+/* $OpenBSD: ssh.c,v 1.301 2007/08/07 07:32:53 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: ssh.c,v 1.257 2005/12/20 04:41:07 dtucker Exp $");
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#include <sys/resource.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
#include <openssl/evp.h>
#include <openssl/err.h>
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "ssh2.h"
#include "compat.h"
#include "cipher.h"
-#include "xmalloc.h"
#include "packet.h"
#include "buffer.h"
-#include "bufaux.h"
#include "channels.h"
#include "key.h"
#include "authfd.h"
#include "msg.h"
#include "monitor_fdpass.h"
#include "uidswap.h"
+#include "version.h"
#ifdef SMARTCARD
#include "scard.h"
usage(void)
{
fprintf(stderr,
-"usage: ssh [-1246AaCfgkMNnqrsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
+"usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
-" [-w tunnel:tunnel] [user@]hostname [command]\n"
-" [-r Receive Buffer Size in K]\n"
+" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
);
exit(255);
}
/* Parse command-line arguments. */
host = NULL;
- /* need to set options.tcp_rcv_buf to 0 */
- options.tcp_rcv_buf = 0;
-
-again:
+ again:
while ((opt = getopt(ac, av,
- "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XYz")) != -1) {
+ "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:KL:MNO:PR:S:TVw:XY")) != -1) {
switch (opt) {
case '1':
options.protocol = SSH_PROTO_1;
case 'k':
options.gss_deleg_creds = 0;
break;
+ case 'K':
+ options.gss_authentication = 1;
+ options.gss_deleg_creds = 1;
+ break;
case 'i':
if (stat(optarg, &st) < 0) {
fprintf(stderr, "Warning: Identity file %s "
case 'N':
no_shell_flag = 1;
no_tty_flag = 1;
- options.none_switch = 0;
- break;
- case 'T':
- no_tty_flag = 1;
- options.none_switch = 0;
break;
case 'o':
dummy = 1;
exit(255);
xfree(line);
break;
+ case 'T':
+ no_tty_flag = 1;
+ /* ensure that the user doesn't try to backdoor a */
+ /* null cipher switch on an interactive session */
+ /* so explicitly disable it no matter what */
+ options.none_switch=0;
+ break;
case 's':
subsystem_flag = 1;
break;
break;
case 'b':
options.bind_address = optarg;
- case 'r':
- options.tcp_rcv_buf = atoi(optarg) * 1024;
- break;
- case 'z':
- /* make sure we can't turn on the none_switch */
- /* if they try to force a no tty flag on a tty session */
- if (!no_tty_flag) {
- options.none_switch = 1;
- }
break;
case 'F':
config = optarg;
break;
-
default:
usage();
}
if (!read_config_file(config, host, &options, 0))
fatal("Can't open user config file %.100s: "
"%.100s", config, strerror(errno));
- } else {
+ } else {
/*
* Since the config file parsing code aborts if it sees
* options it doesn't recognize, allow users to put
if (options.host_key_alias != NULL) {
for (p = options.host_key_alias; *p; p++)
if (isupper(*p))
- *p = tolower(*p);
+ *p = (char)tolower(*p);
}
/* Get default port if port has not been set. */
options.control_path = NULL;
if (options.control_path != NULL) {
+ char thishost[NI_MAXHOST];
+
+ if (gethostname(thishost, sizeof(thishost)) == -1)
+ fatal("gethostname: %s", strerror(errno));
snprintf(buf, sizeof(buf), "%d", options.port);
cp = tilde_expand_filename(options.control_path,
original_real_uid);
options.control_path = percent_expand(cp, "p", buf, "h", host,
- "r", options.user, (char *)NULL);
+ "r", options.user, "l", thishost, (char *)NULL);
xfree(cp);
}
if (mux_command != 0 && options.control_path == NULL)
if (options.rhosts_rsa_authentication ||
options.hostbased_authentication) {
sensitive_data.nkeys = 3;
- sensitive_data.keys = xmalloc(sensitive_data.nkeys *
+ sensitive_data.keys = xcalloc(sensitive_data.nkeys,
sizeof(Key));
PRIV_START;
sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
- _PATH_HOST_KEY_FILE, "", NULL);
+ _PATH_HOST_KEY_FILE, "", NULL, NULL);
sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
- _PATH_HOST_DSA_KEY_FILE, "", NULL);
+ _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
