contrib/libarchive/libarchive_fe/passphrase.c

   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