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https://github.com/netbirdio/netbird.git
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45 lines
1.9 KiB
Go
45 lines
1.9 KiB
Go
package server
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import (
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"context"
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log "github.com/sirupsen/logrus"
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"google.golang.org/grpc/codes"
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gstatus "google.golang.org/grpc/status"
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"github.com/netbirdio/netbird/client/internal/ipcauth"
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)
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// requirePrivilegedForDangerousSSH enforces M-SSHGATE: enabling SSH root login
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// or disabling SSH authentication turns the root/LocalSystem daemon's SSH server
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// into an unauthenticated root shell (local-to-remote-root escalation), so only
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// a privileged caller (Unix root, or Windows elevated-admin/LocalSystem) may set
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// these flags to true over the local IPC.
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//
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// It gates the request fields, not the resulting config: a value already
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// persisted (e.g. set previously by root, or by MDM/managed config) is untouched;
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// only a new attempt to turn them on via SetConfig/Login is checked.
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//
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// When the caller identity cannot be verified (e.g. the daemon is on a TCP
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// control channel with no peer credentials) it fails closed — refusing rather
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// than letting an unauthenticated local caller flip these flags.
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func requirePrivilegedForDangerousSSH(ctx context.Context, enableSSHRoot, disableSSHAuth *bool) error {
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dangerous := (enableSSHRoot != nil && *enableSSHRoot) || (disableSSHAuth != nil && *disableSSHAuth)
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if !dangerous {
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return nil
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}
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id, ok := ipcauth.IdentityFromContext(ctx)
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if !ok {
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log.Warnf("denying SSH root/no-auth config change: caller identity unavailable on this control channel")
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return gstatus.Error(codes.PermissionDenied,
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"enabling SSH root login or disabling SSH authentication requires root/administrator, but the caller identity could not be verified on this daemon control channel")
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}
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if !id.IsPrivileged() {
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log.Warnf("denying SSH root/no-auth config change from non-privileged caller %s", id)
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return gstatus.Errorf(codes.PermissionDenied,
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"enabling SSH root login or disabling SSH authentication requires root/administrator (caller %s is not privileged); rerun as root/administrator", id)
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}
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return nil
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}
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