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;
debug("got SSH2_MSG_KEX_DH_GEX_GROUP");
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, kex->dh);
fprintf(stderr, "pub= ");
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;
}
int
kexdh_client(struct ssh *ssh)
{
struct kex *kex = ssh->kex;
int r;
/* generate and send 'e', client DH public key */
switch (kex->kex_type) {
case KEX_DH_GRP1_SHA1:
kex->dh = dh_new_group1();
break;
case KEX_DH_GRP14_SHA1:
case KEX_DH_GRP14_SHA256:
kex->dh = dh_new_group14();
break;
case KEX_DH_GRP16_SHA512:
kex->dh = dh_new_group16();
break;
case KEX_DH_GRP18_SHA512:
kex->dh = dh_new_group18();
break;
default:
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if (kex->dh == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
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, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
debug("expecting SSH2_MSG_KEXDH_REPLY");
ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_REPLY, &input_kex_dh);
r = 0;
out:
return r;
}
void
kexdh_client(Kex *kex)
{
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;
/* generate and send 'e', client DH public key */
switch (kex->kex_type) {
case KEX_DH_GRP1_SHA1:
dh = dh_new_group1();
break;
case KEX_DH_GRP14_SHA1:
dh = dh_new_group14();
break;
default:
fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
}
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");
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
fprintf(stderr, "\n");
#endif
debug("expecting SSH2_MSG_KEXDH_REPLY");
packet_read_expect(SSH2_MSG_KEXDH_REPLY);
/* 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");
/* 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);
#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
/* 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");
#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");
memset(kbuf, 0, klen);
free(kbuf);
/* calc and verify H */
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),
server_host_key_blob, sbloblen,
dh->pub_key,
dh_server_pub,
shared_secret,
&hash, &hashlen
);
free(server_host_key_blob);
BN_clear_free(dh_server_pub);
DH_free(dh);
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);
}
void
kexgex_server(Kex *kex)
{
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;
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);
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();
min = MAX(DH_GRP_MIN, min);
max = MIN(DH_GRP_MAX, max);
nbits = MAX(DH_GRP_MIN, nbits);
nbits = MIN(DH_GRP_MAX, nbits);
break;
case SSH2_MSG_KEX_DH_GEX_REQUEST_OLD:
debug("SSH2_MSG_KEX_DH_GEX_REQUEST_OLD received");
onbits = nbits = packet_get_int();
/* unused for old GEX */
omin = min = DH_GRP_MIN;
omax = max = DH_GRP_MAX;
break;
default:
fatal("protocol error during kex, no DH_GEX_REQUEST: %d", type);
}
packet_check_eom();
if (omax < omin || onbits < omin || omax < onbits)
fatal("DH_GEX_REQUEST, bad parameters: %d !< %d !< %d",
omin, onbits, omax);
/* Contact privileged parent */
dh = PRIVSEP(choose_dh(min, nbits, max));
if (dh == NULL)
packet_disconnect("Protocol error: no matching DH grp found");
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();
/* Compute our exchange value in parallel with the client */
dh_gen_key(dh, kex->we_need * 8);
debug("expecting SSH2_MSG_KEX_DH_GEX_INIT");
packet_read_expect(SSH2_MSG_KEX_DH_GEX_INIT);
/* key, cert */
if ((dh_client_pub = BN_new()) == NULL)
fatal("dh_client_pub == NULL");
packet_get_bignum2(dh_client_pub);
packet_check_eom();
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_client_pub= ");
