Used by loader and veriexec Depends on libbearssl Reviewed by: emaste Sponsored by: Juniper Networks Differential Revision: D16335
701 lines
15 KiB
C
701 lines
15 KiB
C
/*-
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* Copyright (c) 2017-2018, Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/**
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* @file vets.c - trust store
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* @brief verify signatures
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*
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* We leverage code from BearSSL www.bearssl.org
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*/
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#include <sys/time.h>
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#include <stdarg.h>
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#define NEED_BRSSL_H
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#include "libsecureboot-priv.h"
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#include <brssl.h>
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#include <ta.h>
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#ifndef TRUST_ANCHOR_STR
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# define TRUST_ANCHOR_STR ta_PEM
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#endif
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#define SECONDS_PER_DAY 86400
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#define X509_DAYS_TO_UTC0 719528
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int DebugVe = 0;
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typedef VECTOR(br_x509_certificate) cert_list;
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static anchor_list trust_anchors = VEC_INIT;
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void
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ve_debug_set(int n)
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{
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DebugVe = n;
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}
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static char ebuf[512];
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char *
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ve_error_get(void)
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{
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return (ebuf);
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}
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int
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ve_error_set(const char *fmt, ...)
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{
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int rc;
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va_list ap;
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va_start(ap, fmt);
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ebuf[0] = '\0';
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rc = 0;
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if (fmt) {
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#ifdef STAND_H
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vsprintf(ebuf, fmt, ap); /* no vsnprintf in libstand */
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ebuf[sizeof(ebuf) - 1] = '\0';
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rc = strlen(ebuf);
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#else
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rc = vsnprintf(ebuf, sizeof(ebuf), fmt, ap);
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#endif
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}
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va_end(ap);
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return (rc);
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}
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/* this is the time we use for verifying certs */
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static time_t ve_utc = 0;
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/**
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* @brief
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* set ve_utc used for certificate verification
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*
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* @param[in] utc
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* time - ignored unless greater than current value.
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*/
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void
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ve_utc_set(time_t utc)
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{
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if (utc > ve_utc) {
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DEBUG_PRINTF(2, ("Set ve_utc=%jd\n", (intmax_t)utc));
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ve_utc = utc;
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}
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}
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static void
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free_cert_contents(br_x509_certificate *xc)
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{
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xfree(xc->data);
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}
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/**
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* @brief
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* add certs to our trust store
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*/
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size_t
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ve_trust_anchors_add(br_x509_certificate *xcs, size_t num)
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{
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br_x509_trust_anchor ta;
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size_t u;
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for (u = 0; u < num; u++) {
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if (certificate_to_trust_anchor_inner(&ta, &xcs[u]) < 0) {
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break;
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}
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VEC_ADD(trust_anchors, ta);
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}
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return (u);
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}
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/**
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* @brief
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* initialize our trust_anchors from ta_PEM
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*/
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int
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ve_trust_init(void)
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{
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br_x509_certificate *xcs;
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static int once = -1;
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size_t num;
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if (once >= 0)
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return (once);
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once = 0;
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ve_utc_set(time(NULL));
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#ifdef BUILD_UTC
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ve_utc_set(BUILD_UTC); /* just in case */
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#endif
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ve_error_set(NULL); /* make sure it is empty */
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#ifdef VE_PCR_SUPPORT
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ve_pcr_init();
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#endif
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#ifdef TRUST_ANCHOR_STR
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xcs = parse_certificates(__DECONST(unsigned char *, TRUST_ANCHOR_STR),
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sizeof(TRUST_ANCHOR_STR), &num);
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if (xcs == NULL)
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return (0);
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num = ve_trust_anchors_add(xcs, num);
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once = (int) num;
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#else
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num = 0;
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#endif
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return (num);
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}
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/**
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* if we can verify the certificate chain in "certs",
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* return the public key and if "xcp" is !NULL the associated
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* certificate
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*/
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static br_x509_pkey *
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verify_signer_xcs(br_x509_certificate *xcs,
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size_t num,
