72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package app
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import (
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"path"
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"git.ophivana.moe/security/fortify/acl"
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"git.ophivana.moe/security/fortify/internal/linux"
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"git.ophivana.moe/security/fortify/internal/system"
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)
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const (
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shell = "SHELL"
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)
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// shareSystem queues various system-related actions
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func (seal *appSeal) shareSystem() {
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// ensure Share (e.g. `/tmp/fortify.%d`)
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// acl is unnecessary as this directory is world executable
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seal.sys.Ensure(seal.SharePath, 0701)
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// ensure process-specific share (e.g. `/tmp/fortify.%d/%s`)
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// acl is unnecessary as this directory is world executable
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seal.share = path.Join(seal.SharePath, seal.id)
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seal.sys.Ephemeral(system.Process, seal.share, 0701)
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// ensure child tmpdir parent directory (e.g. `/tmp/fortify.%d/tmpdir`)
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targetTmpdirParent := path.Join(seal.SharePath, "tmpdir")
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seal.sys.Ensure(targetTmpdirParent, 0700)
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seal.sys.UpdatePermType(system.User, targetTmpdirParent, acl.Execute)
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// ensure child tmpdir (e.g. `/tmp/fortify.%d/tmpdir/%d`)
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targetTmpdir := path.Join(targetTmpdirParent, seal.sys.user.Uid)
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seal.sys.Ensure(targetTmpdir, 01700)
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seal.sys.UpdatePermType(system.User, targetTmpdir, acl.Read, acl.Write, acl.Execute)
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seal.sys.bwrap.Bind(targetTmpdir, "/tmp", false, true)
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// mount tmpfs on inner shared directory (e.g. `/tmp/fortify.%d`)
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seal.sys.bwrap.Tmpfs(seal.SharePath, 1*1024*1024)
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}
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func (seal *appSeal) sharePasswd(os linux.System) {
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// look up shell
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sh := "/bin/sh"
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if s, ok := os.LookupEnv(shell); ok {
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seal.sys.bwrap.SetEnv[shell] = s
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sh = s
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}
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// generate /etc/passwd
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passwdPath := path.Join(seal.share, "passwd")
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username := "chronos"
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if seal.sys.user.Username != "" {
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username = seal.sys.user.Username
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seal.sys.bwrap.SetEnv["USER"] = seal.sys.user.Username
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}
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homeDir := "/var/empty"
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if seal.sys.user.HomeDir != "" {
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homeDir = seal.sys.user.HomeDir
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seal.sys.bwrap.SetEnv["HOME"] = seal.sys.user.HomeDir
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}
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passwd := username + ":x:65534:65534:Fortify:" + homeDir + ":" + sh + "\n"
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seal.sys.Write(passwdPath, passwd)
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// write /etc/group
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groupPath := path.Join(seal.share, "group")
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seal.sys.Write(groupPath, "fortify:x:65534:\n")
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// bind /etc/passwd and /etc/group
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seal.sys.bwrap.Bind(passwdPath, "/etc/passwd")
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seal.sys.bwrap.Bind(groupPath, "/etc/group")
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}
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