+#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
-#include <winsock.h>
#include "putty.h"
+#include "tree234.h"
#include "ssh.h"
-#include "scp.h"
#ifndef FALSE
#define FALSE 0
#endif
#define logevent(s) { logevent(s); \
- if (!(flags & FLAG_CONNECTION) && (flags & FLAG_VERBOSE)) \
+ if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \
fprintf(stderr, "%s\n", s); }
-#define SSH1_MSG_DISCONNECT 1
-#define SSH1_SMSG_PUBLIC_KEY 2
-#define SSH1_CMSG_SESSION_KEY 3
-#define SSH1_CMSG_USER 4
-#define SSH1_CMSG_AUTH_RSA 6
-#define SSH1_SMSG_AUTH_RSA_CHALLENGE 7
-#define SSH1_CMSG_AUTH_RSA_RESPONSE 8
-#define SSH1_CMSG_AUTH_PASSWORD 9
-#define SSH1_CMSG_REQUEST_PTY 10
-#define SSH1_CMSG_WINDOW_SIZE 11
-#define SSH1_CMSG_EXEC_SHELL 12
-#define SSH1_CMSG_EXEC_CMD 13
-#define SSH1_SMSG_SUCCESS 14
-#define SSH1_SMSG_FAILURE 15
-#define SSH1_CMSG_STDIN_DATA 16
-#define SSH1_SMSG_STDOUT_DATA 17
-#define SSH1_SMSG_STDERR_DATA 18
-#define SSH1_CMSG_EOF 19
-#define SSH1_SMSG_EXIT_STATUS 20
-#define SSH1_CMSG_EXIT_CONFIRMATION 33
-#define SSH1_MSG_IGNORE 32
-#define SSH1_MSG_DEBUG 36
-#define SSH1_CMSG_AUTH_TIS 39
-#define SSH1_SMSG_AUTH_TIS_CHALLENGE 40
-#define SSH1_CMSG_AUTH_TIS_RESPONSE 41
-
-#define SSH1_AUTH_TIS 5
-
-#define SSH2_MSG_DISCONNECT 1
-#define SSH2_MSG_IGNORE 2
-#define SSH2_MSG_UNIMPLEMENTED 3
-#define SSH2_MSG_DEBUG 4
-#define SSH2_MSG_SERVICE_REQUEST 5
-#define SSH2_MSG_SERVICE_ACCEPT 6
-#define SSH2_MSG_KEXINIT 20
-#define SSH2_MSG_NEWKEYS 21
-#define SSH2_MSG_KEXDH_INIT 30
-#define SSH2_MSG_KEXDH_REPLY 31
-#define SSH2_MSG_USERAUTH_REQUEST 50
-#define SSH2_MSG_USERAUTH_FAILURE 51
-#define SSH2_MSG_USERAUTH_SUCCESS 52
-#define SSH2_MSG_USERAUTH_BANNER 53
-#define SSH2_MSG_USERAUTH_PK_OK 60
-#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60
-#define SSH2_MSG_GLOBAL_REQUEST 80
-#define SSH2_MSG_REQUEST_SUCCESS 81
-#define SSH2_MSG_REQUEST_FAILURE 82
-#define SSH2_MSG_CHANNEL_OPEN 90
-#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91
-#define SSH2_MSG_CHANNEL_OPEN_FAILURE 92
-#define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93
-#define SSH2_MSG_CHANNEL_DATA 94
-#define SSH2_MSG_CHANNEL_EXTENDED_DATA 95
-#define SSH2_MSG_CHANNEL_EOF 96
-#define SSH2_MSG_CHANNEL_CLOSE 97
-#define SSH2_MSG_CHANNEL_REQUEST 98
-#define SSH2_MSG_CHANNEL_SUCCESS 99
-#define SSH2_MSG_CHANNEL_FAILURE 100
-
-#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1
-#define SSH2_OPEN_CONNECT_FAILED 2
-#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3
-#define SSH2_OPEN_RESOURCE_SHORTAGE 4
-#define SSH2_EXTENDED_DATA_STDERR 1
+#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_CMSG_SESSION_KEY 3 /* 0x3 */
+#define SSH1_CMSG_USER 4 /* 0x4 */
+#define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */
+#define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */
+#define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */
+#define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */
+#define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */
+#define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */
+#define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */
+#define SSH1_CMSG_EXEC_CMD 13 /* 0xd */
+#define SSH1_SMSG_SUCCESS 14 /* 0xe */
+#define SSH1_SMSG_FAILURE 15 /* 0xf */
+#define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */
+#define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */
+#define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */
+#define SSH1_CMSG_EOF 19 /* 0x13 */
+#define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */
+#define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */
+#define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */
+#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_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 SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */
+#define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */
+#define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */
+#define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */
+#define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */
+
+#define SSH1_AUTH_TIS 5 /* 0x5 */
+#define SSH1_AUTH_CCARD 16 /* 0x10 */
+
+#define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 /* 0x1 */
+#define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 /* 0x2 */
+#define SSH_AGENTC_RSA_CHALLENGE 3 /* 0x3 */
+#define SSH_AGENT_RSA_RESPONSE 4 /* 0x4 */
+#define SSH_AGENT_FAILURE 5 /* 0x5 */
+#define SSH_AGENT_SUCCESS 6 /* 0x6 */
+#define SSH_AGENTC_ADD_RSA_IDENTITY 7 /* 0x7 */
+#define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 /* 0x8 */
+
+#define SSH2_MSG_DISCONNECT 1 /* 0x1 */
+#define SSH2_MSG_IGNORE 2 /* 0x2 */
+#define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */
+#define SSH2_MSG_DEBUG 4 /* 0x4 */
+#define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */
+#define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */
+#define SSH2_MSG_KEXINIT 20 /* 0x14 */
+#define SSH2_MSG_NEWKEYS 21 /* 0x15 */
+#define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */
+#define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */
+#define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */
+#define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */
+#define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */
+#define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */
+#define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */
+#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */
+#define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */
+#define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */
+#define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */
+#define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */
+#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */
+#define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */
+#define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */
+#define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */
+#define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */
+#define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */
+#define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */
+#define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */
+#define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */
+#define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */
+
+#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */
+#define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */
+#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */
+#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */
+#define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */
+#define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */
+#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */
+#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */
+#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */
+#define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */
+#define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */
+
+#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */
+#define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */
+#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */
+#define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */
+
+#define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */
#define GET_32BIT(cp) \
(((unsigned long)(unsigned char)(cp)[0] << 24) | \
#define crWaitUntil(c) do { crReturn(0); } while (!(c))
#define crWaitUntilV(c) do { crReturnV; } while (!(c))
-extern struct ssh_cipher ssh_3des;
-extern struct ssh_cipher ssh_3des_ssh2;
-extern struct ssh_cipher ssh_des;
-extern struct ssh_cipher ssh_blowfish;
+extern const struct ssh_cipher ssh_3des;
+extern const struct ssh_cipher ssh_3des_ssh2;
+extern const struct ssh_cipher ssh_des;
+extern const struct ssh_cipher ssh_blowfish_ssh1;
+extern const struct ssh_cipher ssh_blowfish_ssh2;
-/* for ssh 2; we miss out single-DES because it isn't supported */
-struct ssh_cipher *ciphers[] = { &ssh_3des_ssh2, &ssh_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);
-extern struct ssh_kex ssh_diffiehellman;
-struct ssh_kex *kex_algs[] = { &ssh_diffiehellman };
+/*
+ * Ciphers for SSH2. We miss out single-DES because it isn't
+ * supported; also 3DES and Blowfish are both done differently from
+ * 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 };
-extern struct ssh_hostkey ssh_dss;
-struct ssh_hostkey *hostkey_algs[] = { &ssh_dss };
+extern const struct ssh_kex ssh_diffiehellman;
+const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman };
-extern struct ssh_mac ssh_sha1;
+extern const struct ssh_signkey ssh_dss;
+const static struct ssh_signkey *hostkey_algs[] = { &ssh_dss };
-SHA_State exhash;
+extern const struct ssh_mac ssh_md5, ssh_sha1, ssh_sha1_buggy;
static void nullmac_key(unsigned char *key) { }
static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { }
static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; }
-struct ssh_mac ssh_mac_none = {
+const static struct ssh_mac ssh_mac_none = {
nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0
};
-struct ssh_mac *macs[] = { &ssh_sha1, &ssh_mac_none };
+const static struct ssh_mac *macs[] = {
+ &ssh_sha1, &ssh_md5, &ssh_mac_none };
+const static struct ssh_mac *buggymacs[] = {
+ &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none };
+
+static void ssh_comp_none_init(void) { }
+static int ssh_comp_none_block(unsigned char *block, int len,
+ unsigned char **outblock, int *outlen) {
+ return 0;
+}
+const static struct ssh_compress ssh_comp_none = {
+ "none",
+ ssh_comp_none_init, ssh_comp_none_block,
+ ssh_comp_none_init, ssh_comp_none_block
+};
+extern const struct ssh_compress ssh_zlib;
+const static struct ssh_compress *compressions[] = {
+ &ssh_zlib, &ssh_comp_none };
+
+enum { /* channel types */
+ CHAN_MAINSESSION,
+ CHAN_X11,
+ CHAN_AGENT,
+};
-struct ssh_compress ssh_comp_none = {
- "none"
+/*
+ * 2-3-4 tree storing channels.
+ */
+struct ssh_channel {
+ 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 ssh_x11_channel {
+ Socket s;
+ } x11;
+ } u;
};
-struct ssh_compress *compressions[] = { &ssh_comp_none };
-static SOCKET s = INVALID_SOCKET;
+struct Packet {
+ long length;
+ int type;
+ unsigned char *data;
+ unsigned char *body;
+ long savedpos;
+ long maxlen;
+};
+
+static SHA_State exhash, exhashbase;
+
+static Socket s = NULL;
static unsigned char session_key[32];
-static struct ssh_cipher *cipher = NULL;
-static struct ssh_cipher *cscipher = NULL;
-static struct ssh_cipher *sccipher = NULL;
-static struct ssh_mac *csmac = NULL;
-static struct ssh_mac *scmac = NULL;
-static struct ssh_compress *cscomp = NULL;
-static struct ssh_compress *sccomp = NULL;
-static struct ssh_kex *kex = NULL;
-static struct ssh_hostkey *hostkey = NULL;
+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 ssh_mac *csmac = NULL;
+static const struct ssh_mac *scmac = NULL;
+static const struct ssh_compress *cscomp = NULL;
+static const struct ssh_compress *sccomp = NULL;
+static const struct ssh_kex *kex = NULL;
+static const struct ssh_signkey *hostkey = NULL;
int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = 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 void s_write (char *buf, int len) {
- while (len > 0) {
- int i = send (s, buf, len, 0);
- noise_ultralight(i);
- if (i <= 0)
- fatalbox("Lost connection while sending");
- if (i > 0)
- len -= i, buf += i;
- }
-}
+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);
-static int s_read (char *buf, int len) {
- int ret = 0;
- while (len > 0) {
- int i = recv (s, buf, len, 0);
- noise_ultralight(i);
- if (i > 0)
- len -= i, buf += i, ret += i;
- else
- return i;
- }
- return ret;
+static struct rdpkt1_state_tag {
+ long len, pad, biglen, to_read;
+ unsigned long realcrc, gotcrc;
+ unsigned char *p;
+ int i;
+ int chunk;
+} rdpkt1_state;
+
+static struct rdpkt2_state_tag {
+ long len, pad, payload, packetlen, maclen;
+ int i;
+ int cipherblk;
+ unsigned long incoming_sequence;
+} rdpkt2_state;
+
+static int ssh_channelcmp(void *av, void *bv) {
+ struct ssh_channel *a = (struct ssh_channel *)av;
+ struct ssh_channel *b = (struct ssh_channel *)bv;
+ if (a->localid < b->localid) return -1;
+ if (a->localid > b->localid) return +1;
+ return 0;
+}
+static int ssh_channelfind(void *av, void *bv) {
+ unsigned *a = (unsigned *)av;
+ struct ssh_channel *b = (struct ssh_channel *)bv;
+ if (*a < b->localid) return -1;
+ if (*a > b->localid) return +1;
+ return 0;
}
static void c_write (char *buf, int len) {
- if (!(flags & FLAG_CONNECTION)) {
+ if ((flags & FLAG_STDERR)) {
int i;
for (i = 0; i < len; i++)
if (buf[i] != '\r')
fputc(buf[i], stderr);
return;
}
- while (len--)
- c_write1(*buf++);
+ from_backend(1, buf, len);
}
-struct Packet {
- long length;
- int type;
- unsigned char *data;
- unsigned char *body;
- long savedpos;
- long maxlen;
-};
-
-static struct Packet pktin = { 0, 0, NULL, NULL, 0 };
-static struct Packet pktout = { 0, 0, NULL, NULL, 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 int (*s_rdpkt)(unsigned char **data, int *datalen);
-
/*
* Collect incoming data in the incoming packet buffer.
* Decipher and verify the packet when it is completely read.
*/
static int ssh1_rdpkt(unsigned char **data, int *datalen)
{
- static long len, pad, biglen, to_read;
- static unsigned long realcrc, gotcrc;
- static unsigned char *p;
- static int i;
+ struct rdpkt1_state_tag *st = &rdpkt1_state;
crBegin;
pktin.type = 0;
pktin.length = 0;
- for (i = len = 0; i < 4; i++) {
+ for (st->i = st->len = 0; st->i < 4; st->i++) {
while ((*datalen) == 0)
- crReturn(4-i);
- len = (len << 8) + **data;
+ crReturn(4-st->i);
+ st->len = (st->len << 8) + **data;
(*data)++, (*datalen)--;
}
#ifdef FWHACK
- if (len == 0x52656d6f) { /* "Remo"te server has closed ... */
- len = 0x300; /* big enough to carry to end */
+ if (st->len == 0x52656d6f) { /* "Remo"te server has closed ... */
+ st->len = 0x300; /* big enough to carry to end */
}
#endif
- pad = 8 - (len % 8);
- biglen = len + pad;
- pktin.length = len - 5;
+ st->pad = 8 - (st->len % 8);
+ st->biglen = st->len + st->pad;
+ pktin.length = st->len - 5;
- if (pktin.maxlen < biglen) {
- pktin.maxlen = biglen;
- pktin.data = (pktin.data == NULL ? malloc(biglen+APIEXTRA) :
- realloc(pktin.data, biglen+APIEXTRA));
+ if (pktin.maxlen < st->biglen) {
+ pktin.maxlen = st->biglen;
+ pktin.data = (pktin.data == NULL ? smalloc(st->biglen+APIEXTRA) :
+ srealloc(pktin.data, st->biglen+APIEXTRA));
if (!pktin.data)
fatalbox("Out of memory");
}
- to_read = biglen;
- p = pktin.data;
- while (to_read > 0) {
- static int chunk;
- chunk = to_read;
+ st->to_read = st->biglen;
+ st->p = pktin.data;
+ while (st->to_read > 0) {
+ st->chunk = st->to_read;
while ((*datalen) == 0)
- crReturn(to_read);
- if (chunk > (*datalen))
- chunk = (*datalen);
- memcpy(p, *data, chunk);
- *data += chunk;
- *datalen -= chunk;
- p += chunk;
- to_read -= chunk;
+ crReturn(st->to_read);
+ if (st->chunk > (*datalen))
+ st->chunk = (*datalen);
+ memcpy(st->p, *data, st->chunk);
+ *data += st->chunk;
+ *datalen -= st->chunk;
+ st->p += st->chunk;
+ st->to_read -= st->chunk;
}
if (cipher)
- cipher->decrypt(pktin.data, biglen);
+ cipher->decrypt(pktin.data, st->biglen);
+#if 0
+ debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad));
+ for (st->i = 0; st->i < st->biglen; st->i++)
+ debug((" %02x", (unsigned char)pktin.data[st->i]));
+ debug(("\r\n"));
+#endif
+
+ st->realcrc = crc32(pktin.data, st->biglen-4);
+ st->gotcrc = GET_32BIT(pktin.data+st->biglen-4);
+ if (st->gotcrc != st->realcrc) {
+ bombout(("Incorrect CRC received on packet"));
+ crReturn(0);
+ }
- pktin.type = pktin.data[pad];
- pktin.body = pktin.data + pad + 1;
+ pktin.body = pktin.data + st->pad + 1;
+
+ if (ssh1_compressing) {
+ unsigned char *decompblk;
+ int decomplen;
+#if 0
+ int i;
+ debug(("Packet payload pre-decompression:\n"));
+ for (i = -1; i < pktin.length; i++)
+ debug((" %02x", (unsigned char)pktin.body[i]));
+ debug(("\r\n"));
+#endif
+ zlib_decompress_block(pktin.body-1, pktin.length+1,
+ &decompblk, &decomplen);
+
+ if (pktin.maxlen < st->pad + decomplen) {
+ pktin.maxlen = st->pad + decomplen;
+ pktin.data = srealloc(pktin.data, pktin.maxlen+APIEXTRA);
+ pktin.body = pktin.data + st->pad + 1;
+ if (!pktin.data)
+ fatalbox("Out of memory");
+ }
- realcrc = crc32(pktin.data, biglen-4);
- gotcrc = GET_32BIT(pktin.data+biglen-4);
- if (gotcrc != realcrc) {
- fatalbox("Incorrect CRC received on packet");
+ memcpy(pktin.body-1, decompblk, decomplen);
+ sfree(decompblk);
+ pktin.length = decomplen-1;
+#if 0
+ debug(("Packet payload post-decompression:\n"));
+ for (i = -1; i < pktin.length; i++)
+ debug((" %02x", (unsigned char)pktin.body[i]));
+ debug(("\r\n"));
+#endif
}
if (pktin.type == SSH1_SMSG_STDOUT_DATA ||
pktin.type == SSH1_SMSG_STDERR_DATA ||
pktin.type == SSH1_MSG_DEBUG ||
- pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE) {
+ pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE ||
+ pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) {
long strlen = GET_32BIT(pktin.body);
- if (strlen + 4 != pktin.length)
- fatalbox("Received data packet with bogus string length");
+ if (strlen + 4 != pktin.length) {
+ bombout(("Received data packet with bogus string length"));
+ crReturn(0);
+ }
}
+ pktin.type = pktin.body[-1];
+
if (pktin.type == SSH1_MSG_DEBUG) {
/* log debug message */
char buf[80];
static int ssh2_rdpkt(unsigned char **data, int *datalen)
{
- static long len, pad, payload, packetlen, maclen;
- static int i;
- static int cipherblk;
- static unsigned long incoming_sequence = 0;
+ struct rdpkt2_state_tag *st = &rdpkt2_state;
crBegin;
next_packet:
-
pktin.type = 0;
pktin.length = 0;
-
- if (cipher)
- cipherblk = cipher->blksize;
+ if (sccipher)
+ st->cipherblk = sccipher->blksize;
else
- cipherblk = 8;
- if (cipherblk < 8)
- cipherblk = 8;
-
- if (pktin.maxlen < cipherblk) {
- pktin.maxlen = cipherblk;
- pktin.data = (pktin.data == NULL ? malloc(cipherblk+APIEXTRA) :
- realloc(pktin.data, cipherblk+APIEXTRA));
+ st->cipherblk = 8;
+ if (st->cipherblk < 8)
+ st->cipherblk = 8;
+
+ if (pktin.maxlen < st->cipherblk) {
+ pktin.maxlen = st->cipherblk;
+ pktin.data = (pktin.data == NULL ? smalloc(st->cipherblk+APIEXTRA) :
+ srealloc(pktin.data, st->cipherblk+APIEXTRA));
if (!pktin.data)
fatalbox("Out of memory");
}
* Acquire and decrypt the first block of the packet. This will
* contain the length and padding details.
*/
- for (i = len = 0; i < cipherblk; i++) {
+ for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) {
while ((*datalen) == 0)
- crReturn(cipherblk-i);
- pktin.data[i] = *(*data)++;
+ crReturn(st->cipherblk-st->i);
+ pktin.data[st->i] = *(*data)++;
(*datalen)--;
}
#ifdef FWHACK
}
#endif
if (sccipher)
- sccipher->decrypt(pktin.data, cipherblk);
+ sccipher->decrypt(pktin.data, st->cipherblk);
/*
* Now get the length and padding figures.
*/
- len = GET_32BIT(pktin.data);
- pad = pktin.data[4];
+ st->len = GET_32BIT(pktin.data);
+ st->pad = pktin.data[4];
/*
* This enables us to deduce the payload length.
*/
- payload = len - pad - 1;
+ st->payload = st->len - st->pad - 1;
- pktin.length = payload + 5;
+ pktin.length = st->payload + 5;
/*
* So now we can work out the total packet length.
*/
- packetlen = len + 4;
- maclen = scmac ? scmac->len : 0;
+ st->packetlen = st->len + 4;
+ st->maclen = scmac ? scmac->len : 0;
/*
* Adjust memory allocation if packet is too big.
*/
- if (pktin.maxlen < packetlen) {
- pktin.maxlen = packetlen;
- pktin.data = (pktin.data == NULL ? malloc(packetlen+APIEXTRA) :
- realloc(pktin.data, packetlen+APIEXTRA));
+ if (pktin.maxlen < st->packetlen+st->maclen) {
+ pktin.maxlen = st->packetlen+st->maclen;
+ pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) :
+ srealloc(pktin.data, pktin.maxlen+APIEXTRA));
if (!pktin.data)
fatalbox("Out of memory");
}
/*
* Read and decrypt the remainder of the packet.
*/
- for (i = cipherblk; i < packetlen + maclen; i++) {
+ for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; st->i++) {
while ((*datalen) == 0)
- crReturn(packetlen + maclen - i);
- pktin.data[i] = *(*data)++;
+ crReturn(st->packetlen + st->maclen - st->i);
+ pktin.data[st->i] = *(*data)++;
(*datalen)--;
}
/* Decrypt everything _except_ the MAC. */
if (sccipher)
- sccipher->decrypt(pktin.data + cipherblk, packetlen - cipherblk);
+ sccipher->decrypt(pktin.data + st->cipherblk,
+ st->packetlen - st->cipherblk);
#if 0
- debug(("Got packet len=%d pad=%d\r\n", len, pad));
- for (i = 0; i < packetlen; i++)
- debug((" %02x", (unsigned char)pktin.data[i]));
+ debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad));
+ for (st->i = 0; st->i < st->packetlen; st->i++)
+ debug((" %02x", (unsigned char)pktin.data[st->i]));
debug(("\r\n"));
#endif
/*
* Check the MAC.
*/
- if (scmac && !scmac->verify(pktin.data, len+4, incoming_sequence))
- fatalbox("Incorrect MAC received on packet");
- incoming_sequence++; /* whether or not we MACed */
+ if (scmac && !scmac->verify(pktin.data, st->len+4, st->incoming_sequence)) {
+ bombout(("Incorrect MAC received on packet"));
+ crReturn(0);
+ }
+ st->incoming_sequence++; /* whether or not we MACed */
+
+ /*
+ * Decompress packet payload.
+ */
+ {
+ unsigned char *newpayload;
+ int newlen;
+ if (sccomp && sccomp->decompress(pktin.data+5, pktin.length-5,
+ &newpayload, &newlen)) {
+ if (pktin.maxlen < newlen+5) {
+ pktin.maxlen = newlen+5;
+ pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) :
+ srealloc(pktin.data, pktin.maxlen+APIEXTRA));
+ if (!pktin.data)
+ fatalbox("Out of memory");
+ }
+ pktin.length = 5 + newlen;
+ memcpy(pktin.data+5, newpayload, newlen);
+#if 0
+ debug(("Post-decompression payload:\r\n"));
+ for (st->i = 0; st->i < newlen; st->i++)
+ debug((" %02x", (unsigned char)pktin.data[5+st->i]));
+ debug(("\r\n"));
+#endif
+
+ sfree(newpayload);
+ }
+ }
pktin.savedpos = 6;
pktin.type = pktin.data[5];
crFinish(0);
}
-static void ssh_gotdata(unsigned char *data, int datalen)
-{
- while (datalen > 0) {
- if ( s_rdpkt(&data, &datalen) == 0 ) {
- ssh_protocol(NULL, 0, 1);
- if (ssh_state == SSH_STATE_CLOSED) {
- return;
- }
- }
- }
-}
-
-
-static void s_wrpkt_start(int type, int len) {
+static void ssh1_pktout_size(int len) {
int pad, biglen;
len += 5; /* type and CRC */
#ifdef MSCRYPTOAPI
/* Allocate enough buffer space for extra block
* for MS CryptEncrypt() */
- pktout.data = (pktout.data == NULL ? malloc(biglen+12) :
- realloc(pktout.data, biglen+12));
+ pktout.data = (pktout.data == NULL ? smalloc(biglen+12) :
+ srealloc(pktout.data, biglen+12));
#else
- pktout.data = (pktout.data == NULL ? malloc(biglen+4) :
- realloc(pktout.data, biglen+4));
+ pktout.data = (pktout.data == NULL ? smalloc(biglen+4) :
+ srealloc(pktout.data, biglen+4));
#endif
if (!pktout.data)
fatalbox("Out of memory");
}
+ pktout.body = pktout.data+4+pad+1;
+}
+static void s_wrpkt_start(int type, int len) {
+ ssh1_pktout_size(len);
pktout.type = type;
- pktout.body = pktout.data+4+pad+1;
}
static void s_wrpkt(void) {
int pad, len, biglen, i;
unsigned long crc;
+ pktout.body[-1] = pktout.type;
+
+ if (ssh1_compressing) {
+ unsigned char *compblk;
+ int complen;
+#if 0
+ debug(("Packet payload pre-compression:\n"));
+ for (i = -1; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.body[i]));
+ debug(("\r\n"));
+#endif
+ zlib_compress_block(pktout.body-1, pktout.length+1,
+ &compblk, &complen);
+ ssh1_pktout_size(complen-1);
+ memcpy(pktout.body-1, compblk, complen);
+ sfree(compblk);
+#if 0
+ debug(("Packet payload post-compression:\n"));
+ for (i = -1; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.body[i]));
+ debug(("\r\n"));
+#endif
+ }
+
len = pktout.length + 5; /* type and CRC */
pad = 8 - (len%8);
biglen = len + pad;
- pktout.body[-1] = pktout.type;
for (i=0; i<pad; i++)
pktout.data[i+4] = random_byte();
crc = crc32(pktout.data+4, biglen-4);
PUT_32BIT(pktout.data+biglen, crc);
PUT_32BIT(pktout.data, len);
+#if 0
+ debug(("Sending packet len=%d\r\n", biglen+4));
+ for (i = 0; i < biglen+4; i++)
+ debug((" %02x", (unsigned char)pktout.data[i]));
+ debug(("\r\n"));
+#endif
if (cipher)
cipher->encrypt(pktout.data+4, biglen);
- s_write(pktout.data, biglen+4);
+ sk_write(s, pktout.data, biglen+4);
}
/*
unsigned long argint;
int pktlen, argtype, arglen;
Bignum bn;
- int i;
pktlen = 0;
va_start(args, pkttype);
break;
case PKT_BIGNUM:
bn = va_arg(args, Bignum);
- i = 16 * bn[0] - 1;
- while ( i > 0 && (bn[i/16+1] >> (i%16)) == 0 )
- i--;
- pktlen += 2 + (i+7)/8;
+ pktlen += ssh1_bignum_length(bn);
break;
default:
assert(0);
break;
case PKT_BIGNUM:
bn = va_arg(args, Bignum);
- i = 16 * bn[0] - 1;
- while ( i > 0 && (bn[i/16+1] >> (i%16)) == 0 )
- i--;
- *p++ = (i >> 8) & 0xFF;
- *p++ = i & 0xFF;
- i = (i + 7) / 8;
- while (i-- > 0) {
- if (i % 2)
- *p++ = bn[i/2+1] >> 8;
- else
- *p++ = bn[i/2+1] & 0xFF;
- }
+ p += ssh1_write_bignum(p, bn);
break;
}
}
s_wrpkt();
}
-
-/*
- * Connect to specified host and port.
- * Returns an error message, or NULL on success.
- * Also places the canonical host name into `realhost'.
- */
-static char *connect_to_host(char *host, int port, char **realhost)
-{
- SOCKADDR_IN addr;
- struct hostent *h;
- unsigned long a;
-#ifdef FWHACK
- char *FWhost;
- int FWport;
-#endif
-
- savedhost = malloc(1+strlen(host));
- if (!savedhost)
- fatalbox("Out of memory");
- strcpy(savedhost, host);
-
- if (port < 0)
- port = 22; /* default ssh port */
-
-#ifdef FWHACK
- FWhost = host;
- FWport = port;
- host = FWSTR;
- port = 23;
-#endif
-
- /*
- * Try to find host.
- */
- if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
- if ( (h = gethostbyname(host)) == NULL)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAHOST_NOT_FOUND: case WSANO_DATA:
- return "Host does not exist";
- case WSATRY_AGAIN: return "Host not found";
- default: return "gethostbyname: unknown error";
- }
- memcpy (&a, h->h_addr, sizeof(a));
- *realhost = h->h_name;
- } else
- *realhost = host;
-#ifdef FWHACK
- *realhost = FWhost;
-#endif
- a = ntohl(a);
-
- /*
- * Open socket.
- */
- s = socket(AF_INET, SOCK_STREAM, 0);
- if (s == INVALID_SOCKET)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAEAFNOSUPPORT: return "TCP/IP support not present";
- default: return "socket(): unknown error";
- }
-
- /*
- * Bind to local address.
- */
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = htonl(INADDR_ANY);
- addr.sin_port = htons(0);
- if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- default: return "bind(): unknown error";
- }
-
- /*
- * Connect to remote address.
- */
- addr.sin_addr.s_addr = htonl(a);
- addr.sin_port = htons((short)port);
- if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAECONNREFUSED: return "Connection refused";
- case WSAENETUNREACH: return "Network is unreachable";
- case WSAEHOSTUNREACH: return "No route to host";
- default: return "connect(): unknown error";
- }
-
-#ifdef FWHACK
- send(s, "connect ", 8, 0);
- send(s, FWhost, strlen(FWhost), 0);
- {
- char buf[20];
- sprintf(buf, " %d\n", FWport);
- send (s, buf, strlen(buf), 0);
- }
-#endif
-
- return NULL;
-}
-
static int ssh_versioncmp(char *a, char *b) {
char *ae, *be;
unsigned long av, bv;
* state.
*/
#include <stdio.h>
-void sha_string(SHA_State *s, void *str, int len) {
+static void sha_string(SHA_State *s, void *str, int len) {
unsigned char lenblk[4];
PUT_32BIT(lenblk, len);
SHA_Bytes(s, lenblk, 4);
/*
* SSH2 packet construction functions.
*/
-void ssh2_pkt_adddata(void *data, int len) {
- pktout.length += len;
- if (pktout.maxlen < pktout.length) {
- pktout.maxlen = pktout.length + 256;
- pktout.data = (pktout.data == NULL ? malloc(pktout.maxlen+APIEXTRA) :
- realloc(pktout.data, pktout.maxlen+APIEXTRA));
+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);
}
-void ssh2_pkt_addbyte(unsigned char byte) {
+static void ssh2_pkt_addbyte(unsigned char byte) {
ssh2_pkt_adddata(&byte, 1);
}
-void ssh2_pkt_init(int pkt_type) {
+static void ssh2_pkt_init(int pkt_type) {
pktout.length = 5;
ssh2_pkt_addbyte((unsigned char)pkt_type);
}
-void ssh2_pkt_addbool(unsigned char value) {
+static void ssh2_pkt_addbool(unsigned char value) {
ssh2_pkt_adddata(&value, 1);
}
-void ssh2_pkt_adduint32(unsigned long value) {
+static void ssh2_pkt_adduint32(unsigned long value) {
unsigned char x[4];
PUT_32BIT(x, value);
ssh2_pkt_adddata(x, 4);
}
-void ssh2_pkt_addstring_start(void) {
+static void ssh2_pkt_addstring_start(void) {
ssh2_pkt_adduint32(0);
pktout.savedpos = pktout.length;
}
-void ssh2_pkt_addstring_str(char *data) {
+static void ssh2_pkt_addstring_str(char *data) {
ssh2_pkt_adddata(data, strlen(data));
PUT_32BIT(pktout.data + pktout.savedpos - 4,
pktout.length - pktout.savedpos);
}
-void ssh2_pkt_addstring_data(char *data, int len) {
+static void ssh2_pkt_addstring_data(char *data, int len) {
ssh2_pkt_adddata(data, len);
PUT_32BIT(pktout.data + pktout.savedpos - 4,
pktout.length - pktout.savedpos);
}
-void ssh2_pkt_addstring(char *data) {
+static void ssh2_pkt_addstring(char *data) {
ssh2_pkt_addstring_start();
ssh2_pkt_addstring_str(data);
}
-char *ssh2_mpint_fmt(Bignum b, int *len) {
+static char *ssh2_mpint_fmt(Bignum b, int *len) {
unsigned char *p;
int i, n = b[0];
- p = malloc(n * 2 + 1);
+ p = smalloc(n * 2 + 1);
if (!p)
fatalbox("out of memory");
p[0] = 0;
*len = n*2+1-i;
return p;
}
-void ssh2_pkt_addmp(Bignum b) {
+static void ssh2_pkt_addmp(Bignum b) {
unsigned char *p;
int len;
p = ssh2_mpint_fmt(b, &len);
ssh2_pkt_addstring_start();
ssh2_pkt_addstring_data(p, len);
- free(p);
+ sfree(p);
}
-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;
/*
+ * Compress packet payload.
+ */
+#if 0
+ debug(("Pre-compression payload:\r\n"));
+ for (i = 5; i < pktout.length; i++)
+ debug((" %02x", (unsigned char)pktout.data[i]));
+ debug(("\r\n"));
+#endif
+ {
+ unsigned char *newpayload;
+ int newlen;
+ if (cscomp && cscomp->compress(pktout.data+5, pktout.length-5,
+ &newpayload, &newlen)) {
+ pktout.length = 5;
+ ssh2_pkt_adddata(newpayload, newlen);
+ sfree(newpayload);
+ }
+ }
+
+ /*
* Add padding. At least four bytes, and must also bring total
* length (minus MAC) up to a multiple of the 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;
- s_write(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
for (i = 0; i < len; i++)
debug((" %02x", p[i]));
debug(("\r\n"));
- free(p);
+ sfree(p);
}
#endif
-void sha_mpint(SHA_State *s, Bignum b) {
+static void sha_mpint(SHA_State *s, Bignum b) {
unsigned char *p;
int len;
p = ssh2_mpint_fmt(b, &len);
sha_string(s, p, len);
- free(p);
+ sfree(p);
}
/*
* SSH2 packet decode functions.
*/
-unsigned long ssh2_pkt_getuint32(void) {
+static unsigned long ssh2_pkt_getuint32(void) {
unsigned long value;
if (pktin.length - pktin.savedpos < 4)
return 0; /* arrgh, no way to decline (FIXME?) */
pktin.savedpos += 4;
return value;
}
-void ssh2_pkt_getstring(char **p, int *length) {
+static void ssh2_pkt_getstring(char **p, int *length) {
*p = NULL;
if (pktin.length - pktin.savedpos < 4)
return;
*p = pktin.data+pktin.savedpos;
pktin.savedpos += *length;
}
-Bignum ssh2_pkt_getmp(void) {
+static Bignum ssh2_pkt_getmp(void) {
char *p;
int i, j, length;
Bignum b;
ssh2_pkt_getstring(&p, &length);
if (!p)
return NULL;
- if (p[0] & 0x80)
- fatalbox("internal error: Can't handle negative mpints");
+ if (p[0] & 0x80) {
+ 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;
else
b[j/2+1] |= ((unsigned char)p[i]);
}
+ while (b[0] > 1 && b[b[0]] == 0) b[0]--;
return b;
}
-static int do_ssh_init(void) {
- char c, *vsp;
- char version[10];
- char vstring[80];
- char vlog[sizeof(vstring)+20];
- int i;
+static int do_ssh_init(unsigned char c) {
+ static char *vsp;
+ static char version[10];
+ static char vstring[80];
+ static char vlog[sizeof(vstring)+20];
+ static int i;
-#ifdef FWHACK
+ crBegin;
+
+ /* Search for the string "SSH-" in the input. */
i = 0;
- while (s_read(&c, 1) == 1) {
- if (c == 'S' && i < 2) i++;
- else if (c == 'S' && i == 2) i = 2;
- else if (c == 'H' && i == 2) break;
+ while (1) {
+ static const int transS[] = { 1, 2, 2, 1 };
+ static const int transH[] = { 0, 0, 3, 0 };
+ static const int transminus[] = { 0, 0, 0, -1 };
+ if (c == 'S') i = transS[i];
+ else if (c == 'H') i = transH[i];
+ else if (c == '-') i = transminus[i];
else i = 0;
+ if (i < 0)
+ break;
+ crReturn(1); /* get another character */
}
-#else
- if (s_read(&c,1) != 1 || c != 'S') return 0;
- if (s_read(&c,1) != 1 || c != 'S') return 0;
- if (s_read(&c,1) != 1 || c != 'H') return 0;
-#endif
+
strcpy(vstring, "SSH-");
vsp = vstring+4;
- if (s_read(&c,1) != 1 || c != '-') return 0;
i = 0;
while (1) {
- if (s_read(&c,1) != 1)
- return 0;
+ crReturn(1); /* get another char */
if (vsp < vstring+sizeof(vstring)-1)
*vsp++ = c;
if (i >= 0) {
break;
}
+ ssh_agentfwd_enabled = FALSE;
+ rdpkt2_state.incoming_sequence = 0;
+
*vsp = 0;
sprintf(vlog, "Server version: %s", vstring);
vlog[strcspn(vlog, "\r\n")] = '\0';
logevent(vlog);
- if (ssh_versioncmp(version, "2.0" /* FIXME: "1.99" */ ) >= 0) {
+ /*
+ * Server version "1.99" means we can choose whether we use v1
+ * or v2 protocol. Choice is based on cfg.sshprot.
+ */
+ if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) {
/*
* This is a v2 server. Begin v2 protocol.
*/
char *verstring = "SSH-2.0-PuTTY";
- SHA_Init(&exhash);
+ SHA_Init(&exhashbase);
/*
* Hash our version string and their version string.
*/
- sha_string(&exhash, verstring, strlen(verstring));
- sha_string(&exhash, vstring, strcspn(vstring, "\r\n"));
+ sha_string(&exhashbase, verstring, strlen(verstring));
+ sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n"));
sprintf(vstring, "%s\n", verstring);
sprintf(vlog, "We claim version: %s", verstring);
logevent(vlog);
logevent("Using SSH protocol version 2");
- s_write(vstring, strlen(vstring));
+ sk_write(s, vstring, strlen(vstring));
ssh_protocol = ssh2_protocol;
ssh_version = 2;
s_rdpkt = ssh2_rdpkt;
vlog[strcspn(vlog, "\r\n")] = '\0';
logevent(vlog);
logevent("Using SSH protocol version 1");
- s_write(vstring, strlen(vstring));
+ sk_write(s, vstring, strlen(vstring));
ssh_protocol = ssh1_protocol;
ssh_version = 1;
s_rdpkt = ssh1_rdpkt;
}
- ssh_send_ok = 0;
+ ssh_state = SSH_STATE_BEFORE_SIZE;
+
+ crFinish(0);
+}
+
+static void ssh_gotdata(unsigned char *data, int datalen)
+{
+ crBegin;
+
+ /*
+ * To begin with, feed the characters one by one to the
+ * protocol initialisation / selection function do_ssh_init().
+ * When that returns 0, we're done with the initial greeting
+ * exchange and can move on to packet discipline.
+ */
+ while (1) {
+ int ret;
+ if (datalen == 0)
+ crReturnV; /* more data please */
+ ret = do_ssh_init(*data);
+ data++; datalen--;
+ if (ret == 0)
+ break;
+ }
+
+ /*
+ * We emerge from that loop when the initial negotiation is
+ * over and we have selected an s_rdpkt function. Now pass
+ * everything to s_rdpkt, and then pass the resulting packets
+ * to the proper protocol handler.
+ */
+ if (datalen == 0)
+ crReturnV;
+ while (1) {
+ while (datalen > 0) {
+ if ( s_rdpkt(&data, &datalen) == 0 ) {
+ ssh_protocol(NULL, 0, 1);
+ if (ssh_state == SSH_STATE_CLOSED) {
+ return;
+ }
+ }
+ }
+ crReturnV;
+ }
+ crFinishV;
+}
+
+static int ssh_receive(Socket skt, int urgent, char *data, int 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);
+ s = NULL;
+ return 0;
+ }
+ ssh_gotdata (data, len);
+ if (ssh_state == SSH_STATE_CLOSED) {
+ if (s) {
+ sk_close(s);
+ s = NULL;
+ }
+ return 0;
+ }
return 1;
}
/*
+ * Connect to specified host and port.
+ * Returns an error message, or NULL on success.
+ * Also places the canonical host name into `realhost'.
+ */
+static char *connect_to_host(char *host, int port, char **realhost)
+{
+ SockAddr addr;
+ char *err;
+#ifdef FWHACK
+ char *FWhost;
+ int FWport;
+#endif
+
+ savedhost = smalloc(1+strlen(host));
+ if (!savedhost)
+ fatalbox("Out of memory");
+ strcpy(savedhost, host);
+
+ if (port < 0)
+ port = 22; /* default ssh port */
+ savedport = port;
+
+#ifdef FWHACK
+ FWhost = host;
+ FWport = port;
+ host = FWSTR;
+ port = 23;
+#endif
+
+ /*
+ * Try to find host.
+ */
+ addr = sk_namelookup(host, realhost);
+ if ( (err = sk_addr_error(addr)) )
+ return err;
+
+#ifdef FWHACK
+ *realhost = FWhost;
+#endif
+
+ /*
+ * Open socket.
+ */
+ s = sk_new(addr, port, 0, 1, ssh_receive);
+ if ( (err = sk_socket_error(s)) )
+ return err;
+
+#ifdef FWHACK
+ sk_write(s, "connect ", 8);
+ sk_write(s, FWhost, strlen(FWhost));
+ {
+ char buf[20];
+ sprintf(buf, " %d\n", FWport);
+ sk_write(s, buf, strlen(buf));
+ }
+#endif
+
+ return NULL;
+}
+
+/*
* Handle the key exchange and user authentication phases.
*/
static int do_ssh1_login(unsigned char *in, int inlen, int ispkt)
static int tried_publickey;
static unsigned char session_id[16];
int cipher_type;
+ static char username[100];
crBegin;
if (!ispkt) crWaitUntil(ispkt);
- if (pktin.type != SSH1_SMSG_PUBLIC_KEY)
- fatalbox("Public key packet not received");
+ if (pktin.type != SSH1_SMSG_PUBLIC_KEY) {
+ bombout(("Public key packet not received"));
+ crReturn(0);
+ }
logevent("Received public keys");
j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0);
/*
- * Hash the host key and print the hash in the log box. Just as
- * a last resort in case the registry's host key checking is
- * compromised, we'll allow the user some ability to verify
- * host keys by eye.
+ * Log the host key fingerprint.
*/
- MD5Init(&md5c);
- MD5Update(&md5c, keystr2, hostkey.bytes);
- MD5Final(session_id, &md5c);
{
char logmsg[80];
- int i;
- logevent("Host key MD5 is:");
+ logevent("Host key fingerprint is:");
strcpy(logmsg, " ");
- for (i = 0; i < 16; i++)
- sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]);
+ hostkey.comment = NULL;
+ rsa_fingerprint(logmsg+strlen(logmsg), sizeof(logmsg)-strlen(logmsg),
+ &hostkey);
logevent(logmsg);
}
len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes);
- rsabuf = malloc(len);
+ rsabuf = smalloc(len);
if (!rsabuf)
fatalbox("Out of memory");
* First format the key into a string.
