51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
package main
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import (
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"golang.org/x/sys/unix"
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"log"
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)
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// Restrict access to the files specified in config in an OS-dependent way.
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// The OpenBSD implementation uses pledge(2) and unveil(2) to restrict the
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// operations available to the molly brown executable.
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func enableSecurityRestrictions(config Config, errorLog *log.Logger) {
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// Pledge to only use stdio, inet, rpath, and unveil syscalls.
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// If (S)CGI paths have been specified, also allow exec syscalls.
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// Please note that execpromises haven't been specified, meaning that
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// (S)CGI applications spawned by molly brown should pledge their own
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// restrictions.
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promises := "stdio inet rpath unveil"
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if len(config.CGIPaths) > 0 || len(config.SCGIPaths) > 0 {
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promises += " exec"
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}
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err := unix.PledgePromises(promises)
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if err != nil {
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errorLog.Println("Could not pledge: " + err.Error())
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log.Fatal(err)
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}
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// Unveil a specific list of files that we are allowed to access.
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err = unix.Unveil(config.DocBase, "r")
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if err != nil {
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errorLog.Println("Could not unveil DocBase: " + err.Error())
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log.Fatal(err)
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}
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for _, cgiPath := range config.CGIPaths {
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err = unix.Unveil(cgiPath, "rx")
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if err != nil {
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errorLog.Println("Could not unveil CGIPath: " + err.Error())
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log.Fatal(err)
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}
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}
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for _, scgiPath := range config.SCGIPaths {
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err = unix.Unveil(scgiPath, "rx")
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if err != nil {
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errorLog.Println("Could not unveil SCGIPaths: " + err.Error())
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log.Fatal(err)
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}
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}
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err = unix.UnveilBlock()
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if err != nil {
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errorLog.Println("Could not block unveil: " + err.Error())
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log.Fatal(err)
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}
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}
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