[2579c1a] | 1 | /* $OpenBSD: readpassphrase.c,v 1.23 2010/05/14 13:30:34 millert Exp $ */ |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (c) 2000-2002, 2007, 2010 |
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| 5 | * Todd C. Miller <Todd.Miller@courtesan.com> |
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| 6 | * |
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| 7 | * Permission to use, copy, modify, and distribute this software for any |
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| 8 | * purpose with or without fee is hereby granted, provided that the above |
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| 9 | * copyright notice and this permission notice appear in all copies. |
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| 10 | * |
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| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 18 | * |
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| 19 | * Sponsored in part by the Defense Advanced Research Projects |
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| 20 | * Agency (DARPA) and Air Force Research Laboratory, Air Force |
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| 21 | * Materiel Command, USAF, under agreement number F39502-99-1-0512. |
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| 22 | */ |
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| 23 | |
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| 24 | /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */ |
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| 25 | |
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| 26 | /** |
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| 27 | * Tom Carroll <thomas.carroll@pnnl.gov> |
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| 28 | * |
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| 29 | * Properly handled tcsetattr and SIGTTOU |
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| 30 | */ |
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| 31 | |
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| 32 | #ifndef HAVE_READPASSPHRASE |
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| 33 | |
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| 34 | #include <ctype.h> |
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| 35 | #include <errno.h> |
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| 36 | #include <fcntl.h> |
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| 37 | #ifdef HAVE_PATHS_H |
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| 38 | # include <paths.h> |
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| 39 | #endif |
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| 40 | #include <signal.h> |
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| 41 | #include <string.h> |
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| 42 | #include <termios.h> |
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| 43 | #include <unistd.h> |
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| 44 | #include "compat/readpassphrase.h" |
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| 45 | |
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| 46 | #ifndef TCSASOFT |
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| 47 | # define TCSASOFT 0 |
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| 48 | #endif |
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| 49 | |
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| 50 | #ifndef NSIG |
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| 51 | # ifdef _NSIG |
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| 52 | # define NSIG _NSIG |
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| 53 | # else |
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| 54 | # define NSIG 128 |
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| 55 | # endif |
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| 56 | #endif |
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| 57 | |
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| 58 | static volatile sig_atomic_t signo[NSIG]; |
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| 59 | |
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| 60 | static void handler(int); |
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| 61 | |
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| 62 | char * |
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| 63 | readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
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| 64 | { |
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| 65 | ssize_t nr; |
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| 66 | int input, output, save_errno, i, need_restart; |
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| 67 | char ch, *p, *end; |
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| 68 | struct termios term, oterm; |
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| 69 | struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
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| 70 | struct sigaction savetstp, savettin, savettou, savepipe; |
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| 71 | |
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| 72 | /* I suppose we could alloc on demand in this case (XXX). */ |
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| 73 | if (bufsiz == 0) { |
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| 74 | errno = EINVAL; |
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| 75 | return(NULL); |
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| 76 | } |
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| 77 | |
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| 78 | restart: |
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| 79 | for (i = 0; i < NSIG; i++) |
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| 80 | signo[i] = 0; |
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| 81 | nr = -1; |
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| 82 | save_errno = 0; |
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| 83 | need_restart = 0; |
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| 84 | /* |
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| 85 | * Read and write to /dev/tty if available. If not, read from |
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| 86 | * stdin and write to stderr unless a tty is required. |
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| 87 | */ |
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| 88 | if ((flags & RPP_STDIN) || |
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| 89 | (input = output = open(_PATH_TTY, O_RDWR)) == -1) { |
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| 90 | if (flags & RPP_REQUIRE_TTY) { |
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| 91 | errno = ENOTTY; |
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| 92 | return(NULL); |
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| 93 | } |
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| 94 | input = STDIN_FILENO; |
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| 95 | output = STDERR_FILENO; |
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| 96 | } |
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| 97 | |
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| 98 | /* |
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| 99 | * Turn off echo if possible. |
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| 100 | * If we are using a tty but are not the foreground pgrp this will |
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| 101 | * generate SIGTTOU, so do it *before* installing the signal handlers. |
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| 102 | */ |
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| 103 | if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { |
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| 104 | memcpy(&term, &oterm, sizeof(term)); |
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| 105 | if (!(flags & RPP_ECHO_ON)) |
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| 106 | term.c_lflag &= ~(ECHO | ECHONL); |
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| 107 | #ifdef VSTATUS |
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| 108 | if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) |
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| 109 | term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
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| 110 | #endif |
