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Matt RichardsonandClaude Fable 5.1
0f767ce529
Add support for accessing the previously ssh-only debug commands via `nebula ctl <command>.` - unix socket (named pipe on windows) for communication - sockets scoped to the user + an optional group - in cmd/nebula and cmd/nebula-service, but not nebula.Main Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
//go:build openbsd
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package localapi
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import (
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"net"
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"golang.org/x/sys/unix"
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)
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// peerCheckSupported reports that this platform can identify a connecting process.
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const peerCheckSupported = true
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// peerUID returns the uid of the process on the other end of conn.
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//
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// OpenBSD reports the peer through SO_PEERCRED at SOL_SOCKET, filling a
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// `struct sockpeercred { uid_t uid; gid_t gid; pid_t pid; }`. System calls here have to
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// go through libc, so the raw getsockopt netbsd uses is not an option, and
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// golang.org/x/sys/unix has no typed wrapper for this struct. It does export
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// GetsockoptInt, which goes through its libc trampoline with a 4 byte buffer, and the
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// kernel copies out min(caller's length, option length): the first four bytes, which are
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// the uid. That is a dependence on the field order, the same one netbsd's offset carries.
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func peerUID(conn net.Conn) (uid uint32, err error) {
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err = withPeerFD(conn, func(fd int) error {
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v, credErr := unix.GetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_PEERCRED)
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if credErr != nil {
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return credErr
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}
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// A uid_t is 32 bits; GetsockoptInt read exactly that many and widened it.
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uid = uint32(v)
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return nil
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})
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return uid, err
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}
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