Vendor import of OpenSSH.

1 files changed, 119 insertions, 0 deletions

diff --git a/crypto/openssh/readpass.c b/crypto/openssh/readpass.c
new file mode 100644
index 0000000..deb37cab6
--- /dev/null
+++ b/crypto/openssh/readpass.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 1988, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$Id: readpass.c,v 1.9 2000/01/21 21:16:00 deraadt Exp $");
+
+#include "xmalloc.h"
+#include "ssh.h"
+
+volatile int intr;
+
+void
+intcatch()
+{
+	intr = 1;
+}
+
+/*
+ * Reads a passphrase from /dev/tty with echo turned off.  Returns the
+ * passphrase (allocated with xmalloc), being very careful to ensure that
+ * no other userland buffer is storing the password.
+ */
+char *
+read_passphrase(const char *prompt, int from_stdin)
+{
+	char buf[1024], *p, ch;
+	struct termios tio, saved_tio;
+	sigset_t oset, nset;
+	struct sigaction sa, osa;
+	int input, output, echo = 0;
+  
+	if (from_stdin) {
+		input = STDIN_FILENO;
+		output = STDERR_FILENO;
+	} else
+		input = output = open("/dev/tty", O_RDWR);
+
+	if (input == -1)
+		fatal("You have no controlling tty.  Cannot read passphrase.\n");
+
+	/* block signals, get terminal modes and turn off echo */
+	sigemptyset(&nset);
+	sigaddset(&nset, SIGTSTP);
+	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = intcatch;
+	(void) sigaction(SIGINT, &sa, &osa);
+
+	intr = 0;
+
+	if (tcgetattr(input, &saved_tio) == 0 && (saved_tio.c_lflag & ECHO)) {
+		echo = 1;
+		tio = saved_tio;
+		tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
+		(void) tcsetattr(input, TCSANOW, &tio);
+	}
+
+	fflush(stdout);
+
+	(void)write(output, prompt, strlen(prompt));
+	for (p = buf; read(input, &ch, 1) == 1 && ch != '\n';) {
+		if (intr)
+			break;
+		if (p < buf + sizeof(buf) - 1)
+			*p++ = ch;
+	}
+	*p = '\0';
+	if (!intr)
+		(void)write(output, "\n", 1);
+
+	/* restore terminal modes and allow signals */
+	if (echo)
+		tcsetattr(input, TCSANOW, &saved_tio);
+	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
+	(void) sigaction(SIGINT, &osa, NULL);
+
+	if (intr) {
+		kill(getpid(), SIGINT);
+		sigemptyset(&nset);
+		/* XXX tty has not neccessarily drained by now? */
+		sigsuspend(&nset);
+	}
+
+	if (!from_stdin)
+		(void)close(input);
+	p = xstrdup(buf);
+	memset(buf, 0, sizeof(buf));
+	return (p);
+}