1 /* a_strex.c */ 2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include <string.h> 61 #include "cryptlib.h" 62 #include <openssl/crypto.h> 63 #include <openssl/x509.h> 64 #include <openssl/asn1.h> 65 66 #include "charmap.h" 67 68 /* ASN1_STRING_print_ex() and X509_NAME_print_ex(). 69 * Enhanced string and name printing routines handling 70 * multibyte characters, RFC2253 and a host of other 71 * options. 72 */ 73 74 75 #define CHARTYPE_BS_ESC (ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253) 76 77 #define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \ 78 ASN1_STRFLGS_ESC_QUOTE | \ 79 ASN1_STRFLGS_ESC_CTRL | \ 80 ASN1_STRFLGS_ESC_MSB) 81 82 83 /* Three IO functions for sending data to memory, a BIO and 84 * and a FILE pointer. 85 */ 86 #if 0 /* never used */ 87 static int send_mem_chars(void *arg, const void *buf, int len) 88 { 89 unsigned char **out = arg; 90 if(!out) return 1; 91 memcpy(*out, buf, len); 92 *out += len; 93 return 1; 94 } 95 #endif 96 97 static int send_bio_chars(void *arg, const void *buf, int len) 98 { 99 if(!arg) return 1; 100 if(BIO_write(arg, buf, len) != len) return 0; 101 return 1; 102 } 103 104 static int send_fp_chars(void *arg, const void *buf, int len) 105 { 106 if(!arg) return 1; 107 if(fwrite(buf, 1, len, arg) != (unsigned int)len) return 0; 108 return 1; 109 } 110 111 typedef int char_io(void *arg, const void *buf, int len); 112 113 /* This function handles display of 114 * strings, one character at a time. 115 * It is passed an unsigned long for each 116 * character because it could come from 2 or even 117 * 4 byte forms. 118 */ 119 120 static int do_esc_char(unsigned long c, unsigned char flags, char *do_quotes, char_io *io_ch, void *arg) 121 { 122 unsigned char chflgs, chtmp; 123 char tmphex[HEX_SIZE(long)+3]; 124 125 if(c > 0xffffffffL) 126 return -1; 127 if(c > 0xffff) { 128 BIO_snprintf(tmphex, sizeof tmphex, "\\W%08lX", c); 129 if(!io_ch(arg, tmphex, 10)) return -1; 130 return 10; 131 } 132 if(c > 0xff) { 133 BIO_snprintf(tmphex, sizeof tmphex, "\\U%04lX", c); 134 if(!io_ch(arg, tmphex, 6)) return -1; 135 return 6; 136 } 137 chtmp = (unsigned char)c; 138 if(chtmp > 0x7f) chflgs = flags & ASN1_STRFLGS_ESC_MSB; 139 else chflgs = char_type[chtmp] & flags; 140 if(chflgs & CHARTYPE_BS_ESC) { 141 /* If we don't escape with quotes, signal we need quotes */ 142 if(chflgs & ASN1_STRFLGS_ESC_QUOTE) { 143 if(do_quotes) *do_quotes = 1; 144 if(!io_ch(arg, &chtmp, 1)) return -1; 145 return 1; 146 } 147 if(!io_ch(arg, "\\", 1)) return -1; 148 if(!io_ch(arg, &chtmp, 1)) return -1; 149 return 2; 150 } 151 if(chflgs & (ASN1_STRFLGS_ESC_CTRL|ASN1_STRFLGS_ESC_MSB)) { 152 BIO_snprintf(tmphex, 11, "\\%02X", chtmp); 153 if(!io_ch(arg, tmphex, 3)) return -1; 154 return 3; 155 } 156 /* If we get this far and do any escaping at all must escape 157 * the escape character itself: backslash. 