Support the TLS Feature (aka Must Staple) X.509v3 extension (RFC7633).

Signed-off-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Dr. Stephen Henson <steve@openssl.org>

GH: #495, MR: #1435

1 files changed, 186 insertions, 0 deletions

diff --git a/crypto/x509v3/v3_tlsf.c b/crypto/x509v3/v3_tlsf.c
new file mode 100644
index 0000000000..700546f6a6
--- /dev/null
+++ b/crypto/x509v3/v3_tlsf.c
@@ -0,0 +1,186 @@
+/* v3_tlsf.c */
+/*
+ * Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2015.
+ */
+/* ====================================================================
+ * Copyright (c) 2015 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 "internal/cryptlib.h"
+#include "internal/o_str.h"
+#include <openssl/asn1t.h>
+#include <openssl/conf.h>
+#include <openssl/x509v3.h>
+#include "ext_dat.h"
+
+static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
+                                             TLS_FEATURE *tls_feature,
+                                             STACK_OF(CONF_VALUE) *ext_list);
+static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
+                                    X509V3_CTX *ctx,
+                                    STACK_OF(CONF_VALUE) *nval);
+
+ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
+        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
+static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
+
+IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
+
+const X509V3_EXT_METHOD v3_tls_feature = {
+    NID_tlsfeature, 0,
+    ASN1_ITEM_ref(TLS_FEATURE),
+    0, 0, 0, 0,
+    0, 0,
+    (X509V3_EXT_I2V)i2v_TLS_FEATURE,
+    (X509V3_EXT_V2I)v2i_TLS_FEATURE,
+    0, 0,
+    NULL
+};
+
+
+typedef struct {
+    long num;
+    const char *name;
+} TLS_FEATURE_NAME;
+
+static TLS_FEATURE_NAME tls_feature_tbl[] = {
+    { 5, "status_request" },
+    { 17, "status_request_v2" }
+};
+
+/*
+ * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
+ * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
+ * used by the CONF library to represent a multi-valued extension.  ext_list is
+ * returned.
+ */
+static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
+                                             TLS_FEATURE *tls_feature,
+                                             STACK_OF(CONF_VALUE) *ext_list)
+{
+    int i;
+    size_t j;
+    ASN1_INTEGER *ai;
+    long tlsextid;
+    for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
+        ai = sk_ASN1_INTEGER_value(tls_feature, i);
+        tlsextid = ASN1_INTEGER_get(ai);
+        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
+            if (tlsextid == tls_feature_tbl[j].num)
+                break;
+        if (j < OSSL_NELEM(tls_feature_tbl))
+            X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
+        else
+            X509V3_add_value_int(NULL, ai, &ext_list);
+    }
+    return ext_list;
+}
+
+/*
+ * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
+ * structure, which is returned if the conversion is successful.  In case of
+ * error, NULL is returned.
+ */
+static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
+                                    X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
+{
+    TLS_FEATURE *tlsf;
+    char *extval, *endptr;
+    ASN1_INTEGER *ai;
+    CONF_VALUE *val;
+    int i;
+    size_t j;
+    long tlsextid;
+
+    if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
+        X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+
+    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
+        val = sk_CONF_VALUE_value(nval, i);
+        if (val->value)
+            extval = val->value;
+        else
+            extval = val->name;
+
+        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
+            if (OPENSSL_strcasecmp(extval, tls_feature_tbl[j].name) == 0)
+                break;
+        if (j < OSSL_NELEM(tls_feature_tbl))
+            tlsextid = tls_feature_tbl[j].num;
+        else {
+            tlsextid = strtol(extval, &endptr, 10);
+            if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
+                (tlsextid > 65535)) {
+                X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
+                X509V3_conf_err(val);
+                goto err;
+            }
+        }
+
+        ai = ASN1_INTEGER_new();
+        if (ai == NULL) {
+            X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+        ASN1_INTEGER_set(ai, tlsextid);
+        sk_ASN1_INTEGER_push(tlsf, ai);
+    }
+    return tlsf;
+
+ err:
+    sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
+    return NULL;
+}