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Annotation of src/usr.bin/ssh/readpass.c, Revision 1.8

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"
1.8     ! deraadt    35: RCSID("$Id: readpass.c,v 1.5 1999/11/23 22:25:54 markus Exp $");
1.1       deraadt    36:
                     37: #include "xmalloc.h"
                     38: #include "ssh.h"
                     39:
1.7       markus     40: /*
                     41:  * Reads a passphrase from /dev/tty with echo turned off.  Returns the
1.8     ! deraadt    42:  * passphrase (allocated with xmalloc), being very careful to ensure that
        !            43:  * no other userland buffer is storing the password.
1.7       markus     44:  */
1.5       markus     45: char *
                     46: read_passphrase(const char *prompt, int from_stdin)
1.1       deraadt    47: {
1.8     ! deraadt    48:        char buf[1024], *p, ch;
        !            49:        struct termios tio, saved_tio;
        !            50:        sigset_t oset, nset;
        !            51:        int input, output, echo = 0;
        !            52:
        !            53:        if (from_stdin) {
        !            54:                input = STDIN_FILENO;
        !            55:                output = STDERR_FILENO;
        !            56:        } else
        !            57:                input = output = open("/dev/tty", O_RDWR);
        !            58:
        !            59:        if (input == -1)
        !            60:                fatal("You have no controlling tty.  Cannot read passphrase.\n");
        !            61:
        !            62:        /* block signals, get terminal modes and turn off echo */
        !            63:        sigemptyset(&nset);
        !            64:        sigaddset(&nset, SIGINT);
        !            65:        sigaddset(&nset, SIGTSTP);
        !            66:        (void) sigprocmask(SIG_BLOCK, &nset, &oset);
        !            67:
        !            68:        if (tcgetattr(input, &tio) == 0 && (tio.c_lflag & ECHO)) {
        !            69:                echo = 1;
        !            70:                saved_tio = tio;
        !            71:                tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
        !            72:                (void) tcsetattr(input, TCSANOW, &tio);
1.1       deraadt    73:        }
                     74:
1.5       markus     75:        fflush(stdout);
                     76:
1.8     ! deraadt    77:        (void)write(output, prompt, strlen(prompt));
        !            78:        for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';)
        !            79:                if (p < buf + sizeof(buf) - 1)
        !            80:                        *p++ = ch;
        !            81:        *p = '\0';
        !            82:        (void)write(output, "\n", 1);
        !            83:
        !            84:        /* restore terminal modes and allow signals */
        !            85:        if (echo)
        !            86:                tcsetattr(input, TCSANOW, &saved_tio);
        !            87:        (void) sigprocmask(SIG_SETMASK, &oset, NULL);
        !            88:
        !            89:        if (!from_stdin)
        !            90:                (void)close(input);
        !            91:        p = xstrdup(buf);
1.5       markus     92:        memset(buf, 0, sizeof(buf));
1.8     ! deraadt    93:        return (p);
1.1       deraadt    94: }