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Add option to patch for IPv6 address support.

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This commit is contained in:
Jun Kuriyama 2012-12-24 12:42:56 +00:00
parent a32e5104bf
commit a35abc0eaf
Notes: svn2git 2021-03-31 03:12:20 +00:00 
svn path=/head/; revision=309457
3 changed files with 936 additions and 2 deletions
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20
www/mod_extract_forwarded/Makefile
View File

@ -3,7 +3,7 @@
PORTNAME= mod_extract_forwarded
PORTVERSION= 2.0.2
PORTREVISION= 3
PORTREVISION= 4
CATEGORIES= www
MASTER_SITES= http://www.openinfo.co.uk/apache/
DISTNAME= extract_forwarded-${DISTVERSION}
@ -11,15 +11,31 @@ DISTNAME= extract_forwarded-${DISTVERSION}
MAINTAINER= kuriyama@FreeBSD.org
COMMENT= An Apache module that can make proxied requests appear with client IP
OPTIONS_DEFINE= YOSHFUJI
YOSHFUJI_DESC= yoshfuji patch (support IPv6 addr in config, etc)
#OPTIONS_DEFAULT= YOSHFUJI
USE_APACHE= 22
WRKSRC= ${WRKDIR}/extract_forwarded
PORTDOCS= INSTALL README
MAKE_JOBS_SAFE= yes
CONFLICTS= mod_extract_forwarded-1.*
PATCH_STRIP= -p1
AP_FAST_BUILD= yes
AP_GENPLIST= yes
# Workaround for UNIQUENAME v.s. OptionsNG problem.
# http://lists.freebsd.org/pipermail/freebsd-ports/2012-June/075466.html
UNIQUENAME= ap22-${PORTNAME}
.include <bsd.port.options.mk>
.if ${PORT_OPTIONS:MYOSHFUJI}
EXTRA_PATCHES= ${FILESDIR}/extra-patch-yoshfuji
.else
EXTRA_PATCHES= ${FILESDIR}/extra-patch-mod_extract_forwarded.c
.endif
post-install:
.if !defined(NOPORTDOCS)
${MKDIR} ${DOCSDIR}/

0
www/mod_extract_forwarded/files/patch-mod_extract_forwarded.c → www/mod_extract_forwarded/files/extra-patch-mod_extract_forwarded.c
View File

918
www/mod_extract_forwarded/files/extra-patch-yoshfuji Normal file
View File

@ -0,0 +1,918 @@
# $FreeBSD$
diff --git a/INSTALL b/INSTALL
index fa06d8a..d1f6d56 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,11 +13,12 @@ to build and install a DSO version of the module:
/usr/local/apache2/bin/apxs -c -i -a mod_extract_forwarded.c
-If the Apache instance you are adding mod_extract_forwarded to will not
-have mod_proxy and proxy_http loaded then you will get an error when
-mod_extract_forwarded is loaded. In that case edit
-mod_extract_forwarded.c and comment out the #define for
-USING_proxy_http_module or change it to an an #undef. If you
-subsequently run Apache with proxy_http do not forget to reinstate the
-#define; failure to do so will mean that any X-Fowarded-For header
-inserted by proxy_http will use the spoofed IP number in error.
+If the Apache instance you are adding mod_extract_forwarded to will
+have mod_proxy and proxy_http loaded then you need to build and
+install a DSO version of the module:
+
+/usr/local/apache2/bin/apxs -c -i -a mod_extract_forwarded_proxy.c
+
+Without this module, any X-Fowarded-For header inserted by proxy_http
+will use the spoofed IP number.
