2 * Copyright (c) 2000-2002, 2007, 2010
3 * Todd C. Miller <Todd.Miller@courtesan.com>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Sponsored in part by the Defense Advanced Research Projects
18 * Agency (DARPA) and Air Force Research Laboratory, Air Force
19 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
21 * $OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt Exp $
22 * $FreeBSD: head/lib/libc/gen/readpassphrase.c 294691 2016-01-24 22:20:13Z sobomax $
25 #include "namespace.h"
35 #include <readpassphrase.h>
36 #include "un-namespace.h"
38 static volatile sig_atomic_t signo
[NSIG
];
40 static void handler(int);
43 readpassphrase(const char *prompt
, char *buf
, size_t bufsiz
, int flags
)
46 int input
, output
, save_errno
, i
, need_restart
, input_is_tty
;
48 struct termios term
, oterm
;
49 struct sigaction sa
, savealrm
, saveint
, savehup
, savequit
, saveterm
;
50 struct sigaction savetstp
, savettin
, savettou
, savepipe
;
52 /* I suppose we could alloc on demand in this case (XXX). */
59 for (i
= 0; i
< NSIG
; i
++)
65 * Read and write to /dev/tty if available. If not, read from
66 * stdin and write to stderr unless a tty is required.
69 if (!(flags
& RPP_STDIN
)) {
70 input
= output
= _open(_PATH_TTY
, O_RDWR
| O_CLOEXEC
);
72 if (flags
& RPP_REQUIRE_TTY
) {
77 output
= STDERR_FILENO
;
83 output
= STDERR_FILENO
;
87 * Turn off echo if possible.
88 * If we are using a tty but are not the foreground pgrp this will
89 * generate SIGTTOU, so do it *before* installing the signal handlers.
91 if (input_is_tty
&& tcgetattr(input
, &oterm
) == 0) {
92 memcpy(&term
, &oterm
, sizeof(term
));
93 if (!(flags
& RPP_ECHO_ON
))
94 term
.c_lflag
&= ~(ECHO
| ECHONL
);
95 if (term
.c_cc
[VSTATUS
] != _POSIX_VDISABLE
)
96 term
.c_cc
[VSTATUS
] = _POSIX_VDISABLE
;
97 tcsetattr(input
, TCSAFLUSH
|TCSASOFT
, &term
);
99 memset(&term
, 0, sizeof(term
));
100 term
.c_lflag
|= ECHO
;
101 memset(&oterm
, 0, sizeof(oterm
));
102 oterm
.c_lflag
|= ECHO
;
106 * Catch signals that would otherwise cause the user to end
107 * up with echo turned off in the shell. Don't worry about
108 * things like SIGXCPU and SIGVTALRM for now.
110 sigemptyset(&sa
.sa_mask
);
111 sa
.sa_flags
= 0; /* don't restart system calls */
112 sa
.sa_handler
= handler
;
113 _sigaction(SIGALRM
, &sa
, &savealrm
);
114 _sigaction(SIGHUP
, &sa
, &savehup
);
115 _sigaction(SIGINT
, &sa
, &saveint
);
116 _sigaction(SIGPIPE
, &sa
, &savepipe
);
117 _sigaction(SIGQUIT
, &sa
, &savequit
);
118 _sigaction(SIGTERM
, &sa
, &saveterm
);
119 _sigaction(SIGTSTP
, &sa
, &savetstp
);
120 _sigaction(SIGTTIN
, &sa
, &savettin
);
121 _sigaction(SIGTTOU
, &sa
, &savettou
);
123 if (!(flags
& RPP_STDIN
))
124 _write(output
, prompt
, strlen(prompt
));
125 end
= buf
+ bufsiz
- 1;
127 while ((nr
= _read(input
, &ch
, 1)) == 1 && ch
!= '\n' && ch
!= '\r') {
129 if ((flags
& RPP_SEVENBIT
))
131 if (isalpha((unsigned char)ch
)) {
132 if ((flags
& RPP_FORCELOWER
))
133 ch
= (char)tolower((unsigned char)ch
);
134 if ((flags
& RPP_FORCEUPPER
))
135 ch
= (char)toupper((unsigned char)ch
);
142 if (!(term
.c_lflag
& ECHO
))
143 _write(output
, "\n", 1);
145 /* Restore old terminal settings and signals. */
146 if (memcmp(&term
, &oterm
, sizeof(term
)) != 0) {
147 while (tcsetattr(input
, TCSAFLUSH
|TCSASOFT
, &oterm
) == -1 &&
148 errno
== EINTR
&& !signo
[SIGTTOU
])
151 _sigaction(SIGALRM
, &savealrm
, NULL
);
152 _sigaction(SIGHUP
, &savehup
, NULL
);
153 _sigaction(SIGINT
, &saveint
, NULL
);
154 _sigaction(SIGQUIT
, &savequit
, NULL
);
155 _sigaction(SIGPIPE
, &savepipe
, NULL
);
156 _sigaction(SIGTERM
, &saveterm
, NULL
);
157 _sigaction(SIGTSTP
, &savetstp
, NULL
);
158 _sigaction(SIGTTIN
, &savettin
, NULL
);
159 _sigaction(SIGTTOU
, &savettou
, NULL
);
164 * If we were interrupted by a signal, resend it to ourselves
165 * now that we have restored the signal handlers.
167 for (i
= 0; i
< NSIG
; i
++) {
183 return(nr
== -1 ? NULL
: buf
);
187 getpass(const char *prompt
)
189 static char buf
[_PASSWORD_LEN
+ 1];
191 if (readpassphrase(prompt
, buf
, sizeof(buf
), RPP_ECHO_OFF
) == NULL
)