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pinentry-tty.c
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/* pinentry-curses.c - A secure curses dialog for PIN entry, library version
Copyright (C) 2014 Serge Voilokov
Copyright (C) 2015 Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Copyright (C) 2015 g10 Code GmbH
This file is part of PINENTRY.
PINENTRY is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PINENTRY is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <termios.h>
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif /*HAVE_UTIME_H*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include "pinentry.h"
#include "memory.h"
#ifndef HAVE_DOSISH_SYSTEM
static int timed_out;
#endif
static struct termios n_term;
static struct termios o_term;
static int
cbreak (int fd)
{
if ((tcgetattr(fd, &o_term)) == -1)
return -1;
n_term = o_term;
n_term.c_lflag = n_term.c_lflag & ~(ECHO|ICANON);
n_term.c_cc[VMIN] = 1;
n_term.c_cc[VTIME]= 0;
if ((tcsetattr(fd, TCSAFLUSH, &n_term)) == -1)
return -1;
return 1;
}
#define UNDERLINE_START "\033[4m"
/* Bold, red. */
#define ALERT_START "\033[1;31m"
#define NORMAL_RESTORE "\033[0m"
static char
button (char *text, char *default_text, FILE *ttyfo)
{
char *highlight;
if (! text)
return 0;
/* Skip any leading white space. */
while (*text == ' ')
text ++;
highlight = text;
while ((highlight = strchr (highlight, '_')))
{
highlight = highlight + 1;
if (*highlight == '_')
/* Escaped underscore. */
continue;
else
break;
}
if (! highlight)
/* Not accelerator. Take the first alpha-numeric character. */
{
highlight = text;
while (*highlight && !isalnum (*highlight))
highlight ++;
}
if (! highlight)
/* Hmm, no alpha-num characters. */
{
if (! default_text)
return 0;
text = highlight = default_text;
}
fputs (" ", ttyfo);
for (; *text; text ++)
{
/* Skip accelerator prefix. */
if (*text == '_')
continue;
if (text == highlight)
fputs (UNDERLINE_START, ttyfo);
fputc (*text, ttyfo);
if (text == highlight)
fputs (NORMAL_RESTORE, ttyfo);
}
fputc ('\n', ttyfo);
return *highlight;
}
static int
confirm (pinentry_t pinentry, FILE *ttyfi, FILE *ttyfo)
{
char *msg;
char ok = 0;
char notok = 0;
char cancel = 0;
int ret;
if (pinentry->error)
fprintf (ttyfo, "*** %s%s%s ***\n",
ALERT_START, pinentry->error, NORMAL_RESTORE);
msg = pinentry->description;
if (! msg)
/* If there is no description, fallback to the title. */
msg = pinentry->title;
if (! msg)
msg = "Confirm:";
if (msg)
{
fputs (msg, ttyfo);
fputc ('\n', ttyfo);
}
fflush (ttyfo);
if (pinentry->ok)
ok = button (pinentry->ok, "OK", ttyfo);
else if (pinentry->default_ok)
ok = button (pinentry->default_ok, "OK", ttyfo);
else
ok = button ("OK", NULL, ttyfo);
if (! pinentry->one_button)
{
if (pinentry->cancel)
cancel = button (pinentry->cancel, "Cancel", ttyfo);
else if (pinentry->default_cancel)
cancel = button (pinentry->default_cancel, "Cancel", ttyfo);
if (pinentry->notok)
notok = button (pinentry->notok, NULL, ttyfo);
}
if (cbreak (fileno (ttyfi)) == -1)
{
int err = errno;
fprintf (stderr, "cbreak failure, exiting\n");
errno = err;
return -1;
}
if (pinentry->one_button)
fprintf (ttyfo, "Press any key to continue.");
else
{
fputc ('[', ttyfo);
if (ok)
fputc (tolower (ok), ttyfo);
if (cancel)
fputc (tolower (cancel), ttyfo);
if (notok)
fputc (tolower (notok), ttyfo);
fputs("]? ", ttyfo);
}
while (1)
{
int input = fgetc (ttyfi);
if (input == EOF || input == 0x4)
/* End of file or control-d (= end of file). */
{
pinentry->close_button = 1;
pinentry->canceled = 1;
ret = 0;
break;
}
if (pinentry->one_button)
{
ret = 1;
break;
}
if (cancel && (input == toupper (cancel) || input == tolower (cancel)))
{
pinentry->canceled = 1;
ret = 0;
break;
}
else if (notok && (input == toupper (notok) || input == tolower (notok)))
{
ret = 0;
break;
}
else if (ok && (input == toupper (ok) || input == tolower (ok)))
{
ret = 1;
break;
}
}
fputc('\n', ttyfo);
tcsetattr (fileno(ttyfi), TCSANOW, &o_term);
return ret;
}
static char *
read_password (FILE *ttyfi, FILE *ttyfo)
{
int done = 0;
