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extension_values_task.go
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/
extension_values_task.go
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package dissectls
import (
"github.com/tumi8/goscanner/scanner/results"
"github.com/tumi8/goscanner/tls"
"golang.org/x/crypto/cryptobyte"
"sort"
"strconv"
"strings"
)
type ExtensionValueTask struct {
points [][]uint8
}
func (c *ExtensionValueTask) SetCHValues(preset *tls.ClientHelloPreset, model *results.ServerModel, scanDoneRate float64, playSafe bool, chsLeft int) {
}
func (c *ExtensionValueTask) Done(model *results.ServerModel) bool {
return false
}
func (c *ExtensionValueTask) ResolveError(*results.ServerModel) (learnedSomething bool) { return }
func (c *ExtensionValueTask) MergeData(state tls.ConnectionState, model *results.ServerModel, preset *tls.ClientHelloPreset, err error) (errorCouldBeMe bool, learnedSomething bool) {
if state.ServerHello != nil && len(state.ServerHello.SupportedPoints) > 0 {
var p []string
for _, p_i := range state.ServerHello.SupportedPoints {
p = append(p, strconv.Itoa(int(p_i)))
}
points := strings.Join(p, "-")
present := false
for _, m := range model.SupportedPoints {
if m == points {
present = true
}
}
if !present {
model.SupportedPoints = append(model.SupportedPoints, points)
sort.Strings(model.SupportedPoints)
}
}
for _, extSlice := range [][]tls.Extension{state.ServerExtensions, state.ServerEncryptedExtensions, state.CertificateExtensions} {
for _, ext := range extSlice {
var extData cryptobyte.String
extData = ext.Data
if ext.Extension == tls.ExtensionSignatureAlgorithms {
var sigAndAlgs cryptobyte.String
if !extData.ReadUint16LengthPrefixed(&sigAndAlgs) || sigAndAlgs.Empty() {
continue
}
for !sigAndAlgs.Empty() {
var sigAndAlg uint16
if !sigAndAlgs.ReadUint16(&sigAndAlg) {
continue
}
present := false
for _, m := range model.SupportedSignaturealgorithms {
if m == sigAndAlg {
present = true
}
}
if !present {
model.SupportedSignaturealgorithms = append(model.SupportedSignaturealgorithms, sigAndAlg)
sort.Slice(model.SupportedSignaturealgorithms, func(i, j int) bool {
return model.SupportedSignaturealgorithms[i] < model.SupportedSignaturealgorithms[j]
})
}
}
} else if ext.Extension == tls.ExtensionSignatureAlgorithmsCert {
var sigAndAlgs cryptobyte.String
if !extData.ReadUint16LengthPrefixed(&sigAndAlgs) || sigAndAlgs.Empty() {
continue
}
for !sigAndAlgs.Empty() {
var sigAndAlg uint16
if !sigAndAlgs.ReadUint16(&sigAndAlg) {
continue
}
present := false
for _, m := range model.SupportedSignaturealgorithmsCert {
if m == sigAndAlg {
present = true
}
}
if !present {
model.SupportedSignaturealgorithmsCert = append(model.SupportedSignaturealgorithmsCert, sigAndAlg)
sort.Slice(model.SupportedSignaturealgorithmsCert, func(i, j int) bool {
return model.SupportedSignaturealgorithmsCert[i] < model.SupportedSignaturealgorithmsCert[j]
})
}
}
} else if ext.Extension == tls.ExtensionCertificateAuthorities {
var auths cryptobyte.String
if !extData.ReadUint16LengthPrefixed(&auths) || auths.Empty() {
continue
}
for !auths.Empty() {
var ca cryptobyte.String
if !auths.ReadUint16LengthPrefixed(&ca) || len(ca) == 0 {
continue
}
caString := string(ca)
present := false
for _, m := range model.CertificateAuthorities {
if m == caString {
present = true
}
}
if !present {
model.CertificateAuthorities = append(model.CertificateAuthorities, caString)
sort.Strings(model.CertificateAuthorities)
}
}
}
}
}
return
}
func (c *ExtensionValueTask) PostProcess(*results.ServerModel) {}