/ext/session/session.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Sascha Schumann <sascha@schumann.cx>                        |
   |          Andrei Zmievski <andrei@php.net>                            |
   +----------------------------------------------------------------------+
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"

#ifdef PHP_WIN32
# include "win32/winutil.h"
# include "win32/time.h"
#else
# include <sys/time.h>
#endif

#include <sys/stat.h>
#include <fcntl.h>

#include "php_ini.h"
#include "SAPI.h"
#include "rfc1867.h"
#include "php_variables.h"
#include "php_session.h"
#include "session_arginfo.h"
#include "ext/standard/php_random.h"
#include "ext/standard/php_var.h"
#include "ext/date/php_date.h"
#include "ext/standard/php_lcg.h"
#include "ext/standard/url_scanner_ex.h"
#include "ext/standard/info.h"
#include "zend_smart_str.h"
#include "ext/standard/url.h"
#include "ext/standard/basic_functions.h"
#include "ext/standard/head.h"

#include "mod_files.h"
#include "mod_user.h"

#ifdef HAVE_LIBMM
#include "mod_mm.h"
#endif

PHPAPI ZEND_DECLARE_MODULE_GLOBALS(ps)

static int php_session_rfc1867_callback(unsigned int event, void *event_data, void **extra);
static int (*php_session_rfc1867_orig_callback)(unsigned int event, void *event_data, void **extra);
static void php_session_track_init(void);

/* SessionHandler class */
zend_class_entry *php_session_class_entry;

/* SessionHandlerInterface */
zend_class_entry *php_session_iface_entry;

/* SessionIdInterface */
zend_class_entry *php_session_id_iface_entry;

/* SessionUpdateTimestampInterface */
zend_class_entry *php_session_update_timestamp_iface_entry;

#define PS_MAX_SID_LENGTH 256

/* ***********
   * Helpers *
   *********** */

#define IF_SESSION_VARS() \
	if (Z_ISREF_P(&PS(http_session_vars)) && Z_TYPE_P(Z_REFVAL(PS(http_session_vars))) == IS_ARRAY)

#define SESSION_CHECK_ACTIVE_STATE	\
	if (PS(session_status) == php_session_active) {	\
		php_error_docref(NULL, E_WARNING, "Session ini settings cannot be changed when a session is active");	\
		return FAILURE;	\
	}

#define SESSION_CHECK_OUTPUT_STATE										\
	if (SG(headers_sent) && stage != ZEND_INI_STAGE_DEACTIVATE) {												\
		php_error_docref(NULL, E_WARNING, "Session ini settings cannot be changed after headers have already been sent");	\
		return FAILURE;													\
	}

#define APPLY_TRANS_SID (PS(use_trans_sid) && !PS(use_only_cookies))

static int php_session_send_cookie(void);
static int php_session_abort(void);

/* Initialized in MINIT, readonly otherwise. */
static int my_module_number = 0;

/* Dispatched by RINIT and by php_session_destroy */
static inline void php_rinit_session_globals(void) /* {{{ */
{
	/* Do NOT init PS(mod_user_names) here! */
	/* TODO: These could be moved to MINIT and removed. These should be initialized by php_rshutdown_session_globals() always when execution is finished. */
	PS(id) = NULL;
	PS(session_status) = php_session_none;
	PS(in_save_handler) = 0;
	PS(set_handler) = 0;
	PS(mod_data) = NULL;
	PS(mod_user_is_open) = 0;
	PS(define_sid) = 1;
	PS(session_vars) = NULL;
	PS(module_number) = my_module_number;
	ZVAL_UNDEF(&PS(http_session_vars));
}
/* }}} */

/* Dispatched by RSHUTDOWN and by php_session_destroy */
static inline void php_rshutdown_session_globals(void) /* {{{ */
{
	/* Do NOT destroy PS(mod_user_names) here! */
	if (!Z_ISUNDEF(PS(http_session_vars))) {
		zval_ptr_dtor(&PS(http_session_vars));
		ZVAL_UNDEF(&PS(http_session_vars));
	}
	if (PS(mod_data) || PS(mod_user_implemented)) {
		zend_try {
			PS(mod)->s_close(&PS(mod_data));
		} zend_end_try();
	}
	if (PS(id)) {
		zend_string_release_ex(PS(id), 0);
		PS(id) = NULL;
	}

	if (PS(session_vars)) {
		zend_string_release_ex(PS(session_vars), 0);
		PS(session_vars) = NULL;
	}

	/* User save handlers may end up directly here by misuse, bugs in user script, etc. */
	/* Set session status to prevent error while restoring save handler INI value. */
	PS(session_status) = php_session_none;
}
/* }}} */

PHPAPI int php_session_destroy(void) /* {{{ */
{
	int retval = SUCCESS;

	if (PS(session_status) != php_session_active) {
		php_error_docref(NULL, E_WARNING, "Trying to destroy uninitialized session");
		return FAILURE;
	}

	if (PS(id) && PS(mod)->s_destroy(&PS(mod_data), PS(id)) == FAILURE) {
		retval = FAILURE;
		if (!EG(exception)) {
			php_error_docref(NULL, E_WARNING, "Session object destruction failed");
		}
	}

	php_rshutdown_session_globals();
	php_rinit_session_globals();

	return retval;
}
/* }}} */

PHPAPI void php_add_session_var(zend_string *name) /* {{{ */
{
	IF_SESSION_VARS() {
		zval *sess_var = Z_REFVAL(PS(http_session_vars));
		SEPARATE_ARRAY(sess_var);
		if (!zend_hash_exists(Z_ARRVAL_P(sess_var), name)) {
			zval empty_var;
			ZVAL_NULL(&empty_var);
			zend_hash_update(Z_ARRVAL_P(sess_var), name, &empty_var);
		}
	}
}
/* }}} */

PHPAPI zval* php_set_session_var(zend_string *name, zval *state_val, php_unserialize_data_t *var_hash) /* {{{ */
{
	IF_SESSION_VARS() {
		zval *sess_var = Z_REFVAL(PS(http_session_vars));
		SEPARATE_ARRAY(sess_var);
		return zend_hash_update(Z_ARRVAL_P(sess_var), name, state_val);
	}
	return NULL;
}
/* }}} */

PHPAPI zval* php_get_session_var(zend_string *name) /* {{{ */
{
	IF_SESSION_VARS() {
		return zend_hash_find(Z_ARRVAL_P(Z_REFVAL(PS(http_session_vars))), name);
	}
	return NULL;
}
/* }}} */

static void php_session_track_init(void) /* {{{ */
{
	zval session_vars;
	zend_string *var_name = zend_string_init("_SESSION", sizeof("_SESSION") - 1, 0);
	/* Unconditionally destroy existing array -- possible dirty data */
	zend_delete_global_variable(var_name);

	if (!Z_ISUNDEF(PS(http_session_vars))) {
		zval_ptr_dtor(&PS(http_session_vars));
	}

	array_init(&session_vars);
	ZVAL_NEW_REF(&PS(http_session_vars), &session_vars);
	Z_ADDREF_P(&PS(http_session_vars));
	zend_hash_update_ind(&EG(symbol_table), var_name, &PS(http_session_vars));
	zend_string_release_ex(var_name, 0);
}
/* }}} */

static zend_string *php_session_encode(void) /* {{{ */
{
	IF_SESSION_VARS() {
		if (!PS(serializer)) {
			php_error_docref(NULL, E_WARNING, "Unknown session.serialize_handler. Failed to encode session object");
			return NULL;
		}
		return PS(serializer)->encode();
	} else {
		php_error_docref(NULL, E_WARNING, "Cannot encode non-existent session");
	}
	return NULL;
}
/* }}} */

static int php_session_decode(zend_string *data) /* {{{ */
{
	if (!PS(serializer)) {
		php_error_docref(NULL, E_WARNING, "Unknown session.serialize_handler. Failed to decode session object");
		return FAILURE;
	}
	if (PS(serializer)->decode(ZSTR_VAL(data), ZSTR_LEN(data)) == FAILURE) {
		php_session_destroy();
		php_session_track_init();
		php_error_docref(NULL, E_WARNING, "Failed to decode session object. Session has been destroyed");
		return FAILURE;
	}
	return SUCCESS;
}
/* }}} */

