#! /usr/bin/env bash

ZENITY="$(which 'zenity' 2>/dev/null)"
GDIALOG="$(which 'gdialog' 2>/dev/null)"
ASKPASS="$(which 'ssh-askpass' 'x11-ssh-askpass' '/usr/libexec/x11-ssh-askpass' 2>/dev/null | head -n 1)"
DIALOG="$(which 'dialog' 2>/dev/null)"
XTERM="$(which 'xterm' 2>/dev/null)"

if [ -x "${ZENITY}" ]; then
	# XXX: TODO: Zenity
	true
fi

if [ -x "${GDIALOG}" ]; then
	# XXX: TODO: Gdialog
	true
fi

if [ -x "${ASKPASS}" ]; then
	exec "${ASKPASS}" "$@"
	exit 1
fi

if [ -x "${DIALOG}" -a -x "${XTERM}" ]; then
	# XXX: TODO: dialog
	true
fi

if [ -x "${XTERM}" ]; then
	# XXX: TODO: xterm
	true
fi

exit 1

CK_C_INITIALIZE_ARGS cackey_args;

/** Extra certificates to include in token **/
struct cackey_pcsc_identity extra_certs[] = {
#include "cackey_builtin_certs.h"
};

/* Protected Authentication Path command */
#define CACKEY_PIN_COMMAND_DEFAULT_XSTR(str) CACKEY_PIN_COMMAND_DEFAULT_STR(str)
#define CACKEY_PIN_COMMAND_DEFAULT_STR(str) #str
static char *cackey_pin_command = NULL;
static char *cackey_pin_command_xonly = NULL;

/* PCSC Global Handles */
static LPSCARDCONTEXT cackey_pcsc_handle = NULL;

static unsigned long cackey_getversion(void) {
	static unsigned long retval = 255;
	unsigned long major = 0;
	unsigned long minor = 0;

	/* Apparently, CAC PINs are *EXACTLY* 8 bytes long -- pad with 0xFF if too short */
	if (pin_len >= 8) {
		memcpy(cac_pin, pin, 8);
	} else {
		memcpy(cac_pin, pin, pin_len);
	}

	/* Reject PINs which are too short */
	if (pin_len < 5) {
		CACKEY_DEBUG_PRINTF("Rejecting PIN which is too short (length = %lu, must be atleast 5)", pin_len);

		return(CACKEY_PCSC_E_BADPIN);
	}

	/* PIV authentication uses a "key_reference" of 0x80 */
	pcsc_identities = cackey_read_certs(slot, NULL, &num_certs);
	if (num_certs > 0 && pcsc_identities != NULL) {
		switch (pcsc_identities[0].id_type) {
			case CACKEY_ID_TYPE_PIV:
				CACKEY_DEBUG_PRINTF("We recently had a PIV card, so we will attempt to authenticate using the PIV Application key reference");

			CACKEY_DEBUG_PRINTF("Error.  Mutex initialization failed.");

			return(CKR_CANT_LOCK);
		}

		cackey_biglock_init = 1;
	}

	/* Define a command to prompt user for a PIN */
#ifdef CACKEY_PIN_COMMAND_DEFAULT
	cackey_pin_command = CACKEY_PIN_COMMAND_DEFAULT_XSTR(CACKEY_PIN_COMMAND_DEFAULT);
#endif
#ifdef CACKEY_PIN_COMMAND_XONLY_DEFAULT
	cackey_pin_command_xonly = CACKEY_PIN_COMMAND_DEFAULT_XSTR(CACKEY_PIN_COMMAND_XONLY_DEFAULT);
#endif

	if (getenv("DISPLAY") != NULL) {
		cackey_pin_command = cackey_pin_command_xonly;
	}

	if (getenv("CACKEY_PIN_COMMAND_XONLY") != NULL && getenv("DISPLAY") != NULL) {
		cackey_pin_command = getenv("CACKEY_PIN_COMMAND_XONLY");
	}

	if (getenv("CACKEY_PIN_COMMAND") != NULL) {
		cackey_pin_command = getenv("CACKEY_PIN_COMMAND");
	}

