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mod_auth_memcookie.c
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/* Copyright 1999-2004 The Apache Software Foundation
*
* Licensed 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.
*/
/*
* mod_auth_memcookie_module: memcached cookies authentication
*
* Autor: Mathieu CARBONNEAUX
*
*/
/* changed by mls in 2011-04:
*
* - ported the code to libmemcached.
* - made sure that the session data contains no \r or \n.
* - made sure that the cookie is a valid md5sum.
* - added Auth_memCookie_SessionHeaders option to specify which
* headers should be cleared from the input headers and taken from
* the session data.
* - added szAuth_memCookie_AuthentificationURI to configure that
* the session is created by doing a subrequest to the specfied
* URI and using the returned headers (uses the configured
* SessionHeaders).
* - added Auth_memCookie_AuthentificationHeader option to tell the
* module that it can take the user name from the specified header
* when it creates the session.
* - added Auth_memCookie_AuthentificationURIOnlyAuth to make it
* just run the authentification steps for the subrequest
* (data is taken from the input headers in that case).
* - added Auth_memCookie_CookieDomain to specify a domain for the
* session cookie.
* - added Auth_memCookie_AllowAnonymous to specify that no session
* is required for the request.
* - added Auth_memCookie_CommandHeader to specify a way to issue
* commands for session managemant: "login" makes it ignore the
* AllowAnonymous flag, "logout" deletes the session.
*/
#include <stdio.h>
#include <string.h>
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "apr_strings.h"
#include "apr_uuid.h"
#include "apr_md5.h" /* for apr_password_validate */
#include "apr_tables.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h" /* for ap_hook_(check_user_id | auth_checker)*/
#include "http_vhost.h"
#include "apr_base64.h"
#include "memcached.h"
#define ERRTAG "Auth_memCookie: "
#define VERSION "1.0.2"
/* apache module name */
module AP_MODULE_DECLARE_DATA auth_memcookie_module;
/* config structure */
typedef struct {
char * szAuth_memCookie_memCached_addr;
apr_time_t tAuth_memCookie_MemcacheObjectExpiry;
int nAuth_memCookie_MemcacheObjectExpiryReset;
int nAuth_memCookie_SetSessionHTTPHeader;
int nAuth_memCookie_SetSessionHTTPHeaderEncode;
int nAuth_memCookie_SessionTableSize;
char * szAuth_memCookie_CookieName;
char * szAuth_memCookie_CookieDomain;
int nAuth_memCookie_GroupAuthoritative;
int nAuth_memCookie_Authoritative;
int nAuth_memCookie_MatchIP_Mode;
int nAuth_memCookie_authbasicfix;
char * szAuth_memCookie_AuthentificationURI;
char * szAuth_memCookie_AuthentificationHeader;
char * szAuth_memCookie_SessionHeaders;
char * szAuth_memCookie_CommandHeader;
int nAuth_memCookie_AllowAnonymous;
int nAuth_memCookie_AuthentificationURIOnlyAuth;
} strAuth_memCookie_config_rec;
extern ap_conf_vector_t * ap_create_request_config(apr_pool_t *p);
/* copied from apache's request.c :-( */
static request_rec *make_sub_request(const request_rec *r)
{
apr_pool_t *rrp;
request_rec *rnew;
apr_pool_create(&rrp, r->pool);
apr_pool_tag(rrp, "subrequest");
rnew = apr_pcalloc(rrp, sizeof(request_rec));
rnew->pool = rrp;
rnew->hostname = r->hostname;
rnew->request_time = r->request_time;
rnew->connection = r->connection;
rnew->server = r->server;
rnew->request_config = ap_create_request_config(rnew->pool);
rnew->per_dir_config = r->server->lookup_defaults;
rnew->htaccess = r->htaccess;
rnew->allowed_methods = ap_make_method_list(rnew->pool, 2);
ap_copy_method_list(rnew->allowed_methods, r->allowed_methods);
rnew->proto_input_filters = r->proto_input_filters;
rnew->proto_output_filters = r->proto_output_filters;
rnew->input_filters = r->proto_input_filters;
rnew->output_filters = r->proto_output_filters;
ap_set_sub_req_protocol(rnew, r);
ap_run_create_request(rnew);
rnew->used_path_info = AP_REQ_DEFAULT_PATH_INFO;
return rnew;
}
static request_rec *sub_req_method_uri(const char *method, const char *new_uri, const request_rec *r)
{
request_rec *rnew;
int res = HTTP_INTERNAL_SERVER_ERROR;
rnew = make_sub_request(r);
rnew->method = method;
rnew->method_number = ap_method_number_of(method);
ap_parse_uri(rnew, new_uri);
if (ap_is_recursion_limit_exceeded(r)) {
rnew->status = HTTP_INTERNAL_SERVER_ERROR;
return rnew;
}
ap_update_vhost_from_headers(rnew);
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
return rnew;
}
/* end of copied code */
/* Look through 'Cookie' header for indicated cookie; extract it
* and URL-unescape it. Return the cookie on success, NULL on failure. */
