1 /* 2 *************************************************************************** 3 * Copyright (C) 2008-2015, International Business Machines Corporation 4 * and others. All Rights Reserved. 5 *************************************************************************** 6 * file name: uspoof.h 7 * encoding: US-ASCII 8 * tab size: 8 (not used) 9 * indentation:4 10 * 11 * created on: 2008Feb13 12 * created by: Andy Heninger 13 * 14 * Unicode Spoof Detection 15 */ 16 17 #ifndef USPOOF_H 18 #define USPOOF_H 19 20 #include "unicode/utypes.h" 21 #include "unicode/uset.h" 22 #include "unicode/parseerr.h" 23 #include "unicode/localpointer.h" 24 25 #if !UCONFIG_NO_NORMALIZATION 26 27 28 #if U_SHOW_CPLUSPLUS_API 29 #include "unicode/unistr.h" 30 #include "unicode/uniset.h" 31 #endif 32 33 34 /** 35 * \file 36 * \brief Unicode Security and Spoofing Detection, C API. 37 * 38 * These functions are intended to check strings, typically 39 * identifiers of some type, such as URLs, for the presence of 40 * characters that are likely to be visually confusing - 41 * for cases where the displayed form of an identifier may 42 * not be what it appears to be. 43 * 44 * Unicode Technical Report #36, http://unicode.org/reports/tr36, and 45 * Unicode Technical Standard #39, http://unicode.org/reports/tr39 46 * "Unicode security considerations", give more background on 47 * security an spoofing issues with Unicode identifiers. 48 * The tests and checks provided by this module implement the recommendations 49 * from those Unicode documents. 50 * 51 * The tests available on identifiers fall into two general categories: 52 * -# Single identifier tests. Check whether an identifier is 53 * potentially confusable with any other string, or is suspicious 54 * for other reasons. 55 * -# Two identifier tests. Check whether two specific identifiers are confusable. 56 * This does not consider whether either of strings is potentially 57 * confusable with any string other than the exact one specified. 58 * 59 * The steps to perform confusability testing are 60 * -# Open a USpoofChecker. 61 * -# Configure the USPoofChecker for the desired set of tests. The tests that will 62 * be performed are specified by a set of USpoofChecks flags. 63 * -# Perform the checks using the pre-configured USpoofChecker. The results indicate 64 * which (if any) of the selected tests have identified possible problems with the identifier. 65 * Results are reported as a set of USpoofChecks flags; this mirrors the form in which 66 * the set of tests to perform was originally specified to the USpoofChecker. 67 * 68 * A USpoofChecker may be used repeatedly to perform checks on any number of identifiers. 69 * 70 * Thread Safety: The test functions for checking a single identifier, or for testing 71 * whether two identifiers are possible confusable, are thread safe. 72 * They may called concurrently, from multiple threads, using the same USpoofChecker instance. 73 * 74 * More generally, the standard ICU thread safety rules apply: functions that take a 75 * const USpoofChecker parameter are thread safe. Those that take a non-const 76 * USpoofChecier are not thread safe. 77 * 78 * 79 * Descriptions of the available checks. 80 * 81 * When testing whether pairs of identifiers are confusable, with the uspoof_areConfusable() 82 * family of functions, the relevant tests are 83 * 84 * -# USPOOF_SINGLE_SCRIPT_CONFUSABLE: All of the characters from the two identifiers are 85 * from a single script, and the two identifiers are visually confusable. 86 * -# USPOOF_MIXED_SCRIPT_CONFUSABLE: At least one of the identifiers contains characters 87 * from more than one script, and the two identifiers are visually confusable. 88 * -# USPOOF_WHOLE_SCRIPT_CONFUSABLE: Each of the two identifiers is of a single script, but 89 * the two identifiers are from different scripts, and they are visually confusable. 90 * 91 * The safest approach is to enable all three of these checks as a group. 92 * 93 * USPOOF_ANY_CASE is a modifier for the above tests. If the identifiers being checked can 94 * be of mixed case and are used in a case-sensitive manner, this option should be specified. 95 * 96 * If the identifiers being checked are used in a case-insensitive manner, and if they are 97 * displayed to users in lower-case form only, the USPOOF_ANY_CASE option should not be 98 * specified. Confusabality issues involving upper case letters will not be reported. 99 * 100 * When performing tests on a single identifier, with the uspoof_check() family of functions, 101 * the relevant tests are: 102 * 103 * -# USPOOF_MIXED_SCRIPT_CONFUSABLE: the identifier contains characters from multiple 104 * scripts, and there exists an identifier of a single script that is visually confusable. 105 * -# USPOOF_WHOLE_SCRIPT_CONFUSABLE: the identifier consists of characters from a single 106 * script, and there exists a visually confusable identifier. 107 * The visually confusable identifier also consists of characters from a single script. 108 * but not the same script as the identifier being checked. 109 * -# USPOOF_ANY_CASE: modifies the mixed script and whole script confusables tests. If 110 * specified, the checks will consider confusable characters of any case. If this flag is not 111 * set, the test is performed assuming case folded identifiers. 112 * -# USPOOF_SINGLE_SCRIPT: check that the identifier contains only characters from a 113 * single script. (Characters from the 'common' and 'inherited' scripts are ignored.) 