#include <stdarg.h>
#include <assert.h>
#include <limits.h>
+#include <signal.h>
#include "putty.h"
#include "tree234.h"
#include "ssh.h"
+#ifndef NO_GSSAPI
+#include "sshgssc.h"
+#include "sshgss.h"
+#endif
#ifndef FALSE
#define FALSE 0
#define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
#define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
+#define SSH1_AUTH_RHOSTS 1 /* 0x1 */
+#define SSH1_AUTH_RSA 2 /* 0x2 */
+#define SSH1_AUTH_PASSWORD 3 /* 0x3 */
+#define SSH1_AUTH_RHOSTS_RSA 4 /* 0x4 */
#define SSH1_AUTH_TIS 5 /* 0x5 */
#define SSH1_AUTH_CCARD 16 /* 0x10 */
#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_KEXRSA_PUBKEY 30 /* 0x1e */
+#define SSH2_MSG_KEXRSA_SECRET 31 /* 0x1f */
+#define SSH2_MSG_KEXRSA_DONE 32 /* 0x20 */
#define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
#define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
#define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
#define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
#define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
#define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
+#define SSH2_MSG_USERAUTH_GSSAPI_RESPONSE 60
+#define SSH2_MSG_USERAUTH_GSSAPI_TOKEN 61
+#define SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE 63
+#define SSH2_MSG_USERAUTH_GSSAPI_ERROR 64
+#define SSH2_MSG_USERAUTH_GSSAPI_ERRTOK 65
+#define SSH2_MSG_USERAUTH_GSSAPI_MIC 66
/*
* Packet type contexts, so that ssh2_pkt_type can correctly decode
* the ambiguous type numbers back into the correct type strings.
*/
-#define SSH2_PKTCTX_DHGROUP 0x0001
-#define SSH2_PKTCTX_DHGEX 0x0002
-#define SSH2_PKTCTX_KEX_MASK 0x000F
-#define SSH2_PKTCTX_PUBLICKEY 0x0010
-#define SSH2_PKTCTX_PASSWORD 0x0020
-#define SSH2_PKTCTX_KBDINTER 0x0040
-#define SSH2_PKTCTX_AUTH_MASK 0x00F0
+typedef enum {
+ SSH2_PKTCTX_NOKEX,
+ SSH2_PKTCTX_DHGROUP,
+ SSH2_PKTCTX_DHGEX,
+ SSH2_PKTCTX_RSAKEX
+} Pkt_KCtx;
+typedef enum {
+ SSH2_PKTCTX_NOAUTH,
+ SSH2_PKTCTX_PUBLICKEY,
+ SSH2_PKTCTX_PASSWORD,
+ SSH2_PKTCTX_GSSAPI,
+ SSH2_PKTCTX_KBDINTER
+} Pkt_ACtx;
#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
#define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
#define BUG_SSH2_DERIVEKEY 32
#define BUG_SSH2_REKEY 64
#define BUG_SSH2_PK_SESSIONID 128
+#define BUG_SSH2_MAXPKT 256
+#define BUG_CHOKES_ON_SSH2_IGNORE 512
/*
* Codes for terminal modes.
* Most of these are the same in SSH-1 and SSH-2.
- * This list is derived from draft-ietf-secsh-connect-25 and
+ * This list is derived from RFC 4254 and
* SSH-1 RFC-1.2.31.
*/
static const struct {
}
#define translate(x) if (type == x) return #x
-#define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x
+#define translatek(x,ctx) if (type == x && (pkt_kctx == ctx)) return #x
+#define translatea(x,ctx) if (type == x && (pkt_actx == ctx)) return #x
static char *ssh1_pkt_type(int type)
{
translate(SSH1_MSG_DISCONNECT);
translate(SSH1_CMSG_AUTH_CCARD_RESPONSE);
return "unknown";
}
-static char *ssh2_pkt_type(int pkt_ctx, int type)
+static char *ssh2_pkt_type(Pkt_KCtx pkt_kctx, Pkt_ACtx pkt_actx, int type)
{
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE,SSH2_PKTCTX_GSSAPI);
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_TOKEN,SSH2_PKTCTX_GSSAPI);
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE,SSH2_PKTCTX_GSSAPI);
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_ERROR,SSH2_PKTCTX_GSSAPI);
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK,SSH2_PKTCTX_GSSAPI);
+ translatea(SSH2_MSG_USERAUTH_GSSAPI_MIC, SSH2_PKTCTX_GSSAPI);
translate(SSH2_MSG_DISCONNECT);
translate(SSH2_MSG_IGNORE);
translate(SSH2_MSG_UNIMPLEMENTED);
translate(SSH2_MSG_SERVICE_ACCEPT);
translate(SSH2_MSG_KEXINIT);
translate(SSH2_MSG_NEWKEYS);
- translatec(SSH2_MSG_KEXDH_INIT, SSH2_PKTCTX_DHGROUP);
- translatec(SSH2_MSG_KEXDH_REPLY, SSH2_PKTCTX_DHGROUP);
- translatec(SSH2_MSG_KEX_DH_GEX_REQUEST, SSH2_PKTCTX_DHGEX);
- translatec(SSH2_MSG_KEX_DH_GEX_GROUP, SSH2_PKTCTX_DHGEX);
- translatec(SSH2_MSG_KEX_DH_GEX_INIT, SSH2_PKTCTX_DHGEX);
- translatec(SSH2_MSG_KEX_DH_GEX_REPLY, SSH2_PKTCTX_DHGEX);
+ translatek(SSH2_MSG_KEXDH_INIT, SSH2_PKTCTX_DHGROUP);
+ translatek(SSH2_MSG_KEXDH_REPLY, SSH2_PKTCTX_DHGROUP);
+ translatek(SSH2_MSG_KEX_DH_GEX_REQUEST, SSH2_PKTCTX_DHGEX);
+ translatek(SSH2_MSG_KEX_DH_GEX_GROUP, SSH2_PKTCTX_DHGEX);
+ translatek(SSH2_MSG_KEX_DH_GEX_INIT, SSH2_PKTCTX_DHGEX);
+ translatek(SSH2_MSG_KEX_DH_GEX_REPLY, SSH2_PKTCTX_DHGEX);
+ translatek(SSH2_MSG_KEXRSA_PUBKEY, SSH2_PKTCTX_RSAKEX);
+ translatek(SSH2_MSG_KEXRSA_SECRET, SSH2_PKTCTX_RSAKEX);
+ translatek(SSH2_MSG_KEXRSA_DONE, SSH2_PKTCTX_RSAKEX);
translate(SSH2_MSG_USERAUTH_REQUEST);
translate(SSH2_MSG_USERAUTH_FAILURE);
translate(SSH2_MSG_USERAUTH_SUCCESS);
translate(SSH2_MSG_USERAUTH_BANNER);
- translatec(SSH2_MSG_USERAUTH_PK_OK, SSH2_PKTCTX_PUBLICKEY);
- translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, SSH2_PKTCTX_PASSWORD);
- translatec(SSH2_MSG_USERAUTH_INFO_REQUEST, SSH2_PKTCTX_KBDINTER);
- translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE, SSH2_PKTCTX_KBDINTER);
+ translatea(SSH2_MSG_USERAUTH_PK_OK, SSH2_PKTCTX_PUBLICKEY);
+ translatea(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, SSH2_PKTCTX_PASSWORD);
+ translatea(SSH2_MSG_USERAUTH_INFO_REQUEST, SSH2_PKTCTX_KBDINTER);
+ translatea(SSH2_MSG_USERAUTH_INFO_RESPONSE, SSH2_PKTCTX_KBDINTER);
translate(SSH2_MSG_GLOBAL_REQUEST);
translate(SSH2_MSG_REQUEST_SUCCESS);
translate(SSH2_MSG_REQUEST_FAILURE);
*
* - OUR_V2_WINSIZE is the maximum window size we present on SSH-2
* channels.
+ *
+ * - OUR_V2_BIGWIN is the window size we advertise for the only
+ * channel in a simple connection. It must be <= INT_MAX.
+ *
+ * - OUR_V2_MAXPKT is the official "maximum packet size" we send
+ * to the remote side. This actually has nothing to do with the
+ * size of the _packet_, but is instead a limit on the amount
+ * of data we're willing to receive in a single SSH2 channel
+ * data message.
+ *
+ * - OUR_V2_PACKETLIMIT is actually the maximum size of SSH
+ * _packet_ we're prepared to cope with. It must be a multiple
+ * of the cipher block size, and must be at least 35000.
*/
#define SSH1_BUFFER_LIMIT 32768
#define SSH_MAX_BACKLOG 32768
#define OUR_V2_WINSIZE 16384
+#define OUR_V2_BIGWIN 0x7fffffff
#define OUR_V2_MAXPKT 0x4000UL
+#define OUR_V2_PACKETLIMIT 0x9000UL
/* Maximum length of passwords/passphrases (arbitrary) */
#define SSH_MAX_PASSWORD_LEN 100
};
/*
+ * little structure to keep track of outstanding WINDOW_ADJUSTs
+ */
+struct winadj {
+ struct winadj *next;
+ unsigned size;
+};
+
+/*
* 2-3-4 tree storing channels.
*/
struct ssh_channel {
* A channel is completely finished with when all four bits are set.
*/
int closes;
+ /*
+ * True if this channel is causing the underlying connection to be
+ * throttled.
+ */
+ int throttling_conn;
union {
- struct ssh1_data_channel {
- int throttling;
- } v1;
struct ssh2_data_channel {
bufchain outbuffer;
unsigned remwindow, remmaxpkt;
- unsigned locwindow;
+ /* locwindow is signed so we can cope with excess data. */
+ int locwindow, locmaxwin;
+ /*
+ * remlocwin is the amount of local window that we think
+ * the remote end had available to it after it sent the
+ * last data packet or window adjust ack.
+ */
+ int remlocwin;
+ /*
+ * These store the list of window adjusts that haven't
+ * been acked.
+ */
+ struct winadj *winadj_head, *winadj_tail;
+ enum { THROTTLED, UNTHROTTLING, UNTHROTTLED } throttle_state;
} v2;
} v;
union {
static int ssh2_try_send(struct ssh_channel *c);
static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len);
static void ssh_throttle_all(Ssh ssh, int enable, int bufsize);
-static void ssh2_set_window(struct ssh_channel *c, unsigned newwin);
+static void ssh2_set_window(struct ssh_channel *c, int newwin);
static int ssh_sendbuffer(void *handle);
static int ssh_do_close(Ssh ssh, int notify_exit);
static unsigned long ssh_pkt_getuint32(struct Packet *pkt);
bufchain banner; /* accumulates banners during do_ssh2_authconn */
- int pkt_ctx;
+ Pkt_KCtx pkt_kctx;
+ Pkt_ACtx pkt_actx;
- void *x11auth;
+ struct X11Display *x11disp;
int version;
- int v1_throttle_count;
+ int conn_throttle_count;
int overall_bufsize;
int throttled_all;
int v1_stdout_throttling;
int kex_in_progress;
long next_rekey, last_rekey;
char *deferred_rekey_reason; /* points to STATIC string; don't free */
+
+ /*
+ * Fully qualified host name, which we need if doing GSSAPI.
+ */
+ char *fullhostname;
};
#define logevent(s) logevent(ssh->frontend, s)
/* "Session data" packets - omit the data field */
if ((st->pktin->type == SSH1_SMSG_STDOUT_DATA) ||
(st->pktin->type == SSH1_SMSG_STDERR_DATA)) {
- do_blank = TRUE; blank_prefix = 0;
- } else if (st->pktin->type == SSH1_MSG_CHANNEL_DATA) {
do_blank = TRUE; blank_prefix = 4;
+ } else if (st->pktin->type == SSH1_MSG_CHANNEL_DATA) {
+ do_blank = TRUE; blank_prefix = 8;
}
if (do_blank) {
blank.offset = blank_prefix;
PKT_INCOMING, st->pktin->type,
ssh1_pkt_type(st->pktin->type),
st->pktin->body, st->pktin->length,
- nblanks, &blank);
+ nblanks, &blank, NULL);
}
crFinish(st->pktin);
st->cipherblk = 8;
if (st->cipherblk < 8)
st->cipherblk = 8;
+ st->maclen = ssh->scmac ? ssh->scmac->len : 0;
- st->pktin->data = snewn(st->cipherblk + APIEXTRA, unsigned char);
+ if (ssh->sccipher && (ssh->sccipher->flags & SSH_CIPHER_IS_CBC) &&
+ ssh->scmac) {
+ /*
+ * When dealing with a CBC-mode cipher, we want to avoid the
+ * possibility of an attacker's tweaking the ciphertext stream
+ * so as to cause us to feed the same block to the block
+ * cipher more than once and thus leak information
+ * (VU#958563). The way we do this is not to take any
+ * decisions on the basis of anything we've decrypted until
+ * we've verified it with a MAC. That includes the packet
+ * length, so we just read data and check the MAC repeatedly,
+ * and when the MAC passes, see if the length we've got is
+ * plausible.
+ */
- /*
- * Acquire and decrypt the first block of the packet. This will
- * contain the length and padding details.
- */
- for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) {
- while ((*datalen) == 0)
- crReturn(NULL);
- st->pktin->data[st->i] = *(*data)++;
- (*datalen)--;
- }
+ /* May as well allocate the whole lot now. */
+ st->pktin->data = snewn(OUR_V2_PACKETLIMIT + st->maclen + APIEXTRA,
+ unsigned char);
- if (ssh->sccipher)
- ssh->sccipher->decrypt(ssh->sc_cipher_ctx,
- st->pktin->data, st->cipherblk);
+ /* Read an amount corresponding to the MAC. */
+ for (st->i = 0; st->i < st->maclen; st->i++) {
+ while ((*datalen) == 0)
+ crReturn(NULL);
+ st->pktin->data[st->i] = *(*data)++;
+ (*datalen)--;
+ }
- /*
- * Now get the length and padding figures.
