1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 #include "curl_setup.h" 24 25 #if defined(USE_GSKIT) || defined(USE_NSS) || defined(USE_GNUTLS) || \ 26 defined(USE_CYASSL) || defined(USE_SCHANNEL) 27 28 #include <curl/curl.h> 29 #include "urldata.h" 30 #include "strequal.h" 31 #include "hostcheck.h" 32 #include "vtls/vtls.h" 33 #include "sendf.h" 34 #include "inet_pton.h" 35 #include "curl_base64.h" 36 #include "x509asn1.h" 37 38 /* The last 3 #include files should be in this order */ 39 #include "curl_printf.h" 40 #include "curl_memory.h" 41 #include "memdebug.h" 42 43 44 /* ASN.1 OIDs. */ 45 static const char cnOID[] = "2.5.4.3"; /* Common name. */ 46 static const char sanOID[] = "2.5.29.17"; /* Subject alternative name. */ 47 48 static const curl_OID OIDtable[] = { 49 { "1.2.840.10040.4.1", "dsa" }, 50 { "1.2.840.10040.4.3", "dsa-with-sha1" }, 51 { "1.2.840.10045.2.1", "ecPublicKey" }, 52 { "1.2.840.10045.3.0.1", "c2pnb163v1" }, 53 { "1.2.840.10045.4.1", "ecdsa-with-SHA1" }, 54 { "1.2.840.10046.2.1", "dhpublicnumber" }, 55 { "1.2.840.113549.1.1.1", "rsaEncryption" }, 56 { "1.2.840.113549.1.1.2", "md2WithRSAEncryption" }, 57 { "1.2.840.113549.1.1.4", "md5WithRSAEncryption" }, 58 { "1.2.840.113549.1.1.5", "sha1WithRSAEncryption" }, 59 { "1.2.840.113549.1.1.10", "RSASSA-PSS" }, 60 { "1.2.840.113549.1.1.14", "sha224WithRSAEncryption" }, 61 { "1.2.840.113549.1.1.11", "sha256WithRSAEncryption" }, 62 { "1.2.840.113549.1.1.12", "sha384WithRSAEncryption" }, 63 { "1.2.840.113549.1.1.13", "sha512WithRSAEncryption" }, 64 { "1.2.840.113549.2.2", "md2" }, 65 { "1.2.840.113549.2.5", "md5" }, 66 { "1.3.14.3.2.26", "sha1" }, 67 { cnOID, "CN" }, 68 { "2.5.4.4", "SN" }, 69 { "2.5.4.5", "serialNumber" }, 70 { "2.5.4.6", "C" }, 71 { "2.5.4.7", "L" }, 72 { "2.5.4.8", "ST" }, 73 { "2.5.4.9", "streetAddress" }, 74 { "2.5.4.10", "O" }, 75 { "2.5.4.11", "OU" }, 76 { "2.5.4.12", "title" }, 77 { "2.5.4.13", "description" }, 78 { "2.5.4.17", "postalCode" }, 79 { "2.5.4.41", "name" }, 80 { "2.5.4.42", "givenName" }, 81 { "2.5.4.43", "initials" }, 82 { "2.5.4.44", "generationQualifier" }, 83 { "2.5.4.45", "X500UniqueIdentifier" }, 84 { "2.5.4.46", "dnQualifier" }, 85 { "2.5.4.65", "pseudonym" }, 86 { "1.2.840.113549.1.9.1", "emailAddress" }, 87 { "2.5.4.72", "role" }, 88 { sanOID, "subjectAltName" }, 89 { "2.5.29.18", "issuerAltName" }, 90 { "2.5.29.19", "basicConstraints" }, 91 { "2.16.840.1.101.3.4.2.4", "sha224" }, 92 { "2.16.840.1.101.3.4.2.1", "sha256" }, 93 { "2.16.840.1.101.3.4.2.2", "sha384" }, 94 { "2.16.840.1.101.3.4.2.3", "sha512" }, 95 { (const char *) NULL, (const char *) NULL } 96 }; 97 98 /* 99 * Lightweight ASN.1 parser. 100 * In particular, it does not check for syntactic/lexical errors. 101 * It is intended to support certificate information gathering for SSL backends 102 * that offer a mean to get certificates as a whole, but do not supply 103 * entry points to get particular certificate sub-fields. 104 * Please note there is no pretention here to rewrite a full SSL library. 105 */ 106 107 108 const char * Curl_getASN1Element(curl_asn1Element * elem, 109 const char * beg, const char * end) 110 { 111 unsigned char b; 112 unsigned long len; 113 curl_asn1Element lelem; 114 115 /* Get a single ASN.1 element into `elem', parse ASN.1 string at `beg' 116 ending at `end'. 117 Returns a pointer in source string after the parsed element, or NULL 118 if an error occurs. */ 119 120 if(beg >= end || !*beg) 121 return (const char *) NULL; 122 123 /* Process header byte. */ 124 elem->header = beg; 125 b = (unsigned char) *beg++; 126 elem->constructed = (b & 0x20) != 0; 127 elem->class = (b >> 6) & 3; 128 b &= 0x1F; 129 if(b == 0x1F) 130 return (const char *) NULL; /* Long tag values not supported here. */ 131 elem->tag = b; 132 133 /* Process length. */ 134 if(beg >= end) 135 return (const char *) NULL; 136 b = (unsigned char) *beg++; 137 if(!(b & 0x80)) 138 len = b; 139 else if(!(b &= 0x7F)) { 140 /* Unspecified length. Since we have all the data, we can determine the 141 effective length by skipping element until an end element is found. */ 142 if(!elem->constructed) 143 return (const char *) NULL; 144 elem->beg = beg; 145 while(beg < end && *beg) { 146 beg = Curl_getASN1Element(&lelem, beg, end); 147 if(!beg) 148 return (const char *) NULL; 149 } 150 if(beg >= end) 151 return (const char *) NULL; 152 elem->end = beg; 153 return beg + 1; 154 } 155 else if(beg + b > end) 156 return (const char *) NULL; /* Does not fit in source. */ 157 else { 158 /* Get long length. */ 159 len = 0; 160 do { 161 if(len & 0xFF000000L) 162 return (const char *) NULL; /* Lengths > 32 bits are not supported. */ 163 len = (len << 8) | (unsigned char) *beg++; 164 } while(--b); 165 } 166 if((unsigned long) (end - beg) < len) 167 return (const char *) NULL; /* Element data does not fit in source. */ 168 elem->beg = beg; 169 elem->end = beg + len; 170 return elem->end; 171 } 172 173 static const curl_OID * searchOID(const char * oid) 174 { 175 const curl_OID * op; 176 177 /* Search the null terminated OID or OID identifier in local table. 178 Return the table entry pointer or NULL if not found. */ 179 180 for(op = OIDtable; op->numoid; op++) 181 if(!strcmp(op->numoid, oid) || curl_strequal(op->textoid, oid)) 182 return op; 183 184 return (const curl_OID *) NULL; 185 } 186 187 static const char * bool2str(const char * beg, const char * end) 188 { 189 /* Convert an ASN.1 Boolean value into its string representation. 190 Return the dynamically allocated string, or NULL if source is not an 191 ASN.1 Boolean value. */ 192 193 if(end - beg != 1) 194 return (const char *) NULL; 195 return strdup(*beg? "TRUE": "FALSE"); 196 } 197 198 static const char * octet2str(const char * beg, const char * end) 199 { 200 size_t n = end - beg; 201 char * buf; 202 203 /* Convert an ASN.1 octet string to a printable string. 204 Return the dynamically allocated string, or NULL if an error occurs. */ 205 206 buf = malloc(3 * n + 1); 207 if(buf) 208 for(n = 0; beg < end; n += 3) 209 snprintf(buf + n, 4, "%02x:", *(const unsigned char *) beg++); 210 return buf; 211 } 212 213 static const char * bit2str(const char * beg, const char * end) 214 { 215 /* Convert an ASN.1 bit string to a printable string. 216 Return the dynamically allocated string, or NULL if an error occurs. */ 217 218 if(++beg > end) 219 return (const char *) NULL; 220 return octet2str(beg, end); 221 } 222 223 static const char * int2str(const char * beg, const char * end) 224 { 225 long val = 0; 226 size_t n = end - beg; 227 228 /* Convert an ASN.1 integer value into its string representation. 229 Return the dynamically allocated string, or NULL if source is not an 230 ASN.1 integer value. */ 231 232 if(!n) 233 return (const char *) NULL; 234 235 if(n > 4) 236 return octet2str(beg, end); 237 238 /* Represent integers <= 32-bit as a single value. */ 239 if(*beg & 0x80) 240 val = ~val; 241 242 do 243 val = (val << 8) | *(const unsigned char *) beg++; 244 while(beg < end); 245 return curl_maprintf("%s%lx", (val < 0 || val >= 10)? "0x": "", val); 246 } 247 248 static ssize_t 249 utf8asn1str(char * * to, int type, const char * from, const char * end) 250 { 251 size_t inlength = end - from; 252 int size = 1; 253 size_t outlength; 254 int charsize; 255 unsigned int wc; 256 char * buf; 257 258 /* Perform a lazy conversion from an ASN.1 typed string to UTF8. Allocate the 259 destination buffer dynamically. The allocation size will normally be too 260 large: this is to avoid buffer overflows. 261 Terminate the string with a nul byte and return the converted 262 string length. */ 263 264 *to = (char *) NULL; 265 switch (type) { 266 case CURL_ASN1_BMP_STRING: 267 size = 2; 268 break; 269 case CURL_ASN1_UNIVERSAL_STRING: 270 size = 4; 271 break; 272 case CURL_ASN1_NUMERIC_STRING: 273 case CURL_ASN1_PRINTABLE_STRING: 274 case CURL_ASN1_TELETEX_STRING: 275 case CURL_ASN1_IA5_STRING: 276 case CURL_ASN1_VISIBLE_STRING: 277 case CURL_ASN1_UTF8_STRING: 278 break; 279 default: 280 return -1; /* Conversion not supported. */ 281 } 282 283 if(inlength % size) 284 return -1; /* Length inconsistent with character size. */ 285 buf = malloc(4 * (inlength / size) + 1); 286 if(!buf) 287 return -1; /* Not enough memory. */ 288 289 if(type == CURL_ASN1_UTF8_STRING) { 290 /* Just copy. */ 291 outlength = inlength; 292 if(outlength) 293 memcpy(buf, from, outlength); 294 } 295 else { 296 for(outlength = 0; from < end;) { 297 wc = 0; 298 switch (size) { 299 case 4: 300 wc = (wc << 8) | *(const unsigned char *) from++; 301 wc = (wc << 8) | *(const unsigned char *) from++; 302 /* fallthrough */ 303 case 2: 304 wc = (wc << 8) | *(const unsigned char *) from++; 305 /* fallthrough */ 306 default: /* case 1: */ 307 wc = (wc << 8) | *(const unsigned char *) from++; 308 } 309 charsize = 1; 310 if(wc >= 0x00000080) { 311 if(wc >= 0x00000800) { 312 if(wc >= 0x00010000) { 313 if(wc >= 0x00200000) { 314 free(buf); 315 return -1; /* Invalid char. size for target encoding. */ 316 } 317 buf[outlength + 3] = (char) (0x80 | (wc & 0x3F)); 318 wc = (wc >> 6) | 0x00010000; 319 charsize++; 320 } 321 buf[outlength + 2] = (char) (0x80 | (wc & 0x3F)); 322 wc = (wc >> 6) | 0x00000800; 323 charsize++; 324 } 325 buf[outlength + 1] = (char) (0x80 | (wc & 0x3F)); 326 wc = (wc >> 6) | 0x000000C0; 327 charsize++; 328 } 329 buf[outlength] = (char) wc; 330 outlength += charsize; 331 } 332 } 333 buf[outlength] = '\0'; 334 *to = buf; 335 return outlength; 336 } 337 338 static const char * string2str(int type, const char * beg, const char * end) 339 { 340 char * buf; 341 342 /* Convert an ASN.1 String into its UTF-8 string representation. 343 Return the dynamically allocated string, or NULL if an error occurs. */ 344 345 if(utf8asn1str(&buf, type, beg, end) < 0) 346 return (const char *) NULL; 347 return buf; 348 } 349 350 static int encodeUint(char * buf, int n, unsigned int x) 351 { 352 int i = 0; 353 unsigned int y = x / 10; 354 355 /* Decimal ASCII encode unsigned integer `x' in the `n'-byte buffer at `buf'. 356 Return the total number of encoded digits, even if larger than `n'. */ 357 358 if(y) { 359 i += encodeUint(buf, n, y); 360 x -= y * 10; 361 } 362 if(i < n) 363 buf[i] = (char) ('0' + x); 364 i++; 365 if(i < n) 366 buf[i] = '\0'; /* Store a terminator if possible. */ 367 return i; 368 } 369 370 static int encodeOID(char * buf, int n, const char * beg, const char * end) 371 { 372 int i = 0; 373 unsigned int x; 374 unsigned int y; 375 376 /* Convert an ASN.1 OID into its dotted string representation. 377 Store the result in th `n'-byte buffer at `buf'. 378 Return the converted string length, or -1 if an error occurs. */ 379 380 /* Process the first two numbers. */ 381 y = *(const unsigned char *) beg++; 382 x = y / 40; 383 y -= x * 40; 384 i += encodeUint(buf + i, n - i, x); 385 if(i < n) 386 buf[i] = '.'; 387 i++; 388 i += encodeUint(buf + i, n - i, y); 389 390 /* Process the trailing numbers. */ 391 while(beg < end) { 392 if(i < n) 393 buf[i] = '.'; 394 i++; 395 x = 0; 396 do { 397 if(x & 0xFF000000) 398 return -1; 399 y = *(const unsigned char *) beg++; 400 x = (x << 7) | (y & 0x7F); 401 } while(y & 0x80); 402 i += encodeUint(buf + i, n - i, x); 403 } 404 if(i < n) 405 buf[i] = '\0'; 406 return i; 407 } 408 409 static const char * OID2str(const char * beg, const char * end, bool symbolic) 410 { 411 char * buf = (char *) NULL; 412 const curl_OID * op; 413 int n; 414 415 /* Convert an ASN.1 OID into its dotted or symbolic string representation. 416 Return the dynamically allocated string, or NULL if an error occurs. */ 417 418 if(beg < end) { 419 n = encodeOID((char *) NULL, -1, beg, end); 420 if(n >= 0) { 421 buf = malloc(n + 1); 422 if(buf) { 423 encodeOID(buf, n, beg, end); 424 buf[n] = '\0'; 425 426 if(symbolic) { 427 op = searchOID(buf); 428 if(op) { 429 free(buf); 430 buf = strdup(op->textoid); 431 } 432 } 433 } 434 } 435 } 436 return buf; 437 } 438 439 static const char * GTime2str(const char * beg, const char * end) 440 { 441 const char * tzp; 442 const char * fracp; 443 char sec1, sec2; 444 size_t fracl; 445 size_t tzl; 446 const char * sep = ""; 447 448 /* Convert an ASN.1 Generalized time to a printable string. 449 Return the dynamically allocated string, or NULL if an error occurs. */ 450 451 for(fracp = beg; fracp < end && *fracp >= '0' && *fracp <= '9'; fracp++) 452 ; 453 454 /* Get seconds digits. */ 455 sec1 = '0'; 456 switch (fracp - beg - 12) { 457 case 0: 458 sec2 = '0'; 459 break; 460 case 2: 461 sec1 = fracp[-2]; 462 case 1: 463 sec2 = fracp[-1]; 464 break; 465 default: 466 return (const char *) NULL; 467 } 468 469 /* Scan for timezone, measure fractional seconds. */ 470 tzp = fracp; 471 fracl = 0; 472 if(fracp < end && (*fracp == '.' || *fracp == ',')) { 473 fracp++; 474 do 475 tzp++; 476 while(tzp < end && *tzp >= '0' && *tzp <= '9'); 477 /* Strip leading zeroes in fractional seconds. */ 478 for(fracl = tzp - fracp - 1; fracl && fracp[fracl - 1] == '0'; fracl--) 479 ; 480 } 481 482 /* Process timezone. */ 483 if(tzp >= end) 484 ; /* Nothing to do. */ 485 else if(*tzp == 'Z') { 486 tzp = " GMT"; 487 end = tzp + 4; 488 } 489 else { 490 sep = " "; 491 tzp++; 492 } 493 494 tzl = end - tzp; 495 return curl_maprintf("%.4s-%.2s-%.2s %.2s:%.2s:%c%c%s%.*s%s%.*s", 496 beg, beg + 4, beg + 6, 497 beg + 8, beg + 10, sec1, sec2, 498 fracl? ".": "", fracl, fracp, 499 sep, tzl, tzp); 500 } 501 502 static const char * UTime2str(const char * beg, const char * end) 503 { 504 const char * tzp; 505 size_t tzl; 506 const char * sec; 507 508 /* Convert an ASN.1 UTC time to a printable string. 509 Return the dynamically allocated string, or NULL if an error occurs. */ 510 511 for(tzp = beg; tzp < end && *tzp >= '0' && *tzp <= '9'; tzp++) 512 ; 513 /* Get the seconds. */ 514 sec = beg + 10; 515 switch (tzp - sec) { 516 case 0: 517 sec = "00"; 518 case 2: 519 break; 520 default: 521 return (const char *) NULL; 522 } 523 524 /* Process timezone. */ 525 if(tzp >= end) 526 return (const char *) NULL; 527 if(*tzp == 'Z') { 528 tzp = "GMT"; 529 end = tzp + 3; 530 } 531 else 532 tzp++; 533 534 tzl = end - tzp; 535 return curl_maprintf("%u%.2s-%.2s-%.2s %.2s:%.2s:%.2s %.*s", 536 20 - (*beg >= '5'), beg, beg + 2, beg + 4, 537 beg + 6, beg + 8, sec, 538 tzl, tzp); 539 } 540 541 const char * Curl_ASN1tostr(curl_asn1Element * elem, int type) 542 { 543 /* Convert an ASN.1 element to a printable string. 544 Return the dynamically allocated string, or NULL if an error occurs. */ 545 546 if(elem->constructed) 547 return (const char *) NULL; /* No conversion of structured elements. */ 548 549 if(!type) 550 type = elem->tag; /* Type not forced: use element tag as type. */ 551 552 switch (type) { 553 case CURL_ASN1_BOOLEAN: 554 return bool2str(elem->beg, elem->end); 555 case CURL_ASN1_INTEGER: 556 case CURL_ASN1_ENUMERATED: 557 return int2str(elem->beg, elem->end); 558 case CURL_ASN1_BIT_STRING: 559 return bit2str(elem->beg, elem->end); 560 case CURL_ASN1_OCTET_STRING: 561 return octet2str(elem->beg, elem->end); 562 case CURL_ASN1_NULL: 563 return strdup(""); 564 case CURL_ASN1_OBJECT_IDENTIFIER: 565 return OID2str(elem->beg, elem->end, TRUE); 566 case CURL_ASN1_UTC_TIME: 567 return UTime2str(elem->beg, elem->end); 568 case CURL_ASN1_GENERALIZED_TIME: 569 return GTime2str(elem->beg, elem->end); 570 case CURL_ASN1_UTF8_STRING: 571 case CURL_ASN1_NUMERIC_STRING: 572 case CURL_ASN1_PRINTABLE_STRING: 573 case CURL_ASN1_TELETEX_STRING: 574 case CURL_ASN1_IA5_STRING: 575 case CURL_ASN1_VISIBLE_STRING: 576 case CURL_ASN1_UNIVERSAL_STRING: 577 case CURL_ASN1_BMP_STRING: 578 return string2str(type, elem->beg, elem->end); 579 } 580 581 return (const char *) NULL; /* Unsupported. */ 582 } 583 584 static ssize_t encodeDN(char * buf, size_t n, curl_asn1Element * dn) 585 { 586 curl_asn1Element rdn; 587 curl_asn1Element atv; 588 curl_asn1Element oid; 589 curl_asn1Element value; 590 size_t l = 0; 591 const char * p1; 592 const char * p2; 593 const char * p3; 594 const char * str; 595 596 /* ASCII encode distinguished name at `dn' into the `n'-byte buffer at `buf'. 597 Return the total string length, even if larger than `n'. */ 598 599 for(p1 = dn->beg; p1 < dn->end;) { 600 p1 = Curl_getASN1Element(&rdn, p1, dn->end); 601 for(p2 = rdn.beg; p2 < rdn.end;) { 602 p2 = Curl_getASN1Element(&atv, p2, rdn.end); 603 p3 = Curl_getASN1Element(&oid, atv.beg, atv.end); 604 Curl_getASN1Element(&value, p3, atv.end); 605 str = Curl_ASN1tostr(&oid, 0); 606 if(!str) 607 return -1; 608 609 /* Encode delimiter. 610 If attribute has a short uppercase name, delimiter is ", ". */ 611 if(l) { 612 for(p3 = str; isupper(*p3); p3++) 613 ; 614 for(p3 = (*p3 || p3 - str > 2)? "/": ", "; *p3; p3++) { 615 if(l < n) 616 buf[l] = *p3; 617 l++; 618 } 619 } 620 621 /* Encode attribute name. */ 622 for(p3 = str; *p3; p3++) { 623 if(l < n) 624 buf[l] = *p3; 625 l++; 626 } 627 free((char *) str); 628 629 /* Generate equal sign. */ 630 if(l < n) 631 buf[l] = '='; 632 l++; 633 634 /* Generate value. */ 635 str = Curl_ASN1tostr(&value, 0); 636 if(!str) 637 return -1; 638 for(p3 = str; *p3; p3++) { 639 if(l < n) 640 buf[l] = *p3; 641 l++; 642 } 643 free((char *) str); 644 } 645 } 646 647 return l; 648 } 649 650 const char * Curl_DNtostr(curl_asn1Element * dn) 651 { 652 char * buf = (char *) NULL; 653 ssize_t n = encodeDN(buf, 0, dn); 654 655 /* Convert an ASN.1 distinguished name into a printable string. 656 Return the dynamically allocated string, or NULL if an error occurs. */ 657 658 if(n >= 0) { 659 buf = malloc(n + 1); 660 if(buf) { 661 encodeDN(buf, n + 1, dn); 662 buf[n] = '\0'; 663 } 664 } 665 return (const char *) buf; 666 } 667 668 /* 669 * X509 parser. 670 */ 671 672 void Curl_parseX509(curl_X509certificate * cert, 673 const char * beg, const char * end) 674 { 675 curl_asn1Element elem; 676 curl_asn1Element tbsCertificate; 677 const char * ccp; 678 static const char defaultVersion = 0; /* v1. */ 679 680 /* ASN.1 parse an X509 certificate into structure subfields. 681 Syntax is assumed to have already been checked by the SSL backend. 682 See RFC 5280. */ 683 684 cert->certificate.header = NULL; 685 cert->certificate.beg = beg; 686 cert->certificate.end = end; 687 688 /* Get the sequence content. */ 689 Curl_getASN1Element(&elem, beg, end); 690 beg = elem.beg; 691 end = elem.end; 692 693 /* Get tbsCertificate. */ 694 beg = Curl_getASN1Element(&tbsCertificate, beg, end); 695 /* Skip the signatureAlgorithm. */ 696 beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end); 697 /* Get the signatureValue. */ 698 Curl_getASN1Element(&cert->signature, beg, end); 699 700 /* Parse TBSCertificate. */ 701 beg = tbsCertificate.beg; 702 end = tbsCertificate.end; 703 /* Get optional version, get serialNumber. */ 704 cert->version.header = NULL; 705 cert->version.beg = &defaultVersion; 706 cert->version.end = &defaultVersion + sizeof defaultVersion;; 707 beg = Curl_getASN1Element(&elem, beg, end); 708 if(elem.tag == 0) { 709 Curl_getASN1Element(&cert->version, elem.beg, elem.end); 710 beg = Curl_getASN1Element(&elem, beg, end); 711 } 712 cert->serialNumber = elem; 713 /* Get signature algorithm. */ 714 beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end); 715 /* Get issuer. */ 716 beg = Curl_getASN1Element(&cert->issuer, beg, end); 717 /* Get notBefore and notAfter. */ 718 beg = Curl_getASN1Element(&elem, beg, end); 719 ccp = Curl_getASN1Element(&cert->notBefore, elem.beg, elem.end); 720 Curl_getASN1Element(&cert->notAfter, ccp, elem.end); 721 /* Get subject. */ 722 beg = Curl_getASN1Element(&cert->subject, beg, end); 723 /* Get subjectPublicKeyAlgorithm and subjectPublicKey. */ 724 beg = Curl_getASN1Element(&cert->subjectPublicKeyInfo, beg, end); 725 ccp = Curl_getASN1Element(&cert->subjectPublicKeyAlgorithm, 726 cert->subjectPublicKeyInfo.beg, 727 cert->subjectPublicKeyInfo.end); 728 Curl_getASN1Element(&cert->subjectPublicKey, ccp, 729 cert->subjectPublicKeyInfo.end); 730 /* Get optional issuerUiqueID, subjectUniqueID and extensions. */ 731 cert->issuerUniqueID.tag = cert->subjectUniqueID.tag = 0; 732 cert->extensions.tag = elem.tag = 0; 733 cert->issuerUniqueID.header = cert->subjectUniqueID.header = NULL; 734 cert->issuerUniqueID.beg = cert->issuerUniqueID.end = ""; 735 cert->subjectUniqueID.beg = cert->subjectUniqueID.end = ""; 736 cert->extensions.header = NULL; 737 cert->extensions.beg = cert->extensions.end = ""; 738 if(beg < end) 739 beg = Curl_getASN1Element(&elem, beg, end); 740 if(elem.tag == 1) { 741 cert->issuerUniqueID = elem; 742 if(beg < end) 743 beg = Curl_getASN1Element(&elem, beg, end); 744 } 745 if(elem.tag == 2) { 746 cert->subjectUniqueID = elem; 747 if(beg < end) 748 beg = Curl_getASN1Element(&elem, beg, end); 749 } 750 if(elem.tag == 3) 751 Curl_getASN1Element(&cert->extensions, elem.beg, elem.end); 752 } 753 754 static size_t copySubstring(char * to, const char * from) 755 { 756 size_t i; 757 758 /* Copy at most 64-characters, terminate with a newline and returns the 759 effective number of stored characters. */ 760 761 for(i = 0; i < 64; i++) { 762 to[i] = *from; 763 if(!*from++) 764 break; 765 } 766 767 to[i++] = '\n'; 768 return i; 769 } 770 771 static const char * dumpAlgo(curl_asn1Element * param, 772 const char * beg, const char * end) 773 { 774 curl_asn1Element oid; 775 776 /* Get algorithm parameters and return algorithm name. */ 777 778 beg = Curl_getASN1Element(&oid, beg, end); 779 param->header = NULL; 780 param->tag = 0; 781 param->beg = param->end = end; 782 if(beg < end) 783 Curl_getASN1Element(param, beg, end); 784 return OID2str(oid.beg, oid.end, TRUE); 785 } 786 787 static void do_pubkey_field(struct Curl_easy * data, int certnum, 788 const char * label, curl_asn1Element * elem) 789 { 790 const char * output; 791 792 /* Generate a certificate information record for the public key. */ 793 794 output = Curl_ASN1tostr(elem, 0); 795 if(output) { 796 if(data->set.ssl.certinfo) 797 Curl_ssl_push_certinfo(data, certnum, label, output); 798 if(!certnum) 799 infof(data, " %s: %s\n", label, output); 800 free((char *) output); 801 } 802 } 803 804 static void do_pubkey(struct Curl_easy * data, int certnum, 805 const char * algo, curl_asn1Element * param, 806 curl_asn1Element * pubkey) 807 { 808 curl_asn1Element elem; 809 curl_asn1Element pk; 810 const char * p; 811 const char * q; 812 unsigned long len; 813 unsigned int i; 814 815 /* Generate all information records for the public key. */ 816 817 /* Get the public key (single element). */ 818 Curl_getASN1Element(&pk, pubkey->beg + 1, pubkey->end); 819 820 if(curl_strequal(algo, "rsaEncryption")) { 821 p = Curl_getASN1Element(&elem, pk.beg, pk.end); 822 /* Compute key length. */ 823 for(q = elem.beg; !*q && q < elem.end; q++) 824 ; 825 len = (unsigned long)((elem.end - q) * 8); 826 if(len) 827 for(i = *(unsigned char *) q; !(i & 0x80); i <<= 1) 828 len--; 829 if(len > 32) 830 elem.beg = q; /* Strip leading zero bytes. */ 831 if(!certnum) 832 infof(data, " RSA Public Key (%lu bits)\n", len); 833 if(data->set.ssl.certinfo) { 834 q = curl_maprintf("%lu", len); 835 if(q) { 836 Curl_ssl_push_certinfo(data, certnum, "RSA Public Key", q); 837 free((char *) q); 838 } 839 } 840 /* Generate coefficients. */ 841 do_pubkey_field(data, certnum, "rsa(n)", &elem); 842 Curl_getASN1Element(&elem, p, pk.end); 843 do_pubkey_field(data, certnum, "rsa(e)", &elem); 844 } 845 else if(curl_strequal(algo, "dsa")) { 846 p = Curl_getASN1Element(&elem, param->beg, param->end); 847 do_pubkey_field(data, certnum, "dsa(p)", &elem); 848 p = Curl_getASN1Element(&elem, p, param->end); 849 do_pubkey_field(data, certnum, "dsa(q)", &elem); 850 Curl_getASN1Element(&elem, p, param->end); 851 do_pubkey_field(data, certnum, "dsa(g)", &elem); 852 do_pubkey_field(data, certnum, "dsa(pub_key)", &pk); 853 } 854 else if(curl_strequal(algo, "dhpublicnumber")) { 855 p = Curl_getASN1Element(&elem, param->beg, param->end); 856 do_pubkey_field(data, certnum, "dh(p)", &elem); 857 Curl_getASN1Element(&elem, param->beg, param->end); 858 do_pubkey_field(data, certnum, "dh(g)", &elem); 859 do_pubkey_field(data, certnum, "dh(pub_key)", &pk); 860 } 861 #if 0 /* Patent-encumbered. */ 862 else if(curl_strequal(algo, "ecPublicKey")) { 863 /* Left TODO. */ 864 } 865 #endif 866 } 867 868 CURLcode Curl_extract_certinfo(struct connectdata * conn, 869 int certnum, 870 const char * beg, 871 const char * end) 872 { 873 curl_X509certificate cert; 874 struct Curl_easy * data = conn->data; 875 curl_asn1Element param; 876 const char * ccp; 877 char * cp1; 878 size_t cl1; 879 char * cp2; 880 CURLcode result; 881 unsigned long version; 882 size_t i; 883 size_t j; 884 885 if(!data->set.ssl.certinfo) 886 if(certnum) 887 return CURLE_OK; 888 889 /* Prepare the certificate information for curl_easy_getinfo(). */ 890 891 /* Extract the certificate ASN.1 elements. */ 892 Curl_parseX509(&cert, beg, end); 893 894 /* Subject. */ 895 ccp = Curl_DNtostr(&cert.subject); 896 if(!ccp) 897 return CURLE_OUT_OF_MEMORY; 898 if(data->set.ssl.certinfo) 899 Curl_ssl_push_certinfo(data, certnum, "Subject", ccp); 900 if(!certnum) 901 infof(data, "%2d Subject: %s\n", certnum, ccp); 902 free((char *) ccp); 903 904 /* Issuer. */ 905 ccp = Curl_DNtostr(&cert.issuer); 906 if(!ccp) 907 return CURLE_OUT_OF_MEMORY; 908 if(data->set.ssl.certinfo) 909 Curl_ssl_push_certinfo(data, certnum, "Issuer", ccp); 910 if(!certnum) 911 infof(data, " Issuer: %s\n", ccp); 912 free((char *) ccp); 913 914 /* Version (always fits in less than 32 bits). */ 915 version = 0; 916 for(ccp = cert.version.beg; ccp < cert.version.end; ccp++) 917 version = (version << 8) | *(const unsigned char *) ccp; 918 if(data->set.ssl.certinfo) { 919 ccp = curl_maprintf("%lx", version); 920 if(!ccp) 921 return CURLE_OUT_OF_MEMORY; 922 Curl_ssl_push_certinfo(data, certnum, "Version", ccp); 923 free((char *) ccp); 924 } 925 if(!certnum) 926 infof(data, " Version: %lu (0x%lx)\n", version + 1, version); 927 928 /* Serial number. */ 929 ccp = Curl_ASN1tostr(&cert.serialNumber, 0); 930 if(!ccp) 931 return CURLE_OUT_OF_MEMORY; 932 if(data->set.ssl.certinfo) 933 Curl_ssl_push_certinfo(data, certnum, "Serial Number", ccp); 934 if(!certnum) 935 infof(data, " Serial Number: %s\n", ccp); 936 free((char *) ccp); 937 938 /* Signature algorithm .*/ 939 ccp = dumpAlgo(¶m, cert.signatureAlgorithm.beg, 940 cert.signatureAlgorithm.end); 941 if(!ccp) 942 return CURLE_OUT_OF_MEMORY; 943 if(data->set.ssl.certinfo) 944 Curl_ssl_push_certinfo(data, certnum, "Signature Algorithm", ccp); 945 if(!certnum) 946 infof(data, " Signature Algorithm: %s\n", ccp); 947 free((char *) ccp); 948 949 /* Start Date. */ 950 ccp = Curl_ASN1tostr(&cert.notBefore, 0); 951 if(!ccp) 952 return CURLE_OUT_OF_MEMORY; 953 if(data->set.ssl.certinfo) 954 Curl_ssl_push_certinfo(data, certnum, "Start Date", ccp); 955 if(!certnum) 956 infof(data, " Start Date: %s\n", ccp); 957 free((char *) ccp); 958 959 /* Expire Date. */ 960 ccp = Curl_ASN1tostr(&cert.notAfter, 0); 961 if(!ccp) 962 return CURLE_OUT_OF_MEMORY; 963 if(data->set.ssl.certinfo) 964 Curl_ssl_push_certinfo(data, certnum, "Expire Date", ccp); 965 if(!certnum) 966 infof(data, " Expire Date: %s\n", ccp); 967 free((char *) ccp); 968 969 /* Public Key Algorithm. */ 970 ccp = dumpAlgo(¶m, cert.subjectPublicKeyAlgorithm.beg, 971 cert.subjectPublicKeyAlgorithm.end); 972 if(!ccp) 973 return CURLE_OUT_OF_MEMORY; 974 if(data->set.ssl.certinfo) 975 Curl_ssl_push_certinfo(data, certnum, "Public Key Algorithm", ccp); 976 if(!certnum) 977 infof(data, " Public Key Algorithm: %s\n", ccp); 978 do_pubkey(data, certnum, ccp, ¶m, &cert.subjectPublicKey); 979 free((char *) ccp); 980 981 /* TODO: extensions. */ 982 983 /* Signature. */ 984 ccp = Curl_ASN1tostr(&cert.signature, 0); 985 if(!ccp) 986 return CURLE_OUT_OF_MEMORY; 987 if(data->set.ssl.certinfo) 988 Curl_ssl_push_certinfo(data, certnum, "Signature", ccp); 989 if(!certnum) 990 infof(data, " Signature: %s\n", ccp); 991 free((char *) ccp); 992 993 /* Generate PEM certificate. */ 994 result = Curl_base64_encode(data, cert.certificate.beg, 995 cert.certificate.end - cert.certificate.beg, 996 &cp1, &cl1); 997 if(result) 998 return result; 999 /* Compute the number of characters in final certificate string. Format is: 1000 -----BEGIN CERTIFICATE-----\n 1001 <max 64 base64 characters>\n 1002 . 1003 . 1004 . 1005 -----END CERTIFICATE-----\n 1006 */ 1007 i = 28 + cl1 + (cl1 + 64 - 1) / 64 + 26; 1008 cp2 = malloc(i + 1); 1009 if(!cp2) { 1010 free(cp1); 1011 return CURLE_OUT_OF_MEMORY; 1012 } 1013 /* Build the certificate string. */ 1014 i = copySubstring(cp2, "-----BEGIN CERTIFICATE-----"); 1015 for(j = 0; j < cl1; j += 64) 1016 i += copySubstring(cp2 + i, cp1 + j); 1017 i += copySubstring(cp2 + i, "-----END CERTIFICATE-----"); 1018 cp2[i] = '\0'; 1019 free(cp1); 1020 if(data->set.ssl.certinfo) 1021 Curl_ssl_push_certinfo(data, certnum, "Cert", cp2); 1022 if(!certnum) 1023 infof(data, "%s\n", cp2); 1024 free(cp2); 1025 return CURLE_OK; 1026 } 1027 1028 #endif /* USE_GSKIT or USE_NSS or USE_GNUTLS or USE_CYASSL or USE_SCHANNEL */ 1029 1030 #if defined(USE_GSKIT) 1031 1032 static const char * checkOID(const char * beg, const char * end, 1033 const char * oid) 1034 { 1035 curl_asn1Element e; 1036 const char * ccp; 1037 const char * p; 1038 bool matched; 1039 1040 /* Check if first ASN.1 element at `beg' is the given OID. 1041 Return a pointer in the source after the OID if found, else NULL. */ 1042 1043 ccp = Curl_getASN1Element(&e, beg, end); 1044 if(!ccp || e.tag != CURL_ASN1_OBJECT_IDENTIFIER) 1045 return (const char *) NULL; 1046 1047 p = OID2str(e.beg, e.end, FALSE); 1048 if(!p) 1049 return (const char *) NULL; 1050 1051 matched = !strcmp(p, oid); 1052 free((char *) p); 1053 return matched? ccp: (const char *) NULL; 1054 } 1055 1056 CURLcode Curl_verifyhost(struct connectdata * conn, 1057 const char * beg, const char * end) 1058 { 1059 struct Curl_easy * data = conn->data; 1060 curl_X509certificate cert; 1061 curl_asn1Element dn; 1062 curl_asn1Element elem; 1063 curl_asn1Element ext; 1064 curl_asn1Element name; 1065 const char * p; 1066 const char * q; 1067 char * dnsname; 1068 int matched = -1; 1069 size_t addrlen = (size_t) -1; 1070 ssize_t len; 1071 #ifdef ENABLE_IPV6 1072 struct in6_addr addr; 1073 #else 1074 struct in_addr addr; 1075 #endif 1076 1077 /* Verify that connection server matches info in X509 certificate at 1078 `beg'..`end'. */ 1079 1080 if(!data->set.ssl.verifyhost) 1081 return CURLE_OK; 1082 1083 if(!beg) 1084 return CURLE_PEER_FAILED_VERIFICATION; 1085 Curl_parseX509(&cert, beg, end); 1086 1087 /* Get the server IP address. */ 1088 #ifdef ENABLE_IPV6 1089 if(conn->bits.ipv6_ip && Curl_inet_pton(AF_INET6, conn->host.name, &addr)) 1090 addrlen = sizeof(struct in6_addr); 1091 else 1092 #endif 1093 if(Curl_inet_pton(AF_INET, conn->host.name, &addr)) 1094 addrlen = sizeof(struct in_addr); 1095 1096 /* Process extensions. */ 1097 for(p = cert.extensions.beg; p < cert.extensions.end && matched != 1;) { 1098 p = Curl_getASN1Element(&ext, p, cert.extensions.end); 1099 /* Check if extension is a subjectAlternativeName. */ 1100 ext.beg = checkOID(ext.beg, ext.end, sanOID); 1101 if(ext.beg) { 1102 ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end); 1103 /* Skip critical if present. */ 1104 if(elem.tag == CURL_ASN1_BOOLEAN) 1105 ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end); 1106 /* Parse the octet string contents: is a single sequence. */ 1107 Curl_getASN1Element(&elem, elem.beg, elem.end); 1108 /* Check all GeneralNames. */ 1109 for(q = elem.beg; matched != 1 && q < elem.end;) { 1110 q = Curl_getASN1Element(&name, q, elem.end); 1111 switch (name.tag) { 1112 case 2: /* DNS name. */ 1113 len = utf8asn1str(&dnsname, CURL_ASN1_IA5_STRING, 1114 name.beg, name.end); 1115 if(len > 0 && (size_t)len == strlen(dnsname)) 1116 matched = Curl_cert_hostcheck(dnsname, conn->host.name); 1117 else 1118 matched = 0; 1119 free(dnsname); 1120 break; 1121 1122 case 7: /* IP address. */ 1123 matched = (size_t) (name.end - q) == addrlen && 1124 !memcmp(&addr, q, addrlen); 1125 break; 1126 } 1127 } 1128 } 1129 } 1130 1131 switch (matched) { 1132 case 1: 1133 /* an alternative name matched the server hostname */ 1134 infof(data, "\t subjectAltName: %s matched\n", conn->host.dispname); 1135 return CURLE_OK; 1136 case 0: 1137 /* an alternative name field existed, but didn't match and then 1138 we MUST fail */ 1139 infof(data, "\t subjectAltName does not match %s\n", conn->host.dispname); 1140 return CURLE_PEER_FAILED_VERIFICATION; 1141 } 1142 1143 /* Process subject. */ 1144 name.header = NULL; 1145 name.beg = name.end = ""; 1146 q = cert.subject.beg; 1147 /* we have to look to the last occurrence of a commonName in the 1148 distinguished one to get the most significant one. */ 1149 while(q < cert.subject.end) { 1150 q = Curl_getASN1Element(&dn, q, cert.subject.end); 1151 for(p = dn.beg; p < dn.end;) { 1152 p = Curl_getASN1Element(&elem, p, dn.end); 1153 /* We have a DN's AttributeTypeAndValue: check it in case it's a CN. */ 1154 elem.beg = checkOID(elem.beg, elem.end, cnOID); 1155 if(elem.beg) 1156 name = elem; /* Latch CN. */ 1157 } 1158 } 1159 1160 /* Check the CN if found. */ 1161 if(!Curl_getASN1Element(&elem, name.beg, name.end)) 1162 failf(data, "SSL: unable to obtain common name from peer certificate"); 1163 else { 1164 len = utf8asn1str(&dnsname, elem.tag, elem.beg, elem.end); 1165 if(len < 0) { 1166 free(dnsname); 1167 return CURLE_OUT_OF_MEMORY; 1168 } 1169 if(strlen(dnsname) != (size_t) len) /* Nul byte in string ? */ 1170 failf(data, "SSL: illegal cert name field"); 1171 else if(Curl_cert_hostcheck((const char *) dnsname, conn->host.name)) { 1172 infof(data, "\t common name: %s (matched)\n", dnsname); 1173 free(dnsname); 1174 return CURLE_OK; 1175 } 1176 else 1177 failf(data, "SSL: certificate subject name '%s' does not match " 1178 "target host name '%s'", dnsname, conn->host.dispname); 1179 free(dnsname); 1180 } 1181 1182 return CURLE_PEER_FAILED_VERIFICATION; 1183 } 1184 1185 #endif /* USE_GSKIT */ 1186