114 * This is not a test for confusable identifiers 115 * -# USPOOF_INVISIBLE: check an identifier for the presence of invisible characters, 116 * such as zero-width spaces, or character sequences that are 117 * likely not to display, such as multiple occurrences of the same 118 * non-spacing mark. This check does not test the input string as a whole 119 * for conformance to any particular syntax for identifiers. 120 * -# USPOOF_CHAR_LIMIT: check that an identifier contains only characters from a specified set 121 * of acceptable characters. See uspoof_setAllowedChars() and 122 * uspoof_setAllowedLocales(). 123 * 124 * Note on Scripts: 125 * Characters from the Unicode Scripts "Common" and "Inherited" are ignored when considering 126 * the script of an identifier. Common characters include digits and symbols that 127 * are normally used with text from more than one script. 128 * 129 * Identifier Skeletons: A skeleton is a transformation of an identifier, such that 130 * all identifiers that are confusable with each other have the same skeleton. 131 * Using skeletons, it is possible to build a dictionary data structure for 132 * a set of identifiers, and then quickly test whether a new identifier is 133 * confusable with an identifier already in the set. The uspoof_getSkeleton() 134 * family of functions will produce the skeleton from an identifier. 135 * 136 * Note that skeletons are not guaranteed to be stable between versions 137 * of Unicode or ICU, so an applications should not rely on creating a permanent, 138 * or difficult to update, database of skeletons. Instabilities result from 139 * identifying new pairs or sequences of characters that are visually 140 * confusable, and thus must be mapped to the same skeleton character(s). 141 * 142 * Skeletons are computed using the algorithm and data describe in Unicode UAX 39. 143 * The latest proposed update, UAX 39 Version 8 draft 1, says "the tables SL, SA, and ML 144 * were still problematic, and discouraged from use in [Uniocde] 7.0. 145 * They were thus removed from version 8.0" 146 * 147 * In light of this, the default mapping data included with ICU 55 uses the 148 * Unicode 7 MA (Multi script Any case) table data for the other type options 149 * (Single Script, Any Case), (Single Script, Lower Case) and (Multi Script, Lower Case). 150 */ 151 152 struct USpoofChecker; 153 typedef struct USpoofChecker USpoofChecker; /**< typedef for C of USpoofChecker */ 154 155 /** 156 * Enum for the kinds of checks that USpoofChecker can perform. 157 * These enum values are used both to select the set of checks that 158 * will be performed, and to report results from the check function. 159 * 160 * @stable ICU 4.2 161 */ 162 typedef enum USpoofChecks { 163 /** Single script confusable test. 164 * When testing whether two identifiers are confusable, report that they are if 165 * both are from the same script and they are visually confusable. 166 * Note: this test is not applicable to a check of a single identifier. 167 */ 168 USPOOF_SINGLE_SCRIPT_CONFUSABLE = 1, 169 170 /** Mixed script confusable test. 171 * When checking a single identifier, report a problem if 172 * the identifier contains multiple scripts, and 173 * is confusable with some other identifier in a single script 174 * When testing whether two identifiers are confusable, report that they are if 175 * the two IDs are visually confusable, 176 * and at least one contains characters from more than one script. 177 */ 178 USPOOF_MIXED_SCRIPT_CONFUSABLE = 2, 179 180 /** Whole script confusable test. 181 * When checking a single identifier, report a problem if 182 * The identifier is of a single script, and 183 * there exists a confusable identifier in another script. 184 * When testing whether two identifiers are confusable, report that they are if 185 * each is of a single script, 186 * the scripts of the two identifiers are different, and 187 * the identifiers are visually confusable. 188 */ 189 USPOOF_WHOLE_SCRIPT_CONFUSABLE = 4, 190 191 /** Any Case Modifier for confusable identifier tests. 192 If specified, consider all characters, of any case, when looking for confusables. 193 If USPOOF_ANY_CASE is not specified, identifiers being checked are assumed to have been 194 case folded. Upper case confusable characters will not be checked. 195 Selects between Lower Case Confusable and 196 Any Case Confusable. */ 197 USPOOF_ANY_CASE = 8, 198 199 /** 200 * Check that an identifier is no looser than the specified RestrictionLevel. 201 * The default if uspoof_setRestrctionLevel() is not called is HIGHLY_RESTRICTIVE. 202 * 203 * If USPOOF_AUX_INFO is enabled the actual restriction level of the 204 * identifier being tested will also be returned by uspoof_check(). 205 * 206 * @see URestrictionLevel 207 * @see uspoof_setRestrictionLevel 208 * @see USPOOF_AUX_INFO 209 * 210 * @stable ICU 51 211 */ 212 USPOOF_RESTRICTION_LEVEL = 16, 213 214 #ifndef U_HIDE_DEPRECATED_API 215 /** Check that an identifier contains only characters from a 216 * single script (plus chars from the common and inherited scripts.) 217 * Applies to checks of a single identifier check only. 218 * @deprecated ICU 51 Use RESTRICTION_LEVEL instead. 219 */ 220 USPOOF_SINGLE_SCRIPT = USPOOF_RESTRICTION_LEVEL, 221 #endif /* U_HIDE_DEPRECATED_API */ 222 223 /** Check an identifier for the presence of invisible characters, 224 * such as zero-width spaces, or character sequences that are 225 * likely not to display, such as multiple occurrences of the same 226 * non-spacing mark. This check does not test the input string as a whole 227 * for conformance to any particular syntax for identifiers. 228 */ 229 USPOOF_INVISIBLE = 32, 230 231 /** Check that an identifier contains only characters from a specified set 232 * of acceptable characters. See uspoof_setAllowedChars() and 233 * uspoof_setAllowedLocales(). 234 */ 235 USPOOF_CHAR_LIMIT = 64, 236 237 /** 238 * Check that an identifier does not include decimal digits from 239 * more than one numbering system. 240 * 241 * @stable ICU 51 242 */ 243 USPOOF_MIXED_NUMBERS = 128, 244 245 /** 246 * Enable all spoof checks. 247 * 248 * @stable ICU 4.6 249 */ 250 USPOOF_ALL_CHECKS = 0xFFFF, 251 252 /** 253 * Enable the return of auxillary (non-error) information in the 254 * upper bits of the check results value. 255 * 256 * If this "check" is not enabled, the results of uspoof_check() will be zero when an 257 * identifier passes all of the enabled checks. 258 * 259 * If this "check" is enabled, (uspoof_check() & USPOOF_ALL_CHECKS) will be zero 260 * when an identifier passes all checks. 261 * 262 * @stable ICU 51 263 */ 264 USPOOF_AUX_INFO = 0x40000000 265 266 } USpoofChecks; 267 268 269 /** 270 * Constants from UAX #39 for use in setRestrictionLevel(), and 271 * for returned identifier restriction levels in check results. 272 * @stable ICU 51 273 */ 274 typedef enum URestrictionLevel { 275 /** 276 * Only ASCII characters: U+0000..U+007F 277 * 278 * @stable ICU 51 279 */ 280 USPOOF_ASCII = 0x10000000, 281 /** 282 * All characters in each identifier must be from a single script. 283 * 284 * @stable ICU 53 285 */ 286 USPOOF_SINGLE_SCRIPT_RESTRICTIVE = 0x20000000, 287 /** 288 * All characters in each identifier must be from a single script, or from the combinations: Latin + Han + 289 * Hiragana + Katakana; Latin + Han + Bopomofo; or Latin + Han + Hangul. Note that this level will satisfy the 290 * vast majority of Latin-script users; also that TR36 has ASCII instead of Latin. 291 * 292 * @stable ICU 51 293 */ 294 USPOOF_HIGHLY_RESTRICTIVE = 0x30000000, 295 /** 296 * Allow Latin with other scripts except Cyrillic, Greek, Cherokee Otherwise, the same as Highly Restrictive 297 * 298 * @stable ICU 51 299 */ 300 USPOOF_MODERATELY_RESTRICTIVE = 0x40000000, 301 /** 302 * Allow arbitrary mixtures of scripts. Otherwise, the same as Moderately Restrictive. 303 * 304 * @stable ICU 51 305 */ 306 USPOOF_MINIMALLY_RESTRICTIVE = 0x50000000, 307 /** 308 * Any valid identifiers, including characters outside of the Identifier Profile. 309 * 310 * @stable ICU 51 311 */ 312 USPOOF_UNRESTRICTIVE = 0x60000000, 313 /** 314 * Mask for selecting the Restriction Level bits from the return value of uspoof_check(). 315 * 316 * @stable ICU 53 317 */ 318 USPOOF_RESTRICTION_LEVEL_MASK = 0x7F000000 319 } URestrictionLevel; 320 321 /** 322 * Create a Unicode Spoof Checker, configured to perform all 323 * checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT. 324 * Note that additional checks may be added in the future, 325 * resulting in the changes to the default checking behavior. 326 * 327 * @param status The error code, set if this function encounters a problem. 328 * @return the newly created Spoof Checker 329 * @stable ICU 4.2 330 */ 331 U_STABLE USpoofChecker * U_EXPORT2 332 uspoof_open(UErrorCode *status); 333 334 335 /** 336 * Open a Spoof checker from its serialized form, stored in 32-bit-aligned memory. 337 * Inverse of uspoof_serialize(). 338 * The memory containing the serialized data must remain valid and unchanged 339 * as long as the spoof checker, or any cloned copies of the spoof checker, 340 * are in use. Ownership of the memory remains with the caller. 341 * The spoof checker (and any clones) must be closed prior to deleting the 342 * serialized data. 343 * 344 * @param data a pointer to 32-bit-aligned memory containing the serialized form of spoof data 345 * @param length the number of bytes available at data; 346 * can be more than necessary 347 * @param pActualLength receives the actual number of bytes at data taken up by the data; 348 * can be NULL 349 * @param pErrorCode ICU error code 350 * @return the spoof checker. 351 * 352 * @see uspoof_open 353 * @see uspoof_serialize 354 * @stable ICU 4.2 355 */ 356 U_STABLE USpoofChecker * U_EXPORT2 357 uspoof_openFromSerialized(const void *data, int32_t length, int32_t *pActualLength, 358 UErrorCode *pErrorCode); 359 360 /** 361 * Open a Spoof Checker from the source form of the spoof data. 362 * The two inputs correspond to the Unicode data files confusables.txt 363 * and confusablesWholeScript.txt as described in Unicode UAX #39. 364 * The syntax of the source data is as described in UAX #39 for 365 * these files, and the content of these files is acceptable input. 366 * 367 * The character encoding of the (char *) input text is UTF-8. 368 * 369 * @param confusables a pointer to the confusable characters definitions, 370 * as found in file confusables.txt from unicode.org. 371 * @param confusablesLen The length of the confusables text, or -1 if the 372 * input string is zero terminated. 373 * @param confusablesWholeScript 374 * a pointer to the whole script confusables definitions, 375 * as found in the file confusablesWholeScript.txt from unicode.org. 376 * @param confusablesWholeScriptLen The length of the whole script confusables text, or 377 * -1 if the input string is zero terminated. 378 * @param errType In the event of an error in the input, indicates 379 * which of the input files contains the error. 380 * The value is one of USPOOF_SINGLE_SCRIPT_CONFUSABLE or 381 * USPOOF_WHOLE_SCRIPT_CONFUSABLE, or 382 * zero if no errors are found. 383 * @param pe In the event of an error in the input, receives the position 384 * in the input text (line, offset) of the error. 385 * @param status an in/out ICU UErrorCode. Among the possible errors is 386 * U_PARSE_ERROR, which is used to report syntax errors 387 * in the input. 388 * @return A spoof checker that uses the rules from the input files. 389 * @stable ICU 4.2 390 */ 391 U_STABLE USpoofChecker * U_EXPORT2 392 uspoof_openFromSource(const char *confusables, int32_t confusablesLen, 393 const char *confusablesWholeScript, int32_t confusablesWholeScriptLen, 394 int32_t *errType, UParseError *pe, UErrorCode *status); 395 396 397 /** 398 * Close a Spoof Checker, freeing any memory that was being held by 399 * its implementation. 400 * @stable ICU 4.2 401 */ 402 U_STABLE void U_EXPORT2 403 uspoof_close(USpoofChecker *sc); 404 405 #if U_SHOW_CPLUSPLUS_API 406 407 U_NAMESPACE_BEGIN 408 409 /** 410 * \class LocalUSpoofCheckerPointer 411 * "Smart pointer" class, closes a USpoofChecker via uspoof_close(). 412 * For most methods see the LocalPointerBase base class. 413 * 414 * @see LocalPointerBase 415 * @see LocalPointer 416 * @stable ICU 4.4 417 */ 418 U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckerPointer, USpoofChecker, uspoof_close); 419 420 U_NAMESPACE_END 421 422 #endif 423 424 /** 425 * Clone a Spoof Checker. The clone will be set to perform the same checks 426 * as the original source. 427 * 428 * @param sc The source USpoofChecker 429 * @param status The error code, set if this function encounters a problem. 430 * @return 431 * @stable ICU 4.2 432 */ 433 U_STABLE USpoofChecker * U_EXPORT2 434 uspoof_clone(const USpoofChecker *sc, UErrorCode *status); 435 436 437 /** 438 * Specify the set of checks that will be performed by the check 439 * functions of this Spoof Checker. 440 * 441 * @param sc The USpoofChecker 442 * @param checks The set of checks that this spoof checker will perform. 443 * The value is a bit set, obtained by OR-ing together 444 * values from enum USpoofChecks. 445 * @param status The error code, set if this function encounters a problem. 446 * @stable ICU 4.2 447 * 448 */ 449 U_STABLE void U_EXPORT2 450 uspoof_setChecks(USpoofChecker *sc, int32_t checks, UErrorCode *status); 451 452 /** 453 * Get the set of checks that this Spoof Checker has been configured to perform. 454 * 455 * @param sc The USpoofChecker 456 * @param status The error code, set if this function encounters a problem. 457 * @return The set of checks that this spoof checker will perform. 458 * The value is a bit set, obtained by OR-ing together 459 * values from enum USpoofChecks. 460 * @stable ICU 4.2 461 * 462 */ 463 U_STABLE int32_t U_EXPORT2 464 uspoof_getChecks(const USpoofChecker *sc, UErrorCode *status); 465 466 /** 467 * Set the loosest restriction level allowed. The default if this function 468 * is not called is HIGHLY_RESTRICTIVE. 469 * Calling this function also enables the RESTRICTION_LEVEL check. 470 * @param restrictionLevel The loosest restriction level allowed. 471 * @see URestrictionLevel 472 * @stable ICU 51 473 */ 474 U_STABLE void U_EXPORT2 475 uspoof_setRestrictionLevel(USpoofChecker *sc, URestrictionLevel restrictionLevel); 476 477 478 /** 479 * Get the Restriction Level that will be tested if the checks include RESTRICTION_LEVEL. 480 * 481 * @return The restriction level 482 * @see URestrictionLevel 483 * @stable ICU 51 484 */ 485 U_STABLE URestrictionLevel U_EXPORT2 486 uspoof_getRestrictionLevel(const USpoofChecker *sc); 487 488 /** 489 * Limit characters that are acceptable in identifiers being checked to those 490 * normally used with the languages associated with the specified locales. 491 * Any previously specified list of locales is replaced by the new settings. 492 * 493 * A set of languages is determined from the locale(s), and 494 * from those a set of acceptable Unicode scripts is determined. 495 * Characters from this set of scripts, along with characters from 496 * the "common" and "inherited" Unicode Script categories 497 * will be permitted. 498 * 499 * Supplying an empty string removes all restrictions; 500 * characters from any script will be allowed. 501 * 502 * The USPOOF_CHAR_LIMIT test is automatically enabled for this 503 * USpoofChecker when calling this function with a non-empty list 504 * of locales. 505 * 506 * The Unicode Set of characters that will be allowed is accessible 507 * via the uspoof_getAllowedChars() function. uspoof_setAllowedLocales() 508 * will <i>replace</i> any previously applied set of allowed characters. 509 * 510 * Adjustments, such as additions or deletions of certain classes of characters, 511 * can be made to the result of uspoof_setAllowedLocales() by 512 * fetching the resulting set with uspoof_getAllowedChars(), 513 * manipulating it with the Unicode Set API, then resetting the 514 * spoof detectors limits with uspoof_setAllowedChars() 515 * 516 * @param sc The USpoofChecker 517 * @param localesList A list list of locales, from which the language 518 * and associated script are extracted. The locales 519 * are comma-separated if there is more than one. 520 * White space may not appear within an individual locale, 521 * but is ignored otherwise. 522 * The locales are syntactically like those from the 523 * HTTP Accept-Language header. 524 * If the localesList is empty, no restrictions will be placed on 525 * the allowed characters. 526 * 527 * @param status The error code, set if this function encounters a problem. 528 * @stable ICU 4.2 529 */ 530 U_STABLE void U_EXPORT2 531 uspoof_setAllowedLocales(USpoofChecker *sc, const char *localesList, UErrorCode *status); 532 533 /** 534 * Get a list of locales for the scripts that are acceptable in strings 535 * to be checked. If no limitations on scripts have been specified, 536 * an empty string will be returned. 