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br_name_element *elts, size_t num_elts)
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{
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br_x509_minimal_context mc;
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br_x509_certificate *xc;
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size_t u;
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cert_list chain = VEC_INIT;
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const br_x509_pkey *tpk;
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br_x509_pkey *pk;
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unsigned int usages;
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int err;
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DEBUG_PRINTF(5, ("verify_signer: %zu certs in chain\n", num));
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VEC_ADDMANY(chain, xcs, num);
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if (VEC_LEN(chain) == 0) {
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ve_error_set("ERROR: no/invalid certificate chain\n");
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return (NULL);
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}
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DEBUG_PRINTF(5, ("verify_signer: %zu trust anchors\n",
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VEC_LEN(trust_anchors)));
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br_x509_minimal_init(&mc, &br_sha256_vtable,
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&VEC_ELT(trust_anchors, 0),
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VEC_LEN(trust_anchors));
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#ifdef VE_ECDSA_SUPPORT
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br_x509_minimal_set_ecdsa(&mc,
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&br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
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#endif
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#ifdef VE_RSA_SUPPORT
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br_x509_minimal_set_rsa(&mc, &br_rsa_i31_pkcs1_vrfy);
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#endif
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#if defined(UNIT_TEST) && defined(VE_DEPRECATED_RSA_SHA1_SUPPORT)
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/* This is deprecated! do not enable unless you absoultely have to */
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br_x509_minimal_set_hash(&mc, br_sha1_ID, &br_sha1_vtable);
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#endif
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br_x509_minimal_set_hash(&mc, br_sha256_ID, &br_sha256_vtable);
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#ifdef VE_SHA384_SUPPORT
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br_x509_minimal_set_hash(&mc, br_sha384_ID, &br_sha384_vtable);
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#endif
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#ifdef VE_SHA512_SUPPORT
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br_x509_minimal_set_hash(&mc, br_sha512_ID, &br_sha512_vtable);
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#endif
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br_x509_minimal_set_name_elements(&mc, elts, num_elts);
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#ifdef _STANDALONE
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/*
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* Clock is probably bogus so we use ve_utc.
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*/
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mc.days = (ve_utc / SECONDS_PER_DAY) + X509_DAYS_TO_UTC0;
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mc.seconds = (ve_utc % SECONDS_PER_DAY);
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#endif
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mc.vtable->start_chain(&mc.vtable, NULL);
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for (u = 0; u < VEC_LEN(chain); u ++) {
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xc = &VEC_ELT(chain, u);
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mc.vtable->start_cert(&mc.vtable, xc->data_len);
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mc.vtable->append(&mc.vtable, xc->data, xc->data_len);
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mc.vtable->end_cert(&mc.vtable);
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switch (mc.err) {
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case 0:
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case BR_ERR_X509_OK:
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case BR_ERR_X509_EXPIRED:
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break;
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default:
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printf("u=%zu mc.err=%d\n", u, mc.err);
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break;
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}
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}
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err = mc.vtable->end_chain(&mc.vtable);
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pk = NULL;
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if (err) {
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ve_error_set("Validation failed, err = %d", err);
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} else {
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tpk = mc.vtable->get_pkey(&mc.vtable, &usages);
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if (tpk != NULL) {
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pk = xpkeydup(tpk);
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}
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}
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VEC_CLEAREXT(chain, &free_cert_contents);
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return (pk);
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}
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static br_x509_pkey *
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verify_signer(const char *certs,
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br_name_element *elts, size_t num_elts)
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{
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br_x509_certificate *xcs;
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br_x509_pkey *pk;
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size_t num;
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ve_trust_init();
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xcs = read_certificates(certs, &num);
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if (xcs == NULL) {
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ve_error_set("cannot read certificates\n");
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return (NULL);
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}
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pk = verify_signer_xcs(xcs, num, elts, num_elts);
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xfree(xcs);
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return (pk);
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}
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/**
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* we need a hex digest including trailing newline below
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*/
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char *
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hexdigest(char *buf, size_t bufsz, unsigned char *foo, size_t foo_len)
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{
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char const hex2ascii[] = "0123456789abcdef";
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size_t i;
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/* every binary byte is 2 chars in hex + newline + null */
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if (bufsz < (2 * foo_len) + 2)
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return (NULL);
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for (i = 0; i < foo_len; i++) {
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buf[i * 2] = hex2ascii[foo[i] >> 4];
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buf[i * 2 + 1] = hex2ascii[foo[i] & 0x0f];
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}
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buf[i * 2] = 0x0A; /* we also want a newline */
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buf[i * 2 + 1] = '\0';
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return (buf);
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}
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/**
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* @brief
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* verify file against sigfile using pk
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*
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* When we generated the signature in sigfile,
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* we hashed (sha256) file, and sent that to signing server
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* which hashed (sha256) that hash.
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*
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* To verify we need to replicate that result.
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*
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* @param[in] pk
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* br_x509_pkey
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*
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* @paramp[in] file
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* file to be verified
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*
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* @param[in] sigfile
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* signature (PEM encoded)
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*
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* @return NULL on error, otherwise content of file.
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*/
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#ifdef VE_ECDSA_SUPPORT
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static unsigned char *
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verify_ec(br_x509_pkey *pk, const char *file, const char *sigfile)
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{
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char hexbuf[br_sha512_SIZE * 2 + 2];
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unsigned char rhbuf[br_sha512_SIZE];
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char *hex;
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br_sha256_context ctx;
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unsigned char *fcp, *scp;
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size_t flen, slen, plen;
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pem_object *po;
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const br_ec_impl *ec;
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br_ecdsa_vrfy vrfy;
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if ((fcp = read_file(file, &flen)) == NULL)
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return (NULL);
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if ((scp = read_file(sigfile, &slen)) == NULL) {
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free(fcp);
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return (NULL);
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}
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if ((po = decode_pem(scp, slen, &plen)) == NULL) {
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free(fcp);
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free(scp);
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return (NULL);
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}
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br_sha256_init(&ctx);
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br_sha256_update(&ctx, fcp, flen);
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br_sha256_out(&ctx, rhbuf);
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hex = hexdigest(hexbuf, sizeof(hexbuf), rhbuf, br_sha256_SIZE);
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/* now hash that */
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if (hex) {
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br_sha256_init(&ctx);
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br_sha256_update(&ctx, hex, strlen(hex));
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br_sha256_out(&ctx, rhbuf);
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}
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ec = br_ec_get_default();
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vrfy = br_ecdsa_vrfy_asn1_get_default();
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if (!vrfy(ec, rhbuf, br_sha256_SIZE, &pk->key.ec, po->data,
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po->data_len)) {
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free(fcp);
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fcp = NULL;
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}
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free(scp);
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return (fcp);
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}
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#endif
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#if defined(VE_RSA_SUPPORT) || defined(VE_OPENPGP_SUPPORT)
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/**
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* @brief verify an rsa digest
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*
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* @return 0 on failure
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*/
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int
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verify_rsa_digest (br_rsa_public_key *pkey,
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const unsigned char *hash_oid,
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unsigned char *mdata, size_t mlen,
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unsigned char *sdata, size_t slen)
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{
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br_rsa_pkcs1_vrfy vrfy;
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unsigned char vhbuf[br_sha512_SIZE];
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vrfy = br_rsa_pkcs1_vrfy_get_default();
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if (!vrfy(sdata, slen, hash_oid, mlen, pkey, vhbuf) ||
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memcmp(vhbuf, mdata, mlen) != 0) {
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return (0); /* fail */
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}
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return (1); /* ok */
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}
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#endif
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/**
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* @brief
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* verify file against sigfile using pk
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*
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* When we generated the signature in sigfile,
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* we hashed (sha256) file, and sent that to signing server
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* which hashed (sha256) that hash.
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*
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* Or (deprecated) we simply used sha1 hash directly.
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*
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* To verify we need to replicate that result.
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*
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* @param[in] pk
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* br_x509_pkey
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*
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* @paramp[in] file
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* file to be verified
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*
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* @param[in] sigfile
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* signature (PEM encoded)
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*
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* @return NULL on error, otherwise content of file.
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*/
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#ifdef VE_RSA_SUPPORT
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static unsigned char *
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verify_rsa(br_x509_pkey *pk, const char *file, const char *sigfile)
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{
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unsigned char rhbuf[br_sha512_SIZE];
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const unsigned char *hash_oid;
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const br_hash_class *md;
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br_hash_compat_context mctx;
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unsigned char *fcp, *scp;
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size_t flen, slen, plen, hlen;
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pem_object *po;
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if ((fcp = read_file(file, &flen)) == NULL)
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return (NULL);
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if ((scp = read_file(sigfile, &slen)) == NULL) {
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free(fcp);
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return (NULL);
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}
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if ((po = decode_pem(scp, slen, &plen)) == NULL) {
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free(fcp);
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free(scp);
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return (NULL);
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}
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switch (po->data_len) {
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#if defined(UNIT_TEST) && defined(VE_DEPRECATED_RSA_SHA1_SUPPORT)
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case 256:
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// this is our old deprecated sig method
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md = &br_sha1_vtable;
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hlen = br_sha1_SIZE;
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hash_oid = BR_HASH_OID_SHA1;
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break;
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#endif
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default:
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md = &br_sha256_vtable;
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hlen = br_sha256_SIZE;
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hash_oid = BR_HASH_OID_SHA256;
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break;
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}
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md->init(&mctx.vtable);
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md->update(&mctx.vtable, fcp, flen);
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md->out(&mctx.vtable, rhbuf);
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if (!verify_rsa_digest(&pk->key.rsa, hash_oid,
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rhbuf, hlen, po->data, po->data_len)) {
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free(fcp);
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fcp = NULL;
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}
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free(scp);
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return (fcp);
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}
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#endif
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/**
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* @brief
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* verify a signature and return content of signed file
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*
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* @param[in] sigfile
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* file containing signature
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* we derrive path of signed file and certificate change from
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* this.