- */
- st->len = GET_32BIT(st->pktin->data);
- st->pad = st->pktin->data[4];
+ st->packetlen = 0;
+ {
+ unsigned char seq[4];
+ ssh->scmac->start(ssh->sc_mac_ctx);
+ PUT_32BIT(seq, st->incoming_sequence);
+ ssh->scmac->bytes(ssh->sc_mac_ctx, seq, 4);
+ }
- /*
- * _Completely_ silly lengths should be stomped on before they
- * do us any more damage.
- */
- if (st->len < 0 || st->len > 35000 || st->pad < 4 ||
- st->len - st->pad < 1 || (st->len + 4) % st->cipherblk != 0) {
- bombout(("Incoming packet was garbled on decryption"));
- ssh_free_packet(st->pktin);
- crStop(NULL);
- }
+ for (;;) { /* Once around this loop per cipher block. */
+ /* Read another cipher-block's worth, and tack it onto the end. */
+ for (st->i = 0; st->i < st->cipherblk; st->i++) {
+ while ((*datalen) == 0)
+ crReturn(NULL);
+ st->pktin->data[st->packetlen+st->maclen+st->i] = *(*data)++;
+ (*datalen)--;
+ }
+ /* Decrypt one more block (a little further back in the stream). */
+ ssh->sccipher->decrypt(ssh->sc_cipher_ctx,
+ st->pktin->data + st->packetlen,
+ st->cipherblk);
+ /* Feed that block to the MAC. */
+ ssh->scmac->bytes(ssh->sc_mac_ctx,
+ st->pktin->data + st->packetlen, st->cipherblk);
+ st->packetlen += st->cipherblk;
+ /* See if that gives us a valid packet. */
+ if (ssh->scmac->verresult(ssh->sc_mac_ctx,
+ st->pktin->data + st->packetlen) &&
+ (st->len = GET_32BIT(st->pktin->data)) + 4 == st->packetlen)
+ break;
+ if (st->packetlen >= OUR_V2_PACKETLIMIT) {
+ bombout(("No valid incoming packet found"));
+ ssh_free_packet(st->pktin);
+ crStop(NULL);
+ }
+ }
+ st->pktin->maxlen = st->packetlen + st->maclen;
+ st->pktin->data = sresize(st->pktin->data,
+ st->pktin->maxlen + APIEXTRA,
+ unsigned char);
+ } else {
+ st->pktin->data = snewn(st->cipherblk + APIEXTRA, unsigned char);
- /*
- * This enables us to deduce the payload length.
- */
- st->payload = st->len - st->pad - 1;
+ /*
+ * Acquire and decrypt the first block of the packet. This will
+ * contain the length and padding details.
+ */
+ for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) {
+ while ((*datalen) == 0)
+ crReturn(NULL);
+ st->pktin->data[st->i] = *(*data)++;
+ (*datalen)--;
+ }
- st->pktin->length = st->payload + 5;
+ if (ssh->sccipher)
+ ssh->sccipher->decrypt(ssh->sc_cipher_ctx,
+ st->pktin->data, st->cipherblk);
- /*
- * So now we can work out the total packet length.
- */
- st->packetlen = st->len + 4;
- st->maclen = ssh->scmac ? ssh->scmac->len : 0;
+ /*
+ * Now get the length figure.
+ */
+ st->len = GET_32BIT(st->pktin->data);
- /*
- * Allocate memory for the rest of the packet.
- */
- st->pktin->maxlen = st->packetlen + st->maclen;
- st->pktin->data = sresize(st->pktin->data,
- st->pktin->maxlen + APIEXTRA,
- unsigned char);
+ /*
+ * _Completely_ silly lengths should be stomped on before they
+ * do us any more damage.
+ */
+ if (st->len < 0 || st->len > OUR_V2_PACKETLIMIT ||
+ (st->len + 4) % st->cipherblk != 0) {
+ bombout(("Incoming packet was garbled on decryption"));
+ ssh_free_packet(st->pktin);
+ crStop(NULL);
+ }
- /*
- * Read and decrypt the remainder of the packet.
- */
- for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen;
- st->i++) {
- while ((*datalen) == 0)
- crReturn(NULL);
- st->pktin->data[st->i] = *(*data)++;
- (*datalen)--;
- }
- /* Decrypt everything _except_ the MAC. */
- if (ssh->sccipher)
- ssh->sccipher->decrypt(ssh->sc_cipher_ctx,
- st->pktin->data + st->cipherblk,
- st->packetlen - st->cipherblk);
+ /*
+ * So now we can work out the total packet length.
+ */
+ st->packetlen = st->len + 4;
- st->pktin->encrypted_len = st->packetlen;
+ /*
+ * Allocate memory for the rest of the packet.
+ */
+ st->pktin->maxlen = st->packetlen + st->maclen;
+ st->pktin->data = sresize(st->pktin->data,
+ st->pktin->maxlen + APIEXTRA,
+ unsigned char);
- /*
- * Check the MAC.
- */
- if (ssh->scmac
- && !ssh->scmac->verify(ssh->sc_mac_ctx, st->pktin->data, st->len + 4,
- st->incoming_sequence)) {
- bombout(("Incorrect MAC received on packet"));
+ /*
+ * Read and decrypt the remainder of the packet.
+ */
+ for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen;
+ st->i++) {
+ while ((*datalen) == 0)
+ crReturn(NULL);
+ st->pktin->data[st->i] = *(*data)++;
+ (*datalen)--;
+ }
+ /* Decrypt everything _except_ the MAC. */
+ if (ssh->sccipher)
+ ssh->sccipher->decrypt(ssh->sc_cipher_ctx,
+ st->pktin->data + st->cipherblk,
+ st->packetlen - st->cipherblk);
+
+ /*
+ * Check the MAC.
+ */
+ if (ssh->scmac
+ && !ssh->scmac->verify(ssh->sc_mac_ctx, st->pktin->data,
+ st->len + 4, st->incoming_sequence)) {
+ bombout(("Incorrect MAC received on packet"));
+ ssh_free_packet(st->pktin);
+ crStop(NULL);
+ }
+ }
+ /* Get and sanity-check the amount of random padding. */
+ st->pad = st->pktin->data[4];
+ if (st->pad < 4 || st->len - st->pad < 1) {
+ bombout(("Invalid padding length on received packet"));
ssh_free_packet(st->pktin);
crStop(NULL);
}
+ /*
+ * This enables us to deduce the payload length.
+ */
+ st->payload = st->len - st->pad - 1;
+
+ st->pktin->length = st->payload + 5;
+ st->pktin->encrypted_len = st->packetlen;
st->pktin->sequence = st->incoming_sequence++;
int do_blank = FALSE, blank_prefix = 0;
/* "Session data" packets - omit the data field */
if (st->pktin->type == SSH2_MSG_CHANNEL_DATA) {
- do_blank = TRUE; blank_prefix = 4;
- } else if (st->pktin->type == SSH2_MSG_CHANNEL_EXTENDED_DATA) {
do_blank = TRUE; blank_prefix = 8;
+ } else if (st->pktin->type == SSH2_MSG_CHANNEL_EXTENDED_DATA) {
+ do_blank = TRUE; blank_prefix = 12;
}
if (do_blank) {
blank.offset = blank_prefix;
}
}
log_packet(ssh->logctx, PKT_INCOMING, st->pktin->type,
- ssh2_pkt_type(ssh->pkt_ctx, st->pktin->type),
+ ssh2_pkt_type(ssh->pkt_kctx, ssh->pkt_actx,
+ st->pktin->type),
st->pktin->data+6, st->pktin->length-6,
- nblanks, &blank);
+ nblanks, &blank, &st->pktin->sequence);
}
crFinish(st->pktin);
log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[12],
ssh1_pkt_type(pkt->data[12]),
pkt->body, pkt->length - (pkt->body - pkt->data),
- pkt->nblanks, pkt->blanks);
+ pkt->nblanks, pkt->blanks, NULL);
sfree(pkt->blanks); pkt->blanks = NULL;
pkt->nblanks = 0;
zlib_compress_block(ssh->cs_comp_ctx,
pkt->data + 12, pkt->length - 12,
&compblk, &complen);
+ ssh_pkt_ensure(pkt, complen + 2); /* just in case it's got bigger */
memcpy(pkt->data + 12, compblk, complen);
sfree(compblk);
pkt->length = complen + 12;
static int s_write(Ssh ssh, void *data, int len)
{
- log_packet(ssh->logctx, PKT_OUTGOING, -1, NULL, data, len, 0, NULL);
+ if (ssh->logctx)
+ log_packet(ssh->logctx, PKT_OUTGOING, -1, NULL, data, len,
+ 0, NULL, NULL);
return sk_write(ssh->s, (char *)data, len);
}
if (ssh->logctx)
log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[5],
- ssh2_pkt_type(ssh->pkt_ctx, pkt->data[5]),
+ ssh2_pkt_type(ssh->pkt_kctx, ssh->pkt_actx, pkt->data[5]),
pkt->body, pkt->length - (pkt->body - pkt->data),
- pkt->nblanks, pkt->blanks);
+ pkt->nblanks, pkt->blanks, &ssh->v2_outgoing_sequence);
sfree(pkt->blanks); pkt->blanks = NULL;
pkt->nblanks = 0;
{
int len;
if (ssh->cscipher != NULL && (ssh->cscipher->flags & SSH_CIPHER_IS_CBC) &&
- ssh->deferred_len == 0 && !noignore) {
+ ssh->deferred_len == 0 && !noignore &&
+ !(ssh->remote_bugs & BUG_CHOKES_ON_SSH2_IGNORE)) {
/*
* Interpose an SSH_MSG_IGNORE to ensure that user data don't
* get encrypted with a known IV.
*/
struct Packet *ipkt = ssh2_pkt_init(SSH2_MSG_IGNORE);
+ ssh2_pkt_addstring_start(ipkt);
ssh2_pkt_defer_noqueue(ssh, ipkt, TRUE);
}
len = ssh2_pkt_construct(ssh, pkt);
ssh2_pkt_send_noqueue(ssh, pkt);
}
-#if 0 /* disused */
/*
* Either queue or defer a packet, depending on whether queueing is
* set.
else
ssh2_pkt_defer_noqueue(ssh, pkt, FALSE);
}
-#endif
/*
* Send the whole deferred data block constructed by
}
/*
+ * Send a packet whose length needs to be disguised (typically
+ * passwords or keyboard-interactive responses).
+ */
+static void ssh2_pkt_send_with_padding(Ssh ssh, struct Packet *pkt,
+ int padsize)
+{
+#if 0
+ if (0) {
+ /*
+ * The simplest way to do this is to adjust the
+ * variable-length padding field in the outgoing packet.
+ *
+ * Currently compiled out, because some Cisco SSH servers
+ * don't like excessively padded packets (bah, why's it
+ * always Cisco?)
+ */
+ pkt->forcepad = padsize;
+ ssh2_pkt_send(ssh, pkt);
+ } else
+#endif
+ {
+ /*
+ * If we can't do that, however, an alternative approach is
+ * to use the pkt_defer mechanism to bundle the packet
+ * tightly together with an SSH_MSG_IGNORE such that their
+ * combined length is a constant. So first we construct the
+ * final form of this packet and defer its sending.
+ */
+ ssh2_pkt_defer(ssh, pkt);
+
+ /*
+ * Now construct an SSH_MSG_IGNORE which includes a string
+ * that's an exact multiple of the cipher block size. (If
+ * the cipher is NULL so that the block size is
+ * unavailable, we don't do this trick at all, because we
+ * gain nothing by it.)
+ */
+ if (ssh->cscipher &&
+ !(ssh->remote_bugs & BUG_CHOKES_ON_SSH2_IGNORE)) {
+ int stringlen, i;
+
+ stringlen = (256 - ssh->deferred_len);
+ stringlen += ssh->cscipher->blksize - 1;
+ stringlen -= (stringlen % ssh->cscipher->blksize);
+ if (ssh->cscomp) {
+ /*
+ * Temporarily disable actual compression, so we
+ * can guarantee to get this string exactly the
+ * length we want it. The compression-disabling
+ * routine should return an integer indicating how
+ * many bytes we should adjust our string length
+ * by.
+ */
+ stringlen -=
+ ssh->cscomp->disable_compression(ssh->cs_comp_ctx);
+ }
+ pkt = ssh2_pkt_init(SSH2_MSG_IGNORE);
+ ssh2_pkt_addstring_start(pkt);
+ for (i = 0; i < stringlen; i++) {
+ char c = (char) random_byte();
+ ssh2_pkt_addstring_data(pkt, &c, 1);
+ }
+ ssh2_pkt_defer(ssh, pkt);
+ }
+ ssh_pkt_defersend(ssh);
+ }
+}
+
+/*
* Send all queued SSH-2 packets. We send them by means of
* ssh2_pkt_defer_noqueue(), in case they included a pair of
* packets that needed to be lumped together.
ssh->remote_bugs |= BUG_SSH2_REKEY;
logevent("We believe remote version has SSH-2 rekey bug");
}
+
+ if (ssh->cfg.sshbug_maxpkt2 == FORCE_ON ||
+ (ssh->cfg.sshbug_maxpkt2 == AUTO &&
+ (wc_match("1.36_sshlib GlobalSCAPE", imp) ||
+ wc_match("1.36 sshlib: GlobalScape", imp)))) {
+ /*
+ * This version ignores our makpkt and needs to be throttled.
+ */
+ ssh->remote_bugs |= BUG_SSH2_MAXPKT;
+ logevent("We believe remote version ignores SSH-2 maximum packet size");
+ }
+
+ if (ssh->cfg.sshbug_ignore2 == FORCE_ON) {
+ /*
+ * Servers that don't support SSH2_MSG_IGNORE. Currently,
+ * none detected automatically.
+ */
+ ssh->remote_bugs |= BUG_CHOKES_ON_SSH2_IGNORE;
+ logevent("We believe remote version has SSH-2 ignore bug");
+ }
}
/*
}
}
+/*
+ * Send an appropriate SSH version string.
+ */
+static void ssh_send_verstring(Ssh ssh, char *svers)
+{
+ char *verstring;
+
+ if (ssh->version == 2) {
+ /*
+ * Construct a v2 version string.
+ */
+ verstring = dupprintf("SSH-2.0-%s\015\012", sshver);
+ } else {
+ /*
+ * Construct a v1 version string.
+ */
+ verstring = dupprintf("SSH-%s-%s\012",
+ (ssh_versioncmp(svers, "1.5") <= 0 ?
+ svers : "1.5"),
+ sshver);
+ }
+
+ ssh_fix_verstring(verstring);
+
+ if (ssh->version == 2) {
+ size_t len;
+ /*
+ * Record our version string.
+ */
+ len = strcspn(verstring, "\015\012");
+ ssh->v_c = snewn(len + 1, char);
+ memcpy(ssh->v_c, verstring, len);
+ ssh->v_c[len] = 0;
+ }
+
+ logeventf(ssh, "We claim version: %.*s",
+ strcspn(verstring, "\015\012"), verstring);
+ s_write(ssh, verstring, strlen(verstring));
+ sfree(verstring);
+}
+
static int do_ssh_init(Ssh ssh, unsigned char c)
{
struct do_ssh_init_state {
crStop(0);
}
- {
- char *verstring;
+ if (s->proto2 && (ssh->cfg.sshprot >= 2 || !s->proto1))
+ ssh->version = 2;
+ else
+ ssh->version = 1;
- if (s->proto2 && (ssh->cfg.sshprot >= 2 || !s->proto1)) {
- /*
- * Construct a v2 version string.
- */
- verstring = dupprintf("SSH-2.0-%s\015\012", sshver);
- ssh->version = 2;
- } else {
- /*
- * Construct a v1 version string.
- */
- verstring = dupprintf("SSH-%s-%s\012",
- (ssh_versioncmp(s->version, "1.5") <= 0 ?
- s->version : "1.5"),
- sshver);
- ssh->version = 1;
- }
+ logeventf(ssh, "Using SSH protocol version %d", ssh->version);
- ssh_fix_verstring(verstring);
+ /* Send the version string, if we haven't already */
+ if (ssh->cfg.sshprot != 3)
+ ssh_send_verstring(ssh, s->version);
- if (ssh->version == 2) {
- size_t len;
- /*
- * Hash our version string and their version string.
- */
- len = strcspn(verstring, "\015\012");
- ssh->v_c = snewn(len + 1, char);
- memcpy(ssh->v_c, verstring, len);
- ssh->v_c[len] = 0;
- len = strcspn(s->vstring, "\015\012");
- ssh->v_s = snewn(len + 1, char);
- memcpy(ssh->v_s, s->vstring, len);
- ssh->v_s[len] = 0;
+ if (ssh->version == 2) {
+ size_t len;
+ /*
+ * Record their version string.
+ */
+ len = strcspn(s->vstring, "\015\012");
+ ssh->v_s = snewn(len + 1, char);
+ memcpy(ssh->v_s, s->vstring, len);
+ ssh->v_s[len] = 0;
- /*
- * Initialise SSH-2 protocol.
- */
- ssh->protocol = ssh2_protocol;
- ssh2_protocol_setup(ssh);
- ssh->s_rdpkt = ssh2_rdpkt;
- } else {
- /*
- * Initialise SSH-1 protocol.
- */
- ssh->protocol = ssh1_protocol;
- ssh1_protocol_setup(ssh);
- ssh->s_rdpkt = ssh1_rdpkt;
- }
- logeventf(ssh, "We claim version: %.*s",
- strcspn(verstring, "\015\012"), verstring);
- s_write(ssh, verstring, strlen(verstring));
- sfree(verstring);
- if (ssh->version == 2)
- do_ssh2_transport(ssh, NULL, -1, NULL);
+ /*
+ * Initialise SSH-2 protocol.
+ */
+ ssh->protocol = ssh2_protocol;
+ ssh2_protocol_setup(ssh);
+ ssh->s_rdpkt = ssh2_rdpkt;
+ } else {
+ /*
+ * Initialise SSH-1 protocol.
+ */
+ ssh->protocol = ssh1_protocol;
+ ssh1_protocol_setup(ssh);
+ ssh->s_rdpkt = ssh1_rdpkt;
}
-
- logeventf(ssh, "Using SSH protocol version %d", ssh->version);
+ if (ssh->version == 2)
+ do_ssh2_transport(ssh, NULL, -1, NULL);
update_specials_menu(ssh->frontend);
ssh->state = SSH_STATE_BEFORE_SIZE;
static void ssh_gotdata(Ssh ssh, unsigned char *data, int datalen)
{
/* Log raw data, if we're in that mode. */
- log_packet(ssh->logctx, PKT_INCOMING, -1, NULL, data, datalen, 0, NULL);
+ if (ssh->logctx)
+ log_packet(ssh->logctx, PKT_INCOMING, -1, NULL, data, datalen,
+ 0, NULL, NULL);
crBegin(ssh->ssh_gotdata_crstate);
del234(ssh->portfwds, pf); /* moving next one to index 0 */
free_portfwd(pf);
}
+ freetree234(ssh->portfwds);
+ ssh->portfwds = NULL;
}
return ret;
error_msg = "Server closed network connection";
}
+ if (ssh->close_expected && ssh->clean_exit && ssh->exitcode < 0)
+ ssh->exitcode = 0;
+
if (need_notify)
notify_remote_exit(ssh->frontend);
SockAddr addr;
const char *err;
- ssh->savedhost = snewn(1 + strlen(host), char);
- strcpy(ssh->savedhost, host);
+ if (*ssh->cfg.loghost) {
+ char *colon;
+
+ ssh->savedhost = dupstr(ssh->cfg.loghost);
+ ssh->savedport = 22; /* default ssh port */
- if (port < 0)
- port = 22; /* default ssh port */
- ssh->savedport = port;
+ /*
+ * A colon suffix on savedhost also lets us affect
+ * savedport.
+ *
+ * (FIXME: do something about IPv6 address literals here.)
+ */
+ colon = strrchr(ssh->savedhost, ':');
+ if (colon) {
+ *colon++ = '\0';
+ if (*colon)
+ ssh->savedport = atoi(colon);
+ }
+ } else {
+ ssh->savedhost = dupstr(host);
+ if (port < 0)
+ port = 22; /* default ssh port */
+ ssh->savedport = port;
+ }
/*
* Try to find host.
sk_addr_free(addr);
return err;
}
+ ssh->fullhostname = dupstr(*realhost); /* save in case of GSSAPI */
/*
* Open socket.
return err;
}
+ /*
+ * If the SSH version number's fixed, set it now, and if it's SSH-2,
+ * send the version string too.
+ */
+ if (ssh->cfg.sshprot == 0)
+ ssh->version = 1;
+ if (ssh->cfg.sshprot == 3) {
+ ssh->version = 2;
+ ssh_send_verstring(ssh, NULL);
+ }
+
+ /*
+ * loghost, if configured, overrides realhost.
+ */
+ if (*ssh->cfg.loghost) {
+ sfree(*realhost);
+ *realhost = dupstr(ssh->cfg.loghost);
+ }
+
return NULL;
}
/*
* Throttle or unthrottle the SSH connection.
*/
-static void ssh1_throttle(Ssh ssh, int adjust)
+static void ssh_throttle_conn(Ssh ssh, int adjust)
{
- int old_count = ssh->v1_throttle_count;
- ssh->v1_throttle_count += adjust;
- assert(ssh->v1_throttle_count >= 0);
- if (ssh->v1_throttle_count && !old_count) {
+ int old_count = ssh->conn_throttle_count;
+ ssh->conn_throttle_count += adjust;
+ assert(ssh->conn_throttle_count >= 0);
+ if (ssh->conn_throttle_count && !old_count) {
ssh_set_frozen(ssh, 1);
- } else if (!ssh->v1_throttle_count && old_count) {
+ } else if (!ssh->conn_throttle_count && old_count) {
ssh_set_frozen(ssh, 0);
}
}
} else {
send_packet(ssh, SSH1_MSG_CHANNEL_DATA,
PKT_INT, c->remoteid,
- PKTT_DATA,
PKT_INT, replylen,
+ PKTT_DATA,
PKT_DATA, sentreply, replylen,
PKTT_OTHER,
PKT_END);
ssh->v1_remote_protoflags = ssh_pkt_getuint32(pktin);
s->supported_ciphers_mask = ssh_pkt_getuint32(pktin);
s->supported_auths_mask = ssh_pkt_getuint32(pktin);
+ if ((ssh->remote_bugs & BUG_CHOKES_ON_RSA))
+ s->supported_auths_mask &= ~(1 << SSH1_AUTH_RSA);
ssh->v1_local_protoflags =
ssh->v1_remote_protoflags & SSH1_PROTOFLAGS_SUPPORTED;
fflush(stdout); /* FIXME eh? */
{
- if (!*ssh->cfg.username) {
+ if (!get_remote_username(&ssh->cfg, s->username,
+ sizeof(s->username))) {
int ret; /* need not be kept over crReturn */
s->cur_prompt = new_prompts(ssh->frontend);
s->cur_prompt->to_server = TRUE;
memcpy(s->username, s->cur_prompt->prompts[0]->result,
lenof(s->username));
free_prompts(s->cur_prompt);
- } else {
- strncpy(s->username, ssh->cfg.username, sizeof(s->username));
- s->username[sizeof(s->username)-1] = '\0';
}
send_packet(ssh, SSH1_CMSG_USER, PKT_STR, s->username, PKT_END);
crWaitUntil(pktin);
- if ((ssh->remote_bugs & BUG_CHOKES_ON_RSA)) {
+ if ((s->supported_auths_mask & (1 << SSH1_AUTH_RSA)) == 0) {
/* We must not attempt PK auth. Pretend we've already tried it. */
s->tried_publickey = s->tried_agent = 1;
} else {
/* and try again */
} else {
assert(0 && "unexpected return from loadrsakey()");
+ got_passphrase = FALSE; /* placate optimisers */
}
}
}
}
if (s->pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) {
+ if ((s->supported_auths_mask & (1 << SSH1_AUTH_PASSWORD)) == 0) {
+ bombout(("No supported authentication methods available"));
+ crStop(0);
+ }
s->cur_prompt->to_server = TRUE;
s->cur_prompt->name = dupstr("SSH password");
add_prompt(s->cur_prompt, dupprintf("%.90s@%.90s's password: ",
if (ssh->version == 1) {
send_packet(ssh, SSH1_MSG_CHANNEL_DATA,
PKT_INT, c->remoteid,
- PKTT_DATA,
- PKT_INT, len, PKT_DATA, buf, len,
+ PKT_INT, len, PKTT_DATA, PKT_DATA, buf, len,
PKTT_OTHER, PKT_END);
/*
* In SSH-1 we can return 0 here - implying that forwarded
void sshfwd_unthrottle(struct ssh_channel *c, int bufsize)
{
Ssh ssh = c->ssh;
+ int buflimit;
if (ssh->state == SSH_STATE_CLOSED)
return;
if (ssh->version == 1) {
- if (c->v.v1.throttling && bufsize < SSH1_BUFFER_LIMIT) {
- c->v.v1.throttling = 0;
- ssh1_throttle(ssh, -1);
- }
+ buflimit = SSH1_BUFFER_LIMIT;
} else {
- ssh2_set_window(c, OUR_V2_WINSIZE - bufsize);
+ buflimit = c->v.v2.locmaxwin;
+ ssh2_set_window(c, bufsize < buflimit ? buflimit - bufsize : 0);
+ }
+ if (c->throttling_conn && bufsize <= buflimit) {
+ c->throttling_conn = 0;
+ ssh_throttle_conn(ssh, -1);
}
}
epfrec = add234(ssh->portfwds, pfrec);
if (epfrec != pfrec) {
+ if (epfrec->status == DESTROY) {
+ /*
+ * We already have a port forwarding up and running
+ * with precisely these parameters. Hence, no need
+ * to do anything; simply re-tag the existing one
+ * as KEEP.
+ */
+ epfrec->status = KEEP;
+ }
/*
- * We already have a port forwarding with precisely
- * these parameters. Hence, no need to do anything;
- * simply tag the existing one as KEEP.
+ * Anything else indicates that there was a duplicate
+ * in our input, which we'll silently ignore.
*/
- epfrec->status = KEEP;
free_portfwd(pfrec);
} else {
pfrec->status = CREATE;
string, stringlen);
if (!ssh->v1_stdout_throttling && bufsize > SSH1_BUFFER_LIMIT) {
ssh->v1_stdout_throttling = 1;
- ssh1_throttle(ssh, +1);
+ ssh_throttle_conn(ssh, +1);
}
}
c = snew(struct ssh_channel);
c->ssh = ssh;
- if (x11_init(&c->u.x11.s, ssh->cfg.x11_display, c,
- ssh->x11auth, NULL, -1, &ssh->cfg) != NULL) {
+ if (x11_init(&c->u.x11.s, ssh->x11disp, c,
+ NULL, -1, &ssh->cfg) != NULL) {
logevent("Opening X11 forward connection failed");
sfree(c);
send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE,
c->halfopen = FALSE;
c->localid = alloc_channel_id(ssh);
c->closes = 0;
- c->v.v1.throttling = 0;
+ c->throttling_conn = 0;
c->type = CHAN_X11; /* identify channel type */
add234(ssh->channels, c);
send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
c->halfopen = FALSE;
c->localid = alloc_channel_id(ssh);
c->closes = 0;
- c->v.v1.throttling = 0;
+ c->throttling_conn = 0;
c->type = CHAN_AGENT; /* identify channel type */
c->u.a.lensofar = 0;
add234(ssh->channels, c);
c->halfopen = FALSE;
c->localid = alloc_channel_id(ssh);
c->closes = 0;
- c->v.v1.throttling = 0;
+ c->throttling_conn = 0;
c->type = CHAN_SOCKDATA; /* identify channel type */
add234(ssh->channels, c);
send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
c->remoteid = localid;
c->halfopen = FALSE;
c->type = CHAN_SOCKDATA;
- c->v.v1.throttling = 0;
+ c->throttling_conn = 0;
pfd_confirm(c->u.pfd.s);
}
/* Data for an agent message. Buffer it. */
while (len > 0) {
if (c->u.a.lensofar < 4) {
- unsigned int l = min(4 - c->u.a.lensofar, len);
+ unsigned int l = min(4 - c->u.a.lensofar, (unsigned)len);
memcpy(c->u.a.msglen + c->u.a.lensofar, p,
l);
p += l;
if (c->u.a.lensofar >= 4 && len > 0) {
unsigned int l =
min(c->u.a.totallen - c->u.a.lensofar,
- len);
+ (unsigned)len);
memcpy(c->u.a.message + c->u.a.lensofar, p,
l);
p += l;
bufsize = 0; /* agent channels never back up */
break;
}
- if (!c->v.v1.throttling && bufsize > SSH1_BUFFER_LIMIT) {
- c->v.v1.throttling = 1;
- ssh1_throttle(ssh, +1);
+ if (!c->throttling_conn && bufsize > SSH1_BUFFER_LIMIT) {
+ c->throttling_conn = 1;
+ ssh_throttle_conn(ssh, +1);
}
}
}
}
}
- if (ssh->cfg.x11_forward) {
- char proto[20], data[64];
+ if (ssh->cfg.x11_forward &&
+ (ssh->x11disp = x11_setup_display(ssh->cfg.x11_display,
+ ssh->cfg.x11_auth, &ssh->cfg))) {
logevent("Requesting X11 forwarding");
- ssh->x11auth = x11_invent_auth(proto, sizeof(proto),
- data, sizeof(data), ssh->cfg.x11_auth);
- x11_get_real_auth(ssh->x11auth, ssh->cfg.x11_display);
/*
* Note that while we blank the X authentication data here, we don't
* take any special action to blank the start of an X11 channel,
*/
if (ssh->v1_local_protoflags & SSH1_PROTOFLAG_SCREEN_NUMBER) {
send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING,
- PKT_STR, proto,
- PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER,
- PKT_INT, x11_get_screen_number(ssh->cfg.x11_display),
+ PKT_STR, ssh->x11disp->remoteauthprotoname,
+ PKTT_PASSWORD,
+ PKT_STR, ssh->x11disp->remoteauthdatastring,
+ PKTT_OTHER,
+ PKT_INT, ssh->x11disp->screennum,
PKT_END);
} else {
send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING,
- PKT_STR, proto,
- PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER, PKT_END);
+ PKT_STR, ssh->x11disp->remoteauthprotoname,
+ PKTT_PASSWORD,
+ PKT_STR, ssh->x11disp->remoteauthdatastring,
+ PKTT_OTHER,
+ PKT_END);
}
do {
crReturnV;
} else {
while (inlen > 0) {
int len = min(inlen, 512);
- send_packet(ssh, SSH1_CMSG_STDIN_DATA, PKTT_DATA,
- PKT_INT, len, PKT_DATA, in, len,
+ send_packet(ssh, SSH1_CMSG_STDIN_DATA,
+ PKT_INT, len, PKTT_DATA, PKT_DATA, in, len,
PKTT_OTHER, PKT_END);
in += len;
inlen -= len;
const struct ssh_mac *scmac_tobe;
const struct ssh_compress *cscomp_tobe;
const struct ssh_compress *sccomp_tobe;
- char *hostkeydata, *sigdata, *keystr, *fingerprint;
- int hostkeylen, siglen;
+ char *hostkeydata, *sigdata, *rsakeydata, *keystr, *fingerprint;
+ int hostkeylen, siglen, rsakeylen;
void *hkey; /* actual host key */
+ void *rsakey; /* for RSA kex */
unsigned char exchange_hash[SSH2_KEX_MAX_HASH_LEN];
int n_preferred_kex;
const struct ssh_kexes *preferred_kex[KEX_MAX];
s->maclist = macs, s->nmacs = lenof(macs);
begin_key_exchange:
- ssh->pkt_ctx &= ~SSH2_PKTCTX_KEX_MASK;
+ ssh->pkt_kctx = SSH2_PKTCTX_NOKEX;
{
int i, j, commalist_started;
s->preferred_kex[s->n_preferred_kex++] =
&ssh_diffiehellman_group1;
break;
+ case KEX_RSA:
+ s->preferred_kex[s->n_preferred_kex++] =
+ &ssh_rsa_kex;
+ break;
case KEX_WARN:
/* Flag for later. Don't bother if it's the last in
* the list. */
crWaitUntil(pktin); /* Ignore packet */
}
- /*
- * Work out the number of bits of key we will need from the key
- * exchange. We start with the maximum key length of either
- * cipher...
- */
- {
- int csbits, scbits;
+ if (ssh->kex->main_type == KEXTYPE_DH) {
+ /*
+ * Work out the number of bits of key we will need from the
+ * key exchange. We start with the maximum key length of
+ * either cipher...
+ */
+ {
+ int csbits, scbits;
- csbits = s->cscipher_tobe->keylen;
- scbits = s->sccipher_tobe->keylen;
- s->nbits = (csbits > scbits ? csbits : scbits);
- }
- /* The keys only have hlen-bit entropy, since they're based on
- * a hash. So cap the key size at hlen bits. */
- if (s->nbits > ssh->kex->hash->hlen * 8)
- s->nbits = ssh->kex->hash->hlen * 8;
+ csbits = s->cscipher_tobe->keylen;
+ scbits = s->sccipher_tobe->keylen;
+ s->nbits = (csbits > scbits ? csbits : scbits);
+ }
+ /* The keys only have hlen-bit entropy, since they're based on
+ * a hash. So cap the key size at hlen bits. */
+ if (s->nbits > ssh->kex->hash->hlen * 8)
+ s->nbits = ssh->kex->hash->hlen * 8;
- /*
- * If we're doing Diffie-Hellman group exchange, start by
- * requesting a group.
- */
- if (!ssh->kex->pdata) {
- logevent("Doing Diffie-Hellman group exchange");
- ssh->pkt_ctx |= SSH2_PKTCTX_DHGEX;
- /*
- * Work out how big a DH group we will need to allow that
- * much data.
- */
- s->pbits = 512 << ((s->nbits - 1) / 64);
- s->pktout = ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST);
- ssh2_pkt_adduint32(s->pktout, s->pbits);
- ssh2_pkt_send_noqueue(ssh, s->pktout);
+ /*
+ * If we're doing Diffie-Hellman group exchange, start by
+ * requesting a group.
+ */
+ if (!ssh->kex->pdata) {
+ logevent("Doing Diffie-Hellman group exchange");
+ ssh->pkt_kctx = SSH2_PKTCTX_DHGEX;
+ /*
+ * Work out how big a DH group we will need to allow that
+ * much data.
+ */
+ s->pbits = 512 << ((s->nbits - 1) / 64);
+ s->pktout = ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST);
+ ssh2_pkt_adduint32(s->pktout, s->pbits);
+ ssh2_pkt_send_noqueue(ssh, s->pktout);
+
+ crWaitUntil(pktin);
+ if (pktin->type != SSH2_MSG_KEX_DH_GEX_GROUP) {
+ bombout(("expected key exchange group packet from server"));
+ crStop(0);
+ }
+ s->p = ssh2_pkt_getmp(pktin);
+ s->g = ssh2_pkt_getmp(pktin);
+ if (!s->p || !s->g) {
+ bombout(("unable to read mp-ints from incoming group packet"));
+ crStop(0);
+ }
+ ssh->kex_ctx = dh_setup_gex(s->p, s->g);
+ s->kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT;
+ s->kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY;
+ } else {
+ ssh->pkt_kctx = SSH2_PKTCTX_DHGROUP;
+ ssh->kex_ctx = dh_setup_group(ssh->kex);
+ s->kex_init_value = SSH2_MSG_KEXDH_INIT;
+ s->kex_reply_value = SSH2_MSG_KEXDH_REPLY;
+ logeventf(ssh, "Using Diffie-Hellman with standard group \"%s\"",
+ ssh->kex->groupname);
+ }
- crWaitUntil(pktin);
- if (pktin->type != SSH2_MSG_KEX_DH_GEX_GROUP) {
- bombout(("expected key exchange group packet from server"));
- crStop(0);
- }
- s->p = ssh2_pkt_getmp(pktin);
- s->g = ssh2_pkt_getmp(pktin);
- if (!s->p || !s->g) {
- bombout(("unable to read mp-ints from incoming group packet"));
- crStop(0);
- }
- ssh->kex_ctx = dh_setup_gex(s->p, s->g);
- s->kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT;
- s->kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY;
+ logeventf(ssh, "Doing Diffie-Hellman key exchange with hash %s",
+ ssh->kex->hash->text_name);
+ /*
+ * Now generate and send e for Diffie-Hellman.
+ */
+ set_busy_status(ssh->frontend, BUSY_CPU); /* this can take a while */
+ s->e = dh_create_e(ssh->kex_ctx, s->nbits * 2);
+ s->pktout = ssh2_pkt_init(s->kex_init_value);
+ ssh2_pkt_addmp(s->pktout, s->e);
+ ssh2_pkt_send_noqueue(ssh, s->pktout);
+
+ set_busy_status(ssh->frontend, BUSY_WAITING); /* wait for server */
+ crWaitUntil(pktin);
+ if (pktin->type != s->kex_reply_value) {
+ bombout(("expected key exchange reply packet from server"));
+ crStop(0);
+ }
+ set_busy_status(ssh->frontend, BUSY_CPU); /* cogitate */
+ ssh_pkt_getstring(pktin, &s->hostkeydata, &s->hostkeylen);
+ s->hkey = ssh->hostkey->newkey(s->hostkeydata, s->hostkeylen);
+ s->f = ssh2_pkt_getmp(pktin);
+ if (!s->f) {
+ bombout(("unable to parse key exchange reply packet"));
+ crStop(0);
+ }
+ ssh_pkt_getstring(pktin, &s->sigdata, &s->siglen);
+
+ s->K = dh_find_K(ssh->kex_ctx, s->f);
+
+ /* We assume everything from now on will be quick, and it might
+ * involve user interaction. */
+ set_busy_status(ssh->frontend, BUSY_NOT);
+
+ hash_string(ssh->kex->hash, ssh->exhash, s->hostkeydata, s->hostkeylen);
+ if (!ssh->kex->pdata) {
+ hash_uint32(ssh->kex->hash, ssh->exhash, s->pbits);
+ hash_mpint(ssh->kex->hash, ssh->exhash, s->p);
+ hash_mpint(ssh->kex->hash, ssh->exhash, s->g);
+ }
+ hash_mpint(ssh->kex->hash, ssh->exhash, s->e);
+ hash_mpint(ssh->kex->hash, ssh->exhash, s->f);
+
+ dh_cleanup(ssh->kex_ctx);
+ freebn(s->f);
+ if (!ssh->kex->pdata) {
+ freebn(s->g);
+ freebn(s->p);
+ }
} else {
- ssh->pkt_ctx |= SSH2_PKTCTX_DHGROUP;
- ssh->kex_ctx = dh_setup_group(ssh->kex);
- s->kex_init_value = SSH2_MSG_KEXDH_INIT;
- s->kex_reply_value = SSH2_MSG_KEXDH_REPLY;
- logeventf(ssh, "Using Diffie-Hellman with standard group \"%s\"",
- ssh->kex->groupname);
- }
+ logeventf(ssh, "Doing RSA key exchange with hash %s",
+ ssh->kex->hash->text_name);
+ ssh->pkt_kctx = SSH2_PKTCTX_RSAKEX;
+ /*
+ * RSA key exchange. First expect a KEXRSA_PUBKEY packet
+ * from the server.
+ */
+ crWaitUntil(pktin);
+ if (pktin->type != SSH2_MSG_KEXRSA_PUBKEY) {
+ bombout(("expected RSA public key packet from server"));
+ crStop(0);
+ }
- logeventf(ssh, "Doing Diffie-Hellman key exchange with hash %s",
- ssh->kex->hash->text_name);
- /*
- * Now generate and send e for Diffie-Hellman.
