1*0Sstevel@tonic-gate /* $OpenBSD: readpassphrase.c,v 1.14 2002/06/28 01:43:58 millert Exp $ */ 2*0Sstevel@tonic-gate 3*0Sstevel@tonic-gate /* 4*0Sstevel@tonic-gate * Copyright (c) 2000-2002 Todd C. Miller <Todd.Miller@courtesan.com> 5*0Sstevel@tonic-gate * All rights reserved. 6*0Sstevel@tonic-gate * 7*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 8*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 9*0Sstevel@tonic-gate * are met: 10*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 11*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 12*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 14*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 15*0Sstevel@tonic-gate * 3. The name of the author may not be used to endorse or promote products 16*0Sstevel@tonic-gate * derived from this software without specific prior written permission. 17*0Sstevel@tonic-gate * 18*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19*0Sstevel@tonic-gate * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20*0Sstevel@tonic-gate * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21*0Sstevel@tonic-gate * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22*0Sstevel@tonic-gate * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23*0Sstevel@tonic-gate * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24*0Sstevel@tonic-gate * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25*0Sstevel@tonic-gate * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26*0Sstevel@tonic-gate * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27*0Sstevel@tonic-gate * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28*0Sstevel@tonic-gate */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint) 31*0Sstevel@tonic-gate static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.14 2002/06/28 01:43:58 millert Exp $"; 32*0Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */ 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate #include "includes.h" 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate #ifndef HAVE_READPASSPHRASE 37*0Sstevel@tonic-gate 38*0Sstevel@tonic-gate #include <termios.h> 39*0Sstevel@tonic-gate #include <readpassphrase.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #ifdef TCSASOFT 42*0Sstevel@tonic-gate # define _T_FLUSH (TCSAFLUSH|TCSASOFT) 43*0Sstevel@tonic-gate #else 44*0Sstevel@tonic-gate # define _T_FLUSH (TCSAFLUSH) 45*0Sstevel@tonic-gate #endif 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ 48*0Sstevel@tonic-gate #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) 49*0Sstevel@tonic-gate # define _POSIX_VDISABLE VDISABLE 50*0Sstevel@tonic-gate #endif 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate static volatile sig_atomic_t signo; 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate static void handler(int); 55*0Sstevel@tonic-gate 56*0Sstevel@tonic-gate char * 57*0Sstevel@tonic-gate readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) 58*0Sstevel@tonic-gate { 59*0Sstevel@tonic-gate ssize_t nr; 60*0Sstevel@tonic-gate int input, output, save_errno; 61*0Sstevel@tonic-gate char ch, *p, *end; 62*0Sstevel@tonic-gate struct termios term, oterm; 63*0Sstevel@tonic-gate struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; 64*0Sstevel@tonic-gate struct sigaction savetstp, savettin, savettou, savepipe; 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate /* I suppose we could alloc on demand in this case (XXX). */ 67*0Sstevel@tonic-gate if (bufsiz == 0) { 68*0Sstevel@tonic-gate errno = EINVAL; 69*0Sstevel@tonic-gate return(NULL); 70*0Sstevel@tonic-gate } 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate restart: 73*0Sstevel@tonic-gate signo = 0; 74*0Sstevel@tonic-gate /* 75*0Sstevel@tonic-gate * Read and write to /dev/tty if available. If not, read from 76*0Sstevel@tonic-gate * stdin and write to stderr unless a tty is required. 77*0Sstevel@tonic-gate */ 78*0Sstevel@tonic-gate if ((flags & RPP_STDIN) || 79*0Sstevel@tonic-gate (input = output = open(_PATH_TTY, O_RDWR)) == -1) { 80*0Sstevel@tonic-gate if (flags & RPP_REQUIRE_TTY) { 81*0Sstevel@tonic-gate errno = ENOTTY; 82*0Sstevel@tonic-gate return(NULL); 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate input = STDIN_FILENO; 85*0Sstevel@tonic-gate output = STDERR_FILENO; 86*0Sstevel@tonic-gate } 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate /* 89*0Sstevel@tonic-gate * Catch signals that would otherwise cause the user to end 90*0Sstevel@tonic-gate * up with echo turned off in the shell. Don't worry about 91*0Sstevel@tonic-gate * things like SIGXCPU and SIGVTALRM for now. 92*0Sstevel@tonic-gate */ 93*0Sstevel@tonic-gate sigemptyset(&sa.sa_mask); 94*0Sstevel@tonic-gate sa.sa_flags = 0; /* don't restart system calls */ 95*0Sstevel@tonic-gate sa.sa_handler = handler; 96*0Sstevel@tonic-gate (void)sigaction(SIGALRM, &sa, &savealrm); 97*0Sstevel@tonic-gate (void)sigaction(SIGHUP, &sa, &savehup); 98*0Sstevel@tonic-gate (void)sigaction(SIGINT, &sa, &saveint); 99*0Sstevel@tonic-gate (void)sigaction(SIGPIPE, &sa, &savepipe); 100*0Sstevel@tonic-gate (void)sigaction(SIGQUIT, &sa, &savequit); 101*0Sstevel@tonic-gate (void)sigaction(SIGTERM, &sa, &saveterm); 102*0Sstevel@tonic-gate (void)sigaction(SIGTSTP, &sa, &savetstp); 103*0Sstevel@tonic-gate (void)sigaction(SIGTTIN, &sa, &savettin); 104*0Sstevel@tonic-gate (void)sigaction(SIGTTOU, &sa, &savettou); 105*0Sstevel@tonic-gate 106*0Sstevel@tonic-gate /* Turn off echo if possible. */ 107*0Sstevel@tonic-gate if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { 108*0Sstevel@tonic-gate memcpy(&term, &oterm, sizeof(term)); 109*0Sstevel@tonic-gate if (!(flags & RPP_ECHO_ON)) 110*0Sstevel@tonic-gate term.c_lflag &= ~(ECHO | ECHONL); 111*0Sstevel@tonic-gate #ifdef VSTATUS 112*0Sstevel@tonic-gate if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) 113*0Sstevel@tonic-gate term.c_cc[VSTATUS] = _POSIX_VDISABLE; 114*0Sstevel@tonic-gate #endif 115*0Sstevel@tonic-gate (void)tcsetattr(input, _T_FLUSH, &term); 116*0Sstevel@tonic-gate } else { 117*0Sstevel@tonic-gate memset(&term, 0, sizeof(term)); 118*0Sstevel@tonic-gate term.c_lflag |= ECHO; 119*0Sstevel@tonic-gate memset(&oterm, 0, sizeof(oterm)); 120*0Sstevel@tonic-gate oterm.c_lflag |= ECHO; 121*0Sstevel@tonic-gate } 122*0Sstevel@tonic-gate 123*0Sstevel@tonic-gate if (!(flags & RPP_STDIN)) 124*0Sstevel@tonic-gate (void)write(output, prompt, strlen(prompt)); 125*0Sstevel@tonic-gate end = buf + bufsiz - 1; 126*0Sstevel@tonic-gate for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) { 127*0Sstevel@tonic-gate if (p < end) { 128*0Sstevel@tonic-gate if ((flags & RPP_SEVENBIT)) 129*0Sstevel@tonic-gate ch &= 0x7f; 130*0Sstevel@tonic-gate if (isalpha(ch)) { 131*0Sstevel@tonic-gate if ((flags & RPP_FORCELOWER)) 132*0Sstevel@tonic-gate ch = tolower(ch); 133*0Sstevel@tonic-gate if ((flags & RPP_FORCEUPPER)) 134*0Sstevel@tonic-gate ch = toupper(ch); 135*0Sstevel@tonic-gate } 136*0Sstevel@tonic-gate *p++ = ch; 137*0Sstevel@tonic-gate } 138*0Sstevel@tonic-gate } 139*0Sstevel@tonic-gate *p = '\0'; 140*0Sstevel@tonic-gate save_errno = errno; 141*0Sstevel@tonic-gate if (!(term.c_lflag & ECHO)) 142*0Sstevel@tonic-gate (void)write(output, "\n", 1); 143*0Sstevel@tonic-gate 144*0Sstevel@tonic-gate /* Restore old terminal settings and signals. */ 145*0Sstevel@tonic-gate if (memcmp(&term, &oterm, sizeof(term)) != 0) 146*0Sstevel@tonic-gate (void)tcsetattr(input, _T_FLUSH, &oterm); 147*0Sstevel@tonic-gate (void)sigaction(SIGALRM, &savealrm, NULL); 148*0Sstevel@tonic-gate (void)sigaction(SIGHUP, &savehup, NULL); 149*0Sstevel@tonic-gate (void)sigaction(SIGINT, &saveint, NULL); 150*0Sstevel@tonic-gate (void)sigaction(SIGQUIT, &savequit, NULL); 151*0Sstevel@tonic-gate (void)sigaction(SIGPIPE, &savepipe, NULL); 152*0Sstevel@tonic-gate (void)sigaction(SIGTERM, &saveterm, NULL); 153*0Sstevel@tonic-gate (void)sigaction(SIGTSTP, &savetstp, NULL); 154*0Sstevel@tonic-gate (void)sigaction(SIGTTIN, &savettin, NULL); 155*0Sstevel@tonic-gate if (input != STDIN_FILENO) 156*0Sstevel@tonic-gate (void)close(input); 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate /* 159*0Sstevel@tonic-gate * If we were interrupted by a signal, resend it to ourselves 160*0Sstevel@tonic-gate * now that we have restored the signal handlers. 161*0Sstevel@tonic-gate */ 162*0Sstevel@tonic-gate if (signo) { 163*0Sstevel@tonic-gate kill(getpid(), signo); 164*0Sstevel@tonic-gate switch (signo) { 165*0Sstevel@tonic-gate case SIGTSTP: 166*0Sstevel@tonic-gate case SIGTTIN: 167*0Sstevel@tonic-gate case SIGTTOU: 168*0Sstevel@tonic-gate goto restart; 169*0Sstevel@tonic-gate } 170*0Sstevel@tonic-gate } 171*0Sstevel@tonic-gate 172*0Sstevel@tonic-gate errno = save_errno; 173*0Sstevel@tonic-gate return(nr == -1 ? NULL : buf); 174*0Sstevel@tonic-gate } 175*0Sstevel@tonic-gate 176*0Sstevel@tonic-gate #if 0 177*0Sstevel@tonic-gate char * 178*0Sstevel@tonic-gate getpass(const char *prompt) 179*0Sstevel@tonic-gate { 180*0Sstevel@tonic-gate static char buf[_PASSWORD_LEN + 1]; 181*0Sstevel@tonic-gate 182*0Sstevel@tonic-gate return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); 183*0Sstevel@tonic-gate } 184*0Sstevel@tonic-gate #endif 185*0Sstevel@tonic-gate 186*0Sstevel@tonic-gate static void handler(int s) 187*0Sstevel@tonic-gate { 188*0Sstevel@tonic-gate signo = s; 189*0Sstevel@tonic-gate } 190*0Sstevel@tonic-gate #endif /* HAVE_READPASSPHRASE */ 191*0Sstevel@tonic-gate 192*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 193