зеркало из https://github.com/github/putty.git
861 строка
22 KiB
C
861 строка
22 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <winsock.h>
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#include "putty.h"
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#include "ssh.h"
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#define SSH_MSG_DISCONNECT 1
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#define SSH_SMSG_PUBLIC_KEY 2
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#define SSH_CMSG_SESSION_KEY 3
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#define SSH_CMSG_USER 4
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#define SSH_CMSG_AUTH_PASSWORD 9
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#define SSH_CMSG_REQUEST_PTY 10
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#define SSH_CMSG_EXEC_SHELL 12
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#define SSH_CMSG_STDIN_DATA 16
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#define SSH_SMSG_STDOUT_DATA 17
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#define SSH_SMSG_STDERR_DATA 18
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#define SSH_SMSG_SUCCESS 14
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#define SSH_SMSG_FAILURE 15
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#define SSH_SMSG_EXITSTATUS 20
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#define SSH_MSG_IGNORE 32
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#define SSH_CMSG_EXIT_CONFIRMATION 33
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#define SSH_MSG_DEBUG 36
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#define SSH_CMSG_AUTH_TIS 39
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#define SSH_SMSG_AUTH_TIS_CHALLENGE 40
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#define SSH_CMSG_AUTH_TIS_RESPONSE 41
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#define SSH_AUTH_TIS 5
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/* Coroutine mechanics for the sillier bits of the code */
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#define crBegin1 static int crLine = 0;
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#define crBegin2 switch(crLine) { case 0:;
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#define crBegin crBegin1; crBegin2;
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#define crFinish(z) } crLine = 0; return (z)
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#define crFinishV } crLine = 0; return
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#define crReturn(z) \
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do {\
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crLine=__LINE__; return (z); case __LINE__:;\
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} while (0)
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#define crReturnV \
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do {\
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crLine=__LINE__; return; case __LINE__:;\
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} while (0)
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#define crStop(z) do{ crLine = 0; return (z); }while(0)
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#define crStopV do{ crLine = 0; return; }while(0)
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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static SOCKET s = INVALID_SOCKET;
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static unsigned char session_key[32];
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static struct ssh_cipher *cipher = NULL;
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static char *savedhost;
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static enum {
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SSH_STATE_BEFORE_SIZE,
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SSH_STATE_INTERMED,
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SSH_STATE_SESSION,
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SSH_STATE_CLOSED
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} ssh_state = SSH_STATE_BEFORE_SIZE;
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static int size_needed = FALSE;
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static void s_write (char *buf, int len) {
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while (len > 0) {
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int i = send (s, buf, len, 0);
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if (i > 0)
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len -= i, buf += i;
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}
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}
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static int s_read (char *buf, int len) {
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int ret = 0;
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while (len > 0) {
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int i = recv (s, buf, len, 0);
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if (i > 0)
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len -= i, buf += i, ret += i;
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else
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return i;
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}
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return ret;
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}
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static void c_write (char *buf, int len) {
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while (len--) {
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int new_head = (inbuf_head + 1) & INBUF_MASK;
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if (new_head != inbuf_reap) {
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inbuf[inbuf_head] = *buf++;
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inbuf_head = new_head;
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} else {
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term_out();
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if( inbuf_head == inbuf_reap ) len++; else break;
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}
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}
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}
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struct Packet {
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long length;
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int type;
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unsigned long crc;
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unsigned char *data;
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unsigned char *body;
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long maxlen;
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};
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static struct Packet pktin = { 0, 0, 0, NULL, 0 };
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static struct Packet pktout = { 0, 0, 0, NULL, 0 };
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static void ssh_protocol(unsigned char *in, int inlen, int ispkt);
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static void ssh_size(void);
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static void ssh_gotdata(unsigned char *data, int datalen) {
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static long len, biglen, to_read;
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static unsigned char *p;
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static int i, pad;
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crBegin;
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while (1) {
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for (i = len = 0; i < 4; i++) {
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while (datalen == 0)
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crReturnV;
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len = (len << 8) + *data;
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data++, datalen--;
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}
