crypto/x509/v3_conf.c

   1 /*
   2  * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 /* extension creation utilities */
  11
  12 #include <stdio.h>
  13 #include "crypto/ctype.h"
  14 #include "internal/cryptlib.h"
  15 #include <openssl/conf.h>
  16 #include <openssl/x509.h>
  17 #include "crypto/x509.h"
  18 #include <openssl/x509v3.h>
  19
  20 static int v3_check_critical(const char **value);
  21 static int v3_check_generic(const char **value);
  22 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
  23                                     int crit, const char *value);
  24 static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
  25                                             int crit, int type,
  26                                             X509V3_CTX *ctx);
  27 static char *conf_lhash_get_string(void *db, const char *section, const char *value);
  28 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section);
  29 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
  30                                   int ext_nid, int crit, void *ext_struc);
  31 static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
  32                                    long *ext_len);
  33 /* CONF *conf:  Config file    */
  34 /* char *name:  Name    */
  35 /* char *value:  Value    */
  36 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
  37                                  const char *value)
  38 {
  39     int crit;
  40     int ext_type;
  41     X509_EXTENSION *ret;
  42     crit = v3_check_critical(&value);
  43     if ((ext_type = v3_check_generic(&value)))
  44         return v3_generic_extension(name, value, crit, ext_type, ctx);
  45     ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
  46     if (!ret) {
  47         X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION);
  48         ERR_add_error_data(4, "name=", name, ", value=", value);
  49     }
  50     return ret;
  51 }
  52
  53 /* CONF *conf:  Config file    */
  54 /* char *value:  Value    */
  55 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
  56                                      const char *value)
  57 {
  58     int crit;
  59     int ext_type;
  60     crit = v3_check_critical(&value);
  61     if ((ext_type = v3_check_generic(&value)))
  62         return v3_generic_extension(OBJ_nid2sn(ext_nid),
  63                                     value, crit, ext_type, ctx);
  64     return do_ext_nconf(conf, ctx, ext_nid, crit, value);
  65 }
  66
  67 /* CONF *conf:  Config file    */
  68 /* char *value:  Value    */
  69 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
  70                                     int crit, const char *value)
  71 {
  72     const X509V3_EXT_METHOD *method;
  73     X509_EXTENSION *ext;
  74     STACK_OF(CONF_VALUE) *nval;
  75     void *ext_struc;
  76
  77     if (ext_nid == NID_undef) {
  78         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
  79         return NULL;
  80     }
  81     if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
  82         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
  83         return NULL;
  84     }
  85     /* Now get internal extension representation based on type */
  86     if (method->v2i) {
  87         if (*value == '@')
  88             nval = NCONF_get_section(conf, value + 1);
  89         else
  90             nval = X509V3_parse_list(value);
  91         if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
  92             X509V3err(X509V3_F_DO_EXT_NCONF,
  93                       X509V3_R_INVALID_EXTENSION_STRING);
  94             ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
  95                                value);
  96             if (*value != '@')
  97                 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
  98             return NULL;
  99         }
 100         ext_struc = method->v2i(method, ctx, nval);
 101         if (*value != '@')
 102             sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
 103         if (!ext_struc)
 104             return NULL;
 105     } else if (method->s2i) {
 106         if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
 107             return NULL;
 108     } else if (method->r2i) {
 109         if (!ctx->db || !ctx->db_meth) {
 110             X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
 111             return NULL;
 112         }
 113         if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
 114             return NULL;
 115     } else {
 116         X509V3err(X509V3_F_DO_EXT_NCONF,
 117                   X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
 118         ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
 119         return NULL;
 120     }
 121
 122     ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
 123     if (method->it)
 124         ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
 125     else
 126         method->ext_free(ext_struc);
 127     return ext;
 128
 129 }
 130
 131 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
 132                                   int ext_nid, int crit, void *ext_struc)
 133 {
 134     unsigned char *ext_der = NULL;
