unsigned raw_serial_size;
unsigned raw_issuer_size;
const void *raw_issuer;
+ const void *raw_skid;
+ unsigned raw_skid_size;
+ bool expect_skid;
};
/*
}
EXPORT_SYMBOL_GPL(pkcs7_free_message);
+/*
+ * Check authenticatedAttributes are provided or not provided consistently.
+ */
+static int pkcs7_check_authattrs(struct pkcs7_message *msg)
+{
+ struct pkcs7_signed_info *sinfo;
+ bool want;
+
+ sinfo = msg->signed_infos;
+ if (sinfo->authattrs) {
+ want = true;
+ msg->have_authattrs = true;
+ }
+
+ for (sinfo = sinfo->next; sinfo; sinfo = sinfo->next)
+ if (!!sinfo->authattrs != want)
+ goto inconsistent;
+ return 0;
+
+inconsistent:
+ pr_warn("Inconsistently supplied authAttrs\n");
+ return -EINVAL;
+}
+
/**
* pkcs7_parse_message - Parse a PKCS#7 message
* @data: The raw binary ASN.1 encoded message to be parsed
goto out;
}
+ ret = pkcs7_check_authattrs(ctx->msg);
+ if (ret < 0)
+ goto out;
+
msg = ctx->msg;
ctx->msg = NULL;
case OID_sha256:
ctx->sinfo->sig.pkey_hash_algo = HASH_ALGO_SHA256;
break;
+ case OID_sha384:
+ ctx->sinfo->sig.pkey_hash_algo = HASH_ALGO_SHA384;
+ break;
+ case OID_sha512:
+ ctx->sinfo->sig.pkey_hash_algo = HASH_ALGO_SHA512;
+ break;
+ case OID_sha224:
+ ctx->sinfo->sig.pkey_hash_algo = HASH_ALGO_SHA224;
default:
printk("Unsupported digest algo: %u\n", ctx->last_oid);
return -ENOPKG;
return 0;
}
+/*
+ * We only support signed data [RFC2315 sec 9].
+ */
+int pkcs7_check_content_type(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs7_parse_context *ctx = context;
+
+ if (ctx->last_oid != OID_signed_data) {
+ pr_warn("Only support pkcs7_signedData type\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Note the SignedData version
+ */
+int pkcs7_note_signeddata_version(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs7_parse_context *ctx = context;
+ unsigned version;
+
+ if (vlen != 1)
+ goto unsupported;
+
+ ctx->msg->version = version = *(const u8 *)value;
+ switch (version) {
+ case 1:
+ /* PKCS#7 SignedData [RFC2315 sec 9.1]
+ * CMS ver 1 SignedData [RFC5652 sec 5.1]
+ */
+ break;
+ case 3:
+ /* CMS ver 3 SignedData [RFC2315 sec 5.1] */
+ break;
+ default:
+ goto unsupported;
+ }
+
+ return 0;
+
+unsupported:
+ pr_warn("Unsupported SignedData version\n");
+ return -EINVAL;
+}
+
+/*
+ * Note the SignerInfo version
+ */
+int pkcs7_note_signerinfo_version(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs7_parse_context *ctx = context;
+ unsigned version;
+
+ if (vlen != 1)
+ goto unsupported;
+
+ version = *(const u8 *)value;
+ switch (version) {
+ case 1:
+ /* PKCS#7 SignerInfo [RFC2315 sec 9.2]
+ * CMS ver 1 SignerInfo [RFC5652 sec 5.3]
+ */
+ if (ctx->msg->version != 1)
+ goto version_mismatch;
+ ctx->expect_skid = false;
+ break;
+ case 3:
+ /* CMS ver 3 SignerInfo [RFC2315 sec 5.3] */
+ if (ctx->msg->version == 1)
+ goto version_mismatch;
+ ctx->expect_skid = true;
+ break;
+ default:
+ goto unsupported;
+ }
+
+ return 0;
+
+unsupported:
+ pr_warn("Unsupported SignerInfo version\n");
+ return -EINVAL;
+version_mismatch:
+ pr_warn("SignedData-SignerInfo version mismatch\n");
+ return -EBADMSG;
+}
+
/*
* Extract a certificate and store it in the context.
*/
return 0;
}
+/*
+ * Note the content type.
+ */
+int pkcs7_note_content(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs7_parse_context *ctx = context;
+
+ if (ctx->last_oid != OID_data &&
+ ctx->last_oid != OID_msIndirectData) {
+ pr_warn("Unsupported data type %d\n", ctx->last_oid);
+ return -EINVAL;
+ }
+
+ ctx->msg->data_type = ctx->last_oid;
+ return 0;
+}
+
/*
* Extract the data from the message and store that and its content type OID in
* the context.
ctx->msg->data = value;
ctx->msg->data_len = vlen;
ctx->msg->data_hdrlen = hdrlen;
- ctx->msg->data_type = ctx->last_oid;
return 0;
}
/*
- * Parse authenticated attributes
+ * Parse authenticated attributes.
*/
int pkcs7_sig_note_authenticated_attr(void *context, size_t hdrlen,
unsigned char tag,
const void *value, size_t vlen)
{
struct pkcs7_parse_context *ctx = context;
+ struct pkcs7_signed_info *sinfo = ctx->sinfo;
+ enum OID content_type;
pr_devel("AuthAttr: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
switch (ctx->last_oid) {
+ case OID_contentType:
+ if (__test_and_set_bit(sinfo_has_content_type, &sinfo->aa_set))
+ goto repeated;
+ content_type = look_up_OID(value, vlen);
+ if (content_type != ctx->msg->data_type) {
+ pr_warn("Mismatch between global data type (%d) and sinfo %u (%d)\n",
+ ctx->msg->data_type, sinfo->index,
+ content_type);
+ return -EBADMSG;
+ }
+ return 0;
+
+ case OID_signingTime:
+ if (__test_and_set_bit(sinfo_has_signing_time, &sinfo->aa_set))
+ goto repeated;
+ /* Should we check that the signing time is consistent
+ * with the signer's X.509 cert?
