| // Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // extension creation utilities |
| |
| #include <ctype.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <openssl/conf.h> |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| #include <openssl/obj.h> |
| #include <openssl/x509.h> |
| |
| #include "../internal.h" |
| #include "internal.h" |
| |
| static int v3_check_critical(const char **value); |
| static int v3_check_generic(const char **value); |
| static X509_EXTENSION *do_ext_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| int ext_nid, int crit, const char *value); |
| static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value, |
| int crit, int type, |
| const X509V3_CTX *ctx); |
| static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, |
| int crit, void *ext_struc); |
| static unsigned char *generic_asn1(const char *value, const X509V3_CTX *ctx, |
| size_t *ext_len); |
| |
| X509_EXTENSION *X509V3_EXT_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| const char *name, const char *value) { |
| // If omitted, fill in an empty |X509V3_CTX|. |
| X509V3_CTX ctx_tmp; |
| if (ctx == NULL) { |
| X509V3_set_ctx(&ctx_tmp, NULL, NULL, NULL, NULL, 0); |
| X509V3_set_nconf(&ctx_tmp, conf); |
| ctx = &ctx_tmp; |
| } |
| |
| int crit = v3_check_critical(&value); |
| int ext_type = v3_check_generic(&value); |
| if (ext_type != 0) { |
| return v3_generic_extension(name, value, crit, ext_type, ctx); |
| } |
| X509_EXTENSION *ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); |
| if (!ret) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_IN_EXTENSION); |
| ERR_add_error_data(4, "name=", name, ", value=", value); |
| } |
| return ret; |
| } |
| |
| X509_EXTENSION *X509V3_EXT_nconf_nid(const CONF *conf, const X509V3_CTX *ctx, |
| int ext_nid, const char *value) { |
| // If omitted, fill in an empty |X509V3_CTX|. |
| X509V3_CTX ctx_tmp; |
| if (ctx == NULL) { |
| X509V3_set_ctx(&ctx_tmp, NULL, NULL, NULL, NULL, 0); |
| X509V3_set_nconf(&ctx_tmp, conf); |
| ctx = &ctx_tmp; |
| } |
| |
| int crit = v3_check_critical(&value); |
| int ext_type = v3_check_generic(&value); |
| if (ext_type != 0) { |
| return v3_generic_extension(OBJ_nid2sn(ext_nid), value, crit, ext_type, |
| ctx); |
| } |
| return do_ext_nconf(conf, ctx, ext_nid, crit, value); |
| } |
| |
| // CONF *conf: Config file |
| // char *value: Value |
| static X509_EXTENSION *do_ext_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| int ext_nid, int crit, const char *value) { |
| const X509V3_EXT_METHOD *method; |
| X509_EXTENSION *ext; |
| const STACK_OF(CONF_VALUE) *nval; |
| STACK_OF(CONF_VALUE) *nval_owned = NULL; |
| void *ext_struc; |
| if (ext_nid == NID_undef) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME); |
| return NULL; |
| } |
| if (!(method = X509V3_EXT_get_nid(ext_nid))) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); |
| return NULL; |
| } |
| // Now get internal extension representation based on type |
| if (method->v2i) { |
| if (*value == '@') { |
| // TODO(davidben): This is the only place where |X509V3_EXT_nconf|'s |
| // |conf| parameter is used. All other codepaths use the copy inside |
| // |ctx|. Should this be switched and then the parameter ignored? |
| if (conf == NULL) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE); |
| return NULL; |
| } |
| nval = NCONF_get_section(conf, value + 1); |
| } else { |
| nval_owned = X509V3_parse_list(value); |
| nval = nval_owned; |
| } |
| if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_EXTENSION_STRING); |
| ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value); |
| sk_CONF_VALUE_pop_free(nval_owned, X509V3_conf_free); |
