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- markus@cvs.openbsd.org 2001/04/11 13:56:13
[channels.c ssh.c]
https-connect and socks5 support. i feel so bad.
This commit is contained in:
Ben Lindstrom
parent
146edb9832
commit
6fa9d10ed5
@ -15,6 +15,9 @@
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- markus@cvs.openbsd.org 2001/04/11 10:59:01
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[ssh.c]
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use strtol() for ports, thanks jakob@
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- markus@cvs.openbsd.org 2001/04/11 13:56:13
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[channels.c ssh.c]
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https-connect and socks5 support. i feel so bad.
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20010410
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- OpenBSD CVS Sync
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@ -5008,4 +5011,4 @@
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- Wrote replacements for strlcpy and mkdtemp
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- Released 1.0pre1
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$Id: ChangeLog,v 1.1098 2001/04/11 23:06:28 mouring Exp $
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$Id: ChangeLog,v 1.1099 2001/04/11 23:08:17 mouring Exp $
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160
channels.c
160
channels.c
@ -40,7 +40,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: channels.c,v 1.105 2001/04/10 12:15:23 markus Exp $");
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RCSID("$OpenBSD: channels.c,v 1.106 2001/04/11 13:56:13 markus Exp $");
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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@ -576,6 +576,39 @@ channel_decode_helper(Channel *c, int start, int lookfor)
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return 0; /* need more */
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}
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/* try to decode a http connect header */
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int
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channel_decode_https(Channel *c, fd_set * readset, fd_set * writeset)
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{
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u_char *p, *host, *buf;
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int port, ret;
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char httpok[] = "HTTP/1.0 200\r\n\r\n";
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debug2("channel %d: decode https connect", c->self);
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ret = channel_decode_helper(c, strlen("connect "), '\r');
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if (ret <= 0)
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return ret;
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p = buffer_ptr(&c->input);
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buf = xmalloc(ret+1);
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host = xmalloc(ret);
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memcpy(buf, p, ret);
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buf[ret] = '\0';
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if (sscanf(buf, "CONNECT %[^:]:%u HTTP/", host, &port) != 2) {
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debug("channel %d: cannot parse http header", c->self);
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return -1;
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}
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debug("channel %d: dynamic request: https host %s port %u",
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c->self, host, port);
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strlcpy(c->path, host, sizeof(c->path));
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c->host_port = port;
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xfree(host);
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xfree(buf);
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buffer_consume(&c->input, ret+4);
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buffer_append(&c->output, httpok, strlen(httpok));
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return 1;
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}
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/* try to decode a socks4 header */
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int
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channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
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@ -601,7 +634,7 @@ channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
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p = buffer_ptr(&c->input);
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len = strlen(p);
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have = buffer_len(&c->input);
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debug2("channel %d: pre_dynamic: user %s/%d", c->self, p, len);
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debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
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if (len > have)
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fatal("channel %d: decode socks4: len %d > have %d",
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c->self, len, have);
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@ -613,10 +646,8 @@ channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
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strlcpy(c->path, host, sizeof(c->path));
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c->host_port = ntohs(s4_req.dest_port);
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debug("channel %d: dynamic request: "
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"socks%x://%s@%s:%u/command?%u",
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c->self, s4_req.version, username, host, c->host_port,
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s4_req.command);
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debug("channel %d: dynamic request: socks4 host %s port %u command %u",
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c->self, host, c->host_port, s4_req.command);
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if (s4_req.command != 1) {
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debug("channel %d: cannot handle: socks4 cn %d",
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@ -631,6 +662,115 @@ channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
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return 1;
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}
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/* try to decode a socks5 header */
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#define SSH_SOCKS5_AUTHDONE 0x1000
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#define SSH_SOCKS5_NOAUTH 0x00
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#define SSH_SOCKS5_IPV4 0x01
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#define SSH_SOCKS5_DOMAIN 0x03
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#define SSH_SOCKS5_IPV6 0x04
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#define SSH_SOCKS5_CONNECT 0x01
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#define SSH_SOCKS5_SUCCESS 0x00
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int
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channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
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{
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struct {
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u_int8_t version;
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u_int8_t command;
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u_int8_t reserved;
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u_int8_t atyp;
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} s5_req, s5_rsp;
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u_int16_t dest_port;
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u_char *p, dest_addr[255+1];
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int i, have, found, nmethods, addrlen, af;
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debug2("channel %d: decode socks5", c->self);
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p = buffer_ptr(&c->input);
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if (p[0] != 0x05)
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return -1;
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have = buffer_len(&c->input);
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if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
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/* format: ver | nmethods | methods */
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if (have < 2)
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return 0;
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nmethods = p[1];
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if (have < nmethods + 2)
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return 0;
