101 lines
2.8 KiB
Ruby
101 lines
2.8 KiB
Ruby
class SingleSignOn
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ACCESSORS = [:nonce, :name, :username, :email, :avatar_url, :avatar_force_update, :require_activation,
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:bio, :external_id, :return_sso_url, :admin, :moderator, :suppress_welcome_message, :title,
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:add_groups, :remove_groups, :groups, :profile_background_url, :card_background_url, :website]
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FIXNUMS = []
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BOOLS = [:avatar_force_update, :admin, :moderator, :require_activation, :suppress_welcome_message]
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NONCE_EXPIRY_TIME = 10.minutes
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attr_accessor(*ACCESSORS)
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attr_writer :sso_secret, :sso_url
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def self.sso_secret
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raise RuntimeError, "sso_secret not implemented on class, be sure to set it on instance"
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end
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def self.sso_url
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raise RuntimeError, "sso_url not implemented on class, be sure to set it on instance"
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end
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def self.parse(payload, sso_secret = nil)
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sso = new
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sso.sso_secret = sso_secret if sso_secret
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parsed = Rack::Utils.parse_query(payload)
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if sso.sign(parsed["sso"]) != parsed["sig"]
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diags = "\n\nsso: #{parsed["sso"]}\n\nsig: #{parsed["sig"]}\n\nexpected sig: #{sso.sign(parsed["sso"])}"
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if parsed["sso"] =~ /[^a-zA-Z0-9=\r\n\/+]/m
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raise RuntimeError, "The SSO field should be Base64 encoded, using only A-Z, a-z, 0-9, +, /, and = characters. Your input contains characters we don't understand as Base64, see http://en.wikipedia.org/wiki/Base64 #{diags}"
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else
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raise RuntimeError, "Bad signature for payload #{diags}"
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end
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end
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decoded = Base64.decode64(parsed["sso"])
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decoded_hash = Rack::Utils.parse_query(decoded)
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ACCESSORS.each do |k|
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val = decoded_hash[k.to_s]
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val = val.to_i if FIXNUMS.include? k
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if BOOLS.include? k
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val = ["true", "false"].include?(val) ? val == "true" : nil
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end
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sso.send("#{k}=", val)
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end
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decoded_hash.each do |k, v|
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if field = k[/^custom\.(.+)$/, 1]
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sso.custom_fields[field] = v
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end
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end
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sso
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end
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def diagnostics
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SingleSignOn::ACCESSORS.map { |a| "#{a}: #{send(a)}" }.join("\n")
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end
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def sso_secret
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@sso_secret || self.class.sso_secret
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end
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def sso_url
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@sso_url || self.class.sso_url
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end
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def custom_fields
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@custom_fields ||= {}
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end
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def sign(payload)
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OpenSSL::HMAC.hexdigest("sha256", sso_secret, payload)
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end
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def to_url(base_url = nil)
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base = "#{base_url || sso_url}"
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"#{base}#{base.include?('?') ? '&' : '?'}#{payload}"
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end
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def payload
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payload = Base64.strict_encode64(unsigned_payload)
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"sso=#{CGI::escape(payload)}&sig=#{sign(payload)}"
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end
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def unsigned_payload
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payload = {}
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ACCESSORS.each do |k|
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next if (val = send k) == nil
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payload[k] = val
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end
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@custom_fields&.each do |k, v|
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payload["custom.#{k}"] = v.to_s
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end
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Rack::Utils.build_query(payload)
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end
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end
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