Operations in FIPS mode make impossible use of NTLMSSP when
authenticating to trusted Active Directory domain controllers because
RC4 cipher is not allowed. Instead, Kerberos authentication have to be
used. We switched to enforce Kerberos authentication when communicating
with trusted domains' domain controllers everywhere.
Kerberos library uses system wide configuration which in IPA defaults to
resolving location of KDCs via DNS SRV records. Once trust is
established, SSSD will populate a list of closest DCs and provide them
through the KDC locator plugin. But at the time the trust is established
performing DNS SRV-based discovery of Kerberos KDCs might fail due to
multiple reasons. It might also succeed but point to a DC that doesn't
know about the account we have to use to establish trust.
One edge case is when DNS SRV record points to an unreachable DC,
whether due to a firewall or a network topology limitations. In such
case an administrator would pass --server <server> option to
'ipa trust-add' or 'ipa trust-fetch-domains' commands.
'ipa trust-fetch-domains' runs a helper via oddjobd. This helper was
already modified to support --server option and generated custom
krb5.conf overlay to pin to a specific AD DC. However, this
configuration was removed as soon as we finished talking to AD DCs.
With switch to always use Kebreros to authenticate in retrieval of the
topology information, we have to use the overlay everywhere as well.
Convert the code that generated the overlay file into a context that
generates the overlay and sets environment. Reuse it in other
trust-related places where this matters.
Oddjob helper runs as root and can write to /run/ipa for the krb5.conf
overlay.
Server side of 'ipa trust-add' code calls into ipaserver/dcerpc.py and
runs under ipaapi so can only write to /tmp. Since it is a part of the
Apache instance, it uses private /tmp mounted on tmpfs.
Fixes: https://pagure.io/freeipa/issue/8664
Related: https://pagure.io/freeipa/issue/8655
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
winbindd expects forest topology information blob to find out child
domains. We should store it in LDAP and let ipasam to retrieve it.
In fact, ipasam already supports updating and loading this information
but during 'ipa trust-fetch-domains' we didn't provide it.
Make sure the blob is preserved after it was retrieved and also updated
when we fetch forest topology information.
Fixes: https://pagure.io/freeipa/issue/8576
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
In order to simplify the build process between upstream FreeIPA
and downstream builds (such as CentOS Stream) we are changing
some file references from FreeIPA to IPA (and Identity Management).
https://pagure.io/freeipa/issue/8669
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
We want to always use SMB encryption if it is possible on LSA pipe as we
are going to pass what accounts to a plain-text content within
CreateTrustedDomainEx2 call.
The catch is that older Samba version might not have a way to enforce
this and we need fall back to work with existing connection then.
Fixes: https://pagure.io/freeipa/issue/8655
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
In FIPS mode we cannot rely on NTLMSSP at all, so we have ensure
Kerberos is used by Samba Python libraries. This is achieved by
requiring credentials objects to always use Kerberos authentication.
Additionally, we have to normalize the principal used to authenticate.
In case it was passed without realm, add forest root domain as a realm.
In case it was passed with NetBIOS domain name, remove it and replace
with a realm. Since we only know about the forest root domain as a
realm, require that for other domains' users a real Kerberos principal
is specified.
Fixes: https://pagure.io/freeipa/issue/8655
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
When establishing trust to Active Directory forest, RC4 is used to
encrypt trusted domain object credentials as an application-specific
material in a secure channel based on AES session key.
In FIPS mode it is not possible to use RC4 directly.
Samba 4.14 and backports to 4.13 in Fedora 33+ and RHEL 8.4+ now
provide a helper that wraps LSA RPC call CreateTrustedDomainEx2.
This helper ensures that in FIPS mode we first check that LSA session
key is AES before allowing RC4 use internally in Samba bindings. Thus,
it becomes possible to establish trust to Active Directory forest in
FIPS mode.
Adopt FreeIPA code to use the helper provided by Samba when it is
available. If neither the helper nor unprotected arcfour_encrypt utility
is available from Samba bindings, fail import of the ipaserver.dcerpc
module.
Fixes: https://pagure.io/freeipa/issue/8655
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
FreeIPA's Python and C code used different approaches to get the FQDN of
the host. Some places assumed that gethostname() returns a FQDN. Other
code paths used glibc's resolver to resolve the current node name to a
FQDN.
Python code now uses the ipalib.constants.FQDN where a fully qualified
domain name is expected. The variable is initialized only once and avoids
potential DNS lookups.
C code uses a new helper function ipa_gethostfqdn() in util package. The
function implements similar logic as gethostfqdn() except it uses more
modern getaddrinfo(). The result is cached as well.
Fixes: https://pagure.io/freeipa/issue/8501
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>
The purpose of external groups in FreeIPA is to be able to reference
objects only existing in trusted domains. These members get resolved
through SSSD interfaces but there is nothing that prevents SSSD from
resolving any IPA user or group if they have security identifiers
associated.
Enforce a check that a SID returned by SSSD does not belong to IPA
domain and raise a validation error if this is the case. This would
prevent adding IPA users or groups as external members of an external
group.
RN: Command 'ipa group-add-member' allowed to specify any user or group
RN: for '--external' option. A stricter check is added to verify that
RN: a group or user to be added as an external member does not come
RN: from IPA domain.
Fixes: https://pagure.io/freeipa/issue/8236
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
DomainValidator.get_trusted_domain_object_from_sid() was using
escape_filter_chars() with bytes. The function only works with text.
This caused idview to fail under some circumstances. Reimplement
backslash hex quoting for bytes.
Fixes: https://pagure.io/freeipa/issue/7958
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
This patche removes 93 pylint deprecation warnings due to invalid escape
sequences (mostly 'invalid escape sequence \d') on unicode strings.
Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
This patche removes 93 pylint deprecation warnings due to invalid escape
sequences (mostly 'invalid escape sequence \d') on unicode strings.
Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Replace get_ldap_uri() + LDAPClient() with new LDAPClient constructors
like LDAPClient.from_realm().
Some places now use LDAPI with external bind instead of LDAP with simple
bind. Although the FQDN *should* resolve to 127.0.0.1 / [::1], there is
no hard guarantee. The draft
https://tools.ietf.org/html/draft-west-let-localhost-be-localhost-04#section-5.1
specifies that applications must verify that the resulting IP is a
loopback API. LDAPI is always local and a bit more efficient, too.
The simple_bind() method also prevents the caller from sending a
password over an insecure line.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
When looking through the topology of a trusted forest, we should support
all types of forest trust records. Since Samba Python bindings parse the
data into a typed structure, a type of the record has to be taken into
account or there will be type mismatch when accessing elements of the
union:
typedef [switch_type(lsa_ForestTrustRecordType)] union {
[case(LSA_FOREST_TRUST_TOP_LEVEL_NAME)] lsa_StringLarge top_level_name;
[case(LSA_FOREST_TRUST_TOP_LEVEL_NAME_EX)] lsa_StringLarge top_level_name_ex;
[case(LSA_FOREST_TRUST_DOMAIN_INFO)] lsa_ForestTrustDomainInfo domain_info;
[default] lsa_ForestTrustBinaryData data;
} lsa_ForestTrustData;
typedef struct {
lsa_ForestTrustRecordFlags flags;
lsa_ForestTrustRecordType type;
NTTIME_hyper time;
[switch_is(type)] lsa_ForestTrustData forest_trust_data;
} lsa_ForestTrustRecord;
typedef [public] struct {
[range(0,4000)] uint32 count;
[size_is(count)] lsa_ForestTrustRecord **entries;
} lsa_ForestTrustInformation;
Each entry in the lsa_ForestTrustInformation has forest_trust_data
member but its content depends on the value of a type member
(forest_trust_data is a union of all possible structures).
Previously we assumed only TLN or TLN exclusion record which were
of the same type (lsa_StringLarge). Access to forest_trust_data.string
fails when forest_trust_data's type is lsa_ForestTrustDomainInfo as it
has no string member.
Fix the code by properly accessing the dns_domain_name from the
lsa_ForestTrustDomainInfo structure.
Fixes: https://pagure.io/freeipa/issue/7828
Reviewed-By: Christian Heimes <cheimes@redhat.com>
pylint 2.2.0 has a new checker for unnecessary pass statements. There is
no need to have a pass statement in functions or classes with a doc
string.
Fixes: https://pagure.io/freeipa/issue/7772
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Thomas Woerner <twoerner@redhat.com>
Python 2 had old style and new style classes. Python 3 has only new
style classes. There is no point to subclass from object any more.
See: https://pagure.io/freeipa/issue/7715
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Fix the following violations aiming to support Pylint 2.0
- `unneeded-not` (C0113):
Consider changing "not item in items" to "item not in items" used
when a boolean expression contains an unneeded negation.
- `useless-import-alias` (C0414):
Import alias does not rename original package Used when an import
alias is same as original package.e.g using import numpy as numpy
instead of import numpy as np
- `raising-format-tuple` (W0715):
Exception arguments suggest string formatting might be intended Used
when passing multiple arguments to an exception constructor, the
first of them a string literal containing what appears to be
placeholders intended for formatting
- `bad-continuation` (C0330):
This was already included on the disable list, although with current
version of pylint (2.0.0.dev2) violations at the end of the files
are not being ignored.
See: https://github.com/PyCQA/pylint/issues/2278
- `try-except-raise` (E0705):
The except handler raises immediately Used when an except handler
uses raise as its first or only operator. This is useless because it
raises back the exception immediately. Remove the raise operator or
the entire try-except-raise block!
- `consider-using-set-comprehension` (R1718):
Consider using a set comprehension Although there is nothing
syntactically wrong with this code, it is hard to read and can be
simplified to a set comprehension.Also it is faster since you don't
need to create another transient list
- `dict-keys-not-iterating` (W1655):
dict.keys referenced when not iterating Used when dict.keys is
referenced in a non-iterating context (returns an iterator in
Python 3)
- `comprehension-escape` (W1662):
Using a variable that was bound inside a comprehension Emitted when
using a variable, that was bound in a comprehension handler, outside
of the comprehension itself. On Python 3 these variables will be
deleted outside of the comprehension.
Issue: https://pagure.io/freeipa/issue/7614
Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Aiming to support pylint 2.0 some functions and methods must have their
return statements updated in order to fix two new violations:
- `useless-return` (R1711):
Useless return at end of function or method Emitted when a single
"return" or "return None" statement is found at the end of function
or method definition. This statement can safely be removed because
Python will implicitly return None
- `inconsistent-return-statements` (R1710):
Either all return statements in a function should return an
expression, or none of them should. According to PEP8, if any return
statement returns an expression, any return statements where no value
is returned should explicitly state this as return None, and an
explicit return statement should be present at the end of the
function (if reachable)
Issue: https://pagure.io/freeipa/issue/7614
Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
When AD forest A has a trust with a forest B that claims ownership
of a domain name (TLN) owned by an IPA forest, we need to build
exclusion record for that specific TLN, not our domain name.
Use realmdomains to find a correct exclusion entry to build.
Fixes: https://pagure.io/freeipa/issue/7370
Reviewed-By: Armando Neto <abiagion@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Translation objects have support for format(). This allows to
get rid of unicode() which is deprecated in Python3.
Fixes: https://pagure.io/freeipa/issue/7586
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
On multiple occasions, SRV query answers were not properly sorted by
priority. Records with same priority weren't randomized and shuffled.
This caused FreeIPA to contact the same remote peer instead of
distributing the load across all available servers.
Two new helper functions now take care of SRV queries. sort_prio_weight()
sorts SRV and URI records. query_srv() combines SRV lookup with
sort_prio_weight().
Fixes: https://pagure.io/freeipa/issue/7475
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
LDAP connections no longer depend on sane settings in global ldap.conf
and use good default settings for cert validation, CA, and SASL canonization.
https://pagure.io/freeipa/issue/7418
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Add absolute_import from __future__ so that pylint
does not fail and to achieve python3 behavior in
python2.
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Replace all ldap.initialize() calls with a helper function
ldap_initialize(). It handles cacert and cert validation correctly. It
also provides a unique place to handle python-ldap 3.0 bytes warnings in
the future.
Fixes: https://pagure.io/freeipa/issue/7411
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Quite often users choose wrong type of trust on Active Directory side
when setting up a trust to freeIPA. The trust type supported by freeIPA
is just a normal forest trust to another Active Directory. However,
some people follow old internet recipes that force using a trust to MIT
Kerberos realm.
This is a wrong type of trust. Unfortunately, when someone used MIT
Kerberos realm trust, there is no way to programmatically remote the
trust from freeIPA side. As result, we have to detect such situation and
report an error.
To do proper reporting, we need reuse some constants and trust type
names we use in IPA CLI/Web UI. These common components were moved to
a separate ipaserver/dcerpc_common.py module that is imported by both
ipaserver/plugins/trust.py and ipaserver/dcerpc.py.
Fixes https://pagure.io/freeipa/issue/7264
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>
Replace python3-pyldap with python3-ldap.
Remove some old code for compatibility with very old python-ldap.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
When definining a topology of a forest to be visible over a cross-forest
trust, we set *.<forest name> as all-catch top level name already.
This means that all DNS subdomains of the forest will already be matched
by this top level name (TLN). If we add more TLNs for subdomains, Active
Directory will respond with NT_STATUS_INVALID_PARAMETER.
Filter out all subdomains of the forest root domain. All other realm
domains will be added with explicit TLN records.
Also filter out single label domains. These aren't possible to add as
TLNs to Windows Server 2016 as it considers them incorrect. Given that
we do not allow single lable domains as part of freeIPA installs, this
is another layer of protection here.
Fixes https://pagure.io/freeipa/issue/6666
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Disable unbalanced-tuple-unpacking for RuntimeException thrown
by samba since this one should always contain two members.
https://pagure.io/freeipa/issue/6874
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
assess_dcerpc_exception was used in multiple places with a pre-step
which was rather common. Move this to one spot.
This also fixes pylint warning about unbalanced unpacking.
https://pagure.io/freeipa/issue/6874
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Make 'ipa trust-add' work under Python 3. One needs patches from
https://lists.samba.org/archive/samba-technical/2017-July/121746.html
to Samba too.
Since we haven't switched whole ipa server environment to Python 3 yet,
following packages need to be installed to make trust code working under
Python 3:
- python3-libsss_nss_idmap
- python3-sss
- python3-samba
- python3-mod_wsgi
Fixes: https://pagure.io/freeipa/issue/4985
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
Remove logger arguments in all functions and logger attributes in all
objects, with the exception of API object logger, which is now deprecated.
Replace affected logger calls with module-level logger calls.
Reviewed-By: Martin Basti <mbasti@redhat.com>
Samba error code reporting changes from version to version but we also
did not provide proper input into DCE RPC error processing method we
have.
Unify error processing and add few more fallback entries.
With Samba 4.7 we'll have to change it again because error code
processing for Samba Python modules will change with introduction of
samba.ntstatus and samba.werror modules.
Note that this commit also changes a message returned for error code
-1073741772 (NT_STATUS_OBJECT_NOT_FOUND) because it is more general one.
Fixes https://pagure.io/freeipa/issue/6859
Reviewed-By: Martin Basti <mbasti@redhat.com>
Samba Python bindings provide samba.arcfour_encrypt(key, data). Instead
of implementing own wrapper, use Samba's.
In future Samba versions this wrapper will be FIPS 140-2 compatible.
Fixes https://pagure.io/freeipa/issue/6697
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
The framework will not have direct access to the keytab anymore.
This function was used in two places, to fetch the domain list and to
re-initialize the PAC when enabling or disabling a domain trust.
The domian list is normally fetched via oddjob anyway so this use is
not necesary anymore, and the MS-PAC re-initialization can be moved
later to oddjob if needed.
https://fedorahosted.org/freeipa/ticket/5959
Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
We do not want to generate runtime directories just because the packages
are installed, but only if the server is actually setup and run. Also this
will be needed later because we will create a user at install time and some
tmpfiles will need to be owned by this user.
As we are changing this code also rationalize the directory structure and
move it from the http rundir to the ipa specific rundir.
https://fedorahosted.org/freeipa/ticket/5959
Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
SHARE_DIR and PLUGIN_SHARE_DIR depend on ipaplatform.
Replace all uses of SHARE_DIR with paths.USR_SHARE_IPA_DIR and remove
both SHARE_DIR and PLUGIN_SHARE_DIR.
https://fedorahosted.org/freeipa/ticket/6474
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
Python 3 Samba bindings are not available yet. Let's silence the
warnings to make pylint pass under Python 3.
https://fedorahosted.org/freeipa/ticket/4985
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>
* move IPAdmin methods to LDAPClient
* add extra arguments (cacert, sasl_nocanon) to LDAPClient.__init__()
* add host, port, _protocol to LDAPClient (parsed from ldap_uri)
* create get_ldap_uri() method to create ldap_uri from former
IPAdmin.__init__() arguments
* replace IPAdmin with LDAPClient + get_ldap_uri()
* remove ununsed function argument hostname from
enable_replication_version_checking()
https://fedorahosted.org/freeipa/ticket/6461
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
* Rename do_sasl_gssapi_bind to gssapi_bind
https://fedorahosted.org/freeipa/ticket/6461
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Check for import errors with pylint to make sure new python package
dependencies are not overlooked.
https://fedorahosted.org/freeipa/ticket/6418
Reviewed-By: Petr Spacek <pspacek@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>
The original approach with __path__ implemented
by 8f98fa1bd5 broke Pylint:
We decided to resort back to symlinks as it is easiest solution
which does not break pylint in weird ways.
This commit introduces configure --with-ipaplatform option.
https://fedorahosted.org/freeipa/ticket/6418
Reviewed-By: Lukas Slebodnik <lslebodn@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Unused variables may:
* make code less readable
* create dead code
* potentialy hide issues/errors
Enabled check should prevent to leave unused variable in code
Check is locally disabled for modules that fix is not clear or easy or have too many occurences of
unused variables
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
This allows for re-use of this method in cases where the caller can not or
wishes not to instantiate local Samba domain to retrieve information about
remote ones.
https://fedorahosted.org/freeipa/ticket/6057
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
