1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
# ./pullrev.sh 1366693
http://svn.apache.org/viewvc?view=revision&revision=1366693
--- httpd-2.4.2/modules/proxy/mod_proxy_connect.c
+++ httpd-2.4.2/modules/proxy/mod_proxy_connect.c
@@ -205,7 +205,7 @@
conn_rec *backconn;
apr_bucket_brigade *bb = apr_brigade_create(p, c->bucket_alloc);
- apr_status_t err, rv;
+ apr_status_t rv;
apr_size_t nbytes;
char buffer[HUGE_STRING_LEN];
apr_socket_t *client_socket = ap_get_conn_socket(c);
@@ -216,7 +216,7 @@
const apr_pollfd_t *signalled;
apr_int32_t pollcnt, pi;
apr_int16_t pollevent;
- apr_sockaddr_t *uri_addr, *connect_addr;
+ apr_sockaddr_t *nexthop;
apr_uri_t uri;
const char *connectname;
@@ -246,37 +246,32 @@
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01019)
"connecting %s to %s:%d", url, uri.hostname, uri.port);
- /* do a DNS lookup for the destination host */
- err = apr_sockaddr_info_get(&uri_addr, uri.hostname, APR_UNSPEC, uri.port,
- 0, p);
- if (APR_SUCCESS != err) {
+ /* Determine host/port of next hop; from request URI or of a proxy. */
+ connectname = proxyname ? proxyname : uri.hostname;
+ connectport = proxyname ? proxyport : uri.port;
+
+ /* Do a DNS lookup for the next hop */
+ rv = apr_sockaddr_info_get(&nexthop, connectname, APR_UNSPEC,
+ connectport, 0, p);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO()
+ "failed to resolve hostname '%s'", connectname);
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "DNS lookup failure for: ",
- uri.hostname, NULL));
+ connectname, NULL));
}
- /* are we connecting directly, or via a proxy? */
- if (proxyname) {
- connectname = proxyname;
- connectport = proxyport;
- err = apr_sockaddr_info_get(&connect_addr, proxyname, APR_UNSPEC,
- proxyport, 0, p);
+ /* Check ProxyBlock directive on the hostname/address. */
+ if (ap_proxy_checkproxyblock2(r, conf, uri.hostname,
+ proxyname ? NULL : nexthop) != OK) {
+ return ap_proxyerror(r, HTTP_FORBIDDEN,
+ "Connect to remote machine blocked");
}
- else {
- connectname = uri.hostname;
- connectport = uri.port;
- connect_addr = uri_addr;
- }
+
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
"connecting to remote proxy %s on port %d",
connectname, connectport);
- /* check if ProxyBlock directive on this host */
- if (OK != ap_proxy_checkproxyblock(r, conf, uri_addr)) {
- return ap_proxyerror(r, HTTP_FORBIDDEN,
- "Connect to remote machine blocked");
- }
-
/* Check if it is an allowed port */
if(!allowed_port(c_conf, uri.port)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
@@ -289,15 +284,6 @@
* We have determined who to connect to. Now make the connection.
*/
- /* get all the possible IP addresses for the destname and loop through them
- * until we get a successful connection
- */
- if (APR_SUCCESS != err) {
- return ap_proxyerror(r, HTTP_BAD_GATEWAY,
- apr_pstrcat(p, "DNS lookup failure for: ",
- connectname, NULL));
- }
-
/*
* At this point we have a list of one or more IP addresses of
* the machine to connect to. If configured, reorder this
@@ -308,7 +294,7 @@
* For now we do nothing, ie we get DNS round robin.
