if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \
fprintf(stderr, "%s\n", s); }
-#define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, sk_close(s), \
- s = NULL, connection_fatal msg )
+#define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, \
+ (s ? sk_close(s), s = NULL : 0), \
+ connection_fatal msg )
#define SSH1_MSG_DISCONNECT 1 /* 0x1 */
#define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */
#define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */
#define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */
#define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */
+#define SSH1_SMSG_X11_OPEN 27 /* 0x1b */
+#define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */
+#define SSH1_MSG_PORT_OPEN 29 /* 0x1d */
#define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */
#define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */
-#define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
#define SSH1_MSG_IGNORE 32 /* 0x20 */
+#define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */
+#define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */
+#define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */
#define SSH1_MSG_DEBUG 36 /* 0x24 */
#define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */
#define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */
#define SSH2_MSG_NEWKEYS 21 /* 0x15 */
#define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
#define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
+#define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */
+#define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */
+#define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */
+#define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */
#define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
#define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
#define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
#define crWaitUntilV(c) do { crReturnV; } while (!(c))
extern const struct ssh_cipher ssh_3des;
-extern const struct ssh_cipher ssh_3des_ssh2;
+extern const struct ssh2_ciphers ssh2_3des;
extern const struct ssh_cipher ssh_des;
+extern const struct ssh2_ciphers ssh2_aes;
extern const struct ssh_cipher ssh_blowfish_ssh1;
-extern const struct ssh_cipher ssh_blowfish_ssh2;
+extern const struct ssh2_ciphers ssh2_blowfish;
+
+extern char *x11_init (Socket *, char *, void *);
+extern void x11_close (Socket);
+extern void x11_send (Socket , char *, int);
+extern void x11_invent_auth(char *, int, char *, int);
/*
* Ciphers for SSH2. We miss out single-DES because it isn't
* SSH1. (3DES uses outer chaining; Blowfish has the opposite
* endianness and different-sized keys.)
*/
-const static struct ssh_cipher *ciphers[] = { &ssh_blowfish_ssh2, &ssh_3des_ssh2 };
+const static struct ssh2_ciphers *ciphers[] = {
+ &ssh2_aes,
+ &ssh2_blowfish,
+ &ssh2_3des,
+};
extern const struct ssh_kex ssh_diffiehellman;
-const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman };
+extern const struct ssh_kex ssh_diffiehellman_gex;
+const static struct ssh_kex *kex_algs[] = {
+#ifdef DO_DIFFIE_HELLMAN_GEX
+ &ssh_diffiehellman_gex,
+#endif
+ &ssh_diffiehellman };
extern const struct ssh_signkey ssh_dss;
const static struct ssh_signkey *hostkey_algs[] = { &ssh_dss };
const static struct ssh_compress *compressions[] = {
&ssh_zlib, &ssh_comp_none };
+enum { /* channel types */
+ CHAN_MAINSESSION,
+ CHAN_X11,
+ CHAN_AGENT,
+};
+
/*
* 2-3-4 tree storing channels.
*/
unsigned remoteid, localid;
int type;
int closes;
+ struct ssh2_data_channel {
+ unsigned char *outbuffer;
+ unsigned outbuflen, outbufsize;
+ unsigned remwindow, remmaxpkt;
+ } v2;
union {
struct ssh_agent_channel {
unsigned char *message;
unsigned char msglen[4];
int lensofar, totallen;
} a;
- struct ssh2_data_channel {
- unsigned char *outbuffer;
- unsigned outbuflen, outbufsize;
- unsigned remwindow, remmaxpkt;
- } v2;
+ struct ssh_x11_channel {
+ Socket s;
+ } x11;
} u;
};
static unsigned char session_key[32];
static int ssh1_compressing;
static int ssh_agentfwd_enabled;
+static int ssh_X11_fwd_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 ssh2_cipher *cscipher = NULL;
+static const struct ssh2_cipher *sccipher = NULL;
static const struct ssh_mac *csmac = NULL;
static const struct ssh_mac *scmac = NULL;
static const struct ssh_compress *cscomp = NULL;
static char *savedhost;
static int savedport;
static int ssh_send_ok;
+static int ssh_echoing, ssh_editing;
static tree234 *ssh_channels; /* indexed by local id */
static struct ssh_channel *mainchan; /* primary session channel */
static enum {
+ SSH_STATE_PREPACKET,
SSH_STATE_BEFORE_SIZE,
SSH_STATE_INTERMED,
SSH_STATE_SESSION,
SSH_STATE_CLOSED
-} ssh_state = SSH_STATE_BEFORE_SIZE;
+} ssh_state = SSH_STATE_PREPACKET;
-static int size_needed = FALSE;
+static int size_needed = FALSE, eof_needed = FALSE;
static struct Packet pktin = { 0, 0, NULL, NULL, 0 };
static struct Packet pktout = { 0, 0, NULL, NULL, 0 };
+static unsigned char *deferred_send_data = NULL;
+static int deferred_len = 0, deferred_size = 0;
static int ssh_version;
static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt);
static void ssh1_protocol(unsigned char *in, int inlen, int ispkt);
static void ssh2_protocol(unsigned char *in, int inlen, int ispkt);
static void ssh_size(void);
+static void ssh_special (Telnet_Special);
+static void ssh2_try_send(struct ssh_channel *c);
+static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len);
static int (*s_rdpkt)(unsigned char **data, int *datalen);
/*
- * Utility routine for putting an SSH-protocol `string' into a SHA
- * state.
