import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/certdb/certv3.c

@@ -0,0 +1,222 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Code for dealing with X509.V3 extensions.
+ */
+
+#include "cert.h"
+#include "secitem.h"
+#include "secoid.h"
+#include "secder.h"
+#include "secasn1.h"
+#include "certxutl.h"
+#include "secerr.h"
+
+SECStatus
+CERT_FindCertExtensionByOID(CERTCertificate *cert, SECItem *oid, SECItem *value)
+{
+    return (cert_FindExtensionByOID(cert->extensions, oid, value));
+}
+
+SECStatus
+CERT_FindCertExtension(const CERTCertificate *cert, int tag, SECItem *value)
+{
+    return (cert_FindExtension(cert->extensions, tag, value));
+}
+
+static void
+SetExts(void *object, CERTCertExtension **exts)
+{
+    CERTCertificate *cert = (CERTCertificate *)object;
+
+    cert->extensions = exts;
+    DER_SetUInteger(cert->arena, &(cert->version), SEC_CERTIFICATE_VERSION_3);
+}
+
+void *
+CERT_StartCertExtensions(CERTCertificate *cert)
+{
+    return (cert_StartExtensions((void *)cert, cert->arena, SetExts));
+}
+
+/*
+ * get the value of the Netscape Certificate Type Extension
+ */
+SECStatus
+CERT_FindNSCertTypeExtension(CERTCertificate *cert, SECItem *retItem)
+{
+
+    return (CERT_FindBitStringExtension(
+        cert->extensions, SEC_OID_NS_CERT_EXT_CERT_TYPE, retItem));
+}
+
+/*
+ * get the value of a string type extension
+ */
+char *
+CERT_FindNSStringExtension(CERTCertificate *cert, int oidtag)
+{
+    SECItem wrapperItem, tmpItem = { siBuffer, 0 };
+    SECStatus rv;
+    PLArenaPool *arena = NULL;
+    char *retstring = NULL;
+
+    wrapperItem.data = NULL;
+    tmpItem.data = NULL;
+
+    arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+
+    if (!arena) {
+        goto loser;
+    }
+
+    rv = cert_FindExtension(cert->extensions, oidtag, &wrapperItem);
+    if (rv != SECSuccess) {
+        goto loser;
+    }
+
+    rv = SEC_QuickDERDecodeItem(
+        arena, &tmpItem, SEC_ASN1_GET(SEC_IA5StringTemplate), &wrapperItem);
+
+    if (rv != SECSuccess) {
+        goto loser;
+    }
+
+    retstring = (char *)PORT_Alloc(tmpItem.len + 1);
+    if (retstring == NULL) {
+        goto loser;
+    }
+
+    PORT_Memcpy(retstring, tmpItem.data, tmpItem.len);
+    retstring[tmpItem.len] = '\0';
+
+loser:
+    if (arena) {
+        PORT_FreeArena(arena, PR_FALSE);
+    }
+
+    if (wrapperItem.data) {
+        PORT_Free(wrapperItem.data);
+    }
+
+    return (retstring);
+}
+
+/*
+ * get the value of the X.509 v3 Key Usage Extension
+ */
+SECStatus
+CERT_FindKeyUsageExtension(CERTCertificate *cert, SECItem *retItem)
+{
+
+    return (CERT_FindBitStringExtension(cert->extensions,
+                                        SEC_OID_X509_KEY_USAGE, retItem));
+}
+
+/*
+ * get the value of the X.509 v3 Key Usage Extension
+ */
+SECStatus
+CERT_FindSubjectKeyIDExtension(CERTCertificate *cert, SECItem *retItem)
+{
+
+    SECStatus rv;
+    SECItem encodedValue = { siBuffer, NULL, 0 };
+    SECItem decodedValue = { siBuffer, NULL, 0 };
+
+    rv = cert_FindExtension(cert->extensions, SEC_OID_X509_SUBJECT_KEY_ID,
+                            &encodedValue);
+    if (rv == SECSuccess) {
+        PORTCheapArenaPool tmpArena;
+        PORT_InitCheapArena(&tmpArena, DER_DEFAULT_CHUNKSIZE);
+        rv = SEC_QuickDERDecodeItem(&tmpArena.arena, &decodedValue,
+                                    SEC_ASN1_GET(SEC_OctetStringTemplate),
+                                    &encodedValue);
+        if (rv == SECSuccess) {
+            rv = SECITEM_CopyItem(NULL, retItem, &decodedValue);
+        }
+        PORT_DestroyCheapArena(&tmpArena);
+    }
+    SECITEM_FreeItem(&encodedValue, PR_FALSE);
+    return rv;
+}
+
+SECStatus
+CERT_FindBasicConstraintExten(CERTCertificate *cert,
+                              CERTBasicConstraints *value)
+{
+    SECItem encodedExtenValue;
+    SECStatus rv;
+
+    encodedExtenValue.data = NULL;
+    encodedExtenValue.len = 0;
+
+    rv = cert_FindExtension(cert->extensions, SEC_OID_X509_BASIC_CONSTRAINTS,
+                            &encodedExtenValue);
+    if (rv != SECSuccess) {
+        return (rv);
+    }
+
+    rv = CERT_DecodeBasicConstraintValue(value, &encodedExtenValue);
+
+    /* free the raw extension data */
+    PORT_Free(encodedExtenValue.data);
+    encodedExtenValue.data = NULL;
+
+    return (rv);
+}
+
+CERTAuthKeyID *
+CERT_FindAuthKeyIDExten(PLArenaPool *arena, CERTCertificate *cert)
+{
+    SECItem encodedExtenValue;
+    SECStatus rv;
+    CERTAuthKeyID *ret;
+
+    encodedExtenValue.data = NULL;
+    encodedExtenValue.len = 0;
+
+    rv = cert_FindExtension(cert->extensions, SEC_OID_X509_AUTH_KEY_ID,
+                            &encodedExtenValue);
+    if (rv != SECSuccess) {
+        return (NULL);
+    }
+
+    ret = CERT_DecodeAuthKeyID(arena, &encodedExtenValue);
+
+    PORT_Free(encodedExtenValue.data);
+    encodedExtenValue.data = NULL;
+
+    return (ret);
+}
+
+SECStatus
+CERT_CheckCertUsage(CERTCertificate *cert, unsigned char usage)
+{
+    SECItem keyUsage;
+    SECStatus rv;
+
+    /* There is no extension, v1 or v2 certificate */
+    if (cert->extensions == NULL) {
+        return (SECSuccess);
+    }
+
+    keyUsage.data = NULL;
+
+    /* This code formerly ignored the Key Usage extension if it was
+    ** marked non-critical.  That was wrong.  Since we do understand it,
+    ** we are obligated to honor it, whether or not it is critical.
+    */
+    rv = CERT_FindKeyUsageExtension(cert, &keyUsage);
+    if (rv == SECFailure) {
+        rv = (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND) ? SECSuccess
+                                                                : SECFailure;
+    } else if (!(keyUsage.data[0] & usage)) {
+        PORT_SetError(SEC_ERROR_CERT_USAGES_INVALID);
+        rv = SECFailure;
+    }
+    PORT_Free(keyUsage.data);
+    return (rv);
+}