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annotate compat/readpassphrase.c @ 0:a7e41e1a79c8

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Initial revision
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Thu, 19 Jan 2017 22:39:51 +0100
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1 /* $OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt 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 #include <ctype.h>
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25 #include <errno.h>
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26 #include <fcntl.h>
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27 #ifdef HAVE_PATHS_H
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28 #include <paths.h>
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29 #endif /* HAVE_PATHS_H */
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30 #include <pwd.h>
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31 #include <signal.h>
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32 #include <string.h>
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33 #include <termios.h>
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34 #include <unistd.h>
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35 #include "readpassphrase.h"
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36
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37 #ifndef TCSASOFT
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38 #define TCSASOFT 0
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39 #endif /* !TCSASOFT */
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40
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41 #ifndef _NSIG
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42 #ifdef NSIG
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43 #define _NSIG NSIG
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44 #else /* NSIG */
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45 #define _NSIG 128
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46 #endif /* NSIG */
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47 #endif /* !_NSIG */
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48
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49 #ifndef _PATH_TTY
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50 #define _PATH_TTY "/dev/tty"
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51 #endif
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52
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53 static volatile sig_atomic_t signo[_NSIG];
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54
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55 static void handler(int);
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56
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57 char *
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58 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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59 {
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60 ssize_t nr;
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61 int input, output, save_errno, i, need_restart;
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62 char ch, *p, *end;
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63 struct termios term, oterm;
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64 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
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65 struct sigaction savetstp, savettin, savettou, savepipe;
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66
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67 /* I suppose we could alloc on demand in this case (XXX). */
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68 if (bufsiz == 0) {
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69 errno = EINVAL;
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70 return(NULL);
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71 }
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72
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73 restart:
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74 for (i = 0; i < _NSIG; i++)
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75 signo[i] = 0;
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76 nr = -1;
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77 save_errno = 0;
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78 need_restart = 0;
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79 /*
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80 * Read and write to /dev/tty if available. If not, read from
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81 * stdin and write to stderr unless a tty is required.
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82 */
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83 if ((flags & RPP_STDIN) ||
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84 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
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85 if (flags & RPP_REQUIRE_TTY) {
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86 errno = ENOTTY;
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87 return(NULL);
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88 }
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89 input = STDIN_FILENO;
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90 output = STDERR_FILENO;
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91 }
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92
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93 /*
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94 * Turn off echo if possible.
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95 * If we are using a tty but are not the foreground pgrp this will
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96 * generate SIGTTOU, so do it *before* installing the signal handlers.
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97 */
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98 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
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99 memcpy(&term, &oterm, sizeof(term));
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100 if (!(flags & RPP_ECHO_ON))
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101 term.c_lflag &= ~(ECHO | ECHONL);
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102 #ifdef VSTATUS
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103 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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104 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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105 #endif /* VSTATUS */
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106 (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
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107 } else {
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108 memset(&term, 0, sizeof(term));
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109 term.c_lflag |= ECHO;
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110 memset(&oterm, 0, sizeof(oterm));
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111 oterm.c_lflag |= ECHO;
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112 }
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113
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114 /*
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115 * Catch signals that would otherwise cause the user to end
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116 * up with echo turned off in the shell. Don't worry about
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117 * things like SIGXCPU and SIGVTALRM for now.
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118 */
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119 sigemptyset(&sa.sa_mask);
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120 sa.sa_flags = 0; /* don't restart system calls */
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121 sa.sa_handler = handler;
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122 (void)sigaction(SIGALRM, &sa, &savealrm);
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123 (void)sigaction(SIGHUP, &sa, &savehup);
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124 (void)sigaction(SIGINT, &sa, &saveint);
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125 (void)sigaction(SIGPIPE, &sa, &savepipe);
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126 (void)sigaction(SIGQUIT, &sa, &savequit);
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127 (void)sigaction(SIGTERM, &sa, &saveterm);
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128 (void)sigaction(SIGTSTP, &sa, &savetstp);
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129 (void)sigaction(SIGTTIN, &sa, &savettin);
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130 (void)sigaction(SIGTTOU, &sa, &savettou);
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131
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132 if (!(flags & RPP_STDIN))
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133 (void)write(output, prompt, strlen(prompt));
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134 end = buf + bufsiz - 1;
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135 p = buf;
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136 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
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137 if (p < end) {
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138 if ((flags & RPP_SEVENBIT))
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139 ch &= 0x7f;
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140 if (isalpha((unsigned char)ch)) {
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141 if ((flags & RPP_FORCELOWER))
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142 ch = (char)tolower((unsigned char)ch);
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143 if ((flags & RPP_FORCEUPPER))
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144 ch = (char)toupper((unsigned char)ch);
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145 }
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146 *p++ = ch;
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147 }
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148 }
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149 *p = '\0';
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150 save_errno = errno;
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151 if (!(term.c_lflag & ECHO))
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152 (void)write(output, "\n", 1);
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153
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154 /* Restore old terminal settings and signals. */
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155 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
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156 while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
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157 errno == EINTR && !signo[SIGTTOU])
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158 continue;
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159 }
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160 (void)sigaction(SIGALRM, &savealrm, NULL);
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161 (void)sigaction(SIGHUP, &savehup, NULL);
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162 (void)sigaction(SIGINT, &saveint, NULL);
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163 (void)sigaction(SIGQUIT, &savequit, NULL);
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164 (void)sigaction(SIGPIPE, &savepipe, NULL);
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165 (void)sigaction(SIGTERM, &saveterm, NULL);
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166 (void)sigaction(SIGTSTP, &savetstp, NULL);
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167 (void)sigaction(SIGTTIN, &savettin, NULL);
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168 (void)sigaction(SIGTTOU, &savettou, NULL);
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169 if (input != STDIN_FILENO)
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170 (void)close(input);
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171
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172 /*
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173 * If we were interrupted by a signal, resend it to ourselves
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174 * now that we have restored the signal handlers.
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175 */
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176 for (i = 0; i < _NSIG; i++) {
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177 if (signo[i]) {
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178 kill(getpid(), i);
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179 switch (i) {
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180 case SIGTSTP:
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181 case SIGTTIN:
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182 case SIGTTOU:
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183 need_restart = 1;
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184 }
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185 }
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186 }
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187 if (need_restart)
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188 goto restart;
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189
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190 if (save_errno)
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191 errno = save_errno;
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192 return(nr == -1 ? NULL : buf);
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193 }
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194
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195 #if 0
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196 char *
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197 getpass(const char *prompt)
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198 {
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199 static char buf[_PASSWORD_LEN + 1];
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200
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201 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
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202 }
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203 #endif
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204
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205 static void handler(int s)
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206 {
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207
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208 signo[s] = 1;
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209 }