2016-01-13 19:25:25 +00:00
|
|
|
package fic
|
2016-01-07 17:43:02 +00:00
|
|
|
|
|
|
|
import (
|
2016-12-04 18:08:46 +00:00
|
|
|
"time"
|
2017-11-24 19:08:14 +00:00
|
|
|
|
2018-02-03 01:03:08 +00:00
|
|
|
"golang.org/x/crypto/blake2b"
|
2016-01-07 17:43:02 +00:00
|
|
|
)
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
|
|
|
|
// Key represents a flag's challenge, stored as hash.
|
2016-01-07 17:43:02 +00:00
|
|
|
type Key struct {
|
2017-12-04 07:40:17 +00:00
|
|
|
Id int64 `json:"id"`
|
2018-03-09 18:07:08 +00:00
|
|
|
// IdExercice is the identifier of the underlying challenge
|
2017-12-04 07:40:17 +00:00
|
|
|
IdExercice int64 `json:"idExercice"`
|
2018-03-09 18:07:08 +00:00
|
|
|
// Label is the title of the flag as displayed to players
|
2018-01-07 23:17:46 +00:00
|
|
|
Label string `json:"label"`
|
2018-03-09 18:07:08 +00:00
|
|
|
// Checksum is the expected hashed flag
|
2017-12-04 07:40:17 +00:00
|
|
|
Checksum []byte `json:"value"`
|
2016-01-07 17:43:02 +00:00
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// GetKeys returns a list of flags comming with the challenge.
|
2016-01-07 17:43:02 +00:00
|
|
|
func (e Exercice) GetKeys() ([]Key, error) {
|
2017-11-24 19:08:14 +00:00
|
|
|
if rows, err := DBQuery("SELECT id_key, id_exercice, type, cksum FROM exercice_keys WHERE id_exercice = ?", e.Id); err != nil {
|
2016-01-07 17:43:02 +00:00
|
|
|
return nil, err
|
|
|
|
} else {
|
|
|
|
defer rows.Close()
|
|
|
|
|
|
|
|
var keys = make([]Key, 0)
|
|
|
|
for rows.Next() {
|
|
|
|
var k Key
|
2016-01-13 00:20:21 +00:00
|
|
|
k.IdExercice = e.Id
|
2016-01-19 12:09:36 +00:00
|
|
|
|
2017-12-12 04:06:34 +00:00
|
|
|
if err := rows.Scan(&k.Id, &k.IdExercice, &k.Label, &k.Checksum); err != nil {
|
2016-01-07 17:43:02 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
keys = append(keys, k)
|
|
|
|
}
|
|
|
|
if err := rows.Err(); err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return keys, nil
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// getHashedKey calculates the expected checksum for the given raw_value.
|
2018-02-03 01:03:08 +00:00
|
|
|
func getHashedKey(raw_value string) [blake2b.Size]byte {
|
2017-11-24 19:08:14 +00:00
|
|
|
hash := blake2b.Sum512([]byte(raw_value))
|
|
|
|
return hash
|
2016-01-15 11:57:35 +00:00
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// AddRawKey creates and fills a new struct Key, from a non-hashed flag, and registers it into the database.
|
2016-01-07 17:43:02 +00:00
|
|
|
func (e Exercice) AddRawKey(name string, raw_value string) (Key, error) {
|
2017-12-04 07:40:17 +00:00
|
|
|
hash := getHashedKey(raw_value)
|
|
|
|
return e.AddKey(name, hash[:])
|
2016-01-07 17:43:02 +00:00
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// AddKey creates and fills a new struct Key, from a hashed flag, and registers it into the database.
|
2017-12-04 07:40:17 +00:00
|
|
|
func (e Exercice) AddKey(name string, checksum []byte) (Key, error) {
|
|
|
|
if res, err := DBExec("INSERT INTO exercice_keys (id_exercice, type, cksum) VALUES (?, ?, ?)", e.Id, name, checksum); err != nil {
|
2016-01-07 17:43:02 +00:00
|
|
|
return Key{}, err
|
|
|
|
} else if kid, err := res.LastInsertId(); err != nil {
|
|
|
|
return Key{}, err
|
|
|
|
} else {
|
2017-12-04 07:40:17 +00:00
|
|
|
return Key{kid, e.Id, name, checksum}, nil
|
2016-01-07 17:43:02 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// Update applies modifications back to the database.
|
2016-01-07 17:43:02 +00:00
|
|
|
func (k Key) Update() (int64, error) {
|
2017-12-12 04:06:34 +00:00
|
|
|
if res, err := DBExec("UPDATE exercice_keys SET id_exercice = ?, type = ?, cksum = ? WHERE id_key = ?", k.IdExercice, k.Label, k.Checksum, k.Id); err != nil {
|
2016-01-07 17:43:02 +00:00
|
|
|
return 0, err
|
|
|
|
} else if nb, err := res.RowsAffected(); err != nil {
|
|
|
|
return 0, err
|
|
|
|
} else {
|
|
|
|
return nb, err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// Delete the flag from the database.
|
2016-01-07 17:43:02 +00:00
|
|
|
func (k Key) Delete() (int64, error) {
|
2016-01-13 00:20:21 +00:00
|
|
|
if res, err := DBExec("DELETE FROM exercice_keys WHERE id_key = ?", k.Id); err != nil {
|
2016-01-07 17:43:02 +00:00
|
|
|
return 0, err
|
|
|
|
} else if nb, err := res.RowsAffected(); err != nil {
|
|
|
|
return 0, err
|
|
|
|
} else {
|
|
|
|
return nb, err
|
|
|
|
}
|
|
|
|
}
|
2016-01-15 11:57:35 +00:00
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// WipeKeys deletes keys coming with the challenge.
|
2017-12-08 23:52:43 +00:00
|
|
|
func (e Exercice) WipeKeys() (int64, error) {
|
|
|
|
if res, err := DBExec("DELETE FROM exercice_keys WHERE id_exercice = ?", e.Id); err != nil {
|
|
|
|
return 0, err
|
|
|
|
} else if nb, err := res.RowsAffected(); err != nil {
|
|
|
|
return 0, err
|
|
|
|
} else {
|
|
|
|
return nb, err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// Check if the given val is the expected one for this flag.
|
2016-01-15 11:57:35 +00:00
|
|
|
func (k Key) Check(val string) bool {
|
2016-01-19 12:09:36 +00:00
|
|
|
hash := getHashedKey(val)
|
2017-12-04 07:40:17 +00:00
|
|
|
if len(k.Checksum) != len(hash) {
|
2016-01-19 12:09:36 +00:00
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
for i := range hash {
|
2017-12-04 07:40:17 +00:00
|
|
|
if k.Checksum[i] != hash[i] {
|
2016-01-19 12:09:36 +00:00
|
|
|
return false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return true
|
2016-01-15 11:57:35 +00:00
|
|
|
}
|
2016-12-04 18:08:46 +00:00
|
|
|
|
2018-03-09 18:07:08 +00:00
|
|
|
// FoundBy registers in the database that the given Team solved the flag.
|
2016-12-04 18:08:46 +00:00
|
|
|
func (k Key) FoundBy(t Team) {
|
|
|
|
DBExec("INSERT INTO key_found (id_key, id_team, time) VALUES (?, ?, ?)", k.Id, t.Id, time.Now())
|
|
|
|
}
|