mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-04-10 07:38:06 -05:00
Implement `portfwd-loopback-choice'. Works on local side in Unix as
well, though it's a lot less useful since you still can't bind to low-numbered ports of odd loopback IPs. Should work in principle for SSH2 remote forwardings as well as local ones, but OpenSSH seems unwilling to cooperate. [originally from svn r2344]
This commit is contained in:
Simon Tatham
parent
8cb52a26e1
commit
99b870dbc6
21
cmdline.c
21
cmdline.c
@ -160,7 +160,7 @@ int cmdline_process_param(char *p, char *value, int need_save)
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cfg.username[sizeof(cfg.username) - 1] = '\0';
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}
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if ((!strcmp(p, "-L") || !strcmp(p, "-R"))) {
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char *fwd, *ptr, *q;
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char *fwd, *ptr, *q, *qq;
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int i=0;
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RETURN(2);
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UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
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@ -180,8 +180,23 @@ int cmdline_process_param(char *p, char *value, int need_save)
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return ret;
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}
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strncpy(ptr+1, fwd, sizeof(cfg.portfwd) - i);
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q = strchr(ptr, ':');
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if (q) *q = '\t'; /* replace first : with \t */
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/*
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* We expect _at least_ two colons in this string. The
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* possible formats are `sourceport:desthost:destport', or
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* `sourceip:sourceport:desthost:destport' if you're
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* specifying a particular loopback address. We need to
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* replace the one between source and dest with a \t; this
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* means we must find the second-to-last colon in the
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* string.
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*/
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q = qq = strchr(ptr, ':');
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while (qq) {
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char *qqq = strchr(qq+1, ':');
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if (qqq)
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q = qq;
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qq = qqq;
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}
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if (q) *q = '\t'; /* replace second-last colon with \t */
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cfg.portfwd[sizeof(cfg.portfwd) - 1] = '\0';
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cfg.portfwd[sizeof(cfg.portfwd) - 2] = '\0';
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ptr[strlen(ptr)+1] = '\000'; /* append two '\000' */
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@ -1,4 +1,4 @@
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\versionid $Id: config.but,v 1.44 2002/10/22 09:40:38 simon Exp $
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\versionid $Id: config.but,v 1.45 2002/12/18 11:39:25 simon Exp $
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\C{config} Configuring PuTTY
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@ -1881,6 +1881,19 @@ in the list box.
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To remove a port forwarding, simply select its details in the list
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box, and click the \q{Remove} button.
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In the \q{Source port} box, you can also optionally enter an IP
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address to listen on. Typically a Windows machine can be asked to
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listen on any single IP address in the \cw{127.*.*.*} range, and all
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of these are loopback addresses available only to the local machine.
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So if you forward (for example) \c{127.0.0.5:79} to a remote
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machine's \cw{finger} port, then you should be able to run commands
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such as \c{finger fred@127.0.0.5}. This can be useful if the program
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connecting to the forwarded port doesn't allow you to change the
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port number it uses. This feature is available for local-to-remote
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forwarded ports; SSH1 is unable to support it for remote-to-local
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ports, while SSH2 can support it in theory but servers will not
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necessarily cooperate.
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\S{config-ssh-portfwd-localhost} Controlling the visibility of
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forwarded ports
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@ -1,4 +1,4 @@
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\versionid $Id: using.but,v 1.8 2002/09/11 17:30:36 jacob Exp $
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\versionid $Id: using.but,v 1.9 2002/12/18 11:39:25 simon Exp $
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\C{using} Using PuTTY
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@ -254,7 +254,8 @@ to a port on a remote server, you need to:
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\b Choose a port number on your local machine where PuTTY should
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listen for incoming connections. There are likely to be plenty of
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unused port numbers above 3000.
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unused port numbers above 3000. (You can also use a local loopback
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address here; see \k{config-ssh-portfwd} for more details.)