- */
- set_busy_status(ssh->frontend, BUSY_CPU); /* this can take a while */
- s->e = dh_create_e(ssh->kex_ctx, s->nbits * 2);
- s->pktout = ssh2_pkt_init(s->kex_init_value);
- ssh2_pkt_addmp(s->pktout, s->e);
- ssh2_pkt_send_noqueue(ssh, s->pktout);
+ ssh_pkt_getstring(pktin, &s->hostkeydata, &s->hostkeylen);
+ hash_string(ssh->kex->hash, ssh->exhash,
+ s->hostkeydata, s->hostkeylen);
+ s->hkey = ssh->hostkey->newkey(s->hostkeydata, s->hostkeylen);
- set_busy_status(ssh->frontend, BUSY_WAITING); /* wait for server */
- crWaitUntil(pktin);
- if (pktin->type != s->kex_reply_value) {
- bombout(("expected key exchange reply packet from server"));
- crStop(0);
- }
- set_busy_status(ssh->frontend, BUSY_CPU); /* cogitate */
- ssh_pkt_getstring(pktin, &s->hostkeydata, &s->hostkeylen);
- s->f = ssh2_pkt_getmp(pktin);
- if (!s->f) {
- bombout(("unable to parse key exchange reply packet"));
- crStop(0);
- }
- ssh_pkt_getstring(pktin, &s->sigdata, &s->siglen);
+ {
+ char *keydata;
+ ssh_pkt_getstring(pktin, &keydata, &s->rsakeylen);
+ s->rsakeydata = snewn(s->rsakeylen, char);
+ memcpy(s->rsakeydata, keydata, s->rsakeylen);
+ }
- s->K = dh_find_K(ssh->kex_ctx, s->f);
+ s->rsakey = ssh_rsakex_newkey(s->rsakeydata, s->rsakeylen);
+ if (!s->rsakey) {
+ sfree(s->rsakeydata);
+ bombout(("unable to parse RSA public key from server"));
+ crStop(0);
+ }
- /* We assume everything from now on will be quick, and it might
- * involve user interaction. */
- set_busy_status(ssh->frontend, BUSY_NOT);
+ hash_string(ssh->kex->hash, ssh->exhash, s->rsakeydata, s->rsakeylen);
- hash_string(ssh->kex->hash, ssh->exhash, s->hostkeydata, s->hostkeylen);
- if (!ssh->kex->pdata) {
- hash_uint32(ssh->kex->hash, ssh->exhash, s->pbits);
- hash_mpint(ssh->kex->hash, ssh->exhash, s->p);
- hash_mpint(ssh->kex->hash, ssh->exhash, s->g);
+ /*
+ * Next, set up a shared secret K, of precisely KLEN -
+ * 2*HLEN - 49 bits, where KLEN is the bit length of the
+ * RSA key modulus and HLEN is the bit length of the hash
+ * we're using.
+ */
+ {
+ int klen = ssh_rsakex_klen(s->rsakey);
+ int nbits = klen - (2*ssh->kex->hash->hlen*8 + 49);
+ int i, byte = 0;
+ unsigned char *kstr1, *kstr2, *outstr;
+ int kstr1len, kstr2len, outstrlen;
+
+ s->K = bn_power_2(nbits - 1);
+
+ for (i = 0; i < nbits; i++) {
+ if ((i & 7) == 0) {
+ byte = random_byte();
+ }
+ bignum_set_bit(s->K, i, (byte >> (i & 7)) & 1);
+ }
+
+ /*
+ * Encode this as an mpint.
+ */
+ kstr1 = ssh2_mpint_fmt(s->K, &kstr1len);
+ kstr2 = snewn(kstr2len = 4 + kstr1len, unsigned char);
+ PUT_32BIT(kstr2, kstr1len);
+ memcpy(kstr2 + 4, kstr1, kstr1len);
+
+ /*
+ * Encrypt it with the given RSA key.
+ */
+ outstrlen = (klen + 7) / 8;
+ outstr = snewn(outstrlen, unsigned char);
+ ssh_rsakex_encrypt(ssh->kex->hash, kstr2, kstr2len,
+ outstr, outstrlen, s->rsakey);
+
+ /*
+ * And send it off in a return packet.
+ */
+ s->pktout = ssh2_pkt_init(SSH2_MSG_KEXRSA_SECRET);
+ ssh2_pkt_addstring_start(s->pktout);
+ ssh2_pkt_addstring_data(s->pktout, (char *)outstr, outstrlen);
+ ssh2_pkt_send_noqueue(ssh, s->pktout);
+
+ hash_string(ssh->kex->hash, ssh->exhash, outstr, outstrlen);
+
+ sfree(kstr2);
+ sfree(kstr1);
+ sfree(outstr);
+ }
+
+ ssh_rsakex_freekey(s->rsakey);
+
+ crWaitUntil(pktin);
+ if (pktin->type != SSH2_MSG_KEXRSA_DONE) {
+ sfree(s->rsakeydata);
+ bombout(("expected signature packet from server"));
+ crStop(0);
+ }
+
+ ssh_pkt_getstring(pktin, &s->sigdata, &s->siglen);
+
+ sfree(s->rsakeydata);
}
- hash_mpint(ssh->kex->hash, ssh->exhash, s->e);
- hash_mpint(ssh->kex->hash, ssh->exhash, s->f);
+
hash_mpint(ssh->kex->hash, ssh->exhash, s->K);
assert(ssh->kex->hash->hlen <= sizeof(s->exchange_hash));
ssh->kex->hash->final(ssh->exhash, s->exchange_hash);
- dh_cleanup(ssh->kex_ctx);
ssh->kex_ctx = NULL;
#if 0
dmemdump(s->exchange_hash, ssh->kex->hash->hlen);
#endif
- s->hkey = ssh->hostkey->newkey(s->hostkeydata, s->hostkeylen);
if (!s->hkey ||
!ssh->hostkey->verifysig(s->hkey, s->sigdata, s->siglen,
(char *)s->exchange_hash,
ssh->sccomp->text_name);
/*
- * Free key exchange data.
+ * Free shared secret.
*/
- freebn(s->f);
freebn(s->K);
- if (!ssh->kex->pdata) {
- freebn(s->g);
- freebn(s->p);
- }
/*
* Key exchange is over. Loop straight back round if we have a
len = c->v.v2.remmaxpkt;
pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA);
ssh2_pkt_adduint32(pktout, c->remoteid);
- dont_log_data(ssh, pktout, PKTLOG_OMIT);
ssh2_pkt_addstring_start(pktout);
+ dont_log_data(ssh, pktout, PKTLOG_OMIT);
ssh2_pkt_addstring_data(pktout, data, len);
end_log_omission(ssh, pktout);
ssh2_pkt_send(ssh, pktout);
}
/*
+ * Set up most of a new ssh_channel for SSH-2.
+ */
+static void ssh2_channel_init(struct ssh_channel *c)
+{
+ Ssh ssh = c->ssh;
+ c->localid = alloc_channel_id(ssh);
+ c->closes = 0;
+ c->throttling_conn = FALSE;
+ c->v.v2.locwindow = c->v.v2.locmaxwin = c->v.v2.remlocwin =
+ ssh->cfg.ssh_simple ? OUR_V2_BIGWIN : OUR_V2_WINSIZE;
+ c->v.v2.winadj_head = c->v.v2.winadj_tail = NULL;
+ c->v.v2.throttle_state = UNTHROTTLED;
+ bufchain_init(&c->v.v2.outbuffer);
+}
+
+/*
* Potentially enlarge the window on an SSH-2 channel.
*/
-static void ssh2_set_window(struct ssh_channel *c, unsigned newwin)
+static void ssh2_set_window(struct ssh_channel *c, int newwin)
{
Ssh ssh = c->ssh;
return;
/*
+ * If the remote end has a habit of ignoring maxpkt, limit the
+ * window so that it has no choice (assuming it doesn't ignore the
+ * window as well).
+ */
+ if ((ssh->remote_bugs & BUG_SSH2_MAXPKT) && newwin > OUR_V2_MAXPKT)
+ newwin = OUR_V2_MAXPKT;
+
+
+ /*
* Only send a WINDOW_ADJUST if there's significantly more window
* available than the other end thinks there is. This saves us
* sending a WINDOW_ADJUST for every character in a shell session.
*
* "Significant" is arbitrarily defined as half the window size.
*/
- if (newwin > c->v.v2.locwindow * 2) {
+ if (newwin / 2 >= c->v.v2.locwindow) {
struct Packet *pktout;
+ struct winadj *wa;
+
+ /*
+ * In order to keep track of how much window the client
+ * actually has available, we'd like it to acknowledge each
+ * WINDOW_ADJUST. We can't do that directly, so we accompany
+ * it with a CHANNEL_REQUEST that has to be acknowledged.
+ *
+ * This is only necessary if we're opening the window wide.
+ * If we're not, then throughput is being constrained by
+ * something other than the maximum window size anyway.
+ *
+ * We also only send this if the main channel has finished its
+ * initial CHANNEL_REQUESTs and installed the default
+ * CHANNEL_FAILURE handler, so as not to risk giving it
+ * unexpected CHANNEL_FAILUREs.
+ */
+ if (newwin == c->v.v2.locmaxwin &&
+ ssh->packet_dispatch[SSH2_MSG_CHANNEL_FAILURE]) {
+ pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
+ ssh2_pkt_adduint32(pktout, c->remoteid);
+ ssh2_pkt_addstring(pktout, "winadj@putty.projects.tartarus.org");
+ ssh2_pkt_addbool(pktout, TRUE);
+ ssh2_pkt_send(ssh, pktout);
+ /*
+ * CHANNEL_FAILURE doesn't come with any indication of
+ * what message caused it, so we have to keep track of the
+ * outstanding CHANNEL_REQUESTs ourselves.
+ */
+ wa = snew(struct winadj);
+ wa->size = newwin - c->v.v2.locwindow;
+ wa->next = NULL;
+ if (!c->v.v2.winadj_head)
+ c->v.v2.winadj_head = wa;
+ else
+ c->v.v2.winadj_tail->next = wa;
+ c->v.v2.winadj_tail = wa;
+ if (c->v.v2.throttle_state != UNTHROTTLED)
+ c->v.v2.throttle_state = UNTHROTTLING;
+ } else {
+ /* Pretend the WINDOW_ADJUST was acked immediately. */
+ c->v.v2.remlocwin = newwin;
+ c->v.v2.throttle_state = THROTTLED;
+ }
pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
ssh2_pkt_adduint32(pktout, c->remoteid);
ssh2_pkt_adduint32(pktout, newwin - c->v.v2.locwindow);
}
}
+/*
+ * Find the channel associated with a message. If there's no channel,
+ * or it's not properly open, make a noise about it and return NULL.
+ */
+static struct ssh_channel *ssh2_channel_msg(Ssh ssh, struct Packet *pktin)
+{
+ unsigned localid = ssh_pkt_getuint32(pktin);
+ struct ssh_channel *c;
+
+ c = find234(ssh->channels, &localid, ssh_channelfind);
+ if (!c ||
+ (c->halfopen && pktin->type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION &&
+ pktin->type != SSH2_MSG_CHANNEL_OPEN_FAILURE)) {
+ char *buf = dupprintf("Received %s for %s channel %u",
+ ssh2_pkt_type(ssh->pkt_kctx, ssh->pkt_actx,
+ pktin->type),
+ c ? "half-open" : "nonexistent", localid);
+ ssh_disconnect(ssh, NULL, buf, SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE);
+ sfree(buf);
+ return NULL;
+ }
+ return c;
+}
+
+static void ssh2_msg_channel_success(Ssh ssh, struct Packet *pktin)
+{
+ /*
+ * This should never get called. All channel requests are either
+ * sent with want_reply false or are sent before this handler gets
+ * installed.
+ */
+ struct ssh_channel *c;
+ struct winadj *wa;
+
+ c = ssh2_channel_msg(ssh, pktin);
+ if (!c)
+ return;
+ wa = c->v.v2.winadj_head;
+ if (wa)
+ ssh_disconnect(ssh, NULL, "Received SSH_MSG_CHANNEL_SUCCESS for "
+ "\"winadj@putty.projects.tartarus.org\"",
+ SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE);
+ else
+ ssh_disconnect(ssh, NULL,
+ "Received unsolicited SSH_MSG_CHANNEL_SUCCESS",
+ SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE);
+}
+
+static void ssh2_msg_channel_failure(Ssh ssh, struct Packet *pktin)
+{
+ /*
+ * The only time this should get called is for "winadj@putty"
+ * messages sent above. All other channel requests are either
+ * sent with want_reply false or are sent before this handler gets
+ * installed.
+ */
+ struct ssh_channel *c;
+ struct winadj *wa;
+
+ c = ssh2_channel_msg(ssh, pktin);
+ if (!c)
+ return;
+ wa = c->v.v2.winadj_head;
+ if (!wa) {
+ ssh_disconnect(ssh, NULL,
+ "Received unsolicited SSH_MSG_CHANNEL_FAILURE",
+ SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE);
+ return;
+ }
+ c->v.v2.winadj_head = wa->next;
+ c->v.v2.remlocwin += wa->size;
+ sfree(wa);
+ /*
+ * winadj messages are only sent when the window is fully open, so
+ * if we get an ack of one, we know any pending unthrottle is
+ * complete.
+ */
+ if (c->v.v2.throttle_state == UNTHROTTLING)
+ c->v.v2.throttle_state = UNTHROTTLED;
+}
+
static void ssh2_msg_channel_window_adjust(Ssh ssh, struct Packet *pktin)
{
- unsigned i = ssh_pkt_getuint32(pktin);
struct ssh_channel *c;
- c = find234(ssh->channels, &i, ssh_channelfind);
- if (c && !c->closes) {
+ c = ssh2_channel_msg(ssh, pktin);
+ if (!c)
+ return;
+ if (!c->closes) {
c->v.v2.remwindow += ssh_pkt_getuint32(pktin);
ssh2_try_send_and_unthrottle(c);
}
{
char *data;
int length;
- unsigned i = ssh_pkt_getuint32(pktin);
struct ssh_channel *c;
- c = find234(ssh->channels, &i, ssh_channelfind);
+ c = ssh2_channel_msg(ssh, pktin);
if (!c)
- return; /* nonexistent channel */
+ return;
if (pktin->type == SSH2_MSG_CHANNEL_EXTENDED_DATA &&
ssh_pkt_getuint32(pktin) != SSH2_EXTENDED_DATA_STDERR)
return; /* extended but not stderr */
if (data) {
int bufsize = 0;
c->v.v2.locwindow -= length;
+ c->v.v2.remlocwin -= length;
switch (c->type) {
case CHAN_MAINSESSION:
bufsize =
case CHAN_AGENT:
while (length > 0) {
if (c->u.a.lensofar < 4) {
- unsigned int l = min(4 - c->u.a.lensofar, length);
+ unsigned int l = min(4 - c->u.a.lensofar,
+ (unsigned)length);
memcpy(c->u.a.msglen + c->u.a.lensofar,
data, l);
data += l;
if (c->u.a.lensofar >= 4 && length > 0) {
unsigned int l =
min(c->u.a.totallen - c->u.a.lensofar,
- length);
+ (unsigned)length);
memcpy(c->u.a.message + c->u.a.lensofar,
data, l);
data += l;
break;
}
/*
+ * If it looks like the remote end hit the end of its window,
+ * and we didn't want it to do that, think about using a
+ * larger window.
+ */
+ if (c->v.v2.remlocwin <= 0 && c->v.v2.throttle_state == UNTHROTTLED &&
+ c->v.v2.locmaxwin < 0x40000000)
+ c->v.v2.locmaxwin += OUR_V2_WINSIZE;
+ /*
* If we are not buffering too much data,
* enlarge the window again at the remote side.
+ * If we are buffering too much, we may still
+ * need to adjust the window if the server's
+ * sent excess data.
+ */
+ ssh2_set_window(c, bufsize < c->v.v2.locmaxwin ?
+ c->v.v2.locmaxwin - bufsize : 0);
+ /*
+ * If we're either buffering way too much data, or if we're
+ * buffering anything at all and we're in "simple" mode,
+ * throttle the whole channel.
*/
- if (bufsize < OUR_V2_WINSIZE)
- ssh2_set_window(c, OUR_V2_WINSIZE - bufsize);
+ if ((bufsize > c->v.v2.locmaxwin ||
+ (ssh->cfg.ssh_simple && bufsize > 0)) &&
+ !c->throttling_conn) {
+ c->throttling_conn = 1;
+ ssh_throttle_conn(ssh, +1);
+ }
}
}
static void ssh2_msg_channel_eof(Ssh ssh, struct Packet *pktin)
{
- unsigned i = ssh_pkt_getuint32(pktin);
struct ssh_channel *c;
- c = find234(ssh->channels, &i, ssh_channelfind);
+ c = ssh2_channel_msg(ssh, pktin);
if (!c)
- return; /* nonexistent channel */
+ return;
if (c->type == CHAN_X11) {
/*
* wrap up and close the channel ourselves.
*/
x11_close(c->u.x11.s);
+ c->u.x11.s = NULL;
sshfwd_close(c);
} else if (c->type == CHAN_AGENT) {
sshfwd_close(c);
} else if (c->type == CHAN_SOCKDATA) {
pfd_close(c->u.pfd.s);
+ c->u.pfd.s = NULL;
sshfwd_close(c);
}
}
static void ssh2_msg_channel_close(Ssh ssh, struct Packet *pktin)
{
- unsigned i = ssh_pkt_getuint32(pktin);
struct ssh_channel *c;
struct Packet *pktout;
- c = find234(ssh->channels, &i, ssh_channelfind);
- if (!c || c->halfopen) {
- bombout(("Received CHANNEL_CLOSE for %s channel %d\n",
- c ? "half-open" : "nonexistent", i));
+ c = ssh2_channel_msg(ssh, pktin);
+ if (!c)
return;
- }
/* Do pre-close processing on the channel. */
switch (c->type) {
case CHAN_MAINSESSION:
static void ssh2_msg_channel_open_confirmation(Ssh ssh, struct Packet *pktin)
{
- unsigned i = ssh_pkt_getuint32(pktin);
struct ssh_channel *c;
struct Packet *pktout;
- c = find234(ssh->channels, &i, ssh_channelfind);
+ c = ssh2_channel_msg(ssh, pktin);
if (!c)
- return; /* nonexistent channel */
+ return;
if (c->type != CHAN_SOCKDATA_DORMANT)
return; /* dunno why they're confirming this */
c->remoteid = ssh_pkt_getuint32(pktin);
"Unknown channel type",
"Resource shortage",
};
- unsigned i = ssh_pkt_getuint32(pktin);
unsigned reason_code;
char *reason_string;
int reason_length;
struct ssh_channel *c;
- c = find234(ssh->channels, &i, ssh_channelfind);
+ c = ssh2_channel_msg(ssh, pktin);
if (!c)
- return; /* nonexistent channel */
+ return;
if (c->type != CHAN_SOCKDATA_DORMANT)
return; /* dunno why they're failing this */
static void ssh2_msg_channel_request(Ssh ssh, struct Packet *pktin)
{
- unsigned localid;
char *type;
int typelen, want_reply;
int reply = SSH2_MSG_CHANNEL_FAILURE; /* default */
struct ssh_channel *c;
struct Packet *pktout;
- localid = ssh_pkt_getuint32(pktin);
+ c = ssh2_channel_msg(ssh, pktin);
+ if (!c)
+ return;
ssh_pkt_getstring(pktin, &type, &typelen);
want_reply = ssh2_pkt_getbool(pktin);
/*
- * First, check that the channel exists. Otherwise,
- * we can instantly disconnect with a rude message.
- */
- c = find234(ssh->channels, &localid, ssh_channelfind);
- if (!c) {
- char *buf = dupprintf("Received channel request for nonexistent"
- " channel %d", localid);
- ssh_disconnect(ssh, NULL, buf, SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE);
- sfree(buf);
- return;
- }
-
- /*
* Having got the channel number, we now look at
* the request type string to see if it's something
* we recognise.
int msglen = 0, core = FALSE;
/* ICK: older versions of OpenSSH (e.g. 3.4p1)
* provide an `int' for the signal, despite its
- * having been a `string' in the drafts since at
+ * having been a `string' in the drafts of RFC 4254 since at
* least 2001. (Fixed in session.c 1.147.) Try to
* infer which we can safely parse it as. */
{
is_plausible = FALSE;
}
}
+ ssh->exitcode = 128; /* means `unknown signal' */
if (is_plausible) {
if (is_int) {
/* Old non-standard OpenSSH. */
int signum = ssh_pkt_getuint32(pktin);
fmt_sig = dupprintf(" %d", signum);
+ ssh->exitcode = 128 + signum;
} else {
- /* As per the drafts. */
+ /* As per RFC 4254. */
char *sig;
int siglen;
ssh_pkt_getstring(pktin, &sig, &siglen);
fmt_sig = dupprintf(" \"%.*s\"",
siglen, sig);
}
+
+ /*
+ * Really hideous method of translating the
+ * signal description back into a locally
+ * meaningful number.
+ */
+
+ if (0)
+ ;
+#define TRANSLATE_SIGNAL(s) \
+ else if (siglen == lenof(#s)-1 && !memcmp(sig, #s, siglen)) \
+ ssh->exitcode = 128 + SIG ## s
+#ifdef SIGABRT
+ TRANSLATE_SIGNAL(ABRT);
+#endif
+#ifdef SIGALRM
+ TRANSLATE_SIGNAL(ALRM);
+#endif
+#ifdef SIGFPE
+ TRANSLATE_SIGNAL(FPE);
+#endif
+#ifdef SIGHUP
+ TRANSLATE_SIGNAL(HUP);
+#endif
+#ifdef SIGILL
+ TRANSLATE_SIGNAL(ILL);
+#endif
+#ifdef SIGINT
+ TRANSLATE_SIGNAL(INT);
+#endif
+#ifdef SIGKILL
+ TRANSLATE_SIGNAL(KILL);
+#endif
+#ifdef SIGPIPE
+ TRANSLATE_SIGNAL(PIPE);
+#endif
+#ifdef SIGQUIT
+ TRANSLATE_SIGNAL(QUIT);
+#endif
+#ifdef SIGSEGV
+ TRANSLATE_SIGNAL(SEGV);
+#endif
+#ifdef SIGTERM
+ TRANSLATE_SIGNAL(TERM);
+#endif
+#ifdef SIGUSR1
+ TRANSLATE_SIGNAL(USR1);
+#endif
+#ifdef SIGUSR2
+ TRANSLATE_SIGNAL(USR2);
+#endif
+#undef TRANSLATE_SIGNAL
+ else
+ ssh->exitcode = 128;
}
core = ssh2_pkt_getbool(pktin);
ssh_pkt_getstring(pktin, &msg, &msglen);
if (typelen == 3 && !memcmp(type, "x11", 3)) {
char *addrstr;
+ const char *x11err;
ssh_pkt_getstring(pktin, &peeraddr, &peeraddrlen);
addrstr = snewn(peeraddrlen+1, char);
if (!ssh->X11_fwd_enabled)
error = "X11 forwarding is not enabled";
- else if (x11_init(&c->u.x11.s, ssh->cfg.x11_display, c,
- ssh->x11auth, addrstr, peerport,
- &ssh->cfg) != NULL) {
+ else if ((x11err = x11_init(&c->u.x11.s, ssh->x11disp, c,
+ addrstr, peerport, &ssh->cfg)) != NULL) {
+ logeventf(ssh, "Local X11 connection failed: %s", x11err);
error = "Unable to open an X11 connection";
} else {
logevent("Opening X11 forward connection succeeded");
logeventf(ssh, "Rejected channel open: %s", error);
sfree(c);
} else {
- c->localid = alloc_channel_id(ssh);
- c->closes = 0;
- c->v.v2.locwindow = OUR_V2_WINSIZE;
+ ssh2_channel_init(c);
c->v.v2.remwindow = winsize;
c->v.v2.remmaxpkt = pktsize;
- bufchain_init(&c->v.v2.outbuffer);
add234(ssh->channels, c);
pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
ssh2_pkt_adduint32(pktout, c->remoteid);
AUTH_TYPE_PUBLICKEY_OFFER_LOUD,
AUTH_TYPE_PUBLICKEY_OFFER_QUIET,
AUTH_TYPE_PASSWORD,
+ AUTH_TYPE_GSSAPI,
AUTH_TYPE_KEYBOARD_INTERACTIVE,
AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET
} type;
int done_service_req;
int gotit, need_pw, can_pubkey, can_passwd, can_keyb_inter;
int tried_pubkey_config, done_agent;
+#ifndef NO_GSSAPI
+ int can_gssapi;
+ int tried_gssapi;
+#endif
int kbd_inter_refused;
int we_are_in;
prompts_t *cur_prompt;
int try_send;
int num_env, env_left, env_ok;
struct Packet *pktout;
+#ifndef NO_GSSAPI
+ struct ssh_gss_library *gsslib;
+ Ssh_gss_ctx gss_ctx;
+ Ssh_gss_buf gss_buf;
+ Ssh_gss_buf gss_rcvtok, gss_sndtok;
+ Ssh_gss_name gss_srv_name;
+ Ssh_gss_stat gss_stat;
+#endif
};
crState(do_ssh2_authconn_state);
s->done_service_req = FALSE;
s->we_are_in = FALSE;
+#ifndef NO_GSSAPI
+ s->tried_gssapi = FALSE;
+#endif
+
if (!ssh->cfg.ssh_no_userauth) {
/*
* Request userauth protocol, and await a response to it.
* with change_username turned off we don't try to get
* it again.
*/
- } else if (!*ssh->cfg.username) {
+ } else if (!get_remote_username(&ssh->cfg, s->username,
+ sizeof(s->username))) {
int ret; /* need not be kept over crReturn */
s->cur_prompt = new_prompts(ssh->frontend);
s->cur_prompt->to_server = TRUE;
free_prompts(s->cur_prompt);
} else {
char *stuff;
- strncpy(s->username, ssh->cfg.username, sizeof(s->username));
- s->username[sizeof(s->username)-1] = '\0';
if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) {
stuff = dupprintf("Using username \"%s\".\r\n", s->username);
c_write_str(ssh, stuff);
* just in case it succeeds, and (b) so that we know what
* authentication methods we can usefully try next.
*/
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
+ ssh->pkt_actx = SSH2_PKTCTX_NOAUTH;
s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
ssh2_pkt_addstring(s->pktout, s->username);
break;
}
- if (pktin->type != SSH2_MSG_USERAUTH_FAILURE) {
+ if (pktin->type != SSH2_MSG_USERAUTH_FAILURE && s->type != AUTH_TYPE_GSSAPI) {
bombout(("Strange packet received during authentication: "
"type %d", pktin->type));
crStopV;
in_commasep_string("password", methods, methlen);
s->can_keyb_inter = ssh->cfg.try_ki_auth &&
in_commasep_string("keyboard-interactive", methods, methlen);
+#ifndef NO_GSSAPI
+ ssh_gss_init();
+ s->can_gssapi = ssh->cfg.try_gssapi_auth &&
+ in_commasep_string("gssapi-with-mic", methods, methlen) &&
+ n_ssh_gss_libraries > 0;
+#endif
}
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
+ ssh->pkt_actx = SSH2_PKTCTX_NOAUTH;
if (s->can_pubkey && !s->done_agent && s->nkeys) {
* Attempt public-key authentication using a key from Pageant.
