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|
package bwrap
import (
"encoding/gob"
"os"
"slices"
"strconv"
"git.gensokyo.uk/security/fortify/internal/proc"
)
type Builder interface {
Len() int
Append(args *[]string)
}
type FSBuilder interface {
Path() string
Builder
}
type FDBuilder interface {
Len() int
Append(args *[]string, extraFiles *[]*os.File) error
}
func init() {
gob.Register(new(pairF))
gob.Register(new(stringF))
}
type pairF [3]string
func (p *pairF) Path() string {
return p[2]
}
func (p *pairF) Len() int {
return len(p) // compiler replaces this with 3
}
func (p *pairF) Append(args *[]string) {
*args = append(*args, p[0], p[1], p[2])
}
type stringF [2]string
func (s stringF) Path() string {
return s[1]
}
func (s stringF) Len() int {
return len(s) // compiler replaces this with 2
}
func (s stringF) Append(args *[]string) {
*args = append(*args, s[0], s[1])
}
type fileF struct {
name string
file *os.File
}
func (f *fileF) Len() int {
if f.file == nil {
return 0
}
return 2
}
func (f *fileF) Append(args *[]string, extraFiles *[]*os.File) error {
if f.file == nil {
return nil
}
extraFile(args, extraFiles, f.name, f.file)
return nil
}
func extraFile(args *[]string, extraFiles *[]*os.File, name string, f *os.File) {
if f == nil {
return
}
*args = append(*args, name, strconv.Itoa(int(proc.ExtraFileSlice(extraFiles, f))))
}
// Args returns a slice of bwrap args corresponding to c.
func (c *Config) Args() (args []string) {
builders := []Builder{
c.boolArgs(),
c.intArgs(),
c.stringArgs(),
c.pairArgs(),
}
// copy FSBuilder slice to builder slice
fb := make([]Builder, len(c.Filesystem)+1)
for i, f := range c.Filesystem {
fb[i] = f
}
fb[len(fb)-1] = c.Chmod
builders = append(builders, fb...)
// accumulate arg count
argc := 0
for _, b := range builders {
argc += b.Len()
}
args = make([]string, 0, argc)
for _, b := range builders {
b.Append(&args)
}
return
}
func (c *Config) FDArgs(syncFd *os.File, extraFiles *[]*os.File) (args []string, err error) {
builders := []FDBuilder{
&seccompBuilder{c},
&fileF{positionalArgs[SyncFd], syncFd},
}
argc := 0
for _, b := range builders {
argc += b.Len()
}
args = make([]string, 0, argc)
*extraFiles = slices.Grow(*extraFiles, len(builders))
for _, b := range builders {
if err = b.Append(&args, extraFiles); err != nil {
break
}
}
return
}
|
