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Code Editor : uspoof.h
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* *************************************************************************** * Copyright (C) 2008-2016, International Business Machines Corporation * and others. All Rights Reserved. *************************************************************************** * file name: uspoof.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 2008Feb13 * created by: Andy Heninger * * Unicode Spoof Detection */ #ifndef USPOOF_H #define USPOOF_H #include "unicode/ubidi.h" #include "unicode/utypes.h" #include "unicode/uset.h" #include "unicode/parseerr.h" #if !UCONFIG_NO_NORMALIZATION #if U_SHOW_CPLUSPLUS_API #include "unicode/localpointer.h" #include "unicode/unistr.h" #include "unicode/uniset.h" #endif /** * \file * \brief C API: Unicode Security and Spoofing Detection * * <p> * This class, based on <a href="http://unicode.org/reports/tr36">Unicode Technical Report #36</a> and * <a href="http://unicode.org/reports/tr39">Unicode Technical Standard #39</a>, has two main functions: * * <ol> * <li>Checking whether two strings are visually <em>confusable</em> with each other, such as "Harvest" and * "Ηarvest", where the second string starts with the Greek capital letter Eta.</li> * <li>Checking whether an individual string is likely to be an attempt at confusing the reader (<em>spoof * detection</em>), such as "paypal" with some Latin characters substituted with Cyrillic look-alikes.</li> * </ol> * * <p> * Although originally designed as a method for flagging suspicious identifier strings such as URLs, * <code>USpoofChecker</code> has a number of other practical use cases, such as preventing attempts to evade bad-word * content filters. * * <p> * The functions of this class are exposed as C API, with a handful of syntactical conveniences for C++. * * <h2>Confusables</h2> * * <p> * The following example shows how to use <code>USpoofChecker</code> to check for confusability between two strings: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * UChar* str1 = (UChar*) u"Harvest"; * UChar* str2 = (UChar*) u"\u0397arvest"; // with U+0397 GREEK CAPITAL LETTER ETA * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status); * * int32_t bitmask = uspoof_areConfusable(sc, str1, -1, str2, -1, &status); * UBool result = bitmask != 0; * // areConfusable: 1 (status: U_ZERO_ERROR) * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status)); * uspoof_close(sc); * \endcode * * <p> * The call to {@link uspoof_open} creates a <code>USpoofChecker</code> object; the call to {@link uspoof_setChecks} * enables confusable checking and disables all other checks; the call to {@link uspoof_areConfusable} performs the * confusability test; and the following line extracts the result out of the return value. For best performance, * the instance should be created once (e.g., upon application startup), and the efficient * {@link uspoof_areConfusable} method can be used at runtime. * * If the paragraph direction used to display the strings is known, the bidi function should be used instead: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * // These strings look identical when rendered in a left-to-right context. * // They look distinct in a right-to-left context. * UChar* str1 = (UChar*) u"A1\u05D0"; // A1א * UChar* str2 = (UChar*) u"A\u05D01"; // Aא1 * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status); * * int32_t bitmask = uspoof_areBidiConfusable(sc, UBIDI_LTR, str1, -1, str2, -1, &status); * UBool result = bitmask != 0; * // areBidiConfusable: 1 (status: U_ZERO_ERROR) * printf("areBidiConfusable: %d (status: %s)\n", result, u_errorName(status)); * uspoof_close(sc); * \endcode * * <p> * The type {@link LocalUSpoofCheckerPointer} is exposed for C++ programmers. It will automatically call * {@link uspoof_close} when the object goes out of scope: * * \code{.cpp} * UErrorCode status = U_ZERO_ERROR; * LocalUSpoofCheckerPointer sc(uspoof_open(&status)); * uspoof_setChecks(sc.getAlias(), USPOOF_CONFUSABLE, &status); * // ... * \endcode * * UTS 39 defines two strings to be <em>confusable</em> if they map to the same <em>skeleton string</em>. A skeleton can * be thought of as a "hash code". {@link uspoof_getSkeleton} computes the skeleton for a particular string, so * the following snippet is equivalent to the example above: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * UChar* str1 = (UChar*) u"Harvest"; * UChar* str2 = (UChar*) u"\u0397arvest"; // with U+0397 GREEK CAPITAL LETTER ETA * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status); * * // Get skeleton 1 * int32_t skel1Len = uspoof_getSkeleton(sc, 0, str1, -1, NULL, 0, &status); * UChar* skel1 = (UChar*) malloc(++skel1Len * sizeof(UChar)); * status = U_ZERO_ERROR; * uspoof_getSkeleton(sc, 0, str1, -1, skel1, skel1Len, &status); * * // Get skeleton 2 * int32_t skel2Len = uspoof_getSkeleton(sc, 0, str2, -1, NULL, 0, &status); * UChar* skel2 = (UChar*) malloc(++skel2Len * sizeof(UChar)); * status = U_ZERO_ERROR; * uspoof_getSkeleton(sc, 0, str2, -1, skel2, skel2Len, &status); * * // Are the skeletons the same? * UBool result = u_strcmp(skel1, skel2) == 0; * // areConfusable: 1 (status: U_ZERO_ERROR) * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status)); * uspoof_close(sc); * free(skel1); * free(skel2); * \endcode * * If you need to check if a string is confusable with any string in a dictionary of many strings, rather than calling * {@link uspoof_areConfusable} many times in a loop, {@link uspoof_getSkeleton} can be used instead, as shown below: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * #define DICTIONARY_LENGTH 2 * UChar* dictionary[DICTIONARY_LENGTH] = { (UChar*) u"lorem", (UChar*) u"ipsum" }; * UChar* skeletons[DICTIONARY_LENGTH]; * UChar* str = (UChar*) u"1orern"; * * // Setup: * USpoofChecker* sc = uspoof_open(&status); * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status); * for (size_t i=0; i<DICTIONARY_LENGTH; i++) { * UChar* word = dictionary[i]; * int32_t len = uspoof_getSkeleton(sc, 0, word, -1, NULL, 0, &status); * skeletons[i] = (UChar*) malloc(++len * sizeof(UChar)); * status = U_ZERO_ERROR; * uspoof_getSkeleton(sc, 0, word, -1, skeletons[i], len, &status); * } * * // Live Check: * { * int32_t len = uspoof_getSkeleton(sc, 0, str, -1, NULL, 0, &status); * UChar* skel = (UChar*) malloc(++len * sizeof(UChar)); * status = U_ZERO_ERROR; * uspoof_getSkeleton(sc, 0, str, -1, skel, len, &status); * UBool result = false; * for (size_t i=0; i<DICTIONARY_LENGTH; i++) { * result = u_strcmp(skel, skeletons[i]) == 0; * if (result == true) { break; } * } * // Has confusable in dictionary: 1 (status: U_ZERO_ERROR) * printf("Has confusable in dictionary: %d (status: %s)\n", result, u_errorName(status)); * free(skel); * } * * for (size_t i=0; i<DICTIONARY_LENGTH; i++) { * free(skeletons[i]); * } * uspoof_close(sc); * \endcode * * <b>Note:</b> Since the Unicode confusables mapping table is frequently updated, confusable skeletons are <em>not</em> * guaranteed to be the same between ICU releases. We therefore recommend that you always compute confusable skeletons * at runtime and do not rely on creating a permanent, or difficult to update, database of skeletons. * * <h2>Spoof Detection</h2> * * The following snippet shows a minimal example of using <code>USpoofChecker</code> to perform spoof detection on a * string: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * UChar* str = (UChar*) u"p\u0430ypal"; // with U+0430 CYRILLIC SMALL LETTER A * * // Get the default set of allowable characters: * USet* allowed = uset_openEmpty(); * uset_addAll(allowed, uspoof_getRecommendedSet(&status)); * uset_addAll(allowed, uspoof_getInclusionSet(&status)); * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setAllowedChars(sc, allowed, &status); * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE); * * int32_t bitmask = uspoof_check(sc, str, -1, NULL, &status); * UBool result = bitmask != 0; * // fails checks: 1 (status: U_ZERO_ERROR) * printf("fails checks: %d (status: %s)\n", result, u_errorName(status)); * uspoof_close(sc); * uset_close(allowed); * \endcode * * As in the case for confusability checking, it is good practice to create one <code>USpoofChecker</code> instance at * startup, and call the cheaper {@link uspoof_check} online. We specify the set of * allowed characters to be those with type RECOMMENDED or INCLUSION, according to the recommendation in UTS 39. * * In addition to {@link uspoof_check}, the function {@link uspoof_checkUTF8} is exposed for UTF8-encoded char* strings, * and {@link uspoof_checkUnicodeString} is exposed for C++ programmers. * * If the {@link USPOOF_AUX_INFO} check is enabled, a limited amount of information on why a string failed the checks * is available in the returned bitmask. For complete information, use the {@link uspoof_check2} class of functions * with a {@link USpoofCheckResult} parameter: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * UChar* str = (UChar*) u"p\u0430ypal"; // with U+0430 CYRILLIC SMALL LETTER A * * // Get the default set of allowable characters: * USet* allowed = uset_openEmpty(); * uset_addAll(allowed, uspoof_getRecommendedSet(&status)); * uset_addAll(allowed, uspoof_getInclusionSet(&status)); * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setAllowedChars(sc, allowed, &status); * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE); * * USpoofCheckResult* checkResult = uspoof_openCheckResult(&status); * int32_t bitmask = uspoof_check2(sc, str, -1, checkResult, &status); * * int32_t failures1 = bitmask; * int32_t failures2 = uspoof_getCheckResultChecks(checkResult, &status); * assert(failures1 == failures2); * // checks that failed: 0x00000010 (status: U_ZERO_ERROR) * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status)); * * // Cleanup: * uspoof_close(sc); * uset_close(allowed); * uspoof_closeCheckResult(checkResult); * \endcode * * C++ users can take advantage of a few syntactical conveniences. The following snippet is functionally * equivalent to the one above: * * \code{.cpp} * UErrorCode status = U_ZERO_ERROR; * UnicodeString str((UChar*) u"p\u0430ypal"); // with U+0430 CYRILLIC SMALL LETTER A * * // Get the default set of allowable characters: * UnicodeSet allowed; * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status)); * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status)); * * LocalUSpoofCheckerPointer sc(uspoof_open(&status)); * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status); * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE); * * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status)); * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status); * * int32_t failures1 = bitmask; * int32_t failures2 = uspoof_getCheckResultChecks(checkResult.getAlias(), &status); * assert(failures1 == failures2); * // checks that failed: 0x00000010 (status: U_ZERO_ERROR) * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status)); * * // Explicit cleanup not necessary. * \endcode * * The return value is a bitmask of the checks that failed. In this case, there was one check that failed: * {@link USPOOF_RESTRICTION_LEVEL}, corresponding to the fifth bit (16). The possible checks are: * * <ul> * <li><code>RESTRICTION_LEVEL</code>: flags strings that violate the * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">Restriction Level</a> test as specified in UTS * 39; in most cases, this means flagging strings that contain characters from multiple different scripts.</li> * <li><code>INVISIBLE</code>: flags strings that contain invisible characters, such as zero-width spaces, or character * sequences that are likely not to display, such as multiple occurrences of the same non-spacing mark.</li> * <li><code>CHAR_LIMIT</code>: flags strings that contain characters outside of a specified set of acceptable * characters. See {@link uspoof_setAllowedChars} and {@link uspoof_setAllowedLocales}.</li> * <li><code>MIXED_NUMBERS</code>: flags strings that contain digits from multiple different numbering systems.</li> * </ul> * * <p> * These checks can be enabled independently of each other. For example, if you were interested in checking for only the * INVISIBLE and MIXED_NUMBERS conditions, you could do: * * \code{.c} * UErrorCode status = U_ZERO_ERROR; * UChar* str = (UChar*) u"8\u09EA"; // 8 mixed with U+09EA BENGALI DIGIT FOUR * * USpoofChecker* sc = uspoof_open(&status); * uspoof_setChecks(sc, USPOOF_INVISIBLE | USPOOF_MIXED_NUMBERS, &status); * * int32_t bitmask = uspoof_check2(sc, str, -1, NULL, &status); * UBool result = bitmask != 0; * // fails checks: 1 (status: U_ZERO_ERROR) * printf("fails checks: %d (status: %s)\n", result, u_errorName(status)); * uspoof_close(sc); * \endcode * * Here is an example in C++ showing how to compute the restriction level of a string: * * \code{.cpp} * UErrorCode status = U_ZERO_ERROR; * UnicodeString str((UChar*) u"p\u0430ypal"); // with U+0430 CYRILLIC SMALL LETTER A * * // Get the default set of allowable characters: * UnicodeSet allowed; * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status)); * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status)); * * LocalUSpoofCheckerPointer sc(uspoof_open(&status)); * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status); * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE); * uspoof_setChecks(sc.getAlias(), USPOOF_RESTRICTION_LEVEL | USPOOF_AUX_INFO, &status); * * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status)); * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status); * * URestrictionLevel restrictionLevel = uspoof_getCheckResultRestrictionLevel(checkResult.getAlias(), &status); * // Since USPOOF_AUX_INFO was enabled, the restriction level is also available in the upper bits of the bitmask: * assert((restrictionLevel & bitmask) == restrictionLevel); * // Restriction level: 0x50000000 (status: U_ZERO_ERROR) * printf("Restriction level: %#010x (status: %s)\n", restrictionLevel, u_errorName(status)); * \endcode * * The code '0x50000000' corresponds to the restriction level USPOOF_MINIMALLY_RESTRICTIVE. Since * USPOOF_MINIMALLY_RESTRICTIVE is weaker than USPOOF_MODERATELY_RESTRICTIVE, the string fails the check. * * <b>Note:</b> The Restriction Level is the most powerful of the checks. The full logic is documented in * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">UTS 39</a>, but the basic idea is that strings * are restricted to contain characters from only a single script, <em>except</em> that most scripts are allowed to have * Latin characters interspersed. Although the default restriction level is <code>HIGHLY_RESTRICTIVE</code>, it is * recommended that users set their restriction level to <code>MODERATELY_RESTRICTIVE</code>, which allows Latin mixed * with all other scripts except Cyrillic, Greek, and Cherokee, with which it is often confusable. For more details on * the levels, see UTS 39 or {@link URestrictionLevel}. The Restriction Level test is aware of the set of * allowed characters set in {@link uspoof_setAllowedChars}. Note that characters which have script code * COMMON or INHERITED, such as numbers and punctuation, are ignored when computing whether a string has multiple * scripts. * * <h2>Advanced bidirectional usage</h2> * If the paragraph direction with which the identifiers will be displayed is not known, there are * multiple options for confusable detection depending on the circumstances. * * <p> * In some circumstances, the only concern is confusion between identifiers displayed with the same * paragraph direction. * * <p> * An example is the case where identifiers are usernames prefixed with the @ symbol. * That symbol will appear to the left in a left-to-right context, and to the right in a * right-to-left context, so that an identifier displayed in a left-to-right context can never be * confused with an identifier displayed in a right-to-left context: * <ul> * <li> * The usernames "A1א" (A one aleph) and "Aא1" (A aleph 1) * would be considered confusable, since they both appear as \@A1א in a left-to-right context, and the * usernames "אA_1" (aleph A underscore one) and "א1_A" (aleph one underscore A) would be considered * confusable, since they both appear as A_1א@ in a right-to-left context. * </li> * <li> * The username "Mark_" would not be considered confusable with the username "_Mark", * even though the latter would appear as Mark_@ in a right-to-left context, and the * former as \@Mark_ in a left-to-right context. * </li> * </ul> * <p> * In that case, the caller should check for both LTR-confusability and RTL-confusability: * * \code{.cpp} * bool confusableInEitherDirection = * uspoof_areBidiConfusableUnicodeString(sc, UBIDI_LTR, id1, id2, &status) || * uspoof_areBidiConfusableUnicodeString(sc, UBIDI_RTL, id1, id2, &status); * \endcode * * If the bidiSkeleton is used, the LTR and RTL skeleta should be kept separately and compared, LTR * with LTR and RTL with RTL. * * <p> * In cases where confusability between the visual appearances of an identifier displayed in a * left-to-right context with another identifier displayed in a right-to-left context is a concern, * the LTR skeleton of one can be compared with the RTL skeleton of the other. However, this * very broad definition of confusability may have unexpected results; for instance, it treats the * ASCII identifiers "Mark_" and "_Mark" as confusable. * * <h2>Additional Information</h2> * * A <code>USpoofChecker</code> instance may be used repeatedly to perform checks on any number of identifiers. * * <b>Thread Safety:</b> The test functions for checking a single identifier, or for testing whether * two identifiers are possible confusable, are thread safe. They may called concurrently, from multiple threads, * using the same USpoofChecker instance. * * More generally, the standard ICU thread safety rules apply: functions that take a const USpoofChecker parameter are * thread safe. Those that take a non-const USpoofChecker are not thread safe.. * * @stable ICU 4.6 */ U_CDECL_BEGIN struct USpoofChecker; /** * @stable ICU 4.2 */ typedef struct USpoofChecker USpoofChecker; /**< typedef for C of USpoofChecker */ struct USpoofCheckResult; /** * @see uspoof_openCheckResult * @stable ICU 58 */ typedef struct USpoofCheckResult USpoofCheckResult; /** * Enum for the kinds of checks that USpoofChecker can perform. * These enum values are used both to select the set of checks that * will be performed, and to report results from the check function. * * @stable ICU 4.2 */ typedef enum USpoofChecks { /** * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates * that the two strings are visually confusable and that they are from the same script, according to UTS 39 section * 4. * * @see uspoof_areConfusable * @stable ICU 4.2 */ USPOOF_SINGLE_SCRIPT_CONFUSABLE = 1, /** * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates * that the two strings are visually confusable and that they are <b>not</b> from the same script, according to UTS * 39 section 4. * * @see uspoof_areConfusable * @stable ICU 4.2 */ USPOOF_MIXED_SCRIPT_CONFUSABLE = 2, /** * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates * that the two strings are visually confusable and that they are not from the same script but both of them are * single-script strings, according to UTS 39 section 4. * * @see uspoof_areConfusable * @stable ICU 4.2 */ USPOOF_WHOLE_SCRIPT_CONFUSABLE = 4, /** * Enable this flag in {@link uspoof_setChecks} to turn on all types of confusables. You may set * the checks to some subset of SINGLE_SCRIPT_CONFUSABLE, MIXED_SCRIPT_CONFUSABLE, or WHOLE_SCRIPT_CONFUSABLE to * make {@link uspoof_areConfusable} return only those types of confusables. * * @see uspoof_areConfusable * @see uspoof_getSkeleton * @stable ICU 58 */ USPOOF_CONFUSABLE = USPOOF_SINGLE_SCRIPT_CONFUSABLE | USPOOF_MIXED_SCRIPT_CONFUSABLE | USPOOF_WHOLE_SCRIPT_CONFUSABLE, #ifndef U_HIDE_DEPRECATED_API /** * This flag is deprecated and no longer affects the behavior of SpoofChecker. * * @deprecated ICU 58 Any case confusable mappings were removed from UTS 39; the corresponding ICU API was deprecated. */ USPOOF_ANY_CASE = 8, #endif /* U_HIDE_DEPRECATED_API */ /** * Check that an identifier is no looser than the specified RestrictionLevel. * The default if {@link uspoof_setRestrictionLevel} is not called is HIGHLY_RESTRICTIVE. * * If USPOOF_AUX_INFO is enabled the actual restriction level of the * identifier being tested will also be returned by uspoof_check(). * * @see URestrictionLevel * @see uspoof_setRestrictionLevel * @see USPOOF_AUX_INFO * * @stable ICU 51 */ USPOOF_RESTRICTION_LEVEL = 16, #ifndef U_HIDE_DEPRECATED_API /** Check that an identifier contains only characters from a * single script (plus chars from the common and inherited scripts.) * Applies to checks of a single identifier check only. * @deprecated ICU 51 Use RESTRICTION_LEVEL instead. */ USPOOF_SINGLE_SCRIPT = USPOOF_RESTRICTION_LEVEL, #endif /* U_HIDE_DEPRECATED_API */ /** Check an identifier for the presence of invisible characters, * such as zero-width spaces, or character sequences that are * likely not to display, such as multiple occurrences of the same * non-spacing mark. This check does not test the input string as a whole * for conformance to any particular syntax for identifiers. */ USPOOF_INVISIBLE = 32, /** Check that an identifier contains only characters from a specified set * of acceptable characters. See {@link uspoof_setAllowedChars} and * {@link uspoof_setAllowedLocales}. Note that a string that fails this check * will also fail the {@link USPOOF_RESTRICTION_LEVEL} check. */ USPOOF_CHAR_LIMIT = 64, /** * Check that an identifier does not mix numbers from different numbering systems. * For more information, see UTS 39 section 5.3. * * @stable ICU 51 */ USPOOF_MIXED_NUMBERS = 128, /** * Check that an identifier does not have a combining character following a character in which that * combining character would be hidden; for example 'i' followed by a U+0307 combining dot. * * More specifically, the following characters are forbidden from preceding a U+0307: * <ul> * <li>Those with the Soft_Dotted Unicode property (which includes 'i' and 'j')</li> * <li>Latin lowercase letter 'l'</li> * <li>Dotless 'i' and 'j' ('ı' and 'ȷ', U+0131 and U+0237)</li> * <li>Any character whose confusable prototype ends with such a character * (Soft_Dotted, 'l', 'ı', or 'ȷ')</li> * </ul> * In addition, combining characters are allowed between the above characters and U+0307 except those * with combining class 0 or combining class "Above" (230, same class as U+0307). * * This list and the number of combing characters considered by this check may grow over time. * * @stable ICU 62 */ USPOOF_HIDDEN_OVERLAY = 256, /** * Enable all spoof checks. * * @stable ICU 4.6 */ USPOOF_ALL_CHECKS = 0xFFFF, /** * Enable the return of auxiliary (non-error) information in the * upper bits of the check results value. * * If this "check" is not enabled, the results of {@link uspoof_check} will be * zero when an identifier passes all of the enabled checks. * * If this "check" is enabled, (uspoof_check() & {@link USPOOF_ALL_CHECKS}) will * be zero when an identifier passes all checks. * * @stable ICU 51 */ USPOOF_AUX_INFO = 0x40000000 } USpoofChecks; /** * Constants from UTS #39 for use in {@link uspoof_setRestrictionLevel}, and * for returned identifier restriction levels in check results. * * @stable ICU 51 * * @see uspoof_setRestrictionLevel * @see uspoof_check */ typedef enum URestrictionLevel { /** * All characters in the string are in the identifier profile and all characters in the string are in the * ASCII range. * * @stable ICU 51 */ USPOOF_ASCII = 0x10000000, /** * The string classifies as ASCII-Only, or all characters in the string are in the identifier profile and * the string is single-script, according to the definition in UTS 39 section 5.1. * * @stable ICU 53 */ USPOOF_SINGLE_SCRIPT_RESTRICTIVE = 0x20000000, /** * The string classifies as Single Script, or all characters in the string are in the identifier profile and * the string is covered by any of the following sets of scripts, according to the definition in UTS 39 * section 5.1: * <ul> * <li>Latin + Han + Bopomofo (or equivalently: Latn + Hanb)</li> * <li>Latin + Han + Hiragana + Katakana (or equivalently: Latn + Jpan)</li> * <li>Latin + Han + Hangul (or equivalently: Latn +Kore)</li> * </ul> * This is the default restriction in ICU. * * @stable ICU 51 */ USPOOF_HIGHLY_RESTRICTIVE = 0x30000000, /** * The string classifies as Highly Restrictive, or all characters in the string are in the identifier profile * and the string is covered by Latin and any one other Recommended or Aspirational script, except Cyrillic, * Greek, and Cherokee. * * @stable ICU 51 */ USPOOF_MODERATELY_RESTRICTIVE = 0x40000000, /** * All characters in the string are in the identifier profile. Allow arbitrary mixtures of scripts. * * @stable ICU 51 */ USPOOF_MINIMALLY_RESTRICTIVE = 0x50000000, /** * Any valid identifiers, including characters outside of the Identifier Profile. * * @stable ICU 51 */ USPOOF_UNRESTRICTIVE = 0x60000000, /** * Mask for selecting the Restriction Level bits from the return value of {@link uspoof_check}. * * @stable ICU 53 */ USPOOF_RESTRICTION_LEVEL_MASK = 0x7F000000, #ifndef U_HIDE_INTERNAL_API /** * An undefined restriction level. * @internal */ USPOOF_UNDEFINED_RESTRICTIVE = -1 #endif /* U_HIDE_INTERNAL_API */ } URestrictionLevel; /** * Create a Unicode Spoof Checker, configured to perform all * checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT. * Note that additional checks may be added in the future, * resulting in the changes to the default checking behavior. * * @param status The error code, set if this function encounters a problem. * @return the newly created Spoof Checker * @stable ICU 4.2 */ U_CAPI USpoofChecker * U_EXPORT2 uspoof_open(UErrorCode *status); /** * Open a Spoof checker from its serialized form, stored in 32-bit-aligned memory. * Inverse of uspoof_serialize(). * The memory containing the serialized data must remain valid and unchanged * as long as the spoof checker, or any cloned copies of the spoof checker, * are in use. Ownership of the memory remains with the caller. * The spoof checker (and any clones) must be closed prior to deleting the * serialized data. * * @param data a pointer to 32-bit-aligned memory containing the serialized form of spoof data * @param length the number of bytes available at data; * can be more than necessary * @param pActualLength receives the actual number of bytes at data taken up by the data; * can be NULL * @param pErrorCode ICU error code * @return the spoof checker. * * @see uspoof_open * @see uspoof_serialize * @stable ICU 4.2 */ U_CAPI USpoofChecker * U_EXPORT2 uspoof_openFromSerialized(const void *data, int32_t length, int32_t *pActualLength, UErrorCode *pErrorCode); /** * Open a Spoof Checker from the source form of the spoof data. * The input corresponds to the Unicode data file confusables.txt * as described in Unicode Technical Standard #39. The syntax of the source data * is as described in UTS #39 for this file, and the content of * this file is acceptable input. * * The character encoding of the (char *) input text is UTF-8. * * @param confusables a pointer to the confusable characters definitions, * as found in file confusables.txt from unicode.org. * @param confusablesLen The length of the confusables text, or -1 if the * input string is zero terminated. * @param confusablesWholeScript * Deprecated in ICU 58. No longer used. * @param confusablesWholeScriptLen * Deprecated in ICU 58. No longer used. * @param errType In the event of an error in the input, indicates * which of the input files contains the error. * The value is one of USPOOF_SINGLE_SCRIPT_CONFUSABLE or * USPOOF_WHOLE_SCRIPT_CONFUSABLE, or * zero if no errors are found. * @param pe In the event of an error in the input, receives the position * in the input text (line, offset) of the error. * @param status an in/out ICU UErrorCode. Among the possible errors is * U_PARSE_ERROR, which is used to report syntax errors * in the input. * @return A spoof checker that uses the rules from the input files. * @stable ICU 4.2 */ U_CAPI USpoofChecker * U_EXPORT2 uspoof_openFromSource(const char *confusables, int32_t confusablesLen, const char *confusablesWholeScript, int32_t confusablesWholeScriptLen, int32_t *errType, UParseError *pe, UErrorCode *status); /** * Close a Spoof Checker, freeing any memory that was being held by * its implementation. * @stable ICU 4.2 */ U_CAPI void U_EXPORT2 uspoof_close(USpoofChecker *sc); /** * Clone a Spoof Checker. The clone will be set to perform the same checks * as the original source. * * @param sc The source USpoofChecker * @param status The error code, set if this function encounters a problem. * @return * @stable ICU 4.2 */ U_CAPI USpoofChecker * U_EXPORT2 uspoof_clone(const USpoofChecker *sc, UErrorCode *status); /** * Specify the bitmask of checks that will be performed by {@link uspoof_check}. Calling this method * overwrites any checks that may have already been enabled. By default, all checks are enabled. * * To enable specific checks and disable all others, * OR together only the bit constants for the desired checks. * For example, to fail strings containing characters outside of * the set specified by {@link uspoof_setAllowedChars} and * also strings that contain digits from mixed numbering systems: * * <pre> * {@code * uspoof_setChecks(USPOOF_CHAR_LIMIT | USPOOF_MIXED_NUMBERS); * } * </pre> * * To disable specific checks and enable all others, * start with ALL_CHECKS and "AND away" the not-desired checks. * For example, if you are not planning to use the {@link uspoof_areConfusable} functionality, * it is good practice to disable the CONFUSABLE check: * * <pre> * {@code * uspoof_setChecks(USPOOF_ALL_CHECKS & ~USPOOF_CONFUSABLE); * } * </pre> * * Note that methods such as {@link uspoof_setAllowedChars}, {@link uspoof_setAllowedLocales}, and * {@link uspoof_setRestrictionLevel} will enable certain checks when called. Those methods will OR the check they * enable onto the existing bitmask specified by this method. For more details, see the documentation of those * methods. * * @param sc The USpoofChecker * @param checks The set of checks that this spoof checker will perform. * The value is a bit set, obtained by OR-ing together * values from enum USpoofChecks. * @param status The error code, set if this function encounters a problem. * @stable ICU 4.2 * */ U_CAPI void U_EXPORT2 uspoof_setChecks(USpoofChecker *sc, int32_t checks, UErrorCode *status); /** * Get the set of checks that this Spoof Checker has been configured to perform. * * @param sc The USpoofChecker * @param status The error code, set if this function encounters a problem. * @return The set of checks that this spoof checker will perform. * The value is a bit set, obtained by OR-ing together * values from enum USpoofChecks. * @stable ICU 4.2 * */ U_CAPI int32_t U_EXPORT2 uspoof_getChecks(const USpoofChecker *sc, UErrorCode *status); /** * Set the loosest restriction level allowed for strings. The default if this is not called is * {@link USPOOF_HIGHLY_RESTRICTIVE}. Calling this method enables the {@link USPOOF_RESTRICTION_LEVEL} and * {@link USPOOF_MIXED_NUMBERS} checks, corresponding to Sections 5.1 and 5.2 of UTS 39. To customize which checks are * to be performed by {@link uspoof_check}, see {@link uspoof_setChecks}. * * @param sc The USpoofChecker * @param restrictionLevel The loosest restriction level allowed. * @see URestrictionLevel * @stable ICU 51 */ U_CAPI void U_EXPORT2 uspoof_setRestrictionLevel(USpoofChecker *sc, URestrictionLevel restrictionLevel); /** * Get the Restriction Level that will be tested if the checks include {@link USPOOF_RESTRICTION_LEVEL}. * * @return The restriction level * @see URestrictionLevel * @stable ICU 51 */ U_CAPI URestrictionLevel U_EXPORT2 uspoof_getRestrictionLevel(const USpoofChecker *sc); /** * Limit characters that are acceptable in identifiers being checked to those * normally used with the languages associated with the specified locales. * Any previously specified list of locales is replaced by the new settings. * * A set of languages is determined from the locale(s), and * from those a set of acceptable Unicode scripts is determined. * Characters from this set of scripts, along with characters from * the "common" and "inherited" Unicode Script categories * will be permitted. * * Supplying an empty string removes all restrictions; * characters from any script will be allowed. * * The {@link USPOOF_CHAR_LIMIT} test is automatically enabled for this * USpoofChecker when calling this function with a non-empty list * of locales. * * The Unicode Set of characters that will be allowed is accessible * via the uspoof_getAllowedChars() function. uspoof_setAllowedLocales() * will <i>replace</i> any previously applied set of allowed characters. * * Adjustments, such as additions or deletions of certain classes of characters, * can be made to the result of uspoof_setAllowedLocales() by * fetching the resulting set with uspoof_getAllowedChars(), * manipulating it with the Unicode Set API, then resetting the * spoof detectors limits