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-rw-r--r--usr.bin/ssh/kex.h22
-rw-r--r--usr.bin/ssh/kexc25519.c38
-rw-r--r--usr.bin/ssh/kexdh.c16
-rw-r--r--usr.bin/ssh/kexecdh.c18
-rw-r--r--usr.bin/ssh/kexkemc.c24
-rw-r--r--usr.bin/ssh/kexkems.c24
-rw-r--r--usr.bin/ssh/kexsntrup4591761x25519.c34
-rw-r--r--usr.bin/ssh/packet.c8
-rw-r--r--usr.bin/ssh/packet.h3
9 files changed, 98 insertions, 89 deletions
diff --git a/usr.bin/ssh/kex.h b/usr.bin/ssh/kex.h
index 60146ac9a98..e85d7bd9693 100644
--- a/usr.bin/ssh/kex.h
+++ b/usr.bin/ssh/kex.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: kex.h,v 1.103 2019/01/21 10:33:49 djm Exp $ */
+/* $OpenBSD: kex.h,v 1.104 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
@@ -195,24 +195,24 @@ int kex_kem_client(struct ssh *);
int kex_kem_server(struct ssh *);
int kex_dh_keypair(struct kex *);
-int kex_dh_enc(struct kex *, const u_char *, size_t, struct sshbuf **,
+int kex_dh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
struct sshbuf **);
-int kex_dh_dec(struct kex *, const u_char *, size_t, struct sshbuf **);
+int kex_dh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
int kex_ecdh_keypair(struct kex *);
-int kex_ecdh_enc(struct kex *, const u_char *, size_t, struct sshbuf **,
+int kex_ecdh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
struct sshbuf **);
-int kex_ecdh_dec(struct kex *, const u_char *, size_t, struct sshbuf **);
+int kex_ecdh_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
int kex_c25519_keypair(struct kex *);
-int kex_c25519_enc(struct kex *, const u_char *, size_t, struct sshbuf **,
+int kex_c25519_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
struct sshbuf **);
-int kex_c25519_dec(struct kex *, const u_char *, size_t, struct sshbuf **);
+int kex_c25519_dec(struct kex *, const struct sshbuf *, struct sshbuf **);
int kex_kem_sntrup4591761x25519_keypair(struct kex *);
-int kex_kem_sntrup4591761x25519_enc(struct kex *, const u_char *, size_t,
+int kex_kem_sntrup4591761x25519_enc(struct kex *, const struct sshbuf *,
struct sshbuf **, struct sshbuf **);
-int kex_kem_sntrup4591761x25519_dec(struct kex *, const u_char *, size_t,
+int kex_kem_sntrup4591761x25519_dec(struct kex *, const struct sshbuf *,
struct sshbuf **);
int kex_dh_keygen(struct kex *);
@@ -227,8 +227,8 @@ int kexgex_hash(int, const struct sshbuf *, const struct sshbuf *,
int kex_c25519_hash(int, const struct sshbuf *, const struct sshbuf *,
const u_char *, size_t, const u_char *, size_t,
- const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
- const u_char *, size_t, u_char *, size_t *);
+ const u_char *, size_t, const struct sshbuf *, const struct sshbuf *,
+ const struct sshbuf *, u_char *, size_t *);
void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
diff --git a/usr.bin/ssh/kexc25519.c b/usr.bin/ssh/kexc25519.c
index ba48ac3ad80..420c03e981d 100644
--- a/usr.bin/ssh/kexc25519.c
+++ b/usr.bin/ssh/kexc25519.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexc25519.c,v 1.14 2019/01/21 10:24:09 djm Exp $ */
+/* $OpenBSD: kexc25519.c,v 1.15 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2019 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@@ -94,9 +94,9 @@ kex_c25519_hash(
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
- const u_char *client_pub, size_t client_pub_len,
- const u_char *server_pub, size_t server_pub_len,
