version 1.226.2.2, 2005/06/05 02:22:39 |
version 1.226.2.3, 2005/09/02 03:45:01 |
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int control_fd = -1; |
int control_fd = -1; |
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/* Multiplexing control command */ |
/* Multiplexing control command */ |
static u_int mux_command = SSHMUX_COMMAND_OPEN; |
static u_int mux_command = 0; |
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/* Only used in control client mode */ |
/* Only used in control client mode */ |
volatile sig_atomic_t control_client_terminate = 0; |
volatile sig_atomic_t control_client_terminate = 0; |
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int dummy; |
int dummy; |
extern int optind, optreset; |
extern int optind, optreset; |
extern char *optarg; |
extern char *optarg; |
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struct servent *sp; |
Forward fwd; |
Forward fwd; |
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/* |
/* |
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} |
} |
break; |
break; |
case 'M': |
case 'M': |
options.control_master = |
if (options.control_master == SSHCTL_MASTER_YES) |
(options.control_master >= 1) ? 2 : 1; |
options.control_master = SSHCTL_MASTER_ASK; |
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else |
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options.control_master = SSHCTL_MASTER_YES; |
break; |
break; |
case 'p': |
case 'p': |
options.port = a2port(optarg); |
options.port = a2port(optarg); |
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fwd.listen_host = cleanhostname(fwd.listen_host); |
fwd.listen_host = cleanhostname(fwd.listen_host); |
} else { |
} else { |
fwd.listen_port = a2port(fwd.listen_host); |
fwd.listen_port = a2port(fwd.listen_host); |
fwd.listen_host = ""; |
fwd.listen_host = NULL; |
} |
} |
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if (fwd.listen_port == 0) { |
if (fwd.listen_port == 0) { |
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if (no_tty_flag) |
if (no_tty_flag) |
tty_flag = 0; |
tty_flag = 0; |
/* Do not allocate a tty if stdin is not a tty. */ |
/* Do not allocate a tty if stdin is not a tty. */ |
if (!isatty(fileno(stdin)) && !force_tty_flag) { |
if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
if (tty_flag) |
if (tty_flag) |
logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
tty_flag = 0; |
tty_flag = 0; |
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*p = tolower(*p); |
*p = tolower(*p); |
} |
} |
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/* Get default port if port has not been set. */ |
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if (options.port == 0) { |
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sp = getservbyname(SSH_SERVICE_NAME, "tcp"); |
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options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; |
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} |
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if (options.proxy_command != NULL && |
if (options.proxy_command != NULL && |
strcmp(options.proxy_command, "none") == 0) |
strcmp(options.proxy_command, "none") == 0) |
options.proxy_command = NULL; |
options.proxy_command = NULL; |
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if (options.control_path != NULL && |
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strcmp(options.control_path, "none") == 0) |
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options.control_path = NULL; |
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if (options.control_path != NULL) { |
if (options.control_path != NULL) { |
options.control_path = tilde_expand_filename( |
snprintf(buf, sizeof(buf), "%d", options.port); |
options.control_path, original_real_uid); |
cp = tilde_expand_filename(options.control_path, |
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original_real_uid); |
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options.control_path = percent_expand(cp, "p", buf, "h", host, |
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"r", options.user, (char *)NULL); |
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xfree(cp); |
} |
} |
if (options.control_path != NULL && options.control_master == 0) |
if (mux_command != 0 && options.control_path == NULL) |
control_client(options.control_path); /* This doesn't return */ |
fatal("No ControlPath specified for \"-O\" command"); |
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if (options.control_path != NULL) |
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control_client(options.control_path); |
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/* Open a connection to the remote host. */ |
/* Open a connection to the remote host. */ |
if (ssh_connect(host, &hostaddr, options.port, |
if (ssh_connect(host, &hostaddr, options.port, |
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return exit_status; |
return exit_status; |
} |
} |
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#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
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static void |
static void |
x11_get_proto(char **_proto, char **_data) |
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{ |
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char cmd[1024]; |
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char line[512]; |
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char xdisplay[512]; |
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static char proto[512], data[512]; |
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FILE *f; |
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int got_data = 0, generated = 0, do_unlink = 0, i; |
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char *display, *xauthdir, *xauthfile; |
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struct stat st; |
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xauthdir = xauthfile = NULL; |
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*_proto = proto; |
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*_data = data; |
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proto[0] = data[0] = '\0'; |
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if (!options.xauth_location || |
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(stat(options.xauth_location, &st) == -1)) { |
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debug("No xauth program."); |
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} else { |
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if ((display = getenv("DISPLAY")) == NULL) { |
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debug("x11_get_proto: DISPLAY not set"); |
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return; |
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} |
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/* |
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* Handle FamilyLocal case where $DISPLAY does |
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* not match an authorization entry. For this we |
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* just try "xauth list unix:displaynum.screennum". |
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* XXX: "localhost" match to determine FamilyLocal |
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* is not perfect. |
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*/ |
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if (strncmp(display, "localhost:", 10) == 0) { |
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snprintf(xdisplay, sizeof(xdisplay), "unix:%s", |
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display + 10); |
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display = xdisplay; |
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} |
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if (options.forward_x11_trusted == 0) { |
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xauthdir = xmalloc(MAXPATHLEN); |
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xauthfile = xmalloc(MAXPATHLEN); |
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strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
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if (mkdtemp(xauthdir) != NULL) { |
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do_unlink = 1; |
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snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", |
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xauthdir); |
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snprintf(cmd, sizeof(cmd), |
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"%s -f %s generate %s " SSH_X11_PROTO |
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" untrusted timeout 1200 2>" _PATH_DEVNULL, |
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options.xauth_location, xauthfile, display); |
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debug2("x11_get_proto: %s", cmd); |
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if (system(cmd) == 0) |
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generated = 1; |
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} |
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} |
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snprintf(cmd, sizeof(cmd), |
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"%s %s%s list %s . 2>" _PATH_DEVNULL, |
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options.xauth_location, |
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generated ? "-f " : "" , |
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generated ? xauthfile : "", |
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display); |
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debug2("x11_get_proto: %s", cmd); |
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f = popen(cmd, "r"); |
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if (f && fgets(line, sizeof(line), f) && |
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sscanf(line, "%*s %511s %511s", proto, data) == 2) |
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got_data = 1; |
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if (f) |
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pclose(f); |
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} |
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if (do_unlink) { |
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unlink(xauthfile); |
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rmdir(xauthdir); |
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} |
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if (xauthdir) |
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xfree(xauthdir); |
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if (xauthfile) |
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xfree(xauthfile); |
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/* |
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* If we didn't get authentication data, just make up some |
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* data. The forwarding code will check the validity of the |
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* response anyway, and substitute this data. The X11 |
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* server, however, will ignore this fake data and use |
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* whatever authentication mechanisms it was using otherwise |
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* for the local connection. |
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*/ |
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if (!got_data) { |
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u_int32_t rnd = 0; |
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logit("Warning: No xauth data; " |
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"using fake authentication data for X11 forwarding."); |
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strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
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for (i = 0; i < 16; i++) { |
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if (i % 4 == 0) |
