Work towards supporting Cryptographic Message Syntax (CMS) in libcrypto.

Cryptographic Message Syntax (CMS) is a standard for cryptographically
protecting messages, as defined in RFC 5652. It is derived from PKCS #7
version 1.5 and utilises various ASN.1 structures, making it complex and
fairly heavyweight. Various protocols - including RPKI (RFC 6480) - have
been built on top of it, which means it is necessary to support CMS, in
order to support RPKI.

This imports around 6,000 lines of code from OpenSSL 1.1.1, which is still
under the original OpenSSL license. Further work will occur in tree.

Requested by and discussed with many.

ok deraadt@ tb@

1 files changed, 88 insertions, 0 deletions

diff --git a/lib/libcrypto/cms/cms_io.c b/lib/libcrypto/cms/cms_io.c
new file mode 100644
index 00000000000..d18f980a973
--- /dev/null
+++ b/lib/libcrypto/cms/cms_io.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2008-2016 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 <openssl/asn1t.h>
+#include <openssl/x509.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/cms.h>
+#include "cms_lcl.h"
+
+int CMS_stream(unsigned char ***boundary, CMS_ContentInfo *cms)
+{
+    ASN1_OCTET_STRING **pos;
+    pos = CMS_get0_content(cms);
+    if (pos == NULL)
+        return 0;
+    if (*pos == NULL)
+        *pos = ASN1_OCTET_STRING_new();
+    if (*pos != NULL) {
+        (*pos)->flags |= ASN1_STRING_FLAG_NDEF;
+        (*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
+        *boundary = &(*pos)->data;
+        return 1;
+    }
+    CMSerr(CMS_F_CMS_STREAM, ERR_R_MALLOC_FAILURE);
+    return 0;
+}
+
+CMS_ContentInfo *d2i_CMS_bio(BIO *bp, CMS_ContentInfo **cms)
+{
+    return ASN1_item_d2i_bio(ASN1_ITEM_rptr(CMS_ContentInfo), bp, cms);
+}
+
+int i2d_CMS_bio(BIO *bp, CMS_ContentInfo *cms)
+{
+    return ASN1_item_i2d_bio(ASN1_ITEM_rptr(CMS_ContentInfo), bp, cms);
+}
+
+IMPLEMENT_PEM_rw_const(CMS, CMS_ContentInfo, PEM_STRING_CMS, CMS_ContentInfo)
+
+BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms)
+{
+    return BIO_new_NDEF(out, (ASN1_VALUE *)cms,
+                        ASN1_ITEM_rptr(CMS_ContentInfo));
+}
+
+/* CMS wrappers round generalised stream and MIME routines */
+
+int i2d_CMS_bio_stream(BIO *out, CMS_ContentInfo *cms, BIO *in, int flags)
+{
+    return i2d_ASN1_bio_stream(out, (ASN1_VALUE *)cms, in, flags,
+                               ASN1_ITEM_rptr(CMS_ContentInfo));
+}
+
+int PEM_write_bio_CMS_stream(BIO *out, CMS_ContentInfo *cms, BIO *in,
+                             int flags)
+{
+    return PEM_write_bio_ASN1_stream(out, (ASN1_VALUE *)cms, in, flags,
+                                     "CMS", ASN1_ITEM_rptr(CMS_ContentInfo));
+}
+
+int SMIME_write_CMS(BIO *bio, CMS_ContentInfo *cms, BIO *data, int flags)
+{
+    STACK_OF(X509_ALGOR) *mdalgs;
+    int ctype_nid = OBJ_obj2nid(cms->contentType);
+    int econt_nid = OBJ_obj2nid(CMS_get0_eContentType(cms));
+    if (ctype_nid == NID_pkcs7_signed)
+        mdalgs = cms->d.signedData->digestAlgorithms;
+    else
+        mdalgs = NULL;
+
+    return SMIME_write_ASN1(bio, (ASN1_VALUE *)cms, data, flags,
+                            ctype_nid, econt_nid, mdalgs,
+                            ASN1_ITEM_rptr(CMS_ContentInfo));
+}
+
+CMS_ContentInfo *SMIME_read_CMS(BIO *bio, BIO **bcont)
+{
+    return (CMS_ContentInfo *)SMIME_read_ASN1(bio, bcont,
+                                              ASN1_ITEM_rptr
+                                              (CMS_ContentInfo));
+}