-/* 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).
+/*
+ * Copyright 2003-2018 The OpenSSL Project Authors. All Rights Reserved.
*
+ * Licensed under the OpenSSL license (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
*/
-
+#include "internal/cryptlib.h"
+#include "internal/numbers.h"
#include <stdio.h>
-#include "cryptlib.h"
+#include "internal/asn1_int.h"
#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>
+#include <openssl/bn.h>
+
+#include "internal/x509_int.h"
+#include "ext_dat.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);
+ 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, char *name);
+ 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_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);
+static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *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
+ 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_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_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)
+/*
+ * We cannot use strncasecmp here because that applies locale specific rules.
+ * For example in Turkish 'I' is not the uppercase character for 'i'. We need to
+ * do a simple ASCII case comparison ignoring the locale (that is why we use
+ * numeric constants below).
+ */
+static int ia5ncasecmp(const char *s1, const char *s2, size_t n)
+{
+ for (; n > 0; n--, s1++, s2++) {
+ if (*s1 != *s2) {
+ unsigned char c1 = (unsigned char)*s1, c2 = (unsigned char)*s2;
+
+ /* Convert to lower case */
+ if (c1 >= 0x41 /* A */ && c1 <= 0x5A /* Z */)
+ c1 += 0x20;
+ if (c2 >= 0x41 /* A */ && c2 <= 0x5A /* Z */)
+ c2 += 0x20;
+
+ if (c1 == c2)
+ continue;
+
+ if (c1 < c2)
+ return -1;
+
+ /* c1 > c2 */
+ return 1;
+ } else if (*s1 == 0) {
+ /* If we get here we know that *s2 == 0 too */
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+static int ia5casecmp(const char *s1, const char *s2)
+{
+ return ia5ncasecmp(s1, s2, SIZE_MAX);
+}
+
static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
- X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
- {
- int 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
- {
- X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, 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:
- X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
- err:
- if (ncons)
- NAME_CONSTRAINTS_free(ncons);
- if (sub)
- GENERAL_SUBTREE_free(sub);
-
- return NULL;
- }
-
-
-
+ X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
+{
+ int 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 == NULL)
+ 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) == 0 && val->name[9]) {
+ ptree = &ncons->permittedSubtrees;
+ tval.name = val->name + 10;
+ } else if (strncmp(val->name, "excluded", 8) == 0 && val->name[8]) {
+ ptree = &ncons->excludedSubtrees;
+ tval.name = val->name + 9;
+ } else {
+ X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
+ goto err;
+ }
+ tval.value = val->value;
+ sub = GENERAL_SUBTREE_new();
+ if (sub == NULL)
+ goto memerr;
+ if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
+ goto err;
+ if (*ptree == NULL)
+ *ptree = sk_GENERAL_SUBTREE_new_null();
+ if (*ptree == NULL || !sk_GENERAL_SUBTREE_push(*ptree, sub))
+ goto memerr;
+ sub = NULL;
+ }
+
+ return ncons;
+
+ memerr:
+ X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
+ err:
+ NAME_CONSTRAINTS_free(ncons);
+ 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;
- }
+ 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, char *name)
- {
- GENERAL_SUBTREE *tree;
- int 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);
- tree = sk_GENERAL_SUBTREE_value(trees, i);
- BIO_puts(bp, "\n");
- }
- return 1;
- }
+ STACK_OF(GENERAL_SUBTREE) *trees,
+ BIO *bp, int ind, const char *name)
+{
+ GENERAL_SUBTREE *tree;
+ int 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.
+{
+ 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;
+}
+
+#define NAME_CHECK_MAX (1 << 20)
+
+static int add_lengths(int *out, int a, int b)
+{
+ /* sk_FOO_num(NULL) returns -1 but is effectively 0 when iterating. */
+ if (a < 0)
+ a = 0;
+ if (b < 0)
+ b = 0;
+
+ if (a > INT_MAX - b)
+ return 0;
+ *out = a + b;
+ 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_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
* X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad 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;
- X509_NAME *nm;
-
- nm = X509_get_subject_name(x);
-
- 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;
- }
-
- }
+{
+ int r, i, name_count, constraint_count;
+ 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.
+ */
+ if (!add_lengths(&name_count, X509_NAME_entry_count(nm),
+ sk_GENERAL_NAME_num(x->altname))
+ || !add_lengths(&constraint_count,
+ sk_GENERAL_SUBTREE_num(nc->permittedSubtrees),
+ sk_GENERAL_SUBTREE_num(nc->excludedSubtrees))
+ || (name_count > 0 && constraint_count > NAME_CHECK_MAX / name_count))
+ 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;;) {
+ const 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 (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
+ GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
+ r = nc_match(gen, nc);
+ if (r != X509_V_OK)
+ return r;
+ }
+
+ return X509_V_OK;
+
+}
+
+static int cn2dnsid(ASN1_STRING *cn, unsigned char **dnsid, size_t *idlen)
+{
+ int utf8_length;
+ unsigned char *utf8_value;
+ int i;
+ int isdnsname = 0;
+
+ /* Don't leave outputs uninitialized */
+ *dnsid = NULL;
+ *idlen = 0;
+
+ /*-
+ * Per RFC 6125, DNS-IDs representing internationalized domain names appear
+ * in certificates in A-label encoded form:
+ *
+ * https://tools.ietf.org/html/rfc6125#section-6.4.2
+ *
+ * The same applies to CNs which are intended to represent DNS names.
+ * However, while in the SAN DNS-IDs are IA5Strings, as CNs they may be
+ * needlessly encoded in 16-bit Unicode. We perform a conversion to UTF-8
+ * to ensure that we get an ASCII representation of any CNs that are
+ * representable as ASCII, but just not encoded as ASCII. The UTF-8 form
+ * may contain some non-ASCII octets, and that's fine, such CNs are not
+ * valid legacy DNS names.
+ *
+ * Note, 'int' is the return type of ASN1_STRING_to_UTF8() so that's what
+ * we must use for 'utf8_length'.
+ */
+ if ((utf8_length = ASN1_STRING_to_UTF8(&utf8_value, cn)) < 0)
+ return X509_V_ERR_OUT_OF_MEM;
+
+ /*
+ * Some certificates have had names that include a *trailing* NUL byte.
+ * Remove these harmless NUL characters. They would otherwise yield false
+ * alarms with the following embedded NUL check.
+ */
+ while (utf8_length > 0 && utf8_value[utf8_length - 1] == '\0')
+ --utf8_length;
+
+ /* Reject *embedded* NULs */
+ if ((size_t)utf8_length != strlen((char *)utf8_value)) {
+ OPENSSL_free(utf8_value);
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+ }
+
+ /*
+ * XXX: Deviation from strict DNS name syntax, also check names with '_'
+ * Check DNS name syntax, any '-' or '.' must be internal,
+ * and on either side of each '.' we can't have a '-' or '.'.
+ *
+ * If the name has just one label, we don't consider it a DNS name. This
+ * means that "CN=sometld" cannot be precluded by DNS name constraints, but
+ * that is not a problem.
+ */
+ for (i = 0; i < utf8_length; ++i) {
+ unsigned char c = utf8_value[i];
+
+ if ((c >= 'a' && c <= 'z')
+ || (c >= 'A' && c <= 'Z')
+ || (c >= '0' && c <= '9')
+ || c == '_')
+ continue;
+
+ /* Dot and hyphen cannot be first or last. */
+ if (i > 0 && i < utf8_length - 1) {
+ if (c == '-')
+ continue;
+ /*
+ * Next to a dot the preceding and following characters must not be
+ * another dot or a hyphen. Otherwise, record that the name is
+ * plausible, since it has two or more labels.
+ */
+ if (c == '.'
+ && utf8_value[i + 1] != '.'
+ && utf8_value[i - 1] != '-'
+ && utf8_value[i + 1] != '-') {
+ isdnsname = 1;
+ continue;
+ }
+ }
+ isdnsname = 0;
+ break;
+ }
+
+ if (isdnsname) {
+ *dnsid = utf8_value;
+ *idlen = (size_t)utf8_length;
+ return X509_V_OK;
+ }
+ OPENSSL_free(utf8_value);
+ return X509_V_OK;
+}
+
+/*
+ * Check CN against DNS-ID name constraints.
+ */
+int NAME_CONSTRAINTS_check_CN(X509 *x, NAME_CONSTRAINTS *nc)
+{
+ int r, i;
+ X509_NAME *nm = X509_get_subject_name(x);
+ ASN1_STRING stmp;
+ GENERAL_NAME gntmp;
+
+ stmp.flags = 0;
+ stmp.type = V_ASN1_IA5STRING;
+ gntmp.type = GEN_DNS;
+ gntmp.d.dNSName = &stmp;
+
+ /* Process any commonName attributes in subject name */
+
+ for (i = -1;;) {
+ X509_NAME_ENTRY *ne;
+ ASN1_STRING *cn;
+ unsigned char *idval;
+ size_t idlen;
+
+ i = X509_NAME_get_index_by_NID(nm, NID_commonName, i);
+ if (i == -1)
+ break;
+ ne = X509_NAME_get_entry(nm, i);
+ cn = X509_NAME_ENTRY_get_data(ne);
+
+ /* Only process attributes that look like host names */
+ if ((r = cn2dnsid(cn, &idval, &idlen)) != X509_V_OK)
+ return r;
+ if (idlen == 0)
+ continue;
+
+ stmp.length = idlen;
+ stmp.data = idval;
+ r = nc_match(&gntmp, nc);
+ OPENSSL_free(idval);
+ if (r != X509_V_OK)
+ return r;
+ }
+ return X509_V_OK;
+}
+
+/*
+ * Return nonzero if the GeneralSubtree has valid 'minimum' field
+ * (must be absent or 0) and valid 'maximum' field (must be absent).
