xref: /freebsd/crypto/openssl/engines/e_capi.c (revision f5e9c916afed4a948fe5c03bfaee038d165e12ab)
1 /* engines/e_capi.c */
2 /*
3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4  * project.
5  */
6 /* ====================================================================
7  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in
18  *    the documentation and/or other materials provided with the
19  *    distribution.
20  *
21  * 3. All advertising materials mentioning features or use of this
22  *    software must display the following acknowledgment:
23  *    "This product includes software developed by the OpenSSL Project
24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25  *
26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27  *    endorse or promote products derived from this software without
28  *    prior written permission. For written permission, please contact
29  *    licensing@OpenSSL.org.
30  *
31  * 5. Products derived from this software may not be called "OpenSSL"
32  *    nor may "OpenSSL" appear in their names without prior written
33  *    permission of the OpenSSL Project.
34  *
35  * 6. Redistributions of any form whatsoever must retain the following
36  *    acknowledgment:
37  *    "This product includes software developed by the OpenSSL Project
38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51  * OF THE POSSIBILITY OF SUCH DAMAGE.
52  * ====================================================================
53  */
54 
55 #include <stdio.h>
56 #include <string.h>
57 #include <stdlib.h>
58 
59 #include <openssl/crypto.h>
60 
61 #ifdef OPENSSL_SYS_WIN32
62 # ifndef OPENSSL_NO_CAPIENG
63 
64 #  include <openssl/buffer.h>
65 #  include <openssl/bn.h>
66 #  include <openssl/rsa.h>
67 
68 #  ifndef _WIN32_WINNT
69 #   define _WIN32_WINNT 0x0400
70 #  endif
71 
72 #  include <windows.h>
73 #  include <wincrypt.h>
74 #  include <malloc.h>
75 #  ifndef alloca
76 #   define alloca _alloca
77 #  endif
78 
79 /*
80  * This module uses several "new" interfaces, among which is
81  * CertGetCertificateContextProperty. CERT_KEY_PROV_INFO_PROP_ID is
82  * one of possible values you can pass to function in question. By
83  * checking if it's defined we can see if wincrypt.h and accompanying
84  * crypt32.lib are in shape. The native MingW32 headers up to and
85  * including __W32API_VERSION 3.14 lack of struct DSSPUBKEY and the
86  * defines CERT_STORE_PROV_SYSTEM_A and CERT_STORE_READONLY_FLAG,
87  * so we check for these too and avoid compiling.
88  * Yes, it's rather "weak" test and if compilation fails,
89  * then re-configure with -DOPENSSL_NO_CAPIENG.
90  */
91 #  if defined(CERT_KEY_PROV_INFO_PROP_ID) && \
92     defined(CERT_STORE_PROV_SYSTEM_A) && \
93     defined(CERT_STORE_READONLY_FLAG)
94 #   define __COMPILE_CAPIENG
95 #  endif                        /* CERT_KEY_PROV_INFO_PROP_ID */
96 # endif                         /* OPENSSL_NO_CAPIENG */
97 #endif                          /* OPENSSL_SYS_WIN32 */
98 
99 #ifdef __COMPILE_CAPIENG
100 
101 # undef X509_EXTENSIONS
102 # undef X509_CERT_PAIR
103 
104 /* Definitions which may be missing from earlier version of headers */
105 # ifndef CERT_STORE_OPEN_EXISTING_FLAG
106 #  define CERT_STORE_OPEN_EXISTING_FLAG                   0x00004000
107 # endif
108 
109 # ifndef CERT_STORE_CREATE_NEW_FLAG
110 #  define CERT_STORE_CREATE_NEW_FLAG                      0x00002000
111 # endif
112 
113 # ifndef CERT_SYSTEM_STORE_CURRENT_USER
114 #  define CERT_SYSTEM_STORE_CURRENT_USER                  0x00010000
115 # endif
116 
117 # ifndef ALG_SID_SHA_256
118 #  define ALG_SID_SHA_256                 12
119 # endif
120 # ifndef ALG_SID_SHA_384
121 #  define ALG_SID_SHA_384                 13
122 # endif
123 # ifndef ALG_SID_SHA_512
124 #  define ALG_SID_SHA_512                 14
125 # endif
126 
127 # ifndef CALG_SHA_256
128 #  define CALG_SHA_256            (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SHA_256)
129 # endif
130 # ifndef CALG_SHA_384
131 #  define CALG_SHA_384            (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SHA_384)
132 # endif
133 # ifndef CALG_SHA_512
134 #  define CALG_SHA_512            (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SHA_512)
135 # endif
136 
137 # include <openssl/engine.h>
138 # include <openssl/pem.h>
139 # include <openssl/x509v3.h>
140 
141 # include "e_capi_err.h"
142 # include "e_capi_err.c"
143 
144 static const char *engine_capi_id = "capi";
145 static const char *engine_capi_name = "CryptoAPI ENGINE";
146 
147 typedef struct CAPI_CTX_st CAPI_CTX;
148 typedef struct CAPI_KEY_st CAPI_KEY;
149 
150 static void capi_addlasterror(void);
151 static void capi_adderror(DWORD err);
152 
153 static void CAPI_trace(CAPI_CTX * ctx, char *format, ...);
154 
155 static int capi_list_providers(CAPI_CTX * ctx, BIO *out);
156 static int capi_list_containers(CAPI_CTX * ctx, BIO *out);
157 int capi_list_certs(CAPI_CTX * ctx, BIO *out, char *storename);
158 void capi_free_key(CAPI_KEY * key);
159 
160 static PCCERT_CONTEXT capi_find_cert(CAPI_CTX * ctx, const char *id,
161                                      HCERTSTORE hstore);
162 
163 CAPI_KEY *capi_find_key(CAPI_CTX * ctx, const char *id);
164 
165 static EVP_PKEY *capi_load_privkey(ENGINE *eng, const char *key_id,
166                                    UI_METHOD *ui_method, void *callback_data);
167 static int capi_rsa_sign(int dtype, const unsigned char *m,
168                          unsigned int m_len, unsigned char *sigret,
169                          unsigned int *siglen, const RSA *rsa);
170 static int capi_rsa_priv_enc(int flen, const unsigned char *from,
171                              unsigned char *to, RSA *rsa, int padding);
172 static int capi_rsa_priv_dec(int flen, const unsigned char *from,
173                              unsigned char *to, RSA *rsa, int padding);
174 static int capi_rsa_free(RSA *rsa);
175 
176 static DSA_SIG *capi_dsa_do_sign(const unsigned char *digest, int dlen,
177                                  DSA *dsa);
178 static int capi_dsa_free(DSA *dsa);
179 
180 static int capi_load_ssl_client_cert(ENGINE *e, SSL *ssl,
181                                      STACK_OF(X509_NAME) *ca_dn, X509 **pcert,
182                                      EVP_PKEY **pkey, STACK_OF(X509) **pother,
183                                      UI_METHOD *ui_method,
184                                      void *callback_data);
185 
186 static int cert_select_simple(ENGINE *e, SSL *ssl, STACK_OF(X509) *certs);
187 # ifdef OPENSSL_CAPIENG_DIALOG
188 static int cert_select_dialog(ENGINE *e, SSL *ssl, STACK_OF(X509) *certs);
189 # endif
190 
191 typedef PCCERT_CONTEXT(WINAPI *CERTDLG) (HCERTSTORE, HWND, LPCWSTR,
192                                          LPCWSTR, DWORD, DWORD, void *);
193 typedef HWND(WINAPI *GETCONSWIN) (void);
194 
195 /*
196  * This structure contains CAPI ENGINE specific data: it contains various
197  * global options and affects how other functions behave.
