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qubes-doc/services/admin-api.md
Marek Marczykowski-Górecki 9e48ca78cc
admin-api: add commands to update selected settings 
Generally modifying storage volume/pool settings require removing and
creating the object again. This is not only API limitation, but most of
them really need the object to be recreated (for example storage pool
have most settings related to physical location of the data).
But some properties are safe to change. This applies to
`revisions_to_keep` (both storage pool and volume). Introduce
appropriate API methods for this. Put property name in API call name,
because argument is already used. And also because we don't plan to be
too flexible here - we may need to add one or two more mutable properties,
but definitely we don't want to allow any of them (as explained above).

The same applies to `persistent` option of device. There, in theory
detach+attach should be enough at all times, but in practice domain may
use the device (for example system being started from it -
QubesOS/qubes-issues#3055).
2017-09-02 00:59:26 +02:00

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---
layout: doc-full
title: Admin API
permalink: /doc/admin-api/
redirect_from:
- /doc/mgmt/
- /doc/mgmt1/
- /doc/mgmt-architecture/
- /doc/admin-api-architecture/
---
# Qubes OS Admin API
*(This page is the current draft of the proposal. It is not implemented yet.)*
## Goals
The goals of the Admin API system is to provide a way for the user to manage
the domains without direct access to dom0.
Foreseen benefits include:
- Ability to remotely manage the Qubes OS.
- Possibility to create multi-user system, where different users are able to use
different sets of domains, possibly overlapping. This would also require to
have separate GUI domain.
The API would be used by:
- Qubes OS Manager (or any tools that would replace it)
- CLI tools, when run from another VM (and possibly also from dom0)
- remote management tools
- any custom tools
## Threat model
TBD
## Components
![Admin API Architecture][admin-api-architecture]
A central entity in the Qubes Admin API system is a `qubesd` daemon, which
holds information about all domains in the system and mediates all actions (like
starting and stopping a qube) with `libvirtd`. The `qubesd` daemon also manages
the `qubes.xml` file, which stores all persistent state information and
dispatches events to extensions. Last but not least, `qubesd` is responsible for
querying the RPC policy for qrexec daemon.
The `qubesd` daemon may be accessed from other domains through a set of qrexec
API calls called the "Admin API". This API is the intended
management interface supported by the Qubes OS. The API is stable. When called,
the RPC handler performs basic validation and forwards the request to the
`qubesd` via UNIX domain socket. The socket API is private and unstable. It is
documented [FIXME currently it isn't -- woju 20161221] in the developer's
documentation of the source code.
## The calls
The API should be implemented as a set of qrexec calls. This is to make it easy
to set the policy using current mechanism.
| call | dest | argument | inside | return | note |
| ------------------------------------- | --------- | --------- | ----------------------------------------- | --------------------------------------------------------- | ---- |
| `admin.vmclass.List` | `dom0` | - | - | `<class>\n` |
| `admin.vm.List` | `dom0|<vm>` | - | - | `<name> class=<class> state=<state>\n` |
| `admin.vm.Create.<class>` | `dom0` | template | `name=<name> label=<label>` | - |
| `admin.vm.CreateInPool.<class>` | `dom0` | template | `name=<name> label=<label> `<br/>`pool=<pool> pool:<volume>=<pool>` | - | either use `pool=` to put all volumes there, <br/>or `pool:<volume>=` for individual volumes - both forms are not allowed at the same time
| `admin.vm.CreateDisposable` | template | - | - | name | Create new DisposableVM, `template` is any AppVM with `dispvm_allowed` set to True, or `dom0` to use default defined in `default_dispvm` property of calling VM; VM created with this call will be automatically removed after its shutdown; the main difference from `admin.vm.Create.DispVM` is automatic (random) name generation.
| `admin.vm.Remove` | vm | - | - | - |
| `admin.label.List` | `dom0` | - | - | `<property>\n` |
| `admin.label.Create` | `dom0` | label | `0xRRGGBB` | - |
| `admin.label.Get` | `dom0` | label | - | `0xRRGGBB` |
| `admin.label.Index` | `dom0` | label | - | `<label-index>` |
| `admin.label.Remove` | `dom0` | label | - | - |
| `admin.property.List` | `dom0` | - | - | `<property>\n` |
| `admin.property.Get` | `dom0` | property | - | `default={True|False} `<br/>`type={str|int|bool|vm|label} <value>` |
| `admin.property.Help` | `dom0` | property | - | `help` |
| `admin.property.HelpRst` | `dom0` | property | - | `help.rst` |
| `admin.property.Reset` | `dom0` | property | - | - |
| `admin.property.Set` | `dom0` | property | value | - |
| `admin.vm.property.List` | vm | - | - | `<property>\n` |
| `admin.vm.property.Get` | vm | property | - | `default={True|False} `<br/>`type={str|int|bool|vm|label} <value>` |
| `admin.vm.property.Help` | vm | property | - | `help` |
| `admin.vm.property.HelpRst` | vm | property | - | `help.rst` |
| `admin.vm.property.Reset` | vm | property | - | - |
| `admin.vm.property.Set` | vm | property | value | - |
| `admin.vm.feature.List` | vm | - | - | `<feature>\n` |
| `admin.vm.feature.Get` | vm | feature | - | value |
| `admin.vm.feature.CheckWithTemplate` | vm | feature | - | value |
| `admin.vm.feature.Remove` | vm | feature | - | - |
| `admin.vm.feature.Set` | vm | feature | value | - |
| `admin.vm.tag.List` | vm | - | - | `<tag>\n` |
| `admin.vm.tag.Get` | vm | tag | - | `0` or `1` | retcode? |
| `admin.vm.tag.Remove` | vm | tag | - | - |
| `admin.vm.tag.Set` | vm | tag | - | - |
| `admin.vm.firewall.Get` | vm | - | - | `<rule>\n` | rules syntax as in [firewall interface](/doc/vm-interface/#firewall-rules-in-4x) with addition of `expire=` and `comment=` options; `comment=` (if present) must be the last option
| `admin.vm.firewall.Set` | vm | - | `<rule>\n` | - | set firewall rules, see `admin.vm.firewall.Get` for syntax
| `admin.vm.firewall.Reload` | vm | - | - | - | force reload firewall without changing any rule
| `admin.vm.device.<class>.Attach` | vm | device | options | - | `device` is in form `<backend-name>+<device-ident>` <br/>optional options given in `key=value` format, separated with spaces; <br/>options can include `persistent=True` to "persistently" attach the device (default is temporary)
| `admin.vm.device.<class>.Detach` | vm | device | - | - | `device` is in form `<backend-name>+<device-ident>`
| `admin.vm.device.<class>.Set.persistent`| vm | device | `True`|`False` | - | `device` is in form `<backend-name>+<device-ident>`
| `admin.vm.device.<class>.List` | vm | - | - | `<device> <options>\n` | options can include `persistent=True` for "persistently" attached devices (default is temporary)
| `admin.vm.device.<class>.Available` | vm | device-ident | - | `<device-ident> <properties> description=<desc>\n` | optional service argument may be used to get info about a single device, <br/>optional (device class specific) properties are in `key=value` form, <br/>`description` must be the last one and is the only one allowed to contain spaces
| `admin.pool.List` | `dom0` | - | - | `<pool>\n` |
| `admin.pool.ListDrivers` | `dom0` | - | - | `<pool-driver> <property> ...\n` | Properties allowed in `admin.pool.Add`
| `admin.pool.Info` | `dom0` | pool | - | `<property>=<value>\n` |
| `admin.pool.Add` | `dom0` | driver | `<property>=<value>\n` | - |
| `admin.pool.Set.revisions_to_keep` | `dom0` | pool | `<value>` | - |
| `admin.pool.Remove` | `dom0` | pool | - | - |
| `admin.pool.volume.List` | `dom0` | pool | - | volume id |
| `admin.pool.volume.Info` | `dom0` | pool | vid | `<property>=<value>\n` |
| `admin.pool.volume.Set.revisions_to_keep`| `dom0` | pool | `<vid> <value>` | - |
| `admin.pool.volume.ListSnapshots` | `dom0` | pool | vid | `<snapshot>\n` |
| `admin.pool.volume.Snapshot` | `dom0` | pool | vid | snapshot |
| `admin.pool.volume.Revert` | `dom0` | pool | `<vid> <snapshot>` | - |
| `admin.pool.volume.Resize` | `dom0` | pool | `<vid> <size_in_bytes>` | - |
| `admin.pool.volume.Import` | `dom0` | pool | `<vid>\n<raw volume data>` | - |
| `admin.pool.volume.CloneFrom` | `dom0` | pool | vid | token, to be used in `admin.pool.volume.CloneTo` | obtain a token to copy volume `vid` in `pool`;<br/>the token is one time use only, it's invalidated by `admin.pool.volume.CloneTo`, even if the operation fails |
| `admin.pool.volume.CloneTo` | `dom0` | pool | `<vid> <token>` | - | copy volume pointed by a token to volume `vid` in `pool` |
| `admin.vm.volume.List` | vm | - | - | `<volume>\n` | `<volume>` is per-VM volume name (`root`, `private`, etc), `<vid>` is pool-unique volume id
| `admin.vm.volume.Info` | vm | volume | - | `<property>=<value>\n` |
| `admin.vm.volume.Set.revisions_to_keep`| vm | volume | value | - |
| `admin.vm.volume.ListSnapshots` | vm | volume | - | snapshot | duplicate of `admin.pool.volume.`, but with other call params |
| `admin.vm.volume.Snapshot` | vm | volume | - | snapshot | id. |
| `admin.vm.volume.Revert` | vm | volume | snapshot | - | id. |
| `admin.vm.volume.Resize` | vm | volume | size_in_bytes | - | id. |
| `admin.vm.volume.Import` | vm | volume | raw volume data | - | id. |
| `admin.vm.volume.CloneFrom` | vm | volume | - | token, to be used in `admin.vm.volume.CloneTo` | obtain a token to copy `volume` of `vm`;<br/>the token is one time use only, it's invalidated by `admin.vm.volume.CloneTo`, even if the operation fails |
| `admin.vm.volume.CloneTo` | vm | volume | token, obtained with `admin.vm.volume.CloneFrom` | - | copy volume pointed by a token to `volume` of `vm` |
| `admin.vm.Start` | vm | - | - | - |
| `admin.vm.Shutdown` | vm | - | - | - |
| `admin.vm.Pause` | vm | - | - | - |
| `admin.vm.Unpause` | vm | - | - | - |
| `admin.vm.Kill` | vm | - | - | - |
| `admin.backup.Execute` | `dom0` | config id | - | - | config in `/etc/qubes/backup/<id>.conf`, only one backup operation of given `config id` can be running at once |
| `admin.backup.Info` | `dom0` | config id | - | backup info | info what would be included in the backup
| `admin.backup.Cancel` | `dom0` | config id | - | - | cancel running backup operation
| `admin.Events` | `dom0|vm` | - | - | events |
| `admin.vm.Stats` | `dom0|vm` | - | - | `vm-stats` events, see below | emit VM statistics (CPU, memory usage) in form of events
Volume properties:
- `pool`
- `vid`
- `size`
- `usage`
- `rw`
- `source`
- `save_on_stop`
- `snap_on_start`
Method `admin.vm.Stats` returns `vm-stats` events every `stats_interval` seconds, for every running VM. Parameters of `vm-stats` events:
- `memory_kb` - memory usage in kB
- `cpu_time` - absolute CPU time (in milliseconds) spent by the VM since its startup, normalized for one CPU
- `cpu_usage` - CPU usage in percents
## Returned messages
First byte of a message is a message type. This is 8 bit non-zero integer.
Values start at 0x30 (48, `'0'`, zero digit in ASCII) for readability in hexdump.
Next byte must be 0x00 (a separator).
This alternatively can be thought of as zero-terminated string containing
single ASCII digit.
### OK (0)
```
30 00 <content>
```
Server will close the connection after delivering single message.
### EVENT (1)
```
31 00 <subject> 00 <event> 00 ( <key> 00 <value> 00 )* 00
```
Events are returned as stream of messages in selected API calls. Normally server
will not close the connection.
A method yielding events will not ever return a `OK` or `EXCEPTION` message.
When calling such method, it will produce an artificial event
`connection-established` just after connection, to help avoiding race
conditions during event handler registration.
### EXCEPTION (2)
```
32 00 <type> 00 ( <traceback> )? 00 <format string> 00 ( <field> 00 )*
```
Server will close the connection.
Traceback may be empty, can be enabled server-side as part of debug mode.
Delimiting zero-byte is always present.
Fields are should substituted into `%`-style format string, possibly after
client-side translation, to form final message to be displayed unto user. Server
does not by itself support translation.
## Tags
The tags provided can be used to write custom policies. They are not used in
a&nbsp;default Qubes OS installation. However, they are created anyway.
- `created-by-<vm>` &mdash;&nbsp;Created in an extension to qubesd at the
moment of creation of the VM. Cannot be changed via API, which is also
enforced by this extension.
- `managed-by-<vm>` &mdash;&nbsp;Can be used for the same purpose, but it is
not created automatically, nor is it forbidden to set or reset this tag.
## Backup profile
Backup-related calls do not allow (yet) to specify what should be included in
the backup. This needs to be configured separately in dom0, with a backup
profile, stored in `/etc/qubes/backup/<profile>.conf`. The file use yaml syntax
and have following settings:
- `include` - list of VMs to include, can also contains tags using
`$tag:some-tag` syntax or all VMs of given type using `$type:AppVM`, known
from qrexec policy
- `exclude` - list of VMs to exclude, after evaluating `include` setting
- `destination_vm` - VM to which the backup should be send
- `destination_path` - path to which backup should be written in
`destination_vm`. This setting is given to `qubes.Backup` service and
technically it's up to it how to interpret it. In current implementation it is
interpreted as a directory where a new file should be written (with a name
based on the current timestamp), or a command where the backup should
be piped to
- `compression` - should the backup be compressed (default: True)? The value can be either
`False` or `True` for default compression, or a compression command (needs to
accept `-d` argument for decompression)
- `passphrase_text` - passphrase used to encrypt and integrity protect the backup
- `passphrase_vm` - VM which should be asked what backup passphrase should be
used. The asking is performed using `qubes.BackupPassphrase+profile_name`
service, which is expected to output chosen passphrase to its stdout. Empty
output cancel the backup operation. This service can be used either to ask
the user interactively, or to have some automated passphrase handling (for
example: generate randomly, then encrypt with a public key and send
somewhere)
Not all settings needs to be set.
Example backup profile:
```yaml
# Backup only selected VMs
include:
- work
- personal
- vault
- banking
# Store the backup on external disk
destination_vm: sys-usb
destination_path: /media/my-backup-disk
# Use static passphrase
passphrase_text: "My$Very!@Strong23Passphrase"
```
And slightly more advanced one:
```yaml
# Include all VMs with a few exceptions
include:
- $type:AppVM
- $type:TemplateVM
- $type:StandaloneVM
exclude:
- untrusted
- $tag:do-not-backup
# parallel gzip for faster backup
compression: pigz
# ask 'vault' VM for the backup passphrase
passphrase_vm: vault
# send the (encrypted) backup directly to remote server
destination_vm: sys-net
destination_path: ncftpput -u my-ftp-username -p my-ftp-pass -c my-ftp-server /directory/for/backups
```
## General notes
- there is no provision for `qvm-run`, but there already exists `qubes.VMShell` call
- generally actions `*.List` return a list of objects and have "object
identifier" as first word in a row. Such action can be also called with "object
identifier" in argument to get only a single entry (in the same format).
- closing qrexec connection normally does _not_ interrupt running operation; this is important to avoid leaving the system in inconsistent state
- actual operation starts only after caller send all the parameters (including a payload), signaled by sending EOF mark; there is no support for interactive protocols, to keep the protocol reasonable simple
## TODO
- something to configure/update policy
- notifications
- how to constrain the events?
- how to pass the parameters? maybe XML, since this is trusted anyway and
parser may be complicated
- how to constrain the possible values for `admin.vm.property.Set` etc, like
"you can change `netvm`, but you have to pick from this set"; this currently
can be done by writing an extension
- a call for executing `*.desktop` file from `/usr/share/applications`, for use
with appmenus without giving access to `qubes.VMShell`; currently this can be
done by writing custom qrexec calls
- maybe some generator for `.desktop` for appmenus, which would wrap calls in
`qrexec-client-vm`
<!-- vim: set ts=4 sts=4 sw=4 et : -->
[admin-api-architecture]: /attachment/wiki/AdminAPI/admin-api-architecture.svg
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