| return NULL; |
| } |
| ext_struc = method->v2i(method, ctx, nval); |
| sk_CONF_VALUE_pop_free(nval_owned, X509V3_conf_free); |
| if (!ext_struc) { |
| return NULL; |
| } |
| } else if (method->s2i) { |
| if (!(ext_struc = method->s2i(method, ctx, value))) { |
| return NULL; |
| } |
| } else if (method->r2i) { |
| // TODO(davidben): Should this check be removed? This matches OpenSSL, but |
| // r2i-based extensions do not necessarily require a config database. The |
| // two built-in extensions only use it some of the time, and already handle |
| // |X509V3_get_section| returning NULL. |
| if (!ctx->db) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE); |
| return NULL; |
| } |
| if (!(ext_struc = method->r2i(method, ctx, value))) { |
| return NULL; |
| } |
| } else { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); |
| ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid)); |
| return NULL; |
| } |
| |
| ext = do_ext_i2d(method, ext_nid, crit, ext_struc); |
| ASN1_item_free(reinterpret_cast<ASN1_VALUE *>(ext_struc), |
| ASN1_ITEM_ptr(method->it)); |
| return ext; |
| } |
| |
| static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, |
| int crit, void *ext_struc) { |
| // Convert the extension's internal representation to DER. |
| unsigned char *ext_der = NULL; |
| int ext_len = ASN1_item_i2d(reinterpret_cast<ASN1_VALUE *>(ext_struc), |
| &ext_der, ASN1_ITEM_ptr(method->it)); |
| if (ext_len < 0) { |
| return NULL; |
| } |
| |
| ASN1_OCTET_STRING *ext_oct = ASN1_OCTET_STRING_new(); |
| if (ext_oct == NULL) { |
| OPENSSL_free(ext_der); |
| return NULL; |
| } |
| ASN1_STRING_set0(ext_oct, ext_der, ext_len); |
| |
| X509_EXTENSION *ext = |
| X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); |
| ASN1_OCTET_STRING_free(ext_oct); |
| return ext; |
| } |
| |
| // Given an internal structure, nid and critical flag create an extension |
| |
| X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) { |
| const X509V3_EXT_METHOD *method; |
| if (!(method = X509V3_EXT_get_nid(ext_nid))) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); |
| return NULL; |
| } |
| return do_ext_i2d(method, ext_nid, crit, ext_struc); |
| } |
| |
| // Check the extension string for critical flag |
| static int v3_check_critical(const char **value) { |
| const char *p = *value; |
| if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) { |
| return 0; |
| } |
| p += 9; |
| while (OPENSSL_isspace((unsigned char)*p)) { |
| p++; |
| } |
| *value = p; |
| return 1; |
| } |
| |
| // Check extension string for generic extension and return the type |
| static int v3_check_generic(const char **value) { |
| int gen_type = 0; |
| const char *p = *value; |
| if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) { |
| p += 4; |
| gen_type = 1; |
| } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) { |
| p += 5; |
| gen_type = 2; |
| } else { |
| return 0; |
| } |
| |
| while (OPENSSL_isspace((unsigned char)*p)) { |
| p++; |
| } |
| *value = p; |
| return gen_type; |
| } |
| |
| // Create a generic extension: for now just handle DER type |
| static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value, |
| int crit, int gen_type, |
| const X509V3_CTX *ctx) { |
| bssl::UniquePtr<ASN1_OBJECT> obj(OBJ_txt2obj(ext, 0)); |
| if (obj == nullptr) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NAME_ERROR); |
| ERR_add_error_data(2, "name=", ext); |
| return nullptr; |
| } |
| |
| bssl::UniquePtr<unsigned char> ext_der; |
| size_t ext_len = 0; |
| if (gen_type == 1) { |
| ext_der.reset(x509v3_hex_to_bytes(value, &ext_len)); |
| } else if (gen_type == 2) { |
| ext_der.reset(generic_asn1(value, ctx, &ext_len)); |
| } |
| |
