Bug 2088703
| Summary: | usbguard can not log to audit log (audit_write denied) | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Rik Theys <rik.theys> |
| Component: | usbguard | Assignee: | Attila Lakatos <alakatos> |
| Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 36 | CC: | alakatos, dwalsh, grepl.miroslav, lvrabec, mmalik, omosnace, pkoncity, rsroka, vmojzis, zfridric, zpytela |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2023-05-25 15:26:31 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
The following SELinux denial appeared multiple times in enforcing mode:
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type=PROCTITLE msg=audit(05/20/2022 03:30:34.235:587) : proctitle=/usr/sbin/usbguard-daemon -f -s -c /etc/usbguard/usbguard-daemon.conf
type=SOCKADDR msg=audit(05/20/2022 03:30:34.235:587) : saddr={ saddr_fam=netlink nlnk-fam=16 nlnk-pid=0 }
type=SYSCALL msg=audit(05/20/2022 03:30:34.235:587) : arch=x86_64 syscall=sendto success=yes exit=668 a0=0xa a1=0x7fff5fe9bf50 a2=0x29c a3=0x0 items=0 ppid=1 pid=2797 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=usbguard-daemon exe=/usr/sbin/usbguard-daemon subj=system_u:system_r:usbguard_t:s0 key=(null)
type=AVC msg=audit(05/20/2022 03:30:34.235:587) : avc: denied { audit_write } for pid=2797 comm=usbguard-daemon capability=audit_write scontext=system_u:system_r:usbguard_t:s0 tcontext=system_u:system_r:usbguard_t:s0 tclass=capability permissive=0
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Reproducer:
1) update /etc/usbguard/usbguard-daemon.conf file and set AuditBackend to LinuxAudit
2) (re)start the usbguard service
This BZ should be reassigned to the usbguard component, because it ships its own policy:
# rpm -qa selinux\* usbguard\* | sort
selinux-policy-37.1-1.fc37.noarch
selinux-policy-targeted-37.1-1.fc37.noarch
usbguard-1.1.0-3.fc37.x86_64
usbguard-selinux-1.1.0-3.fc37.noarch
#
The following SELinux denial appeared in permissive mode:
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type=PROCTITLE msg=audit(05/20/2022 03:34:18.741:606) : proctitle=/usr/sbin/usbguard-daemon -f -s -c /etc/usbguard/usbguard-daemon.conf
type=SOCKADDR msg=audit(05/20/2022 03:34:18.741:606) : saddr={ saddr_fam=netlink nlnk-fam=16 nlnk-pid=0 }
type=SYSCALL msg=audit(05/20/2022 03:34:18.741:606) : arch=x86_64 syscall=sendto success=yes exit=652 a0=0xa a1=0x7fff3effc5f0 a2=0x28c a3=0x0 items=0 ppid=1 pid=2847 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=usbguard-daemon exe=/usr/sbin/usbguard-daemon subj=system_u:system_r:usbguard_t:s0 key=(null)
type=AVC msg=audit(05/20/2022 03:34:18.741:606) : avc: denied { audit_write } for pid=2847 comm=usbguard-daemon capability=audit_write scontext=system_u:system_r:usbguard_t:s0 tcontext=system_u:system_r:usbguard_t:s0 tclass=capability permissive=1
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Switching the component, consider using logging_send_audit_msgs() if appropriate. This message is a reminder that Fedora Linux 36 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 36 on 2023-05-16. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '36'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 36 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed. Fedora Linux 36 entered end-of-life (EOL) status on 2023-05-16. Fedora Linux 36 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora Linux please feel free to reopen this bug against that version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see the version field. If you are unable to reopen this bug, please file a new report against an active release. Thank you for reporting this bug and we are sorry it could not be fixed. |
Description of problem: usbguard can be configured to log to the linux audit log instead of a dedicated log file by setting the AuditBackend parameter in usbguard-daemon.conf to 'LinuxAudit' When usbguard is configured like this, the following selinux denials are logged: time->Fri May 20 08:39:02 2022 type=AVC msg=audit(1653028742.119:1055): avc: denied { audit_write } for pid=343284 comm="usbguard-daemon" capability=29 scontext=system_u:system_r:usbguard_t:s0 tcontext=system_u:system_r:usbguard_t:s0 tclass=capability permissive=0 Version-Release number of selected component (if applicable): selinux-policy-targeted-36.8-2.fc36.noarch usbguard-1.1.0-3.fc36.x86_64 How reproducible: Always Steps to Reproduce: 1. Update /etc/usbguard/usbguard-daemon.conf abd set AuditBackend to LinuxAudit 2. Trigger a usbguard message (plug in a USB device) 3. Actual results: SElinux denial message in audit log Expected results: usbguard audit information in audit log Additional info: