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60 lines
2.1 KiB
Plaintext
60 lines
2.1 KiB
Plaintext
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Filename: xxx-separate-streams-by-port.txt
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Title: Separate streams across circuits by destination port
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Author: Robert Hogan
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Created: 21-Oct-2008
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Status: Draft
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Here's a patch Robert Hogan wrote to use only one destination port per
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circuit. It's based on a wishlist item Roger wrote, to never send AIM
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usernames over the same circuit that we're hoping to browse anonymously
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through. The remaining open question is: how many extra circuits does this
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cause an ordinary user to create? My guess is not very many, but I'm wary
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of putting this in until we have some better estimate. On the other hand,
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not putting it in means that we have a known security flaw. Hm.
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Index: src/or/or.h
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===================================================================
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--- src/or/or.h (revision 17143)
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+++ src/or/or.h (working copy)
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@@ -1874,6 +1874,7 @@
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uint8_t state; /**< Current status of this circuit. */
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uint8_t purpose; /**< Why are we creating this circuit? */
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+ uint16_t service; /**< Port conn must have to use this circuit. */
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/** How many relay data cells can we package (read from edge streams)
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* on this circuit before we receive a circuit-level sendme cell asking
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Index: src/or/circuituse.c
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===================================================================
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--- src/or/circuituse.c (revision 17143)
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+++ src/or/circuituse.c (working copy)
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@@ -62,10 +62,16 @@
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return 0;
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}
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- if (purpose == CIRCUIT_PURPOSE_C_GENERAL)
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+ if (purpose == CIRCUIT_PURPOSE_C_GENERAL) {
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if (circ->timestamp_dirty &&
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circ->timestamp_dirty+get_options()->MaxCircuitDirtiness <= now)
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return 0;
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+ /* If the circuit is dirty and used for services on another port,
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+ then it is not suitable. */
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+ if (circ->service && conn->socks_request->port &&
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+ (circ->service != conn->socks_request->port))
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+ return 0;
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+ }
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/* decide if this circ is suitable for this conn */
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@@ -1351,7 +1357,9 @@
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if (connection_ap_handshake_send_resolve(conn) < 0)
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return -1;
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}
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-
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+ if (conn->socks_request->port
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+ && (TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_C_GENERAL))
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+ TO_CIRCUIT(circ)->service = conn->socks_request->port;
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return 1;
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}
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