keytab: Add new extended operation to get a keytab.

This new extended operation allow to create new keys or retrieve
existing ones.
The new set of keys is returned as a ASN.1 structure similar to the one
that is passed in by the 'set keytab' extended operation.

Access to the operation is regulated through a new special ACI that
allows 'retrieval' only if the user has access to an attribute
named ipaProtectedOperation postfixed by the subtypes 'read_keys' and
'write_keys' to distinguish between creation and retrieval operation.

For example for allowing retrieval by a specific user the following ACI
is set on cn=accounts:

(targetattr="ipaProtectedOperation;read_keys") ...
 ... userattr=ipaAllowedToPerform;read_keys#USERDN)

This ACI matches only if the service object hosts a new attribute named
ipaAllowedToPerform that holds the DN of the user attempting the operation.

Resolves:
https://fedorahosted.org/freeipa/ticket/3859

3 files changed, 16 insertions, 0 deletions

diff --git a/install/share/60basev3.ldif b/install/share/60basev3.ldif
index 552045b63..ff148e97c 100644
--- a/install/share/60basev3.ldif
+++ b/install/share/60basev3.ldif
@@ -46,6 +46,8 @@ attributeTypes: (2.16.840.1.113730.3.8.11.46 NAME 'ipaPermLocation' DESC 'Locati
 attributeTypes: (2.16.840.1.113730.3.8.11.47 NAME 'ipaPermRight' DESC 'IPA permission rights' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 X-ORIGIN 'IPA v3' )
 attributeTypes: (2.16.840.1.113730.3.8.11.48 NAME 'ipaPermTargetFilter' DESC 'IPA permission target filter' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 X-ORIGIN 'IPA v3' )
 attributeTypes: (2.16.840.1.113730.3.8.11.49 NAME 'ipaPermTarget' DESC 'IPA permission target' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE X-ORIGIN 'IPA v3' )
+attributeTypes: (2.16.840.1.113730.3.8.11.51 NAME 'ipaAllowedToPerform' DESC 'DNs allowed to perform an operation' SUP distinguishedName X-ORIGIN 'IPA-v3')
+attributeTypes: (2.16.840.1.113730.3.8.11.52 NAME 'ipaProtectedOperation' DESC 'Operation to be protected' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15{128} )
 objectClasses: (2.16.840.1.113730.3.8.12.1 NAME 'ipaExternalGroup' SUP top STRUCTURAL MUST ( cn ) MAY ( ipaExternalMember $ memberOf $ description $ owner) X-ORIGIN 'IPA v3' )
 objectClasses: (2.16.840.1.113730.3.8.12.2 NAME 'ipaNTUserAttrs' SUP top AUXILIARY MUST ( ipaNTSecurityIdentifier ) MAY ( ipaNTHash $ ipaNTLogonScript $ ipaNTProfilePath $ ipaNTHomeDirectory $ ipaNTHomeDirectoryDrive ) X-ORIGIN 'IPA v3' )
 objectClasses: (2.16.840.1.113730.3.8.12.3 NAME 'ipaNTGroupAttrs' SUP top AUXILIARY MUST ( ipaNTSecurityIdentifier ) X-ORIGIN 'IPA v3' )
@@ -64,4 +66,5 @@ objectClasses: (2.16.840.1.113730.3.8.12.17 NAME 'ipaTrustedADDomainRange' SUP i
 objectClasses: (2.16.840.1.113730.3.8.12.19 NAME 'ipaUserAuthTypeClass' SUP top AUXILIARY DESC 'Class for authentication methods definition' MAY ipaUserAuthType X-ORIGIN 'IPA v3')
 objectClasses: (2.16.840.1.113730.3.8.12.20 NAME 'ipaUser' AUXILIARY MUST ( uid ) MAY ( userClass ) X-ORIGIN 'IPA v3' )
 objectClasses: (2.16.840.1.113730.3.8.12.21 NAME 'ipaPermissionV2' DESC 'IPA Permission objectclass, version 2' SUP ipaPermission AUXILIARY MUST ( ipaPermBindRuleType $ ipaPermLocation ) MAY ( ipaPermDefaultAttr $ ipaPermIncludedAttr $ ipaPermExcludedAttr $ ipaPermRight $ ipaPermTargetFilter $ ipaPermTarget ) X-ORIGIN 'IPA v3' )
+objectclasses: (2.16.840.1.113730.3.8.12.22 NAME 'ipaAllowedOperations' SUP top AUXILIARY DESC 'Class to apply access controls to arbitrary operations' MAY ( ipaAllowedToPerform $ ipaProtectedOperation ) X-ORIGIN 'IPA v3')
 objectClasses: (2.16.840.1.113730.3.8.12.23 NAME 'ipaVirtualOperation' DESC 'IPA Virtual operation objectclass' SUP top AUXILIARY MUST ( cn ) X-ORIGIN 'IPA v3' )
diff --git a/install/share/default-aci.ldif b/install/share/default-aci.ldif
index 04fc185f7..bc4b87652 100644
--- a/install/share/default-aci.ldif
+++ b/install/share/default-aci.ldif
@@ -26,6 +26,11 @@ changetype: modify
 add: aci
 aci: (targetattr = "krbMaxPwdLife || krbMinPwdLife || krbPwdMinDiffChars || krbPwdMinLength || krbPwdHistoryLength")(version 3.0;acl "Admins can write password policy"; allow (write) groupdn="ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)
 aci: (targetattr = "aci")(version 3.0;acl "Admins can manage delegations"; allow (write, delete) groupdn="ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)
+aci: (targetattr="ipaProtectedOperation;read_keys")(version 3.0; acl "Users allowed to retrieve keytab keys"; allow(read) userattr="ipaAllowedToPerform;read_keys#USERDN";)
+aci: (targetattr="ipaProtectedOperation;read_keys")(version 3.0; acl "Groups allowed to retrieve keytab keys"; allow(read) userattr="ipaAllowedToPerform;read_keys#GROUPDN";)
+aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Users allowed to create keytab keys"; allow(write) userattr="ipaAllowedToPerform;write_keys#USERDN";)
+aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Groups allowed to create keytab keys"; allow(write) userattr="ipaAllowedToPerform;write_keys#GROUPDN";)
+aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Entities are allowed to rekey themselves"; allow(write) userdn="ldap:///self";)
 
