Upgrade openssl from 1.1.0e to 1.1.1b, with source code. 4.0.78

trunk/3rdparty/openssl-1.1-fit/crypto/x509v3/v3_ncons.c

@@ -0,0 +1,675 @@
+/*
+ * 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 "internal/asn1_int.h"
+#include <openssl/asn1t.h>
+#include <openssl/conf.h>
+#include <openssl/x509v3.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);
+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);
+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
+};
+
+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)
+
+/*
+ * 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 == 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;
+}
+
+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;
+    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;
+}
+
+#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_EXCLUDED_VIOLATION: Excluded subtree violation.
+ *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
+ *  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, 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;
+}
+
+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;
+
+}
+
+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);
+
+    case GEN_IPADD:
+        return nc_ip(gen->d.iPAddress, base->d.iPAddress);
+
+    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 (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 (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: 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: 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;
+
+}