127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
package claims
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import (
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"crypto/sha256"
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"encoding/pem"
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"errors"
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"oc-auth/conf"
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"oc-auth/infrastructure/perms_connectors"
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"oc-auth/infrastructure/utils"
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"os"
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"strings"
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"cloud.o-forge.io/core/oc-lib/tools"
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)
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type HydraClaims struct{}
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func (h HydraClaims) generateKey(relation string, path string) (string, error) {
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method, err := utils.ExtractMethod(relation, true)
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if err != nil {
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return "", err
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}
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p := strings.ReplaceAll(strings.ToUpper(path), "/", "_")
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return strings.ToLower(method.String()) + "_" + p, nil
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}
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// decode key expect to extract method and path from key
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func (h HydraClaims) decodeKey(key string, external bool) (tools.METHOD, string, error) {
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s := strings.Split(key, "_")
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if len(s) < 2 {
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return tools.GET, "", errors.New("invalid key")
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}
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if strings.Contains(strings.ToUpper(s[0]), "INTERNAL") && external {
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return tools.GET, "", errors.New("external ask for internal key")
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}
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meth, err := utils.ExtractMethod(s[0], false)
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if err != nil {
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return meth, "", err
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}
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p := strings.ReplaceAll(strings.ToLower(s[1]), "_", "/")
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return meth, p, nil
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}
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func (h HydraClaims) DecodeSignature(host string, signature string, publicKey string) (bool, error) {
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hashed := sha256.Sum256([]byte(host))
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spkiBlock, _ := pem.Decode([]byte(publicKey)) // get public key into a variable
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err := VerifyDefault(hashed[:], spkiBlock.Bytes, signature)
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if err != nil {
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return false, err
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}
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return true, nil
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}
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func (h HydraClaims) encodeSignature(host string) (string, error) {
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hashed := sha256.Sum256([]byte(host))
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// READ FILE TO GET PRIVATE KEY FROM PVK PEM PATH
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content, err := os.ReadFile(conf.GetConfig().PrivateKeyPath)
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if err != nil {
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return "", err
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}
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privateKey := string(content)
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spkiBlock, _ := pem.Decode([]byte(privateKey))
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return SignDefault(hashed[:], spkiBlock.Bytes)
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}
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func (h HydraClaims) DecodeClaimsInToken(host string, method string, forward string, sessionClaims Claims, publicKey string, external bool) (bool, error) {
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idTokenClaims := sessionClaims.Session.IDToken
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if idTokenClaims["signature"] == nil {
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return false, errors.New("no signature found")
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}
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signature := idTokenClaims["signature"].(string)
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if ok, err := h.DecodeSignature(host, signature, publicKey); !ok {
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return false, err
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}
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claims := sessionClaims.Session.AccessToken
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path := strings.ReplaceAll(forward, "http://"+host, "")
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splittedPath := strings.Split(path, "/")
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for m, p := range claims {
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splittedP := strings.Split(p.(string), "/")
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if len(splittedP) != len(splittedPath) {
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continue
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}
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for i, v := range splittedP {
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if strings.Contains(v, ":") { // is a param
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continue
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} else if v != splittedPath[i] {
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meth, _, err := h.decodeKey(m, external)
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if err != nil {
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continue
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}
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perm := perms_connectors.Permission{
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Relation: "permits" + strings.ToLower(meth.String()),
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Object: p.(string),
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}
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return perms_connectors.GetPermissionConnector().CheckPermission(perm, nil, true), nil
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}
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}
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}
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return false, errors.New("no permission found")
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}
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// add claims to token method of HydraTokenizer
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func (h HydraClaims) AddClaimsToToken(userId string, host string) Claims {
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claims := Claims{}
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perms, err := perms_connectors.KetoConnector{}.GetPermissionByUser(userId, true)
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if err != nil {
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return claims
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}
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claims.Session.AccessToken = make(map[string]interface{})
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claims.Session.IDToken = make(map[string]interface{})
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for _, perm := range perms {
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key, err := h.generateKey(strings.ReplaceAll(perm.Relation, "permits", ""), perm.Object)
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if err != nil {
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continue
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}
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claims.Session.AccessToken[key] = perm.Object
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}
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sign, err := h.encodeSignature(host)
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if err != nil {
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return claims
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}
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claims.Session.IDToken["signature"] = sign
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return claims
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}
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// add signature in the token MISSING
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