+
diff --git a/mod_extract_forwarded.c b/mod_extract_forwarded.c
index afecbcf..fa94493 100644
--- a/mod_extract_forwarded.c
+++ b/mod_extract_forwarded.c
@@ -84,6 +84,9 @@
* of what is done by the module as an aid to understanding fixing problems
* with this code; this is NOT for production use because of the volume of
* output it will generate and the way it flushes stderr
+ * 8. Support IPv6: If real connection is served by IPv6 socket, both IPv4 and
+ * IPv6 clients are supported. If real connection is served by IPv4 socket,
+ * only IPv4 clients are supported. [yoshfuji]
*
* History of Apache 2 compatible mod_extract_forwarded
* ----------------------------------------------------
@@ -98,7 +101,8 @@
* Cleaned up interpretation of per_der_config
* for internal redirect and subrequests and
* other logic tidying
- *
+ * 12 Apr 2009 Apache 2.2 support. [yoshfuji]
+ * 16 Apr 2009 IPv6 support. [yoshfuji]
*/
#include "httpd.h"
@@ -110,22 +114,13 @@
#include "http_request.h"
#include "util_script.h"
#include "http_connection.h"
-#include "mod_proxy.h"
#include "apr_strings.h"
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
-/*
- * #define USING_proxy_http_module if proxy_http.c module is either
- * compiled into Apache 2 or it is being loaded as a DSO. If proxy_http.c
- * module is not loaded then this module will generate an error when and
- * if it is loaded as a DSO. In that case comment out the #define, recompile
- * and reinstall this module. BUT do not forget to change things back if
- * proxy_http.c module is reinstated
- */
-#define USING_proxy_http_module 1
+#include "mod_extract_forwarded.h"
/*--------------------------------------------------------------------------*/
/* */
@@ -139,17 +134,6 @@
*/
module AP_MODULE_DECLARE_DATA extract_forwarded_module;
-/*
- * Per directory configuration record.
- */
-typedef struct {
- int order; /* order in which the accept and refuse specs are applied */
- int debug; /* debug output to error log flag */
- const char *envar; /* name of env var to add */
- apr_table_t *accept_proxies; /* proxies to trust */
- apr_table_t *refuse_proxies; /* proxies to distrust */
-} mef_config;
-
/*
* Two possible orders in which the accept and refuse specs are applied
*/
@@ -279,72 +263,41 @@ static const char *mef_debug_control(cmd_parms *cparms, void *mconfig,
}
/*
- * Given an IP or 'all' as "arg", add it to the accept_proxies table
+ * Given an IP or 'all' as "arg", add it to the accept_proxies/refuse_proxies
+ * table
*/
-static const char *mef_accept_proxy(cmd_parms *cparms, void *mconfig,
+static const char *mef_config_proxy(cmd_parms *cparms, void *mconfig,
const char *arg)
{
mef_config *conf = (mef_config *)mconfig;
- struct hostent *hptr = NULL;
- char** haddr;
+ apr_table_t *conf_proxies = cparms->info ?
+ conf->accept_proxies : conf->refuse_proxies;
if (strcasecmp(arg, "all") == 0)
/* "all" keyword replaces everything with just itself */
{
- apr_table_clear(conf->accept_proxies);
- apr_table_set(conf->accept_proxies, arg, "t");
+ apr_table_clear(conf_proxies);
+ apr_table_set(conf_proxies, arg, "t");
}
else
- /* Add IP to list of accepted proxies */
+ /* Add IP to list of accepted/refuse proxies */
{
- hptr = gethostbyname(arg);
- if (hptr)
+ apr_sockaddr_t *sa0, *sa;
+ if (apr_sockaddr_info_get(&sa0, arg, APR_UNSPEC, 0, 0,
+ cparms->temp_pool) == APR_SUCCESS)
{
- apr_table_unset(conf->accept_proxies, "all");
- for (haddr=hptr->h_addr_list; *haddr; haddr++)
+ apr_table_unset(conf_proxies, "all");
+ for (sa = sa0; sa; sa = sa->next)
{
- apr_table_set(conf->accept_proxies,
- inet_ntoa(*((struct in_addr*)(*haddr))), "t");
+ char *ipaddr;
+ if (apr_sockaddr_ip_get(&ipaddr, sa) == APR_SUCCESS)
+ {
+ apr_table_set(conf_proxies, ipaddr, "t");
+ }
}
- }
- else
- {
- return "No 'all' or valid IP identified by MEFaccept";
}
- }
- return NULL;
-}
-
-/*
- * Given an IP or 'all' as "arg", add it to the refused_proxies table
- */
-static const char *mef_refuse_proxy(cmd_parms *cparms, void *mconfig,
- const char *arg)
-{
- mef_config *conf = (mef_config *) mconfig;
- struct hostent *hptr = NULL;
- char** haddr;
- if (strcasecmp(arg, "all") == 0)
- /* "all" keyword replaces everything with just itself */
- {
- apr_table_clear(conf->refuse_proxies);
- apr_table_set(conf->refuse_proxies, arg, "t");
- }
- else
- /* Add IP to list of refused proxies */
- {
- hptr = gethostbyname(arg);
- if (hptr)
- {
- apr_table_unset(conf->refuse_proxies, "all");
- for (haddr=hptr->h_addr_list; *haddr; haddr++)
- {
- apr_table_set(conf->refuse_proxies,
- inet_ntoa(*((struct in_addr*)(*haddr))), "t");
- }
- }
- else
+ else
{
- return "No 'all' or valid IP identified by MEFrefuse";
+ return "No 'all' or valid IP identified by MEFaccept / MEFrefuse";
}
}
return NULL;
@@ -385,54 +338,6 @@ static int acceptable_proxy(mef_config *conf, char *proxy_ip)
return 0;
}
-/*
- * The MEFsave_rec data structure is used to preserve information that
- * this module has modified in the conn_rec associated with a request
- * so that the conn_rec can be restored to its original state as needed.