+ * Utility routines for putting an SSH-protocol `string' and
+ * `uint32' into a SHA state.
*/
#include <stdio.h>
static void sha_string(SHA_State *s, void *str, int len) {
SHA_Bytes(s, str, len);
}
+static void sha_uint32(SHA_State *s, unsigned i) {
+ unsigned char intblk[4];
+ PUT_32BIT(intblk, i);
+ SHA_Bytes(s, intblk, 4);
+}
+
/*
* SSH2 packet construction functions.
*/
-static void ssh2_pkt_adddata(void *data, int len) {
- pktout.length += len;
- if (pktout.maxlen < pktout.length) {
- pktout.maxlen = pktout.length + 256;
+static void ssh2_pkt_ensure(int length) {
+ if (pktout.maxlen < length) {
+ pktout.maxlen = length + 256;
pktout.data = (pktout.data == NULL ? smalloc(pktout.maxlen+APIEXTRA) :
srealloc(pktout.data, pktout.maxlen+APIEXTRA));
if (!pktout.data)
fatalbox("Out of memory");
}
+}
+static void ssh2_pkt_adddata(void *data, int len) {
+ pktout.length += len;
+ ssh2_pkt_ensure(pktout.length);
memcpy(pktout.data+pktout.length-len, data, len);
}
static void ssh2_pkt_addbyte(unsigned char byte) {
}
static char *ssh2_mpint_fmt(Bignum b, int *len) {
unsigned char *p;
- int i, n = b[0];
- p = smalloc(n * 2 + 1);
+ int i, n = (ssh1_bignum_bitcount(b)+7)/8;
+ p = smalloc(n + 1);
if (!p)
fatalbox("out of memory");
p[0] = 0;
- for (i = 0; i < n; i++) {
- p[i*2+1] = (b[n-i] >> 8) & 0xFF;
- p[i*2+2] = (b[n-i] ) & 0xFF;
- }
+ for (i = 1; i <= n; i++)
+ p[i] = bignum_byte(b, n-i);
i = 0;
- while (p[i] == 0 && (p[i+1] & 0x80) == 0)
+ while (i <= n && p[i] == 0 && (p[i+1] & 0x80) == 0)
i++;
- memmove(p, p+i, n*2+1-i);
- *len = n*2+1-i;
+ memmove(p, p+i, n+1-i);
+ *len = n+1-i;
return p;
}
static void ssh2_pkt_addmp(Bignum b) {
ssh2_pkt_addstring_data(p, len);
sfree(p);
}
-static void ssh2_pkt_send(void) {
+
+/*
+ * Construct an SSH2 final-form packet: compress it, encrypt it,
+ * put the MAC on it. Final packet, ready to be sent, is stored in
+ * pktout.data. Total length is returned.
+ */
+static int ssh2_pkt_construct(void) {
int cipherblk, maclen, padding, i;
static unsigned long outgoing_sequence = 0;
* Add padding. At least four bytes, and must also bring total
* length (minus MAC) up to a multiple of the block size.
*/
- cipherblk = cipher ? cipher->blksize : 8; /* block size */
+ cipherblk = cscipher ? cscipher->blksize : 8; /* block size */
cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */
padding = 4;
padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk;
+ maclen = csmac ? csmac->len : 0;
+ ssh2_pkt_ensure(pktout.length + padding + maclen);
pktout.data[4] = padding;
for (i = 0; i < padding; i++)
pktout.data[pktout.length + i] = random_byte();
if (cscipher)
cscipher->encrypt(pktout.data, pktout.length + padding);
- maclen = csmac ? csmac->len : 0;
- sk_write(s, pktout.data, pktout.length + padding + maclen);
+ /* Ready-to-send packet starts at pktout.data. We return length. */
+ return pktout.length + padding + maclen;
+}
+
+/*
+ * Construct and send an SSH2 packet immediately.
+ */
+static void ssh2_pkt_send(void) {
+ int len = ssh2_pkt_construct();
+ sk_write(s, pktout.data, len);
+}
+
+/*
+ * Construct an SSH2 packet and add it to a deferred data block.
+ * Useful for sending multiple packets in a single sk_write() call,
+ * to prevent a traffic-analysing listener from being able to work
+ * out the length of any particular packet (such as the password
+ * packet).
+ *
+ * Note that because SSH2 sequence-numbers its packets, this can
+ * NOT be used as an m4-style `defer' allowing packets to be
+ * constructed in one order and sent in another.
+ */
+static void ssh2_pkt_defer(void) {
+ int len = ssh2_pkt_construct();
+ if (deferred_len + len > deferred_size) {
+ deferred_size = deferred_len + len + 128;
+ deferred_send_data = srealloc(deferred_send_data, deferred_size);
+ }
+ memcpy(deferred_send_data+deferred_len, pktout.data, len);
+ deferred_len += len;
+}
+
+/*
+ * Send the whole deferred data block constructed by
+ * ssh2_pkt_defer().
+ */
+static void ssh2_pkt_defersend(void) {
+ sk_write(s, deferred_send_data, deferred_len);
+ deferred_len = deferred_size = 0;
+ sfree(deferred_send_data);
+ deferred_send_data = NULL;
}
#if 0
}
static Bignum ssh2_pkt_getmp(void) {
char *p;
- int i, j, length;
+ int length;
Bignum b;
ssh2_pkt_getstring(&p, &length);
bombout(("internal error: Can't handle negative mpints"));
return NULL;
}
- b = newbn((length+1)/2);
- for (i = 0; i < length; i++) {
- j = length - 1 - i;
- if (j & 1)
- b[j/2+1] |= ((unsigned char)p[i]) << 8;
- else
- b[j/2+1] |= ((unsigned char)p[i]);
- }
- while (b[0] > 1 && b[b[0]] == 0) b[0]--;
+ b = bignum_from_bytes(p, length);
return b;
}
ssh_version = 1;
s_rdpkt = ssh1_rdpkt;
}
+ ssh_state = SSH_STATE_BEFORE_SIZE;
crFinish(0);
}
}
static int ssh_receive(Socket skt, int urgent, char *data, int len) {
- if (!len) {
+ if (urgent==3) {
+ /* A socket error has occurred. */
+ ssh_state = SSH_STATE_CLOSED;
+ sk_close(s);
+ s = NULL;
+ connection_fatal(data);
+ return 0;
+ } else if (!len) {
/* Connection has closed. */
ssh_state = SSH_STATE_CLOSED;
sk_close(s);
/*
* Open socket.
*/
- s = sk_new(addr, port, ssh_receive);
+ s = sk_new(addr, port, 0, 1, ssh_receive);
if ( (err = sk_socket_error(s)) )
return err;
logevent("Encrypted session key");
- cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH :
- cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES :
- SSH_CIPHER_3DES;
+ switch (cfg.cipher) {
+ case CIPHER_BLOWFISH: cipher_type = SSH_CIPHER_BLOWFISH; break;
+ case CIPHER_DES: cipher_type = SSH_CIPHER_DES; break;
+ case CIPHER_3DES: cipher_type = SSH_CIPHER_3DES; break;
+ case CIPHER_AES:
+ c_write("AES not supported in SSH1, falling back to 3DES\r\n", 49);
+ cipher_type = SSH_CIPHER_3DES;
+ break;
+ }
if ((supported_ciphers_mask & (1 << cipher_type)) == 0) {
c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
cipher_type = SSH_CIPHER_3DES;
response = rsadecrypt(challenge, &pubkey);
freebn(pubkey.private_exponent); /* burn the evidence */
- for (i = 0; i < 32; i += 2) {
- buffer[i] = response[16-i/2] >> 8;
- buffer[i+1] = response[16-i/2] & 0xFF;
+ for (i = 0; i < 32; i++) {
+ buffer[i] = bignum_byte(response, 31-i);
}
MD5Init(&md5c);
crFinish(1);
}
+void sshfwd_close(struct ssh_channel *c) {
+ if (c) {
+ if (ssh_version == 1) {
+ send_packet(SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, PKT_END);
+ } else {
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_send();
+ }
+ c->closes = 1;
+ if (c->type == CHAN_X11) {
+ c->u.x11.s = NULL;
+ logevent("X11 connection terminated");
+ }
+ }
+}
+
+void sshfwd_write(struct ssh_channel *c, char *buf, int len) {
+ if (ssh_version == 1) {
+ send_packet(SSH1_MSG_CHANNEL_DATA,
+ PKT_INT, c->remoteid,
+ PKT_INT, len,
+ PKT_DATA, buf, len,
+ PKT_END);
+ } else {
+ ssh2_add_channel_data(c, buf, len);
+ ssh2_try_send(c);
+ }
+}
+
static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) {
crBegin;
}
}
+ if (cfg.x11_forward) {
+ char proto[20], data[64];
+ logevent("Requesting X11 forwarding");
+ x11_invent_auth(proto, sizeof(proto), data, sizeof(data));
+ send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING,
+ PKT_STR, proto, PKT_STR, data,
+ PKT_INT, 0,
+ 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) {
+ logevent("X11 forwarding refused");
+ } else {
+ logevent("X11 forwarding enabled");
+ ssh_X11_fwd_enabled = TRUE;
+ }
+ }
+
if (!cfg.nopty) {
send_packet(SSH1_CMSG_REQUEST_PTY,
PKT_STR, cfg.termtype,
crReturnV;
} else if (pktin.type == SSH1_SMSG_FAILURE) {
c_write("Server refused to allocate pty\r\n", 32);
+ ssh_editing = ssh_echoing = 1;
}
logevent("Allocated pty");
+ } else {
+ ssh_editing = ssh_echoing = 1;
}
if (cfg.compression) {
ssh_state = SSH_STATE_SESSION;
if (size_needed)
ssh_size();
+ if (eof_needed)
+ ssh_special(TS_EOF);
+ ldisc_send(NULL, 0); /* cause ldisc to notice changes */
ssh_send_ok = 1;
ssh_channels = newtree234(ssh_channelcmp);
- begin_session();
while (1) {
crReturnV;
if (ispkt) {
ssh_state = SSH_STATE_CLOSED;
logevent("Received disconnect request");
crReturnV;
+ } else if (pktin.type == SSH1_SMSG_X11_OPEN) {
+ /* Remote side is trying to open a channel to talk to our
+ * X-Server. Give them back a local channel number. */
+ unsigned i;
+ struct ssh_channel *c, *d;
+ enum234 e;
+
+ logevent("Received X11 connect request");
+ /* Refuse if X11 forwarding is disabled. */
+ if (!ssh_X11_fwd_enabled) {
+ send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE,
+ PKT_INT, GET_32BIT(pktin.body),
+ PKT_END);
+ logevent("Rejected X11 connect request");
+ } else {
+ c = smalloc(sizeof(struct ssh_channel));
+
+ if ( x11_init(&c->u.x11.s, cfg.x11_display, c) != NULL ) {
+ logevent("opening X11 forward connection failed");
+ sfree(c);
+ send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE,
+ PKT_INT, GET_32BIT(pktin.body),
+ PKT_END);
+ } else {
+ logevent("opening X11 forward connection succeeded");
+ for (i=1, d = first234(ssh_channels, &e); d; d = next234(&e)) {
+ if (d->localid > i)
+ break; /* found a free number */
+ i = d->localid + 1;
+ }
+ c->remoteid = GET_32BIT(pktin.body);
+ c->localid = i;
+ c->closes = 0;
+ c->type = CHAN_X11; /* identify channel type */
