@@ -0,0 +1,15 @@
+---
+'@objectstack/plugin-auth': patch
+---
+
+fix(plugin-auth): an IPv6 CIDR in the allowed IP ranges admits the IPv6 clients inside it, at the sign-in gate and at the settings save check
+
+Clause-②: no
+Metadata-protocol: none
+
+`auth.allowed_ip_ranges` (ADR-0069 D5) promises CIDR ranges, but its matcher read only IPv4 CIDR and exact addresses: an IPv6 entry such as `2001:db8::/32` was compared as text, so it never matched a real client. The sign-in gate then refused every IPv6 client the list named, and the settings save check refused the save for an administrator connected over IPv6 from inside it. `ipMatchesRange` now reads an IPv6 CIDR as the first `n` of 128 bits, and both doors use it, so they keep judging the same address the same way.
+
+- An exact IPv6 entry matches the address it denotes however it is spelled (`2001:DB8:0:0::1` matches `2001:db8::1`).
+- An IPv4-mapped address, dotted (`::ffff:203.0.113.5`) or hex (`::ffff:cb00:7105`), is still judged as the IPv4 address it maps. A zone identifier on an address (`fe80::1%eth0`) is dropped before matching.
+- Families never cross: an IPv4 range never admits a pure IPv6 address, and an IPv6 range never admits an IPv4 one.
+- An IPv6 prefix must be a whole number from 0 to 128. An entry with any other prefix matches only its base address, as it did before. IPv4 entries are read exactly as before.
@@ -229,3 +229,31 @@ describe('#30203 the recovery the refusal names', () => {
     expect(recovered.manager.isClientIpAllowed('::1')).toBe(true);
   });
 });
+
+describe('#30320 an IPv6 range is judged at both doors as the range it names', () => {
+  const OFFICE_V6 = '2001:db8:1200::/40';
+
+  it('the sign-in gate admits an IPv6 client inside an allowed IPv6 range and refuses one outside', async () => {
+    const { svc, manager } = await boot();
+    await svc.set('auth', 'allowed_ip_ranges', OFFICE_V6, {});
+    await vi.waitFor(() => expect(manager.isClientIpAllowed('::1')).toBe(false));
+    expect(manager.isClientIpAllowed('2001:db8:1234::7')).toBe(true);
+    expect(manager.isClientIpAllowed('2001:db8:1300::7')).toBe(false);
+    expect(manager.isClientIpAllowed('203.0.113.7')).toBe(false);
+  });
+
+  it('a save from an IPv6 address inside the range is stored, and one from outside is refused', async () => {
+    const { svc, manager, save } = await boot();
+    const outside = await save({ allowed_ip_ranges: OFFICE_V6 }, { remoteAddress: '2001:db8:1300::7' });
+    expect(outside.status).toBe(400);
+    expect(outside.body.error.code).toBe('SETTINGS_VALIDATION');
+    expect(outside.body.error.details.fields[0].constraint).toEqual({ clientAddress: '2001:db8:1300::7' });
+    expect(await stored(svc)).toBeNull();
+
+    const inside = await save({ allowed_ip_ranges: OFFICE_V6 }, { remoteAddress: '2001:db8:1234::7' });
+    expect(inside.status).toBe(200);
+    expect(await stored(svc)).toBe(OFFICE_V6);
+    await vi.waitFor(() => expect(manager.isClientIpAllowed('::1')).toBe(false));
+    expect(manager.isClientIpAllowed('2001:db8:1234::7')).toBe(true);
+  });
+});
@@ -5082,6 +5082,58 @@ describe('AuthManager', () => {
       expect(ipMatchesRange('2001:db8::1', '2001:db8::1')).toBe(true);
     });
 
+    it('ipMatchesRange reads an IPv6 CIDR as the 128-bit prefix it names', () => {
+      expect(ipMatchesRange('2001:db8::5', '2001:db8::/32')).toBe(true);
+      expect(ipMatchesRange('2001:db8:ffff:ffff:ffff:ffff:ffff:ffff', '2001:db8::/32')).toBe(true);
+      expect(ipMatchesRange('2001:db9::5', '2001:db8::/32')).toBe(false);
+      expect(ipMatchesRange('2001:0DB8:0:0::5', '2001:db8::/32')).toBe(true);
+      expect(ipMatchesRange('2001:db8:1234:5600::1', '2001:db8:1234:5600::/56')).toBe(true);
+      expect(ipMatchesRange('2001:db8:1234:5700::1', '2001:db8:1234:5600::/56')).toBe(false);
+      expect(ipMatchesRange('2001:db8::1', '2001:db8::1/128')).toBe(true);
+      expect(ipMatchesRange('2001:db8::2', '2001:db8::1/128')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', '::/0')).toBe(true);
+      expect(ipMatchesRange('::1', '::1/128')).toBe(true);
+      expect(ipMatchesRange('::2', '::1/128')).toBe(false);
+      // A zone identifier names an interface, not an address: the address is judged.
+      expect(ipMatchesRange('fe80::1%eth0', 'fe80::/10')).toBe(true);
+    });
+
+    it('ipMatchesRange compares an exact IPv6 entry by the address it denotes, not by its spelling', () => {
+      expect(ipMatchesRange('2001:db8::1', '2001:DB8:0:0:0:0:0:1')).toBe(true);
+      expect(ipMatchesRange('::1', '0:0:0:0:0:0:0:1')).toBe(true);
+      expect(ipMatchesRange('2001:db8::2', '2001:db8::1')).toBe(false);
+    });
+
+    it('ipMatchesRange never matches across address families', () => {
+      // An IPv4 range never admits a pure IPv6 address, an IPv6 range never an IPv4 one.
+      expect(ipMatchesRange('::1', '0.0.0.0/0')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', '0.0.0.0/0')).toBe(false);
+      expect(ipMatchesRange('203.0.113.5', '::/0')).toBe(false);
+      expect(ipMatchesRange('::ffff:203.0.113.5', '::/0')).toBe(false);
+      // The IPv4-mapped form, dotted or hex, is still the IPv4 address it maps.
+      expect(ipMatchesRange('::ffff:cb00:7105', '203.0.113.0/24')).toBe(true);
+      expect(ipMatchesRange('203.0.113.5', '::ffff:203.0.113.0/24')).toBe(true);
+      expect(ipMatchesRange('203.0.114.5', '::ffff:203.0.113.0/24')).toBe(false);
+    });
+
+    it('ipMatchesRange never widens a malformed IPv6 range past its base address', () => {
+      expect(ipMatchesRange('2001:db8::5', '2001:db8::/129')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', '2001:db8::/')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', '2001:db8::/3x')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', '2001:db8:::/32')).toBe(false);
+      expect(ipMatchesRange('2001:db8::5', 'zz01:db8::/32')).toBe(false);
+      // A prefix the family does not read leaves the base address alone, as before.
+      expect(ipMatchesRange('2001:db8::', '2001:db8::/129')).toBe(true);
+    });
+
+    it('isClientIpAllowed admits an IPv6 client inside an allowed IPv6 range', () => {
+      const m = mgr({ allowedIpRanges: ['2001:db8::/32', '::1'] });
+      expect(m.isClientIpAllowed('2001:db8:abcd::1')).toBe(true);
+      expect(m.isClientIpAllowed('::1')).toBe(true);
+      expect(m.isClientIpAllowed('2001:db9::1')).toBe(false);
+      expect(m.isClientIpAllowed('203.0.113.5')).toBe(false);
+    });
+
     it('resolveClientAddress believes forwarded headers only under trustProxy', () => {
       const headers = { 'x-forwarded-for': '203.0.113.9, 10.0.0.2' };
       expect(mgr({}).resolveClientAddress({ headers, remoteAddress: '10.0.0.2' })).toBe('10.0.0.2');
 
@@ -1174,40 +1174,76 @@ function ipv4ToInt(ip: string): number | null {
 }
 
 /**
- * `::ffff:203.0.113.7` → `203.0.113.7`; anything else is returned trimmed.