- * It also carries information between transaction phases and internal
- * redirects and subrequests
- */
-typedef struct MEFsave_rec MEFsave_rec;
-
-struct MEFsave_rec {
- conn_rec *connection; /* connection record being used */
- in_addr_t orig_in_addr; /* original remote in_addr_t */
- in_addr_t new_in_addr; /* modified remote in_addr_t */
- char *orig_remote_ip; /* original remote_ip */
- char *new_remote_ip; /* modified remote_ip */
- int conn_rec_mod_state; /* conn_rec modification state */
- int debug; /* are we printing MEF debug */
- const char *envar; /* name of env var to add */
- void *per_dir_config; /* per_dir_config applicable */
- MEFsave_rec *other_saved; /* any preceding req's save_rec */
- request_rec *other_r; /* any preceding req's request_rec */
-};
-
-#define CONN_REC_MODIFIED 1
-#define CONN_REC_RESTORED 0
-
-/*
- * remote_in_addr returns a pointer to the in_addr_t which specifes
- * the IP of the remote end of the connection supporting the specified
- * request. NULL is returned if this cannot be determined.
- */
-static in_addr_t *get_remote_in_addr(conn_rec *conn)
-{
- in_addr_t *result = NULL;
- if (conn->remote_addr->family == AF_INET)
- {
- result = &(conn->remote_addr->sa.sin.sin_addr.s_addr);
- }
-#if defined(AF_INET6) && defined(IN6_IS_ADDR_V4MAPPED)
- if (conn->remote_addr->family == AF_INET6 &&
- IN6_IS_ADDR_V4MAPPED(&conn->remote_addr->sa.sin6.sin6_addr))
- {
- result = &(((uint32_t *)conn->remote_addr->ipaddr_ptr)[3]);
- }
-#endif
- return result;
-}
-
/* Forward declared for convenience */
static apr_status_t cleanup_initial(void *data);
static apr_status_t cleanup_not_initial(void *data);
@@ -446,22 +351,12 @@ static apr_status_t cleanup_not_initial(void *data);
*/
static int spoof_initial(request_rec *r, char *spoof_ip, char *phase)
{
- in_addr_t *remote_in_addr;
MEFsave_rec *saved;
mef_config *conf = ap_get_module_config(r->per_dir_config,
&extract_forwarded_module);
- /* Validate and acquire pointer to the remote in_addr_t */
- if ((remote_in_addr = get_remote_in_addr(r->connection)) == NULL)
- {
- /* Could not get a valid value so give up */
- if (conf->debug == MEF_DEBUG_ON)
- {
- fprintf(stderr,"MEF: phase:%s, si problem acquiring remote_in_addr\n",
- phase);
- fflush(stderr);
- }
- return DECLINED;
- }
+ apr_sockaddr_t *sa;
+ apr_port_t port;
+
/*
* We can proceed to do the spoof
*
@@ -470,9 +365,40 @@ static int spoof_initial(request_rec *r, char *spoof_ip, char *phase)
saved = apr_pcalloc(r->pool, sizeof(MEFsave_rec));
/* Then the saving */
saved->connection = r->connection;
- saved->orig_in_addr = *remote_in_addr;
+ saved->orig_addr = *r->connection->remote_addr;
saved->orig_remote_ip = r->connection->remote_ip;
- saved->new_in_addr = inet_addr(spoof_ip);
+
+ /* setup new address
+ * it's easy if address family is not changed.