+ add234(ssh_channels, c);
+ send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
+ PKT_INT, c->remoteid, PKT_INT, c->localid,
+ PKT_END);
+ logevent("Opened X11 forward channel");
+ }
+ }
} 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. */
c->remoteid = GET_32BIT(pktin.body);
c->localid = i;
c->closes = 0;
- c->type = SSH1_SMSG_AGENT_OPEN;/* identify channel type */
+ c->type = CHAN_AGENT; /* identify channel type */
c->u.a.lensofar = 0;
add234(ssh_channels, c);
send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
int closetype;
closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2);
send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END);
+ if ((c->closes == 0) && (c->type == CHAN_X11)) {
+ logevent("X11 connection closed");
+ assert(c->u.x11.s != NULL);
+ x11_close(c->u.x11.s);
+ c->u.x11.s = NULL;
+ }
c->closes |= closetype;
if (c->closes == 3) {
del234(ssh_channels, c);
c = find234(ssh_channels, &i, ssh_channelfind);
if (c) {
switch(c->type) {
- case SSH1_SMSG_AGENT_OPEN:
+ case CHAN_X11:
+ x11_send(c->u.x11.s, p, len);
+ break;
+ case CHAN_AGENT:
/* Data for an agent message. Buffer it. */
while (len > 0) {
if (c->u.a.lensofar < 4) {
/*
* SSH2 key creation method.
*/
-static void ssh2_mkkey(Bignum K, char *H, char chr, char *keyspace) {
+static void ssh2_mkkey(Bignum K, char *H, char *sessid, char chr, char *keyspace) {
SHA_State s;
/* First 20 bytes. */
SHA_Init(&s);
sha_mpint(&s, K);
SHA_Bytes(&s, H, 20);
SHA_Bytes(&s, &chr, 1);
- SHA_Bytes(&s, H, 20);
+ SHA_Bytes(&s, sessid, 20);
SHA_Final(&s, keyspace);
/* Next 20 bytes. */
SHA_Init(&s);
*/
static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt)
{
- static int i, len;
+ static int i, j, len, nbits;
static char *str;
- static Bignum e, f, K;
+ static Bignum p, g, e, f, K;
+ static int kex_init_value, kex_reply_value;
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 ssh2_cipher *cscipher_tobe = NULL;
+ static const struct ssh2_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 int hostkeylen, siglen;
static void *hkey; /* actual host key */
static unsigned char exchange_hash[20];
+ static unsigned char first_exchange_hash[20];
static unsigned char keyspace[40];
- static const struct ssh_cipher *preferred_cipher;
+ static const struct ssh2_ciphers *preferred_cipher;
static const struct ssh_compress *preferred_comp;
static int first_kex;
* Set up the preferred cipher and compression.
*/
if (cfg.cipher == CIPHER_BLOWFISH) {
- preferred_cipher = &ssh_blowfish_ssh2;
+ preferred_cipher = &ssh2_blowfish;
} else if (cfg.cipher == CIPHER_DES) {
logevent("Single DES not supported in SSH2; using 3DES");
- preferred_cipher = &ssh_3des_ssh2;
+ preferred_cipher = &ssh2_3des;
} else if (cfg.cipher == CIPHER_3DES) {
- preferred_cipher = &ssh_3des_ssh2;
+ preferred_cipher = &ssh2_3des;
+ } else if (cfg.cipher == CIPHER_AES) {
+ preferred_cipher = &ssh2_aes;
} else {
/* Shouldn't happen, but we do want to initialise to _something_. */
- preferred_cipher = &ssh_3des_ssh2;
+ preferred_cipher = &ssh2_3des;
}
if (cfg.compression)
preferred_comp = &ssh_zlib;
/* List client->server encryption algorithms. */
ssh2_pkt_addstring_start();
for (i = 0; i < lenof(ciphers)+1; i++) {
- 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(",");
+ const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1];
+ for (j = 0; j < c->nciphers; j++) {
+ ssh2_pkt_addstring_str(c->list[j]->name);
+ if (i < lenof(ciphers) || j < c->nciphers-1)
+ ssh2_pkt_addstring_str(",");
+ }
}
/* List server->client encryption algorithms. */
ssh2_pkt_addstring_start();
for (i = 0; i < lenof(ciphers)+1; i++) {
- 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(",");
+ const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1];
+ for (j = 0; j < c->nciphers; j++) {
+ ssh2_pkt_addstring_str(c->list[j]->name);
+ if (i < lenof(ciphers) || j < c->nciphers-1)
+ ssh2_pkt_addstring_str(",");
+ }
}
/* List client->server MAC algorithms. */
ssh2_pkt_addstring_start();
}
ssh2_pkt_getstring(&str, &len); /* client->server cipher */
for (i = 0; i < lenof(ciphers)+1; i++) {
- const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1];
- if (in_commasep_string(c->name, str, len)) {
- cscipher_tobe = c;
- break;
+ const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1];
+ for (j = 0; j < c->nciphers; j++) {
+ if (in_commasep_string(c->list[j]->name, str, len)) {
+ cscipher_tobe = c->list[j];
+ break;
+ }
}
+ if (cscipher_tobe)
+ break;
}
ssh2_pkt_getstring(&str, &len); /* server->client cipher */
for (i = 0; i < lenof(ciphers)+1; i++) {
- const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1];
- if (in_commasep_string(c->name, str, len)) {
- sccipher_tobe = c;
- break;
+ const struct ssh2_ciphers *c = i==0 ? preferred_cipher : ciphers[i-1];
+ for (j = 0; j < c->nciphers; j++) {
+ if (in_commasep_string(c->list[j]->name, str, len)) {
+ sccipher_tobe = c->list[j];
+ break;
+ }
}
+ if (sccipher_tobe)
+ break;
}
ssh2_pkt_getstring(&str, &len); /* client->server mac */
for (i = 0; i < nmacs; i++) {
}
/*
- * Currently we only support Diffie-Hellman and DSS, so let's
- * bomb out if those aren't selected.
+ * If we're doing Diffie-Hellman group exchange, start by
+ * requesting a group.
*/
- if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) {
- bombout(("internal fault: chaos in SSH 2 transport layer"));
- crReturn(0);
+ if (kex == &ssh_diffiehellman_gex) {
+ int csbits, scbits;
+
+ logevent("Doing Diffie-Hellman group exchange");
+ /*
+ * Work out number of bits. We start with the maximum key
+ * length of either cipher...
+ */
+ csbits = cscipher_tobe->keylen;
+ scbits = sccipher_tobe->keylen;
+ nbits = (csbits > scbits ? csbits : scbits);
+ /* The keys only have 160-bit entropy, since they're based on
+ * a SHA-1 hash. So cap the key size at 160 bits. */
+ if (nbits > 160) nbits = 160;
+ /*
+ * ... and then work out how big a DH group we will need to
+ * allow that much data.
+ */
+ nbits = 512 << ((nbits-1) / 64);
+ ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST);
+ ssh2_pkt_adduint32(nbits);
+ ssh2_pkt_send();
+
+ crWaitUntil(ispkt);
+ if (pktin.type != SSH2_MSG_KEX_DH_GEX_GROUP) {
+ bombout(("expected key exchange group packet from server"));
+ crReturn(0);
+ }
+ p = ssh2_pkt_getmp();
+ g = ssh2_pkt_getmp();
+ dh_setup_group(p, g);
+ kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT;
+ kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY;
+ } else {
+ dh_setup_group1();
+ kex_init_value = SSH2_MSG_KEXDH_INIT;
+ kex_reply_value = SSH2_MSG_KEXDH_REPLY;
}
+ logevent("Doing Diffie-Hellman key exchange");
/*
- * Now we begin the fun. Generate and send e for Diffie-Hellman.
+ * Now generate and send e for Diffie-Hellman.
*/
e = dh_create_e();
- ssh2_pkt_init(SSH2_MSG_KEXDH_INIT);
+ ssh2_pkt_init(kex_init_value);
ssh2_pkt_addmp(e);
ssh2_pkt_send();
crWaitUntil(ispkt);
- if (pktin.type != SSH2_MSG_KEXDH_REPLY) {
- bombout(("expected key exchange packet from server"));
+ if (pktin.type != kex_reply_value) {
+ bombout(("expected key exchange reply packet from server"));
crReturn(0);
}
ssh2_pkt_getstring(&hostkeydata, &hostkeylen);
K = dh_find_K(f);
sha_string(&exhash, hostkeydata, hostkeylen);
+ if (kex == &ssh_diffiehellman_gex) {
+ sha_uint32(&exhash, nbits);
+ sha_mpint(&exhash, p);
+ sha_mpint(&exhash, g);
+ }
sha_mpint(&exhash, e);
sha_mpint(&exhash, f);
sha_mpint(&exhash, K);
SHA_Final(&exhash, exchange_hash);
+ dh_cleanup();
+
#if 0
debug(("Exchange hash is:\r\n"));
for (i = 0; i < 20; i++)
fingerprint = hostkey->fingerprint(hkey);
verify_ssh_host_key(savedhost, savedport, hostkey->keytype,
keystr, fingerprint);
- logevent("Host key fingerprint is:");
- logevent(fingerprint);
+ if (first_kex) { /* don't bother logging this in rekeys */
+ logevent("Host key fingerprint is:");
+ logevent(fingerprint);
+ }
sfree(fingerprint);
sfree(keystr);
hostkey->freekey(hkey);
cscomp->compress_init();
sccomp->decompress_init();
/*
- * Set IVs after keys.
+ * Set IVs after keys. Here we use the exchange hash from the
+ * _first_ key exchange.
*/
- ssh2_mkkey(K, exchange_hash, 'C', keyspace); cscipher->setcskey(keyspace);
- ssh2_mkkey(K, exchange_hash, 'D', keyspace); cscipher->setsckey(keyspace);
- ssh2_mkkey(K, exchange_hash, 'A', keyspace); cscipher->setcsiv(keyspace);
- ssh2_mkkey(K, exchange_hash, 'B', keyspace); sccipher->setsciv(keyspace);
- ssh2_mkkey(K, exchange_hash, 'E', keyspace); csmac->setcskey(keyspace);
- ssh2_mkkey(K, exchange_hash, 'F', keyspace); scmac->setsckey(keyspace);
+ if (first_kex)
+ memcpy(first_exchange_hash, exchange_hash, sizeof(exchange_hash));
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'C', keyspace);
+ cscipher->setcskey(keyspace);
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'D', keyspace);
+ sccipher->setsckey(keyspace);
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'A', keyspace);
+ cscipher->setcsiv(keyspace);
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'B', keyspace);
+ sccipher->setsciv(keyspace);
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'E', keyspace);
+ csmac->setcskey(keyspace);
+ ssh2_mkkey(K, exchange_hash, first_exchange_hash, 'F', keyspace);
+ scmac->setsckey(keyspace);
/*
* If this is the first key exchange phase, we must pass the
* transport. If we ever see a KEXINIT, we must go back to the
* start.