with uspoof_setAllowedChars(). * * @param sc The USpoofChecker * @param localesList A list list of locales, from which the language * and associated script are extracted. The locales * are comma-separated if there is more than one. * White space may not appear within an individual locale, * but is ignored otherwise. * The locales are syntactically like those from the * HTTP Accept-Language header. * If the localesList is empty, no restrictions will be placed on * the allowed characters. * * @param status The error code, set if this function encounters a problem. * @stable ICU 4.2 */ U_CAPI void U_EXPORT2 uspoof_setAllowedLocales(USpoofChecker *sc, const char *localesList, UErrorCode *status); /** * Get a list of locales for the scripts that are acceptable in strings * to be checked. If no limitations on scripts have been specified, * an empty string will be returned. * * uspoof_setAllowedChars() will reset the list of allowed to be empty. * * The format of the returned list is the same as that supplied to * uspoof_setAllowedLocales(), but returned list may not be identical * to the originally specified string; the string may be reformatted, * and information other than languages from * the originally specified locales may be omitted. * * @param sc The USpoofChecker * @param status The error code, set if this function encounters a problem. * @return A string containing a list of locales corresponding * to the acceptable scripts, formatted like an * HTTP Accept Language value. * * @stable ICU 4.2 */ U_CAPI const char * U_EXPORT2 uspoof_getAllowedLocales(USpoofChecker *sc, UErrorCode *status); /** * Limit the acceptable characters to those specified by a Unicode Set. * Any previously specified character limit is * is replaced by the new settings. This includes limits on * characters that were set with the uspoof_setAllowedLocales() function. * * The USPOOF_CHAR_LIMIT test is automatically enabled for this * USpoofChecker by this function. * * @param sc The USpoofChecker * @param chars A Unicode Set containing the list of * characters that are permitted. Ownership of the set * remains with the caller. The incoming set is cloned by * this function, so there are no restrictions on modifying * or deleting the USet after calling this function. * @param status The error code, set if this function encounters a problem. * @stable ICU 4.2 */ U_CAPI void U_EXPORT2 uspoof_setAllowedChars(USpoofChecker *sc, const USet *chars, UErrorCode *status); /** * Get a USet for the characters permitted in an identifier. * This corresponds to the limits imposed by the Set Allowed Characters * functions. Limitations imposed by other checks will not be * reflected in the set returned by this function. * * The returned set will be frozen, meaning that it cannot be modified * by the caller. * * Ownership of the returned set remains with the Spoof Detector. The * returned set will become invalid if the spoof detector is closed, * or if a new set of allowed characters is specified. * * * @param sc The USpoofChecker * @param status The error code, set if this function encounters a problem. * @return A USet containing the characters that are permitted by * the USPOOF_CHAR_LIMIT test. * @stable ICU 4.2 */ U_CAPI const USet * U_EXPORT2 uspoof_getAllowedChars(const USpoofChecker *sc, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * \note * Consider using the newer API, {@link uspoof_check2}, instead. * The newer API exposes additional information from the check procedure * and is otherwise identical to this method. * * @param sc The USpoofChecker * @param id The identifier to be checked for possible security issues, * in UTF-16 format. * @param length the length of the string to be checked, expressed in * 16 bit UTF-16 code units, or -1 if the string is * zero terminated. * @param position Deprecated in ICU 51. Always returns zero. * Originally, an out parameter for the index of the first * string position that failed a check. * This parameter may be NULL. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. * @see uspoof_check2 * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_check(const USpoofChecker *sc, const UChar *id, int32_t length, int32_t *position, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * \note * Consider using the newer API, {@link uspoof_check2UTF8}, instead. * The newer API exposes additional information from the check procedure * and is otherwise identical to this method. * * @param sc The USpoofChecker * @param id A identifier to be checked for possible security issues, in UTF8 format. * @param length the length of the string to be checked, or -1 if the string is * zero terminated. * @param position Deprecated in ICU 51. Always returns zero. * Originally, an out parameter for the index of the first * string position that failed a check. * This parameter may be NULL. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * If the input contains invalid UTF-8 sequences, * a status of U_INVALID_CHAR_FOUND will be returned. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. * @see uspoof_check2UTF8 * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_checkUTF8(const USpoofChecker *sc, const char *id, int32_t length, int32_t *position, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * @param sc The USpoofChecker * @param id The identifier to be checked for possible security issues, * in UTF-16 format. * @param length the length of the string to be checked, or -1 if the string is * zero terminated. * @param checkResult An instance of USpoofCheckResult to be filled with * details about the identifier. Can be NULL. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. Any information in this bitmask will be * consistent with the information saved in the optional * checkResult parameter. * @see uspoof_openCheckResult * @see uspoof_check2UTF8 * @see uspoof_check2UnicodeString * @stable ICU 58 */ U_CAPI int32_t U_EXPORT2 uspoof_check2(const USpoofChecker *sc, const UChar* id, int32_t length, USpoofCheckResult* checkResult, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * This version of {@link uspoof_check} accepts a USpoofCheckResult, which * returns additional information about the identifier. For more * information, see {@link uspoof_openCheckResult}. * * @param sc The USpoofChecker * @param id A identifier to be checked for possible security issues, in UTF8 format. * @param length the length of the string to be checked, or -1 if the string is * zero terminated. * @param checkResult An instance of USpoofCheckResult to be filled with * details about the identifier. Can be NULL. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. Any information in this bitmask will be * consistent with the information saved in the optional * checkResult parameter. * @see uspoof_openCheckResult * @see uspoof_check2 * @see uspoof_check2UnicodeString * @stable ICU 58 */ U_CAPI int32_t U_EXPORT2 uspoof_check2UTF8(const USpoofChecker *sc, const char *id, int32_t length, USpoofCheckResult* checkResult, UErrorCode *status); /** * Create a USpoofCheckResult, used by the {@link uspoof_check2} class of functions to return * information about the identifier. Information includes: * <ul> * <li>A bitmask of the checks that failed</li> * <li>The identifier's restriction level (UTS 39 section 5.2)</li> * <li>The set of numerics in the string (UTS 39 section 5.3)</li> * </ul> * The data held in a USpoofCheckResult is cleared whenever it is passed into a new call * of {@link uspoof_check2}. * * @param status The error code, set if this function encounters a problem. * @return the newly created USpoofCheckResult * @see uspoof_check2 * @see uspoof_check2UTF8 * @see uspoof_check2UnicodeString * @stable ICU 58 */ U_CAPI USpoofCheckResult* U_EXPORT2 uspoof_openCheckResult(UErrorCode *status); /** * Close a USpoofCheckResult, freeing any memory that was being held by * its implementation. * * @param checkResult The instance of USpoofCheckResult to close * @stable ICU 58 */ U_CAPI void U_EXPORT2 uspoof_closeCheckResult(USpoofCheckResult *checkResult); /** * Indicates which of the spoof check(s) have failed. The value is a bitwise OR of the constants for the tests * in question: USPOOF_RESTRICTION_LEVEL, USPOOF_CHAR_LIMIT, and so on. * * @param checkResult The instance of USpoofCheckResult created by {@link uspoof_openCheckResult} * @param status The error code, set if an error occurred. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. * @see uspoof_setChecks * @stable ICU 58 */ U_CAPI int32_t U_EXPORT2 uspoof_getCheckResultChecks(const USpoofCheckResult *checkResult, UErrorCode *status); /** * Gets the restriction level that the text meets, if the USPOOF_RESTRICTION_LEVEL check * was enabled; otherwise, undefined. * * @param checkResult The instance of USpoofCheckResult created by {@link uspoof_openCheckResult} * @param status The error code, set if an error occurred. * @return The restriction level contained in the USpoofCheckResult * @see uspoof_setRestrictionLevel * @stable ICU 58 */ U_CAPI URestrictionLevel U_EXPORT2 uspoof_getCheckResultRestrictionLevel(const USpoofCheckResult *checkResult, UErrorCode *status); /** * Gets the set of numerics found in the string, if the USPOOF_MIXED_NUMBERS check was enabled; * otherwise, undefined. The set will contain the zero digit from each decimal number system found * in the input string. Ownership of the returned USet remains with the USpoofCheckResult. * The USet will be free'd when {@link uspoof_closeCheckResult} is called. * * @param checkResult The instance of USpoofCheckResult created by {@link uspoof_openCheckResult} * @return The set of numerics contained in the USpoofCheckResult * @param status The error code, set if an error occurred. * @stable ICU 58 */ U_CAPI const USet* U_EXPORT2 uspoof_getCheckResultNumerics(const USpoofCheckResult *checkResult, UErrorCode *status); /** * Check whether two specified strings are visually confusable. * * If the strings are confusable, the return value will be nonzero, as long as * {@link USPOOF_CONFUSABLE} was enabled in uspoof_setChecks(). * * The bits in the return value correspond to flags for each of the classes of * confusables applicable to the two input strings. According to UTS 39 * section 4, the possible flags are: * * <ul> * <li>{@link USPOOF_SINGLE_SCRIPT_CONFUSABLE}</li> * <li>{@link USPOOF_MIXED_SCRIPT_CONFUSABLE}</li> * <li>{@link USPOOF_WHOLE_SCRIPT_CONFUSABLE}</li> * </ul> * * If one or more of the above flags were not listed in uspoof_setChecks(), this * function will never report that class of confusable. The check * {@link USPOOF_CONFUSABLE} enables all three flags. * * * @param sc The USpoofChecker * @param id1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-16 format. * @param length1 the length of the first identifier, expressed in * 16 bit UTF-16 code units, or -1 if the string is * nul terminated. * @param id2 The second of the two identifiers to be compared for * confusability. The identifiers are in UTF-16 format. * @param length2 The length of the second identifiers, expressed in * 16 bit UTF-16 code units, or -1 if the string is * nul terminated. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the identifiers is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the identifiers * are not confusable. * * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_areConfusable(const USpoofChecker *sc, const UChar *id1, int32_t length1, const UChar *id2, int32_t length2, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * Check whether two specified strings are visually confusable when * displayed in a context with the given paragraph direction. * * If the strings are confusable, the return value will be nonzero, as long as * {@link USPOOF_CONFUSABLE} was enabled in uspoof_setChecks(). * * The bits in the return value correspond to flags for each of the classes of * confusables applicable to the two input strings. According to UTS 39 * section 4, the possible flags are: * * <ul> * <li>{@link USPOOF_SINGLE_SCRIPT_CONFUSABLE}</li> * <li>{@link USPOOF_MIXED_SCRIPT_CONFUSABLE}</li> * <li>{@link USPOOF_WHOLE_SCRIPT_CONFUSABLE}</li> * </ul> * * If one or more of the above flags were not listed in uspoof_setChecks(), this * function will never report that class of confusable. The check * {@link USPOOF_CONFUSABLE} enables all three flags. * * * @param sc The USpoofChecker * @param direction The paragraph direction with which the identifiers are * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param id1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-16 format. * @param length1 the length of the first identifier, expressed in * 16 bit UTF-16 code units, or -1 if the string is * nul terminated. * @param id2 The second of the two identifiers to be compared for * confusability. The identifiers are in UTF-16 format. * @param length2 The length of the second identifiers, expressed in * 16 bit UTF-16 code units, or -1 if the string is * nul terminated. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the identifiers is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the identifiers * are not confusable. * * @draft ICU 74 */ U_CAPI uint32_t U_EXPORT2 uspoof_areBidiConfusable(const USpoofChecker *sc, UBiDiDirection direction, const UChar *id1, int32_t length1, const UChar *id2, int32_t length2, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * A version of {@link uspoof_areConfusable} accepting strings in UTF-8 format. * * @param sc The USpoofChecker * @param id1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param length1 the length of the first identifiers, in bytes, or -1 * if the string is nul terminated. * @param id2 The second of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param length2 The length of the second string in bytes, or -1 * if the string is nul terminated. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the strings is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the strings * are not confusable. * * @stable ICU 4.2 * * @see uspoof_areConfusable */ U_CAPI int32_t U_EXPORT2 uspoof_areConfusableUTF8(const USpoofChecker *sc, const char *id1, int32_t length1, const char *id2, int32_t length2, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * A version of {@link uspoof_areBidiConfusable} accepting strings in UTF-8 format. * * @param sc The USpoofChecker * @param direction The paragraph direction with which the identifiers are * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param id1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param length1 the length of the first identifiers, in bytes, or -1 * if the string is nul terminated. * @param id2 The second of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param length2 The length of the second string in bytes, or -1 * if the string is nul terminated. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the strings is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the strings * are not confusable. * * @draft ICU 74 * * @see uspoof_areBidiConfusable */ U_CAPI uint32_t U_EXPORT2 uspoof_areBidiConfusableUTF8(const USpoofChecker *sc, UBiDiDirection direction, const char *id1, int32_t length1, const char *id2, int32_t length2, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * Get the "skeleton" for an identifier. * Skeletons are a transformation of the input identifier; * Two identifiers are confusable if their skeletons are identical. * See Unicode Technical Standard #39 for additional information. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker * @param type Deprecated in ICU 58. You may pass any number. * Originally, controlled which of the Unicode confusable data * tables to use. * @param id The input identifier whose skeleton will be computed. * @param length The length of the input identifier, expressed in 16 bit * UTF-16 code units, or -1 if the string is zero terminated. * @param dest The output buffer, to receive the skeleton string. * @param destCapacity The length of the output buffer, in 16 bit units. * The destCapacity may be zero, in which case the function will * return the actual length of the skeleton. * @param status The error code, set if an error occurred while attempting to * perform the check. * @return The length of the skeleton string. The returned length * is always that of the complete skeleton, even when the * supplied buffer is too small (or of zero length) * * @stable ICU 4.2 * @see uspoof_areConfusable */ U_CAPI int32_t U_EXPORT2 uspoof_getSkeleton(const USpoofChecker *sc, uint32_t type, const UChar *id, int32_t length, UChar *dest, int32_t destCapacity, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * Get the "bidiSkeleton" for an identifier and a direction. * Skeletons are a transformation of the input identifier; * Two identifiers are LTR-confusable if their LTR bidiSkeletons are identical; * they are RTL-confusable if their RTL bidiSkeletons are identical. * See Unicode Technical Standard #39 for additional information: * https://www.unicode.org/reports/tr39/#Confusable_Detection. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker. * @param direction The context direction with which the identifier will be * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param id The input identifier whose skeleton will be computed. * @param length The length of the input identifier, expressed in 16 bit * UTF-16 code units, or -1 if the string is zero terminated. * @param dest The output buffer, to receive the skeleton string. * @param destCapacity The length of the output buffer, in 16 bit units. * The destCapacity may be zero, in which case the function will * return the actual length of the skeleton. * @param status The error code, set if an error occurred while attempting to * perform the check. * @return The length of the skeleton string. The returned length * is always that of the complete skeleton, even when the * supplied buffer is too small (or of zero length) * * @draft ICU 74 * @see uspoof_areBidiConfusable */ U_CAPI int32_t U_EXPORT2 uspoof_getBidiSkeleton(const USpoofChecker *sc, UBiDiDirection direction, const UChar *id, int32_t length, UChar *dest, int32_t destCapacity, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * Get the "skeleton" for an identifier. * Skeletons are a transformation of the input identifier; * Two identifiers are confusable if their skeletons are identical. * See Unicode Technical Standard #39 for additional information. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker * @param type Deprecated in ICU 58. You may pass any number. * Originally, controlled which of the Unicode confusable data * tables to use. * @param id The UTF-8 format identifier whose skeleton will be computed. * @param length The length of the input string, in bytes, * or -1 if the string is zero terminated. * @param dest The output buffer, to receive the skeleton string. * @param destCapacity The length of the output buffer, in bytes. * The destCapacity may be zero, in which case the function will * return the actual length of the skeleton. * @param status The error code, set if an error occurred while attempting to * perform the check. Possible Errors include U_INVALID_CHAR_FOUND * for invalid UTF-8 sequences, and * U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small * to hold the complete skeleton. * @return The length of the skeleton string, in bytes. The returned length * is always that of the complete skeleton, even when the * supplied buffer is too small (or of zero length) * * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_getSkeletonUTF8(const USpoofChecker *sc, uint32_t type, const char *id, int32_t length, char *dest, int32_t destCapacity, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * Get the "bidiSkeleton" for an identifier and a direction. * Skeletons are a transformation of the input identifier; * Two identifiers are LTR-confusable if their LTR bidiSkeletons are identical; * they are RTL-confusable if their RTL bidiSkeletons are identical. * See Unicode Technical Standard #39 for additional information: * https://www.unicode.org/reports/tr39/#Confusable_Detection. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker * @param direction The context direction with which the identifier will be * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param id The UTF-8 format identifier whose skeleton will be computed. * @param length The length of the input string, in bytes, * or -1 if the string is zero terminated. * @param dest The output buffer, to receive the skeleton string. * @param destCapacity The length of the output buffer, in bytes. * The destCapacity may be zero, in which case the function will * return the actual length of the skeleton. * @param status The error code, set if an error occurred while attempting to * perform the check. Possible Errors include U_INVALID_CHAR_FOUND * for invalid UTF-8 sequences, and * U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small * to hold the complete skeleton. * @return The length of the skeleton string, in bytes. The returned length * is always that of the complete skeleton, even when the * supplied buffer is too small (or of zero length) * * @draft ICU 74 */ U_CAPI int32_t U_EXPORT2 uspoof_getBidiSkeletonUTF8(const USpoofChecker *sc, UBiDiDirection direction, const char *id, int32_t length, char *dest, int32_t destCapacity, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * Get the set of Candidate Characters for Inclusion in Identifiers, as defined * in http://unicode.org/Public/security/latest/xidmodifications.txt * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms. * * The returned set is frozen. Ownership of the set remains with the ICU library; it must not * be deleted by the caller. * * @param status The error code, set if a problem occurs while creating the set. * * @stable ICU 51 */ U_CAPI const USet * U_EXPORT2 uspoof_getInclusionSet(UErrorCode *status); /** * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined * in http://unicode.org/Public/security/latest/xidmodifications.txt * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms. * * The returned set is frozen. Ownership of the set remains with the ICU library; it must not * be deleted by the caller. * * @param status The error code, set if a problem occurs while creating the set. * * @stable ICU 51 */ U_CAPI const USet * U_EXPORT2 uspoof_getRecommendedSet(UErrorCode *status); /** * Serialize the data for a spoof detector into a chunk of memory. * The flattened spoof detection tables can later be used to efficiently * instantiate a new Spoof Detector. * * The serialized spoof checker includes only the data compiled from the * Unicode data tables by uspoof_openFromSource(); it does not include * include any other state or configuration that may have been set. * * @param sc the Spoof Detector whose data is to be serialized. * @param data a pointer to 32-bit-aligned memory to be filled with the data, * can be NULL if capacity==0 * @param capacity the number of bytes available at data, * or 0 for preflighting * @param status an in/out ICU UErrorCode; possible errors include: * - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization * - U_ILLEGAL_ARGUMENT_ERROR the data or capacity parameters are bad * @return the number of bytes written or needed for the spoof data * * @see utrie2_openFromSerialized() * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_serialize(USpoofChecker *sc, void *data, int32_t capacity, UErrorCode *status); U_CDECL_END #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUSpoofCheckerPointer * "Smart pointer" class, closes a USpoofChecker via uspoof_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 4.4 */ /** * \cond * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER. * For now, suppress with a Doxygen cond */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckerPointer, USpoofChecker, uspoof_close); /** \endcond */ /** * \class LocalUSpoofCheckResultPointer * "Smart pointer" class, closes a USpoofCheckResult via `uspoof_closeCheckResult()`. * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 58 */ /** * \cond * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER. * For now, suppress with a Doxygen cond */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckResultPointer, USpoofCheckResult, uspoof_closeCheckResult); /** \endcond */ U_NAMESPACE_END /** * Limit the acceptable characters to those specified by a Unicode Set. * Any previously specified character limit is * is replaced by the new settings. This includes limits on * characters that were set with the uspoof_setAllowedLocales() function. * * The USPOOF_CHAR_LIMIT test is automatically enabled for this * USoofChecker by this function. * * @param sc The USpoofChecker * @param chars A Unicode Set containing the list of * characters that are permitted. Ownership of the set * remains with the caller. The incoming set is cloned by * this function, so there are no restrictions on modifying * or deleting the UnicodeSet after calling this