diff options
| -rw-r--r-- | usr.bin/ssh/kex.c | 3 | ||||
| -rw-r--r-- | usr.bin/ssh/kex.h | 19 | ||||
| -rw-r--r-- | usr.bin/ssh/kexc25519.c | 124 | ||||
| -rw-r--r-- | usr.bin/ssh/kexc25519c.c | 125 | ||||
| -rw-r--r-- | usr.bin/ssh/kexc25519s.c | 120 | ||||
| -rw-r--r-- | usr.bin/ssh/lib/Makefile | 4 | ||||
| -rw-r--r-- | usr.bin/ssh/myproposal.h | 3 | ||||
| -rw-r--r-- | usr.bin/ssh/smult_curve25519_ref.c | 264 | ||||
| -rw-r--r-- | usr.bin/ssh/ssh-keyscan.c | 3 | ||||
| -rw-r--r-- | usr.bin/ssh/sshconnect2.c | 3 | ||||
| -rw-r--r-- | usr.bin/ssh/sshd.c | 3 | ||||
| -rw-r--r-- | usr.bin/ssh/sshd/Makefile | 5 |
12 files changed, 666 insertions, 10 deletions
diff --git a/usr.bin/ssh/kex.c b/usr.bin/ssh/kex.c index bc1d6f9ba61..d356a680882 100644 --- a/usr.bin/ssh/kex.c +++ b/usr.bin/ssh/kex.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kex.c,v 1.91 2013/05/17 00:13:13 djm Exp $ */ +/* $OpenBSD: kex.c,v 1.92 2013/11/02 21:59:15 markus Exp $ */ /* * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. * @@ -65,6 +65,7 @@ static const struct kexalg kexalgs[] = { { KEX_ECDH_SHA2_NISTP256, KEX_ECDH_SHA2, NID_X9_62_prime256v1, EVP_sha256 }, { KEX_ECDH_SHA2_NISTP384, KEX_ECDH_SHA2, NID_secp384r1, EVP_sha384 }, { KEX_ECDH_SHA2_NISTP521, KEX_ECDH_SHA2, NID_secp521r1, EVP_sha512 }, + { KEX_CURVE25519_SHA256, KEX_C25519_SHA256, 0, EVP_sha256 }, { NULL, -1, -1, NULL}, }; diff --git a/usr.bin/ssh/kex.h b/usr.bin/ssh/kex.h index 6d8252c1290..bab9c8d7324 100644 --- a/usr.bin/ssh/kex.h +++ b/usr.bin/ssh/kex.h @@ -1,4 +1,4 @@ -/* $OpenBSD: kex.h,v 1.56 2013/07/19 07:37:48 markus Exp $ */ +/* $OpenBSD: kex.h,v 1.57 2013/11/02 21:59:15 markus Exp $ */ /* * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. @@ -40,6 +40,7 @@ #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256" #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384" #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521" +#define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org" #define COMP_NONE 0 #define COMP_ZLIB 1 @@ -71,6 +72,7 @@ enum kex_exchange { KEX_DH_GEX_SHA1, KEX_DH_GEX_SHA256, KEX_ECDH_SHA2, + KEX_C25519_SHA256, KEX_MAX }; @@ -158,6 +160,8 @@ void kexgex_client(Kex *); void kexgex_server(Kex *); void kexecdh_client(Kex *); void kexecdh_server(Kex *); +void kexc25519_client(Kex *); +void kexc25519_server(Kex *); void kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, @@ -170,6 +174,19 @@ void kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, const BIGNUM *, u_char **, u_int *); +void +kex_c25519_hash(const EVP_MD *, char *, char *, char *, int, + char *, int, u_char *, int, const u_char *, const u_char *, + const BIGNUM *, u_char **, u_int *); + +#define CURVE25519_SIZE 32 +void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE]) + __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE))) + __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE))); +BIGNUM *kexc25519_shared_key(const u_char[CURVE25519_SIZE], + const u_char[CURVE25519_SIZE]) + __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE))) + __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE))); void derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); diff --git a/usr.bin/ssh/kexc25519.c b/usr.bin/ssh/kexc25519.c new file mode 100644 index 00000000000..991a06f7c04 --- /dev/null +++ b/usr.bin/ssh/kexc25519.c @@ -0,0 +1,124 @@ +/* + * Copyright (c) 2001, 2013 Markus Friedl. All rights reserved. + * Copyright (c) 2010 Damien Miller. All rights reserved. + * Copyright (c) 2013 Aris Adamantiadis. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> + +#include <signal.h> +#include <string.h> + +#include <openssl/bn.h> +#include <openssl/evp.h> + +#include "buffer.h" +#include "ssh2.h" +#include "key.h" +#include "cipher.h" +#include "kex.h" +#include "log.h" + +extern int crypto_scalarmult_curve25519(u_char a[CURVE25519_SIZE], + const u_char b[CURVE25519_SIZE], const u_char c[CURVE25519_SIZE]) + __attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE))) + __attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE))) + __attribute__((__bounded__(__minbytes__, 3, CURVE25519_SIZE))); + +void +kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE]) +{ + static const u_char basepoint[CURVE25519_SIZE] = {9}; + + arc4random_buf(key, CURVE25519_SIZE); + crypto_scalarmult_curve25519(pub, key, basepoint); +} + +BIGNUM * +kexc25519_shared_key(const u_char key[CURVE25519_SIZE], + const u_char pub[CURVE25519_SIZE]) +{ + u_char shared_key[CURVE25519_SIZE]; + BIGNUM *shared_secret; + + crypto_scalarmult_curve25519(shared_key, key, pub); +#ifdef DEBUG_KEXECDH + dump_digest("shared secret", shared_key, CURVE25519_SIZE); +#endif + if ((shared_secret = BN_new()) == NULL) + fatal("%s: BN_new failed", __func__); + if (BN_bin2bn(shared_key, sizeof(shared_key), shared_secret) == NULL) + fatal("%s: BN_bin2bn failed", __func__); + memset(shared_key, 0, CURVE25519_SIZE); /* XXX explicit_bzero() */ + return (shared_secret); +} + +void +kex_c25519_hash( + const EVP_MD *evp_md, + char *client_version_string, + char *server_version_string, + char *ckexinit, int ckexinitlen, + char *skexinit, int skexinitlen, + u_char *serverhostkeyblob, int sbloblen, + const u_char client_dh_pub[CURVE25519_SIZE], + const u_char server_dh_pub[CURVE25519_SIZE], + const BIGNUM *shared_secret, + u_char **hash, u_int *hashlen) +{ + Buffer b; + EVP_MD_CTX md; + static u_char digest[EVP_MAX_MD_SIZE]; + + 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_put_bignum2(&b, shared_secret); + +#ifdef DEBUG_KEX + buffer_dump(&b); +#endif + EVP_DigestInit(&md, evp_md); + EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); + EVP_DigestFinal(&md, digest, NULL); + + buffer_free(&b); + +#ifdef DEBUG_KEX + dump_digest("hash", digest, EVP_MD_size(evp_md)); +#endif + *hash = digest; + *hashlen = EVP_MD_size(evp_md); +} diff --git a/usr.bin/ssh/kexc25519c.c b/usr.bin/ssh/kexc25519c.c new file mode 100644 index 00000000000..b208817bb1d --- /dev/null +++ b/usr.bin/ssh/kexc25519c.c @@ -0,0 +1,125 @@ +/* + * Copyright (c) 2001 Markus Friedl. All rights reserved. + * Copyright (c) 2010 Damien Miller. All rights reserved. + * Copyright (c) 2013 Aris Adamantiadis. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> + +#include <stdio.h> +#include <string.h> +#include <signal.h> + +#include "xmalloc.h" +#include "buffer.h" +#include "key.h" +#include "cipher.h" +#include "kex.h" +#include "log.h" +#include "packet.h" +#include "ssh2.h" + +void +kexc25519_client(Kex *kex) +{ + BIGNUM *shared_secret; + 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; + + 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"); + +#ifdef DEBUG_KEXECDH + dump_digest("client private key:", client_key, sizeof(client_key)); +#endif + + debug("expecting SSH2_MSG_KEX_ECDH_REPLY"); + packet_read_expect(SSH2_MSG_KEX_ECDH_REPLY); + + /* 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"); + + /* Q_S, server public key */ + server_pubkey = packet_get_string(&slen); + if (slen != CURVE25519_SIZE) + fatal("Incorrect size for server Curve25519 pubkey: %d", slen); + +#ifdef DEBUG_KEXECDH + dump_digest("server public key:", server_pubkey, CURVE25519_SIZE); +#endif + + /* signed H */ + signature = packet_get_string(&slen); + packet_check_eom(); + + shared_secret = kexc25519_shared_key(client_key, server_pubkey); + + /* calc and verify H */ + kex_c25519_hash( + kex->evp_md, + kex->client_version_string, + kex->server_version_string, + buffer_ptr(&kex->my), buffer_len(&kex->my), + buffer_ptr(&kex->peer), buffer_len(&kex->peer), + server_host_key_blob, sbloblen, + client_pubkey, + server_pubkey, + 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); + + /* save session id */ + if (kex->session_id == NULL) { + kex->session_id_len = hashlen; + kex->session_id = xmalloc(kex->session_id_len); + memcpy(kex->session_id, hash, kex->session_id_len); + } + + kex_derive_keys(kex, hash, hashlen, shared_secret); + BN_clear_free(shared_secret); + kex_finish(kex); +} diff --git a/usr.bin/ssh/kexc25519s.c b/usr.bin/ssh/kexc25519s.c new file mode 100644 index 00000000000..28463d03f50 --- /dev/null +++ b/usr.bin/ssh/kexc25519s.c @@ -0,0 +1,120 @@ +/* + * Copyright (c) 2001 Markus Friedl. All rights reserved. + * Copyright (c) 2010 Damien Miller. All rights reserved. + * Copyright (c) 2013 Aris Adamantiadis. All rights reserved. + * + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <string.h> +#include <signal.h> + +#include "xmalloc.h" +#include "buffer.h" +#include "key.h" +#include "cipher.h" +#include "kex.h" +#include "log.h" +#include "packet.h" +#include "ssh2.h" + +void +kexc25519_server(Kex *kex) +{ + BIGNUM *shared_secret; + Key *server_host_private, *server_host_public; + 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; + + /* 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(); + +#ifdef DEBUG_KEXECDH + dump_digest("client public key:", client_pubkey, CURVE25519_SIZE); +#endif + + shared_secret = kexc25519_shared_key(server_key, client_pubkey); + + /* calc H */ + key_to_blob(server_host_public, &server_host_key_blob, &sbloblen); + kex_c25519_hash( + kex->evp_md, + kex->client_version_string, + kex->server_version_string, + buffer_ptr(&kex->peer), buffer_len(&kex->peer), + buffer_ptr(&kex->my), buffer_len(&kex->my), + server_host_key_blob, sbloblen, + client_pubkey, + server_pubkey, + shared_secret, + &hash, &hashlen + ); + + /* save session id := H */ + if (kex->session_id == NULL) { + kex->session_id_len = hashlen; + kex->session_id = xmalloc(kex->session_id_len); + 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(); */ + + /* 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(); + + free(signature); + free(server_host_key_blob); + /* have keys, free server key */ + free(client_pubkey); + kex_derive_keys(kex, hash, hashlen, shared_secret); + BN_clear_free(shared_secret); + kex_finish(kex); +} diff --git a/usr.bin/ssh/lib/Makefile b/usr.bin/ssh/lib/Makefile index c4bc546cd21..81f069f1a9a 100644 --- a/usr.bin/ssh/lib/Makefile +++ b/usr.bin/ssh/lib/Makefile @@ -1,4 +1,4 @@ -# $OpenBSD: Makefile,v 1.67 2013/01/17 23:00:01 djm Exp $ +# $OpenBSD: Makefile,v 1.68 2013/11/02 21:59:15 markus Exp $ .PATH: ${.CURDIR}/.. .include "${.CURDIR}/../Makefile.inc" @@ -13,7 +13,7 @@ SRCS= authfd.c authfile.c bufaux.c bufec.c bufbn.c buffer.c canohost.c \ ssh-dss.c ssh-rsa.c ssh-ecdsa.c dh.c kexdh.c kexgex.c kexecdh.c \ kexdhc.c kexgexc.c kexecdhc.c msg.c progressmeter.c dns.c \ monitor_fdpass.c umac.c addrmatch.c schnorr.c jpake.c ssh-pkcs11.c \ - krl.c + krl.c smult_curve25519_ref.c kexc25519.c kexc25519c.c SRCS+= umac128.c CLEANFILES+= umac128.c diff --git a/usr.bin/ssh/myproposal.h b/usr.bin/ssh/myproposal.h index 22a4f3998e7..9a0cc63d218 100644 --- a/usr.bin/ssh/myproposal.h +++ b/usr.bin/ssh/myproposal.h @@ -1,4 +1,4 @@ -/* $OpenBSD: myproposal.h,v 1.32 2013/01/08 18:49:04 markus Exp $ */ +/* $OpenBSD: myproposal.h,v 1.33 2013/11/02 21:59:15 markus Exp $ */ /* * Copyright (c) 2000 Markus Friedl. All rights reserved. @@ -25,6 +25,7 @@ */ #define KEX_DEFAULT_KEX \ + "curve25519-sha256@libssh.org," \ "ecdh-sha2-nistp256," \ "ecdh-sha2-nistp384," \ "ecdh-sha2-nistp521," \ diff --git a/usr.bin/ssh/smult_curve25519_ref.c b/usr.bin/ssh/smult_curve25519_ref.c new file mode 100644 index 00000000000..036d6e733d1 --- /dev/null +++ b/usr.bin/ssh/smult_curve25519_ref.c @@ -0,0 +1,264 @@ +/* +version 20081011 +Matthew Dempsky +Public domain. +Derived from public domain code by D. J. Bernstein. +*/ + +int crypto_scalarmult_curve25519(unsigned char *, const unsigned char *, const unsigned char *); + +static void add(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int j; + unsigned int u; + u = 0; + for (j = 0;j < 31;++j) { u += a[j] + b[j]; out[j] = u & 255; u >>= 8; } + u += a[31] + b[31]; out[31] = u; +} + +static void sub(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int j; + unsigned int u; + u = 218; + for (j = 0;j < 31;++j) { + u += a[j] + 65280 - b[j]; + out[j] = u & 255; + u >>= 8; + } + u += a[31] - b[31]; + out[31] = u; +} + +static void squeeze(unsigned int a[32]) +{ + unsigned int j; + unsigned int u; + u = 0; + for (j = 0;j < 31;++j) { u += a[j]; a[j] = u & 255; u >>= 8; } + u += a[31]; a[31] = u & 127; + u = 19 * (u >> 7); + for (j = 0;j < 31;++j) { u += a[j]; a[j] = u & 255; u >>= 8; } + u += a[31]; a[31] = u; +} + +static const unsigned int minusp[32] = { + 19, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128 +} ; + +static void freeze(unsigned int a[32]) +{ + unsigned int aorig[32]; + unsigned int j; + unsigned int negative; + + for (j = 0;j < 32;++j) aorig[j] = a[j]; + add(a,a,minusp); + negative = -((a[31] >> 7) & 1); + for (j = 0;j < 32;++j) a[j] ^= negative & (aorig[j] ^ a[j]); +} + +static void mult(unsigned int out[32],const unsigned int a[32],const unsigned int b[32]) +{ + unsigned int i; + unsigned int j; + unsigned int u; + + for (i = 0;i < 32;++i) { + u = 0; + for (j = 0;j <= i;++j) u += a[j] * b[i - j]; + for (j = i + 1;j < 32;++j) u += 38 * a[j] * b[i + 32 - j]; + out[i] = u; + } + squeeze(out); +} + +static void mult121665(unsigned int out[32],const unsigned int a[32]) +{ + unsigned int j; + unsigned int u; + + u = 0; + for (j = 0;j < 31;++j) { u += 121665 * a[j]; out[j] = u & 255; u >>= 8; } + u += 121665 * a[31]; out[31] = u & 127; + u = 19 * (u >> 7); + for (j = 0;j < 31;++j) { u += out[j]; out[j] = u & 255; u >>= 8; } + u += out[j]; out[j] = u; +} + +static void square(unsigned int out[32],const unsigned int a[32]) +{ + unsigned int i; + unsigned int j; + unsigned int u; + + for (i = 0;i < 32;++i) { + u = 0; + for (j = 0;j < i - j;++j) u += a[j] * a[i - j]; + for (j = i + 1;j < i + 32 - j;++j) u += 38 * a[j] * a[i + 32 - j]; + u *= 2; + if ((i & 1) == 0) { + u += a[i / 2] * a[i / 2]; + u += 38 * a[i / 2 + 16] * a[i / 2 + 16]; + } + out[i] = u; + } + squeeze(out); +} + +static void select(unsigned int p[64],unsigned int q[64],const unsigned int r[64],const unsigned int s[64],unsigned int b) +{ + unsigned int j; + unsigned int t; + unsigned int bminus1; + + bminus1 = b - 1; + for (j = 0;j < 64;++j) { + t = bminus1 & (r[j] ^ s[j]); + p[j] = s[j] ^ t; + q[j] = r[j] ^ t; + } +} + +static void mainloop(unsigned int work[64],const unsigned char e[32]) +{ + unsigned int xzm1[64]; + unsigned int xzm[64]; + unsigned int xzmb[64]; + unsigned int xzm1b[64]; + unsigned int xznb[64]; + unsigned int xzn1b[64]; + unsigned int a0[64]; + unsigned int a1[64]; + unsigned int b0[64]; + unsigned int b1[64]; + unsigned int c1[64]; + unsigned int r[32]; + unsigned int s[32]; + unsigned int t[32]; + unsigned int u[32]; + unsigned int j; + unsigned int b; + int pos; + + for (j = 0;j < 32;++j) xzm1[j] = work[j]; + xzm1[32] = 1; + for (j = 33;j < 64;++j) xzm1[j] = 0; + + xzm[0] = 1; + for (j = 1;j < 64;++j) xzm[j] = 0; + + for (pos = 254;pos >= 0;--pos) { + b = e[pos / 8] >> (pos & 7); + b &= 1; + select(xzmb,xzm1b,xzm,xzm1,b); + add(a0,xzmb,xzmb + 32); + sub(a0 + 32,xzmb,xzmb + 32); + add(a1,xzm1b,xzm1b + 32); + sub(a1 + 32,xzm1b,xzm1b + 32); + square(b0,a0); + square(b0 + 32,a0 + 32); + mult(b1,a1,a0 + 32); + mult(b1 + 32,a1 + 32,a0); + add(c1,b1,b1 + 32); + sub(c1 + 32,b1,b1 + 32); + square(r,c1 + 32); + sub(s,b0,b0 + 32); + mult121665(t,s); + add(u,t,b0); + mult(xznb,b0,b0 + 32); + mult(xznb + 32,s,u); + square(xzn1b,c1); + mult(xzn1b + 32,r,work); + select(xzm,xzm1,xznb,xzn1b,b); + } + + for (j = 0;j < 64;++j) work[j] = xzm[j]; +} + +static void recip(unsigned int out[32],const unsigned int z[32]) +{ + unsigned int z2[32]; + unsigned int z9[32]; + unsigned int z11[32]; + unsigned int z2_5_0[32]; + unsigned int z2_10_0[32]; + unsigned int z2_20_0[32]; + unsigned int z2_50_0[32]; + unsigned int z2_100_0[32]; + unsigned int t0[32]; + unsigned int t1[32]; + int i; + + /* 2 */ square(z2,z); + /* 4 */ square(t1,z2); + /* 8 */ square(t0,t1); + /* 9 */ mult(z9,t0,z); + /* 11 */ mult(z11,z9,z2); + /* 22 */ square(t0,z11); + /* 2^5 - 2^0 = 31 */ mult(z2_5_0,t0,z9); + + /* 2^6 - 2^1 */ square(t0,z2_5_0); + /* 2^7 - 2^2 */ square(t1,t0); + /* 2^8 - 2^3 */ square(t0,t1); + /* 2^9 - 2^4 */ square(t1,t0); + /* 2^10 - 2^5 */ square(t0,t1); + /* 2^10 - 2^0 */ mult(z2_10_0,t0,z2_5_0); + + /* 2^11 - 2^1 */ square(t0,z2_10_0); + /* 2^12 - 2^2 */ square(t1,t0); + /* 2^20 - 2^10 */ for (i = 2;i < 10;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^20 - 2^0 */ mult(z2_20_0,t1,z2_10_0); + + /* 2^21 - 2^1 */ square(t0,z2_20_0); + /* 2^22 - 2^2 */ square(t1,t0); + /* 2^40 - 2^20 */ for (i = 2;i < 20;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^40 - 2^0 */ mult(t0,t1,z2_20_0); + + /* 2^41 - 2^1 */ square(t1,t0); + /* 2^42 - 2^2 */ square(t0,t1); + /* 2^50 - 2^10 */ for (i = 2;i < 10;i += 2) { square(t1,t0); square(t0,t1); } + /* 2^50 - 2^0 */ mult(z2_50_0,t0,z2_10_0); + + /* 2^51 - 2^1 */ square(t0,z2_50_0); + /* 2^52 - 2^2 */ square(t1,t0); + /* 2^100 - 2^50 */ for (i = 2;i < 50;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^100 - 2^0 */ mult(z2_100_0,t1,z2_50_0); + + /* 2^101 - 2^1 */ square(t1,z2_100_0); + /* 2^102 - 2^2 */ square(t0,t1); + /* 2^200 - 2^100 */ for (i = 2;i < 100;i += 2) { square(t1,t0); square(t0,t1); } + /* 2^200 - 2^0 */ mult(t1,t0,z2_100_0); + + /* 2^201 - 2^1 */ square(t0,t1); + /* 2^202 - 2^2 */ square(t1,t0); + /* 2^250 - 2^50 */ for (i = 2;i < 50;i += 2) { square(t0,t1); square(t1,t0); } + /* 2^250 - 2^0 */ mult(t0,t1,z2_50_0); + + /* 2^251 - 2^1 */ square(t1,t0); + /* 2^252 - 2^2 */ square(t0,t1); + /* 2^253 - 2^3 */ square(t1,t0); + /* 2^254 - 2^4 */ square(t0,t1); + /* 2^255 - 2^5 */ square(t1,t0); + /* 2^255 - 21 */ mult(out,t1,z11); +} + +int crypto_scalarmult_curve25519(unsigned char *q, + const unsigned char *n, + const unsigned char *p) +{ + unsigned int work[96]; + unsigned char e[32]; + unsigned int i; + for (i = 0;i < 32;++i) e[i] = n[i]; + e[0] &= 248; + e[31] &= 127; + e[31] |= 64; + for (i = 0;i < 32;++i) work[i] = p[i]; + mainloop(work,e); + recip(work + 32,work + 32); + mult(work + 64,work,work + 32); + freeze(work + 64); + for (i = 0;i < 32;++i) q[i] = work[64 + i]; + return 0; +} diff --git a/usr.bin/ssh/ssh-keyscan.c b/usr.bin/ssh/ssh-keyscan.c index 660e4e06efa..137674cf69b 100644 --- a/usr.bin/ssh/ssh-keyscan.c +++ b/usr.bin/ssh/ssh-keyscan.