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109 lines
3.6 KiB
Go
109 lines
3.6 KiB
Go
package certproof
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import (
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"context"
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"fmt"
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"os"
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"os/exec"
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"syscall"
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"time"
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log "github.com/sirupsen/logrus"
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"golang.org/x/sys/windows"
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"github.com/netbirdio/netbird/shared/management/certposture"
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"github.com/netbirdio/netbird/shared/management/proto"
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)
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const helperTimeout = 30 * time.Second
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// CollectProofs answers the certificate challenges in checks from every store this
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// machine can reach. The service reads the local machine store itself, where AD and
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// Intune enrol device certificates, and reaches the signed-in user's store by launching
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// a helper with that session's token. A machine at the sign-in screen therefore proves
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// device certificates alone.
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func CollectProofs(ctx context.Context, checks []*proto.Checks, peerKey []byte, cfg Config) []certposture.Proof {
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challenges := certificateChallenges(checks)
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if len(challenges) == 0 {
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logNoChallenges(checks)
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return nil
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}
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proofs := CollectChallenges(ctx, DefaultStore(), challenges, peerKey)
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// The helper already runs as the signed-in user, and an ordinary process has no
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// right to a session token, so only the service goes looking for one.
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if !runningAsLocalSystem() {
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return proofs
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}
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userProofs, err := collectAsDesktopUser(ctx, cfg.ProfileOwner, challenges, peerKey)
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if err != nil {
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log.Debugf("certificate posture: user certificate store unavailable: %v", err)
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}
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return mergeProofs(proofs, userProofs)
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}
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// UserContext identifies the session whose store a collection would include: a session
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// of the profile owner, or empty when no user store would be asked. A change means a
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// collection made earlier no longer reflects what this machine can prove.
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func UserContext(cfg Config) string {
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if !runningAsLocalSystem() {
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return ""
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}
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user, ok := CurrentDesktopUser(cfg.ProfileOwner)
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if !ok {
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return ""
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}
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defer user.Close()
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return fmt.Sprintf("%d:%s", user.Session, user.Name)
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}
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// helperStore is the store the helper reads. It runs as the signed-in user, so it wants
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// that user's store rather than the machine store the service already read.
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func helperStore() Store {
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return NewUserStore()
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}
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// collectAsDesktopUser runs the helper inside the interactive session of the signed-in
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// user. Unlike a keychain on macOS, a Windows service can assume a user identity
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// directly, so the session token goes straight into the child process.
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func collectAsDesktopUser(ctx context.Context, owner string, challenges []*proto.CertificateChallenge, peerKey []byte) ([]certposture.Proof, error) {
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user, ok := CurrentDesktopUser(owner)
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if !ok {
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return nil, nil
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}
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defer user.Close()
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binary, err := os.Executable()
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if err != nil {
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return nil, fmt.Errorf("resolve own binary: %w", err)
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}
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// The user's own environment, not the service's: the service environment may carry
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// secrets such as a setup key that the signed-in user must not be able to read.
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env, err := user.Token.Environ(false)
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if err != nil {
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return nil, fmt.Errorf("build environment of %s: %w", user.Name, err)
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}
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ctx, cancel := context.WithTimeout(ctx, helperTimeout)
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defer cancel()
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cmd := exec.CommandContext(ctx, binary, "posture", "cert-proof")
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cmd.Env = env
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cmd.SysProcAttr = &syscall.SysProcAttr{
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Token: syscall.Token(user.Token),
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HideWindow: true,
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CreationFlags: windows.CREATE_NO_WINDOW,
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}
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log.Debugf("certificate posture: asking session %d to answer %d challenges", user.Session, len(challenges))
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proofs, err := runHelperCmd(cmd, helperRequest(challenges, peerKey))
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if err != nil {
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return nil, fmt.Errorf("run helper in session %d: %w", user.Session, err)
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}
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log.Debugf("certificate posture: session %d returned %d proofs", user.Session, len(proofs))
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return proofs, nil
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}
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