crypto/store/loader_file.c

   1 /*
   2  * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11
  12 #include <openssl/bio.h>
  13 #include <openssl/dsa.h>         /* For d2i_DSAPrivateKey */
  14 #include <openssl/err.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/pem.h>
  17 #include <openssl/pkcs12.h>      /* For the PKCS8 stuff o.O */
  18 #include <openssl/rsa.h>         /* For d2i_RSAPrivateKey */
  19 #include <openssl/safestack.h>
  20 #include <openssl/store.h>
  21 #include <openssl/ui.h>
  22 #include <openssl/x509.h>        /* For the PKCS8 stuff o.O */
  23 #include "internal/asn1_int.h"
  24 #include "store_locl.h"
  25
  26 #include "e_os.h"
  27
  28 /*
  29  *  Password prompting
  30  */
  31
  32 static char *file_get_pass(const UI_METHOD *ui_method, char *pass,
  33                            size_t maxsize, const char *prompt_info, void *data)
  34 {
  35     UI *ui = UI_new();
  36     char *prompt = NULL;
  37
  38     if (ui == NULL) {
  39         OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_MALLOC_FAILURE);
  40         return NULL;
  41     }
  42
  43     if (ui_method != NULL)
  44         UI_set_method(ui, ui_method);
  45     UI_add_user_data(ui, data);
  46
  47     if ((prompt = UI_construct_prompt(ui, "pass phrase",
  48                                       prompt_info)) == NULL) {
  49         OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_MALLOC_FAILURE);
  50         pass = NULL;
  51     } else if (!UI_add_input_string(ui, prompt, UI_INPUT_FLAG_DEFAULT_PWD,
  52                                     pass, 0, maxsize - 1)) {
  53         OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_UI_LIB);
  54         pass = NULL;
  55     } else {
  56         switch (UI_process(ui)) {
  57         case -2:
  58             OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS,
  59                           OSSL_STORE_R_UI_PROCESS_INTERRUPTED_OR_CANCELLED);
  60             pass = NULL;
  61             break;
  62         case -1:
  63             OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_UI_LIB);
  64             pass = NULL;
  65             break;
  66         default:
  67             break;
  68         }
  69     }
  70
  71     OPENSSL_free(prompt);
  72     UI_free(ui);
  73     return pass;
  74 }
  75
  76 struct pem_pass_data {
  77     const UI_METHOD *ui_method;
  78     void *data;
  79     const char *prompt_info;
  80 };
  81 static int file_fill_pem_pass_data(struct pem_pass_data *pass_data,
  82                                    const char *prompt_info,
  83                                    const UI_METHOD *ui_method, void *ui_data)
  84 {
  85     if (pass_data == NULL)
  86         return 0;
  87     pass_data->ui_method = ui_method;
  88     pass_data->data = ui_data;
  89     pass_data->prompt_info = prompt_info;
  90     return 1;
  91 }
  92 static int file_get_pem_pass(char *buf, int num, int w, void *data)
  93 {
  94     struct pem_pass_data *pass_data = data;
  95     char *pass = file_get_pass(pass_data->ui_method, buf, num,
  96                                pass_data->prompt_info, pass_data->data);
  97
  98     return pass == NULL ? 0 : strlen(pass);
  99 }
 100
 101 /*
 102  *  The file scheme handlers
 103  */
 104
 105 /*-
 106  * The try_decode function is called to check if the blob of data can
 107  * be used by this handler, and if it can, decodes it into a supported
 108  * OpenSSL type and returns a OSSL_STORE_INFO with the decoded data.
 109  * Input:
 110  *    pem_name:     If this blob comes from a PEM file, this holds
 111  *                  the PEM name.  If it comes from another type of
 112  *                  file, this is NULL.
 113  *    pem_header:   If this blob comes from a PEM file, this holds
 114  *                  the PEM headers.  If it comes from another type of
 115  *                  file, this is NULL.
 116  *    blob:         The blob of data to match with what this handler
 117  *                  can use.
 118  *    len:          The length of the blob.
