354 lines
8.0 KiB
C
354 lines
8.0 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include "brssl.h"
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#include "bearssl.h"
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static unsigned
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rsa_bit_length(const br_rsa_public_key *pk)
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{
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size_t u;
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unsigned x, bl;
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for (u = 0; u < pk->nlen; u ++) {
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if (pk->n[u] != 0) {
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break;
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}
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}
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if (u == pk->nlen) {
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return 0;
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}
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bl = (unsigned)(pk->nlen - u - 1) << 3;
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x = pk->n[u];
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while (x != 0) {
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bl ++;
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x >>= 1;
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}
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return bl;
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}
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static void
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print_rsa(const br_rsa_public_key *pk, int print_text, int print_C)
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{
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if (print_text) {
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size_t u;
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printf("n = ");
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for (u = 0; u < pk->nlen; u ++) {
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printf("%02X", pk->n[u]);
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}
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printf("\n");
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printf("e = ");
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for (u = 0; u < pk->elen; u ++) {
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printf("%02X", pk->e[u]);
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}
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printf("\n");
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}
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if (print_C) {
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size_t u;
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printf("\nstatic const unsigned char RSA_N[] = {");
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for (u = 0; u < pk->nlen; u ++) {
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if (u != 0) {
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printf(",");
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}
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if (u % 12 == 0) {
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printf("\n\t");
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} else {
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printf(" ");
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}
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printf("0x%02X", pk->n[u]);
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}
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printf("\n};\n");
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printf("\nstatic const unsigned char RSA_E[] = {");
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for (u = 0; u < pk->elen; u ++) {
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if (u != 0) {
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printf(",");
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}
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if (u % 12 == 0) {
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printf("\n\t");
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} else {
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printf(" ");
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}
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printf("0x%02X", pk->e[u]);
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}
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printf("\n};\n");
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printf("\nstatic const br_rsa_public_key RSA = {\n");
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printf("\t(unsigned char *)RSA_N, sizeof RSA_N,\n");
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printf("\t(unsigned char *)RSA_E, sizeof RSA_E\n");
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printf("};\n");
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}
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}
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static void
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print_ec(const br_ec_public_key *pk, int print_text, int print_C)
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{
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if (print_text) {
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size_t u;
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printf("Q = ");
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for (u = 0; u < pk->qlen; u ++) {
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printf("%02X", pk->q[u]);
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}
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printf("\n");
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}
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if (print_C) {
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size_t u;
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printf("\nstatic const unsigned char EC_Q[] = {");
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for (u = 0; u < pk->qlen; u ++) {
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if (u != 0) {
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printf(",");
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}
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if (u % 12 == 0) {
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printf("\n\t");
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} else {
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printf(" ");
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}
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printf("0x%02X", pk->q[u]);
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}
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printf("\n};\n");
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printf("\nstatic const br_ec_public_key EC = {\n");
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printf("\t%d,\n", pk->curve);
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printf("\t(unsigned char *)EC_Q, sizeof EC_Q\n");
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printf("};\n");
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}
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}
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static void
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usage_verify(void)
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{
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fprintf(stderr,
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"usage: brssl verify [ options ] file...\n");
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fprintf(stderr,
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"options:\n");
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fprintf(stderr,
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" -q suppress verbose messages\n");
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fprintf(stderr,
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" -sni name check presence of a specific server name\n");
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fprintf(stderr,
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" -CA file add certificates in 'file' to trust anchors\n");
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fprintf(stderr,
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" -text print public key details (human-readable)\n");
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fprintf(stderr,
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" -C print public key details (C code)\n");
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}
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typedef VECTOR(br_x509_certificate) cert_list;
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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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/* see brssl.h */
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int
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do_verify(int argc, char *argv[])
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{
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int retcode;
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int verbose;
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int i;
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const char *sni;
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anchor_list anchors = VEC_INIT;
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cert_list chain = VEC_INIT;
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size_t u;
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br_x509_minimal_context mc;
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int err;
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int print_text, print_C;
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br_x509_pkey *pk;
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const br_x509_pkey *tpk;
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unsigned usages;
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retcode = 0;
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verbose = 1;
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sni = NULL;
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print_text = 0;
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print_C = 0;
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pk = NULL;
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for (i = 0; i < argc; i ++) {
