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-rw-r--r--modules/metadata/mod_remoteip.c1267
1 files changed, 1267 insertions, 0 deletions
diff --git a/modules/metadata/mod_remoteip.c b/modules/metadata/mod_remoteip.c
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index 0000000..045e988
--- /dev/null
+++ b/modules/metadata/mod_remoteip.c
@@ -0,0 +1,1267 @@
+/* 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.
+ *
+ * Portions of the input filter code for PROXY protocol support is
+ * Copyright 2014 Cloudzilla Inc.
+ */
+
+#include "ap_config.h"
+#include "ap_mmn.h"
+#include "ap_listen.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_connection.h"
+#include "http_protocol.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#define APR_WANT_BYTEFUNC
+#include "apr_want.h"
+#include "apr_network_io.h"
+#include "apr_version.h"
+
+module AP_MODULE_DECLARE_DATA remoteip_module;
+
+typedef struct {
+ /** A proxy IP mask to match */
+ apr_ipsubnet_t *ip;
+ /** Flagged if internal, otherwise an external trusted proxy */
+ void *internal;
+} remoteip_proxymatch_t;
+
+typedef struct remoteip_addr_info {
+ struct remoteip_addr_info *next;
+ apr_sockaddr_t *addr;
+ server_rec *source;
+} remoteip_addr_info;
+
+typedef struct {
+ /** The header to retrieve a proxy-via IP list */
+ const char *header_name;
+ /** A header to record the proxied IP's
+ * (removed as the physical connection and
+ * from the proxy-via IP header value list)
+ */
+ const char *proxies_header_name;
+ /** A list of trusted proxies, ideally configured
+ * with the most commonly encountered listed first
+ */
+ apr_array_header_t *proxymatch_ip;
+
+ remoteip_addr_info *proxy_protocol_enabled;
+ remoteip_addr_info *proxy_protocol_disabled;
+
+ apr_array_header_t *disabled_subnets;
+ apr_pool_t *pool;
+} remoteip_config_t;
+
+typedef struct {
+ apr_sockaddr_t *useragent_addr;
+ char *useragent_ip;
+ /** The list of proxy IP's ignored as remote IP's */
+ const char *proxy_ips;
+ /** The remaining list of untrusted proxied remote IP's */
+ const char *proxied_remote;
+} remoteip_req_t;
+
+/* For PROXY protocol processing */
+static ap_filter_rec_t *remoteip_filter;
+
+typedef struct {
+ char line[108];
+} proxy_v1;
+
+typedef union {
+ struct { /* for TCP/UDP over IPv4, len = 12 */
+ apr_uint32_t src_addr;
+ apr_uint32_t dst_addr;
+ apr_uint16_t src_port;
+ apr_uint16_t dst_port;
+ } ip4;
+ struct { /* for TCP/UDP over IPv6, len = 36 */
+ apr_byte_t src_addr[16];
+ apr_byte_t dst_addr[16];
+ apr_uint16_t src_port;
+ apr_uint16_t dst_port;
+ } ip6;
+ struct { /* for AF_UNIX sockets, len = 216 */
+ apr_byte_t src_addr[108];
+ apr_byte_t dst_addr[108];
+ } unx;
+} proxy_v2_addr;
+
+typedef struct {
+ apr_byte_t sig[12]; /* hex 0D 0A 0D 0A 00 0D 0A 51 55 49 54 0A */
+ apr_byte_t ver_cmd; /* protocol version and command */
+ apr_byte_t fam; /* protocol family and address */
+ apr_uint16_t len; /* number of following bytes part of the header */
+ proxy_v2_addr addr;
+} proxy_v2;
+
+typedef union {
+ proxy_v1 v1;
+ proxy_v2 v2;
+} proxy_header;
+
+static const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
+#define MIN_V1_HDR_LEN 15
+#define MIN_V2_HDR_LEN 16
+#define MIN_HDR_LEN MIN_V1_HDR_LEN
+
+/* XXX: Unsure if this is needed if v6 support is not available on
+ this platform */
+#ifndef INET6_ADDRSTRLEN
+#define INET6_ADDRSTRLEN 46
+#endif
+
+typedef struct {
+ char header[sizeof(proxy_header)];
+ apr_size_t rcvd;
+ apr_size_t need;
+ int version;
+ ap_input_mode_t mode;
+ apr_bucket_brigade *bb;
+ int done;
+} remoteip_filter_context;
+
+/** Holds the resolved proxy info for this connection and any additional
+ configurable parameters
+*/
+typedef struct {
+ /** The parsed client address in native format */
+ apr_sockaddr_t *client_addr;
+ /** Character representation of the client */
+ char *client_ip;
+} remoteip_conn_config_t;
+
+typedef enum { HDR_DONE, HDR_ERROR, HDR_NEED_MORE } remoteip_parse_status_t;
+
+static void *create_remoteip_server_config(apr_pool_t *p, server_rec *s)
+{
+ remoteip_config_t *config = apr_pcalloc(p, sizeof(*config));
+ config->disabled_subnets = apr_array_make(p, 1, sizeof(apr_ipsubnet_t *));
+ /* config->header_name = NULL;
+ * config->proxies_header_name = NULL;
+ * config->proxy_protocol_enabled = NULL;
+ * config->proxy_protocol_disabled = NULL;
+ */
+ config->pool = p;
+ return config;
+}
+
+static void *merge_remoteip_server_config(apr_pool_t *p, void *globalv,
+ void *serverv)
+{
+ remoteip_config_t *global = (remoteip_config_t *) globalv;
+ remoteip_config_t *server = (remoteip_config_t *) serverv;
+ remoteip_config_t *config;
+
+ config = (remoteip_config_t *) apr_palloc(p, sizeof(*config));
+ config->header_name = server->header_name