+ */
+ port = r->connection->remote_addr->port;
+ if (apr_sockaddr_info_get(&sa, spoof_ip,
+ r->connection->remote_addr->family, port,
+ 0, r->pool) != APR_SUCCESS)
+ {
+#if APR_HAVE_IPV6
+ /* Try inter-family conversion.
+ * If if the real connection is served via ipv4, it
+ * implies Give up if connection is ipv4 and real client is ipv6.
+ */
+ char *buf;
+ if (r->connection->remote_addr->family != APR_INET6)
+ {
+ return DECLINED;
+ }
+ buf = apr_palloc(r->pool, strlen(spoof_ip) + sizeof("::ffff:"));
+ sprintf(buf, "::ffff:%s", spoof_ip);
+ if (apr_sockaddr_info_get(&sa, buf, APR_INET6, port,
+ 0, r->pool) != APR_SUCCESS)
+ {
+ return DECLINED;
+ }
+#else
+ return DECLINED;
+#endif
+ }
+
+ saved->new_addr = *sa;
saved->new_remote_ip = spoof_ip;
saved->per_dir_config = r->per_dir_config;
saved->debug = conf->debug;
@@ -480,7 +406,7 @@ static int spoof_initial(request_rec *r, char *spoof_ip, char *phase)
saved->other_saved = NULL;
saved->other_r = NULL;
/* Then the modifying of the conn_rec */
- *remote_in_addr = saved->new_in_addr;
+ *saved->connection->remote_addr = saved->new_addr;
saved->connection->remote_ip = saved->new_remote_ip;
saved->conn_rec_mod_state = CONN_REC_MODIFIED;
/* Force re-evaluation of the remote_host value */
@@ -520,7 +446,6 @@ static int spoof_initial(request_rec *r, char *spoof_ip, char *phase)
static int spoof_not_initial(request_rec *this_r, request_rec *other_r,
char *phase)
{
- in_addr_t *remote_in_addr;
MEFsave_rec *saved;
MEFsave_rec *other_saved;
/*
@@ -540,10 +465,9 @@ static int spoof_not_initial(request_rec *this_r, request_rec *other_r,
saved = apr_pcalloc(this_r->pool, sizeof(MEFsave_rec));
/* Then the copying */
saved->connection = other_saved->connection;
- remote_in_addr = get_remote_in_addr(saved->connection);
- saved->orig_in_addr = other_saved->orig_in_addr;
+ saved->orig_addr = other_saved->orig_addr;
saved->orig_remote_ip = other_saved->orig_remote_ip;
- saved->new_in_addr = other_saved->new_in_addr;
+ saved->new_addr = other_saved->new_addr;
saved->new_remote_ip = other_saved->new_remote_ip;
saved->per_dir_config = other_saved->per_dir_config;
saved->debug = other_saved->debug;
@@ -552,7 +476,11 @@ static int spoof_not_initial(request_rec *this_r, request_rec *other_r,
saved->other_saved = other_saved;
saved->other_r = other_r;
/* Ensure the conn_rec is spoofed */
- *remote_in_addr = saved->new_in_addr;
+ if (saved->connection->remote_addr->family != saved->new_addr.family)
+ {
+ return DECLINED;
+ }
+ *saved->connection->remote_addr = saved->new_addr;
this_r->connection->remote_ip = saved->new_remote_ip;
saved->conn_rec_mod_state = CONN_REC_MODIFIED;
/* Force re-evaluation of the remote_host value */
@@ -589,16 +517,11 @@ static int spoof_not_initial(request_rec *this_r, request_rec *other_r,
* The undo_spoof() function undoes the changes made to a conn_rec
* by spoof_initial() or spoof_not_initial()
*/
-static int undo_spoof(MEFsave_rec *saved, request_rec *r, char *phase)
+int extract_forwarded_undo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase)
{
- in_addr_t *remote_in_addr;
- if ((remote_in_addr = get_remote_in_addr(saved->connection)) == NULL)
- {
- /* Could not get a valid value so give up */
- return DECLINED;
- }
/* Do the restoring */
- *remote_in_addr = saved->orig_in_addr;
+ *saved->connection->remote_addr = saved->orig_addr;
