commit b9d0aca7b4a3423b647fa831a61d45fbc1d05aa3 Author: William Petit Date: Thu Dec 7 19:54:47 2023 +0100 feat: initial commit diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..6e0382c --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,5 @@ +{ + "markdown.marp.themes": [ + "./themes/cadoles/theme.css" + ] +} \ No newline at end of file diff --git a/NOTES.md b/NOTES.md new file mode 100644 index 0000000..4a6785b --- /dev/null +++ b/NOTES.md @@ -0,0 +1,58 @@ +``` +npx http-server . +``` + +```js +const challenge = Uint8Array.from("myserverchallenge", c => c.charCodeAt(0)) + +const userId = Uint8Array.from("myuserid", c => c.charCodeAt(0)) + +const options = { + challenge, + rp: { + name: "localhost", + id: "localhost", + }, + user: { + id: userId, + name: "myuser", + displayName: "John Doe", + }, + pubKeyCredParams: [{alg: -7, type: "public-key"}], + authenticatorSelection: { + authenticatorAttachment: "cross-platform", + }, + timeout: 60000, + attestation: "direct" +}; + +const credential = await navigator.credentials.create({ + publicKey: options +}); + + +var decoder = new TextDecoder() +decoder.decode(credential.response.clientDataJSON) + +CBOR.decode(credential.response.attestationObject) +``` + + +```js +const newChallenge = Uint8Array.from("myservernewchallenge", c => c.charCodeAt(0)) + +const assertionOptions = { + challenge: newChallenge, + allowCredentials: [ + { + id: credential.rawId, + type: 'public-key' + } + ], + timeout: 60000 +} + +navigator.credentials + .get({ publicKey: assertionOptions }) + +``` \ No newline at end of file diff --git a/SLIDES.md b/SLIDES.md new file mode 100644 index 0000000..002eb19 --- /dev/null +++ b/SLIDES.md @@ -0,0 +1,167 @@ +--- +marp: true +theme: cadoles +paginate: true +header: "DevFest 2023" +footer: '![Logo Cadoles](./images/cadoles-logo.png)' +--- + +## Dites au revoir aux mots de passe avec WebAuthn ! + +_William Petit_ + +--- + +## Avant de commencer + +- S.C.O.P. dijonnaise de 14 personnes, depuis 2011 +- Spécialisée dans le logiciel libre + +![bg right:45%](images/logo_Cadoles_carre-sombre.svg) + +--- + +## Un peu de contexte + +![bg right:45%](./images/password_tag_cloud.png) + +- Je vous assure que c'est moi ! +- Le mot de passe, cet ami qu'on aimerait voir moins souvent +- Dupon-d ou Dupon-t ? + +--- + +## Qu'est ce que WebAuthn ? + +![bg right:45% height:60%](./images/webauthn-svgrepo-com.svg) + +- Une collaboration entre le W3C et l'alliance FIDO +- De l'authentification forte par paire de clés cryptographiques +- Authentification "sans mot de passe" ou vérification "double facteur" + +--- + +## Authentification par paire de clés cryptographiques ? (1) + +### Inscription + +![bg right:60% fit](./images/registration_workflow.svg) + +--- + +## Authentification par paire de clés cryptographiques ? (2) + +### Authentification + +![bg right:60% fit](./images/authentication_workflow.svg) + +--- + +## Passons à la technique + +Grâce à la [`Credential Management API`](https://developer.mozilla.org/en-US/docs/Web/API/Credential_Management_API) et notamment l'interface [`PublicKeyCredential`](https://developer.mozilla.org/en-US/docs/Web/API/PublicKeyCredential). + +--- + +### Générer une accréditation ("credential") + +```js +// Transformation du "challenge" récupéré depuis +// le serveur +const challenge = Uint8Array.from(challengeFromServer, c => c.charCodeAt(0)) + +// Récupération de l'identifiant "opaque" généré par le serveur (<= 64 octets) +const userId = Uint8Array.from(userIdFromServer, c => c.charCodeAt(0)) + +const credentialOptions = { + challenge, + rp: { // "Relying Party" + name: "Cadoles", // Nom associé au RP + id: "cadoles.com", // Identifiant (domaine) associé au RP + }, + user: { + id: userId, // Une séquence de données unique représentant l'utilisateur + name: "jdoe", // Nom d'utilisateur, spécifié (ou non) par le RP + displayName: "John Doe", // Nom d'utilisateur (pour affichage) + }, + pubKeyCredParams: [{alg: -7, type: "public-key"}], // Voir registre COSE, -7 = ES256 + authenticatorSelection: { + authenticatorAttachment: "cross-platform", // Privilégier un module matériel (YubiKey) plutôt que lié à la plaforme (TouchID) + }, + timeout: 60000, + attestation: "direct" // On demande à recevoir les données directement générées par l'authentificateur +}; + +const credential = await navigator.credentials.create({ + publicKey: credentialOptions +}); +``` +--- + +## Générer une affirmation ("assertion") + +```js +// On récupère le "challenge" à faire signer par le module d'authentification (envoyé normalement par le serveur) +const newChallenge = Uint8Array.from("myservernewchallenge", c => c.charCodeAt(0)) + +// On récupère l'identifiant de la clé associé à l'utilisateur (envoyé normalement par le serveur) +const keyRawId = Uint8Array.from("myuserkeyid", c => c.charCodeAt(0)) + +const assertionOptions = { + challenge: newChallenge, + allowCredentials: [ + { + id: keyRawId, + type: 'public-key' + } + ], + timeout: 60000 +} + +// On génère notre affirmation +navigator.credentials + .get({ publicKey: assertionOptions }) +``` + +--- + +## Et le côté serveur alors ? + +- Go - https://github.com/go-webauthn/webauthn +- TypeScript - https://github.com/passwordless-id/webauthn +- Ruby - https://github.com/cedarcode/webauthn-ruby + +--- + +## Quels pièges sur l'implémentation ? + +### Techniques + +- Jongler entre les formats (`string`, `ArrayBuffer`, `Uint8Array`...) et la sérialisation des données (`Base64`, `Base64URL`); +- Attention aux domaines (cf. `rp.id`); +- Automatisation des procédures de test encore complexe à ce jour. + +### UX + +- La procédure de récupération de compte doit être pensée dès l'amorçage du projet pour pallier à la perte de l'authentificateur; + +--- + +## Quels facteurs de risque ? + +- Ne pas essayer de ré-implémenter la partie serveur si vous pouvez utiliser une librairie maintenue par une communauté active (ou si vous êtes un véritable professionnel de la cryptographie); +- Pour limiter les risques de "lock-out", il faudrait pousser l'utilisateur à associer au minimum 2 authentificateurs avec son compte + +--- + +## Des questions ? + +--- + +## Bibliographie + +- https://informationisbeautiful.net/visualizations/top-500-passwords-visualized/ +- https://www.w3.org/TR/webauthn/ +- https://webauthn.guide/ +- https://fidoalliance.org/ +- https://www.iana.org/assignments/cose/cose.xhtml \ No newline at end of file diff --git a/SLIDES.pdf b/SLIDES.pdf new file mode 100644 index 0000000..2819c25 Binary files /dev/null and b/SLIDES.pdf differ diff --git a/SUMMARY.md b/SUMMARY.md new file mode 100644 index 0000000..cbfd8f8 --- /dev/null +++ b/SUMMARY.md @@ -0,0 +1,57 @@ +# Sommaire + +Diapositive 1 : Titre + +Titre : Introduction à WebAuthn +Sous-titre : Authentification sans mot de passe + +Diapositives 2-3 : Contexte + +Introduction à l'authentification en ligne +Problèmes liés aux mots de passe +Besoin d'une solution plus sécurisée + +Diapositives 4-5 : Introduction à WebAuthn + +Qu'est-ce que WebAuthn ? +Objectif : fournir une méthode d'authentification forte et sans mot de passe + +Diapositives 6-7 : Comment ça fonctionne ? + +Principes de fonctionnement de WebAuthn +Utilisation de clés matérielles et biométrie + +Diapositives 8-9 : Compatibilité et Support + +Compatibilité avec les navigateurs +Prise en charge sur différentes plateformes + +Diapositives 10-11 : Avantages de WebAuthn + +Sécurité accrue +Élimination des risques liés aux mots de passe + +Diapositives 12-13 : Cas d'utilisation + +Exemples de scénarios d'utilisation de WebAuthn +Applications pratiques dans divers contextes + +Diapositives 14-15 : Implémentation + +Processus d'implémentation pour les développeurs +Intégration dans les applications web existantes + +Diapositives 16-17 : Considérations de sécurité + +Points à prendre en compte pour garantir la sécurité +Bonnes pratiques d'implémentation + +Diapositive 18 : Adoption et Tendances + +Évolution de l'adoption de WebAuthn +Tendances futures dans l'authentification en ligne + +Diapositives 19-20 : Conclusion + +Récapitulation des avantages clés +Encouragement à l'adoption de WebAuthn diff --git a/images/authentication_workflow.mmd b/images/authentication_workflow.mmd new file mode 100644 index 0000000..9a9d655 --- /dev/null +++ b/images/authentication_workflow.mmd @@ -0,0 +1,9 @@ +sequenceDiagram + actor Utilisateur + Utilisateur->>Service: 1. Je voudrais m'authentifier en tant que $USERNAME ! + Service->>Service: 2. Recherche d'un utilisateur correspondant à $USERNAME