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\b Now, before you start your SSH connection, go to the Tunnels
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panel (see \k{config-ssh-portfwd}). Make sure the \q{Local} radio
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@ -67,7 +67,7 @@ struct plug_function_table {
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Socket new_connection(SockAddr addr, char *hostname,
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int port, int privport,
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int oobinline, int nodelay, Plug plug);
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Socket new_listener(int port, Plug plug, int local_host_only);
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Socket new_listener(char *srcaddr, int port, Plug plug, int local_host_only);
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/* socket functions */
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@ -84,7 +84,7 @@ void sk_addr_free(SockAddr addr);
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Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
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int nodelay, Plug p);
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Socket sk_newlistener(int port, Plug plug, int local_host_only);
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Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only);
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Socket sk_register(void *sock, Plug plug);
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@ -203,9 +203,10 @@ static int pfd_accepting(Plug p, void *sock)
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/* Add a new forwarding from port -> desthost:destport
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sets up a listener on the local machine on port
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sets up a listener on the local machine on (srcaddr:)port
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*/
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char *pfd_addforward(char *desthost, int destport, int port, void *backhandle)
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char *pfd_addforward(char *desthost, int destport, char *srcaddr, int port,
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void *backhandle)
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{
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static struct plug_function_table fn_table = {
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pfd_closing,
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@ -231,7 +232,7 @@ char *pfd_addforward(char *desthost, int destport, int port, void *backhandle)
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pr->waiting = NULL;
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pr->backhandle = backhandle;
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pr->s = s = new_listener(port, (Plug) pr, !cfg.lport_acceptall);
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pr->s = s = new_listener(srcaddr, port, (Plug) pr, !cfg.lport_acceptall);
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if ((err = sk_socket_error(s))) {
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sfree(pr);
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return err;
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4
proxy.c
4
proxy.c
@ -404,13 +404,13 @@ Socket new_connection(SockAddr addr, char *hostname,
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return sk_new(addr, port, privport, oobinline, nodelay, plug);
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}
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Socket new_listener(int port, Plug plug, int local_host_only)
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Socket new_listener(char *srcaddr, int port, Plug plug, int local_host_only)
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{
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/* TODO: SOCKS (and potentially others) support inbound
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* TODO: connections via the proxy. support them.
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*/
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return sk_newlistener(port, plug, local_host_only);
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return sk_newlistener(srcaddr, port, plug, local_host_only);
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}
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/* ----------------------------------------------------------------------
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99
ssh.c
99
ssh.c
@ -299,8 +299,8 @@ extern void x11_unthrottle(Socket s);
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extern void x11_override_throttle(Socket s, int enable);
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extern char *pfd_newconnect(Socket * s, char *hostname, int port, void *c);
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extern char *pfd_addforward(char *desthost, int destport, int port,
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void *backhandle);
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extern char *pfd_addforward(char *desthost, int destport, char *srcaddr,
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int port, void *backhandle);
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extern void pfd_close(Socket s);
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extern int pfd_send(Socket s, char *data, int len);
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extern void pfd_confirm(Socket s);
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@ -3071,28 +3071,46 @@ static void ssh1_protocol(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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char type;
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int n;
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int sport,dport,sserv,dserv;
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char sports[256], dports[256], host[256];
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char sports[256], dports[256], saddr[256], host[256];
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ssh->rportfwds = newtree234(ssh_rportcmp_ssh1);
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/* Add port forwardings. */
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ssh->portfwd_strptr = cfg.portfwd;
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while (*ssh->portfwd_strptr) {
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type = *ssh->portfwd_strptr++;
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saddr[0] = '\0';
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n = 0;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != '\t')
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sports[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != '\t') {
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if (*ssh->portfwd_strptr == ':') {
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/*
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* We've seen a colon in the middle of the
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* source port number. This means that
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* everything we've seen until now is the
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* source _address_, so we'll move it into
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* saddr and start sports from the beginning
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* again.
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*/
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ssh->portfwd_strptr++;
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sports[n] = '\0';
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strcpy(saddr, sports);
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n = 0;
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}
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if (n < 255) sports[n++] = *ssh->portfwd_strptr++;
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}
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sports[n] = 0;
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if (*ssh->portfwd_strptr == '\t')
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ssh->portfwd_strptr++;
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n = 0;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != ':')
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host[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != ':') {
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if (n < 255) host[n++] = *ssh->portfwd_strptr++;
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}
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host[n] = 0;
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if (*ssh->portfwd_strptr == ':')
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ssh->portfwd_strptr++;
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n = 0;
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while (*ssh->portfwd_strptr)
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dports[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr) {
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if (n < 255) dports[n++] = *ssh->portfwd_strptr++;
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}
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dports[n] = 0;
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ssh->portfwd_strptr++;
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dport = atoi(dports);
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@ -3117,9 +3135,12 @@ static void ssh1_protocol(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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}
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if (sport && dport) {
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if (type == 'L') {
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pfd_addforward(host, dport, sport, ssh);
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logeventf(ssh, "Local port %.*s%.*s%d%.*s forwarding to"
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" %s:%.*s%.*s%d%.*s",
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pfd_addforward(host, dport, *saddr ? saddr : NULL,
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sport, ssh);
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logeventf(ssh, "Local port %.*s%.*s%.*s%.*s%d%.*s"
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" forwarding to %s:%.*s%.*s%d%.*s",
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(int)(*saddr?strlen(saddr):0), *saddr?saddr:NULL,
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(int)(*saddr?1:0), ":",
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(int)(sserv ? strlen(sports) : 0), sports,
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sserv, "(", sport, sserv, ")",
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host,
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@ -3130,6 +3151,11 @@ static void ssh1_protocol(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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pf = smalloc(sizeof(*pf));
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strcpy(pf->dhost, host);
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pf->dport = dport;
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if (saddr) {
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logeventf(ssh,
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"SSH1 cannot handle source address spec \"%s:%d\"; ignoring",
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saddr, sport);
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}
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if (add234(ssh->rportfwds, pf) != pf) {
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logeventf(ssh,
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"Duplicate remote port forwarding to %s:%d",
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@ -5102,28 +5128,46 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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char type;
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int n;
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int sport,dport,sserv,dserv;
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char sports[256], dports[256], host[256];
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char sports[256], dports[256], saddr[256], host[256];
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ssh->rportfwds = newtree234(ssh_rportcmp_ssh2);
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/* Add port forwardings. */
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ssh->portfwd_strptr = cfg.portfwd;
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while (*ssh->portfwd_strptr) {
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type = *ssh->portfwd_strptr++;
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saddr[0] = '\0';
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n = 0;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != '\t')
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sports[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != '\t') {
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if (*ssh->portfwd_strptr == ':') {
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/*
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* We've seen a colon in the middle of the
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* source port number. This means that
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* everything we've seen until now is the
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* source _address_, so we'll move it into
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* saddr and start sports from the beginning
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* again.
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*/
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ssh->portfwd_strptr++;
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sports[n] = '\0';
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strcpy(saddr, sports);
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n = 0;
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}
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if (n < 255) sports[n++] = *ssh->portfwd_strptr++;
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}
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sports[n] = 0;
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if (*ssh->portfwd_strptr == '\t')
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ssh->portfwd_strptr++;
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n = 0;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != ':')
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host[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr && *ssh->portfwd_strptr != ':') {
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if (n < 255) host[n++] = *ssh->portfwd_strptr++;
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}
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host[n] = 0;
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if (*ssh->portfwd_strptr == ':')
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ssh->portfwd_strptr++;
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n = 0;
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while (*ssh->portfwd_strptr)
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dports[n++] = *ssh->portfwd_strptr++;
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while (*ssh->portfwd_strptr) {
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if (n < 255) dports[n++] = *ssh->portfwd_strptr++;
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}
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dports[n] = 0;
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ssh->portfwd_strptr++;
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dport = atoi(dports);
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@ -5148,9 +5192,12 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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}
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if (sport && dport) {
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if (type == 'L') {
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pfd_addforward(host, dport, sport, ssh);
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logeventf(ssh, "Local port %.*s%.*s%d%.*s forwarding to"
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" %s:%.*s%.*s%d%.*s",
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pfd_addforward(host, dport, *saddr ? saddr : NULL,
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sport, ssh);
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logeventf(ssh, "Local port %.*s%.*s%.*s%.*s%d%.*s"
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" forwarding to %s:%.*s%.*s%d%.*s",
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(int)(*saddr?strlen(saddr):0), *saddr?saddr:NULL,
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(int)(*saddr?1:0), ":",
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(int)(sserv ? strlen(sports) : 0), sports,
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sserv, "(", sport, sserv, ")",
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host,
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@ -5167,8 +5214,12 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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" to %s:%d", host, dport);
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sfree(pf);
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} else {
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logeventf(ssh, "Requesting remote port %.*s%.*s%d%.*s"
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logeventf(ssh, "Requesting remote port "
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"%.*s%.*s%.*s%.*s%d%.*s"
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" forward to %s:%.*s%.*s%d%.*s",
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(int)(*saddr?strlen(saddr):0),
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*saddr?saddr:NULL,
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(int)(*saddr?1:0), ":",
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(int)(sserv ? strlen(sports) : 0), sports,
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sserv, "(", sport, sserv, ")",
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host,
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@ -5177,6 +5228,8 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, int ispkt)
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ssh2_pkt_init(ssh, SSH2_MSG_GLOBAL_REQUEST);
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ssh2_pkt_addstring(ssh, "tcpip-forward");
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ssh2_pkt_addbool(ssh, 1);/* want reply */
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if (*saddr)
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ssh2_pkt_addstring(ssh, saddr);
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if (cfg.rport_acceptall)
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ssh2_pkt_addstring(ssh, "0.0.0.0");
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else
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38
unix/uxnet.c
38
unix/uxnet.c
@ -21,6 +21,8 @@
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#include "network.h"
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#include "tree234.h"
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#define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET)
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struct Socket_tag {
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struct socket_function_table *fn;
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/* the above variable absolutely *must* be the first in this structure */
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@ -474,7 +476,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
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return (Socket) ret;
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}
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Socket sk_newlistener(int port, Plug plug, int local_host_only)
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Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
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{
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static struct socket_function_table fn_table = {
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sk_tcp_plug,
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@ -534,6 +536,8 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only)
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if (addr->family == AF_INET6) {
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memset(&a6, 0, sizeof(a6));
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a6.sin6_family = AF_INET6;
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/* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
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* know how to do it. :-) */
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if (local_host_only)
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a6.sin6_addr = in6addr_loopback;
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else
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@ -542,11 +546,32 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only)
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} else
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#endif
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{
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int got_addr = 0;
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a.sin_family = AF_INET;
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if (local_host_only)
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a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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else
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a.sin_addr.s_addr = htonl(INADDR_ANY);
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/*
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* Bind to source address. First try an explicitly
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* specified one...