- _PATH_HOST_RSA_KEY_FILE, "", NULL);
+ _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
PRIV_END;
if (options.hostbased_authentication == 1 &&
options.local_forwards[i].listen_port,
options.local_forwards[i].connect_host,
options.local_forwards[i].connect_port,
- options.gateway_ports);
+ options.gateway_ports, options.hpn_disabled,
+ options.hpn_buffer_size);
}
+ if (i > 0 && success != i && options.exit_on_forward_failure)
+ fatal("Could not request local forwarding.");
if (i > 0 && success == 0)
error("Could not request local forwarding.");
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
options.remote_forwards[i].connect_port);
- channel_request_remote_forwarding(
+ if (channel_request_remote_forwarding(
options.remote_forwards[i].listen_host,
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
- options.remote_forwards[i].connect_port);
+ options.remote_forwards[i].connect_port) < 0) {
+ if (options.exit_on_forward_failure)
+ fatal("Could not request remote forwarding.");
+ else
+ logit("Warning: Could not request remote "
+ "forwarding.");
+ }
}
+
+ /* Initiate tunnel forwarding. */
+ if (options.tun_open != SSH_TUNMODE_NO) {
+ if (client_request_tun_fwd(options.tun_open,
+ options.tun_local, options.tun_remote) == -1) {
+ if (options.exit_on_forward_failure)
+ fatal("Could not request tunnel forwarding.");
+ else
+ error("Could not request tunnel forwarding.");
+ }
+ }
}
static void
/* Store window size in the packet. */
if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
memset(&ws, 0, sizeof(ws));
- packet_put_int(ws.ws_row);
- packet_put_int(ws.ws_col);
- packet_put_int(ws.ws_xpixel);
- packet_put_int(ws.ws_ypixel);
+ packet_put_int((u_int)ws.ws_row);
+ packet_put_int((u_int)ws.ws_col);
+ packet_put_int((u_int)ws.ws_xpixel);
+ packet_put_int((u_int)ws.ws_ypixel);
/* Store tty modes in the packet. */
tty_make_modes(fileno(stdin), NULL);
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
options.remote_forwards[i].connect_port);
- if (type == SSH2_MSG_REQUEST_FAILURE)
- logit("Warning: remote port forwarding failed for listen "
- "port %d", options.remote_forwards[i].listen_port);
+ if (type == SSH2_MSG_REQUEST_FAILURE) {
+ if (options.exit_on_forward_failure)
+ fatal("Error: remote port forwarding failed for "
+ "listen port %d",
+ options.remote_forwards[i].listen_port);
+ else
+ logit("Warning: remote port forwarding failed for "
+ "listen port %d",
+ options.remote_forwards[i].listen_port);
+ }
}
static void
fatal("%s socket(): %s", __func__, strerror(errno));
old_umask = umask(0177);
- if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) {
+ if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
control_fd = -1;
if (errno == EINVAL || errno == EADDRINUSE)
fatal("ControlSocket %s already exists",
packet_send();
}
- if (options.tun_open != SSH_TUNMODE_NO) {
- Channel *c;
- int fd;
-
- debug("Requesting tun.");
- if ((fd = tun_open(options.tun_local,
- options.tun_open)) >= 0) {
- c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
- CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
- 0, "tun", 1);
- c->datagram = 1;
-#if defined(SSH_TUN_FILTER)
- if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
- channel_register_filter(c->self, sys_tun_infilter,
- sys_tun_outfilter);
-#endif
- packet_start(SSH2_MSG_CHANNEL_OPEN);
- packet_put_cstring("tun@openssh.com");
- packet_put_int(c->self);
- packet_put_int(c->local_window_max);
- packet_put_int(c->local_maxpacket);
- packet_put_int(options.tun_open);
- packet_put_int(options.tun_remote);
- packet_send();
- }
- }
-
client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
{
Channel *c;
int window, packetmax, in, out, err;
+ int sock;
+ int socksize;
+ int socksizelen = sizeof(int);
if (stdin_null_flag) {
in = open(_PATH_DEVNULL, O_RDONLY);
if (!isatty(err))
set_nonblock(err);
- window = CHAN_SES_WINDOW_DEFAULT;
+ /* we need to check to see if what they want to do about buffer */
+ /* sizes here. In a hpn to nonhpn connection we want to limit */
+ /* the window size to something reasonable in case the far side */
+ /* has the large window bug. In hpn to hpn connection we want to */
+ /* use the max window size but allow the user to override it */
+ /* lastly if they disabled hpn then use the ssh std window size */
+
+ /* so why don't we just do a getsockopt() here and set the */
+ /* ssh window to that? In the case of a autotuning receive */
+ /* window the window would get stuck at the initial buffer */
+ /* size generally less than 96k. Therefore we need to set the */
+ /* maximum ssh window size to the maximum hpn buffer size */
+ /* unless the user has specifically set the tcprcvbufpoll */
+ /* to no. In which case we *can* just set the window to the */
+ /* minimum of the hpn buffer size and tcp receive buffer size */
+
+ if(options.hpn_disabled)
+ {
+ options.hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT;
+ }
+ else if (datafellows & SSH_BUG_LARGEWINDOW)
+ {
+ debug("HPN to Non-HPN Connection");
+ if (options.hpn_buffer_size < 0)
+ options.hpn_buffer_size = 2*1024*1024;
+ }
+ else
+ {
+ if (options.hpn_buffer_size < 0)
+ options.hpn_buffer_size = BUFFER_MAX_LEN_HPN;
+
+ /*create a socket but don't connect it */
+ /* we use that the get the rcv socket size */
+ sock = socket(AF_INET, SOCK_STREAM, 0);
+ /* if they are using the tcp_rcv_buf option */
+ /* attempt to set the buffer size to that */
+ if (options.tcp_rcv_buf)
+ setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&options.tcp_rcv_buf,
+ sizeof(options.tcp_rcv_buf));
+ getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
+ &socksize, &socksizelen);
+ close(sock);
+ debug("socksize %d", socksize);
+ if (options.tcp_rcv_buf_poll <= 0)
+ {
+ options.hpn_buffer_size = MIN(socksize,options.hpn_buffer_size);
+ debug ("MIN of TCP RWIN and HPNBufferSize: %d", options.hpn_buffer_size);
+ }
+ else
+ {
+ if (options.tcp_rcv_buf > 0)
+ options.hpn_buffer_size = MIN(options.tcp_rcv_buf, options.hpn_buffer_size);
+ debug ("MIN of TCPRcvBuf and HPNBufferSize: %d", options.hpn_buffer_size);
+ }
+
+ }
+
+ debug("Final hpn_buffer_size = %d", options.hpn_buffer_size);
+
+ window = options.hpn_buffer_size;
+
packetmax = CHAN_SES_PACKET_DEFAULT;
if (tty_flag) {
window = 4*CHAN_SES_PACKET_DEFAULT;
window, packetmax, CHAN_EXTENDED_WRITE,
"client-session", /*nonblock*/0);
- if (!tty_flag && (!(datafellows & SSH_BUG_LARGEWINDOW))) {
+ if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) {
c->dynamic_window = 1;
+ debug ("Enabled Dynamic Window Scaling\n");
}
debug3("ssh_session2_open: channel_new: %d", c->self);
/* XXX should be pre-session */
ssh_init_forwarding();
- ssh_control_listener();
if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
id = ssh_session2_open();
options.permit_local_command)
ssh_local_cmd(options.local_command);
+ /* Start listening for multiplex clients */
+ ssh_control_listener();
+
/* If requested, let ssh continue in the background. */
if (fork_after_authentication_flag)
if (daemon(1, 1) < 0)
static void
load_public_identity_files(void)
{
- char *filename;
+ char *filename, *cp, thishost[NI_MAXHOST];
int i = 0;
Key *public;
+ struct passwd *pw;
#ifdef SMARTCARD
Key **keys;
if (options.smartcard_device != NULL &&
options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
- (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
+ (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
int count = 0;
for (i = 0; keys[i] != NULL; i++) {
count++;
xfree(keys);
}
#endif /* SMARTCARD */
+ if ((pw = getpwuid(original_real_uid)) == NULL)
+ fatal("load_public_identity_files: getpwuid failed");
+ if (gethostname(thishost, sizeof(thishost)) == -1)
+ fatal("load_public_identity_files: gethostname: %s",
+ strerror(errno));
for (; i < options.num_identity_files; i++) {
- filename = tilde_expand_filename(options.identity_files[i],