/*
 * Note that we cannot use the BASE64 alphabet here, because
 * it contains "/" and "+": both are unacceptable for simple inclusion
 * into URLs.
 */

static const char hexconvtab[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,-";

static void bin_to_readable(unsigned char *in, size_t inlen, char *out, size_t outlen, char nbits) /* {{{ */
{
	unsigned char *p, *q;
	unsigned short w;
	int mask;
	int have;

	p = (unsigned char *)in;
	q = (unsigned char *)in + inlen;

	w = 0;
	have = 0;
	mask = (1 << nbits) - 1;

	while (outlen--) {
		if (have < nbits) {
			if (p < q) {
				w |= *p++ << have;
				have += 8;
			} else {
				/* Should never happen. Input must be large enough. */
				ZEND_UNREACHABLE();
				break;
			}
		}

		/* consume nbits */
		*out++ = hexconvtab[w & mask];
		w >>= nbits;
		have -= nbits;
	}

	*out = '\0';
}
/* }}} */

#define PS_EXTRA_RAND_BYTES 60

PHPAPI zend_string *php_session_create_id(PS_CREATE_SID_ARGS) /* {{{ */
{
	unsigned char rbuf[PS_MAX_SID_LENGTH + PS_EXTRA_RAND_BYTES];
	zend_string *outid;

	/* It would be enough to read ceil(sid_length * sid_bits_per_character / 8) bytes here.
	 * We read sid_length bytes instead for simplicity. */
	/* Read additional PS_EXTRA_RAND_BYTES just in case CSPRNG is not safe enough */
	if (php_random_bytes_throw(rbuf, PS(sid_length) + PS_EXTRA_RAND_BYTES) == FAILURE) {
		return NULL;
	}

	outid = zend_string_alloc(PS(sid_length), 0);
	bin_to_readable(
		rbuf, PS(sid_length),
		ZSTR_VAL(outid), ZSTR_LEN(outid),
		(char)PS(sid_bits_per_character));

	return outid;
}
/* }}} */

/* Default session id char validation function allowed by ps_modules.
 * If you change the logic here, please also update the error message in
 * ps_modules appropriately */
PHPAPI int php_session_valid_key(const char *key) /* {{{ */
{
	size_t len;
	const char *p;
	char c;
	int ret = SUCCESS;

	for (p = key; (c = *p); p++) {
		/* valid characters are a..z,A..Z,0..9 */
		if (!((c >= 'a' && c <= 'z')
				|| (c >= 'A' && c <= 'Z')
				|| (c >= '0' && c <= '9')
				|| c == ','
				|| c == '-')) {
			ret = FAILURE;
			break;
		}
	}

	len = p - key;

	/* Somewhat arbitrary length limit here, but should be way more than
	   anyone needs and avoids file-level warnings later on if we exceed MAX_PATH */
	if (len == 0 || len > PS_MAX_SID_LENGTH) {
		ret = FAILURE;
	}

	return ret;
}
/* }}} */


static zend_long php_session_gc(bool immediate) /* {{{ */
{
	int nrand;
	zend_long num = -1;

	/* GC must be done before reading session data. */
	if ((PS(mod_data) || PS(mod_user_implemented))) {
		if (immediate) {
			PS(mod)->s_gc(&PS(mod_data), PS(gc_maxlifetime), &num);
			return num;
		}
		nrand = (zend_long) ((float) PS(gc_divisor) * php_combined_lcg());
		if (PS(gc_probability) > 0 && nrand < PS(gc_probability)) {
			PS(mod)->s_gc(&PS(mod_data), PS(gc_maxlifetime), &num);
		}
	}
	return num;
} /* }}} */

static int php_session_initialize(void) /* {{{ */
{
	zend_string *val = NULL;

	PS(session_status) = php_session_active;

	if (!PS(mod)) {
		PS(session_status) = php_session_disabled;
		php_error_docref(NULL, E_WARNING, "No storage module chosen - failed to initialize session");
		return FAILURE;
	}

	/* Open session handler first */
	if (PS(mod)->s_open(&PS(mod_data), PS(save_path), PS(session_name)) == FAILURE
		/* || PS(mod_data) == NULL */ /* FIXME: open must set valid PS(mod_data) with success */
	) {
		php_session_abort();
		if (!EG(exception)) {
			php_error_docref(NULL, E_WARNING, "Failed to initialize storage module: %s (path: %s)", PS(mod)->s_name, PS(save_path));
		}
		return FAILURE;
	}

	/* If there is no ID, use session module to create one */
	if (!PS(id) || !ZSTR_VAL(PS(id))[0]) {
		if (PS(id)) {
			zend_string_release_ex(PS(id), 0);
		}
		PS(id) = PS(mod)->s_create_sid(&PS(mod_data));
		if (!PS(id)) {
			php_session_abort();
			if (!EG(exception)) {
				zend_throw_error(NULL, "Failed to create session ID: %s (path: %s)", PS(mod)->s_name, PS(save_path));
			}
			return FAILURE;
		}
		if (PS(use_cookies)) {
			PS(send_cookie) = 1;
		}
	} else if (PS(use_strict_mode) && PS(mod)->s_validate_sid &&
		PS(mod)->s_validate_sid(&PS(mod_data), PS(id)) == FAILURE
	) {
		if (PS(id)) {
			zend_string_release_ex(PS(id), 0);
		}
		PS(id) = PS(mod)->s_create_sid(&PS(mod_data));
		if (!PS(id)) {
			PS(id) = php_session_create_id(NULL);
		}
		if (PS(use_cookies)) {
			PS(send_cookie) = 1;
		}
	}

	if (php_session_reset_id() == FAILURE) {
		php_session_abort();
		return FAILURE;
	}

	/* Read data */
	php_session_track_init();
	if (PS(mod)->s_read(&PS(mod_data), PS(id), &val, PS(gc_maxlifetime)) == FAILURE) {
		php_session_abort();
		/* FYI: Some broken save handlers return FAILURE for non-existent session ID, this is incorrect */
		if (!EG(exception)) {
			php_error_docref(NULL, E_WARNING, "Failed to read session data: %s (path: %s)", PS(mod)->s_name, PS(save_path));
		}
		return FAILURE;
	}