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| 111 | (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term); |
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| 112 | } else { |
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| 113 | memset(&term, 0, sizeof(term)); |
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| 114 | term.c_lflag |= ECHO; |
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| 115 | memset(&oterm, 0, sizeof(oterm)); |
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| 116 | oterm.c_lflag |= ECHO; |
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| 117 | } |
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| 118 | |
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| 119 | /* |
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| 120 | * Catch signals that would otherwise cause the user to end |
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| 121 | * up with echo turned off in the shell. Don't worry about |
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| 122 | * things like SIGXCPU and SIGVTALRM for now. |
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| 123 | */ |
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| 124 | sigemptyset(&sa.sa_mask); |
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| 125 | sa.sa_flags = 0; /* don't restart system calls */ |
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| 126 | sa.sa_handler = handler; |
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| 127 | (void)sigaction(SIGALRM, &sa, &savealrm); |
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| 128 | (void)sigaction(SIGHUP, &sa, &savehup); |
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| 129 | (void)sigaction(SIGINT, &sa, &saveint); |
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| 130 | (void)sigaction(SIGPIPE, &sa, &savepipe); |
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| 131 | (void)sigaction(SIGQUIT, &sa, &savequit); |
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| 132 | (void)sigaction(SIGTERM, &sa, &saveterm); |
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| 133 | (void)sigaction(SIGTSTP, &sa, &savetstp); |
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| 134 | (void)sigaction(SIGTTIN, &sa, &savettin); |
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| 135 | (void)sigaction(SIGTTOU, &sa, &savettou); |
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| 136 | |
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| 137 | if (!(flags & RPP_STDIN)) |
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| 138 | (void)write(output, prompt, strlen(prompt)); |
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| 139 | end = buf + bufsiz - 1; |
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| 140 | p = buf; |
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| 141 | while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { |
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| 142 | if (p < end) { |
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| 143 | if ((flags & RPP_SEVENBIT)) |
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| 144 | ch &= 0x7f; |
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| 145 | if (isalpha(ch)) { |
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| 146 | if ((flags & RPP_FORCELOWER)) |
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| 147 | ch = (char)tolower(ch); |
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| 148 | if ((flags & RPP_FORCEUPPER)) |
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| 149 | ch = (char)toupper(ch); |
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| 150 | } |
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| 151 | *p++ = ch; |
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| 152 | } |
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| 153 | } |
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| 154 | *p = '\0'; |
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| 155 | save_errno = errno; |
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| 156 | if (!(term.c_lflag & ECHO)) |
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| 157 | (void)write(output, "\n", 1); |
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| 158 | |
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| 159 | /* Restore old terminal settings and signals. */ |
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| 160 | if (memcmp(&term, &oterm, sizeof(term)) != 0) { |
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| 161 | sigset_t ttou_sigset, old_sigset; |
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| 162 | sigemptyset(&ttou_sigset); |
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| 163 | sigaddset(&ttou_sigset, SIGTTOU); |
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| 164 | sigprocmask(SIG_BLOCK, &ttou_sigset, &old_sigset); |
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| 165 | while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 && |
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| 166 | errno == EINTR) |
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| 167 | continue; |
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| 168 | sigprocmask(SIG_SETMASK, &old_sigset, NULL); |
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| 169 | } |
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| 170 | (void)sigaction(SIGALRM, &savealrm, NULL); |
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| 171 | (void)sigaction(SIGHUP, &savehup, NULL); |
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| 172 | (void)sigaction(SIGINT, &saveint, NULL); |
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| 173 | (void)sigaction(SIGQUIT, &savequit, NULL); |
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| 174 | (void)sigaction(SIGPIPE, &savepipe, NULL); |
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| 175 | (void)sigaction(SIGTERM, &saveterm, NULL); |
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| 176 | (void)sigaction(SIGTSTP, &savetstp, NULL); |
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| 177 | (void)sigaction(SIGTTIN, &savettin, NULL); |
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| 178 | (void)sigaction(SIGTTOU, &savettou, NULL); |
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| 179 | if (input != STDIN_FILENO) |
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| 180 | (void)close(input); |
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| 181 | |
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| 182 | /* |
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| 183 | * If we were interrupted by a signal, resend it to ourselves |
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| 184 | * now that we have restored the signal handlers. |
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| 185 | */ |
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| 186 | for (i = 0; i < NSIG; i++) { |
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| 187 | if (signo[i]) { |
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| 188 | kill(getpid(), i); |
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| 189 | switch (i) { |
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| 190 | case SIGTSTP: |
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| 191 | case SIGTTIN: |
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| 192 | case SIGTTOU: |
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| 193 | need_restart = 1; |
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| 194 | } |
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| 195 | } |
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| 196 | } |
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| 197 | if (need_restart) |
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| 198 | goto restart; |
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| 199 | |
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| 200 | return(nr == -1 ? errno = save_errno, NULL : buf); |
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| 201 | } |
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| 202 | |
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| 203 | static void handler(int s) |
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| 204 | { |
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| 205 | |
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| 206 | signo[s] = 1; |
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| 207 | } |
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| 208 | |
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| 209 | #endif /* ! HAVE_READPASSPHRASE */ |
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