mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-14 07:03:44 +01:00
45 lines
2.2 KiB
Plaintext
45 lines
2.2 KiB
Plaintext
1. Scanning process
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A. Non-HTML/JS HTTP mime types compared via SHA1 hash
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B. Dynamic HTTP content filtered at 4 levels:
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1. IP change+Tor cookie utilization
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- Tor cookies replayed with new IP in case of changes
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2. HTML Tag+Attribute+JS comparison
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- Comparisons made based only on "relevant" HTML tags
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and attributes
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3. HTML Tag+Attribute+JS diffing
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- Tags, attributes and JS AST nodes that change during
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Non-Tor fetches pruned from comparison
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4. URLS with > N% of node failures removed
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- results purged from filesystem at end of scan loop
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C. SSL scanning handles some forms of dynamic certs
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1. Catalogs certs for all IPs resolved locally
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by getaddrinfo over the duration of the scan.
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- Updated each test.
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2. If the domain presents a new cert for each IP, this
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is noted on the failure result for the node
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3. If the same IP presents two different certs locally,
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the cert list is first refreshed, and if it happens
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again, discarded
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4. A N% node failure filter also applies
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D. Scanner can be restarted from any point in the event
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of scanner or system crashes, or graceful shutdown.
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- Results+scan state pickled to filesystem continuously
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2. Cron job checks results periodically for reporting
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A. Divide failures into three types of BadExit based on type
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and frequency over time and incident rate
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B. write reject lines to approved-routers for those three types:
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1. ID Hex based (for misconfig/network problems easily fixed)
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2. IP based (for content modification)
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3. IP+mask based (for continuous/egregious content modification)
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C. Emails results to tor-scanners@freehaven.net
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3. Human Review and Appeal
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A. ID Hex-based BadExit is meant to be possible to removed easily
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without needing to beg us.
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- Should this behavior be encouraged?
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B. Optionally can reserve IP based badexits for human review
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1. Results are encapsulated fully on the filesystem and can be
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reviewed without network access
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2. Soat has --rescan to rescan failed nodes from a data directory
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- New set of URLs used
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