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- /*
- * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- /* extension creation utilities */
- #include <stdio.h>
- #include "crypto/ctype.h"
- #include "internal/cryptlib.h"
- #include <openssl/conf.h>
- #include <openssl/x509.h>
- #include "crypto/x509.h"
- #include <openssl/x509v3.h>
- static int v3_check_critical(const char **value);
- static int v3_check_generic(const char **value);
- static X509_EXTENSION *do_ext_nconf(CONF *conf, 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,
- X509V3_CTX *ctx);
- static char *conf_lhash_get_string(void *db, const char *section, const char *value);
- static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section);
- 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, X509V3_CTX *ctx,
- long *ext_len);
- static X509_EXTENSION *X509V3_EXT_nconf_int(CONF *conf, X509V3_CTX *ctx,
- const char *section,
- const char *name, const char *value)
- {
- int crit;
- int ext_type;
- X509_EXTENSION *ret;
- crit = v3_check_critical(&value);
- if ((ext_type = v3_check_generic(&value)))
- return v3_generic_extension(name, value, crit, ext_type, ctx);
- ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
- if (!ret) {
- if (section != NULL)
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_ERROR_IN_EXTENSION,
- "section=%s, name=%s, value=%s",
- section, name, value);
- else
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_ERROR_IN_EXTENSION,
- "name=%s, value=%s", name, value);
- }
- return ret;
- }
- X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
- const char *value)
- {
- return X509V3_EXT_nconf_int(conf, ctx, NULL, name, value);
- }
- X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
- const char *value)
- {
- int crit;
- int ext_type;
- crit = v3_check_critical(&value);
- if ((ext_type = v3_check_generic(&value)))
- 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(CONF *conf, X509V3_CTX *ctx, int ext_nid,
- int crit, const char *value)
- {
- const X509V3_EXT_METHOD *method;
- X509_EXTENSION *ext;
- STACK_OF(CONF_VALUE) *nval;
- void *ext_struc;
- if (ext_nid == NID_undef) {
- ERR_raise(ERR_LIB_X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME);
- return NULL;
- }
- if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
- ERR_raise(ERR_LIB_X509V3, X509V3_R_UNKNOWN_EXTENSION);
- return NULL;
- }
- /* Now get internal extension representation based on type */
- if (method->v2i) {
- if (*value == '@')
- nval = NCONF_get_section(conf, value + 1);
- else
- nval = X509V3_parse_list(value);
- if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_INVALID_EXTENSION_STRING,
- "name=%s,section=%s", OBJ_nid2sn(ext_nid), value);
- if (*value != '@')
- sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
- return NULL;
- }
- ext_struc = method->v2i(method, ctx, nval);
- if (*value != '@')
- sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
- if (!ext_struc)
- return NULL;
- } else if (method->s2i) {
- if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
- return NULL;
- } else if (method->r2i) {
- if (!ctx->db || !ctx->db_meth) {
- ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_CONFIG_DATABASE);
- return NULL;
- }
- if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
- return NULL;
- } else {
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED,
- "name=%s", OBJ_nid2sn(ext_nid));
- return NULL;
- }
- ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
- if (method->it)
- ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
- else
- method->ext_free(ext_struc);
- return ext;
- }
- static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
- int ext_nid, int crit, void *ext_struc)
- {
- unsigned char *ext_der = NULL;
- int ext_len;
- ASN1_OCTET_STRING *ext_oct = NULL;
- X509_EXTENSION *ext;
- /* Convert internal representation to DER */
- if (method->it) {
- ext_der = NULL;
- ext_len =
- ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
- if (ext_len < 0) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
- goto err;
- }
- } else {
- unsigned char *p;
- ext_len = method->i2d(ext_struc, NULL);
- if (ext_len <= 0) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
- goto err;
- }
- if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
- goto err;
- p = ext_der;
- method->i2d(ext_struc, &p);
- }
- if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
- goto err;
- }
- ext_oct->data = ext_der;
- ext_der = NULL;
- ext_oct->length = ext_len;
- ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
