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Annotation of src/usr.bin/ssh/readpassphrase.c, Revision 1.1.4.1

1.1.4.1 ! jason       1: /*
        !             2:  * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  * 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. The name of the author may not be used to endorse or promote products
        !            14:  *    derived from this software without specific prior written permission.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
        !            17:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
        !            18:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
        !            19:  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
        !            20:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
        !            21:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
        !            22:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        !            23:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        !            24:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        !            25:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            26:  */
        !            27:
        !            28: #if defined(LIBC_SCCS) && !defined(lint)
        !            29: static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.7 2001/08/07 19:34:11 millert Exp $";
        !            30: #endif /* LIBC_SCCS and not lint */
        !            31:
        !            32: #include <ctype.h>
        !            33: #include <errno.h>
        !            34: #include <fcntl.h>
        !            35: #include <paths.h>
        !            36: #include <pwd.h>
        !            37: #include <signal.h>
        !            38: #include <string.h>
        !            39: #include <termios.h>
        !            40: #include <unistd.h>
        !            41: #include <readpassphrase.h>
        !            42:
        !            43: char *
        !            44: readpassphrase(prompt, buf, bufsiz, flags)
        !            45:        const char *prompt;
        !            46:        char *buf;
        !            47:        size_t bufsiz;
        !            48:        int flags;
        !            49: {
        !            50:        struct termios term, oterm;
        !            51:        char ch, *p, *end;
        !            52:        int input, output;
        !            53:        sigset_t oset, nset;
        !            54:
        !            55:        /* I suppose we could alloc on demand in this case (XXX). */
        !            56:        if (bufsiz == 0) {
        !            57:                errno = EINVAL;
        !            58:                return(NULL);
        !            59:        }
        !            60:
        !            61:        /*
        !            62:         * Read and write to /dev/tty if available.  If not, read from
        !            63:         * stdin and write to stderr unless a tty is required.
        !            64:         */
        !            65:        if ((input = output = open(_PATH_TTY, O_RDWR)) == -1) {
        !            66:                if (flags & RPP_REQUIRE_TTY) {
        !            67:                        errno = ENOTTY;
        !            68:                        return(NULL);
        !            69:                }
        !            70:                input = STDIN_FILENO;
        !            71:                output = STDERR_FILENO;
        !            72:        }
        !            73:
        !            74:        /*
        !            75:         * We block SIGINT and SIGTSTP so the terminal is not left
        !            76:         * in an inconsistent state (ie: no echo).  It would probably
        !            77:         * be better to simply catch these though.
        !            78:         */
        !            79:        sigemptyset(&nset);
        !            80:        sigaddset(&nset, SIGINT);
        !            81:        sigaddset(&nset, SIGTSTP);
        !            82:        (void)sigprocmask(SIG_BLOCK, &nset, &oset);
        !            83:
        !            84:        /* Turn off echo if possible. */
        !            85:        if (tcgetattr(input, &oterm) == 0) {
        !            86:                memcpy(&term, &oterm, sizeof(term));
        !            87:                if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO))
        !            88:                        term.c_lflag &= ~ECHO;
        !            89:                if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
        !            90:                        term.c_cc[VSTATUS] = _POSIX_VDISABLE;
        !            91:                (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
        !            92:        } else {
        !            93:                memset(&term, 0, sizeof(term));
        !            94:                memset(&oterm, 0, sizeof(oterm));
        !            95:        }
        !            96:
        !            97:        (void)write(output, prompt, strlen(prompt));
        !            98:        end = buf + bufsiz - 1;
        !            99:        for (p = buf; read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) {
        !           100:                if (p < end) {
        !           101:                        if ((flags & RPP_SEVENBIT))
        !           102:                                ch &= 0x7f;
        !           103:                        if (isalpha(ch)) {
        !           104:                                if ((flags & RPP_FORCELOWER))
        !           105:                                        ch = tolower(ch);
        !           106:                                if ((flags & RPP_FORCEUPPER))
        !           107:                                        ch = toupper(ch);
        !           108:                        }
        !           109:                        *p++ = ch;
        !           110:                }
        !           111:        }
        !           112:        *p = '\0';
        !           113:        if (!(term.c_lflag & ECHO))
        !           114:                (void)write(output, "\n", 1);
        !           115:
        !           116:        /* Restore old terminal settings and signal mask. */
        !           117:        if (memcmp(&term, &oterm, sizeof(term)) != 0)
        !           118:                (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm);
        !           119:        (void)sigprocmask(SIG_SETMASK, &oset, NULL);
        !           120:        if (input != STDIN_FILENO)
        !           121:                (void)close(input);
        !           122:        return(buf);
        !           123: }
        !           124:
        !           125: char *
        !           126: getpass(prompt)
        !           127:         const char *prompt;
        !           128: {
        !           129:        static char buf[_PASSWORD_LEN + 1];
        !           130:
        !           131:        return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
        !           132: }