120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$Id: readpass.c,v 1.10 2000/04/14 10:30:32 markus Exp $");
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#include "xmalloc.h"
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#include "ssh.h"
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volatile int intr;
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void
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intcatch()
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{
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intr = 1;
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}
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/*
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* Reads a passphrase from /dev/tty with echo turned off. Returns the
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* passphrase (allocated with xmalloc), being very careful to ensure that
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* no other userland buffer is storing the password.
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*/
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char *
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read_passphrase(const char *prompt, int from_stdin)
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{
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char buf[1024], *p, ch;
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struct termios tio, saved_tio;
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sigset_t oset, nset;
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struct sigaction sa, osa;
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int input, output, echo = 0;
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if (from_stdin) {
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input = STDIN_FILENO;
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output = STDERR_FILENO;
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} else
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input = output = open("/dev/tty", O_RDWR);
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if (input == -1)
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fatal("You have no controlling tty. Cannot read passphrase.\n");
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/* block signals, get terminal modes and turn off echo */
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sigemptyset(&nset);
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sigaddset(&nset, SIGTSTP);
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(void) sigprocmask(SIG_BLOCK, &nset, &oset);
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = intcatch;
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(void) sigaction(SIGINT, &sa, &osa);
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intr = 0;
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if (tcgetattr(input, &saved_tio) == 0 && (saved_tio.c_lflag & ECHO)) {
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echo = 1;
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tio = saved_tio;
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tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
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(void) tcsetattr(input, TCSANOW, &tio);
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}
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fflush(stdout);
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(void)write(output, prompt, strlen(prompt));
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for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) {
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if (intr)
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break;
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if (p < buf + sizeof(buf) - 1)
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*p++ = ch;
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}
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*p = '\0';
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if (!intr)
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(void)write(output, "\n", 1);
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/* restore terminal modes and allow signals */
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if (echo)
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tcsetattr(input, TCSANOW, &saved_tio);
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(void) sigprocmask(SIG_SETMASK, &oset, NULL);
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(void) sigaction(SIGINT, &osa, NULL);
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if (intr) {
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kill(getpid(), SIGINT);
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sigemptyset(&nset);
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/* XXX tty has not neccessarily drained by now? */
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sigsuspend(&nset);
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}
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if (!from_stdin)
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(void)close(input);
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p = xstrdup(buf);
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memset(buf, 0, sizeof(buf));
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return (p);
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}
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