a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/*
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * This program is free software; you can redistribute it and/or
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * modify it under the terms of the GNU General Public License as
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * published by the Free Software Foundation; either version 2 of the
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * License, or any later version.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * This program is distributed in the hope that it will be useful, but
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * WITHOUT ANY WARRANTY; without even the implied warranty of
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * General Public License for more details.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * You should have received a copy of the GNU General Public License
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * along with this program; if not, write to the Free Software
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncFILE_LICENCE ( GPL2_OR_LATER );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/** @file
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Cryptographic Message Syntax (PKCS #7)
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * The format of CMS messages is defined in RFC 5652.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <stdint.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <string.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <time.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <errno.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <ipxe/asn1.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <ipxe/x509.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <ipxe/malloc.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <ipxe/uaccess.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#include <ipxe/cms.h>
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/* Disambiguate the various error causes */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EACCES_NON_SIGNING \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EACCES_NON_SIGNING )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EACCES_NON_SIGNING \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EACCES, 0x01, "Not a signing certificate" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EACCES_NON_CODE_SIGNING \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EACCES_NON_CODE_SIGNING )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EACCES_NON_CODE_SIGNING \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EACCES, 0x02, "Not a code-signing certificate" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EACCES_WRONG_NAME \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EACCES_WRONG_NAME )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EACCES_WRONG_NAME \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EACCES, 0x04, "Incorrect certificate name" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EACCES_NO_SIGNATURES \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EACCES_NO_SIGNATURES )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EACCES_NO_SIGNATURES \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EACCES, 0x05, "No signatures present" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINVAL_DIGEST \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EINVAL_DIGEST )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EINVAL_DIGEST \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EINVAL, 0x01, "Not a digest algorithm" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINVAL_PUBKEY \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_EINVAL_PUBKEY )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_EINVAL_PUBKEY \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_EINVAL, 0x02, "Not a public-key algorithm" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define ENOTSUP_SIGNEDDATA \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_error ( EINFO_ENOTSUP_SIGNEDDATA )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync#define EINFO_ENOTSUP_SIGNEDDATA \
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync __einfo_uniqify ( EINFO_ENOTSUP, 0x01, "Not a digital signature" )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/** "pkcs7-signedData" object identifier */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic uint8_t oid_signeddata[] = { ASN1_OID_SIGNEDDATA };
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/** "pkcs7-signedData" object identifier cursor */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic struct asn1_cursor oid_signeddata_cursor =
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync ASN1_OID_CURSOR ( oid_signeddata );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature content type
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_content_type ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter contentType */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_OID );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Check OID is pkcs7-signedData */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( asn1_compare ( &cursor, &oid_signeddata_cursor ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p does not contain signedData:\n", sig );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -ENOTSUP_SIGNEDDATA;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p contains signedData\n", sig );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature certificate list
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_certificates ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter certificates */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_EXPLICIT_TAG ( 0 ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Add each certificate */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync while ( cursor.len ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Add certificate to chain */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = x509_append_raw ( sig->certificates, cursor.data,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cursor.len ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p could not append certificate: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, strerror ( rc) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, cursor.data, cursor.len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cert = x509_last ( sig->certificates );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p found certificate %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, cert->subject.name );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Move to next certificate */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Identify CMS signature certificate by issuer and serial number
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v issuer Issuer
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v serial Serial number
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret cert X.509 certificate, or NULL if not found
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic struct x509_certificate *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsynccms_find_issuer_serial ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *issuer,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *serial ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_link *link;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Scan through certificate list */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync list_for_each_entry ( link, &sig->certificates->links, list ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Check issuer and serial number */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cert = link->cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( asn1_compare ( issuer, &cert->issuer.raw ) == 0 ) &&
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync ( asn1_compare ( serial, &cert->serial.raw ) == 0 ) )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return NULL;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature signer identifier
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information to fill in
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_signer_identifier ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor serial;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor issuer;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter issuerAndSerialNumber */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_SEQUENCE );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Identify issuer */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &issuer, &cursor, sizeof ( issuer ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = asn1_shrink ( &issuer, ASN1_SEQUENCE ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not locate issuer: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p issuer is:\n", sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, issuer.data, issuer.len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Identify serialNumber */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &serial, &cursor, sizeof ( serial ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = asn1_shrink ( &serial, ASN1_INTEGER ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not locate serialNumber: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p serial number is:\n", sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, serial.data, serial.len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Identify certificate */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cert = cms_find_issuer_serial ( sig, &issuer, &serial );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! cert ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not identify signer's "