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rnd = arc4random(); |
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snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
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rnd & 0xff); |
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rnd >>= 8; |
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} |
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} |
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} |
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static void |
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ssh_init_forwarding(void) |
ssh_init_forwarding(void) |
{ |
{ |
int success = 0; |
int success = 0; |
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for (i = 0; i < options.num_remote_forwards; i++) { |
for (i = 0; i < options.num_remote_forwards; i++) { |
debug("Remote connections from %.200s:%d forwarded to " |
debug("Remote connections from %.200s:%d forwarded to " |
"local address %.200s:%d", |
"local address %.200s:%d", |
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(options.remote_forwards[i].listen_host == NULL) ? |
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(options.gateway_ports ? "*" : "LOCALHOST") : |
options.remote_forwards[i].listen_host, |
options.remote_forwards[i].listen_host, |
options.remote_forwards[i].listen_port, |
options.remote_forwards[i].listen_port, |
options.remote_forwards[i].connect_host, |
options.remote_forwards[i].connect_host, |
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int have_tty = 0; |
int have_tty = 0; |
struct winsize ws; |
struct winsize ws; |
char *cp; |
char *cp; |
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const char *display; |
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/* Enable compression if requested. */ |
/* Enable compression if requested. */ |
if (options.compression) { |
if (options.compression) { |
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packet_disconnect("Protocol error waiting for pty request response."); |
packet_disconnect("Protocol error waiting for pty request response."); |
} |
} |
/* Request X11 forwarding if enabled and DISPLAY is set. */ |
/* Request X11 forwarding if enabled and DISPLAY is set. */ |
if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
display = getenv("DISPLAY"); |
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if (options.forward_x11 && display != NULL) { |
char *proto, *data; |
char *proto, *data; |
/* Get reasonable local authentication information. */ |
/* Get reasonable local authentication information. */ |
x11_get_proto(&proto, &data); |
client_x11_get_proto(display, options.xauth_location, |
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options.forward_x11_trusted, &proto, &data); |
/* Request forwarding with authentication spoofing. */ |
/* Request forwarding with authentication spoofing. */ |
debug("Requesting X11 forwarding with authentication spoofing."); |
debug("Requesting X11 forwarding with authentication spoofing."); |
x11_request_forwarding_with_spoofing(0, proto, data); |
x11_request_forwarding_with_spoofing(0, display, proto, data); |
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/* Read response from the server. */ |
/* Read response from the server. */ |
type = packet_read(); |
type = packet_read(); |
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struct sockaddr_un addr; |
struct sockaddr_un addr; |
mode_t old_umask; |
mode_t old_umask; |
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if (options.control_path == NULL || options.control_master <= 0) |
if (options.control_path == NULL || |
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options.control_master == SSHCTL_MASTER_NO) |
return; |
return; |
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debug("setting up multiplex master socket"); |
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memset(&addr, '\0', sizeof(addr)); |
memset(&addr, '\0', sizeof(addr)); |
addr.sun_family = AF_UNIX; |
addr.sun_family = AF_UNIX; |
addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
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old_umask = umask(0177); |
old_umask = umask(0177); |
if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) { |
if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) { |
control_fd = -1; |
control_fd = -1; |
if (errno == EINVAL) |
if (errno == EINVAL || errno == EADDRINUSE) |
fatal("ControlSocket %s already exists", |
fatal("ControlSocket %s already exists", |
options.control_path); |
options.control_path); |
else |
else |
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ssh_session2_setup(int id, void *arg) |
ssh_session2_setup(int id, void *arg) |
{ |
{ |
extern char **environ; |
extern char **environ; |
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const char *display; |
int interactive = tty_flag; |
int interactive = tty_flag; |
if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
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display = getenv("DISPLAY"); |
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if (options.forward_x11 && display != NULL) { |
char *proto, *data; |
char *proto, *data; |
/* Get reasonable local authentication information. */ |
/* Get reasonable local authentication information. */ |
x11_get_proto(&proto, &data); |
client_x11_get_proto(display, options.xauth_location, |
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options.forward_x11_trusted, &proto, &data); |
/* Request forwarding with authentication spoofing. */ |
/* Request forwarding with authentication spoofing. */ |
debug("Requesting X11 forwarding with authentication spoofing."); |
debug("Requesting X11 forwarding with authentication spoofing."); |
x11_request_forwarding_with_spoofing(id, proto, data); |
x11_request_forwarding_with_spoofing(id, display, proto, data); |
interactive = 1; |
interactive = 1; |
/* XXX wait for reply */ |
/* XXX wait for reply */ |
} |
} |
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extern char **environ; |
extern char **environ; |
u_int flags; |
u_int flags; |
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if (stdin_null_flag) { |
if (mux_command == 0) |
if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) |
mux_command = SSHMUX_COMMAND_OPEN; |
fatal("open(/dev/null): %s", strerror(errno)); |
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if (dup2(fd, STDIN_FILENO) == -1) |
switch (options.control_master) { |
fatal("dup2: %s", strerror(errno)); |
case SSHCTL_MASTER_AUTO: |
if (fd > STDERR_FILENO) |
case SSHCTL_MASTER_AUTO_ASK: |
close(fd); |
debug("auto-mux: Trying existing master"); |
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/* FALLTHROUGH */ |
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case SSHCTL_MASTER_NO: |
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break; |
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default: |
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return; |
} |
} |
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memset(&addr, '\0', sizeof(addr)); |
memset(&addr, '\0', sizeof(addr)); |
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if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
fatal("%s socket(): %s", __func__, strerror(errno)); |
fatal("%s socket(): %s", __func__, strerror(errno)); |
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if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) |
if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) { |
fatal("Couldn't connect to %s: %s", path, strerror(errno)); |
if (mux_command != SSHMUX_COMMAND_OPEN) { |
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fatal("Control socket connect(%.100s): %s", path, |
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strerror(errno)); |
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} |
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if (errno == ENOENT) |
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debug("Control socket \"%.100s\" does not exist", path); |
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else { |
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error("Control socket connect(%.100s): %s", path, |
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strerror(errno)); |
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} |
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close(sock); |
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return; |
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} |
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if ((term = getenv("TERM")) == NULL) |
if (stdin_null_flag) { |
term = ""; |
if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) |
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fatal("open(/dev/null): %s", strerror(errno)); |
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if (dup2(fd, STDIN_FILENO) == -1) |
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fatal("dup2: %s", strerror(errno)); |
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if (fd > STDERR_FILENO) |
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close(fd); |
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} |
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term = getenv("TERM"); |
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flags = 0; |
flags = 0; |
if (tty_flag) |
if (tty_flag) |
flags |= SSHMUX_FLAG_TTY; |
flags |= SSHMUX_FLAG_TTY; |
if (subsystem_flag) |
if (subsystem_flag) |
flags |= SSHMUX_FLAG_SUBSYS; |
flags |= SSHMUX_FLAG_SUBSYS; |
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if (options.forward_x11) |
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flags |= SSHMUX_FLAG_X11_FWD; |
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if (options.forward_agent) |
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flags |= SSHMUX_FLAG_AGENT_FWD; |
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buffer_init(&m); |
buffer_init(&m); |
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/* Send our command to server */ |
/* Send our command to server */ |
buffer_put_int(&m, mux_command); |
buffer_put_int(&m, mux_command); |
buffer_put_int(&m, flags); |
buffer_put_int(&m, flags); |
if (ssh_msg_send(sock, /* version */1, &m) == -1) |
if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
fatal("%s: msg_send", __func__); |
fatal("%s: msg_send", __func__); |
buffer_clear(&m); |
buffer_clear(&m); |
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/* Get authorisation status and PID of controlee */ |
/* Get authorisation status and PID of controlee */ |
if (ssh_msg_recv(sock, &m) == -1) |
if (ssh_msg_recv(sock, &m) == -1) |
fatal("%s: msg_recv", __func__); |
fatal("%s: msg_recv", __func__); |
if (buffer_get_char(&m) != 1) |
if (buffer_get_char(&m) != SSHMUX_VER) |
fatal("%s: wrong version", __func__); |
fatal("%s: wrong version", __func__); |
if (buffer_get_int(&m) != 1) |
if (buffer_get_int(&m) != 1) |
fatal("Connection to master denied"); |
fatal("Connection to master denied"); |
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} |
} |
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/* SSHMUX_COMMAND_OPEN */ |
/* SSHMUX_COMMAND_OPEN */ |
buffer_put_cstring(&m, term); |
buffer_put_cstring(&m, term ? term : ""); |
buffer_append(&command, "\0", 1); |
buffer_append(&command, "\0", 1); |
buffer_put_cstring(&m, buffer_ptr(&command)); |
buffer_put_cstring(&m, buffer_ptr(&command)); |
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} |
} |
} |
} |
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if (ssh_msg_send(sock, /* version */1, &m) == -1) |
if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
fatal("%s: msg_send", __func__); |
fatal("%s: msg_send", __func__); |
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mm_send_fd(sock, STDIN_FILENO); |
mm_send_fd(sock, STDIN_FILENO); |
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buffer_clear(&m); |
buffer_clear(&m); |
if (ssh_msg_recv(sock, &m) == -1) |
if (ssh_msg_recv(sock, &m) == -1) |
fatal("%s: msg_recv", __func__); |
fatal("%s: msg_recv", __func__); |
if (buffer_get_char(&m) != 1) |
if (buffer_get_char(&m) != SSHMUX_VER) |
fatal("%s: wrong version", __func__); |
fatal("%s: wrong version", __func__); |
buffer_free(&m); |
buffer_free(&m); |
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