et ayant une clé publique associée. + Service->>Utilisateur: 3. Signe ce "challenge" avec la clé privée associée au compte $USERNAME. + Utilisateur->>Utilisateur: 4. Signature du "challenge" avec la clé privée. + Utilisateur->>Service: 5. Voici le "challenge" signé avec ma clé privée. + Service->>Service: 6. Vérification que le "challenge" signé correspond bien à celui envoyé
et que la signature correspond bien à la clé publique associée au compte $USERNAME. + Service->>Utilisateur: 7. Bonjour $USERNAME ! \ No newline at end of file diff --git a/images/authentication_workflow.svg b/images/authentication_workflow.svg new file mode 100644 index 0000000..52cea2d --- /dev/null +++ b/images/authentication_workflow.svg @@ -0,0 +1 @@ +ServiceServiceUtilisateur1. Je voudrais m'authentifier en tant que $USERNAME !2. Recherche d'un utilisateur correspondant à $USERNAME et ayant une clé publique associée.3. Signe ce "challenge" avec la clé privée associée au compte $USERNAME.4. Signature du "challenge" avec la clé privée.5. Voici le "challenge" signé avec ma clé privée.6. Vérification que le "challenge" signé correspond bien à celui envoyé et que la signature correspond bien à la clé publique associée au compte $USERNAME.7. Bonjour $USERNAME !Utilisateur \ No newline at end of file diff --git a/images/cadoles-logo.png b/images/cadoles-logo.png new file mode 100644 index 0000000..05230c2 Binary files /dev/null and b/images/cadoles-logo.png differ diff --git a/images/logo_Cadoles_carre-sombre.svg b/images/logo_Cadoles_carre-sombre.svg new file mode 100644 index 0000000..fa5bf90 --- /dev/null +++ b/images/logo_Cadoles_carre-sombre.svg @@ -0,0 +1,183 @@ + + + + + + + + + diff --git a/images/password_tag_cloud.png b/images/password_tag_cloud.png new file mode 100644 index 0000000..a20c9a4 Binary files /dev/null and b/images/password_tag_cloud.png differ diff --git a/images/registration_workflow.mmd b/images/registration_workflow.mmd new file mode 100644 index 0000000..d01162b --- /dev/null +++ b/images/registration_workflow.mmd @@ -0,0 +1,9 @@ +sequenceDiagram + actor Utilisateur + Utilisateur->>Service: 1. J'aimerais m'inscrire avec le compte $USERNAME ! + Service->>Utilisateur: 2. Bien sûr, génère une paire de clé cryptographique
et signe ce "challenge" avec ta clé privée ! + Utilisateur->>Service: 3. Voici ma clé publique et le "challenge" signé ! + Service->>Service: 4. Vérification que le "challenge" signé correspond bien au challenge envoyé. + Service->>Service: 5. Création du compte $USERNAME
et association de la clé publique avec celui ci. + Service->>Utilisateur: 6. Ton compte est bien créé
et ta clé publique associée à celui ci ! + \ No newline at end of file diff --git a/images/registration_workflow.svg b/images/registration_workflow.svg new file mode 100644 index 0000000..44f3c57 --- /dev/null +++ b/images/registration_workflow.svg @@ -0,0 +1 @@ +ServiceServiceUtilisateur1. J'aimerais m'inscrire avec le compte $USERNAME !2. Bien sûr, génère une paire de clé cryptographique et signe ce "challenge" avec ta clé privée !3. Voici ma clé publique et le "challenge" signé !4. Vérification que le "challenge" signé correspond bien au challenge envoyé.5. Création du compte $USERNAME et association de la clé publique avec celui ci.6. Ton compte est bien créé et ta clé publique associée à celui ci !Utilisateur \ No newline at end of file diff --git a/images/webauthn-svgrepo-com.svg b/images/webauthn-svgrepo-com.svg new file mode 100644 index 0000000..39fe027 --- /dev/null +++ b/images/webauthn-svgrepo-com.svg @@ -0,0 +1,44 @@ + + + + + + + WebAuthn icon + + diff --git a/index.html b/index.html new file mode 100644 index 0000000..9f37b0e --- /dev/null +++ b/index.html @@ -0,0 +1,5 @@ + + + + + \ No newline at end of file diff --git a/themes/cadoles/fonts/Roboto/LICENSE.txt b/themes/cadoles/fonts/Roboto/LICENSE.txt new file mode 100644 index 0000000..75b5248 --- /dev/null +++ b/themes/cadoles/fonts/Roboto/LICENSE.txt @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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