 119  *    handler_ctx:  For a handler marked repeatable, this pointer can
 120  *                  be used to create a context for the handler.  IT IS
 121  *                  THE HANDLER'S RESPONSIBILITY TO CREATE AND DESTROY
 122  *                  THIS CONTEXT APPROPRIATELY, i.e. create on first call
 123  *                  and destroy when about to return NULL.
 124  *    ui_method:    Application UI method for getting a password, pin
 125  *                  or any other interactive data.
 126  *    ui_data:      Application data to be passed to ui_method when
 127  *                  it's called.
 128  * Output:
 129  *    a OSSL_STORE_INFO
 130  */
 131 typedef OSSL_STORE_INFO *(*file_try_decode_fn)(const char *pem_name,
 132                                                const char *pem_header,
 133                                                const unsigned char *blob,
 134                                                size_t len, void **handler_ctx,
 135                                                const UI_METHOD *ui_method,
 136                                                void *ui_data);
 137 /*
 138  * The eof function should return 1 if there's no more data to be found
 139  * with the handler_ctx, otherwise 0.  This is only used when the handler is
 140  * marked repeatable.
 141  */
 142 typedef int (*file_eof_fn)(void *handler_ctx);
 143 /*
 144  * The destroy_ctx function is used to destroy the handler_ctx that was
 145  * intiated by a repeatable try_decode fuction.  This is only used when
 146  * the handler is marked repeatable.
 147  */
 148 typedef void (*file_destroy_ctx_fn)(void **handler_ctx);
 149
 150 typedef struct file_handler_st {
 151     const char *name;
 152     file_try_decode_fn try_decode;
 153     file_eof_fn eof;
 154     file_destroy_ctx_fn destroy_ctx;
 155
 156     /* flags */
 157     int repeatable;
 158 } FILE_HANDLER;
 159
 160 static OSSL_STORE_INFO *try_decode_PKCS12(const char *pem_name,
 161                                           const char *pem_header,
 162                                           const unsigned char *blob,
 163                                           size_t len, void **pctx,
 164                                           const UI_METHOD *ui_method,
 165                                           void *ui_data)
 166 {
 167     OSSL_STORE_INFO *store_info = NULL;
 168     STACK_OF(OSSL_STORE_INFO) *ctx = *pctx;
 169
 170     if (ctx == NULL) {
 171         /* Initial parsing */
 172         PKCS12 *p12;
 173         int ok = 0;
 174
 175         if (pem_name != NULL)
 176             /* No match, there is no PEM PKCS12 tag */
 177             return NULL;
 178
 179         if ((p12 = d2i_PKCS12(NULL, &blob, len)) != NULL) {
 180             char *pass = NULL;
 181             char tpass[PEM_BUFSIZE];
 182             EVP_PKEY *pkey = NULL;
 183             X509 *cert = NULL;
 184             STACK_OF(X509) *chain = NULL;
 185
 186             if (PKCS12_verify_mac(p12, "", 0)
 187                 || PKCS12_verify_mac(p12, NULL, 0)) {
 188                 pass = "";
 189             } else {
 190                 if ((pass = file_get_pass(ui_method, tpass, PEM_BUFSIZE,
 191                                           "PKCS12 import password",
 192                                           ui_data)) == NULL) {
 193                     OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS12,
 194                                   OSSL_STORE_R_PASSPHRASE_CALLBACK_ERROR);
 195                     goto p12_end;
 196                 }
 197                 if (!PKCS12_verify_mac(p12, pass, strlen(pass))) {
 198                     OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS12,
 199                                   OSSL_STORE_R_ERROR_VERIFYING_PKCS12_MAC);
 200                     goto p12_end;
 201                 }
 202             }
 203
 204             if (PKCS12_parse(p12, pass, &pkey, &cert, &chain)) {
 205                 OSSL_STORE_INFO *si_pkey = NULL;
 206                 OSSL_STORE_INFO *si_cert = NULL;
 207                 OSSL_STORE_INFO *si_ca = NULL;
 208
 209                 if ((ctx = sk_OSSL_STORE_INFO_new_null()) != NULL
 210                     && (si_pkey = OSSL_STORE_INFO_new_PKEY(pkey)) != NULL
 211                     && sk_OSSL_STORE_INFO_push(ctx, si_pkey) != 0
 212                     && (si_cert = OSSL_STORE_INFO_new_CERT(cert)) != NULL
 213                     && sk_OSSL_STORE_INFO_push(ctx, si_cert) != 0) {
 214                     ok = 1;
 215                     si_pkey = NULL;
 216                     si_cert = NULL;
 217
 218                     while(sk_X509_num(chain) > 0) {
 219                         X509 *ca = sk_X509_value(chain, 0);
 220
 221                         if ((si_ca = OSSL_STORE_INFO_new_CERT(ca)) == NULL
 222                             || sk_OSSL_STORE_INFO_push(ctx, si_ca) == 0) {
 223                             ok = 0;
 224                             break;
 225                         }
 226                         si_ca = NULL;
 227                         (void)sk_X509_shift(chain);
 228                     }
 229                 }
 230                 if (!ok) {
 231                     OSSL_STORE_INFO_free(si_ca);
 232                     OSSL_STORE_INFO_free(si_cert);
 233                     OSSL_STORE_INFO_free(si_pkey);
 234                     sk_OSSL_STORE_INFO_pop_free(ctx, OSSL_STORE_INFO_free);
 235                     EVP_PKEY_free(pkey);
 236                     X509_free(cert);
 237                     sk_X509_pop_free(chain, X509_free);
 238                     ctx = NULL;
 239                 }
 240                 *pctx = ctx;
 241             }
 242         }
 243      p12_end:
 244         PKCS12_free(p12);
 245         if (!ok)
 246             return NULL;
 247     }
 248
 249     if (ctx != NULL)
 250         store_info = sk_OSSL_STORE_INFO_shift(ctx);
 251
 252     return store_info;
 253 }
 254 static int eof_PKCS12(void *ctx_)
 255 {
 256     STACK_OF(OSSL_STORE_INFO) *ctx = ctx_;
 257
 258     return ctx == NULL || sk_OSSL_STORE_INFO_num(ctx) == 0;
 259 }
 260 static void destroy_ctx_PKCS12(void **pctx)
 261 {
 262     STACK_OF(OSSL_STORE_INFO) *ctx = *pctx;
 263
 264     sk_OSSL_STORE_INFO_pop_free(ctx, OSSL_STORE_INFO_free);
 265     *pctx = NULL;
 266 }
 267 static FILE_HANDLER PKCS12_handler = {
 268     "PKCS12",
 269     try_decode_PKCS12,
 270     eof_PKCS12,
 271     destroy_ctx_PKCS12,
 272     1                            /* repeatable */
 273 };
 274
 275 int pem_check_suffix(const char *pem_str, const char *suffix);
 276 static OSSL_STORE_INFO *try_decode_PrivateKey(const char *pem_name,
 277                                               const char *pem_header,
 278                                               const unsigned char *blob,
 279                                               size_t len, void **pctx,
 280                                               const UI_METHOD *ui_method,
 281                                               void *ui_data)
 282 {
 283     OSSL_STORE_INFO *store_info = NULL;
 284     EVP_PKEY *pkey = NULL;
 285     const EVP_PKEY_ASN1_METHOD *ameth = NULL;
 286
 287     if (pem_name != NULL) {
 288         int slen;
 289
 290         if ((slen = pem_check_suffix(pem_name, "PRIVATE KEY")) > 0
 291             && (ameth = EVP_PKEY_asn1_find_str(NULL, pem_name, slen)) != NULL)
 292             pkey = d2i_PrivateKey(ameth->pkey_id, NULL, &blob, len);
 293     } else {
 294         int i;
 295
 296         for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
 297             ameth = EVP_PKEY_asn1_get0(i);
 298             if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
 299                 continue;
 300             pkey = d2i_PrivateKey(ameth->pkey_id, NULL, &blob, len);
 301             if (pkey != NULL)
 302                 break;
 303         }
 304     }
 305     if (pkey == NULL)
 306         /* No match */
 307         return NULL;
 308
 309     store_info = OSSL_STORE_INFO_new_PKEY(pkey);
 310     if (store_info == NULL)
 311         EVP_PKEY_free(pkey);
