Generate Redfish enums from schemas

OpenBMC tends to have a significant problem in doing the appropriate
lookups from the schema files, and many bugs have been injected by users
picking a bad enum, or mistyping the casing of an enum value.

At the same time, nlohmann::json has recently added first class support
for enums, https://json.nlohmann.me/features/enum_conversion/

This commit attempts to build a set of redfish includes file with all
the available Redfish enums in an easy to use enum class.  This makes it
very clear which enums are supported by the schemas we produce, and adds
very little to no extra boilerplate on the human-written code we
produced previously.

Note, in the generated enum class, because of our use of the clang-tidy
check for macros, the clang-tidy check needs an exception for these
macros that don't technically follow the coding standard.  This seems
like a reasonable compromise, and in this case, given that nlohmann
doesn't support a non-macro version of this.

One question that arises is what this does to the binary size....  Under
the current compiler optimizations, and with the current best practices,
it leads to an overall increase in binary size of ~1200 bytes for the
enum machinery, then approximately 200 bytes for every call site we
switch over.  We should decide if this nominal increase is reasonable.

Tested: Redfish protocol validator runs with same number of failures as
previously.
Redfish Service Validator passes (one unrelated qemu-specific exception)

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I7c7ee4db0823f7c57ecaa59620b280b53a46e2c1
54 files changed
tree: 207fa734b40162e4953f4c8c229cbcfb4c02900d
  1. .github/
  2. config/
  3. http/
  4. include/
  5. redfish-core/
  6. scripts/
  7. src/
  8. static/
  9. subprojects/
  10. test/
  11. .clang-format
  12. .clang-tidy
  13. .dockerignore
  14. .gitignore
  15. .markdownlint.yaml
  16. .openbmc-enforce-gitlint
  17. .prettierignore
  18. .shellcheck
  19. CLIENTS.md
  20. COMMON_ERRORS.md
  21. DBUS_USAGE.md
  22. DEVELOPING.md
  23. HEADERS.md
  24. LICENSE
  25. meson.build
  26. meson_options.txt
  27. OEM_SCHEMAS.md
  28. OWNERS
  29. README.md
  30. Redfish.md
  31. run-ci
  32. setup.cfg
  33. TESTING.md
README.md

OpenBMC webserver

This component attempts to be a "do everything" embedded webserver for OpenBMC.

Features

The webserver implements a few distinct interfaces:

  • DBus event websocket. Allows registering on changes to specific dbus paths, properties, and will send an event from the websocket if those filters match.
  • OpenBMC DBus REST api. Allows direct, low interference, high fidelity access to dbus and the objects it represents.
  • Serial: A serial websocket for interacting with the host serial console through websockets.
  • Redfish: A protocol compliant, DBus to Redfish translator.
  • KVM: A websocket based implementation of the RFB (VNC) frame buffer protocol intended to mate to webui-vue to provide a complete KVM implementation.

Protocols

bmcweb at a protocol level supports http and https. TLS is supported through OpenSSL.

AuthX

Authentication

Bmcweb supports multiple authentication protocols:

  • Basic authentication per RFC7617
  • Cookie based authentication for authenticating against webui-vue
  • Mutual TLS authentication based on OpenSSL
  • Session authentication through webui-vue
  • XToken based authentication conformant to Redfish DSP0266

Each of these types of authentication is able to be enabled or disabled both via runtime policy changes (through the relevant Redfish APIs) or via configure time options. All authentication mechanisms supporting username/password are routed to libpam, to allow for customization in authentication implementations.

Authorization

All authorization in bmcweb is determined at routing time, and per route, and conform to the Redfish PrivilegeRegistry.

*Note: Non-Redfish functions are mapped to the closest equivalent Redfish privilege level.

Configuration

bmcweb is configured per the meson build files. Available options are documented in meson_options.txt

Compile bmcweb with default options

meson builddir
ninja -C builddir

If any of the dependencies are not found on the host system during configuration, meson will automatically download them via its wrap dependencies mentioned in bmcweb/subprojects.

Debug logging

bmcweb by default is compiled with runtime logging disabled, as a performance consideration. To enable it in a standalone build, add the

-Dlogging='enabled'

option to your configure flags. If building within Yocto, add the following to your local.conf.

EXTRA_OEMESON:pn-bmcweb:append = "-Dbmcweb-logging='enabled'"

Use of persistent data

bmcweb relies on some on-system data for storage of persistent data that is internal to the process. Details on the exact data stored and when it is read/written can seen from the persistent_data namespace.

TLS certificate generation

When SSL support is enabled and a usable certificate is not found, bmcweb will generate a self-signed a certificate before launching the server. Please see the bmcweb source code for details on the parameters this certificate is built with.