- const u_char *shared_secret, size_t secretlen,
+ const struct sshbuf *client_pub,
+ const struct sshbuf *server_pub,
+ const struct sshbuf *shared_secret,
u_char *hash, size_t *hashlen)
{
struct sshbuf *b;
@@ -116,9 +116,9 @@ kex_c25519_hash(
(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_pub, client_pub_len)) != 0 ||
- (r = sshbuf_put_string(b, server_pub, server_pub_len)) != 0 ||
- (r = sshbuf_put(b, shared_secret, secretlen)) != 0) {
+ (r = sshbuf_put_stringb(b, client_pub)) != 0 ||
+ (r = sshbuf_put_stringb(b, server_pub)) != 0 ||
+ (r = sshbuf_putb(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
@@ -160,11 +160,12 @@ kex_c25519_keypair(struct kex *kex)
}
int
-kex_c25519_enc(struct kex *kex, const u_char *pkblob,
- size_t pklen, struct sshbuf **server_blobp, struct sshbuf **shared_secretp)
+kex_c25519_enc(struct kex *kex, const struct sshbuf *client_blob,
+ struct sshbuf **server_blobp, struct sshbuf **shared_secretp)
{
struct sshbuf *server_blob = NULL;
struct sshbuf *buf = NULL;
+ const u_char *client_pub;
u_char *server_pub;
u_char server_key[CURVE25519_SIZE];
int r;
@@ -172,12 +173,13 @@ kex_c25519_enc(struct kex *kex, const u_char *pkblob,
*server_blobp = NULL;
*shared_secretp = NULL;
- if (pklen != CURVE25519_SIZE) {
+ if (sshbuf_len(client_blob) != CURVE25519_SIZE) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
+ client_pub = sshbuf_ptr(client_blob);
#ifdef DEBUG_KEXECDH
- dump_digest("client public key 25519:", pkblob, CURVE25519_SIZE);
+ dump_digest("client public key 25519:", client_pub, CURVE25519_SIZE);
#endif
/* allocate space for encrypted KEM key and ECDH pub key */
if ((server_blob = sshbuf_new()) == NULL) {
@@ -192,7 +194,7 @@ kex_c25519_enc(struct kex *kex, const u_char *pkblob,
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
- if ((r = kexc25519_shared_key_ext(server_key, pkblob, buf, 0)) < 0)
+ if ((r = kexc25519_shared_key_ext(server_key, client_pub, buf, 0)) < 0)
goto out;
#ifdef DEBUG_KEXECDH
dump_digest("server public key 25519:", server_pub, CURVE25519_SIZE);
@@ -210,27 +212,29 @@ kex_c25519_enc(struct kex *kex, const u_char *pkblob,
}
int
-kex_c25519_dec(struct kex *kex, const u_char *pkblob,
- size_t pklen, struct sshbuf **shared_secretp)
+kex_c25519_dec(struct kex *kex, const struct sshbuf *server_blob,
+ struct sshbuf **shared_secretp)
{
struct sshbuf *buf = NULL;
+ const u_char *server_pub;
int r;
*shared_secretp = NULL;
- if (pklen != CURVE25519_SIZE) {
+ if (sshbuf_len(server_blob) != CURVE25519_SIZE) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
+ server_pub = sshbuf_ptr(server_blob);
#ifdef DEBUG_KEXECDH
- dump_digest("server public key c25519:", pkblob, CURVE25519_SIZE);
+ dump_digest("server public key c25519:", server_pub, CURVE25519_SIZE);
#endif
/* shared secret */
if ((buf = sshbuf_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
- if ((r = kexc25519_shared_key_ext(kex->c25519_client_key, pkblob,
+ if ((r = kexc25519_shared_key_ext(kex->c25519_client_key, server_pub,
buf, 0)) < 0)
goto out;
#ifdef DEBUG_KEXECDH
diff --git a/usr.bin/ssh/kexdh.c b/usr.bin/ssh/kexdh.c
index a59dd21036f..133b743b4ed 100644
--- a/usr.bin/ssh/kexdh.c
+++ b/usr.bin/ssh/kexdh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexdh.c,v 1.30 2019/01/21 10:28:01 djm Exp $ */
+/* $OpenBSD: kexdh.c,v 1.31 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2019 Markus Friedl. All rights reserved.