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync "certificate\n", sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -ENOENT;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Append certificate to chain */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = x509_append ( info->chain, cert ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not append certificate: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Append remaining certificates to chain */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = x509_auto_append ( info->chain,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig->certificates ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not append certificates: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature digest algorithm
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information to fill in
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_digest_algorithm ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_algorithm *algorithm;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Identify algorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = asn1_digest_algorithm ( raw, &algorithm ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not identify digest algorithm: "
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync "%s\n", sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Record digest algorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->digest = algorithm->digest;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p digest algorithm is %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, algorithm->name );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature algorithm
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information to fill in
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_signature_algorithm ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_algorithm *algorithm;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Identify algorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = asn1_pubkey_algorithm ( raw, &algorithm ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not identify public-key "
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync "algorithm: %s\n", sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Record signature algorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->pubkey = algorithm->pubkey;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p public-key algorithm is %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, algorithm->name );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature value
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information to fill in
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_signature_value ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = asn1_enter ( &cursor, ASN1_OCTET_STRING ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not locate signature:\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, raw->data, raw->len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Record signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->signature_len = cursor.len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->signature = malloc ( info->signature_len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! info->signature )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -ENOMEM;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( info->signature, cursor.data, info->signature_len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p signature value is:\n", sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, info->signature, info->signature_len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature signer information
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information to fill in
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse_signer_info ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter signerInfo */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_SEQUENCE );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip version */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip ( &cursor, ASN1_INTEGER );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse sid */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_signer_identifier ( sig, info, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse digestAlgorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_digest_algorithm ( sig, info, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip signedAttrs, if present */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_if_exists ( &cursor, ASN1_EXPLICIT_TAG ( 0 ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse signatureAlgorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_signature_algorithm ( sig, info, &cursor ) ) != 0)
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_signature_value ( sig, info, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Parse CMS signature from ASN.1 data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v raw ASN.1 cursor
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_parse ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const struct asn1_cursor *raw ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter contentInfo */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync memcpy ( &cursor, raw, sizeof ( cursor ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_SEQUENCE );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse contentType */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_content_type ( sig, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter content */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_EXPLICIT_TAG ( 0 ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter signedData */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_SEQUENCE );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip version */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip ( &cursor, ASN1_INTEGER );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip digestAlgorithms */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip ( &cursor, ASN1_SET );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip encapContentInfo */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip ( &cursor, ASN1_SEQUENCE );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse certificates */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_certificates ( sig, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Skip crls, if present */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_if_exists ( &cursor, ASN1_EXPLICIT_TAG ( 1 ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Enter signerInfos */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_enter ( &cursor, ASN1_SET );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Add each signerInfo. Errors are handled by ensuring that
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * cms_put() will always be able to free any allocated memory.
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync while ( cursor.len ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Allocate signer information block */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info = zalloc ( sizeof ( *info ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! info )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -ENOMEM;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync list_add ( &info->list, &sig->info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Allocate certificate chain */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->chain = x509_alloc_chain();
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! info->chain )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -ENOMEM;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse signerInfo */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse_signer_info ( sig, info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_skip_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Free CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v refcnt Reference count
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic void cms_free ( struct refcnt *refcnt ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signature *sig =
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync container_of ( refcnt, struct cms_signature, refcnt );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *tmp;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync list_for_each_entry_safe ( info, tmp, &sig->info, list ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync list_del ( &info->list );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync x509_chain_put ( info->chain );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync free ( info->signature );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync free ( info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync x509_chain_put ( sig->certificates );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync free ( sig );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Create CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v data Raw signature data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v len Length of raw data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * On success, the caller holds a reference to the CMS signature, and
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * is responsible for ultimately calling cms_put().