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const char *arg;
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arg = argv[i];
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if (arg[0] != '-') {
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br_x509_certificate *xcs;
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size_t num;
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xcs = read_certificates(arg, &num);
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if (xcs == NULL) {
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usage_verify();
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goto verify_exit_error;
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}
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VEC_ADDMANY(chain, xcs, num);
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xfree(xcs);
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continue;
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}
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if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
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verbose = 1;
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} else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
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verbose = 0;
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} else if (eqstr(arg, "-sni")) {
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if (++ i >= argc) {
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fprintf(stderr,
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"ERROR: no argument for '-sni'\n");
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usage_verify();
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goto verify_exit_error;
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}
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if (sni != NULL) {
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fprintf(stderr, "ERROR: duplicate SNI\n");
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usage_verify();
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goto verify_exit_error;
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}
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sni = argv[i];
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continue;
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} else if (eqstr(arg, "-CA")) {
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if (++ i >= argc) {
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fprintf(stderr,
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"ERROR: no argument for '-CA'\n");
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usage_verify();
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goto verify_exit_error;
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}
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arg = argv[i];
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if (read_trust_anchors(&anchors, arg) == 0) {
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usage_verify();
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goto verify_exit_error;
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}
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continue;
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} else if (eqstr(arg, "-text")) {
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print_text = 1;
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} else if (eqstr(arg, "-C")) {
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print_C = 1;
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} else {
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fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
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usage_verify();
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goto verify_exit_error;
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}
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}
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if (VEC_LEN(chain) == 0) {
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fprintf(stderr, "ERROR: no certificate chain provided\n");
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usage_verify();
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goto verify_exit_error;
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}
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br_x509_minimal_init(&mc, &br_sha256_vtable,
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&VEC_ELT(anchors, 0), VEC_LEN(anchors));
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br_x509_minimal_set_hash(&mc, br_sha1_ID, &br_sha1_vtable);
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br_x509_minimal_set_hash(&mc, br_sha224_ID, &br_sha224_vtable);
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br_x509_minimal_set_hash(&mc, br_sha256_ID, &br_sha256_vtable);
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br_x509_minimal_set_hash(&mc, br_sha384_ID, &br_sha384_vtable);
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br_x509_minimal_set_hash(&mc, br_sha512_ID, &br_sha512_vtable);
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br_x509_minimal_set_rsa(&mc, &br_rsa_i31_pkcs1_vrfy);
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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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mc.vtable->start_chain(&mc.vtable, sni);
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for (u = 0; u < VEC_LEN(chain); u ++) {
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br_x509_certificate *xc;
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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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}
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err = mc.vtable->end_chain(&mc.vtable);
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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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if (err == 0) {
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if (verbose) {
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int hkx;
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fprintf(stderr, "Validation success; usages:");
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hkx = 0;
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if (usages & BR_KEYTYPE_KEYX) {
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fprintf(stderr, " key exchange");
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hkx = 1;
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}
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if (usages & BR_KEYTYPE_SIGN) {
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if (hkx) {
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fprintf(stderr, ",");
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}
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fprintf(stderr, " signature");
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}
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fprintf(stderr, "\n");
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}
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} else {
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if (verbose) {
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const char *errname, *errmsg;
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fprintf(stderr, "Validation failed, err = %d", err);
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errname = find_error_name(err, &errmsg);
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if (errname != NULL) {
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fprintf(stderr, " (%s): %s\n", errname, errmsg);
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} else {
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fprintf(stderr, " (unknown)\n");
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}
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}
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retcode = -1;
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}
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if (pk != NULL) {
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switch (pk->key_type) {
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case BR_KEYTYPE_RSA:
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if (verbose) {
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fprintf(stderr, "Key type: RSA (%u bits)\n",
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rsa_bit_length(&pk->key.rsa));
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}
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print_rsa(&pk->key.rsa, print_text, print_C);
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break;
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case BR_KEYTYPE_EC:
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if (verbose) {
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fprintf(stderr, "Key type: EC (%s)\n",
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ec_curve_name(pk->key.ec.curve));
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}
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print_ec(&pk->key.ec, print_text, print_C);
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break;
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default:
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if (verbose) {
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fprintf(stderr, "Unknown key type\n");
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break;
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}
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}
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}
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/*
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* Release allocated structures.
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*/
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verify_exit:
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VEC_CLEAREXT(anchors, &free_ta_contents);
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VEC_CLEAREXT(chain, &free_cert_contents);
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xfreepkey(pk);
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return retcode;
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verify_exit_error:
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retcode = -1;
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goto verify_exit;
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}
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