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PKCE support for SSO #2806

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PKCE support for SSO #2806

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avdb13
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@avdb13 avdb13 commented Nov 12, 2024

Description

In continuation of LemmyNet/lemmy#4881.

Implements PKCE support, in order to mitigate against the threat of authorization code interception attacks.

Background reading: https://www.oauth.com/oauth2-servers/pkce

.replace(/=+$/, "");
}

export async function generatePKCE(): Promise<[string, string]> {
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Why not simply use base64url encoding on 96 random bytes instead of trying to use the whole PKCE_ALPHABET?

@@ -126,22 +127,30 @@ export async function handleUseOAuthProvider(params: {
const redirectUri = `${window.location.origin}/oauth/callback`;

const state = crypto.randomUUID();
const [code_challenge, code_verifier] = await generatePKCE();
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We should probably only generatePKCE if params.oauth_provider?.use_pkce is true

@avdb13 avdb13 force-pushed the pkce branch 2 times, most recently from d5c9f6c to c4bb7f6 Compare November 15, 2024 10:53
@avdb13 avdb13 force-pushed the pkce branch 3 times, most recently from 863ada6 to f1cafbf Compare November 24, 2024 00:07
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avdb13 commented Nov 24, 2024

Woodpecker failure due to lemmy-js-client.

@dessalines
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dessalines commented Nov 27, 2024

@avdb13 Okay I've deployed a version you can test: lemmy-js-client: 0.20.0-pkce.1

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Seems fine, but I'll mark as draft until the back end and lemmy-js-client PRs are merged.

@dessalines dessalines marked this pull request as draft November 27, 2024 17:45
@avdb13 avdb13 marked this pull request as ready for review November 28, 2024 00:56
@avdb13 avdb13 marked this pull request as draft November 28, 2024 00:58
@erlend-sh
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Backend and is-client PRs are merged:

@SleeplessOne1917
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Will take a closer look at this sometime this week.

@dessalines dessalines marked this pull request as ready for review February 11, 2025 14:43
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Thx. This is on us to fix lemmy-ui's broken main in the next few weeks, and we'll get this merged as a part of it.

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5 participants