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author | 2020-10-09 00:19:18 +0530 | |
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committer | 2020-10-14 11:19:53 +0000 | |
commit | eefc3ab6cbb8a5901632f46d99e13c8d90b2415d (patch) | |
tree | 90815d532ed7b2d0962a1468aee29f05a4404eef /docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md | |
parent | 4aad369c9728061c97b3de792286e743ee884b09 (diff) |
rewrote quickstart, build-process
Revamped and updated documentation to install and build AGL images.
(removed whitespaces, added contribution guide, corrected rcar-gen3 section 7, added aglsetup.h flags to hardware support, some minor changes)
Bug-AGL: [SPEC-3633]
Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: Iedb6c7dc1661f4bc58b5f25ea5d188778c7ff908
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25407
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Diffstat (limited to 'docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md')
-rw-r--r-- | docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md b/docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md new file mode 100644 index 0000000..739ffcb --- /dev/null +++ b/docs/2_Architecture_Guides/2.2_Security_Blueprint/5_Platform/1.2.5.2_SystemD.md @@ -0,0 +1,69 @@ +--- +edit_link: '' +title: SystemD +origin_url: >- + https://raw.githubusercontent.com/automotive-grade-linux/docs-sources/master/docs/security-blueprint/part-5/2-SystemD.md +--- + +<!-- WARNING: This file is generated by fetch_docs.js using /home/boron/Documents/AGL/docs-webtemplate/site/_data/tocs/architecture/master/security_blueprint-security-blueprint-book.yml --> + +# SystemD + +`afm-system-daemon` is used to: + +- Manage users and user sessions. +- Setup applications and services (_CGroups_, _namespaces_, autostart, permissions). +- Use of `libsystemd` for its programs (event management, **D-Bus** interface). + +<!-- section-config --> + +Domain | Object | Recommendations +------------------ | -------------- | ------------------------------------ +Platform-SystemD-1 | Security model | Use Namespaces for containerization. +Platform-SystemD-2 | Security model | Use CGroups to organise processes. + +<!-- end-section-config --> + +See [systemd integration and user management](http://iot.bzh/download/public/2017/AMM-Dresden/AGL-systemd.pdf) for more information. + +## Benefits + +- Removal of one privileged process: **afm-user-daemon** +- Access and use of high level features: + + - Socket activation. + - Management of users and integration of **PAM**. + - Dependency resolution to services. + - `Cgroups` and resource control. + - `Namespaces` containerization. + - Autostart of required API. + - Permissions and security settings. + - Network management. + +<!-- pagebreak --> + +## CGroups + +Control Groups offer a lot of features, with the most useful ones you can +control: Memory usage, how much CPU time is allocated, how much device I/O is +allowed or which devices can be accessed. **SystemD** uses _CGroups_ to organise +processes (each service is a _CGroups_, and all processes started by that +service use that _CGroups_). By default, **SystemD** automatically creates a +hierarchy of slice, scope and service units to provide a unified structure for +the _CGroups_ tree. With the `systemctl` command, you can further modify this +structure by creating custom slices. Currently, in AGL, there are 2 slices +(**user.slice** and **system.slice**). + +## Namespaces + +### User side + +There are several ways of authenticating users (Key Radio Frequency, Phone, +Gesture, ...). Each authentication provides dynamic allocation of **uids** to +authenticated users. **Uids** is used to ensure privacy of users and **SMACK** +for applications privacy. + +First, the user initiates authentication with **PAM** activation. **PAM** +Standard offers highly configurable authentication with modular design like +face recognition, Voice identification or with a password. Then users should +access identity services with services and applications. |