 312
 313     return store_info;
 314 }
 315 static FILE_HANDLER PrivateKey_handler = {
 316     "PrivateKey",
 317     try_decode_PrivateKey
 318 };
 319
 320 static OSSL_STORE_INFO *try_decode_PUBKEY(const char *pem_name,
 321                                           const char *pem_header,
 322                                           const unsigned char *blob,
 323                                           size_t len, void **pctx,
 324                                           const UI_METHOD *ui_method,
 325                                           void *ui_data)
 326 {
 327     OSSL_STORE_INFO *store_info = NULL;
 328     EVP_PKEY *pkey = NULL;
 329
 330     if (pem_name != NULL && strcmp(pem_name, PEM_STRING_PUBLIC) != 0)
 331         /* No match */
 332         return NULL;
 333
 334     if ((pkey = d2i_PUBKEY(NULL, &blob, len)) != NULL)
 335         store_info = OSSL_STORE_INFO_new_PKEY(pkey);
 336
 337     return store_info;
 338 }
 339 static FILE_HANDLER PUBKEY_handler = {
 340     "PUBKEY",
 341     try_decode_PUBKEY
 342 };
 343
 344 static OSSL_STORE_INFO *try_decode_params(const char *pem_name,
 345                                           const char *pem_header,
 346                                           const unsigned char *blob,
 347                                           size_t len, void **pctx,
 348                                           const UI_METHOD *ui_method,
 349                                           void *ui_data)
 350 {
 351     OSSL_STORE_INFO *store_info = NULL;
 352     EVP_PKEY *pkey = EVP_PKEY_new();
 353     const EVP_PKEY_ASN1_METHOD *ameth = NULL;
 354     int ok = 0;
 355
 356     if (pkey == NULL) {
 357         OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PARAMS, ERR_R_EVP_LIB);
 358         return NULL;
 359     }
 360
 361     if (pem_name != NULL) {
 362         int slen;
 363
 364         if ((slen = pem_check_suffix(pem_name, "PARAMETERS")) > 0
 365             && EVP_PKEY_set_type_str(pkey, pem_name, slen)
 366             && (ameth = EVP_PKEY_get0_asn1(pkey)) != NULL
 367             && ameth->param_decode != NULL
 368             && ameth->param_decode(pkey, &blob, len))
 369             ok = 1;
 370     } else {
 371         int i;
 372
 373         for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
 374             ameth = EVP_PKEY_asn1_get0(i);
 375             if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
 376                 continue;
 377             if (EVP_PKEY_set_type(pkey, ameth->pkey_id)
 378                 && (ameth = EVP_PKEY_get0_asn1(pkey)) != NULL
 379                 && ameth->param_decode != NULL
 380                 && ameth->param_decode(pkey, &blob, len)) {
 381                 ok = 1;
 382                 break;
 383             }
 384         }
 385     }
 386
 387     if (ok)
 388         store_info = OSSL_STORE_INFO_new_PARAMS(pkey);
 389     if (store_info == NULL)
 390         EVP_PKEY_free(pkey);
 391
 392     return store_info;
 393 }
 394 static FILE_HANDLER params_handler = {
 395     "params",
 396     try_decode_params
 397 };
 398
 399 static OSSL_STORE_INFO *try_decode_X509Certificate(const char *pem_name,
 400                                                    const char *pem_header,
 401                                                    const unsigned char *blob,
 402                                                    size_t len, void **pctx,
 403                                                    const UI_METHOD *ui_method,
 404                                                    void *ui_data)
 405 {
 406     OSSL_STORE_INFO *store_info = NULL;
 407     X509 *cert = NULL;
 408
 409     /*
 410      * In most cases, we can try to interpret the serialized data as a trusted
 411      * cert (X509 + X509_AUX) and fall back to reading it as a normal cert
 412      * (just X509), but if the PEM name specifically declares it as a trusted
 413      * cert, then no fallback should be engaged.  |ignore_trusted| tells if
 414      * the fallback can be used (1) or not (0).
 415      */
 416     int ignore_trusted = 1;
 417
 418     if (pem_name != NULL) {
 419         if (strcmp(pem_name, PEM_STRING_X509_TRUSTED) == 0)
 420             ignore_trusted = 0;
 421         else if (strcmp(pem_name, PEM_STRING_X509_OLD) != 0
 422                  && strcmp(pem_name, PEM_STRING_X509) != 0)
 423             /* No match */
 424             return NULL;
 425     }
 426
 427     if ((cert = d2i_X509_AUX(NULL, &blob, len)) != NULL
 428         || (ignore_trusted && (cert = d2i_X509(NULL, &blob, len)) != NULL))
 429         store_info = OSSL_STORE_INFO_new_CERT(cert);
 430
 431     if (store_info == NULL)
 432         X509_free(cert);
 433
 434     return store_info;
 435 }
 436 static FILE_HANDLER X509Certificate_handler = {
 437     "X509Certificate",
 438     try_decode_X509Certificate
 439 };
 440
 441 static OSSL_STORE_INFO *try_decode_X509CRL(const char *pem_name,
 442                                            const char *pem_header,
 443                                            const unsigned char *blob,
 444                                            size_t len, void **pctx,
 445                                            const UI_METHOD *ui_method,
 446                                            void *ui_data)
 447 {
 448     OSSL_STORE_INFO *store_info = NULL;
 449     X509_CRL *crl = NULL;
 450
 451     if (pem_name != NULL
 452         && strcmp(pem_name, PEM_STRING_X509_CRL) != 0)
 453         /* No match */
 454         return NULL;
 455
 456     if ((crl = d2i_X509_CRL(NULL, &blob, len)) != NULL)
 457         store_info = OSSL_STORE_INFO_new_CRL(crl);
 458
 459     if (store_info == NULL)
 460         X509_CRL_free(crl);
 461
 462     return store_info;
 463 }
 464 static FILE_HANDLER X509CRL_handler = {
 465     "X509CRL",
 466     try_decode_X509CRL
 467 };
 468
 469 static const FILE_HANDLER *file_handlers[] = {
 470     &PKCS12_handler,
 471     &X509Certificate_handler,
 472     &X509CRL_handler,
 473     &params_handler,
 474     &PUBKEY_handler,
 475     &PrivateKey_handler,
 476 };
 477
 478
 479 /*
 480  *  The loader itself
 481  */
 482
 483 struct ossl_store_loader_ctx_st {
 484     BIO *file;
 485     int is_pem;
 486     int errcnt;
 487
 488     /* The following are used when the handler is marked as repeatable */
 489     const FILE_HANDLER *last_handler;
 490     void *last_handler_ctx;
 491 };
 492
 493 static OSSL_STORE_LOADER_CTX *file_open(const OSSL_STORE_LOADER *loader,
 494                                         const char *uri,
 495                                         const UI_METHOD *ui_method,
 496                                         void *ui_data)
 497 {
 498     BIO *buff = NULL;
 499     char peekbuf[4096];
 500     OSSL_STORE_LOADER_CTX *ctx = NULL;
 501     const char *path = NULL;
 502
 503     if (strncasecmp(uri, "file:", 5) == 0) {
 504         if (strncmp(&uri[5], "//localhost/", 12) == 0) {
 505             path = &uri[16];
 506         } else if (strncmp(&uri[5], "///", 3) == 0) {
 507             path = &uri[7];
 508         } else if (strncmp(&uri[5], "//", 2) != 0) {
 509             path = &uri[5];
 510         } else {
 511             OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN,
 512                           OSSL_STORE_R_URI_AUTHORITY_UNSUPPORED);
 513             return NULL;
 514         }
 515
 516         /*
 517          * If the scheme "file" was an explicit part of the URI, the path must
 518          * be absolute.  So says RFC 8089
 519          */
 520         if (path[0] != '/') {
 521             OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN,
 522                           OSSL_STORE_R_PATH_MUST_BE_ABSOLUTE);
 523             return NULL;
 524         }
 525
 526 #ifdef _WIN32
 527         /* Windows file: URIs with a drive letter start with a / */
 528         if (path[0] == '/' && path[2] == ':' && path[3] == '/')
 529             path++;
 530 #endif
 531     } else {
 532         path = uri;
 533     }
 534
 535
 536     ctx = OPENSSL_zalloc(sizeof(*ctx));
 537     if (ctx == NULL) {
 538         OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN, ERR_R_MALLOC_FAILURE);
 539         return NULL;
 540     }
 541
 542     if ((buff = BIO_new(BIO_f_buffer())) == NULL)
 543         goto err;
 544     if ((ctx->file = BIO_new_file(path, "rb")) == NULL) {
 545         goto err;
 546     }
 547     ctx->file = BIO_push(buff, ctx->file);
 548     if (BIO_buffer_peek(ctx->file, peekbuf, sizeof(peekbuf)-1) > 0) {
 549         peekbuf[sizeof(peekbuf)-1] = '\0';
 550         if (strstr(peekbuf, "-----BEGIN ") != NULL)
 551             ctx->is_pem = 1;
 552     }
 553
 554     return ctx;
 555  err:
 556     if (buff != NULL)
 557         BIO_free(buff);
 558     OPENSSL_free(ctx);
 559     return NULL;
 560 }
 561
 562 static int file_eof(OSSL_STORE_LOADER_CTX *ctx);
 563 static int file_error(OSSL_STORE_LOADER_CTX *ctx);
 564 static OSSL_STORE_INFO *file_load(OSSL_STORE_LOADER_CTX *ctx,
 565                                   const UI_METHOD *ui_method, void *ui_data)
 566 {
 567     OSSL_STORE_INFO *result = NULL;
 568     int matchcount = -1;
 569
 570     if (ctx->last_handler != NULL) {
 571         result = ctx->last_handler->try_decode(NULL, NULL, NULL, 0,
 572                                                &ctx->last_handler_ctx,
 573                                                ui_method, ui_data);
 574
 575         if (result != NULL)
 576             return result;
 577
 578         ctx->last_handler->destroy_ctx(&ctx->last_handler_ctx);
 579         ctx->last_handler_ctx = NULL;
 580         ctx->last_handler = NULL;
 581     }
 582
 583     if (file_error(ctx))
 584         return NULL;
 585
 586     do {
 587         char *pem_name = NULL;      /* PEM record name */
 588         char *pem_header = NULL;    /* PEM record header */
 589         unsigned char *data = NULL; /* DER encoded data */
 590         BUF_MEM *mem = NULL;
 591         long len = 0;               /* DER encoded data length */
 592         int r = 0;
 593
 594         matchcount = -1;
 595         if (ctx->is_pem) {
 596             r = PEM_read_bio(ctx->file, &pem_name, &pem_header, &data, &len);
 597             if (r <= 0) {
 598                 if (!file_eof(ctx))
 599                     ctx->errcnt++;
 600                 goto end;
 601             }
 602
 603             /*
 604              * 10 is the number of characters in "Proc-Type:", which
 605              * PEM_get_EVP_CIPHER_INFO() requires to be present.
 606              * If the PEM header has less characters than that, it's
 607              * not worth spending cycles on it.
 608              */
 609             if (strlen(pem_header) > 10) {
 610                 EVP_CIPHER_INFO cipher;
 611                 struct pem_pass_data pass_data;
 612
 613                 if (!PEM_get_EVP_CIPHER_INFO(pem_header, &cipher)
 614                     || !file_fill_pem_pass_data(&pass_data, "PEM", ui_method,
 615                                                 ui_data)
 616                     || !PEM_do_header(&cipher, data, &len, file_get_pem_pass,
 617                                       &pass_data)) {
 618                     ctx->errcnt++;
 619                     goto err;
 620                 }
 621             }
 622         } else {
 623             if ((len = asn1_d2i_read_bio(ctx->file, &mem)) < 0) {
 624                 if (!file_eof(ctx))
 625                     ctx->errcnt++;
 626                 goto err;
 627             }
 628
 629             data = (unsigned char *)mem->data;
 630             len = (long)mem->length;
 631         }
 632
 633         result = NULL;
 634
 635         {
 636             size_t i = 0;
 637             void *handler_ctx = NULL;
 638             const FILE_HANDLER **matching_handlers =
 639                 OPENSSL_zalloc(sizeof(*matching_handlers)
 640                                * OSSL_NELEM(file_handlers));
 641
 642             if (matching_handlers == NULL) {
 643                 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD, ERR_R_MALLOC_FAILURE);
 644                 goto err;
 645             }
 646
 647             matchcount = 0;
 648             for (i = 0; i < OSSL_NELEM(file_handlers); i++) {
 649                 const FILE_HANDLER *handler = file_handlers[i];
 650                 void *tmp_handler_ctx = NULL;
 651                 OSSL_STORE_INFO *tmp_result =
 652                     handler->try_decode(pem_name, pem_header, data, len,
 653                                         &tmp_handler_ctx, ui_method, ui_data);
 654
 655                 if (tmp_result == NULL) {
 656                     OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD, OSSL_STORE_R_IS_NOT_A);
 657                     ERR_add_error_data(1, handler->name);
 658                 } else {
 659                     if (matching_handlers)
 660                         matching_handlers[matchcount] = handler;
 661
 662                     if (handler_ctx)
 663                         handler->destroy_ctx(&handler_ctx);
 664                     handler_ctx = tmp_handler_ctx;
 665
 666                     if (++matchcount == 1) {
 667                         result = tmp_result;
 668                         tmp_result = NULL;
 669                     } else {
 670                         /* more than one match => ambiguous, kill any result */
 671                         OSSL_STORE_INFO_free(result);
 672                         OSSL_STORE_INFO_free(tmp_result);
 673                         if (handler->destroy_ctx != NULL)
 674                             handler->destroy_ctx(&handler_ctx);
 675                         handler_ctx = NULL;
 676                         result = NULL;
 677                     }
 678                 }
 679             }
 680
 681             if (matchcount > 1)
 682                 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD,
 683                               OSSL_STORE_R_AMBIGUOUS_CONTENT_TYPE);
 684             if (matchcount == 0)
 685                 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD,
 686                               OSSL_STORE_R_UNSUPPORTED_CONTENT_TYPE);
 687             else if (matching_handlers[0]->repeatable) {
 688                 ctx->last_handler = matching_handlers[0];
 689                 ctx->last_handler_ctx = handler_ctx;
 690                 mem = NULL;
 691                 data = NULL;
 692             }
 693
 694             OPENSSL_free(matching_handlers);
 695         }
 696
 697         if (result)
 698             ERR_clear_error();
 699
 700      err:
 701         OPENSSL_free(pem_name);
 702         OPENSSL_free(pem_header);
 703         if (mem == NULL)
 704             OPENSSL_free(data);
 705         else
 706             BUF_MEM_free(mem);
 707     } while (matchcount == 0 && !file_eof(ctx) && !file_error(ctx));
 708
 709     /* We bail out on ambiguity */
 710     if (matchcount > 1)
 711         return NULL;
 712
 713  end:
 714     return result;
 715 }
 716
 717 static int file_error(OSSL_STORE_LOADER_CTX *ctx)
 718 {
 719     return ctx->errcnt > 0;
 720 }
 721
 722 static int file_eof(OSSL_STORE_LOADER_CTX *ctx)
 723 {
 724     if (ctx->last_handler != NULL
 725         && !ctx->last_handler->eof(ctx->last_handler_ctx))
 726         return 0;
 727     return BIO_eof(ctx->file);
 728 }
 729
 730 static int file_close(OSSL_STORE_LOADER_CTX *ctx)
 731 {
 732     if (ctx->last_handler != NULL) {
 733         ctx->last_handler->destroy_ctx(&ctx->last_handler_ctx);
 734         ctx->last_handler_ctx = NULL;
 735         ctx->last_handler = NULL;
 736     }
 737     BIO_free_all(ctx->file);
 738     OPENSSL_free(ctx);
 739     return 1;
 740 }
 741
 742 static OSSL_STORE_LOADER file_loader =
 743     {
 744         "file",
 745         file_open,
 746         NULL,
 747         file_load,
 748         file_eof,
 749         file_error,
 750         file_close
 751     };
 752
 753 static void store_file_loader_deinit(void)
 754 {
 755     ossl_store_unregister_loader_int(file_loader.scheme);
 756 }
 757
 758 int ossl_store_file_loader_init(void)
 759 {
 760     int ret = ossl_store_register_loader_int(&file_loader);
 761
 762     OPENSSL_atexit(store_file_loader_deinit);
 763     return ret;
 764 }