 135     int ext_len;
 136     ASN1_OCTET_STRING *ext_oct = NULL;
 137     X509_EXTENSION *ext;
 138     /* Convert internal representation to DER */
 139     if (method->it) {
 140         ext_der = NULL;
 141         ext_len =
 142             ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
 143         if (ext_len < 0)
 144             goto merr;
 145     } else {
 146         unsigned char *p;
 147
 148         ext_len = method->i2d(ext_struc, NULL);
 149         if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
 150             goto merr;
 151         p = ext_der;
 152         method->i2d(ext_struc, &p);
 153     }
 154     if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL)
 155         goto merr;
 156     ext_oct->data = ext_der;
 157     ext_der = NULL;
 158     ext_oct->length = ext_len;
 159
 160     ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
 161     if (!ext)
 162         goto merr;
 163     ASN1_OCTET_STRING_free(ext_oct);
 164
 165     return ext;
 166
 167  merr:
 168     X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
 169     OPENSSL_free(ext_der);
 170     ASN1_OCTET_STRING_free(ext_oct);
 171     return NULL;
 172
 173 }
 174
 175 /* Given an internal structure, nid and critical flag create an extension */
 176
 177 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
 178 {
 179     const X509V3_EXT_METHOD *method;
 180
 181     if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
 182         X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
 183         return NULL;
 184     }
 185     return do_ext_i2d(method, ext_nid, crit, ext_struc);
 186 }
 187
 188 /* Check the extension string for critical flag */
 189 static int v3_check_critical(const char **value)
 190 {
 191     const char *p = *value;
 192     if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
 193         return 0;
 194     p += 9;
 195     while (ossl_isspace(*p))
 196         p++;
 197     *value = p;
 198     return 1;
 199 }
 200
 201 /* Check extension string for generic extension and return the type */
 202 static int v3_check_generic(const char **value)
 203 {
 204     int gen_type = 0;
 205     const char *p = *value;
 206     if ((strlen(p) >= 4) && strncmp(p, "DER:", 4) == 0) {
 207         p += 4;
 208         gen_type = 1;
 209     } else if ((strlen(p) >= 5) && strncmp(p, "ASN1:", 5) == 0) {
 210         p += 5;
 211         gen_type = 2;
 212     } else
 213         return 0;
 214
 215     while (ossl_isspace(*p))
 216         p++;
 217     *value = p;
 218     return gen_type;
 219 }
 220
 221 /* Create a generic extension: for now just handle DER type */
 222 static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
 223                                             int crit, int gen_type,
 224                                             X509V3_CTX *ctx)
 225 {
 226     unsigned char *ext_der = NULL;
 227     long ext_len = 0;
 228     ASN1_OBJECT *obj = NULL;
 229     ASN1_OCTET_STRING *oct = NULL;
 230     X509_EXTENSION *extension = NULL;
 231
 232     if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
 233         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 234                   X509V3_R_EXTENSION_NAME_ERROR);
 235         ERR_add_error_data(2, "name=", ext);
 236         goto err;
 237     }
 238
 239     if (gen_type == 1)
 240         ext_der = OPENSSL_hexstr2buf(value, &ext_len);
 241     else if (gen_type == 2)
 242         ext_der = generic_asn1(value, ctx, &ext_len);
 243
 244     if (ext_der == NULL) {
 245         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 246                   X509V3_R_EXTENSION_VALUE_ERROR);
 247         ERR_add_error_data(2, "value=", value);
 248         goto err;
 249     }
 250
 251     if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
 252         X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
 253         goto err;
 254     }
 255
 256     oct->data = ext_der;
 257     oct->length = ext_len;
 258     ext_der = NULL;
 259
 260     extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
 261
 262  err:
 263     ASN1_OBJECT_free(obj);
 264     ASN1_OCTET_STRING_free(oct);
 265     OPENSSL_free(ext_der);
 266     return extension;
 267
 268 }
 269
 270 static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
 271                                    long *ext_len)
 272 {
 273     ASN1_TYPE *typ;
 274     unsigned char *ext_der = NULL;
 275     typ = ASN1_generate_v3(value, ctx);
 276     if (typ == NULL)
 277         return NULL;
 278     *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
 279     ASN1_TYPE_free(typ);
 280     return ext_der;
 281 }
 282
 283 static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
 284 {
 285     int idx;
 286     ASN1_OBJECT *obj;
 287     obj = X509_EXTENSION_get_object(dext);
 288     while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
 289         X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
 290         X509v3_delete_ext(sk, idx);
 291         X509_EXTENSION_free(tmpext);
 292     }
 293 }
 294
 295 /*
 296  * This is the main function: add a bunch of extensions based on a config
 297  * file section to an extension STACK.
