/*-
* Copyright (c) 2014 Michihiro NAKAJIMA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer
*    in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*      $OpenBSD: readpassphrase.c,v 1.27 2019/01/25 00:19:25 millert Exp $     */

/*
* Copyright (c) 2000-2002, 2007, 2010
*      Todd C. Miller <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/

/* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */


#include "lafe_platform.h"
#include <errno.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_READPASSPHRASE_H
#include <readpassphrase.h>
#endif

#include "err.h"
#include "passphrase.h"

#ifndef HAVE_READPASSPHRASE

#define RPP_ECHO_OFF    0x00            /* Turn off echo (default). */
#define RPP_ECHO_ON     0x01            /* Leave echo on. */
#define RPP_REQUIRE_TTY 0x02            /* Fail if there is no tty. */
#define RPP_FORCELOWER  0x04            /* Force input to lower case. */
#define RPP_FORCEUPPER  0x08            /* Force input to upper case. */
#define RPP_SEVENBIT    0x10            /* Strip the high bit from input. */
#define RPP_STDIN       0x20            /* Read from stdin, not /dev/tty */


#if defined(_WIN32) && !defined(__CYGWIN__)
#include <string.h>
#include <windows.h>

static char *
readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
       HANDLE hStdin, hStdout;
       DWORD mode, rbytes;
       BOOL success;

       (void)flags;

       hStdin = GetStdHandle(STD_INPUT_HANDLE);
       if (hStdin == INVALID_HANDLE_VALUE)
               return (NULL);
       hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
       if (hStdout == INVALID_HANDLE_VALUE)
               return (NULL);

       success = GetConsoleMode(hStdin, &mode);
       if (!success)
               return (NULL);
       mode &= ~ENABLE_ECHO_INPUT;
       mode |= ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT;
       success = SetConsoleMode(hStdin, mode);
       if (!success)
               return (NULL);

       success = WriteFile(hStdout, prompt, (DWORD)strlen(prompt),
               NULL, NULL);
       if (!success)
               return (NULL);
       success = ReadFile(hStdin, buf, (DWORD)bufsiz - 1, &rbytes, NULL);
       if (!success)
               return (NULL);
       WriteFile(hStdout, "\r\n", 2, NULL, NULL);
       buf[rbytes] = '\0';
       /* Remove trailing carriage return(s). */
       buf[strcspn(buf, "\r\n")] = '\0';

       return (buf);
}

#else /* _WIN32 && !__CYGWIN__ */

#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#include <signal.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#ifndef _PATH_TTY
#define _PATH_TTY "/dev/tty"
#endif

#ifdef TCSASOFT
# define _T_FLUSH       (TCSAFLUSH|TCSASOFT)
#else
# define _T_FLUSH       (TCSAFLUSH)
#endif

/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
#  define _POSIX_VDISABLE       VDISABLE
#endif

#define M(a,b) (a > b ? a : b)
#define MAX_SIGNO M(M(M(SIGALRM, SIGHUP), \
                     M(SIGINT, SIGPIPE)), \
                   M(M(SIGQUIT, SIGTERM), \
                     M(M(SIGTSTP, SIGTTIN), SIGTTOU)))

static volatile sig_atomic_t signo[MAX_SIGNO + 1];

static void
handler(int s)
{
       assert(s <= MAX_SIGNO);
       signo[s] = 1;
}

static char *
readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
       ssize_t nr;
       int input, output, save_errno, i, need_restart;
       char ch, *p, *end;
       struct termios term, oterm;
#ifdef HAVE_SIGACTION
       struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
       struct sigaction savetstp, savettin, savettou, savepipe;
#endif

       /* I suppose we could alloc on demand in this case (XXX). */
       if (bufsiz == 0) {
               errno = EINVAL;
               return(NULL);
       }

restart:
       for (i = 0; i <= MAX_SIGNO; i++)
               signo[i] = 0;
       nr = -1;
       save_errno = 0;
       need_restart = 0;
       /*
        * Read and write to /dev/tty if available.  If not, read from
        * stdin and write to stderr unless a tty is required.
        */
       if ((flags & RPP_STDIN) ||
           (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
               if (flags & RPP_REQUIRE_TTY) {
                       errno = ENOTTY;
                       return(NULL);
               }
               input = STDIN_FILENO;
               output = STDERR_FILENO;
       }

