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authorNick Mathewson <nickm@torproject.org>2011-02-21 16:09:23 -0500
committerNick Mathewson <nickm@torproject.org>2011-02-21 16:09:23 -0500
commitd673479ebaa29b2dc8f227c342785112c945ec18 (patch)
tree34407f050e03c1e0b91055b6e06cef227286bee4 /doc/spec/proposals/129-reject-plaintext-ports.txt
parent9b745cdbf9cd7384e44e18bf40a3d2c9becbc345 (diff)
parent7bdb7d4811bb5ff027e124e6558181167c2e2f91 (diff)
downloadtor-d673479ebaa29b2dc8f227c342785112c945ec18.tar
tor-d673479ebaa29b2dc8f227c342785112c945ec18.tar.gz
Merge remote branch 'origin/maint-0.2.1' into maint-0.2.2
Conflicts: doc/Makefile.am doc/spec/Makefile.am doc/spec/address-spec.txt doc/spec/bridges-spec.txt doc/spec/control-spec-v0.txt doc/spec/control-spec.txt doc/spec/dir-spec-v1.txt doc/spec/dir-spec-v2.txt doc/spec/dir-spec.txt doc/spec/path-spec.txt doc/spec/proposals/000-index.txt doc/spec/proposals/001-process.txt doc/spec/proposals/098-todo.txt doc/spec/proposals/099-misc.txt doc/spec/proposals/100-tor-spec-udp.txt doc/spec/proposals/101-dir-voting.txt doc/spec/proposals/102-drop-opt.txt doc/spec/proposals/103-multilevel-keys.txt doc/spec/proposals/104-short-descriptors.txt doc/spec/proposals/105-handshake-revision.txt doc/spec/proposals/106-less-tls-constraint.txt doc/spec/proposals/107-uptime-sanity-checking.txt doc/spec/proposals/108-mtbf-based-stability.txt doc/spec/proposals/109-no-sharing-ips.txt doc/spec/proposals/110-avoid-infinite-circuits.txt doc/spec/proposals/111-local-traffic-priority.txt doc/spec/proposals/112-bring-back-pathlencoinweight.txt doc/spec/proposals/113-fast-authority-interface.txt doc/spec/proposals/114-distributed-storage.txt doc/spec/proposals/115-two-hop-paths.txt doc/spec/proposals/116-two-hop-paths-from-guard.txt doc/spec/proposals/117-ipv6-exits.txt doc/spec/proposals/118-multiple-orports.txt doc/spec/proposals/119-controlport-auth.txt doc/spec/proposals/120-shutdown-descriptors.txt doc/spec/proposals/121-hidden-service-authentication.txt doc/spec/proposals/122-unnamed-flag.txt doc/spec/proposals/123-autonaming.txt doc/spec/proposals/124-tls-certificates.txt doc/spec/proposals/125-bridges.txt doc/spec/proposals/126-geoip-reporting.txt doc/spec/proposals/127-dirport-mirrors-downloads.txt doc/spec/proposals/128-bridge-families.txt doc/spec/proposals/129-reject-plaintext-ports.txt doc/spec/proposals/130-v2-conn-protocol.txt doc/spec/proposals/131-verify-tor-usage.txt doc/spec/proposals/132-browser-check-tor-service.txt doc/spec/proposals/134-robust-voting.txt doc/spec/proposals/135-private-tor-networks.txt doc/spec/proposals/137-bootstrap-phases.txt doc/spec/proposals/138-remove-down-routers-from-consensus.txt doc/spec/proposals/140-consensus-diffs.txt doc/spec/proposals/141-jit-sd-downloads.txt doc/spec/proposals/142-combine-intro-and-rend-points.txt doc/spec/proposals/143-distributed-storage-improvements.txt doc/spec/proposals/145-newguard-flag.txt doc/spec/proposals/146-long-term-stability.txt doc/spec/proposals/147-prevoting-opinions.txt doc/spec/proposals/148-uniform-client-end-reason.txt doc/spec/proposals/149-using-netinfo-data.txt doc/spec/proposals/150-exclude-exit-nodes.txt doc/spec/proposals/151-path-selection-improvements.txt doc/spec/proposals/152-single-hop-circuits.txt doc/spec/proposals/153-automatic-software-update-protocol.txt doc/spec/proposals/154-automatic-updates.txt doc/spec/proposals/155-four-hidden-service-improvements.txt doc/spec/proposals/156-tracking-blocked-ports.txt doc/spec/proposals/157-specific-cert-download.txt doc/spec/proposals/158-microdescriptors.txt doc/spec/proposals/159-exit-scanning.txt doc/spec/proposals/ideas/xxx-hide-platform.txt doc/spec/proposals/ideas/xxx-port-knocking.txt doc/spec/proposals/ideas/xxx-separate-streams-by-port.txt doc/spec/proposals/ideas/xxx-what-uses-sha1.txt doc/spec/proposals/reindex.py doc/spec/rend-spec.txt doc/spec/socks-extensions.txt doc/spec/tor-spec.txt doc/spec/version-spec.txt
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-Filename: 129-reject-plaintext-ports.txt
-Title: Block Insecure Protocols by Default
-Author: Kevin Bauer & Damon McCoy
-Created: 2008-01-15
-Status: Closed
-Implemented-In: 0.2.0.x
-
-Overview:
-
- Below is a proposal to mitigate insecure protocol use over Tor.
-
- This document 1) demonstrates the extent to which insecure protocols are
- currently used within the Tor network, and 2) proposes a simple solution
- to prevent users from unknowingly using these insecure protocols. By
- insecure, we consider protocols that explicitly leak sensitive user names
- and/or passwords, such as POP, IMAP, Telnet, and FTP.
-
-Motivation:
-
- As part of a general study of Tor use in 2006/2007 [1], we attempted to
- understand what types of protocols are used over Tor. While we observed a
- enormous volume of Web and Peer-to-peer traffic, we were surprised by the
- number of insecure protocols that were used over Tor. For example, over an
- 8 day observation period, we observed the following number of connections
- over insecure protocols:
-
- POP and IMAP:10,326 connections
- Telnet: 8,401 connections
- FTP: 3,788 connections
-
- Each of the above listed protocols exchange user name and password
- information in plain-text. As an upper bound, we could have observed
- 22,515 user names and passwords. This observation echos the reports of
- a Tor router logging and posting e-mail passwords in August 2007 [2]. The
- response from the Tor community has been to further educate users
- about the dangers of using insecure protocols over Tor. However, we
- recently repeated our Tor usage study from last year and noticed that the
- trend in insecure protocol use has not declined. Therefore, we propose that
- additional steps be taken to protect naive Tor users from inadvertently
- exposing their identities (and even passwords) over Tor.
-
-Security Implications:
-
- This proposal is intended to improve Tor's security by limiting the
- use of insecure protocols.
-
- Roger added: By adding these warnings for only some of the risky
- behavior, users may do other risky behavior, not get a warning, and
- believe that it is therefore safe. But overall, I think it's better
- to warn for some of it than to warn for none of it.
-
-Specification:
-
- As an initial step towards mitigating the use of the above-mentioned
- insecure protocols, we propose that the default ports for each respective
- insecure service be blocked at the Tor client's socks proxy. These default
- ports include:
-
- 23 - Telnet
- 109 - POP2
- 110 - POP3
- 143 - IMAP
-
- Notice that FTP is not included in the proposed list of ports to block. This
- is because FTP is often used anonymously, i.e., without any identifying
- user name or password.
-
- This blocking scheme can be implemented as a set of flags in the client's
- torrc configuration file:
-
- BlockInsecureProtocols 0|1
- WarnInsecureProtocols 0|1
-
- When the warning flag is activated, a message should be displayed to
- the user similar to the message given when Tor's socks proxy is given an IP
- address rather than resolving a host name.
-
- We recommend that the default torrc configuration file block insecure
- protocols and provide a warning to the user to explain the behavior.
-
- Finally, there are many popular web pages that do not offer secure
- login features, such as MySpace, and it would be prudent to provide
- additional rules to Privoxy to attempt to protect users from unknowingly
- submitting their login credentials in plain-text.
-
-Compatibility:
-
- None, as the proposed changes are to be implemented in the client.
-
-References:
-
- [1] Shining Light in Dark Places: A Study of Anonymous Network Usage.
- University of Colorado Technical Report CU-CS-1032-07. August 2007.
-
- [2] Rogue Nodes Turn Tor Anonymizer Into Eavesdropper's Paradise.
- http://www.wired.com/politics/security/news/2007/09/embassy_hacks.
- Wired. September 10, 2007.
-
-Implementation:
-
- Roger added this feature in
- http://archives.seul.org/or/cvs/Jan-2008/msg00182.html
- He also added a status event for Vidalia to recognize attempts to use
- vulnerable-plaintext ports, so it can help the user understand what's
- going on and how to fix it.
-
-Next steps:
-
- a) Vidalia should learn to recognize this controller status event,
- so we don't leave users out in the cold when we enable this feature.
-
- b) We should decide which ports to reject by default. The current
- consensus is 23,109,110,143 -- the same set that we warn for now.
-