- *
- * A dual-stack listener reports an IPv4 peer in this IPv4-mapped IPv6 form, and
- * the ADR-0069 D5 allow-list judges the transport's peer address when no proxy
- * is trusted. So both sides of a comparison are read as the IPv4 address they
- * denote, or an IPv4 range could never admit an IPv4 client on such a socket.
+ * An address as the ADR-0069 D5 matcher compares it: an IPv4 address as a
+ * uint32, any other IPv6 address as its eight 16-bit groups, or `null` when
+ * the text is neither. An IPv4-mapped IPv6 address (`::ffff:0:0/96`, dotted
+ * or hex) is the IPv4 address it maps: a dual-stack listener reports an IPv4
+ * peer in that form, and the allow-list judges the transport's peer address
+ * when no proxy is trusted, so an IPv4 range must admit an IPv4 client on such
+ * a socket. An IPv6 zone identifier (`%eth0`) is dropped: it names the
+ * interface the address was reached on, not the address.
  */
-function unmapIpv4(address: string): string {
-  const trimmed = address.trim();
-  const mapped = /^::ffff:(\d{1,3}(?:\.\d{1,3}){3})$/i.exec(trimmed);
-  return mapped ? mapped[1] : trimmed;
+type MatchedAddress = { v4: number } | { v6: number[] };
+
+function readMatchedAddress(text: string): MatchedAddress | null {
+  const trimmed = text.trim();
+  const v4 = ipv4ToInt(trimmed);
+  if (v4 !== null) return { v4 };
+  const zoneAt = trimmed.indexOf('%');
+  const groups = parseIpv6Literal((zoneAt === -1 ? trimmed : trimmed.slice(0, zoneAt)).toLowerCase());
+  if (!groups) return null;
+  if (groups.slice(0, 5).every((g) => g === 0) && groups[5] === 0xffff) {
+    return { v4: ((groups[6]! << 16) >>> 0) + groups[7]! };
+  }
+  return { v6: groups };
+}
+
+/** Do the first `bits` bits of two eight-group IPv6 addresses agree? */
+function ipv6PrefixEqual(a: readonly number[], b: readonly number[], bits: number): boolean {
+  for (let i = 0; i < 8 && bits > 0; i++, bits -= 16) {
+    const mask = bits >= 16 ? 0xffff : (0xffff << (16 - bits)) & 0xffff;
+    if ((a[i]! & mask) !== (b[i]! & mask)) return false;
+  }
+  return true;
 }
 
 /**
- * ADR-0069 D5 — does `ip` match `range` (IPv4 CIDR `a.b.c.d/n`, or exact IP)?
- * An IPv4-mapped IPv6 address on either side compares as its IPv4 address.
+ * ADR-0069 D5 — does `ip` match `range`? A range is an IPv4 CIDR
+ * (`a.b.c.d/n`), an IPv6 CIDR (`2001:db8::/32`: the first `n` of 128 bits),
+ * or one exact address. Both sides are read as the address they denote
+ * ({@link readMatchedAddress}), so an IPv4-mapped IPv6 address on either side
+ * compares as its IPv4 address, and an exact IPv6 entry matches however it is
+ * spelled. An address is matched only against a range of its own family: an
+ * IPv4 range never admits a pure IPv6 address, nor an IPv6 range an IPv4 one.
+ *
+ * A CIDR whose prefix is not one the family reads (an IPv6 prefix must be a
+ * whole number from 0 to 128) is read as its base address alone, and any
+ * other entry that is not an address is compared as text, which an address
+ * the server established never equals. The IPv4 prefix keeps its earlier
+ * reading (`Number`, 0 to 32).
+ *
+ * One matcher for every door that judges the list: the sign-in gate
+ * ({@link AuthManager.isClientIpAllowed}) and the settings save check
+ * (`allowed-ip-ranges.ts`) must judge the same address the same way.
  */
 export function ipMatchesRange(ip: string, range: string): boolean {
-  const r = unmapIpv4(range || '');
+  const r = (range || '').trim();
   if (!r) return false;
-  const address = unmapIpv4(ip);
-  if (r.includes('/')) {
-    const [rawBase, bitsStr] = r.split('/');
-    const base = unmapIpv4(rawBase);
-    const bits = Number(bitsStr);
-    const ipInt = ipv4ToInt(address);
-    const baseInt = ipv4ToInt(base);
-    if (ipInt === null || baseInt === null || !(bits >= 0 && bits <= 32)) {
-      return address === base; // non-IPv4-CIDR → exact-match fallback
-    }
+  const address = readMatchedAddress(ip);
+  const [rawBase, bitsStr] = r.split('/');
+  const base = readMatchedAddress(rawBase!);
+  if (!base || !address) return ip.trim() === rawBase!.trim();
+  if ('v4' in base) {
+    if (!('v4' in address)) return false;
+    const bits = bitsStr === undefined ? 32 : Number(bitsStr);
+    if (!(bits >= 0 && bits <= 32)) return address.v4 === base.v4; // not an IPv4 prefix → exact base
     const mask = bits === 0 ? 0 : (~0 << (32 - bits)) >>> 0;
-    return ((ipInt & mask) >>> 0) === ((baseInt & mask) >>> 0);
+    return ((address.v4 & mask) >>> 0) === ((base.v4 & mask) >>> 0);
   }
-  return address === r;
+  if (!('v6' in address)) return false;
+  const prefix = bitsStr === undefined ? '128' : bitsStr.trim();
+  const bits = /^\d{1,3}$/.test(prefix) && Number(prefix) <= 128 ? Number(prefix) : 128; // not an IPv6 prefix → exact base
+  return ipv6PrefixEqual(address.v6, base.v6, bits);
 }
 
 /**
@@ -5893,7 +5929,7 @@ export class AuthManager {
    * only for an address inside one of them, and FALSE for an undetermined
    * address (`undefined` / empty): an allow-list is a gate, and a gate that
    * opens for "unknown" is open to anyone who can make themselves unknown.
-   * Supports IPv4 CIDR + exact IPv4/IPv6 (IPv4-mapped IPv6 compares as IPv4).
+   * Supports IPv4 and IPv6 CIDR + exact IPv4/IPv6 ({@link ipMatchesRange}).
    *
    * `ip` must be the address the server established
    * ({@link resolveClientAddress}), never a header read by the caller.
 
@@ -31,9 +31,9 @@
  *
  * That module is a published entry the runtime's inbound rate limiter loads,
  * and it is kept free of imports; this one needs `node:net`. The trust rule
- * also feeds the ADR-0069 D5 allow-list, which compares exact IPv6 entries as
- * text, so rewriting the rule's own answer would change which configured
- * entries match. This module changes only what is stored.
+ * also feeds the ADR-0069 D5 allow-list (`ipMatchesRange`), which reads each
+ * entry and the address as the address they denote, whatever their spelling.
+ * This module changes only what is stored.
  *
  * ## The form
  *
Original file line number	Diff line number	Diff line change
`@@ -31,9 +31,9 @@`
`31`	`31`	`*`
`32`	`32`	`* That module is a published entry the runtime's inbound rate limiter loads,`
`33`	`33`	* and it is kept free of imports; this one needs `node:net`. The trust rule
`34`		`- * also feeds the ADR-0069 D5 allow-list, which compares exact IPv6 entries as`
`35`		`- * text, so rewriting the rule's own answer would change which configured`
`36`		`- * entries match. This module changes only what is stored.`
	`34`	+ * also feeds the ADR-0069 D5 allow-list (`ipMatchesRange`), which reads each
	`35`	`+ * entry and the address as the address they denote, whatever their spelling.`
	`36`	`+ * This module changes only what is stored.`
`37`	`37`	`*`
`38`	`38`	`* ## The form`
`39`	`39`	`*`