mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-08 08:58:00 +00:00
65270b56f0
In a GUI app, when interactive userpass input begins, the Ldisc acquires a reference to a prompts_t. If something bad happens to the SSH connection (e.g. unexpected server-side closure), then all the SSH layers will be destroyed, including freeing that prompts_t. So the Ldisc will have a stale reference to it, which it might potentially use. To fix that, I've arranged a back-pointer so that prompts_t itself can find the Ldisc's reference to it, and NULL it out on free. So now, whichever of a prompts_t and an Ldisc is freed first, the link between them should be cleanly broken. (I'm not 100% sure this is absolutely necessary, in the sense of whether a sequence of events can _actually_ happen that causes a stale pointer dereference. But I don't want to take the chance!)
579 lines
21 KiB
C
579 lines
21 KiB
C
/*
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* ldisc.c: PuTTY line discipline. Sits between the input coming
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* from keypresses in the window, and the output channel leading to
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* the back end. Implements echo and/or local line editing,
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* depending on what's currently configured.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <assert.h>
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#include "putty.h"
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#include "terminal.h"
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struct Ldisc_tag {
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Terminal *term;
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Backend *backend;
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Seat *seat;
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/*
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* When the backend is not reporting true from sendok(), terminal
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* input that comes here is stored in this bufchain instead. When
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* the backend later decides it wants session input, we empty the
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* queue in ldisc_check_sendok_callback(), passing its contents on
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* to the backend. Before then, we also provide data from this
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* queue to term_get_userpass_input() via ldisc_get_input_token(),
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* to be interpreted as user responses to username and password
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* prompts during authentication.
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*
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* Unfortunately, the data stored in this queue is not all of the
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* same type: our output to the backend consists of both raw bytes
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* sent to backend_send(), and also session specials such as
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* SS_EOL and SS_EC. So we have to encode our queued data in a way
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* that can represent both.
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*
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* The encoding is private to this source file, so we can change
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* it if necessary and only have to worry about the encode and
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* decode functions here. Currently, it is:
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*
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* - Bytes other than 0xFF are stored literally.
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* - The byte 0xFF itself is stored as 0xFF 0xFF.
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* - A session special (code, arg) is stored as 0xFF, followed by
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* a big-endian 4-byte integer containing code, followed by
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* another big-endian 4-byte integer containing arg.
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*
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* (This representation relies on session special codes being at
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* most 0xFEFFFFFF when represented in 32 bits, so that the first
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* byte of the 'code' integer can't be confused with the 0xFF
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* followup byte indicating a literal 0xFF, But since session
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* special codes are defined by an enum counting up from zero, and
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* there are only a couple of dozen of them, that shouldn't be a
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* problem! Even so, just in case, an assertion checks that at
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* encode time.)
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*/
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bufchain input_queue;
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IdempotentCallback input_queue_callback;
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prompts_t *prompts;
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/*
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* Values cached out of conf.
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*/
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bool telnet_keyboard, telnet_newline;
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int protocol, localecho, localedit;
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char *buf;
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size_t buflen, bufsiz;
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bool quotenext;
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};
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#define ECHOING (ldisc->localecho == FORCE_ON || \
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(ldisc->localecho == AUTO && \
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(backend_ldisc_option_state(ldisc->backend, LD_ECHO))))
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#define EDITING (ldisc->localedit == FORCE_ON || \
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(ldisc->localedit == AUTO && \
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(backend_ldisc_option_state(ldisc->backend, LD_EDIT))))
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static void c_write(Ldisc *ldisc, const void *buf, int len)
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{
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seat_stdout(ldisc->seat, buf, len);
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}
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static int plen(Ldisc *ldisc, unsigned char c)
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{
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if ((c >= 32 && c <= 126) || (c >= 160 && !in_utf(ldisc->term)))
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return 1;
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else if (c < 128)
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return 2; /* ^x for some x */
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else if (in_utf(ldisc->term) && c >= 0xC0)
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return 1; /* UTF-8 introducer character
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* (FIXME: combining / wide chars) */
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else if (in_utf(ldisc->term) && c >= 0x80 && c < 0xC0)
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return 0; /* UTF-8 followup character */
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else
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return 4; /* <XY> hex representation */
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}
