1 files changed, 282 insertions, 8 deletions

diff --git a/Cryptlib/OpenSSL/crypto/x509v3/v3_ncons.c b/Cryptlib/OpenSSL/crypto/x509v3/v3_ncons.c
index 24c1b662..b97ed271 100644
--- a/Cryptlib/OpenSSL/crypto/x509v3/v3_ncons.c
+++ b/Cryptlib/OpenSSL/crypto/x509v3/v3_ncons.c
@@ -63,16 +63,23 @@
 #include <openssl/conf.h>
 #include <openssl/x509v3.h>
 
-static void *v2i_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method,
+static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
                                   X509V3_CTX *ctx,
                                   STACK_OF(CONF_VALUE) *nval);
-static int i2r_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method, void *a, BIO *bp,
-                                int ind);
-static int do_i2r_name_constraints(X509V3_EXT_METHOD *method,
+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);
 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),
@@ -100,7 +107,7 @@ ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
 
-static void *v2i_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method,
+static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
                                   X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
 {
     int i;
@@ -147,8 +154,8 @@ static void *v2i_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method,
     return NULL;
 }
 
-static int i2r_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method,
-                                void *a, BIO *bp, int ind)
+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,
@@ -158,7 +165,7 @@ static int i2r_NAME_CONSTRAINTS(X509V3_EXT_METHOD *method,
     return 1;
 }
 
-static int do_i2r_name_constraints(X509V3_EXT_METHOD *method,
+static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
                                    STACK_OF(GENERAL_SUBTREE) *trees,
                                    BIO *bp, int ind, char *name)
 {
@@ -201,3 +208,270 @@ static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
         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_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;
+        }
+
+    }
+
+    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 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);
+
+    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 (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 (!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;
+
+}
+
+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;
+
+}