зеркало из https://github.com/github/putty.git
342 строки
8.5 KiB
C
342 строки
8.5 KiB
C
/*
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* uxcons.c: various interactive-prompt routines shared between the
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* Unix console PuTTY tools
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <termios.h>
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#include <unistd.h>
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#include "putty.h"
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#include "storage.h"
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#include "ssh.h"
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int console_batch_mode = FALSE;
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static void *console_logctx = NULL;
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/*
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* Clean up and exit.
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*/
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void cleanup_exit(int code)
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{
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/*
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* Clean up.
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*/
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sk_cleanup();
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random_save_seed();
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exit(code);
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}
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void set_busy_status(void *frontend, int status)
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{
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}
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void update_specials_menu(void *frontend)
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{
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}
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void notify_remote_exit(void *frontend)
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{
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}
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void timer_change_notify(long next)
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{
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}
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int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
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char *keystr, char *fingerprint,
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void (*callback)(void *ctx, int result), void *ctx)
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{
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int ret;
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static const char absentmsg_batch[] =
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"The server's host key is not cached. You have no guarantee\n"
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"that the server is the computer you think it is.\n"
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"The server's %s key fingerprint is:\n"
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"%s\n"
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"Connection abandoned.\n";
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static const char absentmsg[] =
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"The server's host key is not cached. You have no guarantee\n"
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"that the server is the computer you think it is.\n"
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"The server's %s key fingerprint is:\n"
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"%s\n"
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"If you trust this host, enter \"y\" to add the key to\n"
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"PuTTY's cache and carry on connecting.\n"
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"If you want to carry on connecting just once, without\n"
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"adding the key to the cache, enter \"n\".\n"
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"If you do not trust this host, press Return to abandon the\n"
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"connection.\n"
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"Store key in cache? (y/n) ";
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static const char wrongmsg_batch[] =
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"WARNING - POTENTIAL SECURITY BREACH!\n"
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"The server's host key does not match the one PuTTY has\n"
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"cached. This means that either the server administrator\n"
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"has changed the host key, or you have actually connected\n"
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"to another computer pretending to be the server.\n"
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"The new %s key fingerprint is:\n"
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"%s\n"
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"Connection abandoned.\n";
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static const char wrongmsg[] =
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"WARNING - POTENTIAL SECURITY BREACH!\n"
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"The server's host key does not match the one PuTTY has\n"
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"cached. This means that either the server administrator\n"
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"has changed the host key, or you have actually connected\n"
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"to another computer pretending to be the server.\n"
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"The new %s key fingerprint is:\n"
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"%s\n"
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"If you were expecting this change and trust the new key,\n"
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"enter \"y\" to update PuTTY's cache and continue connecting.\n"
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"If you want to carry on connecting but without updating\n"
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"the cache, enter \"n\".\n"
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"If you want to abandon the connection completely, press\n"
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"Return to cancel. Pressing Return is the ONLY guaranteed\n"
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"safe choice.\n"
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"Update cached key? (y/n, Return cancels connection) ";
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static const char abandoned[] = "Connection abandoned.\n";
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char line[32];
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/*
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* Verify the key.
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*/
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ret = verify_host_key(host, port, keytype, keystr);
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if (ret == 0) /* success - key matched OK */
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return 1;
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if (ret == 2) { /* key was different */
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if (console_batch_mode) {
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fprintf(stderr, wrongmsg_batch, keytype, fingerprint);
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return 0;
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}
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fprintf(stderr, wrongmsg, keytype, fingerprint);
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fflush(stderr);
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}
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if (ret == 1) { /* key was absent */
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if (console_batch_mode) {
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fprintf(stderr, absentmsg_batch, keytype, fingerprint);
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return 0;
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}
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fprintf(stderr, absentmsg, keytype, fingerprint);
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fflush(stderr);
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}
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{
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struct termios oldmode, newmode;
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tcgetattr(0, &oldmode);
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newmode = oldmode;
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newmode.c_lflag |= ECHO | ISIG | ICANON;
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tcsetattr(0, TCSANOW, &newmode);
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line[0] = '\0';
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read(0, line, sizeof(line) - 1);
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tcsetattr(0, TCSANOW, &oldmode);
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}
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if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') {
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if (line[0] == 'y' || line[0] == 'Y')
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store_host_key(host, port, keytype, keystr);
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return 1;
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} else {
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fprintf(stderr, abandoned);
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return 0;
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}
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}
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/*
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* Ask whether the selected algorithm is acceptable (since it was
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* below the configured 'warn' threshold).
