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Handle dropping capabilties correctly when running as non root user

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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
This commit is contained in:
Daniel J Walsh
2020-06-17 10:43:36 -04:00
parent 7b00e49f65
commit fe69aa9ba3
3 changed files with 59 additions and 5 deletions
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18
pkg/specgen/generate/security.go
View File

@ -67,7 +67,7 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator,
g.SetupPrivileged(true)
caplist = capabilities.AllCapabilities()
} else {
caplist, err = rtc.Capabilities(s.User, s.CapAdd, s.CapDrop)
caplist, err = capabilities.MergeCapabilities(rtc.Containers.DefaultCapabilities, s.CapAdd, s.CapDrop)
if err != nil {
return err
}
@ -107,10 +107,18 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator,
}
configSpec := g.Config
configSpec.Process.Capabilities.Bounding = caplist
configSpec.Process.Capabilities.Permitted = caplist
configSpec.Process.Capabilities.Inheritable = caplist
configSpec.Process.Capabilities.Effective = caplist
configSpec.Process.Capabilities.Ambient = caplist
if s.User == "" || s.User == "root" || s.User == "0" {
configSpec.Process.Capabilities.Effective = caplist
configSpec.Process.Capabilities.Permitted = caplist
configSpec.Process.Capabilities.Inheritable = caplist
configSpec.Process.Capabilities.Ambient = caplist
} else {
configSpec.Process.Capabilities.Effective = []string{}
configSpec.Process.Capabilities.Permitted = []string{}
configSpec.Process.Capabilities.Inheritable = []string{}
configSpec.Process.Capabilities.Ambient = []string{}
}
// HANDLE SECCOMP
if s.SeccompProfilePath != "unconfined" {
seccompConfig, err := getSeccompConfig(s, configSpec, newImage)

45
test/e2e/run_test.go
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@ -217,6 +217,51 @@ var _ = Describe("Podman run", func() {
Expect(session.ExitCode()).To(Equal(0))
})
It("podman run user capabilities test", func() {
session := podmanTest.Podman([]string{"run", "--rm", "--user", "bin", ALPINE, "grep", "CapBnd", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
session = podmanTest.Podman([]string{"run", "--rm", "--user", "bin", ALPINE, "grep", "CapEff", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("0000000000000000"))
session = podmanTest.Podman([]string{"run", "--rm", "--user", "root", ALPINE, "grep", "CapBnd", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
session = podmanTest.Podman([]string{"run", "--rm", "--user", "root", ALPINE, "grep", "CapEff", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
session = podmanTest.Podman([]string{"run", "--rm", ALPINE, "grep", "CapBnd", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
session = podmanTest.Podman([]string{"run", "--rm", ALPINE, "grep", "CapEff", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
dockerfile := `FROM busybox
USER bin`
podmanTest.BuildImage(dockerfile, "test", "false")
session = podmanTest.Podman([]string{"run", "--rm", "--user", "bin", "test", "grep", "CapBnd", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("00000000a80425fb"))
session = podmanTest.Podman([]string{"run", "--rm", "--user", "bin", "test", "grep", "CapEff", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session.ExitCode()).To(Equal(0))
Expect(session.OutputToString()).To(ContainSubstring("0000000000000000"))
})
It("podman run limits test", func() {
SkipIfRootless()
session := podmanTest.Podman([]string{"run", "--rm", "--ulimit", "rtprio=99", "--cap-add=sys_nice", fedoraMinimal, "cat", "/proc/self/sched"})

1
test/system/030-run.bats
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@ -63,6 +63,7 @@ echo $rand | 0 | $rand
@test "podman run - uidmapping has no /sys/kernel mounts" {
skip_if_rootless "cannot umount as rootless"
skip_if_remote "TODO Fix this for remote case"
run_podman run --rm --uidmap 0:100:10000 $IMAGE mount
run grep /sys/kernel <(echo "$output")