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*/
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if (srcaddr) {
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a.sin_addr.s_addr = inet_addr(srcaddr);
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if (a.sin_addr.s_addr != INADDR_NONE) {
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/* Override localhost_only with specified listen addr. */
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ret->localhost_only = ipv4_is_loopback(a.sin_addr);
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got_addr = 1;
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}
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}
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/*
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* ... and failing that, go with one of the standard ones.
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*/
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if (!got_addr) {
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if (local_host_only)
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a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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else
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a.sin_addr.s_addr = htonl(INADDR_ANY);
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}
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a.sin_port = htons((short)port);
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}
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#ifdef IPV6
|
||||
@ -763,8 +788,7 @@ int select_result(int fd, int event)
|
||||
break;
|
||||
}
|
||||
|
||||
if (s->localhost_only &&
|
||||
ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) {
|
||||
if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
|
||||
close(t); /* someone let nonlocal through?! */
|
||||
} else if (plug_accepting(s->plug, (void*)t)) {
|
||||
close(t); /* denied or error */
|
||||
|
||||
39
winnet.c
39
winnet.c
@ -55,6 +55,9 @@
|
||||
#include "network.h"
|
||||
#include "tree234.h"
|
||||
|
||||
#define ipv4_is_loopback(addr) \
|
||||
((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
|
||||
|
||||
struct Socket_tag {
|
||||
struct socket_function_table *fn;
|
||||
/* the above variable absolutely *must* be the first in this structure */
|
||||
@ -654,7 +657,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
|
||||
return (Socket) ret;
|
||||
}
|
||||
|
||||
Socket sk_newlistener(int port, Plug plug, int local_host_only)
|
||||
Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
|
||||
{
|
||||
static struct socket_function_table fn_table = {
|
||||
sk_tcp_plug,
|
||||
@ -716,6 +719,8 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only)
|
||||
if (addr->family == AF_INET6) {
|
||||
memset(&a6, 0, sizeof(a6));
|
||||
a6.sin6_family = AF_INET6;
|
||||
/* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
|
||||
* know how to do it. :-) */
|
||||
if (local_host_only)
|
||||
a6.sin6_addr = in6addr_loopback;
|
||||
else
|
||||
@ -724,11 +729,32 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only)
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
int got_addr = 0;
|
||||
a.sin_family = AF_INET;
|
||||
if (local_host_only)
|
||||
a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
||||
else
|
||||
a.sin_addr.s_addr = htonl(INADDR_ANY);
|
||||
|
||||
/*
|
||||
* Bind to source address. First try an explicitly
|
||||
* specified one...
|
||||
*/
|
||||
if (srcaddr) {
|
||||
a.sin_addr.s_addr = inet_addr(srcaddr);
|
||||
if (a.sin_addr.s_addr != INADDR_NONE) {
|
||||
/* Override localhost_only with specified listen addr. */
|
||||
ret->localhost_only = ipv4_is_loopback(a.sin_addr);
|
||||
got_addr = 1;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* ... and failing that, go with one of the standard ones.
|
||||
*/
|
||||
if (!got_addr) {
|
||||
if (local_host_only)
|
||||
a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
||||
else
|
||||
a.sin_addr.s_addr = htonl(INADDR_ANY);
|
||||
}
|
||||
|
||||
a.sin_port = htons((short)port);
|
||||
}
|
||||
#ifdef IPV6
|
||||
@ -1047,8 +1073,7 @@ int select_result(WPARAM wParam, LPARAM lParam)
|
||||
break;
|
||||
}
|
||||
|
||||
if (s->localhost_only &&
|
||||
ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) {
|
||||
if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
|
||||
closesocket(t); /* dodgy WinSock let nonlocal through */
|
||||
} else if (plug_accepting(s->plug, (void*)t)) {
|
||||
closesocket(t); /* denied or error */
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user