libfic/flag: add validatorRegexp field
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c2558fe0ec
commit
ff56ec9fe3
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@ -189,11 +189,12 @@ func deleteExerciceHint(hint fic.EHint, _ []byte) (interface{}, error) {
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}
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type uploadedFlag struct {
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Label string
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Help string
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ICase bool
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Flag string
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Hash []byte
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Label string
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Help string
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IgnoreCase bool
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ValidatorRe *string `json:"validator_regexp"`
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Flag string
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Value []byte
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}
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func createExerciceFlag(exercice fic.Exercice, body []byte) (interface{}, error) {
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@ -206,7 +207,12 @@ func createExerciceFlag(exercice fic.Exercice, body []byte) (interface{}, error)
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return nil, errors.New("Flag not filled")
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}
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return exercice.AddRawFlag(uk.Label, uk.Help, uk.ICase, uk.Flag)
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var vre *string = nil
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if uk.ValidatorRe != nil && len(*uk.ValidatorRe) > 0 {
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vre = uk.ValidatorRe
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}
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return exercice.AddRawFlag(uk.Label, uk.Help, uk.IgnoreCase, vre, []byte(uk.Flag))
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}
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func showExerciceFlag(flag fic.Flag, _ fic.Exercice, body []byte) (interface{}, error) {
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@ -226,8 +232,14 @@ func updateExerciceFlag(flag fic.Flag, exercice fic.Exercice, body []byte) (inte
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}
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flag.Help = uk.Help
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flag.IgnoreCase = uk.ICase
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flag.Checksum = uk.Hash
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flag.IgnoreCase = uk.IgnoreCase
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flag.Checksum = uk.Value
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if uk.ValidatorRe != nil && len(*uk.ValidatorRe) > 0 {
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flag.ValidatorRegexp = uk.ValidatorRe
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} else {
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flag.ValidatorRegexp = nil
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}
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if _, err := flag.Update(); err != nil {
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return nil, err
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@ -17,6 +17,7 @@ Tous les textes doivent utiliser l'encodage UTF8.
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- `[[flag]]` : drapeau classique à valider pour résoudre le challenge :
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* `label = "Intitulé"` : (facultatif, par défaut : `Flag`) intitulé du drapeau ;
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* `raw = 'MieH2athxuPhai6u'` : drapeau exact à trouver ;
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* `validator_regexp = "^(?:sudo +)?(.*)$"` : (facultatif) expression rationnelle dont les groupes capturés serviront comme chaîne à valider (notez que `?:` au début d'un groupe ne le capturera pas) ;
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* `ignorecase = true` : (facultatif, par défaut : `false`) ignore la case de ce drapeau ;
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* `help = "Indication"` : (facultatif) chaîne de caractères placée sous le champ du formulaire, idéale pour donner une indication de format ;
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* `[[flag.unlock_file]]` : bloque l'accès à un fichier tant que le flag n'est pas obtenu :
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@ -29,6 +30,7 @@ Tous les textes doivent utiliser l'encodage UTF8.
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- `[[flag_ucq]]` : drapeau sous forme de question à choix unique :
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* `label = "Intitulé du groupe"` : (facultatif) intitulé du groupe de choix ;
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* `raw = 'MieH2athxuPhai6u'` : drapeau attendu parmi les propositions ;
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* `validator_regexp = "^(?:sudo +)?(.*)$"` : (facultatif) expression rationnelle dont les groupes capturés serviront comme chaîne à valider (notez que `?:` au début d'un groupe ne le capturera pas) ;
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* `help = "Indication"` : (facultatif, uniquement si `displayAs = select`) chaîne de caractères placée sous le champ du formulaire ;
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* `displayAs = "select|radio"` : (facultatif, par défaut `radio`) manière dont est affichée le choix : `select` pour une liste de choix, `radio` pour des boutons radios ;
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* `choices_cost = 20` : (facultatif, par défaut `0`) coût pour afficher les choix, avant l'affichage, se comporte comme un `flag` classique (à 0, les choix sont affichés directement) ;
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@ -27,11 +27,12 @@ type ExerciceUnlockFile struct {
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// ExerciceFlag holds informations about a "classic" flag.
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type ExerciceFlag struct {
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Label string `toml:",omitempty"`
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Raw string
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IgnoreCase bool `toml:",omitempty"`
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Help string `toml:",omitempty"`
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LockedFile []ExerciceUnlockFile `toml:"unlock_file,omitempty"`
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Label string `toml:",omitempty"`
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Raw string
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IgnoreCase bool `toml:",omitempty"`
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ValidatorRe string `toml:"validator_regexp,omitempty"`
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Help string `toml:",omitempty"`
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LockedFile []ExerciceUnlockFile `toml:"unlock_file,omitempty"`
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}
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// ExerciceFlagMCQChoice holds a choice for an MCQ flag.
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@ -57,6 +58,7 @@ type ExerciceFlagUCQ struct {
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Label string `toml:",omitempty"`
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Raw string
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IgnoreCase bool `toml:",omitempty"`
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ValidatorRe string `toml:"validator_regexp,omitempty"`
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Help string `toml:",omitempty"`
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DisplayAs string `toml:",omitempty"`
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Choices_Cost int64 `toml:",omitempty"`
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@ -19,6 +19,15 @@ func isFullGraphic(s string) bool {
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return true
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}
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func validatorRegexp(vre string) (validator_regexp *string) {
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if len(vre) > 0 {
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validator_regexp = &vre
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} else {
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validator_regexp = nil
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}
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return
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}
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// SyncExerciceFlags reads the content of challenge.txt and import "classic" flags as Key for the given challenge.
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func SyncExerciceFlags(i Importer, exercice fic.Exercice) (errs []string) {
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if _, err := exercice.WipeFlags(); err != nil {
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@ -40,7 +49,7 @@ func SyncExerciceFlags(i Importer, exercice fic.Exercice) (errs []string) {
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errs = append(errs, fmt.Sprintf("%q: WARNING flag #%d: non-printable characters in flag, is this really expected?", path.Base(exercice.Path), nline + 1))
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}
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if k, err := exercice.AddRawFlag(flag.Label, flag.Help, flag.IgnoreCase, flag.Raw); err != nil {
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if k, err := exercice.AddRawFlag(flag.Label, flag.Help, flag.IgnoreCase, validatorRegexp(flag.ValidatorRe), []byte(flag.Raw)); err != nil {
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errs = append(errs, fmt.Sprintf("%q: error flag #%d: %s", path.Base(exercice.Path), nline + 1, err))
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continue
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} else {
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@ -67,7 +76,7 @@ func SyncExerciceFlags(i Importer, exercice fic.Exercice) (errs []string) {
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errs = append(errs, fmt.Sprintf("%q: WARNING flag UCQ #%d: non-printable characters in flag, is this really expected?", path.Base(exercice.Path), nline + 1))
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}
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if k, err := exercice.AddRawFlag(flag.Label, flag.Help, flag.IgnoreCase, flag.Raw); err != nil {
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if k, err := exercice.AddRawFlag(flag.Label, flag.Help, flag.IgnoreCase, validatorRegexp(flag.ValidatorRe), []byte(flag.Raw)); err != nil {
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errs = append(errs, fmt.Sprintf("%q: error flag UCQ #%d: %s", path.Base(exercice.Path), nline + 1, err))
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continue
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} else {
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@ -162,6 +162,7 @@ CREATE TABLE IF NOT EXISTS exercice_flags(
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type VARCHAR(255) NOT NULL,
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help VARCHAR(255) NOT NULL,
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ignorecase BOOLEAN NOT NULL DEFAULT 0,
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validator_regexp VARCHAR(255) NULL,
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cksum BINARY(64) NOT NULL,
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FOREIGN KEY(id_exercice) REFERENCES exercices(id_exercice)
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) DEFAULT CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
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@ -296,7 +296,7 @@ func (e Exercice) CheckResponse(respflags map[string]string, respmcq map[int64]b
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for _, flag := range flags {
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if res, ok := respflags[flag.Label]; !ok {
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valid = false
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} else if !flag.Check(res) {
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} else if !flag.Check([]byte(res)) {
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if !PartialValidation || t.HasPartiallySolved(flag) == nil {
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valid = false
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}
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@ -290,7 +290,7 @@ func (f EFile) GetDepends() ([]Flag, error) {
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if err := rows.Scan(&d); err != nil {
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return nil, err
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}
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deps = append(deps, Flag{d, f.IdExercice, "", "", false, []byte{}})
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deps = append(deps, Flag{d, f.IdExercice, "", "", false, nil, []byte{}})
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}
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if err := rows.Err(); err != nil {
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return nil, err
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@ -1,30 +1,34 @@
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package fic
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import (
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"bytes"
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"errors"
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"regexp"
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"time"
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"golang.org/x/crypto/blake2b"
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)
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// Flag represents a flag's challenge, stored as hash.
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type Flag struct {
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Id int64 `json:"id"`
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Id int64 `json:"id"`
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// IdExercice is the identifier of the underlying challenge
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IdExercice int64 `json:"idExercice"`
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IdExercice int64 `json:"idExercice"`
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// Label is the title of the flag as displayed to players
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Label string `json:"label"`
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Label string `json:"label"`
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// Help is a small piece of text that aims to add useful information like flag format, ...
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Help string `json:"help"`
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Help string `json:"help"`
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// IgnoreCase indicates if the case is sensitive to case or not
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IgnoreCase bool `json:"ignorecase"`
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IgnoreCase bool `json:"ignorecase"`
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// ValidatorRegexp extracts a subset of the player's answer, that will be checked.
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ValidatorRegexp *string `json:"validator_regexp"`
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// Checksum is the expected hashed flag
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Checksum []byte `json:"value"`
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Checksum []byte `json:"value"`
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}
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// GetFlags returns a list of flags comming with the challenge.
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func (e Exercice) GetFlags() ([]Flag, error) {
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if rows, err := DBQuery("SELECT id_flag, id_exercice, type, help, ignorecase, cksum FROM exercice_flags WHERE id_exercice = ?", e.Id); err != nil {
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if rows, err := DBQuery("SELECT id_flag, id_exercice, type, help, ignorecase, validator_regexp, cksum FROM exercice_flags WHERE id_exercice = ?", e.Id); err != nil {
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return nil, err
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} else {
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defer rows.Close()
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@ -34,9 +38,10 @@ func (e Exercice) GetFlags() ([]Flag, error) {
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var k Flag
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k.IdExercice = e.Id
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if err := rows.Scan(&k.Id, &k.IdExercice, &k.Label, &k.Help, &k.IgnoreCase, &k.Checksum); err != nil {
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if err := rows.Scan(&k.Id, &k.IdExercice, &k.Label, &k.Help, &k.IgnoreCase, &k.ValidatorRegexp, &k.Checksum); err != nil {
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return nil, err
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}
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flags = append(flags, k)
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}
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if err := rows.Err(); err != nil {
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@ -48,31 +53,59 @@ func (e Exercice) GetFlags() ([]Flag, error) {
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}
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// getHashedFlag calculates the expected checksum for the given raw_value.
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func getHashedFlag(raw_value string) [blake2b.Size]byte {
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hash := blake2b.Sum512([]byte(raw_value))
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func getHashedFlag(raw_value []byte) [blake2b.Size]byte {
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hash := blake2b.Sum512(raw_value)
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return hash
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}
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// AddRawFlag creates and fills a new struct Flag, from a non-hashed flag, and registers it into the database.