saved->connection->remote_ip = saved->orig_remote_ip;
saved->connection->remote_host = NULL;
ap_get_remote_host(saved->connection, saved->per_dir_config,
@@ -641,16 +564,11 @@ static int undo_spoof(MEFsave_rec *saved, request_rec *r, char *phase)
* subordinate, request_rec which is (should be) using the same
* conn_rec as the primary request
*/
-static int redo_spoof(MEFsave_rec *saved, request_rec *r, char *phase)
+int extract_forwarded_redo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase)
{
- in_addr_t *remote_in_addr;
- if ((remote_in_addr = get_remote_in_addr(saved->connection)) == NULL)
- {
- /* Could not get a valid value so give up */
- return DECLINED;
- }
/* Modify it all again */
- *remote_in_addr = saved->new_in_addr;
+ *saved->connection->remote_addr = saved->new_addr;
saved->connection->remote_ip = saved->new_remote_ip;
saved->connection->remote_host = NULL;
ap_get_remote_host(saved->connection, saved->per_dir_config,
@@ -704,7 +622,7 @@ static int redo_spoof(MEFsave_rec *saved, request_rec *r, char *phase)
static int cleanup_initial(void *data)
{
MEFsave_rec *saved = (MEFsave_rec *)data;
- return undo_spoof(saved, NULL, "cleanup initial");
+ return extract_forwarded_undo_spoof(saved, NULL, "cleanup initial");
}
static int cleanup_not_initial(void *data)
@@ -712,13 +630,15 @@ static int cleanup_not_initial(void *data)
MEFsave_rec *saved = (MEFsave_rec *)data;
if (saved->other_saved->conn_rec_mod_state == CONN_REC_MODIFIED)
{
- return redo_spoof(saved->other_saved, saved->other_r,
- "cleanup not initial");
+ return extract_forwarded_redo_spoof(saved->other_saved,
+ saved->other_r,
+ "cleanup not initial");
}
else
{
- return undo_spoof(saved->other_saved, saved->other_r,
- "cleanup not initial");
+ return extract_forwarded_undo_spoof(saved->other_saved,
+ saved->other_r,
+ "cleanup not initial");
}
}
@@ -758,7 +678,7 @@ static int primary_request(request_rec *r, char *phase)
{
if (conf->debug == MEF_DEBUG_ON)
{
- fprintf(stderr,"MEF: phase:%s, $s not acceptabler proxy, %s\n",
+ fprintf(stderr,"MEF: phase:%s, %s not acceptabler proxy, %s\n",
phase, conn->remote_ip, r->unparsed_uri);
fflush(stderr);
}
@@ -917,66 +837,6 @@ static int mef_access_check(request_rec *r)
return mef_composite(r, "access check");
}
-/*
- * mef_before_proxy_http() is called if Apache 2's HTTP proxy_http handler
- * is about to act and undoes the spoofing of the conn_rec associated with
- * the incoming request if the proxy is about to add information to the
- * request's X-Forwarded-For header. Without this the wrong IP (the
- * spoof one) is added to the X-Forwarded-For header.
- */
-static int mef_before_proxy_http(request_rec *r,
- proxy_server_conf *pconf,
- char *url, const char *proxyname,
- apr_port_t proxyport)
-{
- MEFsave_rec *saved;
- /*
- * If our post-read-request handler did something we may have to too
- */
- if ((saved = (MEFsave_rec *)ap_get_module_config(r->request_config,
- &extract_forwarded_module)) != NULL)
- {
- /*
- * If proxy_http is going to add X-Forwarded-For info then we have
- * have to undo the changes we made earlier so proxy_http can get
- * it right
- */
- if (PROXYREQ_REVERSE == r->proxyreq)
- {
- undo_spoof(saved, r, "before proxy http");
- }
- }
- return DECLINED;
-}
-
-/*
- * mef_logging() is used to redo the spoofing of the conn_rec associated
- * with the incoming request if was undone.
