Jacob Burroughs 4469b56925
Fix pkcs7 parsing in some cases (#12519)
* Fix pkcs7 parsing in some cases

brings in https://github.com/mozilla-services/pkcs7/pull/61 from upstream

In some cases but not all, aws includes a certificate in the pkcs7 response,
and currently vault fails to parse those certificates:
```
URL: PUT https://vault.example.com/v1/auth/aws/login
Code: 500. Errors
* failed to parse the BER encoded PKCS#7 signature: ber2der: Invalid BER format
```

This fixes logins on those instances.  Note we could not readily ascertain why
some instances have those certificates and others don't.

* Add changelog entry

* Correct missed line
2021-09-10 12:17:03 -04:00
..

PKCS7

This code is used to verify PKCS7 signatures for the EC2 auth method. The code was forked from mozilla-services/pkcs7 and modified for Vault.