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extern const struct ssh_kex ssh_diffiehellman;
const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman };
extern const struct ssh_hostkey ssh_dss;
const static struct ssh_hostkey *hostkey_algs[] = { &ssh_dss };
extern const struct ssh_mac ssh_sha1, ssh_sha1_buggy;
extern const struct ssh_mac ssh_md5, ssh_sha1, ssh_sha1_buggy;
static void nullmac_key(unsigned char *key) { }
static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { }
static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; }
const static struct ssh_mac ssh_mac_none = {
nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0
};
const static struct ssh_mac *macs[] = { &ssh_sha1, &ssh_mac_none };
const static struct ssh_mac *buggymacs[] = { &ssh_sha1_buggy, &ssh_mac_none };
const static struct ssh_mac *macs[] = {
&ssh_sha1, &ssh_md5, &ssh_mac_none };
const static struct ssh_mac *buggymacs[] = {
&ssh_sha1_buggy, &ssh_md5, &ssh_mac_none };
const static struct ssh_compress ssh_comp_none = {
"none"
};
const static struct ssh_compress *compressions[] = { &ssh_comp_none };
/*
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*/
static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt)
{
static int i, len;
static char *str;
static Bignum e, f, K;
static const struct ssh_mac **maclist;
static int nmacs;
static const struct ssh_cipher *cscipher_tobe = NULL;
static const struct ssh_cipher *sccipher_tobe = NULL;
static const struct ssh_mac *csmac_tobe = NULL;
static const struct ssh_mac *scmac_tobe = NULL;
static const struct ssh_compress *cscomp_tobe = NULL;
static const struct ssh_compress *sccomp_tobe = NULL;
static char *hostkeydata, *sigdata, *keystr, *fingerprint;
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preferred_cipher = &ssh_3des_ssh2;
}
/*
* Be prepared to work around the buggy MAC problem.
*/
if (cfg.buggymac)
maclist = buggymacs;
maclist = buggymacs, nmacs = lenof(buggymacs);
else
maclist = macs;
maclist = macs, nmacs = lenof(macs);
begin_key_exchange:
/*
* Construct and send our key exchange packet.
*/
ssh2_pkt_init(SSH2_MSG_KEXINIT);
for (i = 0; i < 16; i++)
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const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1];
ssh2_pkt_addstring_str(c->name);
if (i < lenof(ciphers))
ssh2_pkt_addstring_str(",");
}
/* List client->server MAC algorithms. */
ssh2_pkt_addstring_start();
for (i = 0; i < lenof(maclist); i++) {
for (i = 0; i < nmacs; i++) {
ssh2_pkt_addstring_str(maclist[i]->name);
if (i < lenof(maclist)-1)
if (i < nmacs-1)
ssh2_pkt_addstring_str(",");
}
/* List server->client MAC algorithms. */
ssh2_pkt_addstring_start();
for (i = 0; i < lenof(maclist); i++) {
for (i = 0; i < nmacs; i++) {
ssh2_pkt_addstring_str(maclist[i]->name);
if (i < lenof(maclist)-1)
if (i < nmacs-1)
ssh2_pkt_addstring_str(",");
}
/* List client->server compression algorithms. */
ssh2_pkt_addstring_start();
for (i = 0; i < lenof(compressions); i++) {
ssh2_pkt_addstring_str(compressions[i]->name);
if (i < lenof(compressions)-1)
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const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1];
if (in_commasep_string(c->name, str, len)) {
sccipher_tobe = c;
break;
}
}
ssh2_pkt_getstring(&str, &len); /* client->server mac */
for (i = 0; i < lenof(maclist); i++) {
for (i = 0; i < nmacs; i++) {
if (in_commasep_string(maclist[i]->name, str, len)) {
csmac_tobe = maclist[i];
break;
}
}
ssh2_pkt_getstring(&str, &len); /* server->client mac */
for (i = 0; i < lenof(maclist); i++) {
for (i = 0; i < nmacs; i++) {
if (in_commasep_string(maclist[i]->name, str, len)) {
scmac_tobe = maclist[i];
break;
}
}
ssh2_pkt_getstring(&str, &len); /* client->server compression */
for (i = 0; i < lenof(compressions); i++) {
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