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subgraph-oz/config.go

85 lines
2.0 KiB

package oz
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"syscall"
)
type Config struct {
ProfileDir string `json:"profile_dir"`
ShellPath string `json:"shell_path"`
SandboxPath string `json:"sandbox_path"`
BridgeMACAddr string `json:"bridge_mac"`
NMIgnoreFile string `json:"nm_ignore_file"`
UseFullDev bool `json:"use_full_dev"`
AllowRootShell bool `json:"allow_root_shell"`
LogXpra bool `json:"log_xpra"`
EnvironmentVars []string `json:"environment_vars"`
}
const DefaultConfigPath = "/etc/oz/oz.conf"
func NewDefaultConfig() *Config {
return &Config{
ProfileDir: "/var/lib/oz/cells.d",
ShellPath: "/bin/bash",
SandboxPath: "/srv/oz",
NMIgnoreFile: "/etc/NetworkManager/conf.d/oz.conf",
BridgeMACAddr: "6A:A8:2E:56:E8:9C",
UseFullDev: false,
AllowRootShell: false,
LogXpra: false,
EnvironmentVars: []string{
"USER", "USERNAME", "LOGNAME",
"LANG", "LANGUAGE", "_",
},
}
}
func LoadConfig(cpath string) (*Config, error) {
if _, err := os.Stat(cpath); os.IsNotExist(err) {
return nil,err
}
if err := checkConfigPermissions(cpath); err != nil {
return nil, err
}
bs, err := ioutil.ReadFile(cpath)
if err != nil {
return nil, err
}
c := NewDefaultConfig()
if err := json.Unmarshal(bs, c); err != nil {
return nil, err
}
return c, nil
}
func checkConfigPermissions(fpath string) error {
pd := path.Dir(fpath)
for _, fp := range []string{pd, fpath} {
if err := checkPathRootPermissions(fp); err != nil {
return fmt.Errorf("file (%s) is %s", fp, err)
}
}
return nil
}
func checkPathRootPermissions(fpath string) error {
fstat, err := os.Stat(fpath)
if err != nil {
return err
}
if (fstat.Mode().Perm() & syscall.S_IWOTH) != 0 {
return fmt.Errorf("writable by everyone!", fpath)
}
if (fstat.Mode().Perm() & syscall.S_IWGRP) != 0 && fstat.Sys().(*syscall.Stat_t).Gid != 0 {
return fmt.Errorf("writable by someone else than root!", err)
}
return nil
}