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static void pwrite(Ldisc *ldisc, unsigned char c)
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{
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if ((c >= 32 && c <= 126) ||
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(!in_utf(ldisc->term) && c >= 0xA0) ||
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(in_utf(ldisc->term) && c >= 0x80)) {
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c_write(ldisc, &c, 1);
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} else if (c < 128) {
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char cc[2];
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cc[1] = (c == 127 ? '?' : c + 0x40);
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cc[0] = '^';
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c_write(ldisc, cc, 2);
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} else {
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char cc[5];
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sprintf(cc, "<%02X>", c);
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c_write(ldisc, cc, 4);
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}
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}
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static bool char_start(Ldisc *ldisc, unsigned char c)
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{
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if (in_utf(ldisc->term))
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return (c < 0x80 || c >= 0xC0);
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else
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return true;
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}
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static void bsb(Ldisc *ldisc, int n)
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{
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while (n--)
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c_write(ldisc, "\010 \010", 3);
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}
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static void ldisc_input_queue_callback(void *ctx);
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#define CTRL(x) (x^'@')
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#define KCTRL(x) ((x^'@') | 0x100)
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Ldisc *ldisc_create(Conf *conf, Terminal *term, Backend *backend, Seat *seat)
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{
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Ldisc *ldisc = snew(Ldisc);
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ldisc->buf = NULL;
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ldisc->buflen = 0;
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ldisc->bufsiz = 0;
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ldisc->quotenext = false;
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ldisc->backend = backend;
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ldisc->term = term;
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ldisc->seat = seat;
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bufchain_init(&ldisc->input_queue);
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ldisc->prompts = NULL;
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ldisc->input_queue_callback.fn = ldisc_input_queue_callback;
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ldisc->input_queue_callback.ctx = ldisc;
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ldisc->input_queue_callback.queued = false;
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bufchain_set_callback(&ldisc->input_queue, &ldisc->input_queue_callback);
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ldisc_configure(ldisc, conf);
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/* Link ourselves into the backend and the terminal */
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if (term)
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term->ldisc = ldisc;
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if (backend)
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backend_provide_ldisc(backend, ldisc);
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return ldisc;
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}
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void ldisc_configure(Ldisc *ldisc, Conf *conf)
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{
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ldisc->telnet_keyboard = conf_get_bool(conf, CONF_telnet_keyboard);
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ldisc->telnet_newline = conf_get_bool(conf, CONF_telnet_newline);
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ldisc->protocol = conf_get_int(conf, CONF_protocol);
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ldisc->localecho = conf_get_int(conf, CONF_localecho);
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ldisc->localedit = conf_get_int(conf, CONF_localedit);
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}
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void ldisc_free(Ldisc *ldisc)
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{
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bufchain_clear(&ldisc->input_queue);
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if (ldisc->term)
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ldisc->term->ldisc = NULL;
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if (ldisc->backend)
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backend_provide_ldisc(ldisc->backend, NULL);
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if (ldisc->buf)
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sfree(ldisc->buf);
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if (ldisc->prompts && ldisc->prompts->ldisc_ptr_to_us == &ldisc->prompts)
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ldisc->prompts->ldisc_ptr_to_us = NULL;
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delete_callbacks_for_context(ldisc);
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sfree(ldisc);
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}
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void ldisc_echoedit_update(Ldisc *ldisc)
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{
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seat_echoedit_update(ldisc->seat, ECHOING, EDITING);
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}
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void ldisc_enable_prompt_callback(Ldisc *ldisc, prompts_t *prompts)
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{
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/*
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* Called by the terminal to indicate that there's a prompts_t
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* currently in flight, or to indicate that one has just finished
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* (by passing NULL). When ldisc->prompts is not null, we notify
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* the terminal whenever new data arrives in our input queue, so
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* that it can continue the interactive prompting process.
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*/
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ldisc->prompts = prompts;
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if (prompts)
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ldisc->prompts->ldisc_ptr_to_us = &ldisc->prompts;
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}
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static void ldisc_input_queue_callback(void *ctx)
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{
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/*
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* Toplevel callback that is triggered whenever the input queue
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* lengthens. If we're currently processing an interactive prompt,
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* we call back the Terminal to tell it to do some more stuff with
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* that prompt based on the new input.
