version 1.136.2.2, 2006/02/03 02:53:44 |
version 1.137, 2005/06/08 11:25:09 |
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#include "log.h" |
#include "log.h" |
#include "readconf.h" |
#include "readconf.h" |
#include "clientloop.h" |
#include "clientloop.h" |
#include "sshconnect.h" |
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#include "authfd.h" |
#include "authfd.h" |
#include "atomicio.h" |
#include "atomicio.h" |
#include "sshpty.h" |
#include "sshpty.h" |
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static volatile sig_atomic_t received_window_change_signal = 0; |
static volatile sig_atomic_t received_window_change_signal = 0; |
static volatile sig_atomic_t received_signal = 0; |
static volatile sig_atomic_t received_signal = 0; |
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/* Flag indicating whether the user's terminal is in non-blocking mode. */ |
/* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
static int in_non_blocking_mode = 0; |
static int in_non_blocking_mode = 0; |
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/* Common data for the client loop code. */ |
/* Common data for the client loop code. */ |
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struct confirm_ctx { |
struct confirm_ctx { |
int want_tty; |
int want_tty; |
int want_subsys; |
int want_subsys; |
int want_x_fwd; |
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int want_agent_fwd; |
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Buffer cmd; |
Buffer cmd; |
char *term; |
char *term; |
struct termios tio; |
struct termios tio; |
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return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; |
} |
} |
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#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
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void |
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client_x11_get_proto(const char *display, const char *xauth_path, |
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u_int trusted, 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 *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 (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { |
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debug("No xauth program."); |
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} else { |
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if (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 (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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xauth_path, 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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xauth_path, |
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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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/* |
/* |
* This is called when the interactive is entered. This checks if there is |
* This is called when the interactive is entered. This checks if there is |
* an EOF coming on stdin. We must check this explicitly, as select() does |
* an EOF coming on stdin. We must check this explicitly, as select() does |
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client_extra_session2_setup(int id, void *arg) |
client_extra_session2_setup(int id, void *arg) |
{ |
{ |
struct confirm_ctx *cctx = arg; |
struct confirm_ctx *cctx = arg; |
const char *display; |
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Channel *c; |
Channel *c; |
int i; |
int i; |
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if ((c = channel_lookup(id)) == NULL) |
if ((c = channel_lookup(id)) == NULL) |
fatal("%s: no channel for id %d", __func__, id); |
fatal("%s: no channel for id %d", __func__, id); |
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display = getenv("DISPLAY"); |
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if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { |
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char *proto, *data; |
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/* Get reasonable local authentication information. */ |
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client_x11_get_proto(display, options.xauth_location, |
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options.forward_x11_trusted, &proto, &data); |
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/* Request forwarding with authentication spoofing. */ |
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debug("Requesting X11 forwarding with authentication spoofing."); |
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x11_request_forwarding_with_spoofing(id, display, proto, data); |
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/* XXX wait for reply */ |
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} |
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if (cctx->want_agent_fwd && options.forward_agent) { |
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debug("Requesting authentication agent forwarding."); |
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channel_request_start(id, "auth-agent-req@openssh.com", 0); |
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packet_send(); |
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} |
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client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
client_subsystem_reply); |
client_subsystem_reply); |
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{ |
{ |
Buffer m; |
Buffer m; |
Channel *c; |
Channel *c; |
int client_fd, new_fd[3], ver, allowed; |
int client_fd, new_fd[3], ver, i, allowed; |
socklen_t addrlen; |
socklen_t addrlen; |
struct sockaddr_storage addr; |
struct sockaddr_storage addr; |
struct confirm_ctx *cctx; |
struct confirm_ctx *cctx; |
char *cmd; |
char *cmd; |
u_int i, len, env_len, command, flags; |
u_int len, env_len, command, flags; |
uid_t euid; |
uid_t euid; |
gid_t egid; |
gid_t egid; |
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buffer_free(&m); |
buffer_free(&m); |
return; |
return; |
} |
} |
if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
if ((ver = buffer_get_char(&m)) != 1) { |
error("%s: wrong client version %d", __func__, ver); |
error("%s: wrong client version %d", __func__, ver); |
buffer_free(&m); |
buffer_free(&m); |
close(client_fd); |
close(client_fd); |
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buffer_clear(&m); |
buffer_clear(&m); |
buffer_put_int(&m, allowed); |
buffer_put_int(&m, allowed); |
buffer_put_int(&m, getpid()); |
buffer_put_int(&m, getpid()); |
if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
error("%s: client msg_send failed", __func__); |
error("%s: client msg_send failed", __func__); |
close(client_fd); |
close(client_fd); |
buffer_free(&m); |
buffer_free(&m); |
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buffer_clear(&m); |
buffer_clear(&m); |
buffer_put_int(&m, allowed); |
buffer_put_int(&m, allowed); |
buffer_put_int(&m, getpid()); |
buffer_put_int(&m, getpid()); |
if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
error("%s: client msg_send failed", __func__); |
error("%s: client msg_send failed", __func__); |
close(client_fd); |
close(client_fd); |
buffer_free(&m); |
buffer_free(&m); |
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buffer_free(&m); |
buffer_free(&m); |
return; |
return; |
} |
} |
if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
if ((ver = buffer_get_char(&m)) != 1) { |
error("%s: wrong client version %d", __func__, ver); |
error("%s: wrong client version %d", __func__, ver); |
buffer_free(&m); |
buffer_free(&m); |
close(client_fd); |
close(client_fd); |
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memset(cctx, 0, sizeof(*cctx)); |
memset(cctx, 0, sizeof(*cctx)); |
cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; |
cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; |
cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0; |
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cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0; |
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cctx->term = buffer_get_string(&m, &len); |
cctx->term = buffer_get_string(&m, &len); |
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cmd = buffer_get_string(&m, &len); |
cmd = buffer_get_string(&m, &len); |
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/* This roundtrip is just for synchronisation of ttymodes */ |
/* This roundtrip is just for synchronisation of ttymodes */ |
buffer_clear(&m); |
buffer_clear(&m); |
if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
error("%s: client msg_send failed", __func__); |
error("%s: client msg_send failed", __func__); |
close(client_fd); |
close(client_fd); |
close(new_fd[0]); |
close(new_fd[0]); |
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logit(" -Lport:host:hostport Request local forward"); |
logit(" -Lport:host:hostport Request local forward"); |
logit(" -Rport:host:hostport Request remote forward"); |
logit(" -Rport:host:hostport Request remote forward"); |
logit(" -KRhostport Cancel remote forward"); |
logit(" -KRhostport Cancel remote forward"); |
if (!options.permit_local_command) |
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goto out; |
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logit(" !args Execute local command"); |
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goto out; |
goto out; |
} |
} |
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if (*s == '!' && options.permit_local_command) { |
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s++; |
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ssh_local_cmd(s); |
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goto out; |
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} |
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if (*s == 'K') { |
if (*s == 'K') { |
delete = 1; |
delete = 1; |
s++; |
s++; |
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u_char ch; |
u_char ch; |
char *s; |
char *s; |
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if (len <= 0) |
for (i = 0; i < len; i++) { |
return (0); |
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for (i = 0; i < (u_int)len; i++) { |
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/* Get one character at a time. */ |
/* Get one character at a time. */ |
ch = buf[i]; |
ch = buf[i]; |
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session_ident = ssh2_chan_id; |
session_ident = ssh2_chan_id; |
if (escape_char != SSH_ESCAPECHAR_NONE) |
if (escape_char != SSH_ESCAPECHAR_NONE) |
channel_register_filter(session_ident, |
channel_register_filter(session_ident, |
simple_escape_filter, NULL); |
simple_escape_filter); |
if (session_ident != -1) |
if (session_ident != -1) |
channel_register_cleanup(session_ident, |
channel_register_cleanup(session_ident, |
client_channel_closed, 0); |
client_channel_closed); |
} else { |
} else { |
/* Check if we should immediately send eof on stdin. */ |
/* Check if we should immediately send eof on stdin. */ |
client_check_initial_eof_on_stdin(); |
client_check_initial_eof_on_stdin(); |
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if (!options.forward_x11) { |
if (!options.forward_x11) { |
error("Warning: ssh server tried X11 forwarding."); |
error("Warning: ssh server tried X11 forwarding."); |
error("Warning: this is probably a break-in attempt by a malicious server."); |
error("Warning: this is probably a break in attempt by a malicious server."); |
return NULL; |
return NULL; |
} |
} |
originator = packet_get_string(NULL); |
originator = packet_get_string(NULL); |
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if (!options.forward_agent) { |
if (!options.forward_agent) { |
error("Warning: ssh server tried agent forwarding."); |
error("Warning: ssh server tried agent forwarding."); |
error("Warning: this is probably a break-in attempt by a malicious server."); |
error("Warning: this is probably a break in attempt by a malicious server."); |
return NULL; |
return NULL; |
} |
} |
sock = ssh_get_authentication_socket(); |
sock = ssh_get_authentication_socket(); |
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/* Split */ |
/* Split */ |
name = xstrdup(env[i]); |
name = xstrdup(env[i]); |
if ((val = strchr(name, '=')) == NULL) { |
if ((val = strchr(name, '=')) == NULL) { |
xfree(name); |
free(name); |
continue; |
continue; |
} |
} |
*val++ = '\0'; |
*val++ = '\0'; |
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} |
} |
if (!matched) { |
if (!matched) { |
debug3("Ignored env %s", name); |
debug3("Ignored env %s", name); |
xfree(name); |
free(name); |
continue; |
continue; |
} |
} |
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packet_put_cstring(name); |
packet_put_cstring(name); |
packet_put_cstring(val); |
packet_put_cstring(val); |
packet_send(); |
packet_send(); |
xfree(name); |
free(name); |
} |
} |
} |
} |
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