BN_print_fp(stderr, dh_client_pub);
fprintf(stderr, "\n");
debug("bits %d", BN_num_bits(dh_client_pub));
#endif
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
fprintf(stderr, "\n");
#endif
if (!dh_pub_is_valid(dh, dh_client_pub))
packet_disconnect("bad client public DH value");
klen = DH_size(dh);
kbuf = xmalloc(klen);
if ((kout = DH_compute_key(kbuf, dh_client_pub, dh)) < 0)
fatal("DH_compute_key: failed");
#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");
memset(kbuf, 0, 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;
/* calc H */
kexgex_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,
omin, onbits, omax,
dh->p, dh->g,
dh_client_pub,
dh->pub_key,
shared_secret,
&hash, &hashlen
);
BN_clear_free(dh_client_pub);
/* 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, 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();
free(signature);
free(server_host_key_blob);
/* have keys, free DH */
DH_free(dh);
kex_derive_keys(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
}
int main (int argc,
const char *argv[])
{
DH *c_dh = NULL;
DH *s_dh = NULL;
unsigned char *c_keybuf = NULL;
unsigned char *s_keybuf = NULL;
int c_keylen = 0, s_keylen = 0, i = 0;
const BIGNUM *pub_key;
/* TBD -- Generate random private keys */
/* Generate initial DH params on the client side */
if (NULL == (c_dh = tr_create_dh_params(NULL, 0))) {
printf("Error: Can't create client DH params, exiting.\n");
exit(1);
}
fprintf(stderr, "Client DH Parameters:\n");
DHparams_print_fp(stdout, c_dh);
fprintf(stderr, "\n");
/*** Would now send DH params and client's public key to the server ***/
/* Generate DH params on the server side */
if (NULL == (s_dh = tr_create_matching_dh(NULL, 0, c_dh))) {
printf("Error: Can't create server server DH params, exiting.\n");
exit(1);
}
fprintf(stdout, "Server DH Parameters:\n");
DHparams_print_fp(stdout, s_dh);
fprintf(stdout, "\n");
/*** Would now send server's pub key to client ***/
/* Compute key on client */
DH_get0_key(s_dh, &pub_key, NULL);
if (0 > (c_keylen = tr_compute_dh_key(&c_keybuf,
pub_key,
c_dh))) {
printf("Error: Can't compute client key.\n");
}
/* Compute key on server */
DH_get0_key(c_dh, &pub_key, NULL);
if (0 > (s_keylen = tr_compute_dh_key(&s_keybuf,
pub_key,
s_dh))) {
printf("Error: Can't compute server key.\n");
exit(1);
}
/* Print out the client key. */
printf("Client Key Generated (len = %d):\n", c_keylen);
for (i = 0; i < c_keylen; i++) {
printf("%2x", c_keybuf[i]);
}
printf("\n");
/* Print out the server key. */
printf("Server Key Generated (len = %d):\n", s_keylen);
for (i = 0; i < s_keylen; i++) {
printf("%2x", s_keybuf[i]);
}
printf("\n");
/* Compare the two keys to see if they match */
if ((c_keylen != s_keylen) ||
(0 != memcmp(c_keybuf, s_keybuf, c_keylen))) {
printf("Error: Different keys generated!\n");
exit(1);
}
printf("Success: Identical keys generated, key length = %d!\n", c_keylen);
exit(0);
}
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) {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
server_host_public = kex->load_host_public_key(kex->hostkey_type,
kex->hostkey_nid, ssh);
server_host_private = kex->load_host_private_key(kex->hostkey_type,
kex->hostkey_nid, ssh);
if (server_host_public == NULL) {
r = SSH_ERR_NO_HOSTKEY_LOADED;
goto out;
}
/* key, cert */
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= ");
BN_print_fp(stderr, dh_client_pub);
fprintf(stderr, "\n");
debug("bits %d", BN_num_bits(dh_client_pub));
#endif
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, kex->dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, kex->dh->pub_key);
