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and standard_conforming_strings. The encoding changes are needed for proper escaping in multibyte encodings, as per the SQL-injection vulnerabilities noted in CVE-2006-2313 and CVE-2006-2314. Concurrent fixes are being applied to the server to ensure that it rejects queries that may have been corrupted by attempted SQL injection, but this merely guarantees that unpatched clients will fail rather than allow injection. An actual fix requires changing the client-side code. While at it we have also fixed these routines to understand about standard_conforming_strings, so that the upcoming changeover to SQL-spec string syntax can be somewhat transparent to client code. Since the existing API of PQescapeString and PQescapeBytea provides no way to inform them which settings are in use, these functions are now deprecated in favor of new functions PQescapeStringConn and PQescapeByteaConn. The new functions take the PGconn to which the string will be sent as an additional parameter, and look inside the connection structure to determine what to do. So as to provide some functionality for clients using the old functions, libpq stores the latest encoding and standard_conforming_strings values received from the backend in static variables, and the old functions consult these variables. This will work reliably in clients using only one Postgres connection at a time, or even multiple connections if they all use the same encoding and string syntax settings; which should cover many practical scenarios. Clients that use homebrew escaping methods, such as PHP's addslashes() function or even hardwired regexp substitution, will require extra effort to fix :-(. It is strongly recommended that such code be replaced by use of PQescapeStringConn/PQescapeByteaConn if at all feasible. |
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