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*/
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int askalg(void *frontend, const char *algtype, const char *algname,
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void (*callback)(void *ctx, int result), void *ctx)
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{
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static const char msg[] =
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"The first %s supported by the server is\n"
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"%s, which is below the configured warning threshold.\n"
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"Continue with connection? (y/n) ";
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static const char msg_batch[] =
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"The first %s supported by the server is\n"
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"%s, which is below the configured warning threshold.\n"
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"Connection abandoned.\n";
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static const char abandoned[] = "Connection abandoned.\n";
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char line[32];
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if (console_batch_mode) {
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fprintf(stderr, msg_batch, algtype, algname);
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return 0;
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}
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fprintf(stderr, msg, algtype, algname);
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fflush(stderr);
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{
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struct termios oldmode, newmode;
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tcgetattr(0, &oldmode);
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newmode = oldmode;
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newmode.c_lflag |= ECHO | ISIG | ICANON;
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tcsetattr(0, TCSANOW, &newmode);
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line[0] = '\0';
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read(0, line, sizeof(line) - 1);
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tcsetattr(0, TCSANOW, &oldmode);
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}
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if (line[0] == 'y' || line[0] == 'Y') {
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return 1;
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} else {
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fprintf(stderr, abandoned);
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return 0;
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}
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}
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/*
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* Ask whether to wipe a session log file before writing to it.
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* Returns 2 for wipe, 1 for append, 0 for cancel (don't log).
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*/
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int askappend(void *frontend, Filename filename,
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void (*callback)(void *ctx, int result), void *ctx)
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{
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static const char msgtemplate[] =
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"The session log file \"%.*s\" already exists.\n"
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"You can overwrite it with a new session log,\n"
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"append your session log to the end of it,\n"
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"or disable session logging for this session.\n"
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"Enter \"y\" to wipe the file, \"n\" to append to it,\n"
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"or just press Return to disable logging.\n"
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"Wipe the log file? (y/n, Return cancels logging) ";
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static const char msgtemplate_batch[] =
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"The session log file \"%.*s\" already exists.\n"
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"Logging will not be enabled.\n";
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char line[32];
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if (console_batch_mode) {
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fprintf(stderr, msgtemplate_batch, FILENAME_MAX, filename.path);
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fflush(stderr);
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return 0;
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}
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fprintf(stderr, msgtemplate, FILENAME_MAX, filename.path);
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fflush(stderr);
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{
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struct termios oldmode, newmode;
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tcgetattr(0, &oldmode);
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newmode = oldmode;
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newmode.c_lflag |= ECHO | ISIG | ICANON;
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tcsetattr(0, TCSANOW, &newmode);
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line[0] = '\0';
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read(0, line, sizeof(line) - 1);
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tcsetattr(0, TCSANOW, &oldmode);
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}
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if (line[0] == 'y' || line[0] == 'Y')
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return 2;
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else if (line[0] == 'n' || line[0] == 'N')
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return 1;
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else
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return 0;
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}
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/*
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* Warn about the obsolescent key file format.
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*
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* Uniquely among these functions, this one does _not_ expect a
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* frontend handle. This means that if PuTTY is ported to a
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* platform which requires frontend handles, this function will be
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* an anomaly. Fortunately, the problem it addresses will not have
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* been present on that platform, so it can plausibly be
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* implemented as an empty function.
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*/
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void old_keyfile_warning(void)
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{
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static const char message[] =
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"You are loading an SSH-2 private key which has an\n"
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"old version of the file format. This means your key\n"
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"file is not fully tamperproof. Future versions of\n"
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"PuTTY may stop supporting this private key format,\n"
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"so we recommend you convert your key to the new\n"
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"format.\n"
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"\n"
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"Once the key is loaded into PuTTYgen, you can perform\n"
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"this conversion simply by saving it again.\n";
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fputs(message, stderr);
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}
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void console_provide_logctx(void *logctx)
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{
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console_logctx = logctx;
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}
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void logevent(void *frontend, const char *string)
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{
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if (console_logctx)
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log_eventlog(console_logctx, string);
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}
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int console_get_line(const char *prompt, char *str,
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int maxlen, int is_pw)
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{
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struct termios oldmode, newmode;
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int i;
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if (console_batch_mode) {
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if (maxlen > 0)
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str[0] = '\0';
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return 0;
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} else {
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tcgetattr(0, &oldmode);
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newmode = oldmode;
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newmode.c_lflag |= ISIG | ICANON;
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if (is_pw)
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newmode.c_lflag &= ~ECHO;
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else
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newmode.c_lflag |= ECHO;
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tcsetattr(0, TCSANOW, &newmode);
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fputs(prompt, stdout);
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fflush(stdout);
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i = read(0, str, maxlen - 1);
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tcsetattr(0, TCSANOW, &oldmode);
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if (i > 0 && str[i-1] == '\n')
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i--;
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str[i] = '\0';
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if (is_pw)
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fputs("\n", stdout);
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return 1;
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}
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}
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void frontend_keypress(void *handle)
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{
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/*
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* This is nothing but a stub, in console code.
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*/
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return;
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}
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int is_interactive(void)
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{
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return isatty(0);
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}
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/*
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* X11-forwarding-related things suitable for console.
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*/
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const char platform_x11_best_transport[] = "unix";
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char *platform_get_x_display(void) {
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return dupstr(getenv("DISPLAY"));
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}
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