	/* GC must be done after read */
	php_session_gc(0);

	if (PS(session_vars)) {
		zend_string_release_ex(PS(session_vars), 0);
		PS(session_vars) = NULL;
	}
	if (val) {
		if (PS(lazy_write)) {
			PS(session_vars) = zend_string_copy(val);
		}
		php_session_decode(val);
		zend_string_release_ex(val, 0);
	}
	return SUCCESS;
}
/* }}} */

static void php_session_save_current_state(int write) /* {{{ */
{
	int ret = FAILURE;

	if (write) {
		IF_SESSION_VARS() {
			if (PS(mod_data) || PS(mod_user_implemented)) {
				zend_string *val;

				val = php_session_encode();
				if (val) {
					if (PS(lazy_write) && PS(session_vars)
						&& PS(mod)->s_update_timestamp
						&& PS(mod)->s_update_timestamp != php_session_update_timestamp
						&& zend_string_equals(val, PS(session_vars))
					) {
						ret = PS(mod)->s_update_timestamp(&PS(mod_data), PS(id), val, PS(gc_maxlifetime));
					} else {
						ret = PS(mod)->s_write(&PS(mod_data), PS(id), val, PS(gc_maxlifetime));
					}
					zend_string_release_ex(val, 0);
				} else {
					ret = PS(mod)->s_write(&PS(mod_data), PS(id), ZSTR_EMPTY_ALLOC(), PS(gc_maxlifetime));
				}
			}

			if ((ret == FAILURE) && !EG(exception)) {
				if (!PS(mod_user_implemented)) {
					php_error_docref(NULL, E_WARNING, "Failed to write session data (%s). Please "
									 "verify that the current setting of session.save_path "
									 "is correct (%s)",
									 PS(mod)->s_name,
									 PS(save_path));
				} else {
					php_error_docref(NULL, E_WARNING, "Failed to write session data using user "
									 "defined save handler. (session.save_path: %s)", PS(save_path));
				}
			}
		}
	}

	if (PS(mod_data) || PS(mod_user_implemented)) {
		PS(mod)->s_close(&PS(mod_data));
	}
}
/* }}} */

static void php_session_normalize_vars(void) /* {{{ */
{
	PS_ENCODE_VARS;

	IF_SESSION_VARS() {
		PS_ENCODE_LOOP(
			if (Z_TYPE_P(struc) == IS_PTR) {
				zval *zv = (zval *)Z_PTR_P(struc);
				ZVAL_COPY_VALUE(struc, zv);
				ZVAL_UNDEF(zv);
			}
		);
	}
}
/* }}} */

/* *************************
   * INI Settings/Handlers *
   ************************* */

static PHP_INI_MH(OnUpdateSaveHandler) /* {{{ */
{
	const ps_module *tmp;
	int err_type = E_ERROR;

	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;

	tmp = _php_find_ps_module(ZSTR_VAL(new_value));

	if (stage == ZEND_INI_STAGE_RUNTIME) {
		err_type = E_WARNING;
	}

	if (PG(modules_activated) && !tmp) {
		/* Do not output error when restoring ini options. */
		if (stage != ZEND_INI_STAGE_DEACTIVATE) {
			php_error_docref(NULL, err_type, "Session save handler \"%s\" cannot be found", ZSTR_VAL(new_value));
		}

		return FAILURE;
	}

	/* "user" save handler should not be set by user */
	if (!PS(set_handler) &&  tmp == ps_user_ptr) {
		php_error_docref(NULL, err_type, "Session save handler \"user\" cannot be set by ini_set()");
		return FAILURE;
	}

	PS(default_mod) = PS(mod);
	PS(mod) = tmp;

	return SUCCESS;
}
/* }}} */

static PHP_INI_MH(OnUpdateSerializer) /* {{{ */
{
	const ps_serializer *tmp;

	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;

	tmp = _php_find_ps_serializer(ZSTR_VAL(new_value));

	if (PG(modules_activated) && !tmp) {
		int err_type;

		if (stage == ZEND_INI_STAGE_RUNTIME) {
			err_type = E_WARNING;
		} else {
			err_type = E_ERROR;
		}

		/* Do not output error when restoring ini options. */
		if (stage != ZEND_INI_STAGE_DEACTIVATE) {
			php_error_docref(NULL, err_type, "Serialization handler \"%s\" cannot be found", ZSTR_VAL(new_value));
		}
		return FAILURE;
	}
	PS(serializer) = tmp;

	return SUCCESS;
}
/* }}} */

static PHP_INI_MH(OnUpdateTransSid) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;

	if (zend_string_equals_literal_ci(new_value, "on")) {
		PS(use_trans_sid) = (bool) 1;
	} else {
		PS(use_trans_sid) = (bool) atoi(ZSTR_VAL(new_value));
	}

	return SUCCESS;
}
/* }}} */


static PHP_INI_MH(OnUpdateSaveDir) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;

	/* Only do the safemode/open_basedir check at runtime */
	if (stage == PHP_INI_STAGE_RUNTIME || stage == PHP_INI_STAGE_HTACCESS) {
		char *p;

		if (memchr(ZSTR_VAL(new_value), '\0', ZSTR_LEN(new_value)) != NULL) {
			return FAILURE;
		}

		/* we do not use zend_memrchr() since path can contain ; itself */
		if ((p = strchr(ZSTR_VAL(new_value), ';'))) {
			char *p2;
			p++;
			if ((p2 = strchr(p, ';'))) {
				p = p2 + 1;
			}
		} else {
			p = ZSTR_VAL(new_value);
		}

		if (PG(open_basedir) && *p && php_check_open_basedir(p)) {
			return FAILURE;
		}
	}

	return OnUpdateString(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateName) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;

	/* Numeric session.name won't work at all */
	if ((!ZSTR_LEN(new_value) || is_numeric_string(ZSTR_VAL(new_value), ZSTR_LEN(new_value), NULL, NULL, 0))) {
		int err_type;

		if (stage == ZEND_INI_STAGE_RUNTIME || stage == ZEND_INI_STAGE_ACTIVATE || stage == ZEND_INI_STAGE_STARTUP) {
			err_type = E_WARNING;
		} else {
			err_type = E_ERROR;
		}

		/* Do not output error when restoring ini options. */
		if (stage != ZEND_INI_STAGE_DEACTIVATE) {
			php_error_docref(NULL, err_type, "session.name \"%s\" cannot be numeric or empty", ZSTR_VAL(new_value));
		}
		return FAILURE;
	}

	return OnUpdateStringUnempty(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateCookieLifetime) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;
	if (atol(ZSTR_VAL(new_value)) < 0) {
		php_error_docref(NULL, E_WARNING, "CookieLifetime cannot be negative");
		return FAILURE;
	}
	return OnUpdateLongGEZero(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateSessionLong) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;
	return OnUpdateLong(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateSessionString) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;
	return OnUpdateString(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateSessionBool) /* {{{ */
{
	SESSION_CHECK_OUTPUT_STATE;
	SESSION_CHECK_ACTIVE_STATE;
	return OnUpdateBool(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */


static PHP_INI_MH(OnUpdateSidLength) /* {{{ */
{
	zend_long val;
	char *endptr = NULL;

	SESSION_CHECK_OUTPUT_STATE;
	SESSION_CHECK_ACTIVE_STATE;
	val = ZEND_STRTOL(ZSTR_VAL(new_value), &endptr, 10);
	if (endptr && (*endptr == '\0')
		&& val >= 22 && val <= PS_MAX_SID_LENGTH) {
		/* Numeric value */
		PS(sid_length) = val;
		return SUCCESS;
	}

	php_error_docref(NULL, E_WARNING, "session.configuration \"session.sid_length\" must be between 22 and 256");
	return FAILURE;
}
/* }}} */

static PHP_INI_MH(OnUpdateSidBits) /* {{{ */
{
	zend_long val;
	char *endptr = NULL;

