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/*
readpass.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Mon Jul 10 22:08:59 1995 ylo
Functions for reading passphrases and passwords.
*/
/*
* $Id: readpass.c,v 1.6 1997/05/13 22:30:18 kivinen Exp $
* $Log: readpass.c,v $
* Revision 1.6 1997/05/13 22:30:18 kivinen
* Added some casts.
*
* Revision 1.5 1997/04/17 04:01:52 kivinen
* Added read_confirmation function.
*
* Revision 1.4 1997/04/05 21:49:28 kivinen
* Fixed the '-quoting from \' to '\''.
*
* Revision 1.3 1997/03/26 07:15:23 kivinen
* Fixed prompt quoting so ' will be quoted only if in command
* line.
*
* Revision 1.2 1997/03/19 17:36:18 kivinen
* Quote all unprintable characters in password prompt. Also
* quote all '-characters.
*
* Revision 1.1.1.1 1996/02/18 21:38:12 ylo
* Imported ssh-1.2.13.
*
* Revision 1.2 1995/07/13 01:31:04 ylo
* Removed "Last modified" header.
* Added cvs log.
*
* $Endlog$
*/
#include "includes.h"
#include "xmalloc.h"
#include "ssh.h"
#include "userfile.h"
/* Saved old terminal mode for read_passphrase. */
#ifdef USING_TERMIOS
static struct termios saved_tio;
#endif
#ifdef USING_SGTTY
static struct sgttyb saved_tio;
#endif
/* Old interrupt signal handler for read_passphrase. */
static RETSIGTYPE (*old_handler)(int sig) = NULL;
/* Interrupt signal handler for read_passphrase. */
RETSIGTYPE intr_handler(int sig)
{
/* Restore terminal modes. */
#ifdef USING_TERMIOS
tcsetattr(fileno(stdin), TCSANOW, &saved_tio);
#endif
#ifdef USING_SGTTY
ioctl(fileno(stdin), TIOCSETP, &saved_tio);
#endif
/* Restore the old signal handler. */
signal(sig, old_handler);
/* Resend the signal, with the old handler. */
kill(getpid(), sig);
}
/* Reads a passphrase from /dev/tty with echo turned off. Returns the
passphrase (allocated with xmalloc). Exits if EOF is encountered.
The passphrase if read from stdin if from_stdin is true (as is the
case with ssh-keygen). */
char *read_passphrase(uid_t uid, const char *prompt, int from_stdin)
{
char buf[1024], *cp;
unsigned char quoted_prompt[512];
unsigned const char *p;
#ifdef USING_TERMIOS
struct termios tio;
#endif
#ifdef USING_SGTTY
struct sgttyb tio;
#endif
FILE *f;
UserFile uf;
int i;
if (from_stdin)
f = stdin;
else
{
/* Read the passphrase from /dev/tty to make it possible to ask it even
when stdin has been redirected. */
f = fopen("/dev/tty", "r");
if (!f)
{
if (getenv("DISPLAY"))
{
char command[512];
fprintf(stderr,
"Executing ssh-askpass to query the password...\n");
fflush(stdout);
fflush(stderr);
for(p = (unsigned const char *) prompt, i = 0;
i < sizeof(quoted_prompt) - 5 && *p;
i++, p++)
{
if (*p == '\'')
{
quoted_prompt[i++] = '\'';
quoted_prompt[i++] = '\\';
quoted_prompt[i++] = '\'';
quoted_prompt[i] = '\'';
}
else if (isprint(*p) || isspace(*p))
quoted_prompt[i] = *p;
else if (iscntrl(*p))
{
quoted_prompt[i++] = '^';
if (*p < ' ')
quoted_prompt[i] = *p + '@';
else
quoted_prompt[i] = '?';
}
else if (*p > 128)
quoted_prompt[i] = *p;
}
quoted_prompt[i] = '\0';
sprintf(command, "ssh-askpass '%.400s'", quoted_prompt);
uf = userfile_popen(uid, command, "r");
if (uf == NULL)
{
fprintf(stderr, "Could not query passphrase: '%.200s' failed.\n",
command);
exit(1);
}
if (!userfile_gets(buf, sizeof(buf), uf))
{
userfile_pclose(uf);
fprintf(stderr, "No passphrase supplied. Exiting.\n");
exit(1);
}
userfile_pclose(uf);
if (strchr(buf, '\n'))
*strchr(buf, '\n') = 0;
return xstrdup(buf);
}
/* No controlling terminal and no DISPLAY. Nowhere to read. */
