blob: b93eaba4360a6529a74b18db9248727e00c3b8e9 [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 Lindstrom5eb97b62001-04-19 20:33:07 +000035RCSID("$OpenBSD: readpass.c,v 1.15 2001/04/18 21:57:41 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036
37#include "xmalloc.h"
Damien Miller874d77b2000-10-14 16:23:11 +110038#include "cli.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000039#include "readpass.h"
Ben Lindstrom5eb97b62001-04-19 20:33:07 +000040#include "pathnames.h"
41#include "log.h"
42#include "atomicio.h"
43#include "ssh.h"
44
45char *
46ssh_askpass(char *askpass, char *msg)
47{
48 pid_t pid;
49 size_t len;
50 char *nl, *pass;
51 int p[2], status;
52 char buf[1024];
53
54 if (fflush(stdout) != 0)
55 error("ssh_askpass: fflush: %s", strerror(errno));
56 if (askpass == NULL)
57 fatal("internal error: askpass undefined");
58 if (pipe(p) < 0)
59 fatal("ssh_askpass: pipe: %s", strerror(errno));
60 if ((pid = fork()) < 0)
61 fatal("ssh_askpass: fork: %s", strerror(errno));
62 if (pid == 0) {
63 seteuid(getuid());
64 setuid(getuid());
65 close(p[0]);
66 if (dup2(p[1], STDOUT_FILENO) < 0)
67 fatal("ssh_askpass: dup2: %s", strerror(errno));
68 execlp(askpass, askpass, msg, (char *) 0);
69 fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
70 }
71 close(p[1]);
72 len = read(p[0], buf, sizeof buf);
73 close(p[0]);
74 while (waitpid(pid, &status, 0) < 0)
75 if (errno != EINTR)
76 break;
77 if (len <= 1)
78 return xstrdup("");
79 nl = strchr(buf, '\n');
80 if (nl)
81 *nl = '\0';
82 pass = xstrdup(buf);
83 memset(buf, 0, sizeof(buf));
84 return pass;
85}
86
Damien Millerf052aaf2000-01-22 19:47:21 +110087
Damien Miller5428f641999-11-25 11:54:57 +110088/*
89 * Reads a passphrase from /dev/tty with echo turned off. Returns the
Damien Miller50945fa1999-12-09 10:31:37 +110090 * passphrase (allocated with xmalloc), being very careful to ensure that
91 * no other userland buffer is storing the password.
Damien Miller5428f641999-11-25 11:54:57 +110092 */
Damien Miller874d77b2000-10-14 16:23:11 +110093/*
94 * Note: the funcationallity of this routing has been moved to
95 * cli_read_passphrase(). This routing remains to maintain
96 * compatibility with existing code.
97 */
Damien Miller95def091999-11-25 00:26:21 +110098char *
Damien Miller92e78f82001-01-17 11:10:48 +110099read_passphrase(const char *prompt, int from_stdin)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100{
Ben Lindstrom5eb97b62001-04-19 20:33:07 +0000101 char *askpass = NULL;
102 int use_askpass = 0, ttyfd;
103
104 if (from_stdin) {
105 if (!isatty(STDIN_FILENO))
106 use_askpass = 1;
107 } else {
108 ttyfd = open("/dev/tty", O_RDWR);
109 if (ttyfd >= 0)
110 close(ttyfd);
111 else
112 use_askpass = 1;
113 }
114
115 if (use_askpass && getenv("DISPLAY")) {
116 if (getenv(SSH_ASKPASS_ENV))
117 askpass = getenv(SSH_ASKPASS_ENV);
118 else
119 askpass = _PATH_SSH_ASKPASS_DEFAULT;
120 return ssh_askpass(askpass, prompt);
121 }
122
Damien Miller874d77b2000-10-14 16:23:11 +1100123 return cli_read_passphrase(prompt, from_stdin, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124}