*
@@ -132,7 +132,7 @@ kex_dh_keypair(struct kex *kex)
}
int
-kex_dh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
+kex_dh_enc(struct kex *kex, const struct sshbuf *client_blob,
struct sshbuf **server_blobp, struct sshbuf **shared_secretp)
{
const BIGNUM *pub_key;
@@ -152,7 +152,7 @@ kex_dh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
if ((r = sshbuf_put_bignum2(server_blob, pub_key)) != 0 ||
(r = sshbuf_get_u32(server_blob, NULL)) != 0)
goto out;
- if ((r = kex_dh_dec(kex, pkblob, pklen, shared_secretp)) != 0)
+ if ((r = kex_dh_dec(kex, client_blob, shared_secretp)) != 0)
goto out;
*server_blobp = server_blob;
server_blob = NULL;
@@ -164,7 +164,7 @@ kex_dh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
}
int
-kex_dh_dec(struct kex *kex, const u_char *pkblob, size_t pklen,
+kex_dh_dec(struct kex *kex, const struct sshbuf *dh_blob,
struct sshbuf **shared_secretp)
{
struct sshbuf *buf = NULL;
@@ -177,13 +177,9 @@ kex_dh_dec(struct kex *kex, const u_char *pkblob, size_t pklen,
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
- if ((r = sshbuf_put_u32(buf, pklen)) != 0 ||
- (r = sshbuf_put(buf, pkblob, pklen)) != 0) {
+ if ((r = sshbuf_put_stringb(buf, dh_blob)) != 0 ||
+ (r = sshbuf_get_bignum2(buf, &dh_pub)) != 0)
goto out;
- }
- if ((r = sshbuf_get_bignum2(buf, &dh_pub)) != 0) {
- goto out;
- }
sshbuf_reset(buf);
if ((r = kex_dh_compute_key(kex, dh_pub, buf)) != 0)
goto out;
diff --git a/usr.bin/ssh/kexecdh.c b/usr.bin/ssh/kexecdh.c
index 0d1818f0365..be34e541a93 100644
--- a/usr.bin/ssh/kexecdh.c
+++ b/usr.bin/ssh/kexecdh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexecdh.c,v 1.8 2019/01/21 10:29:56 djm Exp $ */
+/* $OpenBSD: kexecdh.c,v 1.9 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2010 Damien Miller. All rights reserved.
* Copyright (c) 2019 Markus Friedl. All rights reserved.
@@ -39,7 +39,7 @@
#include "ssherr.h"
static int
-kex_ecdh_dec_key_group(struct kex *, const u_char *, size_t, EC_KEY *key,
+kex_ecdh_dec_key_group(struct kex *, const struct sshbuf *, EC_KEY *key,
const EC_GROUP *, struct sshbuf **);
int
@@ -85,7 +85,7 @@ kex_ecdh_keypair(struct kex *kex)
}
int
-kex_ecdh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
+kex_ecdh_enc(struct kex *kex, const struct sshbuf *client_blob,
struct sshbuf **server_blobp, struct sshbuf **shared_secretp)
{
const EC_GROUP *group;
@@ -119,7 +119,7 @@ kex_ecdh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
if ((r = sshbuf_put_ec(server_blob, pub_key, group)) != 0 ||
(r = sshbuf_get_u32(server_blob, NULL)) != 0)
goto out;
- if ((r = kex_ecdh_dec_key_group(kex, pkblob, pklen, server_key, group,
+ if ((r = kex_ecdh_dec_key_group(kex, client_blob, server_key, group,
shared_secretp)) != 0)
goto out;
*server_blobp = server_blob;
@@ -131,7 +131,7 @@ kex_ecdh_enc(struct kex *kex, const u_char *pkblob, size_t pklen,
}
static int
-kex_ecdh_dec_key_group(struct kex *kex, const u_char *pkblob, size_t pklen,
+kex_ecdh_dec_key_group(struct kex *kex, const struct sshbuf *ec_blob,
EC_KEY *key, const EC_GROUP *group, struct sshbuf **shared_secretp)
{
struct sshbuf *buf = NULL;
@@ -147,10 +147,8 @@ kex_ecdh_dec_key_group(struct kex *kex, const u_char *pkblob, size_t pklen,
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
- if ((r = sshbuf_put_u32(buf, pklen)) != 0 ||
- (r = sshbuf_put(buf, pkblob, pklen)) != 0) {
+ if ((r = sshbuf_put_stringb(buf, ec_blob)) != 0)
goto out;
- }
if ((dh_pub = EC_POINT_new(group)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
@@ -195,12 +193,12 @@ kex_ecdh_dec_key_group(struct kex *kex, const u_char *pkblob, size_t pklen,
}
int
-kex_ecdh_dec(struct kex *kex, const u_char *pkblob, size_t pklen,
+kex_ecdh_dec(struct kex *kex, const struct sshbuf *server_blob,
struct sshbuf **shared_secretp)
{
int r;
- r = kex_ecdh_dec_key_group(kex, pkblob, pklen, kex->ec_client_key,
+ r = kex_ecdh_dec_key_group(kex, server_blob, kex->ec_client_key,
kex->ec_group, shared_secretp);
EC_KEY_free(kex->ec_client_key);
kex->ec_client_key = NULL;
diff --git a/usr.bin/ssh/kexkemc.c b/usr.bin/ssh/kexkemc.c
index 55055de273b..942be57460d 100644
--- a/usr.bin/ssh/kexkemc.c
+++ b/usr.bin/ssh/kexkemc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexkemc.c,v 1.4 2019/01/21 10:29:56 djm Exp $ */
+/* $OpenBSD: kexkemc.c,v 1.5 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2019 Markus Friedl. All rights reserved.