fprintf(stderr, "You have no controlling tty and no DISPLAY. Cannot read passphrase.\n");
exit(1);
}
}
for(p = (unsigned const char *) prompt, i = 0;
i < sizeof(quoted_prompt) - 4 && *p; i++, p++)
{
if (isprint(*p) || isspace(*p))
quoted_prompt[i] = *p;
else if (iscntrl(*p))
{
quoted_prompt[i++] = '^';
if (*p < ' ')
quoted_prompt[i] = *p + '@';
else
quoted_prompt[i] = '?';
}
else if (*p > 128)
quoted_prompt[i] = *p;
}
quoted_prompt[i] = '\0';
/* Display the prompt (on stderr because stdout might be redirected). */
fflush(stdout);
fprintf(stderr, "%s", quoted_prompt);
fflush(stderr);
/* Get terminal modes. */
#ifdef USING_TERMIOS
tcgetattr(fileno(f), &tio);
#endif
#ifdef USING_SGTTY
ioctl(fileno(f), TIOCGETP, &tio);
#endif
saved_tio = tio;
/* Save signal handler and set the new handler. */
old_handler = signal(SIGINT, intr_handler);
/* Set new terminal modes disabling all echo. */
#ifdef USING_TERMIOS
tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
tcsetattr(fileno(f), TCSANOW, &tio);
#endif
#ifdef USING_SGTTY
tio.sg_flags &= ~(ECHO);
ioctl(fileno(f), TIOCSETP, &tio);
#endif
/* Read the passphrase from the terminal. */
if (fgets(buf, sizeof(buf), f) == NULL)
{
/* Got EOF. Just exit. */
/* Restore terminal modes. */
#ifdef USING_TERMIOS
tcsetattr(fileno(f), TCSANOW, &saved_tio);
#endif
#ifdef USING_SGTTY
ioctl(fileno(f), TIOCSETP, &saved_tio);
#endif
/* Restore the signal handler. */
signal(SIGINT, old_handler);
/* Print a newline (the prompt probably didn\'t have one). */
fprintf(stderr, "\n");
/* Close the file. */
if (f != stdin)
fclose(f);
exit(1);
}
/* Restore terminal modes. */
#ifdef USING_TERMIOS
tcsetattr(fileno(f), TCSANOW, &saved_tio);
#endif
#ifdef USING_SGTTY
ioctl(fileno(f), TIOCSETP, &saved_tio);
#endif
/* Restore the signal handler. */
(void)signal(SIGINT, old_handler);
/* Remove newline from the passphrase. */
if (strchr(buf, '\n'))
*strchr(buf, '\n') = 0;
/* Allocate a copy of the passphrase. */
cp = xstrdup(buf);
/* Clear the buffer so we don\'t leave copies of the passphrase laying
around. */
memset(buf, 0, sizeof(buf));
/* Print a newline since the prompt probably didn\'t have one. */
fprintf(stderr, "\n");
/* Close the file. */
if (f != stdin)
fclose(f);
return cp;
}
/* Reads a yes/no confirmation from /dev/tty. Exits if EOF or "no" is
encountered. */
void read_confirmation(const char *prompt)
{
char buf[1024], *p;
FILE *f;
if (isatty(fileno(stdin)))
f = stdin;
else
{
/* Read the passphrase from /dev/tty to make it possible to ask it even
when stdin has been redirected. */
f = fopen("/dev/tty", "r");
if (!f)
{
fprintf(stderr, "You have no controlling tty. Cannot read confirmation.\n");
exit(1);
}
}
/* Read the passphrase from the terminal. */
do
{
/* Display the prompt (on stderr because stdout might be redirected). */
fflush(stdout);
fprintf(stderr, "%s", prompt);
fflush(stderr);
/* Read line */
if (fgets(buf, sizeof(buf), f) == NULL)
{
/* Got EOF. Just exit. */
/* Print a newline (the prompt probably didn\'t have one). */
fprintf(stderr, "\n");
fprintf(stderr, "Aborted by user");
/* Close the file. */
if (f != stdin)
fclose(f);
exit(1);
}
p = buf + strlen(buf) - 1;
while (p > buf && isspace(*p))
*p-- = '\0';
p = buf;
while (*p && isspace(*p))
p++;
if (strcmp(p, "no") == 0)
{
/* Close the file. */
if (f != stdin)
fclose(f);
exit(1);
}
} while (strcmp(p, "yes") != 0);
/* Close the file. */
if (f != stdin)
fclose(f);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.