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diff --git a/intl/icu/source/i18n/unicode/uspoof.h b/intl/icu/source/i18n/unicode/uspoof.h new file mode 100644 index 0000000000..442655bb54 --- /dev/null +++ b/intl/icu/source/i18n/unicode/uspoof.h @@ -0,0 +1,1577 @@ +// © 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/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. + * + * <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>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 UAX #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 UAX #39. The syntax of the source data + * is as described in UAX #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 the 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); + + + +/** + * 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); + + + + +/** + * 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 UAX #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); + +/** + * 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 UAX #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); + +/** + * 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); + +/** + * 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 UAX #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); + +/** + * 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 */ |