158 */ 159 if (chtmp == '\\' && flags & ESC_FLAGS) { 160 if(!io_ch(arg, "\\\\", 2)) return -1; 161 return 2; 162 } 163 if(!io_ch(arg, &chtmp, 1)) return -1; 164 return 1; 165 } 166 167 #define BUF_TYPE_WIDTH_MASK 0x7 168 #define BUF_TYPE_CONVUTF8 0x8 169 170 /* This function sends each character in a buffer to 171 * do_esc_char(). It interprets the content formats 172 * and converts to or from UTF8 as appropriate. 173 */ 174 175 static int do_buf(unsigned char *buf, int buflen, 176 int type, unsigned char flags, char *quotes, char_io *io_ch, void *arg) 177 { 178 int i, outlen, len; 179 unsigned char orflags, *p, *q; 180 unsigned long c; 181 p = buf; 182 q = buf + buflen; 183 outlen = 0; 184 while(p != q) { 185 if(p == buf && flags & ASN1_STRFLGS_ESC_2253) orflags = CHARTYPE_FIRST_ESC_2253; 186 else orflags = 0; 187 switch(type & BUF_TYPE_WIDTH_MASK) { 188 case 4: 189 c = ((unsigned long)*p++) << 24; 190 c |= ((unsigned long)*p++) << 16; 191 c |= ((unsigned long)*p++) << 8; 192 c |= *p++; 193 break; 194 195 case 2: 196 c = ((unsigned long)*p++) << 8; 197 c |= *p++; 198 break; 199 200 case 1: 201 c = *p++; 202 break; 203 204 case 0: 205 i = UTF8_getc(p, buflen, &c); 206 if(i < 0) return -1; /* Invalid UTF8String */ 207 p += i; 208 break; 209 default: 210 return -1; /* invalid width */ 211 } 212 if (p == q && flags & ASN1_STRFLGS_ESC_2253) orflags = CHARTYPE_LAST_ESC_2253; 213 if(type & BUF_TYPE_CONVUTF8) { 214 unsigned char utfbuf[6]; 215 int utflen; 216 utflen = UTF8_putc(utfbuf, sizeof utfbuf, c); 217 for(i = 0; i < utflen; i++) { 218 /* We don't need to worry about setting orflags correctly 219 * because if utflen==1 its value will be correct anyway 220 * otherwise each character will be > 0x7f and so the 221 * character will never be escaped on first and last. 222 */ 223 len = do_esc_char(utfbuf[i], (unsigned char)(flags | orflags), quotes, io_ch, arg); 224 if(len < 0) return -1; 225 outlen += len; 226 } 227 } else { 228 len = do_esc_char(c, (unsigned char)(flags | orflags), quotes, io_ch, arg); 229 if(len < 0) return -1; 230 outlen += len; 231 } 232 } 233 return outlen; 234 } 235 236 /* This function hex dumps a buffer of characters */ 237 238 static int do_hex_dump(char_io *io_ch, void *arg, unsigned char *buf, int buflen) 239 { 240 static const char hexdig[] = "0123456789ABCDEF"; 241 unsigned char *p, *q; 242 char hextmp[2]; 243 if(arg) { 244 p = buf; 245 q = buf + buflen; 246 while(p != q) { 247 hextmp[0] = hexdig[*p >> 4]; 248 hextmp[1] = hexdig[*p & 0xf]; 249 if(!io_ch(arg, hextmp, 2)) return -1; 250 p++; 251 } 252 } 253 return buflen << 1; 254 } 255 256 /* "dump" a string. This is done when the type is unknown, 257 * or the flags request it. We can either dump the content 258 * octets or the entire DER encoding. This uses the RFC2253 259 * #01234 format. 