- if (!ext) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_X509V3_LIB);
- goto err;
- }
- ASN1_OCTET_STRING_free(ext_oct);
- return ext;
- err:
- OPENSSL_free(ext_der);
- ASN1_OCTET_STRING_free(ext_oct);
- return NULL;
- }
- /* 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)) == NULL) {
- ERR_raise(ERR_LIB_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 (!CHECK_AND_SKIP_PREFIX(p, "critical,"))
- return 0;
- while (ossl_isspace(*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 (CHECK_AND_SKIP_PREFIX(p, "DER:")) {
- gen_type = 1;
- } else if (CHECK_AND_SKIP_PREFIX(p, "ASN1:")) {
- gen_type = 2;
- } else
- return 0;
- while (ossl_isspace(*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,
- X509V3_CTX *ctx)
- {
- unsigned char *ext_der = NULL;
- long ext_len = 0;
- ASN1_OBJECT *obj = NULL;
- ASN1_OCTET_STRING *oct = NULL;
- X509_EXTENSION *extension = NULL;
- if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_EXTENSION_NAME_ERROR,
- "name=%s", ext);
- goto err;
- }
- if (gen_type == 1)
- ext_der = OPENSSL_hexstr2buf(value, &ext_len);
- else if (gen_type == 2)
- ext_der = generic_asn1(value, ctx, &ext_len);
- if (ext_der == NULL) {
- ERR_raise_data(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR,
- "value=%s", value);
- goto err;
- }
- if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
- goto err;
- }
- oct->data = ext_der;
- oct->length = ext_len;
- ext_der = NULL;
- extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
- err:
- ASN1_OBJECT_free(obj);
- ASN1_OCTET_STRING_free(oct);
- OPENSSL_free(ext_der);
- return extension;
- }
- static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
- long *ext_len)
- {
- ASN1_TYPE *typ;
- unsigned char *ext_der = NULL;
- typ = ASN1_generate_v3(value, ctx);
- if (typ == NULL)
- return NULL;
- *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
- ASN1_TYPE_free(typ);
- return ext_der;
- }
- static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
- {
- int idx;
- ASN1_OBJECT *obj;
- obj = X509_EXTENSION_get_object(dext);
- while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0)
- X509_EXTENSION_free(X509v3_delete_ext(sk, idx));
- }
- /*
- * This is the main function: add a bunch of extensions based on a config
- * file section to an extension STACK. Just check in case sk == NULL.
- * Note that on error new elements may have been added to *sk if sk != NULL.
- */
- int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,
- STACK_OF(X509_EXTENSION) **sk)
- {
- X509_EXTENSION *ext;
- STACK_OF(CONF_VALUE) *nval;
- const CONF_VALUE *val;
- int i, akid = -1, skid = -1;
- if ((nval = NCONF_get_section(conf, section)) == NULL)
- return 0;
- for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
- val = sk_CONF_VALUE_value(nval, i);
- if (strcmp(val->name, "authorityKeyIdentifier") == 0)
- akid = i;
- else if (strcmp(val->name, "subjectKeyIdentifier") == 0)
- skid = i;
- }
- for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
- val = sk_CONF_VALUE_value(nval, i);
- if (skid > akid && akid >= 0) {
- /* make sure SKID is handled before AKID */
- if (i == akid)
- val = sk_CONF_VALUE_value(nval, skid);
- else if (i == skid)
- val = sk_CONF_VALUE_value(nval, akid);
- }
- if ((ext = X509V3_EXT_nconf_int(conf, ctx, val->section,
- val->name, val->value)) == NULL)
- return 0;
- if (sk != NULL) {
- if (ctx->flags == X509V3_CTX_REPLACE)
- delete_ext(*sk, ext);
- if (X509v3_add_ext(sk, ext, -1) == NULL) {
- X509_EXTENSION_free(ext);
- return 0;
- }
- }
- X509_EXTENSION_free(ext);
- }
- return 1;
- }
- /*
- * Add extensions to a certificate. Just check in case cert == NULL.
- * Note that on error new elements may remain added to cert if cert != NULL.
- */
- int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
- X509 *cert)
- {
- STACK_OF(X509_EXTENSION) **sk = NULL;
- if (cert != NULL)
- sk = &cert->cert_info.extensions;
- return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
- }
- /*
- * Add extensions to a CRL. Just check in case crl == NULL.
- * Note that on error new elements may remain added to crl if crl != NULL.
- */
- int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
- X509_CRL *crl)
- {
- STACK_OF(X509_EXTENSION) **sk = NULL;
- if (crl != NULL)
- sk = &crl->crl.extensions;
- return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
- }
- /*
- * Add extensions to certificate request. Just check in case req is NULL.
- * Note that on error new elements may remain added to req if req != NULL.
- */
- int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
- X509_REQ *req)
- {
- STACK_OF(X509_EXTENSION) *exts = NULL;
- int ret = X509V3_EXT_add_nconf_sk(conf, ctx, section, &exts);
- if (ret && req != NULL && exts != NULL)
- ret = X509_REQ_add_extensions(req, exts);
- sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
- return ret;
- }
- /* Config database functions */
- char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)
- {
- if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
- ERR_raise(ERR_LIB_X509V3, X509V3_R_OPERATION_NOT_DEFINED);
- return NULL;
- }
- if (ctx->db_meth->get_string)
- return ctx->db_meth->get_string(ctx->db, name, section);
- return NULL;
- }
- STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section)
- {
- if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
- ERR_raise(ERR_LIB_X509V3, X509V3_R_OPERATION_NOT_DEFINED);
- return NULL;
- }
- if (ctx->db_meth->get_section)
- return ctx->db_meth->get_section(ctx->db, section);
- return NULL;
- }
- void X509V3_string_free(X509V3_CTX *ctx, char *str)
- {
- if (!str)
- return;
- if (ctx->db_meth->free_string)
- ctx->db_meth->free_string(ctx->db, str);
- }
- void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
- {
- if (!section)
- return;
- if (ctx->db_meth->free_section)
- ctx->db_meth->free_section(ctx->db, section);
- }
- static char *nconf_get_string(void *db, const char *section, const char *value)
- {
- return NCONF_get_string(db, section, value);
- }
- static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section)
- {
- return NCONF_get_section(db, section);
- }
- static X509V3_CONF_METHOD nconf_method = {
- nconf_get_string,
- nconf_get_section,
- NULL,
- NULL
- };
- void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
- {
- if (ctx == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
- return;
- }
- ctx->db_meth = &nconf_method;
- ctx->db = conf;
- }
- void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
- X509_CRL *crl, int flags)
- {
- if (ctx == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
- return;
- }
- ctx->flags = flags;
- ctx->issuer_cert = issuer;
- ctx->subject_cert = subj;
- ctx->subject_req = req;
- ctx->crl = crl;
- ctx->db_meth = NULL;
- ctx->db = NULL;
- ctx->issuer_pkey = NULL;
- }
- /* For API backward compatibility, this is separate from X509V3_set_ctx() */
- int X509V3_set_issuer_pkey(X509V3_CTX *ctx, EVP_PKEY *pkey)
- {
- if (ctx == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- if (ctx->subject_cert == NULL && pkey != NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_INVALID_ARGUMENT);
- return 0;
- }
- ctx->issuer_pkey = pkey;
- return 1;
- }
- /* Old conf compatibility functions */
- X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
- const char *name, const char *value)
- {
- CONF *ctmp;
- X509_EXTENSION *ret;
- if ((ctmp = NCONF_new(NULL)) == NULL)
- return NULL;
- CONF_set_nconf(ctmp, conf);
- ret = X509V3_EXT_nconf(ctmp, ctx, name, value);
- CONF_set_nconf(ctmp, NULL);
- NCONF_free(ctmp);
- return ret;
- }
- X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
- X509V3_CTX *ctx, int ext_nid, const char *value)
- {
- CONF *ctmp;
- X509_EXTENSION *ret;
- if ((ctmp = NCONF_new(NULL)) == NULL)
- return NULL;
- CONF_set_nconf(ctmp, conf);
- ret = X509V3_EXT_nconf_nid(ctmp, ctx, ext_nid, value);
- CONF_set_nconf(ctmp, NULL);
- NCONF_free(ctmp);
- return ret;
- }
- static char *conf_lhash_get_string(void *db, const char *section, const char *value)
- {
- return CONF_get_string(db, section, value);
- }
- static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section)
- {
- 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)
- {
- if (ctx == NULL) {
- ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
- return;
- }
- 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;
- int ret;
- if ((ctmp = NCONF_new(NULL)) == NULL)
- return 0;
- CONF_set_nconf(ctmp, conf);
- ret = X509V3_EXT_add_nconf(ctmp, ctx, section, cert);
- CONF_set_nconf(ctmp, NULL);
- NCONF_free(ctmp);
- return ret;
- }
- /* 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;
- int ret;
- if ((ctmp = NCONF_new(NULL)) == NULL)
- return 0;
- CONF_set_nconf(ctmp, conf);
- ret = X509V3_EXT_CRL_add_nconf(ctmp, ctx, section, crl);
- CONF_set_nconf(ctmp, NULL);
- NCONF_free(ctmp);
- return ret;
- }
- /* 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;
- int ret;
- if ((ctmp = NCONF_new(NULL)) == NULL)
- return 0;
- CONF_set_nconf(ctmp, conf);
- ret = X509V3_EXT_REQ_add_nconf(ctmp, ctx, section, req);
- CONF_set_nconf(ctmp, NULL);
- NCONF_free(ctmp);
- return ret;
- }
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