* XXX FIXME
*/
- failed = ap_proxy_connect_to_backend(&sock, "CONNECT", connect_addr,
+ failed = ap_proxy_connect_to_backend(&sock, "CONNECT", nexthop,
connectname, conf, r);
/* handle a permanent error from the above loop */
@@ -355,7 +341,7 @@
/* peer reset */
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01021)
"an error occurred creating a new connection "
- "to %pI (%s)", connect_addr, connectname);
+ "to %pI (%s)", nexthop, connectname);
apr_socket_close(sock);
return HTTP_INTERNAL_SERVER_ERROR;
}
@@ -370,7 +356,7 @@
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
"connection complete to %pI (%s)",
- connect_addr, connectname);
+ nexthop, connectname);
apr_table_setn(r->notes, "proxy-source-port", apr_psprintf(r->pool, "%hu",
backconn->local_addr->port));
--- httpd-2.4.2/modules/proxy/proxy_util.c
+++ httpd-2.4.2/modules/proxy/proxy_util.c
@@ -759,48 +759,63 @@
return host != NULL && ap_strstr_c(host, This->name) != NULL;
}
-/* checks whether a host in uri_addr matches proxyblock */
+/* Backwards-compatible interface. */
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf,
apr_sockaddr_t *uri_addr)
{
+ return ap_proxy_checkproxyblock2(r, conf, uri_addr->hostname, uri_addr);
+}
+
+#define MAX_IP_STR_LEN (46)
+
+PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf,
+ const char *hostname, apr_sockaddr_t *addr)
+{
int j;
- apr_sockaddr_t * src_uri_addr = uri_addr;
+
/* XXX FIXME: conf->noproxies->elts is part of an opaque structure */
for (j = 0; j < conf->noproxies->nelts; j++) {
struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
- struct apr_sockaddr_t *conf_addr = npent[j].addr;
- uri_addr = src_uri_addr;
+ struct apr_sockaddr_t *conf_addr;
+
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
"checking remote machine [%s] against [%s]",
- uri_addr->hostname, npent[j].name);
- if (ap_strstr_c(uri_addr->hostname, npent[j].name)
- || npent[j].name[0] == '*') {
+ hostname, npent[j].name);
+ if (ap_strstr_c(hostname, npent[j].name) || npent[j].name[0] == '*') {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00916)
"connect to remote machine %s blocked: name %s "
- "matched", uri_addr->hostname, npent[j].name);
+ "matched", hostname, npent[j].name);
return HTTP_FORBIDDEN;
}
- while (conf_addr) {
- uri_addr = src_uri_addr;
- while (uri_addr) {
- char *conf_ip;
- char *uri_ip;
- apr_sockaddr_ip_get(&conf_ip, conf_addr);
- apr_sockaddr_ip_get(&uri_ip, uri_addr);
+
+ /* No IP address checks if no IP address was passed in,
+ * i.e. the forward address proxy case, where this server does
+ * not resolve the hostname. */
+ if (!addr)
+ continue;
+
+ for (conf_addr = npent[j].addr; conf_addr; conf_addr = conf_addr->next) {
+ char caddr[MAX_IP_STR_LEN], uaddr[MAX_IP_STR_LEN];
+ apr_sockaddr_t *uri_addr;
+
+ if (apr_sockaddr_ip_getbuf(caddr, sizeof caddr, conf_addr))
+ continue;
+
+ for (uri_addr = addr; uri_addr; uri_addr = uri_addr->next) {
+ if (apr_sockaddr_ip_getbuf(uaddr, sizeof uaddr, uri_addr))
+ continue;
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
- "ProxyBlock comparing %s and %s", conf_ip,
- uri_ip);
- if (!apr_strnatcasecmp(conf_ip, uri_ip)) {
+ "ProxyBlock comparing %s and %s", caddr, uaddr);
+ if (!strcmp(caddr, uaddr)) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00917)
- "connect to remote machine %s blocked: "
- "IP %s matched", uri_addr->hostname, conf_ip);
+ "connect to remote machine %s blocked: "
+ "IP %s matched", hostname, caddr);
return HTTP_FORBIDDEN;
}
- uri_addr = uri_addr->next;
}
- conf_addr = conf_addr->next;
}
}
+
return OK;
}
@@ -2128,7 +2143,8 @@
}
}
/* check if ProxyBlock directive on this host */
- if (OK != ap_proxy_checkproxyblock(r, conf, conn->addr)) {
+ if (OK != ap_proxy_checkproxyblock2(r, conf, uri->hostname,
+ proxyname ? NULL : conn->addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
--- httpd-2.4.2/modules/proxy/mod_proxy.h
+++ httpd-2.4.2/modules/proxy/mod_proxy.h
@@ -534,6 +534,18 @@
char **passwordp, char **hostp, apr_port_t *port);
PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
+
+/** Test whether the hostname/address of the request are blocked by the ProxyBlock
+ * configuration.
+ * @param r request
+ * @param conf server configuration
+ * @param hostname hostname from request URI
+ * @param addr resolved address of hostname, or NULL if not known
+ * @return OK on success, or else an errro
+ */
+PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf,
+ const char *hostname, apr_sockaddr_t *addr);
+
PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
/* DEPRECATED (will be replaced with ap_proxy_connect_backend */
PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, request_rec *);
--- httpd-2.4.2/modules/proxy/mod_proxy_ftp.c
+++ httpd-2.4.2/modules/proxy/mod_proxy_ftp.c
@@ -1143,7 +1143,7 @@
}
/* check if ProxyBlock directive on this host */
- if (OK != ap_proxy_checkproxyblock(r, conf, connect_addr)) {
+ if (OK != ap_proxy_checkproxyblock2(r, conf, connectname, connect_addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
|