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func (e Exercice) AddRawFlag(name string, help string, ignorecase bool, raw_value string) (Flag, error) {
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func (e Exercice) AddRawFlag(name string, help string, ignorecase bool, validator_regexp *string, raw_value []byte) (Flag, error) {
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if ignorecase {
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raw_value = bytes.ToLower(raw_value)
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}
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// Check that raw value passes through the regexp
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if validator_regexp != nil {
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if re, err := regexp.Compile(*validator_regexp); err != nil {
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return Flag{}, err
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} else if res := re.FindSubmatch(raw_value); res == nil {
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return Flag{}, errors.New("Expected flag doesn't pass through the validator_regexp")
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} else {
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raw_value = bytes.Join(res[1:], []byte("+"))
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}
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}
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hash := getHashedFlag(raw_value)
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return e.AddFlag(name, help, ignorecase, hash[:])
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return e.AddFlag(name, help, ignorecase, validator_regexp, hash[:])
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}
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// AddFlag creates and fills a new struct Flag, from a hashed flag, and registers it into the database.
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func (e Exercice) AddFlag(name string, help string, ignorecase bool, checksum []byte) (Flag, error) {
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if res, err := DBExec("INSERT INTO exercice_flags (id_exercice, type, help, ignorecase, cksum) VALUES (?, ?, ?, ?, ?)", e.Id, name, help, ignorecase, checksum); err != nil {
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func (e Exercice) AddFlag(name string, help string, ignorecase bool, validator_regexp *string, checksum []byte) (Flag, error) {
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// Check the regexp compile
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if validator_regexp != nil {
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if _, err := regexp.Compile(*validator_regexp); err != nil {
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return Flag{}, err
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}
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}
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if res, err := DBExec("INSERT INTO exercice_flags (id_exercice, type, help, ignorecase, validator_regexp, cksum) VALUES (?, ?, ?, ?, ?, ?)", e.Id, name, help, ignorecase, validator_regexp, checksum); err != nil {
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return Flag{}, err
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} else if kid, err := res.LastInsertId(); err != nil {
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return Flag{}, err
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} else {
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return Flag{kid, e.Id, name, help, ignorecase, checksum}, nil
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return Flag{kid, e.Id, name, help, ignorecase, validator_regexp, checksum}, nil
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}
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}
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// Update applies modifications back to the database.
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func (k Flag) Update() (int64, error) {
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if res, err := DBExec("UPDATE exercice_flags SET id_exercice = ?, type = ?, help = ?, ignorecase = ?, cksum = ? WHERE id_flag = ?", k.IdExercice, k.Label, k.Help, k.IgnoreCase, k.Checksum, k.Id); err != nil {
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if k.ValidatorRegexp != nil {
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if _, err := regexp.Compile(*k.ValidatorRegexp); err != nil {
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return 0, err
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}
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}
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if res, err := DBExec("UPDATE exercice_flags SET id_exercice = ?, type = ?, help = ?, ignorecase = ?, validator_regexp = ?, cksum = ? WHERE id_flag = ?", k.IdExercice, k.Label, k.Help, k.IgnoreCase, k.ValidatorRegexp, k.Checksum, k.Id); err != nil {
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return 0, err
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} else if nb, err := res.RowsAffected(); err != nil {
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return 0, err
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@ -108,7 +141,24 @@ func (e Exercice) WipeFlags() (int64, error) {
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}
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// Check if the given val is the expected one for this flag.
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func (k Flag) Check(val string) bool {
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func (k Flag) Check(val []byte) bool {
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if k.IgnoreCase {
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val = bytes.ToLower(val)
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}
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// Check that raw value passes through the regexp
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if k.ValidatorRegexp != nil {
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re := regexp.MustCompile(*k.ValidatorRegexp)
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if res := re.FindSubmatch(val); res != nil {
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val = bytes.Join(res[1:], []byte("+"))
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}
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}
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// Check that the value is not empty
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if len(val) == 0 {
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return false
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}
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hash := getHashedFlag(val)
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if len(k.Checksum) != len(hash) {
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return false
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