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*/
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Ldisc *ldisc = (Ldisc *)ctx;
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if (ldisc->term && ldisc->prompts) {
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/*
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* The integer return value from this call is discarded,
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* because we have no channel to pass it on to the backend
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* that originally wanted it. But that's OK, because if the
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* return value is >= 0 (that is, the prompts are either
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* completely filled in, or aborted by the user), then the
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* terminal will notify the callback in the prompts_t, and
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* when that calls term_get_userpass_input again, it will
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* return the same answer again.
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*/
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term_get_userpass_input(ldisc->term, ldisc->prompts);
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}
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}
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static void ldisc_to_backend_raw(
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Ldisc *ldisc, const void *vbuf, size_t len)
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{
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if (backend_sendok(ldisc->backend)) {
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backend_send(ldisc->backend, vbuf, len);
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} else {
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const char *buf = (const char *)vbuf;
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while (len > 0) {
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/*
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* Encode raw data in input_queue, by storing large chunks
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* as long as they don't include 0xFF, and pausing every
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* time they do to escape it.
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*/
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const char *ff = memchr(buf, '\xFF', len);
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size_t this_len = ff ? ff - buf : len;
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if (this_len > 0) {
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bufchain_add(&ldisc->input_queue, buf, len);
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} else {
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bufchain_add(&ldisc->input_queue, "\xFF\xFF", 2);
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this_len = 1;
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}
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buf += this_len;
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len -= this_len;
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}
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}
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}
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static void ldisc_to_backend_special(
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Ldisc *ldisc, SessionSpecialCode code, int arg)
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{
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if (backend_sendok(ldisc->backend)) {
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backend_special(ldisc->backend, code, arg);
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} else {
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/*
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* Encode a session special in input_queue.
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*/
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unsigned char data[9];
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data[0] = 0xFF;
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PUT_32BIT_MSB_FIRST(data+1, code);
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PUT_32BIT_MSB_FIRST(data+5, arg);
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assert(data[1] != 0xFF &&
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"SessionSpecialCode encoding collides with FF FF escape");
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bufchain_add(&ldisc->input_queue, data, 9);
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}
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}
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bool ldisc_has_input_buffered(Ldisc *ldisc)
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{
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return bufchain_size(&ldisc->input_queue) > 0;
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}
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LdiscInputToken ldisc_get_input_token(Ldisc *ldisc)
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{
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assert(bufchain_size(&ldisc->input_queue) > 0 &&
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"You're not supposed to call this unless there is buffered input!");
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LdiscInputToken tok;
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char c;
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bufchain_fetch_consume(&ldisc->input_queue, &c, 1);
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if (c != '\xFF') {
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/* A literal non-FF byte */
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tok.is_special = false;
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tok.chr = c;
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return tok;
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} else {
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char data[8];
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/* See if the byte after the FF is also FF, indicating a literal FF */
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bufchain_fetch_consume(&ldisc->input_queue, data, 1);
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if (data[0] == '\xFF') {
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tok.is_special = false;
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tok.chr = '\xFF';
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return tok;
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}
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/* If not, get the rest of an 8-byte chunk and decode a special */
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bufchain_fetch_consume(&ldisc->input_queue, data+1, 7);
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tok.is_special = true;
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tok.code = GET_32BIT_MSB_FIRST(data);
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tok.arg = toint(GET_32BIT_MSB_FIRST(data+4));
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return tok;
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}
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}
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static void ldisc_check_sendok_callback(void *ctx)
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{
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Ldisc *ldisc = (Ldisc *)ctx;
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if (!(ldisc->backend && backend_sendok(ldisc->backend)))
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return;
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/*
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* Flush the ldisc input queue into the backend, which is now
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* willing to receive the data.
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*/
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while (bufchain_size(&ldisc->input_queue) > 0) {
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/*
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* Process either a chunk of non-special data, or an FF
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* escape, depending on whether the first thing we see is an
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* FF byte.
