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https://github.com/openssl/openssl.git
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306 lines
8.3 KiB
C
306 lines
8.3 KiB
C
/*
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* Copyright 1999-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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/* X509 v3 extension utilities */
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/conf.h>
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#include <openssl/x509v3.h>
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#include "ext_dat.h"
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static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
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static int ext_cmp(const X509V3_EXT_METHOD *const *a,
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const X509V3_EXT_METHOD *const *b);
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static void ext_list_free(X509V3_EXT_METHOD *ext);
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int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
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{
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if (ext_list == NULL
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&& (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) {
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ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
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return 0;
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}
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if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
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ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
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return 0;
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}
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return 1;
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}
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static int ext_cmp(const X509V3_EXT_METHOD *const *a,
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const X509V3_EXT_METHOD *const *b)
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{
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return ((*a)->ext_nid - (*b)->ext_nid);
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}
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DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
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const X509V3_EXT_METHOD *, ext);
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IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
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const X509V3_EXT_METHOD *, ext);
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#include "standard_exts.h"
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const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
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{
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X509V3_EXT_METHOD tmp;
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const X509V3_EXT_METHOD *t = &tmp, *const *ret;
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int idx;
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if (nid < 0)
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return NULL;
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tmp.ext_nid = nid;
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ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
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if (ret)
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return *ret;
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if (!ext_list)
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return NULL;
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/* Ideally, this would be done under a lock */
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sk_X509V3_EXT_METHOD_sort(ext_list);
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idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
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/* A failure to locate the item is handled by the value method */
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return sk_X509V3_EXT_METHOD_value(ext_list, idx);
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}
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const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
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{
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int nid;
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if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef)
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return NULL;
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return X509V3_EXT_get_nid(nid);
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}
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int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
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{
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for (; extlist->ext_nid != -1; extlist++)
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if (!X509V3_EXT_add(extlist))
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return 0;
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return 1;
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}
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int X509V3_EXT_add_alias(int nid_to, int nid_from)
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{
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const X509V3_EXT_METHOD *ext;
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X509V3_EXT_METHOD *tmpext;
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if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) {
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ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_NOT_FOUND);
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return 0;
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}
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if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL)
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return 0;
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*tmpext = *ext;
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tmpext->ext_nid = nid_to;
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tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
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return X509V3_EXT_add(tmpext);
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}
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void X509V3_EXT_cleanup(void)
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{
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sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
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ext_list = NULL;
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}
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static void ext_list_free(X509V3_EXT_METHOD *ext)
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{
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if (ext->ext_flags & X509V3_EXT_DYNAMIC)
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OPENSSL_free(ext);
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}
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/*
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* Legacy function: we don't need to add standard extensions any more because
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* they are now kept in ext_dat.h.
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*/
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int X509V3_add_standard_extensions(void)
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{
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return 1;
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}
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/* Return an extension internal structure */
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void *X509V3_EXT_d2i(X509_EXTENSION *ext)
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{
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const X509V3_EXT_METHOD *method;
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const unsigned char *p;
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ASN1_STRING *extvalue;
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int extlen;
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if ((method = X509V3_EXT_get(ext)) == NULL)
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return NULL;
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extvalue = X509_EXTENSION_get_data(ext);
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p = ASN1_STRING_get0_data(extvalue);
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extlen = ASN1_STRING_length(extvalue);
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if (method->it)
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return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
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return method->d2i(NULL, &p, extlen);
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}
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/*-
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* Get critical flag and decoded version of extension from a NID.
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* The "idx" variable returns the last found extension and can
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* be used to retrieve multiple extensions of the same NID.
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* However multiple extensions with the same NID is usually
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* due to a badly encoded certificate so if idx is NULL we
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* choke if multiple extensions exist.
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* The "crit" variable is set to the critical value.
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* The return value is the decoded extension or NULL on
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* error. The actual error can have several different causes,
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* the value of *crit reflects the cause:
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* >= 0, extension found but not decoded (reflects critical value).
