Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 2 | * Copyright (c) 1988, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 32 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 33 | |
| 34 | #include "includes.h" |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 35 | RCSID("$Id: readpass.c,v 1.4 1999/12/08 23:31:37 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
| 37 | #include "xmalloc.h" |
| 38 | #include "ssh.h" |
| 39 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 40 | /* |
| 41 | * Reads a passphrase from /dev/tty with echo turned off. Returns the |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 42 | * passphrase (allocated with xmalloc), being very careful to ensure that |
| 43 | * no other userland buffer is storing the password. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 44 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 45 | char * |
| 46 | read_passphrase(const char *prompt, int from_stdin) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | { |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 48 | char buf[1024], *p, ch; |
| 49 | struct termios tio, saved_tio; |
| 50 | sigset_t oset, nset; |
| 51 | int input, output, echo = 0; |
| 52 | |
| 53 | if (from_stdin) { |
| 54 | input = STDIN_FILENO; |
| 55 | output = STDERR_FILENO; |
| 56 | } else |
| 57 | input = output = open("/dev/tty", O_RDWR); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 58 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 59 | if (input == -1) |
| 60 | fatal("You have no controlling tty. Cannot read passphrase.\n"); |
| 61 | |
| 62 | /* block signals, get terminal modes and turn off echo */ |
| 63 | sigemptyset(&nset); |
| 64 | sigaddset(&nset, SIGINT); |
| 65 | sigaddset(&nset, SIGTSTP); |
| 66 | (void) sigprocmask(SIG_BLOCK, &nset, &oset); |
| 67 | |
| 68 | if (tcgetattr(input, &tio) == 0 && (tio.c_lflag & ECHO)) { |
| 69 | echo = 1; |
| 70 | saved_tio = tio; |
| 71 | tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); |
| 72 | (void) tcsetattr(input, TCSANOW, &tio); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 73 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 74 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 75 | fflush(stdout); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 76 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 77 | (void)write(output, prompt, strlen(prompt)); |
| 78 | for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) |
| 79 | if (p < buf + sizeof(buf) - 1) |
| 80 | *p++ = ch; |
| 81 | *p = '\0'; |
| 82 | (void)write(output, "\n", 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 84 | /* restore terminal modes and allow signals */ |
| 85 | if (echo) |
| 86 | tcsetattr(input, TCSANOW, &saved_tio); |
| 87 | (void) sigprocmask(SIG_SETMASK, &oset, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 88 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 89 | if (!from_stdin) |
| 90 | (void)close(input); |
| 91 | p = xstrdup(buf); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 92 | memset(buf, 0, sizeof(buf)); |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 93 | return (p); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | } |