56 lines
2 KiB
Ruby
56 lines
2 KiB
Ruby
module SmimeHelper
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include OpenSSL
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INFINITE_EXPIRY = 1000.years
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SHORT_EXPIRY = 30.minutes
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def generate_root
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issue(signed_by: nil, expires_in: INFINITE_EXPIRY, certificate_authority: true)
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end
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def generate_cert(root_ca:, expires_in: SHORT_EXPIRY)
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issue(signed_by: root_ca, expires_in: expires_in, certificate_authority: false)
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end
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# returns a hash { key:, cert: } containing a generated key, cert pair
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def issue(email_address: 'test@example.com', signed_by:, expires_in:, certificate_authority:)
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key = OpenSSL::PKey::RSA.new(4096)
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public_key = key.public_key
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subject = if certificate_authority
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X509::Name.parse("/CN=EU")
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else
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X509::Name.parse("/CN=#{email_address}")
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end
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cert = X509::Certificate.new
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cert.subject = subject
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cert.issuer = signed_by&.fetch(:cert, nil)&.subject || subject
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cert.not_before = Time.now
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cert.not_after = expires_in.from_now
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cert.public_key = public_key
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cert.serial = 0x0
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cert.version = 2
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extension_factory = X509::ExtensionFactory.new
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if certificate_authority
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extension_factory.subject_certificate = cert
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extension_factory.issuer_certificate = cert
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cert.add_extension(extension_factory.create_extension('subjectKeyIdentifier', 'hash'))
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cert.add_extension(extension_factory.create_extension('basicConstraints', 'CA:TRUE', true))
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cert.add_extension(extension_factory.create_extension('keyUsage', 'cRLSign,keyCertSign', true))
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else
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cert.add_extension(extension_factory.create_extension('subjectAltName', "email:#{email_address}", false))
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cert.add_extension(extension_factory.create_extension('basicConstraints', 'CA:FALSE', true))
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cert.add_extension(extension_factory.create_extension('keyUsage', 'digitalSignature,keyEncipherment', true))
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cert.add_extension(extension_factory.create_extension('extendedKeyUsage', 'clientAuth,emailProtection', false))
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end
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cert.sign(signed_by&.fetch(:key, nil) || key, Digest::SHA256.new)
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{ key: key, cert: cert }
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end
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end
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