	CACKEY_DEBUG_PRINTF("Returning CKR_OK (%i)", CKR_OK);

	return(CKR_OK);
}

CK_DEFINE_FUNCTION(CK_RV, C_Finalize)(CK_VOID_PTR pReserved) {

	pInfo->hardwareVersion.major = (cackey_getversion() >> 16) & 0xff;
	pInfo->hardwareVersion.minor = (cackey_getversion() >> 8) & 0xff;

	pInfo->firmwareVersion.major = 0x00;
	pInfo->firmwareVersion.minor = 0x00;

	pInfo->flags = CKF_WRITE_PROTECTED | CKF_USER_PIN_INITIALIZED | CKF_TOKEN_INITIALIZED | cackey_slots[slotID].token_flags;

	if (cackey_pin_command != NULL) {
		pInfo->flags |= CKF_PROTECTED_AUTHENTICATION_PATH;
	}

	pInfo->ulMaxSessionCount = (sizeof(cackey_sessions) / sizeof(cackey_sessions[0])) - 1;
	pInfo->ulSessionCount = CK_UNAVAILABLE_INFORMATION;
	pInfo->ulMaxRwSessionCount = 0;
	pInfo->ulRwSessionCount = CK_UNAVAILABLE_INFORMATION;
	pInfo->ulMaxPinLen = 128;
	pInfo->ulMinPinLen = 0;

	CACKEY_DEBUG_PRINTF("Returning CKR_FUNCTION_NOT_SUPPORTED (%i)", CKR_FUNCTION_NOT_SUPPORTED);

	return(CKR_FUNCTION_NOT_SUPPORTED);
}

CK_DEFINE_FUNCTION(CK_RV, C_Login)(CK_SESSION_HANDLE hSession, CK_USER_TYPE userType, CK_UTF8CHAR_PTR pPin, CK_ULONG ulPinLen) {
	CK_SLOT_ID slotID;
	FILE *pinfd;
	char *pincmd, pinbuf[64], *fgets_ret;
	int mutex_retval;
	int tries_remaining;
	int login_ret;
	int pclose_ret;

	CACKEY_DEBUG_PRINTF("Called.");

	if (!cackey_initialized) {
		CACKEY_DEBUG_PRINTF("Error.  Not initialized.");

		return(CKR_CRYPTOKI_NOT_INITIALIZED);

	if (cackey_slots[slotID].active == 0) {
		CACKEY_DEBUG_PRINTF("Error. Invalid slot requested (%lu), slot not currently active", slotID);

		cackey_mutex_unlock(cackey_biglock);

		return(CKR_GENERAL_ERROR);
	}

	pincmd = cackey_pin_command;
	if (pincmd != NULL) {
		CACKEY_DEBUG_PRINTF("CACKEY_PIN_COMMAND = %s", pincmd);

		if (pPin != NULL) {
			CACKEY_DEBUG_PRINTF("Protected authentication path in effect and PIN provided !?");
		}

		pinfd = popen(pincmd, "r");
		if (pinfd == NULL) {
			CACKEY_DEBUG_PRINTF("Error.  %s: Unable to run", pincmd);

			cackey_mutex_unlock(cackey_biglock);

			CACKEY_DEBUG_PRINTF("Returning CKR_PIN_INCORRECT (%i)", (int) CKR_PIN_INCORRECT);

			return(CKR_PIN_INCORRECT);
		}

		fgets_ret = fgets(pinbuf, sizeof(pinbuf), pinfd);
		if (fgets_ret == NULL) {
			pinbuf[0] = '\0';
		}

		pclose_ret = pclose(pinfd);
		if (pclose_ret != 0) {
			CACKEY_DEBUG_PRINTF("Error.  %s: exited with non-zero status of %i", pincmd, pclose_ret);

			cackey_mutex_unlock(cackey_biglock);

			CACKEY_DEBUG_PRINTF("Returning CKR_PIN_INCORRECT (%i)", (int) CKR_PIN_INCORRECT);

			return(CKR_PIN_INCORRECT);
		}

		if (strlen(pinbuf) < 1) {
			CACKEY_DEBUG_PRINTF("Error.  %s: returned no data", pincmd);

			cackey_mutex_unlock(cackey_biglock);