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#ifdef FWHACK
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if (len == 0x52656d6f) { /* "Remo"te server has closed ... */
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len = 0x300; /* big enough to carry to end */
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}
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#endif
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pad = 8 - (len%8);
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biglen = len + pad;
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len -= 5; /* type and CRC */
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pktin.length = len;
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if (pktin.maxlen < biglen) {
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pktin.maxlen = biglen;
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pktin.data = (pktin.data == NULL ? malloc(biglen) :
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realloc(pktin.data, biglen));
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if (!pktin.data)
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fatalbox("Out of memory");
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}
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p = pktin.data, to_read = biglen;
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while (to_read > 0) {
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static int chunk;
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chunk = to_read;
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while (datalen == 0)
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crReturnV;
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if (chunk > datalen)
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chunk = datalen;
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memcpy(p, data, chunk);
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data += chunk;
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datalen -= chunk;
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p += chunk;
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to_read -= chunk;
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}
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if (cipher)
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cipher->decrypt(pktin.data, biglen);
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pktin.type = pktin.data[pad];
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pktin.body = pktin.data+pad+1;
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if (pktin.type == SSH_MSG_DEBUG) {
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/* FIXME: log it */
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} else if (pktin.type == SSH_MSG_IGNORE) {
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/* do nothing */;
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} else
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ssh_protocol(NULL, 0, 1);
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}
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crFinishV;
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}
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static void s_wrpkt_start(int type, int len) {
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int pad, biglen;
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len += 5; /* type and CRC */
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pad = 8 - (len%8);
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biglen = len + pad;
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pktout.length = len-5;
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if (pktout.maxlen < biglen) {
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pktout.maxlen = biglen;
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pktout.data = (pktout.data == NULL ? malloc(biglen+4) :
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realloc(pktout.data, biglen+4));
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if (!pktout.data)
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fatalbox("Out of memory");
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}
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pktout.type = type;
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pktout.body = pktout.data+4+pad+1;
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}
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static void s_wrpkt(void) {
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int pad, len, biglen, i;
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unsigned long crc;
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len = pktout.length + 5; /* type and CRC */
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pad = 8 - (len%8);
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biglen = len + pad;
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pktout.body[-1] = pktout.type;
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for (i=0; i<pad; i++)
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pktout.data[i+4] = random_byte();
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crc = crc32(pktout.data+4, biglen-4);
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pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF);
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pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF);
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pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF);
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pktout.data[biglen+3] = (unsigned char) (crc & 0xFF);
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pktout.data[0] = (len >> 24) & 0xFF;
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pktout.data[1] = (len >> 16) & 0xFF;
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pktout.data[2] = (len >> 8) & 0xFF;
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pktout.data[3] = len & 0xFF;
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if (cipher)
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cipher->encrypt(pktout.data+4, biglen);
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s_write(pktout.data, biglen+4);
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}
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static int ssh_versioncmp(char *a, char *b) {
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char *ae, *be;
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unsigned long av, bv;
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av = strtoul(a, &ae, 10);
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bv = strtoul(b, &be, 10);
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if (av != bv) return (av < bv ? -1 : +1);
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if (*ae == '.') ae++;
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if (*be == '.') be++;
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av = strtoul(ae, &ae, 10);
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bv = strtoul(be, &be, 10);
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if (av != bv) return (av < bv ? -1 : +1);
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return 0;
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}
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static int do_ssh_init(void) {
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char c, *vsp;
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char version[10];
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char vstring[80];
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char vlog[sizeof(vstring)+20];
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int i;
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#ifdef FWHACK
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i = 0;
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while (s_read(&c, 1) == 1) {
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if (c == 'S' && i < 2) i++;
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else if (c == 'S' && i == 2) i = 2;
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else if (c == 'H' && i == 2) break;
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else i = 0;
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}
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#else
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if (s_read(&c,1) != 1 || c != 'S') return 0;
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if (s_read(&c,1) != 1 || c != 'S') return 0;
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if (s_read(&c,1) != 1 || c != 'H') return 0;
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#endif
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strcpy(vstring, "SSH-");
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vsp = vstring+4;
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if (s_read(&c,1) != 1 || c != '-') return 0;
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i = 0;
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while (1) {
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if (s_read(&c,1) != 1)
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return 0;
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if (vsp < vstring+sizeof(vstring)-1)
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*vsp++ = c;
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if (i >= 0) {
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if (c == '-') {
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version[i] = '\0';
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i = -1;
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} else if (i < sizeof(version)-1)
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version[i++] = c;
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}
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else if (c == '\n')
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break;
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}
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*vsp = 0;
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sprintf(vlog, "Server version: %s", vstring);
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vlog[strcspn(vlog, "\r\n")] = '\0';
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logevent(vlog);
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sprintf(vstring, "SSH-%s-PuTTY\n",
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(ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5"));
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sprintf(vlog, "We claim version: %s", vstring);
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vlog[strcspn(vlog, "\r\n")] = '\0';
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logevent(vlog);
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s_write(vstring, strlen(vstring));
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return 1;
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}
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static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
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int i, j, len;
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unsigned char session_id[16];
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unsigned char *rsabuf, *keystr1, *keystr2;
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unsigned char cookie[8];
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struct RSAKey servkey, hostkey;
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struct MD5Context md5c;
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static unsigned long supported_ciphers_mask, supported_auths_mask;
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int cipher_type;
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extern struct ssh_cipher ssh_3des;
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extern struct ssh_cipher ssh_des;
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extern struct ssh_cipher ssh_blowfish;
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crBegin;
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random_init();
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while (!ispkt)
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crReturnV;
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if (pktin.type != SSH_SMSG_PUBLIC_KEY)
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fatalbox("Public key packet not received");
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logevent("Received public keys");
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memcpy(cookie, pktin.body, 8);
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i = makekey(pktin.body+8, &servkey, &keystr1);
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j = makekey(pktin.body+8+i, &hostkey, &keystr2);
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/*
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* Hash the host key and print the hash in the log box. Just as
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* a last resort in case the registry's host key checking is
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* compromised, we'll allow the user some ability to verify
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* host keys by eye.
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*/
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MD5Init(&md5c);
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MD5Update(&md5c, keystr2, hostkey.bytes);
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MD5Final(session_id, &md5c);
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{
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char logmsg[80];
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int i;
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logevent("Host key MD5 is:");
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strcpy(logmsg, " ");
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for (i = 0; i < 16; i++)
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sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]);
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logevent(logmsg);
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}
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supported_ciphers_mask = ((pktin.body[12+i+j] << 24) |
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(pktin.body[13+i+j] << 16) |
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(pktin.body[14+i+j] << 8) |
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(pktin.body[15+i+j]));
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supported_auths_mask = ((pktin.body[16+i+j] << 24) |
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(pktin.body[17+i+j] << 16) |
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(pktin.body[18+i+j] << 8) |
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(pktin.body[19+i+j]));
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MD5Init(&md5c);
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MD5Update(&md5c, keystr2, hostkey.bytes);
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MD5Update(&md5c, keystr1, servkey.bytes);
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MD5Update(&md5c, pktin.body, 8);
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MD5Final(session_id, &md5c);
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for (i=0; i<32; i++)
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session_key[i] = random_byte();
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len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes);
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rsabuf = malloc(len);
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if (!rsabuf)
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fatalbox("Out of memory");
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verify_ssh_host_key(savedhost, &hostkey);
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for (i=0; i<32; i++) {
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rsabuf[i] = session_key[i];
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if (i < 16)
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rsabuf[i] ^= session_id[i];
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}
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if (hostkey.bytes > servkey.bytes) {
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rsaencrypt(rsabuf, 32, &servkey);
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rsaencrypt(rsabuf, servkey.bytes, &hostkey);
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} else {
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rsaencrypt(rsabuf, 32, &hostkey);
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rsaencrypt(rsabuf, hostkey.bytes, &servkey);
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}
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logevent("Encrypted session key");
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cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH :
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cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES :
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SSH_CIPHER_3DES;
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if ((supported_ciphers_mask & (1 << cipher_type)) == 0) {
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c_write("Selected cipher not supported, falling back to 3DES\r\n", 53);
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cipher_type = SSH_CIPHER_3DES;
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}
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switch (cipher_type) {
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case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break;
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case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break;
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case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break;
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}
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s_wrpkt_start(SSH_CMSG_SESSION_KEY, len+15);
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pktout.body[0] = cipher_type;
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memcpy(pktout.body+1, cookie, 8);
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pktout.body[9] = (len*8) >> 8;
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pktout.body[10] = (len*8) & 0xFF;
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memcpy(pktout.body+11, rsabuf, len);
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pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */
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pktout.body[len+13] = pktout.body[len+14] = 0;
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s_wrpkt();
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logevent("Trying to enable encryption...");
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free(rsabuf);
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cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish :
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cipher_type == SSH_CIPHER_DES ? &ssh_des :
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&ssh_3des;
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cipher->sesskey(session_key);
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do { crReturnV; } while (!ispkt);
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if (pktin.type != SSH_SMSG_SUCCESS)
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fatalbox("Encryption not successfully enabled");
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logevent("Successfully started encryption");
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fflush(stdout);
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{
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static char username[100];
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static int pos = 0;
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static char c;
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if (!*cfg.username) {
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c_write("login as: ", 10);
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while (pos >= 0) {
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do { crReturnV; } while (ispkt);
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while (inlen--) switch (c = *in++) {
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case 10: case 13:
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username[pos] = 0;
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pos = -1;
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break;
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case 8: case 127:
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if (pos > 0) {
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c_write("\b \b", 3);
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pos--;
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}
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break;
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case 21: case 27:
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while (pos > 0) {
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c_write("\b \b", 3);
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pos--;
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}
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break;
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case 3: case 4:
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random_save_seed();
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exit(0);
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break;
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default:
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if (c >= ' ' && c <= '~' && pos < 40) {
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username[pos++] = c;
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c_write(&c, 1);
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}
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break;
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}
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}
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c_write("\r\n", 2);
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username[strcspn(username, "\n\r")] = '\0';
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} else {
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char stuff[200];
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strncpy(username, cfg.username, 99);
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username[99] = '\0';
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sprintf(stuff, "Sent username \"%s\".\r\n", username);
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c_write(stuff, strlen(stuff));
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}
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s_wrpkt_start(SSH_CMSG_USER, 4+strlen(username));
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{
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char userlog[20+sizeof(username)];
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sprintf(userlog, "Sent username \"%s\"", username);
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logevent(userlog);
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}
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pktout.body[0] = pktout.body[1] = pktout.body[2] = 0;
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pktout.body[3] = strlen(username);
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memcpy(pktout.body+4, username, strlen(username));
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s_wrpkt();
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}
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do { crReturnV; } while (!ispkt);
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while (pktin.type == SSH_SMSG_FAILURE) {
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static char password[100];
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static int pos;
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static char c;
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static int pwpkt_type;
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/*
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* Show password prompt, having first obtained it via a TIS
|
|
* exchange if we're doing TIS authentication.
