--- /dev/null
+/* v3_ncons.c */
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2003 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/asn1t.h>
+#include <openssl/conf.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/obj.h>
+#include <openssl/x509v3.h>
+
+#include "../internal.h"
+
+
+static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
+ X509V3_CTX *ctx,
+ STACK_OF(CONF_VALUE) *nval);
+static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
+ BIO *bp, int ind);
+static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
+ STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp,
+ int ind, const char *name);
+static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
+
+static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
+static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
+static int nc_dn(X509_NAME *sub, X509_NAME *nm);
+static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
+static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
+static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
+
+const X509V3_EXT_METHOD v3_name_constraints = {
+ NID_name_constraints, 0,
+ ASN1_ITEM_ref(NAME_CONSTRAINTS),
+ 0, 0, 0, 0,
+ 0, 0,
+ 0, v2i_NAME_CONSTRAINTS,
+ i2r_NAME_CONSTRAINTS, 0,
+ NULL
+};
+
+ASN1_SEQUENCE(GENERAL_SUBTREE) = {
+ ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
+ ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
+ ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
+} ASN1_SEQUENCE_END(GENERAL_SUBTREE)
+
+ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
+ ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
+ GENERAL_SUBTREE, 0),
+ ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
+ GENERAL_SUBTREE, 1),
+} ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
+
+
+IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
+IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
+
+static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
+ X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
+{
+ size_t i;
+ CONF_VALUE tval, *val;
+ STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
+ NAME_CONSTRAINTS *ncons = NULL;
+ GENERAL_SUBTREE *sub = NULL;
+ ncons = NAME_CONSTRAINTS_new();
+ if (!ncons)
+ goto memerr;
+ for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
+ val = sk_CONF_VALUE_value(nval, i);
+ if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
+ ptree = &ncons->permittedSubtrees;
+ tval.name = val->name + 10;
+ } else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
+ ptree = &ncons->excludedSubtrees;
+ tval.name = val->name + 9;
+ } else {
+ OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_SYNTAX);
+ goto err;
+ }
+ tval.value = val->value;
+ sub = GENERAL_SUBTREE_new();
+ if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
+ goto err;
+ if (!*ptree)
+ *ptree = sk_GENERAL_SUBTREE_new_null();
+ if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
+ goto memerr;
+ sub = NULL;
+ }
+
+ return ncons;
+
+ memerr:
+ OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
+ err:
+ if (ncons)
+ NAME_CONSTRAINTS_free(ncons);
+ if (sub)
+ GENERAL_SUBTREE_free(sub);
+
+ return NULL;
+}
+
+static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
+ BIO *bp, int ind)
+{
+ NAME_CONSTRAINTS *ncons = a;
+ do_i2r_name_constraints(method, ncons->permittedSubtrees,
+ bp, ind, "Permitted");
+ do_i2r_name_constraints(method, ncons->excludedSubtrees,
+ bp, ind, "Excluded");
+ return 1;
+}
+
+static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
+ STACK_OF(GENERAL_SUBTREE) *trees,
+ BIO *bp, int ind, const char *name)
+{
+ GENERAL_SUBTREE *tree;
+ size_t i;
+ if (sk_GENERAL_SUBTREE_num(trees) > 0)
+ BIO_printf(bp, "%*s%s:\n", ind, "", name);
+ for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
+ tree = sk_GENERAL_SUBTREE_value(trees, i);
+ BIO_printf(bp, "%*s", ind + 2, "");
+ if (tree->base->type == GEN_IPADD)
+ print_nc_ipadd(bp, tree->base->d.ip);
+ else
+ GENERAL_NAME_print(bp, tree->base);
+ BIO_puts(bp, "\n");
+ }
+ return 1;
+}
+
+static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
+{
+ int i, len;
+ unsigned char *p;
+ p = ip->data;
+ len = ip->length;
+ BIO_puts(bp, "IP:");
+ if (len == 8) {
+ BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+ } else if (len == 32) {
+ for (i = 0; i < 16; i++) {
+ BIO_printf(bp, "%X", p[0] << 8 | p[1]);
+ p += 2;
+ if (i == 7)
+ BIO_puts(bp, "/");
+ else if (i != 15)
+ BIO_puts(bp, ":");
+ }
+ } else
+ BIO_printf(bp, "IP Address:<invalid>");
+ return 1;
+}
+
+/*-
+ * Check a certificate conforms to a specified set of constraints.