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/* look for method: "NO AUTHENTICATION REQUIRED" */
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for (found = 0, i = 2 ; i < nmethods + 2; i++) {
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if (p[i] == SSH_SOCKS5_NOAUTH ) {
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found = 1;
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break;
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}
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}
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if (!found) {
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debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
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c->self);
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return -1;
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}
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buffer_consume(&c->input, nmethods + 2);
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buffer_put_char(&c->output, 0x05); /* version */
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buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
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FD_SET(c->sock, writeset);
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c->flags |= SSH_SOCKS5_AUTHDONE;
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debug2("channel %d: socks5 auth done", c->self);
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return 0; /* need more */
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}
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debug2("channel %d: socks5 post auth", c->self);
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if (have < sizeof(s5_req)+1)
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return 0; /* need more */
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memcpy((char *)&s5_req, p, sizeof(s5_req));
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if (s5_req.version != 0x05 ||
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s5_req.command != SSH_SOCKS5_CONNECT ||
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s5_req.reserved != 0x00) {
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debug("channel %d: only socks5 connect supported", c->self);
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return -1;
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}
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switch(s5_req.atyp){
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case SSH_SOCKS5_IPV4:
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addrlen = 4;
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af = AF_INET;
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break;
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case SSH_SOCKS5_DOMAIN:
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addrlen = p[sizeof(s5_req)];
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af = -1;
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break;
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case SSH_SOCKS5_IPV6:
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addrlen = 16;
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af = AF_INET6;
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break;
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default:
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debug("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
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return -1;
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}
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if (have < 4 + addrlen + 2)
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return 0;
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buffer_consume(&c->input, sizeof(s5_req));
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buffer_get(&c->input, (char *)&dest_addr, addrlen);
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buffer_get(&c->input, (char *)&dest_port, 2);
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dest_addr[addrlen] = '\0';
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if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
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strlcpy(c->path, dest_addr, sizeof(c->path));
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else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
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return -1;
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c->host_port = ntohs(dest_port);
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debug("channel %d: dynamic request: socks5 host %s port %u command %u",
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c->self, c->path, c->host_port, s5_req.command);
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s5_rsp.version = 0x05;
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s5_rsp.command = SSH_SOCKS5_SUCCESS;
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s5_rsp.reserved = 0; /* ignored */
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s5_rsp.atyp = SSH_SOCKS5_IPV4;
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((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
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dest_port = 0; /* ignored */
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buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
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buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
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buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
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return 1;
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}
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/* dynamic port forwarding */
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void
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channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
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@ -651,17 +791,15 @@ channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
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/* try to guess the protocol */
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p = buffer_ptr(&c->input);
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switch (p[0]) {
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case 0x04:
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ret = channel_decode_socks4(c, readset, writeset);
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break;
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#if 0
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case 'C':
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ret = channel_decode_https(c, readset, writeset);
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break;
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case 0x04:
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ret = channel_decode_socks4(c, readset, writeset);
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break;
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case 0x05:
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ret = channel_decode_socks5(c, readset, writeset);
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break;
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#endif
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default:
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ret = -1;
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break;
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7
ssh.c
7
ssh.c
@ -39,7 +39,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: ssh.c,v 1.109 2001/04/11 10:59:01 markus Exp $");
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RCSID("$OpenBSD: ssh.c,v 1.110 2001/04/11 13:56:13 markus Exp $");
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#include <openssl/evp.h>
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#include <openssl/err.h>
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@ -179,8 +179,9 @@ usage(void)
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fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
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fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
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fprintf(stderr, " -D port Dynamically forward local port to multiple remote addresses.\n");
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fprintf(stderr, " Allows SSH to act as an application-layer proxy.\n");
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fprintf(stderr, " Protocols Supported: SOCKS4\n");
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fprintf(stderr, " Allows %s to act as an application-layer proxy.\n",
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__progname);
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fprintf(stderr, " Protocols supported: SOCKS4, SOCKS5, HTTPS\n");
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fprintf(stderr, " -C Enable compression.\n");
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fprintf(stderr, " -N Do not execute a shell or command.\n");
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fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
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