static char * extract_cookie(request_rec *r, const char *szCookie_name)
{
const char *szRaw_cookie, *szRaw_cookie_start = NULL, *szRaw_cookie_end;
char *szCookie;
int i;
/* get cookie string */
szRaw_cookie = apr_table_get(r->headers_in, "Cookie");
if (!szRaw_cookie)
return 0;
/* loop to search cookie name in cookie header */
do {
/* search cookie name in cookie string */
if ((szRaw_cookie = strstr(szRaw_cookie, szCookie_name)) == 0)
return 0;
szRaw_cookie_start = szRaw_cookie;
/* search '=' */
if ((szRaw_cookie = strchr(szRaw_cookie, '=')) == 0)
return 0;
} while (strncmp(szCookie_name, szRaw_cookie_start, szRaw_cookie - szRaw_cookie_start) != 0);
/* skip '=' */
szRaw_cookie++;
/* search end of cookie name value: ';' or end of cookie strings */
if ((szRaw_cookie_end = strchr(szRaw_cookie, ';')) == 0 && (szRaw_cookie_end = strchr(szRaw_cookie, '\0')) == 0)
return 0;
/* dup the value string found in apache pool and set the result pool ptr to szCookie ptr */
if ((szCookie = apr_pstrndup(r->pool, szRaw_cookie, szRaw_cookie_end-szRaw_cookie)) == 0)
return 0;
/* unescape the value string */
if (ap_unescape_url(szCookie) != 0)
return 0;
/* be extra paranoid about the cookie value, reject if no md5sum */
if (strlen(szCookie) != 32)
return 0;
for (i = 0; i < 32; i++) {
if (szCookie[i] >= '0' && szCookie[i] <= '9')
continue;
if (szCookie[i] >= 'a' && szCookie[i] <= 'f')
continue;
return 0;
}
return szCookie;
}
/* function to fix any headers in the input request that may be relied on by an
application. e.g. php uses the Authorization header when logging the request
in apache and not r->user (like it ought to). It is applied after the request
has been authenticated. */
static void fix_headers_in(request_rec *r, const char *szPassword)
{
const char *szUser = NULL;
/* Set an Authorization header in the input request table for php and
other applications that use it to obtain the username (mainly to fix
apache logging of php scripts). We only set this if there is no header
already present. */
if (apr_table_get(r->headers_in, "Authorization") == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r, ERRTAG "fixing apache Authorization header for this request using user:%s",r->user);
/* concat username and ':' */
if (szPassword != NULL)
szUser = apr_pstrcat(r->pool, r->user, ":", szPassword, NULL);
else
szUser = apr_pstrcat(r->pool, r->user, ":", NULL);
/* alloc memory for the estimated encode size of the username */
char *szB64_enc_user = apr_palloc(r->pool, apr_base64_encode_len(strlen(szUser)) + 1);
if (!szB64_enc_user) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "memory alloc failed!");
return;
}
/* encode username in base64 format */
apr_base64_encode(szB64_enc_user, szUser, strlen(szUser));
/* set authorization header */
apr_table_set(r->headers_in, "Authorization", apr_pstrcat(r->pool, "Basic ", szB64_enc_user, NULL));
/* force auth type to basic */
r->ap_auth_type = apr_pstrdup(r->pool, "Basic");
}
return;
}
/* get session with szCookieValue key from memcached server */
static apr_table_t *Auth_memCookie_get_session(request_rec *r, strAuth_memCookie_config_rec *conf, char *szCookieValue)
{
char *szMemcached_addr = conf->szAuth_memCookie_memCached_addr;
apr_time_t tExpireTime = conf->tAuth_memCookie_MemcacheObjectExpiry;
memcached_st *mc_session = NULL;
memcached_server_st *servers = NULL;
memcached_return mc_err = 0;
apr_table_t *pMySession = NULL;
size_t nGetKeyLen = strlen(szCookieValue);
uint32_t nGetFlags = 0;
size_t nGetLen = 0;
char *szTokenPos;
char *szFieldTokenPos;
char *szField;
char *szValue;
char *szFieldName;
char *szFieldValue;
char *szMyValue;
const char *UserName;
int nbInfo = 0;
if ((pMySession = apr_table_make(r->pool, conf->nAuth_memCookie_SessionTableSize)) == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, ERRTAG "apr_tablemake failed");
return NULL;
}
/* init memcache lib */
if ((mc_session = memcached_create(NULL)) == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "memcache lib init failed");
return NULL;
}
servers = memcached_servers_parse(szMemcached_addr);
memcached_server_push(mc_session, servers);
if ((szValue = memcached_get(mc_session, szCookieValue, nGetKeyLen, &nGetLen, &nGetFlags, &mc_err)) == 0) {
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "memcached_get failed to find key '%s'",szCookieValue);
memcached_free(mc_session);
return NULL;
}
/* dup szValue in pool */
szMyValue = apr_pstrdup(r->pool, szValue);
/* split szValue into struct strAuthSession */
/* szValue is formated multi line (\r\n) with name=value on each line */
/* must containe UserName,Groups,RemoteIP fieldname */
szTokenPos = NULL;
for (szField = strtok_r(szMyValue, "\r\n", &szTokenPos); szField; szField=strtok_r(NULL, "\r\n", &szTokenPos)) {
szFieldTokenPos = NULL;
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "session field:%s",szField);
szFieldName = strtok_r(szField, "=", &szFieldTokenPos);
szFieldValue = strtok_r(NULL, "=", &szFieldTokenPos);
if (szFieldName != NULL && szFieldValue != NULL) {
/* add key and value in pMySession table */
apr_table_set(pMySession, szFieldName, szFieldValue);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "session information %s=%s",szFieldName,szFieldValue);
/* count the number of element added to table to check table size not reached */
nbInfo++;
if (nbInfo > conf->nAuth_memCookie_SessionTableSize) {
ap_log_rerror(APLOG_MARK,APLOG_ERR|APLOG_NOERRNO, 0,r,ERRTAG "maximum session information reached!");
if (szValue)
free(szValue);
memcached_free(mc_session);
return NULL;
}
}
}
if (!apr_table_get(pMySession, "UserName")) {
ap_log_rerror(APLOG_MARK,APLOG_ERR|APLOG_NOERRNO, 0,r,ERRTAG "Username not found in Session value(key:%s) found = %s",szCookieValue,szValue);
pMySession = NULL;
} else if (conf->nAuth_memCookie_MatchIP_Mode != 0 && !apr_table_get(pMySession, "RemoteIP")) {
ap_log_rerror(APLOG_MARK,APLOG_ERR|APLOG_NOERRNO, 0,r,ERRTAG "MatchIP_Mode activated and RemoteIP not found in Session value(key:%s) found = %s",szCookieValue,szValue);
pMySession = NULL;
} else {
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "Value for Session (key:%s) found => Username=%s Groups=%s RemoteIp=%s",
szCookieValue,
apr_table_get(pMySession,"UserName"),
apr_table_get(pMySession,"Groups"),
apr_table_get(pMySession,"RemoteIP"));
}
/* reset expire time */
if (conf->nAuth_memCookie_MemcacheObjectExpiryReset && pMySession) {
if ((mc_err = memcached_set(mc_session, szCookieValue, nGetKeyLen, szValue, nGetLen, tExpireTime, 0))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,ERRTAG "Expire time with mc_set (key:%s) failed with errcode=%d",szCookieValue,mc_err);
pMySession = NULL;
}
}
/* free returned value */
if (szValue)
free(szValue);
/* free the mc session */
memcached_free(mc_session);
/* set the good username found in request structure */
UserName = 0;
if (pMySession != NULL)
UserName = apr_table_get(pMySession, "UserName");
if (UserName)
r->user = (char *)UserName;
return pMySession;
}
struct session_concat_func_data {
apr_pool_t *pool;
char *str;
};
static int session_concat_func(void *req, const char *key, const char *value) {
struct session_concat_func_data *fd = req;
if (strchr(key, '\r') || strchr(key, '\n'))
return 1;
if (strchr(value, '\r') || strchr(value, '\n'))
return 1;
fd->str = apr_pstrcat(fd->pool, fd->str, key, "=", value, "\r\n", NULL);
return 1;
}
/* store session with szCookieValue key into the memcached server */
static int Auth_memCookie_set_session(request_rec *r, strAuth_memCookie_config_rec *conf, char *szCookieValue, apr_table_t *session)
{
char *szMemcached_addr = conf->szAuth_memCookie_memCached_addr;
memcached_st *mc_session = NULL;
memcached_server_st *servers = NULL;
memcached_return mc_err = 0;
size_t nGetKeyLen = strlen(szCookieValue);
apr_time_t tExpireTime = conf->tAuth_memCookie_MemcacheObjectExpiry;
struct session_concat_func_data fd;
/* concat everything from the session into a single string */
fd.pool = r->pool;
fd.str = apr_pstrcat(r->pool, "", NULL);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "concat session...");
apr_table_do(session_concat_func, &fd, session, NULL);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "-> %s", fd.str);
/* put concatenated session into the memcachd */
if ((mc_session = memcached_create(NULL)) == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "memcache lib init failed");
return DECLINED;
}
servers = memcached_servers_parse(szMemcached_addr);
memcached_server_push(mc_session, servers);
if ((mc_err = memcached_set(mc_session, szCookieValue, nGetKeyLen, fd.str, strlen(fd.str), tExpireTime, 0))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,ERRTAG "Auth_memCookie_set_session memcached_set (key:%s) failed with errcode=%d",szCookieValue,mc_err);
memcached_free(mc_session);
return DECLINED;
}
memcached_free(mc_session);
return OK;
}
/* delete session with szCookieValue key from the memcached server */
static int Auth_memCookie_delete_session(request_rec *r, strAuth_memCookie_config_rec *conf, char *szCookieValue)
{
char *szMemcached_addr=conf->szAuth_memCookie_memCached_addr;
memcached_st *mc_session=NULL;
memcached_server_st *servers = NULL;
memcached_return mc_err=0;
