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Add knob to limit hostname length

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On Linux systems the length limit for hostnames is hardcoded
at 64 in MAXHOSTNAMELEN

Solaris, for example, allows 255 characters, and DNS allows the
total length to be up to 255 (with each label < 64).

Add a knob to allow configuring the maximum hostname length (FQDN)

The same validators are used between hosts and DNS to apply
the knob only when dealing with a FQDN as a hostname.

The maxlen option is included so installers can limit the length
of allowed hostnames when the --hostname option is used.

https://pagure.io/freeipa/issue/2018

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
This commit is contained in:
Rob Crittenden
2019-05-01 10:15:37 -04:00
parent 7fe10d9903
commit 6662e99e17
12 changed files with 79 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
install/share/60ipaconfig.ldif
View File

@@ -43,11 +43,13 @@ attributeTypes: ( 2.16.840.1.113730.3.8.3.23 NAME 'ipaCertificateSubjectBase' SY
attributeTypes: (2.16.840.1.113730.3.8.3.16 NAME 'ipaConfigString' DESC 'Generic configuration stirng' EQUALITY caseIgnoreMatch ORDERING caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 X-ORIGIN 'IPA v2' )
attributeTypes: ( 2.16.840.1.113730.3.8.3.26 NAME 'ipaSELinuxUserMapDefault' DESC 'Default SELinux user' EQUALITY caseIgnoreMatch ORDERING caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE X-ORIGIN 'IPA v3')
attributeTypes: ( 2.16.840.1.113730.3.8.3.27 NAME 'ipaSELinuxUserMapOrder' DESC 'Available SELinux user context ordering' EQUALITY caseIgnoreMatch ORDERING caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE X-ORIGIN 'IPA v3')
## ipaMaxHostnameLength - maximum hostname length to allow
attributeTypes: ( 2.16.840.1.113730.3.8.1.28 NAME 'ipaMaxHostnameLength' EQUALITY integerMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE)
###############################################
##
## ObjectClasses
##
## ipaGuiConfig - GUI config parameters objectclass
objectClasses: ( 2.16.840.1.113730.3.8.2.1 NAME 'ipaGuiConfig' AUXILIARY MAY ( ipaUserSearchFields $ ipaGroupSearchFields $ ipaSearchTimeLimit $ ipaSearchRecordsLimit $ ipaCustomFields $ ipaHomesRootDir $ ipaDefaultLoginShell $ ipaDefaultPrimaryGroup $ ipaMaxUsernameLength $ ipaPwdExpAdvNotify $ ipaUserObjectClasses $ ipaGroupObjectClasses $ ipaDefaultEmailDomain $ ipaMigrationEnabled $ ipaCertificateSubjectBase $ ipaSELinuxUserMapDefault $ ipaSELinuxUserMapOrder $ ipaKrbAuthzData ) )
objectClasses: ( 2.16.840.1.113730.3.8.2.1 NAME 'ipaGuiConfig' AUXILIARY MAY ( ipaUserSearchFields $ ipaGroupSearchFields $ ipaSearchTimeLimit $ ipaSearchRecordsLimit $ ipaCustomFields $ ipaHomesRootDir $ ipaDefaultLoginShell $ ipaDefaultPrimaryGroup $ ipaMaxUsernameLength $ ipaPwdExpAdvNotify $ ipaUserObjectClasses $ ipaGroupObjectClasses $ ipaDefaultEmailDomain $ ipaMigrationEnabled $ ipaCertificateSubjectBase $ ipaSELinuxUserMapDefault $ ipaSELinuxUserMapOrder $ ipaKrbAuthzData $ ipaMaxHostnameLength) )
## ipaConfigObject - Generic config strings object holder
objectClasses: (2.16.840.1.113730.3.8.4.13 NAME 'ipaConfigObject' DESC 'generic config object for IPA' AUXILIARY MAY ( ipaConfigString ) X-ORIGIN 'IPA v2' )

1
install/share/bootstrap-template.ldif
View File

@@ -405,6 +405,7 @@ ipaHomesRootDir: /home
ipaDefaultLoginShell: /bin/sh
ipaDefaultPrimaryGroup: ipausers
ipaMaxUsernameLength: 32
ipaMaxHostnameLength: 64
ipaPwdExpAdvNotify: 4
ipaGroupObjectClasses: top
ipaGroupObjectClasses: groupofnames

1
install/updates/50-ipaconfig.update
View File

@@ -5,3 +5,4 @@ add:ipaUserObjectClasses: ipasshuser
remove:ipaConfigString:AllowLMhash
add:objectClass: ipaUserAuthTypeClass
add:objectClass: ipaNameResolutionData
addifnew:ipamaxhostnamelength: 64