+ * Return values:
+ * X509_V_OK: All constraints obeyed.
+ * X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
+ * X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
+ * X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
+ * X509_V_ERR_UNSPECIFIED: Unspecified error.
+ * X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
+ * X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: Bad or unsupported constraint
+ * syntax.
+ * X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: Bad or unsupported syntax of name.
+ */
+
+int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
+{
+ int r, i;
+ size_t j;
+ X509_NAME *nm;
+
+ nm = X509_get_subject_name(x);
+
+ /* Guard against certificates with an excessive number of names or
+ * constraints causing a computationally expensive name constraints
+ * check. */
+ size_t name_count =
+ X509_NAME_entry_count(nm) + sk_GENERAL_NAME_num(x->altname);
+ size_t constraint_count = sk_GENERAL_SUBTREE_num(nc->permittedSubtrees) +
+ sk_GENERAL_SUBTREE_num(nc->excludedSubtrees);
+ size_t check_count = constraint_count * name_count;
+ if (name_count < (size_t)X509_NAME_entry_count(nm) ||
+ constraint_count < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees) ||
+ (constraint_count && check_count / constraint_count != name_count) ||
+ check_count > 1 << 20) {
+ return X509_V_ERR_UNSPECIFIED;
+ }
+
+ if (X509_NAME_entry_count(nm) > 0) {
+ GENERAL_NAME gntmp;
+ gntmp.type = GEN_DIRNAME;
+ gntmp.d.directoryName = nm;
+
+ r = nc_match(&gntmp, nc);
+
+ if (r != X509_V_OK)
+ return r;
+
+ gntmp.type = GEN_EMAIL;
+
+ /* Process any email address attributes in subject name */
+
+ for (i = -1;;) {
+ X509_NAME_ENTRY *ne;
+ i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
+ if (i == -1)
+ break;
+ ne = X509_NAME_get_entry(nm, i);
+ gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
+ if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+
+ r = nc_match(&gntmp, nc);
+
+ if (r != X509_V_OK)
+ return r;
+ }
+
+ }
+
+ for (j = 0; j < sk_GENERAL_NAME_num(x->altname); j++) {
+ GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, j);
+ r = nc_match(gen, nc);
+ if (r != X509_V_OK)
+ return r;
+ }
+
+ return X509_V_OK;
+
+}
+
+static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
+{
+ GENERAL_SUBTREE *sub;
+ int r, match = 0;
+ size_t i;
+
+ /*
+ * Permitted subtrees: if any subtrees exist of matching the type at
+ * least one subtree must match.
+ */
+
+ for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
+ sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
+ if (gen->type != sub->base->type)
+ continue;
+ if (sub->minimum || sub->maximum)
+ return X509_V_ERR_SUBTREE_MINMAX;
+ /* If we already have a match don't bother trying any more */
+ if (match == 2)
+ continue;
+ if (match == 0)
+ match = 1;
+ r = nc_match_single(gen, sub->base);
+ if (r == X509_V_OK)
+ match = 2;
+ else if (r != X509_V_ERR_PERMITTED_VIOLATION)
+ return r;
+ }
+
+ if (match == 1)
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ /* Excluded subtrees: must not match any of these */
+
+ for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
+ sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
+ if (gen->type != sub->base->type)
+ continue;
+ if (sub->minimum || sub->maximum)
+ return X509_V_ERR_SUBTREE_MINMAX;
+
+ r = nc_match_single(gen, sub->base);
+ if (r == X509_V_OK)
+ return X509_V_ERR_EXCLUDED_VIOLATION;
+ else if (r != X509_V_ERR_PERMITTED_VIOLATION)
+ return r;
+
+ }
+
+ return X509_V_OK;
+
+}
+
+static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
+{
+ switch (base->type) {
+ case GEN_DIRNAME:
+ return nc_dn(gen->d.directoryName, base->d.directoryName);
+
+ case GEN_DNS:
+ return nc_dns(gen->d.dNSName, base->d.dNSName);
+
+ case GEN_EMAIL:
+ return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
+
+ case GEN_URI:
+ return nc_uri(gen->d.uniformResourceIdentifier,
+ base->d.uniformResourceIdentifier);
+
+ default:
+ return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
+ }
+
+}
+
+/*
+ * directoryName name constraint matching. The canonical encoding of
+ * X509_NAME makes this comparison easy. It is matched if the subtree is a
+ * subset of the name.
+ */
+
+static int nc_dn(X509_NAME *nm, X509_NAME *base)
+{
+ /* Ensure canonical encodings are up to date. */
+ if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
+ return X509_V_ERR_OUT_OF_MEM;
+ if (base->modified && i2d_X509_NAME(base, NULL) < 0)
+ return X509_V_ERR_OUT_OF_MEM;
+ if (base->canon_enclen > nm->canon_enclen)
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ if (OPENSSL_memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ return X509_V_OK;
+}
+
+static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
+{
+ char *baseptr = (char *)base->data;
+ char *dnsptr = (char *)dns->data;
+ /* Empty matches everything */
+ if (!*baseptr)
+ return X509_V_OK;
+ /*
+ * Otherwise can add zero or more components on the left so compare RHS
+ * and if dns is longer and expect '.' as preceding character.
+ */
+ if (dns->length > base->length) {
+ dnsptr += dns->length - base->length;
+ if (*baseptr != '.' && dnsptr[-1] != '.')
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ }
+
+ if (OPENSSL_strcasecmp(baseptr, dnsptr))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ return X509_V_OK;
+
+}
+
+static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
+{
+ const char *baseptr = (char *)base->data;
+ const char *emlptr = (char *)eml->data;
+
+ const char *baseat = strchr(baseptr, '@');
+ const char *emlat = strchr(emlptr, '@');
+ if (!emlat)
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+ /* Special case: inital '.' is RHS match */
+ if (!baseat && (*baseptr == '.')) {
+ if (eml->length > base->length) {
+ emlptr += eml->length - base->length;
+ if (!OPENSSL_strcasecmp(baseptr, emlptr))
+ return X509_V_OK;
+ }
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ }
+
+ /* If we have anything before '@' match local part */
+
+ if (baseat) {
+ if (baseat != baseptr) {
+ if ((baseat - baseptr) != (emlat - emlptr))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ /* Case sensitive match of local part */
+ if (strncmp(baseptr, emlptr, emlat - emlptr))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ }
+ /* Position base after '@' */
+ baseptr = baseat + 1;
+ }
+ emlptr = emlat + 1;
+ /* Just have hostname left to match: case insensitive */
+ if (OPENSSL_strcasecmp(baseptr, emlptr))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ return X509_V_OK;
+
+}
+
+static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
+{
+ const char *baseptr = (char *)base->data;
+ const char *hostptr = (char *)uri->data;
+ const char *p = strchr(hostptr, ':');
+ int hostlen;
+ /* Check for foo:// and skip past it */
+ if (!p || (p[1] != '/') || (p[2] != '/'))
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+ hostptr = p + 3;
+
+ /* Determine length of hostname part of URI */
+
+ /* Look for a port indicator as end of hostname first */
+
+ p = strchr(hostptr, ':');
+ /* Otherwise look for trailing slash */
+ if (!p)
+ p = strchr(hostptr, '/');
+
+ if (!p)
+ hostlen = strlen(hostptr);
+ else
+ hostlen = p - hostptr;
+
+ if (hostlen == 0)
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+
+ /* Special case: inital '.' is RHS match */
+ if (*baseptr == '.') {
+ if (hostlen > base->length) {
+ p = hostptr + hostlen - base->length;
+ if (!OPENSSL_strncasecmp(p, baseptr, base->length))
+ return X509_V_OK;
+ }
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ }
+
+ if ((base->length != (int)hostlen)
+ || OPENSSL_strncasecmp(hostptr, baseptr, hostlen))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ return X509_V_OK;
+
+}
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