1 /* $OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt Exp $ */
4 * Copyright (c) 2000-2002, 2007, 2010
5 * Todd C. Miller <Todd.Miller@courtesan.com>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 * Sponsored in part by the Defense Advanced Research Projects
20 * Agency (DARPA) and Air Force Research Laboratory, Air Force
21 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
24 #include <sys/cdefs.h>
25 #include "namespace.h"
35 #include <readpassphrase.h>
36 #include "un-namespace.h"
37 #include "libc_private.h"
39 static volatile sig_atomic_t signo[NSIG];
41 static void handler(int);
44 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
47 int input, output, save_errno, i, need_restart, input_is_tty;
49 struct termios term, oterm;
50 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
51 struct sigaction savetstp, savettin, savettou, savepipe;
53 /* I suppose we could alloc on demand in this case (XXX). */
60 for (i = 0; i < NSIG; i++)
66 * Read and write to /dev/tty if available. If not, read from
67 * stdin and write to stderr unless a tty is required.
70 if (!(flags & RPP_STDIN)) {
71 input = output = _open(_PATH_TTY, O_RDWR | O_CLOEXEC);
73 if (flags & RPP_REQUIRE_TTY) {
78 output = STDERR_FILENO;
84 output = STDERR_FILENO;
88 * Turn off echo if possible.
89 * If we are using a tty but are not the foreground pgrp this will
90 * generate SIGTTOU, so do it *before* installing the signal handlers.
92 if (input_is_tty && tcgetattr(input, &oterm) == 0) {
93 memcpy(&term, &oterm, sizeof(term));
94 if (!(flags & RPP_ECHO_ON))
95 term.c_lflag &= ~(ECHO | ECHONL);
96 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
97 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
98 (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
100 memset(&term, 0, sizeof(term));
101 term.c_lflag |= ECHO;
102 memset(&oterm, 0, sizeof(oterm));
103 oterm.c_lflag |= ECHO;
107 * Catch signals that would otherwise cause the user to end
108 * up with echo turned off in the shell. Don't worry about
109 * things like SIGXCPU and SIGVTALRM for now.
111 sigemptyset(&sa.sa_mask);
112 sa.sa_flags = 0; /* don't restart system calls */
113 sa.sa_handler = handler;
114 (void)__libc_sigaction(SIGALRM, &sa, &savealrm);
115 (void)__libc_sigaction(SIGHUP, &sa, &savehup);
116 (void)__libc_sigaction(SIGINT, &sa, &saveint);
117 (void)__libc_sigaction(SIGPIPE, &sa, &savepipe);
118 (void)__libc_sigaction(SIGQUIT, &sa, &savequit);
119 (void)__libc_sigaction(SIGTERM, &sa, &saveterm);
120 (void)__libc_sigaction(SIGTSTP, &sa, &savetstp);
121 (void)__libc_sigaction(SIGTTIN, &sa, &savettin);
122 (void)__libc_sigaction(SIGTTOU, &sa, &savettou);
124 if (!(flags & RPP_STDIN))
125 (void)_write(output, prompt, strlen(prompt));
126 end = buf + bufsiz - 1;
128 while ((nr = _read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
130 if ((flags & RPP_SEVENBIT))
132 if (isalpha((unsigned char)ch)) {
133 if ((flags & RPP_FORCELOWER))
134 ch = (char)tolower((unsigned char)ch);
135 if ((flags & RPP_FORCEUPPER))
136 ch = (char)toupper((unsigned char)ch);
143 if (!(term.c_lflag & ECHO))
144 (void)_write(output, "\n", 1);
146 /* Restore old terminal settings and signals. */
147 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
148 while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
149 errno == EINTR && !signo[SIGTTOU])
152 (void)__libc_sigaction(SIGALRM, &savealrm, NULL);
153 (void)__libc_sigaction(SIGHUP, &savehup, NULL);
154 (void)__libc_sigaction(SIGINT, &saveint, NULL);
155 (void)__libc_sigaction(SIGQUIT, &savequit, NULL);
156 (void)__libc_sigaction(SIGPIPE, &savepipe, NULL);
157 (void)__libc_sigaction(SIGTERM, &saveterm, NULL);
158 (void)__libc_sigaction(SIGTSTP, &savetstp, NULL);
159 (void)__libc_sigaction(SIGTTIN, &savettin, NULL);
160 (void)__libc_sigaction(SIGTTOU, &savettou, NULL);
165 * If we were interrupted by a signal, resend it to ourselves
166 * now that we have restored the signal handlers.
168 for (i = 0; i < NSIG; i++) {
184 return(nr == -1 ? NULL : buf);
188 getpass(const char *prompt)
190 static char buf[_PASSWORD_LEN + 1];
192 if (readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF) == NULL)
197 static void handler(int s)