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Rewrite signature verification using regexps and StringScanner
(#29133)
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@ -11,43 +11,30 @@ class SignatureParser
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# In addition, ignore a `Signature ` string prefix that was added by old versions
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# of `node-http-signatures`
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class SignatureParamsParser < Parslet::Parser
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rule(:token) { match("[0-9a-zA-Z!#$%&'*+.^_`|~-]").repeat(1).as(:token) }
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rule(:quoted_string) { str('"') >> (qdtext | quoted_pair).repeat.as(:quoted_string) >> str('"') }
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# qdtext and quoted_pair are not exactly according to spec but meh
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rule(:qdtext) { match('[^\\\\"]') }
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rule(:quoted_pair) { str('\\') >> any }
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rule(:bws) { match('\s').repeat }
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rule(:param) { (token.as(:key) >> bws >> str('=') >> bws >> (token | quoted_string).as(:value)).as(:param) }
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rule(:comma) { bws >> str(',') >> bws }
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# Old versions of node-http-signature add an incorrect "Signature " prefix to the header
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rule(:buggy_prefix) { str('Signature ') }
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rule(:params) { buggy_prefix.maybe >> (param >> (comma >> param).repeat).as(:params) }
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root(:params)
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end
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class SignatureParamsTransformer < Parslet::Transform
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rule(params: subtree(:param)) do
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(param.is_a?(Array) ? param : [param]).each_with_object({}) { |(key, value), hash| hash[key] = value }
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end
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rule(param: { key: simple(:key), value: simple(:val) }) do
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[key, val]
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end
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rule(quoted_string: simple(:string)) do
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string.to_s
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end
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rule(token: simple(:string)) do
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string.to_s
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end
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end
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TOKEN_RE = /[0-9a-zA-Z!#$%&'*+.^_`|~-]+/
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# qdtext and quoted_pair are not exactly according to spec but meh
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QUOTED_STRING_RE = /"([^\\"]|(\\.))*"/
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PARAM_RE = /(?<key>#{TOKEN_RE})\s*=\s*((?<value>#{TOKEN_RE})|(?<quoted_value>#{QUOTED_STRING_RE}))/
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def self.parse(raw_signature)
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tree = SignatureParamsParser.new.parse(raw_signature)
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SignatureParamsTransformer.new.apply(tree)
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rescue Parslet::ParseFailed
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# Old versions of node-http-signature add an incorrect "Signature " prefix to the header
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raw_signature = raw_signature.delete_prefix('Signature ')
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params = {}
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scanner = StringScanner.new(raw_signature)
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# Use `skip` instead of `scan` as we only care about the subgroups
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while scanner.skip(PARAM_RE)
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# This is not actually correct with regards to quoted pairs, but it's consistent
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# with our previous implementation, and good enough in practice.
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params[scanner[:key]] = scanner[:value] || scanner[:quoted_value][1...-1]
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scanner.skip(/\s*/)
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return params if scanner.eos?
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raise ParsingError unless scanner.skip(/\s*,\s*/)
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end
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raise ParsingError
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end
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end
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@ -10,12 +10,12 @@ RSpec.describe SignatureParser do
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let(:header) do
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# This example signature string deliberately mixes uneven spacing
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# and quoting styles to ensure everything is covered
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'keyId = "https://remote.domain/users/bob#main-key",algorithm= rsa-sha256 , headers="host date digest (request-target)",signature="gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ=="' # rubocop:disable Layout/LineLength
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'keyId = "https://remote.domain/users/bob#main-key,",algorithm= rsa-sha256 , headers="host date digest (request-target)",signature="gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ=="' # rubocop:disable Layout/LineLength
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end
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it 'correctly parses the header' do
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expect(subject).to eq({
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'keyId' => 'https://remote.domain/users/bob#main-key',
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'keyId' => 'https://remote.domain/users/bob#main-key,',
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'algorithm' => 'rsa-sha256',
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'headers' => 'host date digest (request-target)',
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'signature' => 'gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ==', # rubocop:disable Layout/LineLength
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