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Finished the OpenBSD pledge/unveil implementation after testing SCGI procs.

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This commit is contained in:
kvothe 2020-09-16 23:24:41 -04:00
parent 69a253f820
commit fb77a13088
1 changed files with 21 additions and 6 deletions
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27
security_openbsd.go
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@ -8,15 +8,20 @@ import (
// Restrict access to the files specified in config in an OS-dependent way.
// The OpenBSD implementation uses pledge(2) and unveil(2) to restrict the
// operations available to the molly brown executable.
// operations available to the molly brown executable. Please note that (S)CGI
// processes that molly brown spawns or communicates with are unrestristricted
// and should pledge their own restrictions and unveil their own files.
func enableSecurityRestrictions(config Config, errorLog *log.Logger) {
// Unveil a specific list of files that we are allowed to access.
// Unveil the configured document base as readable.
log.Println("Unveiling \"" + config.DocBase + "\" as readable.")
err := unix.Unveil(config.DocBase, "r")
if err != nil {
errorLog.Println("Could not unveil DocBase: " + err.Error())
log.Fatal(err)
}
// Unveil cgi path globs as executable.
for _, cgiPath := range config.CGIPaths {
cgiGlobbedPaths, err := filepath.Glob(cgiPath)
for _, cgiGlobbedPath := range cgiGlobbedPaths {
@ -28,6 +33,15 @@ func enableSecurityRestrictions(config Config, errorLog *log.Logger) {
}
}
}
// Unveil scgi socket paths as readable and writeable.
for _, scgiSocket := range config.SCGIPaths {
log.Println("Unveiling \"" + scgiSocket + "\" as read/write.")
err = unix.Unveil(scgiSocket, "rw")
}
// Finalize the unveil list.
// Any files not whitelisted above won't be accessible to molly brown.
err = unix.UnveilBlock()
if err != nil {
errorLog.Println("Could not block unveil: " + err.Error())
@ -35,14 +49,15 @@ func enableSecurityRestrictions(config Config, errorLog *log.Logger) {
}
// Pledge to only use stdio, inet, and rpath syscalls.
// If CGI paths have been specified, also allow exec syscalls.
// Please note that execpromises haven't been specified, meaning that
// CGI applications spawned by molly brown should pledge their own
// restrictions and unveil their own files.
promises := "stdio inet rpath"
if len(config.CGIPaths) > 0 {
// If CGI paths have been specified, also allow exec syscalls.
promises += " exec proc"
}
if len(config.SCGIPaths) > 0 {
// If SCGI paths have been specified, also allow unix sockets.
promises += " unix"
}
err = unix.PledgePromises(promises)
if err != nil {
errorLog.Println("Could not pledge: " + err.Error())