*
@@ -85,10 +85,10 @@ input_kex_kem_reply(int type, u_int32_t seq, struct ssh *ssh)
struct kex *kex = ssh->kex;
struct sshkey *server_host_key = NULL;
struct sshbuf *shared_secret = NULL;
- u_char *server_pubkey = NULL;
+ struct sshbuf *server_blob = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
- size_t slen, pklen, sbloblen, hashlen;
+ size_t slen, sbloblen, hashlen;
int r;
/* hostkey */
@@ -102,7 +102,7 @@ input_kex_kem_reply(int type, u_int32_t seq, struct ssh *ssh)
/* Q_S, server public key */
/* signed H */
- if ((r = sshpkt_get_string(ssh, &server_pubkey, &pklen)) != 0 ||
+ if ((r = sshpkt_getb_froms(ssh, &server_blob)) != 0 ||
(r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
@@ -114,16 +114,16 @@ input_kex_kem_reply(int type, u_int32_t seq, struct ssh *ssh)
case KEX_DH_GRP14_SHA256:
case KEX_DH_GRP16_SHA512:
case KEX_DH_GRP18_SHA512:
- r = kex_dh_dec(kex, server_pubkey, pklen, &shared_secret);
+ r = kex_dh_dec(kex, server_blob, &shared_secret);
break;
case KEX_ECDH_SHA2:
- r = kex_ecdh_dec(kex, server_pubkey, pklen, &shared_secret);
+ r = kex_ecdh_dec(kex, server_blob, &shared_secret);
break;
case KEX_C25519_SHA256:
- r = kex_c25519_dec(kex, server_pubkey, pklen, &shared_secret);
+ r = kex_c25519_dec(kex, server_blob, &shared_secret);
break;
case KEX_KEM_SNTRUP4591761X25519_SHA512:
- r = kex_kem_sntrup4591761x25519_dec(kex, server_pubkey, pklen,
+ r = kex_kem_sntrup4591761x25519_dec(kex, server_blob,
&shared_secret);
break;
default:
@@ -142,9 +142,9 @@ input_kex_kem_reply(int type, u_int32_t seq, struct ssh *ssh)
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
server_host_key_blob, sbloblen,
- sshbuf_ptr(kex->kem_client_pub), sshbuf_len(kex->kem_client_pub),
- server_pubkey, pklen,
- sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
+ kex->kem_client_pub,
+ server_blob,
+ shared_secret,
hash, &hashlen)) != 0)
goto out;
@@ -160,9 +160,9 @@ out:
explicit_bzero(kex->sntrup4591761_client_key,
sizeof(kex->sntrup4591761_client_key));
free(server_host_key_blob);
- free(server_pubkey);
free(signature);
sshkey_free(server_host_key);
+ sshbuf_free(server_blob);
sshbuf_free(shared_secret);
sshbuf_free(kex->kem_client_pub);
kex->kem_client_pub = NULL;
diff --git a/usr.bin/ssh/kexkems.c b/usr.bin/ssh/kexkems.c
index 10ef1219608..3ba8f0df552 100644
--- a/usr.bin/ssh/kexkems.c
+++ b/usr.bin/ssh/kexkems.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexkems.c,v 1.4 2019/01/21 10:29:56 djm Exp $ */
+/* $OpenBSD: kexkems.c,v 1.5 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2019 Markus Friedl. All rights reserved.