size_t nGetKeyLen=strlen(szCookieValue);
if ((mc_session = memcached_create(NULL)) == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "memcache lib init failed");
return DECLINED;
}
servers = memcached_servers_parse(szMemcached_addr);
memcached_server_push(mc_session, servers);
if ((mc_err = memcached_delete(mc_session, szCookieValue, nGetKeyLen, (time_t)0)) != 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,ERRTAG "Auth_memCookie_delete_session memcached_delete (key:%s) failed with errcode=%d",szCookieValue,mc_err);
memcached_free(mc_session);
return DECLINED;
}
memcached_free(mc_session);
return OK;
}
/* generate a random cookie */
static char *create_new_cookie(request_rec *r, char *username)
{
apr_md5_ctx_t context;
unsigned char digest[16];
char digest_hex[33];
unsigned char random[16];
struct timeval tv;
int i;
gettimeofday(&tv, 0);
apr_generate_random_bytes(random, 16);
apr_md5_init(&context);
apr_md5_update(&context, (const unsigned char *)random, sizeof(random));
if (username)
apr_md5_update(&context, (const unsigned char *)username, strlen(username));
apr_md5_update(&context, (const unsigned char *)&tv, sizeof(tv));
apr_md5_final(digest, &context);
for (i = 0; i < 16; i++) {
digest_hex[2 * i + 0] = "0123456789abcdef"[digest[i] >> 4 & 15];
digest_hex[2 * i + 1] = "0123456789abcdef"[digest[i] & 15];
}
digest_hex[32] = 0;
return apr_pstrdup(r->pool, digest_hex);
}
/* check if szGroup are in szGroups. */
static int get_Auth_memCookie_grp(request_rec *r, const char *szGroup, const char *szGroups)
{
char *szGrp_End;
char *szGrp_Pos;
char *szMyGroups;
/* make a copy */
szMyGroups = apr_pstrdup(r->pool, szGroups);
/* search group in groups */
if ((szGrp_Pos = strstr(szMyGroups, szGroup)) == 0) {
return DECLINED;
}
/* search the next ':' and set '\0' in place of ':' */
if ((szGrp_End = strchr(szGrp_Pos,':')))
szGrp_End[0] = '\0';
/* compar szGroup with szGrp_Pos if ok return ok */
if(strcmp(szGroup, szGrp_Pos))
return DECLINED;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r, ERRTAG "group found=%s",szGrp_Pos);
return OK;
}
/* user apr_table_do to set session information in child environment variable */
static int Auth_memCookie_DoSetEnv(void *rec, const char *szKey, const char *szValue)
{
request_rec *r = (request_rec*)rec;
char *szEnvName = apr_pstrcat(r->pool,"MCAC_",szKey,NULL);
/* set env var MCAC_USER to the user session value */
apr_table_setn(r->subprocess_env, szEnvName, szValue);
return 1;
}
/* user apr_table_do to set session information in header http */
static int Auth_memCookie_DoSetHeader(void *rec, const char *szKey, const char *szValue)
{
strAuth_memCookie_config_rec *conf = NULL;
request_rec *r = (request_rec*)rec;
const char *szHeaderName = szKey;
/* if key does not start with X-, preprent X-MCAC_ */
if (strncasecmp(szHeaderName, "x-", 2) != 0)
szHeaderName = apr_pstrcat(r->pool, "X-MCAC_", szHeaderName, NULL);
/* get apache config */
conf = ap_get_module_config(r->per_dir_config, &auth_memcookie_module);
if (conf->nAuth_memCookie_SetSessionHTTPHeaderEncode) {
/* alloc memory for the estimated encode size of the string */
char *szB64_enc_string = apr_palloc(r->pool,apr_base64_encode_len(strlen(szValue))+1);
if (!szB64_enc_string) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "memory alloc for encoding http header failed!");
return 0;
}
/* encode string in base64 format */
apr_base64_encode(szB64_enc_string, szValue, strlen(szValue));
/* set string header */
apr_table_set(r->headers_in,szHeaderName, szB64_enc_string);
} else {
/* set string header */
apr_table_set(r->headers_in,szHeaderName, szValue);
}
return 1;
}
/* create a session by doing a subrequest to URI uri, the returned headers define the session */
static apr_table_t *Auth_memCookie_session_from_subrequest(request_rec *r, strAuth_memCookie_config_rec *conf, char *uri)
{
apr_table_t *pAuthSession = NULL;
request_rec *rr = NULL;
const char *UserName;
if (uri[0] == '/')
rr = ap_sub_req_lookup_uri(uri, r, NULL);
else
rr = sub_req_method_uri("GET", uri, r);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "subrequest return1: %d", rr->status);
if (!conf->nAuth_memCookie_AuthentificationURIOnlyAuth && rr->status == HTTP_OK) {
/* need to add the "SINK" output filter, otherwise the response will be sent to the client */
ap_add_output_filter("MEMCOOKIE_SINK", NULL, rr, rr->connection);
if (ap_run_sub_req(rr) != OK) {
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "ap_run_sub_req error");
ap_destroy_sub_req(rr);
return 0;
}
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "subrequest return2: %d", rr->status);
}