- * Redoing the spoof is to ensure that the spoof IP is used for logging
- * information about the request
- */
-static int mef_logging(request_rec *r)
-{
- MEFsave_rec *saved;
- /*
- * If our post-read-request handler did something we may have to too
- */
- if ((saved = (MEFsave_rec *)ap_get_module_config(r->request_config,
- &extract_forwarded_module)) != NULL)
- {
- /*
- * If we undid the spoof, probably because proxy_http was adding
- * X-Forwarded-For info, then we want to redo the changes we
- * undid so the spook IP is logged
- */
- if (saved->conn_rec_mod_state == CONN_REC_RESTORED)
- {
- redo_spoof(saved, r, "logging");
- }
- }
- return DECLINED;
-}
-
/*--------------------------------------------------------------------------*/
/* */
/* Data structures pulling all the mef module's bits together */
@@ -996,16 +856,6 @@ static void mef_register_hooks(apr_pool_t *p)
* ap_hook_header_parser(mef_header_parser, NULL, NULL, APR_HOOK_FIRST);
*/
ap_hook_access_checker(mef_access_check, NULL, NULL, APR_HOOK_FIRST);
-#ifdef USING_proxy_http_module
- /*
- * Only need to register the following handlers if proxy_http_module
- * is going to be loaded
- */
- static const char *const mef_proxy_b4[] = { "proxy_http.c", NULL };
- proxy_hook_scheme_handler(mef_before_proxy_http, NULL, mef_proxy_b4,
- APR_HOOK_FIRST);
- ap_hook_log_transaction(mef_logging, NULL, NULL, APR_HOOK_FIRST);
-#endif /* USING_proxy_http_module */
}
/*
@@ -1015,6 +865,8 @@ static void mef_register_hooks(apr_pool_t *p)
* translation and hence directory information is unavailable for the
* request.
*/
+static char its_an_accept;
+
static const command_rec mef_cmds[] =
{
AP_INIT_TAKE1(
@@ -1043,15 +895,15 @@ static const command_rec mef_cmds[] =
),
AP_INIT_ITERATE(
"MEFaccept", /* directive name */
- mef_accept_proxy, /* config action routine */
- NULL, /* argument to include in call */
+ mef_config_proxy, /* config action routine */
+ &its_an_accept, /* argument to include in call */
RSRC_CONF, /* where available */
/* description */
"One or more proxy names or IPs to accept, or 'all'"
),
AP_INIT_ITERATE(
"MEFrefuse", /* directive name */
- mef_refuse_proxy, /* config action routine */
+ mef_config_proxy, /* config action routine */
NULL, /* argument to include in call */
RSRC_CONF, /* where available */
/* description */
diff --git a/mod_extract_forwarded.conf b/mod_extract_forwarded.conf
new file mode 100644
index 0000000..b5606a5
--- /dev/null
+++ b/mod_extract_forwarded.conf
@@ -0,0 +1,52 @@
+<IfModule mod_extract_forwarded.c>
+ # MEForder:
+ # This can have either of two value 'refuse,accept' or
+ # 'accept,refuse' and specifies the order in which the
+ # information in two associated directives, MEFaccept
+ # and MEFrefuse, are intepreted. The MEFaccept and
+ # MEFrefuse directives are each used to spcifiy one or
+ # more IP numbers.
+ MEForder refuse,accept
+
+ # MEFrefuse:
+ # This can be 'all' OR a space separated list of IP numbers
+ # and/or domain names of trusted proxy servers whose IP number
+ # can be derived by DNS from the domain name. The presence of
+ # 'all' overrides any particular IP numbers and means
+ # that no proxy servers are to be trusted. Individual IP
+ # numbers mean that those the proxy servers having them
+ # are not to be trusted. This defaults to 'all'.
+ MEFrefuse all
+
+ # MEFaccept:
+ # This can be 'all' OR a space separated list of IP numbers
+ # and/or domain names of trusted proxy servers whose IP number
+ # can be derived by DNS from the domain name. The presence of
+ # 'all' overrides any particular IP numbers and means
+ # that all proxy servers are to be trusted. Individual IP
+ # numbers mean that those the proxy servers having them
+ # are to be trusted. This defaults to an empty list of
+ # trusted IP numbers.
+ # MEFaccept <trusted proxy servers' IP numbers>
+
+ # MEFaddenv:
+ # This can be 'off', 'on' (the default) or a string. 'off'
+ # means that when spoofing, do not add an environment variable
+ # whose value is the IP number of the connecting machine.
+ # 'on' means that when spoofing, add an environment variable
+ # called 'MEF_RPROXY_ADDR' whose value is the IP number of the
+ # connecting machine. A string means that when spoofing, add
+ # an environment variable named by the string supplied whose
+ # value is the IP number of the connecting machine.
