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comparison 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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-1:000000000000 0:a7e41e1a79c8
1 /* $OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 2000-2002, 2007, 2010
5 * Todd C. Miller <Todd.Miller@courtesan.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 *
19 * Sponsored in part by the Defense Advanced Research Projects
20 * Agency (DARPA) and Air Force Research Laboratory, Air Force
21 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
22 */
23
24 #include <ctype.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #ifdef HAVE_PATHS_H
28 #include <paths.h>
29 #endif /* HAVE_PATHS_H */
30 #include <pwd.h>
31 #include <signal.h>
32 #include <string.h>
33 #include <termios.h>
34 #include <unistd.h>
35 #include "readpassphrase.h"
36
37 #ifndef TCSASOFT
38 #define TCSASOFT 0
39 #endif /* !TCSASOFT */
40
41 #ifndef _NSIG
42 #ifdef NSIG
43 #define _NSIG NSIG
44 #else /* NSIG */
45 #define _NSIG 128
46 #endif /* NSIG */
47 #endif /* !_NSIG */
48
49 #ifndef _PATH_TTY
50 #define _PATH_TTY "/dev/tty"
51 #endif
52
53 static volatile sig_atomic_t signo[_NSIG];
54
55 static void handler(int);
56
57 char *
58 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
59 {
60 ssize_t nr;
61 int input, output, save_errno, i, need_restart;
62 char ch, *p, *end;
63 struct termios term, oterm;
64 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
65 struct sigaction savetstp, savettin, savettou, savepipe;
66
67 /* I suppose we could alloc on demand in this case (XXX). */
68 if (bufsiz == 0) {
69 errno = EINVAL;
70 return(NULL);
71 }
72
73 restart:
74 for (i = 0; i < _NSIG; i++)
75 signo[i] = 0;
76 nr = -1;
77 save_errno = 0;
78 need_restart = 0;
79 /*
80 * Read and write to /dev/tty if available. If not, read from
81 * stdin and write to stderr unless a tty is required.
82 */
83 if ((flags & RPP_STDIN) ||
84 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
85 if (flags & RPP_REQUIRE_TTY) {
86 errno = ENOTTY;
87 return(NULL);
88 }
89 input = STDIN_FILENO;
90 output = STDERR_FILENO;
91 }
92
93 /*
94 * Turn off echo if possible.
95 * If we are using a tty but are not the foreground pgrp this will
96 * generate SIGTTOU, so do it *before* installing the signal handlers.
97 */
98 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
99 memcpy(&term, &oterm, sizeof(term));
100 if (!(flags & RPP_ECHO_ON))
101 term.c_lflag &= ~(ECHO | ECHONL);
102 #ifdef VSTATUS
103 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
104 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
105 #endif /* VSTATUS */
106 (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
107 } else {
108 memset(&term, 0, sizeof(term));
109 term.c_lflag |= ECHO;
110 memset(&oterm, 0, sizeof(oterm));
111 oterm.c_lflag |= ECHO;
112 }
113
114 /*
115 * Catch signals that would otherwise cause the user to end
116 * up with echo turned off in the shell. Don't worry about
117 * things like SIGXCPU and SIGVTALRM for now.
118 */
119 sigemptyset(&sa.sa_mask);
120 sa.sa_flags = 0; /* don't restart system calls */
121 sa.sa_handler = handler;
122 (void)sigaction(SIGALRM, &sa, &savealrm);
123 (void)sigaction(SIGHUP, &sa, &savehup);
124 (void)sigaction(SIGINT, &sa, &saveint);
125 (void)sigaction(SIGPIPE, &sa, &savepipe);
126 (void)sigaction(SIGQUIT, &sa, &savequit);
127 (void)sigaction(SIGTERM, &sa, &saveterm);
128 (void)sigaction(SIGTSTP, &sa, &savetstp);
129 (void)sigaction(SIGTTIN, &sa, &savettin);
130 (void)sigaction(SIGTTOU, &sa, &savettou);
131
132 if (!(flags & RPP_STDIN))
133 (void)write(output, prompt, strlen(prompt));
134 end = buf + bufsiz - 1;
135 p = buf;
136 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
137 if (p < end) {
138 if ((flags & RPP_SEVENBIT))
139 ch &= 0x7f;
140 if (isalpha((unsigned char)ch)) {
141 if ((flags & RPP_FORCELOWER))
142 ch = (char)tolower((unsigned char)ch);
143 if ((flags & RPP_FORCEUPPER))
144 ch = (char)toupper((unsigned char)ch);
145 }
146 *p++ = ch;
147 }
148 }
149 *p = '\0';
150 save_errno = errno;
151 if (!(term.c_lflag & ECHO))
152 (void)write(output, "\n", 1);
153
154 /* Restore old terminal settings and signals. */
155 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
156 while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
157 errno == EINTR && !signo[SIGTTOU])
158 continue;
159 }
160 (void)sigaction(SIGALRM, &savealrm, NULL);
161 (void)sigaction(SIGHUP, &savehup, NULL);
162 (void)sigaction(SIGINT, &saveint, NULL);
163 (void)sigaction(SIGQUIT, &savequit, NULL);
164 (void)sigaction(SIGPIPE, &savepipe, NULL);
165 (void)sigaction(SIGTERM, &saveterm, NULL);
166 (void)sigaction(SIGTSTP, &savetstp, NULL);
167 (void)sigaction(SIGTTIN, &savettin, NULL);
168 (void)sigaction(SIGTTOU, &savettou, NULL);
169 if (input != STDIN_FILENO)
170 (void)close(input);
171
172 /*
173 * If we were interrupted by a signal, resend it to ourselves
174 * now that we have restored the signal handlers.
175 */
176 for (i = 0; i < _NSIG; i++) {
177 if (signo[i]) {
178 kill(getpid(), i);
179 switch (i) {
180 case SIGTSTP:
181 case SIGTTIN:
182 case SIGTTOU:
183 need_restart = 1;
184 }
185 }
186 }
187 if (need_restart)
188 goto restart;
189
190 if (save_errno)
191 errno = save_errno;
192 return(nr == -1 ? NULL : buf);
193 }
194
195 #if 0
196 char *
197 getpass(const char *prompt)
198 {
199 static char buf[_PASSWORD_LEN + 1];
200
201 return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
202 }
203 #endif
204
205 static void handler(int s)
206 {
207
208 signo[s] = 1;
209 }