537 * 538 * uspoof_setAllowedChars() will reset the list of allowed to be empty. 539 * 540 * The format of the returned list is the same as that supplied to 541 * uspoof_setAllowedLocales(), but returned list may not be identical 542 * to the originally specified string; the string may be reformatted, 543 * and information other than languages from 544 * the originally specified locales may be omitted. 545 * 546 * @param sc The USpoofChecker 547 * @param status The error code, set if this function encounters a problem. 548 * @return A string containing a list of locales corresponding 549 * to the acceptable scripts, formatted like an 550 * HTTP Accept Language value. 551 * 552 * @stable ICU 4.2 553 */ 554 U_STABLE const char * U_EXPORT2 555 uspoof_getAllowedLocales(USpoofChecker *sc, UErrorCode *status); 556 557 558 /** 559 * Limit the acceptable characters to those specified by a Unicode Set. 560 * Any previously specified character limit is 561 * is replaced by the new settings. This includes limits on 562 * characters that were set with the uspoof_setAllowedLocales() function. 563 * 564 * The USPOOF_CHAR_LIMIT test is automatically enabled for this 565 * USpoofChecker by this function. 566 * 567 * @param sc The USpoofChecker 568 * @param chars A Unicode Set containing the list of 569 * characters that are permitted. Ownership of the set 570 * remains with the caller. The incoming set is cloned by 571 * this function, so there are no restrictions on modifying 572 * or deleting the USet after calling this function. 573 * @param status The error code, set if this function encounters a problem. 574 * @stable ICU 4.2 575 */ 576 U_STABLE void U_EXPORT2 577 uspoof_setAllowedChars(USpoofChecker *sc, const USet *chars, UErrorCode *status); 578 579 580 /** 581 * Get a USet for the characters permitted in an identifier. 582 * This corresponds to the limits imposed by the Set Allowed Characters 583 * functions. Limitations imposed by other checks will not be 584 * reflected in the set returned by this function. 585 * 586 * The returned set will be frozen, meaning that it cannot be modified 587 * by the caller. 588 * 589 * Ownership of the returned set remains with the Spoof Detector. The 590 * returned set will become invalid if the spoof detector is closed, 591 * or if a new set of allowed characters is specified. 592 * 593 * 594 * @param sc The USpoofChecker 595 * @param status The error code, set if this function encounters a problem. 596 * @return A USet containing the characters that are permitted by 597 * the USPOOF_CHAR_LIMIT test. 598 * @stable ICU 4.2 599 */ 600 U_STABLE const USet * U_EXPORT2 601 uspoof_getAllowedChars(const USpoofChecker *sc, UErrorCode *status); 602 603 604 #if U_SHOW_CPLUSPLUS_API 605 /** 606 * Limit the acceptable characters to those specified by a Unicode Set. 607 * Any previously specified character limit is 608 * is replaced by the new settings. This includes limits on 609 * characters that were set with the uspoof_setAllowedLocales() function. 610 * 611 * The USPOOF_CHAR_LIMIT test is automatically enabled for this 612 * USoofChecker by this function. 613 * 614 * @param sc The USpoofChecker 615 * @param chars A Unicode Set containing the list of 616 * characters that are permitted. Ownership of the set 617 * remains with the caller. The incoming set is cloned by 618 * this function, so there are no restrictions on modifying 619 * or deleting the UnicodeSet after calling this function. 620 * @param status The error code, set if this function encounters a problem. 621 * @stable ICU 4.2 622 */ 623 U_STABLE void U_EXPORT2 624 uspoof_setAllowedUnicodeSet(USpoofChecker *sc, const icu::UnicodeSet *chars, UErrorCode *status); 625 626 627 /** 628 * Get a UnicodeSet for the characters permitted in an identifier. 629 * This corresponds to the limits imposed by the Set Allowed Characters / 630 * UnicodeSet functions. Limitations imposed by other checks will not be 631 * reflected in the set returned by this function. 632 * 633 * The returned set will be frozen, meaning that it cannot be modified 634 * by the caller. 635 * 636 * Ownership of the returned set remains with the Spoof Detector. The 637 * returned set will become invalid if the spoof detector is closed, 638 * or if a new set of allowed characters is specified. 639 * 640 * 641 * @param sc The USpoofChecker 642 * @param status The error code, set if this function encounters a problem. 643 * @return A UnicodeSet containing the characters that are permitted by 644 * the USPOOF_CHAR_LIMIT test. 645 * @stable ICU 4.2 646 */ 647 U_STABLE const icu::UnicodeSet * U_EXPORT2 648 uspoof_getAllowedUnicodeSet(const USpoofChecker *sc, UErrorCode *status); 649 #endif 650 651 652 /** 653 * Check the specified string for possible security issues. 654 * The text to be checked will typically be an identifier of some sort. 655 * The set of checks to be performed is specified with uspoof_setChecks(). 656 * 657 * @param sc The USpoofChecker 658 * @param id The identifier to be checked for possible security issues, 659 * in UTF-16 format. 660 * @param length the length of the string to be checked, expressed in 661 * 16 bit UTF-16 code units, or -1 if the string is 662 * zero terminated. 663 * @param position An out parameter. 664 * Originally, the index of the first string position that failed a check. 665 * Now, always returns zero. 666 * This parameter may be null. 667 * @param status The error code, set if an error occurred while attempting to 668 * perform the check. 669 * Spoofing or security issues detected with the input string are 670 * not reported here, but through the function's return value. 671 * @return An integer value with bits set for any potential security 672 * or spoofing issues detected. The bits are defined by 673 * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) 674 * will be zero if the input string passes all of the 675 * enabled checks. 676 * @stable ICU 4.2 677 */ 678 U_STABLE int32_t U_EXPORT2 679 uspoof_check(const USpoofChecker *sc, 680 const UChar *id, int32_t length, 681 int32_t *position, 682 UErrorCode *status); 683 684 685 /** 686 * Check the specified string for possible security issues. 687 * The text to be checked will typically be an identifier of some sort. 688 * The set of checks to be performed is specified with uspoof_setChecks(). 689 * 690 * @param sc The USpoofChecker 691 * @param id A identifier to be checked for possible security issues, in UTF8 format. 692 * @param length the length of the string to be checked, or -1 if the string is 693 * zero terminated. 694 * @param position An out parameter. 695 * Originally, the index of the first string position that failed a check. 696 * Now, always returns zero. 697 * This parameter may be null. 698 * @deprecated ICU 51 699 * @param status The error code, set if an error occurred while attempting to 700 * perform the check. 701 * Spoofing or security issues detected with the input string are 702 * not reported here, but through the function's return value. 703 * If the input contains invalid UTF-8 sequences, 704 * a status of U_INVALID_CHAR_FOUND will be returned. 705 * @return An integer value with bits set for any potential security 706 * or spoofing issues detected. The bits are defined by 707 * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) 708 * will be zero if the input string passes all of the 709 * enabled checks. 710 * @stable ICU 4.2 711 */ 712 U_STABLE int32_t U_EXPORT2 713 uspoof_checkUTF8(const USpoofChecker *sc, 714 const char *id, int32_t length, 715 int32_t *position, 716 UErrorCode *status); 717 718 719 #if U_SHOW_CPLUSPLUS_API 720 /** 721 * Check the specified string for possible security issues. 722 * The text to be checked will typically be an identifier of some sort. 723 * The set of checks to be performed is specified with uspoof_setChecks(). 724 * 725 * @param sc The USpoofChecker 726 * @param id A identifier to be checked for possible security issues. 727 * @param position An out parameter. 728 * Originally, the index of the first string position that failed a check. 729 * Now, always returns zero. 730 * This parameter may be null. 731 * @deprecated ICU 51 732 * @param status The error code, set if an error occurred while attempting to 733 * perform the check. 734 * Spoofing or security issues detected with the input string are 735 * not reported here, but through the function's return value. 736 * @return An integer value with bits set for any potential security 737 * or spoofing issues detected. The bits are defined by 738 * enum USpoofChecks. (returned_value & USPOOF_ALL_CHECKS) 739 * will be zero if the input string passes all of the 740 * enabled checks. 741 * @stable ICU 4.2 742 */ 743 U_STABLE int32_t U_EXPORT2 744 uspoof_checkUnicodeString(const USpoofChecker *sc, 745 const icu::UnicodeString &id, 746 int32_t *position, 747 UErrorCode *status); 748 749 #endif 750 751 752 /** 753 * Check the whether two specified strings are visually confusable. 754 * The types of confusability to be tested - single script, mixed script, 755 * or whole script - are determined by the check options set for the 756 * USpoofChecker. 757 * 758 * The tests to be performed are controlled by the flags 759 * USPOOF_SINGLE_SCRIPT_CONFUSABLE 760 * USPOOF_MIXED_SCRIPT_CONFUSABLE 761 * USPOOF_WHOLE_SCRIPT_CONFUSABLE 762 * At least one of these tests must be selected. 763 * 764 * USPOOF_ANY_CASE is a modifier for the tests. Select it if the identifiers 765 * may be of mixed case. 766 * If identifiers are case folded for comparison and 767 * display to the user, do not select the USPOOF_ANY_CASE option. 768 * 769 * 770 * @param sc The USpoofChecker 771 * @param id1 The first of the two identifiers to be compared for 772 * confusability. The strings are in UTF-16 format. 773 * @param length1 the length of the first identifer, expressed in 774 * 16 bit UTF-16 code units, or -1 if the string is 775 * nul terminated. 776 * @param id2 The second of the two identifiers to be compared for 777 * confusability. The identifiers are in UTF-16 format. 778 * @param length2 The length of the second identifiers, expressed in 779 * 16 bit UTF-16 code units, or -1 if the string is 780 * nul terminated. 781 * @param status The error code, set if an error occurred while attempting to 782 * perform the check. 783 * Confusability of the identifiers is not reported here, 784 * but through this function's return value. 785 * @return An integer value with bit(s) set corresponding to 786 * the type of confusability found, as defined by 787 * enum USpoofChecks. Zero is returned if the identifiers 788 * are not confusable. 789 * @stable ICU 4.2 790 */ 791 U_STABLE int32_t U_EXPORT2 792 uspoof_areConfusable(const USpoofChecker *sc, 793 const UChar *id1, int32_t length1, 794 const UChar *id2, int32_t length2, 795 UErrorCode *status); 796 797 798 799 /** 800 * Check the whether two specified strings are visually confusable. 801 * The types of confusability to be tested - single script, mixed script, 802 * or whole script - are determined by the check options set for the 803 * USpoofChecker. 