+/* $OpenBSD: readpass.c,v 1.47 2006/08/03 03:34:42 deraadt Exp $ */
/*
- * Copyright (c) 1988, 1993
- * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 2001 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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.
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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("$OpenBSD: readpass.c,v 1.25 2002/01/11 23:02:18 markus Exp $");
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#ifdef HAVE_PATHS_H
+# include <paths.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "xmalloc.h"
-#include "readpass.h"
+#include "misc.h"
#include "pathnames.h"
#include "log.h"
#include "ssh.h"
+#include "uidswap.h"
static char *
ssh_askpass(char *askpass, const char *msg)
fatal("internal error: askpass undefined");
if (pipe(p) < 0) {
error("ssh_askpass: pipe: %s", strerror(errno));
- return xstrdup("");
+ return NULL;
}
if ((pid = fork()) < 0) {
error("ssh_askpass: fork: %s", strerror(errno));
- return xstrdup("");
+ return NULL;
}
if (pid == 0) {
- seteuid(getuid());
- setuid(getuid());
+ permanently_drop_suid(getuid());
close(p[0]);
if (dup2(p[1], STDOUT_FILENO) < 0)
fatal("ssh_askpass: dup2: %s", strerror(errno));
if (errno != EINTR)
break;
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ memset(buf, 0, sizeof(buf));
+ return NULL;
+ }
+
buf[strcspn(buf, "\r\n")] = '\0';
pass = xstrdup(buf);
memset(buf, 0, sizeof(buf));
int rppflags, use_askpass = 0, ttyfd;
rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
- if (flags & RP_ALLOW_STDIN) {
- if (!isatty(STDIN_FILENO))
+ if (flags & RP_USE_ASKPASS)
+ use_askpass = 1;
+ else if (flags & RP_ALLOW_STDIN) {
+ if (!isatty(STDIN_FILENO)) {
+ debug("read_passphrase: stdin is not a tty");
use_askpass = 1;
+ }
} else {
rppflags |= RPP_REQUIRE_TTY;
ttyfd = open(_PATH_TTY, O_RDWR);
if (ttyfd >= 0)
close(ttyfd);
- else
+ else {
+ debug("read_passphrase: can't open %s: %s", _PATH_TTY,
+ strerror(errno));
use_askpass = 1;
+ }
}
+ if ((flags & RP_USE_ASKPASS) && getenv("DISPLAY") == NULL)
+ return (flags & RP_ALLOW_EOF) ? NULL : xstrdup("");
+
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);
+ if ((ret = ssh_askpass(askpass, prompt)) == NULL)
+ if (!(flags & RP_ALLOW_EOF))
+ return xstrdup("");
+ return ret;
}
- if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL)
+ if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) {
+ if (flags & RP_ALLOW_EOF)
+ return NULL;
return xstrdup("");
+ }
ret = xstrdup(buf);
memset(buf, 'x', sizeof buf);
return ret;
}
+
+int
+ask_permission(const char *fmt, ...)
+{
+ va_list args;
+ char *p, prompt[1024];
+ int allowed = 0;
+
+ va_start(args, fmt);
+ vsnprintf(prompt, sizeof(prompt), fmt, args);
+ va_end(args);
+
+ p = read_passphrase(prompt, RP_USE_ASKPASS|RP_ALLOW_EOF);
+ if (p != NULL) {
+ /*
+ * Accept empty responses and responses consisting
+ * of the word "yes" as affirmative.
+ */
+ if (*p == '\0' || *p == '\n' ||
+ strcasecmp(p, "yes") == 0)
+ allowed = 1;
+ xfree(p);
+ }
+
+ return (allowed);
+}
andersk / openssh.git / blobdiff