fprintf(stderr, "\n");
#endif
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(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 ((r = sshkey_to_blob(server_host_public, &server_host_key_blob,
&sbloblen)) != 0)
goto out;
/* calc H */
hashlen = sizeof(hash);
if ((r = kex_dh_hash(
kex->client_version_string,
kex->server_version_string,
sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
sshbuf_ptr(kex->my), sshbuf_len(kex->my),
server_host_key_blob, sbloblen,
dh_client_pub,
kex->dh->pub_key,
shared_secret,
hash, &hashlen)) != 0)
goto out;
/* save session id := H */
if (kex->session_id == NULL) {
kex->session_id_len = hashlen;
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 */
if ((r = kex->sign(server_host_private, server_host_public, &signature,
&slen, hash, hashlen, kex->hostkey_alg, ssh->compat)) < 0)
goto out;
/* destroy_sensitive_data(); */
/* send server hostkey, DH pubkey 'f' and singed H */
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;
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);
free(signature);
return r;
}
void
kexdh_server(Kex *kex)
{
BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
DH *dh;
Key *server_host_key;
u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
u_int sbloblen, klen, kout, hashlen;
u_int slen;
/* generate server DH public key */
switch (kex->kex_type) {
case KEX_DH_GRP1_SHA1:
dh = dh_new_group1();
break;
case KEX_DH_GRP14_SHA1:
dh = dh_new_group14();
break;
default:
fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
}
dh_gen_key(dh, kex->we_need * 8);
debug("expecting SSH2_MSG_KEXDH_INIT");
packet_read_expect(SSH2_MSG_KEXDH_INIT);
if (kex->load_host_key == NULL)
fatal("Cannot load hostkey");
server_host_key = kex->load_host_key(kex->hostkey_type);
if (server_host_key == NULL)
fatal("Unsupported hostkey type %d", kex->hostkey_type);
/* key, cert */
if ((dh_client_pub = BN_new()) == NULL)
fatal("dh_client_pub == NULL");
packet_get_bignum2(dh_client_pub);
packet_check_eom();
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_client_pub= ");
BN_print_fp(stderr, dh_client_pub);
fprintf(stderr, "\n");
debug("bits %d", BN_num_bits(dh_client_pub));
#endif
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
fprintf(stderr, "\n");
#endif
if (!dh_pub_is_valid(dh, dh_client_pub))
packet_disconnect("bad client public DH value");
klen = DH_size(dh);
kbuf = xmalloc(klen);
kout = DH_compute_key(kbuf, dh_client_pub, dh);
#ifdef DEBUG_KEXDH
dump_digest("shared secret", kbuf, kout);
#endif
if ((shared_secret = BN_new()) == NULL)
fatal("kexdh_server: BN_new failed");
BN_bin2bn(kbuf, kout, shared_secret);
memset(kbuf, 0, klen);
xfree(kbuf);
key_to_blob(server_host_key, &server_host_key_blob, &sbloblen);
/* calc H */
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),
server_host_key_blob, sbloblen,
dh_client_pub,
dh->pub_key,
shared_secret,
&hash, &hashlen
);
BN_clear_free(dh_client_pub);
/* 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 */
PRIVSEP(key_sign(server_host_key, &signature, &slen, hash, hashlen));
/* 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();
xfree(signature);
xfree(server_host_key_blob);
/* have keys, free DH */
DH_free(dh);
kex_derive_keys(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
}
EAPI void
eet_identity_print(Eet_Key *key,
FILE *out)
{
#ifdef HAVE_SIGNATURE
# ifdef HAVE_GNUTLS
const char *names[6] = {
"Modulus",
"Public exponent",
"Private exponent",
"First prime",
"Second prime",
"Coefficient"
};
int err = 0;
gnutls_datum_t data = { NULL, 0 };
gnutls_datum_t rsa_raw[6];
size_t size = 128;