+ ? server->header_name
+ : global->header_name;
+ config->proxies_header_name = server->proxies_header_name
+ ? server->proxies_header_name
+ : global->proxies_header_name;
+ config->proxymatch_ip = server->proxymatch_ip
+ ? server->proxymatch_ip
+ : global->proxymatch_ip;
+ return config;
+}
+
+static const char *header_name_set(cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ remoteip_config_t *config = ap_get_module_config(cmd->server->module_config,
+ &remoteip_module);
+ config->header_name = arg;
+ return NULL;
+}
+
+static const char *proxies_header_name_set(cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ remoteip_config_t *config = ap_get_module_config(cmd->server->module_config,
+ &remoteip_module);
+ config->proxies_header_name = arg;
+ return NULL;
+}
+
+/* Would be quite nice if APR exported this */
+/* apr:network_io/unix/sockaddr.c */
+static int looks_like_ip(const char *ipstr)
+{
+ if (ap_strchr_c(ipstr, ':')) {
+ /* definitely not a hostname; assume it is intended to be an IPv6 address */
+ return 1;
+ }
+
+ /* simple IPv4 address string check */
+ while ((*ipstr == '.') || apr_isdigit(*ipstr))
+ ipstr++;
+ return (*ipstr == '\0');
+}
+
+static const char *proxies_set(cmd_parms *cmd, void *cfg,
+ const char *arg)
+{
+ remoteip_config_t *config = ap_get_module_config(cmd->server->module_config,
+ &remoteip_module);
+ remoteip_proxymatch_t *match;
+ apr_status_t rv;
+ char *ip = apr_pstrdup(cmd->temp_pool, arg);
+ char *s = ap_strchr(ip, '/');
+ if (s) {
+ *s++ = '\0';
+ }
+
+ if (!config->proxymatch_ip) {
+ config->proxymatch_ip = apr_array_make(cmd->pool, 1, sizeof(*match));
+ }
+ match = (remoteip_proxymatch_t *) apr_array_push(config->proxymatch_ip);
+ match->internal = cmd->info;
+
+ if (looks_like_ip(ip)) {
+ /* Note s may be null, that's fine (explicit host) */
+ rv = apr_ipsubnet_create(&match->ip, ip, s, cmd->pool);
+ }
+ else
+ {
+ apr_sockaddr_t *temp_sa;
+
+ if (s) {
+ return apr_pstrcat(cmd->pool, "RemoteIP: Error parsing IP ", arg,
+ " the subnet /", s, " is invalid for ",
+ cmd->cmd->name, NULL);
+ }
+
+ rv = apr_sockaddr_info_get(&temp_sa, ip, APR_UNSPEC, 0,
+ APR_IPV4_ADDR_OK, cmd->temp_pool);
+ while (rv == APR_SUCCESS)
+ {
+ apr_sockaddr_ip_get(&ip, temp_sa);
+ rv = apr_ipsubnet_create(&match->ip, ip, NULL, cmd->pool);
+ if (!(temp_sa = temp_sa->next)) {
+ break;
+ }
+ match = (remoteip_proxymatch_t *)
+ apr_array_push(config->proxymatch_ip);
+ match->internal = cmd->info;
+ }
+ }
+
+ if (rv != APR_SUCCESS) {
+ return apr_psprintf(cmd->pool,
+ "RemoteIP: Error parsing IP %s (%pm error) for %s",
+ arg, &rv, cmd->cmd->name);
+ }
+
+ return NULL;
+}
+
+static const char *proxylist_read(cmd_parms *cmd, void *cfg,
+ const char *filename)
+{
+ char lbuf[MAX_STRING_LEN];
+ char *arg;
+ const char *args;
+ const char *errmsg;
+ ap_configfile_t *cfp;
+ apr_status_t rv;
+
+ filename = ap_server_root_relative(cmd->temp_pool, filename);
+ rv = ap_pcfg_openfile(&cfp, cmd->temp_pool, filename);
+ if (rv != APR_SUCCESS) {
+ return apr_psprintf(cmd->pool, "%s: Could not open file %s: %pm",
+ cmd->cmd->name, filename, &rv);
+ }
+
+ while (!(ap_cfg_getline(lbuf, MAX_STRING_LEN, cfp))) {
+ args = lbuf;
+ while (*(arg = ap_getword_conf(cmd->temp_pool, &args)) != '\0') {
+ if (*arg == '#') {
+ break;
+ }
+ errmsg = proxies_set(cmd, cfg, arg);
+ if (errmsg) {
+ ap_cfg_closefile(cfp);
+ errmsg = apr_psprintf(cmd->pool, "%s at line %d of %s",
+ errmsg, cfp->line_number, filename);
+ return errmsg;
+ }
+ }
+ }
+
+ ap_cfg_closefile(cfp);
+ return NULL;
+}
+
+/** Similar to apr_sockaddr_equal, except that it compares ports too. */
+static int remoteip_sockaddr_equal(apr_sockaddr_t *addr1, apr_sockaddr_t *addr2)
+{
+ return (addr1->port == addr2->port && apr_sockaddr_equal(addr1, addr2));
+}
+
+#if !APR_VERSION_AT_LEAST(1,5,0)
+#define apr_sockaddr_is_wildcard sockaddr_is_wildcard
+/* XXX: temp build fix from apr 1.5.x */
+static int sockaddr_is_wildcard(const apr_sockaddr_t *addr)
+{
+ static const char inaddr_any[
+#if APR_HAVE_IPV6
+ sizeof(struct in6_addr)
+#else
+ sizeof(struct in_addr)
+#endif
+ ] = {0};
+
+ if (addr->ipaddr_ptr /* IP address initialized */
+ && addr->ipaddr_len <= sizeof inaddr_any) { /* else bug elsewhere? */
+ if (!memcmp(inaddr_any, addr->ipaddr_ptr, addr->ipaddr_len)) {
+ return 1;
+ }
+#if APR_HAVE_IPV6
+ if (addr->family == AF_INET6
+ && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)addr->ipaddr_ptr)) {
+ struct in_addr *v4 = (struct in_addr *)&((apr_uint32_t *)addr->ipaddr_ptr)[3];
+
+ if (!memcmp(inaddr_any, v4, sizeof *v4)) {
+ return 1;
+ }
+ }
+#endif
+ }
+ return 0;
+}
+#endif
+
+
+/** Similar to remoteip_sockaddr_equal, except that it handles wildcard addresses
+ * and ports too.
