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8efc0c15 | 1 | /* |
2d86a6cc | 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. | |
5260325f | 32 | */ |
8efc0c15 | 33 | |
34 | #include "includes.h" | |
74fc9186 | 35 | RCSID("$OpenBSD: readpass.c,v 1.11 2000/06/20 01:39:44 markus Exp $"); |
8efc0c15 | 36 | |
37 | #include "xmalloc.h" | |
38 | #include "ssh.h" | |
39 | ||
9bc5ddfe | 40 | volatile int intr; |
41 | ||
42 | void | |
43 | intcatch() | |
44 | { | |
45 | intr = 1; | |
46 | } | |
47 | ||
aa3378df | 48 | /* |
49 | * Reads a passphrase from /dev/tty with echo turned off. Returns the | |
2d86a6cc | 50 | * passphrase (allocated with xmalloc), being very careful to ensure that |
51 | * no other userland buffer is storing the password. | |
aa3378df | 52 | */ |
5260325f | 53 | char * |
54 | read_passphrase(const char *prompt, int from_stdin) | |
8efc0c15 | 55 | { |
2d86a6cc | 56 | char buf[1024], *p, ch; |
57 | struct termios tio, saved_tio; | |
58 | sigset_t oset, nset; | |
9bc5ddfe | 59 | struct sigaction sa, osa; |
2d86a6cc | 60 | int input, output, echo = 0; |
6ae2364d | 61 | |
2d86a6cc | 62 | if (from_stdin) { |
63 | input = STDIN_FILENO; | |
64 | output = STDERR_FILENO; | |
65 | } else | |
66 | input = output = open("/dev/tty", O_RDWR); | |
67 | ||
68 | if (input == -1) | |
69 | fatal("You have no controlling tty. Cannot read passphrase.\n"); | |
5260325f | 70 | |
2d86a6cc | 71 | /* block signals, get terminal modes and turn off echo */ |
72 | sigemptyset(&nset); | |
2d86a6cc | 73 | sigaddset(&nset, SIGTSTP); |
74 | (void) sigprocmask(SIG_BLOCK, &nset, &oset); | |
9bc5ddfe | 75 | memset(&sa, 0, sizeof(sa)); |
76 | sa.sa_handler = intcatch; | |
77 | (void) sigaction(SIGINT, &sa, &osa); | |
2d86a6cc | 78 | |
9bc5ddfe | 79 | intr = 0; |
80 | ||
81 | if (tcgetattr(input, &saved_tio) == 0 && (saved_tio.c_lflag & ECHO)) { | |
2d86a6cc | 82 | echo = 1; |
9bc5ddfe | 83 | tio = saved_tio; |
2d86a6cc | 84 | tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); |
85 | (void) tcsetattr(input, TCSANOW, &tio); | |
8efc0c15 | 86 | } |
8efc0c15 | 87 | |
5260325f | 88 | fflush(stdout); |
5260325f | 89 | |
2d86a6cc | 90 | (void)write(output, prompt, strlen(prompt)); |
9bc5ddfe | 91 | for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) { |
92 | if (intr) | |
93 | break; | |
2d86a6cc | 94 | if (p < buf + sizeof(buf) - 1) |
95 | *p++ = ch; | |
9bc5ddfe | 96 | } |
2d86a6cc | 97 | *p = '\0'; |
9bc5ddfe | 98 | if (!intr) |
99 | (void)write(output, "\n", 1); | |
5260325f | 100 | |
2d86a6cc | 101 | /* restore terminal modes and allow signals */ |
102 | if (echo) | |
103 | tcsetattr(input, TCSANOW, &saved_tio); | |
104 | (void) sigprocmask(SIG_SETMASK, &oset, NULL); | |
9bc5ddfe | 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 | } | |
5260325f | 113 | |
2d86a6cc | 114 | if (!from_stdin) |
115 | (void)close(input); | |
116 | p = xstrdup(buf); | |
5260325f | 117 | memset(buf, 0, sizeof(buf)); |
2d86a6cc | 118 | return (p); |
8efc0c15 | 119 | } |