125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: readpass.c,v 1.15 2001/04/18 21:57:41 markus Exp $");
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#include "xmalloc.h"
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#include "cli.h"
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#include "readpass.h"
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#include "pathnames.h"
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#include "log.h"
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#include "atomicio.h"
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#include "ssh.h"
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char *
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ssh_askpass(char *askpass, char *msg)
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{
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pid_t pid;
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size_t len;
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char *nl, *pass;
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int p[2], status;
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char buf[1024];
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if (fflush(stdout) != 0)
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error("ssh_askpass: fflush: %s", strerror(errno));
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if (askpass == NULL)
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fatal("internal error: askpass undefined");
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if (pipe(p) < 0)
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fatal("ssh_askpass: pipe: %s", strerror(errno));
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if ((pid = fork()) < 0)
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fatal("ssh_askpass: fork: %s", strerror(errno));
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if (pid == 0) {
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seteuid(getuid());
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setuid(getuid());
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close(p[0]);
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if (dup2(p[1], STDOUT_FILENO) < 0)
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fatal("ssh_askpass: dup2: %s", strerror(errno));
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execlp(askpass, askpass, msg, (char *) 0);
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fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
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}
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close(p[1]);
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len = read(p[0], buf, sizeof buf);
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close(p[0]);
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while (waitpid(pid, &status, 0) < 0)
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if (errno != EINTR)
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break;
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if (len <= 1)
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return xstrdup("");
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nl = strchr(buf, '\n');
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if (nl)
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*nl = '\0';
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pass = xstrdup(buf);
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memset(buf, 0, sizeof(buf));
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return pass;
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}
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/*
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* Reads a passphrase from /dev/tty with echo turned off. Returns the
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* passphrase (allocated with xmalloc), being very careful to ensure that
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* no other userland buffer is storing the password.
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*/
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/*
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* Note: the funcationallity of this routing has been moved to
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* cli_read_passphrase(). This routing remains to maintain
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* compatibility with existing code.
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*/
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char *
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read_passphrase(char *prompt, int from_stdin)
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{
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char *askpass = NULL;
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int use_askpass = 0, ttyfd;
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if (from_stdin) {
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if (!isatty(STDIN_FILENO))
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use_askpass = 1;
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} else {
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ttyfd = open("/dev/tty", O_RDWR);
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if (ttyfd >= 0)
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close(ttyfd);
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else
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use_askpass = 1;
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}
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if (use_askpass && getenv("DISPLAY")) {
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if (getenv(SSH_ASKPASS_ENV))
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askpass = getenv(SSH_ASKPASS_ENV);
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else
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askpass = _PATH_SSH_ASKPASS_DEFAULT;
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return ssh_askpass(askpass, prompt);
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}
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return cli_read_passphrase(prompt, from_stdin, 0);
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}
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