1 /* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */
4 * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 * Sponsored in part by the Defense Advanced Research Projects
19 * Agency (DARPA) and Air Force Research Laboratory, Air Force
20 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
23 /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
27 #ifndef HAVE_READPASSPHRASE
33 #include <readpassphrase.h>
39 # define _T_FLUSH (TCSAFLUSH|TCSASOFT)
41 # define _T_FLUSH (TCSAFLUSH)
44 /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
45 #if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
46 # define _POSIX_VDISABLE VDISABLE
57 static volatile sig_atomic_t signo[_NSIG];
59 static void handler(int);
62 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
65 int input, output, save_errno, i, need_restart;
67 struct termios term, oterm;
68 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
69 struct sigaction savetstp, savettin, savettou, savepipe;
71 /* I suppose we could alloc on demand in this case (XXX). */
78 for (i = 0; i < _NSIG; i++)
84 * Read and write to /dev/tty if available. If not, read from
85 * stdin and write to stderr unless a tty is required.
87 if ((flags & RPP_STDIN) ||
88 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
89 if (flags & RPP_REQUIRE_TTY) {
94 output = STDERR_FILENO;
98 * Catch signals that would otherwise cause the user to end
99 * up with echo turned off in the shell. Don't worry about
100 * things like SIGXCPU and SIGVTALRM for now.
102 sigemptyset(&sa.sa_mask);
103 sa.sa_flags = 0; /* don't restart system calls */
104 sa.sa_handler = handler;
105 (void)sigaction(SIGALRM, &sa, &savealrm);
106 (void)sigaction(SIGHUP, &sa, &savehup);
107 (void)sigaction(SIGINT, &sa, &saveint);
108 (void)sigaction(SIGPIPE, &sa, &savepipe);
109 (void)sigaction(SIGQUIT, &sa, &savequit);
110 (void)sigaction(SIGTERM, &sa, &saveterm);
111 (void)sigaction(SIGTSTP, &sa, &savetstp);
112 (void)sigaction(SIGTTIN, &sa, &savettin);
113 (void)sigaction(SIGTTOU, &sa, &savettou);
115 /* Turn off echo if possible. */
116 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
117 memcpy(&term, &oterm, sizeof(term));
118 if (!(flags & RPP_ECHO_ON))
119 term.c_lflag &= ~(ECHO | ECHONL);
121 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
122 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
124 (void)tcsetattr(input, _T_FLUSH, &term);
126 memset(&term, 0, sizeof(term));
127 term.c_lflag |= ECHO;
128 memset(&oterm, 0, sizeof(oterm));
129 oterm.c_lflag |= ECHO;
132 /* No I/O if we are already backgrounded. */
133 if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) {
134 if (!(flags & RPP_STDIN))
135 (void)write(output, prompt, strlen(prompt));
136 end = buf + bufsiz - 1;
138 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
140 if ((flags & RPP_SEVENBIT))
143 if ((flags & RPP_FORCELOWER))
144 ch = (char)tolower(ch);
145 if ((flags & RPP_FORCEUPPER))
146 ch = (char)toupper(ch);
153 if (!(term.c_lflag & ECHO))
154 (void)write(output, "\n", 1);
157 /* Restore old terminal settings and signals. */
158 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
159 while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
163 (void)sigaction(SIGALRM, &savealrm, NULL);
164 (void)sigaction(SIGHUP, &savehup, NULL);
165 (void)sigaction(SIGINT, &saveint, NULL);
166 (void)sigaction(SIGQUIT, &savequit, NULL);
167 (void)sigaction(SIGPIPE, &savepipe, NULL);
168 (void)sigaction(SIGTERM, &saveterm, NULL);
169 (void)sigaction(SIGTSTP, &savetstp, NULL);
170 (void)sigaction(SIGTTIN, &savettin, NULL);
171 (void)sigaction(SIGTTOU, &savettou, NULL);
172 if (input != STDIN_FILENO)
176 * If we were interrupted by a signal, resend it to ourselves
177 * now that we have restored the signal handlers.
179 for (i = 0; i < _NSIG; i++) {
195 return(nr == -1 ? NULL : buf);
200 getpass(const char *prompt)
202 static char buf[_PASSWORD_LEN + 1];
204 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
208 static void handler(int s)
213 #endif /* HAVE_READPASSPHRASE */