260 */ 261 262 static int do_dump(unsigned long lflags, char_io *io_ch, void *arg, ASN1_STRING *str) 263 { 264 /* Placing the ASN1_STRING in a temp ASN1_TYPE allows 265 * the DER encoding to readily obtained 266 */ 267 ASN1_TYPE t; 268 unsigned char *der_buf, *p; 269 int outlen, der_len; 270 271 if(!io_ch(arg, "#", 1)) return -1; 272 /* If we don't dump DER encoding just dump content octets */ 273 if(!(lflags & ASN1_STRFLGS_DUMP_DER)) { 274 outlen = do_hex_dump(io_ch, arg, str->data, str->length); 275 if(outlen < 0) return -1; 276 return outlen + 1; 277 } 278 t.type = str->type; 279 t.value.ptr = (char *)str; 280 der_len = i2d_ASN1_TYPE(&t, NULL); 281 der_buf = OPENSSL_malloc(der_len); 282 if(!der_buf) return -1; 283 p = der_buf; 284 i2d_ASN1_TYPE(&t, &p); 285 outlen = do_hex_dump(io_ch, arg, der_buf, der_len); 286 OPENSSL_free(der_buf); 287 if(outlen < 0) return -1; 288 return outlen + 1; 289 } 290 291 /* Lookup table to convert tags to character widths, 292 * 0 = UTF8 encoded, -1 is used for non string types 293 * otherwise it is the number of bytes per character 294 */ 295 296 static const signed char tag2nbyte[] = { 297 -1, -1, -1, -1, -1, /* 0-4 */ 298 -1, -1, -1, -1, -1, /* 5-9 */ 299 -1, -1, 0, -1, /* 10-13 */ 300 -1, -1, -1, -1, /* 15-17 */ 301 -1, 1, 1, /* 18-20 */ 302 -1, 1, 1, 1, /* 21-24 */ 303 -1, 1, -1, /* 25-27 */ 304 4, -1, 2 /* 28-30 */ 305 }; 306 307 /* This is the main function, print out an 308 * ASN1_STRING taking note of various escape 309 * and display options. Returns number of 310 * characters written or -1 if an error 311 * occurred. 312 */ 313 314 static int do_print_ex(char_io *io_ch, void *arg, unsigned long lflags, ASN1_STRING *str) 315 { 316 int outlen, len; 317 int type; 318 char quotes; 319 unsigned char flags; 320 quotes = 0; 321 /* Keep a copy of escape flags */ 322 flags = (unsigned char)(lflags & ESC_FLAGS); 323 324 type = str->type; 325 326 outlen = 0; 327 328 329 if(lflags & ASN1_STRFLGS_SHOW_TYPE) { 330 const char *tagname; 331 tagname = ASN1_tag2str(type); 332 outlen += strlen(tagname); 333 if(!io_ch(arg, tagname, outlen) || !io_ch(arg, ":", 1)) return -1; 334 outlen++; 335 } 336 337 /* Decide what to do with type, either dump content or display it */ 338 339 /* Dump everything */ 340 if(lflags & ASN1_STRFLGS_DUMP_ALL) type = -1; 341 /* Ignore the string type */ 342 else if(lflags & ASN1_STRFLGS_IGNORE_TYPE) type = 1; 343 else { 344 /* Else determine width based on type */ 345 if((type > 0) && (type < 31)) type = tag2nbyte[type]; 346 else type = -1; 347 if((type == -1) && !(lflags & ASN1_STRFLGS_DUMP_UNKNOWN)) type = 1; 348 } 349 350 if(type == -1) { 351 len = do_dump(lflags, io_ch, arg, str); 352 if(len < 0) return -1; 353 outlen += len; 354 return outlen; 355 } 356 357 if(lflags & ASN1_STRFLGS_UTF8_CONVERT) { 358 /* Note: if string is UTF8 and we want 359 * to convert to UTF8 then we just interpret 360 * it as 1 byte per character to avoid converting 361 * twice. 362 */ 363 if(!type) type = 1; 364 else type |= BUF_TYPE_CONVUTF8; 365 } 366 367 len = do_buf(str->data, str->length, type, flags, "es, io_ch, NULL); 368 if(len < 0) return -1; 369 outlen += len; 370 if(quotes) outlen += 2; 371 if(!arg) return outlen; 372 if(quotes && !io_ch(arg, "\"", 1)) return -1; 373 if(do_buf(str->data, str->length, type, flags, NULL, io_ch, arg) < 0) 374 return -1; 375 if(quotes && !io_ch(arg, "\"", 1)) return -1; 376 return outlen; 377 } 378 379 /* Used for line indenting: print 'indent' spaces */ 380 381 static int do_indent(char_io *io_ch, void *arg, int indent) 382 { 383 int i; 384 for(i = 0; i < indent; i++) 385 if(!io_ch(arg, " ", 1)) return 0; 386 return 1; 387 } 388 389 #define FN_WIDTH_LN 25 390 #define FN_WIDTH_SN 10 391 392 static int do_name_ex(char_io *io_ch, void *arg, X509_NAME *n, 393 int indent, unsigned long flags) 394 { 395 int i, prev = -1, orflags, cnt; 396 int fn_opt, fn_nid; 397 ASN1_OBJECT *fn; 398 ASN1_STRING *val; 399 X509_NAME_ENTRY *ent; 400 char objtmp[80]; 401 const char *objbuf; 402 int outlen, len; 403 char *sep_dn, *sep_mv, *sep_eq; 404 int sep_dn_len, sep_mv_len, sep_eq_len; 405 if(indent < 0) indent = 0; 406 outlen = indent; 407 if(!do_indent(io_ch, arg, indent)) return -1; 408 switch (flags & XN_FLAG_SEP_MASK) 409 { 410 case XN_FLAG_SEP_MULTILINE: 411 sep_dn = "\n"; 412 sep_dn_len = 1; 413 sep_mv = " + "; 414 sep_mv_len = 3; 415 break; 416 417 case XN_FLAG_SEP_COMMA_PLUS: 418 sep_dn = ","; 419 sep_dn_len = 1; 420 sep_mv = "+"; 421 sep_mv_len = 1; 422 indent = 0; 423 break; 424 425 case XN_FLAG_SEP_CPLUS_SPC: 426 sep_dn = ", "; 427 sep_dn_len = 2; 428 sep_mv = " + "; 429 sep_mv_len = 3; 430 indent = 0; 431 break; 432 433 case XN_FLAG_SEP_SPLUS_SPC: 434 sep_dn = "; "; 435 sep_dn_len = 2; 436 sep_mv = " + "; 437 sep_mv_len = 3; 438 indent = 0; 439 break; 440 441 default: 442 return -1; 443 } 444 445 if(flags & XN_FLAG_SPC_EQ) { 446 sep_eq = " = "; 447 sep_eq_len = 3; 448 } else { 449 sep_eq = "="; 450 sep_eq_len = 1; 451 } 452 453 fn_opt = flags & XN_FLAG_FN_MASK; 454 455 cnt = X509_NAME_entry_count(n); 456 for(i = 0; i < cnt; i++) { 457 if(flags & XN_FLAG_DN_REV) 458 ent = X509_NAME_get_entry(n, cnt - i - 1); 459 else ent = X509_NAME_get_entry(n, i); 460 if(prev != -1) { 461 if(prev == ent->set) { 462 if(!io_ch(arg, sep_mv, sep_mv_len)) return -1; 463 outlen += sep_mv_len; 464 } else { 465 if(!io_ch(arg, sep_dn, sep_dn_len)) return -1; 466 outlen += sep_dn_len; 467 if(!do_indent(io_ch, arg, indent)) return -1; 468 outlen += indent; 469 } 470 } 471 prev = ent->set; 472 fn = X509_NAME_ENTRY_get_object(ent); 473 val = X509_NAME_ENTRY_get_data(ent); 474 fn_nid = OBJ_obj2nid(fn); 475 if(fn_opt != XN_FLAG_FN_NONE) { 476 int objlen, fld_len; 477 if((fn_opt == XN_FLAG_FN_OID) || (fn_nid==NID_undef) ) { 478 OBJ_obj2txt(objtmp, sizeof objtmp, fn, 1); 479 fld_len = 0; /* XXX: what should this be? */ 480 objbuf = objtmp; 481 } else { 482 if(fn_opt == XN_FLAG_FN_SN) { 483 fld_len = FN_WIDTH_SN; 484 objbuf = OBJ_nid2sn(fn_nid); 485 } else if(fn_opt == XN_FLAG_FN_LN) { 486 fld_len = FN_WIDTH_LN; 487 objbuf = OBJ_nid2ln(fn_nid); 488 } else { 489 fld_len = 0; /* XXX: what should this be? */ 490 objbuf = ""; 491 } 492 } 493 objlen = strlen(objbuf); 494 if(!io_ch(arg, objbuf, objlen)) return -1; 495 if ((objlen < fld_len) && (flags & XN_FLAG_FN_ALIGN)) { 496 if (!do_indent(io_ch, arg, fld_len - objlen)) return -1; 497 outlen += fld_len - objlen; 498 } 499 if(!io_ch(arg, sep_eq, sep_eq_len)) return -1; 500 outlen += objlen + sep_eq_len; 501 } 502 /* If the field name is unknown then fix up the DER dump 503 * flag. We might want to limit this further so it will 504 * DER dump on anything other than a few 'standard' fields. 505 */ 506 if((fn_nid == NID_undef) && (flags & XN_FLAG_DUMP_UNKNOWN_FIELDS)) 507 orflags = ASN1_STRFLGS_DUMP_ALL; 508 else orflags = 0; 509 510 len = do_print_ex(io_ch, arg, flags | orflags, val); 511 if(len < 0) return -1; 512 outlen += len; 513 } 514 return outlen; 515 } 516 517 /* Wrappers round the main functions */ 518 519 int X509_NAME_print_ex(BIO *out, X509_NAME *nm, int indent, unsigned long flags) 520 { 521 if(flags == XN_FLAG_COMPAT) 522 return X509_NAME_print(out, nm, indent); 523 return do_name_ex(send_bio_chars, out, nm, indent, flags); 524 } 525 526 #ifndef OPENSSL_NO_FP_API 527 int X509_NAME_print_ex_fp(FILE *fp, X509_NAME *nm, int indent, unsigned long flags) 528 { 529 if(flags == XN_FLAG_COMPAT) 530 { 531 BIO *btmp; 532 int ret; 533 btmp = BIO_new_fp(fp, BIO_NOCLOSE); 534 if(!btmp) return -1; 535 ret = X509_NAME_print(btmp, nm, indent); 536 BIO_free(btmp); 537 return ret; 538 } 539 return do_name_ex(send_fp_chars, fp, nm, indent, flags); 540 } 541 #endif 542 543 int ASN1_STRING_print_ex(BIO *out, ASN1_STRING *str, unsigned long flags) 544 { 545 return do_print_ex(send_bio_chars, out, flags, str); 546 } 547 548 #ifndef OPENSSL_NO_FP_API 549 int ASN1_STRING_print_ex_fp(FILE *fp, ASN1_STRING *str, unsigned long flags) 550 { 551 return do_print_ex(send_fp_chars, fp, flags, str); 552 } 553 #endif 554 555 /* Utility function: convert any string type to UTF8, returns number of bytes 556 * in output string or a negative error code 557 */ 558 559 int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in) 560 { 561 ASN1_STRING stmp, *str = &stmp; 562 int mbflag, type, ret; 563 if(!in) return -1; 564 type = in->type; 565 if((type < 0) || (type > 30)) return -1; 566 mbflag = tag2nbyte[type]; 567 if(mbflag == -1) return -1; 568 mbflag |= MBSTRING_FLAG; 569 stmp.data = NULL; 570 stmp.length = 0; 571 ret = ASN1_mbstring_copy(&str, in->data, in->length, mbflag, B_ASN1_UTF8STRING); 572 if(ret < 0) return ret; 573 *out = stmp.data; 574 return stmp.length; 575 } 576