+ */
+static int remoteip_sockaddr_compat(apr_sockaddr_t *addr1, apr_sockaddr_t *addr2)
+{
+ /* test exact address equality */
+ if (apr_sockaddr_equal(addr1, addr2) &&
+ (addr1->port == addr2->port || addr1->port == 0 || addr2->port == 0)) {
+ return 1;
+ }
+
+ /* test address wildcards */
+ if (apr_sockaddr_is_wildcard(addr1) &&
+ (addr1->port == 0 || addr1->port == addr2->port)) {
+ return 1;
+ }
+
+ if (apr_sockaddr_is_wildcard(addr2) &&
+ (addr2->port == 0 || addr2->port == addr1->port)) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int remoteip_addr_in_list(remoteip_addr_info *list, apr_sockaddr_t *addr)
+{
+ for (; list; list = list->next) {
+ if (remoteip_sockaddr_compat(list->addr, addr)) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static void remoteip_warn_enable_conflict(remoteip_addr_info *prev, server_rec *new, int flag)
+{
+ char buf[INET6_ADDRSTRLEN];
+
+ apr_sockaddr_ip_getbuf(buf, sizeof(buf), prev->addr);
+
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, new, APLOGNO(03491)
+ "RemoteIPProxyProtocol: previous setting for %s:%hu from virtual "
+ "host {%s:%hu in %s} is being overridden by virtual host "
+ "{%s:%hu in %s}; new setting is '%s'",
+ buf, prev->addr->port, prev->source->server_hostname,
+ prev->source->addrs->host_port, prev->source->defn_name,
+ new->server_hostname, new->addrs->host_port, new->defn_name,
+ flag ? "On" : "Off");
+}
+
+static const char *remoteip_enable_proxy_protocol(cmd_parms *cmd, void *config,
+ int flag)
+{
+ remoteip_config_t *conf;
+ server_addr_rec *addr;
+ remoteip_addr_info **add;
+ remoteip_addr_info **rem;
+ remoteip_addr_info *list;
+
+ conf = ap_get_module_config(ap_server_conf->module_config,
+ &remoteip_module);
+
+ if (flag) {
+ add = &conf->proxy_protocol_enabled;
+ rem = &conf->proxy_protocol_disabled;
+ }
+ else {
+ add = &conf->proxy_protocol_disabled;
+ rem = &conf->proxy_protocol_enabled;
+ }
+
+ for (addr = cmd->server->addrs; addr; addr = addr->next) {
+ /* remove address from opposite list */
+ if (*rem) {
+ if (remoteip_sockaddr_equal((*rem)->addr, addr->host_addr)) {
+ remoteip_warn_enable_conflict(*rem, cmd->server, flag);
+ *rem = (*rem)->next;
+ }
+ else {
+ for (list = *rem; list->next; list = list->next) {
+ if (remoteip_sockaddr_equal(list->next->addr, addr->host_addr)) {
+ remoteip_warn_enable_conflict(list->next, cmd->server, flag);
+ list->next = list->next->next;
+ break;
+ }
+ }
+ }
+ }
+
+ /* add address to desired list */
+ if (!remoteip_addr_in_list(*add, addr->host_addr)) {
+ remoteip_addr_info *info = apr_palloc(conf->pool, sizeof(*info));
+ info->addr = addr->host_addr;
+ info->source = cmd->server;
+ info->next = *add;
+ *add = info;
+ }
+ }
+
+ return NULL;
+}
+
+static const char *remoteip_disable_networks(cmd_parms *cmd, void *d,
+ int argc, char *const argv[])
+{
+ int i;
+ apr_pool_t *ptemp = cmd->temp_pool;
+ apr_pool_t *p = cmd->pool;
+ remoteip_config_t *conf = ap_get_module_config(ap_server_conf->module_config,
+ &remoteip_module);
+
+ if (argc == 0)
+ return apr_pstrcat(p, cmd->cmd->name, " requires an argument", NULL);
+
+
+ for (i=0; i<argc; i++) {
+ char *addr = apr_pstrdup(ptemp, argv[i]);
+ char *mask;
+ apr_status_t rv;
+ apr_ipsubnet_t **ip = apr_pcalloc(p, sizeof(apr_ipsubnet_t *));
+
+ if ((mask = ap_strchr(addr, '/')))
+ *mask++ = '\0';
+
+ rv = apr_ipsubnet_create(ip, addr, mask, p);
+
+ if (APR_STATUS_IS_EINVAL(rv)) {
+ /* looked nothing like an IP address */
+ return apr_psprintf(p, "ip address '%s' appears to be invalid", addr);
+ }
+ else if (rv != APR_SUCCESS) {
+ return apr_psprintf(p, "ip address '%s' appears to be invalid: %pm",
+ addr, &rv);
+ }
+
+ *(apr_ipsubnet_t**)apr_array_push(conf->disabled_subnets) = *ip;
+ }
+
+ return NULL;
+}
+
+static int remoteip_hook_post_config(apr_pool_t *pconf, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ remoteip_config_t *conf;
+ remoteip_addr_info *info;
+ char buf[INET6_ADDRSTRLEN];
+
+ conf = ap_get_module_config(ap_server_conf->module_config,
+ &remoteip_module);
+
+ for (info = conf->proxy_protocol_enabled; info; info = info->next) {
+ apr_sockaddr_ip_getbuf(buf, sizeof(buf), info->addr);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(03492)
+ "RemoteIPProxyProtocol: enabled on %s:%hu", buf, info->addr->port);
+ }
+ for (info = conf->proxy_protocol_disabled; info; info = info->next) {
+ apr_sockaddr_ip_getbuf(buf, sizeof(buf), info->addr);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(03494)
+ "RemoteIPProxyProtocol: disabled on %s:%hu", buf, info->addr->port);
+ }
+
+ return OK;
+}
+
+static int remoteip_modify_request(request_rec *r)
+{
+ conn_rec *c = r->connection;
+ remoteip_config_t *config = (remoteip_config_t *)
+ ap_get_module_config(r->server->module_config, &remoteip_module);
+ remoteip_conn_config_t *conn_config = (remoteip_conn_config_t *)
+ ap_get_module_config(r->connection->conn_config, &remoteip_module);
+
+ remoteip_req_t *req = NULL;
+ apr_sockaddr_t *temp_sa;
+
+ apr_status_t rv;
+ char *remote;
+ char *proxy_ips = NULL;
+ char *parse_remote;
+ char *eos;
+ unsigned char *addrbyte;
+
+ /* If no RemoteIPInternalProxy, RemoteIPInternalProxyList, RemoteIPTrustedProxy
+ or RemoteIPTrustedProxyList directive is configured,
+ all proxies will be considered as external trusted proxies.