	SESSION_CHECK_OUTPUT_STATE;
	SESSION_CHECK_ACTIVE_STATE;
	val = ZEND_STRTOL(ZSTR_VAL(new_value), &endptr, 10);
	if (endptr && (*endptr == '\0')
		&& val >= 4 && val <=6) {
		/* Numeric value */
		PS(sid_bits_per_character) = val;
		return SUCCESS;
	}

	php_error_docref(NULL, E_WARNING, "session.configuration \"session.sid_bits_per_character\" must be between 4 and 6");
	return FAILURE;
}
/* }}} */


static PHP_INI_MH(OnUpdateLazyWrite) /* {{{ */
{
	SESSION_CHECK_ACTIVE_STATE;
	SESSION_CHECK_OUTPUT_STATE;
	return OnUpdateBool(entry, new_value, mh_arg1, mh_arg2, mh_arg3, stage);
}
/* }}} */



static PHP_INI_MH(OnUpdateRfc1867Freq) /* {{{ */
{
	int tmp = ZEND_ATOL(ZSTR_VAL(new_value));
	if(tmp < 0) {
		php_error_docref(NULL, E_WARNING, "session.upload_progress.freq must be greater than or equal to 0");
		return FAILURE;
	}
	if(ZSTR_LEN(new_value) > 0 && ZSTR_VAL(new_value)[ZSTR_LEN(new_value)-1] == '%') {
		if(tmp > 100) {
			php_error_docref(NULL, E_WARNING, "session.upload_progress.freq must be less than or equal to 100%%");
			return FAILURE;
		}
		PS(rfc1867_freq) = -tmp;
	} else {
		PS(rfc1867_freq) = tmp;
	}
	return SUCCESS;
} /* }}} */

/* {{{ PHP_INI */
PHP_INI_BEGIN()
	STD_PHP_INI_ENTRY("session.save_path",          "",          PHP_INI_ALL, OnUpdateSaveDir,       save_path,          php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.name",               "PHPSESSID", PHP_INI_ALL, OnUpdateName,          session_name,       php_ps_globals,    ps_globals)
	PHP_INI_ENTRY("session.save_handler",           "files",     PHP_INI_ALL, OnUpdateSaveHandler)
	STD_PHP_INI_BOOLEAN("session.auto_start",       "0",         PHP_INI_PERDIR, OnUpdateBool,       auto_start,         php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.gc_probability",     "1",         PHP_INI_ALL, OnUpdateSessionLong,          gc_probability,     php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.gc_divisor",         "100",       PHP_INI_ALL, OnUpdateSessionLong,          gc_divisor,         php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.gc_maxlifetime",     "1440",      PHP_INI_ALL, OnUpdateSessionLong,          gc_maxlifetime,     php_ps_globals,    ps_globals)
	PHP_INI_ENTRY("session.serialize_handler",      "php",       PHP_INI_ALL, OnUpdateSerializer)
	STD_PHP_INI_ENTRY("session.cookie_lifetime",    "0",         PHP_INI_ALL, OnUpdateCookieLifetime,cookie_lifetime,    php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cookie_path",        "/",         PHP_INI_ALL, OnUpdateSessionString, cookie_path,        php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cookie_domain",      "",          PHP_INI_ALL, OnUpdateSessionString, cookie_domain,      php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cookie_secure",      "0",         PHP_INI_ALL, OnUpdateSessionBool,   cookie_secure,      php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cookie_httponly",    "0",         PHP_INI_ALL, OnUpdateSessionBool,   cookie_httponly,    php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cookie_samesite",    "",          PHP_INI_ALL, OnUpdateString,        cookie_samesite,    php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.use_cookies",        "1",         PHP_INI_ALL, OnUpdateSessionBool,   use_cookies,        php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.use_only_cookies",   "1",         PHP_INI_ALL, OnUpdateSessionBool,   use_only_cookies,   php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.use_strict_mode",    "0",         PHP_INI_ALL, OnUpdateSessionBool,   use_strict_mode,    php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.referer_check",      "",          PHP_INI_ALL, OnUpdateSessionString, extern_referer_chk, php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cache_limiter",      "nocache",   PHP_INI_ALL, OnUpdateSessionString, cache_limiter,      php_ps_globals,    ps_globals)
	STD_PHP_INI_ENTRY("session.cache_expire",       "180",       PHP_INI_ALL, OnUpdateSessionLong,   cache_expire,       php_ps_globals,    ps_globals)
	PHP_INI_ENTRY("session.use_trans_sid",          "0",         PHP_INI_ALL, OnUpdateTransSid)
	PHP_INI_ENTRY("session.sid_length",             "32",        PHP_INI_ALL, OnUpdateSidLength)
	PHP_INI_ENTRY("session.sid_bits_per_character", "4",         PHP_INI_ALL, OnUpdateSidBits)
	STD_PHP_INI_BOOLEAN("session.lazy_write",       "1",         PHP_INI_ALL, OnUpdateLazyWrite,     lazy_write,         php_ps_globals,    ps_globals)

	/* Upload progress */
	STD_PHP_INI_BOOLEAN("session.upload_progress.enabled",
	                                                "1",     ZEND_INI_PERDIR, OnUpdateBool,        rfc1867_enabled, php_ps_globals, ps_globals)
	STD_PHP_INI_BOOLEAN("session.upload_progress.cleanup",
	                                                "1",     ZEND_INI_PERDIR, OnUpdateBool,        rfc1867_cleanup, php_ps_globals, ps_globals)
	STD_PHP_INI_ENTRY("session.upload_progress.prefix",
	                                     "upload_progress_", ZEND_INI_PERDIR, OnUpdateString,      rfc1867_prefix,  php_ps_globals, ps_globals)
	STD_PHP_INI_ENTRY("session.upload_progress.name",
	                          "PHP_SESSION_UPLOAD_PROGRESS", ZEND_INI_PERDIR, OnUpdateString,      rfc1867_name,    php_ps_globals, ps_globals)
	STD_PHP_INI_ENTRY("session.upload_progress.freq",  "1%", ZEND_INI_PERDIR, OnUpdateRfc1867Freq, rfc1867_freq,    php_ps_globals, ps_globals)
	STD_PHP_INI_ENTRY("session.upload_progress.min_freq",
	                                                   "1",  ZEND_INI_PERDIR, OnUpdateReal,        rfc1867_min_freq,php_ps_globals, ps_globals)

	/* Commented out until future discussion */
	/* PHP_INI_ENTRY("session.encode_sources", "globals,track", PHP_INI_ALL, NULL) */
PHP_INI_END()
/* }}} */

/* ***************
   * Serializers *
   *************** */
PS_SERIALIZER_ENCODE_FUNC(php_serialize) /* {{{ */
{
	smart_str buf = {0};
	php_serialize_data_t var_hash;

	IF_SESSION_VARS() {
		PHP_VAR_SERIALIZE_INIT(var_hash);
		php_var_serialize(&buf, Z_REFVAL(PS(http_session_vars)), &var_hash);
		PHP_VAR_SERIALIZE_DESTROY(var_hash);
	}
	return buf.s;
}
/* }}} */

PS_SERIALIZER_DECODE_FUNC(php_serialize) /* {{{ */
{
	const char *endptr = val + vallen;
	zval session_vars;
	php_unserialize_data_t var_hash;
	int result;
	zend_string *var_name = zend_string_init("_SESSION", sizeof("_SESSION") - 1, 0);

	ZVAL_NULL(&session_vars);
	PHP_VAR_UNSERIALIZE_INIT(var_hash);
	result = php_var_unserialize(
		&session_vars, (const unsigned char **)&val, (const unsigned char *)endptr, &var_hash);
	PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
	if (!result) {
		zval_ptr_dtor(&session_vars);
		ZVAL_NULL(&session_vars);
	}

	if (!Z_ISUNDEF(PS(http_session_vars))) {
		zval_ptr_dtor(&PS(http_session_vars));
	}
	if (Z_TYPE(session_vars) == IS_NULL) {
		array_init(&session_vars);
	}
	ZVAL_NEW_REF(&PS(http_session_vars), &session_vars);
	Z_ADDREF_P(&PS(http_session_vars));
	zend_hash_update_ind(&EG(symbol_table), var_name, &PS(http_session_vars));
	zend_string_release_ex(var_name, 0);
	return result || !vallen ? SUCCESS : FAILURE;
}
/* }}} */

#define PS_BIN_NR_OF_BITS 8
#define PS_BIN_UNDEF (1<<(PS_BIN_NR_OF_BITS-1))
#define PS_BIN_MAX (PS_BIN_UNDEF-1)

PS_SERIALIZER_ENCODE_FUNC(php_binary) /* {{{ */
{
	smart_str buf = {0};
	php_serialize_data_t var_hash;
	PS_ENCODE_VARS;

	PHP_VAR_SERIALIZE_INIT(var_hash);

	PS_ENCODE_LOOP(
			if (ZSTR_LEN(key) > PS_BIN_MAX) continue;
			smart_str_appendc(&buf, (unsigned char)ZSTR_LEN(key));
			smart_str_appendl(&buf, ZSTR_VAL(key), ZSTR_LEN(key));
			php_var_serialize(&buf, struc, &var_hash);
	);

	smart_str_0(&buf);
	PHP_VAR_SERIALIZE_DESTROY(var_hash);

	return buf.s;
}
/* }}} */

PS_SERIALIZER_DECODE_FUNC(php_binary) /* {{{ */
{
	const char *p;
	const char *endptr = val + vallen;
	int namelen;
	zend_string *name;
	php_unserialize_data_t var_hash;
	zval *current, rv;

	PHP_VAR_UNSERIALIZE_INIT(var_hash);

	for (p = val; p < endptr; ) {
		namelen = ((unsigned char)(*p)) & (~PS_BIN_UNDEF);

		if (namelen < 0 || namelen > PS_BIN_MAX || (p + namelen) >= endptr) {
			PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
			return FAILURE;
		}

		name = zend_string_init(p + 1, namelen, 0);
		p += namelen + 1;
		current = var_tmp_var(&var_hash);

		if (php_var_unserialize(current, (const unsigned char **) &p, (const unsigned char *) endptr, &var_hash)) {
			ZVAL_PTR(&rv, current);
			php_set_session_var(name, &rv, &var_hash);
		} else {
			zend_string_release_ex(name, 0);
			php_session_normalize_vars();
			PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
			return FAILURE;
		}
		zend_string_release_ex(name, 0);
	}

	php_session_normalize_vars();
	PHP_VAR_UNSERIALIZE_DESTROY(var_hash);

	return SUCCESS;
}
/* }}} */

#define PS_DELIMITER '|'

PS_SERIALIZER_ENCODE_FUNC(php) /* {{{ */
{
	smart_str buf = {0};
	php_serialize_data_t var_hash;
	PS_ENCODE_VARS;

	PHP_VAR_SERIALIZE_INIT(var_hash);

	PS_ENCODE_LOOP(
		smart_str_appendl(&buf, ZSTR_VAL(key), ZSTR_LEN(key));
		if (memchr(ZSTR_VAL(key), PS_DELIMITER, ZSTR_LEN(key))) {
			PHP_VAR_SERIALIZE_DESTROY(var_hash);
			smart_str_free(&buf);
			return NULL;
		}
		smart_str_appendc(&buf, PS_DELIMITER);
		php_var_serialize(&buf, struc, &var_hash);
	);

	smart_str_0(&buf);

	PHP_VAR_SERIALIZE_DESTROY(var_hash);
	return buf.s;
}
/* }}} */

PS_SERIALIZER_DECODE_FUNC(php) /* {{{ */
{
	const char *p, *q;
	const char *endptr = val + vallen;
	ptrdiff_t namelen;
	zend_string *name;
	int retval = SUCCESS;
	php_unserialize_data_t var_hash;
	zval *current, rv;

	PHP_VAR_UNSERIALIZE_INIT(var_hash);

	p = val;

	while (p < endptr) {
		q = p;
		while (*q != PS_DELIMITER) {
			if (++q >= endptr) {
				retval = FAILURE;
				goto break_outer_loop;
			}
		}

		namelen = q - p;
		name = zend_string_init(p, namelen, 0);
		q++;

		current = var_tmp_var(&var_hash);
		if (php_var_unserialize(current, (const unsigned char **)&q, (const unsigned char *)endptr, &var_hash)) {
			ZVAL_PTR(&rv, current);
			php_set_session_var(name, &rv, &var_hash);
		} else {
			zend_string_release_ex(name, 0);
			retval = FAILURE;
			goto break_outer_loop;
		}
		zend_string_release_ex(name, 0);
		p = q;
	}

break_outer_loop:
	php_session_normalize_vars();

	PHP_VAR_UNSERIALIZE_DESTROY(var_hash);

	return retval;
}
/* }}} */

#define MAX_SERIALIZERS 32
#define PREDEFINED_SERIALIZERS 3

static ps_serializer ps_serializers[MAX_SERIALIZERS + 1] = {
	PS_SERIALIZER_ENTRY(php_serialize),
	PS_SERIALIZER_ENTRY(php),
	PS_SERIALIZER_ENTRY(php_binary)
};

PHPAPI int php_session_register_serializer(const char *name, zend_string *(*encode)(PS_SERIALIZER_ENCODE_ARGS), int (*decode)(PS_SERIALIZER_DECODE_ARGS)) /* {{{ */
{
	int ret = FAILURE;
	int i;

	for (i = 0; i < MAX_SERIALIZERS; i++) {
		if (ps_serializers[i].name == NULL) {
			ps_serializers[i].name = name;
			ps_serializers[i].encode = encode;
			ps_serializers[i].decode = decode;
			ps_serializers[i + 1].name = NULL;
			ret = SUCCESS;
			break;
		}
	}
	return ret;
}
/* }}} */

/* *******************
   * Storage Modules *
   ******************* */

#define MAX_MODULES 32
#define PREDEFINED_MODULES 2

static const ps_module *ps_modules[MAX_MODULES + 1] = {
	ps_files_ptr,
	ps_user_ptr
};

PHPAPI int php_session_register_module(const ps_module *ptr) /* {{{ */
{
	int ret = FAILURE;
	int i;

	for (i = 0; i < MAX_MODULES; i++) {
		if (!ps_modules[i]) {
			ps_modules[i] = ptr;
			ret = SUCCESS;
			break;
		}
	}
	return ret;
}
/* }}} */

/* Dummy PS module function */
PHPAPI int php_session_validate_sid(PS_VALIDATE_SID_ARGS) {
	return SUCCESS;
}

/* Dummy PS module function */
PHPAPI int php_session_update_timestamp(PS_UPDATE_TIMESTAMP_ARGS) {
	return SUCCESS;
}


/* ******************
   * Cache Limiters *
   ****************** */

typedef struct {
	char *name;
	void (*func)(void);
} php_session_cache_limiter_t;

#define CACHE_LIMITER(name) _php_cache_limiter_##name
#define CACHE_LIMITER_FUNC(name) static void CACHE_LIMITER(name)(void)
#define CACHE_LIMITER_ENTRY(name) { #name, CACHE_LIMITER(name) },
#define ADD_HEADER(a) sapi_add_header(a, strlen(a), 1);
#define MAX_STR 512

static const char *month_names[] = {
	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

static const char *week_days[] = {
	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
};

static inline void strcpy_gmt(char *ubuf, time_t *when) /* {{{ */
{
	char buf[MAX_STR];
	struct tm tm, *res;
	int n;

	res = php_gmtime_r(when, &tm);

	if (!res) {
		ubuf[0] = '\0';
		return;
	}

	n = slprintf(buf, sizeof(buf), "%s, %02d %s %d %02d:%02d:%02d GMT", /* SAFE */
				week_days[tm.tm_wday], tm.tm_mday,
				month_names[tm.tm_mon], tm.tm_year + 1900,
				tm.tm_hour, tm.tm_min,
				tm.tm_sec);
	memcpy(ubuf, buf, n);
	ubuf[n] = '\0';
}
/* }}} */

static inline void last_modified(void) /* {{{ */
{
	const char *path;
	zend_stat_t sb;
	char buf[MAX_STR + 1];

	path = SG(request_info).path_translated;
	if (path) {
		if (VCWD_STAT(path, &sb) == -1) {
			return;
		}