198  */
199 
200 # define CAPI_DBG_TRACE  2
201 # define CAPI_DBG_ERROR  1
202 
203 struct CAPI_CTX_st {
204     int debug_level;
205     char *debug_file;
206     /* Parameters to use for container lookup */
207     DWORD keytype;
208     LPSTR cspname;
209     DWORD csptype;
210     /* Certificate store name to use */
211     LPSTR storename;
212     LPSTR ssl_client_store;
213     /* System store flags */
214     DWORD store_flags;
215 /* Lookup string meanings in load_private_key */
216 /* Substring of subject: uses "storename" */
217 # define CAPI_LU_SUBSTR          1
218 /* Friendly name: uses storename */
219 # define CAPI_LU_FNAME           2
220 /* Container name: uses cspname, keytype */
221 # define CAPI_LU_CONTNAME        3
222     int lookup_method;
223 /* Info to dump with dumpcerts option */
224 /* Issuer and serial name strings */
225 # define CAPI_DMP_SUMMARY        0x1
226 /* Friendly name */
227 # define CAPI_DMP_FNAME          0x2
228 /* Full X509_print dump */
229 # define CAPI_DMP_FULL           0x4
230 /* Dump PEM format certificate */
231 # define CAPI_DMP_PEM            0x8
232 /* Dump pseudo key (if possible) */
233 # define CAPI_DMP_PSKEY          0x10
234 /* Dump key info (if possible) */
235 # define CAPI_DMP_PKEYINFO       0x20
236     DWORD dump_flags;
237     int (*client_cert_select) (ENGINE *e, SSL *ssl, STACK_OF(X509) *certs);
238     CERTDLG certselectdlg;
239     GETCONSWIN getconswindow;
240 };
241 
242 static CAPI_CTX *capi_ctx_new();
243 static void capi_ctx_free(CAPI_CTX * ctx);
244 static int capi_ctx_set_provname(CAPI_CTX * ctx, LPSTR pname, DWORD type,
245                                  int check);
246 static int capi_ctx_set_provname_idx(CAPI_CTX * ctx, int idx);
247 
248 # define CAPI_CMD_LIST_CERTS             ENGINE_CMD_BASE
249 # define CAPI_CMD_LOOKUP_CERT            (ENGINE_CMD_BASE + 1)
250 # define CAPI_CMD_DEBUG_LEVEL            (ENGINE_CMD_BASE + 2)
251 # define CAPI_CMD_DEBUG_FILE             (ENGINE_CMD_BASE + 3)
252 # define CAPI_CMD_KEYTYPE                (ENGINE_CMD_BASE + 4)
253 # define CAPI_CMD_LIST_CSPS              (ENGINE_CMD_BASE + 5)
254 # define CAPI_CMD_SET_CSP_IDX            (ENGINE_CMD_BASE + 6)
255 # define CAPI_CMD_SET_CSP_NAME           (ENGINE_CMD_BASE + 7)
256 # define CAPI_CMD_SET_CSP_TYPE           (ENGINE_CMD_BASE + 8)
257 # define CAPI_CMD_LIST_CONTAINERS        (ENGINE_CMD_BASE + 9)
258 # define CAPI_CMD_LIST_OPTIONS           (ENGINE_CMD_BASE + 10)
259 # define CAPI_CMD_LOOKUP_METHOD          (ENGINE_CMD_BASE + 11)
260 # define CAPI_CMD_STORE_NAME             (ENGINE_CMD_BASE + 12)
261 # define CAPI_CMD_STORE_FLAGS            (ENGINE_CMD_BASE + 13)
262 
263 static const ENGINE_CMD_DEFN capi_cmd_defns[] = {
264     {CAPI_CMD_LIST_CERTS,
265      "list_certs",
266      "List all certificates in store",
267      ENGINE_CMD_FLAG_NO_INPUT},
268     {CAPI_CMD_LOOKUP_CERT,
269      "lookup_cert",
270      "Lookup and output certificates",
271      ENGINE_CMD_FLAG_STRING},
272     {CAPI_CMD_DEBUG_LEVEL,
273      "debug_level",
274      "debug level (1=errors, 2=trace)",
275      ENGINE_CMD_FLAG_NUMERIC},
276     {CAPI_CMD_DEBUG_FILE,
277      "debug_file",
278      "debugging filename)",
279      ENGINE_CMD_FLAG_STRING},
280     {CAPI_CMD_KEYTYPE,
281      "key_type",
282      "Key type: 1=AT_KEYEXCHANGE (default), 2=AT_SIGNATURE",
283      ENGINE_CMD_FLAG_NUMERIC},
284     {CAPI_CMD_LIST_CSPS,
285      "list_csps",
286      "List all CSPs",
287      ENGINE_CMD_FLAG_NO_INPUT},
288     {CAPI_CMD_SET_CSP_IDX,
289      "csp_idx",
290      "Set CSP by index",
291      ENGINE_CMD_FLAG_NUMERIC},
292     {CAPI_CMD_SET_CSP_NAME,
293      "csp_name",
294      "Set CSP name, (default CSP used if not specified)",
295      ENGINE_CMD_FLAG_STRING},
296     {CAPI_CMD_SET_CSP_TYPE,
297      "csp_type",
298      "Set CSP type, (default RSA_PROV_FULL)",
299      ENGINE_CMD_FLAG_NUMERIC},
300     {CAPI_CMD_LIST_CONTAINERS,
301      "list_containers",
302      "list container names",
303      ENGINE_CMD_FLAG_NO_INPUT},
304     {CAPI_CMD_LIST_OPTIONS,
305      "list_options",
306      "Set list options (1=summary,2=friendly name, 4=full printout, 8=PEM output, 16=XXX, "
307      "32=private key info)",
308      ENGINE_CMD_FLAG_NUMERIC},
309     {CAPI_CMD_LOOKUP_METHOD,
310      "lookup_method",
311      "Set key lookup method (1=substring, 2=friendlyname, 3=container name)",
312      ENGINE_CMD_FLAG_NUMERIC},
313     {CAPI_CMD_STORE_NAME,
314      "store_name",
315      "certificate store name, default \"MY\"",
316      ENGINE_CMD_FLAG_STRING},
317     {CAPI_CMD_STORE_FLAGS,
318      "store_flags",
319      "Certificate store flags: 1 = system store",
320      ENGINE_CMD_FLAG_NUMERIC},
321 
322     {0, NULL, NULL, 0}
323 };
324 
325 static int capi_idx = -1;
326 static int rsa_capi_idx = -1;
327 static int dsa_capi_idx = -1;
328 static int cert_capi_idx = -1;
329 
330 static int capi_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
331 {
332     int ret = 1;
333     CAPI_CTX *ctx;
334     BIO *out;
335     if (capi_idx == -1) {
336         CAPIerr(CAPI_F_CAPI_CTRL, CAPI_R_ENGINE_NOT_INITIALIZED);
337         return 0;
338     }
339     ctx = ENGINE_get_ex_data(e, capi_idx);
340     out = BIO_new_fp(stdout, BIO_NOCLOSE);
341     switch (cmd) {
342     case CAPI_CMD_LIST_CSPS:
343         ret = capi_list_providers(ctx, out);
344         break;
345 
346     case CAPI_CMD_LIST_CERTS:
347         ret = capi_list_certs(ctx, out, NULL);
348         break;
349 
350     case CAPI_CMD_LOOKUP_CERT:
351         ret = capi_list_certs(ctx, out, p);
352         break;
353 
354     case CAPI_CMD_LIST_CONTAINERS:
355         ret = capi_list_containers(ctx, out);
356         break;
357 
358     case CAPI_CMD_STORE_NAME:
359         if (ctx->storename)
360             OPENSSL_free(ctx->storename);
361         ctx->storename = BUF_strdup(p);
362         CAPI_trace(ctx, "Setting store name to %s\n", p);
363         break;
364 
365     case CAPI_CMD_STORE_FLAGS:
366         if (i & 1) {
367             ctx->store_flags |= CERT_SYSTEM_STORE_LOCAL_MACHINE;
368             ctx->store_flags &= ~CERT_SYSTEM_STORE_CURRENT_USER;
369         } else {
370             ctx->store_flags |= CERT_SYSTEM_STORE_CURRENT_USER;
371             ctx->store_flags &= ~CERT_SYSTEM_STORE_LOCAL_MACHINE;
372         }
373         CAPI_trace(ctx, "Setting flags to %d\n", i);
374         break;
375 
376     case CAPI_CMD_DEBUG_LEVEL:
377         ctx->debug_level = (int)i;
378         CAPI_trace(ctx, "Setting debug level to %d\n", ctx->debug_level);
379         break;
380 
381     case CAPI_CMD_DEBUG_FILE:
382         ctx->debug_file = BUF_strdup(p);
383         CAPI_trace(ctx, "Setting debug file to %s\n", ctx->debug_file);
384         break;
385 
386     case CAPI_CMD_KEYTYPE:
387         ctx->keytype = i;
388         CAPI_trace(ctx, "Setting key type to %d\n", ctx->keytype);
389         break;
390 
391     case CAPI_CMD_SET_CSP_IDX:
392         ret = capi_ctx_set_provname_idx(ctx, i);
393         break;
394 
395     case CAPI_CMD_LIST_OPTIONS:
396         ctx->dump_flags = i;
397         break;
398 
399     case CAPI_CMD_LOOKUP_METHOD:
400         if (i < 1 || i > 3) {
401             CAPIerr(CAPI_F_CAPI_CTRL, CAPI_R_INVALID_LOOKUP_METHOD);
402             return 0;
403         }
404         ctx->lookup_method = i;
405         break;
406 
407     case CAPI_CMD_SET_CSP_NAME:
408         ret = capi_ctx_set_provname(ctx, p, ctx->csptype, 1);
409         break;
410 
411     case CAPI_CMD_SET_CSP_TYPE:
412         ctx->csptype = i;
413         break;
414 
415     default:
416         CAPIerr(CAPI_F_CAPI_CTRL, CAPI_R_UNKNOWN_COMMAND);
417         ret = 0;
418     }
419 
420     BIO_free(out);
421     return ret;
422 
423 }
424 
425 static RSA_METHOD capi_rsa_method = {
426     "CryptoAPI RSA method",
427     0,                          /* pub_enc */
428     0,                          /* pub_dec */
429     capi_rsa_priv_enc,          /* priv_enc */
430     capi_rsa_priv_dec,          /* priv_dec */
431     0,                          /* rsa_mod_exp */
432     0,                          /* bn_mod_exp */
433     0,                          /* init */
434     capi_rsa_free,              /* finish */
435     RSA_FLAG_SIGN_VER,          /* flags */
436     NULL,                       /* app_data */
437     capi_rsa_sign,              /* rsa_sign */
438     0                           /* rsa_verify */
439 };
440 
441 static DSA_METHOD capi_dsa_method = {
442     "CryptoAPI DSA method",
443     capi_dsa_do_sign,           /* dsa_do_sign */
444     0,                          /* dsa_sign_setup */
445     0,                          /* dsa_do_verify */
446     0,                          /* dsa_mod_exp */
447     0,                          /* bn_mod_exp */
448     0,                          /* init */
449     capi_dsa_free,              /* finish */
450     0,                          /* flags */
451     NULL,                       /* app_data */
452     0,                          /* dsa_paramgen */
453     0                           /* dsa_keygen */
454 };
455 
456 static int capi_init(ENGINE *e)
457 {
458     CAPI_CTX *ctx;
459     const RSA_METHOD *ossl_rsa_meth;
460     const DSA_METHOD *ossl_dsa_meth;
461 
462     if (capi_idx < 0) {
463         capi_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, 0);
464         if (capi_idx < 0)
465             goto memerr;
466 
467         cert_capi_idx = X509_get_ex_new_index(0, NULL, NULL, NULL, 0);
468 
469         /* Setup RSA_METHOD */
470         rsa_capi_idx = RSA_get_ex_new_index(0, NULL, NULL, NULL, 0);
471         ossl_rsa_meth = RSA_PKCS1_SSLeay();
472         capi_rsa_method.rsa_pub_enc = ossl_rsa_meth->rsa_pub_enc;
473         capi_rsa_method.rsa_pub_dec = ossl_rsa_meth->rsa_pub_dec;
474         capi_rsa_method.rsa_mod_exp = ossl_rsa_meth->rsa_mod_exp;
475         capi_rsa_method.bn_mod_exp = ossl_rsa_meth->bn_mod_exp;
476 
477         /* Setup DSA Method */
478         dsa_capi_idx = DSA_get_ex_new_index(0, NULL, NULL, NULL, 0);
479         ossl_dsa_meth = DSA_OpenSSL();
480         capi_dsa_method.dsa_do_verify = ossl_dsa_meth->dsa_do_verify;
481         capi_dsa_method.dsa_mod_exp = ossl_dsa_meth->dsa_mod_exp;
482         capi_dsa_method.bn_mod_exp = ossl_dsa_meth->bn_mod_exp;
483     }
484 
485     ctx = capi_ctx_new();
486     if (!ctx)
487         goto memerr;
488 
489     ENGINE_set_ex_data(e, capi_idx, ctx);
490 
491 # ifdef OPENSSL_CAPIENG_DIALOG
492     {
493         HMODULE cryptui = LoadLibrary(TEXT("CRYPTUI.DLL"));
494         HMODULE kernel = GetModuleHandle(TEXT("KERNEL32.DLL"));
495         if (cryptui)
496             ctx->certselectdlg =
497                 (CERTDLG) GetProcAddress(cryptui,
498                                          "CryptUIDlgSelectCertificateFromStore");
499         if (kernel)
500             ctx->getconswindow =
501                 (GETCONSWIN) GetProcAddress(kernel, "GetConsoleWindow");
502         if (cryptui && !OPENSSL_isservice())
503             ctx->client_cert_select = cert_select_dialog;
504     }
505 # endif
506 
507     return 1;
508 
509  memerr:
510     CAPIerr(CAPI_F_CAPI_INIT, ERR_R_MALLOC_FAILURE);
511     return 0;
512 
513     return 1;
514 }
515 
516 static int capi_destroy(ENGINE *e)
517 {
518     ERR_unload_CAPI_strings();
519     return 1;
520 }
521 
522 static int capi_finish(ENGINE *e)
523 {
524     CAPI_CTX *ctx;
525     ctx = ENGINE_get_ex_data(e, capi_idx);
526     capi_ctx_free(ctx);
527     ENGINE_set_ex_data(e, capi_idx, NULL);
528     return 1;
529 }
530 
531 /*
532  * CryptoAPI key application data. This contains a handle to the private key
533  * container (for sign operations) and a handle to the key (for decrypt
534  * operations).
535  */
536 
537 struct CAPI_KEY_st {
538     /* Associated certificate context (if any) */
539     PCCERT_CONTEXT pcert;
540     HCRYPTPROV hprov;
541     HCRYPTKEY key;
542     DWORD keyspec;
543 };
544 
545 static int bind_capi(ENGINE *e)
546 {
547     if (!ENGINE_set_id(e, engine_capi_id)
548         || !ENGINE_set_name(e, engine_capi_name)
549         || !ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL)
550         || !ENGINE_set_init_function(e, capi_init)
551         || !ENGINE_set_finish_function(e, capi_finish)
552         || !ENGINE_set_destroy_function(e, capi_destroy)
553         || !ENGINE_set_RSA(e, &capi_rsa_method)
554         || !ENGINE_set_DSA(e, &capi_dsa_method)
555         || !ENGINE_set_load_privkey_function(e, capi_load_privkey)
556         || !ENGINE_set_load_ssl_client_cert_function(e,
557                                                      capi_load_ssl_client_cert)
558         || !ENGINE_set_cmd_defns(e, capi_cmd_defns)
559         || !ENGINE_set_ctrl_function(e, capi_ctrl))
560         return 0;
561     ERR_load_CAPI_strings();
562 
563     return 1;
564 
565 }
566 
567 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
568 static int bind_helper(ENGINE *e, const char *id)
569 {
570     if (id && (strcmp(id, engine_capi_id) != 0))
571         return 0;
572     if (!bind_capi(e))
573         return 0;
574     return 1;
575 }
576 
577 IMPLEMENT_DYNAMIC_CHECK_FN()
578     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
579 # else
580 static ENGINE *engine_capi(void)
581 {
582     ENGINE *ret = ENGINE_new();
583     if (!ret)
584         return NULL;
585     if (!bind_capi(ret)) {
586         ENGINE_free(ret);
587         return NULL;
588     }
589     return ret;
590 }
591 
592 void ENGINE_load_capi(void)
593 {
594     /* Copied from eng_[openssl|dyn].c */
595     ENGINE *toadd = engine_capi();
596     if (!toadd)
597         return;
598     ENGINE_add(toadd);
599     ENGINE_free(toadd);
600     ERR_clear_error();
601 }
602 # endif
603 
604 static int lend_tobn(BIGNUM *bn, unsigned char *bin, int binlen)
605 {
606     int i;
607     /*
608      * Reverse buffer in place: since this is a keyblob structure that will
609      * be freed up after conversion anyway it doesn't matter if we change
610      * it.
611      */
612     for (i = 0; i < binlen / 2; i++) {
613         unsigned char c;
614         c = bin[i];
615         bin[i] = bin[binlen - i - 1];
616         bin[binlen - i - 1] = c;
617     }
618 
619     if (!BN_bin2bn(bin, binlen, bn))
620         return 0;
621     return 1;
622 }
623 
624 /* Given a CAPI_KEY get an EVP_PKEY structure */
625 
626 static EVP_PKEY *capi_get_pkey(ENGINE *eng, CAPI_KEY * key)
627 {
628     unsigned char *pubkey = NULL;
629     DWORD len;
630     BLOBHEADER *bh;
631     RSA *rkey = NULL;
632     DSA *dkey = NULL;
633     EVP_PKEY *ret = NULL;
634     if (!CryptExportKey(key->key, 0, PUBLICKEYBLOB, 0, NULL, &len)) {
635         CAPIerr(CAPI_F_CAPI_GET_PKEY, CAPI_R_PUBKEY_EXPORT_LENGTH_ERROR);
636         capi_addlasterror();
637         return NULL;
638     }
639 
640     pubkey = OPENSSL_malloc(len);
641 
642     if (!pubkey)
643         goto memerr;
644 
645     if (!CryptExportKey(key->key, 0, PUBLICKEYBLOB, 0, pubkey, &len)) {
646         CAPIerr(CAPI_F_CAPI_GET_PKEY, CAPI_R_PUBKEY_EXPORT_ERROR);
647         capi_addlasterror();
648         goto err;
649     }
650 
651     bh = (BLOBHEADER *) pubkey;
652     if (bh->bType != PUBLICKEYBLOB) {
653         CAPIerr(CAPI_F_CAPI_GET_PKEY, CAPI_R_INVALID_PUBLIC_KEY_BLOB);
654         goto err;
655     }
656     if (bh->aiKeyAlg == CALG_RSA_SIGN || bh->aiKeyAlg == CALG_RSA_KEYX) {
657         RSAPUBKEY *rp;
658         DWORD rsa_modlen;
659         unsigned char *rsa_modulus;
660         rp = (RSAPUBKEY *) (bh + 1);
661         if (rp->magic != 0x31415352) {
662             char magstr[10];
663             BIO_snprintf(magstr, 10, "%lx", rp->magic);
664             CAPIerr(CAPI_F_CAPI_GET_PKEY,
665                     CAPI_R_INVALID_RSA_PUBLIC_KEY_BLOB_MAGIC_NUMBER);
666             ERR_add_error_data(2, "magic=0x", magstr);
667             goto err;
668         }
669         rsa_modulus = (unsigned char *)(rp + 1);
670         rkey = RSA_new_method(eng);
671         if (!rkey)
672             goto memerr;
673 
674         rkey->e = BN_new();
675         rkey->n = BN_new();
676 
677         if (!rkey->e || !rkey->n)
678             goto memerr;
679 
680         if (!BN_set_word(rkey->e, rp->pubexp))
681             goto memerr;
682 
683         rsa_modlen = rp->bitlen / 8;
684         if (!lend_tobn(rkey->n, rsa_modulus, rsa_modlen))
685             goto memerr;
686 
687         RSA_set_ex_data(rkey, rsa_capi_idx, key);
688 
689         if (!(ret = EVP_PKEY_new()))
690             goto memerr;
691 
692         EVP_PKEY_assign_RSA(ret, rkey);
693         rkey = NULL;
694 
695     } else if (bh->aiKeyAlg == CALG_DSS_SIGN) {
696         DSSPUBKEY *dp;
697         DWORD dsa_plen;
698         unsigned char *btmp;
699         dp = (DSSPUBKEY *) (bh + 1);
700         if (dp->magic != 0x31535344) {
701             char magstr[10];
702             BIO_snprintf(magstr, 10, "%lx", dp->magic);
703             CAPIerr(CAPI_F_CAPI_GET_PKEY,
704                     CAPI_R_INVALID_DSA_PUBLIC_KEY_BLOB_MAGIC_NUMBER);
705             ERR_add_error_data(2, "magic=0x", magstr);
706             goto err;
707         }
708         dsa_plen = dp->bitlen / 8;
709         btmp = (unsigned char *)(dp + 1);
710         dkey = DSA_new_method(eng);
711         if (!dkey)
712             goto memerr;
713         dkey->p = BN_new();
714         dkey->q = BN_new();
715         dkey->g = BN_new();
716         dkey->pub_key = BN_new();
717         if (!dkey->p || !dkey->q || !dkey->g || !dkey->pub_key)
718             goto memerr;
719         if (!lend_tobn(dkey->p, btmp, dsa_plen))
720             goto memerr;
721         btmp += dsa_plen;
722         if (!lend_tobn(dkey->q, btmp, 20))
723             goto memerr;
724         btmp += 20;
725         if (!lend_tobn(dkey->g, btmp, dsa_plen))
726             goto memerr;
727         btmp += dsa_plen;
728         if (!lend_tobn(dkey->pub_key, btmp, dsa_plen))
729             goto memerr;
730         btmp += dsa_plen;
731 
732         DSA_set_ex_data(dkey, dsa_capi_idx, key);
733 
734         if (!(ret = EVP_PKEY_new()))
735             goto memerr;
736 
737         EVP_PKEY_assign_DSA(ret, dkey);
738         dkey = NULL;
739     } else {
740         char algstr[10];
741         BIO_snprintf(algstr, 10, "%lx", bh->aiKeyAlg);
742         CAPIerr(CAPI_F_CAPI_GET_PKEY,
743                 CAPI_R_UNSUPPORTED_PUBLIC_KEY_ALGORITHM);
744         ERR_add_error_data(2, "aiKeyAlg=0x", algstr);
745         goto err;
746     }
747 
748  err:
749     if (pubkey)
750         OPENSSL_free(pubkey);
751     if (!ret) {
752         if (rkey)
753             RSA_free(rkey);
754         if (dkey)
755             DSA_free(dkey);
756     }
757 
758     return ret;
759 
760  memerr:
761     CAPIerr(CAPI_F_CAPI_GET_PKEY, ERR_R_MALLOC_FAILURE);
762     goto err;
763 
764 }
765 
766 static EVP_PKEY *capi_load_privkey(ENGINE *eng, const char *key_id,
767                                    UI_METHOD *ui_method, void *callback_data)
768 {
769     CAPI_CTX *ctx;
770     CAPI_KEY *key;
771     EVP_PKEY *ret;
772     ctx = ENGINE_get_ex_data(eng, capi_idx);
773 
774     if (!ctx) {
775         CAPIerr(CAPI_F_CAPI_LOAD_PRIVKEY, CAPI_R_CANT_FIND_CAPI_CONTEXT);
776         return NULL;
777     }
778 
779     key = capi_find_key(ctx, key_id);
780 
781     if (!key)
782         return NULL;
783 
784     ret = capi_get_pkey(eng, key);
785 
786     if (!ret)
787         capi_free_key(key);
788     return ret;
789 
790 }
791 
792 /* CryptoAPI RSA operations */
793 
794 int capi_rsa_priv_enc(int flen, const unsigned char *from,
795                       unsigned char *to, RSA *rsa, int padding)
796 {
797     CAPIerr(CAPI_F_CAPI_RSA_PRIV_ENC, CAPI_R_FUNCTION_NOT_SUPPORTED);
798     return -1;
799 }
800 
801 int capi_rsa_sign(int dtype, const unsigned char *m, unsigned int m_len,
802                   unsigned char *sigret, unsigned int *siglen, const RSA *rsa)
803 {
804     ALG_ID alg;
805     HCRYPTHASH hash;
806     DWORD slen;
807     unsigned int i;
808     int ret = -1;
809     CAPI_KEY *capi_key;
810     CAPI_CTX *ctx;
811 
812     ctx = ENGINE_get_ex_data(rsa->engine, capi_idx);
813 
814     CAPI_trace(ctx, "Called CAPI_rsa_sign()\n");
815 
816     capi_key = RSA_get_ex_data(rsa, rsa_capi_idx);
817     if (!capi_key) {
818         CAPIerr(CAPI_F_CAPI_RSA_SIGN, CAPI_R_CANT_GET_KEY);
819         return -1;
820     }
821 /* Convert the signature type to a CryptoAPI algorithm ID */
822     switch (dtype) {
823     case NID_sha256:
824         alg = CALG_SHA_256;
825         break;
826 
827     case NID_sha384:
828         alg = CALG_SHA_384;
829         break;
830 
831     case NID_sha512:
832         alg = CALG_SHA_512;
833         break;
834 
835     case NID_sha1:
836         alg = CALG_SHA1;
837         break;
838 
839     case NID_md5:
840         alg = CALG_MD5;
841         break;
842 
843     case NID_md5_sha1:
844         alg = CALG_SSL3_SHAMD5;
845         break;
846     default:
847         {
848             char algstr[10];
849             BIO_snprintf(algstr, 10, "%lx", dtype);
850             CAPIerr(CAPI_F_CAPI_RSA_SIGN, CAPI_R_UNSUPPORTED_ALGORITHM_NID);
851             ERR_add_error_data(2, "NID=0x", algstr);
852             return -1;
853         }
854     }
855 
856 /* Create the hash object */
857     if (!CryptCreateHash(capi_key->hprov, alg, 0, 0, &hash)) {
858         CAPIerr(CAPI_F_CAPI_RSA_SIGN, CAPI_R_CANT_CREATE_HASH_OBJECT);
859         capi_addlasterror();
860         return -1;
861     }
862 /* Set the hash value to the value passed */
863 
864     if (!CryptSetHashParam(hash, HP_HASHVAL, (unsigned char *)m, 0)) {
865         CAPIerr(CAPI_F_CAPI_RSA_SIGN, CAPI_R_CANT_SET_HASH_VALUE);
866         capi_addlasterror();
867         goto err;
868     }
869 
870 /* Finally sign it */
871     slen = RSA_size(rsa);
872     if (!CryptSignHash(hash, capi_key->keyspec, NULL, 0, sigret, &slen)) {
873         CAPIerr(CAPI_F_CAPI_RSA_SIGN, CAPI_R_ERROR_SIGNING_HASH);
874         capi_addlasterror();
875         goto err;
876     } else {
877         ret = 1;
878         /* Inplace byte reversal of signature */
879         for (i = 0; i < slen / 2; i++) {
880             unsigned char c;
881             c = sigret[i];
882             sigret[i] = sigret[slen - i - 1];
883             sigret[slen - i - 1] = c;
884         }
885         *siglen = slen;
886     }
887 
888     /* Now cleanup */
889 
890  err:
891     CryptDestroyHash(hash);
892 
893     return ret;
894 }
895 
896 int capi_rsa_priv_dec(int flen, const unsigned char *from,
897                       unsigned char *to, RSA *rsa, int padding)
898 {
899     int i;
900     unsigned char *tmpbuf;
901     CAPI_KEY *capi_key;
902     CAPI_CTX *ctx;
903     ctx = ENGINE_get_ex_data(rsa->engine, capi_idx);
904 
905     CAPI_trace(ctx, "Called capi_rsa_priv_dec()\n");
906 
907     capi_key = RSA_get_ex_data(rsa, rsa_capi_idx);
908     if (!capi_key) {
909         CAPIerr(CAPI_F_CAPI_RSA_PRIV_DEC, CAPI_R_CANT_GET_KEY);
910         return -1;
911     }
912 
913     if (padding != RSA_PKCS1_PADDING) {
914         char errstr[10];
915         BIO_snprintf(errstr, 10, "%d", padding);
916         CAPIerr(CAPI_F_CAPI_RSA_PRIV_DEC, CAPI_R_UNSUPPORTED_PADDING);
917         ERR_add_error_data(2, "padding=", errstr);
918         return -1;
919     }
920 
921     /* Create temp reverse order version of input */
922     if (!(tmpbuf = OPENSSL_malloc(flen))) {
923         CAPIerr(CAPI_F_CAPI_RSA_PRIV_DEC, ERR_R_MALLOC_FAILURE);
924         return -1;
925     }
926     for (i = 0; i < flen; i++)
927         tmpbuf[flen - i - 1] = from[i];
928 
929     /* Finally decrypt it */
930     if (!CryptDecrypt(capi_key->key, 0, TRUE, 0, tmpbuf, &flen)) {
931         CAPIerr(CAPI_F_CAPI_RSA_PRIV_DEC, CAPI_R_DECRYPT_ERROR);
932         capi_addlasterror();
933         OPENSSL_free(tmpbuf);
934         return -1;
935     } else
936         memcpy(to, tmpbuf, flen);
937 
938     OPENSSL_free(tmpbuf);
939 
940     return flen;
941 }
942 
943 static int capi_rsa_free(RSA *rsa)
944 {
945     CAPI_KEY *capi_key;
946     capi_key = RSA_get_ex_data(rsa, rsa_capi_idx);
947     capi_free_key(capi_key);
948     RSA_set_ex_data(rsa, rsa_capi_idx, 0);
949     return 1;
950 }
951 
952 /* CryptoAPI DSA operations */
953 
954 static DSA_SIG *capi_dsa_do_sign(const unsigned char *digest, int dlen,
955                                  DSA *dsa)
956 {
957     HCRYPTHASH hash;
958     DWORD slen;
959     DSA_SIG *ret = NULL;
960     CAPI_KEY *capi_key;
961     CAPI_CTX *ctx;
962     unsigned char csigbuf[40];
963 
964     ctx = ENGINE_get_ex_data(dsa->engine, capi_idx);
965 
966     CAPI_trace(ctx, "Called CAPI_dsa_do_sign()\n");
967 
968     capi_key = DSA_get_ex_data(dsa, dsa_capi_idx);
969 
970     if (!capi_key) {
971         CAPIerr(CAPI_F_CAPI_DSA_DO_SIGN, CAPI_R_CANT_GET_KEY);
972         return NULL;
973     }
974 
975     if (dlen != 20) {
976         CAPIerr(CAPI_F_CAPI_DSA_DO_SIGN, CAPI_R_INVALID_DIGEST_LENGTH);
977         return NULL;
978     }
979 
980     /* Create the hash object */
981     if (!CryptCreateHash(capi_key->hprov, CALG_SHA1, 0, 0, &hash)) {
982         CAPIerr(CAPI_F_CAPI_DSA_DO_SIGN, CAPI_R_CANT_CREATE_HASH_OBJECT);
983         capi_addlasterror();
984         return NULL;
985     }
986 
987     /* Set the hash value to the value passed */
988     if (!CryptSetHashParam(hash, HP_HASHVAL, (unsigned char *)digest, 0)) {
989         CAPIerr(CAPI_F_CAPI_DSA_DO_SIGN, CAPI_R_CANT_SET_HASH_VALUE);
990         capi_addlasterror();
991         goto err;
992     }
993 
994     /* Finally sign it */
995     slen = sizeof(csigbuf);
996     if (!CryptSignHash(hash, capi_key->keyspec, NULL, 0, csigbuf, &slen)) {
997         CAPIerr(CAPI_F_CAPI_DSA_DO_SIGN, CAPI_R_ERROR_SIGNING_HASH);
998         capi_addlasterror();
999         goto err;
1000     } else {
1001         ret = DSA_SIG_new();
1002         if (!ret)
1003             goto err;
1004         ret->r = BN_new();
1005         ret->s = BN_new();
1006         if (!ret->r || !ret->s)
1007             goto err;
1008         if (!lend_tobn(ret->r, csigbuf, 20)
1009             || !lend_tobn(ret->s, csigbuf + 20, 20)) {
1010             DSA_SIG_free(ret);
1011             ret = NULL;
1012             goto err;
1013         }
1014     }
1015 
1016     /* Now cleanup */
1017 
1018  err:
1019     OPENSSL_cleanse(csigbuf, 40);
1020     CryptDestroyHash(hash);
1021     return ret;
1022 }
1023 
1024 static int capi_dsa_free(DSA *dsa)
1025 {
1026     CAPI_KEY *capi_key;
1027     capi_key = DSA_get_ex_data(dsa, dsa_capi_idx);
1028     capi_free_key(capi_key);
1029     DSA_set_ex_data(dsa, dsa_capi_idx, 0);
1030     return 1;
1031 }
1032 
1033 static void capi_vtrace(CAPI_CTX * ctx, int level, char *format,
1034                         va_list argptr)
1035 {
1036     BIO *out;
1037 
1038     if (!ctx || (ctx->debug_level < level) || (!ctx->debug_file))
1039         return;
1040     out = BIO_new_file(ctx->debug_file, "a+");
1041     BIO_vprintf(out, format, argptr);
1042     BIO_free(out);
1043 }
1044 
1045 static void CAPI_trace(CAPI_CTX * ctx, char *format, ...)
1046 {
1047     va_list args;
1048     va_start(args, format);
1049     capi_vtrace(ctx, CAPI_DBG_TRACE, format, args);
1050     va_end(args);
1051 }
1052 
1053 static void capi_addlasterror(void)
1054 {
1055     capi_adderror(GetLastError());
1056 }
1057 
1058 static void capi_adderror(DWORD err)
1059 {
1060     char errstr[10];
1061     BIO_snprintf(errstr, 10, "%lX", err);
1062     ERR_add_error_data(2, "Error code= 0x", errstr);
1063 }
1064 
1065 static char *wide_to_asc(LPCWSTR wstr)
1066 {
1067     char *str;
1068     int len_0, sz;
1069 
1070     if (!wstr)
1071         return NULL;
1072     len_0 = (int)wcslen(wstr) + 1; /* WideCharToMultiByte expects int */
1073     sz = WideCharToMultiByte(CP_ACP, 0, wstr, len_0, NULL, 0, NULL, NULL);
1074     if (!sz) {
1075         CAPIerr(CAPI_F_WIDE_TO_ASC, CAPI_R_WIN32_ERROR);
1076         return NULL;
1077     }
1078     str = OPENSSL_malloc(sz);
1079     if (!str) {
1080         CAPIerr(CAPI_F_WIDE_TO_ASC, ERR_R_MALLOC_FAILURE);
1081         return NULL;
1082     }
1083     if (!WideCharToMultiByte(CP_ACP, 0, wstr, len_0, str, sz, NULL, NULL)) {
1084         OPENSSL_free(str);
1085         CAPIerr(CAPI_F_WIDE_TO_ASC, CAPI_R_WIN32_ERROR);
1086         return NULL;
1087     }
1088     return str;
1089 }
1090 
1091 static int capi_get_provname(CAPI_CTX * ctx, LPSTR * pname, DWORD * ptype,
1092                              DWORD idx)
1093 {
1094     DWORD len, err;
1095     LPTSTR name;
1096     CAPI_trace(ctx, "capi_get_provname, index=%d\n", idx);
1097     if (!CryptEnumProviders(idx, NULL, 0, ptype, NULL, &len)) {
1098         err = GetLastError();
1099         if (err == ERROR_NO_MORE_ITEMS)
1100             return 2;
1101         CAPIerr(CAPI_F_CAPI_GET_PROVNAME, CAPI_R_CRYPTENUMPROVIDERS_ERROR);
1102         capi_adderror(err);
1103         return 0;
1104     }
1105     if (sizeof(TCHAR) != sizeof(char))
1106         name = alloca(len);
1107     else
1108         name = OPENSSL_malloc(len);
1109     if (!CryptEnumProviders(idx, NULL, 0, ptype, name, &len)) {
1110         err = GetLastError();
1111         if (err == ERROR_NO_MORE_ITEMS)
1112             return 2;
1113         CAPIerr(CAPI_F_CAPI_GET_PROVNAME, CAPI_R_CRYPTENUMPROVIDERS_ERROR);
1114         capi_adderror(err);
1115         return 0;
1116     }
1117     if (sizeof(TCHAR) != sizeof(char))
1118         *pname = wide_to_asc((WCHAR *)name);
1119     else
1120         *pname = (char *)name;
1121     CAPI_trace(ctx, "capi_get_provname, returned name=%s, type=%d\n", *pname,
1122                *ptype);
1123 
1124     return 1;
1125 }
1126 
1127 static int capi_list_providers(CAPI_CTX * ctx, BIO *out)
1128 {
1129     DWORD idx, ptype;
1130     int ret;
1131     LPSTR provname = NULL;
1132     CAPI_trace(ctx, "capi_list_providers\n");
1133     BIO_printf(out, "Available CSPs:\n");
1134     for (idx = 0;; idx++) {
1135         ret = capi_get_provname(ctx, &provname, &ptype, idx);
1136         if (ret == 2)
1137             break;
1138         if (ret == 0)
1139             break;
1140         BIO_printf(out, "%d. %s, type %d\n", idx, provname, ptype);
1141         OPENSSL_free(provname);
1142     }
1143     return 1;
1144 }
1145 
1146 static int capi_list_containers(CAPI_CTX * ctx, BIO *out)
1147 {
1148     int ret = 1;
1149     HCRYPTPROV hprov;
1150     DWORD err, idx, flags, buflen = 0, clen;
1151     LPSTR cname;
1152     LPTSTR cspname = NULL;
1153 
1154     CAPI_trace(ctx, "Listing containers CSP=%s, type = %d\n", ctx->cspname,
1155                ctx->csptype);
1156     if (ctx->cspname && sizeof(TCHAR) != sizeof(char)) {
1157         if ((clen =
1158              MultiByteToWideChar(CP_ACP, 0, ctx->cspname, -1, NULL, 0))) {
1159             cspname = alloca(clen * sizeof(WCHAR));
1160             MultiByteToWideChar(CP_ACP, 0, ctx->cspname, -1, (WCHAR *)cspname,
1161                                 clen);
1162         }
1163         if (!cspname) {
1164             CAPIerr(CAPI_F_CAPI_LIST_CONTAINERS, ERR_R_MALLOC_FAILURE);
1165             capi_addlasterror();
1166             return 0;
1167         }
1168     } else
1169         cspname = (TCHAR *)ctx->cspname;
1170     if (!CryptAcquireContext
1171         (&hprov, NULL, cspname, ctx->csptype, CRYPT_VERIFYCONTEXT)) {
1172         CAPIerr(CAPI_F_CAPI_LIST_CONTAINERS,
1173                 CAPI_R_CRYPTACQUIRECONTEXT_ERROR);
1174         capi_addlasterror();
1175         return 0;
1176     }
1177     if (!CryptGetProvParam
1178         (hprov, PP_ENUMCONTAINERS, NULL, &buflen, CRYPT_FIRST)) {
1179         CAPIerr(CAPI_F_CAPI_LIST_CONTAINERS, CAPI_R_ENUMCONTAINERS_ERROR);
1180         capi_addlasterror();
1181         CryptReleaseContext(hprov, 0);
1182         return 0;
1183     }
1184     CAPI_trace(ctx, "Got max container len %d\n", buflen);
