != NULL) {
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
@ -2500,8 +2501,8 @@ do_ssh2_kex(void)
list_hostkey_types());
/* start key exchange */
kex = kex_setup(myproposal);
active_state->kex = kex;
kex_setup(active_state, myproposal);
kex = active_state->kex;
#ifdef WITH_OPENSSL
kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
@ -2518,7 +2519,7 @@ do_ssh2_kex(void)
kex->host_key_index=&get_hostkey_index;
kex->sign = sshd_hostkey_sign;
dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
dispatch_run(DISPATCH_BLOCK, &kex->done, active_state);
session_id2 = kex->session_id;
session_id2_len = kex->session_id_len;