*/
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
- ssh->pkt_ctx |= SSH2_PKTCTX_PUBLICKEY;
+ ssh->pkt_actx = SSH2_PKTCTX_PUBLICKEY;
logeventf(ssh, "Trying Pageant key #%d", s->keyi);
struct ssh2_userkey *key; /* not live over crReturn */
char *passphrase; /* not live over crReturn */
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
- ssh->pkt_ctx |= SSH2_PKTCTX_PUBLICKEY;
+ ssh->pkt_actx = SSH2_PKTCTX_PUBLICKEY;
s->tried_pubkey_config = TRUE;
key->alg->freekey(key->data);
}
+#ifndef NO_GSSAPI
+ } else if (s->can_gssapi && !s->tried_gssapi) {
+
+ /* GSSAPI Authentication */
+
+ int micoffset, len;
+ char *data;
+ Ssh_gss_buf mic;
+ s->type = AUTH_TYPE_GSSAPI;
+ s->tried_gssapi = TRUE;
+ s->gotit = TRUE;
+ ssh->pkt_actx = SSH2_PKTCTX_GSSAPI;
+
+ /*
+ * Pick the highest GSS library on the preference
+ * list.
+ */
+ {
+ int i, j;
+ s->gsslib = NULL;
+ for (i = 0; i < ngsslibs; i++) {
+ int want_id = ssh->cfg.ssh_gsslist[i];
+ for (j = 0; j < n_ssh_gss_libraries; j++)
+ if (ssh_gss_libraries[j].id == want_id) {
+ s->gsslib = &ssh_gss_libraries[j];
+ goto got_gsslib; /* double break */
+ }
+ }
+ got_gsslib:
+ /*
+ * We always expect to have found something in
+ * the above loop: we only came here if there
+ * was at least one viable GSS library, and the
+ * preference list should always mention
+ * everything and only change the order.
+ */
+ assert(s->gsslib);
+ }
+
+ if (s->gsslib->gsslogmsg)
+ logevent(s->gsslib->gsslogmsg);
+
+ /* Sending USERAUTH_REQUEST with "gssapi-with-mic" method */
+ s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
+ ssh2_pkt_addstring(s->pktout, s->username);
+ ssh2_pkt_addstring(s->pktout, "ssh-connection");
+ ssh2_pkt_addstring(s->pktout, "gssapi-with-mic");
+
+ /* add mechanism info */
+ s->gsslib->indicate_mech(s->gsslib, &s->gss_buf);
+
+ /* number of GSSAPI mechanisms */
+ ssh2_pkt_adduint32(s->pktout,1);
+
+ /* length of OID + 2 */
+ ssh2_pkt_adduint32(s->pktout, s->gss_buf.length + 2);
+ ssh2_pkt_addbyte(s->pktout, SSH2_GSS_OIDTYPE);
+
+ /* length of OID */
+ ssh2_pkt_addbyte(s->pktout, (unsigned char) s->gss_buf.length);
+
+ ssh_pkt_adddata(s->pktout, s->gss_buf.value,
+ s->gss_buf.length);
+ ssh2_pkt_send(ssh, s->pktout);
+ crWaitUntilV(pktin);
+ if (pktin->type != SSH2_MSG_USERAUTH_GSSAPI_RESPONSE) {
+ logevent("GSSAPI authentication request refused");
+ continue;
+ }
+
+ /* check returned packet ... */
+
+ ssh_pkt_getstring(pktin, &data, &len);
+ s->gss_rcvtok.value = data;
+ s->gss_rcvtok.length = len;
+ if (s->gss_rcvtok.length != s->gss_buf.length + 2 ||
+ ((char *)s->gss_rcvtok.value)[0] != SSH2_GSS_OIDTYPE ||
+ ((char *)s->gss_rcvtok.value)[1] != s->gss_buf.length ||
+ memcmp((char *)s->gss_rcvtok.value + 2,
+ s->gss_buf.value,s->gss_buf.length) ) {
+ logevent("GSSAPI authentication - wrong response from server");
+ continue;
+ }
+
+ /* now start running */
+ s->gss_stat = s->gsslib->import_name(s->gsslib,
+ ssh->fullhostname,
+ &s->gss_srv_name);
+ if (s->gss_stat != SSH_GSS_OK) {
+ if (s->gss_stat == SSH_GSS_BAD_HOST_NAME)
+ logevent("GSSAPI import name failed - Bad service name");
+ else
+ logevent("GSSAPI import name failed");
+ continue;
+ }
+
+ /* fetch TGT into GSS engine */
+ s->gss_stat = s->gsslib->acquire_cred(s->gsslib, &s->gss_ctx);
+
+ if (s->gss_stat != SSH_GSS_OK) {
+ logevent("GSSAPI authentication failed to get credentials");
+ s->gsslib->release_name(s->gsslib, &s->gss_srv_name);
+ continue;
+ }
+
+ /* initial tokens are empty */
+ SSH_GSS_CLEAR_BUF(&s->gss_rcvtok);
+ SSH_GSS_CLEAR_BUF(&s->gss_sndtok);
+
+ /* now enter the loop */
+ do {
+ s->gss_stat = s->gsslib->init_sec_context
+ (s->gsslib,
+ &s->gss_ctx,
+ s->gss_srv_name,
+ ssh->cfg.gssapifwd,
+ &s->gss_rcvtok,
+ &s->gss_sndtok);
+
+ if (s->gss_stat!=SSH_GSS_S_COMPLETE &&
+ s->gss_stat!=SSH_GSS_S_CONTINUE_NEEDED) {
+ logevent("GSSAPI authentication initialisation failed");
+
+ if (s->gsslib->display_status(s->gsslib, s->gss_ctx,
+ &s->gss_buf) == SSH_GSS_OK) {
+ logevent(s->gss_buf.value);
+ sfree(s->gss_buf.value);
+ }
+
+ break;
+ }
+ logevent("GSSAPI authentication initialised");
+
+ /* Client and server now exchange tokens until GSSAPI
+ * no longer says CONTINUE_NEEDED */
+
+ if (s->gss_sndtok.length != 0) {
+ s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
+ ssh_pkt_addstring_start(s->pktout);
+ ssh_pkt_addstring_data(s->pktout,s->gss_sndtok.value,s->gss_sndtok.length);
+ ssh2_pkt_send(ssh, s->pktout);
+ s->gsslib->free_tok(s->gsslib, &s->gss_sndtok);
+ }
+
+ if (s->gss_stat == SSH_GSS_S_CONTINUE_NEEDED) {
+ crWaitUntilV(pktin);
+ if (pktin->type != SSH2_MSG_USERAUTH_GSSAPI_TOKEN) {
+ logevent("GSSAPI authentication - bad server response");
+ s->gss_stat = SSH_GSS_FAILURE;
+ break;
+ }
+ ssh_pkt_getstring(pktin, &data, &len);
+ s->gss_rcvtok.value = data;
+ s->gss_rcvtok.length = len;
+ }
+ } while (s-> gss_stat == SSH_GSS_S_CONTINUE_NEEDED);
+
+ if (s->gss_stat != SSH_GSS_OK) {
+ s->gsslib->release_name(s->gsslib, &s->gss_srv_name);
+ s->gsslib->release_cred(s->gsslib, &s->gss_ctx);
+ continue;
+ }
+ logevent("GSSAPI authentication loop finished OK");
+
+ /* Now send the MIC */
+
+ s->pktout = ssh2_pkt_init(0);
+ micoffset = s->pktout->length;
+ ssh_pkt_addstring_start(s->pktout);
+ ssh_pkt_addstring_data(s->pktout, (char *)ssh->v2_session_id, ssh->v2_session_id_len);
+ ssh_pkt_addbyte(s->pktout, SSH2_MSG_USERAUTH_REQUEST);
+ ssh_pkt_addstring(s->pktout, s->username);
+ ssh_pkt_addstring(s->pktout, "ssh-connection");
+ ssh_pkt_addstring(s->pktout, "gssapi-with-mic");
+
+ s->gss_buf.value = (char *)s->pktout->data + micoffset;
+ s->gss_buf.length = s->pktout->length - micoffset;
+
+ s->gsslib->get_mic(s->gsslib, s->gss_ctx, &s->gss_buf, &mic);
+ s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_GSSAPI_MIC);
+ ssh_pkt_addstring_start(s->pktout);
+ ssh_pkt_addstring_data(s->pktout, mic.value, mic.length);
+ ssh2_pkt_send(ssh, s->pktout);
+ s->gsslib->free_mic(s->gsslib, &mic);
+
+ s->gotit = FALSE;
+
+ s->gsslib->release_name(s->gsslib, &s->gss_srv_name);
+ s->gsslib->release_cred(s->gsslib, &s->gss_ctx);
+ continue;
+#endif
} else if (s->can_keyb_inter && !s->kbd_inter_refused) {
/*
s->type = AUTH_TYPE_KEYBOARD_INTERACTIVE;
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
- ssh->pkt_ctx |= SSH2_PKTCTX_KBDINTER;
+ ssh->pkt_actx = SSH2_PKTCTX_KBDINTER;
s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
ssh2_pkt_addstring(s->pktout, s->username);
ssh_pkt_getstring(pktin, &lang, &lang_len);
s->cur_prompt = new_prompts(ssh->frontend);
s->cur_prompt->to_server = TRUE;
- if (name_len) {
- /* FIXME: better prefix to distinguish from
- * local prompts? */
- s->cur_prompt->name =
- dupprintf("SSH server: %.*s", name_len, name);
- s->cur_prompt->name_reqd = TRUE;
- } else {
- s->cur_prompt->name =
- dupstr("SSH server authentication");
- s->cur_prompt->name_reqd = FALSE;
- }
- /* FIXME: ugly to print "Using..." in prompt _every_
- * time round. Can this be done more subtly? */
- s->cur_prompt->instruction =
- dupprintf("Using keyboard-interactive authentication.%s%.*s",
- inst_len ? "\n" : "", inst_len, inst);
- s->cur_prompt->instr_reqd = TRUE;
/*
- * Get the prompts from the packet.
+ * Get any prompt(s) from the packet.
*/
s->num_prompts = ssh_pkt_getuint32(pktin);
for (i = 0; i < s->num_prompts; i++) {
echo, SSH_MAX_PASSWORD_LEN);
}
+ if (name_len) {
+ /* FIXME: better prefix to distinguish from
+ * local prompts? */
+ s->cur_prompt->name =
+ dupprintf("SSH server: %.*s", name_len, name);
+ s->cur_prompt->name_reqd = TRUE;
+ } else {
+ s->cur_prompt->name =
+ dupstr("SSH server authentication");
+ s->cur_prompt->name_reqd = FALSE;
+ }
+ /* We add a prefix to try to make it clear that a prompt
+ * has come from the server.
+ * FIXME: ugly to print "Using..." in prompt _every_
+ * time round. Can this be done more subtly? */
+ /* Special case: for reasons best known to themselves,
+ * some servers send k-i requests with no prompts and
+ * nothing to display. Keep quiet in this case. */
+ if (s->num_prompts || name_len || inst_len) {
+ s->cur_prompt->instruction =
+ dupprintf("Using keyboard-interactive authentication.%s%.*s",
+ inst_len ? "\n" : "", inst_len, inst);
+ s->cur_prompt->instr_reqd = TRUE;
+ } else {
+ s->cur_prompt->instr_reqd = FALSE;
+ }
+
/*
- * Get the user's responses.
+ * Display any instructions, and get the user's
+ * response(s).
*/
- if (s->num_prompts) {
+ {
int ret; /* not live over crReturn */
ret = get_userpass_input(s->cur_prompt, NULL, 0);
while (ret < 0) {
}
/*
- * Send the responses to the server.
+ * Send the response(s) to the server.
*/
s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE);
- s->pktout->forcepad = 256;
ssh2_pkt_adduint32(s->pktout, s->num_prompts);
for (i=0; i < s->num_prompts; i++) {
dont_log_password(ssh, s->pktout, PKTLOG_BLANK);
s->cur_prompt->prompts[i]->result);
end_log_omission(ssh, s->pktout);
}
- ssh2_pkt_send(ssh, s->pktout);
+ ssh2_pkt_send_with_padding(ssh, s->pktout, 256);
/*
* Get the next packet in case it's another
int ret; /* not live over crReturn */
int changereq_first_time; /* not live over crReturn */
- ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK;
- ssh->pkt_ctx |= SSH2_PKTCTX_PASSWORD;
+ ssh->pkt_actx = SSH2_PKTCTX_PASSWORD;
s->cur_prompt = new_prompts(ssh->frontend);
s->cur_prompt->to_server = TRUE;
* people who find out how long their password is!
*/
s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
- s->pktout->forcepad = 256;
ssh2_pkt_addstring(s->pktout, s->username);
ssh2_pkt_addstring(s->pktout, "ssh-connection");
/* service requested */
dont_log_password(ssh, s->pktout, PKTLOG_BLANK);
ssh2_pkt_addstring(s->pktout, s->password);
end_log_omission(ssh, s->pktout);
- ssh2_pkt_send(ssh, s->pktout);
+ ssh2_pkt_send_with_padding(ssh, s->pktout, 256);
logevent("Sent password");
s->type = AUTH_TYPE_PASSWORD;
* (see above for padding rationale)
*/
s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST);
- s->pktout->forcepad = 256;
ssh2_pkt_addstring(s->pktout, s->username);
ssh2_pkt_addstring(s->pktout, "ssh-connection");
/* service requested */
s->cur_prompt->prompts[1]->result);
free_prompts(s->cur_prompt);
end_log_omission(ssh, s->pktout);
- ssh2_pkt_send(ssh, s->pktout);
+ ssh2_pkt_send_with_padding(ssh, s->pktout, 256);
logevent("Sent new password");
/*
*/
ssh->mainchan = snew(struct ssh_channel);
ssh->mainchan->ssh = ssh;
- ssh->mainchan->localid = alloc_channel_id(ssh);
+ ssh2_channel_init(ssh->mainchan);
logeventf(ssh,
"Opening direct-tcpip channel to %s:%d in place of session",
ssh->cfg.ssh_nc_host, ssh->cfg.ssh_nc_port);
s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN);
ssh2_pkt_addstring(s->pktout, "direct-tcpip");
ssh2_pkt_adduint32(s->pktout, ssh->mainchan->localid);
- ssh->mainchan->v.v2.locwindow = OUR_V2_WINSIZE;
ssh2_pkt_adduint32(s->pktout, ssh->mainchan->v.v2.locwindow);/* our window size */
ssh2_pkt_adduint32(s->pktout, OUR_V2_MAXPKT); /* our max pkt size */
ssh2_pkt_addstring(s->pktout, ssh->cfg.ssh_nc_host);
ssh->mainchan->remoteid = ssh_pkt_getuint32(pktin);
ssh->mainchan->halfopen = FALSE;
ssh->mainchan->type = CHAN_MAINSESSION;
- ssh->mainchan->closes = 0;
ssh->mainchan->v.v2.remwindow = ssh_pkt_getuint32(pktin);
ssh->mainchan->v.v2.remmaxpkt = ssh_pkt_getuint32(pktin);
- bufchain_init(&ssh->mainchan->v.v2.outbuffer);
add234(ssh->channels, ssh->mainchan);
update_specials_menu(ssh->frontend);
logevent("Opened direct-tcpip channel");
} else {
ssh->mainchan = snew(struct ssh_channel);
ssh->mainchan->ssh = ssh;
- ssh->mainchan->localid = alloc_channel_id(ssh);
+ ssh2_channel_init(ssh->mainchan);
s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN);
ssh2_pkt_addstring(s->pktout, "session");
ssh2_pkt_adduint32(s->pktout, ssh->mainchan->localid);
- ssh->mainchan->v.v2.locwindow = OUR_V2_WINSIZE;
ssh2_pkt_adduint32(s->pktout, ssh->mainchan->v.v2.locwindow);/* our window size */
ssh2_pkt_adduint32(s->pktout, OUR_V2_MAXPKT); /* our max pkt size */
ssh2_pkt_send(ssh, s->pktout);
ssh->mainchan->remoteid = ssh_pkt_getuint32(pktin);
ssh->mainchan->halfopen = FALSE;
ssh->mainchan->type = CHAN_MAINSESSION;
- ssh->mainchan->closes = 0;
ssh->mainchan->v.v2.remwindow = ssh_pkt_getuint32(pktin);
ssh->mainchan->v.v2.remmaxpkt = ssh_pkt_getuint32(pktin);
- bufchain_init(&ssh->mainchan->v.v2.outbuffer);
add234(ssh->channels, ssh->mainchan);
update_specials_menu(ssh->frontend);
logevent("Opened channel for session");
ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN] =
ssh2_msg_channel_open;
+ if (ssh->mainchan && ssh->cfg.ssh_simple) {
+ /*
+ * This message indicates to the server that we promise
+ * not to try to run any other channel in parallel with
+ * this one, so it's safe for it to advertise a very large
+ * window and leave the flow control to TCP.
+ */
+ s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
+ ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid);
+ ssh2_pkt_addstring(s->pktout, "simple@putty.projects.tartarus.org");
+ ssh2_pkt_addbool(s->pktout, 0); /* no reply */
+ ssh2_pkt_send(ssh, s->pktout);
+ }
+
/*
* Potentially enable X11 forwarding.
*/
- if (ssh->mainchan && !ssh->ncmode && ssh->cfg.x11_forward) {
- char proto[20], data[64];
+ if (ssh->mainchan && !ssh->ncmode && ssh->cfg.x11_forward &&
+ (ssh->x11disp = x11_setup_display(ssh->cfg.x11_display,
+ ssh->cfg.x11_auth, &ssh->cfg))) {
logevent("Requesting X11 forwarding");
- ssh->x11auth = x11_invent_auth(proto, sizeof(proto),
- data, sizeof(data), ssh->cfg.x11_auth);
- x11_get_real_auth(ssh->x11auth, ssh->cfg.x11_display);
s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid);
ssh2_pkt_addstring(s->pktout, "x11-req");
ssh2_pkt_addbool(s->pktout, 1); /* want reply */
ssh2_pkt_addbool(s->pktout, 0); /* many connections */
- ssh2_pkt_addstring(s->pktout, proto);
+ ssh2_pkt_addstring(s->pktout, ssh->x11disp->remoteauthprotoname);
/*
* Note that while we blank the X authentication data here, we don't
* take any special action to blank the start of an X11 channel,
* cookie into the log.
*/
dont_log_password(ssh, s->pktout, PKTLOG_BLANK);
- ssh2_pkt_addstring(s->pktout, data);
+ ssh2_pkt_addstring(s->pktout, ssh->x11disp->remoteauthdatastring);
end_log_omission(ssh, s->pktout);
- ssh2_pkt_adduint32(s->pktout, x11_get_screen_number(ssh->cfg.x11_display));
+ ssh2_pkt_adduint32(s->pktout, ssh->x11disp->screennum);
ssh2_pkt_send(ssh, s->pktout);
crWaitUntilV(pktin);
ssh_special(ssh, TS_EOF);
/*
+ * All the initial channel requests are done, so install the default
+ * failure handler.
+ */
+ ssh->packet_dispatch[SSH2_MSG_CHANNEL_SUCCESS] = ssh2_msg_channel_success;
+ ssh->packet_dispatch[SSH2_MSG_CHANNEL_FAILURE] = ssh2_msg_channel_failure;
+
+ /*
* Transfer data!
*/
if (ssh->ldisc)
{
/* log reason code in disconnect message */
char *buf, *msg;
- int nowlen, reason, msglen;
+ int reason, msglen;
reason = ssh_pkt_getuint32(pktin);
ssh_pkt_getstring(pktin, &msg, &msglen);
}
logevent(buf);
sfree(buf);
- buf = dupprintf("Disconnection message text: %n%.*s",
- &nowlen, msglen, msg);
+ buf = dupprintf("Disconnection message text: %.*s",
+ msglen, msg);
logevent(buf);
- bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"",
+ bombout(("Server sent disconnect message\ntype %d (%s):\n\"%.*s\"",
reason,
(reason > 0 && reason < lenof(ssh2_disconnect_reasons)) ?
ssh2_disconnect_reasons[reason] : "unknown",
- buf+nowlen));
+ msglen, msg));
sfree(buf);
}
ssh->deferred_len = 0;
ssh->deferred_size = 0;
ssh->fallback_cmd = 0;
- ssh->pkt_ctx = 0;
- ssh->x11auth = NULL;
+ ssh->pkt_kctx = SSH2_PKTCTX_NOKEX;
+ ssh->pkt_actx = SSH2_PKTCTX_NOAUTH;
+ ssh->x11disp = NULL;
ssh->v1_compressing = FALSE;
ssh->v2_outgoing_sequence = 0;
ssh->ssh1_rdpkt_crstate = 0;
ssh->send_ok = 0;
ssh->editing = 0;
ssh->echoing = 0;
- ssh->v1_throttle_count = 0;
+ ssh->conn_throttle_count = 0;
ssh->overall_bufsize = 0;
ssh->fallback_cmd = 0;
ssh->rportfwds = NULL;
}
sfree(ssh->deferred_send_data);
- if (ssh->x11auth)
- x11_free_auth(ssh->x11auth);
+ if (ssh->x11disp)
+ x11_free_display(ssh->x11disp);
sfree(ssh->do_ssh_init_state);
sfree(ssh->do_ssh1_login_state);
sfree(ssh->do_ssh2_transport_state);
sfree(ssh->do_ssh2_authconn_state);
sfree(ssh->v_c);
sfree(ssh->v_s);
+ sfree(ssh->fullhostname);
if (ssh->crcda_ctx) {
crcda_free_context(ssh->crcda_ctx);
ssh->crcda_ctx = NULL;
static const struct telnet_special ssh1_ignore_special[] = {
{"IGNORE message", TS_NOP}
};
- static const struct telnet_special ssh2_transport_specials[] = {
+ static const struct telnet_special ssh2_ignore_special[] = {
{"IGNORE message", TS_NOP},
+ };
+ static const struct telnet_special ssh2_rekey_special[] = {
{"Repeat key exchange", TS_REKEY},
};
static const struct telnet_special ssh2_session_specials[] = {
{NULL, TS_SEP},
{"Break", TS_BRK},
- /* These are the signal names defined by draft-ietf-secsh-connect-23.
+ /* These are the signal names defined by RFC 4254.
* They include all the ISO C signals, but are a subset of the POSIX
* required signals. */
{"SIGINT (Interrupt)", TS_SIGINT},
{NULL, TS_EXITMENU}
};
/* XXX review this length for any changes: */
- static struct telnet_special ssh_specials[lenof(ssh2_transport_specials) +
+ static struct telnet_special ssh_specials[lenof(ssh2_ignore_special) +
+ lenof(ssh2_rekey_special) +
lenof(ssh2_session_specials) +
lenof(specials_end)];
Ssh ssh = (Ssh) handle;
if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE))
ADD_SPECIALS(ssh1_ignore_special);
} else if (ssh->version == 2) {
- ADD_SPECIALS(ssh2_transport_specials);
+ if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH2_IGNORE))
+ ADD_SPECIALS(ssh2_ignore_special);
+ if (!(ssh->remote_bugs & BUG_SSH2_REKEY))
+ ADD_SPECIALS(ssh2_rekey_special);
if (ssh->mainchan)
ADD_SPECIALS(ssh2_session_specials);
} /* else we're not ready yet */
if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE))
send_packet(ssh, SSH1_MSG_IGNORE, PKT_STR, "", PKT_END);
} else {
- pktout = ssh2_pkt_init(SSH2_MSG_IGNORE);
- ssh2_pkt_addstring_start(pktout);
- ssh2_pkt_send_noqueue(ssh, pktout);
+ if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH2_IGNORE)) {
+ pktout = ssh2_pkt_init(SSH2_MSG_IGNORE);
+ ssh2_pkt_addstring_start(pktout);
+ ssh2_pkt_send_noqueue(ssh, pktout);
+ }
}
} else if (code == TS_REKEY) {
if (!ssh->kex_in_progress && ssh->version == 2) {
Ssh ssh = (Ssh) handle;
struct ssh_channel *c;
c = snew(struct ssh_channel);
- c->ssh = ssh;
- if (c) {
- c->halfopen = TRUE;
- c->localid = alloc_channel_id(ssh);
- c->closes = 0;
- c->type = CHAN_SOCKDATA_DORMANT;/* identify channel type */
- c->u.pfd.s = s;
- bufchain_init(&c->v.v2.outbuffer);
- add234(ssh->channels, c);
- }
+ c->ssh = ssh;
+ ssh2_channel_init(c);
+ c->halfopen = TRUE;
+ c->type = CHAN_SOCKDATA_DORMANT;/* identify channel type */
+ c->u.pfd.s = s;
+ add234(ssh->channels, c);
return c;
}
static void ssh_unthrottle(void *handle, int bufsize)
{
Ssh ssh = (Ssh) handle;
+ int buflimit;
+
if (ssh->version == 1) {
if (ssh->v1_stdout_throttling && bufsize < SSH1_BUFFER_LIMIT) {
ssh->v1_stdout_throttling = 0;
- ssh1_throttle(ssh, -1);
+ ssh_throttle_conn(ssh, -1);
}
} else {
- if (ssh->mainchan && ssh->mainchan->closes == 0)
- ssh2_set_window(ssh->mainchan, OUR_V2_WINSIZE - bufsize);
+ if (ssh->mainchan) {
+ ssh2_set_window(ssh->mainchan,
+ bufsize < ssh->mainchan->v.v2.locmaxwin ?
+ ssh->mainchan->v.v2.locmaxwin - bufsize : 0);
+ if (ssh->cfg.ssh_simple)
+ buflimit = 0;
+ else
+ buflimit = ssh->mainchan->v.v2.locmaxwin;
+ if (ssh->mainchan->throttling_conn && bufsize <= buflimit) {
+ ssh->mainchan->throttling_conn = 0;
+ ssh_throttle_conn(ssh, -1);
+ }
+ }
}
}
pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN);
ssh2_pkt_addstring(pktout, "direct-tcpip");
ssh2_pkt_adduint32(pktout, c->localid);
- c->v.v2.locwindow = OUR_V2_WINSIZE;
ssh2_pkt_adduint32(pktout, c->v.v2.locwindow);/* our window size */
ssh2_pkt_adduint32(pktout, OUR_V2_MAXPKT); /* our max pkt size */
ssh2_pkt_addstring(pktout, hostname);
ssh_provide_logctx,
ssh_unthrottle,
ssh_cfg_info,
+ "ssh",
+ PROT_SSH,
22
};
projects / u / mdw / putty / blobdiff