| if (ext_der == nullptr) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_VALUE_ERROR); |
| ERR_add_error_data(2, "value=", value); |
| return nullptr; |
| } |
| |
| if (ext_len > INT_MAX) { |
| OPENSSL_PUT_ERROR(X509V3, ERR_R_OVERFLOW); |
| return nullptr; |
| } |
| |
| bssl::UniquePtr<ASN1_OCTET_STRING> oct(ASN1_OCTET_STRING_new()); |
| if (oct == nullptr) { |
| return nullptr; |
| } |
| |
| ASN1_STRING_set0(oct.get(), ext_der.get(), (int)ext_len); |
| ext_der.release(); // ASN1_STRING_set0 took ownership. |
| |
| return X509_EXTENSION_create_by_OBJ(nullptr, obj.get(), crit, oct.get()); |
| } |
| |
| static unsigned char *generic_asn1(const char *value, const X509V3_CTX *ctx, |
| size_t *ext_len) { |
| ASN1_TYPE *typ = ASN1_generate_v3(value, ctx); |
| if (typ == NULL) { |
| return NULL; |
| } |
| unsigned char *ext_der = NULL; |
| int len = i2d_ASN1_TYPE(typ, &ext_der); |
| ASN1_TYPE_free(typ); |
| if (len < 0) { |
| return NULL; |
| } |
| *ext_len = len; |
| return ext_der; |
| } |
| |
| // This is the main function: add a bunch of extensions based on a config |
| // file section to an extension STACK. |
| |
| int X509V3_EXT_add_nconf_sk(const CONF *conf, const X509V3_CTX *ctx, |
| const char *section, |
| STACK_OF(X509_EXTENSION) **sk) { |
| const STACK_OF(CONF_VALUE) *nval = NCONF_get_section(conf, section); |
| if (nval == NULL) { |
| return 0; |
| } |
| for (size_t i = 0; i < sk_CONF_VALUE_num(nval); i++) { |
| const CONF_VALUE *val = sk_CONF_VALUE_value(nval, i); |
| X509_EXTENSION *ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value); |
| int ok = ext != NULL && // |
| (sk == NULL || X509v3_add_ext(sk, ext, -1) != NULL); |
| X509_EXTENSION_free(ext); |
| if (!ok) { |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| // Convenience functions to add extensions to a certificate, CRL and request |
| |
| int X509V3_EXT_add_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| const char *section, X509 *cert) { |
| STACK_OF(X509_EXTENSION) **sk = NULL; |
| if (cert) { |
| sk = &cert->cert_info->extensions; |
| } |
| return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
| } |
| |
| // Same as above but for a CRL |
| |
| int X509V3_EXT_CRL_add_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| const char *section, X509_CRL *crl) { |
| STACK_OF(X509_EXTENSION) **sk = NULL; |
| if (crl) { |
| sk = &crl->crl->extensions; |
| } |
| return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
| } |
| |
| // Add extensions to certificate request |
| |
| int X509V3_EXT_REQ_add_nconf(const CONF *conf, const X509V3_CTX *ctx, |
| const char *section, X509_REQ *req) { |
| STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; |
| int i; |
| if (req) { |
| sk = &extlist; |
| } |
| i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); |
| if (!i || !sk) { |
| return i; |
| } |
| i = X509_REQ_add_extensions(req, extlist); |
| sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); |
| return i; |
| } |
| |
| // Config database functions |
| |
| const STACK_OF(CONF_VALUE) *X509V3_get_section(const X509V3_CTX *ctx, |
| const char *section) { |
| if (ctx->db == NULL) { |
| OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); |
| return NULL; |
| } |
| return NCONF_get_section(ctx->db, section); |
| } |
| |
| void X509V3_set_nconf(X509V3_CTX *ctx, const CONF *conf) { ctx->db = conf; } |
| |
| void X509V3_set_ctx(X509V3_CTX *ctx, const X509 *issuer, const X509 *subj, |
| const X509_REQ *req, const X509_CRL *crl, int flags) { |
| OPENSSL_memset(ctx, 0, sizeof(*ctx)); |
| ctx->issuer_cert = issuer; |
| ctx->subject_cert = subj; |
| ctx->crl = crl; |
| ctx->subject_req = req; |
| ctx->flags = flags; |
| } |