mirror of
https://git.tartarus.org/simon/putty.git
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787c358d37
When the user provides a password on the PuTTY command line, via -pw or -pwfile, the flag 'tried_once' inside cmdline_get_passwd_input() is intended to arrange that we only try sending that password once, and after we've sent it, we don't try again. But this plays badly with the 'Restart Session' operation. If the connection is lost and then restarted at user request, we _do_ want to send that password again! So this commit moves that static variable out into a small state structure held by the client of cmdline_get_passwd_input. Each client can decide how to manage that state itself. Clients that support 'Restart Session' - i.e. just GUI PuTTY itself - will initialise the state at the same time as instantiating the backend, so that every time the session is restarted, we return to (correctly) believing that we _haven't_ yet tried the password provided on the command line. But clients that don't support 'Restart Session' - i.e. Plink and file transfer tools - can do the same thing that cmdline.c was doing before: just keep the state in a static variable. This also means that the GUI login tools will now retain the command-line password in memory, whereas previously they'd have wiped it out once it was used. But the other tools will still wipe and free the password, because I've also added a 'bool restartable' flag to cmdline_get_passwd_input to let it know when it _is_ allowed to do that. In the GUI tools, I don't see any way to get round that, because if the session is restarted you _have_ to still have the password to use again. (And you can't infer that that will never happen from the CONF_close_on_exit setting, because that too could be changed in mid-session.) On the other hand, I think it's not all that worrying, because the use of either -pw or -pwfile means that a persistent copy of your password is *already* stored somewhere, so another one isn't too big a stretch. (Due to the change of -pw policy in 0.77, the effect of this bug was that an attempt to reconnect in a session set up this way would lead to "Configured password was not accepted". In 0.76, the failure mode was different: PuTTY would interactively prompt for the password, having wiped it out of memory after it was used the first time round.)
555 lines
19 KiB
C
555 lines
19 KiB
C
/*
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* PLink - a Windows command-line (stdin/stdout) variant of PuTTY.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <stdarg.h>
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#include "putty.h"
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#include "storage.h"
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#include "tree234.h"
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#include "security-api.h"
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void cmdline_error(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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console_print_error_msg_fmt_v("plink", fmt, ap);
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va_end(ap);
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exit(1);
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}
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static HANDLE inhandle, outhandle, errhandle;
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static struct handle *stdin_handle, *stdout_handle, *stderr_handle;
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static handle_sink stdout_hs, stderr_hs;
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static StripCtrlChars *stdout_scc, *stderr_scc;
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static BinarySink *stdout_bs, *stderr_bs;
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static DWORD orig_console_mode;
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static Backend *backend;
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static LogContext *logctx;
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static Conf *conf;
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static void plink_echoedit_update(Seat *seat, bool echo, bool edit)
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{
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/* Update stdin read mode to reflect changes in line discipline. */
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DWORD mode;
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mode = ENABLE_PROCESSED_INPUT;
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if (echo)
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mode = mode | ENABLE_ECHO_INPUT;
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else
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mode = mode & ~ENABLE_ECHO_INPUT;
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if (edit)
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mode = mode | ENABLE_LINE_INPUT;
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else
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mode = mode & ~ENABLE_LINE_INPUT;
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SetConsoleMode(inhandle, mode);
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}
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static size_t plink_output(
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Seat *seat, SeatOutputType type, const void *data, size_t len)
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{
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bool is_stderr = type != SEAT_OUTPUT_STDOUT;
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BinarySink *bs = is_stderr ? stderr_bs : stdout_bs;
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put_data(bs, data, len);
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return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
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}
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static bool plink_eof(Seat *seat)
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{
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handle_write_eof(stdout_handle);
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return false; /* do not respond to incoming EOF with outgoing */
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}
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static SeatPromptResult plink_get_userpass_input(Seat *seat, prompts_t *p)
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{
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/* Plink doesn't support Restart Session, so we can just have a
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* single static cmdline_get_passwd_input_state that's never reset */
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static cmdline_get_passwd_input_state cmdline_state =
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CMDLINE_GET_PASSWD_INPUT_STATE_INIT;
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SeatPromptResult spr;
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spr = cmdline_get_passwd_input(p, &cmdline_state, false);
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if (spr.kind == SPRK_INCOMPLETE)
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spr = console_get_userpass_input(p);
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return spr;
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}
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static bool plink_seat_interactive(Seat *seat)
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{
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return (!*conf_get_str(conf, CONF_remote_cmd) &&
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!*conf_get_str(conf, CONF_remote_cmd2) &&
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!*conf_get_str(conf, CONF_ssh_nc_host));
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}
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static const SeatVtable plink_seat_vt = {
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.output = plink_output,
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.eof = plink_eof,
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.sent = nullseat_sent,
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.banner = nullseat_banner_to_stderr,
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.get_userpass_input = plink_get_userpass_input,
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.notify_session_started = nullseat_notify_session_started,
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.notify_remote_exit = nullseat_notify_remote_exit,
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.notify_remote_disconnect = nullseat_notify_remote_disconnect,
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.connection_fatal = console_connection_fatal,
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.update_specials_menu = nullseat_update_specials_menu,
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.get_ttymode = nullseat_get_ttymode,
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.set_busy_status = nullseat_set_busy_status,
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.confirm_ssh_host_key = console_confirm_ssh_host_key,
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.confirm_weak_crypto_primitive = console_confirm_weak_crypto_primitive,
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.confirm_weak_cached_hostkey = console_confirm_weak_cached_hostkey,
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.is_utf8 = nullseat_is_never_utf8,
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.echoedit_update = plink_echoedit_update,
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.get_x_display = nullseat_get_x_display,
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.get_windowid = nullseat_get_windowid,
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.get_window_pixel_size = nullseat_get_window_pixel_size,
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.stripctrl_new = console_stripctrl_new,
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.set_trust_status = console_set_trust_status,
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.can_set_trust_status = console_can_set_trust_status,
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.has_mixed_input_stream = console_has_mixed_input_stream,
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.verbose = cmdline_seat_verbose,
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.interactive = plink_seat_interactive,
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.get_cursor_position = nullseat_get_cursor_position,
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};
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static Seat plink_seat[1] = {{ &plink_seat_vt }};
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static DWORD main_thread_id;
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/*
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* Short description of parameters.
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*/
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static void usage(void)
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{
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printf("Plink: command-line connection utility\n");
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printf("%s\n", ver);
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printf("Usage: plink [options] [user@]host [command]\n");
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printf(" (\"host\" can also be a PuTTY saved session name)\n");
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printf("Options:\n");
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printf(" -V print version information and exit\n");
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printf(" -pgpfp print PGP key fingerprints and exit\n");
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printf(" -v show verbose messages\n");
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printf(" -load sessname Load settings from saved session\n");
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printf(" -ssh -telnet -rlogin -raw -serial\n");
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printf(" force use of a particular protocol\n");
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printf(" -ssh-connection\n");
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printf(" force use of the bare ssh-connection protocol\n");
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printf(" -P port connect to specified port\n");
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printf(" -l user connect with specified username\n");
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printf(" -batch disable all interactive prompts\n");
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printf(" -proxycmd command\n");
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printf(" use 'command' as local proxy\n");
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printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
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printf(" Specify the serial configuration (serial only)\n");
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printf("The following options only apply to SSH connections:\n");
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printf(" -pwfile file login with password read from specified file\n");
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printf(" -D [listen-IP:]listen-port\n");
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printf(" Dynamic SOCKS-based port forwarding\n");
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printf(" -L [listen-IP:]listen-port:host:port\n");
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printf(" Forward local port to remote address\n");
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printf(" -R [listen-IP:]listen-port:host:port\n");
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printf(" Forward remote port to local address\n");
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printf(" -X -x enable / disable X11 forwarding\n");
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printf(" -A -a enable / disable agent forwarding\n");
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printf(" -t -T enable / disable pty allocation\n");
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printf(" -1 -2 force use of particular SSH protocol version\n");
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printf(" -4 -6 force use of IPv4 or IPv6\n");
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printf(" -C enable compression\n");
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printf(" -i key private key file for user authentication\n");
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printf(" -noagent disable use of Pageant\n");
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printf(" -agent enable use of Pageant\n");
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printf(" -no-trivial-auth\n");
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printf(" disconnect if SSH authentication succeeds trivially\n");
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printf(" -noshare disable use of connection sharing\n");
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printf(" -share enable use of connection sharing\n");
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printf(" -hostkey keyid\n");
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printf(" manually specify a host key (may be repeated)\n");
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printf(" -sanitise-stderr, -sanitise-stdout, "
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"-no-sanitise-stderr, -no-sanitise-stdout\n");
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printf(" do/don't strip control chars from standard "
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"output/error\n");
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printf(" -no-antispoof omit anti-spoofing prompt after "
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"authentication\n");
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printf(" -m file read remote command(s) from file\n");
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printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
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printf(" -N don't start a shell/command (SSH-2 only)\n");
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printf(" -nc host:port\n");
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printf(" open tunnel in place of session (SSH-2 only)\n");
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printf(" -sshlog file\n");
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printf(" -sshrawlog file\n");
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printf(" log protocol details to a file\n");
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printf(" -logoverwrite\n");
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printf(" -logappend\n");
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printf(" control what happens when a log file already exists\n");
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printf(" -shareexists\n");
