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

Reviewed-By: Nathaniel McCallum <npmccallum@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/install/updates/20-aci.update b/install/updates/20-aci.update
index 4eb5c737a..76179bfb6 100644
--- a/install/updates/20-aci.update
+++ b/install/updates/20-aci.update
@@ -43,7 +43,8 @@ remove:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword |
 remove:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbUPEnabled || krbTicketPolicyReference || krbPrincipalExpiration || krbPasswordExpiration || krbPwdPolicyReference || krbPrincipalType || krbPwdHistory || krbLastPwdChange || krbPrincipalAliases || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || krbTicketFlags || ipaUniqueId || memberOf || serverHostName || enrolledBy || ipaNTHash")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
 remove:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbUPEnabled || krbTicketPolicyReference || krbPrincipalExpiration || krbPasswordExpiration || krbPwdPolicyReference || krbPrincipalType || krbPwdHistory || krbLastPwdChange || krbPrincipalAliases || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || ipaUniqueId || memberOf || serverHostName || enrolledBy || ipaNTHash")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
 remove:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbUPEnabled || krbTicketPolicyReference || krbPasswordExpiration || krbPwdPolicyReference || krbPrincipalType || krbPwdHistory || krbLastPwdChange || krbPrincipalAliases || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || ipaUniqueId || memberOf || serverHostName || enrolledBy || ipaNTHash")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
-add:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbPasswordExpiration || krbPwdHistory || krbLastPwdChange || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || ipaUniqueId || memberOf || enrolledBy || ipaNTHash")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
+remove:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbPasswordExpiration || krbPwdHistory || krbLastPwdChange || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || ipaUniqueId || memberOf || enrolledBy || ipaNTHash")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
+add:aci:'(targetattr != "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || krbMKey || krbPrincipalName || krbCanonicalName || krbPasswordExpiration || krbPwdHistory || krbLastPwdChange || krbExtraData || krbLastSuccessfulAuth || krbLastFailedAuth || krbLoginFailedCount || ipaUniqueId || memberOf || enrolledBy || ipaNTHash || ipaProtectedOperation")(version 3.0; acl "Admin can manage any entry"; allow (all) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
 # Write-only
 remove:aci:'(targetattr = "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory")(version 3.0; acl "Admins can write passwords"; allow (add,delete,write) groupdn="ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
 add:aci:'(targetattr = "userPassword || krbPrincipalKey || sambaLMPassword || sambaNTPassword || passwordHistory || ipaNTHash")(version 3.0; acl "Admins can write passwords"; allow (add,delete,write) groupdn="ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
@@ -69,3 +70,13 @@ 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";)'
+add:aci: '(targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Admins are allowed to rekey any entity"; allow(write) groupdn = "ldap:///cn=admins,cn=groups,cn=accounts,$SUFFIX";)'
+add:aci: '(targetfilter="(|(objectclass=ipaHost)(objectclass=ipaService))")(targetattr="ipaProtectedOperation;write_keys")(version 3.0; acl "Entities are allowed to rekey managed entries"; allow(write) userattr="managedby#USERDN";)'