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Bug 2033654 - RFE: provide a command for generating VM launch blob and tik/tek keys
Summary: RFE: provide a command for generating VM launch blob and tik/tek keys
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: sevctl
Version: 9.1
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: 9.1
Assignee: Tyler Fanelli
QA Contact: zixchen
URL:
Whiteboard:
Depends On: 2085085
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-12-17 14:40 UTC by Daniel Berrangé
Modified: 2022-11-15 11:38 UTC (History)
6 users (show)

Fixed In Version: sevctl-0.3.0-4.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-11-15 10:31:18 UTC
Type: Feature Request
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-106105 0 None None None 2021-12-17 14:43:41 UTC
Red Hat Product Errata RHBA-2022:8171 0 None None None 2022-11-15 10:31:37 UTC

Description Daniel Berrangé 2021-12-17 14:40:43 UTC 
Description of problem:
In order to do validation of a SEV enabled VM's measurement, we need to be able to provide a launch blob to libvirt/QEMU.

Currently the only CLI tool that can do this is 'sevtool' via its 'generate_launch_blob' command. Since we're not shipping 'sevtool', we need equivalent functionality to be made available in 'sevctl'.

It doesn't have to look the same as sevtool, just needs to cover the releveant data items.

Given a 'pdh' for the host to the VM will run on it needs to be possible to obtain 

 - The guest owner's DH cert   (for the <dhCert> XML field - https://libvirt.org/formatdomain.html#launch-security)
 - A launch blob for the VM to be run (for the <session> XML field 
 - The TIK/TEK keys required to verify the measurement produced by the VM

Version-Release number of selected component (if applicable):
sevctl-0.1.0
Comment 3 Tyler Fanelli 2021-12-23 15:36:09 UTC 
https://github.com/tylerfanelli/sevctl/commit/4dea136520385259ee6953d65de73bd46773b70a

Above commit relies on changes + updated release of the sev library. Once those changes are reflected downstream (in this case meaning crates.io), a PR will be drafted. Once that is finished, libvirt will be able to consume the command for remote attestation.
Comment 4 John Ferlan 2022-05-12 20:58:31 UTC 
Committed upstream to https://github.com/virtee/sevctl/commit/2fde7c44f3bfc6514bd029924140798199a46ecd

Will eventually be resolved as part of rebase to new sevctl release

Move to POST since code is already completed upstream.
Comment 8 zixchen 2022-07-05 10:01:16 UTC 
Since sevctl-0.3.0-4.el9 is already tested, move this to VERIFIED.
Test with sevctl-0.3.0-4.el9, sevctl session passed.

Version:
sevctl-0.3.0-4.el9
kernel-5.14.0-121.el9.x86_64

Steps:
1. Generate a SEV launch session:
# sevctl export --full /home/dhcert/test.chain
# ll
total 12
-rw-r--r--. 1 root root 11536 Jul  4 23:37 test.chain
# sevctl session --name sev_es_dhcert /home/dhcert/test.chain 7
# ll
total 28
-rw-r--r--. 1 root root  2780 Jul  4 23:37 sev_es_dhcert_godh.b64
-rw-r--r--. 1 root root   172 Jul  4 23:37 sev_es_dhcert_session.b64
-rw-r--r--. 1 root root    16 Jul  4 23:37 sev_es_dhcert_tek.bin
-rw-r--r--. 1 root root    16 Jul  4 23:37 sev_es_dhcert_tik.bin
-rw-r--r--. 1 root root 11536 Jul  4 23:37 test.chain
# cat sev_es_dhcert_godh.b64 
AQAAAAAAAAADEAAAAwAAAAIAAABnDDWdHqEe7no7eTEIJX/X0dHAYBIxY59MDnu+oKuiTT+RXBPs11YqoSW4MklcGb4AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD7vn2JkGvRKerm26NRxavVPTqKvII1bMEL1OtBmJaA2/UM09FFgXFKLw6c2nIuNeIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
# cat sev_es_dhcert_session.b64 
YqL8iYUokzbko04ijfqn8B0+rxFA1rdVp42EDenWu1Zp5/mgj9XdOLk3S2K6npzG21TAc262YczFbr9JJhJ+L/GUanye9JSwffniO0rEKjG03mV9xPXRAqcZFs3k2U5wKaUrF2D5MfKv+ZuPvEXOVQdlK4xDqGys8Q2gp0E/BHQ=
2. Add session blob and dhCert to VM xml:
...
<launchSecurity type='sev'>
    <cbitpos>51</cbitpos>
    <reducedPhysBits>1</reducedPhysBits>
    <policy>0x0007</policy>     
<dhCert>AQAAAAAAAAADEAAAAwAAAAIAAABnDDWdHqEe7no7eTEIJX/X0dHAYBIxY59MDnu+oKuiTT+RXBPs11YqoSW4MklcGb4AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD7vn2JkGvRKerm26NRxavVPTqKvII1bMEL1OtBmJaA2/UM09FFgXFKLw6c2nIuNeIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=</dhCert>    <session>YqL8iYUokzbko04ijfqn8B0+rxFA1rdVp42EDenWu1Zp5/mgj9XdOLk3S2K6npzG21TAc262YczFbr9JJhJ+L/GUanye9JSwffniO0rEKjG03mV9xPXRAqcZFs3k2U5wKaUrF2D5MfKv+ZuPvEXOVQdlK4xDqGys8Q2gp0E/BHQ=</session>
</launchSecurity>
...
3. Reboot sev-es guest and check sev-es enabled inside the guest:
# dmesg|grep -i sev
[    0.247196] AMD Memory Encryption Features active: SEV SEV-ES
Comment 10 errata-xmlrpc 2022-11-15 10:31:18 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sevctl bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8171
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