#define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
#define SSH1_MSG_IGNORE 32 /* 0x20 */
#define SSH1_MSG_DEBUG 36 /* 0x24 */
+#define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
#define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
#define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
#define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
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_signkey ssh_dss;
+const static struct ssh_signkey *hostkey_algs[] = { &ssh_dss };
extern const struct ssh_mac ssh_md5, ssh_sha1, ssh_sha1_buggy;
const static struct ssh_mac *buggymacs[] = {
&ssh_sha1_buggy, &ssh_md5, &ssh_mac_none };
+static void ssh_comp_none_init(void) { }
+static int ssh_comp_none_block(unsigned char *block, int len,
+ unsigned char **outblock, int *outlen) {
+ return 0;
+}
const static struct ssh_compress ssh_comp_none = {
- "none"
+ "none",
+ ssh_comp_none_init, ssh_comp_none_block,
+ ssh_comp_none_init, ssh_comp_none_block
};
-const static struct ssh_compress *compressions[] = { &ssh_comp_none };
+extern const struct ssh_compress ssh_zlib;
+const static struct ssh_compress *compressions[] = {
+ &ssh_zlib, &ssh_comp_none };
/*
* 2-3-4 tree storing channels.
static Socket s = NULL;
static unsigned char session_key[32];
+static int ssh1_compressing;
+static int ssh_agentfwd_enabled;
static const struct ssh_cipher *cipher = NULL;
static const struct ssh_cipher *cscipher = NULL;
static const struct ssh_cipher *sccipher = NULL;
static const struct ssh_compress *cscomp = NULL;
static const struct ssh_compress *sccomp = NULL;
static const struct ssh_kex *kex = NULL;
-static const struct ssh_hostkey *hostkey = NULL;
+static const struct ssh_signkey *hostkey = NULL;
int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL;
static char *savedhost;
debug(("\r\n"));
#endif
- pktin.type = pktin.data[st->pad];
- pktin.body = pktin.data + st->pad + 1;
-
st->realcrc = crc32(pktin.data, st->biglen-4);
st->gotcrc = GET_32BIT(pktin.data+st->biglen-4);
if (st->gotcrc != st->realcrc) {
crReturn(0);
}
+ pktin.body = pktin.data + st->pad + 1;
+
+ if (ssh1_compressing) {
+ unsigned char *decompblk;
+ int decomplen;
+#if 0
+ int i;
+ debug(("Packet payload pre-decompression:\n"));
+ for (i = -1; i < pktin.length; i++)
+ debug((" %02x", (unsigned char)pktin.body[i]));
+ debug(("\r\n"));
+#endif
+ zlib_decompress_block(pktin.body-1, pktin.length+1,
+ &decompblk, &decomplen);
+
+ if (pktin.maxlen < st->pad + decomplen) {
+ pktin.maxlen = st->pad + decomplen;
+ pktin.data = realloc(pktin.data, pktin.maxlen+APIEXTRA);
+ if (!pktin.data)
+ fatalbox("Out of memory");
+ }
+
+ memcpy(pktin.body-1, decompblk, decomplen);
+ free(decompblk);
+ pktin.length = decomplen-1;
+#if 0
+ debug(("Packet payload post-decompression:\n"));
+ for (i = -1; i < pktin.length; i++)
+ debug((" %02x", (unsigned char)pktin.body[i]));
+ debug(("\r\n"));
+#endif
+ }
+
if (pktin.type == SSH1_SMSG_STDOUT_DATA ||
pktin.type == SSH1_SMSG_STDERR_DATA ||
pktin.type == SSH1_MSG_DEBUG ||
}
}
+ pktin.type = pktin.body[-1];
+
if (pktin.type == SSH1_MSG_DEBUG) {
/* log debug message */
char buf[80];
}
st->incoming_sequence++; /* whether or not we MACed */
+ /*
+ * Decompress packet payload.