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*
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* @param[in] flags
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* only bit 1 significant so far
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*
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* @return NULL on error otherwise content of signed file
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*/
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unsigned char *
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verify_sig(const char *sigfile, int flags)
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{
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br_x509_pkey *pk;
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br_name_element cn;
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char cn_buf[80];
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unsigned char cn_oid[4];
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char pbuf[MAXPATHLEN];
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char *cp;
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unsigned char *ucp;
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size_t n;
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DEBUG_PRINTF(5, ("verify_sig: %s\n", sigfile));
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n = strlcpy(pbuf, sigfile, sizeof(pbuf));
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if (n > (sizeof(pbuf) - 5) || strcmp(&sigfile[n - 3], "sig") != 0)
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return (NULL);
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cp = strcpy(&pbuf[n - 3], "certs");
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/*
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* We want the commonName field
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* the OID we want is 2,5,4,3 - but DER encoded
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*/
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cn_oid[0] = 3;
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cn_oid[1] = 0x55;
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cn_oid[2] = 4;
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cn_oid[3] = 3;
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cn.oid = cn_oid;
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cn.buf = cn_buf;
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cn.len = sizeof(cn_buf);
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pk = verify_signer(pbuf, &cn, 1);
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if (!pk) {
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printf("cannot verify: %s: %s\n", pbuf, ve_error_get());
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|
return (NULL);
|
|
}
|
|
for (; cp > pbuf; cp--) {
|
|
if (*cp == '.') {
|
|
*cp = '\0';
|
|
break;
|
|
}
|
|
}
|
|
switch (pk->key_type) {
|
|
#ifdef VE_ECDSA_SUPPORT
|
|
case BR_KEYTYPE_EC:
|
|
ucp = verify_ec(pk, pbuf, sigfile);
|
|
break;
|
|
#endif
|
|
#ifdef VE_RSA_SUPPORT
|
|
case BR_KEYTYPE_RSA:
|
|
ucp = verify_rsa(pk, pbuf, sigfile);
|
|
break;
|
|
#endif
|
|
default:
|
|
ucp = NULL; /* not supported */
|
|
}
|
|
xfreepkey(pk);
|
|
if (!ucp) {
|
|
printf("Unverified %s (%s)\n", pbuf,
|
|
cn.status ? cn_buf : "unknown");
|
|
} else if ((flags & 1) != 0) {
|
|
printf("Verified %s signed by %s\n", pbuf,
|
|
cn.status ? cn_buf : "someone we trust");
|
|
}
|
|
return (ucp);
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief verify hash matches
|
|
*
|
|
* We have finished hashing a file,
|
|
* see if we got the desired result.