 298  */
 299
 300 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,
 301                             STACK_OF(X509_EXTENSION) **sk)
 302 {
 303     X509_EXTENSION *ext;
 304     STACK_OF(CONF_VALUE) *nval;
 305     CONF_VALUE *val;
 306     int i;
 307
 308     if ((nval = NCONF_get_section(conf, section)) == NULL)
 309         return 0;
 310     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 311         val = sk_CONF_VALUE_value(nval, i);
 312         if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL)
 313             return 0;
 314         if (ctx->flags == X509V3_CTX_REPLACE)
 315             delete_ext(*sk, ext);
 316         if (sk != NULL) {
 317             if (X509v3_add_ext(sk, ext, -1) == NULL) {
 318                 X509_EXTENSION_free(ext);
 319                 return 0;
 320             }
 321         }
 322         X509_EXTENSION_free(ext);
 323     }
 324     return 1;
 325 }
 326
 327 /*
 328  * Convenience functions to add extensions to a certificate, CRL and request
 329  */
 330
 331 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
 332                          X509 *cert)
 333 {
 334     STACK_OF(X509_EXTENSION) **sk = NULL;
 335     if (cert)
 336         sk = &cert->cert_info.extensions;
 337     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 338 }
 339
 340 /* Same as above but for a CRL */
 341
 342 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
 343                              X509_CRL *crl)
 344 {
 345     STACK_OF(X509_EXTENSION) **sk = NULL;
 346     if (crl)
 347         sk = &crl->crl.extensions;
 348     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 349 }
 350
 351 /* Add extensions to certificate request */
 352
 353 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
 354                              X509_REQ *req)
 355 {
 356     STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
 357     int i;
 358     if (req)
 359         sk = &extlist;
 360     i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 361     if (!i || !sk)
 362         return i;
 363     i = X509_REQ_add_extensions(req, extlist);
 364     sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
 365     return i;
 366 }
 367
 368 /* Config database functions */
 369
 370 char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)
 371 {
 372     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
 373         X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
 374         return NULL;
 375     }
 376     if (ctx->db_meth->get_string)
 377         return ctx->db_meth->get_string(ctx->db, name, section);
 378     return NULL;
 379 }
 380
 381 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section)
 382 {
 383     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
 384         X509V3err(X509V3_F_X509V3_GET_SECTION,
 385                   X509V3_R_OPERATION_NOT_DEFINED);
 386         return NULL;
 387     }
 388     if (ctx->db_meth->get_section)
 389         return ctx->db_meth->get_section(ctx->db, section);
 390     return NULL;
 391 }
 392
 393 void X509V3_string_free(X509V3_CTX *ctx, char *str)
 394 {
 395     if (!str)
 396         return;
 397     if (ctx->db_meth->free_string)
 398         ctx->db_meth->free_string(ctx->db, str);
 399 }
 400
 401 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
 402 {
 403     if (!section)
 404         return;
 405     if (ctx->db_meth->free_section)
 406         ctx->db_meth->free_section(ctx->db, section);
 407 }
 408
 409 static char *nconf_get_string(void *db, const char *section, const char *value)
 410 {
 411     return NCONF_get_string(db, section, value);
 412 }
 413
 414 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section)
 415 {
 416     return NCONF_get_section(db, section);
 417 }
 418
 419 static X509V3_CONF_METHOD nconf_method = {
 420     nconf_get_string,
 421     nconf_get_section,
 422     NULL,
 423     NULL
 424 };
 425
 426 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
 427 {
 428     ctx->db_meth = &nconf_method;
 429     ctx->db = conf;
 430 }
 431
 432 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
 433                     X509_CRL *crl, int flags)
 434 {
 435     ctx->issuer_cert = issuer;
 436     ctx->subject_cert = subj;
 437     ctx->crl = crl;
 438     ctx->subject_req = req;
 439     ctx->flags = flags;
 440 }
 441
 442 /* Old conf compatibility functions */
 443
 444 X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 445                                 const char *name, const char *value)
 446 {
 447     CONF ctmp;
 448     CONF_set_nconf(&ctmp, conf);
 449     return X509V3_EXT_nconf(&ctmp, ctx, name, value);
 450 }
 451
 452 /* LHASH *conf:  Config file    */
 453 /* char *value:  Value    */
 454 X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
 455                                     X509V3_CTX *ctx, int ext_nid, const char *value)
 456 {
 457     CONF ctmp;
 458     CONF_set_nconf(&ctmp, conf);
 459     return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
 460 }
 461
 462 static char *conf_lhash_get_string(void *db, const char *section, const char *value)
 463 {
 464     return CONF_get_string(db, section, value);
 465 }
 466
 467 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section)
 468 {
 469     return CONF_get_section(db, section);
 470 }
 471
 472 static X509V3_CONF_METHOD conf_lhash_method = {
 473     conf_lhash_get_string,
 474     conf_lhash_get_section,
 475     NULL,
 476     NULL
 477 };
 478
 479 void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
 480 {
 481     ctx->db_meth = &conf_lhash_method;
 482     ctx->db = lhash;
 483 }
 484
 485 int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 486                         const char *section, X509 *cert)
 487 {
 488     CONF ctmp;
 489     CONF_set_nconf(&ctmp, conf);
 490     return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
 491 }
 492
 493 /* Same as above but for a CRL */
 494
 495 int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 496                             const char *section, X509_CRL *crl)
 497 {
 498     CONF ctmp;
 499     CONF_set_nconf(&ctmp, conf);
 500     return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
 501 }
 502
 503 /* Add extensions to certificate request */
 504
 505 int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 506                             const char *section, X509_REQ *req)
 507 {
 508     CONF ctmp;
 509     CONF_set_nconf(&ctmp, conf);
 510     return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
 511 }