53 lines
2.2 KiB
TypeScript
53 lines
2.2 KiB
TypeScript
 
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// Shared helpers for `m.room.server_acl` server-name globs, used by both the
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// Room Settings ACL editor and the `/acl` slash command so their validation and
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// self-lockout detection stay identical.
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/**
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* Validate a server-name glob for an ACL entry.
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*
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* Matrix ACL `allow`/`deny` entries are globs where `*` (any run of chars) and
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* `?` (single char) may appear ANYWHERE — e.g. `*`, `*.example.com`,
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* `1.2.3.*`, `10.0.0.?`, `*.evil.*`, `*bad*`. We therefore validate the *glob*
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* rather than a concrete hostname:
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* - reject empty / whitespace-only
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* - allow only hostname/IP chars plus the wildcards `*` and `?`
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* (letters, digits, dots, hyphens, colons for ports/IPv6 — NO underscore)
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* - reject consecutive/leading/trailing dots (`...`, `.foo`, `foo.`)
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* - reject entries with no alphanumeric or wildcard char (bare `-`, lone `:`)
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*/
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export function isValidServerPattern(value: string): boolean {
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const v = value.trim();
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if (!v) return false;
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// Only hostname/IP glob chars — wildcards may appear at any position.
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if (!/^[A-Za-z0-9.:*?-]+$/.test(v)) return false;
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// Structural rules for the dotted parts.
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if (v.startsWith('.') || v.endsWith('.') || v.includes('..')) return false;
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// Must carry actual signal — reject pure punctuation like `-`, `:` or `-.-`.
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if (!/[A-Za-z0-9*?]/.test(v)) return false;
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return true;
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}
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/**
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* Convert an ACL glob (`*` = any run, `?` = single char) to an anchored RegExp,
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* escaping every other regex metacharacter. Used only for local self-ban
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* detection — never sent to the server.
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*/
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export function globToRegExp(glob: string): RegExp {
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const escaped = glob.replace(/[.+^${}()|[\]\\]/g, '\\$&');
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const pattern = escaped.replace(/\*/g, '.*').replace(/\?/g, '.');
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// Case-INsensitive: Synapse's glob_to_regex uses IGNORECASE and hostnames are
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// case-insensitive, so a deny like `MATRIX.foo.org` must still be detected as
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// self-banning `matrix.foo.org` (otherwise the warning is a false negative).
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return new RegExp(`^${pattern}$`, 'i');
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}
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export function matchesAnyGlob(domain: string, globs: string[]): boolean {
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return globs.some((glob) => {
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try {
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return globToRegExp(glob).test(domain);
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} catch {
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return false;
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}
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});
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}
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