source: asp3_tinet_ecnl_arm/trunk/curl-7.57.0/lib/x509asn1.c@ 352

Last change on this file since 352 was 352, checked in by coas-nagasima, 6 years ago

arm向けASP3版ECNLを追加
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File size: 34.5 KB
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1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@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 "strcase.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/* For overflow checks. */
44#define CURL_SIZE_T_MAX ((size_t)-1)
45
46
47/* ASN.1 OIDs. */
48static const char cnOID[] = "2.5.4.3"; /* Common name. */
49static const char sanOID[] = "2.5.29.17"; /* Subject alternative name. */
50
51static const curl_OID OIDtable[] = {
52 { "1.2.840.10040.4.1", "dsa" },
53 { "1.2.840.10040.4.3", "dsa-with-sha1" },
54 { "1.2.840.10045.2.1", "ecPublicKey" },
55 { "1.2.840.10045.3.0.1", "c2pnb163v1" },
56 { "1.2.840.10045.4.1", "ecdsa-with-SHA1" },
57 { "1.2.840.10046.2.1", "dhpublicnumber" },
58 { "1.2.840.113549.1.1.1", "rsaEncryption" },
59 { "1.2.840.113549.1.1.2", "md2WithRSAEncryption" },
60 { "1.2.840.113549.1.1.4", "md5WithRSAEncryption" },
61 { "1.2.840.113549.1.1.5", "sha1WithRSAEncryption" },
62 { "1.2.840.113549.1.1.10", "RSASSA-PSS" },
63 { "1.2.840.113549.1.1.14", "sha224WithRSAEncryption" },
64 { "1.2.840.113549.1.1.11", "sha256WithRSAEncryption" },
65 { "1.2.840.113549.1.1.12", "sha384WithRSAEncryption" },
66 { "1.2.840.113549.1.1.13", "sha512WithRSAEncryption" },
67 { "1.2.840.113549.2.2", "md2" },
68 { "1.2.840.113549.2.5", "md5" },
69 { "1.3.14.3.2.26", "sha1" },
70 { cnOID, "CN" },
71 { "2.5.4.4", "SN" },
72 { "2.5.4.5", "serialNumber" },
73 { "2.5.4.6", "C" },
74 { "2.5.4.7", "L" },
75 { "2.5.4.8", "ST" },
76 { "2.5.4.9", "streetAddress" },
77 { "2.5.4.10", "O" },
78 { "2.5.4.11", "OU" },
79 { "2.5.4.12", "title" },
80 { "2.5.4.13", "description" },
81 { "2.5.4.17", "postalCode" },
82 { "2.5.4.41", "name" },
83 { "2.5.4.42", "givenName" },
84 { "2.5.4.43", "initials" },
85 { "2.5.4.44", "generationQualifier" },
86 { "2.5.4.45", "X500UniqueIdentifier" },
87 { "2.5.4.46", "dnQualifier" },
88 { "2.5.4.65", "pseudonym" },
89 { "1.2.840.113549.1.9.1", "emailAddress" },
90 { "2.5.4.72", "role" },
91 { sanOID, "subjectAltName" },
92 { "2.5.29.18", "issuerAltName" },
93 { "2.5.29.19", "basicConstraints" },
94 { "2.16.840.1.101.3.4.2.4", "sha224" },
95 { "2.16.840.1.101.3.4.2.1", "sha256" },
96 { "2.16.840.1.101.3.4.2.2", "sha384" },
97 { "2.16.840.1.101.3.4.2.3", "sha512" },
98 { (const char *) NULL, (const char *) NULL }
99};
100
101/*
102 * Lightweight ASN.1 parser.
103 * In particular, it does not check for syntactic/lexical errors.
104 * It is intended to support certificate information gathering for SSL backends
105 * that offer a mean to get certificates as a whole, but do not supply
106 * entry points to get particular certificate sub-fields.
107 * Please note there is no pretention here to rewrite a full SSL library.
108 */
109
110
111const char *Curl_getASN1Element(curl_asn1Element *elem,
112 const char *beg, const char *end)
113{
114 unsigned char b;
115 unsigned long len;
116 curl_asn1Element lelem;
117
118 /* Get a single ASN.1 element into `elem', parse ASN.1 string at `beg'
119 ending at `end'.
120 Returns a pointer in source string after the parsed element, or NULL
121 if an error occurs. */
122 if(!beg || !end || beg >= end || !*beg ||
123 (size_t)(end - beg) > CURL_ASN1_MAX)
124 return (const char *) NULL;
125
126 /* Process header byte. */
127 elem->header = beg;
128 b = (unsigned char) *beg++;
129 elem->constructed = (b & 0x20) != 0;
130 elem->class = (b >> 6) & 3;
131 b &= 0x1F;
132 if(b == 0x1F)
133 return (const char *) NULL; /* Long tag values not supported here. */
134 elem->tag = b;
135
136 /* Process length. */
137 if(beg >= end)
138 return (const char *) NULL;
139 b = (unsigned char) *beg++;
140 if(!(b & 0x80))
141 len = b;
142 else if(!(b &= 0x7F)) {
143 /* Unspecified length. Since we have all the data, we can determine the
144 effective length by skipping element until an end element is found. */
145 if(!elem->constructed)
146 return (const char *) NULL;
147 elem->beg = beg;
148 while(beg < end && *beg) {
149 beg = Curl_getASN1Element(&lelem, beg, end);
150 if(!beg)
151 return (const char *) NULL;
152 }
153 if(beg >= end)
154 return (const char *) NULL;
155 elem->end = beg;
156 return beg + 1;
157 }
158 else if((unsigned)b > (size_t)(end - beg))
159 return (const char *) NULL; /* Does not fit in source. */
160 else {
161 /* Get long length. */
162 len = 0;
163 do {
164 if(len & 0xFF000000L)
165 return (const char *) NULL; /* Lengths > 32 bits are not supported. */
166 len = (len << 8) | (unsigned char) *beg++;
167 } while(--b);
168 }
169 if(len > (size_t)(end - beg))
170 return (const char *) NULL; /* Element data does not fit in source. */
171 elem->beg = beg;
172 elem->end = beg + len;
173 return elem->end;
174}
175
176static const curl_OID * searchOID(const char *oid)
177{
178 const curl_OID *op;
179
180 /* Search the null terminated OID or OID identifier in local table.
181 Return the table entry pointer or NULL if not found. */
182
183 for(op = OIDtable; op->numoid; op++)
184 if(!strcmp(op->numoid, oid) || strcasecompare(op->textoid, oid))
185 return op;
186
187 return (const curl_OID *) NULL;
188}
189
190static const char *bool2str(const char *beg, const char *end)
191{
192 /* Convert an ASN.1 Boolean value into its string representation.
193 Return the dynamically allocated string, or NULL if source is not an
194 ASN.1 Boolean value. */
195
196 if(end - beg != 1)
197 return (const char *) NULL;
198 return strdup(*beg? "TRUE": "FALSE");
199}
200
201static const char *octet2str(const char *beg, const char *end)
202{
203 size_t n = end - beg;
204 char *buf = NULL;
205
206 /* Convert an ASN.1 octet string to a printable string.
207 Return the dynamically allocated string, or NULL if an error occurs. */
208
209 if(n <= (CURL_SIZE_T_MAX - 1) / 3) {
210 buf = malloc(3 * n + 1);
211 if(buf)
212 for(n = 0; beg < end; n += 3)
213 snprintf(buf + n, 4, "%02x:", *(const unsigned char *) beg++);
214 }
215 return buf;
216}
217
218static const char *bit2str(const char *beg, const char *end)
219{
220 /* Convert an ASN.1 bit string to a printable string.
221 Return the dynamically allocated string, or NULL if an error occurs. */
222
223 if(++beg > end)
224 return (const char *) NULL;
225 return octet2str(beg, end);
226}
227
228static const char *int2str(const char *beg, const char *end)
229{
230 long val = 0;
231 size_t n = end - beg;
232
233 /* Convert an ASN.1 integer value into its string representation.
234 Return the dynamically allocated string, or NULL if source is not an
235 ASN.1 integer value. */
236
237 if(!n)
238 return (const char *) NULL;
239
240 if(n > 4)
241 return octet2str(beg, end);
242
243 /* Represent integers <= 32-bit as a single value. */
244 if(*beg & 0x80)
245 val = ~val;
246
247 do
248 val = (val << 8) | *(const unsigned char *) beg++;
249 while(beg < end);
250 return curl_maprintf("%s%lx", (val < 0 || val >= 10)? "0x": "", val);
251}
252
253static ssize_t
254utf8asn1str(char **to, int type, const char *from, const char *end)
255{
256 size_t inlength = end - from;
257 int size = 1;
258 size_t outlength;
259 int charsize;
260 unsigned int wc;
261 char *buf;
262
263 /* Perform a lazy conversion from an ASN.1 typed string to UTF8. Allocate the
264 destination buffer dynamically. The allocation size will normally be too
265 large: this is to avoid buffer overflows.
266 Terminate the string with a nul byte and return the converted
267 string length. */
268
269 *to = (char *) NULL;
270 switch(type) {
271 case CURL_ASN1_BMP_STRING:
272 size = 2;
273 break;
274 case CURL_ASN1_UNIVERSAL_STRING:
275 size = 4;
276 break;
277 case CURL_ASN1_NUMERIC_STRING:
278 case CURL_ASN1_PRINTABLE_STRING:
279 case CURL_ASN1_TELETEX_STRING:
280 case CURL_ASN1_IA5_STRING:
281 case CURL_ASN1_VISIBLE_STRING:
282 case CURL_ASN1_UTF8_STRING:
283 break;
284 default:
285 return -1; /* Conversion not supported. */
286 }
287
288 if(inlength % size)
289 return -1; /* Length inconsistent with character size. */
290 if(inlength / size > (CURL_SIZE_T_MAX - 1) / 4)
291 return -1; /* Too big. */
292 buf = malloc(4 * (inlength / size) + 1);
293 if(!buf)
294 return -1; /* Not enough memory. */
295
296 if(type == CURL_ASN1_UTF8_STRING) {
297 /* Just copy. */
298 outlength = inlength;
299 if(outlength)
300 memcpy(buf, from, outlength);
301 }
302 else {
303 for(outlength = 0; from < end;) {
304 wc = 0;
305 switch(size) {
306 case 4:
307 wc = (wc << 8) | *(const unsigned char *) from++;
308 wc = (wc << 8) | *(const unsigned char *) from++;
309 /* fallthrough */
310 case 2:
311 wc = (wc << 8) | *(const unsigned char *) from++;
312 /* fallthrough */
313 default: /* case 1: */
314 wc = (wc << 8) | *(const unsigned char *) from++;
315 }
316 charsize = 1;
317 if(wc >= 0x00000080) {
318 if(wc >= 0x00000800) {
319 if(wc >= 0x00010000) {
320 if(wc >= 0x00200000) {
321 free(buf);
322 return -1; /* Invalid char. size for target encoding. */
323 }
324 buf[outlength + 3] = (char) (0x80 | (wc & 0x3F));
325 wc = (wc >> 6) | 0x00010000;
326 charsize++;
327 }
328 buf[outlength + 2] = (char) (0x80 | (wc & 0x3F));
329 wc = (wc >> 6) | 0x00000800;
330 charsize++;
331 }
332 buf[outlength + 1] = (char) (0x80 | (wc & 0x3F));
333 wc = (wc >> 6) | 0x000000C0;
334 charsize++;
335 }
336 buf[outlength] = (char) wc;
337 outlength += charsize;
338 }
339 }
340 buf[outlength] = '\0';
341 *to = buf;
342 return outlength;
343}
344
345static const char *string2str(int type, const char *beg, const char *end)
346{
347 char *buf;
348
349 /* Convert an ASN.1 String into its UTF-8 string representation.
350 Return the dynamically allocated string, or NULL if an error occurs. */
351
352 if(utf8asn1str(&buf, type, beg, end) < 0)
353 return (const char *) NULL;
354 return buf;
355}
356
357static int encodeUint(char *buf, int n, unsigned int x)
358{
359 int i = 0;
360 unsigned int y = x / 10;
361
362 /* Decimal ASCII encode unsigned integer `x' in the `n'-byte buffer at `buf'.
363 Return the total number of encoded digits, even if larger than `n'. */
364
365 if(y) {
366 i += encodeUint(buf, n, y);
367 x -= y * 10;
368 }
369 if(i < n)
370 buf[i] = (char) ('0' + x);
371 i++;
372 if(i < n)
373 buf[i] = '\0'; /* Store a terminator if possible. */
374 return i;
375}
376
377static int encodeOID(char *buf, int n, const char *beg, const char *end)
378{
379 int i = 0;
380 unsigned int x;
381 unsigned int y;
382
383 /* Convert an ASN.1 OID into its dotted string representation.
384 Store the result in th `n'-byte buffer at `buf'.
385 Return the converted string length, or -1 if an error occurs. */
386
387 /* Process the first two numbers. */
388 y = *(const unsigned char *) beg++;
389 x = y / 40;
390 y -= x * 40;
391 i += encodeUint(buf + i, n - i, x);
392 if(i < n)
393 buf[i] = '.';
394 i++;
395 i += encodeUint(buf + i, n - i, y);
396
397 /* Process the trailing numbers. */
398 while(beg < end) {
399 if(i < n)
400 buf[i] = '.';
401 i++;
402 x = 0;
403 do {
404 if(x & 0xFF000000)
405 return -1;
406 y = *(const unsigned char *) beg++;
407 x = (x << 7) | (y & 0x7F);
408 } while(y & 0x80);
409 i += encodeUint(buf + i, n - i, x);
410 }
411 if(i < n)
412 buf[i] = '\0';
413 return i;
414}
415
416static const char *OID2str(const char *beg, const char *end, bool symbolic)
417{
418 char *buf = (char *) NULL;
419 const curl_OID * op;
420 int n;
421
422 /* Convert an ASN.1 OID into its dotted or symbolic string representation.
423 Return the dynamically allocated string, or NULL if an error occurs. */
424
425 if(beg < end) {
426 n = encodeOID((char *) NULL, -1, beg, end);
427 if(n >= 0) {
428 buf = malloc(n + 1);
429 if(buf) {
430 encodeOID(buf, n, beg, end);
431 buf[n] = '\0';
432
433 if(symbolic) {
434 op = searchOID(buf);
435 if(op) {
436 free(buf);
437 buf = strdup(op->textoid);
438 }
439 }
440 }
441 }
442 }
443 return buf;
444}
445
446static const char *GTime2str(const char *beg, const char *end)
447{
448 const char *tzp;
449 const char *fracp;
450 char sec1, sec2;
451 size_t fracl;
452 size_t tzl;
453 const char *sep = "";
454
455 /* Convert an ASN.1 Generalized time to a printable string.
456 Return the dynamically allocated string, or NULL if an error occurs. */
457
458 for(fracp = beg; fracp < end && *fracp >= '0' && *fracp <= '9'; fracp++)
459 ;
460
461 /* Get seconds digits. */
462 sec1 = '0';
463 switch(fracp - beg - 12) {
464 case 0:
465 sec2 = '0';
466 break;
467 case 2:
468 sec1 = fracp[-2];
469 /* FALLTHROUGH */
470 case 1:
471 sec2 = fracp[-1];
472 break;
473 default:
474 return (const char *) NULL;
475 }
476
477 /* Scan for timezone, measure fractional seconds. */
478 tzp = fracp;
479 fracl = 0;
480 if(fracp < end && (*fracp == '.' || *fracp == ',')) {
481 fracp++;
482 do
483 tzp++;
484 while(tzp < end && *tzp >= '0' && *tzp <= '9');
485 /* Strip leading zeroes in fractional seconds. */
486 for(fracl = tzp - fracp - 1; fracl && fracp[fracl - 1] == '0'; fracl--)
487 ;
488 }
489
490 /* Process timezone. */
491 if(tzp >= end)
492 ; /* Nothing to do. */
493 else if(*tzp == 'Z') {
494 tzp = " GMT";
495 end = tzp + 4;
496 }
497 else {
498 sep = " ";
499 tzp++;
500 }
501
502 tzl = end - tzp;
503 return curl_maprintf("%.4s-%.2s-%.2s %.2s:%.2s:%c%c%s%.*s%s%.*s",
504 beg, beg + 4, beg + 6,
505 beg + 8, beg + 10, sec1, sec2,
506 fracl? ".": "", fracl, fracp,
507 sep, tzl, tzp);
508}
509
510static const char *UTime2str(const char *beg, const char *end)
511{
512 const char *tzp;
513 size_t tzl;
514 const char *sec;
515
516 /* Convert an ASN.1 UTC time to a printable string.
517 Return the dynamically allocated string, or NULL if an error occurs. */
518
519 for(tzp = beg; tzp < end && *tzp >= '0' && *tzp <= '9'; tzp++)
520 ;
521 /* Get the seconds. */
522 sec = beg + 10;
523 switch(tzp - sec) {
524 case 0:
525 sec = "00";
526 case 2:
527 break;
528 default:
529 return (const char *) NULL;
530 }
531
532 /* Process timezone. */
533 if(tzp >= end)
534 return (const char *) NULL;
535 if(*tzp == 'Z') {
536 tzp = "GMT";
537 end = tzp + 3;
538 }
539 else
540 tzp++;
541
542 tzl = end - tzp;
543 return curl_maprintf("%u%.2s-%.2s-%.2s %.2s:%.2s:%.2s %.*s",
544 20 - (*beg >= '5'), beg, beg + 2, beg + 4,
545 beg + 6, beg + 8, sec,
546 tzl, tzp);
547}
548
549const char *Curl_ASN1tostr(curl_asn1Element *elem, int type)
550{
551 /* Convert an ASN.1 element to a printable string.
552 Return the dynamically allocated string, or NULL if an error occurs. */
553
554 if(elem->constructed)
555 return (const char *) NULL; /* No conversion of structured elements. */
556
557 if(!type)
558 type = elem->tag; /* Type not forced: use element tag as type. */
559
560 switch(type) {
561 case CURL_ASN1_BOOLEAN:
562 return bool2str(elem->beg, elem->end);
563 case CURL_ASN1_INTEGER:
564 case CURL_ASN1_ENUMERATED:
565 return int2str(elem->beg, elem->end);
566 case CURL_ASN1_BIT_STRING:
567 return bit2str(elem->beg, elem->end);
568 case CURL_ASN1_OCTET_STRING:
569 return octet2str(elem->beg, elem->end);
570 case CURL_ASN1_NULL:
571 return strdup("");
572 case CURL_ASN1_OBJECT_IDENTIFIER:
573 return OID2str(elem->beg, elem->end, TRUE);
574 case CURL_ASN1_UTC_TIME:
575 return UTime2str(elem->beg, elem->end);
576 case CURL_ASN1_GENERALIZED_TIME:
577 return GTime2str(elem->beg, elem->end);
578 case CURL_ASN1_UTF8_STRING:
579 case CURL_ASN1_NUMERIC_STRING:
580 case CURL_ASN1_PRINTABLE_STRING:
581 case CURL_ASN1_TELETEX_STRING:
582 case CURL_ASN1_IA5_STRING:
583 case CURL_ASN1_VISIBLE_STRING:
584 case CURL_ASN1_UNIVERSAL_STRING:
585 case CURL_ASN1_BMP_STRING:
586 return string2str(type, elem->beg, elem->end);
587 }
588
589 return (const char *) NULL; /* Unsupported. */
590}
591
592static ssize_t encodeDN(char *buf, size_t n, curl_asn1Element *dn)
593{
594 curl_asn1Element rdn;
595 curl_asn1Element atv;
596 curl_asn1Element oid;
597 curl_asn1Element value;
598 size_t l = 0;
599 const char *p1;
600 const char *p2;
601 const char *p3;
602 const char *str;
603
604 /* ASCII encode distinguished name at `dn' into the `n'-byte buffer at `buf'.
605 Return the total string length, even if larger than `n'. */
606
607 for(p1 = dn->beg; p1 < dn->end;) {
608 p1 = Curl_getASN1Element(&rdn, p1, dn->end);
609 for(p2 = rdn.beg; p2 < rdn.end;) {
610 p2 = Curl_getASN1Element(&atv, p2, rdn.end);
611 p3 = Curl_getASN1Element(&oid, atv.beg, atv.end);
612 Curl_getASN1Element(&value, p3, atv.end);
613 str = Curl_ASN1tostr(&oid, 0);
614 if(!str)
615 return -1;
616
617 /* Encode delimiter.
618 If attribute has a short uppercase name, delimiter is ", ". */
619 if(l) {
620 for(p3 = str; isupper(*p3); p3++)
621 ;
622 for(p3 = (*p3 || p3 - str > 2)? "/": ", "; *p3; p3++) {
623 if(l < n)
624 buf[l] = *p3;
625 l++;
626 }
627 }
628
629 /* Encode attribute name. */
630 for(p3 = str; *p3; p3++) {
631 if(l < n)
632 buf[l] = *p3;
633 l++;
634 }
635 free((char *) str);
636
637 /* Generate equal sign. */
638 if(l < n)
639 buf[l] = '=';
640 l++;
641
642 /* Generate value. */
643 str = Curl_ASN1tostr(&value, 0);
644 if(!str)
645 return -1;
646 for(p3 = str; *p3; p3++) {
647 if(l < n)
648 buf[l] = *p3;
649 l++;
650 }
651 free((char *) str);
652 }
653 }
654
655 return l;
656}
657
658const char *Curl_DNtostr(curl_asn1Element *dn)
659{
660 char *buf = (char *) NULL;
661 ssize_t n = encodeDN(buf, 0, dn);
662
663 /* Convert an ASN.1 distinguished name into a printable string.