int len = 128;
int count = 0;
char *buffer;
if (cbreak (fileno (ttyfi)) == -1)
{
int err = errno;
fprintf (stderr, "cbreak failure, exiting\n");
errno = err;
return NULL;
}
buffer = secmem_malloc (len);
if (! buffer)
return NULL;
while (!done)
{
int c;
if (count == len - 1)
/* Double the buffer's size. Note: we check if count is len -
1 and not len so that we always have space for the NUL
character. */
{
char *tmp = secmem_realloc (buffer, 2 * len);
if (! tmp)
{
secmem_free (tmp);
return NULL;
}
buffer = tmp;
}
c = fgetc (ttyfi);
switch (c)
{
case 0x4: case EOF:
/* Control-d (i.e., end of file) or a real EOF. */
done = -1;
break;
case '\n':
done = 1;
break;
case 0x7f:
/* Backspace. */
if (count > 0)
count --;
break;
default:
buffer[count ++] = c;
break;
}
}
buffer[count] = '\0';
tcsetattr (fileno(ttyfi), TCSANOW, &o_term);
if (done == -1)
{
secmem_free (buffer);
return NULL;
}
return buffer;
}
static int
password (pinentry_t pinentry, FILE *ttyfi, FILE *ttyfo)
{
char *msg;
int done = 0;
msg = pinentry->description;
if (! msg)
msg = pinentry->title;
if (! msg)
msg = "Enter your passphrase.";
fprintf (ttyfo, "%s\n ", msg);
while (! done)
{
char *passphrase;
char *prompt = pinentry->prompt;
if (! prompt || !*prompt)
prompt = "PIN";
fprintf (ttyfo, "%s%s ",
prompt,
/* Make sure the prompt ends in a : or a question mark. */
(prompt[strlen(prompt) - 1] == ':'
|| prompt[strlen(prompt) - 1] == '?') ? "" : ":");
fflush (ttyfo);
passphrase = read_password (ttyfi, ttyfo);
fputc ('\n', ttyfo);
if (! passphrase)
{
done = -1;
break;
}
if (! pinentry->repeat_passphrase)
done = 1;
else
{
char *passphrase2;
prompt = pinentry->repeat_passphrase;
fprintf (ttyfo, "%s%s ",
prompt,
/* Make sure the prompt ends in a : or a question mark. */
(prompt[strlen(prompt) - 1] == ':'
|| prompt[strlen(prompt) - 1] == '?') ? "" : ":");
fflush (ttyfo);
passphrase2 = read_password (ttyfi, ttyfo);
fputc ('\n', ttyfo);
if (! passphrase2)
{
done = -1;
break;
}
if (strcmp (passphrase, passphrase2) == 0)
done = 1;
else
fprintf (ttyfo, "*** %s%s%s ***\n",
ALERT_START,
pinentry->repeat_error_string
?: "Passphrases don't match.",
NORMAL_RESTORE);
secmem_free (passphrase2);
}
if (done == 1)
pinentry_setbuffer_use (pinentry, passphrase, 0);
else
secmem_free (passphrase);
}
return done;
}
/* If a touch has been registered, touch that file. */
static void
do_touch_file(pinentry_t pinentry)
{
#ifdef HAVE_UTIME_H
struct stat st;
time_t tim;
if (!pinentry->touch_file || !*pinentry->touch_file)
return;
if (stat(pinentry->touch_file, &st))
return; /* Oops. */
/* Make sure that we actually update the mtime. */
while ((tim = time(NULL)) == st.st_mtime)
sleep(1);
/* Update but ignore errors as we can't do anything in that case.
Printing error messages may even clubber the display further. */
utime (pinentry->touch_file, NULL);
#endif /*HAVE_UTIME_H*/
}
#ifndef HAVE_DOSISH_SYSTEM
static void
catchsig(int sig)
{
if (sig == SIGALRM)
timed_out = 1;
}
#endif
int
tty_cmd_handler(pinentry_t pinentry)
{
int rc = 0;
FILE *ttyfi = stdin;
FILE *ttyfo = stdout;
#ifndef HAVE_DOSISH_SYSTEM
timed_out = 0;
if (pinentry->timeout)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = catchsig;
sigaction(SIGALRM, &sa, NULL);
alarm(pinentry->timeout);
}
#endif
if (pinentry->ttyname)
{
ttyfi = fopen (pinentry->ttyname, "r");
if (!ttyfi)
rc = -1;
else
{
ttyfo = fopen (pinentry->ttyname, "w");
if (!ttyfo)
{
int err = errno;
fclose (ttyfi);
errno = err;
rc = -1;
}
}
}
if (! rc)
{
if (pinentry->pin)
rc = password (pinentry, ttyfi, ttyfo);
else
rc = confirm (pinentry, ttyfi, ttyfo);
}
do_touch_file (pinentry);
if (pinentry->ttyname)
{
fclose (ttyfi);
fclose (ttyfo);
}
return rc;
}
pinentry_cmd_handler_t pinentry_cmd_handler = tty_cmd_handler;
int
main (int argc, char *argv[])
{
pinentry_init ("pinentry-tty");
/* Consumes all arguments. */
pinentry_parse_opts(argc, argv);
if (pinentry_loop ())
return 1;
return 0;
}

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Expires
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