+ */
+ return x509_decode_time(&sinfo->signing_time,
+ hdrlen, tag, value, vlen);
+
case OID_messageDigest:
+ if (__test_and_set_bit(sinfo_has_message_digest, &sinfo->aa_set))
+ goto repeated;
if (tag != ASN1_OTS)
return -EBADMSG;
- ctx->sinfo->msgdigest = value;
- ctx->sinfo->msgdigest_len = vlen;
+ sinfo->msgdigest = value;
+ sinfo->msgdigest_len = vlen;
+ return 0;
+
+ case OID_smimeCapabilites:
+ if (__test_and_set_bit(sinfo_has_smime_caps, &sinfo->aa_set))
+ goto repeated;
+ if (ctx->msg->data_type != OID_msIndirectData) {
+ pr_warn("S/MIME Caps only allowed with Authenticode\n");
+ return -EKEYREJECTED;
+ }
+ return 0;
+
+ /* Microsoft SpOpusInfo seems to be contain cont[0] 16-bit BE
+ * char URLs and cont[1] 8-bit char URLs.
+ *
+ * Microsoft StatementType seems to contain a list of OIDs that
+ * are also used as extendedKeyUsage types in X.509 certs.
+ */
+ case OID_msSpOpusInfo:
+ if (__test_and_set_bit(sinfo_has_ms_opus_info, &sinfo->aa_set))
+ goto repeated;
+ goto authenticode_check;
+ case OID_msStatementType:
+ if (__test_and_set_bit(sinfo_has_ms_statement_type, &sinfo->aa_set))
+ goto repeated;
+ authenticode_check:
+ if (ctx->msg->data_type != OID_msIndirectData) {
+ pr_warn("Authenticode AuthAttrs only allowed with Authenticode\n");
+ return -EKEYREJECTED;
+ }
+ /* I'm not sure how to validate these */
return 0;
default:
return 0;
}
+
+repeated:
+ /* We permit max one item per AuthenticatedAttribute and no repeats */
+ pr_warn("Repeated/multivalue AuthAttrs not permitted\n");
+ return -EKEYREJECTED;
}
/*
- * Note the set of auth attributes for digestion purposes [RFC2315 9.3]
+ * Note the set of auth attributes for digestion purposes [RFC2315 sec 9.3]
*/
int pkcs7_sig_note_set_of_authattrs(void *context, size_t hdrlen,
unsigned char tag,
const void *value, size_t vlen)
{
struct pkcs7_parse_context *ctx = context;
+ struct pkcs7_signed_info *sinfo = ctx->sinfo;
+
+ if (!test_bit(sinfo_has_content_type, &sinfo->aa_set) ||
+ !test_bit(sinfo_has_message_digest, &sinfo->aa_set) ||
+ (ctx->msg->data_type == OID_msIndirectData &&
+ !test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set))) {
+ pr_warn("Missing required AuthAttr\n");
+ return -EBADMSG;
+ }
+
+ if (ctx->msg->data_type != OID_msIndirectData &&
+ test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) {
+ pr_warn("Unexpected Authenticode AuthAttr\n");
+ return -EBADMSG;
+ }
/* We need to switch the 'CONT 0' to a 'SET OF' when we digest */
- ctx->sinfo->authattrs = value - (hdrlen - 1);
- ctx->sinfo->authattrs_len = vlen + (hdrlen - 1);
+ sinfo->authattrs = value - (hdrlen - 1);
+ sinfo->authattrs_len = vlen + (hdrlen - 1);
return 0;
}
return 0;
}
+/*
+ * Note the issuing cert's subjectKeyIdentifier
+ */
+int pkcs7_sig_note_skid(void *context, size_t hdrlen,
+ unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct pkcs7_parse_context *ctx = context;
+
+ pr_devel("SKID: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
+
+ ctx->raw_skid = value;
+ ctx->raw_skid_size = vlen;
+ return 0;
+}
+
/*
* Note the signature data
*/
struct pkcs7_signed_info *sinfo = ctx->sinfo;
struct asymmetric_key_id *kid;
+ if (ctx->msg->data_type == OID_msIndirectData && !sinfo->authattrs) {
+ pr_warn("Authenticode requires AuthAttrs\n");
+ return -EBADMSG;
+ }
+
/* Generate cert issuer + serial number key ID */
- kid = asymmetric_key_generate_id(ctx->raw_serial,
- ctx->raw_serial_size,
- ctx->raw_issuer,
- ctx->raw_issuer_size);
+ if (!ctx->expect_skid) {
+ kid = asymmetric_key_generate_id(ctx->raw_serial,
+ ctx->raw_serial_size,
+ ctx->raw_issuer,
+ ctx->raw_issuer_size);
+ } else {
+ kid = asymmetric_key_generate_id(ctx->raw_skid,
+ ctx->raw_skid_size,
+ "", 0);
+ }
if (IS_ERR(kid))
return PTR_ERR(kid);
+ pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data);
+
sinfo->signing_cert_id = kid;
sinfo->index = ++ctx->sinfo_index;
*ctx->ppsinfo = sinfo;
Code Review / kvmfornfv.git / blobdiff