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Original file line number | Diff line number | Diff line change |
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defmodule Jwt.FirebaseCerts.PublicKey do | ||
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@httpclient Jwt.HttpCacheClient | ||
@certs_url "https://www.googleapis.com/robot/v1/metadata/x509/[email protected]" | ||
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def getfor(id), do: fetch id | ||
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defp fetch(id) do | ||
@httpclient.get!(@certs_url) | ||
|> get_response_body | ||
|> extract_public_key_for_id(id) | ||
end | ||
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defp get_response_body(%{body: body, headers: _headers, status_code: 200}), do: {:ok, body} | ||
defp get_response_body(%{body: body, headers: _headers, status_code: _status_code}), do: {:error, body} | ||
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defp extract_public_key_for_id({:error, _}, _id), do: nil | ||
defp extract_public_key_for_id({:ok, body}, id) do | ||
{:ok, parsed} = Poison.Parser.parse body | ||
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cert = parsed[id] | ||
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case cert do | ||
nil -> {:error, "Public key id not found"} | ||
cert_string -> Jwt.PemParser.extract_exponent_and_modulus_from_pem_cert cert_string | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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defmodule Jwt.PemParser do | ||
def extract_exponent_and_modulus_from_pem_cert(pem_cert) do | ||
[{_, dert, _}] = :public_key.pem_decode(pem_cert) | ||
otp = :public_key.pkix_decode_cert(dert, :otp) | ||
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[_, mod, exp] = otp | ||
|> Tuple.to_list | ||
|> Enum.slice(1..1) | ||
|> hd | ||
|> Tuple.to_list | ||
|> Enum.slice(7..7) | ||
|> hd | ||
|> Tuple.to_list | ||
|> Enum.slice(2..2) | ||
|> hd | ||
|> Tuple.to_list | ||
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{:ok, %{exp: exp, mod: mod}} | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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defmodule FirebaseCertsTest do | ||
use ExUnit.Case, async: true | ||
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require Logger | ||
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@certificate "-----BEGIN CERTIFICATE-----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\nNN45J+dag1ZeKxu1Ugc9p2IQB1RMtLMfGmaBldHQ5dY=\n-----END CERTIFICATE-----\n" | ||
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@header "eyJhbGciOiJSUzI1NiIsImtpZCI6ImU3MGRiMDg5MzU5MDBkNTY0YWFiMjdiMzllNmJkNWM4NDdkMDQxM2QifQ" | ||
@claims "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" | ||
@signature "tk8mTHJnRCqn1KQ0Ha5R_34sOWYoxV0QFCgLQ32UCLWy00kkq_waLyoYdb7G7Tns6dLk6e2rPcrz97JCcWTCqD3erMd9oN2IyqAGPUOU7FJr8PjtaMzHWDUdTinI05sKpRJNxMcEiP7Wd0VKk4ubuImbO7MphKZL5-KLz2KTcQztQaJC0dw1Ey3mBCSbdOkIMuTxCzfjkvXrbmGirIAfn8INJyIEg8Vnav-NaBT5ShIcie_ovVZy97iReNcubRZn34ipMQrai_k_JaRjlVMn0m0u9dee44S4XHlvdC4hkC-DpBZubDDj3BVQq-Ztk9H9CZREuPUjdfy3anflBE_BwQ" | ||
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test "Verify signature Firebase certificate" do | ||
[{_, dert, _}] = :public_key.pem_decode(@certificate) | ||
otp = :public_key.pkix_decode_cert(dert, :otp) | ||
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[_, mod, exp] = otp | ||
|> Tuple.to_list | ||
|> Enum.slice(1..1) | ||
|> hd | ||
|> Tuple.to_list | ||
|> Enum.slice(7..7) | ||
|> hd | ||
|> Tuple.to_list | ||
|> Enum.slice(2..2) | ||
|> hd | ||
|> Tuple.to_list | ||
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pk = [exp, mod] | ||
signature = Base.url_decode64! @signature, padding: false | ||
msg = @header <> "." <> @claims | ||
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assert :crypto.verify :rsa, :sha256, msg, signature, pk | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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defmodule Jwt.FirebaseCerts.PublicKey.Mock do | ||
require Logger | ||
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@certificate "-----BEGIN CERTIFICATE-----\nMIIDHDCCAgSgAwIBAgIIHCf0ZvzSh6gwDQYJKoZIhvcNAQEFBQAwMTEvMC0GA1UE\nAxMmc2VjdXJldG9rZW4uc3lzdGVtLmdzZXJ2aWNlYWNjb3VudC5jb20wHhcNMTcw\nMTAzMDA0NTI2WhcNMTcwMTA2MDExNTI2WjAxMS8wLQYDVQQDEyZzZWN1cmV0b2tl\nbi5zeXN0ZW0uZ3NlcnZpY2VhY2NvdW50LmNvbTCCASIwDQYJKoZIhvcNAQEBBQAD\nggEPADCCAQoCggEBAMew823wkK4hu02ROzImYBkryY8V6hH5aKbIcbXoaktTn/en\n5PB29MFqgy5GXrPsg6knIxsx2RR+yX5qWvMJJlxYz/NytMNkgFZPh+wtgEG0XmA5\n34J1nS6p9Lg/5jgxTyDmN9/WOj9Ml4DgQSFzz4f4AGwStw+dOERXBz+wASrs+8qL\ntxLt/Z2ENAqMDnxaY8VdOqNlFeQuBca3KQsZEvv3jObFGwrtFsCa+gnQ2JNYCACz\nuaJou68I4P0SOc17NqX8NZtyW/UmBam2WEHfE9C8qGUk96sfIktSL5MwRYQyl3UP\nU+SiorVkGBJgTGMHSymsbR/Ia4tB+nQ4KIuEbWUCAwEAAaM4MDYwDAYDVR0TAQH/\nBAIwADAOBgNVHQ8BAf8EBAMCB4AwFgYDVR0lAQH/BAwwCgYIKwYBBQUHAwIwDQYJ\nKoZIhvcNAQEFBQADggEBAJ3M+1HJTt/IQZ/09eW8B9gwgBBVhawZ1n0+aY7SuKSB\njHz474nUlQVz6SxBmeVScb9IXh2lL1K+YYrP/O7sP/OUYXHfjxKGNFMDl/lo/Pgq\nMmSOXnvbvEOgXrsgF8/ytj2BEyMe7wuZC7impUCkbarV4FKcvqjff1iLzAKWn4et\nRJJEyEngemOfAl2l9JBuQG/mouOyapv1g7B9mfRTTYKtbFl1o3N1GJtWC78pD+K9\noawYyz9tiGmm8IKW/KYiJhj616eq06ugEb3VHDjFL+hjGPmORPUND/al+XibYU/q\nNN45J+dag1ZeKxu1Ugc9p2IQB1RMtLMfGmaBldHQ5dY=\n-----END CERTIFICATE-----\n" | ||
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def getfor(id) do | ||
Jwt.PemParser.extract_exponent_and_modulus_from_pem_cert @certificate | ||
end | ||
end |
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