+ */
+ void *internal = NULL;
+
+ /* No header defined or results from our input filter */
+ if (!config->header_name && !conn_config) {
+ return DECLINED;
+ }
+
+ /* Easy parsing case - just position the data we already have from PROXY
+ protocol handling allowing it to take precedence and return
+ */
+ if (conn_config) {
+ if (!conn_config->client_addr) {
+ ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(03496)
+ "RemoteIPProxyProtocol data is missing, but required! Aborting request.");
+ return HTTP_BAD_REQUEST;
+ }
+
+ r->useragent_addr = conn_config->client_addr;
+ r->useragent_ip = conn_config->client_ip;
+
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+ "Using %s as client's IP from PROXY protocol", r->useragent_ip);
+ return OK;
+ }
+
+ if (config->proxymatch_ip) {
+ /* This indicates that a RemoteIPInternalProxy, RemoteIPInternalProxyList, RemoteIPTrustedProxy
+ or RemoteIPTrustedProxyList directive is configured.
+ In this case, default to internal proxy.
+ */
+ internal = (void *) 1;
+ }
+
+ remote = (char *) apr_table_get(r->headers_in, config->header_name);
+ if (!remote) {
+ return OK;
+ }
+ remote = apr_pstrdup(r->pool, remote);
+
+ temp_sa = r->useragent_addr ? r->useragent_addr : c->client_addr;
+
+ while (remote) {
+
+ /* verify user agent IP against the trusted proxy list
+ */
+ if (config->proxymatch_ip) {
+ int i;
+ remoteip_proxymatch_t *match;
+ match = (remoteip_proxymatch_t *)config->proxymatch_ip->elts;
+ for (i = 0; i < config->proxymatch_ip->nelts; ++i) {
+ if (apr_ipsubnet_test(match[i].ip, temp_sa)) {
+ if (internal) {
+ /* Allow an internal proxy to present an external proxy,
+ but do not allow an external proxy to present an internal proxy.
+ In this case, the presented internal proxy will be considered external.
+ */
+ internal = match[i].internal;
+ }
+ break;
+ }
+ }
+ if (i && i >= config->proxymatch_ip->nelts) {
+ break;
+ }
+ }
+
+ if ((parse_remote = strrchr(remote, ',')) == NULL) {
+ parse_remote = remote;
+ remote = NULL;
+ }
+ else {
+ *(parse_remote++) = '\0';
+ }
+
+ while (*parse_remote == ' ') {
+ ++parse_remote;
+ }
+
+ eos = parse_remote + strlen(parse_remote) - 1;
+ while (eos >= parse_remote && *eos == ' ') {
+ *(eos--) = '\0';
+ }
+
+ if (eos < parse_remote) {
+ if (remote) {
+ *(remote + strlen(remote)) = ',';
+ }
+ else {
+ remote = parse_remote;
+ }
+ break;
+ }
+
+ /* We map as IPv4 rather than IPv6 for equivalent host names
+ * or IPV4OVERIPV6
+ */
+ rv = apr_sockaddr_info_get(&temp_sa, parse_remote,
+ APR_UNSPEC, temp_sa->port,
+ APR_IPV4_ADDR_OK, r->pool);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(01568)
+ "RemoteIP: Header %s value of %s cannot be parsed "
+ "as a client IP",
+ config->header_name, parse_remote);
+
+ if (remote) {
+ *(remote + strlen(remote)) = ',';
+ }
+ else {
+ remote = parse_remote;
+ }
+ break;
+ }
+
+ addrbyte = (unsigned char *) &temp_sa->sa.sin.sin_addr;
+
+ /* For intranet (Internal proxies) ignore all restrictions below */
+ if (!internal
+ && ((temp_sa->family == APR_INET
+ /* For internet (non-Internal proxies) deny all
+ * RFC3330 designated local/private subnets:
+ * 10.0.0.0/8 169.254.0.0/16 192.168.0.0/16
+ * 127.0.0.0/8 172.16.0.0/12
+ */
+ && (addrbyte[0] == 10
+ || addrbyte[0] == 127
+ || (addrbyte[0] == 169 && addrbyte[1] == 254)
+ || (addrbyte[0] == 172 && (addrbyte[1] & 0xf0) == 16)
+ || (addrbyte[0] == 192 && addrbyte[1] == 168)))
+#if APR_HAVE_IPV6
+ || (temp_sa->family == APR_INET6
+ /* For internet (non-Internal proxies) we translated
+ * IPv4-over-IPv6-mapped addresses as IPv4, above.
