write down account setup
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@@ -14,17 +14,26 @@ prefix or suffix:
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- Normal accounts. No prefix or suffix. Older accounts are just last
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names, newer accounts are LASTNAME_X, where X is the first letter of
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the given name.
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- Global accounts. These have a `gac-` prefix. There are only a
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handful of these on Linux so far, due to concerns about the lack of
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login restrictions.
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- Global accounts (or gac-accounts). These have a `gac-` prefix. These are shared accounts where several people know the password. Note that some global accounts were originially experiment accounts and share the properties of experiment accounts
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- Administrator accounts. Marked with an `-adm` suffix.
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- External users. These start with an `ext-` prefix and are provided
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to external users, ie. those who are not PSI employees.
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- Service accounts. These come with an `svcusr-` prefix and are used
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for running services.
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- Experiment accounts (or e-accounts). These start with `e` followed by the uid (+ some global accounts which where renamed later).
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These are managed by the [Digital User Office (DUO)](https://duo.psi.ch).
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The password is shared by all users involved in the experiment.
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- Service accounts. These come with an `svcusr-` prefix and are used for running services.
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Official documentation on PSI IT account naming convention can be found [here](https://psi.service-now.com/psisp?sys_kb_id=c498a3cb1bff68502c5940498b4bcb44&id=kb_article_view&sysparm_rank=1&sysparm_tsqueryId=4877d78687cc1d10bc150d830cbb3540)
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To be able to easily distinguish between the different account types, a user shall be assigned to
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| Unix Group | Accont Type |
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|--------------------|-------------|
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| `unx-lx_users` | normal user and administrator acccounts |
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| `unx-lx_gac_users` | global accounts |
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| `unx-lx_ext_users` | external accounts |
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| `unx-lx_e_users` | experiment accounts |
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## UID Allocation
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| UID | GID | |
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@@ -32,17 +41,19 @@ Official documentation on PSI IT account naming convention can be found [here](h
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| 0 - 1000 | 100 - 1000 | local users / groups manually |
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| 1000 - 9999 | 110 - 9999 | old AD accounts manually |
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| 10000 - 29999 | 10000 - 29999 | e-accounts / p-groups Experiment prov. tool |
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| 30000 - 65534 | 30000 - 65534 | new AD users / groups /external AD accounts OM msSFU30UidNumber |
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| 30000 - 65534 | 30000 - 65534 | new AD users / groups /external AD accounts OM |
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| 70000 - 120000 | 70000 - 120000 | e-accounts / p-groups Experiment prov. tool |
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| 123458 - 150000 | -10000 - -4294967296 | local AFS users / groups AFS |
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| 200000 - 400000 | 200000 - 400000 | new AD users / groups /external AD accounts IAM msSFU30UidNumber |
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| 200000 - 400000 | 200000 - 400000 | new AD users / groups /external AD accounts IAM |
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| 2000000000 - 4294967296 | 2000000000 - 4294967296 | sub UID / GID for containers local Linux systems / local Windows subsystems for Linux |
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## LDAP Attribute Mapping
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## AD Attribute Mapping
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| Attribute | LDAP Attribute |
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For the [sssd-ldap(5)](https://man.archlinux.org/man/sssd-ldap.5.en) provider following mapping is used
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| passwd attribute | AD attribute |
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|-----------|------------------------|
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| username | `msSFU30Name` |
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| UID | `msSFU30UidNumber` |
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@@ -50,15 +61,38 @@ Official documentation on PSI IT account naming convention can be found [here](h
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| home | `msSFU30HomeDirectory` |
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| shell | `msSFU30LoginShell` |
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We are on the process to move to the [sssd-ad(5)](https://man.archlinux.org/man/sssd-ad.5.en) provider. There we need following attributes:
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| passwd attribute | AD attribute |
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|-----------|---------------------|
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| username | `sAMAccountName` |
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| UID | `uidNumber` |
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| GID | `gidNumber` |
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| home | `unixHomeDirectory` |
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| gecos | `gecos` |
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Note that the `loginShell` attribute for the shell shall not be set as we only want to support Bash as login shell in the future.
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Finally the [gecos field](https://en.wikipedia.org/wiki/Gecos_field) shall be generated from other already existing AD attributes:
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<displayName>,<physicalDeliveryOfficeName>,<telephoneNumber>,,<mail>
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example:
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```
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Konrad Bucheli,OBBA/230,telephoneNumber,,konrad.bucheli@psi.ch
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```
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Note the field 4 (home/mobile number) we do not set, thus we have an empty field with two commas in a row.
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## Primary Groups
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By default the user group is `unx-nogroup`. The exception are experiment accounts, where the primary group is the corresponding g-group.
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If there are good reasons (example?) another primary group might be set.
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Except for the default `unx-nogroup`, a user shall always also be explicit member of his primary group (e.g. member of the g-group for experiment accounts).
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At PSI the user-private group scheme (UPG), the default on Red Hat
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distributions, is **not** used. Instead, every user\'s primary group is
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usually one specific to the group/department the user is working for,
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eg. `unx-ait`.
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Users for whom there is no natural choice of primary group are assigned
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`unx-nogroup`.
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distributions, is **not** used.
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## Low GIDs
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@@ -95,12 +129,6 @@ A number of groups have very low GIDs (\<500), in particular:
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unx-dtp:*:451:
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unx-lsu:*:490:
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## Shells
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We support bash, and we also try to keep tcsh working.
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Currently bash, tcsh, and sh are used. The form for ordering accounts
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also offers `/bin/ksh` and `/bin/zsh`. The most popular by far is bash.
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## Special Accounts
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@@ -32,10 +32,7 @@ In certain contexts (eg in [`sssd.conf(5)`](https://linux.die.net/man/5/sssd.con
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## Linux Computer Objects
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Computer objects for Linux systems are created in
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`OU=linux,OU=servers,OU=psi,DC=d,DC=psi,DC=ch`. We currently do not distinguish
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between servers and workstations in AD (unlike the Windows team), as the
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distinction isn't clear and it wouldn't help us anyway (as we don't use AD group
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policies).
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`OU=linux,OU=servers,OU=psi,DC=d,DC=psi,DC=ch` or `OU=linux,OU=computers,OU=psi,DC=d,DC=psi,DC=ch` (workstation and consoles).
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We perform the join password-less, by pre-creating the computer object using a
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script running on the Puppet master.
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