if (rr->status != HTTP_OK) {
const char *www_auth = apr_table_get(rr->err_headers_out, "WWW-Authenticate");
if (!www_auth) {
www_auth = apr_table_get(rr->headers_out, "WWW-Authenticate");
}
if (www_auth) {
apr_table_set(r->headers_out, "WWW-Authenticate", www_auth);
apr_table_set(r->err_headers_out, "WWW-Authenticate", www_auth);
}
ap_destroy_sub_req(rr);
return 0;
}
/* create session */
if (!(pAuthSession = apr_table_make(r->pool, conf->nAuth_memCookie_SessionTableSize))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, ERRTAG "apr_tablemake failed");
ap_destroy_sub_req(rr);
return 0;
}
/* copy all configured headers into the session */
if (conf->szAuth_memCookie_SessionHeaders) {
char *headers = apr_pstrdup(r->pool, conf->szAuth_memCookie_SessionHeaders);
char *key, *keypos = 0;
for(key = strtok_r(headers, ", ", &keypos); key; key = strtok_r(NULL, ", ", &keypos)) {
const char *value;
if (conf->nAuth_memCookie_AuthentificationURIOnlyAuth) {
value = apr_table_get(rr->headers_in, key);
} else {
value = apr_table_get(rr->err_headers_out, key);
if (!value)
value = apr_table_get(rr->headers_out, key);
}
if (value && !strchr(value, '\r') && !strchr(value, '\n')) {
if (!strncmp(key, "X-MCAC_", 7))
apr_table_set(pAuthSession, key + 7, value);
else
apr_table_set(pAuthSession, key, value);
}
}
}
/* copy the username into the session */
if (conf->szAuth_memCookie_AuthentificationHeader) {
if (conf->nAuth_memCookie_AuthentificationURIOnlyAuth) {
UserName = apr_table_get(rr->headers_in, conf->szAuth_memCookie_AuthentificationHeader);
} else {
UserName = apr_table_get(rr->err_headers_out, conf->szAuth_memCookie_AuthentificationHeader);
if (!UserName)
UserName = apr_table_get(rr->headers_out, conf->szAuth_memCookie_AuthentificationHeader);
}
if (UserName && (strchr(UserName, '\r') != 0 || strchr(UserName, '\n') != 0))
UserName = 0;
if (UserName)
apr_table_set(pAuthSession, "UserName", UserName);
else
apr_table_unset(pAuthSession, "UserName");
}
ap_destroy_sub_req(rr);
/* make sure that we have a UserName */
UserName = apr_table_get(pAuthSession, "UserName");
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "username: %s", UserName ? UserName : "NULL");
if (!UserName)
return 0;
r->user = (char *)UserName;
return pAuthSession;
}
/**************************************************
* authentification phase:
* verify if cookie is set and if it is known in memcache server
**************************************************/
static int Auth_memCookie_check_cookie(request_rec *r)
{
strAuth_memCookie_config_rec *conf = NULL;
char *szCookieValue = NULL;
apr_table_t *pAuthSession = NULL;
apr_status_t tRetStatus;
char *szRemoteIP = NULL;
const char *command = NULL;
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "ap_hook_check_user_id in");
/* get apache config */
conf = ap_get_module_config(r->per_dir_config, &auth_memcookie_module);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "check MatchIP_Mode:%d",conf->nAuth_memCookie_MatchIP_Mode);
/* set remote ip in case of conf->nAuth_memCookie_MatchIP_Mode value */
if (conf->nAuth_memCookie_MatchIP_Mode == 2 && apr_table_get(r->headers_in, "Via") != NULL)
szRemoteIP = apr_pstrdup(r->pool, apr_table_get(r->headers_in, "Via"));
else if (conf->nAuth_memCookie_MatchIP_Mode == 1 && apr_table_get(r->headers_in, "X-Forwarded-For") != NULL)
szRemoteIP = apr_pstrdup(r->pool, apr_table_get(r->headers_in, "X-Forwarded-For"));
else
szRemoteIP = apr_pstrdup(r->pool, r->connection->remote_ip);
if (!conf->nAuth_memCookie_Authoritative)
return DECLINED;
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "AuthType is '%s'", ap_auth_type(r));
if (strncmp("Cookie", ap_auth_type(r), 6) != 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "Auth type not specified as 'Cookie'");
return HTTP_UNAUTHORIZED;
}
if (!conf->szAuth_memCookie_CookieName) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "No Auth_memCookie_CookieName specified");
return HTTP_UNAUTHORIZED;
}
if (!conf->szAuth_memCookie_memCached_addr) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "No Auth_memCookie_Memcached_AddrPort specified");
return HTTP_UNAUTHORIZED;
}
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "Memcached server(s) adresse(s) are %s",conf->szAuth_memCookie_memCached_addr);
pAuthSession = NULL;
/* extract session cookie from headers */
szCookieValue = extract_cookie(r, conf->szAuth_memCookie_CookieName);
/* if we have a cookie, get session from memcache */
if (szCookieValue) {
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "got cookie; value is %s", szCookieValue);