			CACKEY_DEBUG_PRINTF("Returning CKR_PIN_INCORRECT (%i)", (int) CKR_PIN_INCORRECT);

			return(CKR_PIN_INCORRECT);
		}

		if (pinbuf[strlen(pinbuf) - 1] == '\n') {
			pinbuf[strlen(pinbuf) - 1] = '\0';
		}

		pPin = (CK_UTF8CHAR_PTR) pinbuf;
		ulPinLen = strlen(pinbuf);
	}

	login_ret = cackey_login(&cackey_slots[slotID], pPin, ulPinLen, &tries_remaining);
	if (login_ret != CACKEY_PCSC_S_OK) {
		cackey_mutex_unlock(cackey_biglock);

		if (login_ret == CACKEY_PCSC_E_LOCKED) {
			CACKEY_DEBUG_PRINTF("Error.  Token is locked.");

			cackey_slots[slotID].token_flags |= CKF_USER_PIN_LOCKED;

			CACKEY_DEBUG_PRINTF("Returning CKR_PIN_LOCKED (%i)", (int) CKR_PIN_LOCKED);

			return(CKR_PIN_LOCKED);
		} else if (login_ret == CACKEY_PCSC_E_BADPIN) {
			CACKEY_DEBUG_PRINTF("Error.  Invalid PIN.");

			cackey_slots[slotID].token_flags |= CKF_USER_PIN_COUNT_LOW;

			if (tries_remaining == 1) {
				cackey_slots[slotID].token_flags |= CKF_USER_PIN_FINAL_TRY;
			}

			CACKEY_DEBUG_PRINTF("Returning CKR_PIN_INCORRECT (%i)", (int) CKR_PIN_INCORRECT);

			return(CKR_PIN_INCORRECT);
		}

		CACKEY_DEBUG_PRINTF("Error.  Unknown error returned from cackey_login() (%i)", login_ret);

		return(CKR_GENERAL_ERROR);

], [
	dodcertsonhwslots=no
])

if ! test "${dodcertsonhwslots}" = 'no'; then
	AC_DEFINE(CACKEY_CARD_SLOT_INCLUDE_EXTRA_CERTS, [1], [Specify that DoD certificates should be made available on hardware token slots])
fi

dnl Option to hard-code a command to run to request a PIN (enabling protected authentication path)
AC_ARG_WITH(pin-command, AC_HELP_STRING([--with-pin-command=<command>], [Specify a command to run to request a PIN from the user.  The user may override this with the CACKEY_PIN_COMMAND environment variable.]), [
	pincommand="${withval}"
], [
	pincommand="no"
])

AC_ARG_WITH(pin-command-x, AC_HELP_STRING([--with-pin-command-x=<command>], [Same as --with-pin-command, but only sets Protected Authentication Path if the DISPLAY environment variable is set]), [
	pincommandxonly="${withval}"
], [
	pincommandxonly="no"
])

if ! test "${pincommand}" = 'no'; then
	AC_DEFINE_UNQUOTED(CACKEY_PIN_COMMAND_DEFAULT, [$pincommand], [Command to run to prompt user for PIN])
fi

if ! test "${pincommandxonly}" = 'no'; then
	AC_DEFINE_UNQUOTED(CACKEY_PIN_COMMAND_XONLY_DEFAULT, [$pincommandxonly], [Command to run to prompt user for PIN only if DISPLAY environment variable is set])
fi

dnl Set version script, to limit the scope of symbols
DC_SETVERSIONSCRIPT(libcackey.vers, libcackey.syms)

dnl Upate LDFLAGS to include setting the run-time linker path to the same as our compile-time linker
DC_SYNC_RPATH

	chk_rv = C_OpenSession(slots[0], CKF_SERIAL_SESSION, NULL, NULL, &hSession);
	if (chk_rv == CKR_OK) {
		chk_rv = C_GetTokenInfo(slots[0], &tokenInfo);
		if (chk_rv != CKR_OK) {
			return(1);
		}

		if ((tokenInfo.flags & CKF_LOGIN_REQUIRED) == CKF_LOGIN_REQUIRED && (tokenInfo.flags & CKF_PROTECTED_AUTHENTICATION_PATH) == 0) {
			fgets_ret = NULL;

			while (fgets_ret == NULL) {
				printf("** ENTER PIN: ");
				fflush(stdout);

				fgets_ret = fgets((char *) user_pin, sizeof(user_pin), stdin);