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gerrit.openbmc.org / openbmc / bmcweb / 3909dc82a003893812f598434d6c4558107afa28
commit3909dc82a003893812f598434d6c4558107afa28[log] [tgz]
authorJames Feist <james.feist@linux.intel.com>Fri Apr 03 10:58:55 2020 -0700
committerJames Feist <james.feist@linux.intel.com>Thu Jul 16 01:02:55 2020 +0000
treeb5c39fbb7d66ad9134a4f0fcecaa12c9346c5752
parente7808c93f01081ca12e1b4769691b5ae673f9017 [diff]
Rework Authorization flow

Currently we parse the whole message before authenticating,
allowing an attacker the ability to upload a large image,
or keep a connection open for the max amount of time easier
than it should be. This moves the authentication to the
earliest point possible, and restricts unauthenticated users
timeouts and max upload sizes. It also makes it so that
unauthenticated users cannot keep the connection alive
forever by refusing to close the connection.

Tested:
- login/logout
- firmware update
- large POST when unauthenticated
- timeouts when unauthenticated
- slowhttptest

Change-Id: Ifa02d8db04eac1821e8950eb85e71634a9e6d265
Signed-off-by: James Feist <james.feist@linux.intel.com>
12 files changed
tree: b5c39fbb7d66ad9134a4f0fcecaa12c9346c5752
  1. cmake/
  2. http/
  3. include/
  4. redfish-core/
  5. scripts/
  6. src/
  7. static/
  8. .clang-format
  9. .gitignore
  10. bmcweb.service.in
  11. bmcweb.socket
  12. build_x86.sh
  13. cmake-format.json
  14. CMakeLists.txt
  15. CMakeLists.txt.in
  16. config.h.in
  17. DEVELOPING.md
  18. JenkinsFile
  19. LICENCE
  20. MAINTAINERS
  21. pam-webserver
  22. README.md
  23. Redfish.md
README.md

OpenBMC webserver

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

Capabilities

At this time, the webserver implements a few interfaces:

  • Authentication middleware that supports cookie and token based authentication, as well as CSRF prevention backed by linux PAM authentication credentials.
  • An (incomplete) attempt at replicating phosphor-dbus-rest interfaces in C++. Right now, a few of the endpoint definitions work as expected, but there is still a lot of work to be done. The portions of the interface that are functional are designed to work correctly for phosphor-webui, but may not yet be complete.
  • Replication of the rest-dbus backend interfaces to allow bmc debug to logged in users.
  • An initial attempt at a read-only redfish interface. Currently the redfish interface targets ServiceRoot, SessionService, AccountService, Roles, and ManagersService. Some functionality here has been shimmed to make development possible. For example, there exists only a single user role.
  • SSL key generation at runtime. See the configuration section for details.
  • Static file hosting. Currently, static files are hosted from the fixed location at /usr/share/www. This is intended to allow loose coupling with yocto projects, and allow overriding static files at build time.
  • Dbus-monitor over websocket. A generic endpoint that allows UIs to open a websocket and register for notification of events to avoid polling in single page applications. (this interface may be modified in the future due to security concerns.

Configuration

BMCWeb is configured by setting -D flags that correspond to options in bmcweb/CMakeLists.txt and then compiling. For example, cmake -DBMCWEB_ENABLE_KVM=NO ... followed by make. The option names become C++ preprocessor symbols that control which code is compiled into the program.

When BMCWeb starts running, it reads persistent configuration data (such as UUID and session data) from a local file. If this is not usable, it generates a new configuration.

When BMCWeb SSL support is enabled and a usable certificate is not found, it will generate a self-sign a certificate before launching the server. The keys are generated by the secp384r1 algorithm. The certificate

  • is issued by C=US, O=OpenBMC, CN=testhost,
  • is valid for 10 years,
  • has a random serial number, and
  • is signed using the SHA-256 algorithm.