core: Add optional unix socket file permissions (#4741)

* core: Add optional unix socket file permissions

This commit also changes the default unix socket file permissions to `u=w,g=,o=` (octal: `0200`).
It used to default to the shell's umask (usually `u=rwx,g=rx,o=rx`, octal: `0755`).

`/run/caddy.sock` -> `/run/caddy.sock` with `0200` default perms
`/run/caddy.sock|0222` -> `/run/caddy.sock` with `0222` perms

`|` instead of `:` is used as a separator, to account for the `:` in Windows drive letters (e.g. `C:\absolute\path.sock`)

Fun fact:
The old unix(7) man page (pre Jun 2016) stated a socket needs both read and write perms.
Turns out, only write perms are needed.
Corrected in https://github.com/mkerrisk/man-pages/commit/7578ea2f85b272363d22680d69e7d32f0b59c83b
Despite this, most implementations still default to read+write to this date.

* Add cases with Windows paths to test

* Require write perms for the owning user

1 files changed, 61 insertions, 3 deletions

diff --git a/listeners.go b/listeners.go
index 1387d385b..cbce68d61 100644
--- a/listeners.go
+++ b/listeners.go
@@ -20,6 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"net"
 	"net/netip"
 	"os"
@@ -148,11 +149,27 @@ func (na NetworkAddress) Listen(ctx context.Context, portOffset uint, config net
 func (na NetworkAddress) listen(ctx context.Context, portOffset uint, config net.ListenConfig) (any, error) {
 	var ln any
 	var err error
+	var address string
+	var unixFileMode fs.FileMode
 
-	address := na.JoinHostPort(portOffset)
+	// split unix socket addr early so lnKey
+	// is independent of permissions bits
+	if na.IsUnixNetwork() {
+		var err error
+		address, unixFileMode, err = splitUnixSocketPermissionsBits(na.Host)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		address = na.JoinHostPort(portOffset)
+	}
 
-	// if this is a unix socket, see if we already have it open
+	// if this is a unix socket, see if we already have it open,
+	// force socket permissions on it and return early
 	if socket, err := reuseUnixSocket(na.Network, address); socket != nil || err != nil {
+		if err := os.Chmod(address, unixFileMode); err != nil {
+			return nil, fmt.Errorf("unable to set permissions (%s) on %s: %v", unixFileMode, address, err)
+		}
 		return socket, err
 	}
 
@@ -193,6 +210,12 @@ func (na NetworkAddress) listen(ctx context.Context, portOffset uint, config net
 		unixSockets[lnKey] = unix
 	}
 
+	if IsUnixNetwork(na.Network) {
+		if err := os.Chmod(address, unixFileMode); err != nil {
+			return nil, fmt.Errorf("unable to set permissions (%s) on %s: %v", unixFileMode, address, err)
+		}
+	}
+
 	return ln, nil
 }
 
@@ -288,6 +311,40 @@ func IsUnixNetwork(netw string) bool {
 	return strings.HasPrefix(netw, "unix")
 }
 
+// Takes a unix socket address in the unusual "path|bits" format
+// (e.g. /run/caddy.sock|0222) and tries to split it into
+// socket path (host) and permissions bits (port). Colons (":")
+// can't be used as separator, as socket paths on Windows may
+// include a drive letter (e.g. `unix/c:\absolute\path.sock`).
+// Permission bits will default to 0200 if none are specified.
+// Throws an error, if the first carrying bit does not
+// include write perms (e.g. `0422` or `022`).
+// Symbolic permission representation (e.g. `u=w,g=w,o=w`)
+// is not supported and will throw an error for now!
+func splitUnixSocketPermissionsBits(addr string) (path string, fileMode fs.FileMode, err error) {
+	addrSplit := strings.SplitN(addr, "|", 2)
+
+	if len(addrSplit) == 2 {
+		// parse octal permission bit string as uint32
+		fileModeUInt64, err := strconv.ParseUint(addrSplit[1], 8, 32)
+		if err != nil {
+			return "", 0, fmt.Errorf("could not parse octal permission bits in %s: %v", addr, err)
+		}
+		fileMode = fs.FileMode(fileModeUInt64)
+
+		// FileMode.String() returns a string like `-rwxr-xr--` for `u=rwx,g=rx,o=r` (`0754`)
+		if string(fileMode.String()[2]) != "w" {
+			return "", 0, fmt.Errorf("owner of the socket requires '-w-' (write, octal: '2') permissions at least; got '%s' in %s", fileMode.String()[1:4], addr)
+		}
+
+		return addrSplit[0], fileMode, nil
+	}
+
+	// default to 0200 (symbolic: `u=w,g=,o=`)
+	// if no permission bits are specified
+	return addr, 0200, nil
+}
+
 // ParseNetworkAddress parses addr into its individual
 // components. The input string is expected to be of
 // the form "network/host:port-range" where any part is
@@ -312,10 +369,11 @@ func ParseNetworkAddressWithDefaults(addr, defaultNetwork string, defaultPort ui
 		network = defaultNetwork
 	}
 	if IsUnixNetwork(network) {
+		_, _, err := splitUnixSocketPermissionsBits(host)
 		return NetworkAddress{
 			Network: network,
 			Host:    host,
-		}, nil
+		}, err
 	}
 	var start, end uint64
 	if port == "" {