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Fix #19294, Ruby NetHttpRequest improvements #20101

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merged 4 commits into from
Aug 12, 2025
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Fix #19294, Ruby NetHttpRequest improvements #20101

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9da94fb
Fix #19294, Ruby NetHttpRequest improvements
mschwager Jul 21, 2025
5192f31
Update expected test output
mschwager Jul 21, 2025
d8b9d4d
Add change-note
mschwager Jul 23, 2025
357964e
Remove duplicate lines and format query
mschwager Aug 11, 2025
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22 changes: 18 additions & 4 deletions ruby/ql/lib/codeql/ruby/frameworks/http_clients/NetHttp.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -12,15 +12,22 @@ private import codeql.ruby.DataFlow
/**
* A `Net::HTTP` call which initiates an HTTP request.
* ```ruby
* # one-off request
* Net::HTTP.get("http://example.com/")
* Net::HTTP.post("http://example.com/", "some_data")
* req = Net::HTTP.new("example.com")
* response = req.get("/")
*
* # connection re-use
* Net::HTTP.start("http://example.com") do |http|
* http.get("/")
* end
Comment on lines +20 to +24
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@mschwager mschwager Jul 21, 2025 •
edited
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Note that technically Net::HTTP.new does not open/reuse connections/sessions: https://docs.ruby-lang.org/en/master/Net/HTTP.html#method-c-new

* ```
*/
class NetHttpRequest extends Http::Client::Request::Range instanceof DataFlow::CallNode {
private DataFlow::CallNode request;
private API::Node requestNode;
API::Node requestNode;
API::Node connectionNode;

Check notice

Code scanning / CodeQL

Field only used in CharPred Note

Field is only used in CharPred.
private boolean returnsResponseBody;

NetHttpRequest() {
Expand All @@ -30,20 +37,27 @@ class NetHttpRequest extends Http::Client::Request::Range instanceof DataFlow::C
|
// Net::HTTP.get(...)
method in ["get", "get_response"] and
requestNode = API::getTopLevelMember("Net").getMember("HTTP").getReturn(method) and
connectionNode = API::getTopLevelMember("Net").getMember("HTTP") and
requestNode = connectionNode.getReturn(method) and
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You can move requestNode = connectionNode.getReturn(method) up after line 36, and then remove the three duplicated lines.

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It's curious to me that you can set requestNode before you've set connectionNode in this situation. I've made the requested change, but I'd like to learn more. Is there some documentation you can point me to describing this behavior, or is that "just the way it works" with queries?

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QL is a logic language, so you should not think of x = y as an assignment, but rather as a constraint (x must be equal to y). So the order doesn't really matter.

returnsResponseBody = true
or
// Net::HTTP.post(...).body
method in ["post", "post_form"] and
requestNode = API::getTopLevelMember("Net").getMember("HTTP").getReturn(method) and
connectionNode = API::getTopLevelMember("Net").getMember("HTTP") and
requestNode = connectionNode.getReturn(method) and
returnsResponseBody = false
or
// Net::HTTP.new(..).get(..).body
// Net::HTTP.start(..) do |http| http.get(..) end
method in [
"get", "get2", "request_get", "head", "head2", "request_head", "delete", "put", "patch",
"post", "post2", "request_post", "request"
] and
requestNode = API::getTopLevelMember("Net").getMember("HTTP").getInstance().getReturn(method) and
connectionNode = [
API::getTopLevelMember("Net").getMember("HTTP").getInstance(),
API::getTopLevelMember("Net").getMember("HTTP").getMethod("start").getBlock().getParameter(0)
] and
requestNode = connectionNode.getReturn(method) and
returnsResponseBody = false
)
}
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8 changes: 8 additions & 0 deletions ruby/ql/test/library-tests/frameworks/http_clients/NetHttp.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -27,3 +27,11 @@ def get(domain, path)
get("example.com", "/").body

Net::HTTP.post(uri, "some_body") # note: response body not accessed

http = Net::HTTP.new("https://example.com")
root_get = Net::HTTP::Get.new("/")
http.request(root_get)
Comment on lines +31 to +33
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This case was already detected without the above code modifications, but I wanted to make sure that request objects are also detected correctly.


Net::HTTP.start("https://example.com") do |http|
http.get("/")
end
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