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bake: enable support for entitlements
Add support for security.insecure and network.host entitlements via bake. User needs to confirm elevated privileges through a prompt or CLI flags. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| package bake | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
| "slices" | ||
| "strings" | ||
|
|
||
| "github.com/containerd/console" | ||
| "github.com/docker/buildx/build" | ||
| "github.com/moby/buildkit/util/entitlements" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
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| type EntitlementKey string | ||
|
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| const ( | ||
| EntitlementKeyNetworkHost EntitlementKey = "network.host" | ||
| EntitlementKeySecurityInsecure EntitlementKey = "security.insecure" | ||
| EntitlementKeyFSRead EntitlementKey = "fs.read" | ||
| EntitlementKeyFSWrite EntitlementKey = "fs.write" | ||
| EntitlementKeyFS EntitlementKey = "fs" | ||
| EntitlementKeyImagePush EntitlementKey = "image.push" | ||
| EntitlementKeyImageLoad EntitlementKey = "image.load" | ||
| EntitlementKeyImage EntitlementKey = "image" | ||
| EntitlementKeySSH EntitlementKey = "ssh" | ||
| ) | ||
|
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| type EntitlementConf struct { | ||
| NetworkHost bool | ||
| SecurityInsecure bool | ||
| FSRead []string | ||
| FSWrite []string | ||
| ImagePush []string | ||
| ImageLoad []string | ||
| SSH bool | ||
| } | ||
|
|
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| func ParseEntitlements(in []string) (EntitlementConf, error) { | ||
| var conf EntitlementConf | ||
| for _, e := range in { | ||
| switch e { | ||
| case string(EntitlementKeyNetworkHost): | ||
| conf.NetworkHost = true | ||
| case string(EntitlementKeySecurityInsecure): | ||
| conf.SecurityInsecure = true | ||
| case string(EntitlementKeySSH): | ||
| conf.SSH = true | ||
| default: | ||
| k, v, _ := strings.Cut(e, "=") | ||
| switch k { | ||
| case string(EntitlementKeyFSRead): | ||
| conf.FSRead = append(conf.FSRead, v) | ||
| case string(EntitlementKeyFSWrite): | ||
| conf.FSWrite = append(conf.FSWrite, v) | ||
| case string(EntitlementKeyFS): | ||
| conf.FSRead = append(conf.FSRead, v) | ||
| conf.FSWrite = append(conf.FSWrite, v) | ||
| case string(EntitlementKeyImagePush): | ||
| conf.ImagePush = append(conf.ImagePush, v) | ||
| case string(EntitlementKeyImageLoad): | ||
| conf.ImageLoad = append(conf.ImageLoad, v) | ||
| case string(EntitlementKeyImage): | ||
| conf.ImagePush = append(conf.ImagePush, v) | ||
| conf.ImageLoad = append(conf.ImageLoad, v) | ||
| default: | ||
| return conf, errors.Errorf("uknown entitlement key %q", k) | ||
| } | ||
|
|
||
| // TODO: dedupe slices and parent paths | ||
| } | ||
| } | ||
| return conf, nil | ||
| } | ||
|
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| func (c EntitlementConf) Validate(m map[string]build.Options) (EntitlementConf, error) { | ||
| var expected EntitlementConf | ||
|
|
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| for _, v := range m { | ||
| if err := c.check(v, &expected); err != nil { | ||
| return EntitlementConf{}, err | ||
| } | ||
| } | ||
|
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| return expected, nil | ||
| } | ||
|
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| func (c EntitlementConf) check(bo build.Options, expected *EntitlementConf) error { | ||
| for _, e := range bo.Allow { | ||
| switch e { | ||
| case entitlements.EntitlementNetworkHost: | ||
| if !c.NetworkHost { | ||
| expected.NetworkHost = true | ||
| } | ||
| case entitlements.EntitlementSecurityInsecure: | ||
| if !c.SecurityInsecure { | ||
| expected.SecurityInsecure = true | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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||
| func (c EntitlementConf) Prompt(ctx context.Context, out io.Writer) error { | ||
| var term bool | ||
| if _, err := console.ConsoleFromFile(os.Stdin); err == nil { | ||
| term = true | ||
| } | ||
|
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| var msgs []string | ||
| var flags []string | ||
|
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| if c.NetworkHost { | ||
| msgs = append(msgs, " - Running build containers that can access host network") | ||
| flags = append(flags, "network.host") | ||
| } | ||
| if c.SecurityInsecure { | ||
| msgs = append(msgs, " - Running privileged containers that can make system changes") | ||
| flags = append(flags, "security.insecure") | ||
| } | ||
|
|
||
| if len(msgs) == 0 { | ||
| return nil | ||
| } | ||
|
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| fmt.Fprintf(out, "Your build is requesting privileges for following possibly insecure capabilities:\n\n") | ||
| for _, m := range msgs { | ||
| fmt.Fprintf(out, "%s\n", m) | ||
| } | ||
|
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| for i, f := range flags { | ||
| flags[i] = "--allow=" + f | ||
| } | ||
|
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| if term { | ||
| fmt.Fprintf(out, "\nIn order to not see this message in the future pass %q to grant requested privileges.\n", strings.Join(flags, " ")) | ||
| } else { | ||
| fmt.Fprintf(out, "\nPass %q to grant requested privileges.\n", strings.Join(flags, " ")) | ||
| } | ||
|
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| args := append([]string(nil), os.Args...) | ||
| if filepath.Base(args[0]) == "docker-buildx" { | ||
| args[0] = "docker" | ||
| } | ||
| idx := slices.Index(args, "bake") | ||
|
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| if idx != -1 { | ||
| fmt.Fprintf(out, "\nYour full command with requested privileges:\n\n") | ||
| fmt.Fprintf(out, "%s %s %s\n\n", strings.Join(args[:idx+1], " "), strings.Join(flags, " "), strings.Join(args[idx+1:], " ")) | ||
| } | ||
|
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| if term { | ||
| fmt.Fprintf(out, "Do you want to grant requested privileges and continue? [y/N] ") | ||
| reader := bufio.NewReader(os.Stdin) | ||
| answerCh := make(chan string, 1) | ||
| go func() { | ||
| answer, _, _ := reader.ReadLine() | ||
| answerCh <- string(answer) | ||
| close(answerCh) | ||
| }() | ||
|
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||
| select { | ||
| case <-ctx.Done(): | ||
| case answer := <-answerCh: | ||
| if strings.ToLower(string(answer)) == "y" { | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
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| return errors.Errorf("additional privileges requested") | ||
| } |
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