|
|
*/
|
|
pwpkt_type = SSH_CMSG_AUTH_PASSWORD;
|
|
if (pktin.type == SSH_SMSG_FAILURE &&
|
|
cfg.try_tis_auth &&
|
|
(supported_auths_mask & (1<<SSH_AUTH_TIS))) {
|
|
pwpkt_type = SSH_CMSG_AUTH_TIS_RESPONSE;
|
|
logevent("Requested TIS authentication");
|
|
s_wrpkt_start(SSH_CMSG_AUTH_TIS, 0);
|
|
s_wrpkt();
|
|
do { crReturnV; } while (!ispkt);
|
|
if (pktin.type != SSH_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 == SSH_CMSG_AUTH_PASSWORD)
|
|
c_write("password: ", 10);
|
|
|
|
pos = 0;
|
|
while (pos >= 0) {
|
|
do { crReturnV; } while (ispkt);
|
|
while (inlen--) switch (c = *in++) {
|
|
case 10: case 13:
|
|
password[pos] = 0;
|
|
pos = -1;
|
|
break;
|
|
case 8: case 127:
|
|
if (pos > 0)
|
|
pos--;
|
|
break;
|
|
case 21: case 27:
|
|
pos = 0;
|
|
break;
|
|
case 3: case 4:
|
|
random_save_seed();
|
|
exit(0);
|
|
break;
|
|
default:
|
|
if (c >= ' ' && c <= '~' && pos < 40)
|
|
password[pos++] = c;
|
|
break;
|
|
}
|
|
}
|
|
c_write("\r\n", 2);
|
|
s_wrpkt_start(pwpkt_type, 4+strlen(password));
|
|
pktout.body[0] = pktout.body[1] = pktout.body[2] = 0;
|
|
pktout.body[3] = strlen(password);
|
|
memcpy(pktout.body+4, password, strlen(password));
|
|
s_wrpkt();
|
|
logevent("Sent password");
|
|
memset(password, 0, strlen(password));
|
|
do { crReturnV; } while (!ispkt);
|
|
if (pktin.type == 15) {
|
|
c_write("Access denied\r\n", 15);
|
|
logevent("Authentication refused");
|
|
} else if (pktin.type != 14) {
|
|
fatalbox("Strange packet received, type %d", pktin.type);
|
|
}
|
|
}
|
|
|
|
logevent("Authentication successful");
|
|
|
|
if (!cfg.nopty) {
|
|
i = strlen(cfg.termtype);
|
|
s_wrpkt_start(SSH_CMSG_REQUEST_PTY, i+5*4+1);
|
|
pktout.body[0] = (i >> 24) & 0xFF;
|
|
pktout.body[1] = (i >> 16) & 0xFF;
|
|
pktout.body[2] = (i >> 8) & 0xFF;
|
|
pktout.body[3] = i & 0xFF;
|
|
memcpy(pktout.body+4, cfg.termtype, i);
|
|
i += 4;
|
|
pktout.body[i++] = (rows >> 24) & 0xFF;
|
|
pktout.body[i++] = (rows >> 16) & 0xFF;
|
|
pktout.body[i++] = (rows >> 8) & 0xFF;
|
|
pktout.body[i++] = rows & 0xFF;
|
|
pktout.body[i++] = (cols >> 24) & 0xFF;
|
|
pktout.body[i++] = (cols >> 16) & 0xFF;
|
|
pktout.body[i++] = (cols >> 8) & 0xFF;
|
|
pktout.body[i++] = cols & 0xFF;
|
|
memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */
|
|
s_wrpkt();
|
|
ssh_state = SSH_STATE_INTERMED;
|
|
do { crReturnV; } while (!ispkt);
|
|
if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) {
|
|
fatalbox("Protocol confusion");
|
|
} else if (pktin.type == SSH_SMSG_FAILURE) {
|
|
c_write("Server refused to allocate pty\r\n", 32);
|
|
}
|
|
logevent("Allocated pty");
|
|
}
|
|
|
|
s_wrpkt_start(SSH_CMSG_EXEC_SHELL, 0);
|
|
s_wrpkt();
|
|
logevent("Started session");
|
|
|
|
ssh_state = SSH_STATE_SESSION;
|
|
if (size_needed)
|
|
ssh_size();
|
|
|
|
while (1) {
|
|
crReturnV;
|
|
if (ispkt) {
|
|
if (pktin.type == SSH_SMSG_STDOUT_DATA ||
|
|
pktin.type == SSH_SMSG_STDERR_DATA) {
|
|
long len = 0;
|
|
for (i = 0; i < 4; i++)
|
|
len = (len << 8) + pktin.body[i];
|
|
c_write(pktin.body+4, len);
|
|
} else if (pktin.type == SSH_MSG_DISCONNECT) {
|
|
ssh_state = SSH_STATE_CLOSED;
|
|
logevent("Received disconnect request");
|
|
} else if (pktin.type == SSH_SMSG_SUCCESS) {
|
|
/* may be from EXEC_SHELL on some servers */
|
|
} else if (pktin.type == SSH_SMSG_FAILURE) {
|
|
/* may be from EXEC_SHELL on some servers
|
|
* if no pty is available or in other odd cases. Ignore */
|
|
} else if (pktin.type == SSH_SMSG_EXITSTATUS) {
|
|
s_wrpkt_start(SSH_CMSG_EXIT_CONFIRMATION, 0);
|
|
s_wrpkt();
|
|
} else {
|
|
fatalbox("Strange packet received: type %d", pktin.type);
|
|
}
|
|
} else {
|
|
s_wrpkt_start(SSH_CMSG_STDIN_DATA, 4+inlen);
|
|
pktout.body[0] = (inlen >> 24) & 0xFF;
|
|
pktout.body[1] = (inlen >> 16) & 0xFF;
|
|
pktout.body[2] = (inlen >> 8) & 0xFF;
|
|
pktout.body[3] = inlen & 0xFF;
|
|
memcpy(pktout.body+4, in, inlen);
|
|
s_wrpkt();
|
|
}
|
|
}
|
|
|
|
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().
|
|
*
|
|
* Returns an error message, or NULL on success.
|
|
*
|
|
* Also places the canonical host name into `realhost'.
|
|
*/
|
|
static char *ssh_init (HWND hwnd, 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);
|
|
|
|
#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);
|
|
|
|
if (port < 0)
|
|
port = 22; /* default ssh port */
|
|
|
|
/*
|
|
* 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
|
|
|
|
if (!do_ssh_init())
|
|
return "Protocol initialisation error";
|
|
|
|
if (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);
|
|
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)
|
|
return;
|
|
|
|
ssh_protocol(buf, len, 0);
|
|
}
|
|
|
|
/*
|
|
* Called to set the size of the window from Telnet's POV.
|
|
*/
|
|
static void ssh_size(void) {
|
|
switch (ssh_state) {
|
|
case SSH_STATE_BEFORE_SIZE:
|
|
case SSH_STATE_CLOSED:
|
|
break; /* do nothing */
|
|
case SSH_STATE_INTERMED:
|
|
size_needed = TRUE; /* buffer for later */
|
|
break;
|
|
case SSH_STATE_SESSION:
|
|
if (!cfg.nopty) {
|
|
s_wrpkt_start(11, 16);
|
|
pktout.body[0] = (rows >> 24) & 0xFF;
|
|
pktout.body[1] = (rows >> 16) & 0xFF;
|
|
pktout.body[2] = (rows >> 8) & 0xFF;
|
|
pktout.body[3] = rows & 0xFF;
|
|
pktout.body[4] = (cols >> 24) & 0xFF;
|
|
pktout.body[5] = (cols >> 16) & 0xFF;
|
|
pktout.body[6] = (cols >> 8) & 0xFF;
|
|
pktout.body[7] = cols & 0xFF;
|
|
memset(pktout.body+8, 0, 8);
|
|
s_wrpkt();
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* (Send Telnet special codes)
|
|
*/
|
|
static void ssh_special (Telnet_Special code) {
|
|
/* do nothing */
|
|
}
|
|
|
|
Backend ssh_backend = {
|
|
ssh_init,
|
|
ssh_msg,
|
|
ssh_send,
|
|
ssh_size,
|
|
ssh_special
|
|
};
|