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Block IPv4-compatible IPv6 feed URLs #32

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Block IPv4-compatible IPv6 feed URLs #32

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1 change: 1 addition & 0 deletions plugins/feed-discovery/src/feed-discovery.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ describe("site probing helpers", () => {
await expect(assertSafeHttpUrl("http://127.0.0.1/feed")).rejects.toThrow(/Blocked internal/);
await expect(assertSafeHttpUrl("http://[::]/feed")).rejects.toThrow(/Blocked internal/);
await expect(assertSafeHttpUrl("http://[::ffff:192.168.1.10]/feed")).rejects.toThrow(/Blocked internal/);
await expect(assertSafeHttpUrl("http://[::192.168.1.10]/feed")).rejects.toThrow(/Blocked internal/);
await expect(assertSafeHttpUrl("file:///etc/passwd")).rejects.toThrow(/Unsupported URL protocol/);
});
});
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10 changes: 10 additions & 0 deletions plugins/feed-discovery/src/url-safety.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,16 @@ function isBlockedIp(value: string) {

if (kind === 6) {
const normalized = value.toLowerCase();
const compatibleDottedIpv4 = /^::(\d+\.\d+\.\d+\.\d+)$/.exec(normalized);
if (compatibleDottedIpv4) {
return isBlockedIp(compatibleDottedIpv4[1]);
}
const compatibleHexIpv4 = /^::([0-9a-f]{1,4}):([0-9a-f]{1,4})$/.exec(normalized);
if (compatibleHexIpv4) {
const high = Number.parseInt(compatibleHexIpv4[1], 16);
const low = Number.parseInt(compatibleHexIpv4[2], 16);
return isBlockedIp(`${high >> 8}.${high & 255}.${low >> 8}.${low & 255}`);
}
const mappedDottedIpv4 = /^::ffff:(\d+\.\d+\.\d+\.\d+)$/.exec(normalized);
if (mappedDottedIpv4) {
return isBlockedIp(mappedDottedIpv4[1]);
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