*/
int len = rsastr_len(&hostkey);
- char *keystr = malloc(len);
+ char fingerprint[100];
+ char *keystr = smalloc(len);
if (!keystr)
fatalbox("Out of memory");
rsastr_fmt(keystr, &hostkey);
- verify_ssh_host_key(savedhost, keystr);
- free(keystr);
+ rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey);
+ verify_ssh_host_key(savedhost, savedport, "rsa", keystr, fingerprint);
+ sfree(keystr);
}
for (i=0; i<32; i++) {
logevent("Trying to enable encryption...");
- free(rsabuf);
+ sfree(rsabuf);
- cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish :
+ cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 :
cipher_type == SSH_CIPHER_DES ? &ssh_des :
&ssh_3des;
cipher->sesskey(session_key);
crWaitUntil(ispkt);
- if (pktin.type != SSH1_SMSG_SUCCESS)
- fatalbox("Encryption not successfully enabled");
+ if (pktin.type != SSH1_SMSG_SUCCESS) {
+ bombout(("Encryption not successfully enabled"));
+ crReturn(0);
+ }
logevent("Successfully started encryption");
fflush(stdout);
{
- static char username[100];
static int pos = 0;
static char c;
- if (!(flags & FLAG_CONNECTION) && !*cfg.username) {
+ if ((flags & FLAG_INTERACTIVE) && !*cfg.username) {
c_write("login as: ", 10);
+ ssh_send_ok = 1;
while (pos >= 0) {
crWaitUntil(!ispkt);
while (inlen--) switch (c = *in++) {
c_write("\r\n", 2);
username[strcspn(username, "\n\r")] = '\0';
} else {
- char stuff[200];
strncpy(username, cfg.username, 99);
username[99] = '\0';
- if (flags & FLAG_VERBOSE) {
- sprintf(stuff, "Sent username \"%s\".\r\n", username);
- c_write(stuff, strlen(stuff));
- }
}
send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END);
{
- char userlog[20+sizeof(username)];
+ char userlog[22+sizeof(username)];
sprintf(userlog, "Sent username \"%s\"", username);
logevent(userlog);
+ if (flags & FLAG_INTERACTIVE &&
+ (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) {
+ strcat(userlog, "\r\n");
+ c_write(userlog, strlen(userlog));
+ }
}
}
while (pktin.type == SSH1_SMSG_FAILURE) {
static char password[100];
+ static char prompt[200];
static int pos;
static char c;
static int pwpkt_type;
/*
* Show password prompt, having first obtained it via a TIS
- * exchange if we're doing TIS authentication.
+ * or CryptoCard exchange if we're doing TIS or CryptoCard
+ * authentication.
*/
pwpkt_type = SSH1_CMSG_AUTH_PASSWORD;
+ if (agent_exists()) {
+ /*
+ * Attempt RSA authentication using Pageant.
+ */
+ static unsigned char request[5], *response, *p;
+ static int responselen;
+ static int i, nkeys;
+ static int authed = FALSE;
+ void *r;
+
+ logevent("Pageant is running. Requesting keys.");
+
+ /* Request the keys held by the agent. */
+ PUT_32BIT(request, 1);
+ request[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
+ agent_query(request, 5, &r, &responselen);
+ response = (unsigned char *)r;
+ if (response) {
+ p = response + 5;
+ nkeys = GET_32BIT(p); p += 4;
+ { char buf[64]; sprintf(buf, "Pageant has %d keys", nkeys);
+ logevent(buf); }
+ for (i = 0; i < nkeys; i++) {
+ static struct RSAKey key;
+ static Bignum challenge;
+ static char *commentp;
+ static int commentlen;
+
+ { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i);
+ logevent(buf); }
+ p += 4;
+ p += ssh1_read_bignum(p, &key.exponent);
+ p += ssh1_read_bignum(p, &key.modulus);
+ commentlen = GET_32BIT(p); p += 4;
+ commentp = p; p += commentlen;
+ send_packet(SSH1_CMSG_AUTH_RSA,
+ PKT_BIGNUM, key.modulus, PKT_END);
+ crWaitUntil(ispkt);
+ if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) {
+ logevent("Key refused");
+ continue;
+ }
+ logevent("Received RSA challenge");
+ ssh1_read_bignum(pktin.body, &challenge);
+ {
+ char *agentreq, *q, *ret;
+ int len, retlen;
+ len = 1 + 4; /* message type, bit count */
+ len += ssh1_bignum_length(key.exponent);
+ len += ssh1_bignum_length(key.modulus);
+ len += ssh1_bignum_length(challenge);
+ len += 16; /* session id */
+ len += 4; /* response format */
+ agentreq = smalloc(4 + len);
+ PUT_32BIT(agentreq, len);
+ q = agentreq + 4;
+ *q++ = SSH_AGENTC_RSA_CHALLENGE;
+ PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus));
+ q += 4;
+ q += ssh1_write_bignum(q, key.exponent);
+ q += ssh1_write_bignum(q, key.modulus);
+ q += ssh1_write_bignum(q, challenge);
+ memcpy(q, session_id, 16); q += 16;
+ PUT_32BIT(q, 1); /* response format */
+ agent_query(agentreq, len+4, &ret, &retlen);
+ sfree(agentreq);
+ if (ret) {
+ if (ret[4] == SSH_AGENT_RSA_RESPONSE) {
+ logevent("Sending Pageant's response");
+ send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE,
+ PKT_DATA, ret+5, 16, PKT_END);
+ sfree(ret);
+ crWaitUntil(ispkt);
+ if (pktin.type == SSH1_SMSG_SUCCESS) {
+ logevent("Pageant's response accepted");
+ if (flags & FLAG_VERBOSE) {
+ c_write("Authenticated using RSA key \"",
+ 29);
+ c_write(commentp, commentlen);
+ c_write("\" from agent\r\n", 14);
+ }
+ authed = TRUE;
+ } else
+ logevent("Pageant's response not accepted");
+ } else {
+ logevent("Pageant failed to answer challenge");
+ sfree(ret);
+ }
+ } else {
+ logevent("No reply received from Pageant");
+ }
+ }
+ freebn(key.exponent);
+ freebn(key.modulus);
+ freebn(challenge);
+ if (authed)
+ break;
+ }
+ }
+ if (authed)
+ break;
+ }
if (*cfg.keyfile && !tried_publickey)
pwpkt_type = SSH1_CMSG_AUTH_RSA;
- if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD && !FLAG_WINDOWED) {
- char prompt[200];
- sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost);
+ if (pktin.type == SSH1_SMSG_FAILURE &&
+ cfg.try_tis_auth &&
+ (supported_auths_mask & (1<<SSH1_AUTH_TIS))) {
+ pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE;
+ logevent("Requested TIS authentication");
+ send_packet(SSH1_CMSG_AUTH_TIS, PKT_END);
+ crWaitUntil(ispkt);
+ if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) {
+ logevent("TIS authentication declined");
+ if (flags & FLAG_INTERACTIVE)
+ c_write("TIS authentication refused.\r\n", 29);
+ } else {
+ int challengelen = ((pktin.body[0] << 24) |
+ (pktin.body[1] << 16) |
+ (pktin.body[2] << 8) |
+ (pktin.body[3]));
+ logevent("Received TIS challenge");
+ if (challengelen > sizeof(prompt)-1)
+ challengelen = sizeof(prompt)-1; /* prevent overrun */
+ memcpy(prompt, pktin.body+4, challengelen);
+ prompt[challengelen] = '\0';
+ }
+ }
+ if (pktin.type == SSH1_SMSG_FAILURE &&
+ cfg.try_tis_auth &&
+ (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) {
+ pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE;
+ logevent("Requested CryptoCard authentication");
+ send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END);
+ crWaitUntil(ispkt);
+ if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) {
+ logevent("CryptoCard authentication declined");
+ c_write("CryptoCard authentication refused.\r\n", 29);
+ } else {
+ int challengelen = ((pktin.body[0] << 24) |
+ (pktin.body[1] << 16) |
+ (pktin.body[2] << 8) |
+ (pktin.body[3]));
+ logevent("Received CryptoCard challenge");
+ if (challengelen > sizeof(prompt)-1)
+ challengelen = sizeof(prompt)-1; /* prevent overrun */
+ memcpy(prompt, pktin.body+4, challengelen);
+ strncpy(prompt + challengelen, "\r\nResponse : ",
+ sizeof(prompt)-challengelen);
+ prompt[sizeof(prompt)-1] = '\0';
+ }
+ }
+ if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) {
+ sprintf(prompt, "%.90s@%.90s's password: ",
+ username, savedhost);
+ }
+ if (pwpkt_type == SSH1_CMSG_AUTH_RSA) {
+ char *comment = NULL;
+ if (flags & FLAG_VERBOSE)
+ c_write("Trying public key authentication.\r\n", 35);
+ if (!rsakey_encrypted(cfg.keyfile, &comment)) {
+ if (flags & FLAG_VERBOSE)
+ c_write("No passphrase required.\r\n", 25);
+ goto tryauth;
+ }
+ sprintf(prompt, "Passphrase for key \"%.100s\": ", comment);
+ sfree(comment);
+ }
+
+ if (ssh_get_password) {
if (!ssh_get_password(prompt, password, sizeof(password))) {
/*
* get_password failed to get a password (for
crReturn(1);
}
} else {
-
- if (pktin.type == SSH1_SMSG_FAILURE &&
- cfg.try_tis_auth &&
- (supported_auths_mask & (1<<SSH1_AUTH_TIS))) {
- pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE;
- logevent("Requested TIS authentication");
- send_packet(SSH1_CMSG_AUTH_TIS, PKT_END);
- crWaitUntil(ispkt);
- if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) {
- logevent("TIS authentication declined");
- c_write("TIS authentication refused.\r\n", 29);
- } else {
- int challengelen = ((pktin.body[0] << 24) |
- (pktin.body[1] << 16) |
- (pktin.body[2] << 8) |
- (pktin.body[3]));
- logevent("Received TIS challenge");
- c_write(pktin.body+4, challengelen);
- }
- }
- if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD)
- c_write("password: ", 10);
- if (pwpkt_type == SSH1_CMSG_AUTH_RSA) {
- if (flags & FLAG_VERBOSE)
- c_write("Trying public key authentication.\r\n", 35);
- if (!rsakey_encrypted(cfg.keyfile)) {
- if (flags & FLAG_VERBOSE)
- c_write("No passphrase required.\r\n", 25);
- goto tryauth;
- }
- c_write("passphrase: ", 12);
- }
-
+ c_write(prompt, strlen(prompt));
pos = 0;
+ ssh_send_ok = 1;
while (pos >= 0) {
crWaitUntil(!ispkt);
while (inlen--) switch (c = *in++) {
}
}
c_write("\r\n", 2);
-
- }
+ }
tryauth:
if (pwpkt_type == SSH1_CMSG_AUTH_RSA) {
static unsigned char buffer[32];
tried_publickey = 1;
- i = loadrsakey(cfg.keyfile, &pubkey, password);
+ i = loadrsakey(cfg.keyfile, &pubkey, NULL, password);
if (i == 0) {
c_write("Couldn't load public key from ", 30);
c_write(cfg.keyfile, strlen(cfg.keyfile));
crWaitUntil(ispkt);
if (pktin.type == SSH1_SMSG_FAILURE) {
- if (flags & FLAG_VERBOSE)
- c_write("Server refused our public key.\r\n", 32);
+ c_write("Server refused our public key.\r\n", 32);
continue; /* go and try password */
}
- if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE)
- fatalbox("Bizarre response to offer of public key");
+ if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) {
+ bombout(("Bizarre response to offer of public key"));
+ crReturn(0);
+ }
ssh1_read_bignum(pktin.body, &challenge);
response = rsadecrypt(challenge, &pubkey);
freebn(pubkey.private_exponent); /* burn the evidence */
45);
continue; /* go and try password */
} else if (pktin.type != SSH1_SMSG_SUCCESS) {
- fatalbox("Bizarre response to RSA authentication response");
+ bombout(("Bizarre response to RSA authentication response"));
+ crReturn(0);
}
break; /* we're through! */
ssh_state = SSH_STATE_CLOSED;
crReturn(1);
} else if (pktin.type != SSH1_SMSG_SUCCESS) {
- fatalbox("Strange packet received, type %d", pktin.type);
+ bombout(("Strange packet received, type %d", pktin.type));
+ crReturn(0);
}
}
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 (ssh_state == SSH_STATE_CLOSED)
crReturnV;
+ if (cfg.agentfwd && agent_exists()) {
+ logevent("Requesting agent forwarding");
+ send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, 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("Agent forwarding refused");
+ } else {
+ logevent("Agent forwarding enabled");
+ ssh_agentfwd_enabled = TRUE;
+ }
+ }
+
+ 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,
ssh_state = SSH_STATE_INTERMED;
do { crReturnV; } while (!ispkt);
if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) {
- fatalbox("Protocol confusion");
+ bombout(("Protocol confusion"));
+ 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) {
+ send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END);
+ do { crReturnV; } while (!ispkt);
+ if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) {
+ bombout(("Protocol confusion"));
+ crReturnV;
+ } else if (pktin.type == SSH1_SMSG_FAILURE) {
+ c_write("Server refused to compress\r\n", 32);
+ }
+ logevent("Started compression");
+ ssh1_compressing = TRUE;
+ zlib_compress_init();
+ zlib_decompress_init();
}
if (*cfg.remote_cmd)
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);
while (1) {
crReturnV;
if (ispkt) {
if (pktin.type == SSH1_SMSG_STDOUT_DATA ||
pktin.type == SSH1_SMSG_STDERR_DATA) {
long len = GET_32BIT(pktin.body);
- c_write(pktin.body+4, len);
+ from_backend(pktin.type == SSH1_SMSG_STDERR_DATA,
+ pktin.body+4, len);
} else if (pktin.type == SSH1_MSG_DISCONNECT) {
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. */
+ unsigned i;
+ struct ssh_channel *c;
+ enum234 e;
+
+ /* Refuse if agent forwarding is disabled. */
+ if (!ssh_agentfwd_enabled) {
+ send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE,
+ PKT_INT, GET_32BIT(pktin.body),
+ PKT_END);
+ } else {
+ i = 1;
+ for (c = first234(ssh_channels, &e); c; c = next234(&e)) {
+ if (c->localid > i)
+ break; /* found a free number */
+ i = c->localid + 1;
+ }
+ c = smalloc(sizeof(struct ssh_channel));
+ c->remoteid = GET_32BIT(pktin.body);
+ c->localid = i;
+ c->closes = 0;
+ c->type = CHAN_AGENT; /* identify channel type */
+ c->u.a.lensofar = 0;
+ add234(ssh_channels, c);
+ send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION,
+ PKT_INT, c->remoteid, PKT_INT, c->localid,
+ PKT_END);
+ }
+ } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE ||
+ pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) {
+ /* Remote side closes a channel. */
+ unsigned i = GET_32BIT(pktin.body);
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (c) {
+ 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);
+ sfree(c);
+ }
+ }
+ } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) {
+ /* Data sent down one of our channels. */
+ int i = GET_32BIT(pktin.body);
+ int len = GET_32BIT(pktin.body+4);
+ unsigned char *p = pktin.body+8;
+ struct ssh_channel *c;
+ c = find234(ssh_channels, &i, ssh_channelfind);
+ if (c) {
+ switch(c->type) {
+ 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) {
+ int l = min(4 - c->u.a.lensofar, len);
+ memcpy(c->u.a.msglen + c->u.a.lensofar, p, l);
+ p += l; len -= l; c->u.a.lensofar += l;
+ }
+ if (c->u.a.lensofar == 4) {
+ c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen);
+ c->u.a.message = smalloc(c->u.a.totallen);
+ memcpy(c->u.a.message, c->u.a.msglen, 4);
+ }
+ if (c->u.a.lensofar >= 4 && len > 0) {
+ int l = min(c->u.a.totallen - c->u.a.lensofar, len);
+ memcpy(c->u.a.message + c->u.a.lensofar, p, l);
+ p += l; len -= l; c->u.a.lensofar += l;
+ }
+ if (c->u.a.lensofar == c->u.a.totallen) {
+ void *reply, *sentreply;
+ int replylen;
+ agent_query(c->u.a.message, c->u.a.totallen,
+ &reply, &replylen);
+ if (reply)
+ sentreply = reply;
+ else {
+ /* Fake SSH_AGENT_FAILURE. */
+ sentreply = "\0\0\0\1\5";
+ replylen = 5;
+ }
+ send_packet(SSH1_MSG_CHANNEL_DATA,
+ PKT_INT, c->remoteid,
+ PKT_INT, replylen,
+ PKT_DATA, sentreply, replylen,
+ PKT_END);
+ if (reply)
+ sfree(reply);
+ sfree(c->u.a.message);
+ c->u.a.lensofar = 0;
+ }
+ }
+ break;
+ }
+ }
} else if (pktin.type == SSH1_SMSG_SUCCESS) {
/* may be from EXEC_SHELL on some servers */
} else if (pktin.type == SSH1_SMSG_FAILURE) {
} else if (pktin.type == SSH1_SMSG_EXIT_STATUS) {
send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END);
} else {
- fatalbox("Strange packet received: type %d", pktin.type);
+ bombout(("Strange packet received: type %d", pktin.type));
+ crReturnV;
}
} else {
- send_packet(SSH1_CMSG_STDIN_DATA,
- PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END);
+ while (inlen > 0) {
+ int len = min(inlen, 512);
+ send_packet(SSH1_CMSG_STDIN_DATA,
+ PKT_INT, len, PKT_DATA, in, len, PKT_END);
+ in += len;
+ inlen -= len;
+ }
}
}
/*
* Utility routine for decoding comma-separated strings in KEXINIT.
*/
-int in_commasep_string(char *needle, char *haystack, int haylen) {
+static int in_commasep_string(char *needle, char *haystack, int haylen) {
int needlen = strlen(needle);
while (1) {
/*
/*
* SSH2 key creation method.
*/
-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 i, len;
static char *str;
static Bignum e, f, K;
- static struct ssh_cipher *cscipher_tobe = NULL;
- static struct ssh_cipher *sccipher_tobe = NULL;
- static struct ssh_mac *csmac_tobe = NULL;
- static struct ssh_mac *scmac_tobe = NULL;
- static struct ssh_compress *cscomp_tobe = NULL;
- static struct ssh_compress *sccomp_tobe = NULL;
- static char *hostkeydata, *sigdata, *keystr;
+ static const struct ssh_mac **maclist;
+ static int nmacs;
+ static const struct ssh_cipher *cscipher_tobe = NULL;
+ static const struct ssh_cipher *sccipher_tobe = NULL;
+ static const struct ssh_mac *csmac_tobe = NULL;
+ static const struct ssh_mac *scmac_tobe = NULL;
+ static const struct ssh_compress *cscomp_tobe = NULL;
+ static const struct ssh_compress *sccomp_tobe = NULL;
+ static char *hostkeydata, *sigdata, *keystr, *fingerprint;
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 ssh_compress *preferred_comp;
+ static int first_kex;
crBegin;
random_init();
+ first_kex = 1;
+
+ /*
+ * Set up the preferred cipher and compression.
+ */
+ if (cfg.cipher == CIPHER_BLOWFISH) {
+ preferred_cipher = &ssh_blowfish_ssh2;
+ } else if (cfg.cipher == CIPHER_DES) {
+ logevent("Single DES not supported in SSH2; using 3DES");
+ preferred_cipher = &ssh_3des_ssh2;
+ } else if (cfg.cipher == CIPHER_3DES) {
+ preferred_cipher = &ssh_3des_ssh2;
+ } else {
+ /* Shouldn't happen, but we do want to initialise to _something_. */
+ preferred_cipher = &ssh_3des_ssh2;
+ }
+ if (cfg.compression)
+ preferred_comp = &ssh_zlib;
+ else
+ preferred_comp = &ssh_comp_none;
+
+ /*
+ * Be prepared to work around the buggy MAC problem.
+ */
+ if (cfg.buggymac)
+ maclist = buggymacs, nmacs = lenof(buggymacs);
+ else
+ maclist = macs, nmacs = lenof(macs);
begin_key_exchange:
/*
}
/* List client->server encryption algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(ciphers); i++) {
- ssh2_pkt_addstring_str(ciphers[i]->name);
- if (i < lenof(ciphers)-1)
+ 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(",");
}
/* List server->client encryption algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(ciphers); i++) {
- ssh2_pkt_addstring_str(ciphers[i]->name);
- if (i < lenof(ciphers)-1)
+ 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(",");
}
/* List client->server MAC algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(macs); i++) {
- ssh2_pkt_addstring_str(macs[i]->name);
- if (i < lenof(macs)-1)
+ for (i = 0; i < nmacs; i++) {
+ ssh2_pkt_addstring_str(maclist[i]->name);
+ if (i < nmacs-1)
ssh2_pkt_addstring_str(",");
}
/* List server->client MAC algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(macs); i++) {
- ssh2_pkt_addstring_str(macs[i]->name);
- if (i < lenof(macs)-1)
+ for (i = 0; i < nmacs; i++) {
+ ssh2_pkt_addstring_str(maclist[i]->name);
+ if (i < nmacs-1)
ssh2_pkt_addstring_str(",");
}
/* List client->server compression algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(compressions); i++) {
- ssh2_pkt_addstring_str(compressions[i]->name);
- if (i < lenof(compressions)-1)
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ ssh2_pkt_addstring_str(c->name);
+ if (i < lenof(compressions))
ssh2_pkt_addstring_str(",");
}
/* List server->client compression algorithms. */
ssh2_pkt_addstring_start();
- for (i = 0; i < lenof(compressions); i++) {
- ssh2_pkt_addstring_str(compressions[i]->name);
- if (i < lenof(compressions)-1)
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ ssh2_pkt_addstring_str(c->name);
+ if (i < lenof(compressions))
ssh2_pkt_addstring_str(",");
}
/* List client->server languages. Empty list. */
ssh2_pkt_addbool(FALSE);
/* Reserved. */
ssh2_pkt_adduint32(0);
+
+ exhash = exhashbase;
sha_string(&exhash, pktout.data+5, pktout.length-5);
+
ssh2_pkt_send();
if (!ispkt) crWaitUntil(ispkt);
* to.
*/
if (pktin.type != SSH2_MSG_KEXINIT) {
- fatalbox("expected key exchange packet from server");
+ bombout(("expected key exchange packet from server"));
+ crReturn(0);
}
kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL;
csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL;
}
}
ssh2_pkt_getstring(&str, &len); /* client->server cipher */
- for (i = 0; i < lenof(ciphers); i++) {
- if (in_commasep_string(ciphers[i]->name, str, len)) {
- cscipher_tobe = ciphers[i];
+ 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;
}
}
ssh2_pkt_getstring(&str, &len); /* server->client cipher */
- for (i = 0; i < lenof(ciphers); i++) {
- if (in_commasep_string(ciphers[i]->name, str, len)) {
- sccipher_tobe = ciphers[i];
+ 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;
}
}
ssh2_pkt_getstring(&str, &len); /* client->server mac */
- for (i = 0; i < lenof(macs); i++) {
- if (in_commasep_string(macs[i]->name, str, len)) {
- csmac_tobe = macs[i];
+ for (i = 0; i < nmacs; i++) {
+ if (in_commasep_string(maclist[i]->name, str, len)) {
+ csmac_tobe = maclist[i];
break;
}
}
ssh2_pkt_getstring(&str, &len); /* server->client mac */
- for (i = 0; i < lenof(macs); i++) {
- if (in_commasep_string(macs[i]->name, str, len)) {
- scmac_tobe = macs[i];
+ for (i = 0; i < nmacs; i++) {
+ if (in_commasep_string(maclist[i]->name, str, len)) {
+ scmac_tobe = maclist[i];
break;
}
}
ssh2_pkt_getstring(&str, &len); /* client->server compression */
- for (i = 0; i < lenof(compressions); i++) {
- if (in_commasep_string(compressions[i]->name, str, len)) {
- cscomp_tobe = compressions[i];
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ if (in_commasep_string(c->name, str, len)) {
+ cscomp_tobe = c;
break;
}
}
ssh2_pkt_getstring(&str, &len); /* server->client compression */
- for (i = 0; i < lenof(compressions); i++) {
- if (in_commasep_string(compressions[i]->name, str, len)) {
- sccomp_tobe = compressions[i];
+ for (i = 0; i < lenof(compressions)+1; i++) {
+ const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1];
+ if (in_commasep_string(c->name, str, len)) {
+ sccomp_tobe = c;
break;
}
}
* Currently we only support Diffie-Hellman and DSS, so let's
* bomb out if those aren't selected.
*/
- if (kex != &ssh_diffiehellman || hostkey != &ssh_dss)
- fatalbox("internal fault: chaos in SSH 2 transport layer");
+ if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) {
+ bombout(("internal fault: chaos in SSH 2 transport layer"));
+ crReturn(0);
+ }
/*
* Now we begin the fun. Generate and send e for Diffie-Hellman.
crWaitUntil(ispkt);
if (pktin.type != SSH2_MSG_KEXDH_REPLY) {
- fatalbox("expected key exchange packet from server");
+ bombout(("expected key exchange packet from server"));
+ crReturn(0);
}
ssh2_pkt_getstring(&hostkeydata, &hostkeylen);
f = ssh2_pkt_getmp();
debug(("\r\n"));
#endif
- hostkey->setkey(hostkeydata, hostkeylen);
- if (!hostkey->verifysig(sigdata, siglen, exchange_hash, 20))
- fatalbox("Server failed host key check");
+ hkey = hostkey->newkey(hostkeydata, hostkeylen);
+ if (!hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) {
+ bombout(("Server failed host key check"));
+ crReturn(0);
+ }
/*
* Expect SSH2_MSG_NEWKEYS from server.
*/
crWaitUntil(ispkt);
- if (pktin.type != SSH2_MSG_NEWKEYS)
- fatalbox("expected new-keys packet from server");
+ if (pktin.type != SSH2_MSG_NEWKEYS) {
+ bombout(("expected new-keys packet from server"));
+ crReturn(0);
+ }
/*
* Authenticate remote host: verify host key. (We've already
* checked the signature of the exchange hash.)
*/
- keystr = hostkey->fmtkey();
- verify_ssh_host_key(savedhost, keystr);
- free(keystr);
+ keystr = hostkey->fmtkey(hkey);
+ fingerprint = hostkey->fingerprint(hkey);
+ verify_ssh_host_key(savedhost, savedport, hostkey->keytype,
+ keystr, 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);
/*
* Send SSH2_MSG_NEWKEYS.
scmac = scmac_tobe;
cscomp = cscomp_tobe;
sccomp = sccomp_tobe;
+ cscomp->compress_init();
+ sccomp->decompress_init();
+ /*
+ * Set IVs after keys. Here we use the exchange hash from the
+ * _first_ key exchange.
+ */
+ 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);
+
/*
- * Set IVs after keys.
+ * If this is the first key exchange phase, we must pass the
+ * SSH2_MSG_NEWKEYS packet to the next layer, not because it
+ * wants to see it but because it will need time to initialise
+ * itself before it sees an actual packet. In subsequent key
+ * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because
+ * it would only confuse the layer above.
*/
- 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) {
+ crReturn(0);
+ }
+ first_kex = 0;
/*
* Now we're encrypting. Begin returning 1 to the protocol main
* 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);
}
/*
- * SSH2: remote identifier for the main session channel.
+ * 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 unsigned long ssh_remote_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.
ssh2_pkt_addstring("ssh-userauth");
ssh2_pkt_send();
crWaitUntilV(ispkt);
- if (pktin.type != SSH2_MSG_SERVICE_ACCEPT)
- fatalbox("Server refused user authentication protocol");
+ if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) {
+ bombout(("Server refused user authentication protocol"));
+ crReturnV;
+ }
/*
* FIXME: currently we support only password authentication.
static int pos = 0;
static char c;
- if ((flags & FLAG_CONNECTION) && !*cfg.username) {
+ if ((flags & FLAG_INTERACTIVE) && !*cfg.username) {
c_write("login as: ", 10);
+ ssh_send_ok = 1;
while (pos >= 0) {
crWaitUntilV(!ispkt);
while (inlen--) switch (c = *in++) {
char stuff[200];
strncpy(username, cfg.username, 99);
username[99] = '\0';
- if (flags & FLAG_VERBOSE) {
+ if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) {
sprintf(stuff, "Using username \"%s\".\r\n", username);
c_write(stuff, strlen(stuff));
}
}
- if (!(flags & FLAG_WINDOWED)) {
+ if (ssh_get_password) {
char prompt[200];
- sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost);
+ sprintf(prompt, "%.90s@%.90s's password: ", username, savedhost);
if (!ssh_get_password(prompt, password, sizeof(password))) {
/*
* get_password failed to get a password (for
}
} else {
c_write("password: ", 10);
+ ssh_send_ok = 1;
pos = 0;
while (pos >= 0) {
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) {
/*
* So now create a channel with a session in it.
*/
+ mainchan = smalloc(sizeof(struct ssh_channel));
+ mainchan->localid = 100; /* as good as any */
ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN);
ssh2_pkt_addstring("session");
- ssh2_pkt_adduint32(100); /* as good as any */
- ssh2_pkt_adduint32(0xFFFFFFFFUL); /* very big window which we ignore */
- ssh2_pkt_adduint32(0xFFFFFFFFUL); /* very big max pkt size */
+ ssh2_pkt_adduint32(mainchan->localid);
+ ssh2_pkt_adduint32(0x8000UL); /* our window size */
+ ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */
ssh2_pkt_send();
crWaitUntilV(ispkt);
if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) {
- fatalbox("Server refused to open a session");
+ bombout(("Server refused to open a session"));
+ crReturnV;
/* FIXME: error data comes back in FAILURE packet */
}
- if (ssh2_pkt_getuint32() != 100) {
- fatalbox("Server's channel confirmation cited wrong channel");
+ if (ssh2_pkt_getuint32() != mainchan->localid) {
+ bombout(("Server's channel confirmation cited wrong channel"));
+ crReturnV;
}
- ssh_remote_channel = ssh2_pkt_getuint32();
- remote_winsize = ssh2_pkt_getuint32();
- remote_maxpkt = ssh2_pkt_getuint32();
+ mainchan->remoteid = ssh2_pkt_getuint32();
+ 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.
*/
- ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
- ssh2_pkt_adduint32(ssh_remote_channel); /* recipient channel */
- ssh2_pkt_addstring("pty-req");
- ssh2_pkt_addbool(1); /* want reply */
- ssh2_pkt_addstring(cfg.termtype);
- ssh2_pkt_adduint32(cols);
- ssh2_pkt_adduint32(rows);
- ssh2_pkt_adduint32(0); /* pixel width */
- ssh2_pkt_adduint32(0); /* pixel height */
- ssh2_pkt_addstring_start();
- ssh2_pkt_addstring_data("\0", 1); /* TTY_OP_END, no special options */
- ssh2_pkt_send();
+ if (!cfg.nopty) {
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
+ ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */
+ ssh2_pkt_addstring("pty-req");
+ ssh2_pkt_addbool(1); /* want reply */
+ ssh2_pkt_addstring(cfg.termtype);
+ ssh2_pkt_adduint32(cols);
+ ssh2_pkt_adduint32(rows);
+ ssh2_pkt_adduint32(0); /* pixel width */
+ ssh2_pkt_adduint32(0); /* pixel height */
+ ssh2_pkt_addstring_start();
+ ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */
+ ssh2_pkt_send();
+ ssh_state = SSH_STATE_INTERMED;
- do { /* FIXME: pay attention to these */
- crWaitUntilV(ispkt);
- } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+ 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) {
- fatalbox("Server got confused by pty request");
+ if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) {
+ if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) {
+ bombout(("Server got confused by pty request"));
+ crReturnV;
+ }
+ c_write("Server refused to allocate pty\r\n", 32);
+ ssh_editing = ssh_echoing = 1;
+ } else {
+ logevent("Allocated pty");
}
- c_write("Server refused to allocate pty\r\n", 32);
} else {
- logevent("Allocated pty");
+ ssh_editing = ssh_echoing = 1;
}
/*
- * Start a shell.
+ * Start a shell or a remote command.
*/
ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
- ssh2_pkt_adduint32(ssh_remote_channel); /* recipient channel */
- ssh2_pkt_addstring("shell");
- ssh2_pkt_addbool(1); /* want reply */
+ ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */
+ 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);
+ } else {
+ ssh2_pkt_addstring("shell");
+ ssh2_pkt_addbool(1); /* want reply */
+ }
ssh2_pkt_send();
- do { /* FIXME: pay attention to these */
+ 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) {
- fatalbox("Server got confused by shell request");
+ bombout(("Server got confused by shell/command request"));
+ crReturnV;
}
- fatalbox("Server refused to start a shell");
+ bombout(("Server refused to start a shell/command"));
+ crReturnV;
} else {
- logevent("Started a shell");
+ logevent("Started a shell/command");
}
+ 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;
while (1) {
+ static int try_send;
crReturnV;
+ try_send = FALSE;
if (ispkt) {
if (pktin.type == SSH2_MSG_CHANNEL_DATA ||
pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) {
char *data;
int length;
- if (ssh2_pkt_getuint32() != 100)
- 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)
- c_write(data, length);
+ if (data) {
+ 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.
+ */
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+ ssh2_pkt_adduint32(c->remoteid);
+ ssh2_pkt_adduint32(length);
+ ssh2_pkt_send();
+ }
} else if (pktin.type == SSH2_MSG_DISCONNECT) {
ssh_state = SSH_STATE_CLOSED;
- logevent("Received disconnect request");
+ logevent("Received disconnect message");
+ crReturnV;
} else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) {
continue; /* exit status et al; ignore (FIXME?) */
+ } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) {
+ 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) {
+ 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);
+ ssh2_pkt_addstring("All open channels closed");
+ ssh2_pkt_addstring("en"); /* language tag */
+ ssh2_pkt_send();
+ ssh_state = SSH_STATE_CLOSED;
+ crReturnV;
+ }
+ continue; /* remote sends close; ignore (FIXME) */
} else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) {
- continue; /* ignore for now (FIXME!) */
+ 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 {
- fatalbox("Strange packet received: type %d", pktin.type);
+ bombout(("Strange packet received: type %d", pktin.type));
+ crReturnV;
}
} else {
- /* FIXME: for now, ignore window size */
- ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA);
- ssh2_pkt_adduint32(ssh_remote_channel);
- ssh2_pkt_addstring_start();
- ssh2_pkt_addstring_data(in, inlen);
- ssh2_pkt_send();
+ /*
+ * We have spare data. Add it to the channel buffer.
+ */
+ ssh2_add_channel_data(mainchan, in, inlen);
+ try_send = TRUE;
}
+ if (try_send) {
+ enum234 e;
+ struct ssh_channel *c;
+ /*
+ * Try to send data on all channels if we can.
+ */
+ for (c = first234(ssh_channels, &e); c; c = next234(&e))
+ ssh2_try_send(c);
+ }
}
crFinishV;
}
/*
- * Called to set up the connection. Will arrange for WM_NETEVENT
- * messages to be passed to the specified window, whose window
- * procedure should then call telnet_msg().
+ * Called to set up the connection.
*
* Returns an error message, or NULL on success.
*/
-static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) {
+static char *ssh_init (char *host, int port, char **realhost) {
char *p;
#ifdef MSCRYPTOAPI
return "Microsoft high encryption pack not installed!";
#endif
+ ssh_send_ok = 0;
+ ssh_editing = 0;
+ ssh_echoing = 0;
+
p = connect_to_host(host, port, realhost);
if (p != NULL)
return p;
- if (!do_ssh_init())
- return "Protocol initialisation error";
-
- if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- default: return "WSAAsyncSelect(): unknown error";
- }
-
return NULL;
}
/*
- * Process a WM_NETEVENT message. Will return 0 if the connection
- * has closed, or <0 for a socket error.
- */
-static int ssh_msg (WPARAM wParam, LPARAM lParam) {
- int ret;
- char buf[256];
-
- /*
- * Because reading less than the whole of the available pending
- * data can generate an FD_READ event, we need to allow for the
- * possibility that FD_READ may arrive with FD_CLOSE already in
- * the queue; so it's possible that we can get here even with s
- * invalid. If so, we return 1 and don't worry about it.
- */
- if (s == INVALID_SOCKET)
- return 1;
-
- if (WSAGETSELECTERROR(lParam) != 0)
- return -WSAGETSELECTERROR(lParam);
-
- switch (WSAGETSELECTEVENT(lParam)) {
- case FD_READ:
- case FD_CLOSE:
- ret = recv(s, buf, sizeof(buf), 0);
- if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
- return 1;
- if (ret < 0) /* any _other_ error */
- return -10000-WSAGetLastError();
- if (ret == 0) {
- s = INVALID_SOCKET;
- return 0;
- }
- ssh_gotdata (buf, ret);
- if (ssh_state == SSH_STATE_CLOSED) {
- closesocket(s);
- s = INVALID_SOCKET;
- return 0;
- }
- return 1;
- }
- return 1; /* shouldn't happen, but WTF */
-}
-
-/*
* Called to send data down the Telnet connection.
*/
static void ssh_send (char *buf, int len) {
- if (s == INVALID_SOCKET)
+ if (s == NULL || ssh_protocol == NULL)
return;
ssh_protocol(buf, len, 0);
}
/*
- * Called to set the size of the window from Telnet's POV.
+ * Called to set the size of the window from SSH's POV.
*/
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:
break;
case SSH_STATE_SESSION:
if (!cfg.nopty) {
- send_packet(SSH1_CMSG_WINDOW_SIZE,
- PKT_INT, rows, PKT_INT, cols,
- PKT_INT, 0, PKT_INT, 0, PKT_END);
+ if (ssh_version == 1) {
+ send_packet(SSH1_CMSG_WINDOW_SIZE,
+ PKT_INT, rows, PKT_INT, cols,
+ PKT_INT, 0, PKT_INT, 0, PKT_END);
+ } else {
+ ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);
+ ssh2_pkt_adduint32(mainchan->remoteid);
+ ssh2_pkt_addstring("window-change");
+ ssh2_pkt_addbool(0);
+ ssh2_pkt_adduint32(cols);
+ ssh2_pkt_adduint32(rows);
+ ssh2_pkt_adduint32(0);
+ ssh2_pkt_adduint32(0);
+ ssh2_pkt_send();
+ }
}
+ break;
}
}
*/
static void ssh_special (Telnet_Special code) {
if (code == TS_EOF) {
- if (ssh_version = 1) {
+ 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 {
ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF);
- ssh2_pkt_adduint32(ssh_remote_channel);
+ ssh2_pkt_adduint32(mainchan->remoteid);
+ ssh2_pkt_send();
+ }
+ 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 {
+ ssh2_pkt_init(SSH2_MSG_IGNORE);
+ ssh2_pkt_addstring_start();
ssh2_pkt_send();
}
} else {
}
}
+static Socket ssh_socket(void) { return s; }
-/*
- * Read and decrypt one incoming SSH packet.
- * (only used by pSCP)
- */
-static void get_packet(void)
-{
- unsigned char buf[4096], *p;
- long to_read;
- int len;
-
- p = NULL;
- len = 0;
-
- while ((to_read = s_rdpkt(&p, &len)) > 0) {
- if (to_read > sizeof(buf)) to_read = sizeof(buf);
- len = s_read(buf, to_read);
- if (len != to_read) {
- closesocket(s);
- s = INVALID_SOCKET;
- return;
- }
- p = buf;
- }
-
- assert(len == 0);
-}
-
-/*
- * Receive a block of data over the SSH link. Block until
- * all data is available. Return nr of bytes read (0 if lost connection).
- * (only used by pSCP)
- */
-int ssh_scp_recv(unsigned char *buf, int len)
-{
- static int pending_input_len = 0;
- static unsigned char *pending_input_ptr;
- int to_read = len;
-
- if (pending_input_len >= to_read) {
- memcpy(buf, pending_input_ptr, to_read);
- pending_input_ptr += to_read;
- pending_input_len -= to_read;
- return len;
- }
-
- if (pending_input_len > 0) {
- memcpy(buf, pending_input_ptr, pending_input_len);
- buf += pending_input_len;
- to_read -= pending_input_len;
- pending_input_len = 0;
- }
-
- if (s == INVALID_SOCKET)
- return 0;
- while (to_read > 0) {
- get_packet();
- if (s == INVALID_SOCKET)
- return 0;
- if (pktin.type == SSH1_SMSG_STDOUT_DATA) {
- int plen = GET_32BIT(pktin.body);
- if (plen <= to_read) {
- memcpy(buf, pktin.body + 4, plen);
- buf += plen;
- to_read -= plen;
- } else {
- memcpy(buf, pktin.body + 4, to_read);
- pending_input_len = plen - to_read;
- pending_input_ptr = pktin.body + 4 + to_read;
- to_read = 0;
- }
- } else if (pktin.type == SSH1_SMSG_STDERR_DATA) {
- int plen = GET_32BIT(pktin.body);
- fwrite(pktin.body + 4, plen, 1, stderr);
- } else if (pktin.type == SSH1_MSG_DISCONNECT) {
- logevent("Received disconnect request");
- } else if (pktin.type == SSH1_SMSG_SUCCESS ||
- pktin.type == SSH1_SMSG_FAILURE) {
- /* ignore */
- } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) {
- char logbuf[100];
- sprintf(logbuf, "Remote exit status: %d", GET_32BIT(pktin.body));
- logevent(logbuf);
- send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END);
- logevent("Closing connection");
- closesocket(s);
- s = INVALID_SOCKET;
- } else {
- fatalbox("Strange packet received: type %d", pktin.type);
- }
- }
-
- return len;
-}
-
-/*
- * Send a block of data over the SSH link.
- * Block until all data is sent.
- * (only used by pSCP)
- */
-void ssh_scp_send(unsigned char *buf, int len)
-{
- if (s == INVALID_SOCKET)
- return;
- send_packet(SSH1_CMSG_STDIN_DATA,
- PKT_INT, len, PKT_DATA, buf, len, PKT_END);
-}
-
-/*
- * Send an EOF notification to the server.
- * (only used by pSCP)
- */
-void ssh_scp_send_eof(void)
-{
- if (s == INVALID_SOCKET)
- return;
- send_packet(SSH1_CMSG_EOF, PKT_END);
-}
-
-/*
- * Set up the connection, login on the remote host and
- * start execution of a command.
- * Returns an error message, or NULL on success.
- * (only used by pSCP)
- */
-char *ssh_scp_init(char *host, int port, char *cmd, char **realhost)
-{
- char buf[160], *p;
-
-#ifdef MSCRYPTOAPI
- if (crypto_startup() == 0)
- return "Microsoft high encryption pack not installed!";
-#endif
-
- p = connect_to_host(host, port, realhost);
- if (p != NULL)
- return p;
-
- random_init();
-
- if (!do_ssh_init())
- return "Protocol initialisation error";
-
- /* Exchange keys and login */
- do {
- get_packet();
- if (s == INVALID_SOCKET)
- return "Connection closed by remote host";
- } while (!do_ssh1_login(NULL, 0, 1));
-
- if (ssh_state == SSH_STATE_CLOSED) {
- closesocket(s);
- s = INVALID_SOCKET;
- return "Session initialisation error";
- }
-
- /* Execute command */
- sprintf(buf, "Sending command: %.100s", cmd);
- logevent(buf);
- send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END);
+static int ssh_sendok(void) { return ssh_send_ok; }
- return NULL;
+static int ssh_ldisc(int option) {
+ if (option == LD_ECHO) return ssh_echoing;
+ if (option == LD_EDIT) return ssh_editing;
+ return FALSE;
}
-static SOCKET ssh_socket(void) { return s; }
-
-static int ssh_sendok(void) { return ssh_send_ok; }
-
Backend ssh_backend = {
ssh_init,
- ssh_msg,
ssh_send,
ssh_size,
ssh_special,
ssh_socket,
- ssh_sendok
+ ssh_sendok,
+ ssh_ldisc,
+ 22
};
projects / u / mdw / putty / blobdiff