1 /* $OpenBSD: readpassphrase.c,v 1.21 2008/01/17 16:27:07 millert 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
49 static volatile sig_atomic_t signo;
51 static void handler(int);
54 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
57 int input, output, save_errno;
59 struct termios term, oterm;
60 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
61 struct sigaction savetstp, savettin, savettou, savepipe;
63 /* I suppose we could alloc on demand in this case (XXX). */
74 * Read and write to /dev/tty if available. If not, read from
75 * stdin and write to stderr unless a tty is required.
77 if ((flags & RPP_STDIN) ||
78 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
79 if (flags & RPP_REQUIRE_TTY) {
84 output = STDERR_FILENO;
88 * Catch signals that would otherwise cause the user to end
89 * up with echo turned off in the shell. Don't worry about
90 * things like SIGXCPU and SIGVTALRM for now.
92 sigemptyset(&sa.sa_mask);
93 sa.sa_flags = 0; /* don't restart system calls */
94 sa.sa_handler = handler;
95 (void)sigaction(SIGALRM, &sa, &savealrm);
96 (void)sigaction(SIGHUP, &sa, &savehup);
97 (void)sigaction(SIGINT, &sa, &saveint);
98 (void)sigaction(SIGPIPE, &sa, &savepipe);
99 (void)sigaction(SIGQUIT, &sa, &savequit);
100 (void)sigaction(SIGTERM, &sa, &saveterm);
101 (void)sigaction(SIGTSTP, &sa, &savetstp);
102 (void)sigaction(SIGTTIN, &sa, &savettin);
103 (void)sigaction(SIGTTOU, &sa, &savettou);
105 /* Turn off echo if possible. */
106 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
107 memcpy(&term, &oterm, sizeof(term));
108 if (!(flags & RPP_ECHO_ON))
109 term.c_lflag &= ~(ECHO | ECHONL);
111 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
112 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
114 (void)tcsetattr(input, _T_FLUSH, &term);
116 memset(&term, 0, sizeof(term));
117 term.c_lflag |= ECHO;
118 memset(&oterm, 0, sizeof(oterm));
119 oterm.c_lflag |= ECHO;
122 /* No I/O if we are already backgrounded. */
123 if (signo != SIGTTOU && signo != SIGTTIN) {
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))
133 if ((flags & RPP_FORCELOWER))
134 ch = (char)tolower(ch);
135 if ((flags & RPP_FORCEUPPER))
136 ch = (char)toupper(ch);
143 if (!(term.c_lflag & ECHO))
144 (void)write(output, "\n", 1);
147 /* Restore old terminal settings and signals. */
148 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
149 while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
153 (void)sigaction(SIGALRM, &savealrm, NULL);
154 (void)sigaction(SIGHUP, &savehup, NULL);
155 (void)sigaction(SIGINT, &saveint, NULL);
156 (void)sigaction(SIGQUIT, &savequit, NULL);
157 (void)sigaction(SIGPIPE, &savepipe, NULL);
158 (void)sigaction(SIGTERM, &saveterm, NULL);
159 (void)sigaction(SIGTSTP, &savetstp, NULL);
160 (void)sigaction(SIGTTIN, &savettin, NULL);
161 (void)sigaction(SIGTTOU, &savettou, NULL);
162 if (input != STDIN_FILENO)
166 * If we were interrupted by a signal, resend it to ourselves
167 * now that we have restored the signal handlers.
170 kill(getpid(), signo);
181 return(nr == -1 ? NULL : buf);
186 getpass(const char *prompt)
188 static char buf[_PASSWORD_LEN + 1];
190 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
194 static void handler(int s)
199 #endif /* HAVE_READPASSPHRASE */