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Annotation of src/usr.bin/ssh/readpass.c, Revision 1.11

1.1       deraadt     1: /*
1.8       deraadt     2:  * Copyright (c) 1988, 1993
                      3:  *      The Regents of the University of California.  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:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *      This product includes software developed by the University of
                     16:  *      California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
1.6       deraadt    32:  */
1.1       deraadt    33:
                     34: #include "includes.h"
1.11    ! markus     35: RCSID("$OpenBSD: readpass.c,v 1.10 2000/04/14 10:30:32 markus Exp $");
1.1       deraadt    36:
                     37: #include "xmalloc.h"
                     38: #include "ssh.h"
                     39:
1.9       deraadt    40: volatile int intr;
                     41:
                     42: void
                     43: intcatch()
                     44: {
                     45:        intr = 1;
                     46: }
                     47:
1.7       markus     48: /*
                     49:  * Reads a passphrase from /dev/tty with echo turned off.  Returns the
1.8       deraadt    50:  * passphrase (allocated with xmalloc), being very careful to ensure that
                     51:  * no other userland buffer is storing the password.
1.7       markus     52:  */
1.5       markus     53: char *
                     54: read_passphrase(const char *prompt, int from_stdin)
1.1       deraadt    55: {
1.8       deraadt    56:        char buf[1024], *p, ch;
                     57:        struct termios tio, saved_tio;
                     58:        sigset_t oset, nset;
1.9       deraadt    59:        struct sigaction sa, osa;
1.8       deraadt    60:        int input, output, echo = 0;
1.10      markus     61:
1.8       deraadt    62:        if (from_stdin) {
                     63:                input = STDIN_FILENO;
                     64:                output = STDERR_FILENO;
                     65:        } else
                     66:                input = output = open("/dev/tty", O_RDWR);
                     67:
                     68:        if (input == -1)
                     69:                fatal("You have no controlling tty.  Cannot read passphrase.\n");
                     70:
                     71:        /* block signals, get terminal modes and turn off echo */
                     72:        sigemptyset(&nset);
                     73:        sigaddset(&nset, SIGTSTP);
                     74:        (void) sigprocmask(SIG_BLOCK, &nset, &oset);
1.9       deraadt    75:        memset(&sa, 0, sizeof(sa));
                     76:        sa.sa_handler = intcatch;
                     77:        (void) sigaction(SIGINT, &sa, &osa);
                     78:
                     79:        intr = 0;
1.8       deraadt    80:
1.9       deraadt    81:        if (tcgetattr(input, &saved_tio) == 0 && (saved_tio.c_lflag & ECHO)) {
1.8       deraadt    82:                echo = 1;
1.9       deraadt    83:                tio = saved_tio;
1.8       deraadt    84:                tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
                     85:                (void) tcsetattr(input, TCSANOW, &tio);
1.1       deraadt    86:        }
                     87:
1.5       markus     88:        fflush(stdout);
                     89:
1.8       deraadt    90:        (void)write(output, prompt, strlen(prompt));
1.9       deraadt    91:        for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) {
                     92:                if (intr)
                     93:                        break;
1.8       deraadt    94:                if (p < buf + sizeof(buf) - 1)
                     95:                        *p++ = ch;
1.9       deraadt    96:        }
1.8       deraadt    97:        *p = '\0';
1.9       deraadt    98:        if (!intr)
                     99:                (void)write(output, "\n", 1);
1.8       deraadt   100:
                    101:        /* restore terminal modes and allow signals */
                    102:        if (echo)
                    103:                tcsetattr(input, TCSANOW, &saved_tio);
                    104:        (void) sigprocmask(SIG_SETMASK, &oset, NULL);
1.9       deraadt   105:        (void) sigaction(SIGINT, &osa, NULL);
                    106:
                    107:        if (intr) {
                    108:                kill(getpid(), SIGINT);
                    109:                sigemptyset(&nset);
                    110:                /* XXX tty has not neccessarily drained by now? */
                    111:                sigsuspend(&nset);
                    112:        }
1.8       deraadt   113:
                    114:        if (!from_stdin)
                    115:                (void)close(input);
                    116:        p = xstrdup(buf);
1.5       markus    117:        memset(buf, 0, sizeof(buf));
1.8       deraadt   118:        return (p);
1.1       deraadt   119: }