+ */
+ {
+ unsigned char *newpayload;
+ int newlen;
+ if (sccomp && sccomp->decompress(pktin.data+5, pktin.length-5,
+ &newpayload, &newlen)) {
+ if (pktin.maxlen < newlen+5) {
+ pktin.maxlen = newlen+5;
+ pktin.data = (pktin.data == NULL ? malloc(pktin.maxlen+APIEXTRA) :
+ realloc(pktin.data, pktin.maxlen+APIEXTRA));
+ if (!pktin.data)
+ fatalbox("Out of memory");
+ }
+ pktin.length = 5 + newlen;
+ memcpy(pktin.data+5, newpayload, newlen);
+#if 0
+ debug(("Post-decompression payload:\r\n"));
+ for (st->i = 0; st->i < newlen; st->i++)
+ debug((" %02x", (unsigned char)pktin.data[5+st->i]));
+ debug(("\r\n"));
+#endif
+
+ free(newpayload);
+ }
+ }
+
pktin.savedpos = 6;
pktin.type = pktin.data[5];
crFinish(0);
}
-static void s_wrpkt_start(int type, int len) {
+static void ssh1_pktout_size(int len) {
int pad, biglen;
len += 5; /* type and CRC */
if (!pktout.data)
fatalbox("Out of memory");
}
+ pktout.body = pktout.data+4+pad+1;
+}
+static void s_wrpkt_start(int type, int len) {
+ ssh1_pktout_size(len);
pktout.type = type;
- pktout.body = pktout.data+4+pad+1;
}
static void s_wrpkt(void) {
int pad, len, biglen, i;
unsigned long crc;
+ pktout.body[-1] = pktout.type;
+
+ if (ssh1_compressing) {
+ unsigned char *compblk;
+ int complen;
+#if 0
+ debug(("Packet payload pre-compression:\n"));
+ for (i = -1; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.body[i]));
+ debug(("\r\n"));
+#endif
+ zlib_compress_block(pktout.body-1, pktout.length+1,
+ &compblk, &complen);
+ ssh1_pktout_size(complen-1);
+ memcpy(pktout.body-1, compblk, complen);
+ free(compblk);
+#if 0
+ debug(("Packet payload post-compression:\n"));
+ for (i = -1; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.body[i]));
+ debug(("\r\n"));
+#endif
+ }
+
len = pktout.length + 5; /* type and CRC */
pad = 8 - (len%8);
biglen = len + pad;
- pktout.body[-1] = pktout.type;
for (i=0; i<pad; i++)
pktout.data[i+4] = random_byte();
crc = crc32(pktout.data+4, biglen-4);
static unsigned long outgoing_sequence = 0;
/*
+ * Compress packet payload.
+ */
+#if 0
+ debug(("Pre-compression payload:\r\n"));
+ for (i = 5; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.data[i]));
+ debug(("\r\n"));
+#endif
+ {
+ unsigned char *newpayload;
+ int newlen;
+ if (cscomp && cscomp->compress(pktout.data+5, pktout.length-5,
+ &newpayload, &newlen)) {
+ pktout.length = 5;
+ ssh2_pkt_adddata(newpayload, newlen);
+ free(newpayload);
+ }
+ }
+
+ /*
* Add padding. At least four bytes, and must also bring total
* length (minus MAC) up to a multiple of the block size.
*/
break;
}
+ ssh_agentfwd_enabled = FALSE;
rdpkt2_state.incoming_sequence = 0;
*vsp = 0;
c_write("\r\n", 2);
username[strcspn(username, "\n\r")] = '\0';
} else {
- char stuff[200];
strncpy(username, cfg.username, 99);
username[99] = '\0';
- if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) {
- sprintf(stuff, "Sent username \"%s\".\r\n", username);
- c_write(stuff, strlen(stuff));
- }
}
send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END);
{
- char userlog[20+sizeof(username)];
+ char userlog[22+sizeof(username)];
sprintf(userlog, "Sent username \"%s\"", username);
logevent(userlog);
+ if (flags & FLAG_INTERACTIVE &&
+ (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) {
+ strcat(userlog, "\r\n");
+ c_write(userlog, strlen(userlog));
+ }
}
}
crReturnV;
} else if (pktin.type == SSH1_SMSG_FAILURE) {
logevent("Agent forwarding refused");
- } else
+ } else {
logevent("Agent forwarding enabled");
+ ssh_agentfwd_enabled = TRUE;
+ }
}
if (!cfg.nopty) {
logevent("Allocated pty");
}
+ if (cfg.compression) {
+ send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END);
+ do { crReturnV; } while (!ispkt);
+ if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) {
+ bombout(("Protocol confusion"));
+ crReturnV;
+ } else if (pktin.type == SSH1_SMSG_FAILURE) {
+ c_write("Server refused to compress\r\n", 32);
+ }
+ logevent("Started compression");
+ ssh1_compressing = TRUE;
+ zlib_compress_init();
+ zlib_decompress_init();
+ }
+
if (*cfg.remote_cmd)
send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END);
else
} else if (pktin.type == SSH1_SMSG_AGENT_OPEN) {
/* Remote side is trying to open a channel to talk to our
* agent. Give them back a local channel number. */
- unsigned i = 1;
+ unsigned i;
struct ssh_channel *c;
enum234 e;
- for (c = first234(ssh_channels, &e); c; c = next234(&e)) {
- if (c->localid > i)
- break; /* found a free number */
- i = c->localid + 1;
- }
- c = malloc(sizeof(struct ssh_channel));
