Bug 540027
| Summary: | SELinux prevented asterisk from reading from the urandom device. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Wolfgang Rupprecht <wolfgang.rupprecht> |
| Component: | selinux-policy | Assignee: | Daniel Walsh <dwalsh> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 12 | CC: | bsexton, dwalsh, mgrepl |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | setroubleshoot_trace_hash:9ce5d72795aa510060c09cf4a2e5b9c8d3d0b5e7e7d2aade83f39fdffe1acac0 | ||
| Fixed In Version: | 3.6.32-49.fc12 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-12-01 16:41:01 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
You can add these rules for now using # grep avc /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Fixed in selinux-policy-3.6.32-48.fc12.noarch selinux-policy-3.6.32-49.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/selinux-policy-3.6.32-49.fc12 selinux-policy-3.6.32-49.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update selinux-policy'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2009-12131 selinux-policy-3.6.32-49.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report. |
Summary: SELinux prevented asterisk from reading from the urandom device. Detailed Description: [asterisk has a permissive type (asterisk_t). This access was not denied.] SELinux prevented asterisk from reading from the urandom device. This access should be allowed for individual applications, but there are situations where all applications require the access (for example, when ProPolice/SSP stack smashing protection is used). Allowing this access may allow malicious applications to drain the kernel entropy pool. This can compromise the ability of some software that is dependent on high quality random numbers (e.g., ssh-keygen) to operate effectively. The risk of this type of attack is relatively low. Allowing Access: Changing the "global_ssp" boolean to true will allow this access: "setsebool -P global_ssp=1." Fix Command: setsebool -P global_ssp=1 Additional Information: Source Context system_u:system_r:asterisk_t:s0 Target Context system_u:object_r:urandom_device_t:s0 Target Objects /dev/urandom [ chr_file ] Source asterisk Source Path /usr/sbin/asterisk Port <Unknown> Host (removed) Source RPM Packages asterisk-1.6.1.9-1.fc12 Target RPM Packages Policy RPM selinux-policy-3.6.32-46.fc12 Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Plugin Name global_ssp Host Name (removed) Platform Linux (removed) 2.6.31.5-127.fc12.x86_64 #1 SMP Sat Nov 7 21:11:14 EST 2009 x86_64 x86_64 Alert Count 2 First Seen Sat 21 Nov 2009 03:29:13 PM PST Last Seen Sat 21 Nov 2009 03:29:32 PM PST Local ID c1d0ec67-e63e-45e4-9f5c-68a4fc2f28e2 Line Numbers Raw Audit Messages node=(removed) type=AVC msg=audit(1258846172.904:1080): avc: denied { read } for pid=2188 comm="asterisk" path="/dev/urandom" dev=tmpfs ino=3240 scontext=system_u:system_r:asterisk_t:s0 tcontext=system_u:object_r:urandom_device_t:s0 tclass=chr_file node=(removed) type=SYSCALL msg=audit(1258846172.904:1080): arch=c000003e syscall=0 success=yes exit=8 a0=3 a1=7faf7482ec28 a2=8 a3=0 items=0 ppid=1 pid=2188 auid=4294967295 uid=488 gid=471 euid=488 suid=488 fsuid=488 egid=471 sgid=471 fsgid=471 tty=(none) ses=4294967295 comm="asterisk" exe="/usr/sbin/asterisk" subj=system_u:system_r:asterisk_t:s0 key=(null) Hash String generated from selinux-policy-3.6.32-46.fc12,global_ssp,asterisk,asterisk_t,urandom_device_t,chr_file,read audit2allow suggests: #============= asterisk_t ============== allow asterisk_t urandom_device_t:chr_file read;