1 /*
2 * Hotspot 2.0 OSU client - EST client
3 * Copyright (c) 2012-2014, Qualcomm Atheros, Inc.
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10 #include <openssl/err.h>
11 #include <openssl/evp.h>
12 #include <openssl/pem.h>
13 #include <openssl/pkcs7.h>
14 #include <openssl/rsa.h>
15 #include <openssl/asn1.h>
16 #include <openssl/asn1t.h>
17 #include <openssl/x509.h>
18 #include <openssl/x509v3.h>
19 #include <openssl/opensslv.h>
20 #ifdef OPENSSL_IS_BORINGSSL
21 #include <openssl/buf.h>
22 #endif /* OPENSSL_IS_BORINGSSL */
23
24 #include "common.h"
25 #include "utils/base64.h"
26 #include "utils/xml-utils.h"
27 #include "utils/http-utils.h"
28 #include "osu_client.h"
29
30
pkcs7_to_cert(struct hs20_osu_client * ctx,const u8 * pkcs7,size_t len,char * pem_file,char * der_file)31 static int pkcs7_to_cert(struct hs20_osu_client *ctx, const u8 *pkcs7,
32 size_t len, char *pem_file, char *der_file)
33 {
34 #ifdef OPENSSL_IS_BORINGSSL
35 CBS pkcs7_cbs;
36 #else /* OPENSSL_IS_BORINGSSL */
37 PKCS7 *p7 = NULL;
38 const unsigned char *p = pkcs7;
39 #endif /* OPENSSL_IS_BORINGSSL */
40 STACK_OF(X509) *certs;
41 int i, num, ret = -1;
42 BIO *out = NULL;
43
44 #ifdef OPENSSL_IS_BORINGSSL
45 certs = sk_X509_new_null();
46 if (!certs)
47 goto fail;
48 CBS_init(&pkcs7_cbs, pkcs7, len);
49 if (!PKCS7_get_certificates(certs, &pkcs7_cbs)) {
50 wpa_printf(MSG_INFO, "Could not parse PKCS#7 object: %s",
51 ERR_error_string(ERR_get_error(), NULL));
52 write_result(ctx, "Could not parse PKCS#7 object from EST");
53 goto fail;
54 }
55 #else /* OPENSSL_IS_BORINGSSL */
56 p7 = d2i_PKCS7(NULL, &p, len);
57 if (p7 == NULL) {
58 wpa_printf(MSG_INFO, "Could not parse PKCS#7 object: %s",
59 ERR_error_string(ERR_get_error(), NULL));
60 write_result(ctx, "Could not parse PKCS#7 object from EST");
61 goto fail;
62 }
63
64 switch (OBJ_obj2nid(p7->type)) {
65 case NID_pkcs7_signed:
66 certs = p7->d.sign->cert;
67 break;
68 case NID_pkcs7_signedAndEnveloped:
69 certs = p7->d.signed_and_enveloped->cert;
70 break;
71 default:
72 certs = NULL;
73 break;
74 }
75 #endif /* OPENSSL_IS_BORINGSSL */
76
77 if (!certs || ((num = sk_X509_num(certs)) == 0)) {
78 wpa_printf(MSG_INFO, "No certificates found in PKCS#7 object");
79 write_result(ctx, "No certificates found in PKCS#7 object");
80 goto fail;
81 }
82
83 if (der_file) {
84 FILE *f = fopen(der_file, "wb");
85 if (f == NULL)
86 goto fail;
87 i2d_X509_fp(f, sk_X509_value(certs, 0));
88 fclose(f);
89 }
90
91 if (pem_file) {
92 out = BIO_new(BIO_s_file());
93 if (out == NULL ||
94 BIO_write_filename(out, pem_file) <= 0)
95 goto fail;
96
97 for (i = 0; i < num; i++) {
98 X509 *cert = sk_X509_value(certs, i);
99 X509_print(out, cert);
100 PEM_write_bio_X509(out, cert);
101 BIO_puts(out, "\n");
102 }
103 }
104
105 ret = 0;
106
107 fail:
108 #ifdef OPENSSL_IS_BORINGSSL
109 if (certs)
110 sk_X509_pop_free(certs, X509_free);
111 #else /* OPENSSL_IS_BORINGSSL */
112 PKCS7_free(p7);
113 #endif /* OPENSSL_IS_BORINGSSL */
114 if (out)
115 BIO_free_all(out);
116
117 return ret;
118 }
119
120
est_load_cacerts(struct hs20_osu_client * ctx,const char * url)121 int est_load_cacerts(struct hs20_osu_client *ctx, const char *url)
122 {
123 char *buf, *resp;
124 size_t buflen;
125 unsigned char *pkcs7;
126 size_t pkcs7_len, resp_len;
127 int res;
128
129 buflen = os_strlen(url) + 100;
130 buf = os_malloc(buflen);
131 if (buf == NULL)
132 return -1;
133
134 os_snprintf(buf, buflen, "%s/cacerts", url);
135 wpa_printf(MSG_INFO, "Download EST cacerts from %s", buf);
136 write_summary(ctx, "Download EST cacerts from %s", buf);
137 ctx->no_osu_cert_validation = 1;
138 http_ocsp_set(ctx->http, 1);
139 res = http_download_file(ctx->http, buf, "Cert/est-cacerts.txt",
140 ctx->ca_fname);
141 http_ocsp_set(ctx->http,
142 (ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
143 ctx->no_osu_cert_validation = 0;
144 if (res < 0) {
145 wpa_printf(MSG_INFO, "Failed to download EST cacerts from %s",
146 buf);
147 write_result(ctx, "Failed to download EST cacerts from %s",
148 buf);
149 os_free(buf);
150 return -1;
151 }
152 os_free(buf);
153
154 resp = os_readfile("Cert/est-cacerts.txt", &resp_len);
155 if (resp == NULL) {
156 wpa_printf(MSG_INFO, "Could not read Cert/est-cacerts.txt");
157 write_result(ctx, "Could not read EST cacerts");
158 return -1;
159 }
160
161 pkcs7 = base64_decode(resp, resp_len, &pkcs7_len);
162 if (pkcs7 && pkcs7_len < resp_len / 2) {
163 wpa_printf(MSG_INFO, "Too short base64 decode (%u bytes; downloaded %u bytes) - assume this was binary",
164 (unsigned int) pkcs7_len, (unsigned int) resp_len);
165 os_free(pkcs7);
166 pkcs7 = NULL;
167 }
168 if (pkcs7 == NULL) {
169 wpa_printf(MSG_INFO, "EST workaround - Could not decode base64, assume this is DER encoded PKCS7");
170 pkcs7 = os_malloc(resp_len);
171 if (pkcs7) {
172 os_memcpy(pkcs7, resp, resp_len);
173 pkcs7_len = resp_len;
174 }
175 }
176 os_free(resp);
177
178 if (pkcs7 == NULL) {
179 wpa_printf(MSG_INFO, "Could not fetch PKCS7 cacerts");
180 write_result(ctx, "Could not fetch EST PKCS#7 cacerts");
181 return -1;
182 }
183
184 res = pkcs7_to_cert(ctx, pkcs7, pkcs7_len, "Cert/est-cacerts.pem",
185 NULL);
186 os_free(pkcs7);
187 if (res < 0) {
188 wpa_printf(MSG_INFO, "Could not parse CA certs from PKCS#7 cacerts response");
189 write_result(ctx, "Could not parse CA certs from EST PKCS#7 cacerts response");
190 return -1;
191 }
192 unlink("Cert/est-cacerts.txt");
193
194 return 0;
195 }
196
197
198 /*
199 * CsrAttrs ::= SEQUENCE SIZE (0..MAX) OF AttrOrOID
200 *
201 * AttrOrOID ::= CHOICE {
202 * oid OBJECT IDENTIFIER,
203 * attribute Attribute }
204 *
205 * Attribute ::= SEQUENCE {
206 * type OBJECT IDENTIFIER,
207 * values SET SIZE(1..MAX) OF OBJECT IDENTIFIER }
208 */
209
210 typedef struct {
211 ASN1_OBJECT *type;
212 STACK_OF(ASN1_OBJECT) *values;
213 } Attribute;
214
215 typedef struct {
216 int type;
217 union {
218 ASN1_OBJECT *oid;
219 Attribute *attribute;
220 } d;
221 } AttrOrOID;
222
223 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(OPENSSL_IS_BORINGSSL)
224 DEFINE_STACK_OF(AttrOrOID)
225 #endif
226
227 typedef struct {
228 int type;
229 STACK_OF(AttrOrOID) *attrs;
230 } CsrAttrs;
231
232 ASN1_SEQUENCE(Attribute) = {
233 ASN1_SIMPLE(Attribute, type, ASN1_OBJECT),
234 ASN1_SET_OF(Attribute, values, ASN1_OBJECT)
235 } ASN1_SEQUENCE_END(Attribute);
236
237 ASN1_CHOICE(AttrOrOID) = {
238 ASN1_SIMPLE(AttrOrOID, d.oid, ASN1_OBJECT),
239 ASN1_SIMPLE(AttrOrOID, d.attribute, Attribute)
240 } ASN1_CHOICE_END(AttrOrOID);
241
242 ASN1_CHOICE(CsrAttrs) = {
243 ASN1_SEQUENCE_OF(CsrAttrs, attrs, AttrOrOID)
244 } ASN1_CHOICE_END(CsrAttrs);
245
246 IMPLEMENT_ASN1_FUNCTIONS(CsrAttrs);
247
248
add_csrattrs_oid(struct hs20_osu_client * ctx,ASN1_OBJECT * oid,STACK_OF (X509_EXTENSION)* exts)249 static void add_csrattrs_oid(struct hs20_osu_client *ctx, ASN1_OBJECT *oid,
250 STACK_OF(X509_EXTENSION) *exts)
251 {
252 char txt[100];
253 int res;
254
255 if (!oid)
256 return;
257
258 res = OBJ_obj2txt(txt, sizeof(txt), oid, 1);
259 if (res < 0 || res >= (int) sizeof(txt))
260 return;
261
262 if (os_strcmp(txt, "1.2.840.113549.1.9.7") == 0) {
263 wpa_printf(MSG_INFO, "TODO: csrattr challengePassword");
264 } else if (os_strcmp(txt, "1.2.840.113549.1.1.11") == 0) {
265 wpa_printf(MSG_INFO, "csrattr sha256WithRSAEncryption");
266 } else {
267 wpa_printf(MSG_INFO, "Ignore unsupported csrattr oid %s", txt);
268 }
269 }
270
271
add_csrattrs_ext_req(struct hs20_osu_client * ctx,STACK_OF (ASN1_OBJECT)* values,STACK_OF (X509_EXTENSION)* exts)272 static void add_csrattrs_ext_req(struct hs20_osu_client *ctx,
273 STACK_OF(ASN1_OBJECT) *values,
274 STACK_OF(X509_EXTENSION) *exts)
275 {
276 char txt[100];
277 int i, num, res;
278
279 num = sk_ASN1_OBJECT_num(values);
280 for (i = 0; i < num; i++) {
281 ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(values, i);
282
283 res = OBJ_obj2txt(txt, sizeof(txt), oid, 1);
284 if (res < 0 || res >= (int) sizeof(txt))
285 continue;
286
287 if (os_strcmp(txt, "1.3.6.1.1.1.1.22") == 0) {
288 wpa_printf(MSG_INFO, "TODO: extReq macAddress");
289 } else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.3") == 0) {
290 wpa_printf(MSG_INFO, "TODO: extReq imei");
291 } else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.4") == 0) {
292 wpa_printf(MSG_INFO, "TODO: extReq meid");
293 } else if (os_strcmp(txt, "1.3.6.1.4.1.40808.1.1.5") == 0) {
294 wpa_printf(MSG_INFO, "TODO: extReq DevId");
295 } else {
296 wpa_printf(MSG_INFO, "Ignore unsupported cstattr extensionsRequest %s",
297 txt);
298 }
299 }
300 }
301
302
add_csrattrs_attr(struct hs20_osu_client * ctx,Attribute * attr,STACK_OF (X509_EXTENSION)* exts)303 static void add_csrattrs_attr(struct hs20_osu_client *ctx, Attribute *attr,
304 STACK_OF(X509_EXTENSION) *exts)
305 {
306 char txt[100], txt2[100];
307 int i, num, res;
308
309 if (!attr || !attr->type || !attr->values)
310 return;
311
312 res = OBJ_obj2txt(txt, sizeof(txt), attr->type, 1);
313 if (res < 0 || res >= (int) sizeof(txt))
314 return;
315
316 if (os_strcmp(txt, "1.2.840.113549.1.9.14") == 0) {
317 add_csrattrs_ext_req(ctx, attr->values, exts);
318 return;
319 }
320
321 num = sk_ASN1_OBJECT_num(attr->values);
322 for (i = 0; i < num; i++) {
323 ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(attr->values, i);
324
325 res = OBJ_obj2txt(txt2, sizeof(txt2), oid, 1);
326 if (res < 0 || res >= (int) sizeof(txt2))
327 continue;
328
329 wpa_printf(MSG_INFO, "Ignore unsupported cstattr::attr %s oid %s",
330 txt, txt2);
331 }
332 }
333
334
add_csrattrs(struct hs20_osu_client * ctx,CsrAttrs * csrattrs,STACK_OF (X509_EXTENSION)* exts)335 static void add_csrattrs(struct hs20_osu_client *ctx, CsrAttrs *csrattrs,
336 STACK_OF(X509_EXTENSION) *exts)
337 {
338 int i, num;
339
340 if (!csrattrs || ! csrattrs->attrs)
341 return;
342
343 #ifdef OPENSSL_IS_BORINGSSL
344 num = sk_num(CHECKED_CAST(_STACK *, STACK_OF(AttrOrOID) *,
345 csrattrs->attrs));
346 for (i = 0; i < num; i++) {
347 AttrOrOID *ao = sk_value(
348 CHECKED_CAST(_STACK *, const STACK_OF(AttrOrOID) *,
349 csrattrs->attrs), i);
350 switch (ao->type) {
351 case 0:
352 add_csrattrs_oid(ctx, ao->d.oid, exts);
353 break;
354 case 1:
355 add_csrattrs_attr(ctx, ao->d.attribute, exts);
356 break;
357 }
358 }
359 #else /* OPENSSL_IS_BORINGSSL */
360 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(OPENSSL_IS_BORINGSSL)
361 num = sk_AttrOrOID_num(csrattrs->attrs);
362 #else
363 num = SKM_sk_num(AttrOrOID, csrattrs->attrs);
364 #endif
365 for (i = 0; i < num; i++) {
366 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(OPENSSL_IS_BORINGSSL)
367 AttrOrOID *ao = sk_AttrOrOID_value(csrattrs->attrs, i);
368 #else
369 AttrOrOID *ao = SKM_sk_value(AttrOrOID, csrattrs->attrs, i);
370 #endif
371 switch (ao->type) {
372 case 0:
373 add_csrattrs_oid(ctx, ao->d.oid, exts);
374 break;
375 case 1:
376 add_csrattrs_attr(ctx, ao->d.attribute, exts);
377 break;
378 }
379 }
380 #endif /* OPENSSL_IS_BORINGSSL */
381 }
382
383
generate_csr(struct hs20_osu_client * ctx,char * key_pem,char * csr_pem,char * est_req,char * old_cert,CsrAttrs * csrattrs)384 static int generate_csr(struct hs20_osu_client *ctx, char *key_pem,
385 char *csr_pem, char *est_req, char *old_cert,
386 CsrAttrs *csrattrs)
387 {
388 EVP_PKEY_CTX *pctx = NULL;
389 EVP_PKEY *pkey = NULL;
390 RSA *rsa;
391 X509_REQ *req = NULL;
392 int ret = -1;
393 unsigned int val;
394 X509_NAME *subj = NULL;
395 char name[100];
396 STACK_OF(X509_EXTENSION) *exts = NULL;
397 X509_EXTENSION *ex;
398 BIO *out;
399 CONF *ctmp = NULL;
400
401 wpa_printf(MSG_INFO, "Generate RSA private key");
402 write_summary(ctx, "Generate RSA private key");
403 pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
404 if (!pctx)
405 return -1;
406
407 if (EVP_PKEY_keygen_init(pctx) <= 0)
408 goto fail;
409
410 if (EVP_PKEY_CTX_set_rsa_keygen_bits(pctx, 2048) <= 0)
411 goto fail;
412
413 if (EVP_PKEY_keygen(pctx, &pkey) <= 0)
414 goto fail;
415 EVP_PKEY_CTX_free(pctx);
416 pctx = NULL;
417
418 rsa = EVP_PKEY_get1_RSA(pkey);
419 if (rsa == NULL)
420 goto fail;
421
422 if (key_pem) {
423 FILE *f = fopen(key_pem, "wb");
424 if (f == NULL)
425 goto fail;
426 if (!PEM_write_RSAPrivateKey(f, rsa, NULL, NULL, 0, NULL,
427 NULL)) {
428 wpa_printf(MSG_INFO, "Could not write private key: %s",
429 ERR_error_string(ERR_get_error(), NULL));
430 fclose(f);
431 goto fail;
432 }
433 fclose(f);
434 }
435
436 wpa_printf(MSG_INFO, "Generate CSR");
437 write_summary(ctx, "Generate CSR");
438 req = X509_REQ_new();
439 if (req == NULL)
440 goto fail;
441
442 if (old_cert) {
443 FILE *f;
444 X509 *cert;
445 int res;
446
447 f = fopen(old_cert, "r");
448 if (f == NULL)
449 goto fail;
450 cert = PEM_read_X509(f, NULL, NULL, NULL);
451 fclose(f);
452
453 if (cert == NULL)
454 goto fail;
455 res = X509_REQ_set_subject_name(req,
456 X509_get_subject_name(cert));
457 X509_free(cert);
458 if (!res)
459 goto fail;
460 } else {
461 os_get_random((u8 *) &val, sizeof(val));
462 os_snprintf(name, sizeof(name), "cert-user-%u", val);
463 subj = X509_NAME_new();
464 if (subj == NULL ||
465 !X509_NAME_add_entry_by_txt(subj, "CN", MBSTRING_ASC,
466 (unsigned char *) name,
467 -1, -1, 0) ||
468 !X509_REQ_set_subject_name(req, subj))
469 goto fail;
470 X509_NAME_free(subj);
471 subj = NULL;
472 }
473
474 if (!X509_REQ_set_pubkey(req, pkey))
475 goto fail;
476
477 exts = sk_X509_EXTENSION_new_null();
478 if (!exts)
479 goto fail;
480
481 ex = X509V3_EXT_nconf_nid(ctmp, NULL, NID_basic_constraints,
482 "CA:FALSE");
483 if (ex == NULL ||
484 !sk_X509_EXTENSION_push(exts, ex))
485 goto fail;
486
487 ex = X509V3_EXT_nconf_nid(ctmp, NULL, NID_key_usage,
488 "nonRepudiation,digitalSignature,keyEncipherment");
489 if (ex == NULL ||
490 !sk_X509_EXTENSION_push(exts, ex))
491 goto fail;
492
493 ex = X509V3_EXT_nconf_nid(ctmp, NULL, NID_ext_key_usage,
494 "1.3.6.1.4.1.40808.1.1.2");
495 if (ex == NULL ||
496 !sk_X509_EXTENSION_push(exts, ex))
497 goto fail;
498
499 add_csrattrs(ctx, csrattrs, exts);
500
501 if (!X509_REQ_add_extensions(req, exts))
502 goto fail;
503 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
504 exts = NULL;
505
506 if (!X509_REQ_sign(req, pkey, EVP_sha256()))
507 goto fail;
508
509 out = BIO_new(BIO_s_mem());
510 if (out) {
511 char *txt;
512 size_t rlen;
513
514 #if !defined(ANDROID) || !defined(OPENSSL_IS_BORINGSSL)
515 X509_REQ_print(out, req);
516 #endif
517 rlen = BIO_ctrl_pending(out);
518 txt = os_malloc(rlen + 1);
519 if (txt) {
520 int res = BIO_read(out, txt, rlen);
521 if (res > 0) {
522 txt[res] = '\0';
523 wpa_printf(MSG_MSGDUMP, "OpenSSL: Certificate request:\n%s",
524 txt);
525 }
526 os_free(txt);
527 }
528 BIO_free(out);
529 }
530
531 if (csr_pem) {
532 FILE *f = fopen(csr_pem, "w");
533 if (f == NULL)
534 goto fail;
535 #if !defined(ANDROID) || !defined(OPENSSL_IS_BORINGSSL)
536 X509_REQ_print_fp(f, req);
537 #endif
538 if (!PEM_write_X509_REQ(f, req)) {
539 fclose(f);
540 goto fail;
541 }
542 fclose(f);
543 }
544
545 if (est_req) {
546 BIO *mem = BIO_new(BIO_s_mem());
547 BUF_MEM *ptr;
548 char *pos, *end, *buf_end;
549 FILE *f;
550
551 if (mem == NULL)
552 goto fail;
553 if (!PEM_write_bio_X509_REQ(mem, req)) {
554 BIO_free(mem);
555 goto fail;
556 }
557
558 BIO_get_mem_ptr(mem, &ptr);
559 pos = ptr->data;
560 buf_end = pos + ptr->length;
561
562 /* Remove START/END lines */
563 while (pos < buf_end && *pos != '\n')
564 pos++;
565 if (pos == buf_end) {
566 BIO_free(mem);
567 goto fail;
568 }
569 pos++;
570
571 end = pos;
572 while (end < buf_end && *end != '-')
573 end++;
574
575 f = fopen(est_req, "w");
576 if (f == NULL) {
577 BIO_free(mem);
578 goto fail;
579 }
580 fwrite(pos, end - pos, 1, f);
581 fclose(f);
582
583 BIO_free(mem);
584 }
585
586 ret = 0;
587 fail:
588 if (exts)
589 sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
590 if (subj)
591 X509_NAME_free(subj);
592 if (req)
593 X509_REQ_free(req);
594 if (pkey)
595 EVP_PKEY_free(pkey);
596 if (pctx)
597 EVP_PKEY_CTX_free(pctx);
598 return ret;
599 }
600
601
est_build_csr(struct hs20_osu_client * ctx,const char * url)602 int est_build_csr(struct hs20_osu_client *ctx, const char *url)
603 {
604 char *buf;
605 size_t buflen;
606 int res;
607 char old_cert_buf[200];
608 char *old_cert = NULL;
609 CsrAttrs *csrattrs = NULL;
610
611 buflen = os_strlen(url) + 100;
612 buf = os_malloc(buflen);
613 if (buf == NULL)
614 return -1;
615
616 os_snprintf(buf, buflen, "%s/csrattrs", url);
617 wpa_printf(MSG_INFO, "Download csrattrs from %s", buf);
618 write_summary(ctx, "Download EST csrattrs from %s", buf);
619 ctx->no_osu_cert_validation = 1;
620 http_ocsp_set(ctx->http, 1);
621 res = http_download_file(ctx->http, buf, "Cert/est-csrattrs.txt",
622 ctx->ca_fname);
623 http_ocsp_set(ctx->http,
624 (ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
625 ctx->no_osu_cert_validation = 0;
626 os_free(buf);
627 if (res < 0) {
628 wpa_printf(MSG_INFO, "Failed to download EST csrattrs - assume no extra attributes are needed");
629 } else {
630 size_t resp_len;
631 char *resp;
632 unsigned char *attrs;
633 const unsigned char *pos;
634 size_t attrs_len;
635
636 resp = os_readfile("Cert/est-csrattrs.txt", &resp_len);
637 if (resp == NULL) {
638 wpa_printf(MSG_INFO, "Could not read csrattrs");
639 return -1;
640 }
641
642 attrs = base64_decode(resp, resp_len, &attrs_len);
643 os_free(resp);
644
645 if (attrs == NULL) {
646 wpa_printf(MSG_INFO, "Could not base64 decode csrattrs");
647 return -1;
648 }
649 unlink("Cert/est-csrattrs.txt");
650
651 pos = attrs;
652 csrattrs = d2i_CsrAttrs(NULL, &pos, attrs_len);
653 os_free(attrs);
654 if (csrattrs == NULL) {
655 wpa_printf(MSG_INFO, "Failed to parse csrattrs ASN.1");
656 /* Continue assuming no additional requirements */
657 }
658 }
659
660 if (ctx->client_cert_present) {
661 os_snprintf(old_cert_buf, sizeof(old_cert_buf),
662 "SP/%s/client-cert.pem", ctx->fqdn);
663 old_cert = old_cert_buf;
664 }
665
666 res = generate_csr(ctx, "Cert/privkey-plain.pem", "Cert/est-req.pem",
667 "Cert/est-req.b64", old_cert, csrattrs);
668 if (csrattrs)
669 CsrAttrs_free(csrattrs);
670
671 return res;
672 }
673
674
est_simple_enroll(struct hs20_osu_client * ctx,const char * url,const char * user,const char * pw)675 int est_simple_enroll(struct hs20_osu_client *ctx, const char *url,
