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51 lines
2.2 KiB
51 lines
2.2 KiB
8 months ago
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diff --git a/src/ClientRequestContext.h b/src/ClientRequestContext.h
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index fe2edf6..47aa935 100644
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--- a/src/ClientRequestContext.h
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+++ b/src/ClientRequestContext.h
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@@ -81,6 +81,10 @@ public:
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#endif
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ErrorState *error; ///< saved error page for centralized/delayed processing
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bool readNextRequest; ///< whether Squid should read after error handling
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+
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+#if FOLLOW_X_FORWARDED_FOR
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+ size_t currentXffHopNumber = 0; ///< number of X-Forwarded-For header values processed so far
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+#endif
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};
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#endif /* SQUID_CLIENTREQUESTCONTEXT_H */
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diff --git a/src/client_side_request.cc b/src/client_side_request.cc
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index 1c6ff62..b758f6f 100644
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--- a/src/client_side_request.cc
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+++ b/src/client_side_request.cc
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@@ -78,6 +78,11 @@
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static const char *const crlf = "\r\n";
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#if FOLLOW_X_FORWARDED_FOR
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+
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+#if !defined(SQUID_X_FORWARDED_FOR_HOP_MAX)
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+#define SQUID_X_FORWARDED_FOR_HOP_MAX 64
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+#endif
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+
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static void clientFollowXForwardedForCheck(allow_t answer, void *data);
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#endif /* FOLLOW_X_FORWARDED_FOR */
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@@ -485,8 +490,16 @@ clientFollowXForwardedForCheck(allow_t answer, void *data)
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/* override the default src_addr tested if we have to go deeper than one level into XFF */
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Filled(calloutContext->acl_checklist)->src_addr = request->indirect_client_addr;
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}
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- calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
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- return;
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+ if (++calloutContext->currentXffHopNumber < SQUID_X_FORWARDED_FOR_HOP_MAX) {
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+ calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
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+ return;
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+ }
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+ const auto headerName = Http::HeaderLookupTable.lookup(Http::HdrType::X_FORWARDED_FOR).name;
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+ debugs(28, DBG_CRITICAL, "ERROR: Ignoring trailing " << headerName << " addresses" <<
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+ Debug::Extra << "addresses allowed by follow_x_forwarded_for: " << calloutContext->currentXffHopNumber <<
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+ Debug::Extra << "last/accepted address: " << request->indirect_client_addr <<
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+ Debug::Extra << "ignored trailing addresses: " << request->x_forwarded_for_iterator);
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+ // fall through to resume clientAccessCheck() processing
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}
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}
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