Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1 | /* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com> |
| 5 | * |
| 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. |
| 9 | * |
| 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. |
| 17 | * |
| 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. |
| 21 | */ |
| 22 | |
| 23 | /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */ |
| 24 | |
| 25 | #include "includes.h" |
| 26 | |
| 27 | #ifndef HAVE_READPASSPHRASE |
| 28 | |
| 29 | #include <termios.h> |
| 30 | #include <signal.h> |
| 31 | #include <ctype.h> |
| 32 | #include <fcntl.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 33 | #include <readpassphrase.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 34 | #include <errno.h> |
| 35 | #include <string.h> |
| 36 | #include <unistd.h> |
| 37 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 38 | #ifdef TCSASOFT |
| 39 | # define _T_FLUSH (TCSAFLUSH|TCSASOFT) |
| 40 | #else |
| 41 | # define _T_FLUSH (TCSAFLUSH) |
| 42 | #endif |
| 43 | |
| 44 | /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ |
| 45 | #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) |
| 46 | # define _POSIX_VDISABLE VDISABLE |
| 47 | #endif |
| 48 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 49 | #ifndef _NSIG |
| 50 | # ifdef NSIG |
| 51 | # define _NSIG NSIG |
| 52 | # else |
| 53 | # define _NSIG 128 |
| 54 | # endif |
| 55 | #endif |
| 56 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 57 | static volatile sig_atomic_t signo[_NSIG]; |
| 58 | |
| 59 | static void handler(int); |
| 60 | |
| 61 | char * |
| 62 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
| 63 | { |
| 64 | ssize_t nr; |
| 65 | int input, output, save_errno, i, need_restart; |
| 66 | char ch, *p, *end; |
| 67 | struct termios term, oterm; |
| 68 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
| 69 | struct sigaction savetstp, savettin, savettou, savepipe; |
| 70 | |
| 71 | /* I suppose we could alloc on demand in this case (XXX). */ |
| 72 | if (bufsiz == 0) { |
| 73 | errno = EINVAL; |
| 74 | return(NULL); |
| 75 | } |
| 76 | |
| 77 | restart: |
| 78 | for (i = 0; i < _NSIG; i++) |
| 79 | signo[i] = 0; |
| 80 | nr = -1; |
| 81 | save_errno = 0; |
| 82 | need_restart = 0; |
| 83 | /* |
| 84 | * Read and write to /dev/tty if available. If not, read from |
| 85 | * stdin and write to stderr unless a tty is required. |
| 86 | */ |
| 87 | if ((flags & RPP_STDIN) || |
| 88 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { |
| 89 | if (flags & RPP_REQUIRE_TTY) { |
| 90 | errno = ENOTTY; |
| 91 | return(NULL); |
| 92 | } |
| 93 | input = STDIN_FILENO; |
| 94 | output = STDERR_FILENO; |
| 95 | } |
| 96 | |
| 97 | /* |
| 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. |
| 101 | */ |
| 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); |
| 114 | |
| 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); |
| 120 | #ifdef VSTATUS |
| 121 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) |
| 122 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
| 123 | #endif |
| 124 | (void)tcsetattr(input, _T_FLUSH, &term); |
| 125 | } else { |
| 126 | memset(&term, 0, sizeof(term)); |
| 127 | term.c_lflag |= ECHO; |
| 128 | memset(&oterm, 0, sizeof(oterm)); |
| 129 | oterm.c_lflag |= ECHO; |
| 130 | } |
| 131 | |
| 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; |
| 137 | p = buf; |
| 138 | while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { |
| 139 | if (p < end) { |
| 140 | if ((flags & RPP_SEVENBIT)) |
| 141 | ch &= 0x7f; |
| 142 | if (isalpha(ch)) { |
| 143 | if ((flags & RPP_FORCELOWER)) |
| 144 | ch = (char)tolower(ch); |
| 145 | if ((flags & RPP_FORCEUPPER)) |
| 146 | ch = (char)toupper(ch); |
| 147 | } |
| 148 | *p++ = ch; |
| 149 | } |
| 150 | } |
| 151 | *p = '\0'; |
| 152 | save_errno = errno; |
| 153 | if (!(term.c_lflag & ECHO)) |
| 154 | (void)write(output, "\n", 1); |
| 155 | } |
| 156 | |
| 157 | /* Restore old terminal settings and signals. */ |
| 158 | if (memcmp(&term, &oterm, sizeof(term)) != 0) { |
| 159 | while (tcsetattr(input, _T_FLUSH, &oterm) == -1 && |
| 160 | errno == EINTR) |
| 161 | continue; |
| 162 | } |
| 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) |
| 173 | (void)close(input); |
| 174 | |
| 175 | /* |
| 176 | * If we were interrupted by a signal, resend it to ourselves |
| 177 | * now that we have restored the signal handlers. |
| 178 | */ |
| 179 | for (i = 0; i < _NSIG; i++) { |
| 180 | if (signo[i]) { |
| 181 | kill(getpid(), i); |
| 182 | switch (i) { |
| 183 | case SIGTSTP: |
| 184 | case SIGTTIN: |
| 185 | case SIGTTOU: |
| 186 | need_restart = 1; |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | if (need_restart) |
| 191 | goto restart; |
| 192 | |
| 193 | if (save_errno) |
| 194 | errno = save_errno; |
| 195 | return(nr == -1 ? NULL : buf); |
| 196 | } |
| 197 | |
| 198 | #if 0 |
| 199 | char * |
| 200 | getpass(const char *prompt) |
| 201 | { |
| 202 | static char buf[_PASSWORD_LEN + 1]; |
| 203 | |
| 204 | return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); |
| 205 | } |
| 206 | #endif |
| 207 | |
| 208 | static void handler(int s) |
| 209 | { |
| 210 | |
| 211 | signo[s] = 1; |
| 212 | } |
| 213 | #endif /* HAVE_READPASSPHRASE */ |