In #3708, we added formatters for the the convenience methods in the
`probs` package.
However, in #4783, @alexzorin pointed out that we were incorrectly
passing an error message through fmt.Sprintf as the format parameter
rather than as a value parameter.
I proposed a fix in #4784, but during code review we concluded that the
underlying problem was the pattern of using format-style functions that
don't have some variant of printf in the name. That makes this wrong:
`probs.DNS(err.Error())`, and this right: `probs.DNS("%s", err)`. Since
that's an easy mistake to make and a hard one to spot during code review,
we're going to stop using this particular pattern and call `fmt.Sprintf`
directly.
This PR reverts #3708 and adds some `fmt.Sprintf` where needed.
We've found we need the context offered from logging the error closer to when it
happens in the `bdns` package rather than in the `va`. Adopting the function
requires adapting it slightly. Specifically in the new location we know it won't
be called with any timeout results, with a non-dns error, or with a nil
underlying error.
Having the logging done in `bdns` (and specifically from `exchangeOne`) also
lets us log the wire format of the query and response when we get a `dns.ErrId`
error indicating a query/response ID mismatch. A small unit test is included
that ensures the logging happens as expected.
In case it proves useful for matching against other metrics the DNS ID mismatch
error case also now increments a dedicated prometheus counter vector stat,
`dns_id_mismatch`. The stat is labelled by resolver and query type.
Resolves https://github.com/letsencrypt/boulder/issues/4532
When we get a DNS error that has an internal cause (like connection
refused), we return a generic message like "networking error" to the
user to avoid revealing details that would be confusing. However, when
debugging problems with our own services, it's useful to have the
underlying errors.
This adds a helper method in the VA and calls it from each place we use
DNS errors.
This PR changes the VA to return `dns` problem type for errors when performing
HTTP-01 challenges for domains that have no IP addresses, or errors looking up
the IP addresses.
The `va.getAddrs` function is internal to the VA and can return
`berrors.BoulderError`s with a DNS type when there is an error, allowing the
calling code to convert this to a problem when required
using an updated `detailedError` function. This avoids some clunky conversion
the HTTP-01 code was doing that misrepresented DNS level errors as connection
problems with a DNS detail message.
In order to add an integration test for challenge validation that results in
`getAddrs` DNS level errors the Boulder tools image had to be bumped to a tag
that includes the latest `pebble-challtestsrv` that
supports mocking SERVFAILs. It isn't possible to mock this case with internal IP
addresses because our VA test configuration does not filter internal addresses
to support the testing context.
Additionally this branch removes the `UnknownHostProblem` from the `probs`
package:
1. It isn't used anywhere after 532c210
2. It's not a real RFC 8555 problem type. We should/do use the
DNS type for this.
Resolves https://github.com/letsencrypt/boulder/issues/4407
This will allow implementing sub-problems without creating a cyclic
dependency between `core` and `problems`.
The `identifier` package is somewhat small/single-purpose and in the
future we may want to move more "ACME" bits beyond the `identifier`
types into a dedicated package outside of `core`.
When I introduced the new HTTP-01 code I did it in `va/http.go` intending to try and make the very large `va.go` file a little bit smaller. This is the continuation of that work.
* f96ad92 - moves remaining HTTP-01 specific code to `va/http.go`.
* 1efb9a1 - moves TLS-ALPN-01 code into `va/tlsalpn.go`.
* 95ea567 - moves DNS-01 code into `va/dns.go`.
* 6ff0395 - moves unit tests from `va/va_test.go` into `va/http_test.go`, `va/tlsalpn_test.go` and `va/dns_test.go`.
In the end `va/va.go` contains code related to metrics, top level RPCs (e.g. `PerformValidation`), and the multi-VA code. This makes the file lengths much more manageable overall.
Note: There is certainly room for cleaning up some of the older unit test cruft from `va/va_test.go`. For now I only moved it as-is into the challenge specific test files.
Jacob Hoffman-Andrews