676 const char *user, const char *pw)
677 {
678 char *buf, *resp, *req, *req2;
679 size_t buflen, resp_len, len, pkcs7_len;
680 unsigned char *pkcs7;
681 char client_cert_buf[200];
682 char client_key_buf[200];
683 const char *client_cert = NULL, *client_key = NULL;
684 int res;
685
686 req = os_readfile("Cert/est-req.b64", &len);
687 if (req == NULL) {
688 wpa_printf(MSG_INFO, "Could not read Cert/req.b64");
689 return -1;
690 }
691 req2 = os_realloc(req, len + 1);
692 if (req2 == NULL) {
693 os_free(req);
694 return -1;
695 }
696 req2[len] = '\0';
697 req = req2;
698 wpa_printf(MSG_DEBUG, "EST simpleenroll request: %s", req);
699
700 buflen = os_strlen(url) + 100;
701 buf = os_malloc(buflen);
702 if (buf == NULL) {
703 os_free(req);
704 return -1;
705 }
706
707 if (ctx->client_cert_present) {
708 os_snprintf(buf, buflen, "%s/simplereenroll", url);
709 os_snprintf(client_cert_buf, sizeof(client_cert_buf),
710 "SP/%s/client-cert.pem", ctx->fqdn);
711 client_cert = client_cert_buf;
712 os_snprintf(client_key_buf, sizeof(client_key_buf),
713 "SP/%s/client-key.pem", ctx->fqdn);
714 client_key = client_key_buf;
715 } else
716 os_snprintf(buf, buflen, "%s/simpleenroll", url);
717 wpa_printf(MSG_INFO, "EST simpleenroll URL: %s", buf);
718 write_summary(ctx, "EST simpleenroll URL: %s", buf);
719 ctx->no_osu_cert_validation = 1;
720 http_ocsp_set(ctx->http, 1);
721 resp = http_post(ctx->http, buf, req, "application/pkcs10",
722 "Content-Transfer-Encoding: base64",
723 ctx->ca_fname, user, pw, client_cert, client_key,
724 &resp_len);
725 http_ocsp_set(ctx->http,
726 (ctx->workarounds & WORKAROUND_OCSP_OPTIONAL) ? 1 : 2);
727 ctx->no_osu_cert_validation = 0;
728 os_free(buf);
729 if (resp == NULL) {
730 wpa_printf(MSG_INFO, "EST certificate enrollment failed");
731 write_result(ctx, "EST certificate enrollment failed");
732 return -1;
733 }
734 wpa_printf(MSG_DEBUG, "EST simpleenroll response: %s", resp);
735
736 pkcs7 = base64_decode(resp, resp_len, &pkcs7_len);
737 if (pkcs7 == NULL) {
738 wpa_printf(MSG_INFO, "EST workaround - Could not decode base64, assume this is DER encoded PKCS7");
739 pkcs7 = os_malloc(resp_len);
740 if (pkcs7) {
741 os_memcpy(pkcs7, resp, resp_len);
742 pkcs7_len = resp_len;
743 }
744 }
745 os_free(resp);
746
747 if (pkcs7 == NULL) {
748 wpa_printf(MSG_INFO, "Failed to parse simpleenroll base64 response");
749 write_result(ctx, "Failed to parse EST simpleenroll base64 response");
750 return -1;
751 }
752
753 res = pkcs7_to_cert(ctx, pkcs7, pkcs7_len, "Cert/est_cert.pem",
754 "Cert/est_cert.der");
755 os_free(pkcs7);
756
757 if (res < 0) {
758 wpa_printf(MSG_INFO, "EST: Failed to extract certificate from PKCS7 file");
759 write_result(ctx, "EST: Failed to extract certificate from EST PKCS7 file");
760 return -1;
761 }
762
763 wpa_printf(MSG_INFO, "EST simple%senroll completed successfully",
764 ctx->client_cert_present ? "re" : "");
765 write_summary(ctx, "EST simple%senroll completed successfully",
766 ctx->client_cert_present ? "re" : "");
767
768 return 0;
769 }
770