664 Return the dynamically allocated string, or NULL if an error occurs. */
665
666 if(n >= 0) {
667 buf = malloc(n + 1);
668 if(buf) {
669 encodeDN(buf, n + 1, dn);
670 buf[n] = '\0';
671 }
672 }
673 return (const char *) buf;
674}
675
676/*
677 * X509 parser.
678 */
679
680int Curl_parseX509(curl_X509certificate *cert,
681 const char *beg, const char *end)
682{
683 curl_asn1Element elem;
684 curl_asn1Element tbsCertificate;
685 const char *ccp;
686 static const char defaultVersion = 0; /* v1. */
687
688 /* ASN.1 parse an X509 certificate into structure subfields.
689 Syntax is assumed to have already been checked by the SSL backend.
690 See RFC 5280. */
691
692 cert->certificate.header = NULL;
693 cert->certificate.beg = beg;
694 cert->certificate.end = end;
695
696 /* Get the sequence content. */
697 if(!Curl_getASN1Element(&elem, beg, end))
698 return -1; /* Invalid bounds/size. */
699 beg = elem.beg;
700 end = elem.end;
701
702 /* Get tbsCertificate. */
703 beg = Curl_getASN1Element(&tbsCertificate, beg, end);
704 /* Skip the signatureAlgorithm. */
705 beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end);
706 /* Get the signatureValue. */
707 Curl_getASN1Element(&cert->signature, beg, end);
708
709 /* Parse TBSCertificate. */
710 beg = tbsCertificate.beg;
711 end = tbsCertificate.end;
712 /* Get optional version, get serialNumber. */
713 cert->version.header = NULL;
714 cert->version.beg = &defaultVersion;
715 cert->version.end = &defaultVersion + sizeof defaultVersion;;
716 beg = Curl_getASN1Element(&elem, beg, end);
717 if(elem.tag == 0) {
718 Curl_getASN1Element(&cert->version, elem.beg, elem.end);
719 beg = Curl_getASN1Element(&elem, beg, end);
720 }
721 cert->serialNumber = elem;
722 /* Get signature algorithm. */
723 beg = Curl_getASN1Element(&cert->signatureAlgorithm, beg, end);
724 /* Get issuer. */
725 beg = Curl_getASN1Element(&cert->issuer, beg, end);
726 /* Get notBefore and notAfter. */
727 beg = Curl_getASN1Element(&elem, beg, end);
728 ccp = Curl_getASN1Element(&cert->notBefore, elem.beg, elem.end);
729 Curl_getASN1Element(&cert->notAfter, ccp, elem.end);
730 /* Get subject. */
731 beg = Curl_getASN1Element(&cert->subject, beg, end);
732 /* Get subjectPublicKeyAlgorithm and subjectPublicKey. */
733 beg = Curl_getASN1Element(&cert->subjectPublicKeyInfo, beg, end);
734 ccp = Curl_getASN1Element(&cert->subjectPublicKeyAlgorithm,
735 cert->subjectPublicKeyInfo.beg,
736 cert->subjectPublicKeyInfo.end);
737 Curl_getASN1Element(&cert->subjectPublicKey, ccp,
738 cert->subjectPublicKeyInfo.end);
739 /* Get optional issuerUiqueID, subjectUniqueID and extensions. */
740 cert->issuerUniqueID.tag = cert->subjectUniqueID.tag = 0;
741 cert->extensions.tag = elem.tag = 0;
742 cert->issuerUniqueID.header = cert->subjectUniqueID.header = NULL;
743 cert->issuerUniqueID.beg = cert->issuerUniqueID.end = "";
744 cert->subjectUniqueID.beg = cert->subjectUniqueID.end = "";
745 cert->extensions.header = NULL;
746 cert->extensions.beg = cert->extensions.end = "";
747 if(beg < end)
748 beg = Curl_getASN1Element(&elem, beg, end);
749 if(elem.tag == 1) {
750 cert->issuerUniqueID = elem;
751 if(beg < end)
752 beg = Curl_getASN1Element(&elem, beg, end);
753 }
754 if(elem.tag == 2) {
755 cert->subjectUniqueID = elem;
756 if(beg < end)
757 beg = Curl_getASN1Element(&elem, beg, end);
758 }
759 if(elem.tag == 3)
760 Curl_getASN1Element(&cert->extensions, elem.beg, elem.end);
761 return 0;
762}
763
764static size_t copySubstring(char *to, const char *from)
765{
766 size_t i;
767
768 /* Copy at most 64-characters, terminate with a newline and returns the
769 effective number of stored characters. */
770
771 for(i = 0; i < 64; i++) {
772 to[i] = *from;
773 if(!*from++)
774 break;
775 }
776
777 to[i++] = '\n';
778 return i;
779}
780
781static const char *dumpAlgo(curl_asn1Element *param,
782 const char *beg, const char *end)
783{
784 curl_asn1Element oid;
785
786 /* Get algorithm parameters and return algorithm name. */
787
788 beg = Curl_getASN1Element(&oid, beg, end);
789 param->header = NULL;
790 param->tag = 0;
791 param->beg = param->end = end;
792 if(beg < end)
793 Curl_getASN1Element(param, beg, end);
794 return OID2str(oid.beg, oid.end, TRUE);
795}
796
797static void do_pubkey_field(struct Curl_easy *data, int certnum,
798 const char *label, curl_asn1Element *elem)
799{
800 const char *output;
801
802 /* Generate a certificate information record for the public key. */
803
804 output = Curl_ASN1tostr(elem, 0);
805 if(output) {
806 if(data->set.ssl.certinfo)
807 Curl_ssl_push_certinfo(data, certnum, label, output);
808 if(!certnum)
809 infof(data, " %s: %s\n", label, output);
810 free((char *) output);
811 }
812}
813
814static void do_pubkey(struct Curl_easy *data, int certnum,
815 const char *algo, curl_asn1Element *param,
816 curl_asn1Element *pubkey)
817{
818 curl_asn1Element elem;
819 curl_asn1Element pk;
820 const char *p;
821 const char *q;
822 unsigned long len;
823 unsigned int i;
824
825 /* Generate all information records for the public key. */
826
827 /* Get the public key (single element). */
828 Curl_getASN1Element(&pk, pubkey->beg + 1, pubkey->end);
829
830 if(strcasecompare(algo, "rsaEncryption")) {
831 p = Curl_getASN1Element(&elem, pk.beg, pk.end);
832 /* Compute key length. */
833 for(q = elem.beg; !*q && q < elem.end; q++)
834 ;
835 len = (unsigned long)((elem.end - q) * 8);
836 if(len)
837 for(i = *(unsigned char *) q; !(i & 0x80); i <<= 1)
838 len--;
839 if(len > 32)
840 elem.beg = q; /* Strip leading zero bytes. */
841 if(!certnum)
842 infof(data, " RSA Public Key (%lu bits)\n", len);
843 if(data->set.ssl.certinfo) {
844 q = curl_maprintf("%lu", len);
845 if(q) {
846 Curl_ssl_push_certinfo(data, certnum, "RSA Public Key", q);
847 free((char *) q);
848 }
849 }
850 /* Generate coefficients. */
851 do_pubkey_field(data, certnum, "rsa(n)", &elem);
852 Curl_getASN1Element(&elem, p, pk.end);
853 do_pubkey_field(data, certnum, "rsa(e)", &elem);
854 }
855 else if(strcasecompare(algo, "dsa")) {
856 p = Curl_getASN1Element(&elem, param->beg, param->end);
857 do_pubkey_field(data, certnum, "dsa(p)", &elem);
858 p = Curl_getASN1Element(&elem, p, param->end);
859 do_pubkey_field(data, certnum, "dsa(q)", &elem);
860 Curl_getASN1Element(&elem, p, param->end);
861 do_pubkey_field(data, certnum, "dsa(g)", &elem);
862 do_pubkey_field(data, certnum, "dsa(pub_key)", &pk);
863 }
864 else if(strcasecompare(algo, "dhpublicnumber")) {
865 p = Curl_getASN1Element(&elem, param->beg, param->end);
866 do_pubkey_field(data, certnum, "dh(p)", &elem);
867 Curl_getASN1Element(&elem, param->beg, param->end);
868 do_pubkey_field(data, certnum, "dh(g)", &elem);
869 do_pubkey_field(data, certnum, "dh(pub_key)", &pk);
870 }
871#if 0 /* Patent-encumbered. */
872 else if(strcasecompare(algo, "ecPublicKey")) {
873 /* Left TODO. */
874 }
875#endif
876}
877
878CURLcode Curl_extract_certinfo(struct connectdata *conn,
879 int certnum,
880 const char *beg,
881 const char *end)
882{
883 curl_X509certificate cert;
884 struct Curl_easy *data = conn->data;
885 curl_asn1Element param;
886 const char *ccp;
887 char *cp1;
888 size_t cl1;
889 char *cp2;
890 CURLcode result;
891 unsigned long version;
892 size_t i;
893 size_t j;
894
895 if(!data->set.ssl.certinfo)
896 if(certnum)
897 return CURLE_OK;
898
899 /* Prepare the certificate information for curl_easy_getinfo(). */
900
901 /* Extract the certificate ASN.1 elements. */
902 if(Curl_parseX509(&cert, beg, end))
903 return CURLE_OUT_OF_MEMORY;
904
905 /* Subject. */
906 ccp = Curl_DNtostr(&cert.subject);
907 if(!ccp)
908 return CURLE_OUT_OF_MEMORY;
909 if(data->set.ssl.certinfo)
910 Curl_ssl_push_certinfo(data, certnum, "Subject", ccp);
911 if(!certnum)
912 infof(data, "%2d Subject: %s\n", certnum, ccp);
913 free((char *) ccp);
914
915 /* Issuer. */
916 ccp = Curl_DNtostr(&cert.issuer);
917 if(!ccp)
918 return CURLE_OUT_OF_MEMORY;
919 if(data->set.ssl.certinfo)
920 Curl_ssl_push_certinfo(data, certnum, "Issuer", ccp);
921 if(!certnum)
922 infof(data, " Issuer: %s\n", ccp);
923 free((char *) ccp);
924
925 /* Version (always fits in less than 32 bits). */
926 version = 0;
927 for(ccp = cert.version.beg; ccp < cert.version.end; ccp++)
928 version = (version << 8) | *(const unsigned char *) ccp;
929 if(data->set.ssl.certinfo) {
930 ccp = curl_maprintf("%lx", version);
931 if(!ccp)
932 return CURLE_OUT_OF_MEMORY;
933 Curl_ssl_push_certinfo(data, certnum, "Version", ccp);
934 free((char *) ccp);
935 }
936 if(!certnum)
937 infof(data, " Version: %lu (0x%lx)\n", version + 1, version);
938
939 /* Serial number. */
940 ccp = Curl_ASN1tostr(&cert.serialNumber, 0);
941 if(!ccp)
942 return CURLE_OUT_OF_MEMORY;
943 if(data->set.ssl.certinfo)
944 Curl_ssl_push_certinfo(data, certnum, "Serial Number", ccp);
945 if(!certnum)
946 infof(data, " Serial Number: %s\n", ccp);
947 free((char *) ccp);
948
949 /* Signature algorithm .*/
950 ccp = dumpAlgo(&param, cert.signatureAlgorithm.beg,
951 cert.signatureAlgorithm.end);
952 if(!ccp)
953 return CURLE_OUT_OF_MEMORY;
954 if(data->set.ssl.certinfo)
955 Curl_ssl_push_certinfo(data, certnum, "Signature Algorithm", ccp);
956 if(!certnum)
957 infof(data, " Signature Algorithm: %s\n", ccp);
958 free((char *) ccp);
959
960 /* Start Date. */
961 ccp = Curl_ASN1tostr(&cert.notBefore, 0);
962 if(!ccp)
963 return CURLE_OUT_OF_MEMORY;
964 if(data->set.ssl.certinfo)
965 Curl_ssl_push_certinfo(data, certnum, "Start Date", ccp);
966 if(!certnum)
967 infof(data, " Start Date: %s\n", ccp);
968 free((char *) ccp);
969
970 /* Expire Date. */
971 ccp = Curl_ASN1tostr(&cert.notAfter, 0);
972 if(!ccp)
973 return CURLE_OUT_OF_MEMORY;
974 if(data->set.ssl.certinfo)
975 Curl_ssl_push_certinfo(data, certnum, "Expire Date", ccp);
976 if(!certnum)
977 infof(data, " Expire Date: %s\n", ccp);
978 free((char *) ccp);
979
980 /* Public Key Algorithm. */
981 ccp = dumpAlgo(&param, cert.subjectPublicKeyAlgorithm.beg,
982 cert.subjectPublicKeyAlgorithm.end);
983 if(!ccp)
984 return CURLE_OUT_OF_MEMORY;
985 if(data->set.ssl.certinfo)
986 Curl_ssl_push_certinfo(data, certnum, "Public Key Algorithm", ccp);
987 if(!certnum)
988 infof(data, " Public Key Algorithm: %s\n", ccp);
989 do_pubkey(data, certnum, ccp, &param, &cert.subjectPublicKey);
990 free((char *) ccp);
991
992/* TODO: extensions. */
993
994 /* Signature. */
995 ccp = Curl_ASN1tostr(&cert.signature, 0);
996 if(!ccp)
997 return CURLE_OUT_OF_MEMORY;
998 if(data->set.ssl.certinfo)
999 Curl_ssl_push_certinfo(data, certnum, "Signature", ccp);
1000 if(!certnum)
1001 infof(data, " Signature: %s\n", ccp);
1002 free((char *) ccp);
1003
1004 /* Generate PEM certificate. */
1005 result = Curl_base64_encode(data, cert.certificate.beg,
1006 cert.certificate.end - cert.certificate.beg,
1007 &cp1, &cl1);
1008 if(result)
1009 return result;
1010 /* Compute the number of characters in final certificate string. Format is:
1011 -----BEGIN CERTIFICATE-----\n
1012 <max 64 base64 characters>\n
1013 .
1014 .
1015 .
1016 -----END CERTIFICATE-----\n
1017 */
1018 i = 28 + cl1 + (cl1 + 64 - 1) / 64 + 26;
1019 cp2 = malloc(i + 1);
1020 if(!cp2) {
1021 free(cp1);
1022 return CURLE_OUT_OF_MEMORY;
1023 }
1024 /* Build the certificate string. */
1025 i = copySubstring(cp2, "-----BEGIN CERTIFICATE-----");
1026 for(j = 0; j < cl1; j += 64)
1027 i += copySubstring(cp2 + i, cp1 + j);
1028 i += copySubstring(cp2 + i, "-----END CERTIFICATE-----");
1029 cp2[i] = '\0';
1030 free(cp1);
1031 if(data->set.ssl.certinfo)
1032 Curl_ssl_push_certinfo(data, certnum, "Cert", cp2);
1033 if(!certnum)
1034 infof(data, "%s\n", cp2);
1035 free(cp2);
1036 return CURLE_OK;
1037}
1038
1039#endif /* USE_GSKIT or USE_NSS or USE_GNUTLS or USE_CYASSL or USE_SCHANNEL */
1040
1041#if defined(USE_GSKIT)
1042
1043static const char *checkOID(const char *beg, const char *end,
1044 const char *oid)
1045{
1046 curl_asn1Element e;
1047 const char *ccp;
1048 const char *p;
1049 bool matched;
1050
1051 /* Check if first ASN.1 element at `beg' is the given OID.
1052 Return a pointer in the source after the OID if found, else NULL. */
1053
1054 ccp = Curl_getASN1Element(&e, beg, end);
1055 if(!ccp || e.tag != CURL_ASN1_OBJECT_IDENTIFIER)
1056 return (const char *) NULL;
1057
1058 p = OID2str(e.beg, e.end, FALSE);
1059 if(!p)
1060 return (const char *) NULL;
1061
1062 matched = !strcmp(p, oid);
1063 free((char *) p);
1064 return matched? ccp: (const char *) NULL;
1065}
1066
1067CURLcode Curl_verifyhost(struct connectdata *conn,
1068 const char *beg, const char *end)
1069{
1070 struct Curl_easy *data = conn->data;
1071 curl_X509certificate cert;
1072 curl_asn1Element dn;
1073 curl_asn1Element elem;
1074 curl_asn1Element ext;
1075 curl_asn1Element name;
1076 const char *p;
1077 const char *q;
1078 char *dnsname;
1079 int matched = -1;
1080 size_t addrlen = (size_t) -1;
1081 ssize_t len;
1082 const char * const hostname = SSL_IS_PROXY()? conn->http_proxy.host.name:
1083 conn->host.name;
1084 const char * const dispname = SSL_IS_PROXY()?
1085 conn->http_proxy.host.dispname:
1086 conn->host.dispname;
1087#ifdef ENABLE_IPV6
1088 struct in6_addr addr;
1089#else
1090 struct in_addr addr;
1091#endif
1092
1093 /* Verify that connection server matches info in X509 certificate at
1094 `beg'..`end'. */
1095
1096 if(!SSL_CONN_CONFIG(verifyhost))
1097 return CURLE_OK;
1098
1099 if(Curl_parseX509(&cert, beg, end))
1100 return CURLE_PEER_FAILED_VERIFICATION;
1101
1102 /* Get the server IP address. */
1103#ifdef ENABLE_IPV6
1104 if(conn->bits.ipv6_ip && Curl_inet_pton(AF_INET6, hostname, &addr))
1105 addrlen = sizeof(struct in6_addr);
1106 else
1107#endif
1108 if(Curl_inet_pton(AF_INET, hostname, &addr))
1109 addrlen = sizeof(struct in_addr);
1110
1111 /* Process extensions. */
1112 for(p = cert.extensions.beg; p < cert.extensions.end && matched != 1;) {
1113 p = Curl_getASN1Element(&ext, p, cert.extensions.end);
1114 /* Check if extension is a subjectAlternativeName. */
1115 ext.beg = checkOID(ext.beg, ext.end, sanOID);
1116 if(ext.beg) {
1117 ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end);
1118 /* Skip critical if present. */
1119 if(elem.tag == CURL_ASN1_BOOLEAN)
1120 ext.beg = Curl_getASN1Element(&elem, ext.beg, ext.end);
1121 /* Parse the octet string contents: is a single sequence. */
1122 Curl_getASN1Element(&elem, elem.beg, elem.end);
1123 /* Check all GeneralNames. */
1124 for(q = elem.beg; matched != 1 && q < elem.end;) {
1125 q = Curl_getASN1Element(&name, q, elem.end);
1126 switch(name.tag) {
1127 case 2: /* DNS name. */
1128 len = utf8asn1str(&dnsname, CURL_ASN1_IA5_STRING,
1129 name.beg, name.end);
1130 if(len > 0 && (size_t)len == strlen(dnsname))
1131 matched = Curl_cert_hostcheck(dnsname, hostname);
1132 else
1133 matched = 0;
1134 free(dnsname);
1135 break;
1136
1137 case 7: /* IP address. */
1138 matched = (size_t) (name.end - q) == addrlen &&
1139 !memcmp(&addr, q, addrlen);
1140 break;
1141 }
1142 }
1143 }
1144 }
1145
1146 switch(matched) {
1147 case 1:
1148 /* an alternative name matched the server hostname */
1149 infof(data, "\t subjectAltName: %s matched\n", dispname);
1150 return CURLE_OK;
1151 case 0:
1152 /* an alternative name field existed, but didn't match and then
1153 we MUST fail */
1154 infof(data, "\t subjectAltName does not match %s\n", dispname);
1155 return CURLE_PEER_FAILED_VERIFICATION;
1156 }
1157
1158 /* Process subject. */
1159 name.header = NULL;
1160 name.beg = name.end = "";
1161 q = cert.subject.beg;
1162 /* we have to look to the last occurrence of a commonName in the
1163 distinguished one to get the most significant one. */
1164 while(q < cert.subject.end) {
1165 q = Curl_getASN1Element(&dn, q, cert.subject.end);
1166 for(p = dn.beg; p < dn.end;) {
1167 p = Curl_getASN1Element(&elem, p, dn.end);
1168 /* We have a DN's AttributeTypeAndValue: check it in case it's a CN. */
1169 elem.beg = checkOID(elem.beg, elem.end, cnOID);
1170 if(elem.beg)
1171 name = elem; /* Latch CN. */
1172 }
1173 }
1174
1175 /* Check the CN if found. */
1176 if(!Curl_getASN1Element(&elem, name.beg, name.end))
1177 failf(data, "SSL: unable to obtain common name from peer certificate");
1178 else {
1179 len = utf8asn1str(&dnsname, elem.tag, elem.beg, elem.end);
1180 if(len < 0) {
1181 free(dnsname);
1182 return CURLE_OUT_OF_MEMORY;
1183 }
1184 if(strlen(dnsname) != (size_t) len) /* Nul byte in string ? */
1185 failf(data, "SSL: illegal cert name field");
1186 else if(Curl_cert_hostcheck((const char *) dnsname, hostname)) {
1187 infof(data, "\t common name: %s (matched)\n", dnsname);
1188 free(dnsname);
1189 return CURLE_OK;
1190 }
1191 else
1192 failf(data, "SSL: certificate subject name '%s' does not match "
1193 "target host name '%s'", dnsname, dispname);
1194 free(dnsname);
1195 }
1196
1197 return CURLE_PEER_FAILED_VERIFICATION;
1198}
1199
1200#endif /* USE_GSKIT */
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