*
@@ -53,17 +53,17 @@ input_kex_kem_init(int type, u_int32_t seq, struct ssh *ssh)
struct sshkey *server_host_private, *server_host_public;
struct sshbuf *shared_secret = NULL;
struct sshbuf *server_pubkey = NULL;
+ struct sshbuf *client_pubkey = NULL;
u_char *server_host_key_blob = NULL, *signature = NULL;
- u_char *client_pubkey = NULL;
u_char hash[SSH_DIGEST_MAX_LENGTH];
- size_t slen, pklen, sbloblen, hashlen;
+ size_t slen, sbloblen, hashlen;
int r;
if ((r = kex_load_hostkey(ssh, &server_host_private,
&server_host_public)) != 0)
goto out;
- if ((r = sshpkt_get_string(ssh, &client_pubkey, &pklen)) != 0 ||
+ if ((r = sshpkt_getb_froms(ssh, &client_pubkey)) != 0 ||
(r = sshpkt_get_end(ssh)) != 0)
goto out;
@@ -74,19 +74,19 @@ input_kex_kem_init(int type, u_int32_t seq, struct ssh *ssh)
case KEX_DH_GRP14_SHA256:
case KEX_DH_GRP16_SHA512:
case KEX_DH_GRP18_SHA512:
- r = kex_dh_enc(kex, client_pubkey, pklen, &server_pubkey,
+ r = kex_dh_enc(kex, client_pubkey, &server_pubkey,
&shared_secret);
break;
case KEX_ECDH_SHA2:
- r = kex_ecdh_enc(kex, client_pubkey, pklen, &server_pubkey,
+ r = kex_ecdh_enc(kex, client_pubkey, &server_pubkey,
&shared_secret);
break;
case KEX_C25519_SHA256:
- r = kex_c25519_enc(kex, client_pubkey, pklen, &server_pubkey,
+ r = kex_c25519_enc(kex, client_pubkey, &server_pubkey,
&shared_secret);
break;
case KEX_KEM_SNTRUP4591761X25519_SHA512:
- r = kex_kem_sntrup4591761x25519_enc(kex, client_pubkey, pklen,
+ r = kex_kem_sntrup4591761x25519_enc(kex, client_pubkey,
&server_pubkey, &shared_secret);
break;
default:
@@ -108,9 +108,9 @@ input_kex_kem_init(int type, u_int32_t seq, struct ssh *ssh)
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
- client_pubkey, pklen,
- sshbuf_ptr(server_pubkey), sshbuf_len(server_pubkey),
- sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
+ client_pubkey,
+ server_pubkey,
+ shared_secret,
hash, &hashlen)) != 0)
goto out;
@@ -133,8 +133,8 @@ out:
explicit_bzero(hash, sizeof(hash));
free(server_host_key_blob);
free(signature);
- free(client_pubkey);
sshbuf_free(shared_secret);
+ sshbuf_free(client_pubkey);
sshbuf_free(server_pubkey);
return r;
}
diff --git a/usr.bin/ssh/kexsntrup4591761x25519.c b/usr.bin/ssh/kexsntrup4591761x25519.c
index ffe05f4201e..d845f3d445d 100644
--- a/usr.bin/ssh/kexsntrup4591761x25519.c
+++ b/usr.bin/ssh/kexsntrup4591761x25519.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexsntrup4591761x25519.c,v 1.1 2019/01/21 10:20:12 djm Exp $ */
+/* $OpenBSD: kexsntrup4591761x25519.c,v 1.2 2019/01/21 10:35:09 djm Exp $ */
/*
* Copyright (c) 2019 Markus Friedl. All rights reserved.
*
@@ -66,11 +66,13 @@ kex_kem_sntrup4591761x25519_keypair(struct kex *kex)
}
int
-kex_kem_sntrup4591761x25519_enc(struct kex *kex, const u_char *pkblob,
- size_t pklen, struct sshbuf **server_blobp, struct sshbuf **shared_secretp)
+kex_kem_sntrup4591761x25519_enc(struct kex *kex,
+ const struct sshbuf *client_blob, struct sshbuf **server_blobp,
+ struct sshbuf **shared_secretp)
{
struct sshbuf *server_blob = NULL;
struct sshbuf *buf = NULL;
+ const u_char *client_pub;
u_char *kem_key, *ciphertext, *server_pub;
u_char server_key[CURVE25519_SIZE];
u_char hash[SSH_DIGEST_MAX_LENGTH];
@@ -80,17 +82,19 @@ kex_kem_sntrup4591761x25519_enc(struct kex *kex, const u_char *pkblob,
*server_blobp = NULL;
*shared_secretp = NULL;
- /* pkblob contains both KEM and ECDH client pubkeys */
+ /* client_blob contains both KEM and ECDH client pubkeys */
need = crypto_kem_sntrup4591761_PUBLICKEYBYTES + CURVE25519_SIZE;
- if (pklen != need) {
+ if (sshbuf_len(client_blob) != need) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
+ client_pub = sshbuf_ptr(client_blob);
#ifdef DEBUG_KEXECDH
- dump_digest("client public key sntrup4591761:", pkblob,
+ dump_digest("client public key sntrup4591761:", client_pub,
crypto_kem_sntrup4591761_PUBLICKEYBYTES);
dump_digest("client public key 25519:",
- pkblob + crypto_kem_sntrup4591761_PUBLICKEYBYTES, CURVE25519_SIZE);
+ client_pub + crypto_kem_sntrup4591761_PUBLICKEYBYTES,
+ CURVE25519_SIZE);
#endif
/* allocate buffer for concatenation of KEM key and ECDH shared key */
/* the buffer will be hashed and the result is the shared secret */
@@ -110,13 +114,13 @@ kex_kem_sntrup4591761x25519_enc(struct kex *kex, const u_char *pkblob,
if ((r = sshbuf_reserve(server_blob, need, &ciphertext)) != 0)
goto out;
/* generate and encrypt KEM key with client key */
- crypto_kem_sntrup4591761_enc(ciphertext, kem_key, pkblob);
+ crypto_kem_sntrup4591761_enc(ciphertext, kem_key, client_pub);
/* generate ECDH key pair, store server pubkey after ciphertext */
server_pub = ciphertext + crypto_kem_sntrup4591761_CIPHERTEXTBYTES;
kexc25519_keygen(server_key, server_pub);
/* append ECDH shared key */
- if ((r = kexc25519_shared_key_ext(server_key,
- pkblob + crypto_kem_sntrup4591761_PUBLICKEYBYTES, buf, 1)) < 0)
+ client_pub += crypto_kem_sntrup4591761_PUBLICKEYBYTES;
+ if ((r = kexc25519_shared_key_ext(server_key, client_pub, buf, 1)) < 0)
goto out;
if ((r = ssh_digest_buffer(kex->hash_alg, buf, hash, sizeof(hash))) != 0)
goto out;
@@ -149,8 +153,8 @@ kex_kem_sntrup4591761x25519_enc(struct kex *kex, const u_char *pkblob,
}
int
-kex_kem_sntrup4591761x25519_dec(struct kex *kex, const u_char *pkblob,
- size_t pklen, struct sshbuf **shared_secretp)
+kex_kem_sntrup4591761x25519_dec(struct kex *kex,
+ const struct sshbuf *server_blob, struct sshbuf **shared_secretp)
{
struct sshbuf *buf = NULL;
u_char *kem_key = NULL;
@@ -162,12 +166,12 @@ kex_kem_sntrup4591761x25519_dec(struct kex *kex, const u_char *pkblob,
*shared_secretp = NULL;
need = crypto_kem_sntrup4591761_CIPHERTEXTBYTES + CURVE25519_SIZE;
- if (pklen != need) {
+ if (sshbuf_len(server_blob) != need) {
r = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
- ciphertext = pkblob;
- server_pub = pkblob + crypto_kem_sntrup4591761_CIPHERTEXTBYTES;
+ ciphertext = sshbuf_ptr(server_blob);
+ server_pub = ciphertext + crypto_kem_sntrup4591761_CIPHERTEXTBYTES;
#ifdef DEBUG_KEXECDH
dump_digest("server cipher text:", ciphertext,
crypto_kem_sntrup4591761_CIPHERTEXTBYTES);
diff --git a/usr.bin/ssh/packet.c b/usr.bin/ssh/packet.c
index 41320e4e539..e6ee7c1bd98 100644
--- a/usr.bin/ssh/packet.c
+++ b/usr.bin/ssh/packet.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.281 2019/01/21 09:54:11 djm Exp $ */
+/* $OpenBSD: packet.c,v 1.282 2019/01/21 10:35:09 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -2516,6 +2516,12 @@ sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
}
+int
+sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp)
+{
+ return sshbuf_froms(ssh->state->incoming_packet, valp);
+}
+
#ifdef WITH_OPENSSL
int
sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g)
diff --git a/usr.bin/ssh/packet.h b/usr.bin/ssh/packet.h
index 061a44bd7fb..4ff3682baec 100644
--- a/usr.bin/ssh/packet.h
+++ b/usr.bin/ssh/packet.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.h,v 1.89 2019/01/21 09:54:11 djm Exp $ */
+/* $OpenBSD: packet.h,v 1.90 2019/01/21 10:35:09 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -185,6 +185,7 @@ int sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp);
int sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp);
int sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp);
int sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp);
+int sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp);
int sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g);
int sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp);
int sshpkt_get_end(struct ssh *ssh);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 13:26:39 +0000