Bug 819896
| Summary: | host-based ssh authentication does not work because sshd-keygen does not set group readable bit on host keys to enable ssh-keysign to read them | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Andrew J. Schorr <aschorr> | ||||
| Component: | openssh | Assignee: | Petr Lautrbach <plautrba> | ||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | high | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 19 | CC: | mattias.ellert, mgrepl, plautrba, tmraz | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Unspecified | ||||||
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| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2013-04-17 06:56:43 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: | |||||||
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Given that openssh package is built with openssh-5.8p1-keyperm.patch, which enables key files owned by ssh_keys group with 0640 permissions, I've reverted 81da99ed9bb19f029edfb92f6a8839886777db49 in git. Thanks for the report. This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19 |
Created attachment 583009 [details] Enable group read on ssh host keys Description of problem: The /usr/libexec/openssh/ssh-keysign is setgid, not setuid as it used to be. The group is set to ssh_keys. In the /usr/sbin/sshd-keygen script, the keys are created with the group set to ssh_keys, but the group read bit is disabled. Thus, only root can read the keys, and host-based authentication does not work. Version-Release number of selected component (if applicable): openssh-5.9p1-22.fc17.src.rpm How reproducible: Try to use host-based authentication. You get an error like this: could not open any host key ssh_keysign: no reply key_sign failed Permission denied (publickey,hostbased) Steps to Reproduce: 1. Install Fedora. 2. Look at permissions on /etc/ssh/ssh_host_*key 3. Actual results: bash-4.2$ ls -l /etc/ssh/ssh_host_*key -rw------- 1 root ssh_keys 668 May 7 15:22 /etc/ssh/ssh_host_dsa_key -rw------- 1 root ssh_keys 965 May 7 15:22 /etc/ssh/ssh_host_key -rw------- 1 root ssh_keys 1679 May 7 15:22 /etc/ssh/ssh_host_rsa_key Expected results: bash-4.2$ ls -l /etc/ssh/ssh_host_*key -rw-r----- 1 root ssh_keys 668 May 7 15:22 /etc/ssh/ssh_host_dsa_key -rw-r----- 1 root ssh_keys 965 May 7 15:22 /etc/ssh/ssh_host_key -rw-r----- 1 root ssh_keys 1679 May 7 15:22 /etc/ssh/ssh_host_rsa_key Additional info: