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 * 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 <termios.h> 125 #include <signal.h> 126 #include <ctype.h> 127 #include <fcntl.h> 128 #ifdef HAVE_PATHS_H 129 #include <paths.h> 130 #endif 131 #include <string.h> 132 #include <unistd.h> 133 134 #ifdef TCSASOFT 135 # define _T_FLUSH (TCSAFLUSH|TCSASOFT) 136 #else 137 # define _T_FLUSH (TCSAFLUSH) 138 #endif 139 140 /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ 141 #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) 142 # define _POSIX_VDISABLE VDISABLE 143 #endif 144 145 static volatile sig_atomic_t *signo; 146 147 static void 148 handler(int s) 149 { 150 signo[s] = 1; 151 } 152 153 static char * 154 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) 155 { 156 ssize_t nr; 157 int input, output, save_errno, i, need_restart; 158 char ch, *p, *end; 159 struct termios term, oterm; 160 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; 161 struct sigaction savetstp, savettin, savettou, savepipe; 162 163 /* I suppose we could alloc on demand in this case (XXX). */ 164 if (bufsiz == 0) { 165 errno = EINVAL; 166 return(NULL); 167 } 168 169 if (signo == NULL) { 170 signo = calloc(SIGRTMAX, sizeof(sig_atomic_t)); 171 } 172 173 restart: 174 for (i = 0; i < SIGRTMAX; i++) 175 signo[i] = 0; 176 nr = -1; 177 save_errno = 0; 178 need_restart = 0; 179 /* 180 * Read and write to /dev/tty if available. If not, read from 181 * stdin and write to stderr unless a tty is required. 182 */ 183 if ((flags & RPP_STDIN) || 184 (input = output = open(_PATH_TTY, O_RDWR)) == -1) { 185 if (flags & RPP_REQUIRE_TTY) { 186 errno = ENOTTY; 187 return(NULL); 188 } 189 input = STDIN_FILENO; 190 output = STDERR_FILENO; 191 } 192 193 /* 194 * Catch signals that would otherwise cause the user to end 195 * up with echo turned off in the shell. Don't worry about 196 * things like SIGXCPU and SIGVTALRM for now. 197 */ 198 sigemptyset(&sa.sa_mask); 199 sa.sa_flags = 0; /* don't restart system calls */ 200 sa.sa_handler = handler; 201 (void)sigaction(SIGALRM, &sa, &savealrm); 202 (void)sigaction(SIGHUP, &sa, &savehup); 203 (void)sigaction(SIGINT, &sa, &saveint); 204 (void)sigaction(SIGPIPE, &sa, &savepipe); 205 (void)sigaction(SIGQUIT, &sa, &savequit); 206 (void)sigaction(SIGTERM, &sa, &saveterm); 207 (void)sigaction(SIGTSTP, &sa, &savetstp); 208 (void)sigaction(SIGTTIN, &sa, &savettin); 209 (void)sigaction(SIGTTOU, &sa, &savettou); 210 211 /* Turn off echo if possible. */ 212 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { 213 memcpy(&term, &oterm, sizeof(term)); 214 if (!(flags & RPP_ECHO_ON)) 215 term.c_lflag &= ~(ECHO | ECHONL); 216 #ifdef VSTATUS 217 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) 218 term.c_cc[VSTATUS] = _POSIX_VDISABLE; 219 #endif 220 (void)tcsetattr(input, _T_FLUSH, &term); 221 } else { 222 memset(&term, 0, sizeof(term)); 223 term.c_lflag |= ECHO; 224 memset(&oterm, 0, sizeof(oterm)); 225 oterm.c_lflag |= ECHO; 226 } 227 228 /* No I/O if we are already backgrounded. */ 229 if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) { 230 if (!(flags & RPP_STDIN)) { 231 int r = write(output, prompt, strlen(prompt)); 232 (void)r; 233 } 234 end = buf + bufsiz - 1; 235 p = buf; 236 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { 237 if (p < end) { 238 if ((flags & RPP_SEVENBIT)) 239 ch &= 0x7f; 240 if (isalpha(ch)) { 241 if ((flags & RPP_FORCELOWER)) 242 ch = (char)tolower(ch); 243 if ((flags & RPP_FORCEUPPER)) 244 ch = (char)toupper(ch); 245 } 246 *p++ = ch; 247 } 248 } 249 *p = '\0'; 250 save_errno = errno; 251 if (!(term.c_lflag & ECHO)) { 252 int r = write(output, "\n", 1); 253 (void)r; 254 } 255 } 256 257 /* Restore old terminal settings and signals. */ 258 if (memcmp(&term, &oterm, sizeof(term)) != 0) { 259 while (tcsetattr(input, _T_FLUSH, &oterm) == -1 && 260 errno == EINTR) 261 continue; 262 } 263 (void)sigaction(SIGALRM, &savealrm, NULL); 264 (void)sigaction(SIGHUP, &savehup, NULL); 265 (void)sigaction(SIGINT, &saveint, NULL); 266 (void)sigaction(SIGQUIT, &savequit, NULL); 267 (void)sigaction(SIGPIPE, &savepipe, NULL); 268 (void)sigaction(SIGTERM, &saveterm, NULL); 269 (void)sigaction(SIGTSTP, &savetstp, NULL); 270 (void)sigaction(SIGTTIN, &savettin, NULL); 271 (void)sigaction(SIGTTOU, &savettou, NULL); 272 if (input != STDIN_FILENO) 273 (void)close(input); 274 275 /* 276 * If we were interrupted by a signal, resend it to ourselves 277 * now that we have restored the signal handlers. 278 */ 279 for (i = 0; i < SIGRTMAX; i++) { 280 if (signo[i]) { 281 kill(getpid(), i); 282 switch (i) { 283 case SIGTSTP: 284 case SIGTTIN: 285 case SIGTTOU: 286 need_restart = 1; 287 } 288 } 289 } 290 if (need_restart) 291 goto restart; 292 293 if (save_errno) 294 errno = save_errno; 295 return(nr == -1 ? NULL : buf); 296 } 297 #endif /* _WIN32 && !__CYGWIN__ */ 298 #endif /* HAVE_READPASSPHRASE */ 299 300 char * 301 lafe_readpassphrase(const char *prompt, char *buf, size_t bufsiz) 302 { 303 char *p; 304 305 p = readpassphrase(prompt, buf, bufsiz, RPP_ECHO_OFF); 306 if (p == NULL) { 307 switch (errno) { 308 case EINTR: 309 break; 310 default: 311 lafe_errc(1, errno, "Couldn't read passphrase"); 312 break; 313 } 314 } 315 return (p); 316 } 317 318