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 | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 35 | RCSID("$Id: readpass.c,v 1.5 2000/01/22 08:47:21 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 | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 40 | volatile int intr; |
| 41 | |
| 42 | void |
| 43 | intcatch() |
| 44 | { |
| 45 | intr = 1; |
| 46 | } |
| 47 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 48 | /* |
| 49 | * Reads a passphrase from /dev/tty with echo turned off. Returns the |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 50 | * passphrase (allocated with xmalloc), being very careful to ensure that |
| 51 | * no other userland buffer is storing the password. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 52 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 53 | char * |
| 54 | read_passphrase(const char *prompt, int from_stdin) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | { |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 56 | char buf[1024], *p, ch; |
| 57 | struct termios tio, saved_tio; |
| 58 | sigset_t oset, nset; |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 59 | struct sigaction sa, osa; |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 60 | int input, output, echo = 0; |
| 61 | |
| 62 | if (from_stdin) { |
| 63 | input = STDIN_FILENO; |
| 64 | output = STDERR_FILENO; |
| 65 | } else |
| 66 | input = output = open("/dev/tty", O_RDWR); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 67 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 68 | if (input == -1) |
| 69 | fatal("You have no controlling tty. Cannot read passphrase.\n"); |
| 70 | |
| 71 | /* block signals, get terminal modes and turn off echo */ |
| 72 | sigemptyset(&nset); |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 73 | sigaddset(&nset, SIGTSTP); |
| 74 | (void) sigprocmask(SIG_BLOCK, &nset, &oset); |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 75 | memset(&sa, 0, sizeof(sa)); |
| 76 | sa.sa_handler = intcatch; |
| 77 | (void) sigaction(SIGINT, &sa, &osa); |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 78 | |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 79 | intr = 0; |
| 80 | |
| 81 | if (tcgetattr(input, &saved_tio) == 0 && (saved_tio.c_lflag & ECHO)) { |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 82 | echo = 1; |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 83 | tio = saved_tio; |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 84 | tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); |
| 85 | (void) tcsetattr(input, TCSANOW, &tio); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 86 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 88 | fflush(stdout); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 90 | (void)write(output, prompt, strlen(prompt)); |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 91 | for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) { |
| 92 | if (intr) |
| 93 | break; |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 94 | if (p < buf + sizeof(buf) - 1) |
| 95 | *p++ = ch; |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 96 | } |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 97 | *p = '\0'; |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 98 | if (!intr) |
| 99 | (void)write(output, "\n", 1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 100 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 101 | /* restore terminal modes and allow signals */ |
| 102 | if (echo) |
| 103 | tcsetattr(input, TCSANOW, &saved_tio); |
| 104 | (void) sigprocmask(SIG_SETMASK, &oset, NULL); |
Damien Miller | f052aaf | 2000-01-22 19:47:21 +1100 | [diff] [blame] | 105 | (void) sigaction(SIGINT, &osa, NULL); |
| 106 | |
| 107 | if (intr) { |
| 108 | kill(getpid(), SIGINT); |
| 109 | sigemptyset(&nset); |
| 110 | /* XXX tty has not neccessarily drained by now? */ |
| 111 | sigsuspend(&nset); |
| 112 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 114 | if (!from_stdin) |
| 115 | (void)close(input); |
| 116 | p = xstrdup(buf); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 117 | memset(buf, 0, sizeof(buf)); |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 118 | return (p); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | } |