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files: perform relabeling from initrd
Now that we can relabel from the initrd, we should be able to categorically resolve all SELinux and Ignition issues. Here, we drop the hacky `ignition-relabel.service` and relabel all the files we need to on the spot! Requires: https://lore.kernel.org/selinux/20190819193032.848-1-jlebon@redhat.com/ Closes: #635
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // Copyright 2019 Red Hat, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package util | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "strings" | ||
|
|
||
| "github.com/coreos/ignition/v2/internal/distro" | ||
| ) | ||
|
|
||
| const ( | ||
| selinuxConfig = "/etc/selinux/config" | ||
| selinuxFileContexts = "contexts/files/file_contexts" | ||
| ) | ||
|
|
||
| var selinuxPolicy = "" | ||
|
|
||
| func (ut Util) getSelinuxPolicy() (string, error) { | ||
| if selinuxPolicy == "" { | ||
| configPath, err := ut.JoinPath(selinuxConfig) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| file, err := os.Open(configPath) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to open %v: %v", selinuxConfig, err) | ||
| } | ||
| defer file.Close() | ||
|
|
||
| scanner := bufio.NewScanner(file) | ||
| for scanner.Scan() { | ||
| line := strings.TrimSpace(scanner.Text()) | ||
| if strings.HasPrefix(line, "SELINUXTYPE=") { | ||
| policy := line[len("SELINUXTYPE="):] | ||
| if len(policy) == 0 { | ||
| return "", fmt.Errorf("invalid SELINUXTYPE value in %v", selinuxConfig) | ||
| } | ||
| selinuxPolicy = policy | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if selinuxPolicy == "" { | ||
| return "", fmt.Errorf("didn't find SELINUXTYPE in %v", selinuxConfig) | ||
| } | ||
| } | ||
|
|
||
| return selinuxPolicy, nil | ||
| } | ||
|
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| // RelabelFiles relabels all the files matching the globby patterns given. | ||
| func (ut Util) RelabelFiles(patterns []string) error { | ||
| policy, err := ut.getSelinuxPolicy() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| file_contexts, err := ut.JoinPath("/etc/selinux", policy, selinuxFileContexts) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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||
| cmd := exec.Command(distro.SetfilesCmd(), "-vFi0", "-r", ut.DestDir, file_contexts, "-f", "-") | ||
| cmd.Stdin = strings.NewReader(strings.Join(patterns, "\000") + "\000") | ||
| if _, err := ut.Logger.LogCmd(cmd, "relabeling %d patterns", len(patterns)); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |