1 /*-
2 * Copyright (c) 2014 Michihiro NAKAJIMA
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 /* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */
27 /*
28 * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
29 *
30 * Permission to use, copy, modify, and distribute this software for any
31 * purpose with or without fee is hereby granted, provided that the above
32 * copyright notice and this permission notice appear in all copies.
33 *
34 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
35 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
36 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
37 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
38 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
39 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
40 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
41 *
42 * Sponsored in part by the Defense Advanced Research Projects
43 * Agency (DARPA) and Air Force Research Laboratory, Air Force
44 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
45 */
46
47 /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
48
49
50 #include "lafe_platform.h"
51 __FBSDID("$FreeBSD$");
52
53 #include <errno.h>
54 #ifdef HAVE_STDLIB_H
55 #include <stdlib.h>
56 #endif
57 #ifdef HAVE_UNISTD_H
58 #include <unistd.h>
59 #endif
60 #ifdef HAVE_READPASSPHRASE_H
61 #include <readpassphrase.h>
62 #endif
63
64 #include "err.h"
65 #include "passphrase.h"
66
67 #ifndef HAVE_READPASSPHRASE
68
69 #define RPP_ECHO_OFF 0x00 /* Turn off echo (default). */
70 #define RPP_ECHO_ON 0x01 /* Leave echo on. */
71 #define RPP_REQUIRE_TTY 0x02 /* Fail if there is no tty. */
72 #define RPP_FORCELOWER 0x04 /* Force input to lower case. */
73 #define RPP_FORCEUPPER 0x08 /* Force input to upper case. */
74 #define RPP_SEVENBIT 0x10 /* Strip the high bit from input. */
75 #define RPP_STDIN 0x20 /* Read from stdin, not /dev/tty */
76
77
78 #if defined(_WIN32) && !defined(__CYGWIN__)
79 #include <windows.h>
80
81 static char *
readpassphrase(const char * prompt,char * buf,size_t bufsiz,int flags)82 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
83 {
84 HANDLE hStdin, hStdout;
85 DWORD mode, rbytes;
86 BOOL success;
87
88 (void)flags;
89
90 hStdin = GetStdHandle(STD_INPUT_HANDLE);
91 if (hStdin == INVALID_HANDLE_VALUE)
92 return (NULL);
93 hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
94 if (hStdout == INVALID_HANDLE_VALUE)
95 return (NULL);
96
97 success = GetConsoleMode(hStdin, &mode);
98 if (!success)
99 return (NULL);
100 mode &= ~ENABLE_ECHO_INPUT;
101 mode |= ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT;
102 success = SetConsoleMode(hStdin, mode);
103 if (!success)
104 return (NULL);
105
106 success = WriteFile(hStdout, prompt, (DWORD)strlen(prompt),
107 NULL, NULL);
108 if (!success)
109 return (NULL);
110 success = ReadFile(hStdin, buf, (DWORD)bufsiz - 1, &rbytes, NULL);
111 if (!success)
112 return (NULL);
113 WriteFile(hStdout, "\r\n", 2, NULL, NULL);
114 buf[rbytes] = '\0';
115 /* Remove trailing carriage return(s). */
116 if (rbytes > 2 && buf[rbytes - 2] == '\r' && buf[rbytes - 1] == '\n')
117 buf[rbytes - 2] = '\0';
118
119 return (buf);
120 }
121
122 #else /* _WIN32 && !__CYGWIN__ */
123
124 #include <assert.h>
125 #include <ctype.h>
126 #include <fcntl.h>
127 #ifdef HAVE_PATHS_H
128 #include <paths.h>
129 #endif
130 #include <signal.h>
131 #include <string.h>
132 #include <termios.h>
133 #include <unistd.h>
134
135 #ifndef _PATH_TTY
136 #define _PATH_TTY "/dev/tty"
137 #endif
138
139 #ifdef TCSASOFT
140 # define _T_FLUSH (TCSAFLUSH|TCSASOFT)
141 #else
142 # define _T_FLUSH (TCSAFLUSH)
143 #endif
144
145 /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
146 #if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
147 # define _POSIX_VDISABLE VDISABLE
148 #endif
149
150 #define M(a,b) (a > b ? a : b)
151 #define MAX_SIGNO M(M(M(SIGALRM, SIGHUP), \
152 M(SIGINT, SIGPIPE)), \
153 M(M(SIGQUIT, SIGTERM), \
154 M(M(SIGTSTP, SIGTTIN), SIGTTOU)))
155
156 static volatile sig_atomic_t signo[MAX_SIGNO + 1];
157
158 static void
handler(int s)159 handler(int s)
160 {
161 assert(s <= MAX_SIGNO);
162 signo[s] = 1;
163 }
164
165 static char *
readpassphrase(const char * prompt,char * buf,size_t bufsiz,int flags)166 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
167 {
168 ssize_t nr;
169 int input, output, save_errno, i, need_restart;
170 char ch, *p, *end;
171 struct termios term, oterm;
172 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
173 struct sigaction savetstp, savettin, savettou, savepipe;
174
175 /* I suppose we could alloc on demand in this case (XXX). */
176 if (bufsiz == 0) {
177 errno = EINVAL;
178 return(NULL);
179 }
180
181 restart:
182 for (i = 0; i <= MAX_SIGNO; i++)
183 signo[i] = 0;
184 nr = -1;
185 save_errno = 0;
186 need_restart = 0;
187 /*
188 * Read and write to /dev/tty if available. If not, read from
189 * stdin and write to stderr unless a tty is required.
