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Use unveil(2) on OpenBSD #1194

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Use unveil(2) on OpenBSD #1194

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b16a3b0
Use unveil(2) on OpenBSD
klemensn Oct 22, 2024
ab82ca4
fine tune unveil error log
klemensn Nov 3, 2024
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16 changes: 16 additions & 0 deletions cmd/yggdrasil/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@ import (
"strings"
"syscall"

"suah.dev/protect"

"github.com/gologme/log"
gsyslog "github.com/hashicorp/go-syslog"
"github.com/hjson/hjson-go/v4"
Expand All @@ -39,6 +41,20 @@ type node struct {

// The main function is responsible for configuring and starting Yggdrasil.
func main() {
// Not all operations are coverable with pledge(2), so immediately
// limit file system access with unveil(2), effectively preventing
// "proc exec" promises right from the start:
//
// - read arbitrary config file
// - create/write arbitrary log file
// - read/write/chmod/remove admin socket, if at all
if err := protect.Unveil("/", "rwc"); err != nil {
panic(fmt.Sprintf("unveil: / rwc: %v", err))
}
if err := protect.UnveilBlock(); err != nil {
panic(fmt.Sprintf("unveil: %v", err))
}

genconf := flag.Bool("genconf", false, "print a new config to stdout")
useconf := flag.Bool("useconf", false, "read HJSON/JSON config from stdin")
useconffile := flag.String("useconffile", "", "read HJSON/JSON config from specified file path")
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1 change: 1 addition & 0 deletions go.mod
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Expand Up @@ -45,4 +45,5 @@ require (
github.com/mattn/go-runewidth v0.0.15 // indirect
github.com/olekukonko/tablewriter v0.0.5
github.com/vishvananda/netns v0.0.4 // indirect
suah.dev/protect v1.2.4
)
2 changes: 2 additions & 0 deletions go.sum
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Expand Up @@ -155,3 +155,5 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259 h1:TbRPT0HtzFP3Cno1zZo7yPzEEnfu8EjLfl6IU9VfqkQ=
gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259/go.mod h1:AVgIgHMwK63XvmAzWG9vLQ41YnVHN0du0tEC46fI7yY=
suah.dev/protect v1.2.4 h1:iVZG/zQB63FKNpITDYM/cXoAeCTIjCiXHuFVByJFDzg=
suah.dev/protect v1.2.4/go.mod h1:vVrquYO3u1Ep9Ez2z8x+6N6/czm+TBmWKZfiXU2tb54=
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