+ * Accept only Global Unicast 2000::/3 defined by RFC4291
+ */
+ && ((temp_sa->sa.sin6.sin6_addr.s6_addr[0] & 0xe0) != 0x20))
+#endif
+ )) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(01569)
+ "RemoteIP: Header %s value of %s appears to be "
+ "a private IP or nonsensical. Ignored",
+ config->header_name, parse_remote);
+ if (remote) {
+ *(remote + strlen(remote)) = ',';
+ }
+ else {
+ remote = parse_remote;
+ }
+
+ break;
+ }
+
+ /* save away our results */
+ if (!req) {
+ req = (remoteip_req_t *) apr_palloc(r->pool, sizeof(remoteip_req_t));
+ req->useragent_ip = r->useragent_ip;
+ }
+
+ /* Set useragent_ip string */
+ if (!internal) {
+ if (proxy_ips) {
+ proxy_ips = apr_pstrcat(r->pool, proxy_ips, ", ",
+ req->useragent_ip, NULL);
+ }
+ else {
+ proxy_ips = req->useragent_ip;
+ }
+ }
+
+ req->useragent_addr = temp_sa;
+ apr_sockaddr_ip_get(&req->useragent_ip, req->useragent_addr);
+ }
+
+ /* Nothing happened? */
+ if (!req) {
+ return OK;
+ }
+
+ /* Port is not known so set it to zero; otherwise it can be misleading */
+ req->useragent_addr->port = 0;
+
+ req->proxied_remote = remote;
+ req->proxy_ips = proxy_ips;
+
+ if (req->proxied_remote) {
+ apr_table_setn(r->headers_in, config->header_name,
+ req->proxied_remote);
+ }
+ else {
+ apr_table_unset(r->headers_in, config->header_name);
+ }
+ if (req->proxy_ips) {
+ apr_table_setn(r->notes, "remoteip-proxy-ip-list", req->proxy_ips);
+ if (config->proxies_header_name) {
+ apr_table_setn(r->headers_in, config->proxies_header_name,
+ req->proxy_ips);
+ }
+ }
+
+ r->useragent_addr = req->useragent_addr;
+ r->useragent_ip = req->useragent_ip;
+
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+ req->proxy_ips
+ ? "Using %s as client's IP by proxies %s"
+ : "Using %s as client's IP by internal proxies%s",
+ req->useragent_ip,
+ (req->proxy_ips ? req->proxy_ips : ""));
+ return OK;
+}
+
+static int remoteip_is_server_port(apr_port_t port)
+{
+ ap_listen_rec *lr;
+
+ for (lr = ap_listeners; lr; lr = lr->next) {
+ if (lr->bind_addr && lr->bind_addr->port == port) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Human readable format:
+ * PROXY {TCP4|TCP6|UNKNOWN} <client-ip-addr> <dest-ip-addr> <client-port> <dest-port><CR><LF>
+ */
+static remoteip_parse_status_t remoteip_process_v1_header(conn_rec *c,
+ remoteip_conn_config_t *conn_conf,
+ proxy_header *hdr, apr_size_t len,
+ apr_size_t *hdr_len)
+{
+ char *end, *word, *host, *valid_addr_chars, *saveptr;
+ char buf[sizeof(hdr->v1.line)];
+ apr_port_t port;
+ apr_status_t ret;
+ apr_int32_t family;
+
+#define GET_NEXT_WORD(field) \
+ word = apr_strtok(NULL, " ", &saveptr); \
+ if (!word) { \
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03497) \
+ "RemoteIPProxyProtocol: no " field " found in header '%s'", \
+ hdr->v1.line); \
+ return HDR_ERROR; \
+ }
+
+ end = memchr(hdr->v1.line, '\r', len - 1);
+ if (!end || end[1] != '\n') {
+ return HDR_NEED_MORE; /* partial or invalid header */
+ }
+
+ *end = '\0';
+ *hdr_len = end + 2 - hdr->v1.line; /* skip header + CRLF */
+
+ /* parse in separate buffer so have the original for error messages */
+ strcpy(buf, hdr->v1.line);
+
+ apr_strtok(buf, " ", &saveptr);
+
+ /* parse family */
+ GET_NEXT_WORD("family")
+ if (strcmp(word, "UNKNOWN") == 0) {
+ conn_conf->client_addr = c->client_addr;
+ conn_conf->client_ip = c->client_ip;
+ return HDR_DONE;
+ }
+ else if (strcmp(word, "TCP4") == 0) {
+ family = APR_INET;
+ valid_addr_chars = "0123456789.";
+ }
+ else if (strcmp(word, "TCP6") == 0) {
+#if APR_HAVE_IPV6
+ family = APR_INET6;
+ valid_addr_chars = "0123456789abcdefABCDEF:";
+#else
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03498)
+ "RemoteIPProxyProtocol: Unable to parse v6 address - APR is not compiled with IPv6 support");
+ return HDR_ERROR;
+#endif
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03499)
+ "RemoteIPProxyProtocol: unknown family '%s' in header '%s'",
+ word, hdr->v1.line);
+ return HDR_ERROR;
+ }
+
+ /* parse client-addr */
+ GET_NEXT_WORD("client-address")
+
+ if (strspn(word, valid_addr_chars) != strlen(word)) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03500)
+ "RemoteIPProxyProtocol: invalid client-address '%s' found in "
+ "header '%s'", word, hdr->v1.line);
+ return HDR_ERROR;
+ }
+
+ host = word;
+
+ /* parse dest-addr */
+ GET_NEXT_WORD("destination-address")
+
+ /* parse client-port */
+ GET_NEXT_WORD("client-port")
+ if (sscanf(word, "%hu", &port) != 1) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03501)
+ "RemoteIPProxyProtocol: error parsing port '%s' in header '%s'",
+ word, hdr->v1.line);
+ return HDR_ERROR;
+ }
+
+ /* parse dest-port */
+ /* GET_NEXT_WORD("destination-port") - no-op since we don't care about it */
+
+ /* create a socketaddr from the info */
+ ret = apr_sockaddr_info_get(&conn_conf->client_addr, host, family, port, 0,
+ c->pool);
+ if (ret != APR_SUCCESS) {
+ conn_conf->client_addr = NULL;
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, c, APLOGNO(03502)
+ "RemoteIPProxyProtocol: error converting family '%d', host '%s',"
+ " and port '%hu' to sockaddr; header was '%s'",
+ family, host, port, hdr->v1.line);
+ return HDR_ERROR;
+ }
+
+ conn_conf->client_ip = apr_pstrdup(c->pool, host);
+
+ return HDR_DONE;
+}
+
+/** Add our filter to the connection if it is requested
+ */
+static int remoteip_hook_pre_connection(conn_rec *c, void *csd)
+{
+ remoteip_config_t *conf;
+ remoteip_conn_config_t *conn_conf;
+ int i;
+
+ /* Establish master config in slave connections, so that request processing
+ * finds it. */
+ if (c->master != NULL) {
+ conn_conf = ap_get_module_config(c->master->conn_config, &remoteip_module);
+ if (conn_conf) {
+ ap_set_module_config(c->conn_config, &remoteip_module, conn_conf);
+ }
+ return DECLINED;
+ }
+
+ conf = ap_get_module_config(ap_server_conf->module_config,
+ &remoteip_module);
+
+ /* check if we're enabled for this connection */
+ if (!remoteip_addr_in_list(conf->proxy_protocol_enabled, c->local_addr)
+ || remoteip_addr_in_list(conf->proxy_protocol_disabled, c->local_addr)) {
+
+ return DECLINED;
+ }
+
+ /* We are enabled for this IP/port, but check that we aren't
+ explicitly disabled */
+ for (i = 0; i < conf->disabled_subnets->nelts; i++) {
+ apr_ipsubnet_t *ip = ((apr_ipsubnet_t**)conf->disabled_subnets->elts)[i];
+
+ if (ip && apr_ipsubnet_test(ip, c->client_addr))
+ return DECLINED;
+ }
+
+ /* mod_proxy creates outgoing connections - we don't want those */
+ if (!remoteip_is_server_port(c->local_addr->port)) {
+ return DECLINED;
+ }
+
+ /* add our filter */
+ if (!ap_add_input_filter_handle(remoteip_filter, NULL, NULL, c)) {
+ /* XXX: Shouldn't this WARN in log? */
+ return DECLINED;
+ }
+
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03503)
+ "RemoteIPProxyProtocol: enabled on connection to %s:%hu",
+ c->local_ip, c->local_addr->port);
+
+ /* this holds the resolved proxy info for this connection */
+ conn_conf = apr_pcalloc(c->pool, sizeof(*conn_conf));
+
+ ap_set_module_config(c->conn_config, &remoteip_module, conn_conf);
+
+ return OK;
+}
+
+/* Binary format:
+ * <sig><cmd><proto><addr-len><addr>
+ * sig = \x0D \x0A \x0D \x0A \x00 \x0D \x0A \x51 \x55 \x49 \x54 \x0A
+ * cmd = <4-bits-version><4-bits-command>
+ * 4-bits-version = \x02
+ * 4-bits-command = {\x00|\x01} (\x00 = LOCAL: discard con info; \x01 = PROXY)
+ * proto = <4-bits-family><4-bits-protocol>
+ * 4-bits-family = {\x00|\x01|\x02|\x03} (AF_UNSPEC, AF_INET, AF_INET6, AF_UNIX)
+ * 4-bits-protocol = {\x00|\x01|\x02} (UNSPEC, STREAM, DGRAM)
+ */
+static remoteip_parse_status_t remoteip_process_v2_header(conn_rec *c,
+ remoteip_conn_config_t *conn_conf,
+ proxy_header *hdr)
+{
+ apr_status_t ret;
+
+ switch (hdr->v2.ver_cmd & 0xF) {
+ case 0x01: /* PROXY command */
+ switch (hdr->v2.fam) {
+ case 0x11: /* TCPv4 */
+ ret = apr_sockaddr_info_get(&conn_conf->client_addr, NULL,
+ APR_INET,
+ ntohs(hdr->v2.addr.ip4.src_port),
+ 0, c->pool);
+ if (ret != APR_SUCCESS) {
+ conn_conf->client_addr = NULL;
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, c, APLOGNO(03504)
+ "RemoteIPPProxyProtocol: error creating sockaddr");
+ return HDR_ERROR;
+ }
+
+ conn_conf->client_addr->sa.sin.sin_addr.s_addr =
+ hdr->v2.addr.ip4.src_addr;
+ break;
+
+ case 0x21: /* TCPv6 */
+#if APR_HAVE_IPV6
+ ret = apr_sockaddr_info_get(&conn_conf->client_addr, NULL,
+ APR_INET6,
+ ntohs(hdr->v2.addr.ip6.src_port),
+ 0, c->pool);
+ if (ret != APR_SUCCESS) {
+ conn_conf->client_addr = NULL;
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, c, APLOGNO(03505)
+ "RemoteIPProxyProtocol: error creating sockaddr");
+ return HDR_ERROR;
+ }
+ memcpy(&conn_conf->client_addr->sa.sin6.sin6_addr.s6_addr,
+ hdr->v2.addr.ip6.src_addr, 16);
+ break;
+#else
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03506)
+ "RemoteIPProxyProtocol: APR is not compiled with IPv6 support");
+ return HDR_ERROR;
+#endif
+ default:
+ /* unsupported protocol */
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(10183)
+ "RemoteIPProxyProtocol: unsupported protocol %.2hx",
+ (unsigned short)hdr->v2.fam);
+ return HDR_ERROR;
+ }
+ break; /* we got a sockaddr now */
+ default:
+ /* not a supported command */
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03507)
+ "RemoteIPProxyProtocol: unsupported command %.2hx",
+ (unsigned short)hdr->v2.ver_cmd);
+ return HDR_ERROR;
+ }
+
+ /* got address - compute the client_ip from it */
+ ret = apr_sockaddr_ip_get(&conn_conf->client_ip, conn_conf->client_addr);
+ if (ret != APR_SUCCESS) {
+ conn_conf->client_addr = NULL;
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, c, APLOGNO(03508)
+ "RemoteIPProxyProtocol: error converting address to string");
+ return HDR_ERROR;
+ }
+
+ return HDR_DONE;
+}
+
+/** Return length for a v2 protocol header. */
+static apr_size_t remoteip_get_v2_len(proxy_header *hdr)
+{
+ return ntohs(hdr->v2.len);
+}
+
+/** Determine if this is a v1 or v2 PROXY header.
