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* core: Raise CAP_NET_BIND_SERVICE when binding privileged ports When CAP_NET_BIND_SERVICE is in the permitted set but not the effective set, raise it on a dedicated locked OS thread just for the bind, then lower it again and let the thread exit. This allows the binary to be granted the capability with `setcap cap_net_bind_service=+p` instead of `=+ep`. With the effective bit set, the kernel refuses to exec the binary at all when the capability can't be granted (e.g. `docker run --cap-drop ALL`, or an empty systemd CapabilityBoundingSet), even if no privileged port is ever bound. * core: Move bind capability helpers into internal package
23 lines
836 B
Go
23 lines
836 B
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !linux
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package internal
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// WithBindCapability calls listen. Raising capabilities is only
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// supported on Linux.
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func WithBindCapability(_, _ string, listen func() (any, error)) (any, error) {
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return listen()
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}
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