190 */
191 if ((flags & RPP_STDIN) ||
192 (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
193 if (flags & RPP_REQUIRE_TTY) {
194 errno = ENOTTY;
195 return(NULL);
196 }
197 input = STDIN_FILENO;
198 output = STDERR_FILENO;
199 }
200
201 /*
202 * Catch signals that would otherwise cause the user to end
203 * up with echo turned off in the shell. Don't worry about
204 * things like SIGXCPU and SIGVTALRM for now.
205 */
206 sigemptyset(&sa.sa_mask);
207 sa.sa_flags = 0; /* don't restart system calls */
208 sa.sa_handler = handler;
209 /* Keep this list in sync with MAX_SIGNO! */
210 (void)sigaction(SIGALRM, &sa, &savealrm);
211 (void)sigaction(SIGHUP, &sa, &savehup);
212 (void)sigaction(SIGINT, &sa, &saveint);
213 (void)sigaction(SIGPIPE, &sa, &savepipe);
214 (void)sigaction(SIGQUIT, &sa, &savequit);
215 (void)sigaction(SIGTERM, &sa, &saveterm);
216 (void)sigaction(SIGTSTP, &sa, &savetstp);
217 (void)sigaction(SIGTTIN, &sa, &savettin);
218 (void)sigaction(SIGTTOU, &sa, &savettou);
219
220 /* Turn off echo if possible. */
221 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
222 memcpy(&term, &oterm, sizeof(term));
223 if (!(flags & RPP_ECHO_ON))
224 term.c_lflag &= ~(ECHO | ECHONL);
225 #ifdef VSTATUS
226 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
227 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
228 #endif
229 (void)tcsetattr(input, _T_FLUSH, &term);
230 } else {
231 memset(&term, 0, sizeof(term));
232 term.c_lflag |= ECHO;
233 memset(&oterm, 0, sizeof(oterm));
234 oterm.c_lflag |= ECHO;
235 }
236
237 /* No I/O if we are already backgrounded. */
238 if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) {
239 if (!(flags & RPP_STDIN)) {
240 int r = write(output, prompt, strlen(prompt));
241 (void)r;
242 }
243 end = buf + bufsiz - 1;
244 p = buf;
245 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
246 if (p < end) {
247 if ((flags & RPP_SEVENBIT))
248 ch &= 0x7f;
249 if (isalpha((unsigned char)ch)) {
250 if ((flags & RPP_FORCELOWER))
251 ch = (char)tolower((unsigned char)ch);
252 if ((flags & RPP_FORCEUPPER))
253 ch = (char)toupper((unsigned char)ch);
254 }
255 *p++ = ch;
256 }
257 }
258 *p = '\0';
259 save_errno = errno;
260 if (!(term.c_lflag & ECHO)) {
261 int r = write(output, "\n", 1);
262 (void)r;
263 }
264 }
265
266 /* Restore old terminal settings and signals. */
267 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
268 while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
269 errno == EINTR)
270 continue;
271 }
272 (void)sigaction(SIGALRM, &savealrm, NULL);
273 (void)sigaction(SIGHUP, &savehup, NULL);
274 (void)sigaction(SIGINT, &saveint, NULL);
275 (void)sigaction(SIGQUIT, &savequit, NULL);
276 (void)sigaction(SIGPIPE, &savepipe, NULL);
277 (void)sigaction(SIGTERM, &saveterm, NULL);
278 (void)sigaction(SIGTSTP, &savetstp, NULL);
279 (void)sigaction(SIGTTIN, &savettin, NULL);
280 (void)sigaction(SIGTTOU, &savettou, NULL);
281 if (input != STDIN_FILENO)
282 (void)close(input);
283
284 /*
285 * If we were interrupted by a signal, resend it to ourselves
286 * now that we have restored the signal handlers.
287 */
288 for (i = 0; i <= MAX_SIGNO; i++) {
289 if (signo[i]) {
290 kill(getpid(), i);
291 switch (i) {
292 case SIGTSTP:
293 case SIGTTIN:
294 case SIGTTOU:
295 need_restart = 1;
296 }
297 }
298 }
299 if (need_restart)
300 goto restart;
301
302 if (save_errno)
303 errno = save_errno;
304 return(nr == -1 ? NULL : buf);
305 }
306 #endif /* _WIN32 && !__CYGWIN__ */
307 #endif /* HAVE_READPASSPHRASE */
308
309 char *
lafe_readpassphrase(const char * prompt,char * buf,size_t bufsiz)310 lafe_readpassphrase(const char *prompt, char *buf, size_t bufsiz)
311 {
312 char *p;
313
314 p = readpassphrase(prompt, buf, bufsiz, RPP_ECHO_OFF);
315 if (p == NULL) {
316 switch (errno) {
317 case EINTR:
318 break;
319 default:
320 lafe_errc(1, errno, "Couldn't read passphrase");
321 break;
322 }
323 }
324 return (p);
325 }
326
327