forked from sylabs/singularity
/
prepare.go
200 lines (169 loc) · 5.98 KB
/
prepare.go
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// Copyright (c) 2018-2019, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package oci
import (
"fmt"
"os"
"github.com/sylabs/singularity/internal/pkg/sylog"
"github.com/sylabs/singularity/pkg/ociruntime"
"github.com/kr/pty"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/sylabs/singularity/internal/pkg/runtime/engines/config/starter"
"github.com/sylabs/singularity/pkg/util/capabilities"
)
// make master/slave as global variable to avoid GC close file descriptor
var (
master *os.File
slave *os.File
)
func (e *EngineOperations) checkCapabilities() error {
for _, cap := range e.EngineConfig.OciConfig.Process.Capabilities.Permitted {
if _, ok := capabilities.Map[cap]; !ok {
return fmt.Errorf("Unrecognized capabilities %s", cap)
}
}
for _, cap := range e.EngineConfig.OciConfig.Process.Capabilities.Effective {
if _, ok := capabilities.Map[cap]; !ok {
return fmt.Errorf("Unrecognized capabilities %s", cap)
}
}
for _, cap := range e.EngineConfig.OciConfig.Process.Capabilities.Inheritable {
if _, ok := capabilities.Map[cap]; !ok {
return fmt.Errorf("Unrecognized capabilities %s", cap)
}
}
for _, cap := range e.EngineConfig.OciConfig.Process.Capabilities.Bounding {
if _, ok := capabilities.Map[cap]; !ok {
return fmt.Errorf("Unrecognized capabilities %s", cap)
}
}
for _, cap := range e.EngineConfig.OciConfig.Process.Capabilities.Ambient {
if _, ok := capabilities.Map[cap]; !ok {
return fmt.Errorf("Unrecognized capabilities %s", cap)
}
}
return nil
}
// PrepareConfig checks and prepares the runtime engine config
func (e *EngineOperations) PrepareConfig(starterConfig *starter.Config) error {
if e.CommonConfig.EngineName != Name {
return fmt.Errorf("incorrect engine")
}
if starterConfig.GetIsSUID() {
return fmt.Errorf("SUID workflow disabled by administrator")
}
if e.EngineConfig.OciConfig.Process == nil {
return fmt.Errorf("empty OCI process configuration")
}
if e.EngineConfig.OciConfig.Linux == nil {
return fmt.Errorf("empty OCI linux configuration")
}
// reset state config that could be passed to engine
e.EngineConfig.State = ociruntime.State{}
var gids []int
uid := int(e.EngineConfig.OciConfig.Process.User.UID)
gid := e.EngineConfig.OciConfig.Process.User.GID
gids = append(gids, int(gid))
for _, g := range e.EngineConfig.OciConfig.Process.User.AdditionalGids {
gids = append(gids, int(g))
}
starterConfig.SetTargetUID(uid)
starterConfig.SetTargetGID(gids)
if !e.EngineConfig.Exec {
starterConfig.SetInstance(true)
}
userNS := false
for _, ns := range e.EngineConfig.OciConfig.Linux.Namespaces {
if ns.Type == specs.UserNamespace {
userNS = true
break
}
}
starterConfig.SetNsFlagsFromSpec(e.EngineConfig.OciConfig.Linux.Namespaces)
if err := starterConfig.SetNsPathFromSpec(e.EngineConfig.OciConfig.Linux.Namespaces); err != nil {
return err
}
if userNS {
if len(e.EngineConfig.OciConfig.Linux.UIDMappings) == 0 {
return fmt.Errorf("user namespace invoked without uid mapping")
}
if len(e.EngineConfig.OciConfig.Linux.GIDMappings) == 0 {
return fmt.Errorf("user namespace invoked without gid mapping")
}
if err := starterConfig.AddUIDMappings(e.EngineConfig.OciConfig.Linux.UIDMappings); err != nil {
return err
}
if err := starterConfig.AddGIDMappings(e.EngineConfig.OciConfig.Linux.GIDMappings); err != nil {
return err
}
}
if e.EngineConfig.OciConfig.Linux.RootfsPropagation != "" {
starterConfig.SetMountPropagation(e.EngineConfig.OciConfig.Linux.RootfsPropagation)
} else {
starterConfig.SetMountPropagation("private")
}
starterConfig.SetNoNewPrivs(e.EngineConfig.OciConfig.Process.NoNewPrivileges)
if e.EngineConfig.OciConfig.Process.Capabilities != nil {
if err := e.checkCapabilities(); err != nil {
return err
}
// force cap_sys_admin for seccomp and no_new_priv flag
caps := append(e.EngineConfig.OciConfig.Process.Capabilities.Effective, "CAP_SYS_ADMIN")
starterConfig.SetCapabilities(capabilities.Effective, caps)
caps = append(e.EngineConfig.OciConfig.Process.Capabilities.Permitted, "CAP_SYS_ADMIN")
starterConfig.SetCapabilities(capabilities.Permitted, caps)
starterConfig.SetCapabilities(capabilities.Inheritable, e.EngineConfig.OciConfig.Process.Capabilities.Inheritable)
starterConfig.SetCapabilities(capabilities.Bounding, e.EngineConfig.OciConfig.Process.Capabilities.Bounding)
starterConfig.SetCapabilities(capabilities.Ambient, e.EngineConfig.OciConfig.Process.Capabilities.Ambient)
}
e.EngineConfig.MasterPts = -1
e.EngineConfig.SlavePts = -1
e.EngineConfig.OutputStreams = [2]int{-1, -1}
e.EngineConfig.ErrorStreams = [2]int{-1, -1}
e.EngineConfig.InputStreams = [2]int{-1, -1}
if e.EngineConfig.GetLogFormat() == "" {
sylog.Debugf("No log format specified, setting kubernetes log format by default")
e.EngineConfig.SetLogFormat("kubernetes")
}
if !e.EngineConfig.Exec {
if e.EngineConfig.OciConfig.Process.Terminal {
var err error
master, slave, err = pty.Open()
if err != nil {
return err
}
consoleSize := e.EngineConfig.OciConfig.Process.ConsoleSize
if consoleSize != nil {
var size pty.Winsize
size.Cols = uint16(consoleSize.Width)
size.Rows = uint16(consoleSize.Height)
if err := pty.Setsize(slave, &size); err != nil {
return err
}
}
e.EngineConfig.MasterPts = int(master.Fd())
e.EngineConfig.SlavePts = int(slave.Fd())
} else {
r, w, err := os.Pipe()
if err != nil {
return err
}
e.EngineConfig.OutputStreams = [2]int{int(r.Fd()), int(w.Fd())}
r, w, err = os.Pipe()
if err != nil {
return err
}
e.EngineConfig.ErrorStreams = [2]int{int(r.Fd()), int(w.Fd())}
r, w, err = os.Pipe()
if err != nil {
return err
}
e.EngineConfig.InputStreams = [2]int{int(w.Fd()), int(r.Fd())}
}
} else {
starterConfig.SetJoinMount(true)
}
return nil
}