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ipasam: implement PASSDB getgrnam call

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ipasam already implemented retrieval of groups for MS-SAMR calls.
However, it did not have implementation of a group retrieval for the
path of lookup_name() function in Samba. The lookup_name() is used in
many places in smbd and winbindd.

With this change it will be possible to resolve IPA groups in Windows UI
(Security tab) and console (net localgroup ...). When Global Catalog
service is enabled, it will be possible to search for those groups as
well.

In Active Directory, security groups can be domain, domain local, local
and so on. In IPA, only domain groups exposed through ipasam because
SID generation plugin only supports adding SIDs to POSIX groups and
users. Thus, non-POSIX groups are not going to have SIDs associated and
will not be visible in both UNIX and Windows environments.

Group retrieval in Samba is implemented as a mapping between NT and
POSIX groups. IPA doesn't have explicit mapping tables. Instead, any
POSIX group in IPA that has a SID associated with it is considered a
domain group for Samba.

Finally, additional ACI is required to ensure attributes looked up by
ipasam are always readable by the trust agents.

Fixes: https://pagure.io/freeipa/issue/8660
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
This commit is contained in:
Alexander Bokovoy
2020-10-12 12:42:25 +03:00
committed by Rob Crittenden
parent 968f8ada65
commit e6f8d8bc9b
2 changed files with 151 additions and 0 deletions
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5
install/updates/60-trusts.update
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@@ -41,6 +41,11 @@ dn: $SUFFIX
add:aci: (targetattr = "ipaNTHash")(version 3.0; acl "Samba system principals can read and write NT passwords"; allow (read,write) groupdn="ldap:///cn=adtrust agents,cn=sysaccounts,cn=etc,$SUFFIX";)
remove:aci: (targetattr = "ipaNTHash")(version 3.0; acl "Samba system principals can read NT passwords"; allow (read) groupdn="ldap:///cn=adtrust agents,cn=sysaccounts,cn=etc,$SUFFIX";)
# Allow Samba to read POSIX information with an explicit ACI
dn: cn=accounts,$SUFFIX
add:aci: (targetattr = "cn || createtimestamp || description || displayname || entryusn || gecos || gidnumber || givenname || homedirectory || ipantsecurityidentifier || loginshell || modifytimestamp || objectclass || uid || uidnumber")(targetfilter = "(objectclass=posixaccount)")(version 3.0;acl "Allow reading POSIX information about users and group objects";allow (compare,read,search) groupdn = "ldap:///cn=adtrust agents,cn=sysaccounts,cn=etc,$SUFFIX";)
# For Samba as a domain member setup we need to allow synchronizing ipaNTHash value
dn: cn=services,cn=accounts,$SUFFIX
add:aci: (target="ldap:///krbprincipalname=cifs/($$dn),cn=services,cn=accounts,$SUFFIX")(targetattr="ipaNTHash")(version 3.0; acl "CIFS service can modify own ipaNTHash"; allow(write) userdn="ldap:///krbprincipalname=cifs/($$dn),cn=services,cn=accounts,$SUFFIX" or userattr="managedby#SELFDN";)