Flatten and clean up.

1 files changed, 248 insertions, 0 deletions

diff --git a/lib/openpam_ttyconv.c b/lib/openpam_ttyconv.c
new file mode 100644
index 0000000..a6820b9
--- /dev/null
+++ b/lib/openpam_ttyconv.c
@@ -0,0 +1,248 @@
+/*-
+ * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
+ * Copyright (c) 2004-2007 Dag-Erling Smørgrav
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * Network Associates Laboratories, the Security Research Division of
+ * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
+ * ("CBOSS"), as part of the DARPA CHATS research program.
+ *
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $Id: openpam_ttyconv.c 408 2007-12-21 11:36:24Z des $
+ */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+int openpam_ttyconv_timeout = 0;
+
+static void
+timeout(int sig)
+{
+
+	(void)sig;
+}
+
+static char *
+prompt(const char *msg)
+{
+	char buf[PAM_MAX_RESP_SIZE];
+	struct sigaction action, saved_action;
+	sigset_t saved_sigset, sigset;
+	unsigned int saved_alarm;
+	int eof, error, fd;
+	size_t len;
+	char *retval;
+	char ch;
+
+	sigemptyset(&sigset);
+	sigaddset(&sigset, SIGINT);
+	sigaddset(&sigset, SIGTSTP);
+	sigprocmask(SIG_SETMASK, &sigset, &saved_sigset);
+	action.sa_handler = &timeout;
+	action.sa_flags = 0;
+	sigemptyset(&action.sa_mask);
+	sigaction(SIGALRM, &action, &saved_action);
+	fputs(msg, stdout);
+	fflush(stdout);
+#ifdef HAVE_FPURGE
+	fpurge(stdin);
+#endif
+	fd = fileno(stdin);
+	buf[0] = '\0';
+	eof = error = 0;
+	saved_alarm = 0;
+	if (openpam_ttyconv_timeout >= 0)
+		saved_alarm = alarm(openpam_ttyconv_timeout);
+	ch = '\0';
+	for (len = 0; ch != '\n' && !eof && !error; ++len) {
+		switch (read(fd, &ch, 1)) {
+		case 1:
+			if (len < PAM_MAX_RESP_SIZE - 1) {
+				buf[len + 1] = '\0';
+				buf[len] = ch;
+			}
+			break;
+		case 0:
+			eof = 1;
+			break;
+		default:
+			error = errno;
+			break;
+		}
+	}
+	if (openpam_ttyconv_timeout >= 0)
+		alarm(0);
+	sigaction(SIGALRM, &saved_action, NULL);
+	sigprocmask(SIG_SETMASK, &saved_sigset, NULL);
+	if (saved_alarm > 0)
+		alarm(saved_alarm);
+	if (error == EINTR)
+		fputs(" timeout!", stderr);
+	if (error || eof) {
+		fputs("\n", stderr);
+		memset(buf, 0, sizeof(buf));
+		return (NULL);
+	}
+	/* trim trailing whitespace */
+	for (len = strlen(buf); len > 0; --len)
+		if (buf[len - 1] != '\r' && buf[len - 1] != '\n')
+			break;
+	buf[len] = '\0';
+	retval = strdup(buf);
+	memset(buf, 0, sizeof(buf));
+	return (retval);
+}
+
+static char *
+prompt_echo_off(const char *msg)
+{
+	struct termios tattr;
+	tcflag_t lflag;
+	char *ret;
+	int fd;
+
+	fd = fileno(stdin);
+	if (tcgetattr(fd, &tattr) != 0) {
+		openpam_log(PAM_LOG_ERROR, "tcgetattr(): %m");
+		return (NULL);
+	}
+	lflag = tattr.c_lflag;
+	tattr.c_lflag &= ~ECHO;
+	if (tcsetattr(fd, TCSAFLUSH, &tattr) != 0) {
+		openpam_log(PAM_LOG_ERROR, "tcsetattr(): %m");
+		return (NULL);
+	}
+	ret = prompt(msg);
+	tattr.c_lflag = lflag;
+	(void)tcsetattr(fd, TCSANOW, &tattr);
+	if (ret != NULL)
+		fputs("\n", stdout);
+	return (ret);
+}
+
+/*
+ * OpenPAM extension
+ *
+ * Simple tty-based conversation function
+ */
+
+int
+openpam_ttyconv(int n,
+	 const struct pam_message **msg,
+	 struct pam_response **resp,
+	 void *data)
+{
+	struct pam_response *aresp;
+	int i;
+
+	ENTER();
+	(void)data;
+	if (n <= 0 || n > PAM_MAX_NUM_MSG)
+		RETURNC(PAM_CONV_ERR);
+	if ((aresp = calloc(n, sizeof *aresp)) == NULL)
+		RETURNC(PAM_BUF_ERR);
+	for (i = 0; i < n; ++i) {
+		aresp[i].resp_retcode = 0;
+		aresp[i].resp = NULL;
+		switch (msg[i]->msg_style) {
+		case PAM_PROMPT_ECHO_OFF:
+			aresp[i].resp = prompt_echo_off(msg[i]->msg);
+			if (aresp[i].resp == NULL)
+				goto fail;
+			break;
+		case PAM_PROMPT_ECHO_ON:
+			aresp[i].resp = prompt(msg[i]->msg);
+			if (aresp[i].resp == NULL)
+				goto fail;
+			break;
+		case PAM_ERROR_MSG:
+			fputs(msg[i]->msg, stderr);
+			if (strlen(msg[i]->msg) > 0 &&
+			    msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
+				fputc('\n', stderr);
+			break;
+		case PAM_TEXT_INFO:
+			fputs(msg[i]->msg, stdout);
+			if (strlen(msg[i]->msg) > 0 &&
+			    msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
+				fputc('\n', stdout);
+			break;
+		default:
+			goto fail;
+		}
+	}
+	*resp = aresp;
+	RETURNC(PAM_SUCCESS);
+ fail:
+	for (i = 0; i < n; ++i) {
+		if (aresp[i].resp != NULL) {
+			memset(aresp[i].resp, 0, strlen(aresp[i].resp));
+			FREE(aresp[i].resp);
+		}
+	}
+	memset(aresp, 0, n * sizeof *aresp);
+	FREE(aresp);
+	*resp = NULL;
+	RETURNC(PAM_CONV_ERR);
+}
+
+/*
+ * Error codes:
+ *
+ *	PAM_SYSTEM_ERR
+ *	PAM_BUF_ERR
+ *	PAM_CONV_ERR
+ */
+
+/**
+ * The =openpam_ttyconv function is a standard conversation function
+ * suitable for use on TTY devices.
+ * It should be adequate for the needs of most text-based interactive
+ * programs.
+ *
+ * The =openpam_ttyconv function allows the application to specify a
+ * timeout for user input by setting the global integer variable
+ * :openpam_ttyconv_timeout to the length of the timeout in seconds.
+ *
+ * >openpam_nullconv
+ * >pam_prompt
+ * >pam_vprompt
+ */