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*/
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ptrlen data = bufchain_prefix(&ldisc->input_queue);
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const char *ff = memchr(data.ptr, '\xFF', data.len);
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if (ff != data.ptr) {
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/* Send a maximal block of data not containing any
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* difficult bytes. */
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if (ff)
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data.len = ff - (const char *)data.ptr;
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backend_send(ldisc->backend, data.ptr, data.len);
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bufchain_consume(&ldisc->input_queue, data.len);
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} else {
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/* Decode either a special or an escaped FF byte. The
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* easiest way to do this is to reuse the decoding code
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* already in ldisc_get_input_token. */
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LdiscInputToken tok = ldisc_get_input_token(ldisc);
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if (tok.is_special)
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backend_special(ldisc->backend, tok.code, tok.arg);
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else
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backend_send(ldisc->backend, &tok.chr, 1);
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}
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}
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}
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void ldisc_check_sendok(Ldisc *ldisc)
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{
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queue_toplevel_callback(ldisc_check_sendok_callback, ldisc);
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}
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void ldisc_send(Ldisc *ldisc, const void *vbuf, int len, bool interactive)
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{
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const char *buf = (const char *)vbuf;
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int keyflag = 0;
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assert(ldisc->term);
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if (interactive) {
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/*
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* Interrupt a paste from the clipboard, if one was in
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* progress when the user pressed a key. This is easier than
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* buffering the current piece of data and saving it until the
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* terminal has finished pasting, and has the potential side
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* benefit of permitting a user to cancel an accidental huge
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* paste.
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*/
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term_nopaste(ldisc->term);
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}
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/*
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* Less than zero means null terminated special string.
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*/
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if (len < 0) {
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len = strlen(buf);
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keyflag = KCTRL('@');
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}
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/*
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* Either perform local editing, or just send characters.
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*/
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if (EDITING) {
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while (len--) {
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int c;
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c = (unsigned char)(*buf++) + keyflag;
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if (!interactive && c == '\r')
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c += KCTRL('@');
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switch (ldisc->quotenext ? ' ' : c) {
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/*
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* ^h/^?: delete, and output BSBs, to return to
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* last character boundary (in UTF-8 mode this may
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* be more than one byte)
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* ^w: delete, and output BSBs, to return to last
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* space/nonspace boundary
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* ^u: delete, and output BSBs, to return to BOL
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* ^c: Do a ^u then send a telnet IP
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* ^z: Do a ^u then send a telnet SUSP
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* ^\: Do a ^u then send a telnet ABORT
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* ^r: echo "^R\n" and redraw line
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* ^v: quote next char
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* ^d: if at BOL, end of file and close connection,
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* else send line and reset to BOL
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* ^m: send line-plus-\r\n and reset to BOL
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*/
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case KCTRL('H'):
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case KCTRL('?'): /* backspace/delete */
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if (ldisc->buflen > 0) {
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do {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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} while (!char_start(ldisc, ldisc->buf[ldisc->buflen]));
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}
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break;
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case CTRL('W'): /* delete word */
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while (ldisc->buflen > 0) {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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if (ldisc->buflen > 0 &&
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isspace((unsigned char)ldisc->buf[ldisc->buflen-1]) &&
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!isspace((unsigned char)ldisc->buf[ldisc->buflen]))
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break;
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}
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break;
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case CTRL('U'): /* delete line */
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case CTRL('C'): /* Send IP */
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case CTRL('\\'): /* Quit */
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case CTRL('Z'): /* Suspend */
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while (ldisc->buflen > 0) {
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if (ECHOING)
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bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
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ldisc->buflen--;
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}
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ldisc_to_backend_special(ldisc, SS_EL, 0);
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/*
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* We don't send IP, SUSP or ABORT if the user has
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* configured telnet specials off! This breaks
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* talkers otherwise.
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*/
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if (!ldisc->telnet_keyboard)
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goto default_case;
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if (c == CTRL('C'))
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ldisc_to_backend_special(ldisc, SS_IP, 0);
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if (c == CTRL('Z'))
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ldisc_to_backend_special(ldisc, SS_SUSP, 0);
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if (c == CTRL('\\'))
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ldisc_to_backend_special(ldisc, SS_ABORT, 0);
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break;
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case CTRL('R'): /* redraw line */
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if (ECHOING) {
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int i;
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c_write(ldisc, "^R\r\n", 4);
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for (i = 0; i < ldisc->buflen; i++)
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pwrite(ldisc, ldisc->buf[i]);
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}
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break;
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case CTRL('V'): /* quote next char */
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ldisc->quotenext = true;
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break;
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case CTRL('D'): /* logout or send */
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if (ldisc->buflen == 0) {
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ldisc_to_backend_special(ldisc, SS_EOF, 0);
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} else {
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ldisc_to_backend_raw(ldisc, ldisc->buf, ldisc->buflen);
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ldisc->buflen = 0;
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}
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break;
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/*
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* This particularly hideous bit of code from RDB
|
|
* allows ordinary ^M^J to do the same thing as
|
|
* magic-^M when in Raw protocol. The line `case
|
|
* KCTRL('M'):' is _inside_ the if block. Thus:
|
|
*
|
|
* - receiving regular ^M goes straight to the
|
|
* default clause and inserts as a literal ^M.
|
|
* - receiving regular ^J _not_ directly after a
|
|
* literal ^M (or not in Raw protocol) fails the
|
|
* if condition, leaps to the bottom of the if,
|
|
* and falls through into the default clause
|
|
* again.
|
|
* - receiving regular ^J just after a literal ^M
|
|
* in Raw protocol passes the if condition,
|
|
* deletes the literal ^M, and falls through
|
|
* into the magic-^M code
|
|
* - receiving a magic-^M empties the line buffer,
|
|
* signals end-of-line in one of the various
|
|
* entertaining ways, and _doesn't_ fall out of
|
|
* the bottom of the if and through to the
|
|
* default clause because of the break.
|
|
*/
|
|
case CTRL('J'):
|
|
if (ldisc->protocol == PROT_RAW &&
|
|
ldisc->buflen > 0 && ldisc->buf[ldisc->buflen - 1] == '\r') {
|
|
if (ECHOING)
|
|
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
|
|
ldisc->buflen--;
|
|
/* FALLTHROUGH */
|
|
case KCTRL('M'): /* send with newline */
|
|
if (ldisc->buflen > 0)
|
|
ldisc_to_backend_raw(ldisc, ldisc->buf, ldisc->buflen);
|
|
if (ldisc->protocol == PROT_RAW)
|
|
ldisc_to_backend_raw(ldisc, "\r\n", 2);
|
|
else if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
|
|
ldisc_to_backend_special(ldisc, SS_EOL, 0);
|
|
else
|
|
ldisc_to_backend_raw(ldisc, "\r", 1);
|
|
if (ECHOING)
|
|
c_write(ldisc, "\r\n", 2);
|
|
ldisc->buflen = 0;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default: /* get to this label from ^V handler */
|
|
default_case:
|
|
sgrowarray(ldisc->buf, ldisc->bufsiz, ldisc->buflen);
|
|
ldisc->buf[ldisc->buflen++] = c;
|
|
if (ECHOING)
|
|
pwrite(ldisc, (unsigned char) c);
|
|
ldisc->quotenext = false;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
if (ldisc->buflen != 0) {
|
|
ldisc_to_backend_raw(ldisc, ldisc->buf, ldisc->buflen);
|
|
while (ldisc->buflen > 0) {
|
|
bsb(ldisc, plen(ldisc, ldisc->buf[ldisc->buflen - 1]));
|
|
ldisc->buflen--;
|
|
}
|
|
}
|
|
if (len > 0) {
|
|
if (ECHOING)
|
|
c_write(ldisc, buf, len);
|
|
if (keyflag && ldisc->protocol == PROT_TELNET && len == 1) {
|
|
switch (buf[0]) {
|
|
case CTRL('M'):
|
|
if (ldisc->protocol == PROT_TELNET && ldisc->telnet_newline)
|
|
ldisc_to_backend_special(ldisc, SS_EOL, 0);
|
|
else
|
|
ldisc_to_backend_raw(ldisc, "\r", 1);
|
|
break;
|
|
case CTRL('?'):
|
|
case CTRL('H'):
|
|
if (ldisc->telnet_keyboard) {
|
|
ldisc_to_backend_special(ldisc, SS_EC, 0);
|
|
break;
|
|
}
|
|
case CTRL('C'):
|
|
if (ldisc->telnet_keyboard) {
|
|
ldisc_to_backend_special(ldisc, SS_IP, 0);
|
|
break;
|
|
}
|
|
case CTRL('Z'):
|
|
if (ldisc->telnet_keyboard) {
|
|
ldisc_to_backend_special(ldisc, SS_SUSP, 0);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ldisc_to_backend_raw(ldisc, buf, len);
|
|
break;
|
|
}
|
|
} else
|
|
ldisc_to_backend_raw(ldisc, buf, len);
|
|
}
|
|
}
|
|
}
|