static void
roaming_auth_required(void)
{
u_char digest[SSH_DIGEST_MAX_LENGTH];
Buffer b;
u_int64_t chall, oldchall;
chall = packet_get_int64();
oldchall = packet_get_int64();
if (oldchall != lastseenchall) {
key1 = oldkey1;
key2 = oldkey2;
}
lastseenchall = chall;
buffer_init(&b);
buffer_put_int64(&b, cookie);
buffer_put_int64(&b, chall);
if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, digest, sizeof(digest)) != 0)
fatal("%s: ssh_digest_buffer failed", __func__);
buffer_free(&b);
packet_start(SSH2_MSG_KEX_ROAMING_AUTH);
packet_put_int64(key1 ^ get_recv_bytes());
packet_put_raw(digest, ssh_digest_bytes(SSH_DIGEST_SHA1));
packet_send();
oldkey1 = key1;
oldkey2 = key2;
calculate_new_key(&key1, cookie, chall);
calculate_new_key(&key2, cookie, chall);
debug("Received %llu bytes", (unsigned long long)get_recv_bytes());
debug("Sent roaming_auth packet");
}
int
kexgex_hash(
int hash_alg,
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)
{
struct sshbuf *b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
int r;
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;
}
#ifdef DEBUG_KEXDH
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, b, digest, sizeof(digest)) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hash = digest;
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEXDH
dump_digest("hash", digest, *hashlen);
#endif
return 0;
}
void
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)
{
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);
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);
}
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);
#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;
*hashlen = ssh_digest_bytes(hash_alg);
}
int
kex_ecdh_hash(
int hash_alg,
const EC_GROUP *ec_group,
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, size_t *hashlen)
{
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
sshbuf_dump(b, stderr);
#endif
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;
}
void
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 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)
{
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);
#ifdef DEBUG_KEX
buffer_dump(&b);
#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;
*hashlen = ssh_digest_bytes(hash_alg);
}
/*
* Caclulate a new key after a reconnect
*/
void
calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
{
u_char hash[SSH_DIGEST_MAX_LENGTH];
Buffer b;
buffer_init(&b);
buffer_put_int64(&b, *key);
buffer_put_int64(&b, cookie);
buffer_put_int64(&b, challenge);
if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, hash, sizeof(hash)) != 0)
fatal("%s: digest_buffer failed", __func__);
buffer_clear(&b);
buffer_append(&b, hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
*key = buffer_get_int64(&b);
buffer_free(&b);
}
/*
* Caclulate a new key after a reconnect
*/
void
calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
{
u_char hash[SSH_DIGEST_MAX_LENGTH];
struct sshbuf *b;
int r;
if ((b = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u64(b, *key)) != 0 ||
(r = sshbuf_put_u64(b, cookie)) != 0 ||
(r = sshbuf_put_u64(b, challenge)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, sizeof(hash)) != 0)
fatal("%s: digest_buffer failed", __func__);
sshbuf_reset(b);
if ((r = sshbuf_put(b, hash, ssh_digest_bytes(SSH_DIGEST_SHA1))) != 0 ||
(r = sshbuf_get_u64(b, key)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
sshbuf_free(b);
}