       /*
        * Turn off echo if possible.
        * If we are using a tty but are not the foreground pgrp this will
        * generate SIGTTOU, so do it *before* installing the signal handlers.
        */
       if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
               memcpy(&term, &oterm, sizeof(term));
               if (!(flags & RPP_ECHO_ON))
                       term.c_lflag &= ~(ECHO | ECHONL);
#ifdef VSTATUS
               if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
                       term.c_cc[VSTATUS] = _POSIX_VDISABLE;
#endif
               (void)tcsetattr(input, _T_FLUSH, &term);
       } else {
               memset(&term, 0, sizeof(term));
               term.c_lflag |= ECHO;
               memset(&oterm, 0, sizeof(oterm));
               oterm.c_lflag |= ECHO;
       }

#ifdef HAVE_SIGACTION
       /*
        * Catch signals that would otherwise cause the user to end
        * up with echo turned off in the shell.  Don't worry about
        * things like SIGXCPU and SIGVTALRM for now.
        */
       sigemptyset(&sa.sa_mask);
       sa.sa_flags = 0;                /* don't restart system calls */
       sa.sa_handler = handler;
       /* Keep this list in sync with MAX_SIGNO! */
       (void)sigaction(SIGALRM, &sa, &savealrm);
       (void)sigaction(SIGHUP, &sa, &savehup);
       (void)sigaction(SIGINT, &sa, &saveint);
       (void)sigaction(SIGPIPE, &sa, &savepipe);
       (void)sigaction(SIGQUIT, &sa, &savequit);
       (void)sigaction(SIGTERM, &sa, &saveterm);
       (void)sigaction(SIGTSTP, &sa, &savetstp);
       (void)sigaction(SIGTTIN, &sa, &savettin);
       (void)sigaction(SIGTTOU, &sa, &savettou);
#endif

       if (!(flags & RPP_STDIN)) {
               int r = write(output, prompt, strlen(prompt));
               (void)r;
       }
       end = buf + bufsiz - 1;
       p = buf;
       while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
               if (p < end) {
                       if ((flags & RPP_SEVENBIT))
                               ch &= 0x7f;
                       if (isalpha((unsigned char)ch)) {
                               if ((flags & RPP_FORCELOWER))
                                       ch = (char)tolower((unsigned char)ch);
                               if ((flags & RPP_FORCEUPPER))
                                       ch = (char)toupper((unsigned char)ch);
                       }
                       *p++ = ch;
               }
       }
       *p = '\0';
       save_errno = errno;
       if (!(term.c_lflag & ECHO)) {
               int r = write(output, "\n", 1);
               (void)r;
       }

       /* Restore old terminal settings and signals. */
       if (memcmp(&term, &oterm, sizeof(term)) != 0) {
               const int sigttou = signo[SIGTTOU];

               /* Ignore SIGTTOU generated when we are not the fg pgrp. */
               while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
                   errno == EINTR && !signo[SIGTTOU])
                       continue;
               signo[SIGTTOU] = sigttou;
       }
#ifdef HAVE_SIGACTION
       (void)sigaction(SIGALRM, &savealrm, NULL);
       (void)sigaction(SIGHUP, &savehup, NULL);
       (void)sigaction(SIGINT, &saveint, NULL);
       (void)sigaction(SIGQUIT, &savequit, NULL);
       (void)sigaction(SIGPIPE, &savepipe, NULL);
       (void)sigaction(SIGTERM, &saveterm, NULL);
       (void)sigaction(SIGTSTP, &savetstp, NULL);
       (void)sigaction(SIGTTIN, &savettin, NULL);
       (void)sigaction(SIGTTOU, &savettou, NULL);
#endif
       if (input != STDIN_FILENO)
               (void)close(input);

       /*
        * If we were interrupted by a signal, resend it to ourselves
        * now that we have restored the signal handlers.
        */
       for (i = 0; i <= MAX_SIGNO; i++) {
               if (signo[i]) {
                       kill(getpid(), i);
                       switch (i) {
                       case SIGTSTP:
                       case SIGTTIN:
                       case SIGTTOU:
                               need_restart = 1;
                       }
               }
       }
       if (need_restart)
               goto restart;

       if (save_errno)
               errno = save_errno;
       return(nr == -1 ? NULL : buf);
}
#endif /* _WIN32 && !__CYGWIN__ */
#endif /* HAVE_READPASSPHRASE */

char *
lafe_readpassphrase(const char *prompt, char *buf, size_t bufsiz)
{
       char *p;

       p = readpassphrase(prompt, buf, bufsiz, RPP_ECHO_OFF);
       if (p == NULL) {
               switch (errno) {
               case EINTR:
                       break;
               default:
                       lafe_errc(1, errno, "Couldn't read passphrase");
                       /* NOTREACHED */
               }
       }
       return (p);
}

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