|
|
*
|
|
* @param[in] ctx
|
|
* pointer to hash context
|
|
*
|
|
* @param[in] md
|
|
* pointer to hash class
|
|
*
|
|
* @param[in] path
|
|
* name of the file we are checking
|
|
*
|
|
* @param[in] want
|
|
* the expected result
|
|
*
|
|
* @param[in] hlen
|
|
* size of hash output
|
|
*
|
|
* @return 0 on success
|
|
*/
|
|
int
|
|
ve_check_hash(br_hash_compat_context *ctx, const br_hash_class *md,
|
|
const char *path, const char *want, size_t hlen)
|
|
{
|
|
char hexbuf[br_sha512_SIZE * 2 + 2];
|
|
unsigned char hbuf[br_sha512_SIZE];
|
|
char *hex;
|
|
int rc;
|
|
int n;
|
|
|
|
md->out(&ctx->vtable, hbuf);
|
|
#ifdef VE_PCR_SUPPORT
|
|
ve_pcr_update(hbuf, hlen);
|
|
#endif
|
|
hex = hexdigest(hexbuf, sizeof(hexbuf), hbuf, hlen);
|
|
if (!hex)
|
|
return (VE_FINGERPRINT_WRONG);
|
|
n = 2*hlen;
|
|
if ((rc = strncmp(hex, want, n))) {
|
|
ve_error_set("%s: %.*s != %.*s", path, n, hex, n, want);
|
|
rc = VE_FINGERPRINT_WRONG;
|
|
}
|
|
return (rc ? rc : VE_FINGERPRINT_OK);
|
|
}
|
|
|
|
#ifdef VE_HASH_KAT_STR
|
|
static int
|
|
test_hash(const br_hash_class *md, size_t hlen,
|
|
const char *hname, const char *s, size_t slen, const char *want)
|
|
{
|
|
br_hash_compat_context mctx;
|
|
|
|
md->init(&mctx.vtable);
|
|
md->update(&mctx.vtable, s, slen);
|
|
return (ve_check_hash(&mctx, md, hname, want, hlen) != VE_FINGERPRINT_OK);
|
|
}
|
|
|
|
#endif
|
|
|
|
#define ve_test_hash(n, N) \
|
|
printf("Testing hash: " #n "\t\t\t\t%s\n", \
|
|
test_hash(&br_ ## n ## _vtable, br_ ## n ## _SIZE, #n, \
|
|
VE_HASH_KAT_STR, sizeof(VE_HASH_KAT_STR), \
|
|
vh_ ## N) ? "Failed" : "Passed")
|
|
|
|
/**
|
|
* @brief
|
|
* run self tests on hash and signature verification
|
|
*
|
|
* Test that the hash methods (SHA1 and SHA256) work.
|
|
* Test that we can verify a certificate for each supported
|
|
* Root CA.
|
|
*
|
|
* @return cached result.
|
|
*/
|
|
int
|
|
ve_self_tests(void)
|
|
{
|
|
static int once = -1;
|
|
#ifdef VERIFY_CERTS_STR
|
|
br_x509_certificate *xcs;
|
|
br_x509_pkey *pk;
|
|
br_name_element cn;
|
|
char cn_buf[80];
|
|
unsigned char cn_oid[4];
|
|
size_t num;
|
|
size_t u;
|
|
#endif
|
|
|
|
if (once >= 0)
|
|
return (once);
|
|
once = 0;
|
|
|
|
DEBUG_PRINTF(5, ("Self tests...\n"));
|
|
#ifdef VE_HASH_KAT_STR
|
|
#ifdef VE_SHA1_SUPPORT
|
|
ve_test_hash(sha1, SHA1);
|
|
#endif
|
|
#ifdef VE_SHA256_SUPPORT
|
|
ve_test_hash(sha256, SHA256);
|
|
#endif
|
|
#ifdef VE_SHA384_SUPPORT
|
|
ve_test_hash(sha384, SHA384);
|
|
#endif
|
|
#ifdef VE_SHA512_SUPPORT
|
|
ve_test_hash(sha512, SHA512);
|
|
#endif
|
|
#endif
|
|
#ifdef VERIFY_CERTS_STR
|
|
xcs = parse_certificates(__DECONST(unsigned char *, VERIFY_CERTS_STR),
|
|
sizeof(VERIFY_CERTS_STR), &num);
|
|
if (xcs == NULL)
|
|
return (0);
|
|
/*
|
|
* We want the commonName field
|
|
* the OID we want is 2,5,4,3 - but DER encoded
|
|
*/
|
|
cn_oid[0] = 3;
|
|
cn_oid[1] = 0x55;
|
|
cn_oid[2] = 4;
|
|
cn_oid[3] = 3;
|
|
cn.oid = cn_oid;
|
|
cn.buf = cn_buf;
|
|
|
|
for (u = 0; u < num; u ++) {
|
|
cn.len = sizeof(cn_buf);
|
|
if ((pk = verify_signer_xcs(&xcs[u], 1, &cn, 1)) != NULL) {
|
|
once++;
|
|
printf("Testing verify certificate: %s\tPassed\n",
|
|
cn.status ? cn_buf : "");
|
|
xfreepkey(pk);
|
|
}
|
|
}
|
|
if (!once)
|
|
printf("Testing verify certificate:\t\t\tFailed\n");
|
|
xfree(xcs);
|
|
#else
|
|
printf("No X.509 self tests\n");
|
|
#endif /* VERIFY_CERTS_STR */
|
|
#ifdef VE_OPENPGP_SUPPORT
|
|
if (!openpgp_self_tests())
|
|
once++;
|
|
#endif
|
|
return (once);
|
|
}
|