/*
 * Dropbear SSH
 * 
 * Copyright (c) 2004 Martin Carlsson
 * Portions (c) 2004 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. */

/* Validates a user password using PAM */

#include "includes.h"
#include "session.h"
#include "buffer.h"
#include "dbutil.h"
#include "auth.h"

#ifdef ENABLE_SVR_PAM_AUTH

#if defined(HAVE_SECURITY_PAM_APPL_H)
#include <security/pam_appl.h>
#elif defined (HAVE_PAM_PAM_APPL_H)
#include <pam/pam_appl.h>
#endif

struct UserDataS {
	char* user;
	char* passwd;
};

/* PAM conversation function - for now we only handle one message */
int 
pamConvFunc(int num_msg, 
		const struct pam_message **msg,
		struct pam_response **respp, 
		void *appdata_ptr) {

	int rc = PAM_SUCCESS;
	struct pam_response* resp = NULL;
	struct UserDataS* userDatap = (struct UserDataS*) appdata_ptr;
	unsigned int msg_len = 0;
	unsigned int i = 0;
	char * compare_message = NULL;

	TRACE(("enter pamConvFunc"))

	if (num_msg != 1) {
		/* If you're getting here - Dropbear probably can't support your pam
		 * modules. This whole file is a bit of a hack around lack of
		 * asynchronocity in PAM anyway. */
		dropbear_log(LOG_INFO, "pamConvFunc() called with >1 messages: not supported.");
		return PAM_CONV_ERR;
	}

	/* make a copy we can strip */
	compare_message = m_strdup((*msg)->msg);
	
	/* Make the string lowercase. */
	msg_len = strlen(compare_message);
	for (i = 0; i < msg_len; i++) {
		compare_message[i] = tolower(compare_message[i]);
	}

	/* If the string ends with ": ", remove the space. 
	   ie "login: " vs "login:" */
	if (msg_len > 2 
			&& compare_message[msg_len-2] == ':' 
			&& compare_message[msg_len-1] == ' ') {
		compare_message[msg_len-1] = '\0';
	}

	switch((*msg)->msg_style) {

		case PAM_PROMPT_ECHO_OFF: