Correct c-struct 'null' checks, fix failing tests due to expired certs, improve openssl error handling #74
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'-a stderr -a stdout' is unneeded since that's the default, and '-i' already does '-a stdin' so that was redundant. Setting the entrypoint to empty string was also really weird!
Some of the testcerts expired in 2017, so tests started failing! This regenerates them with fairly similar certificates. The script used to generate them is included for regeneration. Test changes, to use these new certs, follow in the next commit.
This replaces hardcoded certificates with loading them from disk for the tests. This allows swapping around certs much more easily. This also swaps out all expired certs so tests pass again.
In luajit, a null pointer is distinct from nil, and thus "truthy". That is to say, `if not c_ffi_struct` will never evaluate to true, even if the struct is null. However, a null ffi struct does compare equal to nil, so the new comparison corrects this issue. This fixes numerous bugs in this library, including multiple cases of uninitialized data being passed into functions leading to null pointer dereferences, buffer overflows, and more.
Openssl maintains an error queue. A given function may add multiple errors to that queue, and only printing the last one is worse than printing the whole thing. In fact, as it was implemented before, the output was not consistent; e.g. the same error could produce different messages.
The null check issue would result in totally invalid pubkeys not bailing out the whole thing. This adds a test which failed prior to the null struct fix.
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Ope, just now seeing this! Adding this to my new fork at https://github.com/cdbattags/lua-resty-jwt. |
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This PR does a lot because, well, to make the tests not fail due to frankdd certs that expired in late 2017, a lot of stuff was required.
The main point of this PR, however, is the "Correct c-struct 'null' checks" commit.
The use of
if not c_structto check whether something was null didn't work, and so it was fairly easy to end up with memory unsafe behaviour when anything other than the completely happy path was hit in the openssl integration.cc @SkyLothar