 dn: cn=services,cn=accounts,$SUFFIX
 changetype: modify
diff --git a/install/updates/20-aci.update b/install/updates/20-aci.update
index 6af800111..3a9206cf6 100644
--- a/install/updates/20-aci.update
+++ b/install/updates/20-aci.update
@@ -65,3 +65,11 @@ remove:aci: '(targetattr = "*")(version 3.0; acl "No anonymous access to hbac";
 
 dn: cn=sudo,$SUFFIX
 remove:aci: '(targetattr = "*")(version 3.0; acl "No anonymous access to sudo"; deny (read,search,compare) userdn != "ldap:///all";)'
+
+# Get Keytab operation Access Control
+dn: cn=accounts,$SUFFIX
+add:aci: (targetattr="ipaProtectedOperation;read_keys")(version 3.0; acl "Users allowed to retrieve keytab keys"; allow(read) userattr="ipaAllowedToPerform;read_keys#USERDN";)
+add:aci: (targetattr="ipaProtectedOperation;read_keys")(version 3.0; acl "Groups allowed to retrieve keytab keys"; allow(read) userattr="ipaAllowedToPerform;read_keys#GROUPDN";)
+add:aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Users allowed to create keytab keys"; allow(write) userattr="ipaAllowedToPerform;write_keys#USERDN";)
+add:aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Groups allowed to create keytab keys"; allow(write) userattr="ipaAllowedToPerform;write_keys#GROUPDN";)
+add:aci: (targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Entities are allowed to rekey themselves"; allow(write) userdn="ldap:///self";)