512 lines
15 KiB
C
512 lines
15 KiB
C
/*
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* Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* extension creation utilities */
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#include <stdio.h>
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#include "crypto/ctype.h"
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#include "internal/cryptlib.h"
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#include <openssl/conf.h>
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#include <openssl/x509.h>
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#include "crypto/x509.h"
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#include <openssl/x509v3.h>
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static int v3_check_critical(const char **value);
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static int v3_check_generic(const char **value);
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static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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int crit, const char *value);
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static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
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int crit, int type,
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X509V3_CTX *ctx);
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static char *conf_lhash_get_string(void *db, const char *section, const char *value);
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static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section);
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static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
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int ext_nid, int crit, void *ext_struc);
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static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
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long *ext_len);
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/* CONF *conf: Config file */
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/* char *name: Name */
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/* char *value: Value */
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X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
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const char *value)
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{
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int crit;
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int ext_type;
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X509_EXTENSION *ret;
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crit = v3_check_critical(&value);
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if ((ext_type = v3_check_generic(&value)))
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return v3_generic_extension(name, value, crit, ext_type, ctx);
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ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
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if (!ret) {
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X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION);
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ERR_add_error_data(4, "name=", name, ", value=", value);
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}
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return ret;
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}
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/* CONF *conf: Config file */
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/* char *value: Value */
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X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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const char *value)
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{
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int crit;
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int ext_type;
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crit = v3_check_critical(&value);
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if ((ext_type = v3_check_generic(&value)))
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return v3_generic_extension(OBJ_nid2sn(ext_nid),
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value, crit, ext_type, ctx);
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return do_ext_nconf(conf, ctx, ext_nid, crit, value);
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}
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/* CONF *conf: Config file */
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/* char *value: Value */
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static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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int crit, const char *value)
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{
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const X509V3_EXT_METHOD *method;
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X509_EXTENSION *ext;
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STACK_OF(CONF_VALUE) *nval;
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void *ext_struc;
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if (ext_nid == NID_undef) {
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X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
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return NULL;
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}
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if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
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X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
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return NULL;
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}
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/* Now get internal extension representation based on type */
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if (method->v2i) {
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if (*value == '@')
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nval = NCONF_get_section(conf, value + 1);
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else
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nval = X509V3_parse_list(value);
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if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
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X509V3err(X509V3_F_DO_EXT_NCONF,
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X509V3_R_INVALID_EXTENSION_STRING);
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ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
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value);
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if (*value != '@')
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sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
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return NULL;
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}
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ext_struc = method->v2i(method, ctx, nval);
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if (*value != '@')
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sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
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if (!ext_struc)
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return NULL;
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} else if (method->s2i) {
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if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
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return NULL;
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} else if (method->r2i) {
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if (!ctx->db || !ctx->db_meth) {
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X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
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return NULL;
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}
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if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
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return NULL;
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} else {
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X509V3err(X509V3_F_DO_EXT_NCONF,
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X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
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ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
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return NULL;
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}
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ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
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if (method->it)
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ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
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else
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method->ext_free(ext_struc);
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return ext;
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}
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static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
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int ext_nid, int crit, void *ext_struc)
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{
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unsigned char *ext_der = NULL;
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int ext_len;
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ASN1_OCTET_STRING *ext_oct = NULL;
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X509_EXTENSION *ext;
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/* Convert internal representation to DER */
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if (method->it) {
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ext_der = NULL;
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ext_len =
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ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
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if (ext_len < 0)
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goto merr;
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} else {
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unsigned char *p;
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ext_len = method->i2d(ext_struc, NULL);
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if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
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goto merr;
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p = ext_der;
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method->i2d(ext_struc, &p);
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}
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if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL)
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goto merr;
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ext_oct->data = ext_der;
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ext_der = NULL;
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ext_oct->length = ext_len;
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ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
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if (!ext)
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goto merr;
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ASN1_OCTET_STRING_free(ext_oct);
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return ext;
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merr:
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X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(ext_der);
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ASN1_OCTET_STRING_free(ext_oct);
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return NULL;
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}
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/* Given an internal structure, nid and critical flag create an extension */
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X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
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{
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const X509V3_EXT_METHOD *method;
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if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
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X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
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return NULL;
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}
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return do_ext_i2d(method, ext_nid, crit, ext_struc);
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}
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/* Check the extension string for critical flag */
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static int v3_check_critical(const char **value)
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{
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const char *p = *value;
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if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
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return 0;
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p += 9;
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while (ossl_isspace(*p))
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p++;
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*value = p;
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return 1;
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}
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/* Check extension string for generic extension and return the type */
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static int v3_check_generic(const char **value)
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{
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int gen_type = 0;
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const char *p = *value;
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if ((strlen(p) >= 4) && strncmp(p, "DER:", 4) == 0) {
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p += 4;
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gen_type = 1;
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} else if ((strlen(p) >= 5) && strncmp(p, "ASN1:", 5) == 0) {
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p += 5;
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gen_type = 2;
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} else
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return 0;
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while (ossl_isspace(*p))
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p++;
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*value = p;
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return gen_type;
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}
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/* Create a generic extension: for now just handle DER type */
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static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
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int crit, int gen_type,
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X509V3_CTX *ctx)
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{
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unsigned char *ext_der = NULL;
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long ext_len = 0;
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ASN1_OBJECT *obj = NULL;
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ASN1_OCTET_STRING *oct = NULL;
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X509_EXTENSION *extension = NULL;
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if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
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X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
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X509V3_R_EXTENSION_NAME_ERROR);
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ERR_add_error_data(2, "name=", ext);
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goto err;
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}
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if (gen_type == 1)
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ext_der = OPENSSL_hexstr2buf(value, &ext_len);
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else if (gen_type == 2)
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ext_der = generic_asn1(value, ctx, &ext_len);
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if (ext_der == NULL) {
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X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
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X509V3_R_EXTENSION_VALUE_ERROR);
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ERR_add_error_data(2, "value=", value);
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goto err;
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}
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if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
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X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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oct->data = ext_der;
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oct->length = ext_len;
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ext_der = NULL;
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extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
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err:
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ASN1_OBJECT_free(obj);
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ASN1_OCTET_STRING_free(oct);
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OPENSSL_free(ext_der);
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return extension;
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}
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static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
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long *ext_len)
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{
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ASN1_TYPE *typ;
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unsigned char *ext_der = NULL;
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typ = ASN1_generate_v3(value, ctx);
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if (typ == NULL)
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return NULL;
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*ext_len = i2d_ASN1_TYPE(typ, &ext_der);
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ASN1_TYPE_free(typ);
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return ext_der;
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}
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static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
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{
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int idx;
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ASN1_OBJECT *obj;
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obj = X509_EXTENSION_get_object(dext);
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while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
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X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
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X509v3_delete_ext(sk, idx);
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X509_EXTENSION_free(tmpext);
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}
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}
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/*
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* This is the main function: add a bunch of extensions based on a config
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* file section to an extension STACK.
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*/
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int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,
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STACK_OF(X509_EXTENSION) **sk)
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{
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X509_EXTENSION *ext;
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STACK_OF(CONF_VALUE) *nval;
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CONF_VALUE *val;
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int i;
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if ((nval = NCONF_get_section(conf, section)) == NULL)
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return 0;
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for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
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val = sk_CONF_VALUE_value(nval, i);
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if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL)
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return 0;
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if (ctx->flags == X509V3_CTX_REPLACE)
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delete_ext(*sk, ext);
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if (sk != NULL) {
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if (X509v3_add_ext(sk, ext, -1) == NULL) {
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X509_EXTENSION_free(ext);
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return 0;
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}
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}
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X509_EXTENSION_free(ext);
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}
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return 1;
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}
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/*
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* Convenience functions to add extensions to a certificate, CRL and request
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*/
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int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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X509 *cert)
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{
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STACK_OF(X509_EXTENSION) **sk = NULL;
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if (cert)
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sk = &cert->cert_info.extensions;
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return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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}
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/* Same as above but for a CRL */
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int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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X509_CRL *crl)
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{
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STACK_OF(X509_EXTENSION) **sk = NULL;
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if (crl)
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sk = &crl->crl.extensions;
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return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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}
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/* Add extensions to certificate request */
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int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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X509_REQ *req)
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{
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STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
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int i;
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if (req)
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sk = &extlist;
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i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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if (!i || !sk)
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return i;
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i = X509_REQ_add_extensions(req, extlist);
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sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
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return i;
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}
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/* Config database functions */
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char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)
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{
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if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
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X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
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return NULL;
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}
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if (ctx->db_meth->get_string)
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return ctx->db_meth->get_string(ctx->db, name, section);
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return NULL;
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}
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STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section)
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{
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if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
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X509V3err(X509V3_F_X509V3_GET_SECTION,
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X509V3_R_OPERATION_NOT_DEFINED);
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return NULL;
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}
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if (ctx->db_meth->get_section)
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return ctx->db_meth->get_section(ctx->db, section);
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return NULL;
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}
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void X509V3_string_free(X509V3_CTX *ctx, char *str)
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{
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if (!str)
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return;
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if (ctx->db_meth->free_string)
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ctx->db_meth->free_string(ctx->db, str);
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}
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void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
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{
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if (!section)
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return;
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if (ctx->db_meth->free_section)
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ctx->db_meth->free_section(ctx->db, section);
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}
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static char *nconf_get_string(void *db, const char *section, const char *value)
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{
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return NCONF_get_string(db, section, value);
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}
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static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section)
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{
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return NCONF_get_section(db, section);
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}
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static X509V3_CONF_METHOD nconf_method = {
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nconf_get_string,
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nconf_get_section,
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NULL,
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NULL
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};
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void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
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{
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ctx->db_meth = &nconf_method;
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ctx->db = conf;
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}
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void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
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X509_CRL *crl, int flags)
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{
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ctx->issuer_cert = issuer;
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ctx->subject_cert = subj;
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ctx->crl = crl;
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ctx->subject_req = req;
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ctx->flags = flags;
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}
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/* Old conf compatibility functions */
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X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
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const char *name, const char *value)
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{
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CONF ctmp;
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CONF_set_nconf(&ctmp, conf);
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return X509V3_EXT_nconf(&ctmp, ctx, name, value);
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}
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/* LHASH *conf: Config file */
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/* char *value: Value */
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X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
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X509V3_CTX *ctx, int ext_nid, const char *value)
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{
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CONF ctmp;
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CONF_set_nconf(&ctmp, conf);
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return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
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}
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static char *conf_lhash_get_string(void *db, const char *section, const char *value)
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{
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return CONF_get_string(db, section, value);
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}
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static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section)
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{
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return CONF_get_section(db, section);
|
|
}
|
|
|
|
static X509V3_CONF_METHOD conf_lhash_method = {
|
|
conf_lhash_get_string,
|
|
conf_lhash_get_section,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
|
|
{
|
|
ctx->db_meth = &conf_lhash_method;
|
|
ctx->db = lhash;
|
|
}
|
|
|
|
int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
|
const char *section, X509 *cert)
|
|
{
|
|
CONF ctmp;
|
|
CONF_set_nconf(&ctmp, conf);
|
|
return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
|
|
}
|
|
|
|
/* Same as above but for a CRL */
|
|
|
|
int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
|
const char *section, X509_CRL *crl)
|
|
{
|
|
CONF ctmp;
|
|
CONF_set_nconf(&ctmp, conf);
|
|
return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
|
|
}
|
|
|
|
/* Add extensions to certificate request */
|
|
|
|
int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
|
const char *section, X509_REQ *req)
|
|
{
|
|
CONF ctmp;
|
|
CONF_set_nconf(&ctmp, conf);
|
|
return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
|
|
}
|