*/
#include "includes.h"
-RCSID("$OpenBSD: ssh.c,v 1.82 2001/01/15 21:40:10 markus Exp $");
+RCSID("$OpenBSD: ssh.c,v 1.106 2001/04/05 21:05:24 markus Exp $");
#include <openssl/evp.h>
-#include <openssl/dsa.h>
-#include <openssl/rsa.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 "readconf.h"
#include "uidswap.h"
-
-#include "ssh2.h"
-#include "compat.h"
#include "channels.h"
#include "key.h"
#include "authfd.h"
#include "authfile.h"
+#include "pathnames.h"
#include "clientloop.h"
+#include "log.h"
+#include "readconf.h"
+#include "sshconnect.h"
+#include "tildexpand.h"
+#include "dispatch.h"
+#include "misc.h"
+#include "kex.h"
+#include "mac.h"
#ifdef HAVE___PROGNAME
extern char *__progname;
*/
volatile int received_window_change_signal = 0;
-/* Flag indicating whether we have a valid host private key loaded. */
-int host_private_key_loaded = 0;
-
/* Host private key. */
-RSA *host_private_key = NULL;
+Key *host_private_key = NULL;
/* Original real UID. */
uid_t original_real_uid;
/* command to be executed */
Buffer command;
+/* Should we execute a command or invoke a subsystem? */
+int subsystem_flag = 0;
+
/* Prints a help message to the user. This function never returns. */
void
-usage()
+usage(void)
{
fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -l user Log in using this user name.\n");
- fprintf(stderr, " -n Redirect input from /dev/null.\n");
+ fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
fprintf(stderr, " -A Enable authentication agent forwarding.\n");
fprintf(stderr, " -a Disable authentication agent forwarding.\n");
#ifdef AFS
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
#endif /* AFS */
- fprintf(stderr, " -X Enable X11 connection forwarding.\n");
+ fprintf(stderr, " -X Enable X11 connection forwarding.\n");
fprintf(stderr, " -x Disable X11 connection forwarding.\n");
- fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
+ fprintf(stderr, " -i file Identity for public key authentication "
+ "(default: ~/.ssh/identity)\n");
fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
fprintf(stderr, " -T Do not allocate a tty.\n");
fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
fprintf(stderr, " -c cipher Select encryption algorithm: "
- "``3des'', "
- "``blowfish''\n");
+ "``3des'', ``blowfish''\n");
+ fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
fprintf(stderr, " -C Enable compression.\n");
fprintf(stderr, " -N Do not execute a shell or command.\n");
fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
+ fprintf(stderr, " -1 Force protocol version 1.\n");
+ fprintf(stderr, " -2 Force protocol version 2.\n");
fprintf(stderr, " -4 Use IPv4 only.\n");
fprintf(stderr, " -6 Use IPv6 only.\n");
- fprintf(stderr, " -2 Force protocol version 2.\n");
fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
+ fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
exit(1);
}
int ssh_session(void);
int ssh_session2(void);
-int guess_identity_file_type(const char *filename);
+void load_public_identity_files(void);
/*
* Main program for the ssh client.
u_short fwd_port, fwd_host_port;
char *optarg, *cp, buf[256];
struct stat st;
- struct passwd *pw, pwcopy;
+ struct passwd *pw;
int dummy;
uid_t original_effective_uid;
/* Parse command-line arguments. */
host = NULL;
- /* If program name is not one of the standard names, use it as host name. */
- cp = __progname;
-#ifdef HAVE_CYGWIN
- if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") &&
- strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") &&
- strcasecmp(cp, "remsh") &&
- strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") &&
- strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") &&
- strcasecmp(cp, "remsh.exe"))
-#else
- if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") &&
- strcmp(cp, "slogin") && strcmp(cp, "remsh"))
-#endif
- host = cp;
-
for (optind = 1; optind < ac; optind++) {
if (av[optind][0] != '-') {
if (host)
opt = av[optind][1];
if (!opt)
usage();
- if (strchr("eilcpLRo", opt)) { /* options with arguments */
+ if (strchr("eilcmpLRo", opt)) { /* options with arguments */
optarg = av[optind] + 2;
if (strcmp(optarg, "") == 0) {
if (optind >= ac - 1)
optarg = NULL;
}
switch (opt) {
+ case '1':
+ options.protocol = SSH_PROTO_1;
+ break;
case '2':
options.protocol = SSH_PROTO_2;
break;
options.log_level++;
break;
} else {
- fatal("Too high debugging level.\n");
+ fatal("Too high debugging level.");
}
/* fallthrough */
case 'V':
- fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n",
+ fprintf(stderr,
+ "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
SSH_VERSION,
PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
- PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
- fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay());
+ PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
+ SSLeay());
if (opt == 'V')
exit(0);
break;
}
}
break;
+ case 'm':
+ if (mac_valid(optarg))
+ options.macs = xstrdup(optarg);
+ else {
+ fprintf(stderr, "Unknown mac type '%s'\n", optarg);
+ exit(1);
+ }
+ break;
case 'p':
options.port = atoi(optarg);
break;
"command-line", 0, &dummy) != 0)
exit(1);
break;
+ case 's':
+ subsystem_flag = 1;
+ break;
default:
usage();
}
if (optind == ac) {
/* No command specified - execute shell on a tty. */
tty_flag = 1;
+ if (subsystem_flag) {
+ fprintf(stderr, "You must specify a subsystem to invoke.");
+ usage();
+ }
} else {
/* A command has been specified. Store it into the
buffer. */
/* Do not allocate a tty if stdin is not a tty. */
if (!isatty(fileno(stdin)) && !force_tty_flag) {
if (tty_flag)
- log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
+ log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
tty_flag = 0;
}
/* Get user data. */
pw = getpwuid(original_real_uid);
if (!pw) {
- log("You don't exist, go away!\n");
+ log("You don't exist, go away!");
exit(1);
}
/* Take a copy of the returned structure. */
- memset(&pwcopy, 0, sizeof(pwcopy));
- pwcopy.pw_name = xstrdup(pw->pw_name);
- pwcopy.pw_passwd = xstrdup(pw->pw_passwd);
- pwcopy.pw_uid = pw->pw_uid;
- pwcopy.pw_gid = pw->pw_gid;
-#ifdef HAVE_PW_CLASS_IN_PASSWD
- pwcopy.pw_class = xstrdup(pw->pw_class);
-#endif
- pwcopy.pw_dir = xstrdup(pw->pw_dir);
- pwcopy.pw_shell = xstrdup(pw->pw_shell);
- pw = &pwcopy;
+ pw = pwcopy(pw);
- /* Initialize "log" output. Since we are the client all output
- actually goes to the terminal. */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
+ /*
+ * Initialize "log" output. Since we are the client all output
+ * actually goes to stderr.
+ */
+ log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
/* Read per-user configuration file. */
- snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE);
+ snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
read_config_file(buf, host, &options);
/* Read systemwide configuration file. */
- read_config_file(HOST_CONFIG_FILE, host, &options);
+ read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
/* Fill configuration defaults. */
fill_default_options(&options);
/* reinit */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
+ log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
+
+ seed_rng();
if (options.user == NULL)
options.user = xstrdup(pw->pw_name);
* privileges, because the file is only readable by root.
*/
if (ok && (options.protocol & SSH_PROTO_1)) {
- Key k;
- host_private_key = RSA_new();
- k.type = KEY_RSA1;
- k.rsa = host_private_key;
- if (load_private_key(HOST_KEY_FILE, "", &k, NULL))
- host_private_key_loaded = 1;
+ host_private_key = key_load_private_type(KEY_RSA1,
+ _PATH_HOST_KEY_FILE, "", NULL);
}
/*
* Get rid of any extra privileges that we may have. We will no
* Now that we are back to our own permissions, create ~/.ssh
* directory if it doesn\'t already exist.
*/
- snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR);
+ snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
if (stat(buf, &st) < 0)
if (mkdir(buf, 0700) < 0)
error("Could not create directory '%.200s'.", buf);
}
exit(1);
}
- /* Expand ~ in options.identity_files, known host file names. */
- /* XXX mem-leaks */
- for (i = 0; i < options.num_identity_files; i++) {
- options.identity_files[i] =
- tilde_expand_filename(options.identity_files[i], original_real_uid);
- options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]);
- debug("identity file %s type %d", options.identity_files[i],
- options.identity_files_type[i]);
- }
+ /* load options.identity_files */
+ load_public_identity_files();
+
+ /* Expand ~ in known host file names. */
+ /* XXX mem-leaks: */
options.system_hostfile =
tilde_expand_filename(options.system_hostfile, original_real_uid);
options.user_hostfile =
tilde_expand_filename(options.user_hostfile2, original_real_uid);
/* Log into the remote system. This never returns if the login fails. */
- ssh_login(host_private_key_loaded, host_private_key,
- host, (struct sockaddr *)&hostaddr, original_real_uid);
+ ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr,
+ original_real_uid);
/* We no longer need the host private key. Clear it now. */
- if (host_private_key_loaded)
- RSA_free(host_private_key); /* Destroys contents safely */
+ if (host_private_key != NULL)
+ key_free(host_private_key); /* Destroys contents safely */
exit_status = compat20 ? ssh_session2() : ssh_session();
packet_close();
if (options.xauth_location) {
/* Try to get Xauthority information for the display. */
- snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null",
+ snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
options.xauth_location, getenv("DISPLAY"));
f = popen(line, "r");
if (f && fgets(line, sizeof(line), f) &&
void
ssh_init_forwarding(void)
{
+ int success = 0;
int i;
+
/* Initiate local TCP/IP port forwardings. */
for (i = 0; i < options.num_local_forwards; i++) {
debug("Connections to local port %d forwarded to remote address %.200s:%d",
options.local_forwards[i].port,
options.local_forwards[i].host,
options.local_forwards[i].host_port);
- channel_request_local_forwarding(
+ success += channel_request_local_forwarding(
options.local_forwards[i].port,
options.local_forwards[i].host,
options.local_forwards[i].host_port,
options.gateway_ports);
}
+ if (i > 0 && success == 0)
+ error("Could not request local forwarding.");
/* Initiate remote TCP/IP port forwardings. */
for (i = 0; i < options.num_remote_forwards; i++) {
return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
}
+void
+client_subsystem_reply(int type, int plen, void *ctxt)
+{
+ int id, len;
+
+ id = packet_get_int();
+ len = buffer_len(&command);
+ if (len > 900)
+ len = 900;
+ packet_done();
+ if (type == SSH2_MSG_CHANNEL_FAILURE)
+ fatal("Request for subsystem '%.*s' failed on channel %d",
+ len, buffer_ptr(&command), id);
+}
+
void
ssh_session2_callback(int id, void *arg)
{
int len;
int interactive = 0;
- debug("client_init id %d arg %d", id, (int)arg);
-
- if (no_shell_flag)
- goto done;
+ debug("client_init id %d arg %ld", id, (long)arg);
if (tty_flag) {
struct winsize ws;
if (len > 0) {
if (len > 900)
len = 900;
- debug("Sending command: %.*s", len, buffer_ptr(&command));
- channel_request_start(id, "exec", 0);
- packet_put_string(buffer_ptr(&command), len);
+ if (subsystem_flag) {
+ debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
+ channel_request_start(id, "subsystem", /*want reply*/ 1);
+ /* register callback for reply */
+ /* XXX we asume that client_loop has already been called */
+ dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
+ dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
+ } else {
+ debug("Sending command: %.*s", len, buffer_ptr(&command));
+ channel_request_start(id, "exec", 0);
+ }
+ packet_put_string(buffer_ptr(&command), buffer_len(&command));
packet_send();
} else {
channel_request(id, "shell", 0);
}
/* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
-done:
+
/* register different callback, etc. XXX */
packet_set_interactive(interactive);
- clientloop_set_session_ident(id);
}
int
-ssh_session2(void)
+ssh_session2_command(void)
{
- int window, packetmax, id;
+ int id, window, packetmax;
int in, out, err;
if (stdin_null_flag) {
- in = open("/dev/null", O_RDONLY);
+ in = open(_PATH_DEVNULL, O_RDONLY);
} else {
in = dup(STDIN_FILENO);
}
if (!isatty(err))
set_nonblock(err);
- /* XXX should be pre-session */
- ssh_init_forwarding();
-
- /* If requested, let ssh continue in the background. */
- if (fork_after_authentication_flag)
- if (daemon(1, 1) < 0)
- fatal("daemon() failed: %.200s", strerror(errno));
-
window = CHAN_SES_WINDOW_DEFAULT;
packetmax = CHAN_SES_PACKET_DEFAULT;
if (!tty_flag) {
window, packetmax, CHAN_EXTENDED_WRITE,
xstrdup("client-session"), /*nonblock*/0);
+debug("channel_new: %d", id);
+
channel_open(id);
channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
ssh_session2_callback, (void *)0);
- return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
+ return id;
}
int
-guess_identity_file_type(const char *filename)
+ssh_session2(void)
{
- struct stat st;
+ int id;
+
+ /* XXX should be pre-session */
+ ssh_init_forwarding();
+
+ id = no_shell_flag ? -1 : ssh_session2_command();
+
+ /* If requested, let ssh continue in the background. */
+ if (fork_after_authentication_flag)
+ if (daemon(1, 1) < 0)
+ fatal("daemon() failed: %.200s", strerror(errno));
+
+ return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
+}
+
+void
+load_public_identity_files(void)
+{
+ char *filename;
Key *public;
- int type = KEY_RSA1; /* default */
+ int i;
- if (stat(filename, &st) < 0) {
- /* ignore this key */
- return KEY_UNSPEC;
- }
- public = key_new(type);
- if (!load_public_key(filename, public, NULL)) {
- /* ok, so we will assume this is 'some' key */
- type = KEY_UNSPEC;
+ for (i = 0; i < options.num_identity_files; i++) {
+ filename = tilde_expand_filename(options.identity_files[i],
+ original_real_uid);
+ public = key_load_public(filename, NULL);
+ debug("identity file %s type %d", filename,
+ public ? public->type : -1);
+ xfree(options.identity_files[i]);
+ options.identity_files[i] = filename;
+ options.identity_keys[i] = public;
}
- key_free(public);
- return type;
}
andersk / openssh.git / blobdiff