62e395b90b
The chsh application (which runs in the chfn_t domain) requires read access on
the file context definitions. If not, the following error occurs:
Changing the login shell for root
Enter the new value, or press ENTER for the default
Login Shell [/bin/zsh]: /bin/bash
chsh: failure while writing changes to /etc/passwd
The following AVC denials are shown:
Jan 23 20:23:43 lain kernel: [20378.806719] type=1400 audit(1358969023.507:585):
avc: denied { search } for pid=18281 comm="chsh" name="selinux" dev="dm-0"
ino=23724520 scontext=staff_u:sysadm_r:chfn_t
tcontext=system_u:object_r:selinux_config_t tclass=dir
In permissive mode, this goes up to:
Jan 23 20:22:15 lain kernel: [20290.691128] type=1400 audit(1358968935.217:566):
avc: denied { open } for pid=18195 comm="chsh"
path="/etc/selinux/strict/contexts/files/file_contexts" dev="dm-0" ino=23726403
scontext=staff_u:sysadm_r:chfn_t tcontext=staff_u:object_r:file_context_t
tclass=file
Hence, adding in seutil_read_file_contexts().
A second error is that chsh, if available, wants to execute nscd:
Changing the login shell for root
Enter the new value, or press ENTER for the default
Login Shell [/bin/sh]: /bin/bash
chsh: cannot execute /usr/sbin/nscd: Permission denied
chsh: nscd exited with status 126
chsh: Failed to flush the nscd cache.
chsh: cannot execute /usr/sbin/nscd: Permission denied
chsh: nscd exited with status 126
chsh: Failed to flush the nscd cache.
chsh: cannot execute /usr/sbin/nscd: Permission denied
chsh: nscd exited with status 126
chsh: Failed to flush the nscd cache.
Similar to most other user admin utilities, we grant it the rights to run nscd.
Changes since v1
- Removed seutil_dontaudit_search_config() call
Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>
|
||
|---|---|---|
| .. | ||
| admin | ||
| apps | ||
| contrib@37da3a427c | ||
| kernel | ||
| roles | ||
| services | ||
| system | ||