*/
- do {
+ while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)) {
crReturn(1);
- } while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT));
+ }
+ logevent("Server initiated key re-exchange");
goto begin_key_exchange;
crFinish(1);
}
/*
+ * Add data to an SSH2 channel output buffer.
+ */
+static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len) {
+ if (c->v2.outbufsize <
+ c->v2.outbuflen + len) {
+ c->v2.outbufsize =
+ c->v2.outbuflen + len + 1024;
+ c->v2.outbuffer = srealloc(c->v2.outbuffer,
+ c->v2.outbufsize);
+ }
+ memcpy(c->v2.outbuffer + c->v2.outbuflen,
+ buf, len);
+ c->v2.outbuflen += len;
+}
+
+/*
+ * Attempt to send data on an SSH2 channel.
+ */
+static void ssh2_try_send(struct ssh_channel *c) {
+ while (c->v2.remwindow > 0 &&
+ c->v2.outbuflen > 0) {
+ unsigned len = c->v2.remwindow;
+ if (len > c->v2.outbuflen)
+ len = c->v2.outbuflen;
+ if (len > c->v2.remmaxpkt)
+ len = c->v2.remmaxpkt;
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_addstring_start();
+ ssh2_pkt_addstring_data(c->v2.outbuffer, len);
+ ssh2_pkt_send();
+ c->v2.outbuflen -= len;
+ memmove(c->v2.outbuffer, c->v2.outbuffer+len,
+ c->v2.outbuflen);
+ c->v2.remwindow -= len;
+ }
+}
+
+/*
* Handle the SSH2 userauth and connection layers.
*/
static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt)
c_write("\r\n", 2);
}
+ /*
+ * We send the password packet lumped tightly together with
+ * an SSH_MSG_IGNORE packet. The IGNORE packet contains a
+ * string long enough to make the total length of the two
+ * packets constant. This should ensure that a passive
+ * listener doing traffic analyis can't work out the length
+ * of the password.
+ *
+ * For this to work, we need an assumption about the
+ * maximum length of the password packet. I think 256 is
+ * pretty conservative. Anyone using a password longer than
+ * that probably doesn't have much to worry about from
+ * people who find out how long their password is!
+ */
ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
ssh2_pkt_addstring(username);
ssh2_pkt_addstring("ssh-connection"); /* service requested */
ssh2_pkt_addstring("password");
ssh2_pkt_addbool(FALSE);
ssh2_pkt_addstring(password);
- ssh2_pkt_send();
+ ssh2_pkt_defer();
+ /*
+ * We'll include a string that's an exact multiple of the
+ * cipher block size. If the cipher is NULL for some
+ * reason, we don't do this trick at all because we gain
+ * nothing by it.
+ */
+ if (cscipher) {
+ int i, j;
+ ssh2_pkt_init(SSH2_MSG_IGNORE);
+ ssh2_pkt_addstring_start();
+ for (i = deferred_len; i <= 256; i += cscipher->blksize) {
+ for (j = 0; j < cscipher->blksize; j++) {
+ char c = (char)random_byte();
+ ssh2_pkt_addstring_data(&c, 1);
+ }
+ }
+ ssh2_pkt_defer();
+ }
+ ssh2_pkt_defersend();
crWaitUntilV(ispkt);
if (pktin.type != SSH2_MSG_USERAUTH_SUCCESS) {
crReturnV;
}
mainchan->remoteid = ssh2_pkt_getuint32();
- mainchan->u.v2.remwindow = ssh2_pkt_getuint32();
- mainchan->u.v2.remmaxpkt = ssh2_pkt_getuint32();
- mainchan->u.v2.outbuffer = NULL;
- mainchan->u.v2.outbuflen = mainchan->u.v2.outbufsize = 0;
+ mainchan->type = CHAN_MAINSESSION;
+ mainchan->closes = 0;
+ mainchan->v2.remwindow = ssh2_pkt_getuint32();
+ mainchan->v2.remmaxpkt = ssh2_pkt_getuint32();
+ mainchan->v2.outbuffer = NULL;
+ mainchan->v2.outbuflen = mainchan->v2.outbufsize = 0;
+ ssh_channels = newtree234(ssh_channelcmp);
+ add234(ssh_channels, mainchan);
logevent("Opened channel for session");
/*
+ * Potentially enable X11 forwarding.
+ */
+ if (cfg.x11_forward) {
+ char proto[20], data[64];
+ logevent("Requesting X11 forwarding");
+ x11_invent_auth(proto, sizeof(proto), data, sizeof(data));
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
+ ssh2_pkt_adduint32(mainchan->remoteid);
+ ssh2_pkt_addstring("x11-req");
+ ssh2_pkt_addbool(1); /* want reply */
+ ssh2_pkt_addbool(0); /* many connections */
+ ssh2_pkt_addstring(proto);
+ ssh2_pkt_addstring(data);
+ ssh2_pkt_adduint32(0); /* screen number */
+ ssh2_pkt_send();
+
+ do {
+ crWaitUntilV(ispkt);
+ if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) {
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+ c->v2.remwindow += ssh2_pkt_getuint32();
+ }
+ } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+
+ if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) {
+ if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) {
+ bombout(("Server got confused by X11 forwarding request"));
+ crReturnV;
+ }
+ logevent("X11 forwarding refused");
+ } else {
+ logevent("X11 forwarding enabled");
+ ssh_X11_fwd_enabled = TRUE;
+ }
+ }
+
+ /*
* Now allocate a pty for the session.
*/
if (!cfg.nopty) {
do {
crWaitUntilV(ispkt);
if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) {
- /* FIXME: be able to handle other channels here */
- if (ssh2_pkt_getuint32() != mainchan->localid)
- continue; /* wrong channel */
- mainchan->u.v2.remwindow += ssh2_pkt_getuint32();
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+ c->v2.remwindow += ssh2_pkt_getuint32();
}
} while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST);
crReturnV;
}
c_write("Server refused to allocate pty\r\n", 32);
+ ssh_editing = ssh_echoing = 1;
} else {
logevent("Allocated pty");
}
+ } else {
+ ssh_editing = ssh_echoing = 1;
}
/*
*/
ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */
- if (*cfg.remote_cmd) {
+ if (cfg.ssh_subsys) {
+ ssh2_pkt_addstring("subsystem");
+ ssh2_pkt_addbool(1); /* want reply */
+ ssh2_pkt_addstring(cfg.remote_cmd);
+ } else if (*cfg.remote_cmd) {
ssh2_pkt_addstring("exec");
ssh2_pkt_addbool(1); /* want reply */
ssh2_pkt_addstring(cfg.remote_cmd);
do {
crWaitUntilV(ispkt);
if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) {
- /* FIXME: be able to handle other channels here */
- if (ssh2_pkt_getuint32() != mainchan->localid)
- continue; /* wrong channel */
- mainchan->u.v2.remwindow += ssh2_pkt_getuint32();
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+ c->v2.remwindow += ssh2_pkt_getuint32();
}
} while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST);
if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) {
ssh_state = SSH_STATE_SESSION;
if (size_needed)
ssh_size();
+ if (eof_needed)
+ ssh_special(TS_EOF);
/*
* Transfer data!
*/
+ ldisc_send(NULL, 0); /* cause ldisc to notice changes */
ssh_send_ok = 1;
- begin_session();
while (1) {
static int try_send;
crReturnV;
pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) {
char *data;
int length;
- /* FIXME: be able to handle other channels here */
- if (ssh2_pkt_getuint32() != mainchan->localid)
- continue; /* wrong channel */
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA &&
ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR)
continue; /* extended but not stderr */
ssh2_pkt_getstring(&data, &length);
if (data) {
- from_backend(pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA,
- data, length);
+ switch (c->type) {
+ case CHAN_MAINSESSION:
+ from_backend(pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA,
+ data, length);
+ break;
+ case CHAN_X11:
+ x11_send(c->u.x11.s, data, length);
+ break;
+ }
/*
- * Enlarge the window again at the remote side,
- * just in case it ever runs down and they fail
- * to send us any more data.
+ * Enlarge the window again at the remote
+ * side, just in case it ever runs down and
+ * they fail to send us any more data.
*/
ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
- ssh2_pkt_adduint32(mainchan->remoteid);
+ ssh2_pkt_adduint32(c->remoteid);
ssh2_pkt_adduint32(length);
ssh2_pkt_send();
}
} else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) {
continue; /* exit status et al; ignore (FIXME?) */
} else if (pktin.type == SSH2_MSG_CHANNEL_EOF) {
- continue; /* remote sends EOF; ignore */
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+
+ if (c->type == CHAN_X11) {
+ /*
+ * Remote EOF on an X11 channel means we should
+ * wrap up and close the channel ourselves.
+ */
+ x11_close(c->u.x11.s);
+ sshfwd_close(c);
+ }
} else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) {
- /* FIXME: be able to handle other channels here */
- if (ssh2_pkt_getuint32() != mainchan->localid)
- continue; /* wrong channel */
- ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE);
- ssh2_pkt_adduint32(mainchan->remoteid);
- ssh2_pkt_send();
- /* FIXME: mark the channel as closed */
- if (1 /* FIXME: "all channels are closed" */) {
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ enum234 e;
+
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+ if (c->closes == 0) {
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_send();
+ }
+ /* Do pre-close processing on the channel. */
+ switch (c->type) {
+ case CHAN_MAINSESSION:
+ break; /* nothing to see here, move along */
+ case CHAN_X11:
+ break;
+ }
+ del234(ssh_channels, c);
+ sfree(c->v2.outbuffer);
+ sfree(c);
+
+ /*
+ * See if that was the last channel left open.
+ */
+ c = first234(ssh_channels, &e);
+ if (!c) {
logevent("All channels closed. Disconnecting");
ssh2_pkt_init(SSH2_MSG_DISCONNECT);
ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION);
}
continue; /* remote sends close; ignore (FIXME) */
} else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) {
- /* FIXME: be able to handle other channels here */
- if (ssh2_pkt_getuint32() != mainchan->localid)
- continue; /* wrong channel */
- mainchan->u.v2.remwindow += ssh2_pkt_getuint32();
+ unsigned i = ssh2_pkt_getuint32();
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (!c)
+ continue; /* nonexistent channel */
+ mainchan->v2.remwindow += ssh2_pkt_getuint32();
try_send = TRUE;
+ } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN) {
+ char *type;
+ int typelen;
+ char *error = NULL;
+ struct ssh_channel *c;
+ ssh2_pkt_getstring(&type, &typelen);
+ c = smalloc(sizeof(struct ssh_channel));
+
+ if (typelen == 3 && !memcmp(type, "x11", 3)) {
+ if (!ssh_X11_fwd_enabled)
+ error = "X11 forwarding is not enabled";
+ else if ( x11_init(&c->u.x11.s, cfg.x11_display, c) != NULL ) {
+ error = "Unable to open an X11 connection";
+ } else {
+ c->type = CHAN_X11;
+ }
+ } else {
+ error = "Unsupported channel type requested";
+ }
+
+ c->remoteid = ssh2_pkt_getuint32();
+ if (error) {
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_adduint32(SSH2_OPEN_CONNECT_FAILED);
+ ssh2_pkt_addstring(error);
+ ssh2_pkt_addstring("en"); /* language tag */
+ ssh2_pkt_send();
+ sfree(c);
+ } else {
+ struct ssh_channel *d;
+ unsigned i;
+ enum234 e;
+
+ for (i=1, d = first234(ssh_channels, &e); d;
+ d = next234(&e)) {
+ if (d->localid > i)
+ break; /* found a free number */
+ i = d->localid + 1;
+ }
+ c->localid = i;
+ c->closes = 0;
+ c->v2.remwindow = ssh2_pkt_getuint32();
+ c->v2.remmaxpkt = ssh2_pkt_getuint32();
+ c->v2.outbuffer = NULL;
+ c->v2.outbuflen = c->v2.outbufsize = 0;
+ add234(ssh_channels, c);
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_adduint32(c->localid);
+ ssh2_pkt_adduint32(0x8000UL); /* our window size */
+ ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */
+ ssh2_pkt_send();
+ }
} else {
bombout(("Strange packet received: type %d", pktin.type));
crReturnV;
/*
* We have spare data. Add it to the channel buffer.
*/
- if (mainchan->u.v2.outbufsize <
- mainchan->u.v2.outbuflen + inlen) {
- mainchan->u.v2.outbufsize =
- mainchan->u.v2.outbuflen + inlen + 1024;
- mainchan->u.v2.outbuffer = srealloc(mainchan->u.v2.outbuffer,
- mainchan->u.v2.outbufsize);
- }
- memcpy(mainchan->u.v2.outbuffer + mainchan->u.v2.outbuflen,
- in, inlen);
- mainchan->u.v2.outbuflen += inlen;
+ ssh2_add_channel_data(mainchan, in, inlen);
try_send = TRUE;
}
if (try_send) {
+ enum234 e;
+ struct ssh_channel *c;
/*
- * Try to send data on the channel if we can. (FIXME:
- * on _all_ channels.)
+ * Try to send data on all channels if we can.
*/
- while (mainchan->u.v2.remwindow > 0 &&
- mainchan->u.v2.outbuflen > 0) {
- unsigned len = mainchan->u.v2.remwindow;
- if (len > mainchan->u.v2.outbuflen)
- len = mainchan->u.v2.outbuflen;
- if (len > mainchan->u.v2.remmaxpkt)
- len = mainchan->u.v2.remmaxpkt;
- ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA);
- ssh2_pkt_adduint32(mainchan->remoteid);
- ssh2_pkt_addstring_start();
- ssh2_pkt_addstring_data(mainchan->u.v2.outbuffer, len);
- ssh2_pkt_send();
- mainchan->u.v2.outbuflen -= len;
- memmove(mainchan->u.v2.outbuffer, mainchan->u.v2.outbuffer+len,
- mainchan->u.v2.outbuflen);
- mainchan->u.v2.remwindow -= len;
- }
+ for (c = first234(ssh_channels, &e); c; c = next234(&e))
+ ssh2_try_send(c);
}
}
#endif
ssh_send_ok = 0;
+ ssh_editing = 0;
+ ssh_echoing = 0;
p = connect_to_host(host, port, realhost);
if (p != NULL)
static void ssh_size(void) {
switch (ssh_state) {
case SSH_STATE_BEFORE_SIZE:
+ case SSH_STATE_PREPACKET:
case SSH_STATE_CLOSED:
break; /* do nothing */
case SSH_STATE_INTERMED:
ssh2_pkt_send();
}
}
+ break;
}
}
*/
static void ssh_special (Telnet_Special code) {
if (code == TS_EOF) {
+ if (ssh_state != SSH_STATE_SESSION) {
+ /*
+ * Buffer the EOF in case we are pre-SESSION, so we can
+ * send it as soon as we reach SESSION.
+ */
+ if (code == TS_EOF)
+ eof_needed = TRUE;
+ return;
+ }
if (ssh_version == 1) {
send_packet(SSH1_CMSG_EOF, PKT_END);
} else {
}
logevent("Sent EOF message");
} else if (code == TS_PING) {
+ if (ssh_state == SSH_STATE_CLOSED || ssh_state == SSH_STATE_PREPACKET)
+ return;
if (ssh_version == 1) {
send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END);
} else {
static int ssh_sendok(void) { return ssh_send_ok; }
+static int ssh_ldisc(int option) {
+ if (option == LD_ECHO) return ssh_echoing;
+ if (option == LD_EDIT) return ssh_editing;
+ return FALSE;
+}
+
Backend ssh_backend = {
ssh_init,
ssh_send,
ssh_special,
ssh_socket,
ssh_sendok,
+ ssh_ldisc,
22
};
projects / u / mdw / putty / blobdiff