blob: 10171cf678b65f28570852ac85e697cb11c8a002 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller50945fa1999-12-09 10:31:37 +11002 * 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.
Damien Miller95def091999-11-25 00:26:21 +110032 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100033
34#include "includes.h"
Ben Lindstrom949974b2001-06-25 05:20:31 +000035RCSID("$OpenBSD: readpass.c,v 1.19 2001/06/24 05:35:33 markus Exp $");
36
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037#include "xmalloc.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000038#include "readpass.h"
Ben Lindstrom5eb97b62001-04-19 20:33:07 +000039#include "pathnames.h"
40#include "log.h"
41#include "atomicio.h"
42#include "ssh.h"
43
Ben Lindstrombba81212001-06-25 05:01:22 +000044static char *
Ben Lindstrom6d849312001-05-02 01:30:32 +000045ssh_askpass(char *askpass, const char *msg)
Ben Lindstrom5eb97b62001-04-19 20:33:07 +000046{
47 pid_t pid;
48 size_t len;
49 char *nl, *pass;
50 int p[2], status;
51 char buf[1024];
52
53 if (fflush(stdout) != 0)
54 error("ssh_askpass: fflush: %s", strerror(errno));
55 if (askpass == NULL)
56 fatal("internal error: askpass undefined");
57 if (pipe(p) < 0)
58 fatal("ssh_askpass: pipe: %s", strerror(errno));
59 if ((pid = fork()) < 0)
60 fatal("ssh_askpass: fork: %s", strerror(errno));
61 if (pid == 0) {
62 seteuid(getuid());
63 setuid(getuid());
64 close(p[0]);
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));
69 }
70 close(p[1]);
71 len = read(p[0], buf, sizeof buf);
72 close(p[0]);
73 while (waitpid(pid, &status, 0) < 0)
74 if (errno != EINTR)
75 break;
76 if (len <= 1)
77 return xstrdup("");
78 nl = strchr(buf, '\n');
79 if (nl)
80 *nl = '\0';
81 pass = xstrdup(buf);
82 memset(buf, 0, sizeof(buf));
83 return pass;
84}
85
Damien Miller5428f641999-11-25 11:54:57 +110086/*
Ben Lindstrom949974b2001-06-25 05:20:31 +000087 * 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
90 * tty is available
Damien Miller874d77b2000-10-14 16:23:11 +110091 */
Damien Miller95def091999-11-25 00:26:21 +110092char *
Ben Lindstrom949974b2001-06-25 05:20:31 +000093read_passphrase(const char *prompt, int flags)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094{
Ben Lindstrom949974b2001-06-25 05:20:31 +000095 char *askpass = NULL, *ret, buf[1024];
96 int rppflags, use_askpass = 0, ttyfd;
Ben Lindstrom5eb97b62001-04-19 20:33:07 +000097
Ben Lindstrom949974b2001-06-25 05:20:31 +000098 rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
99 if (flags & RP_ALLOW_STDIN) {
Ben Lindstrom5eb97b62001-04-19 20:33:07 +0000100 if (!isatty(STDIN_FILENO))
101 use_askpass = 1;
102 } else {
Ben Lindstrom949974b2001-06-25 05:20:31 +0000103 rppflags |= RPP_REQUIRE_TTY;
Ben Lindstrom5eb97b62001-04-19 20:33:07 +0000104 ttyfd = open("/dev/tty", O_RDWR);
105 if (ttyfd >= 0)
106 close(ttyfd);
107 else
108 use_askpass = 1;
109 }
110
111 if (use_askpass && getenv("DISPLAY")) {
112 if (getenv(SSH_ASKPASS_ENV))
113 askpass = getenv(SSH_ASKPASS_ENV);
114 else
115 askpass = _PATH_SSH_ASKPASS_DEFAULT;
116 return ssh_askpass(askpass, prompt);
117 }
118
Ben Lindstrom949974b2001-06-25 05:20:31 +0000119 if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL)
120 return NULL;
121
122 ret = xstrdup(buf);
123 memset(buf, 'x', sizeof buf);
124 return ret;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125}