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncint cms_signature ( const void *data, size_t len, struct cms_signature **sig ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct asn1_cursor cursor;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Allocate and initialise signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *sig = zalloc ( sizeof ( **sig ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! *sig ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync rc = -ENOMEM;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync goto err_alloc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync ref_init ( &(*sig)->refcnt, cms_free );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync INIT_LIST_HEAD ( &(*sig)->info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Allocate certificate list */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync (*sig)->certificates = x509_alloc_chain();
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! (*sig)->certificates ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync rc = -ENOMEM;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync goto err_alloc_chain;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Initialise cursor */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cursor.data = data;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cursor.len = len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync asn1_shrink_any ( &cursor );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Parse signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_parse ( *sig, &cursor ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync goto err_parse;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync err_parse:
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync err_alloc_chain:
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cms_put ( *sig );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync err_alloc:
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Calculate digest of CMS-signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v data Signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v len Length of signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v out Digest output
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic void cms_digest ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync userptr_t data, size_t len, void *out ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct digest_algorithm *digest = info->digest;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync uint8_t ctx[ digest->ctxsize ];
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync uint8_t block[ digest->blocksize ];
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync size_t offset = 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync size_t frag_len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Initialise digest */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync digest_init ( digest, ctx );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Process data one block at a time */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync while ( len ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync frag_len = len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( frag_len > sizeof ( block ) )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync frag_len = sizeof ( block );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync copy_from_user ( block, data, offset, frag_len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync digest_update ( digest, ctx, block, frag_len );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync offset += frag_len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync len -= frag_len;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Finalise digest */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync digest_final ( digest, ctx, out );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p digest value:\n", sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC_HDA ( sig, 0, out, digest->digestsize );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Verify digest of CMS-signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v cert Corresponding certificate
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v data Signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v len Length of signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_verify_digest ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync userptr_t data, size_t len ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct digest_algorithm *digest = info->digest;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct pubkey_algorithm *pubkey = info->pubkey;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_public_key *public_key = &cert->subject.public_key;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync uint8_t digest_out[ digest->digestsize ];
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync uint8_t ctx[ pubkey->ctxsize ];
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Generate digest */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cms_digest ( sig, info, data, len, digest_out );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Initialise public-key algorithm */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = pubkey_init ( pubkey, ctx, public_key->raw.data,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync public_key->raw.len ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not initialise public key: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync goto err_init;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Verify digest */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = pubkey_verify ( pubkey, ctx, digest, digest_out,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->signature,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync info->signature_len ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p signature verification failed: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync goto err_verify;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync err_verify:
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync pubkey_final ( pubkey, ctx );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync err_init:
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Verify CMS signature signer information
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v info Signer information
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v data Signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v len Length of signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v time Time at which to validate certificates
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v root Root certificate store, or NULL to use default
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncstatic int cms_verify_signer_info ( struct cms_signature *sig,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync userptr_t data, size_t len,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync time_t time, struct x509_root *root ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Validate certificate chain */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = x509_validate_chain ( info->chain, time, root ) ) != 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p could not validate chain: %s\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info, strerror ( rc ) );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Extract code-signing certificate */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cert = x509_first ( info->chain );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync assert ( cert != NULL );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Check that certificate can create digital signatures */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! ( cert->extensions.usage.bits & X509_DIGITAL_SIGNATURE ) ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p certificate cannot create signatures\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -EACCES_NON_SIGNING;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Check that certificate can sign code */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ! ( cert->extensions.ext_usage.bits & X509_CODE_SIGNING ) ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p/%p certificate is not code-signing\n",
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync sig, info );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -EACCES_NON_CODE_SIGNING;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Verify digest */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_verify_digest ( sig, info, cert, data, len ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync/**
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * Verify CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync *
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v sig CMS signature
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v data Signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v len Length of signed data
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v name Required common name, or NULL to check all signatures
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v time Time at which to validate certificates
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @v root Root certificate store, or NULL to use default
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync * @ret rc Return status code
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsyncint cms_verify ( struct cms_signature *sig, userptr_t data, size_t len,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync const char *name, time_t time, struct x509_root *root ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct cms_signer_info *info;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync struct x509_certificate *cert;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int count = 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync int rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Verify using all signerInfos */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync list_for_each_entry ( info, &sig->info, list ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync cert = x509_first ( info->chain );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( name && ( ( cert->subject.name == NULL ) ||
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync ( strcmp ( cert->subject.name, name ) != 0 ) ) )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync continue;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( ( rc = cms_verify_signer_info ( sig, info, data, len,
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync time, root ) ) != 0 )
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return rc;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync count++;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync /* Check that we have verified at least one signature */
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( count == 0 ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync if ( name ) {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p had no signatures matching name "
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync "%s\n", sig, name );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -EACCES_WRONG_NAME;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync } else {
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync DBGC ( sig, "CMS %p had no signatures\n", sig );
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return -EACCES_NO_SIGNATURES;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync }
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync return 0;
a734c64bff58bda2fa48c2795453e092167b0ff7vboxsync}