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agent: sandbox filesystem on linux (usin go-landlock) (#25)
* agent: sandbox filesystem on linux (usin go-landlock) * agent: add test for readable * agent: test case for Lockdown
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| package agent | ||
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| import "github.com/shoenig/go-landlock" | ||
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| func Lockdown(cc *CoreConfig) error { | ||
| paths := make([]*landlock.Path, 0, 4) | ||
| paths = append(paths, sysPaths...) | ||
| paths = append(paths, readable(cc)...) | ||
| locker := landlock.New(paths...) | ||
| return locker.Lock(landlock.OnlySupported) | ||
| } | ||
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| func readable(cc *CoreConfig) []*landlock.Path { | ||
| var paths []*landlock.Path | ||
| if cc.AllowFile != "" { | ||
| paths = append(paths, landlock.File(cc.AllowFile, "r")) | ||
| } | ||
| if cc.BlockFile != "" { | ||
| paths = append(paths, landlock.File(cc.BlockFile, "r")) | ||
| } | ||
| if cc.SuffixFile != "" { | ||
| paths = append(paths, landlock.File(cc.SuffixFile, "r")) | ||
| } | ||
| return paths | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| //go:build !linux | ||
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| package agent | ||
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| import ( | ||
| "github.com/shoenig/go-landlock" | ||
| ) | ||
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| var sysPaths []*landlock.Path |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| //go:build linux | ||
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| package agent | ||
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| import ( | ||
| "github.com/shoenig/go-landlock" | ||
| ) | ||
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| var sysPaths = []*landlock.Path{ | ||
| landlock.Certs(), | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package agent | ||
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| import ( | ||
| "testing" | ||
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| "github.com/shoenig/go-landlock" | ||
| "github.com/shoenig/test/must" | ||
| ) | ||
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| func Test_readable(t *testing.T) { | ||
| cases := []struct { | ||
| name string | ||
| cc *CoreConfig | ||
| exp []*landlock.Path | ||
| }{ | ||
| { | ||
| name: "none", | ||
| cc: new(CoreConfig), | ||
| exp: nil, | ||
| }, | ||
| { | ||
| name: "partial", | ||
| cc: &CoreConfig{BlockFile: "/opt/blocks.txt"}, | ||
| exp: []*landlock.Path{landlock.File("/opt/blocks.txt", "r")}, | ||
| }, | ||
| { | ||
| name: "all", | ||
| cc: &CoreConfig{ | ||
| AllowFile: "/opt/allows.txt", | ||
| BlockFile: "/opt/blocks.txt", | ||
| SuffixFile: "/opt/suffix.txt", | ||
| }, | ||
| exp: []*landlock.Path{ | ||
| landlock.File("/opt/blocks.txt", "r"), | ||
| landlock.File("/opt/allows.txt", "r"), | ||
| landlock.File("/opt/suffix.txt", "r"), | ||
| }, | ||
| }, | ||
| } | ||
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| for _, tc := range cases { | ||
| result := readable(tc.cc) | ||
| must.SliceContainsAll(t, tc.exp, result) | ||
| } | ||
| } | ||
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| func Test_Lockdown(t *testing.T) { | ||
| t.Run("ok", func(t *testing.T) { | ||
| err := Lockdown(&CoreConfig{ | ||
| BlockFile: "../hack/social-media.list", | ||
| }) | ||
| must.NoError(t, err) | ||
| }) | ||
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| t.Run("does not exist", func(t *testing.T) { | ||
| err := Lockdown(&CoreConfig{ | ||
| BlockFile: "/does/not/exist", | ||
| }) | ||
| must.ErrorContains(t, err, "no such file") | ||
| }) | ||
| } |
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