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* -1 extension not found.
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* -2 extension occurs more than once.
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*/
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void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
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int *idx)
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{
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int lastpos, i;
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X509_EXTENSION *ex, *found_ex = NULL;
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if (!x) {
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if (idx)
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*idx = -1;
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if (crit)
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*crit = -1;
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return NULL;
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}
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if (idx)
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lastpos = *idx + 1;
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else
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lastpos = 0;
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if (lastpos < 0)
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lastpos = 0;
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for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
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ex = sk_X509_EXTENSION_value(x, i);
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if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) {
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if (idx) {
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*idx = i;
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found_ex = ex;
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break;
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} else if (found_ex) {
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/* Found more than one */
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if (crit)
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*crit = -2;
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return NULL;
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}
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found_ex = ex;
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}
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}
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if (found_ex) {
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/* Found it */
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if (crit)
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*crit = X509_EXTENSION_get_critical(found_ex);
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return X509V3_EXT_d2i(found_ex);
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}
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/* Extension not found */
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if (idx)
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*idx = -1;
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if (crit)
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*crit = -1;
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return NULL;
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}
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/*
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* This function is a general extension append, replace and delete utility.
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* The precise operation is governed by the 'flags' value. The 'crit' and
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* 'value' arguments (if relevant) are the extensions internal structure.
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*/
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int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
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int crit, unsigned long flags)
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{
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int errcode, extidx = -1;
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X509_EXTENSION *ext = NULL, *extmp;
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STACK_OF(X509_EXTENSION) *ret = NULL;
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unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
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/*
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* If appending we don't care if it exists, otherwise look for existing
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* extension.
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*/
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if (ext_op != X509V3_ADD_APPEND)
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extidx = X509v3_get_ext_by_NID(*x, nid, -1);
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/* See if extension exists */
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if (extidx >= 0) {
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/* If keep existing, nothing to do */
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if (ext_op == X509V3_ADD_KEEP_EXISTING)
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return 1;
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/* If default then its an error */
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if (ext_op == X509V3_ADD_DEFAULT) {
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errcode = X509V3_R_EXTENSION_EXISTS;
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goto err;
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}
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/* If delete, just delete it */
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if (ext_op == X509V3_ADD_DELETE) {
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extmp = sk_X509_EXTENSION_delete(*x, extidx);
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if (extmp == NULL)
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return -1;
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X509_EXTENSION_free(extmp);
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return 1;
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}
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} else {
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/*
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* If replace existing or delete, error since extension must exist
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*/
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if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
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(ext_op == X509V3_ADD_DELETE)) {
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errcode = X509V3_R_EXTENSION_NOT_FOUND;
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goto err;
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}
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}
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/*
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* If we get this far then we have to create an extension: could have
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* some flags for alternative encoding schemes...
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*/
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ext = X509V3_EXT_i2d(nid, crit, value);
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if (!ext) {
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ERR_raise(ERR_LIB_X509V3, X509V3_R_ERROR_CREATING_EXTENSION);
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return 0;
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}
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/* If extension exists replace it.. */
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if (extidx >= 0) {
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extmp = sk_X509_EXTENSION_value(*x, extidx);
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X509_EXTENSION_free(extmp);
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if (!sk_X509_EXTENSION_set(*x, extidx, ext))
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return -1;
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return 1;
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}
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ret = *x;
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if (*x == NULL
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&& (ret = sk_X509_EXTENSION_new_null()) == NULL)
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goto m_fail;
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if (!sk_X509_EXTENSION_push(ret, ext))
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goto m_fail;
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*x = ret;
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return 1;
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m_fail:
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/* ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB); */
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if (ret != *x)
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sk_X509_EXTENSION_free(ret);
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X509_EXTENSION_free(ext);
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return -1;
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err:
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if (!(flags & X509V3_ADD_SILENT))
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ERR_raise(ERR_LIB_X509V3, errcode);
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return 0;
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}
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