char *res = NULL;
char buf[33];
unsigned int i, j;
if (!key)
return;
if (!emile_cipher_init()) return ;
if (key->private_key)
{
if (gnutls_x509_privkey_export_rsa_raw(key->private_key,
rsa_raw + 0, /* Modulus */
rsa_raw + 1, /* Public exponent */
rsa_raw + 2, /* Private exponent */
rsa_raw + 3, /* First prime */
rsa_raw + 4, /* Second prime */
rsa_raw + 5)) /* Coefficient */
goto on_error;
if (!(res = malloc(size)))
goto on_error;
fprintf(out, "Private Key:\n");
buf[32] = '\0';
for (i = 0; i < 6; i++)
{
while ((err = gnutls_hex_encode(rsa_raw + i, res, &size)) ==
GNUTLS_E_SHORT_MEMORY_BUFFER)
{
char *temp;
size += 128;
if (!(temp = realloc(res, size)))
goto on_error;
res = temp;
}
if (err)
goto on_error;
fprintf(out, "\t%s:\n", names[i]);
for (j = 0; strlen(res) > j; j += 32)
{
snprintf(buf, 32, "%s", res + j);
fprintf(out, "\t\t%s\n", buf);
}
}
free(res);
res = NULL;
}
if (key->certificate)
{
fprintf(out, "Public certificate:\n");
if (gnutls_x509_crt_print(key->certificate, GNUTLS_X509_CRT_FULL,
&data))
goto on_error;
fprintf(out, "%s\n", data.data);
gnutls_free(data.data);
data.data = NULL;
}
on_error:
if (res)
free(res);
if (data.data)
gnutls_free(data.data);
return;
# else /* ifdef HAVE_GNUTLS */
RSA *rsa;
DSA *dsa;
DH *dh;
if (!key)
return;
if (!emile_cipher_init()) return ;
rsa = EVP_PKEY_get1_RSA(key->private_key);
if (rsa)
{
fprintf(out, "Private key (RSA):\n");
RSA_print_fp(out, rsa, 0);
}
dsa = EVP_PKEY_get1_DSA(key->private_key);
if (dsa)
{
fprintf(out, "Private key (DSA):\n");
DSA_print_fp(out, dsa, 0);
}
dh = EVP_PKEY_get1_DH(key->private_key);
if (dh)
{
fprintf(out, "Private key (DH):\n");
DHparams_print_fp(out, dh);
}
fprintf(out, "Public certificate:\n");
X509_print_fp(out, key->certificate);
# endif /* ifdef HAVE_GNUTLS */
#else /* ifdef HAVE_SIGNATURE */
key = NULL;
out = NULL;
ERR("You need to compile signature support in EET.");
#endif /* ifdef HAVE_SIGNATURE */
}
void
kexgex_client(Kex *kex)
{
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;
nbits = dh_estimate(kex->dh_need * 8);
if (datafellows & 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);
} 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);
debug("SSH2_MSG_KEX_DH_GEX_REQUEST(%u<%u<%u) sent",
min, nbits, max);
}
#ifdef DEBUG_KEXDH
fprintf(stderr, "\nmin = %d, nbits = %d, max = %d\n",
min, nbits, max);
#endif
packet_send();
debug("expecting SSH2_MSG_KEX_DH_GEX_GROUP");
packet_read_expect(SSH2_MSG_KEX_DH_GEX_GROUP);
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();
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);
#ifdef DEBUG_KEXDH
DHparams_print_fp(stderr, dh);
fprintf(stderr, "pub= ");
BN_print_fp(stderr, dh->pub_key);
fprintf(stderr, "\n");
#endif
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);
/* 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");
/* 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);
#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
/* 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");
#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;
/* calc and verify H */
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),
server_host_key_blob, sbloblen,
min, nbits, max,
dh->p, dh->g,
dh->pub_key,
dh_server_pub,
shared_secret,
&hash, &hashlen
);
/* 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);
/* 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_bn(kex, hash, hashlen, shared_secret);
BN_clear_free(shared_secret);
kex_finish(kex);
}
inline void dh_key::print_parameters(file _file) const
{
throw_error_if_not(DHparams_print_fp(_file.raw(), ptr().get()) != 0);
}