if((pAuthSession = Auth_memCookie_get_session(r, conf, szCookieValue)) == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "AuthSession %s not found: %s", szCookieValue, r->filename);
}
} else {
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "cookie not found! not authorized! RemoteIP:%s", szRemoteIP);
}
/* unset headers sent by the client that are supposed to be set by us */
if (conf->szAuth_memCookie_AuthentificationHeader)
apr_table_unset(r->headers_in, conf->szAuth_memCookie_AuthentificationHeader);
if (conf->szAuth_memCookie_SessionHeaders) {
char *headers = apr_pstrdup(r->pool, conf->szAuth_memCookie_SessionHeaders);
char *key, *keypos = 0;
for(key = strtok_r(headers, ", ", &keypos); key; key = strtok_r(NULL, ", ", &keypos))
apr_table_unset(r->headers_in, key);
}
/* check for a login/logout command */
if (conf->szAuth_memCookie_CommandHeader) {
command = apr_table_get(r->headers_in, conf->szAuth_memCookie_CommandHeader);
if (command && !strcasecmp(conf->szAuth_memCookie_CommandHeader, "Authorization")) {
/* deduce command from authorization header */
if (!*command)
command = "logout";
else
command = "login";
}
}
/* check if this is a logout request */
if (szCookieValue && command && !strcasecmp(command, "logout")) {
char *set_cookie;
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "deleting session %s", szCookieValue);
/* add set-cookie directive to headers */
set_cookie = apr_psprintf(r->pool, "%s=; expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/", conf->szAuth_memCookie_CookieName);
if (conf->szAuth_memCookie_CookieDomain && *conf->szAuth_memCookie_CookieDomain)
set_cookie = apr_psprintf(r->pool, "%s; domain=%s", set_cookie, conf->szAuth_memCookie_CookieDomain);
apr_table_add(r->headers_out, "Set-Cookie", set_cookie);
apr_table_add(r->err_headers_out, "Set-Cookie", set_cookie);
/* delete session from memcache */
Auth_memCookie_delete_session(r, conf, szCookieValue);
return HTTP_UNAUTHORIZED;
}
/* we're ok if we have no session and anonymous access is allowed */
/* (we ignore this if a "login" command is done to enforce a session) */
if (!pAuthSession && conf->nAuth_memCookie_AllowAnonymous && !(command && !strcasecmp(command, "login")))
return OK;
/* if we have no session but a subrequest creation uri is configured, do the subrequest */
if (!pAuthSession && conf->szAuth_memCookie_AuthentificationURI && *conf->szAuth_memCookie_AuthentificationURI) {
char *set_cookie;
pAuthSession = Auth_memCookie_session_from_subrequest(r, conf, conf->szAuth_memCookie_AuthentificationURI);
if (!pAuthSession)
return HTTP_UNAUTHORIZED;
/* create a new session cookie */
szCookieValue = create_new_cookie(r, r->user);
/* add set-cookie directive to headers */
set_cookie = apr_psprintf(r->pool, "%s=%s; path=/", conf->szAuth_memCookie_CookieName, szCookieValue);
if (conf->szAuth_memCookie_CookieDomain && *conf->szAuth_memCookie_CookieDomain)
set_cookie = apr_psprintf(r->pool, "%s; domain=%s", set_cookie, conf->szAuth_memCookie_CookieDomain);
apr_table_add(r->headers_out, "Set-Cookie", set_cookie);
/* store new session into memcache */
ap_log_rerror(APLOG_MARK,APLOG_INFO|APLOG_NOERRNO, 0,r,ERRTAG "creating new session in memcache");
Auth_memCookie_set_session(r, conf, szCookieValue, pAuthSession);
}
/* still no session? goodbye */
if (!pAuthSession)
return HTTP_UNAUTHORIZED;
/* push session returned structure in request pool so we can access it in Auth_memCookie_check_auth() */
if ((tRetStatus = apr_pool_userdata_setn(pAuthSession, "SESSION", NULL, r->pool))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "apr_pool_userdata_setn Apr Error: %d", tRetStatus);
return HTTP_UNAUTHORIZED;
}
/* check remote ip if option is enabled */
ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r, ERRTAG "check ip: remote_ip=%s cookie_ip=%s", szRemoteIP ,apr_table_get(pAuthSession,"RemoteIP"));
if (conf->nAuth_memCookie_MatchIP_Mode != 0) {
if (strcmp(szRemoteIP, apr_table_get(pAuthSession,"RemoteIP"))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "unauthorized, by ip. user:%s remote_ip:%s != cookie_ip:%s", apr_table_get(pAuthSession,"UserName"),szRemoteIP ,apr_table_get(pAuthSession,"RemoteIP"));
return HTTP_UNAUTHORIZED;
}
}
/* set env var MCAC_ to the information session value */
apr_table_do(Auth_memCookie_DoSetEnv, r, pAuthSession, NULL);
/* set REMOTE_USER var for scripts language */
apr_table_setn(r->subprocess_env, "REMOTE_USER", apr_table_get(pAuthSession,"UserName"));
/* set MCAC-SESSIONKEY var for scripts language */
apr_table_setn(r->subprocess_env, "MCAC_SESSIONKEY", szCookieValue);
/* set in http header the session value */
