/* $NetBSD: readpassphrase.c,v 1.1.1.1 2001/09/27 02:01:02 itojun Exp $ */ /* * Copyright (c) 2000 Todd C. Miller * 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. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``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 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. */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.7 2001/08/07 19:34:11 millert Exp $"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include #include #include #include #include #include char * readpassphrase(prompt, buf, bufsiz, flags) const char *prompt; char *buf; size_t bufsiz; int flags; { struct termios term, oterm; char ch, *p, *end; int input, output; sigset_t oset, nset; /* I suppose we could alloc on demand in this case (XXX). */ if (bufsiz == 0) { errno = EINVAL; return(NULL); } /* * Read and write to /dev/tty if available. If not, read from * stdin and write to stderr unless a tty is required. */ if ((input = output = open(_PATH_TTY, O_RDWR)) == -1) { if (flags & RPP_REQUIRE_TTY) { errno = ENOTTY; return(NULL); } input = STDIN_FILENO; output = STDERR_FILENO; } /* * We block SIGINT and SIGTSTP so the terminal is not left * in an inconsistent state (ie: no echo). It would probably * be better to simply catch these though. */ sigemptyset(&nset); sigaddset(&nset, SIGINT); sigaddset(&nset, SIGTSTP); (void)sigprocmask(SIG_BLOCK, &nset, &oset); /* Turn off echo if possible. */ if (tcgetattr(input, &oterm) == 0) { memcpy(&term, &oterm, sizeof(term)); if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO)) term.c_lflag &= ~ECHO; if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) term.c_cc[VSTATUS] = _POSIX_VDISABLE; (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term); } else { memset(&term, 0, sizeof(term)); memset(&oterm, 0, sizeof(oterm)); } (void)write(output, prompt, strlen(prompt)); end = buf + bufsiz - 1; for (p = buf; read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) { if (p < end) { if ((flags & RPP_SEVENBIT)) ch &= 0x7f; if (isalpha(ch)) { if ((flags & RPP_FORCELOWER)) ch = tolower(ch); if ((flags & RPP_FORCEUPPER)) ch = toupper(ch); } *p++ = ch; } } *p = '\0'; if (!(term.c_lflag & ECHO)) (void)write(output, "\n", 1); /* Restore old terminal settings and signal mask. */ if (memcmp(&term, &oterm, sizeof(term)) != 0) (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm); (void)sigprocmask(SIG_SETMASK, &oset, NULL); if (input != STDIN_FILENO) (void)close(input); return(buf); } char * getpass(prompt) const char *prompt; { static char buf[_PASSWORD_LEN + 1]; return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); }