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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* User Tracking Module (Was mod_cookies.c)
+ *
+ * *** IMPORTANT NOTE: This module is not designed to generate
+ * *** cryptographically secure cookies. This means you should not
+ * *** use cookies generated by this module for authentication purposes
+ *
+ * This Apache module is designed to track users paths through a site.
+ * It uses the client-side state ("Cookie") protocol developed by Netscape.
+ * It is known to work on most browsers.
+ *
+ * Each time a page is requested we look to see if the browser is sending
+ * us a Cookie: header that we previously generated.
+ *
+ * If we don't find one then the user hasn't been to this site since
+ * starting their browser or their browser doesn't support cookies. So
+ * we generate a unique Cookie for the transaction and send it back to
+ * the browser (via a "Set-Cookie" header)
+ * Future requests from the same browser should keep the same Cookie line.
+ *
+ * By matching up all the requests with the same cookie you can
+ * work out exactly what path a user took through your site. To log
+ * the cookie use the " %{Cookie}n " directive in a custom access log;
+ *
+ * Example 1 : If you currently use the standard Log file format (CLF)
+ * and use the command "TransferLog somefilename", add the line
+ * LogFormat "%h %l %u %t \"%r\" %s %b %{Cookie}n"
+ * to your config file.
+ *
+ * Example 2 : If you used to use the old "CookieLog" directive, you
+ * can emulate it by adding the following command to your config file
+ * CustomLog filename "%{Cookie}n \"%r\" %t"
+ *
+ * Mark Cox, mjc@apache.org, 6 July 95
+ *
+ * This file replaces mod_cookies.c
+ */
+
+#include "apr.h"
+#include "apr_lib.h"
+#include "apr_strings.h"
+
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_request.h"
+
+
+module AP_MODULE_DECLARE_DATA usertrack_module;
+
+typedef struct {
+ int always;
+ int expires;
+} cookie_log_state;
+
+typedef enum {
+ CT_UNSET,
+ CT_NETSCAPE,
+ CT_COOKIE,
+ CT_COOKIE2
+} cookie_type_e;
+
+typedef struct {
+ int enabled;
+ cookie_type_e style;
+ char *cookie_name;
+ char *cookie_domain;
+ char *regexp_string; /* used to compile regexp; save for debugging */
+ regex_t *regexp; /* used to find usertrack cookie in cookie header */
+} cookie_dir_rec;
+
+/* Make Cookie: Now we have to generate something that is going to be
+ * pretty unique. We can base it on the pid, time, hostip */
+
+#define COOKIE_NAME "Apache"
+
+static void make_cookie(request_rec *r)
+{
+ cookie_log_state *cls = ap_get_module_config(r->server->module_config,
+ &usertrack_module);
+ /* 1024 == hardcoded constant */
+ char cookiebuf[1024];
+ char *new_cookie;
+ const char *rname = ap_get_remote_host(r->connection, r->per_dir_config,
+ REMOTE_NAME, NULL);
+ cookie_dir_rec *dcfg;
+
+ dcfg = ap_get_module_config(r->per_dir_config, &usertrack_module);
+
+ /* XXX: hmm, this should really tie in with mod_unique_id */
+ apr_snprintf(cookiebuf, sizeof(cookiebuf), "%s.%" APR_TIME_T_FMT, rname,
+ apr_time_now());
+
+ if (cls->expires) {
+
+ /* Cookie with date; as strftime '%a, %d-%h-%y %H:%M:%S GMT' */
+ new_cookie = apr_psprintf(r->pool, "%s=%s; path=/",
+ dcfg->cookie_name, cookiebuf);
+
+ if ((dcfg->style == CT_UNSET) || (dcfg->style == CT_NETSCAPE)) {
+ apr_time_exp_t tms;
+ apr_time_exp_gmt(&tms, r->request_time
+ + apr_time_from_sec(cls->expires));
+ new_cookie = apr_psprintf(r->pool,
+ "%s; expires=%s, "
+ "%.2d-%s-%.2d %.2d:%.2d:%.2d GMT",
+ new_cookie, apr_day_snames[tms.tm_wday],
+ tms.tm_mday,
+ apr_month_snames[tms.tm_mon],
+ tms.tm_year % 100,
+ tms.tm_hour, tms.tm_min, tms.tm_sec);
+ }
+ else {
+ new_cookie = apr_psprintf(r->pool, "%s; max-age=%d",
+ new_cookie, cls->expires);
+ }
+ }
+ else {
+ new_cookie = apr_psprintf(r->pool, "%s=%s; path=/",
+ dcfg->cookie_name, cookiebuf);
+ }
+ if (dcfg->cookie_domain != NULL) {
+ new_cookie = apr_pstrcat(r->pool, new_cookie, "; domain=",
+ dcfg->cookie_domain,
+ (dcfg->style == CT_COOKIE2
+ ? "; version=1"
+ : ""),
+ NULL);
+ }
+
+ apr_table_addn(r->headers_out,
+ (dcfg->style == CT_COOKIE2 ? "Set-Cookie2" : "Set-Cookie"),
+ new_cookie);
+ apr_table_setn(r->notes, "cookie", apr_pstrdup(r->pool, cookiebuf)); /* log first time */
+ return;
+}
+
+/* dcfg->regexp is "^cookie_name=([^;]+)|;[ \t]+cookie_name=([^;]+)",
+ * which has three subexpressions, $0..$2 */
+#define NUM_SUBS 3
+
+static void set_and_comp_regexp(cookie_dir_rec *dcfg,
+ apr_pool_t *p,
+ const char *cookie_name)
+{
+ int danger_chars = 0;
+ const char *sp = cookie_name;
+
+ /* The goal is to end up with this regexp,
+ * ^cookie_name=([^;]+)|;[\t]+cookie_name=([^;]+)
+ * with cookie_name obviously substituted either
+ * with the real cookie name set by the user in httpd.conf, or with the
+ * default COOKIE_NAME.
+ */
+
+ /* Anyway, we need to escape the cookie_name before pasting it
+ * into the regex
+ */
+ while (*sp) {
+ if (!apr_isalnum(*sp)) {
+ ++danger_chars;
+ }
+ ++sp;
+ }
+
+ if (danger_chars) {
+ char *cp;
+ cp = apr_palloc(p, sp - cookie_name + danger_chars + 1); /* 1 == \0 */
+ sp = cookie_name;
+ cookie_name = cp;
+ while (*sp) {
+ if (!apr_isalnum(*sp)) {
+ *cp++ = '\\';
+ }
+ *cp++ = *sp++;
+ }
+ *cp = '\0';
+ }
+
+ dcfg->regexp_string = apr_pstrcat(p, "^",
+ cookie_name,
+ "=([^;]+)|;[ \t]+",
+ cookie_name,
+ "=([^;]+)", NULL);
+
+ dcfg->regexp = ap_pregcomp(p, dcfg->regexp_string, REG_EXTENDED);
+ ap_assert(dcfg->regexp != NULL);
+}
+
+static int spot_cookie(request_rec *r)
+{
+ cookie_dir_rec *dcfg = ap_get_module_config(r->per_dir_config,
+ &usertrack_module);
+ const char *cookie_header;
+ regmatch_t regm[NUM_SUBS];
+
+ /* Do not run in subrequests */
+ if (!dcfg->enabled || r->main) {
+ return DECLINED;
+ }
+
+ if ((cookie_header = apr_table_get(r->headers_in, "Cookie"))) {
+ if (!ap_regexec(dcfg->regexp, cookie_header, NUM_SUBS, regm, 0)) {
+ char *cookieval = NULL;
+ /* Our regexp,
+ * ^cookie_name=([^;]+)|;[ \t]+cookie_name=([^;]+)
+ * only allows for $1 or $2 to be available. ($0 is always
+ * filled with the entire matched expression, not just
+ * the part in parentheses.) So just check for either one
+ * and assign to cookieval if present. */
+ if (regm[1].rm_so != -1) {
+ cookieval = ap_pregsub(r->pool, "$1", cookie_header,
+ NUM_SUBS, regm);
+ }
+ if (regm[2].rm_so != -1) {
+ cookieval = ap_pregsub(r->pool, "$2", cookie_header,
+ NUM_SUBS, regm);
+ }
+ /* Set the cookie in a note, for logging */
+ apr_table_setn(r->notes, "cookie", cookieval);
+
+ return DECLINED; /* There's already a cookie, no new one */
+ }
+ }
+ make_cookie(r);
+ return OK; /* We set our cookie */
+}
+
+static void *make_cookie_log_state(apr_pool_t *p, server_rec *s)
+{
+ cookie_log_state *cls =
+ (cookie_log_state *) apr_palloc(p, sizeof(cookie_log_state));
+
+ cls->expires = 0;
+
+ return (void *) cls;
+}
+
+static void *make_cookie_dir(apr_pool_t *p, char *d)
+{
+ cookie_dir_rec *dcfg;
+
+ dcfg = (cookie_dir_rec *) apr_pcalloc(p, sizeof(cookie_dir_rec));
+ dcfg->cookie_name = COOKIE_NAME;
+ dcfg->cookie_domain = NULL;
+ dcfg->style = CT_UNSET;
+ dcfg->enabled = 0;
+
+ /* In case the user does not use the CookieName directive,
+ * we need to compile the regexp for the default cookie name. */
+ set_and_comp_regexp(dcfg, p, COOKIE_NAME);
+
+ return dcfg;
+}
+
+static const char *set_cookie_enable(cmd_parms *cmd, void *mconfig, int arg)
+{
+ cookie_dir_rec *dcfg = mconfig;
+
+ dcfg->enabled = arg;
+ return NULL;
+}
+
+static const char *set_cookie_exp(cmd_parms *parms, void *dummy,
+ const char *arg)
+{
+ cookie_log_state *cls;
+ time_t factor, modifier = 0;
+ time_t num = 0;
+ char *word;
+
+ cls = ap_get_module_config(parms->server->module_config,
+ &usertrack_module);
+ /* The simple case first - all numbers (we assume) */
+ if (apr_isdigit(arg[0]) && apr_isdigit(arg[strlen(arg) - 1])) {
+ cls->expires = atol(arg);
+ return NULL;
+ }
+
+ /*
+ * The harder case - stolen from mod_expires
+ *
+ * CookieExpires "[plus] {<num> <type>}*"
+ */
+
+ word = ap_getword_conf(parms->pool, &arg);
+ if (!strncasecmp(word, "plus", 1)) {
+ word = ap_getword_conf(parms->pool, &arg);
+ };
+
+ /* {<num> <type>}* */
+ while (word[0]) {
+ /* <num> */
+ if (apr_isdigit(word[0]))
+ num = atoi(word);
+ else
+ return "bad expires code, numeric value expected.";
+
+ /* <type> */
+ word = ap_getword_conf(parms->pool, &arg);
+ if (!word[0])
+ return "bad expires code, missing <type>";
+
+ factor = 0;
+ if (!strncasecmp(word, "years", 1))
+ factor = 60 * 60 * 24 * 365;
+ else if (!strncasecmp(word, "months", 2))
+ factor = 60 * 60 * 24 * 30;
+ else if (!strncasecmp(word, "weeks", 1))
+ factor = 60 * 60 * 24 * 7;
+ else if (!strncasecmp(word, "days", 1))
+ factor = 60 * 60 * 24;
+ else if (!strncasecmp(word, "hours", 1))
+ factor = 60 * 60;
+ else if (!strncasecmp(word, "minutes", 2))
+ factor = 60;
+ else if (!strncasecmp(word, "seconds", 1))
+ factor = 1;
+ else
+ return "bad expires code, unrecognized type";
+
+ modifier = modifier + factor * num;
+
+ /* next <num> */
+ word = ap_getword_conf(parms->pool, &arg);
+ }
+
+ cls->expires = modifier;
+
+ return NULL;
+}
+
+static const char *set_cookie_name(cmd_parms *cmd, void *mconfig,
+ const char *name)
+{
+ cookie_dir_rec *dcfg = (cookie_dir_rec *) mconfig;
+
+ dcfg->cookie_name = apr_pstrdup(cmd->pool, name);
+
+ set_and_comp_regexp(dcfg, cmd->pool, name);
+
+ if (dcfg->regexp == NULL) {
+ return "Regular expression could not be compiled.";
+ }
+ if (dcfg->regexp->re_nsub + 1 != NUM_SUBS) {
+ return apr_pstrcat(cmd->pool, "Invalid cookie name \"",
+ name, "\"", NULL);
+ }
+
+ return NULL;
+}
+
+/*
+ * Set the value for the 'Domain=' attribute.
+ */
+static const char *set_cookie_domain(cmd_parms *cmd, void *mconfig,
+ const char *name)
+{
+ cookie_dir_rec *dcfg;
+
+ dcfg = (cookie_dir_rec *) mconfig;
+
+ /*
+ * Apply the restrictions on cookie domain attributes.
+ */
+ if (strlen(name) == 0) {
+ return "CookieDomain values may not be null";
+ }
+ if (name[0] != '.') {
+ return "CookieDomain values must begin with a dot";
+ }
+ if (ap_strchr_c(&name[1], '.') == NULL) {
+ return "CookieDomain values must contain at least one embedded dot";
+ }
+
+ dcfg->cookie_domain = apr_pstrdup(cmd->pool, name);
+ return NULL;
+}
+
+/*
+ * Make a note of the cookie style we should use.
+ */
+static const char *set_cookie_style(cmd_parms *cmd, void *mconfig,
+ const char *name)
+{
+ cookie_dir_rec *dcfg;
+
+ dcfg = (cookie_dir_rec *) mconfig;
+
+ if (strcasecmp(name, "Netscape") == 0) {
+ dcfg->style = CT_NETSCAPE;
+ }
+ else if ((strcasecmp(name, "Cookie") == 0)
+ || (strcasecmp(name, "RFC2109") == 0)) {
+ dcfg->style = CT_COOKIE;
+ }
+ else if ((strcasecmp(name, "Cookie2") == 0)
+ || (strcasecmp(name, "RFC2965") == 0)) {
+ dcfg->style = CT_COOKIE2;
+ }
+ else {
+ return apr_psprintf(cmd->pool, "Invalid %s keyword: '%s'",
+ cmd->cmd->name, name);
+ }
+
+ return NULL;
+}
+
+static const command_rec cookie_log_cmds[] = {
+ AP_INIT_TAKE1("CookieExpires", set_cookie_exp, NULL, OR_FILEINFO,
+ "an expiry date code"),
+ AP_INIT_TAKE1("CookieDomain", set_cookie_domain, NULL, OR_FILEINFO,
+ "domain to which this cookie applies"),
+ AP_INIT_TAKE1("CookieStyle", set_cookie_style, NULL, OR_FILEINFO,
+ "'Netscape', 'Cookie' (RFC2109), or 'Cookie2' (RFC2965)"),
+ AP_INIT_FLAG("CookieTracking", set_cookie_enable, NULL, OR_FILEINFO,
+ "whether or not to enable cookies"),
+ AP_INIT_TAKE1("CookieName", set_cookie_name, NULL, OR_FILEINFO,
+ "name of the tracking cookie"),
+ {NULL}
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+ ap_hook_fixups(spot_cookie,NULL,NULL,APR_HOOK_MIDDLE);
+}
+
+module AP_MODULE_DECLARE_DATA usertrack_module = {
+ STANDARD20_MODULE_STUFF,
+ make_cookie_dir, /* dir config creater */
+ NULL, /* dir merger --- default is to override */
+ make_cookie_log_state, /* server config */
+ NULL, /* merge server configs */
+ cookie_log_cmds, /* command apr_table_t */
+ register_hooks /* register hooks */
+};