As this project isn't exactly python focused apart from the test suite, I'll assume other contributors are probably not as experienced with python either. Since this is a rather technical test, the extra comments should help grok the functionality without floundering around with the docs.
When the subprocess raises an exception due to an issue with the command (_eg using `-CAfile` arg to `openssl` with an invalid path_), the tests would output large walls of text that wasn't particularly helpful in troubleshooting the issue. `stderr` was also leaking out inbetween the test case results in the terminal, this has been resolved by ensuring that output is caught and piped, which keeps it available to python when an exception is raised. Identifying the actual error cause and location is now much nicer.
Updated the output to be plain string content instead of byte strings, this works fine :)
Adds back the ability to avoid using DH params, provided no file was explicitly supplied.
This used to be `DHPARAM_GENERATION=false`, the equivalent is now `DHPARAM_SKIP=1` (default 0). Previous name was no longer appropriate.
Ensures that if a user has explicitly provided their own dhparam file to still output a warning instead of the skip message, since `DHPARAM_SKIP=1` doesn't disable the support in nginx.
- `dhparam_generation` tests are no longer necessary, dropped.
Modified the remaining `dhparam` test to use multiple `nginx-proxy` images to verify correct behavior for different configs.
Tests now cover:
- Default (ffdhe4096) is used.
- Alternative via ENV (ffdhe2048) works correctly.
- Invalid group via ENV (1024-bit) fails.
- Custom DH params provided via file mount works with warning emitted.
---
- `assert_log_contains`: added a `container_name` arg with `nginxproxy` as the default value. This allows multiple nginx-proxy containers to utilize this method instead.
- Extracted out the `openssl` test (_to `negotiate_cipher()`_) and modified it to be a bit more flexible. It now takes a container with optional extra args to pass to `openssl` command called, as well as the `grep` string to match. This made the original test redundant, so I've dropped it.
- Added two methods to use `negotiate_cipher()`, one verifies a DHE cipher suite was negotiated and checks that a DH emphermal key was also mentioned in the output. The other method verifies the expectation of failing to negotiate a valid cipher if DH params have not been set, while verifying that non-DHE cipher suites can be successfully negotiated.
- Added a `get_env()` method for extracting attached environments on a container. This is useful for verifying invalid `DHPARAM_BITS` values (eg `1024`-bit).
- The original `Server Temp Key` assertion was incorrect, it was expecting a value that is unrelated to DHE cipher suite support (_`X25519` is related to ECDHE_). This is due to TLS 1.3 being negotiated where you cannot use custom DH params, nor influence the negotiated cipher due to this mechanism changing from TLS 1.3. TLS 1.3 does support DH params, but it internally negotiates RFC 7919 group between server and client instead. Thus to verify expectations, the connection via `openssl` is made explicitly with TLS 1.2 instead.
Check that when multiple containers have the same WIRTUAL_HOST and one of
them is unreachable, the resulting `upstream` block has no
`server 127.0.0.1 down;` entry.