if (conf->nAuth_memCookie_SetSessionHTTPHeader)
apr_table_do(Auth_memCookie_DoSetHeader, r, pAuthSession, NULL);
/* log authorisation ok */
ap_log_rerror(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r, ERRTAG "authentication ok");
/* fix http header for php */
if (conf->nAuth_memCookie_authbasicfix)
fix_headers_in(r, apr_table_get(pAuthSession, "Password"));
/* if all is ok return auth ok */
return OK;
}
/**************************************************
* authentification phase:
* Checking authoriszation for user and group of the authenticated cookie
**************************************************/
static int Auth_memCookie_check_auth(request_rec *r)
{
strAuth_memCookie_config_rec *conf=NULL;
char *szMyUser=r->user;
char *szUser;
int m = r->method_number;
const apr_array_header_t *reqs_arr=NULL;
require_line *reqs=NULL;
register int x;
const char *szRequireLine;
char *szRequire_cmd;
char *szGroup;
const char *szGroups;
apr_table_t *pAuthSession=NULL;
apr_status_t tRetStatus;
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "ap_hook_auth_checker in");
/* get apache config */
conf = ap_get_module_config(r->per_dir_config, &auth_memcookie_module);
/* check if module are authoritative */
if (!conf->nAuth_memCookie_Authoritative)
return DECLINED;
/* check if module are authoritative in group check */
if (!conf->nAuth_memCookie_GroupAuthoritative)
return DECLINED;
if ((tRetStatus = apr_pool_userdata_get((void**)&pAuthSession, "SESSION", r->pool))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,ERRTAG "apr_pool_userdata_get Apr Error: %d", tRetStatus);
return HTTP_FORBIDDEN;
}
/* get require line */
reqs_arr = ap_requires(r);
reqs = reqs_arr ? (require_line *) reqs_arr->elts : NULL;
/* decline if no require line found */
if (!reqs_arr)
return DECLINED;
/* walk throug the array to check eatch require command */
for (x = 0; x < reqs_arr->nelts; x++) {
if (!(reqs[x].method_mask & (AP_METHOD_BIT << m)))
continue;
/* get require line */
szRequireLine = reqs[x].requirement;
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "Require Line is '%s'", szRequireLine);
/* get the first word in require line */
szRequire_cmd = ap_getword_white(r->pool, &szRequireLine);
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "Require Cmd is '%s'", szRequire_cmd);
/* if require cmd are valid-user, they are already authenticated than allow and return OK */
if (!strcmp("valid-user",szRequire_cmd)) {
ap_log_rerror(APLOG_MARK,APLOG_DEBUG|APLOG_NOERRNO, 0,r,ERRTAG "Require Cmd valid-user");
return OK;
} else if (!strcmp("user", szRequire_cmd)) {
/* check the required user */
szUser = ap_getword_conf(r->pool, &szRequireLine);
if (strcmp(szMyUser, szUser)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, ERRTAG "the user logged '%s' is not the user required '%s'",szMyUser,szUser);
return HTTP_FORBIDDEN;
}
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "the user logged '%s' is authorized", szMyUser);
return OK;
} else if (!strcmp("group", szRequire_cmd)) {
szGroups = apr_table_get(pAuthSession, "Groups");
szGroup = ap_getword_white(r->pool, &szRequireLine);
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "check group '%s' in '%s'",szGroup,szGroups);
if (szGroups == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, ERRTAG "user %s not in group", szMyUser);
return HTTP_FORBIDDEN;
}
if (get_Auth_memCookie_grp(r, szGroup, szGroups) != OK) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, ERRTAG "user %s not in right group", szMyUser);
return HTTP_FORBIDDEN;
}
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r, ERRTAG "the user logged '%s' as the good group %s and is authorized",szMyUser,szGroup);
return OK;
}
}
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r, ERRTAG "the user logged '%s' is not authorized",szMyUser);
/* forbid by default */
return HTTP_FORBIDDEN;
}
static int memcookie_sink_filter(ap_filter_t *f, apr_bucket_brigade *in)
{
return APR_SUCCESS;
}
/**************************************************
* register module hook
**************************************************/
static void register_hooks(apr_pool_t *p)
{
ap_register_output_filter("MEMCOOKIE_SINK", memcookie_sink_filter, NULL, AP_FTYPE_CONTENT_SET + 1);
ap_hook_check_user_id(Auth_memCookie_check_cookie, NULL, NULL, APR_HOOK_FIRST);
ap_hook_auth_checker(Auth_memCookie_check_auth, NULL, NULL, APR_HOOK_FIRST);
}
/************************************************************************************
* Apache CONFIG Phase:
************************************************************************************/
static void *create_Auth_memCookie_dir_config(apr_pool_t *p, char *d)
