Support SELinux Check #386
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Mashimiao
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May 22, 2017
Mashimiao
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- update godeps and add go-selinux deps
- add selinux check in validate and runtimetest
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cmd/runtimetest/main.go
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| return fmt.Errorf("Failed to get mountLabel of %v", mount.Destination) | ||
| } | ||
| if fileLabel != spec.Linux.MountLabel { | ||
| return fmt.Errorf("Expected mountLabel %v, actual %v", spec.Linux.MountLabel, fileLabel) |
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There are no RFC 2119 requirements for the runtime for linux.mountLabel. I think we need to get spec language about what the runtime MUST do before we can fail a runtime for not doing it (opencontainers/runtime-spec#746).
| @@ -519,6 +520,12 @@ func (v *Validator) CheckLinux() (msgs []string) { | |||
| } | |||
| } | |||
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| if v.spec.Linux.MountLabel != "" { | |||
| if err := label.Validate(v.spec.Linux.MountLabel); err != nil { | |||
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I'm not sure what label.Validate is checking, but the spec places no limits on the linux.mountLabel value. If we want to validate it (against a particular kernel API?), then I think we probably need clarity in the spec about what API the value will be passed to, and the check here should probably only happen when HostSpecific is set.
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The validation of mountLabel is not host-specific. It just checks whether label contains unexpected options. Please refer to label.Validate()
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It just checks whether label contains unexpected options.
But there is nothing in the spec about “MUST be a valid SELinux label according to [some SELinux spec]” or “MUST NOT contain z or Z” or anything like that. Currently spec-readers have to make that jump on their own.
And I was suggesting host-specific because even if z and Z are not legal labels for today's kernel, are we sure that they will be illegal labels for all kernels? Maybe someone compiles a Linux kernel where they are legal, and the spec's kernel-punt-where-possible approach is designed to support that sort of thing.
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I still don't see spec grounds for this check, but if the runtime-tools maintainers feel like it's grounded (or if they just want “unlikely to be supported by the kernel” warnings), then the validate/ changes from this PR belong in v0.3.0. That could either happen by spinning them out into a new PR, or by reviewing them here in the context of the runtimetest changes.
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LGTM |
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Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
cmd/runtimetest/main.go
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| if err != nil { | ||
| return fmt.Errorf("Failed to get mountLabel of %v", mount.Destination) | ||
| } | ||
| if fileLabel != spec.Linux.MountLabel { |
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Linux judgment should be increased to avoid panic.
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Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
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LGTM |