804 * 805 * @param sc The USpoofChecker 806 * @param id1 The first of the two identifiers to be compared for 807 * confusability. The strings are in UTF-8 format. 808 * @param length1 the length of the first identifiers, in bytes, or -1 809 * if the string is nul terminated. 810 * @param id2 The second of the two identifiers to be compared for 811 * confusability. The strings are in UTF-8 format. 812 * @param length2 The length of the second string in bytes, or -1 813 * if the string is nul terminated. 814 * @param status The error code, set if an error occurred while attempting to 815 * perform the check. 816 * Confusability of the strings is not reported here, 817 * but through this function's return value. 818 * @return An integer value with bit(s) set corresponding to 819 * the type of confusability found, as defined by 820 * enum USpoofChecks. Zero is returned if the strings 821 * are not confusable. 822 * @stable ICU 4.2 823 */ 824 U_STABLE int32_t U_EXPORT2 825 uspoof_areConfusableUTF8(const USpoofChecker *sc, 826 const char *id1, int32_t length1, 827 const char *id2, int32_t length2, 828 UErrorCode *status); 829 830 831 832 833 #if U_SHOW_CPLUSPLUS_API 834 /** 835 * Check the whether two specified strings are visually confusable. 836 * The types of confusability to be tested - single script, mixed script, 837 * or whole script - are determined by the check options set for the 838 * USpoofChecker. 839 * 840 * @param sc The USpoofChecker 841 * @param s1 The first of the two identifiers to be compared for 842 * confusability. The strings are in UTF-8 format. 843 * @param s2 The second of the two identifiers to be compared for 844 * confusability. The strings are in UTF-8 format. 845 * @param status The error code, set if an error occurred while attempting to 846 * perform the check. 847 * Confusability of the identifiers is not reported here, 848 * but through this function's return value. 849 * @return An integer value with bit(s) set corresponding to 850 * the type of confusability found, as defined by 851 * enum USpoofChecks. Zero is returned if the identifiers 852 * are not confusable. 853 * @stable ICU 4.2 854 */ 855 U_STABLE int32_t U_EXPORT2 856 uspoof_areConfusableUnicodeString(const USpoofChecker *sc, 857 const icu::UnicodeString &s1, 858 const icu::UnicodeString &s2, 859 UErrorCode *status); 860 #endif 861 862 863 /** 864 * Get the "skeleton" for an identifier. 865 * Skeletons are a transformation of the input identifier; 866 * Two identifiers are confusable if their skeletons are identical. 867 * See Unicode UAX #39 for additional information. 868 * 869 * Using skeletons directly makes it possible to quickly check 870 * whether an identifier is confusable with any of some large 871 * set of existing identifiers, by creating an efficiently 872 * searchable collection of the skeletons. 873 * 874 * @param sc The USpoofChecker 875 * @param type The type of skeleton, corresponding to which 876 * of the Unicode confusable data tables to use. 877 * The default is Mixed-Script, Lowercase. 878 * Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and 879 * USPOOF_ANY_CASE. The two flags may be ORed. 880 * @param id The input identifier whose skeleton will be computed. 881 * @param length The length of the input identifier, expressed in 16 bit 882 * UTF-16 code units, or -1 if the string is zero terminated. 883 * @param dest The output buffer, to receive the skeleton string. 884 * @param destCapacity The length of the output buffer, in 16 bit units. 885 * The destCapacity may be zero, in which case the function will 886 * return the actual length of the skeleton. 887 * @param status The error code, set if an error occurred while attempting to 888 * perform the check. 889 * @return The length of the skeleton string. The returned length 890 * is always that of the complete skeleton, even when the 891 * supplied buffer is too small (or of zero length) 892 * 893 * @stable ICU 4.2 894 */ 895 U_STABLE int32_t U_EXPORT2 896 uspoof_getSkeleton(const USpoofChecker *sc, 897 uint32_t type, 898 const UChar *id, int32_t length, 899 UChar *dest, int32_t destCapacity, 900 UErrorCode *status); 901 902 /** 903 * Get the "skeleton" for an identifier. 904 * Skeletons are a transformation of the input identifier; 905 * Two identifiers are confusable if their skeletons are identical. 906 * See Unicode UAX #39 for additional information. 907 * 908 * Using skeletons directly makes it possible to quickly check 909 * whether an identifier is confusable with any of some large 910 * set of existing identifiers, by creating an efficiently 911 * searchable collection of the skeletons. 912 * 913 * @param sc The USpoofChecker 914 * @param type The type of skeleton, corresponding to which 915 * of the Unicode confusable data tables to use. 916 * The default is Mixed-Script, Lowercase. 917 * Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and 918 * USPOOF_ANY_CASE. The two flags may be ORed. 919 * @param id The UTF-8 format identifier whose skeleton will be computed. 920 * @param length The length of the input string, in bytes, 921 * or -1 if the string is zero terminated. 922 * @param dest The output buffer, to receive the skeleton string. 923 * @param destCapacity The length of the output buffer, in bytes. 924 * The destCapacity may be zero, in which case the function will 925 * return the actual length of the skeleton. 926 * @param status The error code, set if an error occurred while attempting to 927 * perform the check. Possible Errors include U_INVALID_CHAR_FOUND 928 * for invalid UTF-8 sequences, and 929 * U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small 930 * to hold the complete skeleton. 931 * @return The length of the skeleton string, in bytes. The returned length 932 * is always that of the complete skeleton, even when the 933 * supplied buffer is too small (or of zero length) 934 * 935 * @stable ICU 4.2 936 */ 937 U_STABLE int32_t U_EXPORT2 938 uspoof_getSkeletonUTF8(const USpoofChecker *sc, 939 uint32_t type, 940 const char *id, int32_t length, 941 char *dest, int32_t destCapacity, 942 UErrorCode *status); 943 944 #if U_SHOW_CPLUSPLUS_API 945 /** 946 * Get the "skeleton" for an identifier. 947 * Skeletons are a transformation of the input identifier; 948 * Two identifiers are confusable if their skeletons are identical. 949 * See Unicode UAX #39 for additional information. 950 * 951 * Using skeletons directly makes it possible to quickly check 952 * whether an identifier is confusable with any of some large 953 * set of existing identifiers, by creating an efficiently 954 * searchable collection of the skeletons. 955 * 956 * @param sc The USpoofChecker. 957 * @param type The type of skeleton, corresponding to which 958 * of the Unicode confusable data tables to use. 959 * The default is Mixed-Script, Lowercase. 960 * Allowed options are USPOOF_SINGLE_SCRIPT_CONFUSABLE and 961 * USPOOF_ANY_CASE. The two flags may be ORed. 962 * @param id The input identifier whose skeleton will be computed. 963 * @param dest The output identifier, to receive the skeleton string. 964 * @param status The error code, set if an error occurred while attempting to 965 * perform the check. 966 * @return A reference to the destination (skeleton) string. 967 * 968 * @stable ICU 4.2 969 */ 970 U_I18N_API icu::UnicodeString & U_EXPORT2 971 uspoof_getSkeletonUnicodeString(const USpoofChecker *sc, 972 uint32_t type, 973 const icu::UnicodeString &id, 974 icu::UnicodeString &dest, 975 UErrorCode *status); 976 #endif /* U_SHOW_CPLUSPLUS_API */ 977 978 /** 979 * Get the set of Candidate Characters for Inclusion in Identifiers, as defined 980 * in Unicode UAX #31, http://www.unicode.org/reports/tr31/#Table_Candidate_Characters_for_Inclusion_in_Identifiers 981 * 982 * The returned set is frozen. Ownership of the set remains with the ICU library; it must not 983 * be deleted by the caller. 984 * 985 * @param status The error code, set if a problem occurs while creating the set. 986 * 987 * @stable ICU 51 988 */ 989 U_STABLE const USet * U_EXPORT2 990 uspoof_getInclusionSet(UErrorCode *status); 991 992 /** 993 * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined 994 * in Unicode UAX #31, http://www.unicode.org/reports/tr31/#Table_Recommended_Scripts 995 * 996 * The returned set is frozen. Ownership of the set remains with the ICU library; it must not 997 * be deleted by the caller. 998 * 999 * @param status The error code, set if a problem occurs while creating the set. 1000 * 1001 * @stable ICU 51 1002 */ 1003 U_STABLE const USet * U_EXPORT2 1004 uspoof_getRecommendedSet(UErrorCode *status); 1005 1006 #if U_SHOW_CPLUSPLUS_API 1007 1008 /** 1009 * Get the set of Candidate Characters for Inclusion in Identifiers, as defined 1010 * in Unicode UAX #31, http://www.unicode.org/reports/tr31/#Table_Candidate_Characters_for_Inclusion_in_Identifiers 1011 * 1012 * The returned set is frozen. Ownership of the set remains with the ICU library; it must not 1013 * be deleted by the caller. 1014 * 1015 * @param status The error code, set if a problem occurs while creating the set. 1016 * 1017 * @stable ICU 51 1018 */ 1019 U_STABLE const icu::UnicodeSet * U_EXPORT2 1020 uspoof_getInclusionUnicodeSet(UErrorCode *status); 1021 1022 /** 1023 * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined 1024 * in Unicode UAX #31, http://www.unicode.org/reports/tr31/#Table_Recommended_Scripts 1025 * 1026 * The returned set is frozen. Ownership of the set remains with the ICU library; it must not 1027 * be deleted by the caller. 1028 * 1029 * @param status The error code, set if a problem occurs while creating the set. 1030 * 1031 * @stable ICU 51 1032 */ 1033 U_STABLE const icu::UnicodeSet * U_EXPORT2 1034 uspoof_getRecommendedUnicodeSet(UErrorCode *status); 1035 1036 #endif /* U_SHOW_CPLUSPLUS_API */ 1037 1038 /** 1039 * Serialize the data for a spoof detector into a chunk of memory. 1040 * The flattened spoof detection tables can later be used to efficiently 1041 * instantiate a new Spoof Detector. 1042 * 1043 * The serialized spoof checker includes only the data compiled from the 1044 * Unicode data tables by uspoof_openFromSource(); it does not include 1045 * include any other state or configuration that may have been set. 1046 * 1047 * @param sc the Spoof Detector whose data is to be serialized. 1048 * @param data a pointer to 32-bit-aligned memory to be filled with the data, 1049 * can be NULL if capacity==0 1050 * @param capacity the number of bytes available at data, 1051 * or 0 for preflighting 1052 * @param status an in/out ICU UErrorCode; possible errors include: 1053 * - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization 1054 * - U_ILLEGAL_ARGUMENT_ERROR the data or capacity parameters are bad 1055 * @return the number of bytes written or needed for the spoof data 1056 * 1057 * @see utrie2_openFromSerialized() 1058 * @stable ICU 4.2 1059 */ 1060 U_STABLE int32_t U_EXPORT2 1061 uspoof_serialize(USpoofChecker *sc, 1062 void *data, int32_t capacity, 1063 UErrorCode *status); 1064 1065 1066 #endif 1067 1068 #endif /* USPOOF_H */ 1069