{
strAuth_memCookie_config_rec *conf = apr_palloc(p, sizeof(*conf));
conf->szAuth_memCookie_memCached_addr = apr_pstrdup(p,"127.0.0.1:11211");
conf->szAuth_memCookie_CookieName = apr_pstrdup(p,"AuthMemCookie");
conf->szAuth_memCookie_CookieDomain = 0;
conf->tAuth_memCookie_MemcacheObjectExpiry = 3600; /* memcache object expire time, 1H by default */
conf->nAuth_memCookie_MemcacheObjectExpiryReset = 1; /* fortress is secure by default, reset object expire time in memcache by default */
conf->nAuth_memCookie_MatchIP_Mode = 0; /* method used in matchip, use (0) remote ip by default, if set to 1 for use ip from x_forwarded_for http header and 2 for use Via http header */
conf->nAuth_memCookie_GroupAuthoritative = 1; /* group are handled by this module by default */
conf->nAuth_memCookie_Authoritative = 0; /* not by default */
conf->nAuth_memCookie_authbasicfix = 1; /* fix header for php auth by default */
conf->nAuth_memCookie_SetSessionHTTPHeader = 0; /* set session information in http header of authenticated user */
conf->nAuth_memCookie_SetSessionHTTPHeaderEncode = 1; /* encode http header groups value by default */
conf->nAuth_memCookie_SessionTableSize=10; /* Max number of element in session information table, 10 by default */
conf->szAuth_memCookie_AuthentificationURI = 0;
conf->szAuth_memCookie_AuthentificationHeader = 0;
conf->szAuth_memCookie_SessionHeaders = 0;
conf->szAuth_memCookie_CommandHeader = 0;
conf->nAuth_memCookie_AllowAnonymous = 0;
conf->nAuth_memCookie_AuthentificationURIOnlyAuth = 0;
return conf;
}
static const char *cmd_MatchIP_Mode(cmd_parms *cmd, void *InDirConf, const char *p1) {
strAuth_memCookie_config_rec *conf = (strAuth_memCookie_config_rec*)InDirConf;
if ((strcasecmp("1", p1) == 0) || (strcasecmp("X-Forwarded-For", p1) == 0)) {
conf->nAuth_memCookie_MatchIP_Mode = 1;
} else if ((strcasecmp("2", p1) == 0) || (strcasecmp("Via", p1) == 0)) {
conf->nAuth_memCookie_MatchIP_Mode = 2;
} else if ((strcasecmp("3", p1) == 0) || (strcasecmp("RemoteIP", p1) == 0)) {
conf->nAuth_memCookie_MatchIP_Mode = 3;
} else {
conf->nAuth_memCookie_MatchIP_Mode = 0;
}
return NULL;
}
/* apache config fonction of the module */
static const command_rec Auth_memCookie_cmds[] =
{
AP_INIT_TAKE1("Auth_memCookie_Memcached_AddrPort", ap_set_string_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, szAuth_memCookie_memCached_addr),
OR_AUTHCFG, "ip or host adressei(s) and port (':' separed) of memcache(s) daemon to be used, coma separed"),
AP_INIT_TAKE1("Auth_memCookie_Memcached_SessionObject_ExpireTime", ap_set_int_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, tAuth_memCookie_MemcacheObjectExpiry),
OR_AUTHCFG, "Session object in memcached expiry time, in secondes."),
AP_INIT_TAKE1("Auth_memCookie_SessionTableSize", ap_set_int_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_SessionTableSize),
OR_AUTHCFG, "Max number of element in session information table. 10 by default"),
AP_INIT_FLAG ("Auth_memCookie_Memcached_SessionObject_ExpiryReset", ap_set_flag_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_MemcacheObjectExpiryReset),
OR_AUTHCFG, "Set to 'no' to not reset object expiry time in memcache... yes by default"),
AP_INIT_FLAG ("Auth_memCookie_SetSessionHTTPHeader", ap_set_flag_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_SetSessionHTTPHeader),
OR_AUTHCFG, "Set to 'yes' to set session information to http header of the authenticated users, no by default"),
AP_INIT_FLAG ("Auth_memCookie_SetSessionHTTPHeaderEncode", ap_set_flag_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_SetSessionHTTPHeaderEncode),
OR_AUTHCFG, "Set to 'yes' to mime64 encode session information to http header, no by default"),
AP_INIT_TAKE1("Auth_memCookie_CookieName", ap_set_string_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, szAuth_memCookie_CookieName),
OR_AUTHCFG, "Name of cookie to set"),
AP_INIT_TAKE1 ( "Auth_memCookie_MatchIP_Mode", cmd_MatchIP_Mode,
NULL,
OR_AUTHCFG, "To check cookie ip adresse, Set to '1' to use 'X-Forwarded-For' http header, to '2' to use 'Via' http header, and to '3' to use apache remote_ip. set to '0' by default to desactivate the ip check."),
AP_INIT_FLAG ("Auth_memCookie_GroupAuthoritative", ap_set_flag_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_GroupAuthoritative),
OR_AUTHCFG, "Set to 'no' to allow access control to be passed along to lower modules, for group acl check, set to 'yes' by default."),
AP_INIT_FLAG ("Auth_memCookie_Authoritative", ap_set_flag_slot,
(void *)APR_OFFSETOF(strAuth_memCookie_config_rec, nAuth_memCookie_Authoritative),