+ cp = tilde_expand_filename(options.identity_files[i],
original_real_uid);
+ filename = percent_expand(cp, "d", pw->pw_dir,
+ "u", pw->pw_name, "l", thishost, "h", host,
+ "r", options.user, (char *)NULL);
+ xfree(cp);
public = key_load_public(filename, NULL);
debug("identity file %s type %d", filename,
public ? public->type : -1);
static int
env_permitted(char *env)
{
- int i;
+ int i, ret;
char name[1024], *cp;
- strlcpy(name, env, sizeof(name));
- if ((cp = strchr(name, '=')) == NULL)
+ if ((cp = strchr(env, '=')) == NULL || cp == env)
return (0);
-
- *cp = '\0';
+ ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
+ if (ret <= 0 || (size_t)ret >= sizeof(name))
+ fatal("env_permitted: name '%.100s...' too long", env);
for (i = 0; i < options.num_send_env; i++)
if (match_pattern(name, options.send_env[i]))
control_client(const char *path)
{
struct sockaddr_un addr;
- int i, r, fd, sock, exitval, num_env, addr_len;
+ int i, r, fd, sock, exitval[2], num_env, addr_len;
Buffer m;
char *term;
extern char **environ;
if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
fatal("%s socket(): %s", __func__, strerror(errno));
- if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) {
+ if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
if (mux_command != SSHMUX_COMMAND_OPEN) {
fatal("Control socket connect(%.100s): %s", path,
strerror(errno));
}
if (errno == ENOENT)
- debug("Control socket \"%.100s\" does not exist", path);
+ debug("Control socket \"%.100s\" does not exist", path);
else {
- error("Control socket connect(%.100s): %s", path,
+ error("Control socket connect(%.100s): %s", path,
strerror(errno));
}
- close(sock);
- return;
- }
-
- if (stdin_null_flag) {
- if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
- fatal("open(/dev/null): %s", strerror(errno));
- if (dup2(fd, STDIN_FILENO) == -1)
- fatal("dup2: %s", strerror(errno));
- if (fd > STDERR_FILENO)
- close(fd);
- }
+ close(sock);
+ return;
+ }
+
+ if (stdin_null_flag) {
+ if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
+ fatal("open(/dev/null): %s", strerror(errno));
+ if (dup2(fd, STDIN_FILENO) == -1)
+ fatal("dup2: %s", strerror(errno));
+ if (fd > STDERR_FILENO)
+ close(fd);
+ }
term = getenv("TERM");
if (tty_flag)
enter_raw_mode();
- /* Stick around until the controlee closes the client_fd */
- exitval = 0;
- for (;!control_client_terminate;) {
- r = read(sock, &exitval, sizeof(exitval));
+ /*
+ * Stick around until the controlee closes the client_fd.
+ * Before it does, it is expected to write this process' exit
+ * value (one int). This process must read the value and wait for
+ * the closure of the client_fd; if this one closes early, the
+ * multiplex master will terminate early too (possibly losing data).
+ */
+ exitval[0] = 0;
+ for (i = 0; !control_client_terminate && i < (int)sizeof(exitval);) {
+ r = read(sock, (char *)exitval + i, sizeof(exitval) - i);
if (r == 0) {
debug2("Received EOF from master");
break;
}
- if (r > 0)
- debug2("Received exit status from master %d", exitval);
- if (r == -1 && errno != EINTR)
+ if (r == -1) {
+ if (errno == EINTR)
+ continue;
fatal("%s: read %s", __func__, strerror(errno));
+ }
+ i += r;
}
- if (control_client_terminate)
- debug2("Exiting on signal %d", control_client_terminate);
-
close(sock);
-
leave_raw_mode();
+ if (i > (int)sizeof(int))
+ fatal("%s: master returned too much data (%d > %lu)",
+ __func__, i, sizeof(int));
+ if (control_client_terminate) {
+ debug2("Exiting on signal %d", control_client_terminate);
+ exitval[0] = 255;
+ } else if (i < (int)sizeof(int)) {
+ debug2("Control master terminated unexpectedly");
+ exitval[0] = 255;
+ } else
+ debug2("Received exit status from master %d", exitval[0]);
if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
- fprintf(stderr, "Connection to master closed.\r\n");
+ fprintf(stderr, "Shared connection to %s closed.\r\n", host);
- exit(exitval);
+ exit(exitval[0]);
}
andersk / gssapi-openssh.git / blobdiff