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2920a26636
Because the UID= and PWD= values are appended to the SQLDriverConnect case when credentials are passed, we have to append them to the string in case users are relying on this behaviour. However, they must be quoted, or the arguments will be invalid (or possibly more injected). This means users had to quote arguments or append credentials to the raw connection string themselves. It seems that ODBC quoting rules are consistent enough (and that Microsoft trusts them enough to encode into the .NET BCL) that we can actually check if the string is already quoted (in case a user is already quoting because of this not being fixed), and if not, apply the appropriate ODBC quoting rules. This is because the code exists in main/, and are shared between both ODBC extensions, so it doesn't make sense for it to only exist in one or the other. There may be a better spot for it. Closes GH-8307.
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Calvin Buckley <calvin@cmpct.info> |
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+----------------------------------------------------------------------+
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "php.h"
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/*
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* This files contains functions shared between ext/pdo_odbc and ext/odbc,
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* relating to i.e. connection string quoting rules.
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*
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* The declarations are PHPAPI due to being available for shared/static
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* versions.
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*/
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/**
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* Determines if a string matches the ODBC quoting rules.
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*
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* A valid quoted string begins with a '{', ends with a '}', and has no '}'
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* inside of the string that aren't repeated (as to be escaped).
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*
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* These rules are what .NET also follows.
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*/
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PHPAPI bool php_odbc_connstr_is_quoted(const char *str)
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{
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/* ODBC quotes are curly braces */
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if (str[0] != '{') {
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return false;
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}
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/* Check for } that aren't doubled up or at the end of the string */
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size_t length = strlen(str);
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for (size_t i = 0; i < length; i++) {
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if (str[i] == '}' && str[i + 1] == '}') {
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/* Skip over so we don't count it again */
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i++;
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} else if (str[i] == '}' && str[i + 1] != '\0') {
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/* If not at the end, not quoted */
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return false;
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}
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}
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return true;
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}
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/**
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* Determines if a value for a connection string should be quoted.
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*
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* The ODBC specification mentions:
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* "Because of connection string and initialization file grammar, keywords and
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* and attribute values that contain the characters []{}(),;?*=!@ not enclosed
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* with braces should be avoided."
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*
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* Note that it assumes that the string is *not* already quoted. You should
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* check beforehand.
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*/
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PHPAPI bool php_odbc_connstr_should_quote(const char *str)
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{
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return strpbrk(str, "[]{}(),;?*=!@") != NULL;
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}
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/**
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* Estimates the worst-case scenario for a quoted version of a string's size.
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*/
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PHPAPI size_t php_odbc_connstr_estimate_quote_length(const char *in_str)
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{
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/* Assume all '}'. Include '{,' '}', and the null terminator too */
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return (strlen(in_str) * 2) + 3;
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}
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/**
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* Quotes a string with ODBC rules.
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*
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* Some characters (curly braces, semicolons) are special and must be quoted.
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* In the case of '}' in a quoted string, they must be escaped SQL style; that
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* is, repeated.
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*/
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PHPAPI size_t php_odbc_connstr_quote(char *out_str, const char *in_str, size_t out_str_size)
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{
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*out_str++ = '{';
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out_str_size--;
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while (out_str_size > 2) {
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if (*in_str == '\0') {
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break;
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} else if (*in_str == '}' && out_str_size - 1 > 2) {
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/* enough room to append */
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*out_str++ = '}';
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*out_str++ = *in_str++;
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out_str_size -= 2;
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} else if (*in_str == '}') {
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/* not enough, truncate here */
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break;
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} else {
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*out_str++ = *in_str++;
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out_str_size--;
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}
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}
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/* append termination */
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*out_str++ = '}';
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*out_str++ = '\0';
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out_str_size -= 2;
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/* return how many characters were left */
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return strlen(in_str);
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}
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