+ */
+static int remoteip_determine_version(conn_rec *c, const char *ptr)
+{
+ proxy_header *hdr = (proxy_header *) ptr;
+
+ /* assert len >= 14 */
+
+ if (memcmp(&hdr->v2, v2sig, sizeof(v2sig)) == 0 &&
+ (hdr->v2.ver_cmd & 0xF0) == 0x20) {
+ return 2;
+ }
+ else if (memcmp(hdr->v1.line, "PROXY ", 6) == 0) {
+ return 1;
+ }
+ else {
+ return -1;
+ }
+}
+
+/* Capture the first bytes on the protocol and parse the PROXY protocol header.
+ * Removes itself when the header is complete.
+ */
+static apr_status_t remoteip_input_filter(ap_filter_t *f,
+ apr_bucket_brigade *bb_out,
+ ap_input_mode_t mode,
+ apr_read_type_e block,
+ apr_off_t readbytes)
+{
+ apr_status_t ret;
+ remoteip_filter_context *ctx = f->ctx;
+ remoteip_conn_config_t *conn_conf;
+ apr_bucket *b;
+ remoteip_parse_status_t psts = HDR_NEED_MORE;
+ const char *ptr;
+ apr_size_t len;
+
+ if (f->c->aborted) {
+ return APR_ECONNABORTED;
+ }
+
+ /* allocate/retrieve the context that holds our header */
+ if (!ctx) {
+ ctx = f->ctx = apr_palloc(f->c->pool, sizeof(*ctx));
+ ctx->rcvd = 0;
+ ctx->need = MIN_HDR_LEN;
+ ctx->version = 0;
+ ctx->mode = AP_MODE_READBYTES;
+ ctx->bb = apr_brigade_create(f->c->pool, f->c->bucket_alloc);
+ ctx->done = 0;
+ }
+
+ if (ctx->done) {
+ /* Note: because we're a connection filter we can't remove ourselves
+ * when we're done, so we have to stay in the chain and just go into
+ * passthrough mode.
+ */
+ return ap_get_brigade(f->next, bb_out, mode, block, readbytes);
+ }
+
+ conn_conf = ap_get_module_config(f->c->conn_config, &remoteip_module);
+
+ /* try to read a header's worth of data */
+ while (!ctx->done) {
+ if (APR_BRIGADE_EMPTY(ctx->bb)) {
+ apr_off_t got, want = ctx->need - ctx->rcvd;
+
+ ret = ap_get_brigade(f->next, ctx->bb, ctx->mode, block, want);
+ if (ret != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, f->c, APLOGNO(10184)
+ "failed reading input");
+ return ret;
+ }
+
+ ret = apr_brigade_length(ctx->bb, 1, &got);
+ if (ret || got > want) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, f->c, APLOGNO(10185)
+ "RemoteIPProxyProtocol header too long, "
+ "got %" APR_OFF_T_FMT " expected %" APR_OFF_T_FMT,
+ got, want);
+ f->c->aborted = 1;
+ return APR_ECONNABORTED;
+ }
+ }
+ if (APR_BRIGADE_EMPTY(ctx->bb)) {
+ return block == APR_NONBLOCK_READ ? APR_SUCCESS : APR_EOF;
+ }
+
+ while (!ctx->done && !APR_BRIGADE_EMPTY(ctx->bb)) {
+ b = APR_BRIGADE_FIRST(ctx->bb);
+
+ ret = apr_bucket_read(b, &ptr, &len, block);
+ if (APR_STATUS_IS_EAGAIN(ret) && block == APR_NONBLOCK_READ) {
+ return APR_SUCCESS;
+ }
+ if (ret != APR_SUCCESS) {
+ return ret;
+ }
+
+ memcpy(ctx->header + ctx->rcvd, ptr, len);
+ ctx->rcvd += len;
+
+ apr_bucket_delete(b);
+ psts = HDR_NEED_MORE;
+
+ if (ctx->version == 0) {
+ /* reading initial chunk */
+ if (ctx->rcvd >= MIN_HDR_LEN) {
+ ctx->version = remoteip_determine_version(f->c, ctx->header);
+ if (ctx->version < 0) {
+ psts = HDR_ERROR;
+ }
+ else if (ctx->version == 1) {
+ ctx->mode = AP_MODE_GETLINE;
+ ctx->need = sizeof(proxy_v1);
+ }
+ else if (ctx->version == 2) {
+ ctx->need = MIN_V2_HDR_LEN;
+ }
+ }
+ }
+ else if (ctx->version == 1) {
+ psts = remoteip_process_v1_header(f->c, conn_conf,
+ (proxy_header *) ctx->header,
+ ctx->rcvd, &ctx->need);
+ }
+ else if (ctx->version == 2) {
+ if (ctx->rcvd >= MIN_V2_HDR_LEN) {
+ ctx->need = MIN_V2_HDR_LEN +
+ remoteip_get_v2_len((proxy_header *) ctx->header);
+ if (ctx->need > sizeof(proxy_v2)) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(10186)
+ "RemoteIPProxyProtocol protocol header length too long");
+ f->c->aborted = 1;
+ apr_brigade_destroy(ctx->bb);
+ return APR_ECONNABORTED;
+ }
+ }
+ if (ctx->rcvd >= ctx->need) {
+ psts = remoteip_process_v2_header(f->c, conn_conf,
+ (proxy_header *) ctx->header);
