mirror of
https://github.com/netbirdio/netbird.git
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83 lines
3.0 KiB
Go
83 lines
3.0 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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"strconv"
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"time"
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log "github.com/sirupsen/logrus"
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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 Mac
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// can reach. The root daemon reads the System keychain itself, which is where MDM
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// installs device identities, and reaches the console user's login keychain only by
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// launching a helper into that user's session. A Mac sitting at the login window
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// therefore yields device proofs alone.
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func CollectProofs(ctx context.Context, checks []*proto.Checks, peerKey []byte, _ 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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// A helper already runs inside the user's session, so it reads its own keychain
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// directly and must never launch another one.
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if os.Geteuid() != 0 {
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return CollectChallenges(ctx, DefaultStore(), challenges, peerKey)
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}
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proofs := CollectChallenges(ctx, DefaultStore(), challenges, peerKey)
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userProofs, err := collectAsConsoleUser(ctx, challenges, peerKey)
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if err != nil {
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log.Debugf("certificate posture: console user keychain unavailable: %v", err)
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}
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return mergeProofs(proofs, userProofs)
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}
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// collectAsConsoleUser runs the helper inside the desktop session of the logged-in
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// user. Dropping to their uid is not enough: keychain access is an XPC call to a
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// per-session securityd, so the helper has to enter their Mach bootstrap namespace,
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// which is what launchctl asuser does.
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func collectAsConsoleUser(ctx context.Context, challenges []*proto.CertificateChallenge, peerKey []byte) ([]certposture.Proof, error) {
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user, ok := CurrentConsoleUser()
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if !ok {
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return nil, nil
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}
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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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ctx, cancel := context.WithTimeout(ctx, helperTimeout)
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defer cancel()
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// Absolute paths, because the daemon's PATH is configurable through the service
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// environment, and sudo selects the user by uid so the name never has to round-trip.
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uid := strconv.FormatUint(uint64(user.UID), 10)
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cmd := exec.CommandContext(ctx, "/bin/launchctl", "asuser", uid, "/usr/bin/sudo", "-u", "#"+uid, "-H", binary, "posture", "cert-proof")
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log.Debugf("certificate posture: asking the desktop session of uid %s to answer %d challenges", uid, 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 as uid %s: %w", uid, err)
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}
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log.Debugf("certificate posture: desktop session of uid %s returned %d proofs", uid, len(proofs))
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return proofs, nil
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}
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// helperStore is the store the helper reads. On macOS the keychain search list of the
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// user's own session already is that user's keychain, so the platform default is right.
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func helperStore() Store {
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return DefaultStore()
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}
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