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214 Appendix B ACL Permissions and Group Memberships Using GUID
Now, two users can have identical long name, short name, UID, and GID, but will have
different GUIDs. Thus they can have different ACL permissions and can belong to
different groups. Since the GUID is a 128-bit value, duplicate GUIDs are extremely
unlikely.
As an administrator you must now make sure you can restore user accounts with GUIDs
intact. Restoring user accounts with UID, GID, and short name but no GUID will not
restore ACL permissions or group membership in Mac OS X version 10.4 or later.
ACLs Augment POSIX Permissions
An ACL is a list of access control entries (ACEs), each specifying permissions to be
granted or denied to a user or group for accessing a folder and its contents. An ACL
also specifies how its permissions propagate through a folder hierarchy. You can set
ACL permissions in addition to standard POSIX permissions.
Every file and folder always has POSIX permissions. Unless an administrator assigns ACL
permissions, the POSIX permissions continue to determine user access in a Mac OS X
v10.4 system. If you assign ACL permissions, they take precedence over the standard
POSIX permissions. For more information about ACL and POSIX permissions, review the
file services guide.
GUIDs and Groups
Mac OS X version 10.4 verifies group and nested group membership by checking
GUIDs. A group’s GUID is also used by file system ACLs and is stored on disk in the ACE.
The legacy user short name is used only if there’s no GUID present in the group record.
File Permissions and Synchronization
Having the same POSIX permissions for files synchronized between two computers
requires having the same UID on both machines. Having the same ACL permissions on
both computers requires matching GUIDs as well. This can be done using Workgroup
Manager or command-line directory editing tools, or simply by having both machines
share the same directory.
Portable Home Directories (PHDs) rely on a user having the same GUID in the local user
account on the user’s computer and in the network user account on an Open Directory
server. This ensures that file permissions are the same whether the user logs in using
the local user account (while disconnected from the network) or the network user
account.
For information about GUID implementation across directories refer to the Open
Directory admin guide.
- Mac OS X Server 1
- Contents 3
- Contents 7 7
- 8 Contents 8
- Contents 9 9
- 10 Contents 10
- Contents 11 11
- 12 Contents 12
- About This Guide 13
- What’s in This Guide 14
- Using Onscreen Help 15
- The Mac OS X Server Suite 15
- User Management Overview 19
- Server Admin 21
- Accounts 23
- Users and Managed Users 25
- Guest Users 25
- Computer Lists 26
- The User Experience 27
- Identity Validation 29
- Information Access Control 29
- Getting Started With 31
- User Management 31
- Analyzing Your Environment 37
- Using Client Management 38
- Using Mobile Accounts 39
- Portable Home Directories 39
- Identifying Groups 40
- Using Workgroup Manager 41
- Major Workgroup Manager Tasks 42
- Listing and Finding Accounts 43
- Refreshing Account Lists 45
- Sorting User and Group Lists 46
- Batch Editing 47
- Using Presets 47
- Creating a Mobile Account 51
- Removing a Mobile Account 51
- Managing Mobile Clients 53
- Using Wireless Services 55
- FileVault for Mobile Clients 56
- Setting Up User Accounts 57
- Predefined User Accounts 58
- Administering User Accounts 59
- Defining a Guest User 62
- Deleting a User Account 63
- Disabling a User Account 63
- Renaming Presets 65
- Changing Presets 65
- Deleting a Preset 65
- Defining Long User Names 66
- Defining Short User Names 66
- • a through z 67
- • A through Z 67
- • 0 through 9 67
- • _ (underscore) 67
- Choosing Stable Short Names 68
- Avoiding Duplicate Names 68
- Defining User IDs 71
- Defining Passwords 71
- Defining Login Settings 74
- Defining a Password Type 75
- Editing Comments 76
- Adding a User to Groups 78
- Removing a User From a Group 78
- Forwarding a User’s Mail 81
- Setting Up Group Accounts 85
- Creating Nested Groups 89
- Upgrading Legacy Groups 89
- Adding Users to a Group 90
- Removing Users From a Group 91
- Naming a Group 92
- Defining a Group ID 92
- Specifying No Group Folder 93
- Deleting a Group Account 99
- Setting Up Computer Lists 101
- Creating a Computer List 102
- Using a Computer List Preset 104
- Deleting a Computer List 106
- Managing Guest Computers 107
- Working With Access Settings 108
- Using Local User Accounts 110
- Setting Up Home Directories 111
- Home directories A through M 112
- Mac OS X Servers 112
- Home directories N through Z 112
- User accounts 112
- Specifying No Home Directory 113
- Home Directories 119
- Setting Disk Quotas 121
- Moving Home Directories 122
- Deleting Home Directories 122
- Client Management Overview 123
- Defining Preferences 125
- The Power of Preferences 126
- Levels of Control 127
- Degrees of Permanence 129
- Who Can Log In 131
- Caching Preferences 132
- Managing Preferences 135
- Managing User Preferences 138
- Managing Group Preferences 139
- Managing Computer Preferences 139
- Managing Classic Preferences 144
- Managing Dock Preferences 148
- Adding Items to a User’s Dock 150
- Managing Finder Preferences 155
- Managing Internet Preferences 162
- Managing Login Preferences 163
- Specifying How a User Logs In 164
- Login and Logout Scripts 169
- Managing Mobility Preferences 172
- Managing Network Preferences 172
- Managing Printing Preferences 173
- Setting a Default Printer 175
- Setting a Visual Alert 178
- Application 182
- Managing Network Views 185
- Editing Managed Network Views 187
- Computers 192
- • Disable the view 194
- • Delete the view 194
- Solving Problems 197
- Users Can’t Open Files 202
- Importing and Exporting 205
- Account Information 205
- Earlier 208
- Writing a Record Description 210
- ACL Permissions and Group 213
- Memberships Using GUID 213
- GUIDs and Groups 214
- Importing and Exporting Users 215
- Glossary 217
- 218 Glossary 218
- Glossary 219 219
- 220 Glossary 220
- Glossary 221 221
- 222 Glossary 222
- Glossary 223 223
- 224 Glossary 224
- Glossary 225 225
- 226 Glossary 226
- Glossary 227 227
- 228 Glossary 228
- 230 Index 230
- Index 231 231
- 232 Index 232
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