1185     if (buflen == 0)
1186         buflen = 1024;
1187     cname = OPENSSL_malloc(buflen);
1188     if (!cname) {
1189         CAPIerr(CAPI_F_CAPI_LIST_CONTAINERS, ERR_R_MALLOC_FAILURE);
1190         goto err;
1191     }
1192 
1193     for (idx = 0;; idx++) {
1194         clen = buflen;
1195         cname[0] = 0;
1196 
1197         if (idx == 0)
1198             flags = CRYPT_FIRST;
1199         else
1200             flags = 0;
1201         if (!CryptGetProvParam
1202             (hprov, PP_ENUMCONTAINERS, (BYTE *) cname, &clen, flags)) {
1203             err = GetLastError();
1204             if (err == ERROR_NO_MORE_ITEMS)
1205                 goto done;
1206             CAPIerr(CAPI_F_CAPI_LIST_CONTAINERS, CAPI_R_ENUMCONTAINERS_ERROR);
1207             capi_adderror(err);
1208             goto err;
1209         }
1210         CAPI_trace(ctx, "Container name %s, len=%d, index=%d, flags=%d\n",
1211                    cname, clen, idx, flags);
1212         if (!cname[0] && (clen == buflen)) {
1213             CAPI_trace(ctx, "Enumerate bug: using workaround\n");
1214             goto done;
1215         }
1216         BIO_printf(out, "%d. %s\n", idx, cname);
1217     }
1218  err:
1219 
1220     ret = 0;
1221 
1222  done:
1223     if (cname)
1224         OPENSSL_free(cname);
1225     CryptReleaseContext(hprov, 0);
1226 
1227     return ret;
1228 }
1229 
1230 CRYPT_KEY_PROV_INFO *capi_get_prov_info(CAPI_CTX * ctx, PCCERT_CONTEXT cert)
1231 {
1232     DWORD len;
1233     CRYPT_KEY_PROV_INFO *pinfo;
1234 
1235     if (!CertGetCertificateContextProperty
1236         (cert, CERT_KEY_PROV_INFO_PROP_ID, NULL, &len))
1237         return NULL;
1238     pinfo = OPENSSL_malloc(len);
1239     if (!pinfo) {
1240         CAPIerr(CAPI_F_CAPI_GET_PROV_INFO, ERR_R_MALLOC_FAILURE);
1241         return NULL;
1242     }
1243     if (!CertGetCertificateContextProperty
1244         (cert, CERT_KEY_PROV_INFO_PROP_ID, pinfo, &len)) {
1245         CAPIerr(CAPI_F_CAPI_GET_PROV_INFO,
1246                 CAPI_R_ERROR_GETTING_KEY_PROVIDER_INFO);
1247         capi_addlasterror();
1248         OPENSSL_free(pinfo);
1249         return NULL;
1250     }
1251     return pinfo;
1252 }
1253 
1254 static void capi_dump_prov_info(CAPI_CTX * ctx, BIO *out,
1255                                 CRYPT_KEY_PROV_INFO * pinfo)
1256 {
1257     char *provname = NULL, *contname = NULL;
1258     if (!pinfo) {
1259         BIO_printf(out, "  No Private Key\n");
1260         return;
1261     }
1262     provname = wide_to_asc(pinfo->pwszProvName);
1263     contname = wide_to_asc(pinfo->pwszContainerName);
1264     if (!provname || !contname)
1265         goto err;
1266 
1267     BIO_printf(out, "  Private Key Info:\n");
1268     BIO_printf(out, "    Provider Name:  %s, Provider Type %d\n", provname,
1269                pinfo->dwProvType);
1270     BIO_printf(out, "    Container Name: %s, Key Type %d\n", contname,
1271                pinfo->dwKeySpec);
1272  err:
1273     if (provname)
1274         OPENSSL_free(provname);
1275     if (contname)
1276         OPENSSL_free(contname);
1277 }
1278 
1279 char *capi_cert_get_fname(CAPI_CTX * ctx, PCCERT_CONTEXT cert)
1280 {
1281     LPWSTR wfname;
1282     DWORD dlen;
1283 
1284     CAPI_trace(ctx, "capi_cert_get_fname\n");
1285     if (!CertGetCertificateContextProperty
1286         (cert, CERT_FRIENDLY_NAME_PROP_ID, NULL, &dlen))
1287         return NULL;
1288     wfname = OPENSSL_malloc(dlen);
1289     if (CertGetCertificateContextProperty
1290         (cert, CERT_FRIENDLY_NAME_PROP_ID, wfname, &dlen)) {
1291         char *fname = wide_to_asc(wfname);
1292         OPENSSL_free(wfname);
1293         return fname;
1294     }
1295     CAPIerr(CAPI_F_CAPI_CERT_GET_FNAME, CAPI_R_ERROR_GETTING_FRIENDLY_NAME);
1296     capi_addlasterror();
1297 
1298     OPENSSL_free(wfname);
1299     return NULL;
1300 }
1301 
1302 void capi_dump_cert(CAPI_CTX * ctx, BIO *out, PCCERT_CONTEXT cert)
1303 {
1304     X509 *x;
1305     unsigned char *p;
1306     unsigned long flags = ctx->dump_flags;
1307     if (flags & CAPI_DMP_FNAME) {
1308         char *fname;
1309         fname = capi_cert_get_fname(ctx, cert);
1310         if (fname) {
1311             BIO_printf(out, "  Friendly Name \"%s\"\n", fname);
1312             OPENSSL_free(fname);
1313         } else
1314             BIO_printf(out, "  <No Friendly Name>\n");
1315     }
1316 
1317     p = cert->pbCertEncoded;
1318     x = d2i_X509(NULL, &p, cert->cbCertEncoded);
1319     if (!x)
1320         BIO_printf(out, "  <Can't parse certificate>\n");
1321     if (flags & CAPI_DMP_SUMMARY) {
1322         BIO_printf(out, "  Subject: ");
1323         X509_NAME_print_ex(out, X509_get_subject_name(x), 0, XN_FLAG_ONELINE);
1324         BIO_printf(out, "\n  Issuer: ");
1325         X509_NAME_print_ex(out, X509_get_issuer_name(x), 0, XN_FLAG_ONELINE);
1326         BIO_printf(out, "\n");
1327     }
1328     if (flags & CAPI_DMP_FULL)
1329         X509_print_ex(out, x, XN_FLAG_ONELINE, 0);
1330 
1331     if (flags & CAPI_DMP_PKEYINFO) {
1332         CRYPT_KEY_PROV_INFO *pinfo;
1333         pinfo = capi_get_prov_info(ctx, cert);
1334         capi_dump_prov_info(ctx, out, pinfo);
1335         if (pinfo)
1336             OPENSSL_free(pinfo);
1337     }
1338 
1339     if (flags & CAPI_DMP_PEM)
1340         PEM_write_bio_X509(out, x);
1341     X509_free(x);
1342 }
1343 
1344 HCERTSTORE capi_open_store(CAPI_CTX * ctx, char *storename)
1345 {
1346     HCERTSTORE hstore;
1347 
1348     if (!storename)
1349         storename = ctx->storename;
1350     if (!storename)
1351         storename = "MY";
1352     CAPI_trace(ctx, "Opening certificate store %s\n", storename);
1353 
1354     hstore = CertOpenStore(CERT_STORE_PROV_SYSTEM_A, 0, 0,
1355                            ctx->store_flags, storename);
1356     if (!hstore) {
1357         CAPIerr(CAPI_F_CAPI_OPEN_STORE, CAPI_R_ERROR_OPENING_STORE);
1358         capi_addlasterror();
1359     }
1360     return hstore;
1361 }
1362 
1363 int capi_list_certs(CAPI_CTX * ctx, BIO *out, char *id)
1364 {
1365     char *storename;
1366     int idx;
1367     int ret = 1;
1368     HCERTSTORE hstore;
1369     PCCERT_CONTEXT cert = NULL;
1370 
1371     storename = ctx->storename;
1372     if (!storename)
1373         storename = "MY";
1374     CAPI_trace(ctx, "Listing certs for store %s\n", storename);
1375 
1376     hstore = capi_open_store(ctx, storename);
1377     if (!hstore)
1378         return 0;
1379     if (id) {
1380         cert = capi_find_cert(ctx, id, hstore);
1381         if (!cert) {
1382             ret = 0;
1383             goto err;
1384         }
1385         capi_dump_cert(ctx, out, cert);
1386         CertFreeCertificateContext(cert);
1387     } else {
1388         for (idx = 0;; idx++) {
1389             cert = CertEnumCertificatesInStore(hstore, cert);
1390             if (!cert)
1391                 break;
1392             BIO_printf(out, "Certificate %d\n", idx);
1393             capi_dump_cert(ctx, out, cert);
1394         }
1395     }
1396  err:
1397     CertCloseStore(hstore, 0);
1398     return ret;
1399 }
1400 
1401 static PCCERT_CONTEXT capi_find_cert(CAPI_CTX * ctx, const char *id,
1402                                      HCERTSTORE hstore)
1403 {
1404     PCCERT_CONTEXT cert = NULL;
1405     char *fname = NULL;
1406     int match;
1407     switch (ctx->lookup_method) {
1408     case CAPI_LU_SUBSTR:
1409         return CertFindCertificateInStore(hstore,
1410                                           X509_ASN_ENCODING, 0,
1411                                           CERT_FIND_SUBJECT_STR_A, id, NULL);
1412     case CAPI_LU_FNAME:
1413         for (;;) {
1414             cert = CertEnumCertificatesInStore(hstore, cert);
1415             if (!cert)
1416                 return NULL;
1417             fname = capi_cert_get_fname(ctx, cert);
1418             if (fname) {
1419                 if (strcmp(fname, id))
1420                     match = 0;
1421                 else
1422                     match = 1;
1423                 OPENSSL_free(fname);
1424                 if (match)
1425                     return cert;
1426             }
1427         }
1428     default:
1429         return NULL;
1430     }
1431 }
1432 
1433 static CAPI_KEY *capi_get_key(CAPI_CTX * ctx, const TCHAR *contname,
1434                               TCHAR *provname, DWORD ptype, DWORD keyspec)
1435 {
1436     CAPI_KEY *key;
1437     DWORD dwFlags = 0;
1438     key = OPENSSL_malloc(sizeof(CAPI_KEY));
1439     if (sizeof(TCHAR) == sizeof(char))
1440         CAPI_trace(ctx, "capi_get_key, contname=%s, provname=%s, type=%d\n",
1441                    contname, provname, ptype);
1442     else if (ctx && ctx->debug_level >= CAPI_DBG_TRACE && ctx->debug_file) {
1443         /* above 'if' is optimization to minimize malloc-ations */
1444         char *_contname = wide_to_asc((WCHAR *)contname);
1445         char *_provname = wide_to_asc((WCHAR *)provname);
1446 
1447         CAPI_trace(ctx, "capi_get_key, contname=%s, provname=%s, type=%d\n",
1448                    _contname, _provname, ptype);
1449         if (_provname)
1450             OPENSSL_free(_provname);
1451         if (_contname)
1452             OPENSSL_free(_contname);
1453     }
1454     if (ctx->store_flags & CERT_SYSTEM_STORE_LOCAL_MACHINE)
1455         dwFlags = CRYPT_MACHINE_KEYSET;
1456     if (!CryptAcquireContext(&key->hprov, contname, provname, ptype, dwFlags)) {
1457         CAPIerr(CAPI_F_CAPI_GET_KEY, CAPI_R_CRYPTACQUIRECONTEXT_ERROR);
1458         capi_addlasterror();
1459         goto err;
1460     }
1461     if (!CryptGetUserKey(key->hprov, keyspec, &key->key)) {
1462         CAPIerr(CAPI_F_CAPI_GET_KEY, CAPI_R_GETUSERKEY_ERROR);
1463         capi_addlasterror();
1464         CryptReleaseContext(key->hprov, 0);
1465         goto err;
1466     }
1467     key->keyspec = keyspec;
1468     key->pcert = NULL;
1469     return key;
1470 
1471  err:
1472     OPENSSL_free(key);
1473     return NULL;
1474 }
1475 
1476 static CAPI_KEY *capi_get_cert_key(CAPI_CTX * ctx, PCCERT_CONTEXT cert)
1477 {
1478     CAPI_KEY *key = NULL;
1479     CRYPT_KEY_PROV_INFO *pinfo = NULL;
1480     char *provname = NULL, *contname = NULL;
1481     pinfo = capi_get_prov_info(ctx, cert);
1482     if (!pinfo)
1483         goto err;
1484     if (sizeof(TCHAR) != sizeof(char))
1485         key = capi_get_key(ctx, (TCHAR *)pinfo->pwszContainerName,
1486                            (TCHAR *)pinfo->pwszProvName,
1487                            pinfo->dwProvType, pinfo->dwKeySpec);
1488     else {
1489         provname = wide_to_asc(pinfo->pwszProvName);
1490         contname = wide_to_asc(pinfo->pwszContainerName);
1491         if (!provname || !contname)
1492             goto err;
1493         key = capi_get_key(ctx, (TCHAR *)contname, (TCHAR *)provname,
1494                            pinfo->dwProvType, pinfo->dwKeySpec);
1495     }
1496 
1497  err:
1498     if (pinfo)
1499         OPENSSL_free(pinfo);
1500     if (provname)
1501         OPENSSL_free(provname);
1502     if (contname)
1503         OPENSSL_free(contname);
1504     return key;
1505 }
1506 
1507 CAPI_KEY *capi_find_key(CAPI_CTX * ctx, const char *id)
1508 {
1509     PCCERT_CONTEXT cert;
1510     HCERTSTORE hstore;
1511     CAPI_KEY *key = NULL;
1512     switch (ctx->lookup_method) {
1513     case CAPI_LU_SUBSTR:
1514     case CAPI_LU_FNAME:
1515         hstore = capi_open_store(ctx, NULL);
1516         if (!hstore)
1517             return NULL;
1518         cert = capi_find_cert(ctx, id, hstore);
1519         if (cert) {
1520             key = capi_get_cert_key(ctx, cert);
1521             CertFreeCertificateContext(cert);
1522         }
1523         CertCloseStore(hstore, 0);
1524         break;
1525 
1526     case CAPI_LU_CONTNAME:
1527         if (sizeof(TCHAR) != sizeof(char)) {
1528             WCHAR *contname, *provname;
1529             DWORD len;
1530 
1531             if ((len = MultiByteToWideChar(CP_ACP, 0, id, -1, NULL, 0)) &&
1532                 (contname = alloca(len * sizeof(WCHAR)),
1533                  MultiByteToWideChar(CP_ACP, 0, id, -1, contname, len)) &&
1534                 (len =
1535                  MultiByteToWideChar(CP_ACP, 0, ctx->cspname, -1, NULL, 0))
1536                 && (provname =
1537                     alloca(len * sizeof(WCHAR)), MultiByteToWideChar(CP_ACP,
1538                                                                      0,
1539                                                                      ctx->cspname,
1540                                                                      -1,
1541                                                                      provname,
1542                                                                      len)))
1543                 key =
1544                     capi_get_key(ctx, (TCHAR *)contname, (TCHAR *)provname,
1545                                  ctx->csptype, ctx->keytype);
1546         } else
1547             key = capi_get_key(ctx, (TCHAR *)id,
1548                                (TCHAR *)ctx->cspname,
1549                                ctx->csptype, ctx->keytype);
1550         break;
1551     }
1552 
1553     return key;
1554 }
1555 
1556 void capi_free_key(CAPI_KEY * key)
1557 {
1558     if (!key)
1559         return;
1560     CryptDestroyKey(key->key);
1561     CryptReleaseContext(key->hprov, 0);
1562     if (key->pcert)
1563         CertFreeCertificateContext(key->pcert);
1564     OPENSSL_free(key);
1565 }
1566 
1567 /* Initialize a CAPI_CTX structure */
1568 
1569 static CAPI_CTX *capi_ctx_new()
1570 {
1571     CAPI_CTX *ctx;
1572     ctx = OPENSSL_malloc(sizeof(CAPI_CTX));
1573     if (!ctx) {
1574         CAPIerr(CAPI_F_CAPI_CTX_NEW, ERR_R_MALLOC_FAILURE);
1575         return NULL;
1576     }
1577     ctx->cspname = NULL;
1578     ctx->csptype = PROV_RSA_FULL;
1579     ctx->dump_flags = CAPI_DMP_SUMMARY | CAPI_DMP_FNAME;
1580     ctx->keytype = AT_KEYEXCHANGE;
1581     ctx->storename = NULL;
1582     ctx->ssl_client_store = NULL;
1583     ctx->store_flags = CERT_STORE_OPEN_EXISTING_FLAG |
1584         CERT_STORE_READONLY_FLAG | CERT_SYSTEM_STORE_CURRENT_USER;
1585     ctx->lookup_method = CAPI_LU_SUBSTR;
1586     ctx->debug_level = 0;
1587     ctx->debug_file = NULL;
1588     ctx->client_cert_select = cert_select_simple;
1589     return ctx;
1590 }
1591 
1592 static void capi_ctx_free(CAPI_CTX * ctx)
1593 {
1594     CAPI_trace(ctx, "Calling capi_ctx_free with %lx\n", ctx);
1595     if (!ctx)
1596         return;
1597     if (ctx->cspname)
1598         OPENSSL_free(ctx->cspname);
1599     if (ctx->debug_file)
1600         OPENSSL_free(ctx->debug_file);
1601     if (ctx->storename)
1602         OPENSSL_free(ctx->storename);
1603     if (ctx->ssl_client_store)
1604         OPENSSL_free(ctx->ssl_client_store);
1605     OPENSSL_free(ctx);
1606 }
1607 
1608 static int capi_ctx_set_provname(CAPI_CTX * ctx, LPSTR pname, DWORD type,
1609                                  int check)
1610 {
1611     CAPI_trace(ctx, "capi_ctx_set_provname, name=%s, type=%d\n", pname, type);
1612     if (check) {
1613         HCRYPTPROV hprov;
1614         LPTSTR name = NULL;
1615 
1616         if (sizeof(TCHAR) != sizeof(char)) {
1617             DWORD len;
1618             if ((len = MultiByteToWideChar(CP_ACP, 0, pname, -1, NULL, 0))) {
1619                 name = alloca(len * sizeof(WCHAR));
1620                 MultiByteToWideChar(CP_ACP, 0, pname, -1, (WCHAR *)name, len);
1621             }
1622         } else
1623             name = (TCHAR *)pname;
1624 
1625         if (!name || !CryptAcquireContext(&hprov, NULL, name, type,
1626                                           CRYPT_VERIFYCONTEXT)) {
1627             CAPIerr(CAPI_F_CAPI_CTX_SET_PROVNAME,
1628                     CAPI_R_CRYPTACQUIRECONTEXT_ERROR);
1629             capi_addlasterror();
1630             return 0;
1631         }
1632         CryptReleaseContext(hprov, 0);
1633     }
1634     if (ctx->cspname)
1635         OPENSSL_free(ctx->cspname);
1636     ctx->cspname = BUF_strdup(pname);
1637     ctx->csptype = type;
1638     return 1;
1639 }
1640 
1641 static int capi_ctx_set_provname_idx(CAPI_CTX * ctx, int idx)
1642 {
1643     LPSTR pname;
1644     DWORD type;
1645     int res;
1646     if (capi_get_provname(ctx, &pname, &type, idx) != 1)
1647         return 0;
1648     res = capi_ctx_set_provname(ctx, pname, type, 0);
1649     OPENSSL_free(pname);
1650     return res;
1651 }
1652 
1653 static int cert_issuer_match(STACK_OF(X509_NAME) *ca_dn, X509 *x)
1654 {
1655     int i;
1656     X509_NAME *nm;
1657     /* Special case: empty list: match anything */
1658     if (sk_X509_NAME_num(ca_dn) <= 0)
1659         return 1;
1660     for (i = 0; i < sk_X509_NAME_num(ca_dn); i++) {
1661         nm = sk_X509_NAME_value(ca_dn, i);
1662         if (!X509_NAME_cmp(nm, X509_get_issuer_name(x)))
1663             return 1;
1664     }
1665     return 0;
1666 }
1667 
1668 static int capi_load_ssl_client_cert(ENGINE *e, SSL *ssl,
1669                                      STACK_OF(X509_NAME) *ca_dn, X509 **pcert,
1670                                      EVP_PKEY **pkey, STACK_OF(X509) **pother,
1671                                      UI_METHOD *ui_method,
1672                                      void *callback_data)
1673 {
1674     STACK_OF(X509) *certs = NULL;
1675     X509 *x;
1676     char *storename;
1677     const char *p;
1678     int i, client_cert_idx;
1679     HCERTSTORE hstore;
1680     PCCERT_CONTEXT cert = NULL, excert = NULL;
1681     CAPI_CTX *ctx;
1682     CAPI_KEY *key;
1683     ctx = ENGINE_get_ex_data(e, capi_idx);
1684 
1685     *pcert = NULL;
1686     *pkey = NULL;
1687 
1688     storename = ctx->ssl_client_store;
1689     if (!storename)
1690         storename = "MY";
1691 
1692     hstore = capi_open_store(ctx, storename);
1693     if (!hstore)
1694         return 0;
1695     /* Enumerate all certificates collect any matches */
1696     for (i = 0;; i++) {
1697         cert = CertEnumCertificatesInStore(hstore, cert);
1698         if (!cert)
1699             break;
1700         p = cert->pbCertEncoded;
1701         x = d2i_X509(NULL, &p, cert->cbCertEncoded);
1702         if (!x) {
1703             CAPI_trace(ctx, "Can't Parse Certificate %d\n", i);
1704             continue;
1705         }
1706         if (cert_issuer_match(ca_dn, x)
1707             && X509_check_purpose(x, X509_PURPOSE_SSL_CLIENT, 0)) {
1708             key = capi_get_cert_key(ctx, cert);
1709             if (!key) {
1710                 X509_free(x);
1711                 continue;
1712             }
1713             /*
1714              * Match found: attach extra data to it so we can retrieve the
1715              * key later.
1716              */
1717             excert = CertDuplicateCertificateContext(cert);
1718             key->pcert = excert;
1719             X509_set_ex_data(x, cert_capi_idx, key);
1720 
1721             if (!certs)
1722                 certs = sk_X509_new_null();
1723 
1724             sk_X509_push(certs, x);
1725         } else
1726             X509_free(x);
1727 
1728     }
1729 
1730     if (cert)
1731         CertFreeCertificateContext(cert);
1732     if (hstore)
1733         CertCloseStore(hstore, 0);
1734 
1735     if (!certs)
1736         return 0;
1737 
1738     /* Select the appropriate certificate */
1739 
1740     client_cert_idx = ctx->client_cert_select(e, ssl, certs);
1741 
1742     /* Set the selected certificate and free the rest */
1743 
1744     for (i = 0; i < sk_X509_num(certs); i++) {
1745         x = sk_X509_value(certs, i);
1746         if (i == client_cert_idx)
1747             *pcert = x;
1748         else {
1749             key = X509_get_ex_data(x, cert_capi_idx);
1750             capi_free_key(key);
1751             X509_free(x);
1752         }
1753     }
1754 
1755     sk_X509_free(certs);
1756 
1757     if (!*pcert)
1758         return 0;
1759 
1760     /* Setup key for selected certificate */
1761 
1762     key = X509_get_ex_data(*pcert, cert_capi_idx);
1763     *pkey = capi_get_pkey(e, key);
1764     X509_set_ex_data(*pcert, cert_capi_idx, NULL);
1765 
1766     return 1;
1767 
1768 }
1769 
1770 /* Simple client cert selection function: always select first */
1771 
1772 static int cert_select_simple(ENGINE *e, SSL *ssl, STACK_OF(X509) *certs)
1773 {
1774     return 0;
1775 }
1776 
1777 # ifdef OPENSSL_CAPIENG_DIALOG
1778 
1779 /*
1780  * More complex cert selection function, using standard function
1781  * CryptUIDlgSelectCertificateFromStore() to produce a dialog box.
1782  */
1783 
1784 /*
1785  * Definitions which are in cryptuiapi.h but this is not present in older
1786  * versions of headers.
1787  */
1788 
1789 #  ifndef CRYPTUI_SELECT_LOCATION_COLUMN
1790 #   define CRYPTUI_SELECT_LOCATION_COLUMN                   0x000000010
1791 #   define CRYPTUI_SELECT_INTENDEDUSE_COLUMN                0x000000004
1792 #  endif
1793 
1794 #  define dlg_title L"OpenSSL Application SSL Client Certificate Selection"
1795 #  define dlg_prompt L"Select a certificate to use for authentication"
1796 #  define dlg_columns      CRYPTUI_SELECT_LOCATION_COLUMN \
1797                         |CRYPTUI_SELECT_INTENDEDUSE_COLUMN
1798 
1799 static int cert_select_dialog(ENGINE *e, SSL *ssl, STACK_OF(X509) *certs)
1800 {
1801     X509 *x;
1802     HCERTSTORE dstore;
1803     PCCERT_CONTEXT cert;
1804     CAPI_CTX *ctx;
1805     CAPI_KEY *key;
1806     HWND hwnd;
1807     int i, idx = -1;
1808     if (sk_X509_num(certs) == 1)
1809         return 0;
1810     ctx = ENGINE_get_ex_data(e, capi_idx);
1811     /* Create an in memory store of certificates */
1812     dstore = CertOpenStore(CERT_STORE_PROV_MEMORY, 0, 0,
1813                            CERT_STORE_CREATE_NEW_FLAG, NULL);
1814     if (!dstore) {
1815         CAPIerr(CAPI_F_CERT_SELECT_DIALOG, CAPI_R_ERROR_CREATING_STORE);
1816         capi_addlasterror();
1817         goto err;
1818     }
1819     /* Add all certificates to store */
1820     for (i = 0; i < sk_X509_num(certs); i++) {
1821         x = sk_X509_value(certs, i);
1822         key = X509_get_ex_data(x, cert_capi_idx);
1823 
1824         if (!CertAddCertificateContextToStore(dstore, key->pcert,
1825                                               CERT_STORE_ADD_NEW, NULL)) {
1826             CAPIerr(CAPI_F_CERT_SELECT_DIALOG, CAPI_R_ERROR_ADDING_CERT);
1827             capi_addlasterror();
1828             goto err;
1829         }
1830 
1831     }
1832     hwnd = GetForegroundWindow();
1833     if (!hwnd)
1834         hwnd = GetActiveWindow();
1835     if (!hwnd && ctx->getconswindow)
1836         hwnd = ctx->getconswindow();
1837     /* Call dialog to select one */
1838     cert = ctx->certselectdlg(dstore, hwnd, dlg_title, dlg_prompt,
1839                               dlg_columns, 0, NULL);
1840 
1841     /* Find matching cert from list */
1842     if (cert) {
1843         for (i = 0; i < sk_X509_num(certs); i++) {
1844             x = sk_X509_value(certs, i);
1845             key = X509_get_ex_data(x, cert_capi_idx);
1846             if (CertCompareCertificate
1847                 (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, cert->pCertInfo,
1848                  key->pcert->pCertInfo)) {
1849                 idx = i;
1850                 break;
1851             }
1852         }
1853     }
1854 
1855  err:
1856     if (dstore)
1857         CertCloseStore(dstore, 0);
1858     return idx;
1859 
1860 }
1861 # endif
1862 
1863 #else                           /* !__COMPILE_CAPIENG */
1864 # include <openssl/engine.h>
1865 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
1866 OPENSSL_EXPORT
1867     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
1868 OPENSSL_EXPORT
1869     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
1870 {
1871     return 0;
1872 }
1873 
1874 IMPLEMENT_DYNAMIC_CHECK_FN()
1875 # else
1876 void ENGINE_load_capi(void)
1877 {
1878 }
1879 # endif
1880 #endif
1881