+ }
+ }
+ else {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(03509)
+ "RemoteIPProxyProtocol: internal error: unknown version "
+ "%d", ctx->version);
+ f->c->aborted = 1;
+ apr_brigade_destroy(ctx->bb);
+ return APR_ECONNABORTED;
+ }
+
+ switch (psts) {
+ case HDR_ERROR:
+ f->c->aborted = 1;
+ apr_brigade_destroy(ctx->bb);
+ return APR_ECONNABORTED;
+
+ case HDR_DONE:
+ ctx->done = 1;
+ break;
+
+ case HDR_NEED_MORE:
+ break;
+ }
+ }
+ }
+
+ /* we only get here when done == 1 */
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, f->c, APLOGNO(03511)
+ "RemoteIPProxyProtocol: received valid PROXY header: %s:%hu",
+ conn_conf->client_ip, conn_conf->client_addr->port);
+
+ if (ctx->rcvd > ctx->need || !APR_BRIGADE_EMPTY(ctx->bb)) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(03513)
+ "RemoteIPProxyProtocol: internal error: have data left over; "
+ " need=%" APR_SIZE_T_FMT ", rcvd=%" APR_SIZE_T_FMT
+ ", brigade-empty=%d", ctx->need, ctx->rcvd,
+ APR_BRIGADE_EMPTY(ctx->bb));
+ f->c->aborted = 1;
+ apr_brigade_destroy(ctx->bb);
+ return APR_ECONNABORTED;
+ }
+
+ /* clean up */
+ apr_brigade_destroy(ctx->bb);
+ ctx->bb = NULL;
+
+ /* now do the real read for the upper layer */
+ return ap_get_brigade(f->next, bb_out, mode, block, readbytes);
+}
+
+static const command_rec remoteip_cmds[] =
+{
+ AP_INIT_TAKE1("RemoteIPHeader", header_name_set, NULL, RSRC_CONF,
+ "Specifies a request header to trust as the client IP, "
+ "e.g. X-Forwarded-For"),
+ AP_INIT_TAKE1("RemoteIPProxiesHeader", proxies_header_name_set,
+ NULL, RSRC_CONF,
+ "Specifies a request header to record proxy IP's, "
+ "e.g. X-Forwarded-By; if not given then do not record"),
+ AP_INIT_ITERATE("RemoteIPTrustedProxy", proxies_set, 0, RSRC_CONF,
+ "Specifies one or more proxies which are trusted "
+ "to present IP headers"),
+ AP_INIT_ITERATE("RemoteIPInternalProxy", proxies_set, (void*)1, RSRC_CONF,
+ "Specifies one or more internal (transparent) proxies "
+ "which are trusted to present IP headers"),
+ AP_INIT_TAKE1("RemoteIPTrustedProxyList", proxylist_read, 0,
+ RSRC_CONF | EXEC_ON_READ,
+ "The filename to read the list of trusted proxies, "
+ "see the RemoteIPTrustedProxy directive"),
+ AP_INIT_TAKE1("RemoteIPInternalProxyList", proxylist_read, (void*)1,
+ RSRC_CONF | EXEC_ON_READ,
+ "The filename to read the list of internal proxies, "
+ "see the RemoteIPInternalProxy directive"),
+ AP_INIT_FLAG("RemoteIPProxyProtocol", remoteip_enable_proxy_protocol, NULL,
+ RSRC_CONF, "Enable PROXY protocol handling ('on', 'off')"),
+ AP_INIT_TAKE_ARGV("RemoteIPProxyProtocolExceptions",
+ remoteip_disable_networks, NULL, RSRC_CONF, "Disable PROXY "
+ "protocol handling for this list of networks in CIDR format"),
+ { NULL }
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+ /* mod_ssl is CONNECTION + 5, so we want something higher (earlier);
+ * mod_reqtimeout is CONNECTION + 8, so we want something lower (later) */
+ remoteip_filter =
+ ap_register_input_filter("REMOTEIP_INPUT", remoteip_input_filter, NULL,
+ AP_FTYPE_CONNECTION + 7);
+
+ ap_hook_post_config(remoteip_hook_post_config, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_pre_connection(remoteip_hook_pre_connection, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_post_read_request(remoteip_modify_request, NULL, NULL, APR_HOOK_FIRST);
+}
+
+AP_DECLARE_MODULE(remoteip) = {
+ STANDARD20_MODULE_STUFF,
+ NULL, /* create per-directory config structure */
+ NULL, /* merge per-directory config structures */
+ create_remoteip_server_config, /* create per-server config structure */
+ merge_remoteip_server_config, /* merge per-server config structures */
+ remoteip_cmds, /* command apr_table_t */
+ register_hooks /* register hooks */
+};