typosquat: add suffix checks #7571
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This extends our new typosquatting checks (see rust-lang#7206) to detect an attack vector we've seen more recently where a bad actor tries to squat an existing, popular crate by adding or removing a common suffix (such as `-rs` or `-sys`). The suffix list in the configuration has been taken _approximately_ from the most popular suffixes in the existing set of crates, with a small amount of human judgement involved on which ones are more likely to be abused based on recent incidents.
LawnGnome
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In rust-lang#7571, we added checks for crate names that added or removed suffixes from popular crates. This has turned out to be a useful check! (Spoiler alert for the blog post I'm publishing next week.) @Turbo87 pointed out that this can also apply to prefixes, especially `cargo-`. This generalises the suffix check to also check prefixes, and adjusts the typomania configuration to add `cargo` to the list of interesting affixes. For now, the same set of affixes will be used for both, but depending on what we see, a future tweak would be to separate the prefix and suffix lists. Let's see how that pans out. In terms of implementation, I briefly toyed with making this generic over the prefix/suffix combination to remove the copy/paste code, then was reminded by rust-analyzer that `std::str::pattern::Pattern` isn't stable. I'd rather duplicate 20 lines than deal with that, so here we are.
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This extends our new typosquatting checks (see #7206) to detect an attack vector we've seen more recently where a bad actor tries to squat an existing, popular crate by adding or removing a common suffix (such as
-rsor-sys).The suffix list in the configuration has been taken approximately from the most popular suffixes in the existing set of crates, with a small amount of human judgement involved on which ones are more likely to be abused based on recent incidents.
Most of this PR is actually tests by weight.