+ */
+static int nc_minmax_valid(GENERAL_SUBTREE *sub) {
+ BIGNUM *bn = NULL;
+ int ok = 1;
- for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
- {
- GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
- r = nc_match(gen, nc);
- if (r != X509_V_OK)
- return r;
- }
+ if (sub->maximum)
+ ok = 0;
- return X509_V_OK;
+ if (sub->minimum) {
+ bn = ASN1_INTEGER_to_BN(sub->minimum, NULL);
+ if (bn == NULL || !BN_is_zero(bn))
+ ok = 0;
+ BN_free(bn);
+ }
- }
+ return ok;
+}
static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
- {
- GENERAL_SUBTREE *sub;
- int i, r, match = 0;
-
- /* 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;
-
- }
+{
+ GENERAL_SUBTREE *sub;
+ int i, r, match = 0;
+
+ /*
+ * 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 (!nc_minmax_valid(sub))
+ 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 (!nc_minmax_valid(sub))
+ 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);
+{
+ 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_DNS:
- return nc_dns(gen->d.dNSName, base->d.dNSName);
+ case GEN_EMAIL:
+ return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
- case GEN_EMAIL:
- return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
+ case GEN_URI:
+ return nc_uri(gen->d.uniformResourceIdentifier,
+ base->d.uniformResourceIdentifier);
- case GEN_URI:
- return nc_uri(gen->d.uniformResourceIdentifier,
- base->d.uniformResourceIdentifier);
+ case GEN_IPADD:
+ return nc_ip(gen->d.iPAddress, base->d.iPAddress);
- default:
- return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
- }
+ 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.
+/*
+ * 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)
- {
- if (base->canon_enclen > nm->canon_enclen)
- return X509_V_ERR_PERMITTED_VIOLATION;
- if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
- return X509_V_ERR_PERMITTED_VIOLATION;
- return X509_V_OK;
- }
+{
+ /* 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 (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 (dnsptr[-1] != '.')
- return X509_V_ERR_PERMITTED_VIOLATION;
- }
-
- if (strcasecmp(baseptr, dnsptr))
- return X509_V_ERR_PERMITTED_VIOLATION;
-
- return X509_V_OK;
-
- }
+{
+ 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 (ia5casecmp(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 (!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 (strcasecmp(baseptr, emlptr))
- return X509_V_ERR_PERMITTED_VIOLATION;
-
- return X509_V_OK;
-
- }
+{
+ 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: initial '.' is RHS match */
+ if (!baseat && (*baseptr == '.')) {
+ if (eml->length > base->length) {
+ emlptr += eml->length - base->length;
+ if (ia5casecmp(baseptr, emlptr) == 0)
+ 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 (ia5casecmp(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 (!strncasecmp(p, baseptr, base->length))
- return X509_V_OK;
- }
- return X509_V_ERR_PERMITTED_VIOLATION;
- }
-
- if ((base->length != (int)hostlen) || strncasecmp(hostptr, baseptr, hostlen))
- return X509_V_ERR_PERMITTED_VIOLATION;
-
- return X509_V_OK;
-
- }
+{
+ 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: initial '.' is RHS match */
+ if (*baseptr == '.') {
+ if (hostlen > base->length) {
+ p = hostptr + hostlen - base->length;
+ if (ia5ncasecmp(p, baseptr, base->length) == 0)
+ return X509_V_OK;
+ }
+ return X509_V_ERR_PERMITTED_VIOLATION;
+ }
+
+ if ((base->length != (int)hostlen)
+ || ia5ncasecmp(hostptr, baseptr, hostlen))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ return X509_V_OK;
+
+}
+
+static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base)
+{
+ int hostlen, baselen, i;
+ unsigned char *hostptr, *baseptr, *maskptr;
+ hostptr = ip->data;
+ hostlen = ip->length;
+ baseptr = base->data;
+ baselen = base->length;
+
+ /* Invalid if not IPv4 or IPv6 */
+ if (!((hostlen == 4) || (hostlen == 16)))
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+ if (!((baselen == 8) || (baselen == 32)))
+ return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+
+ /* Do not match IPv4 with IPv6 */
+ if (hostlen * 2 != baselen)
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ maskptr = base->data + hostlen;
+
+ /* Considering possible not aligned base ipAddress */
+ /* Not checking for wrong mask definition: i.e.: 255.0.255.0 */
+ for (i = 0; i < hostlen; i++)
+ if ((hostptr[i] & maskptr[i]) != (baseptr[i] & maskptr[i]))
+ return X509_V_ERR_PERMITTED_VIOLATION;
+
+ return X509_V_OK;
+
+}
projects / openssl.git / blobdiff