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ssh-keyscan.c,v 1.87 2013/05/17 00:13:14 djm Exp $ */ +/* $OpenBSD: ssh-keyscan.c,v 1.88 2013/11/02 21:59:15 markus Exp $ */ /* * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. * @@ -239,6 +239,7 @@ keygrab_ssh2(con *c) c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client; + c->c_kex->kex[KEX_C25519_SHA256] = kexc25519_client; c->c_kex->verify_host_key = hostjump; if (!(j = setjmp(kexjmp))) { diff --git a/usr.bin/ssh/sshconnect2.c b/usr.bin/ssh/sshconnect2.c index a5e621ea81b..1572fe457f6 100644 --- a/usr.bin/ssh/sshconnect2.c +++ b/usr.bin/ssh/sshconnect2.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sshconnect2.c,v 1.198 2013/06/05 12:52:38 dtucker Exp $ */ +/* $OpenBSD: sshconnect2.c,v 1.199 2013/11/02 21:59:15 markus Exp $ */ /* * Copyright (c) 2000 Markus Friedl. All rights reserved. * Copyright (c) 2008 Damien Miller. All rights reserved. @@ -202,6 +202,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port) kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; kex->kex[KEX_ECDH_SHA2] = kexecdh_client; + kex->kex[KEX_C25519_SHA256] = kexc25519_client; kex->client_version_string=client_version_string; kex->server_version_string=server_version_string; kex->verify_host_key=&verify_host_key_callback; diff --git a/usr.bin/ssh/sshd.c b/usr.bin/ssh/sshd.c index 006a90a529e..09ba9d8c6d6 100644 --- a/usr.bin/ssh/sshd.c +++ b/usr.bin/ssh/sshd.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sshd.c,v 1.409 2013/10/23 23:35:32 djm Exp $ */ +/* $OpenBSD: sshd.c,v 1.410 2013/11/02 21:59:15 markus Exp $ */ /* * Author: Tatu Ylonen <ylo@cs.hut.fi> * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland @@ -2305,6 +2305,7 @@ do_ssh2_kex(void) kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; kex->kex[KEX_ECDH_SHA2] = kexecdh_server; + kex->kex[KEX_C25519_SHA256] = kexc25519_server; kex->server = 1; kex->client_version_string=client_version_string; kex->server_version_string=server_version_string; diff --git a/usr.bin/ssh/sshd/Makefile b/usr.bin/ssh/sshd/Makefile index d59607c9417..c9f0b8e853c 100644 --- a/usr.bin/ssh/sshd/Makefile +++ b/usr.bin/ssh/sshd/Makefile @@ -1,4 +1,4 @@ -# $OpenBSD: Makefile,v 1.79 2013/08/10 10:19:35 ajacoutot Exp $ +# $OpenBSD: Makefile,v 1.80 2013/11/02 21:59:15 markus Exp $ .PATH: ${.CURDIR}/.. @@ -16,7 +16,8 @@ SRCS= sshd.c auth-rhosts.c auth-passwd.c auth-rsa.c auth-rh-rsa.c \ auth2-none.c auth2-passwd.c auth2-pubkey.c \ monitor_mm.c monitor.c monitor_wrap.c \ kexdhs.c kexgexs.c kexecdhs.c sftp-server.c sftp-common.c \ - roaming_common.c roaming_serv.c sandbox-systrace.c + roaming_common.c roaming_serv.c sandbox-systrace.c \ + kexc25519s.c .include <bsd.own.mk> # for KERBEROS and AFS |