function. * @param status The error code, set if this function encounters a problem. * @stable ICU 4.2 */ U_CAPI void U_EXPORT2 uspoof_setAllowedUnicodeSet(USpoofChecker *sc, const icu::UnicodeSet *chars, UErrorCode *status); /** * Get a UnicodeSet for the characters permitted in an identifier. * This corresponds to the limits imposed by the Set Allowed Characters / * UnicodeSet functions. Limitations imposed by other checks will not be * reflected in the set returned by this function. * * The returned set will be frozen, meaning that it cannot be modified * by the caller. * * Ownership of the returned set remains with the Spoof Detector. The * returned set will become invalid if the spoof detector is closed, * or if a new set of allowed characters is specified. * * * @param sc The USpoofChecker * @param status The error code, set if this function encounters a problem. * @return A UnicodeSet containing the characters that are permitted by * the USPOOF_CHAR_LIMIT test. * @stable ICU 4.2 */ U_CAPI const icu::UnicodeSet * U_EXPORT2 uspoof_getAllowedUnicodeSet(const USpoofChecker *sc, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * \note * Consider using the newer API, {@link uspoof_check2UnicodeString}, instead. * The newer API exposes additional information from the check procedure * and is otherwise identical to this method. * * @param sc The USpoofChecker * @param id A identifier to be checked for possible security issues. * @param position Deprecated in ICU 51. Always returns zero. * Originally, an out parameter for the index of the first * string position that failed a check. * This parameter may be nullptr. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. * @see uspoof_check2UnicodeString * @stable ICU 4.2 */ U_CAPI int32_t U_EXPORT2 uspoof_checkUnicodeString(const USpoofChecker *sc, const icu::UnicodeString &id, int32_t *position, UErrorCode *status); /** * Check the specified string for possible security issues. * The text to be checked will typically be an identifier of some sort. * The set of checks to be performed is specified with uspoof_setChecks(). * * @param sc The USpoofChecker * @param id A identifier to be checked for possible security issues. * @param checkResult An instance of USpoofCheckResult to be filled with * details about the identifier. Can be nullptr. * @param status The error code, set if an error occurred while attempting to * perform the check. * Spoofing or security issues detected with the input string are * not reported here, but through the function's return value. * @return An integer value with bits set for any potential security * or spoofing issues detected. The bits are defined by * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) * will be zero if the input string passes all of the * enabled checks. Any information in this bitmask will be * consistent with the information saved in the optional * checkResult parameter. * @see uspoof_openCheckResult * @see uspoof_check2 * @see uspoof_check2UTF8 * @stable ICU 58 */ U_CAPI int32_t U_EXPORT2 uspoof_check2UnicodeString(const USpoofChecker *sc, const icu::UnicodeString &id, USpoofCheckResult* checkResult, UErrorCode *status); /** * A version of {@link uspoof_areConfusable} accepting UnicodeStrings. * * @param sc The USpoofChecker * @param s1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param s2 The second of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the identifiers is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the identifiers * are not confusable. * * @stable ICU 4.2 * * @see uspoof_areConfusable */ U_CAPI int32_t U_EXPORT2 uspoof_areConfusableUnicodeString(const USpoofChecker *sc, const icu::UnicodeString &s1, const icu::UnicodeString &s2, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * A version of {@link uspoof_areBidiConfusable} accepting UnicodeStrings. * * @param sc The USpoofChecker * @param direction The paragraph direction with which the identifiers are * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param s1 The first of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param s2 The second of the two identifiers to be compared for * confusability. The strings are in UTF-8 format. * @param status The error code, set if an error occurred while attempting to * perform the check. * Confusability of the identifiers is not reported here, * but through this function's return value. * @return An integer value with bit(s) set corresponding to * the type of confusability found, as defined by * enum USpoofChecks. Zero is returned if the identifiers * are not confusable. * * @draft ICU 74 * * @see uspoof_areBidiConfusable */ U_CAPI uint32_t U_EXPORT2 uspoof_areBidiConfusableUnicodeString(const USpoofChecker *sc, UBiDiDirection direction, const icu::UnicodeString &s1, const icu::UnicodeString &s2, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * Get the "skeleton" for an identifier. * Skeletons are a transformation of the input identifier; * Two identifiers are confusable if their skeletons are identical. * See Unicode Technical Standard #39 for additional information. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker. * @param type Deprecated in ICU 58. You may pass any number. * Originally, controlled which of the Unicode confusable data * tables to use. * @param id The input identifier whose skeleton will be computed. * @param dest The output identifier, to receive the skeleton string. * @param status The error code, set if an error occurred while attempting to * perform the check. * @return A reference to the destination (skeleton) string. * * @stable ICU 4.2 */ U_I18N_API icu::UnicodeString & U_EXPORT2 uspoof_getSkeletonUnicodeString(const USpoofChecker *sc, uint32_t type, const icu::UnicodeString &id, icu::UnicodeString &dest, UErrorCode *status); #ifndef U_HIDE_DRAFT_API /** * Get the "bidiSkeleton" for an identifier and a direction. * Skeletons are a transformation of the input identifier; * Two identifiers are LTR-confusable if their LTR bidiSkeletons are identical; * they are RTL-confusable if their RTL bidiSkeletons are identical. * See Unicode Technical Standard #39 for additional information. * https://www.unicode.org/reports/tr39/#Confusable_Detection. * * Using skeletons directly makes it possible to quickly check * whether an identifier is confusable with any of some large * set of existing identifiers, by creating an efficiently * searchable collection of the skeletons. * * @param sc The USpoofChecker. * @param direction The context direction with which the identifier will be * displayed. Must be either UBIDI_LTR or UBIDI_RTL. * @param id The input identifier whose bidiSkeleton will be computed. * @param dest The output identifier, to receive the skeleton string. * @param status The error code, set if an error occurred while attempting to * perform the check. * @return A reference to the destination (skeleton) string. * * @draft ICU 74 */ U_I18N_API icu::UnicodeString &U_EXPORT2 uspoof_getBidiSkeletonUnicodeString( const USpoofChecker *sc, UBiDiDirection direction, const icu::UnicodeString &id, icu::UnicodeString &dest, UErrorCode *status); #endif /* U_HIDE_DRAFT_API */ /** * Get the set of Candidate Characters for Inclusion in Identifiers, as defined * in http://unicode.org/Public/security/latest/xidmodifications.txt * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms. * * The returned set is frozen. Ownership of the set remains with the ICU library; it must not * be deleted by the caller. * * @param status The error code, set if a problem occurs while creating the set. * * @stable ICU 51 */ U_CAPI const icu::UnicodeSet * U_EXPORT2 uspoof_getInclusionUnicodeSet(UErrorCode *status); /** * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined * in http://unicode.org/Public/security/latest/xidmodifications.txt * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms. * * The returned set is frozen. Ownership of the set remains with the ICU library; it must not * be deleted by the caller. * * @param status The error code, set if a problem occurs while creating the set. * * @stable ICU 51 */ U_CAPI const icu::UnicodeSet * U_EXPORT2 uspoof_getRecommendedUnicodeSet(UErrorCode *status); #endif /* U_SHOW_CPLUSPLUS_API */ #endif /* UCONFIG_NO_NORMALIZATION */ #endif /* USPOOF_H */
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