Damien Miller | c8a3868 | 2001-06-25 18:09:16 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com> |
| 3 | * 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. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 17 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 18 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| 19 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #if defined(LIBC_SCCS) && !defined(lint) |
Damien Miller | b90416b | 2001-06-27 23:26:38 +1000 | [diff] [blame^] | 29 | static char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.5 2001/06/27 13:23:30 djm Exp $"; |
Damien Miller | c8a3868 | 2001-06-25 18:09:16 +1000 | [diff] [blame] | 30 | #endif /* LIBC_SCCS and not lint */ |
| 31 | |
| 32 | #include "includes.h" |
| 33 | |
| 34 | #ifndef HAVE_READPASSPHRASE |
| 35 | |
| 36 | #include <termios.h> |
| 37 | #include <readpassphrase.h> |
| 38 | |
| 39 | #ifdef TCSASOFT |
| 40 | # define _T_FLUSH (TCSAFLUSH|TCSASOFT) |
| 41 | #else |
| 42 | # define _T_FLUSH (TCSAFLUSH) |
| 43 | #endif |
| 44 | |
| 45 | char * |
| 46 | readpassphrase(prompt, buf, bufsiz, flags) |
| 47 | const char *prompt; |
| 48 | char *buf; |
| 49 | size_t bufsiz; |
| 50 | int flags; |
| 51 | { |
| 52 | struct termios term; |
| 53 | char ch, *p, *end; |
| 54 | u_char status; |
| 55 | int echo, input, output; |
| 56 | sigset_t oset, nset; |
| 57 | |
| 58 | /* I suppose we could alloc on demand in this case (XXX). */ |
| 59 | if (bufsiz == 0) { |
| 60 | errno = EINVAL; |
| 61 | return(NULL); |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * Read and write to /dev/tty if available. If not, read from |
| 66 | * stdin and write to stderr unless a tty is required. |
| 67 | */ |
| 68 | if ((input = output = open(_PATH_TTY, O_RDWR)) == -1) { |
| 69 | if (flags & RPP_REQUIRE_TTY) { |
| 70 | errno = ENOTTY; |
| 71 | return(NULL); |
| 72 | } |
| 73 | input = STDIN_FILENO; |
| 74 | output = STDERR_FILENO; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * We block SIGINT and SIGTSTP so the terminal is not left |
| 79 | * in an inconsistent state (ie: no echo). It would probably |
| 80 | * be better to simply catch these though. |
| 81 | */ |
| 82 | sigemptyset(&nset); |
| 83 | sigaddset(&nset, SIGINT); |
| 84 | sigaddset(&nset, SIGTSTP); |
| 85 | (void)sigprocmask(SIG_BLOCK, &nset, &oset); |
| 86 | |
| 87 | /* Turn off echo if possible. */ |
| 88 | echo = 0; |
| 89 | status = _POSIX_VDISABLE; |
| 90 | if (tcgetattr(input, &term) == 0) { |
| 91 | if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO)) { |
| 92 | echo = 1; |
| 93 | term.c_lflag &= ~ECHO; |
| 94 | } |
| 95 | #ifdef VSTATUS |
| 96 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) { |
| 97 | status = term.c_cc[VSTATUS]; |
| 98 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
| 99 | } |
| 100 | #endif |
| 101 | (void)tcsetattr(input, _T_FLUSH, &term); |
| 102 | } |
| 103 | if (!(flags & RPP_ECHO_ON)) { |
| 104 | if (tcgetattr(input, &term) == 0 && (term.c_lflag & ECHO)) { |
| 105 | echo = 1; |
| 106 | term.c_lflag &= ~ECHO; |
| 107 | (void)tcsetattr(input, _T_FLUSH, &term); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | (void)write(output, prompt, strlen(prompt)); |
| 112 | end = buf + bufsiz - 1; |
| 113 | for (p = buf; read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) { |
| 114 | if (p < end) { |
| 115 | if ((flags & RPP_SEVENBIT)) |
Damien Miller | b90416b | 2001-06-27 23:26:38 +1000 | [diff] [blame^] | 116 | ch &= 0x7f; |
Damien Miller | c8a3868 | 2001-06-25 18:09:16 +1000 | [diff] [blame] | 117 | if (isalpha(ch)) { |
| 118 | if ((flags & RPP_FORCELOWER)) |
| 119 | ch = tolower(ch); |
| 120 | if ((flags & RPP_FORCEUPPER)) |
| 121 | ch = toupper(ch); |
| 122 | } |
| 123 | *p++ = ch; |
| 124 | } |
| 125 | } |
| 126 | *p = '\0'; |
| 127 | if (echo || status != _POSIX_VDISABLE) { |
| 128 | if (echo) { |
| 129 | (void)write(output, "\n", 1); |
| 130 | term.c_lflag |= ECHO; |
| 131 | } |
| 132 | #ifdef VSTATUS |
| 133 | if (status != _POSIX_VDISABLE) |
| 134 | term.c_cc[VSTATUS] = status; |
| 135 | #endif |
| 136 | (void)tcsetattr(input, _T_FLUSH, &term); |
| 137 | } |
| 138 | (void)sigprocmask(SIG_SETMASK, &oset, NULL); |
| 139 | if (input != STDIN_FILENO) |
| 140 | (void)close(input); |
| 141 | return(buf); |
| 142 | } |
| 143 | #endif /* HAVE_READPASSPHRASE */ |
| 144 | |
| 145 | #if 0 |
| 146 | char * |
| 147 | getpass(prompt) |
| 148 | const char *prompt; |
| 149 | { |
| 150 | static char buf[_PASSWORD_LEN + 1]; |
| 151 | |
| 152 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); |
| 153 | } |
| 154 | #endif |