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caddyhttp: Fix header matcher when using nil

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Uncovered in #3807
This commit is contained in:
Matthew Holt 2020-11-17 11:29:43 -07:00
parent 99b8f44486
commit 4fc570711e
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GPG Key ID: 2A349DD577D586A5
2 changed files with 14 additions and 0 deletions
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4
modules/caddyhttp/matchers.go
View File

@ -445,6 +445,10 @@ func matchHeaders(input, against http.Header, host string) bool {
// match if the header field exists at all
continue
}
if allowedFieldVals == nil && actualFieldVals == nil {
// a nil list means match if the header does not exist at all
continue
}
var match bool
fieldVals:
for _, actualFieldVal := range actualFieldVals {

10
modules/caddyhttp/matchers_test.go
View File

@ -480,6 +480,16 @@ func TestHeaderMatcher(t *testing.T) {
host: "caddyserver.com",
expect: false,
},
{
match: MatchHeader{"Must-Not-Exist": nil},
input: http.Header{},
expect: true,
},
{
match: MatchHeader{"Must-Not-Exist": nil},
input: http.Header{"Must-Not-Exist": []string{"do not match"}},
expect: false,
},
} {
req := &http.Request{Header: tc.input, Host: tc.host}
actual := tc.match.Match(req)