[Servatrice] Match trusted_sources by address, not substring (#7582)

trusted_sources was checked with QString::contains. A dual-stack listener
reports a local proxy as ::ffff:127.0.0.1, which never matches the default
"127.0.0.1,::1". Behind nginx the forwarded client IP header was then
ignored, every websocket user shared the proxy's address, and logins
failed with "too many concurrent connections" once max_users_per_address
was reached.

Add isTrustedSource(), which parses each entry as a QHostAddress and
compares exact addresses with IPv4-mapped addresses normalized, and use it
at all four call sites. The ban command also read server/trusted_sources
instead of the documented security/trusted_sources; it now uses the same
getter. Entries that are not IP addresses are logged at startup since they
no longer match anything.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Zach H 2026-10-18 16:50:04 -04:00 • committed by GitHub
parent 4343544588
commit 46cdbac830
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9 changed files with 136 additions and 9 deletions

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#ifndef TRUSTED_SOURCES_H
#define TRUSTED_SOURCES_H
#include <QHostAddress>
#include <QString>
/**
* @brief True if @p address is listed in the comma-separated @p trustedSources (security/trusted_sources).
*
* Entries are parsed as addresses and compared exactly, never as substrings, so
* 27.0.0.1 does not match 127.0.0.1. IPv4-mapped IPv6 addresses compare equal to
* their IPv4 form: a dual-stack listener reports a local proxy as ::ffff:127.0.0.1,
* which matches a 127.0.0.1 entry. Malformed entries and null addresses never match.
*/
bool isTrustedSource(const QString &trustedSources, const QHostAddress &address);
/** @brief Overload for an address in string form; an unparsable string never matches. */
bool isTrustedSource(const QString &trustedSources, const QString &address);
#endif