*/
#include "includes.h"
-RCSID("$OpenBSD: ssh.c,v 1.96 2001/02/17 23:28:58 deraadt Exp $");
+RCSID("$OpenBSD: ssh.c,v 1.127 2001/06/26 20:14:11 markus Exp $");
#include <openssl/evp.h>
#include <openssl/err.h>
#include "misc.h"
#include "kex.h"
#include "mac.h"
+#include "sshtty.h"
+
+#ifdef SMARTCARD
+#include <openssl/engine.h>
+#include "scard.h"
+#endif
#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;
+/* Private host keys. */
+struct {
+ Key **keys;
+ int nkeys;
+} sensitive_data;
/* Original real UID. */
uid_t original_real_uid;
/* Should we execute a command or invoke a subsystem? */
int subsystem_flag = 0;
+#ifdef SMARTCARD
+/* Smartcard reader id */
+int sc_reader_num = -1;
+#endif
+
/* Prints a help message to the user. This function never returns. */
-void
+static void
usage(void)
{
fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
fprintf(stderr, " -l user Log in using this user name.\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");
+ fprintf(stderr, " -a Disable authentication agent forwarding (default).\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 Disable X11 connection forwarding.\n");
- fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
+ fprintf(stderr, " -x Disable X11 connection forwarding (default).\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, " -f Fork into background after authentication.\n");
fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
- fprintf(stderr, " -c cipher Select encryption algorithm: "
- "``3des'', "
- "``blowfish''\n");
+ fprintf(stderr, " -c cipher Select encryption algorithm\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, " -6 Use IPv6 only.\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");
+ fprintf(stderr, " -b addr Local IP address.\n");
exit(1);
}
* Connects to the given host using rsh (or prints an error message and exits
* if rsh is not available). This function never returns.
*/
-void
+static void
rsh_connect(char *host, char *user, Buffer * command)
{
char *args[10];
exit(1);
}
-int ssh_session(void);
-int ssh_session2(void);
-int guess_identity_file_type(const char *filename);
+static int ssh_session(void);
+static int ssh_session2(void);
+static void load_public_identity_files(void);
/*
* Main program for the ssh client.
{
int i, opt, optind, exit_status, ok;
u_short fwd_port, fwd_host_port;
- char *optarg, *cp, buf[256];
+ char *optarg, *p, *cp, buf[256];
struct stat st;
- struct passwd *pw, pwcopy;
+ struct passwd *pw;
int dummy;
uid_t original_effective_uid;
fatal("setrlimit failed: %.100s", strerror(errno));
}
#endif
+ /* Get user data. */
+ pw = getpwuid(original_real_uid);
+ if (!pw) {
+ log("You don't exist, go away!");
+ exit(1);
+ }
+ /* Take a copy of the returned structure. */
+ pw = pwcopy(pw);
+
/*
* Use uid-swapping to give up root privileges for the duration of
* option processing. We will re-instantiate the rights when we are
* them when the port has been created (actually, when the connection
* has been made, as we may need to create the port several times).
*/
- temporarily_use_uid(original_real_uid);
+ temporarily_use_uid(pw);
/*
* Set our umask to something reasonable, as some files are created
if (av[optind][0] != '-') {
if (host)
break;
- if ((cp = strchr(av[optind], '@'))) {
- if(cp == av[optind])
+ if (strchr(av[optind], '@')) {
+ p = xstrdup(av[optind]);
+ cp = strchr(p, '@');
+ if(cp == NULL || cp == p)
usage();
- options.user = av[optind];
+ options.user = p;
*cp = '\0';
host = ++cp;
} else
opt = av[optind][1];
if (!opt)
usage();
- if (strchr("eilcmpLRo", opt)) { /* options with arguments */
+ if (strchr("eilcmpbILRDo", opt)) { /* options with arguments */
optarg = av[optind] + 2;
if (strcmp(optarg, "") == 0) {
if (optind >= ac - 1)
SSH_MAX_IDENTITY_FILES);
options.identity_files[options.num_identity_files++] = xstrdup(optarg);
break;
+ case 'I':
+#ifdef SMARTCARD
+ sc_reader_num = atoi(optarg);
+#else
+ fprintf(stderr, "no support for smartcards.\n");
+#endif
+ break;
case 't':
if (tty_flag)
force_tty_flag = 1;
options.log_level++;
break;
} else {
- fatal("Too high debugging level.\n");
+ fatal("Too high debugging level.");
}
/* fallthrough */
case 'V':
else if (strlen(optarg) == 1)
options.escape_char = (u_char) optarg[0];
else if (strcmp(optarg, "none") == 0)
- options.escape_char = -2;
+ options.escape_char = SSH_ESCAPECHAR_NONE;
else {
fprintf(stderr, "Bad escape character '%s'.\n", optarg);
exit(1);
}
break;
case 'p':
- options.port = atoi(optarg);
+ options.port = a2port(optarg);
