propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)

            to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)

--HG--
extra : convert_revision : d26d5eb2837f46b56a33fb0e7573aa0201abd4d5

1 files changed, 153 insertions, 0 deletions

diff --git a/cli-authpasswd.c b/cli-authpasswd.c
new file mode 100644
index 0000000..2500a25
--- /dev/null
+++ b/cli-authpasswd.c
@@ -0,0 +1,153 @@
+/*
+ * Dropbear SSH
+ * 
+ * Copyright (c) 2002,2003 Matt Johnston
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE. */
+
+#include "includes.h"
+#include "buffer.h"
+#include "dbutil.h"
+#include "session.h"
+#include "ssh.h"
+#include "runopts.h"
+
+#ifdef ENABLE_CLI_PASSWORD_AUTH
+
+#ifdef ENABLE_CLI_ASKPASS_HELPER
+/* Returns 1 if we want to use the askpass program, 0 otherwise */
+static int want_askpass()
+{
+	char* askpass_prog = NULL;
+
+	askpass_prog = getenv("SSH_ASKPASS");
+	return askpass_prog && !isatty(STDIN_FILENO) && getenv("DISPLAY");
+}
+
+/* returns a statically allocated password from a helper app, or NULL
+ * on failure */
+static char *gui_getpass(const char *prompt) {
+
+	pid_t pid;
+	int p[2], maxlen, len, status;
+	static char buf[DROPBEAR_MAX_CLI_PASS + 1];
+	char* helper = NULL;
+
+	TRACE(("enter gui_getpass"))
+
+	helper = getenv("SSH_ASKPASS");
+	if (!helper)
+	{
+		TRACE(("leave gui_getpass: no askpass program"))
+		return NULL;
+	}
+
+	if (pipe(p) < 0) {
+		TRACE(("error creating child pipe"))
+		return NULL;
+	}
+
+	pid = fork();
+
+	if (pid < 0) {
+		TRACE(("fork error"))
+		return NULL;
+	}
+
+	if (!pid) {
+		/* child */
+		close(p[0]);
+		if (dup2(p[1], STDOUT_FILENO) < 0) {
+			TRACE(("error redirecting stdout"))
+			exit(1);
+		}
+		close(p[1]);
+		execlp(helper, helper, prompt, (char *)0);
+		TRACE(("execlp error"))
+		exit(1);
+	}
+
+	close(p[1]);
+	maxlen = sizeof(buf);
+	while (maxlen > 0) {
+		len = read(p[0], buf + sizeof(buf) - maxlen, maxlen);
+		if (len > 0) {
+			maxlen -= len;
+		} else {
+			if (errno != EINTR)
+				break;
+		}
+	}
+
+	close(p[0]);
+
+	while (waitpid(pid, &status, 0) < 0 && errno == EINTR)
+		;
+	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+		return(NULL);
+
+	len = sizeof(buf) - maxlen;
+	buf[len] = '\0';
+	if (len > 0 && buf[len - 1] == '\n')
+		buf[len - 1] = '\0';
+
+	TRACE(("leave gui_getpass"))
+	return(buf);
+}
+#endif /* ENABLE_CLI_ASKPASS_HELPER */
+
+void cli_auth_password() {
+
+	char* password = NULL;
+	char prompt[80];
+
+	TRACE(("enter cli_auth_password"))
+	CHECKCLEARTOWRITE();
+
+	snprintf(prompt, sizeof(prompt), "%s@%s's password: ", 
+				cli_opts.username, cli_opts.remotehost);
+#ifdef ENABLE_CLI_ASKPASS_HELPER
+	if (want_askpass())
+		password = gui_getpass(prompt);
+	else
+#endif
+		password = getpass_or_cancel(prompt);
+
+	buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
+
+	buf_putstring(ses.writepayload, cli_opts.username,
+			strlen(cli_opts.username));
+
+	buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, 
+			SSH_SERVICE_CONNECTION_LEN);
+
+	buf_putstring(ses.writepayload, AUTH_METHOD_PASSWORD, 
+			AUTH_METHOD_PASSWORD_LEN);
+
+	buf_putbyte(ses.writepayload, 0); /* FALSE - so says the spec */
+
+	buf_putstring(ses.writepayload, password, strlen(password));
+
+	encrypt_packet();
+	m_burn(password, strlen(password));
+
+	TRACE(("leave cli_auth_password"))
+}
+#endif	/* ENABLE_CLI_PASSWORD_AUTH */