#define LAST_MODIFIED "Last-Modified: "
		memcpy(buf, LAST_MODIFIED, sizeof(LAST_MODIFIED) - 1);
		strcpy_gmt(buf + sizeof(LAST_MODIFIED) - 1, &sb.st_mtime);
		ADD_HEADER(buf);
	}
}
/* }}} */

#define EXPIRES "Expires: "
CACHE_LIMITER_FUNC(public) /* {{{ */
{
	char buf[MAX_STR + 1];
	struct timeval tv;
	time_t now;

	gettimeofday(&tv, NULL);
	now = tv.tv_sec + PS(cache_expire) * 60;
	memcpy(buf, EXPIRES, sizeof(EXPIRES) - 1);
	strcpy_gmt(buf + sizeof(EXPIRES) - 1, &now);
	ADD_HEADER(buf);

	snprintf(buf, sizeof(buf) , "Cache-Control: public, max-age=" ZEND_LONG_FMT, PS(cache_expire) * 60); /* SAFE */
	ADD_HEADER(buf);

	last_modified();
}
/* }}} */

CACHE_LIMITER_FUNC(private_no_expire) /* {{{ */
{
	char buf[MAX_STR + 1];

	snprintf(buf, sizeof(buf), "Cache-Control: private, max-age=" ZEND_LONG_FMT, PS(cache_expire) * 60); /* SAFE */
	ADD_HEADER(buf);

	last_modified();
}
/* }}} */

CACHE_LIMITER_FUNC(private) /* {{{ */
{
	ADD_HEADER("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
	CACHE_LIMITER(private_no_expire)();
}
/* }}} */

CACHE_LIMITER_FUNC(nocache) /* {{{ */
{
	ADD_HEADER("Expires: Thu, 19 Nov 1981 08:52:00 GMT");

	/* For HTTP/1.1 conforming clients */
	ADD_HEADER("Cache-Control: no-store, no-cache, must-revalidate");

	/* For HTTP/1.0 conforming clients */
	ADD_HEADER("Pragma: no-cache");
}
/* }}} */

static const php_session_cache_limiter_t php_session_cache_limiters[] = {
	CACHE_LIMITER_ENTRY(public)
	CACHE_LIMITER_ENTRY(private)
	CACHE_LIMITER_ENTRY(private_no_expire)
	CACHE_LIMITER_ENTRY(nocache)
	{0}
};

static int php_session_cache_limiter(void) /* {{{ */
{
	const php_session_cache_limiter_t *lim;

	if (PS(cache_limiter)[0] == '\0') return 0;
	if (PS(session_status) != php_session_active) return -1;

	if (SG(headers_sent)) {
		const char *output_start_filename = php_output_get_start_filename();
		int output_start_lineno = php_output_get_start_lineno();

		php_session_abort();
		if (output_start_filename) {
			php_error_docref(NULL, E_WARNING, "Session cache limiter cannot be sent after headers have already been sent (output started at %s:%d)", output_start_filename, output_start_lineno);
		} else {
			php_error_docref(NULL, E_WARNING, "Session cache limiter cannot be sent after headers have already been sent");
		}
		return -2;
	}

	for (lim = php_session_cache_limiters; lim->name; lim++) {
		if (!strcasecmp(lim->name, PS(cache_limiter))) {
			lim->func();
			return 0;
		}
	}

	return -1;
}
/* }}} */

/* *********************
   * Cookie Management *
   ********************* */

/*
 * Remove already sent session ID cookie.
 * It must be directly removed from SG(sapi_header) because sapi_add_header_ex()
 * removes all of matching cookie. i.e. It deletes all of Set-Cookie headers.
 */
static void php_session_remove_cookie(void) {
	sapi_header_struct *header;
	zend_llist *l = &SG(sapi_headers).headers;
	zend_llist_element *next;
	zend_llist_element *current;
	char *session_cookie;
	size_t session_cookie_len;
	size_t len = sizeof("Set-Cookie")-1;

	ZEND_ASSERT(strpbrk(PS(session_name), "=,; \t\r\n\013\014") == NULL);
	spprintf(&session_cookie, 0, "Set-Cookie: %s=", PS(session_name));

	session_cookie_len = strlen(session_cookie);
	current = l->head;
	while (current) {
		header = (sapi_header_struct *)(current->data);
		next = current->next;
		if (header->header_len > len && header->header[len] == ':'
			&& !strncmp(header->header, session_cookie, session_cookie_len)) {
			if (current->prev) {
				current->prev->next = next;
			} else {
				l->head = next;
			}
			if (next) {
				next->prev = current->prev;
			} else {
				l->tail = current->prev;
			}
			sapi_free_header(header);
			efree(current);
			--l->count;
		}
		current = next;
	}
	efree(session_cookie);
}

static int php_session_send_cookie(void) /* {{{ */
{
	smart_str ncookie = {0};
	zend_string *date_fmt = NULL;
	zend_string *e_id;

	if (SG(headers_sent)) {
		const char *output_start_filename = php_output_get_start_filename();
		int output_start_lineno = php_output_get_start_lineno();

		if (output_start_filename) {
			php_error_docref(NULL, E_WARNING, "Session cookie cannot be sent after headers have already been sent (output started at %s:%d)", output_start_filename, output_start_lineno);
		} else {
			php_error_docref(NULL, E_WARNING, "Session cookie cannot be sent after headers have already been sent");
		}
		return FAILURE;
	}

	/* Prevent broken Set-Cookie header, because the session_name might be user supplied */
	if (strpbrk(PS(session_name), "=,; \t\r\n\013\014") != NULL) {   /* man isspace for \013 and \014 */
		php_error_docref(NULL, E_WARNING, "session.name cannot contain any of the following '=,; \\t\\r\\n\\013\\014'");
		return FAILURE;
	}

	/* URL encode id because it might be user supplied */
	e_id = php_url_encode(ZSTR_VAL(PS(id)), ZSTR_LEN(PS(id)));

	smart_str_appendl(&ncookie, "Set-Cookie: ", sizeof("Set-Cookie: ")-1);
	smart_str_appendl(&ncookie, PS(session_name), strlen(PS(session_name)));
	smart_str_appendc(&ncookie, '=');
	smart_str_appendl(&ncookie, ZSTR_VAL(e_id), ZSTR_LEN(e_id));

	zend_string_release_ex(e_id, 0);

	if (PS(cookie_lifetime) > 0) {
		struct timeval tv;
		time_t t;

		gettimeofday(&tv, NULL);
		t = tv.tv_sec + PS(cookie_lifetime);

		if (t > 0) {
			date_fmt = php_format_date("D, d-M-Y H:i:s T", sizeof("D, d-M-Y H:i:s T")-1, t, 0);
			smart_str_appends(&ncookie, COOKIE_EXPIRES);
			smart_str_appendl(&ncookie, ZSTR_VAL(date_fmt), ZSTR_LEN(date_fmt));
			zend_string_release_ex(date_fmt, 0);