+
+ # MEFdebug:
+ # This can be 'on' or 'off' (the default). When turned 'on'
+ # information about how the mod_extract_forwarded module is
+ # processing every request to your Apache 2 server, and any
+ # associated internal redirects or subsrequests, is written
+ # to the server's error_log. Thhe amount of output written
+ # and the way it is generated is such that you would never
+ # normally want to turn this feature on. This feature is
+ # intended for debugging operation of the mod_extract_forwarded
+ # mod_module and it is unlikely you will want to do that.
+</IfModule>
diff --git a/mod_extract_forwarded.h b/mod_extract_forwarded.h
new file mode 100644
index 0000000..96b49a1
--- /dev/null
+++ b/mod_extract_forwarded.h
@@ -0,0 +1,131 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ * if any, must include the following acknowledgment:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowledgment may appear in the software itself,
+ * if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" must
+ * not be used to endorse or promote products derived from this
+ * software without prior written permission. For written
+ * permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ * nor may "Apache" appear in their name, without prior written
+ * permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+#ifndef MOD_EXTRACT_FORWARDED_H
+#define MOD_EXTRACT_FORWARDED_H
+
+#include "mod_proxy.h"
+#include "mod_extract_forwarded.h"
+
+extern module AP_MODULE_DECLARE_DATA extract_forwarded_module;
+
+/*
+ * Per directory configuration record.
+ */
+typedef struct {
+ int order; /* order in which the accept and refuse specs are applied */
+ int debug; /* debug output to error log flag */
+ const char *envar; /* name of env var to add */
+ apr_table_t *accept_proxies; /* proxies to trust */
+ apr_table_t *refuse_proxies; /* proxies to distrust */
+} mef_config;
+
+/*
+ * Two possible orders in which the accept and refuse specs are applied
+ */
+#define REFUSE_THEN_ACCEPT 0
+#define ACCEPT_THEN_REFUSE 1
+
+/*
+ * To output debug info to error log or not
+ */
+#define MEF_DEBUG_OFF 0
+#define MEF_DEBUG_ON 1
+
+/*
+ * Maximum number of IPs in an X-Forwarded-For header of a request before
+ * it is treated a excessive and hence absurd
+ */
+#define MEF_ABSURD_PROXY_LIMIT 32
+/*
+ * Default environment variable name
+ */
+#define MEF_PROXY_ADDR "MEF_PROXY_ADDR"
+
+/*
+ * The MEFsave_rec data structure is used to preserve information that
+ * this module has modified in the conn_rec associated with a request
+ * so that the conn_rec can be restored to its original state as needed.
+ * It also carries information between transaction phases and internal
+ * redirects and subrequests
+ */
+typedef struct MEFsave_rec MEFsave_rec;
+
+struct MEFsave_rec {
+ conn_rec *connection; /* connection record being used */
+ apr_sockaddr_t orig_addr; /* original remote address */
+ apr_sockaddr_t new_addr; /* modified remote address */
+ char *orig_remote_ip; /* original remote_ip */
+ char *new_remote_ip; /* modified remote_ip */
+ int conn_rec_mod_state; /* conn_rec modification state */
+ int debug; /* are we printing MEF debug */
+ const char *envar; /* name of env var to add */
+ void *per_dir_config; /* per_dir_config applicable */
+ MEFsave_rec *other_saved; /* any preceding req's save_rec */
+ request_rec *other_r; /* any preceding req's request_rec */
+};
+
+#define CONN_REC_MODIFIED 1
+#define CONN_REC_RESTORED 0
+
+/*
+ * Functions provided by mod_extract_forwarded
+ */
+extern int extract_forwarded_undo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase);
+extern int extract_forwarded_redo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase);
+
+#endif
diff --git a/mod_extract_forwarded_proxy.c b/mod_extract_forwarded_proxy.c
new file mode 100644
index 0000000..1b53d36
--- /dev/null
+++ b/mod_extract_forwarded_proxy.c
@@ -0,0 +1,175 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ * if any, must include the following acknowledgment:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowledgment may appear in the software itself,
+ * if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" must
+ * not be used to endorse or promote products derived from this
+ * software without prior written permission. For written
+ * permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ * nor may "Apache" appear in their name, without prior written
+ * permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+#include "mod_proxy.h"
+
+#include "mod_extract_forwarded.h"
+
+/*
+ * The undo_spoof() function undoes the changes made to a conn_rec by
+ * spoof_initial() or spoof_not_initial()
+ */
+extern int extract_forwarded_undo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase);
+
+/*
+ * The redo_spoof() function reapplies the changes made to a
+ * conn_rec by spoof_initial() or spoof_not_initial():
+ *
+ * 1. after a prior call to undo_spoof has removed them, typically
+ * because of proxy_http reverse-proxy X-Forwarded-For issue
+ * 2. when an internal redirect or subrequest has generated a new
+ * subordinate, request_rec which is (should be) using the same
+ * conn_rec as the primary request
+ */
+extern int extract_forwarded_redo_spoof(MEFsave_rec *saved, request_rec *r,
+ char *phase);
+
+/*
+ * mef_before_proxy_http() is called if Apache 2's HTTP proxy_http handler
+ * is about to act and undoes the spoofing of the conn_rec associated with
+ * the incoming request if the proxy is about to add information to the
+ * request's X-Forwarded-For header. Without this the wrong IP (the
+ * spoof one) is added to the X-Forwarded-For header.
