/*
-
-readpass.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Mon Jul 10 22:08:59 1995 ylo
-
-Functions for reading passphrases and passwords.
-
-*/
+ * 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("$Id$");
+RCSID("$OpenBSD: readpass.c,v 1.17 2001/05/06 17:52:07 mouring Exp $");
#include "xmalloc.h"
+#include "cli.h"
+#include "readpass.h"
+#include "pathnames.h"
+#include "log.h"
+#include "atomicio.h"
#include "ssh.h"
-/* Saved old terminal mode for read_passphrase. */
-static struct termios saved_tio;
-
-/* Old interrupt signal handler for read_passphrase. */
-static void (*old_handler)(int sig) = NULL;
-
-/* Interrupt signal handler for read_passphrase. */
-
-void intr_handler(int sig)
+char *
+ssh_askpass(char *askpass, const char *msg)
{
- /* Restore terminal modes. */
- tcsetattr(fileno(stdin), TCSANOW, &saved_tio);
- /* Restore the old signal handler. */
- signal(sig, old_handler);
- /* Resend the signal, with the old handler. */
- kill(getpid(), sig);
+ pid_t pid;
+ size_t len;
+ char *nl, *pass;
+ int p[2], status;
+ char buf[1024];
+
+ if (fflush(stdout) != 0)
+ error("ssh_askpass: fflush: %s", strerror(errno));
+ if (askpass == NULL)
+ fatal("internal error: askpass undefined");
+ if (pipe(p) < 0)
+ fatal("ssh_askpass: pipe: %s", strerror(errno));
+ if ((pid = fork()) < 0)
+ fatal("ssh_askpass: fork: %s", strerror(errno));
+ if (pid == 0) {
+ seteuid(getuid());
+ setuid(getuid());
+ close(p[0]);
+ if (dup2(p[1], STDOUT_FILENO) < 0)
+ fatal("ssh_askpass: dup2: %s", strerror(errno));
+ execlp(askpass, askpass, msg, (char *) 0);
+ fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
+ }
+ close(p[1]);
+ len = read(p[0], buf, sizeof buf);
+ close(p[0]);
+ while (waitpid(pid, &status, 0) < 0)
+ if (errno != EINTR)
+ break;
+ if (len <= 1)
+ return xstrdup("");
+ nl = strchr(buf, '\n');
+ if (nl)
+ *nl = '\0';
+ pass = xstrdup(buf);
+ memset(buf, 0, sizeof(buf));
+ return pass;
}
-/* Reads a passphrase from /dev/tty with echo turned off. Returns the
- passphrase (allocated with xmalloc). Exits if EOF is encountered.
- The passphrase if read from stdin if from_stdin is true (as is the
- case with ssh-keygen). */
-char *read_passphrase(const char *prompt, int from_stdin)
+/*
+ * 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.
+ */
+/*
+ * Note: the funcationallity of this routing has been moved to
+ * cli_read_passphrase(). This routing remains to maintain
+ * compatibility with existing code.
+ */
+char *
+read_passphrase(const char *prompt, int from_stdin)
{
- char buf[1024], *cp;
- struct termios tio;
- FILE *f;
-
- if (from_stdin)
- f = stdin;
- else
- {
- /* Read the passphrase from /dev/tty to make it possible to ask it even
- when stdin has been redirected. */
- f = fopen("/dev/tty", "r");
- if (!f)
- {
- /* No controlling terminal and no DISPLAY. Nowhere to read. */
- fprintf(stderr, "You have no controlling tty and no DISPLAY. Cannot read passphrase.\n");
- exit(1);
+ char *askpass = NULL;
+ int use_askpass = 0, ttyfd;
+
+ if (from_stdin) {
+ if (!isatty(STDIN_FILENO))
+ use_askpass = 1;
+ } else {
+ ttyfd = open("/dev/tty", O_RDWR);
+ if (ttyfd >= 0)
+ close(ttyfd);
+ else
+ use_askpass = 1;
}
- }
- /* Display the prompt (on stderr because stdout might be redirected). */
- fflush(stdout);
- fprintf(stderr, "%s", prompt);
- fflush(stderr);
-
- /* Get terminal modes. */
- tcgetattr(fileno(f), &tio);
- saved_tio = tio;
- /* Save signal handler and set the new handler. */
- old_handler = signal(SIGINT, intr_handler);
-
- /* Set new terminal modes disabling all echo. */
- tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
- tcsetattr(fileno(f), TCSANOW, &tio);
+ if (use_askpass && getenv("DISPLAY")) {
+ if (getenv(SSH_ASKPASS_ENV))
+ askpass = getenv(SSH_ASKPASS_ENV);
+ else
+ askpass = _PATH_SSH_ASKPASS_DEFAULT;
+ return ssh_askpass(askpass, prompt);
+ }
- /* Read the passphrase from the terminal. */
- if (fgets(buf, sizeof(buf), f) == NULL)
- {
- /* Got EOF. Just exit. */
- /* Restore terminal modes. */
- tcsetattr(fileno(f), TCSANOW, &saved_tio);
- /* Restore the signal handler. */
- signal(SIGINT, old_handler);
- /* Print a newline (the prompt probably didn\'t have one). */
- fprintf(stderr, "\n");
- /* Close the file. */
- if (f != stdin)
- fclose(f);
- exit(1);
- }
- /* Restore terminal modes. */
- tcsetattr(fileno(f), TCSANOW, &saved_tio);
- /* Restore the signal handler. */
- (void)signal(SIGINT, old_handler);
- /* Remove newline from the passphrase. */
- if (strchr(buf, '\n'))
- *strchr(buf, '\n') = 0;
- /* Allocate a copy of the passphrase. */
- cp = xstrdup(buf);
- /* Clear the buffer so we don\'t leave copies of the passphrase laying
- around. */
- memset(buf, 0, sizeof(buf));
- /* Print a newline since the prompt probably didn\'t have one. */
- fprintf(stderr, "\n");
- /* Close the file. */
- if (f != stdin)
- fclose(f);
- return cp;
+ return cli_read_passphrase(prompt, from_stdin, 0);
}
andersk / openssh.git / blobdiff