66 lines
2.1 KiB
Go
66 lines
2.1 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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"path/filepath"
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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. Please note that (S)CGI
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// processes that molly brown spawns or communicates with are unrestricted
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// and should pledge their own restrictions and unveil their own files.
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func enableSecurityRestrictions(config Config, errorLog *log.Logger) {
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// Unveil the configured document base as readable.
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log.Println("Unveiling \"" + config.DocBase + "\" as readable.")
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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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// Unveil cgi path globs as executable.
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for _, cgiPath := range config.CGIPaths {
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cgiGlobbedPaths, err := filepath.Glob(cgiPath)
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for _, cgiGlobbedPath := range cgiGlobbedPaths {
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log.Println("Unveiling \"" + cgiGlobbedPath + "\" as executable.")
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err = unix.Unveil(cgiGlobbedPath, "rx")
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if err != nil {
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errorLog.Println("Could not unveil CGIPaths: " + err.Error())
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log.Fatal(err)
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}
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}
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}
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// Unveil scgi socket paths as readable and writeable.
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for _, scgiSocket := range config.SCGIPaths {
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log.Println("Unveiling \"" + scgiSocket + "\" as read/write.")
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err = unix.Unveil(scgiSocket, "rw")
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}
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// Finalize the unveil list.
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// Any files not whitelisted above won't be accessible to molly brown.
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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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// Pledge to only use stdio, inet, and rpath syscalls.
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promises := "stdio inet rpath"
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if len(config.CGIPaths) > 0 {
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// If CGI paths have been specified, also allow exec syscalls.
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promises += " exec proc"
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}
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if len(config.SCGIPaths) > 0 {
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// If SCGI paths have been specified, also allow unix sockets.
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promises += " unix"
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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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}
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