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Description of problem: If NSSCertificateDatabase directory is not readable by httpd user a segmentation fault occurs during startup. Segmentation faults repeat until httpd is manually stopped. Version-Release number of selected component (if applicable): mod_nss-1.0.11-6.el7.x86_64 How reproducible: Always Steps to Reproduce: 1. chmod 0700 /etc/httpd/alias Actual results: [Sat Feb 27 10:34:08.466140 2016] [:error] [pid 3035] Unable to change directory to /etc/httpd/alias [Sat Feb 27 10:34:09.467917 2016] [core:notice] [pid 2968] AH00052: child pid 3035 exit signal Segmentation fault (11) [Sat Feb 27 10:34:09.468935 2016] [:error] [pid 3037] Unable to change directory to /etc/httpd/alias [Sat Feb 27 10:34:09.470572 2016] [:error] [pid 3038] Unable to change directory to /etc/httpd/alias [Sat Feb 27 10:34:10.471622 2016] [core:notice] [pid 2968] AH00052: child pid 3037 exit signal Segmentation fault (11) [Sat Feb 27 10:34:10.471667 2016] [core:notice] [pid 2968] AH00052: child pid 3038 exit signal Segmentation fault (11) Expected results: Clean exit with no segmentation fault. I would expect if mod_nss cannot read the NSS DB directory that it would prevent httpd from starting up and state the permissions error. Additional info: If NSS DB directory (/etc/httpd/alias) has execute permission but the NSS DB files are not readable there's a different set of errors; see below. If this would need a new bug, let me know and I'll be happy to open it. [Sat Feb 27 10:37:45.012814 2016] [:error] [pid 3737] NSS_Initialize failed. Certificate database: /etc/httpd/alias. [Sat Feb 27 10:37:45.012844 2016] [:error] [pid 3737] SSL Library Error: -8038 SEC_ERROR_NOT_INITIALIZED [Sat Feb 27 10:37:45.901118 2016] [core:notice] [pid 3586] AH00052: child pid 3737 exit signal Segmentation fault (11)
My suggestion for this bug is to document changing owner/group ownership and permissions in /usr/share/doc/mod_nss-<version>/mod_nss.html whenever a 'certutil -d . -N' is executed.
That or we can proactively check for user/group read permissions of the apache user.
What changed here? I still see segfaults: [Tue Sep 20 19:07:27.334049 2016] [:error] [pid 12894] Unable to change directory to /etc/httpd/alias [Tue Sep 20 19:07:27.334068 2016] [:error] [pid 12894] Does the directory exist and do the permissions allow access? [Tue Sep 20 19:07:28.319846 2016] [core:notice] [pid 12793] AH00052: child pid 12891 exit signal Segmentation fault (11) [Tue Sep 20 19:07:28.319876 2016] [core:notice] [pid 12793] AH00052: child pid 12892 exit signal Segmentation fault (11) And I am not finding anything in documentation. Am I missing something?
moving bug back to assigned while it is being worked on.
The problem was that the files within the certificate database directory were being checked for read access but not the directory itself.
Have a patch in hand to address not checking the NSS database directory permissions.
Verified. Version :: mod_nss-1.0.14-7.el7.x86_64 Results :: [root@vm4 yum.local.d]# chmod 0700 /etc/httpd/alias/ [root@vm4 yum.local.d]# systemctl start httpd Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details. /var/log/httpd/error_log [Thu Sep 22 10:13:14.087491 2016] [core:notice] [pid 3655] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0 [Thu Sep 22 10:13:14.088060 2016] [suexec:notice] [pid 3655] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Thu Sep 22 10:13:14.088080 2016] [:warn] [pid 3655] NSSSessionCacheTimeout is deprecated. Ignoring. [Thu Sep 22 10:13:14.088090 2016] [:debug] [pid 3655] nss_engine_init.c(454): SNI: vm4.example.com -> vm4.example.com - RedHat [Thu Sep 22 10:13:14.089493 2016] [:error] [pid 3655] Server user apache lacks read access to NSS database directory /etc/httpd/alias.
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, 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://rhn.redhat.com/errata/RHSA-2016-2602.html