2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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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
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18 * may be used to endorse or promote products derived from this software
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35 RCSID("$OpenBSD: readpass.c,v 1.23 2001/11/08 10:51:08 markus Exp $");
39 #include "pathnames.h"
44 ssh_askpass(char *askpass, const char *msg)
52 if (fflush(stdout) != 0)
53 error("ssh_askpass: fflush: %s", strerror(errno));
55 fatal("internal error: askpass undefined");
57 error("ssh_askpass: pipe: %s", strerror(errno));
60 if ((pid = fork()) < 0) {
61 error("ssh_askpass: fork: %s", strerror(errno));
68 if (dup2(p[1], STDOUT_FILENO) < 0)
69 fatal("ssh_askpass: dup2: %s", strerror(errno));
70 execlp(askpass, askpass, msg, (char *) 0);
71 fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
74 len = read(p[0], buf, sizeof buf -1);
76 while (waitpid(pid, &status, 0) < 0)
82 buf[strcspn(buf, "\r\n")] = '\0';
84 memset(buf, 0, sizeof(buf));
89 * Reads a passphrase from /dev/tty with echo turned off/on. Returns the
90 * passphrase (allocated with xmalloc). Exits if EOF is encountered. If
91 * RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no
95 read_passphrase(const char *prompt, int flags)
97 char *askpass = NULL, *ret, buf[1024];
98 int rppflags, use_askpass = 0, ttyfd;
100 rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
101 if (flags & RP_ALLOW_STDIN) {
102 if (!isatty(STDIN_FILENO))
105 rppflags |= RPP_REQUIRE_TTY;
106 ttyfd = open("/dev/tty", O_RDWR);
113 if (use_askpass && getenv("DISPLAY")) {
114 if (getenv(SSH_ASKPASS_ENV))
115 askpass = getenv(SSH_ASKPASS_ENV);
117 askpass = _PATH_SSH_ASKPASS_DEFAULT;
118 return ssh_askpass(askpass, prompt);
121 if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL)
125 memset(buf, 'x', sizeof buf);