2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 RCSID("$OpenBSD: readpass.c,v 1.20 2001/07/02 22:29:20 markus Exp $");
39 #include "pathnames.h"
45 ssh_askpass(char *askpass, const char *msg)
53 if (fflush(stdout) != 0)
54 error("ssh_askpass: fflush: %s", strerror(errno));
56 fatal("internal error: askpass undefined");
58 fatal("ssh_askpass: pipe: %s", strerror(errno));
59 if ((pid = fork()) < 0)
60 fatal("ssh_askpass: fork: %s", strerror(errno));
65 if (dup2(p[1], STDOUT_FILENO) < 0)
66 fatal("ssh_askpass: dup2: %s", strerror(errno));
67 execlp(askpass, askpass, msg, (char *) 0);
68 fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
71 len = read(p[0], buf, sizeof buf);
73 while (waitpid(pid, &status, 0) < 0)
78 nl = strchr(buf, '\n');
82 memset(buf, 0, sizeof(buf));
87 * Reads a passphrase from /dev/tty with echo turned off/on. Returns the
88 * passphrase (allocated with xmalloc). Exits if EOF is encountered. If
89 * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no
93 read_passphrase(const char *prompt, int flags)
95 char *askpass = NULL, *ret, buf[1024];
96 int rppflags, use_askpass = 0, ttyfd;
98 rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
99 if (flags & RP_ALLOW_STDIN) {
100 if (!isatty(STDIN_FILENO))
103 rppflags |= RPP_REQUIRE_TTY;
104 ttyfd = open("/dev/tty", O_RDWR);
111 if (use_askpass && getenv("DISPLAY")) {
112 if (getenv(SSH_ASKPASS_ENV))
113 askpass = getenv(SSH_ASKPASS_ENV);
115 askpass = _PATH_SSH_ASKPASS_DEFAULT;
116 return ssh_askpass(askpass, prompt);
119 if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL)
123 memset(buf, 'x', sizeof buf);