- c->remoteid = GET_32BIT(pktin.body);
- c->localid = i;
- c->closes = 0;
- c->type = SSH1_SMSG_AGENT_OPEN; /* identify channel type */
- c->u.a.lensofar = 0;
- add234(ssh_channels, c);
- send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
- PKT_INT, c->remoteid, PKT_INT, c->localid,
- PKT_END);
- } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE ||
- pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) {
+
+ /* Refuse if agent forwarding is disabled. */
+ if (!ssh_agentfwd_enabled) {
+ send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE,
+ PKT_INT, GET_32BIT(pktin.body),
+ PKT_END);
+ } else {
+ i = 1;
+ for (c = first234(ssh_channels, &e); c; c = next234(&e)) {
+ if (c->localid > i)
+ break; /* found a free number */
+ i = c->localid + 1;
+ }
+ c = malloc(sizeof(struct ssh_channel));
+ c->remoteid = GET_32BIT(pktin.body);
+ c->localid = i;
+ c->closes = 0;
+ c->type = SSH1_SMSG_AGENT_OPEN;/* identify channel type */
+ c->u.a.lensofar = 0;
+ add234(ssh_channels, c);
+ send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
+ PKT_INT, c->remoteid, PKT_INT, c->localid,
+ PKT_END);
+ }
+ } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE ||
+ pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) {
/* Remote side closes a channel. */
unsigned i = GET_32BIT(pktin.body);
struct ssh_channel *c;
static const struct ssh_compress *sccomp_tobe = NULL;
static char *hostkeydata, *sigdata, *keystr, *fingerprint;
static int hostkeylen, siglen;
+ static void *hkey; /* actual host key */
static unsigned char exchange_hash[20];
static unsigned char keyspace[40];
static const struct ssh_cipher *preferred_cipher;
+ static const struct ssh_compress *preferred_comp;
crBegin;
random_init();
/*
- * Set up the preferred cipher.
+ * Set up the preferred cipher and compression.
*/
if (cfg.cipher == CIPHER_BLOWFISH) {
preferred_cipher = &ssh_blowfish_ssh2;
/* Shouldn't happen, but we do want to initialise to _something_. */
preferred_cipher = &ssh_3des_ssh2;
}
+ if (cfg.compression)
+ preferred_comp = &ssh_zlib;
+ else
+ preferred_comp = &ssh_comp_none;
/*
* Be prepared to work around the buggy MAC problem.
}
/* 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)
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ ssh2_pkt_addstring_str(c->name);
+ if (i < lenof(compressions))
ssh2_pkt_addstring_str(",");
}
/* List server->client 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)
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ ssh2_pkt_addstring_str(c->name);
+ if (i < lenof(compressions))
ssh2_pkt_addstring_str(",");
}
/* List client->server languages. Empty list. */
}
}
ssh2_pkt_getstring(&str, &len); /* client->server compression */
- for (i = 0; i < lenof(compressions); i++) {
- if (in_commasep_string(compressions[i]->name, str, len)) {
- cscomp_tobe = compressions[i];
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ if (in_commasep_string(c->name, str, len)) {
+ cscomp_tobe = c;
break;
}
}
ssh2_pkt_getstring(&str, &len); /* server->client compression */
- for (i = 0; i < lenof(compressions); i++) {
- if (in_commasep_string(compressions[i]->name, str, len)) {
- sccomp_tobe = compressions[i];
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ if (in_commasep_string(c->name, str, len)) {
+ sccomp_tobe = c;
break;
}
}
debug(("\r\n"));
#endif
- hostkey->setkey(hostkeydata, hostkeylen);
- if (!hostkey->verifysig(sigdata, siglen, exchange_hash, 20)) {
+ hkey = hostkey->newkey(hostkeydata, hostkeylen);
+ if (!hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) {
bombout(("Server failed host key check"));
crReturn(0);
}
* Authenticate remote host: verify host key. (We've already
* checked the signature of the exchange hash.)
*/
- keystr = hostkey->fmtkey();
- fingerprint = hostkey->fingerprint();
+ keystr = hostkey->fmtkey(hkey);
+ fingerprint = hostkey->fingerprint(hkey);
verify_ssh_host_key(savedhost, savedport, hostkey->keytype,
keystr, fingerprint);
logevent("Host key fingerprint is:");
logevent(fingerprint);
free(fingerprint);
free(keystr);
+ hostkey->freekey(hkey);
/*
* Send SSH2_MSG_NEWKEYS.
scmac = scmac_tobe;
cscomp = cscomp_tobe;
sccomp = sccomp_tobe;
+ cscomp->compress_init();
+ sccomp->decompress_init();
/*
* Set IVs after keys.
*/
* Called to send data down the Telnet connection.
*/
static void ssh_send (char *buf, int len) {
- if (s == NULL)
+ if (s == NULL || ssh_protocol == NULL)
return;
ssh_protocol(buf, len, 0);
projects / u / mdw / putty / blobdiff