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annotate compat/readpassphrase.c @ 11:96a507a110c8

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Add support for format 0x030E
author Guido Berhoerster <guido+libpws@berhoerster.name>
date Fri, 02 Aug 2019 14:47:43 +0200
parents 97097b4b6bfb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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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
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36 #include "pws-compat.h"
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37 #include "readpassphrase.h"
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38
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39 #ifndef TCSASOFT
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40 #define TCSASOFT 0
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41 #endif /* !TCSASOFT */
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42
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43 #ifndef _NSIG
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44 #ifdef NSIG
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45 #define _NSIG NSIG
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46 #else /* NSIG */
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47 #define _NSIG 128
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48 #endif /* NSIG */
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49 #endif /* !_NSIG */
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50
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51 #ifndef _PATH_TTY
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52 #define _PATH_TTY "/dev/tty"
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53 #endif
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54
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55 static volatile sig_atomic_t signo[_NSIG];
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56
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57 static void handler(int);
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58
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59 char *
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60 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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61 {
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62 ssize_t nr;
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63 int input, output, save_errno, i, need_restart;
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64 char ch, *p, *end;
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65 struct termios term, oterm;
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66 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
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67 struct sigaction savetstp, savettin, savettou, savepipe;
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68
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69 /* I suppose we could alloc on demand in this case (XXX). */
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70 if (bufsiz == 0) {
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71 errno = EINVAL;
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72 return(NULL);
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73 }
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74
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75 restart:
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76 for (i = 0; i < _NSIG; i++)
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77 signo[i] = 0;
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78 nr = -1;
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79 save_errno = 0;
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80 need_restart = 0;
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81 /*
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82 * Read and write to /dev/tty if available. If not, read from
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83 * stdin and write to stderr unless a tty is required.
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84 */
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85 if ((flags & RPP_STDIN) ||
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86 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
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87 if (flags & RPP_REQUIRE_TTY) {
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88 errno = ENOTTY;
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89 return(NULL);
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90 }
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91 input = STDIN_FILENO;
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92 output = STDERR_FILENO;
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93 }
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94
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95 /*
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96 * Turn off echo if possible.
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97 * If we are using a tty but are not the foreground pgrp this will
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98 * generate SIGTTOU, so do it *before* installing the signal handlers.
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99 */
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100 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
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101 memcpy(&term, &oterm, sizeof(term));
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102 if (!(flags & RPP_ECHO_ON))
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103 term.c_lflag &= ~(ECHO | ECHONL);
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104 #ifdef VSTATUS
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105 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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106 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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107 #endif /* VSTATUS */
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108 (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
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109 } else {
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110 memset(&term, 0, sizeof(term));
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111 term.c_lflag |= ECHO;
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112 memset(&oterm, 0, sizeof(oterm));
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113 oterm.c_lflag |= ECHO;
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114 }
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115
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116 /*
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117 * Catch signals that would otherwise cause the user to end
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118 * up with echo turned off in the shell. Don't worry about
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119 * things like SIGXCPU and SIGVTALRM for now.
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120 */
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121 sigemptyset(&sa.sa_mask);
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122 sa.sa_flags = 0; /* don't restart system calls */
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123 sa.sa_handler = handler;
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124 (void)sigaction(SIGALRM, &sa, &savealrm);
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125 (void)sigaction(SIGHUP, &sa, &savehup);
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126 (void)sigaction(SIGINT, &sa, &saveint);
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127 (void)sigaction(SIGPIPE, &sa, &savepipe);
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128 (void)sigaction(SIGQUIT, &sa, &savequit);
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129 (void)sigaction(SIGTERM, &sa, &saveterm);
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130 (void)sigaction(SIGTSTP, &sa, &savetstp);
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131 (void)sigaction(SIGTTIN, &sa, &savettin);
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132 (void)sigaction(SIGTTOU, &sa, &savettou);
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133
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
134 if (!(flags & RPP_STDIN))
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
135 (void)write(output, prompt, strlen(prompt));
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
136 end = buf + bufsiz - 1;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
137 p = buf;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
138 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
139 if (p < end) {
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
140 if ((flags & RPP_SEVENBIT))
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
141 ch &= 0x7f;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
142 if (isalpha((unsigned char)ch)) {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
143 if ((flags & RPP_FORCELOWER))
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
144 ch = (char)tolower((unsigned char)ch);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
145 if ((flags & RPP_FORCEUPPER))
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
146 ch = (char)toupper((unsigned char)ch);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
147 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
148 *p++ = ch;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
149 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
150 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
151 *p = '\0';
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
152 save_errno = errno;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
153 if (!(term.c_lflag & ECHO))
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
154 (void)write(output, "\n", 1);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
155
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
156 /* Restore old terminal settings and signals. */
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
157 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
158 while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
159 errno == EINTR && !signo[SIGTTOU])
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
160 continue;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
161 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
162 (void)sigaction(SIGALRM, &savealrm, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
163 (void)sigaction(SIGHUP, &savehup, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
164 (void)sigaction(SIGINT, &saveint, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
165 (void)sigaction(SIGQUIT, &savequit, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
166 (void)sigaction(SIGPIPE, &savepipe, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
167 (void)sigaction(SIGTERM, &saveterm, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
168 (void)sigaction(SIGTSTP, &savetstp, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
169 (void)sigaction(SIGTTIN, &savettin, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
170 (void)sigaction(SIGTTOU, &savettou, NULL);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
171 if (input != STDIN_FILENO)
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
172 (void)close(input);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
173
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
174 /*
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Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
175 * If we were interrupted by a signal, resend it to ourselves
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
176 * now that we have restored the signal handlers.
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
177 */
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
178 for (i = 0; i < _NSIG; i++) {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
179 if (signo[i]) {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
180 kill(getpid(), i);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
181 switch (i) {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
182 case SIGTSTP:
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
183 case SIGTTIN:
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
184 case SIGTTOU:
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
185 need_restart = 1;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
186 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
187 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
188 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
189 if (need_restart)
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
190 goto restart;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
191
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
192 if (save_errno)
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
193 errno = save_errno;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
194 return(nr == -1 ? NULL : buf);
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
195 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
196
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
197 #if 0
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
198 char *
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
199 getpass(const char *prompt)
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
200 {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
201 static char buf[_PASSWORD_LEN + 1];
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
202
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
203 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
204 }
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
205 #endif
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
206
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
207 static void handler(int s)
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
208 {
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
209
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
210 signo[s] = 1;
97097b4b6bfb Add pwsdump utility
Guido Berhoerster <guido+libpws@berhoerster.name>
parents:
diff changeset
211 }