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Share podman sock bindings with other WSL distros

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Registers a rootless and rootful socket underneath /mnt/wsl/podman-sockets/[machine name]/
This allows podman remote clients on other Linux distributions to access podman.

This also registers the podman root socket under the wheel group, to allow for rootful
linking against /var/run/docker.sock, a use case expected by some clients and APIs.
While this is not recommended practice on a Linux host, a WSL guest is user-isolated
and already enables escalation trivially.

[NO NEW TESTS NEEDED]

Signed-off-by: Jason T. Greene <jason.greene@redhat.com>
This commit is contained in:
Jason T. Greene
2023-08-22 17:34:57 -05:00
parent db95e678ad
commit adf34cbd79
1 changed files with 109 additions and 3 deletions
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112
pkg/machine/wsl/machine.go
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@ -138,9 +138,69 @@ Wants=network-online.target podman.socket
ExecStart=/usr/bin/sleep infinity
`
const lingerSetup = `mkdir -p /home/[USER]/.config/systemd/[USER]/default.target.wants
ln -fs /home/[USER]/.config/systemd/[USER]/linger-example.service \
/home/[USER]/.config/systemd/[USER]/default.target.wants/linger-example.service
const lingerSetup = `mkdir -p /home/[USER]/.config/systemd/user/default.target.wants
ln -fs /home/[USER]/.config/systemd/user/linger-example.service \
/home/[USER]/.config/systemd/user/default.target.wants/linger-example.service
`
const bindMountSystemService = `
[Unit]
Description=Bind mount for system podman sockets
After=podman.socket
[Service]
RemainAfterExit=true
Type=oneshot
# Ensure user services can register sockets as well
ExecStartPre=mkdir -p -m 777 /mnt/wsl/podman-sockets
ExecStartPre=mkdir -p -m 777 /mnt/wsl/podman-sockets/%[1]s
ExecStartPre=touch /mnt/wsl/podman-sockets/%[1]s/podman-root.sock
ExecStart=mount --bind %%t/podman/podman.sock /mnt/wsl/podman-sockets/%[1]s/podman-root.sock
ExecStop=umount /mnt/wsl/podman-sockets/%[1]s/podman-root.sock
`
const bindMountUserService = `
[Unit]
Description=Bind mount for user podman sockets
After=podman.socket
[Service]
RemainAfterExit=true
Type=oneshot
# Consistency with system service (supports racing)
ExecStartPre=mkdir -p -m 777 /mnt/wsl/podman-sockets
ExecStartPre=mkdir -p -m 777 /mnt/wsl/podman-sockets/%[1]s
ExecStartPre=touch /mnt/wsl/podman-sockets/%[1]s/podman-user.sock
# Relies on /etc/fstab entry for user mounting
ExecStart=mount /mnt/wsl/podman-sockets/%[1]s/podman-user.sock
ExecStop=umount /mnt/wsl/podman-sockets/%[1]s/podman-user.sock
`
const bindMountFsTab = `/run/user/1000/podman/podman.sock /mnt/wsl/podman-sockets/%s/podman-user.sock none noauto,user,bind,defaults 0 0
`
const (
defaultTargetWants = "default.target.wants"
userSystemdPath = "/home/%[1]s/.config/systemd/user"
sysSystemdPath = "/etc/systemd/system"
userSystemdWants = userSystemdPath + "/" + defaultTargetWants
sysSystemdWants = sysSystemdPath + "/" + defaultTargetWants
bindUnitFileName = "podman-mnt-bindings.service"
bindUserUnitPath = userSystemdPath + "/" + bindUnitFileName
bindUserUnitWant = userSystemdWants + "/" + bindUnitFileName
bindSysUnitPath = sysSystemdPath + "/" + bindUnitFileName
bindSysUnitWant = sysSystemdWants + "/" + bindUnitFileName
podmanSocketDropin = "podman.socket.d"
podmanSocketDropinPath = sysSystemdPath + "/" + podmanSocketDropin
)
const configBindServices = "mkdir -p " + userSystemdWants + " " + sysSystemdWants + " " + podmanSocketDropinPath + "\n" +
"ln -fs " + bindUserUnitPath + " " + bindUserUnitWant + "\n" +
"ln -fs " + bindSysUnitPath + " " + bindSysUnitWant + "\n"
const overrideSocketGroup = `
[Socket]
SocketMode=0660
SocketGroup=wheel
`
const proxyConfigSetup = `#!/bin/bash
@ -553,9 +613,55 @@ func configureSystem(v *MachineVM, dist string) error {
return fmt.Errorf("could not create podman-machine file for guest OS: %w", err)
}
if err := configureBindMounts(dist, user); err != nil {
return err
}
return changeDistUserModeNetworking(dist, user, "", v.UserModeNetworking)
}
func configureBindMounts(dist string, user string) error {
if err := wslPipe(fmt.Sprintf(bindMountSystemService, dist), dist, "sh", "-c", "cat > /etc/systemd/system/podman-mnt-bindings.service"); err != nil {
return fmt.Errorf("could not create podman binding service file for guest OS: %w", err)
}
catUserService := "cat > " + getUserUnitPath(user)
if err := wslPipe(getBindMountUserService(dist), dist, "sh", "-c", catUserService); err != nil {
return fmt.Errorf("could not create podman binding user service file for guest OS: %w", err)
}
if err := wslPipe(getBindMountFsTab(dist), dist, "sh", "-c", "cat >> /etc/fstab"); err != nil {
return fmt.Errorf("could not create podman binding fstab entry for guest OS: %w", err)
}
if err := wslPipe(getConfigBindServicesScript(user), dist, "sh"); err != nil {
return fmt.Errorf("could not configure podman binding services for guest OS: %w", err)
}
catGroupDropin := fmt.Sprintf("cat > %s/%s", podmanSocketDropinPath, "10-group.conf")
if err := wslPipe(overrideSocketGroup, dist, "sh", "-c", catGroupDropin); err != nil {
return fmt.Errorf("could not configure podman socket group override: %w", err)
}
return nil
}
func getConfigBindServicesScript(user string) string {
return fmt.Sprintf(configBindServices, user)
}
func getBindMountUserService(dist string) string {
return fmt.Sprintf(bindMountUserService, dist)
}
func getUserUnitPath(user string) string {
return fmt.Sprintf(bindUserUnitPath, user)
}
func getBindMountFsTab(dist string) string {
return fmt.Sprintf(bindMountFsTab, dist)
}
func (v *MachineVM) setupPodmanDockerSock(dist string, rootful bool) error {
content := machine.GetPodmanDockerTmpConfig(1000, rootful, true)