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 <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 #ifdef TCSASOFT 136 # define _T_FLUSH (TCSAFLUSH|TCSASOFT) 137 #else 138 # define _T_FLUSH (TCSAFLUSH) 139 #endif 140 141 /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ 142 #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) 143 # define _POSIX_VDISABLE VDISABLE 144 #endif 145 146 #define M(a,b) (a > b ? a : b) 147 #define MAX_SIGNO M(M(M(SIGALRM, SIGHUP), \ 148 M(SIGINT, SIGPIPE)), \ 149 M(M(SIGQUIT, SIGTERM), \ 150 M(M(SIGTSTP, SIGTTIN), SIGTTOU))) 151 152 static volatile sig_atomic_t signo[MAX_SIGNO + 1]; 153 154 static void 155 handler(int s) 156 { 157 assert(s <= MAX_SIGNO); 158 signo[s] = 1; 159 } 160 161 static char * 162 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) 163 { 164 ssize_t nr; 165 int input, output, save_errno, i, need_restart; 166 char ch, *p, *end; 167 struct termios term, oterm; 168 struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; 169 struct sigaction savetstp, savettin, savettou, savepipe; 170 171 /* I suppose we could alloc on demand in this case (XXX). */ 172 if (bufsiz == 0) { 173 errno = EINVAL; 174 return(NULL); 175 } 176 177 restart: 178 for (i = 0; i <= MAX_SIGNO; i++) 179 signo[i] = 0; 180 nr = -1; 181 save_errno = 0; 182 need_restart = 0; 183 /* 184 * Read and write to /dev/tty if available. If not, read from 185 * stdin and write to stderr unless a tty is required. 186 */ 187 if ((flags & RPP_STDIN) || 188 (input = output = open(_PATH_TTY, O_RDWR)) == -1) { 189 if (flags & RPP_REQUIRE_TTY) { 190 errno = ENOTTY; 191 return(NULL); 192 } 193 input = STDIN_FILENO; 194 output = STDERR_FILENO; 195 } 196 197 /* 198 * Catch signals that would otherwise cause the user to end 199 * up with echo turned off in the shell. Don't worry about 200 * things like SIGXCPU and SIGVTALRM for now. 201 */ 202 sigemptyset(&sa.sa_mask); 203 sa.sa_flags = 0; /* don't restart system calls */ 204 sa.sa_handler = handler; 205 /* Keep this list in sync with MAX_SIGNO! */ 206 (void)sigaction(SIGALRM, &sa, &savealrm); 207 (void)sigaction(SIGHUP, &sa, &savehup); 208 (void)sigaction(SIGINT, &sa, &saveint); 209 (void)sigaction(SIGPIPE, &sa, &savepipe); 210 (void)sigaction(SIGQUIT, &sa, &savequit); 211 (void)sigaction(SIGTERM, &sa, &saveterm); 212 (void)sigaction(SIGTSTP, &sa, &savetstp); 213 (void)sigaction(SIGTTIN, &sa, &savettin); 214 (void)sigaction(SIGTTOU, &sa, &savettou); 215 216 /* Turn off echo if possible. */ 217 if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { 218 memcpy(&term, &oterm, sizeof(term)); 219 if (!(flags & RPP_ECHO_ON)) 220 term.c_lflag &= ~(ECHO | ECHONL); 221 #ifdef VSTATUS 222 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) 223 term.c_cc[VSTATUS] = _POSIX_VDISABLE; 224 #endif 225 (void)tcsetattr(input, _T_FLUSH, &term); 226 } else { 227 memset(&term, 0, sizeof(term)); 228 term.c_lflag |= ECHO; 229 memset(&oterm, 0, sizeof(oterm)); 230 oterm.c_lflag |= ECHO; 231 } 232 233 /* No I/O if we are already backgrounded. */ 234 if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) { 235 if (!(flags & RPP_STDIN)) { 236 int r = write(output, prompt, strlen(prompt)); 237 (void)r; 238 } 239 end = buf + bufsiz - 1; 240 p = buf; 241 while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { 242 if (p < end) { 243 if ((flags & RPP_SEVENBIT)) 244 ch &= 0x7f; 245 if (isalpha((unsigned char)ch)) { 246 if ((flags & RPP_FORCELOWER)) 247 ch = (char)tolower((unsigned char)ch); 248 if ((flags & RPP_FORCEUPPER)) 249 ch = (char)toupper((unsigned char)ch); 250 } 251 *p++ = ch; 252 } 253 } 254 *p = '\0'; 255 save_errno = errno; 256 if (!(term.c_lflag & ECHO)) { 257 int r = write(output, "\n", 1); 258 (void)r; 259 } 260 } 261 262 /* Restore old terminal settings and signals. */ 263 if (memcmp(&term, &oterm, sizeof(term)) != 0) { 264 while (tcsetattr(input, _T_FLUSH, &oterm) == -1 && 265 errno == EINTR) 266 continue; 267 } 268 (void)sigaction(SIGALRM, &savealrm, NULL); 269 (void)sigaction(SIGHUP, &savehup, NULL); 270 (void)sigaction(SIGINT, &saveint, NULL); 271 (void)sigaction(SIGQUIT, &savequit, NULL); 272 (void)sigaction(SIGPIPE, &savepipe, NULL); 273 (void)sigaction(SIGTERM, &saveterm, NULL); 274 (void)sigaction(SIGTSTP, &savetstp, NULL); 275 (void)sigaction(SIGTTIN, &savettin, NULL); 276 (void)sigaction(SIGTTOU, &savettou, NULL); 277 if (input != STDIN_FILENO) 278 (void)close(input); 279 280 /* 281 * If we were interrupted by a signal, resend it to ourselves 282 * now that we have restored the signal handlers. 283 */ 284 for (i = 0; i <= MAX_SIGNO; i++) { 285 if (signo[i]) { 286 kill(getpid(), i); 287 switch (i) { 288 case SIGTSTP: 289 case SIGTTIN: 290 case SIGTTOU: 291 need_restart = 1; 292 } 293 } 294 } 295 if (need_restart) 296 goto restart; 297 298 if (save_errno) 299 errno = save_errno; 300 return(nr == -1 ? NULL : buf); 301 } 302 #endif /* _WIN32 && !__CYGWIN__ */ 303 #endif /* HAVE_READPASSPHRASE */ 304 305 char * 306 lafe_readpassphrase(const char *prompt, char *buf, size_t bufsiz) 307 { 308 char *p; 309 310 p = readpassphrase(prompt, buf, bufsiz, RPP_ECHO_OFF); 311 if (p == NULL) { 312 switch (errno) { 313 case EINTR: 314 break; 315 default: 316 lafe_errc(1, errno, "Couldn't read passphrase"); 317 break; 318 } 319 } 320 return (p); 321 } 322 323