redhat_subscription: use D-Bus registration on RHEL 7 only on 7.4+ (#7624)
subscription-manager does not provide a D-Bus interface in versions of
RHEL 7 older than 7.4.
(cherry picked from commit af01b462d5)
Co-authored-by: Pino Toscano <ptoscano@redhat.com>
redhat_subscription: refactor of internal Rhsm class (#6658)
The two RegistrationBase & Rhsm classes were copied from the ones in the
shared module_utils.redhat module; that said:
- the versions here got improvements over the years
- the RegistrationBase in module_utils.redhat is used only by the RHN
modules, which are deprecated and slated for removal
Hence, the classes here can be kept and simplified a bit:
- fold the non-dummy content of RegistrationBase into Rhsm: there is no
more need for the separate RegistrationBase base class
- drop the init arguments "username", "password", and "token": the
instance variables of them are not used anywhere, as the needed
credentials (together with other variables) are passed to the
register() method
- create the Rhsm object later in main(), after the AnsibleModule
creation and the uid check: this avoids the creation of Rhsm with a
null module variable, changing it later
There should be no behaviour change.
(cherry picked from commit 42f7531f21)
Co-authored-by: Pino Toscano <ptoscano@redhat.com>
The module currently has a static 'required_if' statement for its
parameters that forces any of 'username' or 'activationkey' or 'token'
in case state=present; while this is generally a good idea, it can be
an extra requirements in some cases. In particular, if the system is
already registered, there is no need for credentials -- some of the
operations of the module, such as manipulating pools, can be done
perfectly without credentials.
Hence:
- change the static 'required_if' to require credentials only when
forcing the registration
- check for credentials manually when a registration is needed, i.e.
on an unregistered system; the fail message is the same as the one
shown by 'required_if'
Adapt the tests to this new situation:
- test_without_required_parameters now needs to mock an unregistered
system
- add a new version of test_without_required_parameters to test an
already registered system
- add a simple test case for only state=present usable on an already
registered system
- remove the credentials from a test case for pool attachment that
mocks an already registered system
subscription-manager on RHEL installs a symlink in /usr/bin to
console-helper (part of usermode), which triggers an interactive prompt
for root credentials when run as user. It seems that console-helper
does not handle well non-interactive contexts (e.g. without a TTY for
input), and thus it will hang waiting for input when run as user in an
Ansible task.
Since subscription-manager requires root already anyway (and it will
fail when explicitly run as user), then apply the same logic locally on
all the modules that interact with it: redhat_subscription,
rhsm_release, and rhsm_repository.
subscription-manager currently does not have a way to get credentials
(username, password, activation keys, organization ID) in a secure way:
the existing command line parameters can be easily spotted when running
a process listing while 'subscription-manager register' runs.
There is a D-Bus service, which is used by e.g. cockpit and Anaconda to
interface with RHSM (at least for registration and common queries).
Try to perform the registration using D-Bus, in a way very similar to
the work done in convert2rhel [1] (with my help):
- try to do a simple signal test to check whether the system bus works;
inspired by the login in the dconf module
- pass most of the options as registration options; for the few that are
not part of the registration, execute 'subscription-manager' manually
- add quirks for differently working (or not) registration options for
the D-Bus Register*() methods depending on the version of RHEL
- 'subscription-manager register' is used only in case the signal test
is not working; silent fallback in case of D-Bus errors during the
registration is not done on purpose to avoid silent fallback to a less
secure registration
[1] https://github.com/oamg/convert2rhel/pull/540/
Add the `server_proxy_scheme` parameter to configure the scheme used for
the proxy server. This completes the configuration parameters for the
proxy server.
Stop passing all the "rhsm_", and "server_" module arguments to
"Rhsm.register()", and thus as arguments for
"subscription-manager register":
- right before calling "Rhsm.register()", "Rhsm.configure()" is called
to configure subscription-manager with all the "rhsm_", and "server_"
arguments; hence, they are already configured
- the passed argument to "--serverurl" is partially wrong:
"Rhsm.register()" passes only the hostname, whereas the other bits
(port and prefix) are supported too; this "works" because port and
prefix were already configured previously, and the lax parsing that
subscription-manager does allows for missing bits
- the parsing done by subscription-manager for "--baseurl" strips out
the URL scheme and always uses https: this means that specifying
"rhsm_baseurl: http://server" as module parameter will be taken as
"https://server" by subscription-manager; since "rhsm_baseurl" is
already configured by "Rhsm.configure()", this issue is gone