+ */
+static int mef_before_proxy_http(request_rec *r,
+#if AP_SERVER_MINORVERSION_NUMBER >= 2
+ proxy_worker *worker,
+#endif
+ proxy_server_conf *pconf,
+ char *url, const char *proxyname,
+ apr_port_t proxyport)
+{
+ MEFsave_rec *saved;
+ /*
+ * If our post-read-request handler did something we may have to too
+ */
+ if ((saved = (MEFsave_rec *)ap_get_module_config(r->request_config,
+ &extract_forwarded_module)) != NULL)
+ {
+ /*
+ * If proxy_http is going to add X-Forwarded-For info then we have
+ * have to undo the changes we made earlier so proxy_http can get
+ * it right
+ */
+ if (PROXYREQ_REVERSE == r->proxyreq)
+ {
+ extract_forwarded_undo_spoof(saved, r, "before proxy http");
+ }
+ }
+ return DECLINED;
+}
+
+/*
+ * mef_logging() is used to redo the spoofing of the conn_rec associated
+ * with the incoming request if was undone.
+ * Redoing the spoof is to ensure that the spoof IP is used for logging
+ * information about the request
+ */
+static int mef_logging(request_rec *r)
+{
+ MEFsave_rec *saved;
+ /*
+ * If our post-read-request handler did something we may have to too
+ */
+ if ((saved = (MEFsave_rec *)ap_get_module_config(r->request_config,
+ &extract_forwarded_module)) != NULL)
+ {
+ /*
+ * If we undid the spoof, probably because proxy_http was adding
+ * X-Forwarded-For info, then we want to redo the changes we
+ * undid so the spook IP is logged
+ */
+ if (saved->conn_rec_mod_state == CONN_REC_RESTORED)
+ {
+ redo_spoof(saved, r, "logging");
+ }
+ }
+ return DECLINED;
+}
+
+/*--------------------------------------------------------------------------*/
+/* */
+/* Data structures pulling all the mef module's bits together */
+/* */
+/*--------------------------------------------------------------------------*/
+/*
+ * mef module's functions attached to request processing hooks.
+ */
+static void mef_register_hooks(apr_pool_t *p)
+{
+ /*
+ * Only need to register the following handlers if proxy_http_module
+ * is going to be loaded
+ */
+ static const char *const mef_proxy_b4[] = { "proxy_http.c", NULL };
+ proxy_hook_scheme_handler(mef_before_proxy_http, NULL, mef_proxy_b4,
+ APR_HOOK_FIRST);
+ ap_hook_log_transaction(mef_logging, NULL, NULL, APR_HOOK_FIRST);
+}
+
+/*
+ * mef module's definition for configuration.
+ */
+module AP_MODULE_DECLARE_DATA extract_forwarded_module =
+{
+ STANDARD20_MODULE_STUFF,
+ NULL, /* per-directory config creator */
+ NULL, /* dir config merger */
+ NULL, /* server config creator */
+ NULL, /* server config merger */
+ NULL, /* command table */
+ mef_register_hooks, /* set up other request processing hooks */
+};