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printf(" test whether a connection-sharing upstream exists\n");
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exit(1);
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}
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static void version(void)
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{
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char *buildinfo_text = buildinfo("\n");
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printf("plink: %s\n%s\n", ver, buildinfo_text);
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sfree(buildinfo_text);
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exit(0);
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}
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size_t stdin_gotdata(struct handle *h, const void *data, size_t len, int err)
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{
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if (err) {
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char buf[4096];
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err, 0,
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buf, lenof(buf), NULL);
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buf[lenof(buf)-1] = '\0';
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if (buf[strlen(buf)-1] == '\n')
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buf[strlen(buf)-1] = '\0';
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fprintf(stderr, "Unable to read from standard input: %s\n", buf);
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cleanup_exit(0);
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}
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noise_ultralight(NOISE_SOURCE_IOLEN, len);
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if (backend_connected(backend)) {
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if (len > 0) {
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backend_send(backend, data, len);
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return backend_sendbuffer(backend);
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} else {
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backend_special(backend, SS_EOF, 0);
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return 0;
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}
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} else
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return 0;
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}
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void stdouterr_sent(struct handle *h, size_t new_backlog, int err, bool close)
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{
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if (close) {
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CloseHandle(outhandle);
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CloseHandle(errhandle);
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outhandle = errhandle = INVALID_HANDLE_VALUE;
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}
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if (err) {
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char buf[4096];
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err, 0,
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buf, lenof(buf), NULL);
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buf[lenof(buf)-1] = '\0';
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if (buf[strlen(buf)-1] == '\n')
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buf[strlen(buf)-1] = '\0';
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fprintf(stderr, "Unable to write to standard %s: %s\n",
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(h == stdout_handle ? "output" : "error"), buf);
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cleanup_exit(0);
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}
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if (backend_connected(backend)) {
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backend_unthrottle(backend, (handle_backlog(stdout_handle) +
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handle_backlog(stderr_handle)));
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}
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}
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const bool share_can_be_downstream = true;
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const bool share_can_be_upstream = true;
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const unsigned cmdline_tooltype =
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TOOLTYPE_HOST_ARG |
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TOOLTYPE_HOST_ARG_CAN_BE_SESSION |
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TOOLTYPE_HOST_ARG_PROTOCOL_PREFIX |
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TOOLTYPE_HOST_ARG_FROM_LAUNCHABLE_LOAD;
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static bool sending;
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static bool plink_mainloop_pre(void *vctx, const HANDLE **extra_handles,
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size_t *n_extra_handles)
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{
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if (!sending && backend_sendok(backend)) {
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stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
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0);
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sending = true;
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}
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return true;
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}
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static bool plink_mainloop_post(void *vctx, size_t extra_handle_index)
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{
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if (sending)
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handle_unthrottle(stdin_handle, backend_sendbuffer(backend));
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if (!backend_connected(backend) &&
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handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 0)
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return false; /* we closed the connection */
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return true;
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}
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int main(int argc, char **argv)
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{
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int exitcode;
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bool errors;
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bool use_subsystem = false;
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bool just_test_share_exists = false;
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enum TriState sanitise_stdout = AUTO, sanitise_stderr = AUTO;
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const struct BackendVtable *vt;
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dll_hijacking_protection();
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/*
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* Initialise port and protocol to sensible defaults. (These
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* will be overridden by more or less anything.)
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*/
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settings_set_default_protocol(PROT_SSH);
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settings_set_default_port(22);
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/*
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* Process the command line.
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*/
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conf = conf_new();
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do_defaults(NULL, conf);
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settings_set_default_protocol(conf_get_int(conf, CONF_protocol));
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settings_set_default_port(conf_get_int(conf, CONF_port));
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errors = false;
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{
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/*
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* Override the default protocol if PLINK_PROTOCOL is set.
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*/
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char *p = getenv("PLINK_PROTOCOL");
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if (p) {
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const struct BackendVtable *vt = backend_vt_from_name(p);
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if (vt) {
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settings_set_default_protocol(vt->protocol);
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settings_set_default_port(vt->default_port);
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conf_set_int(conf, CONF_protocol, vt->protocol);
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conf_set_int(conf, CONF_port, vt->default_port);
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}
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}
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}
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while (--argc) {
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char *p = *++argv;
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int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
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1, conf);
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if (ret == -2) {
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fprintf(stderr,
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"plink: option \"%s\" requires an argument\n", p);
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errors = true;
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} else if (ret == 2) {
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--argc, ++argv;
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} else if (ret == 1) {
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continue;
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} else if (!strcmp(p, "-batch")) {
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console_batch_mode = true;
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} else if (!strcmp(p, "-s")) {
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/* Save status to write to conf later. */
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use_subsystem = true;
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} else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
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version();
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} else if (!strcmp(p, "--help")) {
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usage();
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} else if (!strcmp(p, "-pgpfp")) {
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pgp_fingerprints();
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exit(1);
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} else if (!strcmp(p, "-shareexists")) {
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just_test_share_exists = true;
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} else if (!strcmp(p, "-sanitise-stdout") ||
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!strcmp(p, "-sanitize-stdout")) {
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sanitise_stdout = FORCE_ON;
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} else if (!strcmp(p, "-no-sanitise-stdout") ||
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!strcmp(p, "-no-sanitize-stdout")) {
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sanitise_stdout = FORCE_OFF;
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} else if (!strcmp(p, "-sanitise-stderr") ||
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!strcmp(p, "-sanitize-stderr")) {
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sanitise_stderr = FORCE_ON;
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} else if (!strcmp(p, "-no-sanitise-stderr") ||
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!strcmp(p, "-no-sanitize-stderr")) {
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sanitise_stderr = FORCE_OFF;
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} else if (!strcmp(p, "-no-antispoof")) {
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console_antispoof_prompt = false;
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} else if (*p != '-') {
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strbuf *cmdbuf = strbuf_new();
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while (argc > 0) {
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if (cmdbuf->len > 0)
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put_byte(cmdbuf, ' '); /* add space separator */
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put_dataz(cmdbuf, p);
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if (--argc > 0)
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p = *++argv;
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}
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conf_set_str(conf, CONF_remote_cmd, cmdbuf->s);
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conf_set_str(conf, CONF_remote_cmd2, "");
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conf_set_bool(conf, CONF_nopty, true); /* command => no tty */
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strbuf_free(cmdbuf);
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break; /* done with cmdline */
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} else {
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fprintf(stderr, "plink: unknown option \"%s\"\n", p);
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errors = true;
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}
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}
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if (errors)
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return 1;
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if (!cmdline_host_ok(conf)) {
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usage();
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}
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prepare_session(conf);
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/*
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* Perform command-line overrides on session configuration.
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*/
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cmdline_run_saved(conf);
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/*
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* Apply subsystem status.
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*/
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if (use_subsystem)
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conf_set_bool(conf, CONF_ssh_subsys, true);
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/*
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* Select protocol. This is farmed out into a table in a
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* separate file to enable an ssh-free variant.
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*/
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vt = backend_vt_from_proto(conf_get_int(conf, CONF_protocol));
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if (vt == NULL) {
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fprintf(stderr,
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"Internal fault: Unsupported protocol found\n");
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return 1;
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}
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if (vt->flags & BACKEND_NEEDS_TERMINAL) {
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fprintf(stderr,
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"Plink doesn't support %s, which needs terminal emulation\n",
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vt->displayname_lc);
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return 1;
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}
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sk_init();
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if (p_WSAEventSelect == NULL) {
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fprintf(stderr, "Plink requires WinSock 2\n");
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return 1;
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}
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/*
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* Plink doesn't provide any way to add forwardings after the
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* connection is set up, so if there are none now, we can safely set
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* the "simple" flag.
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*/
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if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
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!conf_get_bool(conf, CONF_x11_forward) &&
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!conf_get_bool(conf, CONF_agentfwd) &&
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!conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
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conf_set_bool(conf, CONF_ssh_simple, true);
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|
|
logctx = log_init(console_cli_logpolicy, conf);
|
|
|
|
if (just_test_share_exists) {
|
|
if (!vt->test_for_upstream) {
|
|
fprintf(stderr, "Connection sharing not supported for this "
|
|
"connection type (%s)'\n", vt->displayname_lc);
|
|
return 1;
|
|
}
|
|
if (vt->test_for_upstream(conf_get_str(conf, CONF_host),
|
|
conf_get_int(conf, CONF_port), conf))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
if (restricted_acl()) {
|
|
lp_eventlog(console_cli_logpolicy,
|
|
"Running with restricted process ACL");
|
|
}
|
|
|
|
inhandle = GetStdHandle(STD_INPUT_HANDLE);
|
|
outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
|
|
errhandle = GetStdHandle(STD_ERROR_HANDLE);
|
|
|
|
/*
|
|
* Turn off ECHO and LINE input modes. We don't care if this
|
|
* call fails, because we know we aren't necessarily running in
|
|
* a console.
|
|
*/
|
|
GetConsoleMode(inhandle, &orig_console_mode);
|
|
SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
|
|
|
|
/*
|
|
* Pass the output handles to the handle-handling subsystem.
|
|
* (The input one we leave until we're through the
|
|
* authentication process.)
|
|
*/
|
|
stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
|
|
stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);
|
|
handle_sink_init(&stdout_hs, stdout_handle);
|
|
handle_sink_init(&stderr_hs, stderr_handle);
|
|
stdout_bs = BinarySink_UPCAST(&stdout_hs);
|
|
stderr_bs = BinarySink_UPCAST(&stderr_hs);
|
|
|
|
/*
|
|
* Decide whether to sanitise control sequences out of standard
|
|
* output and standard error.
|
|
*
|
|
* If we weren't given a command-line override, we do this if (a)
|
|
* the fd in question is pointing at a console, and (b) we aren't
|
|
* trying to allocate a terminal as part of the session.
|
|
*
|
|
* (Rationale: the risk of control sequences is that they cause
|
|
* confusion when sent to a local console, so if there isn't one,
|
|
* no problem. Also, if we allocate a remote terminal, then we
|
|
* sent a terminal type, i.e. we told it what kind of escape
|
|
* sequences we _like_, i.e. we were expecting to receive some.)
|
|
*/
|
|
if (sanitise_stdout == FORCE_ON ||
|
|
(sanitise_stdout == AUTO && is_console_handle(outhandle) &&
|
|
conf_get_bool(conf, CONF_nopty))) {
|
|
stdout_scc = stripctrl_new(stdout_bs, true, L'\0');
|
|
stdout_bs = BinarySink_UPCAST(stdout_scc);
|
|
}
|
|
if (sanitise_stderr == FORCE_ON ||
|
|
(sanitise_stderr == AUTO && is_console_handle(errhandle) &&
|
|
conf_get_bool(conf, CONF_nopty))) {
|
|
stderr_scc = stripctrl_new(stderr_bs, true, L'\0');
|
|
stderr_bs = BinarySink_UPCAST(stderr_scc);
|
|
}
|
|
|
|
/*
|
|
* Start up the connection.
|
|
*/
|
|
winselcli_setup(); /* ensure event object exists */
|
|
{
|
|
char *error, *realhost;
|
|
/* nodelay is only useful if stdin is a character device (console) */
|
|
bool nodelay = conf_get_bool(conf, CONF_tcp_nodelay) &&
|
|
(GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
|
|
|
|
error = backend_init(vt, plink_seat, &backend, logctx, conf,
|
|
conf_get_str(conf, CONF_host),
|
|
conf_get_int(conf, CONF_port),
|
|
&realhost, nodelay,
|
|
conf_get_bool(conf, CONF_tcp_keepalives));
|
|
if (error) {
|
|
fprintf(stderr, "Unable to open connection:\n%s", error);
|
|
sfree(error);
|
|
return 1;
|
|
}
|
|
ldisc_create(conf, NULL, backend, plink_seat);
|
|
sfree(realhost);
|
|
}
|
|
|
|
main_thread_id = GetCurrentThreadId();
|
|
|
|
sending = false;
|
|
|
|
cli_main_loop(plink_mainloop_pre, plink_mainloop_post, NULL);
|
|
|
|
exitcode = backend_exitcode(backend);
|
|
if (exitcode < 0) {
|
|
fprintf(stderr, "Remote process exit code unavailable\n");
|
|
exitcode = 1; /* this is an error condition */
|
|
}
|
|
cleanup_exit(exitcode);
|
|
return 0; /* placate compiler warning */
|
|
}
|