			smart_str_appends(&ncookie, COOKIE_MAX_AGE);
			smart_str_append_long(&ncookie, PS(cookie_lifetime));
		}
	}

	if (PS(cookie_path)[0]) {
		smart_str_appends(&ncookie, COOKIE_PATH);
		smart_str_appends(&ncookie, PS(cookie_path));
	}

	if (PS(cookie_domain)[0]) {
		smart_str_appends(&ncookie, COOKIE_DOMAIN);
		smart_str_appends(&ncookie, PS(cookie_domain));
	}

	if (PS(cookie_secure)) {
		smart_str_appends(&ncookie, COOKIE_SECURE);
	}

	if (PS(cookie_httponly)) {
		smart_str_appends(&ncookie, COOKIE_HTTPONLY);
	}

	if (PS(cookie_samesite)[0]) {
		smart_str_appends(&ncookie, COOKIE_SAMESITE);
		smart_str_appends(&ncookie, PS(cookie_samesite));
	}

	smart_str_0(&ncookie);

	php_session_remove_cookie(); /* remove already sent session ID cookie */
	/*	'replace' must be 0 here, else a previous Set-Cookie
		header, probably sent with setcookie() will be replaced! */
	sapi_add_header_ex(estrndup(ZSTR_VAL(ncookie.s), ZSTR_LEN(ncookie.s)), ZSTR_LEN(ncookie.s), 0, 0);
	smart_str_free(&ncookie);

	return SUCCESS;
}
/* }}} */

PHPAPI const ps_module *_php_find_ps_module(const char *name) /* {{{ */
{
	const ps_module *ret = NULL;
	const ps_module **mod;
	int i;

	for (i = 0, mod = ps_modules; i < MAX_MODULES; i++, mod++) {
		if (*mod && !strcasecmp(name, (*mod)->s_name)) {
			ret = *mod;
			break;
		}
	}
	return ret;
}
/* }}} */

PHPAPI const ps_serializer *_php_find_ps_serializer(const char *name) /* {{{ */
{
	const ps_serializer *ret = NULL;
	const ps_serializer *mod;

	for (mod = ps_serializers; mod->name; mod++) {
		if (!strcasecmp(name, mod->name)) {
			ret = mod;
			break;
		}
	}
	return ret;
}
/* }}} */

static void ppid2sid(zval *ppid) {
	ZVAL_DEREF(ppid);
	if (Z_TYPE_P(ppid) == IS_STRING) {
		PS(id) = zend_string_init(Z_STRVAL_P(ppid), Z_STRLEN_P(ppid), 0);
		PS(send_cookie) = 0;
	} else {
		PS(id) = NULL;
		PS(send_cookie) = 1;
	}
}


PHPAPI int php_session_reset_id(void) /* {{{ */
{
	int module_number = PS(module_number);
	zval *sid, *data, *ppid;
	bool apply_trans_sid;

	if (!PS(id)) {
		php_error_docref(NULL, E_WARNING, "Cannot set session ID - session ID is not initialized");
		return FAILURE;
	}

	if (PS(use_cookies) && PS(send_cookie)) {
		php_session_send_cookie();
		PS(send_cookie) = 0;
	}

	/* If the SID constant exists, destroy it. */
	/* We must not delete any items in EG(zend_constants) */
	/* zend_hash_str_del(EG(zend_constants), "sid", sizeof("sid") - 1); */
	sid = zend_get_constant_str("SID", sizeof("SID") - 1);

	if (PS(define_sid)) {
		smart_str var = {0};

		smart_str_appends(&var, PS(session_name));
		smart_str_appendc(&var, '=');
		smart_str_appends(&var, ZSTR_VAL(PS(id)));
		smart_str_0(&var);
		if (sid) {
			zval_ptr_dtor_str(sid);
			ZVAL_NEW_STR(sid, var.s);
		} else {
			REGISTER_STRINGL_CONSTANT("SID", ZSTR_VAL(var.s), ZSTR_LEN(var.s), 0);
			smart_str_free(&var);
		}
	} else {
		if (sid) {
			zval_ptr_dtor_str(sid);
			ZVAL_EMPTY_STRING(sid);
		} else {
			REGISTER_STRINGL_CONSTANT("SID", "", 0, 0);
		}
	}

	/* Apply trans sid if sid cookie is not set */
	apply_trans_sid = 0;
	if (APPLY_TRANS_SID) {
		apply_trans_sid = 1;
		if (PS(use_cookies) &&
			(data = zend_hash_str_find(&EG(symbol_table), "_COOKIE", sizeof("_COOKIE") - 1))) {
			ZVAL_DEREF(data);
			if (Z_TYPE_P(data) == IS_ARRAY &&
				(ppid = zend_hash_str_find(Z_ARRVAL_P(data), PS(session_name), strlen(PS(session_name))))) {
				ZVAL_DEREF(ppid);
				apply_trans_sid = 0;
			}
		}
	}
	if (apply_trans_sid) {
		zend_string *sname;
		sname = zend_string_init(PS(session_name), strlen(PS(session_name)), 0);
		php_url_scanner_reset_session_var(sname, 1); /* This may fail when session name has changed */
		zend_string_release_ex(sname, 0);
		php_url_scanner_add_session_var(PS(session_name), strlen(PS(session_name)), ZSTR_VAL(PS(id)), ZSTR_LEN(PS(id)), 1);
	}
	return SUCCESS;
}
/* }}} */


PHPAPI int php_session_start(void) /* {{{ */
{
	zval *ppid;
	zval *data;
	char *p, *value;
	size_t lensess;

	switch (PS(session_status)) {
		case php_session_active:
			php_error(E_NOTICE, "Ignoring session_start() because a session has already been started");
			return FAILURE;
			break;

		case php_session_disabled:
			value = zend_ini_string("session.save_handler", sizeof("session.save_handler") - 1, 0);
			if (!PS(mod) && value) {
				PS(mod) = _php_find_ps_module(value);
				if (!PS(mod)) {
					php_error_docref(NULL, E_WARNING, "Cannot find session save handler \"%s\" - session startup failed", value);
					return FAILURE;
				}
			}
			value = zend_ini_string("session.serialize_handler", sizeof("session.serialize_handler") - 1, 0);
			if (!PS(serializer) && value) {
				PS(serializer) = _php_find_ps_serializer(value);
				if (!PS(serializer)) {
					php_error_docref(NULL, E_WARNING, "Cannot find session serialization handler \"%s\" - session startup failed", value);
					return FAILURE;
				}
			}
			PS(session_status) = php_session_none;
			ZEND_FALLTHROUGH;

		case php_session_none:
		default:
			/* Setup internal flags */
			PS(define_sid) = !PS(use_only_cookies); /* SID constant is defined when non-cookie ID is used */
			PS(send_cookie) = PS(use_cookies) || PS(use_only_cookies);
	}

	lensess = strlen(PS(session_name));

	/*
	 * Cookies are preferred, because initially cookie and get
	 * variables will be available.
	 * URL/POST session ID may be used when use_only_cookies=Off.
	 * session.use_strice_mode=On prevents session adoption.
	 * Session based file upload progress uses non-cookie ID.
	 */

	if (!PS(id)) {
		if (PS(use_cookies) && (data = zend_hash_str_find(&EG(symbol_table), "_COOKIE", sizeof("_COOKIE") - 1))) {
			ZVAL_DEREF(data);
			if (Z_TYPE_P(data) == IS_ARRAY && (ppid = zend_hash_str_find(Z_ARRVAL_P(data), PS(session_name), lensess))) {
				ppid2sid(ppid);
				PS(send_cookie) = 0;
				PS(define_sid) = 0;
			}
		}
		/* Initialize session ID from non cookie values */
		if (!PS(use_only_cookies)) {
			if (!PS(id) && (data = zend_hash_str_find(&EG(symbol_table), "_GET", sizeof("_GET") - 1))) {
				ZVAL_DEREF(data);
				if (Z_TYPE_P(data) == IS_ARRAY && (ppid = zend_hash_str_find(Z_ARRVAL_P(data), PS(session_name), lensess))) {
					ppid2sid(ppid);
				}
			}
			if (!PS(id) && (data = zend_hash_str_find(&EG(symbol_table), "_POST", sizeof("_POST") - 1))) {
				ZVAL_DEREF(data);
				if (Z_TYPE_P(data) == IS_ARRAY && (ppid = zend_hash_str_find(Z_ARRVAL_P(data), PS(session_name), lensess))) {
					ppid2sid(ppid);
				}
			}
			/* Check the REQUEST_URI symbol for a string of the form
			 * '<session-name>=<session-id>' to allow URLs of the form
			 * http://yoursite/<session-name>=<session-id>/script.php */
			if (!PS(id) && zend_is_auto_global(ZSTR_KNOWN(ZEND_STR_AUTOGLOBAL_SERVER)) == SUCCESS &&
				(data = zend_hash_str_find(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]), "REQUEST_URI", sizeof("REQUEST_URI") - 1)) &&
				Z_TYPE_P(data) == IS_STRING &&
				(p = strstr(Z_STRVAL_P(data), PS(session_name))) &&
				p[lensess] == '='
				) {
				char *q;
				p += lensess + 1;
				if ((q = strpbrk(p, "/?\\"))) {
					PS(id) = zend_string_init(p, q - p, 0);
				}
			}
			/* Check whether the current request was referred to by
			 * an external site which invalidates the previously found id. */
			if (PS(id) && PS(extern_referer_chk)[0] != '\0' &&
				!Z_ISUNDEF(PG(http_globals)[TRACK_VARS_SERVER]) &&
				(data = zend_hash_str_find(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]), "HTTP_REFERER", sizeof("HTTP_REFERER") - 1)) &&
				Z_TYPE_P(data) == IS_STRING &&
				Z_STRLEN_P(data) != 0 &&
				strstr(Z_STRVAL_P(data), PS(extern_referer_chk)) == NULL
			) {
				zend_string_release_ex(PS(id), 0);
				PS(id) = NULL;
			}
		}
	}

	/* Finally check session id for dangerous characters
	 * Security note: session id may be embedded in HTML pages.*/
	if (PS(id) && strpbrk(ZSTR_VAL(PS(id)), "\r\n\t <>'\"\\")) {
		zend_string_release_ex(PS(id), 0);
		PS(id) = NULL;
	}

	if (php_session_initialize() == FAILURE
		|| php_session_cache_limiter() == -2) {
		PS(session_status) = php_session_none;
		if (PS(id)) {
			zend_string_release_ex(PS(id), 0);
			PS(id) = NULL;
		}
		return FAILURE;
	}
	return SUCCESS;
}
/* }}} */

PHPAPI int php_session_flush(int write) /* {{{ */
{
	if (PS(session_status) == php_session_active) {
		php_session_save_current_state(write);
		PS(session_status) = php_session_none;
		return SUCCESS;
	}
	return FAILURE;
}
/* }}} */

static int php_session_abort(void) /* {{{ */
{
	if (PS(session_status) == php_session_active) {
		if (PS(mod_data) || PS(mod_user_implemented)) {
			PS(mod)->s_close(&PS(mod_data));
		}
		PS(session_status) = php_session_none;
		return SUCCESS;
	}
	return FAILURE;
}
/* }}} */

static int php_session_reset(void) /* {{{ */
{
	if (PS(session_status) == php_session_active
		&& php_session_initialize() == SUCCESS) {
		return SUCCESS;
	}
	return FAILURE;
}
/* }}} */


/* This API is not used by any PHP modules including session currently.
   session_adapt_url() may be used to set Session ID to target url without
   starting "URL-Rewriter" output handler. */
PHPAPI void session_adapt_url(const char *url, size_t url_len, char **new_url, size_t *new_len) /* {{{ */
{
	if (APPLY_TRANS_SID && (PS(session_status) == php_session_active)) {
		*new_url = php_url_scanner_adapt_single_url(url, url_len, PS(session_name), ZSTR_VAL(PS(id)), new_len, 1);
	}
}
/* }}} */

/* ********************************
   * Userspace exported functions *
   ******************************** */

/* {{{ session_set_cookie_params(array options)
   Set session cookie parameters */
PHP_FUNCTION(session_set_cookie_params)
{
	HashTable *options_ht;
	zend_long lifetime_long;
	zend_string *lifetime = NULL, *path = NULL, *domain = NULL, *samesite = NULL;
	bool secure = 0, secure_null = 1;
	bool httponly = 0, httponly_null = 1;
	zend_string *ini_name;
	int result;
	int found = 0;

	if (!PS(use_cookies)) {
		return;
	}

	ZEND_PARSE_PARAMETERS_START(1, 5)
		Z_PARAM_ARRAY_HT_OR_LONG(options_ht, lifetime_long)
		Z_PARAM_OPTIONAL
		Z_PARAM_STR_OR_NULL(path)
		Z_PARAM_STR_OR_NULL(domain)
		Z_PARAM_BOOL_OR_NULL(secure, secure_null)
		Z_PARAM_BOOL_OR_NULL(httponly, httponly_null)
	ZEND_PARSE_PARAMETERS_END();

	if (PS(session_status) == php_session_active) {
		php_error_docref(NULL, E_WARNING, "Session cookie parameters cannot be changed when a session is active");
		RETURN_FALSE;
	}

	if (SG(headers_sent)) {
		php_error_docref(NULL, E_WARNING, "Session cookie parameters cannot be changed after headers have already been sent");
		RETURN_FALSE;
	}

	if (options_ht) {
		zend_string *key;
		zval *value;

		if (path) {
			zend_argument_value_error(2, "must be null when argument #1 ($lifetime_or_options) is an array");
			RETURN_THROWS();
		}

		if (domain) {
			zend_argument_value_error(3, "must be null when argument #1 ($lifetime_or_options) is an array");
			RETURN_THROWS();
		}

		if (!secure_null) {
			zend_argument_value_error(4, "must be null when argument #1 ($lifetime_or_options) is an array");
			RETURN_THROWS();
		}

		if (!httponly_null) {
			zend_argument_value_error(5, "must be null when argument #1 ($lifetime_or_options) is an array");
			RETURN_THROWS();
		}
		ZEND_HASH_FOREACH_STR_KEY_VAL(options_ht, key, value) {
			if (key) {
				ZVAL_DEREF(value);
				if (zend_string_equals_literal_ci(key, "lifetime")) {
					lifetime = zval_get_string(value);
					found++;
				} else if (zend_string_equals_literal_ci(key, "path")) {
					path = zval_get_string(value);
					found++;
				} else if (zend_string_equals_literal_ci(key, "domain")) {
					domain = zval_get_string(value);
					found++;
				} else if (zend_string_equals_literal_ci(key, "secure")) {
					secure = zval_is_true(value);
					secure_null = 0;
					found++;
				} else if (zend_string_equals_literal_ci(key, "httponly")) {
					httponly = zval_is_true(value);
					httponly_null = 0;
					found++;
				} else if (zend_string_equals_literal_ci(key, "samesite")) {
					samesite = zval_get_string(value);
					found++;
				} else {
					php_error_docref(NULL, E_WARNING, "Argument …