+ if (options.port == 0) {
+ fprintf(stderr, "Bad port '%s'\n", optarg);
+ exit(1);
+ }
break;
case 'l':
options.user = optarg;
}
add_local_forward(&options, fwd_port, buf, fwd_host_port);
break;
+
+ case 'D':
+ fwd_port = a2port(optarg);
+ if (fwd_port == 0) {
+ fprintf(stderr, "Bad dynamic port '%s'\n", optarg);
+ exit(1);
+ }
+ add_local_forward(&options, fwd_port, "socks4", 0);
+ break;
+
case 'C':
options.compression = 1;
break;
case 's':
subsystem_flag = 1;
break;
+ case 'b':
+ options.bind_address = optarg;
+ break;
default:
usage();
}
/* No command specified - execute shell on a tty. */
tty_flag = 1;
if (subsystem_flag) {
- fprintf(stderr, "You must specify a subsystem to invoke.");
+ fprintf(stderr, "You must specify a subsystem to invoke.\n");
usage();
}
} else {
/* 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");
- 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;
-
- /* 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], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
+ SYSLOG_FACILITY_USER, 1);
/* Read per-user configuration file. */
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
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);
"originating port will not be trusted.");
options.rhosts_authentication = 0;
}
+
/*
* If using rsh has been selected, exec it now (without trying
* anything else). Note that we must release privileges first.
restore_uid();
/* Switch to the original uid permanently. */
- permanently_set_uid(original_real_uid);
+ permanently_set_uid(pw);
/* Execute rsh. */
rsh_connect(host, options.user, &command);
ok = ssh_connect(host, &hostaddr, options.port,
options.connection_attempts,
original_effective_uid != 0 || !options.use_privileged_port,
- original_real_uid,
- options.proxy_command);
+ pw, options.proxy_command);
/*
* If we successfully made the connection, load the host private key
* authentication. This must be done before releasing extra
* 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(_PATH_HOST_KEY_FILE, "", &k, NULL))
- host_private_key_loaded = 1;
+ sensitive_data.nkeys = 0;
+ sensitive_data.keys = NULL;
+ if (ok && (options.rhosts_rsa_authentication ||
+ options.hostbased_authentication)) {
+ sensitive_data.nkeys = 3;
+ sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
+ sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
+ _PATH_HOST_KEY_FILE, "", NULL);
+ sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
+ _PATH_HOST_DSA_KEY_FILE, "", NULL);
+ sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
+ _PATH_HOST_RSA_KEY_FILE, "", NULL);
}
/*
* Get rid of any extra privileges that we may have. We will no
* process, read the private hostkey and impersonate the host.
* OpenBSD does not allow ptracing of setuid processes.
*/
- permanently_set_uid(original_real_uid);
+ permanently_set_uid(pw);
/*
* Now that we are back to our own permissions, create ~/.ssh
}
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);
-
- /* We no longer need the host private key. Clear it now. */
- if (host_private_key_loaded)
- RSA_free(host_private_key); /* Destroys contents safely */
+ ssh_login(sensitive_data.keys, sensitive_data.nkeys,
+ host, (struct sockaddr *)&hostaddr, pw);
+
+ /* We no longer need the private host keys. Clear them now. */
+ if (sensitive_data.nkeys != 0) {
+ for (i = 0; i < sensitive_data.nkeys; i++) {
+ if (sensitive_data.keys[i] != NULL) {
+ /* Destroys contents safely */
+ debug3("clear hostkey %d", i);
+ key_free(sensitive_data.keys[i]);
+ sensitive_data.keys[i] = NULL;
+ }
+ }
+ xfree(sensitive_data.keys);
+ }
exit_status = compat20 ? ssh_session2() : ssh_session();
packet_close();
return exit_status;
}
-void
+static void
x11_get_proto(char *proto, int proto_len, char *data, int data_len)
{
char line[512];
}
}
-void
+static void
ssh_init_forwarding(void)
{
int success = 0;
}
}
-void
+static void
check_agent_present(void)
{
if (options.forward_agent) {
}
}
-int
+static int
ssh_session(void)
{
int type;
cp = getenv("TERM");
if (!cp)
cp = "";
- packet_put_string(cp, strlen(cp));
+ packet_put_cstring(cp);
/* Store window size in the packet. */
if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
packet_put_int(ws.ws_ypixel);
/* Store tty modes in the packet. */
- tty_make_modes(fileno(stdin));
+ tty_make_modes(fileno(stdin), NULL);
/* Send the packet, and wait for it to leave. */
packet_send();
}
/* Enter the interactive session. */
- return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
+ return client_loop(have_tty, tty_flag ?
+ options.escape_char : SSH_ESCAPECHAR_NONE, 0);
}
-void
+static void
client_subsystem_reply(int type, int plen, void *ctxt)
{
int id, len;
id = packet_get_int();
len = buffer_len(&command);
- len = MAX(len, 900);
+ 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
+static void
ssh_session2_callback(int id, void *arg)
{
int len;
int interactive = 0;
+ struct termios tio;
debug("client_init id %d arg %ld", id, (long)arg);
- if (no_shell_flag)
- goto done;
-
if (tty_flag) {
struct winsize ws;
char *cp;
packet_put_int(ws.ws_row);
packet_put_int(ws.ws_xpixel);
packet_put_int(ws.ws_ypixel);
- packet_put_cstring(""); /* XXX: encode terminal modes */
+ tio = get_saved_tio();
+ tty_make_modes(/*ignored*/ 0, &tio);
packet_send();
interactive = 1;
/* XXX wait for reply */
debug("Sending command: %.*s", len, buffer_ptr(&command));
channel_request_start(id, "exec", 0);
}
- packet_put_string(buffer_ptr(&command), len);
+ 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);
}
-int
-ssh_session2(void)
+static int
+ssh_session2_command(void)
{
- int window, packetmax, id;
- int in, out, err;
+ Channel *c;
+ int window, packetmax, in, out, err;
if (stdin_null_flag) {
in = open(_PATH_DEVNULL, O_RDONLY);
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 *= 2;
packetmax *=2;
}
- id = channel_new(
+ c = channel_new(
"session", SSH_CHANNEL_OPENING, in, out, err,
window, packetmax, CHAN_EXTENDED_WRITE,
xstrdup("client-session"), /*nonblock*/0);
+ if (c == NULL)
+ fatal("ssh_session2_command: channel_new failed");
+
+ debug3("ssh_session2_command: channel_new: %d", c->self);
- channel_open(id);
- channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
+ channel_send_open(c->self);
+ channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
ssh_session2_callback, (void *)0);
- return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
+ return c->self;
}
-int
-guess_identity_file_type(const char *filename)
+static int
+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 : SSH_ESCAPECHAR_NONE, id);
+}
+
+static 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;
+ 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;
}
- public = key_new(type);
- if (!load_public_key(filename, public, NULL)) {
- /* ok, so we will assume this is 'some' key */
- type = KEY_UNSPEC;
+#ifdef SMARTCARD
+ if (sc_reader_num != -1 &&
+ options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
+ (public = sc_get_key(sc_reader_num)) != NULL ) {
+ Key *new;
+
+ /* XXX ssh1 vs ssh2 */
+ new = key_new(KEY_RSA);
+ new->flags = KEY_FLAG_EXT;
+ BN_copy(new->rsa->n, public->rsa->n);
+ BN_copy(new->rsa->e, public->rsa->e);
+ RSA_set_method(new->rsa, sc_get_engine());
+ i = options.num_identity_files++;
+ options.identity_keys[i] = new;
+ options.identity_files[i] = xstrdup("smartcard rsa key");;
+
+ new = key_new(KEY_RSA1);
+ new->flags = KEY_FLAG_EXT;
+ BN_copy(new->rsa->n, public->rsa->n);
+ BN_copy(new->rsa->e, public->rsa->e);
+ RSA_set_method(new->rsa, sc_get_engine());
+ i = options.num_identity_files++;
+ options.identity_keys[i] = new;
+ options.identity_files[i] = xstrdup("smartcard rsa1 key");;
+
+ key_free(public);
}
- key_free(public);
- return type;
+#endif
}
andersk / openssh.git / blobdiff